diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-20 03:48:12 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-20 03:48:12 +0300 |
| commit | 78975f23cba0cd195db01cdbd6eb48138a655890 (patch) | |
| tree | 0e808c0cfe220bd8fb00d66985d71655345904cb | |
| parent | feaa7cb5c59416143432829b15826be76605b8fe (diff) | |
| parent | 73e8b0528346e88a0624f2d9821f382cd6256677 (diff) | |
| download | linux-78975f23cba0cd195db01cdbd6eb48138a655890.tar.xz | |
Merge branch 'i2c/for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:
- Peter Rosin did some major rework on the locking of i2c muxes by
seperating parent-locked muxes and mux-locked muxes.
This avoids deadlocks/workarounds when the mux itself needs i2c
commands for muxing. And as a side-effect, other workarounds in the
media layer could be eliminated. Also, Peter stepped up as the i2c
mux maintainer and will keep an eye on these changes.
- major updates to the octeon driver
- add a helper to the core to generate the address+rw_bit octal and
make drivers use it
- quite a bunch of driver updates
* 'i2c/for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (84 commits)
i2c: rcar: add DMA support
i2c: st: Implement bus clear
i2c: only check scl functions when using generic recovery
i2c: algo-bit: declare i2c_bit_quirk_no_clk_stretch as static
i2c: tegra: disable clock before returning error
[media] rtl2832: regmap is aware of lockdep, drop local locking hack
[media] rtl2832_sdr: get rid of empty regmap wrappers
[media] rtl2832: change the i2c gate to be mux-locked
[media] si2168: change the i2c gate to be mux-locked
iio: imu: inv_mpu6050: change the i2c gate to be mux-locked
i2c: mux: document i2c muxes and elaborate on parent-/mux-locked muxes
i2c: mux: relax locking of the top i2c adapter during mux-locked muxing
i2c: muxes always lock the parent adapter
i2c: allow adapter drivers to override the adapter locking
i2c: uniphier: add "\n" at the end of error log
i2c: mv64xxx: remove CONFIG_HAVE_CLK conditionals
i2c: mv64xxx: use clk_{prepare_enable,disable_unprepare}
i2c: mv64xxx: handle probe deferral for the clock
i2c: mv64xxx: enable the driver on ARCH_MVEBU
i2c: octeon: Add workaround for broken irqs on CN3860
...
67 files changed, 2648 insertions, 1445 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-octeon.txt b/Documentation/devicetree/bindings/i2c/i2c-octeon.txt index dced82ebe31d..872d485dffab 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-octeon.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-octeon.txt @@ -4,6 +4,12 @@ Compatibility with all cn3XXX, cn5XXX and cn6XXX SOCs. + or + + compatible: "cavium,octeon-7890-twsi" + + Compatibility with cn78XX SOCs. + - reg: The base address of the TWSI/I2C bus controller register bank. - #address-cells: Must be <1>. diff --git a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt index cf8bfc956cdc..5f0cb502b1db 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt @@ -19,6 +19,9 @@ Optional properties: - clock-frequency: desired I2C bus clock frequency in Hz. The absence of this property indicates the default frequency 100 kHz. - clocks: clock specifier. +- dmas: Must contain a list of two references to DMA specifiers, one for + transmission, and one for reception. +- dma-names: Must contain a list of two DMA names, "tx" and "rx". - i2c-scl-falling-time-ns: see i2c.txt - i2c-scl-internal-delay-ns: see i2c.txt diff --git a/Documentation/i2c/i2c-topology b/Documentation/i2c/i2c-topology new file mode 100644 index 000000000000..e0aefeece551 --- /dev/null +++ b/Documentation/i2c/i2c-topology @@ -0,0 +1,370 @@ +I2C topology +============ + +There are a couple of reasons for building more complex i2c topologies +than a straight-forward i2c bus with one adapter and one or more devices. + +1. A mux may be needed on the bus to prevent address collisions. + +2. The bus may be accessible from some external bus master, and arbitration + may be needed to determine if it is ok to access the bus. + +3. A device (particularly RF tuners) may want to avoid the digital noise + from the i2c bus, at least most of the time, and sits behind a gate + that has to be operated before the device can be accessed. + +Etc + +These constructs are represented as i2c adapter trees by Linux, where +each adapter has a parent adapter (except the root adapter) and zero or +more child adapters. The root adapter is the actual adapter that issues +i2c transfers, and all adapters with a parent are part of an "i2c-mux" +object (quoted, since it can also be an arbitrator or a gate). + +Depending of the particular mux driver, something happens when there is +an i2c transfer on one of its child adapters. The mux driver can +obviously operate a mux, but it can also do arbitration with an external +bus master or open a gate. The mux driver has two operations for this, +select and deselect. select is called before the transfer and (the +optional) deselect is called after the transfer. + + +Locking +======= + +There are two variants of locking available to i2c muxes, they can be +mux-locked or parent-locked muxes. As is evident from below, it can be +useful to know if a mux is mux-locked or if it is parent-locked. The +following list was correct at the time of writing: + +In drivers/i2c/muxes/ +i2c-arb-gpio-challenge Parent-locked +i2c-mux-gpio Normally parent-locked, mux-locked iff + all involved gpio pins are controlled by the + same i2c root adapter that they mux. +i2c-mux-pca9541 Parent-locked +i2c-mux-pca954x Parent-locked +i2c-mux-pinctrl Normally parent-locked, mux-locked iff + all involved pinctrl devices are controlled + by the same i2c root adapter that they mux. +i2c-mux-reg Parent-locked + +In drivers/iio/ +imu/inv_mpu6050/ Mux-locked + +In drivers/media/ +dvb-frontends/m88ds3103 Parent-locked +dvb-frontends/rtl2830 Parent-locked +dvb-frontends/rtl2832 Mux-locked +dvb-frontends/si2168 Mux-locked +usb/cx231xx/ Parent-locked + + +Mux-locked muxes +---------------- + +Mux-locked muxes does not lock the entire parent adapter during the +full select-transfer-deselect transaction, only the muxes on the parent +adapter are locked. Mux-locked muxes are mostly interesting if the +select and/or deselect operations must use i2c transfers to complete +their tasks. Since the parent adapter is not fully locked during the +full transaction, unrelated i2c transfers may interleave the different +stages of the transaction. This has the benefit that the mux driver +may be easier and cleaner to implement, but it has some caveats. + +ML1. If you build a topology with a mux-locked mux being the parent + of a parent-locked mux, this might break the expectation from the + parent-locked mux that the root adapter is locked during the + transaction. + +ML2. It is not safe to build arbitrary topologies with two (or more) + mux-locked muxes that are not siblings, when there are address + collisions between the devices on the child adapters of these + non-sibling muxes. + + I.e. the select-transfer-deselect transaction targeting e.g. device + address 0x42 behind mux-one may be interleaved with a similar + operation targeting device address 0x42 behind mux-two. The + intension with such a topology would in this hypothetical example + be that mux-one and mux-two should not be selected simultaneously, + but mux-locked muxes do not guarantee that in all topologies. + +ML3. A mux-locked mux cannot be used by a driver for auto-closing + gates/muxes, i.e. something that closes automatically after a given + number (one, in most cases) of i2c transfers. Unrelated i2c transfers + may creep in and close prematurely. + +ML4. If any non-i2c operation in the mux driver changes the i2c mux state, + the driver has to lock the root adapter during that operation. + Otherwise garbage may appear on the bus as seen from devices + behind the mux, when an unrelated i2c transfer is in flight during + the non-i2c mux-changing operation. + + +Mux-locked Example +------------------ + + .----------. .--------. + .--------. | mux- |-----| dev D1 | + | root |--+--| locked | '--------' + '--------' | | mux M1 |--. .--------. + | '----------' '--| dev D2 | + | .--------. '--------' + '--| dev D3 | + '--------' + +When there is an access to D1, this happens: + + 1. Someone issues an i2c-transfer to D1. + 2. M1 locks muxes on its parent (the root adapter in this case). + 3. M1 calls ->select to ready the mux. + 4. M1 (presumably) does some i2c-transfers as part of its select. + These transfers are normal i2c-transfers that locks the parent + adapter. + 5. M1 feeds the i2c-transfer from step 1 to its parent adapter as a + normal i2c-transfer that locks the parent adapter. + 6. M1 calls ->deselect, if it has one. + 7. Same rules as in step 4, but for ->deselect. + 8. M1 unlocks muxes on its parent. + +This means that accesses to D2 are lockout out for the full duration +of the entire operation. But accesses to D3 are possibly interleaved +at any point. + + +Parent-locked muxes +------------------- + +Parent-locked muxes lock the parent adapter during the full select- +transfer-deselect transaction. The implication is that the mux driver +has to ensure that any and all i2c transfers through that parent +adapter during the transaction are unlocked i2c transfers (using e.g. +__i2c_transfer), or a deadlock will follow. There are a couple of +caveats. + +PL1. If you build a topology with a parent-locked mux being the child + of another mux, this might break a possible assumption from the + child mux that the root adapter is unused between its select op + and the actual transfer (e.g. if the child mux is auto-closing + and the parent mux issus i2c-transfers as part of its select). + This is especially the case if the parent mux is mux-locked, but + it may also happen if the parent mux is parent-locked. + +PL2. If select/deselect calls out to other subsystems such as gpio, + pinctrl, regmap or iio, it is essential that any i2c transfers + caused by these subsystems are unlocked. This can be convoluted to + accomplish, maybe even impossible if an acceptably clean solution + is sought. + + +Parent-locked Example +--------------------- + + .----------. .--------. + .--------. | parent- |-----| dev D1 | + | root |--+--| locked | '--------' + '--------' | | mux M1 |--. .--------. + | '----------' '--| dev D2 | + | .--------. '--------' + '--| dev D3 | + '--------' + +When there is an access to D1, this happens: + + 1. Someone issues an i2c-transfer to D1. + 2. M1 locks muxes on its parent (the root adapter in this case). + 3. M1 locks its parent adapter. + 4. M1 calls ->select to ready the mux. + 5. If M1 does any i2c-transfers (on this root adapter) as part of + its select, those transfers must be unlocked i2c-transfers so + that they do not deadlock the root adapter. + 6. M1 feeds the i2c-transfer from step 1 to the root adapter as an + unlocked i2c-transfer, so that it does not deadlock the parent + adapter. + 7. M1 calls ->deselect, if it has one. + 8. Same rules as in step 5, but for ->deselect. + 9. M1 unlocks its parent adapter. +10. M1 unlocks muxes on its parent. + + +This means that accesses to both D2 and D3 are locked out for the full +duration of the entire operation. + + +Complex Examples +================ + +Parent-locked mux as parent of parent-locked mux +------------------------------------------------ + +This is a useful topology, but it can be bad. + + .----------. .----------. .--------. + .--------. | parent- |-----| parent- |-----| dev D1 | + | root |--+--| locked | | locked | '--------' + '--------' | | mux M1 |--. | mux M2 |--. .--------. + | '----------' | '----------' '--| dev D2 | + | .--------. | .--------. '--------' + '--| dev D4 | '--| dev D3 | + '--------' '--------' + +When any device is accessed, all other devices are locked out for +the full duration of the operation (both muxes lock their parent, +and specifically when M2 requests its parent to lock, M1 passes +the buck to the root adapter). + +This topology is bad if M2 is an auto-closing mux and M1->select +issues any unlocked i2c transfers on the root adapter that may leak +through and be seen by the M2 adapter, thus closing M2 prematurely. + + +Mux-locked mux as parent of mux-locked mux +------------------------------------------ + +This is a good topology. + + .----------. .----------. .--------. + .--------. | mux- |-----| mux- |-----| dev D1 | + | root |--+--| locked | | locked | '--------' + '--------' | | mux M1 |--. | mux M2 |--. .--------. + | '----------' | '----------' '--| dev D2 | + | .--------. | .--------. '--------' + '--| dev D4 | '--| dev D3 | + '--------' '--------' + +When device D1 is accessed, accesses to D2 are locked out for the +full duration of the operation (muxes on the top child adapter of M1 +are locked). But accesses to D3 and D4 are possibly interleaved at +any point. Accesses to D3 locks out D1 and D2, but accesses to D4 +are still possibly interleaved. + + +Mux-locked mux as parent of parent-locked mux +--------------------------------------------- + +This is probably a bad topology. + + .----------. .----------. .--------. + .--------. | mux- |-----| parent- |-----| dev D1 | + | root |--+--| locked | | locked | '--------' + '--------' | | mux M1 |--. | mux M2 |--. .--------. + | '----------' | '----------' '--| dev D2 | + | .--------. | .--------. '--------' + '--| dev D4 | '--| dev D3 | + '--------' '--------' + +When device D1 is accessed, accesses to D2 and D3 are locked out +for the full duration of the operation (M1 locks child muxes on the +root adapter). But accesses to D4 are possibly interleaved at any +point. + +This kind of topology is generally not suitable and should probably +be avoided. The reason is that M2 probably assumes that there will +be no i2c transfers during its calls to ->select and ->deselect, and +if there are, any such transfers might appear on the slave side of M2 +as partial i2c transfers, i.e. garbage or worse. This might cause +device lockups and/or other problems. + +The topology is especially troublesome if M2 is an auto-closing +mux. In that case, any interleaved accesses to D4 might close M2 +prematurely, as might any i2c-transfers part of M1->select. + +But if M2 is not making the above stated assumption, and if M2 is not +auto-closing, the topology is fine. + + +Parent-locked mux as parent of mux-locked mux +--------------------------------------------- + +This is a good topology. + + .----------. .----------. .--------. + .--------. | parent- |-----| mux- |-----| dev D1 | + | root |--+--| locked | | locked | '--------' + '--------' | | mux M1 |--. | mux M2 |--. .--------. + | '----------' | '----------' '--| dev D2 | + | .--------. | .--------. '--------' + '--| dev D4 | '--| dev D3 | + '--------' '--------' + +When D1 is accessed, accesses to D2 are locked out for the full +duration of the operation (muxes on the top child adapter of M1 +are locked). Accesses to D3 and D4 are possibly interleaved at +any point, just as is expected for mux-locked muxes. + +When D3 or D4 are accessed, everything else is locked out. For D3 +accesses, M1 locks the root adapter. For D4 accesses, the root +adapter is locked directly. + + +Two mux-locked sibling muxes +---------------------------- + +This is a good topology. + + .--------. + .----------. .--| dev D1 | + | mux- |--' '--------' + .--| locked | .--------. + | | mux M1 |-----| dev D2 | + | '----------' '--------' + | .----------. .--------. + .--------. | | mux- |-----| dev D3 | + | root |--+--| locked | '--------' + '--------' | | mux M2 |--. .--------. + | '----------' '--| dev D4 | + | .--------. '--------' + '--| dev D5 | + '--------' + +When D1 is accessed, accesses to D2, D3 and D4 are locked out. But +accesses to D5 may be interleaved at any time. + + +Two parent-locked sibling muxes +------------------------------- + +This is a good topology. + + .--------. + .----------. .--| dev D1 | + | parent- |--' '--------' + .--| locked | .--------. + | | mux M1 |-----| dev D2 | + | '----------' '--------' + | .----------. .--------. + .--------. | | parent- |-----| dev D3 | + | root |--+--| locked | '--------' + '--------' | | mux M2 |--. .--------. + | '----------' '--| dev D4 | + | .--------. '--------' + '--| dev D5 | + '--------' + +When any device is accessed, accesses to all other devices are locked +out. + + +Mux-locked and parent-locked sibling muxes +------------------------------------------ + +This is a good topology. + + .--------. + .----------. .--| dev D1 | + | mux- |--' '--------' + .--| locked | .--------. + | | mux M1 |-----| dev D2 | + | '----------' '--------' + | .----------. .--------. + .--------. | | parent- |-----| dev D3 | + | root |--+--| locked | '--------' + '--------' | | mux M2 |--. .--------. + | '----------' '--| dev D4 | + | .--------. '--------' + '--| dev D5 | + '--------' + +When D1 or D2 are accessed, accesses to D3 and D4 are locked out while +accesses to D5 may interleave. When D3 or D4 are accessed, accesses to +all other devices are locked out. diff --git a/MAINTAINERS b/MAINTAINERS index 0d4f9a1c7ce4..65f3277a8cf0 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5348,6 +5348,7 @@ I2C MUXES M: Peter Rosin <peda@axentia.se> L: linux-i2c@vger.kernel.org S: Maintained +F: Documentation/i2c/i2c-topology F: Documentation/i2c/muxes/ F: Documentation/devicetree/bindings/i2c/i2c-mux* F: drivers/i2c/i2c-mux.c diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c index 9d233bbde5e1..a8e89df665b9 100644 --- a/drivers/i2c/algos/i2c-algo-bit.c +++ b/drivers/i2c/algos/i2c-algo-bit.c @@ -617,7 +617,7 @@ const struct i2c_algorithm i2c_bit_algo = { }; EXPORT_SYMBOL(i2c_bit_algo); -const struct i2c_adapter_quirks i2c_bit_quirk_no_clk_stretch = { +static const struct i2c_adapter_quirks i2c_bit_quirk_no_clk_stretch = { .flags = I2C_AQ_NO_CLK_STRETCH, }; diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 0967e1a5b3a2..2dd40ddf04de 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -663,7 +663,7 @@ config I2C_MT65XX config I2C_MV64XXX tristate "Marvell mv64xxx I2C Controller" - depends on MV64X60 || PLAT_ORION || ARCH_SUNXI + depends on MV64X60 || PLAT_ORION || ARCH_SUNXI || ARCH_MVEBU help If you say yes to this option, support will be included for the built-in I2C interface on the Marvell 64xxx line of host bridges. diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c index b9f0fff4e723..19c843828fe2 100644 --- a/drivers/i2c/busses/i2c-bcm-iproc.c +++ b/drivers/i2c/busses/i2c-bcm-iproc.c @@ -267,7 +267,7 @@ static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c, iproc_i2c->msg = msg; /* format and load slave address into the TX FIFO */ - addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0); + addr = i2c_8bit_addr_from_msg(msg); writel(addr, iproc_i2c->base + M_TX_OFFSET); /* diff --git a/drivers/i2c/busses/i2c-bcm-kona.c b/drivers/i2c/busses/i2c-bcm-kona.c index 2c9d9b1c8e64..ac9f47679c3a 100644 --- a/drivers/i2c/busses/i2c-bcm-kona.c +++ b/drivers/i2c/busses/i2c-bcm-kona.c @@ -501,10 +501,7 @@ static int bcm_kona_i2c_do_addr(struct bcm_kona_i2c_dev *dev, return -EREMOTEIO; } } else { - addr = msg->addr << 1; - - if (msg->flags & I2C_M_RD) - addr |= 1; + addr = i2c_8bit_addr_from_msg(msg); if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) return -EREMOTEIO; diff --git a/drivers/i2c/busses/i2c-brcmstb.c b/drivers/i2c/busses/i2c-brcmstb.c index 4a45408dd820..6a8cfc1344b2 100644 --- a/drivers/i2c/busses/i2c-brcmstb.c +++ b/drivers/i2c/busses/i2c-brcmstb.c @@ -446,9 +446,7 @@ static int brcmstb_i2c_do_addr(struct brcmstb_i2c_dev *dev, } } else { - addr = msg->addr << 1; - if (msg->flags & I2C_M_RD) - addr |= 1; + addr = i2c_8bit_addr_from_msg(msg); bsc_writel(dev, addr, chip_address); } diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c index b167ab25310a..ee57c1e865e2 100644 --- a/drivers/i2c/busses/i2c-cpm.c +++ b/drivers/i2c/busses/i2c-cpm.c @@ -197,9 +197,7 @@ static void cpm_i2c_parse_message(struct i2c_adapter *adap, tbdf = cpm->tbase + tx; rbdf = cpm->rbase + rx; - addr = pmsg->addr << 1; - if (pmsg->flags & I2C_M_RD) - addr |= 1; + addr = i2c_8bit_addr_from_msg(pmsg); tb = cpm->txbuf[tx]; rb = cpm->rxbuf[rx]; diff --git a/drivers/i2c/busses/i2c-dln2.c b/drivers/i2c/busses/i2c-dln2.c index 1600edd57ce9..f2eb4f76591f 100644 --- a/drivers/i2c/busses/i2c-dln2.c +++ b/drivers/i2c/busses/i2c-dln2.c @@ -19,6 +19,7 @@ #include <linux/i2c.h> #include <linux/platform_device.h> #include <linux/mfd/dln2.h> +#include <linux/acpi.h> #define DLN2_I2C_MODULE_ID 0x03 #define DLN2_I2C_CMD(cmd) DLN2_CMD(cmd, DLN2_I2C_MODULE_ID) @@ -210,6 +211,7 @@ static int dln2_i2c_probe(struct platform_device *pdev) dln2->adapter.algo = &dln2_i2c_usb_algorithm; dln2->adapter.quirks = &dln2_i2c_quirks; dln2->adapter.dev.parent = dev; + ACPI_COMPANION_SET(&dln2->adapter.dev, ACPI_COMPANION(&pdev->dev)); dln2->adapter.dev.of_node = dev->of_node; i2c_set_adapdata(&dln2->adapter, dln2); snprintf(dln2->adapter.name, sizeof(dln2->adapter.name), "%s-%s-%d", diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c index f54ece8fce78..c0e3ada02876 100644 --- a/drivers/i2c/busses/i2c-exynos5.c +++ b/drivers/i2c/busses/i2c-exynos5.c @@ -861,14 +861,8 @@ static int exynos5_i2c_resume_noirq(struct device *dev) #endif static const struct dev_pm_ops exynos5_i2c_dev_pm_ops = { -#ifdef CONFIG_PM_SLEEP - .suspend_noirq = exynos5_i2c_suspend_noirq, - .resume_noirq = exynos5_i2c_resume_noirq, - .freeze_noirq = exynos5_i2c_suspend_noirq, - .thaw_noirq = exynos5_i2c_resume_noirq, - .poweroff_noirq = exynos5_i2c_suspend_noirq, - .restore_noirq = exynos5_i2c_resume_noirq, -#endif + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(exynos5_i2c_suspend_noirq, + exynos5_i2c_resume_noirq) }; static struct platform_driver exynos5_i2c_driver = { diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 585a3b7915bd..64b1208bca5e 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -94,6 +94,7 @@ #include <linux/err.h> #include <linux/platform_device.h> #include <linux/platform_data/itco_wdt.h> +#include <linux/pm_runtime.h> #if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \ defined CONFIG_DMI @@ -714,9 +715,11 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, { int hwpec; int block = 0; - int ret, xact = 0; + int ret = 0, xact = 0; struct i801_priv *priv = i2c_get_adapdata(adap); + pm_runtime_get_sync(&priv->pci_dev->dev); + hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC) && size != I2C_SMBUS_QUICK && size != I2C_SMBUS_I2C_BLOCK_DATA; @@ -773,7 +776,8 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, default: dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n", size); - return -EOPNOTSUPP; + ret = -EOPNOTSUPP; + goto out; } if (hwpec) /* enable/disable hardware PEC */ @@ -796,11 +800,11 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv)); if (block) - return ret; + goto out; if (ret) - return ret; + goto out; if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK)) - return 0; + goto out; switch (xact & 0x7f) { case I801_BYTE: /* Result put in SMBHSTDAT0 */ @@ -812,7 +816,11 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr, (inb_p(SMBHSTDAT1(priv)) << 8); break; } - return 0; + +out: + pm_runtime_mark_last_busy(&priv->pci_dev->dev); + pm_runtime_put_autosuspend(&priv->pci_dev->dev); + return ret; } @@ -1413,6 +1421,11 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id) pci_set_drvdata(dev, priv); + pm_runtime_set_autosuspend_delay(&dev->dev, 1000); + pm_runtime_use_autosuspend(&dev->dev); + pm_runtime_put_autosuspend(&dev->dev); + pm_runtime_allow(&dev->dev); + return 0; } @@ -1420,6 +1433,9 @@ static void i801_remove(struct pci_dev *dev) { struct i801_priv *priv = pci_get_drvdata(dev); + pm_runtime_forbid(&dev->dev); + pm_runtime_get_noresume(&dev->dev); + i801_del_mux(priv); i2c_del_adapter(&priv->adapter); pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg); @@ -1433,34 +1449,32 @@ static void i801_remove(struct pci_dev *dev) } #ifdef CONFIG_PM -static int i801_suspend(struct pci_dev *dev, pm_message_t mesg) +static int i801_suspend(struct device *dev) { - struct i801_priv *priv = pci_get_drvdata(dev); + struct pci_dev *pci_dev = to_pci_dev(dev); + struct i801_priv *priv = pci_get_drvdata(pci_dev); - pci_save_state(dev); - pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg); - pci_set_power_state(dev, pci_choose_state(dev, mesg)); + pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg); return 0; } -static int i801_resume(struct pci_dev *dev) +static int i801_resume(struct device *dev) { - pci_set_power_state(dev, PCI_D0); - pci_restore_state(dev); return 0; } -#else -#define i801_suspend NULL -#define i801_resume NULL #endif +static UNIVERSAL_DEV_PM_OPS(i801_pm_ops, i801_suspend, + i801_resume, NULL); + static struct pci_driver i801_driver = { .name = "i801_smbus", .id_table = i801_ids, .probe = i801_probe, .remove = i801_remove, - .suspend = i801_suspend, - .resume = i801_resume, + .driver = { + .pm = &i801_pm_ops, + }, }; static int __init i2c_i801_init(void) diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c index b6c080334297..cdaa7be2cd1b 100644 --- a/drivers/i2c/busses/i2c-ibm_iic.c +++ b/drivers/i2c/busses/i2c-ibm_iic.c @@ -269,7 +269,7 @@ static int iic_smbus_quick(struct ibm_iic_private* dev, const struct i2c_msg* p) ndelay(t->hd_sta); /* Send address */ - v = (u8)((p->addr << 1) | ((p->flags & I2C_M_RD) ? 1 : 0)); + v = i2c_8bit_addr_from_msg(p); for (i = 0, mask = 0x80; i < 8; ++i, mask >>= 1){ out_8(&iic->directcntl, sda); ndelay(t->low / 2); diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index 379ef9c31664..ea20425b6972 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -751,9 +751,7 @@ static unsigned int img_i2c_atomic(struct img_i2c *i2c, switch (i2c->at_cur_cmd) { case CMD_GEN_START: next_cmd = CMD_GEN_DATA; - next_data = (i2c->msg.addr << 1); - if (i2c->msg.flags & I2C_M_RD) - next_data |= 0x1; + next_data = i2c_8bit_addr_from_msg(&i2c->msg); break; case CMD_GEN_DATA: if (i2c->line_status & LINESTAT_INPUT_HELD_V) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 1ca7ef2314f7..1844bc9f7cd5 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -525,7 +525,7 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode, i2c_imx, IMX_I2C_I2CR); /* Wait controller to be stable */ - udelay(50); + usleep_range(50, 150); /* Start I2C transaction */ temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c index 72d6161cf77c..85cbe4b55578 100644 --- a/drivers/i2c/busses/i2c-iop3xx.c +++ b/drivers/i2c/busses/i2c-iop3xx.c @@ -50,10 +50,7 @@ iic_cook_addr(struct i2c_msg *msg) { unsigned char addr; - addr = (msg->addr << 1); - - if (msg->flags & I2C_M_RD) - addr |= 1; + addr = i2c_8bit_addr_from_msg(msg); return addr; } diff --git a/drivers/i2c/busses/i2c-lpc2k.c b/drivers/i2c/busses/i2c-lpc2k.c index 8560a13bf1b3..586a15205e61 100644 --- a/drivers/i2c/busses/i2c-lpc2k.c +++ b/drivers/i2c/busses/i2c-lpc2k.c @@ -133,9 +133,7 @@ static void i2c_lpc2k_pump_msg(struct lpc2k_i2c *i2c) case M_START: case M_REPSTART: /* Start bit was just sent out, send out addr and dir */ - data = i2c->msg->addr << 1; - if (i2c->msg->flags & I2C_M_RD) - data |= 1; + data = i2c_8bit_addr_from_msg(i2c->msg); writel(data, i2c->base + LPC24XX_I2DAT); writel(LPC24XX_STA, i2c->base + LPC24XX_I2CONCLR); diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 453358b4d9ca..d9373e60be8a 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -413,10 +413,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, else writew(I2C_FS_START_CON, i2c->base + OFFSET_EXT_CONF); - addr_reg = msgs->addr << 1; - if (i2c->op == I2C_MASTER_RD) - addr_reg |= 0x1; - + addr_reg = i2c_8bit_addr_from_msg(msgs); writew(addr_reg, i2c->base + OFFSET_SLAVE_ADDR); /* Clear interrupt status */ diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c index 43207f52e5a3..b4dec0841bc2 100644 --- a/drivers/i2c/busses/i2c-mv64xxx.c +++ b/drivers/i2c/busses/i2c-mv64xxx.c @@ -134,9 +134,7 @@ struct mv64xxx_i2c_data { int rc; u32 freq_m; u32 freq_n; -#if defined(CONFIG_HAVE_CLK) struct clk *clk; -#endif wait_queue_head_t waitq; spinlock_t lock; struct i2c_msg *msg; @@ -757,7 +755,6 @@ static const struct of_device_id mv64xxx_i2c_of_match_table[] = { MODULE_DEVICE_TABLE(of, mv64xxx_i2c_of_match_table); #ifdef CONFIG_OF -#ifdef CONFIG_HAVE_CLK static int mv64xxx_calc_freq(struct mv64xxx_i2c_data *drv_data, const int tclk, const int n, const int m) @@ -791,25 +788,20 @@ mv64xxx_find_baud_factors(struct mv64xxx_i2c_data *drv_data, return false; return true; } -#endif /* CONFIG_HAVE_CLK */ static int mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data, struct device *dev) { - /* CLK is mandatory when using DT to describe the i2c bus. We - * need to know tclk in order to calculate bus clock - * factors. - */ -#if !defined(CONFIG_HAVE_CLK) - /* Have OF but no CLK */ - return -ENODEV; -#else const struct of_device_id *device; struct device_node *np = dev->of_node; u32 bus_freq, tclk; int rc = 0; + /* CLK is mandatory when using DT to describe the i2c bus. We + * need to know tclk in order to calculate bus clock + * factors. + */ if (IS_ERR(drv_data->clk)) { rc = -ENODEV; goto out; @@ -869,7 +861,6 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data, out: return rc; -#endif } #else /* CONFIG_OF */ static int @@ -907,14 +898,13 @@ mv64xxx_i2c_probe(struct platform_device *pd) init_waitqueue_head(&drv_data->waitq); spin_lock_init(&drv_data->lock); -#if defined(CONFIG_HAVE_CLK) /* Not all platforms have a clk */ drv_data->clk = devm_clk_get(&pd->dev, NULL); - if (!IS_ERR(drv_data->clk)) { - clk_prepare(drv_data->clk); - clk_enable(drv_data->clk); - } -#endif + if (IS_ERR(drv_data->clk) && PTR_ERR(drv_data->clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (!IS_ERR(drv_data->clk)) + clk_prepare_enable(drv_data->clk); + if (pdata) { drv_data->freq_m = pdata->freq_m; drv_data->freq_n = pdata->freq_n; @@ -964,13 +954,10 @@ exit_reset: if (!IS_ERR_OR_NULL(drv_data->rstc)) reset_control_assert(drv_data->rstc); exit_clk: -#if defined(CONFIG_HAVE_CLK) /* Not all platforms have a clk */ - if (!IS_ERR(drv_data->clk)) { - clk_disable(drv_data->clk); - clk_unprepare(drv_data->clk); - } -#endif + if (!IS_ERR(drv_data->clk)) + clk_disable_unprepare(drv_data->clk); + return rc; } @@ -983,13 +970,9 @@ mv64xxx_i2c_remove(struct platform_device *dev) free_irq(drv_data->irq, drv_data); if (!IS_ERR_OR_NULL(drv_data->rstc)) reset_control_assert(drv_data->rstc); -#if defined(CONFIG_HAVE_CLK) /* Not all platforms have a clk */ - if (!IS_ERR(drv_data->clk)) { - clk_disable(drv_data->clk); - clk_unprepare(drv_data->clk); - } -#endif + if (!IS_ERR(drv_data->clk)) + clk_disable_unprepare(drv_data->clk); return 0; } diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c index 70b3c9158509..42fcc9458432 100644 --- a/drivers/i2c/busses/i2c-nforce2.c +++ b/drivers/i2c/busses/i2c-nforce2.c @@ -127,7 +127,7 @@ static struct pci_driver nforce2_driver; /* For multiplexing support, we need a global reference to the 1st SMBus channel */ -#if defined CONFIG_I2C_NFORCE2_S4985 || defined CONFIG_I2C_NFORCE2_S4985_MODULE +#if IS_ENABLED(CONFIG_I2C_NFORCE2_S4985) struct i2c_adapter *nforce2_smbus; EXPORT_SYMBOL_GPL(nforce2_smbus); diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index 11b7b87311ed..dfa7a4b4a91d 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -178,10 +178,7 @@ static void ocores_process(struct ocores_i2c *i2c) if (i2c->nmsgs) { /* end? */ /* send start? */ if (!(msg->flags & I2C_M_NOSTART)) { - u8 addr = (msg->addr << 1); - - if (msg->flags & I2C_M_RD) - addr |= 1; + u8 addr = i2c_8bit_addr_from_msg(msg); i2c->state = STATE_START; diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c index 46fb6c42934f..aa5f01efd826 100644 --- a/drivers/i2c/busses/i2c-octeon.c +++ b/drivers/i2c/busses/i2c-octeon.c @@ -11,6 +11,7 @@ * warranty of any kind, whether express or implied. */ +#include <linux/atomic.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/kernel.h> @@ -29,13 +30,23 @@ /* Register offsets */ #define SW_TWSI 0x00 #define TWSI_INT 0x10 +#define SW_TWSI_EXT 0x18 /* Controller command patterns */ #define SW_TWSI_V BIT_ULL(63) /* Valid bit */ +#define SW_TWSI_EIA BIT_ULL(61) /* Extended internal address */ #define SW_TWSI_R BIT_ULL(56) /* Result or read bit */ +#define SW_TWSI_SOVR BIT_ULL(55) /* Size override */ +#define SW_TWSI_SIZE_SHIFT 52 +#define SW_TWSI_ADDR_SHIFT 40 +#define SW_TWSI_IA_SHIFT 32 /* Internal address */ /* Controller opcode word (bits 60:57) */ #define SW_TWSI_OP_SHIFT 57 +#define SW_TWSI_OP_7 (0ULL << SW_TWSI_OP_SHIFT) +#define SW_TWSI_OP_7_IA (1ULL << SW_TWSI_OP_SHIFT) +#define SW_TWSI_OP_10 (2ULL << SW_TWSI_OP_SHIFT) +#define SW_TWSI_OP_10_IA (3ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_TWSI_CLK (4ULL << SW_TWSI_OP_SHIFT) #define SW_TWSI_OP_EOP (6ULL << SW_TWSI_OP_SHIFT) /* Extended opcode */ @@ -48,46 +59,93 @@ #define SW_TWSI_EOP_TWSI_RST (SW_TWSI_OP_EOP | 7ULL << SW_TWSI_EOP_SHIFT) /* Controller command and status bits */ -#define TWSI_CTL_CE 0x80 +#define TWSI_CTL_CE 0x80 /* High level controller enable */ #define TWSI_CTL_ENAB 0x40 /* Bus enable */ #define TWSI_CTL_STA 0x20 /* Master-mode start, HW clears when done */ #define TWSI_CTL_STP 0x10 /* Master-mode stop, HW clears when done */ #define TWSI_CTL_IFLG 0x08 /* HW event, SW writes 0 to ACK */ #define TWSI_CTL_AAK 0x04 /* Assert ACK */ -/* Some status values */ +/* Status values */ +#define STAT_ERROR 0x00 #define STAT_START 0x08 -#define STAT_RSTART 0x10 +#define STAT_REP_START 0x10 #define STAT_TXADDR_ACK 0x18 +#define STAT_TXADDR_NAK 0x20 #define STAT_TXDATA_ACK 0x28 +#define STAT_TXDATA_NAK 0x30 +#define STAT_LOST_ARB_38 0x38 #define STAT_RXADDR_ACK 0x40 +#define STAT_RXADDR_NAK 0x48 #define STAT_RXDATA_ACK 0x50 +#define STAT_RXDATA_NAK 0x58 +#define STAT_SLAVE_60 0x60 +#define STAT_LOST_ARB_68 0x68 +#define STAT_SLAVE_70 0x70 +#define STAT_LOST_ARB_78 0x78 +#define STAT_SLAVE_80 0x80 +#define STAT_SLAVE_88 0x88 +#define STAT_GENDATA_ACK 0x90 +#define STAT_GENDATA_NAK 0x98 +#define STAT_SLAVE_A0 0xA0 +#define STAT_SLAVE_A8 0xA8 +#define STAT_LOST_ARB_B0 0xB0 +#define STAT_SLAVE_LOST 0xB8 +#define STAT_SLAVE_NAK 0xC0 +#define STAT_SLAVE_ACK 0xC8 +#define STAT_AD2W_ACK 0xD0 +#define STAT_AD2W_NAK 0xD8 #define STAT_IDLE 0xF8 /* TWSI_INT values */ +#define TWSI_INT_ST_INT BIT_ULL(0) +#define TWSI_INT_TS_INT BIT_ULL(1) +#define TWSI_INT_CORE_INT BIT_ULL(2) +#define TWSI_INT_ST_EN BIT_ULL(4) +#define TWSI_INT_TS_EN BIT_ULL(5) #define TWSI_INT_CORE_EN BIT_ULL(6) #define TWSI_INT_SDA_OVR BIT_ULL(8) #define TWSI_INT_SCL_OVR BIT_ULL(9) +#define TWSI_INT_SDA BIT_ULL(10) +#define TWSI_INT_SCL BIT_ULL(11) + +#define I2C_OCTEON_EVENT_WAIT 80 /* microseconds */ struct octeon_i2c { wait_queue_head_t queue; struct i2c_adapter adap; int irq; + int hlc_irq; /* For cn7890 only */ u32 twsi_freq; int sys_freq; void __iomem *twsi_base; struct device *dev; + bool hlc_enabled; + bool broken_irq_mode; + bool broken_irq_check; + void (*int_enable)(struct octeon_i2c *); + void (*int_disable)(struct octeon_i2c *); + void (*hlc_int_enable)(struct octeon_i2c *); + void (*hlc_int_disable)(struct octeon_i2c *); + atomic_t int_enable_cnt; + atomic_t hlc_int_enable_cnt; }; +static void octeon_i2c_writeq_flush(u64 val, void __iomem *addr) +{ + __raw_writeq(val, addr); + __raw_readq(addr); /* wait for write to land */ +} + /** - * octeon_i2c_write_sw - write an I2C core register + * octeon_i2c_reg_write - write an I2C core register * @i2c: The struct octeon_i2c * @eop_reg: Register selector * @data: Value to be written * * The I2C core registers are accessed indirectly via the SW_TWSI CSR. */ -static void octeon_i2c_write_sw(struct octeon_i2c *i2c, u64 eop_reg, u8 data) +static void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8 data) { u64 tmp; @@ -97,8 +155,13 @@ static void octeon_i2c_write_sw(struct octeon_i2c *i2c, u64 eop_reg, u8 data) } while ((tmp & SW_TWSI_V) != 0); } +#define octeon_i2c_ctl_write(i2c, val) \ + octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, val) +#define octeon_i2c_data_write(i2c, val) \ + octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, val) + /** - * octeon_i2c_read_sw - read lower bits of an I2C core register + * octeon_i2c_reg_read - read lower bits of an I2C core register * @i2c: The struct octeon_i2c * @eop_reg: Register selector * @@ -106,7 +169,7 @@ static void octeon_i2c_write_sw(struct octeon_i2c *i2c, u64 eop_reg, u8 data) * * The I2C core registers are accessed indirectly via the SW_TWSI CSR. */ -static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg) +static u8 octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg) { u64 tmp; @@ -118,6 +181,24 @@ static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg) return tmp & 0xFF; } +#define octeon_i2c_ctl_read(i2c) \ + octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL) +#define octeon_i2c_data_read(i2c) \ + octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA) +#define octeon_i2c_stat_read(i2c) \ + octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT) + +/** + * octeon_i2c_read_int - read the TWSI_INT register + * @i2c: The struct octeon_i2c + * + * Returns the value of the register. + */ +static u64 octeon_i2c_read_int(struct octeon_i2c *i2c) +{ + return __raw_readq(i2c->twsi_base + TWSI_INT); +} + /** * octeon_i2c_write_int - write the TWSI_INT register * @i2c: The struct octeon_i2c @@ -125,8 +206,7 @@ static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg) */ static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data) { - __raw_writeq(data, i2c->twsi_base + TWSI_INT); - __raw_readq(i2c->twsi_base + TWSI_INT); + octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT); } /** @@ -149,30 +229,96 @@ static void octeon_i2c_int_disable(struct octeon_i2c *i2c) } /** - * octeon_i2c_unblock - unblock the bus + * octeon_i2c_int_enable78 - enable the CORE interrupt * @i2c: The struct octeon_i2c * - * If there was a reset while a device was driving 0 to bus, bus is blocked. - * We toggle it free manually by some clock cycles and send a stop. + * The interrupt will be asserted when there is non-STAT_IDLE state in the + * SW_TWSI_EOP_TWSI_STAT register. */ -static void octeon_i2c_unblock(struct octeon_i2c *i2c) +static void octeon_i2c_int_enable78(struct octeon_i2c *i2c) +{ + atomic_inc_return(&i2c->int_enable_cnt); + enable_irq(i2c->irq); +} + +static void __octeon_i2c_irq_disable(atomic_t *cnt, int irq) { - int i; + int count; + + /* + * The interrupt can be disabled in two places, but we only + * want to make the disable_irq_nosync() call once, so keep + * track with the atomic variable. + */ + count = atomic_dec_if_positive(cnt); + if (count >= 0) + disable_irq_nosync(irq); +} + +/* disable the CORE interrupt */ +static void octeon_i2c_int_disable78(struct octeon_i2c *i2c) +{ + __octeon_i2c_irq_disable(&i2c->int_enable_cnt, i2c->irq); +} + +/** + * octeon_i2c_hlc_int_enable78 - enable the ST interrupt + * @i2c: The struct octeon_i2c + * + * The interrupt will be asserted when there is non-STAT_IDLE state in + * the SW_TWSI_EOP_TWSI_STAT register. + */ +static void octeon_i2c_hlc_int_enable78(struct octeon_i2c *i2c) +{ + atomic_inc_return(&i2c->hlc_int_enable_cnt); + enable_irq(i2c->hlc_irq); +} + +/* disable the ST interrupt */ +static void octeon_i2c_hlc_int_disable78(struct octeon_i2c *i2c) +{ + __octeon_i2c_irq_disable(&i2c->hlc_int_enable_cnt, i2c->hlc_irq); +} + +/* + * Cleanup low-level state & enable high-level controller. + */ +static void octeon_i2c_hlc_enable(struct octeon_i2c *i2c) +{ + int try = 0; + u64 val; + + if (i2c->hlc_enabled) + return; + i2c->hlc_enabled = true; + + while (1) { + val = octeon_i2c_ctl_read(i2c); + if (!(val & (TWSI_CTL_STA | TWSI_CTL_STP))) + break; + + /* clear IFLG event */ + if (val & TWSI_CTL_IFLG) + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); - dev_dbg(i2c->dev, "%s\n", __func__); + if (try++ > 100) { + pr_err("%s: giving up\n", __func__); + break; + } - for (i = 0; i < 9; i++) { - octeon_i2c_write_int(i2c, 0); - udelay(5); - octeon_i2c_write_int(i2c, TWSI_INT_SCL_OVR); - udelay(5); + /* spin until any start/stop has finished */ + udelay(10); } - /* hand-crank a STOP */ - octeon_i2c_write_int(i2c, TWSI_INT_SDA_OVR | TWSI_INT_SCL_OVR); - udelay(5); - octeon_i2c_write_int(i2c, TWSI_INT_SDA_OVR); - udelay(5); - octeon_i2c_write_int(i2c, 0); + octeon_i2c_ctl_write(i2c, TWSI_CTL_CE | TWSI_CTL_AAK | TWSI_CTL_ENAB); +} + +static void octeon_i2c_hlc_disable(struct octeon_i2c *i2c) +{ + if (!i2c->hlc_enabled) + return; + + i2c->hlc_enabled = false; + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); } /* interrupt service routine */ @@ -180,16 +326,44 @@ static irqreturn_t octeon_i2c_isr(int irq, void *dev_id) { struct octeon_i2c *i2c = dev_id; - octeon_i2c_int_disable(i2c); + i2c->int_disable(i2c); + wake_up(&i2c->queue); + + return IRQ_HANDLED; +} + +/* HLC interrupt service routine */ +static irqreturn_t octeon_i2c_hlc_isr78(int irq, void *dev_id) +{ + struct octeon_i2c *i2c = dev_id; + + i2c->hlc_int_disable(i2c); wake_up(&i2c->queue); return IRQ_HANDLED; } +static bool octeon_i2c_test_iflg(struct octeon_i2c *i2c) +{ + return (octeon_i2c_ctl_read(i2c) & TWSI_CTL_IFLG); +} -static int octeon_i2c_test_iflg(struct octeon_i2c *i2c) +static bool octeon_i2c_test_ready(struct octeon_i2c *i2c, bool *first) { - return (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_CTL) & TWSI_CTL_IFLG) != 0; + if (octeon_i2c_test_iflg(i2c)) + return true; + + if (*first) { + *first = false; + return false; + } + + /* + * IRQ has signaled an event but IFLG hasn't changed. + * Sleep and retry once. + */ + usleep_range(I2C_OCTEON_EVENT_WAIT, 2 * I2C_OCTEON_EVENT_WAIT); + return octeon_i2c_test_iflg(i2c); } /** @@ -201,64 +375,493 @@ static int octeon_i2c_test_iflg(struct octeon_i2c *i2c) static int octeon_i2c_wait(struct octeon_i2c *i2c) { long time_left; + bool first = 1; - octeon_i2c_int_enable(i2c); - time_left = wait_event_timeout(i2c->queue, octeon_i2c_test_iflg(i2c), + /* + * Some chip revisions don't assert the irq in the interrupt + * controller. So we must poll for the IFLG change. + */ + if (i2c->broken_irq_mode) { + u64 end = get_jiffies_64() + i2c->adap.timeout; + + while (!octeon_i2c_test_iflg(i2c) && + time_before64(get_jiffies_64(), end)) + usleep_range(I2C_OCTEON_EVENT_WAIT / 2, I2C_OCTEON_EVENT_WAIT); + + return octeon_i2c_test_iflg(i2c) ? 0 : -ETIMEDOUT; + } + + i2c->int_enable(i2c); + time_left = wait_event_timeout(i2c->queue, octeon_i2c_test_ready(i2c, &first), i2c->adap.timeout); - octeon_i2c_int_disable(i2c); - if (!time_left) { - dev_dbg(i2c->dev, "%s: timeout\n", __func__); - return -ETIMEDOUT; + i2c->int_disable(i2c); + + if (i2c->broken_irq_check && !time_left && + octeon_i2c_test_iflg(i2c)) { + dev_err(i2c->dev, "broken irq connection detected, switching to polling mode.\n"); + i2c->broken_irq_mode = true; + return 0; } + if (!time_left) + return -ETIMEDOUT; + return 0; } +static int octeon_i2c_check_status(struct octeon_i2c *i2c, int final_read) +{ + u8 stat = octeon_i2c_stat_read(i2c); + + switch (stat) { + /* Everything is fine */ + case STAT_IDLE: + case STAT_AD2W_ACK: + case STAT_RXADDR_ACK: + case STAT_TXADDR_ACK: + case STAT_TXDATA_ACK: + return 0; + + /* ACK allowed on pre-terminal bytes only */ + case STAT_RXDATA_ACK: + if (!final_read) + return 0; + return -EIO; + + /* NAK allowed on terminal byte only */ + case STAT_RXDATA_NAK: + if (final_read) + return 0; + return -EIO; + + /* Arbitration lost */ + case STAT_LOST_ARB_38: + case STAT_LOST_ARB_68: + case STAT_LOST_ARB_78: + case STAT_LOST_ARB_B0: + return -EAGAIN; + + /* Being addressed as slave, should back off & listen */ + case STAT_SLAVE_60: + case STAT_SLAVE_70: + case STAT_GENDATA_ACK: + case STAT_GENDATA_NAK: + return -EOPNOTSUPP; + + /* Core busy as slave */ + case STAT_SLAVE_80: + case STAT_SLAVE_88: + case STAT_SLAVE_A0: + case STAT_SLAVE_A8: + case STAT_SLAVE_LOST: + case STAT_SLAVE_NAK: + case STAT_SLAVE_ACK: + return -EOPNOTSUPP; + + case STAT_TXDATA_NAK: + return -EIO; + case STAT_TXADDR_NAK: + case STAT_RXADDR_NAK: + case STAT_AD2W_NAK: + return -ENXIO; + default: + dev_err(i2c->dev, "unhandled state: %d\n", stat); + return -EIO; + } +} + +static bool octeon_i2c_hlc_test_valid(struct octeon_i2c *i2c) +{ + return (__raw_readq(i2c->twsi_base + SW_TWSI) & SW_TWSI_V) == 0; +} + +static bool octeon_i2c_hlc_test_ready(struct octeon_i2c *i2c, bool *first) +{ + /* check if valid bit is cleared */ + if (octeon_i2c_hlc_test_valid(i2c)) + return true; + + if (*first) { + *first = false; + return false; + } + + /* + * IRQ has signaled an event but valid bit isn't cleared. + * Sleep and retry once. + */ + usleep_range(I2C_OCTEON_EVENT_WAIT, 2 * I2C_OCTEON_EVENT_WAIT); + return octeon_i2c_hlc_test_valid(i2c); +} + +static void octeon_i2c_hlc_int_enable(struct octeon_i2c *i2c) +{ + octeon_i2c_write_int(i2c, TWSI_INT_ST_EN); +} + +static void octeon_i2c_hlc_int_clear(struct octeon_i2c *i2c) +{ + /* clear ST/TS events, listen for neither */ + octeon_i2c_write_int(i2c, TWSI_INT_ST_INT | TWSI_INT_TS_INT); +} + /** - * octeon_i2c_start - send START to the bus + * octeon_i2c_hlc_wait - wait for an HLC operation to complete * @i2c: The struct octeon_i2c * - * Returns 0 on success, otherwise a negative errno. + * Returns 0 on success, otherwise -ETIMEDOUT. */ -static int octeon_i2c_start(struct octeon_i2c *i2c) +static int octeon_i2c_hlc_wait(struct octeon_i2c *i2c) { - int result; - u8 data; + bool first = 1; + int time_left; - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, - TWSI_CTL_ENAB | TWSI_CTL_STA); + /* + * Some cn38xx boards don't assert the irq in the interrupt + * controller. So we must poll for the valid bit change. + */ + if (i2c->broken_irq_mode) { + u64 end = get_jiffies_64() + i2c->adap.timeout; - result = octeon_i2c_wait(i2c); - if (result) { - if (octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) { + while (!octeon_i2c_hlc_test_valid(i2c) && + time_before64(get_jiffies_64(), end)) + usleep_range(I2C_OCTEON_EVENT_WAIT / 2, I2C_OCTEON_EVENT_WAIT); + + return octeon_i2c_hlc_test_valid(i2c) ? 0 : -ETIMEDOUT; + } + + i2c->hlc_int_enable(i2c); + time_left = wait_event_timeout(i2c->queue, + octeon_i2c_hlc_test_ready(i2c, &first), + i2c->adap.timeout); + i2c->hlc_int_disable(i2c); + if (!time_left) + octeon_i2c_hlc_int_clear(i2c); + + if (i2c->broken_irq_check && !time_left && + octeon_i2c_hlc_test_valid(i2c)) { + dev_err(i2c->dev, "broken irq connection detected, switching to polling mode.\n"); + i2c->broken_irq_mode = true; + return 0; + } + + if (!time_left) + return -ETIMEDOUT; + return 0; +} + +/* high-level-controller pure read of up to 8 bytes */ +static int octeon_i2c_hlc_read(struct octeon_i2c *i2c, struct i2c_msg *msgs) +{ + int i, j, ret = 0; + u64 cmd; + + octeon_i2c_hlc_enable(i2c); + octeon_i2c_hlc_int_clear(i2c); + + cmd = SW_TWSI_V | SW_TWSI_R | SW_TWSI_SOVR; + /* SIZE */ + cmd |= (u64)(msgs[0].len - 1) << SW_TWSI_SIZE_SHIFT; + /* A */ + cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT; + + if (msgs[0].flags & I2C_M_TEN) + cmd |= SW_TWSI_OP_10; + else + cmd |= SW_TWSI_OP_7; + + octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI); + ret = octeon_i2c_hlc_wait(i2c); + if (ret) + goto err; + + cmd = __raw_readq(i2c->twsi_base + SW_TWSI); + if ((cmd & SW_TWSI_R) == 0) + return -EAGAIN; + + for (i = 0, j = msgs[0].len - 1; i < msgs[0].len && i < 4; i++, j--) + msgs[0].buf[j] = (cmd >> (8 * i)) & 0xff; + + if (msgs[0].len > 4) { + cmd = __raw_readq(i2c->twsi_base + SW_TWSI_EXT); + for (i = 0; i < msgs[0].len - 4 && i < 4; i++, j--) + msgs[0].buf[j] = (cmd >> (8 * i)) & 0xff; + } + +err: + return ret; +} + +/* high-level-controller pure write of up to 8 bytes */ +static int octeon_i2c_hlc_write(struct octeon_i2c *i2c, struct i2c_msg *msgs) +{ + int i, j, ret = 0; + u64 cmd; + + octeon_i2c_hlc_enable(i2c); + octeon_i2c_hlc_int_clear(i2c); + + cmd = SW_TWSI_V | SW_TWSI_SOVR; + /* SIZE */ + cmd |= (u64)(msgs[0].len - 1) << SW_TWSI_SIZE_SHIFT; + /* A */ + cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT; + + if (msgs[0].flags & I2C_M_TEN) + cmd |= SW_TWSI_OP_10; + else + cmd |= SW_TWSI_OP_7; + + for (i = 0, j = msgs[0].len - 1; i < msgs[0].len && i < 4; i++, j--) + cmd |= (u64)msgs[0].buf[j] << (8 * i); + + if (msgs[0].len > 4) { + u64 ext = 0; + + for (i = 0; i < msgs[0].len - 4 && i < 4; i++, j--) + ext |= (u64)msgs[0].buf[j] << (8 * i); + octeon_i2c_writeq_flush(ext, i2c->twsi_base + SW_TWSI_EXT); + } + + octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI); + ret = octeon_i2c_hlc_wait(i2c); + if (ret) + goto err; + + cmd = __raw_readq(i2c->twsi_base + SW_TWSI); + if ((cmd & SW_TWSI_R) == 0) + return -EAGAIN; + + ret = octeon_i2c_check_status(i2c, false); + +err: + return ret; +} + +/* high-level-controller composite write+read, msg0=addr, msg1=data */ +static int octeon_i2c_hlc_comp_read(struct octeon_i2c *i2c, struct i2c_msg *msgs) +{ + int i, j, ret = 0; + u64 cmd; + + octeon_i2c_hlc_enable(i2c); + + cmd = SW_TWSI_V | SW_TWSI_R | SW_TWSI_SOVR; + /* SIZE */ + cmd |= (u64)(msgs[1].len - 1) << SW_TWSI_SIZE_SHIFT; + /* A */ + cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT; + + if (msgs[0].flags & I2C_M_TEN) + cmd |= SW_TWSI_OP_10_IA; + else + cmd |= SW_TWSI_OP_7_IA; + + if (msgs[0].len == 2) { + u64 ext = 0; + + cmd |= SW_TWSI_EIA; + ext = (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT; + cmd |= (u64)msgs[0].buf[1] << SW_TWSI_IA_SHIFT; + octeon_i2c_writeq_flush(ext, i2c->twsi_base + SW_TWSI_EXT); + } else { + cmd |= (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT; + } + + octeon_i2c_hlc_int_clear(i2c); + octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI); + + ret = octeon_i2c_hlc_wait(i2c); + if (ret) + goto err; + + cmd = __raw_readq(i2c->twsi_base + SW_TWSI); + if ((cmd & SW_TWSI_R) == 0) + return -EAGAIN; + + for (i = 0, j = msgs[1].len - 1; i < msgs[1].len && i < 4; i++, j--) + msgs[1].buf[j] = (cmd >> (8 * i)) & 0xff; + + if (msgs[1].len > 4) { + cmd = __raw_readq(i2c->twsi_base + SW_TWSI_EXT); + for (i = 0; i < msgs[1].len - 4 && i < 4; i++, j--) + msgs[1].buf[j] = (cmd >> (8 * i)) & 0xff; + } + +err: + return ret; +} + +/* high-level-controller composite write+write, m[0]len<=2, m[1]len<=8 */ +static int octeon_i2c_hlc_comp_write(struct octeon_i2c *i2c, struct i2c_msg *msgs) +{ + bool set_ext = false; + int i, j, ret = 0; + u64 cmd, ext = 0; + + octeon_i2c_hlc_enable(i2c); + + cmd = SW_TWSI_V | SW_TWSI_SOVR; + /* SIZE */ + cmd |= (u64)(msgs[1].len - 1) << SW_TWSI_SIZE_SHIFT; + /* A */ + cmd |= (u64)(msgs[0].addr & 0x7full) << SW_TWSI_ADDR_SHIFT; + + if (msgs[0].flags & I2C_M_TEN) + cmd |= SW_TWSI_OP_10_IA; + else + cmd |= SW_TWSI_OP_7_IA; + + if (msgs[0].len == 2) { + cmd |= SW_TWSI_EIA; + ext |= (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT; + set_ext = true; + cmd |= (u64)msgs[0].buf[1] << SW_TWSI_IA_SHIFT; + } else { + cmd |= (u64)msgs[0].buf[0] << SW_TWSI_IA_SHIFT; + } + + for (i = 0, j = msgs[1].len - 1; i < msgs[1].len && i < 4; i++, j--) + cmd |= (u64)msgs[1].buf[j] << (8 * i); + + if (msgs[1].len > 4) { + for (i = 0; i < msgs[1].len - 4 && i < 4; i++, j--) + ext |= (u64)msgs[1].buf[j] << (8 * i); + set_ext = true; + } + if (set_ext) + octeon_i2c_writeq_flush(ext, i2c->twsi_base + SW_TWSI_EXT); + + octeon_i2c_hlc_int_clear(i2c); + octeon_i2c_writeq_flush(cmd, i2c->twsi_base + SW_TWSI); + + ret = octeon_i2c_hlc_wait(i2c); + if (ret) + goto err; + + cmd = __raw_readq(i2c->twsi_base + SW_TWSI); + if ((cmd & SW_TWSI_R) == 0) + return -EAGAIN; + + ret = octeon_i2c_check_status(i2c, false); + +err: + return ret; +} + +/* calculate and set clock divisors */ +static void octeon_i2c_set_clock(struct octeon_i2c *i2c) +{ + int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff; + int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000; + + for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) { + /* + * An mdiv value of less than 2 seems to not work well + * with ds1337 RTCs, so we constrain it to larger values. + */ + for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) { /* - * Controller refused to send start flag May - * be a client is holding SDA low - let's try - * to free it. + * For given ndiv and mdiv values check the + * two closest thp values. */ - octeon_i2c_unblock(i2c); - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, - TWSI_CTL_ENAB | TWSI_CTL_STA); - result = octeon_i2c_wait(i2c); + tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10; + tclk *= (1 << ndiv_idx); + thp_base = (i2c->sys_freq / (tclk * 2)) - 1; + + for (inc = 0; inc <= 1; inc++) { + thp_idx = thp_base + inc; + if (thp_idx < 5 || thp_idx > 0xff) + continue; + + foscl = i2c->sys_freq / (2 * (thp_idx + 1)); + foscl = foscl / (1 << ndiv_idx); + foscl = foscl / (mdiv_idx + 1) / 10; + diff = abs(foscl - i2c->twsi_freq); + if (diff < delta_hz) { + delta_hz = diff; + thp = thp_idx; + mdiv = mdiv_idx; + ndiv = ndiv_idx; + } + } } - if (result) - return result; } + octeon_i2c_reg_write(i2c, SW_TWSI_OP_TWSI_CLK, thp); + octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv); +} + +static int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c) +{ + u8 status = 0; + int tries; + + /* reset controller */ + octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_RST, 0); - data = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT); - if ((data != STAT_START) && (data != STAT_RSTART)) { - dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data); + for (tries = 10; tries && status != STAT_IDLE; tries--) { + udelay(1); + status = octeon_i2c_stat_read(i2c); + if (status == STAT_IDLE) + break; + } + + if (status != STAT_IDLE) { + dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", + __func__, status); return -EIO; } + /* toggle twice to force both teardowns */ + octeon_i2c_hlc_enable(i2c); + octeon_i2c_hlc_disable(i2c); return 0; } +static int octeon_i2c_recovery(struct octeon_i2c *i2c) +{ + int ret; + + ret = i2c_recover_bus(&i2c->adap); + if (ret) + /* recover failed, try hardware re-init */ + ret = octeon_i2c_init_lowlevel(i2c); + return ret; +} + +/** + * octeon_i2c_start - send START to the bus + * @i2c: The struct octeon_i2c + * + * Returns 0 on success, otherwise a negative errno. + */ +static int octeon_i2c_start(struct octeon_i2c *i2c) +{ + int ret; + u8 stat; + + octeon_i2c_hlc_disable(i2c); + + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_STA); + ret = octeon_i2c_wait(i2c); + if (ret) + goto error; + + stat = octeon_i2c_stat_read(i2c); + if (stat == STAT_START || stat == STAT_REP_START) + /* START successful, bail out */ + return 0; + +error: + /* START failed, try to recover */ + ret = octeon_i2c_recovery(i2c); + return (ret) ? ret : -EAGAIN; +} + /* send STOP to the bus */ static void octeon_i2c_stop(struct octeon_i2c *i2c) { - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, - TWSI_CTL_ENAB | TWSI_CTL_STP); + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_STP); } /** @@ -276,31 +879,21 @@ static int octeon_i2c_write(struct octeon_i2c *i2c, int target, const u8 *data, int length) { int i, result; - u8 tmp; - - result = octeon_i2c_start(i2c); - if (result) - return result; - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1); - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB); + octeon_i2c_data_write(i2c, target << 1); + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); result = octeon_i2c_wait(i2c); if (result) return result; for (i = 0; i < length; i++) { - tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT); - - if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) { - dev_err(i2c->dev, - "%s: bad status before write (0x%x)\n", - __func__, tmp); - return -EIO; - } + result = octeon_i2c_check_status(i2c, false); + if (result) + return result; - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]); - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB); + octeon_i2c_data_write(i2c, data[i]); + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); result = octeon_i2c_wait(i2c); if (result) @@ -326,44 +919,36 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target, u8 *data, u16 *rlength, bool recv_len) { int i, result, length = *rlength; - u8 tmp; + bool final_read = false; - if (length < 1) - return -EINVAL; + octeon_i2c_data_write(i2c, (target << 1) | 1); + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); - result = octeon_i2c_start(i2c); + result = octeon_i2c_wait(i2c); if (result) return result; - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_DATA, (target << 1) | 1); - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB); - - result = octeon_i2c_wait(i2c); + /* address OK ? */ + result = octeon_i2c_check_status(i2c, false); if (result) return result; for (i = 0; i < length; i++) { - tmp = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT); + /* for the last byte TWSI_CTL_AAK must not be set */ + if (i + 1 == length) + final_read = true; - if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) { - dev_err(i2c->dev, - "%s: bad status before read (0x%x)\n", - __func__, tmp); - return -EIO; - } - - if (i + 1 < length) - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, - TWSI_CTL_ENAB | TWSI_CTL_AAK); + /* clear iflg to allow next event */ + if (final_read) + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); else - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, - TWSI_CTL_ENAB); + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_AAK); result = octeon_i2c_wait(i2c); if (result) return result; - data[i] = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_DATA); + data[i] = octeon_i2c_data_read(i2c); if (recv_len && i == 0) { if (data[i] > I2C_SMBUS_BLOCK_MAX + 1) { dev_err(i2c->dev, @@ -373,6 +958,10 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target, } length += data[i]; } + + result = octeon_i2c_check_status(i2c, final_read); + if (result) + return result; } *rlength = length; return 0; @@ -392,13 +981,41 @@ static int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, struct octeon_i2c *i2c = i2c_get_adapdata(adap); int i, ret = 0; + if (num == 1) { + if (msgs[0].len > 0 && msgs[0].len <= 8) { + if (msgs[0].flags & I2C_M_RD) + ret = octeon_i2c_hlc_read(i2c, msgs); + else + ret = octeon_i2c_hlc_write(i2c, msgs); + goto out; + } + } else if (num == 2) { + if ((msgs[0].flags & I2C_M_RD) == 0 && + (msgs[1].flags & I2C_M_RECV_LEN) == 0 && + msgs[0].len > 0 && msgs[0].len <= 2 && + msgs[1].len > 0 && msgs[1].len <= 8 && + msgs[0].addr == msgs[1].addr) { + if (msgs[1].flags & I2C_M_RD) + ret = octeon_i2c_hlc_comp_read(i2c, msgs); + else + ret = octeon_i2c_hlc_comp_write(i2c, msgs); + goto out; + } + } + for (i = 0; ret == 0 && i < num; i++) { struct i2c_msg *pmsg = &msgs[i]; - dev_dbg(i2c->dev, - "Doing %s %d byte(s) to/from 0x%02x - %d of %d messages\n", - pmsg->flags & I2C_M_RD ? "read" : "write", - pmsg->len, pmsg->addr, i + 1, num); + /* zero-length messages are not supported */ + if (!pmsg->len) { + ret = -EOPNOTSUPP; + break; + } + + ret = octeon_i2c_start(i2c); + if (ret) + return ret; + if (pmsg->flags & I2C_M_RD) ret = octeon_i2c_read(i2c, pmsg->addr, pmsg->buf, &pmsg->len, pmsg->flags & I2C_M_RECV_LEN); @@ -407,102 +1024,105 @@ static int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, pmsg->len); } octeon_i2c_stop(i2c); - +out: return (ret != 0) ? ret : num; } -static u32 octeon_i2c_functionality(struct i2c_adapter *adap) +static int octeon_i2c_get_scl(struct i2c_adapter *adap) { - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | - I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL; + struct octeon_i2c *i2c = i2c_get_adapdata(adap); + u64 state; + + state = octeon_i2c_read_int(i2c); + return state & TWSI_INT_SCL; } -static const struct i2c_algorithm octeon_i2c_algo = { - .master_xfer = octeon_i2c_xfer, - .functionality = octeon_i2c_functionality, -}; +static void octeon_i2c_set_scl(struct i2c_adapter *adap, int val) +{ + struct octeon_i2c *i2c = i2c_get_adapdata(adap); -static struct i2c_adapter octeon_i2c_ops = { - .owner = THIS_MODULE, - .name = "OCTEON adapter", - .algo = &octeon_i2c_algo, - .timeout = HZ / 50, -}; + octeon_i2c_write_int(i2c, TWSI_INT_SCL_OVR); +} -/* calculate and set clock divisors */ -static void octeon_i2c_set_clock(struct octeon_i2c *i2c) +static int octeon_i2c_get_sda(struct i2c_adapter *adap) { - int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff; - int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000; + struct octeon_i2c *i2c = i2c_get_adapdata(adap); + u64 state; - for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) { - /* - * An mdiv value of less than 2 seems to not work well - * with ds1337 RTCs, so we constrain it to larger values. - */ - for (mdiv_idx = 15; mdiv_idx >= 2 && delta_hz != 0; mdiv_idx--) { - /* - * For given ndiv and mdiv values check the - * two closest thp values. - */ - tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10; - tclk *= (1 << ndiv_idx); - thp_base = (i2c->sys_freq / (tclk * 2)) - 1; + state = octeon_i2c_read_int(i2c); + return state & TWSI_INT_SDA; +} - for (inc = 0; inc <= 1; inc++) { - thp_idx = thp_base + inc; - if (thp_idx < 5 || thp_idx > 0xff) - continue; +static void octeon_i2c_prepare_recovery(struct i2c_adapter *adap) +{ + struct octeon_i2c *i2c = i2c_get_adapdata(adap); - foscl = i2c->sys_freq / (2 * (thp_idx + 1)); - foscl = foscl / (1 << ndiv_idx); - foscl = foscl / (mdiv_idx + 1) / 10; - diff = abs(foscl - i2c->twsi_freq); - if (diff < delta_hz) { - delta_hz = diff; - thp = thp_idx; - mdiv = mdiv_idx; - ndiv = ndiv_idx; - } - } - } - } - octeon_i2c_write_sw(i2c, SW_TWSI_OP_TWSI_CLK, thp); - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv); + /* + * The stop resets the state machine, does not _transmit_ STOP unless + * engine was active. + */ + octeon_i2c_stop(i2c); + + octeon_i2c_hlc_disable(i2c); + octeon_i2c_write_int(i2c, 0); } -static int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c) +static void octeon_i2c_unprepare_recovery(struct i2c_adapter *adap) { - u8 status; - int tries; + struct octeon_i2c *i2c = i2c_get_adapdata(adap); - /* disable high level controller, enable bus access */ - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB); + octeon_i2c_write_int(i2c, 0); +} - /* reset controller */ - octeon_i2c_write_sw(i2c, SW_TWSI_EOP_TWSI_RST, 0); +static struct i2c_bus_recovery_info octeon_i2c_recovery_info = { + .recover_bus = i2c_generic_scl_recovery, + .get_scl = octeon_i2c_get_scl, + .set_scl = octeon_i2c_set_scl, + .get_sda = octeon_i2c_get_sda, + .prepare_recovery = octeon_i2c_prepare_recovery, + .unprepare_recovery = octeon_i2c_unprepare_recovery, +}; - for (tries = 10; tries; tries--) { - udelay(1); - status = octeon_i2c_read_sw(i2c, SW_TWSI_EOP_TWSI_STAT); - if (status == STAT_IDLE) - return 0; - } - dev_err(i2c->dev, "%s: TWSI_RST failed! (0x%x)\n", __func__, status); - return -EIO; +static u32 octeon_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | + I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL; } +static const struct i2c_algorithm octeon_i2c_algo = { + .master_xfer = octeon_i2c_xfer, + .functionality = octeon_i2c_functionality, +}; + +static struct i2c_adapter octeon_i2c_ops = { + .owner = THIS_MODULE, + .name = "OCTEON adapter", + .algo = &octeon_i2c_algo, +}; + static int octeon_i2c_probe(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node; + int irq, result = 0, hlc_irq = 0; struct resource *res_mem; struct octeon_i2c *i2c; - int irq, result = 0; - - /* All adaptors have an irq. */ - irq = platform_get_irq(pdev, 0); - if (irq < 0) - return irq; + bool cn78xx_style; + + cn78xx_style = of_device_is_compatible(node, "cavium,octeon-7890-twsi"); + if (cn78xx_style) { + hlc_irq = platform_get_irq(pdev, 0); + if (hlc_irq < 0) + return hlc_irq; + + irq = platform_get_irq(pdev, 2); + if (irq < 0) + return irq; + } else { + /* All adaptors have an irq. */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + } i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); if (!i2c) { @@ -537,6 +1157,31 @@ static int octeon_i2c_probe(struct platform_device *pdev) i2c->irq = irq; + if (cn78xx_style) { + i2c->hlc_irq = hlc_irq; + + i2c->int_enable = octeon_i2c_int_enable78; + i2c->int_disable = octeon_i2c_int_disable78; + i2c->hlc_int_enable = octeon_i2c_hlc_int_enable78; + i2c->hlc_int_disable = octeon_i2c_hlc_int_disable78; + + irq_set_status_flags(i2c->irq, IRQ_NOAUTOEN); + irq_set_status_flags(i2c->hlc_irq, IRQ_NOAUTOEN); + + result = devm_request_irq(&pdev->dev, i2c->hlc_irq, + octeon_i2c_hlc_isr78, 0, + DRV_NAME, i2c); + if (result < 0) { + dev_err(i2c->dev, "failed to attach interrupt\n"); + goto out; + } + } else { + i2c->int_enable = octeon_i2c_int_enable; + i2c->int_disable = octeon_i2c_int_disable; + i2c->hlc_int_enable = octeon_i2c_hlc_int_enable; + i2c->hlc_int_disable = octeon_i2c_int_disable; + } + result = devm_request_irq(&pdev->dev, i2c->irq, octeon_i2c_isr, 0, DRV_NAME, i2c); if (result < 0) { @@ -544,6 +1189,9 @@ static int octeon_i2c_probe(struct platform_device *pdev) goto out; } + if (OCTEON_IS_MODEL(OCTEON_CN38XX)) + i2c->broken_irq_check = true; + result = octeon_i2c_init_lowlevel(i2c); if (result) { dev_err(i2c->dev, "init low level failed\n"); @@ -553,6 +1201,9 @@ static int octeon_i2c_probe(struct platform_device *pdev) octeon_i2c_set_clock(i2c); i2c->adap = octeon_i2c_ops; + i2c->adap.timeout = msecs_to_jiffies(2); + i2c->adap.retries = 5; + i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info; i2c->adap.dev.parent = &pdev->dev; i2c->adap.dev.of_node = node; i2c_set_adapdata(&i2c->adap, i2c); @@ -580,6 +1231,7 @@ static int octeon_i2c_remove(struct platform_device *pdev) static const struct of_device_id octeon_i2c_match[] = { { .compatible = "cavium,octeon-3860-twsi", }, + { .compatible = "cavium,octeon-7890-twsi", }, {}, }; MODULE_DEVICE_TABLE(of, octeon_i2c_match); diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 13c45296ce5b..ab1279b8e240 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -185,7 +185,6 @@ enum { #define OMAP_I2C_IP_V2_INTERRUPTS_MASK 0x6FFF struct omap_i2c_dev { - spinlock_t lock; /* IRQ synchronization */ struct device *dev; void __iomem *base; /* virtual */ int irq; @@ -995,15 +994,12 @@ omap_i2c_isr(int irq, void *dev_id) u16 mask; u16 stat; - spin_lock(&omap->lock); - mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG); stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG); + mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG); if (stat & mask) ret = IRQ_WAKE_THREAD; - spin_unlock(&omap->lock); - return ret; } @@ -1011,12 +1007,10 @@ static irqreturn_t omap_i2c_isr_thread(int this_irq, void *dev_id) { struct omap_i2c_dev *omap = dev_id; - unsigned long flags; u16 bits; u16 stat; int err = 0, count = 0; - spin_lock_irqsave(&omap->lock, flags); do { bits = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG); stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG); @@ -1142,8 +1136,6 @@ omap_i2c_isr_thread(int this_irq, void *dev_id) omap_i2c_complete_cmd(omap, err); out: - spin_unlock_irqrestore(&omap->lock, flags); - return IRQ_HANDLED; } @@ -1330,8 +1322,6 @@ omap_i2c_probe(struct platform_device *pdev) omap->dev = &pdev->dev; omap->irq = irq; - spin_lock_init(&omap->lock); - platform_set_drvdata(pdev, omap); init_completion(&omap->cmd_complete); diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c index 6abcf696e359..b0d9dee14a7e 100644 --- a/drivers/i2c/busses/i2c-powermac.c +++ b/drivers/i2c/busses/i2c-powermac.c @@ -150,13 +150,11 @@ static int i2c_powermac_master_xfer( struct i2c_adapter *adap, { struct pmac_i2c_bus *bus = i2c_get_adapdata(adap); int rc = 0; - int read; int addrdir; if (msgs->flags & I2C_M_TEN) return -EINVAL; - read = (msgs->flags & I2C_M_RD) != 0; - addrdir = (msgs->addr << 1) | read; + addrdir = i2c_8bit_addr_from_msg(msgs); rc = pmac_i2c_open(bus, 0); if (rc) { diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 23eaabb19f96..cc6439ab3f71 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -515,7 +515,7 @@ static int qup_i2c_get_data_len(struct qup_i2c_dev *qup) static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup, struct i2c_msg *msg, int is_dma) { - u16 addr = (msg->addr << 1) | ((msg->flags & I2C_M_RD) == I2C_M_RD); + u16 addr = i2c_8bit_addr_from_msg(msg); int len = 0; int data_len; diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 68ecb5630ad5..9aca1b4e2d8d 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -21,6 +21,8 @@ */ #include <linux/clk.h> #include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -43,6 +45,8 @@ #define ICSAR 0x1C /* slave address */ #define ICMAR 0x20 /* master address */ #define ICRXTX 0x24 /* data port */ +#define ICDMAER 0x3c /* DMA enable */ +#define ICFBSCR 0x38 /* first bit setup cycle */ /* ICSCR */ #define SDBS (1 << 3) /* slave data buffer select */ @@ -78,6 +82,16 @@ #define MDR (1 << 1) #define MAT (1 << 0) /* slave addr xfer done */ +/* ICDMAER */ +#define RSDMAE (1 << 3) /* DMA Slave Received Enable */ +#define TSDMAE (1 << 2) /* DMA Slave Transmitted Enable */ +#define RMDMAE (1 << 1) /* DMA Master Received Enable */ +#define TMDMAE (1 << 0) /* DMA Master Transmitted Enable */ + +/* ICFBSCR */ +#define TCYC06 0x04 /* 6*Tcyc delay 1st bit between SDA and SCL */ +#define TCYC17 0x0f /* 17*Tcyc delay 1st bit between SDA and SCL */ + #define RCAR_BUS_PHASE_START (MDBS | MIE | ESG) #define RCAR_BUS_PHASE_DATA (MDBS | MIE) @@ -120,6 +134,12 @@ struct rcar_i2c_priv { u32 flags; enum rcar_i2c_type devtype; struct i2c_client *slave; + + struct resource *res; + struct dma_chan *dma_tx; + struct dma_chan *dma_rx; + struct scatterlist sg; + enum dma_data_direction dma_direction; }; #define rcar_i2c_priv_to_dev(p) ((p)->adap.dev.parent) @@ -287,6 +307,118 @@ static void rcar_i2c_next_msg(struct rcar_i2c_priv *priv) /* * interrupt functions */ +static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv) +{ + struct dma_chan *chan = priv->dma_direction == DMA_FROM_DEVICE + ? priv->dma_rx : priv->dma_tx; + + /* Disable DMA Master Received/Transmitted */ + rcar_i2c_write(priv, ICDMAER, 0); + + /* Reset default delay */ + rcar_i2c_write(priv, ICFBSCR, TCYC06); + + dma_unmap_single(chan->device->dev, sg_dma_address(&priv->sg), + priv->msg->len, priv->dma_direction); + + priv->dma_direction = DMA_NONE; +} + +static void rcar_i2c_cleanup_dma(struct rcar_i2c_priv *priv) +{ + if (priv->dma_direction == DMA_NONE) + return; + else if (priv->dma_direction == DMA_FROM_DEVICE) + dmaengine_terminate_all(priv->dma_rx); + else if (priv->dma_direction == DMA_TO_DEVICE) + dmaengine_terminate_all(priv->dma_tx); + + rcar_i2c_dma_unmap(priv); +} + +static void rcar_i2c_dma_callback(void *data) +{ + struct rcar_i2c_priv *priv = data; + + priv->pos += sg_dma_len(&priv->sg); + + rcar_i2c_dma_unmap(priv); +} + +static void rcar_i2c_dma(struct rcar_i2c_priv *priv) +{ + struct device *dev = rcar_i2c_priv_to_dev(priv); + struct i2c_msg *msg = priv->msg; + bool read = msg->flags & I2C_M_RD; + enum dma_data_direction dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + struct dma_chan *chan = read ? priv->dma_rx : priv->dma_tx; + struct dma_async_tx_descriptor *txdesc; + dma_addr_t dma_addr; + dma_cookie_t cookie; + unsigned char *buf; + int len; + + /* Do not use DMA if it's not available or for messages < 8 bytes */ + if (IS_ERR(chan) || msg->len < 8) + return; + + if (read) { + /* + * The last two bytes needs to be fetched using PIO in + * order for the STOP phase to work. + */ + buf = priv->msg->buf; + len = priv->msg->len - 2; + } else { + /* + * First byte in message was sent using PIO. + */ + buf = priv->msg->buf + 1; + len = priv->msg->len - 1; + } + + dma_addr = dma_map_single(chan->device->dev, buf, len, dir); + if (dma_mapping_error(dev, dma_addr)) { + dev_dbg(dev, "dma map failed, using PIO\n"); + return; + } + + sg_dma_len(&priv->sg) = len; + sg_dma_address(&priv->sg) = dma_addr; + + priv->dma_direction = dir; + + txdesc = dmaengine_prep_slave_sg(chan, &priv->sg, 1, + read ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!txdesc) { + dev_dbg(dev, "dma prep slave sg failed, using PIO\n"); + rcar_i2c_cleanup_dma(priv); + return; + } + + txdesc->callback = rcar_i2c_dma_callback; + txdesc->callback_param = priv; + + cookie = dmaengine_submit(txdesc); + if (dma_submit_error(cookie)) { + dev_dbg(dev, "submitting dma failed, using PIO\n"); + rcar_i2c_cleanup_dma(priv); + return; + } + + /* Set delay for DMA operations */ + rcar_i2c_write(priv, ICFBSCR, TCYC17); + + /* Enable DMA Master Received/Transmitted */ + if (read) + rcar_i2c_write(priv, ICDMAER, RMDMAE); + else + rcar_i2c_write(priv, ICDMAER, TMDMAE); + + dma_async_issue_pending(chan); +} + static void rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) { struct i2c_msg *msg = priv->msg; @@ -306,6 +438,12 @@ static void rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) rcar_i2c_write(priv, ICRXTX, msg->buf[priv->pos]); priv->pos++; + /* + * Try to use DMA to transmit the rest of the data if + * address transfer pashe just finished. + */ + if (msr & MAT) + rcar_i2c_dma(priv); } else { /* * The last data was pushed to ICRXTX on _PREV_ empty irq. @@ -340,7 +478,11 @@ static void rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr) return; if (msr & MAT) { - /* Address transfer phase finished, but no data at this point. */ + /* + * Address transfer phase finished, but no data at this point. + * Try to use DMA to receive data. + */ + rcar_i2c_dma(priv); } else if (priv->pos < msg->len) { /* get received data */ msg->buf[priv->pos] = rcar_i2c_read(priv, ICRXTX); @@ -472,6 +614,81 @@ out: return IRQ_HANDLED; } +static struct dma_chan *rcar_i2c_request_dma_chan(struct device *dev, + enum dma_transfer_direction dir, + dma_addr_t port_addr) +{ + struct dma_chan *chan; + struct dma_slave_config cfg; + char *chan_name = dir == DMA_MEM_TO_DEV ? "tx" : "rx"; + int ret; + + chan = dma_request_slave_channel_reason(dev, chan_name); + if (IS_ERR(chan)) { + ret = PTR_ERR(chan); + dev_dbg(dev, "request_channel failed for %s (%d)\n", + chan_name, ret); + return chan; + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.direction = dir; + if (dir == DMA_MEM_TO_DEV) { + cfg.dst_addr = port_addr; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + } else { + cfg.src_addr = port_addr; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + } + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) { + dev_dbg(dev, "slave_config failed for %s (%d)\n", + chan_name, ret); + dma_release_channel(chan); + return ERR_PTR(ret); + } + + dev_dbg(dev, "got DMA channel for %s\n", chan_name); + return chan; +} + +static void rcar_i2c_request_dma(struct rcar_i2c_priv *priv, + struct i2c_msg *msg) +{ + struct device *dev = rcar_i2c_priv_to_dev(priv); + bool read; + struct dma_chan *chan; + enum dma_transfer_direction dir; + + read = msg->flags & I2C_M_RD; + + chan = read ? priv->dma_rx : priv->dma_tx; + if (PTR_ERR(chan) != -EPROBE_DEFER) + return; + + dir = read ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; + chan = rcar_i2c_request_dma_chan(dev, dir, priv->res->start + ICRXTX); + + if (read) + priv->dma_rx = chan; + else + priv->dma_tx = chan; +} + +static void rcar_i2c_release_dma(struct rcar_i2c_priv *priv) +{ + if (!IS_ERR(priv->dma_tx)) { + dma_release_channel(priv->dma_tx); + priv->dma_tx = ERR_PTR(-EPROBE_DEFER); + } + + if (!IS_ERR(priv->dma_rx)) { + dma_release_channel(priv->dma_rx); + priv->dma_rx = ERR_PTR(-EPROBE_DEFER); + } +} + static int rcar_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) @@ -493,6 +710,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, ret = -EOPNOTSUPP; goto out; } + rcar_i2c_request_dma(priv, msgs + i); } /* init first message */ @@ -504,6 +722,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, time_left = wait_event_timeout(priv->wait, priv->flags & ID_DONE, num * adap->timeout); if (!time_left) { + rcar_i2c_cleanup_dma(priv); rcar_i2c_init(priv); ret = -ETIMEDOUT; } else if (priv->flags & ID_NACK) { @@ -591,7 +810,6 @@ static int rcar_i2c_probe(struct platform_device *pdev) { struct rcar_i2c_priv *priv; struct i2c_adapter *adap; - struct resource *res; struct device *dev = &pdev->dev; struct i2c_timings i2c_t; int irq, ret; @@ -606,8 +824,9 @@ static int rcar_i2c_probe(struct platform_device *pdev) return PTR_ERR(priv->clk); } - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - priv->io = devm_ioremap_resource(dev, res); + priv->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + priv->io = devm_ioremap_resource(dev, priv->res); if (IS_ERR(priv->io)) return PTR_ERR(priv->io); @@ -626,6 +845,11 @@ static int rcar_i2c_probe(struct platform_device *pdev) i2c_parse_fw_timings(dev, &i2c_t, false); + /* Init DMA */ + sg_init_table(&priv->sg, 1); + priv->dma_direction = DMA_NONE; + priv->dma_rx = priv->dma_tx = ERR_PTR(-EPROBE_DEFER); + pm_runtime_enable(dev); pm_runtime_get_sync(dev); ret = rcar_i2c_clock_calculate(priv, &i2c_t); @@ -673,6 +897,7 @@ static int rcar_i2c_remove(struct platform_device *pdev) struct device *dev = &pdev->dev; i2c_del_adapter(&priv->adap); + rcar_i2c_release_dma(priv); if (priv->flags & ID_P_PM_BLOCKED) pm_runtime_put(dev); pm_runtime_disable(dev); diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 3dcc5f3f26cb..80bed02cd942 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -101,10 +101,7 @@ struct rk3x_i2c { struct notifier_block clk_rate_nb; /* Settings */ - unsigned int scl_frequency; - unsigned int scl_rise_ns; - unsigned int scl_fall_ns; - unsigned int sda_fall_ns; + struct i2c_timings t; /* Synchronization & notification */ spinlock_t lock; @@ -437,10 +434,7 @@ out: * Calculate divider values for desired SCL frequency * * @clk_rate: I2C input clock rate - * @scl_rate: Desired SCL rate - * @scl_rise_ns: How many ns it takes for SCL to rise. - * @scl_fall_ns: How many ns it takes for SCL to fall. - * @sda_fall_ns: How many ns it takes for SDA to fall. + * @t: Known I2C timing information. * @div_low: Divider output for low * @div_high: Divider output for high * @@ -448,11 +442,10 @@ out: * a best-effort divider value is returned in divs. If the target rate is * too high, we silently use the highest possible rate. */ -static int rk3x_i2c_calc_divs(unsigned long clk_rate, unsigned long scl_rate, - unsigned long scl_rise_ns, - unsigned long scl_fall_ns, - unsigned long sda_fall_ns, - unsigned long *div_low, unsigned long *div_high) +static int rk3x_i2c_calc_divs(unsigned long clk_rate, + struct i2c_timings *t, + unsigned long *div_low, + unsigned long *div_high) { unsigned long spec_min_low_ns, spec_min_high_ns; unsigned long spec_setup_start, spec_max_data_hold_ns; @@ -472,12 +465,12 @@ static int rk3x_i2c_calc_divs(unsigned long clk_rate, unsigned long scl_rate, int ret = 0; /* Only support standard-mode and fast-mode */ - if (WARN_ON(scl_rate > 400000)) - scl_rate = 400000; + if (WARN_ON(t->bus_freq_hz > 400000)) + t->bus_freq_hz = 400000; /* prevent scl_rate_khz from becoming 0 */ - if (WARN_ON(scl_rate < 1000)) - scl_rate = 1000; + if (WARN_ON(t->bus_freq_hz < 1000)) + t->bus_freq_hz = 1000; /* * min_low_ns: The minimum number of ns we need to hold low to @@ -491,7 +484,7 @@ static int rk3x_i2c_calc_divs(unsigned long clk_rate, unsigned long scl_rate, * This is because the i2c host on Rockchip holds the data line * for half the low time. */ - if (scl_rate <= 100000) { + if (t->bus_freq_hz <= 100000) { /* Standard-mode */ spec_min_low_ns = 4700; spec_setup_start = 4700; @@ -506,7 +499,7 @@ static int rk3x_i2c_calc_divs(unsigned long clk_rate, unsigned long scl_rate, spec_max_data_hold_ns = 900; data_hold_buffer_ns = 50; } - min_high_ns = scl_rise_ns + spec_min_high_ns; + min_high_ns = t->scl_rise_ns + spec_min_high_ns; /* * Timings for repeated start: @@ -517,18 +510,18 @@ static int rk3x_i2c_calc_divs(unsigned long clk_rate, unsigned long scl_rate, * we meet tSU;STA and tHD;STA times. */ min_high_ns = max(min_high_ns, - DIV_ROUND_UP((scl_rise_ns + spec_setup_start) * 1000, 875)); + DIV_ROUND_UP((t->scl_rise_ns + spec_setup_start) * 1000, 875)); min_high_ns = max(min_high_ns, - DIV_ROUND_UP((scl_rise_ns + spec_setup_start + - sda_fall_ns + spec_min_high_ns), 2)); + DIV_ROUND_UP((t->scl_rise_ns + spec_setup_start + + t->sda_fall_ns + spec_min_high_ns), 2)); - min_low_ns = scl_fall_ns + spec_min_low_ns; + min_low_ns = t->scl_fall_ns + spec_min_low_ns; max_low_ns = spec_max_data_hold_ns * 2 - data_hold_buffer_ns; min_total_ns = min_low_ns + min_high_ns; /* Adjust to avoid overflow */ clk_rate_khz = DIV_ROUND_UP(clk_rate, 1000); - scl_rate_khz = scl_rate / 1000; + scl_rate_khz = t->bus_freq_hz / 1000; /* * We need the total div to be >= this number @@ -616,14 +609,13 @@ static int rk3x_i2c_calc_divs(unsigned long clk_rate, unsigned long scl_rate, static void rk3x_i2c_adapt_div(struct rk3x_i2c *i2c, unsigned long clk_rate) { + struct i2c_timings *t = &i2c->t; unsigned long div_low, div_high; u64 t_low_ns, t_high_ns; int ret; - ret = rk3x_i2c_calc_divs(clk_rate, i2c->scl_frequency, i2c->scl_rise_ns, - i2c->scl_fall_ns, i2c->sda_fall_ns, - &div_low, &div_high); - WARN_ONCE(ret != 0, "Could not reach SCL freq %u", i2c->scl_frequency); + ret = rk3x_i2c_calc_divs(clk_rate, t, &div_low, &div_high); + WARN_ONCE(ret != 0, "Could not reach SCL freq %u", t->bus_freq_hz); clk_enable(i2c->clk); i2c_writel(i2c, (div_high << 16) | (div_low & 0xffff), REG_CLKDIV); @@ -634,7 +626,7 @@ static void rk3x_i2c_adapt_div(struct rk3x_i2c *i2c, unsigned long clk_rate) dev_dbg(i2c->dev, "CLK %lukhz, Req %uns, Act low %lluns high %lluns\n", clk_rate / 1000, - 1000000000 / i2c->scl_frequency, + 1000000000 / t->bus_freq_hz, t_low_ns, t_high_ns); } @@ -664,9 +656,7 @@ static int rk3x_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long switch (event) { case PRE_RATE_CHANGE: - if (rk3x_i2c_calc_divs(ndata->new_rate, i2c->scl_frequency, - i2c->scl_rise_ns, i2c->scl_fall_ns, - i2c->sda_fall_ns, + if (rk3x_i2c_calc_divs(ndata->new_rate, &i2c->t, &div_low, &div_high) != 0) return NOTIFY_STOP; @@ -880,37 +870,8 @@ static int rk3x_i2c_probe(struct platform_device *pdev) match = of_match_node(rk3x_i2c_match, np); i2c->soc_data = (struct rk3x_i2c_soc_data *)match->data; - if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", - &i2c->scl_frequency)) { - dev_info(&pdev->dev, "using default SCL frequency: %d\n", - DEFAULT_SCL_RATE); - i2c->scl_frequency = DEFAULT_SCL_RATE; - } - - if (i2c->scl_frequency == 0 || i2c->scl_frequency > 400 * 1000) { - dev_warn(&pdev->dev, "invalid SCL frequency specified.\n"); - dev_warn(&pdev->dev, "using default SCL frequency: %d\n", - DEFAULT_SCL_RATE); - i2c->scl_frequency = DEFAULT_SCL_RATE; - } - - /* - * Read rise and fall time from device tree. If not available use - * the default maximum timing from the specification. - */ - if (of_property_read_u32(pdev->dev.of_node, "i2c-scl-rising-time-ns", - &i2c->scl_rise_ns)) { - if (i2c->scl_frequency <= 100000) - i2c->scl_rise_ns = 1000; - else - i2c->scl_rise_ns = 300; - } - if (of_property_read_u32(pdev->dev.of_node, "i2c-scl-falling-time-ns", - &i2c->scl_fall_ns)) - i2c->scl_fall_ns = 300; - if (of_property_read_u32(pdev->dev.of_node, "i2c-sda-falling-time-ns", - &i2c->sda_fall_ns)) - i2c->sda_fall_ns = i2c->scl_fall_ns; + /* use common interface to get I2C timing properties */ + i2c_parse_fw_timings(&pdev->dev, &i2c->t, true); strlcpy(i2c->adap.name, "rk3x-i2c", sizeof(i2c->adap.name)); i2c->adap.owner = THIS_MODULE; diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index 362a6de54833..38dc1cacfd8b 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -163,15 +163,14 @@ static const struct of_device_id s3c24xx_i2c_match[] = { MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match); #endif -/* s3c24xx_get_device_quirks - * +/* * Get controller type either from device tree or platform device variant. -*/ - + */ static inline kernel_ulong_t s3c24xx_get_device_quirks(struct platform_device *pdev) { if (pdev->dev.of_node) { const struct of_device_id *match; + match = of_match_node(s3c24xx_i2c_match, pdev->dev.of_node); return (kernel_ulong_t)match->data; } @@ -179,12 +178,10 @@ static inline kernel_ulong_t s3c24xx_get_device_quirks(struct platform_device *p return platform_get_device_id(pdev)->driver_data; } -/* s3c24xx_i2c_master_complete - * - * complete the message and wake up the caller, using the given return code, +/* + * Complete the message and wake up the caller, using the given return code, * or zero to mean ok. -*/ - + */ static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret) { dev_dbg(i2c->dev, "master_complete %d\n", ret); @@ -217,7 +214,6 @@ static inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c) } /* irq enable/disable functions */ - static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c) { unsigned long tmp; @@ -251,11 +247,9 @@ static bool is_ack(struct s3c24xx_i2c *i2c) return false; } -/* s3c24xx_i2c_message_start - * +/* * put the start of a message onto the bus -*/ - + */ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, struct i2c_msg *msg) { @@ -284,9 +278,10 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr); writeb(addr, i2c->regs + S3C2410_IICDS); - /* delay here to ensure the data byte has gotten onto the bus - * before the transaction is started */ - + /* + * delay here to ensure the data byte has gotten onto the bus + * before the transaction is started + */ ndelay(i2c->tx_setup); dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon); @@ -361,50 +356,46 @@ static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret) s3c24xx_i2c_disable_irq(i2c); } -/* helper functions to determine the current state in the set of - * messages we are sending */ +/* + * helper functions to determine the current state in the set of + * messages we are sending + */ -/* is_lastmsg() - * +/* * returns TRUE if the current message is the last in the set -*/ - + */ static inline int is_lastmsg(struct s3c24xx_i2c *i2c) { return i2c->msg_idx >= (i2c->msg_num - 1); } -/* is_msglast - * +/* * returns TRUE if we this is the last byte in the current message -*/ - + */ static inline int is_msglast(struct s3c24xx_i2c *i2c) { - /* msg->len is always 1 for the first byte of smbus block read. + /* + * msg->len is always 1 for the first byte of smbus block read. * Actual length will be read from slave. More bytes will be - * read according to the length then. */ + * read according to the length then. + */ if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1) return 0; return i2c->msg_ptr == i2c->msg->len-1; } -/* is_msgend - * +/* * returns TRUE if we reached the end of the current message -*/ - + */ static inline int is_msgend(struct s3c24xx_i2c *i2c) { return i2c->msg_ptr >= i2c->msg->len; } -/* i2c_s3c_irq_nextbyte - * +/* * process an interrupt and work out what to do */ - static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) { unsigned long tmp; @@ -423,14 +414,13 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) goto out_ack; case STATE_START: - /* last thing we did was send a start condition on the + /* + * last thing we did was send a start condition on the * bus, or started a new i2c message */ - if (iicstat & S3C2410_IICSTAT_LASTBIT && !(i2c->msg->flags & I2C_M_IGNORE_NAK)) { /* ack was not received... */ - dev_dbg(i2c->dev, "ack was not received\n"); s3c24xx_i2c_stop(i2c, -ENXIO); goto out_ack; @@ -441,9 +431,10 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) else i2c->state = STATE_WRITE; - /* terminate the transfer if there is nothing to do - * as this is used by the i2c probe to find devices. */ - + /* + * Terminate the transfer if there is nothing to do + * as this is used by the i2c probe to find devices. + */ if (is_lastmsg(i2c) && i2c->msg->len == 0) { s3c24xx_i2c_stop(i2c, 0); goto out_ack; @@ -452,14 +443,16 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) if (i2c->state == STATE_READ) goto prepare_read; - /* fall through to the write state, as we will need to - * send a byte as well */ + /* + * fall through to the write state, as we will need to + * send a byte as well + */ case STATE_WRITE: - /* we are writing data to the device... check for the + /* + * we are writing data to the device... check for the * end of the message, and if so, work out what to do */ - if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) { if (iicstat & S3C2410_IICSTAT_LASTBIT) { dev_dbg(i2c->dev, "WRITE: No Ack\n"); @@ -475,12 +468,13 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) byte = i2c->msg->buf[i2c->msg_ptr++]; writeb(byte, i2c->regs + S3C2410_IICDS); - /* delay after writing the byte to allow the + /* + * delay after writing the byte to allow the * data setup time on the bus, as writing the * data to the register causes the first bit * to appear on SDA, and SCL will change as - * soon as the interrupt is acknowledged */ - + * soon as the interrupt is acknowledged + */ ndelay(i2c->tx_setup); } else if (!is_lastmsg(i2c)) { @@ -496,10 +490,11 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) if (i2c->msg->flags & I2C_M_NOSTART) { if (i2c->msg->flags & I2C_M_RD) { - /* cannot do this, the controller + /* + * cannot do this, the controller * forces us to send a new START - * when we change direction */ - + * when we change direction + */ s3c24xx_i2c_stop(i2c, -EINVAL); } @@ -512,17 +507,16 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) } else { /* send stop */ - s3c24xx_i2c_stop(i2c, 0); } break; case STATE_READ: - /* we have a byte of data in the data register, do + /* + * we have a byte of data in the data register, do * something with it, and then work out whether we are * going to do any more read/write */ - byte = readb(i2c->regs + S3C2410_IICDS); i2c->msg->buf[i2c->msg_ptr++] = byte; @@ -537,9 +531,10 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) s3c24xx_i2c_disable_ack(i2c); } else if (is_msgend(i2c)) { - /* ok, we've read the entire buffer, see if there - * is anything else we need to do */ - + /* + * ok, we've read the entire buffer, see if there + * is anything else we need to do + */ if (is_lastmsg(i2c)) { /* last message, send stop and complete */ dev_dbg(i2c->dev, "READ: Send Stop\n"); @@ -568,11 +563,9 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) return ret; } -/* s3c24xx_i2c_irq - * +/* * top level IRQ servicing routine -*/ - + */ static irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id) { struct s3c24xx_i2c *i2c = dev_id; @@ -595,9 +588,10 @@ static irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id) goto out; } - /* pretty much this leaves us with the fact that we've - * transmitted or received whatever byte we last sent */ - + /* + * pretty much this leaves us with the fact that we've + * transmitted or received whatever byte we last sent + */ i2c_s3c_irq_nextbyte(i2c, status); out: @@ -630,11 +624,9 @@ static inline void s3c24xx_i2c_disable_bus(struct s3c24xx_i2c *i2c) } -/* s3c24xx_i2c_set_master - * +/* * get the i2c bus for a master transaction -*/ - + */ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c) { unsigned long iicstat; @@ -652,11 +644,9 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c) return -ETIMEDOUT; } -/* s3c24xx_i2c_wait_idle - * +/* * wait for the i2c bus to become idle. -*/ - + */ static void s3c24xx_i2c_wait_idle(struct s3c24xx_i2c *i2c) { unsigned long iicstat; @@ -706,11 +696,9 @@ static void s3c24xx_i2c_wait_idle(struct s3c24xx_i2c *i2c) dev_warn(i2c->dev, "timeout waiting for bus idle\n"); } -/* s3c24xx_i2c_doxfer - * +/* * this starts an i2c transfer -*/ - + */ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int num) { @@ -749,9 +737,10 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, ret = i2c->msg_idx; - /* having these next two as dev_err() makes life very - * noisy when doing an i2cdetect */ - + /* + * Having these next two as dev_err() makes life very + * noisy when doing an i2cdetect + */ if (timeout == 0) dev_dbg(i2c->dev, "timeout\n"); else if (ret != num) @@ -771,12 +760,10 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, return ret; } -/* s3c24xx_i2c_xfer - * +/* * first port of call from the i2c bus code when an message needs * transferring across the i2c bus. -*/ - + */ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { @@ -814,17 +801,14 @@ static u32 s3c24xx_i2c_func(struct i2c_adapter *adap) } /* i2c bus registration info */ - static const struct i2c_algorithm s3c24xx_i2c_algorithm = { .master_xfer = s3c24xx_i2c_xfer, .functionality = s3c24xx_i2c_func, }; -/* s3c24xx_i2c_calcdivisor - * +/* * return the divisor settings for a given frequency -*/ - + */ static int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted, unsigned int *div1, unsigned int *divs) { @@ -850,13 +834,11 @@ static int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted, return clkin / (calc_divs * calc_div1); } -/* s3c24xx_i2c_clockrate - * +/* * work out a divisor for the user requested frequency setting, * either by the requested frequency, or scanning the acceptable * range of frequencies until something is found -*/ - + */ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got) { struct s3c2410_platform_i2c *pdata = i2c->pdata; @@ -944,7 +926,7 @@ static int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb, i2c_unlock_adapter(&i2c->adap); if (ret < 0) - dev_err(i2c->dev, "cannot find frequency\n"); + dev_err(i2c->dev, "cannot find frequency (%d)\n", ret); else dev_info(i2c->dev, "setting freq %d\n", got); } @@ -995,7 +977,8 @@ static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) ret = gpio_request(gpio, "i2c-bus"); if (ret) { - dev_err(i2c->dev, "gpio [%d] request failed\n", gpio); + dev_err(i2c->dev, "gpio [%d] request failed (%d)\n", + gpio, ret); goto free_gpio; } } @@ -1028,11 +1011,9 @@ static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) } #endif -/* s3c24xx_i2c_init - * +/* * initialise the controller, set the IO lines and frequency -*/ - + */ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c) { struct s3c2410_platform_i2c *pdata; @@ -1068,11 +1049,9 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c) } #ifdef CONFIG_OF -/* s3c24xx_i2c_parse_dt - * +/* * Parse the device tree node and retreive the platform data. -*/ - + */ static void s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) { @@ -1105,17 +1084,9 @@ s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) } #else static void -s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) -{ - return; -} +s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) { } #endif -/* s3c24xx_i2c_probe - * - * called by the bus driver when a suitable device is found -*/ - static int s3c24xx_i2c_probe(struct platform_device *pdev) { struct s3c24xx_i2c *i2c; @@ -1156,7 +1127,6 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev) init_waitqueue_head(&i2c->wait); /* find the clock and enable it */ - i2c->dev = &pdev->dev; i2c->clk = devm_clk_get(&pdev->dev, "i2c"); if (IS_ERR(i2c->clk)) { @@ -1166,9 +1136,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk); - /* map the registers */ - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); i2c->regs = devm_ioremap_resource(&pdev->dev, res); @@ -1179,33 +1147,35 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev) i2c->regs, res); /* setup info block for the i2c core */ - i2c->adap.algo_data = i2c; i2c->adap.dev.parent = &pdev->dev; - i2c->pctrl = devm_pinctrl_get_select_default(i2c->dev); /* inititalise the i2c gpio lines */ - - if (i2c->pdata->cfg_gpio) { + if (i2c->pdata->cfg_gpio) i2c->pdata->cfg_gpio(to_platform_device(i2c->dev)); - } else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c)) { + else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c)) return -EINVAL; - } /* initialise the i2c controller */ + ret = clk_prepare_enable(i2c->clk); + if (ret) { + dev_err(&pdev->dev, "I2C clock enable failed\n"); + return ret; + } - clk_prepare_enable(i2c->clk); ret = s3c24xx_i2c_init(i2c); clk_disable(i2c->clk); if (ret != 0) { dev_err(&pdev->dev, "I2C controller init failed\n"); + clk_unprepare(i2c->clk); return ret; } - /* find the IRQ for this unit (note, this relies on the init call to + + /* + * find the IRQ for this unit (note, this relies on the init call to * ensure no current IRQs pending */ - if (!(i2c->quirks & QUIRK_POLL)) { i2c->irq = ret = platform_get_irq(pdev, 0); if (ret <= 0) { @@ -1214,9 +1184,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev) return ret; } - ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, 0, - dev_name(&pdev->dev), i2c); - + ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, + 0, dev_name(&pdev->dev), i2c); if (ret != 0) { dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq); clk_unprepare(i2c->clk); @@ -1231,12 +1200,12 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev) return ret; } - /* Note, previous versions of the driver used i2c_add_adapter() + /* + * Note, previous versions of the driver used i2c_add_adapter() * to add the bus at any number. We now pass the bus number via * the platform data, so if unset it will now default to always * being bus 0. */ - i2c->adap.nr = i2c->pdata->bus_num; i2c->adap.dev.of_node = pdev->dev.of_node; @@ -1257,11 +1226,6 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev) return 0; } -/* s3c24xx_i2c_remove - * - * called when device is removed from the bus -*/ - static int s3c24xx_i2c_remove(struct platform_device *pdev) { struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); @@ -1316,14 +1280,8 @@ static int s3c24xx_i2c_resume_noirq(struct device *dev) #ifdef CONFIG_PM static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = { -#ifdef CONFIG_PM_SLEEP - .suspend_noirq = s3c24xx_i2c_suspend_noirq, - .resume_noirq = s3c24xx_i2c_resume_noirq, - .freeze_noirq = s3c24xx_i2c_suspend_noirq, - .thaw_noirq = s3c24xx_i2c_resume_noirq, - .poweroff_noirq = s3c24xx_i2c_suspend_noirq, - .restore_noirq = s3c24xx_i2c_resume_noirq, -#endif + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(s3c24xx_i2c_suspend_noirq, + s3c24xx_i2c_resume_noirq) }; #define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops) @@ -1331,8 +1289,6 @@ static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = { #define S3C24XX_DEV_PM_OPS NULL #endif -/* device driver for platform bus bits */ - static struct platform_driver s3c24xx_i2c_driver = { .probe = s3c24xx_i2c_probe, .remove = s3c24xx_i2c_remove, diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index 7d2bd3ec2d2d..6fb3e2645992 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -398,8 +398,7 @@ static void sh_mobile_i2c_get_data(struct sh_mobile_i2c_data *pd, { switch (pd->pos) { case -1: - *buf = (pd->msg->addr & 0x7f) << 1; - *buf |= (pd->msg->flags & I2C_M_RD) ? 1 : 0; + *buf = i2c_8bit_addr_from_msg(pd->msg); break; default: *buf = pd->msg->buf[pd->pos]; diff --git a/drivers/i2c/busses/i2c-sirf.c b/drivers/i2c/busses/i2c-sirf.c index 13e51ef6af73..792a42bdd335 100644 --- a/drivers/i2c/busses/i2c-sirf.c +++ b/drivers/i2c/busses/i2c-sirf.c @@ -190,9 +190,7 @@ static void i2c_sirfsoc_set_address(struct sirfsoc_i2c *siic, writel(regval, siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++)); - addr = msg->addr << 1; /* Generate address */ - if (msg->flags & I2C_M_RD) - addr |= 1; + addr = i2c_8bit_addr_from_msg(msg); /* Reverse direction bit */ if (msg->flags & I2C_M_REV_DIR_ADDR) diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c index 6ee77159ac57..944ec4205084 100644 --- a/drivers/i2c/busses/i2c-st.c +++ b/drivers/i2c/busses/i2c-st.c @@ -337,10 +337,42 @@ static void st_i2c_hw_config(struct st_i2c_dev *i2c_dev) writel_relaxed(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH_DATAOUT); } +static int st_i2c_recover_bus(struct i2c_adapter *i2c_adap) +{ + struct st_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap); + u32 ctl; + + dev_dbg(i2c_dev->dev, "Trying to recover bus\n"); + + /* + * SSP IP is dual role SPI/I2C to generate 9 clock pulses + * we switch to SPI node, 9 bit words and write a 0. This + * has been validate with a oscilloscope and is easier + * than switching to GPIO mode. + */ + + /* Disable interrupts */ + writel_relaxed(0, i2c_dev->base + SSC_IEN); + + st_i2c_hw_config(i2c_dev); + + ctl = SSC_CTL_EN | SSC_CTL_MS | SSC_CTL_EN_RX_FIFO | SSC_CTL_EN_TX_FIFO; + st_i2c_set_bits(i2c_dev->base + SSC_CTL, ctl); + + st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_I2CM); + usleep_range(8000, 10000); + + writel_relaxed(0, i2c_dev->base + SSC_TBUF); + usleep_range(2000, 4000); + st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_I2CM); + + return 0; +} + static int st_i2c_wait_free_bus(struct st_i2c_dev *i2c_dev) { u32 sta; - int i; + int i, ret; for (i = 0; i < 10; i++) { sta = readl_relaxed(i2c_dev->base + SSC_STA); @@ -352,6 +384,12 @@ static int st_i2c_wait_free_bus(struct st_i2c_dev *i2c_dev) dev_err(i2c_dev->dev, "bus not free (status = 0x%08x)\n", sta); + ret = i2c_recover_bus(&i2c_dev->adap); + if (ret) { + dev_err(i2c_dev->dev, "Failed to recover the bus (%d)\n", ret); + return ret; + } + return -EBUSY; } @@ -614,8 +652,7 @@ static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg, unsigned long timeout; int ret; - c->addr = (u8)(msg->addr << 1); - c->addr |= (msg->flags & I2C_M_RD); + c->addr = i2c_8bit_addr_from_msg(msg); c->buf = msg->buf; c->count = msg->len; c->xfered = 0; @@ -744,6 +781,10 @@ static struct i2c_algorithm st_i2c_algo = { .functionality = st_i2c_func, }; +static struct i2c_bus_recovery_info st_i2c_recovery_info = { + .recover_bus = st_i2c_recover_bus, +}; + static int st_i2c_of_get_deglitch(struct device_node *np, struct st_i2c_dev *i2c_dev) { @@ -826,6 +867,7 @@ static int st_i2c_probe(struct platform_device *pdev) adap->timeout = 2 * HZ; adap->retries = 0; adap->algo = &st_i2c_algo; + adap->bus_recovery_info = &st_i2c_recovery_info; adap->dev.parent = &pdev->dev; adap->dev.of_node = pdev->dev.of_node; diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 929185a7296c..445398c314a3 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -38,6 +38,7 @@ #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 #define I2C_CNFG_PACKET_MODE_EN (1<<10) #define I2C_CNFG_NEW_MASTER_FSM (1<<11) +#define I2C_CNFG_MULTI_MASTER_MODE (1<<17) #define I2C_STATUS 0x01C #define I2C_SL_CNFG 0x020 #define I2C_SL_CNFG_NACK (1<<1) @@ -106,6 +107,9 @@ #define I2C_SLV_CONFIG_LOAD (1 << 1) #define I2C_TIMEOUT_CONFIG_LOAD (1 << 2) +#define I2C_CLKEN_OVERRIDE 0x090 +#define I2C_MST_CORE_CLKEN_OVR (1 << 0) + /* * msg_end_type: The bus control which need to be send at end of transfer. * @MSG_END_STOP: Send stop pulse at end of transfer. @@ -143,6 +147,8 @@ struct tegra_i2c_hw_feature { int clk_divisor_hs_mode; int clk_divisor_std_fast_mode; u16 clk_divisor_fast_plus_mode; + bool has_multi_master_mode; + bool has_slcg_override_reg; }; /** @@ -184,6 +190,7 @@ struct tegra_i2c_dev { u32 bus_clk_rate; u16 clk_divisor_non_hs_mode; bool is_suspended; + bool is_multimaster_mode; }; static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg) @@ -438,6 +445,10 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) val = I2C_CNFG_NEW_MASTER_FSM | I2C_CNFG_PACKET_MODE_EN | (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); + + if (i2c_dev->hw->has_multi_master_mode) + val |= I2C_CNFG_MULTI_MASTER_MODE; + i2c_writel(i2c_dev, val, I2C_CNFG); i2c_writel(i2c_dev, 0, I2C_INT_MASK); @@ -463,25 +474,29 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) if (tegra_i2c_flush_fifos(i2c_dev)) err = -ETIMEDOUT; + if (i2c_dev->is_multimaster_mode && i2c_dev->hw->has_slcg_override_reg) + i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE); + if (i2c_dev->hw->has_config_load_reg) { i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD); while (i2c_readl(i2c_dev, I2C_CONFIG_LOAD) != 0) { if (time_after(jiffies, timeout)) { dev_warn(i2c_dev->dev, "timeout waiting for config load\n"); - return -ETIMEDOUT; + err = -ETIMEDOUT; + goto err; } msleep(1); } } - tegra_i2c_clock_disable(i2c_dev); - if (i2c_dev->irq_disabled) { i2c_dev->irq_disabled = 0; enable_irq(i2c_dev->irq); } +err: + tegra_i2c_clock_disable(i2c_dev); return err; } @@ -688,6 +703,20 @@ static u32 tegra_i2c_func(struct i2c_adapter *adap) return ret; } +static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev) +{ + struct device_node *np = i2c_dev->dev->of_node; + int ret; + + ret = of_property_read_u32(np, "clock-frequency", + &i2c_dev->bus_clk_rate); + if (ret) + i2c_dev->bus_clk_rate = 100000; /* default clock rate */ + + i2c_dev->is_multimaster_mode = of_property_read_bool(np, + "multi-master"); +} + static const struct i2c_algorithm tegra_i2c_algo = { .master_xfer = tegra_i2c_xfer, .functionality = tegra_i2c_func, @@ -707,6 +736,8 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = { .clk_divisor_std_fast_mode = 0, .clk_divisor_fast_plus_mode = 0, .has_config_load_reg = false, + .has_multi_master_mode = false, + .has_slcg_override_reg = false, }; static const struct tegra_i2c_hw_feature tegra30_i2c_hw = { @@ -717,6 +748,8 @@ static const struct tegra_i2c_hw_feature tegra30_i2c_hw = { .clk_divisor_std_fast_mode = 0, .clk_divisor_fast_plus_mode = 0, .has_config_load_reg = false, + .has_multi_master_mode = false, + .has_slcg_override_reg = false, }; static const struct tegra_i2c_hw_feature tegra114_i2c_hw = { @@ -727,6 +760,8 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = { .clk_divisor_std_fast_mode = 0x19, .clk_divisor_fast_plus_mode = 0x10, .has_config_load_reg = false, + .has_multi_master_mode = false, + .has_slcg_override_reg = false, }; static const struct tegra_i2c_hw_feature tegra124_i2c_hw = { @@ -737,10 +772,25 @@ static const struct tegra_i2c_hw_feature tegra124_i2c_hw = { .clk_divisor_std_fast_mode = 0x19, .clk_divisor_fast_plus_mode = 0x10, .has_config_load_reg = true, + .has_multi_master_mode = false, + .has_slcg_override_reg = true, +}; + +static const struct tegra_i2c_hw_feature tegra210_i2c_hw = { + .has_continue_xfer_support = true, + .has_per_pkt_xfer_complete_irq = true, + .has_single_clk_source = true, + .clk_divisor_hs_mode = 1, + .clk_divisor_std_fast_mode = 0x19, + .clk_divisor_fast_plus_mode = 0x10, + .has_config_load_reg = true, + .has_multi_master_mode = true, + .has_slcg_override_reg = true, }; /* Match table for of_platform binding */ static const struct of_device_id tegra_i2c_of_match[] = { + { .compatible = "nvidia,tegra210-i2c", .data = &tegra210_i2c_hw, }, { .compatible = "nvidia,tegra124-i2c", .data = &tegra124_i2c_hw, }, { .compatible = "nvidia,tegra114-i2c", .data = &tegra114_i2c_hw, }, { .compatible = "nvidia,tegra30-i2c", .data = &tegra30_i2c_hw, }, @@ -797,10 +847,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) return PTR_ERR(i2c_dev->rst); } - ret = of_property_read_u32(i2c_dev->dev->of_node, "clock-frequency", - &i2c_dev->bus_clk_rate); - if (ret) - i2c_dev->bus_clk_rate = 100000; /* default clock rate */ + tegra_i2c_parse_dt(i2c_dev); i2c_dev->hw = &tegra20_i2c_hw; @@ -853,6 +900,15 @@ static int tegra_i2c_probe(struct platform_device *pdev) goto unprepare_fast_clk; } + if (i2c_dev->is_multimaster_mode) { + ret = clk_enable(i2c_dev->div_clk); + if (ret < 0) { + dev_err(i2c_dev->dev, "div_clk enable failed %d\n", + ret); + goto unprepare_div_clk; + } + } + ret = tegra_i2c_init(i2c_dev); if (ret) { dev_err(&pdev->dev, "Failed to initialize i2c controller"); @@ -863,7 +919,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) tegra_i2c_isr, 0, dev_name(&pdev->dev), i2c_dev); if (ret) { dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq); - goto unprepare_div_clk; + goto disable_div_clk; } i2c_set_adapdata(&i2c_dev->adapter, i2c_dev); @@ -878,11 +934,15 @@ static int tegra_i2c_probe(struct platform_device *pdev) ret = i2c_add_numbered_adapter(&i2c_dev->adapter); if (ret) { dev_err(&pdev->dev, "Failed to add I2C adapter\n"); - goto unprepare_div_clk; + goto disable_div_clk; } return 0; +disable_div_clk: + if (i2c_dev->is_multimaster_mode) + clk_disable(i2c_dev->div_clk); + unprepare_div_clk: clk_unprepare(i2c_dev->div_clk); @@ -898,6 +958,9 @@ static int tegra_i2c_remove(struct platform_device *pdev) struct tegra_i2c_dev *i2c_dev = platform_get_drvdata(pdev); i2c_del_adapter(&i2c_dev->adapter); + if (i2c_dev->is_multimaster_mode) + clk_disable(i2c_dev->div_clk); + clk_unprepare(i2c_dev->div_clk); if (!i2c_dev->hw->has_single_clk_source) clk_unprepare(i2c_dev->fast_clk); diff --git a/drivers/i2c/busses/i2c-uniphier-f.c b/drivers/i2c/busses/i2c-uniphier-f.c index 213ba55e17c3..aeead0d27d10 100644 --- a/drivers/i2c/busses/i2c-uniphier-f.c +++ b/drivers/i2c/busses/i2c-uniphier-f.c @@ -524,7 +524,7 @@ static int uniphier_fi2c_probe(struct platform_device *pdev) irq = platform_get_irq(pdev, 0); if (irq < 0) { - dev_err(dev, "failed to get IRQ number"); + dev_err(dev, "failed to get IRQ number\n"); return irq; } diff --git a/drivers/i2c/busses/i2c-uniphier.c b/drivers/i2c/busses/i2c-uniphier.c index 89eaa8a7e1e0..475a5eb514e2 100644 --- a/drivers/i2c/busses/i2c-uniphier.c +++ b/drivers/i2c/busses/i2c-uniphier.c @@ -381,7 +381,7 @@ static int uniphier_i2c_probe(struct platform_device *pdev) irq = platform_get_irq(pdev, 0); if (irq < 0) { - dev_err(dev, "failed to get IRQ number"); + dev_err(dev, "failed to get IRQ number\n"); return irq; } diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index e584d88ee337..af11b658984d 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -954,48 +954,40 @@ static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr) } /** - * i2c_lock_adapter - Get exclusive access to an I2C bus segment + * i2c_adapter_lock_bus - Get exclusive access to an I2C bus segment * @adapter: Target I2C bus segment + * @flags: I2C_LOCK_ROOT_ADAPTER locks the root i2c adapter, I2C_LOCK_SEGMENT + * locks only this branch in the adapter tree */ -void i2c_lock_adapter(struct i2c_adapter *adapter) +static void i2c_adapter_lock_bus(struct i2c_adapter *adapter, + unsigned int flags) { - struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); - - if (parent) - i2c_lock_adapter(parent); - else - rt_mutex_lock(&adapter->bus_lock); + rt_mutex_lock(&adapter->bus_lock); } -EXPORT_SYMBOL_GPL(i2c_lock_adapter); /** - * i2c_trylock_adapter - Try to get exclusive access to an I2C bus segment + * i2c_adapter_trylock_bus - Try to get exclusive access to an I2C bus segment * @adapter: Target I2C bus segment + * @flags: I2C_LOCK_ROOT_ADAPTER trylocks the root i2c adapter, I2C_LOCK_SEGMENT + * trylocks only this branch in the adapter tree */ -static int i2c_trylock_adapter(struct i2c_adapter *adapter) +static int i2c_adapter_trylock_bus(struct i2c_adapter *adapter, + unsigned int flags) { - struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); - - if (parent) - return i2c_trylock_adapter(parent); - else - return rt_mutex_trylock(&adapter->bus_lock); + return rt_mutex_trylock(&adapter->bus_lock); } /** - * i2c_unlock_adapter - Release exclusive access to an I2C bus segment + * i2c_adapter_unlock_bus - Release exclusive access to an I2C bus segment * @adapter: Target I2C bus segment + * @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT + * unlocks only this branch in the adapter tree */ -void i2c_unlock_adapter(struct i2c_adapter *adapter) +static void i2c_adapter_unlock_bus(struct i2c_adapter *adapter, + unsigned int flags) { - struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); - - if (parent) - i2c_unlock_adapter(parent); - else - rt_mutex_unlock(&adapter->bus_lock); + rt_mutex_unlock(&adapter->bus_lock); } -EXPORT_SYMBOL_GPL(i2c_unlock_adapter); static void i2c_dev_set_name(struct i2c_adapter *adap, struct i2c_client *client) @@ -1541,7 +1533,14 @@ static int i2c_register_adapter(struct i2c_adapter *adap) return -EINVAL; } + if (!adap->lock_bus) { + adap->lock_bus = i2c_adapter_lock_bus; + adap->trylock_bus = i2c_adapter_trylock_bus; + adap->unlock_bus = i2c_adapter_unlock_bus; + } + rt_mutex_init(&adap->bus_lock); + rt_mutex_init(&adap->mux_lock); mutex_init(&adap->userspace_clients_lock); INIT_LIST_HEAD(&adap->userspace_clients); @@ -1559,6 +1558,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap) dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); pm_runtime_no_callbacks(&adap->dev); + pm_suspend_ignore_children(&adap->dev, true); pm_runtime_enable(&adap->dev); #ifdef CONFIG_I2C_COMPAT @@ -1594,10 +1594,12 @@ static int i2c_register_adapter(struct i2c_adapter *adap) bri->get_scl = get_scl_gpio_value; bri->set_scl = set_scl_gpio_value; - } else if (!bri->set_scl || !bri->get_scl) { + } else if (bri->recover_bus == i2c_generic_scl_recovery) { /* Generic SCL recovery */ - dev_err(&adap->dev, "No {get|set}_gpio() found, not using recovery\n"); - adap->bus_recovery_info = NULL; + if (!bri->set_scl || !bri->get_scl) { + dev_err(&adap->dev, "No {get|set}_scl() found, not using recovery\n"); + adap->bus_recovery_info = NULL; + } } } @@ -2309,16 +2311,16 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) #endif if (in_atomic() || irqs_disabled()) { - ret = i2c_trylock_adapter(adap); + ret = adap->trylock_bus(adap, I2C_LOCK_SEGMENT); if (!ret) /* I2C activity is ongoing. */ return -EAGAIN; } else { - i2c_lock_adapter(adap); + i2c_lock_bus(adap, I2C_LOCK_SEGMENT); } ret = __i2c_transfer(adap, msgs, num); - i2c_unlock_adapter(adap); + i2c_unlock_bus(adap, I2C_LOCK_SEGMENT); return ret; } else { @@ -2646,7 +2648,7 @@ static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) static u8 i2c_smbus_msg_pec(u8 pec, struct i2c_msg *msg) { /* The address will be sent first */ - u8 addr = (msg->addr << 1) | !!(msg->flags & I2C_M_RD); + u8 addr = i2c_8bit_addr_from_msg(msg); pec = i2c_smbus_pec(pec, &addr, 1); /* The data buffer follows */ @@ -3093,7 +3095,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags, flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB; if (adapter->algo->smbus_xfer) { - i2c_lock_adapter(adapter); + i2c_lock_bus(adapter, I2C_LOCK_SEGMENT); /* Retry automatically on arbitration loss */ orig_jiffies = jiffies; @@ -3107,7 +3109,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags, orig_jiffies + adapter->timeout)) break; } - i2c_unlock_adapter(adapter); + i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT); if (res != -EOPNOTSUPP || !adapter->algo->master_xfer) goto trace; diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c index d4022878b2f0..8eee98634cda 100644 --- a/drivers/i2c/i2c-mux.c +++ b/drivers/i2c/i2c-mux.c @@ -31,30 +31,66 @@ struct i2c_mux_priv { struct i2c_adapter adap; struct i2c_algorithm algo; - - struct i2c_adapter *parent; - struct device *mux_dev; - void *mux_priv; + struct i2c_mux_core *muxc; u32 chan_id; - - int (*select)(struct i2c_adapter *, void *mux_priv, u32 chan_id); - int (*deselect)(struct i2c_adapter *, void *mux_priv, u32 chan_id); }; +static int __i2c_mux_master_xfer(struct i2c_adapter *adap, + struct i2c_msg msgs[], int num) +{ + struct i2c_mux_priv *priv = adap->algo_data; + struct i2c_mux_core *muxc = priv->muxc; + struct i2c_adapter *parent = muxc->parent; + int ret; + + /* Switch to the right mux port and perform the transfer. */ + + ret = muxc->select(muxc, priv->chan_id); + if (ret >= 0) + ret = __i2c_transfer(parent, msgs, num); + if (muxc->deselect) + muxc->deselect(muxc, priv->chan_id); + + return ret; +} + static int i2c_mux_master_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { struct i2c_mux_priv *priv = adap->algo_data; - struct i2c_adapter *parent = priv->parent; + struct i2c_mux_core *muxc = priv->muxc; + struct i2c_adapter *parent = muxc->parent; int ret; /* Switch to the right mux port and perform the transfer. */ - ret = priv->select(parent, priv->mux_priv, priv->chan_id); + ret = muxc->select(muxc, priv->chan_id); if (ret >= 0) - ret = __i2c_transfer(parent, msgs, num); - if (priv->deselect) - priv->deselect(parent, priv->mux_priv, priv->chan_id); + ret = i2c_transfer(parent, msgs, num); + if (muxc->deselect) + muxc->deselect(muxc, priv->chan_id); + + return ret; +} + +static int __i2c_mux_smbus_xfer(struct i2c_adapter *adap, + u16 addr, unsigned short flags, + char read_write, u8 command, + int size, union i2c_smbus_data *data) +{ + struct i2c_mux_priv *priv = adap->algo_data; + struct i2c_mux_core *muxc = priv->muxc; + struct i2c_adapter *parent = muxc->parent; + int ret; + + /* Select the right mux port and perform the transfer. */ + + ret = muxc->select(muxc, priv->chan_id); + if (ret >= 0) + ret = parent->algo->smbus_xfer(parent, addr, flags, + read_write, command, size, data); + if (muxc->deselect) + muxc->deselect(muxc, priv->chan_id); return ret; } @@ -65,17 +101,18 @@ static int i2c_mux_smbus_xfer(struct i2c_adapter *adap, int size, union i2c_smbus_data *data) { struct i2c_mux_priv *priv = adap->algo_data; - struct i2c_adapter *parent = priv->parent; + struct i2c_mux_core *muxc = priv->muxc; + struct i2c_adapter *parent = muxc->parent; int ret; /* Select the right mux port and perform the transfer. */ - ret = priv->select(parent, priv->mux_priv, priv->chan_id); + ret = muxc->select(muxc, priv->chan_id); if (ret >= 0) - ret = parent->algo->smbus_xfer(parent, addr, flags, - read_write, command, size, data); - if (priv->deselect) - priv->deselect(parent, priv->mux_priv, priv->chan_id); + ret = i2c_smbus_xfer(parent, addr, flags, + read_write, command, size, data); + if (muxc->deselect) + muxc->deselect(muxc, priv->chan_id); return ret; } @@ -84,7 +121,7 @@ static int i2c_mux_smbus_xfer(struct i2c_adapter *adap, static u32 i2c_mux_functionality(struct i2c_adapter *adap) { struct i2c_mux_priv *priv = adap->algo_data; - struct i2c_adapter *parent = priv->parent; + struct i2c_adapter *parent = priv->muxc->parent; return parent->algo->functionality(parent); } @@ -102,38 +139,167 @@ static unsigned int i2c_mux_parent_classes(struct i2c_adapter *parent) return class; } -struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, - struct device *mux_dev, - void *mux_priv, u32 force_nr, u32 chan_id, - unsigned int class, - int (*select) (struct i2c_adapter *, - void *, u32), - int (*deselect) (struct i2c_adapter *, - void *, u32)) +static void i2c_mux_lock_bus(struct i2c_adapter *adapter, unsigned int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + rt_mutex_lock(&parent->mux_lock); + if (!(flags & I2C_LOCK_ROOT_ADAPTER)) + return; + i2c_lock_bus(parent, flags); +} + +static int i2c_mux_trylock_bus(struct i2c_adapter *adapter, unsigned int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + if (!rt_mutex_trylock(&parent->mux_lock)) + return 0; /* mux_lock not locked, failure */ + if (!(flags & I2C_LOCK_ROOT_ADAPTER)) + return 1; /* we only want mux_lock, success */ + if (parent->trylock_bus(parent, flags)) + return 1; /* parent locked too, success */ + rt_mutex_unlock(&parent->mux_lock); + return 0; /* parent not locked, failure */ +} + +static void i2c_mux_unlock_bus(struct i2c_adapter *adapter, unsigned int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + if (flags & I2C_LOCK_ROOT_ADAPTER) + i2c_unlock_bus(parent, flags); + rt_mutex_unlock(&parent->mux_lock); +} + +static void i2c_parent_lock_bus(struct i2c_adapter *adapter, + unsigned int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + rt_mutex_lock(&parent->mux_lock); + i2c_lock_bus(parent, flags); +} + +static int i2c_parent_trylock_bus(struct i2c_adapter *adapter, + unsigned int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + if (!rt_mutex_trylock(&parent->mux_lock)) + return 0; /* mux_lock not locked, failure */ + if (parent->trylock_bus(parent, flags)) + return 1; /* parent locked too, success */ + rt_mutex_unlock(&parent->mux_lock); + return 0; /* parent not locked, failure */ +} + +static void i2c_parent_unlock_bus(struct i2c_adapter *adapter, + unsigned int flags) +{ + struct i2c_mux_priv *priv = adapter->algo_data; + struct i2c_adapter *parent = priv->muxc->parent; + + i2c_unlock_bus(parent, flags); + rt_mutex_unlock(&parent->mux_lock); +} + +struct i2c_adapter *i2c_root_adapter(struct device *dev) +{ + struct device *i2c; + struct i2c_adapter *i2c_root; + + /* + * Walk up the device tree to find an i2c adapter, indicating + * that this is an i2c client device. Check all ancestors to + * handle mfd devices etc. + */ + for (i2c = dev; i2c; i2c = i2c->parent) { + if (i2c->type == &i2c_adapter_type) + break; + } + if (!i2c) + return NULL; + + /* Continue up the tree to find the root i2c adapter */ + i2c_root = to_i2c_adapter(i2c); + while (i2c_parent_is_i2c_adapter(i2c_root)) + i2c_root = i2c_parent_is_i2c_adapter(i2c_root); + + return i2c_root; +} +EXPORT_SYMBOL_GPL(i2c_root_adapter); + +struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, + struct device *dev, int max_adapters, + int sizeof_priv, u32 flags, + int (*select)(struct i2c_mux_core *, u32), + int (*deselect)(struct i2c_mux_core *, u32)) +{ + struct i2c_mux_core *muxc; + + muxc = devm_kzalloc(dev, sizeof(*muxc) + + max_adapters * sizeof(muxc->adapter[0]) + + sizeof_priv, GFP_KERNEL); + if (!muxc) + return NULL; + if (sizeof_priv) + muxc->priv = &muxc->adapter[max_adapters]; + + muxc->parent = parent; + muxc->dev = dev; + if (flags & I2C_MUX_LOCKED) + muxc->mux_locked = true; + muxc->select = select; + muxc->deselect = deselect; + muxc->max_adapters = max_adapters; + + return muxc; +} +EXPORT_SYMBOL_GPL(i2c_mux_alloc); + +int i2c_mux_add_adapter(struct i2c_mux_core *muxc, + u32 force_nr, u32 chan_id, + unsigned int class) { + struct i2c_adapter *parent = muxc->parent; struct i2c_mux_priv *priv; char symlink_name[20]; int ret; - priv = kzalloc(sizeof(struct i2c_mux_priv), GFP_KERNEL); + if (muxc->num_adapters >= muxc->max_adapters) { + dev_err(muxc->dev, "No room for more i2c-mux adapters\n"); + return -EINVAL; + } + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) - return NULL; + return -ENOMEM; /* Set up private adapter data */ - priv->parent = parent; - priv->mux_dev = mux_dev; - priv->mux_priv = mux_priv; + priv->muxc = muxc; priv->chan_id = chan_id; - priv->select = select; - priv->deselect = deselect; /* Need to do algo dynamically because we don't know ahead * of time what sort of physical adapter we'll be dealing with. */ - if (parent->algo->master_xfer) - priv->algo.master_xfer = i2c_mux_master_xfer; - if (parent->algo->smbus_xfer) - priv->algo.smbus_xfer = i2c_mux_smbus_xfer; + if (parent->algo->master_xfer) { + if (muxc->mux_locked) + priv->algo.master_xfer = i2c_mux_master_xfer; + else + priv->algo.master_xfer = __i2c_mux_master_xfer; + } + if (parent->algo->smbus_xfer) { + if (muxc->mux_locked) + priv->algo.smbus_xfer = i2c_mux_smbus_xfer; + else + priv->algo.smbus_xfer = __i2c_mux_smbus_xfer; + } priv->algo.functionality = i2c_mux_functionality; /* Now fill out new adapter structure */ @@ -146,6 +312,15 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, priv->adap.retries = parent->retries; priv->adap.timeout = parent->timeout; priv->adap.quirks = parent->quirks; + if (muxc->mux_locked) { + priv->adap.lock_bus = i2c_mux_lock_bus; + priv->adap.trylock_bus = i2c_mux_trylock_bus; + priv->adap.unlock_bus = i2c_mux_unlock_bus; + } else { + priv->adap.lock_bus = i2c_parent_lock_bus; + priv->adap.trylock_bus = i2c_parent_trylock_bus; + priv->adap.unlock_bus = i2c_parent_unlock_bus; + } /* Sanity check on class */ if (i2c_mux_parent_classes(parent) & class) @@ -159,11 +334,11 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, * Try to populate the mux adapter's of_node, expands to * nothing if !CONFIG_OF. */ - if (mux_dev->of_node) { + if (muxc->dev->of_node) { struct device_node *child; u32 reg; - for_each_child_of_node(mux_dev->of_node, child) { + for_each_child_of_node(muxc->dev->of_node, child) { ret = of_property_read_u32(child, "reg", ®); if (ret) continue; @@ -177,8 +352,9 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, /* * Associate the mux channel with an ACPI node. */ - if (has_acpi_companion(mux_dev)) - acpi_preset_companion(&priv->adap.dev, ACPI_COMPANION(mux_dev), + if (has_acpi_companion(muxc->dev)) + acpi_preset_companion(&priv->adap.dev, + ACPI_COMPANION(muxc->dev), chan_id); if (force_nr) { @@ -192,35 +368,45 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, "failed to add mux-adapter (error=%d)\n", ret); kfree(priv); - return NULL; + return ret; } - WARN(sysfs_create_link(&priv->adap.dev.kobj, &mux_dev->kobj, "mux_device"), - "can't create symlink to mux device\n"); + WARN(sysfs_create_link(&priv->adap.dev.kobj, &muxc->dev->kobj, + "mux_device"), + "can't create symlink to mux device\n"); snprintf(symlink_name, sizeof(symlink_name), "channel-%u", chan_id); - WARN(sysfs_create_link(&mux_dev->kobj, &priv->adap.dev.kobj, symlink_name), - "can't create symlink for channel %u\n", chan_id); + WARN(sysfs_create_link(&muxc->dev->kobj, &priv->adap.dev.kobj, + symlink_name), + "can't create symlink for channel %u\n", chan_id); dev_info(&parent->dev, "Added multiplexed i2c bus %d\n", i2c_adapter_id(&priv->adap)); - return &priv->adap; + muxc->adapter[muxc->num_adapters++] = &priv->adap; + return 0; } -EXPORT_SYMBOL_GPL(i2c_add_mux_adapter); +EXPORT_SYMBOL_GPL(i2c_mux_add_adapter); -void i2c_del_mux_adapter(struct i2c_adapter *adap) +void i2c_mux_del_adapters(struct i2c_mux_core *muxc) { - struct i2c_mux_priv *priv = adap->algo_data; char symlink_name[20]; - snprintf(symlink_name, sizeof(symlink_name), "channel-%u", priv->chan_id); - sysfs_remove_link(&priv->mux_dev->kobj, symlink_name); + while (muxc->num_adapters) { + struct i2c_adapter *adap = muxc->adapter[--muxc->num_adapters]; + struct i2c_mux_priv *priv = adap->algo_data; + + muxc->adapter[muxc->num_adapters] = NULL; + + snprintf(symlink_name, sizeof(symlink_name), + "channel-%u", priv->chan_id); + sysfs_remove_link(&muxc->dev->kobj, symlink_name); - sysfs_remove_link(&priv->adap.dev.kobj, "mux_device"); - i2c_del_adapter(adap); - kfree(priv); + sysfs_remove_link(&priv->adap.dev.kobj, "mux_device"); + i2c_del_adapter(adap); + kfree(priv); + } } -EXPORT_SYMBOL_GPL(i2c_del_mux_adapter); +EXPORT_SYMBOL_GPL(i2c_mux_del_adapters); MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); MODULE_DESCRIPTION("I2C driver for multiplexed I2C busses"); diff --git a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c index 402e3a6c671a..a90bbc4037dd 100644 --- a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c +++ b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c @@ -28,8 +28,6 @@ /** * struct i2c_arbitrator_data - Driver data for I2C arbitrator * - * @parent: Parent adapter - * @child: Child bus * @our_gpio: GPIO we'll use to claim. * @our_gpio_release: 0 if active high; 1 if active low; AKA if the GPIO == * this then consider it released. @@ -42,8 +40,6 @@ */ struct i2c_arbitrator_data { - struct i2c_adapter *parent; - struct i2c_adapter *child; int our_gpio; int our_gpio_release; int their_gpio; @@ -59,9 +55,9 @@ struct i2c_arbitrator_data { * * Use the GPIO-based signalling protocol; return -EBUSY if we fail. */ -static int i2c_arbitrator_select(struct i2c_adapter *adap, void *data, u32 chan) +static int i2c_arbitrator_select(struct i2c_mux_core *muxc, u32 chan) { - const struct i2c_arbitrator_data *arb = data; + const struct i2c_arbitrator_data *arb = i2c_mux_priv(muxc); unsigned long stop_retry, stop_time; /* Start a round of trying to claim the bus */ @@ -93,7 +89,7 @@ static int i2c_arbitrator_select(struct i2c_adapter *adap, void *data, u32 chan) /* Give up, release our claim */ gpio_set_value(arb->our_gpio, arb->our_gpio_release); udelay(arb->slew_delay_us); - dev_err(&adap->dev, "Could not claim bus, timeout\n"); + dev_err(muxc->dev, "Could not claim bus, timeout\n"); return -EBUSY; } @@ -102,10 +98,9 @@ static int i2c_arbitrator_select(struct i2c_adapter *adap, void *data, u32 chan) * * Release the I2C bus using the GPIO-based signalling protocol. */ -static int i2c_arbitrator_deselect(struct i2c_adapter *adap, void *data, - u32 chan) +static int i2c_arbitrator_deselect(struct i2c_mux_core *muxc, u32 chan) { - const struct i2c_arbitrator_data *arb = data; + const struct i2c_arbitrator_data *arb = i2c_mux_priv(muxc); /* Release the bus and wait for the other master to notice */ gpio_set_value(arb->our_gpio, arb->our_gpio_release); @@ -119,6 +114,7 @@ static int i2c_arbitrator_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct device_node *parent_np; + struct i2c_mux_core *muxc; struct i2c_arbitrator_data *arb; enum of_gpio_flags gpio_flags; unsigned long out_init; @@ -134,12 +130,13 @@ static int i2c_arbitrator_probe(struct platform_device *pdev) return -EINVAL; } - arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL); - if (!arb) { - dev_err(dev, "Cannot allocate i2c_arbitrator_data\n"); + muxc = i2c_mux_alloc(NULL, dev, 1, sizeof(*arb), 0, + i2c_arbitrator_select, i2c_arbitrator_deselect); + if (!muxc) return -ENOMEM; - } - platform_set_drvdata(pdev, arb); + arb = i2c_mux_priv(muxc); + + platform_set_drvdata(pdev, muxc); /* Request GPIOs */ ret = of_get_named_gpio_flags(np, "our-claim-gpio", 0, &gpio_flags); @@ -196,21 +193,18 @@ static int i2c_arbitrator_probe(struct platform_device *pdev) dev_err(dev, "Cannot parse i2c-parent\n"); return -EINVAL; } - arb->parent = of_get_i2c_adapter_by_node(parent_np); + muxc->parent = of_get_i2c_adapter_by_node(parent_np); of_node_put(parent_np); - if (!arb->parent) { + if (!muxc->parent) { dev_err(dev, "Cannot find parent bus\n"); return -EPROBE_DEFER; } /* Actually add the mux adapter */ - arb->child = i2c_add_mux_adapter(arb->parent, dev, arb, 0, 0, 0, - i2c_arbitrator_select, - i2c_arbitrator_deselect); - if (!arb->child) { + ret = i2c_mux_add_adapter(muxc, 0, 0, 0); + if (ret) { dev_err(dev, "Failed to add adapter\n"); - ret = -ENODEV; - i2c_put_adapter(arb->parent); + i2c_put_adapter(muxc->parent); } return ret; @@ -218,11 +212,10 @@ static int i2c_arbitrator_probe(struct platform_device *pdev) static int i2c_arbitrator_remove(struct platform_device *pdev) { - struct i2c_arbitrator_data *arb = platform_get_drvdata(pdev); - - i2c_del_mux_adapter(arb->child); - i2c_put_adapter(arb->parent); + struct i2c_mux_core *muxc = platform_get_drvdata(pdev); + i2c_mux_del_adapters(muxc); + i2c_put_adapter(muxc->parent); return 0; } diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c index b8e11c16d98c..e5cf26eefa97 100644 --- a/drivers/i2c/muxes/i2c-mux-gpio.c +++ b/drivers/i2c/muxes/i2c-mux-gpio.c @@ -15,11 +15,10 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/gpio.h> +#include "../../gpio/gpiolib.h" #include <linux/of_gpio.h> struct gpiomux { - struct i2c_adapter *parent; - struct i2c_adapter **adap; /* child busses */ struct i2c_mux_gpio_platform_data data; unsigned gpio_base; }; @@ -33,18 +32,18 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val) val & (1 << i)); } -static int i2c_mux_gpio_select(struct i2c_adapter *adap, void *data, u32 chan) +static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan) { - struct gpiomux *mux = data; + struct gpiomux *mux = i2c_mux_priv(muxc); i2c_mux_gpio_set(mux, chan); return 0; } -static int i2c_mux_gpio_deselect(struct i2c_adapter *adap, void *data, u32 chan) +static int i2c_mux_gpio_deselect(struct i2c_mux_core *muxc, u32 chan) { - struct gpiomux *mux = data; + struct gpiomux *mux = i2c_mux_priv(muxc); i2c_mux_gpio_set(mux, mux->data.idle); @@ -136,19 +135,16 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux, static int i2c_mux_gpio_probe(struct platform_device *pdev) { + struct i2c_mux_core *muxc; struct gpiomux *mux; struct i2c_adapter *parent; - int (*deselect) (struct i2c_adapter *, void *, u32); + struct i2c_adapter *root; unsigned initial_state, gpio_base; int i, ret; mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL); - if (!mux) { - dev_err(&pdev->dev, "Cannot allocate gpiomux structure"); + if (!mux) return -ENOMEM; - } - - platform_set_drvdata(pdev, mux); if (!dev_get_platdata(&pdev->dev)) { ret = i2c_mux_gpio_probe_dt(mux, pdev); @@ -180,27 +176,32 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev) if (!parent) return -EPROBE_DEFER; - mux->parent = parent; - mux->gpio_base = gpio_base; - - mux->adap = devm_kzalloc(&pdev->dev, - sizeof(*mux->adap) * mux->data.n_values, - GFP_KERNEL); - if (!mux->adap) { - dev_err(&pdev->dev, "Cannot allocate i2c_adapter structure"); + muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values, 0, 0, + i2c_mux_gpio_select, NULL); + if (!muxc) { ret = -ENOMEM; goto alloc_failed; } + muxc->priv = mux; + + platform_set_drvdata(pdev, muxc); + + root = i2c_root_adapter(&parent->dev); + + muxc->mux_locked = true; + mux->gpio_base = gpio_base; if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) { initial_state = mux->data.idle; - deselect = i2c_mux_gpio_deselect; + muxc->deselect = i2c_mux_gpio_deselect; } else { initial_state = mux->data.values[0]; - deselect = NULL; } for (i = 0; i < mux->data.n_gpios; i++) { + struct device *gpio_dev; + struct gpio_desc *gpio_desc; + ret = gpio_request(gpio_base + mux->data.gpios[i], "i2c-mux-gpio"); if (ret) { dev_err(&pdev->dev, "Failed to request GPIO %d\n", @@ -217,17 +218,24 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev) i++; /* gpio_request above succeeded, so must free */ goto err_request_gpio; } + + if (!muxc->mux_locked) + continue; + + gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]); + gpio_dev = &gpio_desc->gdev->dev; + muxc->mux_locked = i2c_root_adapter(gpio_dev) == root; } + if (muxc->mux_locked) + dev_info(&pdev->dev, "mux-locked i2c mux\n"); + for (i = 0; i < mux->data.n_values; i++) { u32 nr = mux->data.base_nr ? (mux->data.base_nr + i) : 0; unsigned int class = mux->data.classes ? mux->data.classes[i] : 0; - mux->adap[i] = i2c_add_mux_adapter(parent, &pdev->dev, mux, nr, - mux->data.values[i], class, - i2c_mux_gpio_select, deselect); - if (!mux->adap[i]) { - ret = -ENODEV; + ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class); + if (ret) { dev_err(&pdev->dev, "Failed to add adapter %d\n", i); goto add_adapter_failed; } @@ -239,8 +247,7 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev) return 0; add_adapter_failed: - for (; i > 0; i--) - i2c_del_mux_adapter(mux->adap[i - 1]); + i2c_mux_del_adapters(muxc); i = mux->data.n_gpios; err_request_gpio: for (; i > 0; i--) @@ -253,16 +260,16 @@ alloc_failed: static int i2c_mux_gpio_remove(struct platform_device *pdev) { - struct gpiomux *mux = platform_get_drvdata(pdev); + struct i2c_mux_core *muxc = platform_get_drvdata(pdev); + struct gpiomux *mux = i2c_mux_priv(muxc); int i; - for (i = 0; i < mux->data.n_values; i++) - i2c_del_mux_adapter(mux->adap[i]); + i2c_mux_del_adapters(muxc); for (i = 0; i < mux->data.n_gpios; i++) gpio_free(mux->gpio_base + mux->data.gpios[i]); - i2c_put_adapter(mux->parent); + i2c_put_adapter(muxc->parent); return 0; } diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c index d0ba424adebc..3cb8af635db5 100644 --- a/drivers/i2c/muxes/i2c-mux-pca9541.c +++ b/drivers/i2c/muxes/i2c-mux-pca9541.c @@ -73,7 +73,7 @@ #define SELECT_DELAY_LONG 1000 struct pca9541 { - struct i2c_adapter *mux_adap; + struct i2c_client *client; unsigned long select_timeout; unsigned long arb_timeout; }; @@ -217,7 +217,8 @@ static const u8 pca9541_control[16] = { */ static int pca9541_arbitrate(struct i2c_client *client) { - struct pca9541 *data = i2c_get_clientdata(client); + struct i2c_mux_core *muxc = i2c_get_clientdata(client); + struct pca9541 *data = i2c_mux_priv(muxc); int reg; reg = pca9541_reg_read(client, PCA9541_CONTROL); @@ -285,9 +286,10 @@ static int pca9541_arbitrate(struct i2c_client *client) return 0; } -static int pca9541_select_chan(struct i2c_adapter *adap, void *client, u32 chan) +static int pca9541_select_chan(struct i2c_mux_core *muxc, u32 chan) { - struct pca9541 *data = i2c_get_clientdata(client); + struct pca9541 *data = i2c_mux_priv(muxc); + struct i2c_client *client = data->client; int ret; unsigned long timeout = jiffies + ARB2_TIMEOUT; /* give up after this time */ @@ -309,9 +311,11 @@ static int pca9541_select_chan(struct i2c_adapter *adap, void *client, u32 chan) return -ETIMEDOUT; } -static int pca9541_release_chan(struct i2c_adapter *adap, - void *client, u32 chan) +static int pca9541_release_chan(struct i2c_mux_core *muxc, u32 chan) { + struct pca9541 *data = i2c_mux_priv(muxc); + struct i2c_client *client = data->client; + pca9541_release_bus(client); return 0; } @@ -324,20 +328,13 @@ static int pca9541_probe(struct i2c_client *client, { struct i2c_adapter *adap = client->adapter; struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev); + struct i2c_mux_core *muxc; struct pca9541 *data; int force; - int ret = -ENODEV; + int ret; if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE_DATA)) - goto err; - - data = kzalloc(sizeof(struct pca9541), GFP_KERNEL); - if (!data) { - ret = -ENOMEM; - goto err; - } - - i2c_set_clientdata(client, data); + return -ENODEV; /* * I2C accesses are unprotected here. @@ -352,34 +349,33 @@ static int pca9541_probe(struct i2c_client *client, force = 0; if (pdata) force = pdata->modes[0].adap_id; - data->mux_adap = i2c_add_mux_adapter(adap, &client->dev, client, - force, 0, 0, - pca9541_select_chan, - pca9541_release_chan); + muxc = i2c_mux_alloc(adap, &client->dev, 1, sizeof(*data), 0, + pca9541_select_chan, pca9541_release_chan); + if (!muxc) + return -ENOMEM; - if (data->mux_adap == NULL) { + data = i2c_mux_priv(muxc); + data->client = client; + + i2c_set_clientdata(client, muxc); + + ret = i2c_mux_add_adapter(muxc, force, 0, 0); + if (ret) { dev_err(&client->dev, "failed to register master selector\n"); - goto exit_free; + return ret; } dev_info(&client->dev, "registered master selector for I2C %s\n", client->name); return 0; - -exit_free: - kfree(data); -err: - return ret; } static int pca9541_remove(struct i2c_client *client) { - struct pca9541 *data = i2c_get_clientdata(client); - - i2c_del_mux_adapter(data->mux_adap); + struct i2c_mux_core *muxc = i2c_get_clientdata(client); - kfree(data); + i2c_mux_del_adapters(muxc); return 0; } diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index acfcef3d4068..528e755c468f 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -60,9 +60,10 @@ enum pca_type { struct pca954x { enum pca_type type; - struct i2c_adapter *virt_adaps[PCA954X_MAX_NCHANS]; u8 last_chan; /* last register value */ + u8 deselect; + struct i2c_client *client; }; struct chip_desc { @@ -146,10 +147,10 @@ static int pca954x_reg_write(struct i2c_adapter *adap, return ret; } -static int pca954x_select_chan(struct i2c_adapter *adap, - void *client, u32 chan) +static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan) { - struct pca954x *data = i2c_get_clientdata(client); + struct pca954x *data = i2c_mux_priv(muxc); + struct i2c_client *client = data->client; const struct chip_desc *chip = &chips[data->type]; u8 regval; int ret = 0; @@ -162,21 +163,24 @@ static int pca954x_select_chan(struct i2c_adapter *adap, /* Only select the channel if its different from the last channel */ if (data->last_chan != regval) { - ret = pca954x_reg_write(adap, client, regval); + ret = pca954x_reg_write(muxc->parent, client, regval); data->last_chan = regval; } return ret; } -static int pca954x_deselect_mux(struct i2c_adapter *adap, - void *client, u32 chan) +static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan) { - struct pca954x *data = i2c_get_clientdata(client); + struct pca954x *data = i2c_mux_priv(muxc); + struct i2c_client *client = data->client; + + if (!(data->deselect & (1 << chan))) + return 0; /* Deselect active channel */ data->last_chan = 0; - return pca954x_reg_write(adap, client, data->last_chan); + return pca954x_reg_write(muxc->parent, client, data->last_chan); } /* @@ -191,17 +195,22 @@ static int pca954x_probe(struct i2c_client *client, bool idle_disconnect_dt; struct gpio_desc *gpio; int num, force, class; + struct i2c_mux_core *muxc; struct pca954x *data; int ret; if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE)) return -ENODEV; - data = devm_kzalloc(&client->dev, sizeof(struct pca954x), GFP_KERNEL); - if (!data) + muxc = i2c_mux_alloc(adap, &client->dev, + PCA954X_MAX_NCHANS, sizeof(*data), 0, + pca954x_select_chan, pca954x_deselect_mux); + if (!muxc) return -ENOMEM; + data = i2c_mux_priv(muxc); - i2c_set_clientdata(client, data); + i2c_set_clientdata(client, muxc); + data->client = client; /* Get the mux out of reset if a reset GPIO is specified. */ gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW); @@ -238,16 +247,13 @@ static int pca954x_probe(struct i2c_client *client, /* discard unconfigured channels */ break; idle_disconnect_pd = pdata->modes[num].deselect_on_exit; + data->deselect |= (idle_disconnect_pd + || idle_disconnect_dt) << num; } - data->virt_adaps[num] = - i2c_add_mux_adapter(adap, &client->dev, client, - force, num, class, pca954x_select_chan, - (idle_disconnect_pd || idle_disconnect_dt) - ? pca954x_deselect_mux : NULL); + ret = i2c_mux_add_adapter(muxc, force, num, class); - if (data->virt_adaps[num] == NULL) { - ret = -ENODEV; + if (ret) { dev_err(&client->dev, "failed to register multiplexed adapter" " %d as bus %d\n", num, force); @@ -263,23 +269,15 @@ static int pca954x_probe(struct i2c_client *client, return 0; virt_reg_failed: - for (num--; num >= 0; num--) - i2c_del_mux_adapter(data->virt_adaps[num]); + i2c_mux_del_adapters(muxc); return ret; } static int pca954x_remove(struct i2c_client *client) { - struct pca954x *data = i2c_get_clientdata(client); - const struct chip_desc *chip = &chips[data->type]; - int i; - - for (i = 0; i < chip->nchans; ++i) - if (data->virt_adaps[i]) { - i2c_del_mux_adapter(data->virt_adaps[i]); - data->virt_adaps[i] = NULL; - } + struct i2c_mux_core *muxc = i2c_get_clientdata(client); + i2c_mux_del_adapters(muxc); return 0; } @@ -287,7 +285,8 @@ static int pca954x_remove(struct i2c_client *client) static int pca954x_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); - struct pca954x *data = i2c_get_clientdata(client); + struct i2c_mux_core *muxc = i2c_get_clientdata(client); + struct pca954x *data = i2c_mux_priv(muxc); data->last_chan = 0; return i2c_smbus_write_byte(client, 0); diff --git a/drivers/i2c/muxes/i2c-mux-pinctrl.c b/drivers/i2c/muxes/i2c-mux-pinctrl.c index b5a982ba8898..35bb775e1b74 100644 --- a/drivers/i2c/muxes/i2c-mux-pinctrl.c +++ b/drivers/i2c/muxes/i2c-mux-pinctrl.c @@ -24,36 +24,32 @@ #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/of.h> +#include "../../pinctrl/core.h" struct i2c_mux_pinctrl { - struct device *dev; struct i2c_mux_pinctrl_platform_data *pdata; struct pinctrl *pinctrl; struct pinctrl_state **states; struct pinctrl_state *state_idle; - struct i2c_adapter *parent; - struct i2c_adapter **busses; }; -static int i2c_mux_pinctrl_select(struct i2c_adapter *adap, void *data, - u32 chan) +static int i2c_mux_pinctrl_select(struct i2c_mux_core *muxc, u32 chan) { - struct i2c_mux_pinctrl *mux = data; + struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc); return pinctrl_select_state(mux->pinctrl, mux->states[chan]); } -static int i2c_mux_pinctrl_deselect(struct i2c_adapter *adap, void *data, - u32 chan) +static int i2c_mux_pinctrl_deselect(struct i2c_mux_core *muxc, u32 chan) { - struct i2c_mux_pinctrl *mux = data; + struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc); return pinctrl_select_state(mux->pinctrl, mux->state_idle); } #ifdef CONFIG_OF static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux, - struct platform_device *pdev) + struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; int num_names, i, ret; @@ -64,15 +60,12 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux, return 0; mux->pdata = devm_kzalloc(&pdev->dev, sizeof(*mux->pdata), GFP_KERNEL); - if (!mux->pdata) { - dev_err(mux->dev, - "Cannot allocate i2c_mux_pinctrl_platform_data\n"); + if (!mux->pdata) return -ENOMEM; - } num_names = of_property_count_strings(np, "pinctrl-names"); if (num_names < 0) { - dev_err(mux->dev, "Cannot parse pinctrl-names: %d\n", + dev_err(&pdev->dev, "Cannot parse pinctrl-names: %d\n", num_names); return num_names; } @@ -80,23 +73,22 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux, mux->pdata->pinctrl_states = devm_kzalloc(&pdev->dev, sizeof(*mux->pdata->pinctrl_states) * num_names, GFP_KERNEL); - if (!mux->pdata->pinctrl_states) { - dev_err(mux->dev, "Cannot allocate pinctrl_states\n"); + if (!mux->pdata->pinctrl_states) return -ENOMEM; - } for (i = 0; i < num_names; i++) { ret = of_property_read_string_index(np, "pinctrl-names", i, &mux->pdata->pinctrl_states[mux->pdata->bus_count]); if (ret < 0) { - dev_err(mux->dev, "Cannot parse pinctrl-names: %d\n", + dev_err(&pdev->dev, "Cannot parse pinctrl-names: %d\n", ret); return ret; } if (!strcmp(mux->pdata->pinctrl_states[mux->pdata->bus_count], "idle")) { if (i != num_names - 1) { - dev_err(mux->dev, "idle state must be last\n"); + dev_err(&pdev->dev, + "idle state must be last\n"); return -EINVAL; } mux->pdata->pinctrl_state_idle = "idle"; @@ -107,13 +99,13 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux, adapter_np = of_parse_phandle(np, "i2c-parent", 0); if (!adapter_np) { - dev_err(mux->dev, "Cannot parse i2c-parent\n"); + dev_err(&pdev->dev, "Cannot parse i2c-parent\n"); return -ENODEV; } adapter = of_find_i2c_adapter_by_node(adapter_np); of_node_put(adapter_np); if (!adapter) { - dev_err(mux->dev, "Cannot find parent bus\n"); + dev_err(&pdev->dev, "Cannot find parent bus\n"); return -EPROBE_DEFER; } mux->pdata->parent_bus_num = i2c_adapter_id(adapter); @@ -129,21 +121,38 @@ static inline int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux, } #endif +static struct i2c_adapter *i2c_mux_pinctrl_root_adapter( + struct pinctrl_state *state) +{ + struct i2c_adapter *root = NULL; + struct pinctrl_setting *setting; + struct i2c_adapter *pin_root; + + list_for_each_entry(setting, &state->settings, node) { + pin_root = i2c_root_adapter(setting->pctldev->dev); + if (!pin_root) + return NULL; + if (!root) + root = pin_root; + else if (root != pin_root) + return NULL; + } + + return root; +} + static int i2c_mux_pinctrl_probe(struct platform_device *pdev) { + struct i2c_mux_core *muxc; struct i2c_mux_pinctrl *mux; - int (*deselect)(struct i2c_adapter *, void *, u32); + struct i2c_adapter *root; int i, ret; mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL); if (!mux) { - dev_err(&pdev->dev, "Cannot allocate i2c_mux_pinctrl\n"); ret = -ENOMEM; goto err; } - platform_set_drvdata(pdev, mux); - - mux->dev = &pdev->dev; mux->pdata = dev_get_platdata(&pdev->dev); if (!mux->pdata) { @@ -166,14 +175,15 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev) goto err; } - mux->busses = devm_kzalloc(&pdev->dev, - sizeof(*mux->busses) * mux->pdata->bus_count, - GFP_KERNEL); - if (!mux->busses) { - dev_err(&pdev->dev, "Cannot allocate busses\n"); + muxc = i2c_mux_alloc(NULL, &pdev->dev, mux->pdata->bus_count, 0, 0, + i2c_mux_pinctrl_select, NULL); + if (!muxc) { ret = -ENOMEM; goto err; } + muxc->priv = mux; + + platform_set_drvdata(pdev, muxc); mux->pinctrl = devm_pinctrl_get(&pdev->dev); if (IS_ERR(mux->pinctrl)) { @@ -184,13 +194,13 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev) for (i = 0; i < mux->pdata->bus_count; i++) { mux->states[i] = pinctrl_lookup_state(mux->pinctrl, mux->pdata->pinctrl_states[i]); - if (IS_ERR(mux->states[i])) { - ret = PTR_ERR(mux->states[i]); - dev_err(&pdev->dev, - "Cannot look up pinctrl state %s: %d\n", - mux->pdata->pinctrl_states[i], ret); - goto err; - } + if (IS_ERR(mux->states[i])) { + ret = PTR_ERR(mux->states[i]); + dev_err(&pdev->dev, + "Cannot look up pinctrl state %s: %d\n", + mux->pdata->pinctrl_states[i], ret); + goto err; + } } if (mux->pdata->pinctrl_state_idle) { mux->state_idle = pinctrl_lookup_state(mux->pinctrl, @@ -203,29 +213,39 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev) goto err; } - deselect = i2c_mux_pinctrl_deselect; - } else { - deselect = NULL; + muxc->deselect = i2c_mux_pinctrl_deselect; } - mux->parent = i2c_get_adapter(mux->pdata->parent_bus_num); - if (!mux->parent) { + muxc->parent = i2c_get_adapter(mux->pdata->parent_bus_num); + if (!muxc->parent) { dev_err(&pdev->dev, "Parent adapter (%d) not found\n", mux->pdata->parent_bus_num); ret = -EPROBE_DEFER; goto err; } + root = i2c_root_adapter(&muxc->parent->dev); + + muxc->mux_locked = true; + for (i = 0; i < mux->pdata->bus_count; i++) { + if (root != i2c_mux_pinctrl_root_adapter(mux->states[i])) { + muxc->mux_locked = false; + break; + } + } + if (muxc->mux_locked && mux->pdata->pinctrl_state_idle && + root != i2c_mux_pinctrl_root_adapter(mux->state_idle)) + muxc->mux_locked = false; + + if (muxc->mux_locked) + dev_info(&pdev->dev, "mux-locked i2c mux\n"); + for (i = 0; i < mux->pdata->bus_count; i++) { u32 bus = mux->pdata->base_bus_num ? (mux->pdata->base_bus_num + i) : 0; - mux->busses[i] = i2c_add_mux_adapter(mux->parent, &pdev->dev, - mux, bus, i, 0, - i2c_mux_pinctrl_select, - deselect); - if (!mux->busses[i]) { - ret = -ENODEV; + ret = i2c_mux_add_adapter(muxc, bus, i, 0); + if (ret) { dev_err(&pdev->dev, "Failed to add adapter %d\n", i); goto err_del_adapter; } @@ -234,23 +254,18 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev) return 0; err_del_adapter: - for (; i > 0; i--) - i2c_del_mux_adapter(mux->busses[i - 1]); - i2c_put_adapter(mux->parent); + i2c_mux_del_adapters(muxc); + i2c_put_adapter(muxc->parent); err: return ret; } static int i2c_mux_pinctrl_remove(struct platform_device *pdev) { - struct i2c_mux_pinctrl *mux = platform_get_drvdata(pdev); - int i; - - for (i = 0; i < mux->pdata->bus_count; i++) - i2c_del_mux_adapter(mux->busses[i]); - - i2c_put_adapter(mux->parent); + struct i2c_mux_core *muxc = platform_get_drvdata(pdev); + i2c_mux_del_adapters(muxc); + i2c_put_adapter(muxc->parent); return 0; } diff --git a/drivers/i2c/muxes/i2c-mux-reg.c b/drivers/i2c/muxes/i2c-mux-reg.c index 5fbd5bd0878f..6773cadf7c9f 100644 --- a/drivers/i2c/muxes/i2c-mux-reg.c +++ b/drivers/i2c/muxes/i2c-mux-reg.c @@ -21,8 +21,6 @@ #include <linux/slab.h> struct regmux { - struct i2c_adapter *parent; - struct i2c_adapter **adap; /* child busses */ struct i2c_mux_reg_platform_data data; }; @@ -64,18 +62,16 @@ static int i2c_mux_reg_set(const struct regmux *mux, unsigned int chan_id) return 0; } -static int i2c_mux_reg_select(struct i2c_adapter *adap, void *data, - unsigned int chan) +static int i2c_mux_reg_select(struct i2c_mux_core *muxc, u32 chan) { - struct regmux *mux = data; + struct regmux *mux = i2c_mux_priv(muxc); return i2c_mux_reg_set(mux, chan); } -static int i2c_mux_reg_deselect(struct i2c_adapter *adap, void *data, - unsigned int chan) +static int i2c_mux_reg_deselect(struct i2c_mux_core *muxc, u32 chan) { - struct regmux *mux = data; + struct regmux *mux = i2c_mux_priv(muxc); if (mux->data.idle_in_use) return i2c_mux_reg_set(mux, mux->data.idle); @@ -85,7 +81,7 @@ static int i2c_mux_reg_deselect(struct i2c_adapter *adap, void *data, #ifdef CONFIG_OF static int i2c_mux_reg_probe_dt(struct regmux *mux, - struct platform_device *pdev) + struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct device_node *adapter_np, *child; @@ -107,7 +103,6 @@ static int i2c_mux_reg_probe_dt(struct regmux *mux, if (!adapter) return -EPROBE_DEFER; - mux->parent = adapter; mux->data.parent = i2c_adapter_id(adapter); put_device(&adapter->dev); @@ -161,7 +156,7 @@ static int i2c_mux_reg_probe_dt(struct regmux *mux, } #else static int i2c_mux_reg_probe_dt(struct regmux *mux, - struct platform_device *pdev) + struct platform_device *pdev) { return 0; } @@ -169,10 +164,10 @@ static int i2c_mux_reg_probe_dt(struct regmux *mux, static int i2c_mux_reg_probe(struct platform_device *pdev) { + struct i2c_mux_core *muxc; struct regmux *mux; struct i2c_adapter *parent; struct resource *res; - int (*deselect)(struct i2c_adapter *, void *, u32); unsigned int class; int i, ret, nr; @@ -180,17 +175,9 @@ static int i2c_mux_reg_probe(struct platform_device *pdev) if (!mux) return -ENOMEM; - platform_set_drvdata(pdev, mux); - if (dev_get_platdata(&pdev->dev)) { memcpy(&mux->data, dev_get_platdata(&pdev->dev), sizeof(mux->data)); - - parent = i2c_get_adapter(mux->data.parent); - if (!parent) - return -EPROBE_DEFER; - - mux->parent = parent; } else { ret = i2c_mux_reg_probe_dt(mux, pdev); if (ret < 0) { @@ -199,6 +186,10 @@ static int i2c_mux_reg_probe(struct platform_device *pdev) } } + parent = i2c_get_adapter(mux->data.parent); + if (!parent) + return -EPROBE_DEFER; + if (!mux->data.reg) { dev_info(&pdev->dev, "Register not set, using platform resource\n"); @@ -215,55 +206,45 @@ static int i2c_mux_reg_probe(struct platform_device *pdev) return -EINVAL; } - mux->adap = devm_kzalloc(&pdev->dev, - sizeof(*mux->adap) * mux->data.n_values, - GFP_KERNEL); - if (!mux->adap) { - dev_err(&pdev->dev, "Cannot allocate i2c_adapter structure"); + muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values, 0, 0, + i2c_mux_reg_select, NULL); + if (!muxc) return -ENOMEM; - } + muxc->priv = mux; + + platform_set_drvdata(pdev, muxc); if (mux->data.idle_in_use) - deselect = i2c_mux_reg_deselect; - else - deselect = NULL; + muxc->deselect = i2c_mux_reg_deselect; for (i = 0; i < mux->data.n_values; i++) { nr = mux->data.base_nr ? (mux->data.base_nr + i) : 0; class = mux->data.classes ? mux->data.classes[i] : 0; - mux->adap[i] = i2c_add_mux_adapter(mux->parent, &pdev->dev, mux, - nr, mux->data.values[i], - class, i2c_mux_reg_select, - deselect); - if (!mux->adap[i]) { - ret = -ENODEV; + ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class); + if (ret) { dev_err(&pdev->dev, "Failed to add adapter %d\n", i); goto add_adapter_failed; } } dev_dbg(&pdev->dev, "%d port mux on %s adapter\n", - mux->data.n_values, mux->parent->name); + mux->data.n_values, muxc->parent->name); return 0; add_adapter_failed: - for (; i > 0; i--) - i2c_del_mux_adapter(mux->adap[i - 1]); + i2c_mux_del_adapters(muxc); return ret; } static int i2c_mux_reg_remove(struct platform_device *pdev) { - struct regmux *mux = platform_get_drvdata(pdev); - int i; - - for (i = 0; i < mux->data.n_values; i++) - i2c_del_mux_adapter(mux->adap[i]); + struct i2c_mux_core *muxc = platform_get_drvdata(pdev); - i2c_put_adapter(mux->parent); + i2c_mux_del_adapters(muxc); + i2c_put_adapter(muxc->parent); return 0; } diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c index 2771106fd650..f62b8bd9ad7e 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c @@ -183,7 +183,7 @@ int inv_mpu_acpi_create_mux_client(struct i2c_client *client) } else return 0; /* no secondary addr, which is OK */ } - st->mux_client = i2c_new_device(st->mux_adapter, &info); + st->mux_client = i2c_new_device(st->muxc->adapter[0], &info); if (!st->mux_client) return -ENODEV; } diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index d192953e9a38..0c2bded2b5b7 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -23,7 +23,6 @@ #include <linux/kfifo.h> #include <linux/spinlock.h> #include <linux/iio/iio.h> -#include <linux/i2c-mux.h> #include <linux/acpi.h> #include "inv_mpu_iio.h" diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c index 5ee4e0dc093e..9ba1179105bd 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c @@ -15,7 +15,6 @@ #include <linux/delay.h> #include <linux/err.h> #include <linux/i2c.h> -#include <linux/i2c-mux.h> #include <linux/iio/iio.h> #include <linux/module.h> #include "inv_mpu_iio.h" @@ -25,46 +24,16 @@ static const struct regmap_config inv_mpu_regmap_config = { .val_bits = 8, }; -/* - * The i2c read/write needs to happen in unlocked mode. As the parent - * adapter is common. If we use locked versions, it will fail as - * the mux adapter will lock the parent i2c adapter, while calling - * select/deselect functions. - */ -static int inv_mpu6050_write_reg_unlocked(struct i2c_client *client, - u8 reg, u8 d) +static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id) { - int ret; - u8 buf[2] = {reg, d}; - struct i2c_msg msg[1] = { - { - .addr = client->addr, - .flags = 0, - .len = sizeof(buf), - .buf = buf, - } - }; - - ret = __i2c_transfer(client->adapter, msg, 1); - if (ret != 1) - return ret; - - return 0; -} - -static int inv_mpu6050_select_bypass(struct i2c_adapter *adap, void *mux_priv, - u32 chan_id) -{ - struct i2c_client *client = mux_priv; - struct iio_dev *indio_dev = dev_get_drvdata(&client->dev); + struct iio_dev *indio_dev = i2c_mux_priv(muxc); struct inv_mpu6050_state *st = iio_priv(indio_dev); int ret = 0; /* Use the same mutex which was used everywhere to protect power-op */ mutex_lock(&indio_dev->mlock); if (!st->powerup_count) { - ret = inv_mpu6050_write_reg_unlocked(client, - st->reg->pwr_mgmt_1, 0); + ret = regmap_write(st->map, st->reg->pwr_mgmt_1, 0); if (ret) goto write_error; @@ -73,10 +42,9 @@ static int inv_mpu6050_select_bypass(struct i2c_adapter *adap, void *mux_priv, } if (!ret) { st->powerup_count++; - ret = inv_mpu6050_write_reg_unlocked(client, - st->reg->int_pin_cfg, - INV_MPU6050_INT_PIN_CFG | - INV_MPU6050_BIT_BYPASS_EN); + ret = regmap_write(st->map, st->reg->int_pin_cfg, + INV_MPU6050_INT_PIN_CFG | + INV_MPU6050_BIT_BYPASS_EN); } write_error: mutex_unlock(&indio_dev->mlock); @@ -84,21 +52,18 @@ write_error: return ret; } -static int inv_mpu6050_deselect_bypass(struct i2c_adapter *adap, - void *mux_priv, u32 chan_id) +static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id) { - struct i2c_client *client = mux_priv; - struct iio_dev *indio_dev = dev_get_drvdata(&client->dev); + struct iio_dev *indio_dev = i2c_mux_priv(muxc); struct inv_mpu6050_state *st = iio_priv(indio_dev); mutex_lock(&indio_dev->mlock); /* It doesn't really mattter, if any of the calls fails */ - inv_mpu6050_write_reg_unlocked(client, st->reg->int_pin_cfg, - INV_MPU6050_INT_PIN_CFG); + regmap_write(st->map, st->reg->int_pin_cfg, INV_MPU6050_INT_PIN_CFG); st->powerup_count--; if (!st->powerup_count) - inv_mpu6050_write_reg_unlocked(client, st->reg->pwr_mgmt_1, - INV_MPU6050_BIT_SLEEP); + regmap_write(st->map, st->reg->pwr_mgmt_1, + INV_MPU6050_BIT_SLEEP); mutex_unlock(&indio_dev->mlock); return 0; @@ -160,16 +125,18 @@ static int inv_mpu_probe(struct i2c_client *client, return result; st = iio_priv(dev_get_drvdata(&client->dev)); - st->mux_adapter = i2c_add_mux_adapter(client->adapter, - &client->dev, - client, - 0, 0, 0, - inv_mpu6050_select_bypass, - inv_mpu6050_deselect_bypass); - if (!st->mux_adapter) { - result = -ENODEV; + st->muxc = i2c_mux_alloc(client->adapter, &client->dev, + 1, 0, I2C_MUX_LOCKED, + inv_mpu6050_select_bypass, + inv_mpu6050_deselect_bypass); + if (!st->muxc) { + result = -ENOMEM; goto out_unreg_device; } + st->muxc->priv = dev_get_drvdata(&client->dev); + result = i2c_mux_add_adapter(st->muxc, 0, 0, 0); + if (result) + goto out_unreg_device; result = inv_mpu_acpi_create_mux_client(client); if (result) @@ -178,7 +145,7 @@ static int inv_mpu_probe(struct i2c_client *client, return 0; out_del_mux: - i2c_del_mux_adapter(st->mux_adapter); + i2c_mux_del_adapters(st->muxc); out_unreg_device: inv_mpu_core_remove(&client->dev); return result; @@ -190,7 +157,7 @@ static int inv_mpu_remove(struct i2c_client *client) struct inv_mpu6050_state *st = iio_priv(indio_dev); inv_mpu_acpi_delete_mux_client(client); - i2c_del_mux_adapter(st->mux_adapter); + i2c_mux_del_adapters(st->muxc); return inv_mpu_core_remove(&client->dev); } diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h index e302a49703bf..bb3cef6d7059 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h @@ -11,6 +11,7 @@ * GNU General Public License for more details. */ #include <linux/i2c.h> +#include <linux/i2c-mux.h> #include <linux/kfifo.h> #include <linux/spinlock.h> #include <linux/iio/iio.h> @@ -127,7 +128,7 @@ struct inv_mpu6050_state { const struct inv_mpu6050_hw *hw; enum inv_devices chip_type; spinlock_t time_stamp_lock; - struct i2c_adapter *mux_adapter; + struct i2c_mux_core *muxc; struct i2c_client *mux_client; unsigned int powerup_count; struct inv_mpu6050_platform_data plat_data; diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 76883600ec6f..5557ef8fc704 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -1251,9 +1251,9 @@ static void m88ds3103_release(struct dvb_frontend *fe) i2c_unregister_device(client); } -static int m88ds3103_select(struct i2c_adapter *adap, void *mux_priv, u32 chan) +static int m88ds3103_select(struct i2c_mux_core *muxc, u32 chan) { - struct m88ds3103_dev *dev = mux_priv; + struct m88ds3103_dev *dev = i2c_mux_priv(muxc); struct i2c_client *client = dev->client; int ret; struct i2c_msg msg = { @@ -1374,7 +1374,7 @@ static struct i2c_adapter *m88ds3103_get_i2c_adapter(struct i2c_client *client) dev_dbg(&client->dev, "\n"); - return dev->i2c_adapter; + return dev->muxc->adapter[0]; } static int m88ds3103_probe(struct i2c_client *client, @@ -1467,13 +1467,16 @@ static int m88ds3103_probe(struct i2c_client *client, goto err_kfree; /* create mux i2c adapter for tuner */ - dev->i2c_adapter = i2c_add_mux_adapter(client->adapter, &client->dev, - dev, 0, 0, 0, m88ds3103_select, - NULL); - if (dev->i2c_adapter == NULL) { + dev->muxc = i2c_mux_alloc(client->adapter, &client->dev, 1, 0, 0, + m88ds3103_select, NULL); + if (!dev->muxc) { ret = -ENOMEM; goto err_kfree; } + dev->muxc->priv = dev; + ret = i2c_mux_add_adapter(dev->muxc, 0, 0, 0); + if (ret) + goto err_kfree; /* create dvb_frontend */ memcpy(&dev->fe.ops, &m88ds3103_ops, sizeof(struct dvb_frontend_ops)); @@ -1502,7 +1505,7 @@ static int m88ds3103_remove(struct i2c_client *client) dev_dbg(&client->dev, "\n"); - i2c_del_mux_adapter(dev->i2c_adapter); + i2c_mux_del_adapters(dev->muxc); kfree(dev); return 0; diff --git a/drivers/media/dvb-frontends/m88ds3103_priv.h b/drivers/media/dvb-frontends/m88ds3103_priv.h index 651e005146b2..d78e467295d2 100644 --- a/drivers/media/dvb-frontends/m88ds3103_priv.h +++ b/drivers/media/dvb-frontends/m88ds3103_priv.h @@ -42,7 +42,7 @@ struct m88ds3103_dev { enum fe_status fe_status; u32 dvbv3_ber; /* for old DVBv3 API read_ber */ bool warm; /* FW running */ - struct i2c_adapter *i2c_adapter; + struct i2c_mux_core *muxc; /* auto detect chip id to do different config */ u8 chip_id; /* main mclk is calculated for M88RS6000 dynamically */ diff --git a/drivers/media/dvb-frontends/rtl2830.c b/drivers/media/dvb-frontends/rtl2830.c index 3f96429af0e5..d25d1e0cd4ca 100644 --- a/drivers/media/dvb-frontends/rtl2830.c +++ b/drivers/media/dvb-frontends/rtl2830.c @@ -677,9 +677,9 @@ err: * adapter lock is already taken by tuner driver. * Gate is closed automatically after single I2C transfer. */ -static int rtl2830_select(struct i2c_adapter *adap, void *mux_priv, u32 chan_id) +static int rtl2830_select(struct i2c_mux_core *muxc, u32 chan_id) { - struct i2c_client *client = mux_priv; + struct i2c_client *client = i2c_mux_priv(muxc); struct rtl2830_dev *dev = i2c_get_clientdata(client); int ret; @@ -712,7 +712,7 @@ static struct i2c_adapter *rtl2830_get_i2c_adapter(struct i2c_client *client) dev_dbg(&client->dev, "\n"); - return dev->adapter; + return dev->muxc->adapter[0]; } /* @@ -865,12 +865,16 @@ static int rtl2830_probe(struct i2c_client *client, goto err_regmap_exit; /* create muxed i2c adapter for tuner */ - dev->adapter = i2c_add_mux_adapter(client->adapter, &client->dev, - client, 0, 0, 0, rtl2830_select, NULL); - if (dev->adapter == NULL) { - ret = -ENODEV; + dev->muxc = i2c_mux_alloc(client->adapter, &client->dev, 1, 0, 0, + rtl2830_select, NULL); + if (!dev->muxc) { + ret = -ENOMEM; goto err_regmap_exit; } + dev->muxc->priv = client; + ret = i2c_mux_add_adapter(dev->muxc, 0, 0, 0); + if (ret) + goto err_regmap_exit; /* create dvb frontend */ memcpy(&dev->fe.ops, &rtl2830_ops, sizeof(dev->fe.ops)); @@ -903,7 +907,7 @@ static int rtl2830_remove(struct i2c_client *client) /* stop statistics polling */ cancel_delayed_work_sync(&dev->stat_work); - i2c_del_mux_adapter(dev->adapter); + i2c_mux_del_adapters(dev->muxc); regmap_exit(dev->regmap); kfree(dev); diff --git a/drivers/media/dvb-frontends/rtl2830_priv.h b/drivers/media/dvb-frontends/rtl2830_priv.h index cf793f39a09b..da4909543da2 100644 --- a/drivers/media/dvb-frontends/rtl2830_priv.h +++ b/drivers/media/dvb-frontends/rtl2830_priv.h @@ -29,7 +29,7 @@ struct rtl2830_dev { struct rtl2830_platform_data *pdata; struct i2c_client *client; struct regmap *regmap; - struct i2c_adapter *adapter; + struct i2c_mux_core *muxc; struct dvb_frontend fe; bool sleeping; unsigned long filters; diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index 7c96f7679669..bfb6beedd40b 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -153,43 +153,6 @@ static const struct rtl2832_reg_entry registers[] = { [DVBT_REG_4MSEL] = {0x013, 0, 0}, }; -/* Our regmap is bypassing I2C adapter lock, thus we do it! */ -static int rtl2832_bulk_write(struct i2c_client *client, unsigned int reg, - const void *val, size_t val_count) -{ - struct rtl2832_dev *dev = i2c_get_clientdata(client); - int ret; - - i2c_lock_adapter(client->adapter); - ret = regmap_bulk_write(dev->regmap, reg, val, val_count); - i2c_unlock_adapter(client->adapter); - return ret; -} - -static int rtl2832_update_bits(struct i2c_client *client, unsigned int reg, - unsigned int mask, unsigned int val) -{ - struct rtl2832_dev *dev = i2c_get_clientdata(client); - int ret; - - i2c_lock_adapter(client->adapter); - ret = regmap_update_bits(dev->regmap, reg, mask, val); - i2c_unlock_adapter(client->adapter); - return ret; -} - -static int rtl2832_bulk_read(struct i2c_client *client, unsigned int reg, - void *val, size_t val_count) -{ - struct rtl2832_dev *dev = i2c_get_clientdata(client); - int ret; - - i2c_lock_adapter(client->adapter); - ret = regmap_bulk_read(dev->regmap, reg, val, val_count); - i2c_unlock_adapter(client->adapter); - return ret; -} - static int rtl2832_rd_demod_reg(struct rtl2832_dev *dev, int reg, u32 *val) { struct i2c_client *client = dev->client; @@ -204,7 +167,7 @@ static int rtl2832_rd_demod_reg(struct rtl2832_dev *dev, int reg, u32 *val) len = (msb >> 3) + 1; mask = REG_MASK(msb - lsb); - ret = rtl2832_bulk_read(client, reg_start_addr, reading, len); + ret = regmap_bulk_read(dev->regmap, reg_start_addr, reading, len); if (ret) goto err; @@ -234,7 +197,7 @@ static int rtl2832_wr_demod_reg(struct rtl2832_dev *dev, int reg, u32 val) len = (msb >> 3) + 1; mask = REG_MASK(msb - lsb); - ret = rtl2832_bulk_read(client, reg_start_addr, reading, len); + ret = regmap_bulk_read(dev->regmap, reg_start_addr, reading, len); if (ret) goto err; @@ -248,7 +211,7 @@ static int rtl2832_wr_demod_reg(struct rtl2832_dev *dev, int reg, u32 val) for (i = 0; i < len; i++) writing[i] = (writing_tmp >> ((len - 1 - i) * 8)) & 0xff; - ret = rtl2832_bulk_write(client, reg_start_addr, writing, len); + ret = regmap_bulk_write(dev->regmap, reg_start_addr, writing, len); if (ret) goto err; @@ -525,7 +488,8 @@ static int rtl2832_set_frontend(struct dvb_frontend *fe) } for (j = 0; j < sizeof(bw_params[0]); j++) { - ret = rtl2832_bulk_write(client, 0x11c + j, &bw_params[i][j], 1); + ret = regmap_bulk_write(dev->regmap, + 0x11c + j, &bw_params[i][j], 1); if (ret) goto err; } @@ -581,11 +545,11 @@ static int rtl2832_get_frontend(struct dvb_frontend *fe, if (dev->sleeping) return 0; - ret = rtl2832_bulk_read(client, 0x33c, buf, 2); + ret = regmap_bulk_read(dev->regmap, 0x33c, buf, 2); if (ret) goto err; - ret = rtl2832_bulk_read(client, 0x351, &buf[2], 1); + ret = regmap_bulk_read(dev->regmap, 0x351, &buf[2], 1); if (ret) goto err; @@ -716,7 +680,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status) /* signal strength */ if (dev->fe_status & FE_HAS_SIGNAL) { /* read digital AGC */ - ret = rtl2832_bulk_read(client, 0x305, &u8tmp, 1); + ret = regmap_bulk_read(dev->regmap, 0x305, &u8tmp, 1); if (ret) goto err; @@ -742,7 +706,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status) {87659938, 87659938, 87885178, 88241743}, }; - ret = rtl2832_bulk_read(client, 0x33c, &u8tmp, 1); + ret = regmap_bulk_read(dev->regmap, 0x33c, &u8tmp, 1); if (ret) goto err; @@ -754,7 +718,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status) if (hierarchy > HIERARCHY_NUM - 1) goto err; - ret = rtl2832_bulk_read(client, 0x40c, buf, 2); + ret = regmap_bulk_read(dev->regmap, 0x40c, buf, 2); if (ret) goto err; @@ -775,7 +739,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status) /* BER */ if (dev->fe_status & FE_HAS_LOCK) { - ret = rtl2832_bulk_read(client, 0x34e, buf, 2); + ret = regmap_bulk_read(dev->regmap, 0x34e, buf, 2); if (ret) goto err; @@ -825,8 +789,6 @@ static int rtl2832_read_ber(struct dvb_frontend *fe, u32 *ber) /* * I2C gate/mux/repeater logic - * We must use unlocked __i2c_transfer() here (through regmap) because of I2C - * adapter lock is already taken by tuner driver. * There is delay mechanism to avoid unneeded I2C gate open / close. Gate close * is delayed here a little bit in order to see if there is sequence of I2C * messages sent to same I2C bus. @@ -838,7 +800,7 @@ static void rtl2832_i2c_gate_work(struct work_struct *work) int ret; /* close gate */ - ret = rtl2832_update_bits(dev->client, 0x101, 0x08, 0x00); + ret = regmap_update_bits(dev->regmap, 0x101, 0x08, 0x00); if (ret) goto err; @@ -847,19 +809,16 @@ err: dev_dbg(&client->dev, "failed=%d\n", ret); } -static int rtl2832_select(struct i2c_adapter *adap, void *mux_priv, u32 chan_id) +static int rtl2832_select(struct i2c_mux_core *muxc, u32 chan_id) { - struct rtl2832_dev *dev = mux_priv; + struct rtl2832_dev *dev = i2c_mux_priv(muxc); struct i2c_client *client = dev->client; int ret; /* terminate possible gate closing */ cancel_delayed_work(&dev->i2c_gate_work); - /* - * I2C adapter lock is already taken and due to that we will use - * regmap_update_bits() which does not lock again I2C adapter. - */ + /* open gate */ ret = regmap_update_bits(dev->regmap, 0x101, 0x08, 0x08); if (ret) goto err; @@ -870,10 +829,9 @@ err: return ret; } -static int rtl2832_deselect(struct i2c_adapter *adap, void *mux_priv, - u32 chan_id) +static int rtl2832_deselect(struct i2c_mux_core *muxc, u32 chan_id) { - struct rtl2832_dev *dev = mux_priv; + struct rtl2832_dev *dev = i2c_mux_priv(muxc); schedule_delayed_work(&dev->i2c_gate_work, usecs_to_jiffies(100)); return 0; @@ -932,120 +890,6 @@ static bool rtl2832_volatile_reg(struct device *dev, unsigned int reg) return false; } -/* - * We implement own I2C access routines for regmap in order to get manual access - * to I2C adapter lock, which is needed for I2C mux adapter. - */ -static int rtl2832_regmap_read(void *context, const void *reg_buf, - size_t reg_size, void *val_buf, size_t val_size) -{ - struct i2c_client *client = context; - int ret; - struct i2c_msg msg[2] = { - { - .addr = client->addr, - .flags = 0, - .len = reg_size, - .buf = (u8 *)reg_buf, - }, { - .addr = client->addr, - .flags = I2C_M_RD, - .len = val_size, - .buf = val_buf, - } - }; - - ret = __i2c_transfer(client->adapter, msg, 2); - if (ret != 2) { - dev_warn(&client->dev, "i2c reg read failed %d reg %02x\n", - ret, *(u8 *)reg_buf); - if (ret >= 0) - ret = -EREMOTEIO; - return ret; - } - return 0; -} - -static int rtl2832_regmap_write(void *context, const void *data, size_t count) -{ - struct i2c_client *client = context; - int ret; - struct i2c_msg msg[1] = { - { - .addr = client->addr, - .flags = 0, - .len = count, - .buf = (u8 *)data, - } - }; - - ret = __i2c_transfer(client->adapter, msg, 1); - if (ret != 1) { - dev_warn(&client->dev, "i2c reg write failed %d reg %02x\n", - ret, *(u8 *)data); - if (ret >= 0) - ret = -EREMOTEIO; - return ret; - } - return 0; -} - -static int rtl2832_regmap_gather_write(void *context, const void *reg, - size_t reg_len, const void *val, - size_t val_len) -{ - struct i2c_client *client = context; - int ret; - u8 buf[256]; - struct i2c_msg msg[1] = { - { - .addr = client->addr, - .flags = 0, - .len = 1 + val_len, - .buf = buf, - } - }; - - buf[0] = *(u8 const *)reg; - memcpy(&buf[1], val, val_len); - - ret = __i2c_transfer(client->adapter, msg, 1); - if (ret != 1) { - dev_warn(&client->dev, "i2c reg write failed %d reg %02x\n", - ret, *(u8 const *)reg); - if (ret >= 0) - ret = -EREMOTEIO; - return ret; - } - return 0; -} - -/* - * FIXME: Hack. Implement own regmap locking in order to silence lockdep - * recursive lock warning. That happens when regmap I2C client calls I2C mux - * adapter, which leads demod I2C repeater enable via demod regmap. Operation - * takes two regmap locks recursively - but those are different regmap instances - * in a two different I2C drivers, so it is not deadlock. Proper fix is to make - * regmap aware of lockdep. - */ -static void rtl2832_regmap_lock(void *__dev) -{ - struct rtl2832_dev *dev = __dev; - struct i2c_client *client = dev->client; - - dev_dbg(&client->dev, "\n"); - mutex_lock(&dev->regmap_mutex); -} - -static void rtl2832_regmap_unlock(void *__dev) -{ - struct rtl2832_dev *dev = __dev; - struct i2c_client *client = dev->client; - - dev_dbg(&client->dev, "\n"); - mutex_unlock(&dev->regmap_mutex); -} - static struct dvb_frontend *rtl2832_get_dvb_frontend(struct i2c_client *client) { struct rtl2832_dev *dev = i2c_get_clientdata(client); @@ -1059,7 +903,7 @@ static struct i2c_adapter *rtl2832_get_i2c_adapter(struct i2c_client *client) struct rtl2832_dev *dev = i2c_get_clientdata(client); dev_dbg(&client->dev, "\n"); - return dev->i2c_adapter_tuner; + return dev->muxc->adapter[0]; } static int rtl2832_slave_ts_ctrl(struct i2c_client *client, bool enable) @@ -1073,29 +917,29 @@ static int rtl2832_slave_ts_ctrl(struct i2c_client *client, bool enable) ret = rtl2832_wr_demod_reg(dev, DVBT_SOFT_RST, 0x0); if (ret) goto err; - ret = rtl2832_bulk_write(client, 0x10c, "\x5f\xff", 2); + ret = regmap_bulk_write(dev->regmap, 0x10c, "\x5f\xff", 2); if (ret) goto err; ret = rtl2832_wr_demod_reg(dev, DVBT_PIP_ON, 0x1); if (ret) goto err; - ret = rtl2832_bulk_write(client, 0x0bc, "\x18", 1); + ret = regmap_bulk_write(dev->regmap, 0x0bc, "\x18", 1); if (ret) goto err; - ret = rtl2832_bulk_write(client, 0x192, "\x7f\xf7\xff", 3); + ret = regmap_bulk_write(dev->regmap, 0x192, "\x7f\xf7\xff", 3); if (ret) goto err; } else { - ret = rtl2832_bulk_write(client, 0x192, "\x00\x0f\xff", 3); + ret = regmap_bulk_write(dev->regmap, 0x192, "\x00\x0f\xff", 3); if (ret) goto err; - ret = rtl2832_bulk_write(client, 0x0bc, "\x08", 1); + ret = regmap_bulk_write(dev->regmap, 0x0bc, "\x08", 1); if (ret) goto err; ret = rtl2832_wr_demod_reg(dev, DVBT_PIP_ON, 0x0); if (ret) goto err; - ret = rtl2832_bulk_write(client, 0x10c, "\x00\x00", 2); + ret = regmap_bulk_write(dev->regmap, 0x10c, "\x00\x00", 2); if (ret) goto err; ret = rtl2832_wr_demod_reg(dev, DVBT_SOFT_RST, 0x1); @@ -1124,7 +968,7 @@ static int rtl2832_pid_filter_ctrl(struct dvb_frontend *fe, int onoff) else u8tmp = 0x00; - ret = rtl2832_update_bits(client, 0x061, 0xc0, u8tmp); + ret = regmap_update_bits(dev->regmap, 0x061, 0xc0, u8tmp); if (ret) goto err; @@ -1159,14 +1003,14 @@ static int rtl2832_pid_filter(struct dvb_frontend *fe, u8 index, u16 pid, buf[1] = (dev->filters >> 8) & 0xff; buf[2] = (dev->filters >> 16) & 0xff; buf[3] = (dev->filters >> 24) & 0xff; - ret = rtl2832_bulk_write(client, 0x062, buf, 4); + ret = regmap_bulk_write(dev->regmap, 0x062, buf, 4); if (ret) goto err; /* add PID */ buf[0] = (pid >> 8) & 0xff; buf[1] = (pid >> 0) & 0xff; - ret = rtl2832_bulk_write(client, 0x066 + 2 * index, buf, 2); + ret = regmap_bulk_write(dev->regmap, 0x066 + 2 * index, buf, 2); if (ret) goto err; @@ -1184,12 +1028,6 @@ static int rtl2832_probe(struct i2c_client *client, struct rtl2832_dev *dev; int ret; u8 tmp; - static const struct regmap_bus regmap_bus = { - .read = rtl2832_regmap_read, - .write = rtl2832_regmap_write, - .gather_write = rtl2832_regmap_gather_write, - .val_format_endian_default = REGMAP_ENDIAN_NATIVE, - }; static const struct regmap_range_cfg regmap_range_cfg[] = { { .selector_reg = 0x00, @@ -1218,36 +1056,35 @@ static int rtl2832_probe(struct i2c_client *client, dev->sleeping = true; INIT_DELAYED_WORK(&dev->i2c_gate_work, rtl2832_i2c_gate_work); /* create regmap */ - mutex_init(&dev->regmap_mutex); dev->regmap_config.reg_bits = 8, dev->regmap_config.val_bits = 8, - dev->regmap_config.lock = rtl2832_regmap_lock, - dev->regmap_config.unlock = rtl2832_regmap_unlock, - dev->regmap_config.lock_arg = dev, dev->regmap_config.volatile_reg = rtl2832_volatile_reg, dev->regmap_config.max_register = 5 * 0x100, dev->regmap_config.ranges = regmap_range_cfg, dev->regmap_config.num_ranges = ARRAY_SIZE(regmap_range_cfg), dev->regmap_config.cache_type = REGCACHE_NONE, - dev->regmap = regmap_init(&client->dev, ®map_bus, client, - &dev->regmap_config); + dev->regmap = regmap_init_i2c(client, &dev->regmap_config); if (IS_ERR(dev->regmap)) { ret = PTR_ERR(dev->regmap); goto err_kfree; } /* check if the demod is there */ - ret = rtl2832_bulk_read(client, 0x000, &tmp, 1); + ret = regmap_bulk_read(dev->regmap, 0x000, &tmp, 1); if (ret) goto err_regmap_exit; /* create muxed i2c adapter for demod tuner bus */ - dev->i2c_adapter_tuner = i2c_add_mux_adapter(i2c, &i2c->dev, dev, - 0, 0, 0, rtl2832_select, rtl2832_deselect); - if (dev->i2c_adapter_tuner == NULL) { - ret = -ENODEV; + dev->muxc = i2c_mux_alloc(i2c, &i2c->dev, 1, 0, I2C_MUX_LOCKED, + rtl2832_select, rtl2832_deselect); + if (!dev->muxc) { + ret = -ENOMEM; goto err_regmap_exit; } + dev->muxc->priv = dev; + ret = i2c_mux_add_adapter(dev->muxc, 0, 0, 0); + if (ret) + goto err_regmap_exit; /* create dvb_frontend */ memcpy(&dev->fe.ops, &rtl2832_ops, sizeof(struct dvb_frontend_ops)); @@ -1259,9 +1096,7 @@ static int rtl2832_probe(struct i2c_client *client, pdata->slave_ts_ctrl = rtl2832_slave_ts_ctrl; pdata->pid_filter = rtl2832_pid_filter; pdata->pid_filter_ctrl = rtl2832_pid_filter_ctrl; - pdata->bulk_read = rtl2832_bulk_read; - pdata->bulk_write = rtl2832_bulk_write; - pdata->update_bits = rtl2832_update_bits; + pdata->regmap = dev->regmap; dev_info(&client->dev, "Realtek RTL2832 successfully attached\n"); return 0; @@ -1282,7 +1117,7 @@ static int rtl2832_remove(struct i2c_client *client) cancel_delayed_work_sync(&dev->i2c_gate_work); - i2c_del_mux_adapter(dev->i2c_adapter_tuner); + i2c_mux_del_adapters(dev->muxc); regmap_exit(dev->regmap); diff --git a/drivers/media/dvb-frontends/rtl2832.h b/drivers/media/dvb-frontends/rtl2832.h index 6390af64cf45..03c0de039fa9 100644 --- a/drivers/media/dvb-frontends/rtl2832.h +++ b/drivers/media/dvb-frontends/rtl2832.h @@ -57,9 +57,7 @@ struct rtl2832_platform_data { int (*pid_filter)(struct dvb_frontend *, u8, u16, int); int (*pid_filter_ctrl)(struct dvb_frontend *, int); /* private: Register access for SDR module use only */ - int (*bulk_read)(struct i2c_client *, unsigned int, void *, size_t); - int (*bulk_write)(struct i2c_client *, unsigned int, const void *, size_t); - int (*update_bits)(struct i2c_client *, unsigned int, unsigned int, unsigned int); + struct regmap *regmap; }; #endif /* RTL2832_H */ diff --git a/drivers/media/dvb-frontends/rtl2832_priv.h b/drivers/media/dvb-frontends/rtl2832_priv.h index 6b875f462f8b..c1a8a69e9015 100644 --- a/drivers/media/dvb-frontends/rtl2832_priv.h +++ b/drivers/media/dvb-frontends/rtl2832_priv.h @@ -33,10 +33,9 @@ struct rtl2832_dev { struct rtl2832_platform_data *pdata; struct i2c_client *client; - struct mutex regmap_mutex; struct regmap_config regmap_config; struct regmap *regmap; - struct i2c_adapter *i2c_adapter_tuner; + struct i2c_mux_core *muxc; struct dvb_frontend fe; enum fe_status fe_status; u64 post_bit_error_prev; /* for old DVBv3 read_ber() calculation */ diff --git a/drivers/media/dvb-frontends/rtl2832_sdr.c b/drivers/media/dvb-frontends/rtl2832_sdr.c index b860f02a4e55..47a480a7d46c 100644 --- a/drivers/media/dvb-frontends/rtl2832_sdr.c +++ b/drivers/media/dvb-frontends/rtl2832_sdr.c @@ -35,6 +35,7 @@ #include <linux/platform_device.h> #include <linux/jiffies.h> #include <linux/math64.h> +#include <linux/regmap.h> static bool rtl2832_sdr_emulated_fmt; module_param_named(emulated_formats, rtl2832_sdr_emulated_fmt, bool, 0644); @@ -119,6 +120,7 @@ struct rtl2832_sdr_dev { unsigned long flags; struct platform_device *pdev; + struct regmap *regmap; struct video_device vdev; struct v4l2_device v4l2_dev; @@ -163,47 +165,6 @@ struct rtl2832_sdr_dev { unsigned long jiffies_next; }; -/* write multiple registers */ -static int rtl2832_sdr_wr_regs(struct rtl2832_sdr_dev *dev, u16 reg, - const u8 *val, int len) -{ - struct platform_device *pdev = dev->pdev; - struct rtl2832_sdr_platform_data *pdata = pdev->dev.platform_data; - struct i2c_client *client = pdata->i2c_client; - - return pdata->bulk_write(client, reg, val, len); -} - -#if 0 -/* read multiple registers */ -static int rtl2832_sdr_rd_regs(struct rtl2832_sdr_dev *dev, u16 reg, u8 *val, - int len) -{ - struct platform_device *pdev = dev->pdev; - struct rtl2832_sdr_platform_data *pdata = pdev->dev.platform_data; - struct i2c_client *client = pdata->i2c_client; - - return pdata->bulk_read(client, reg, val, len); -} -#endif - -/* write single register */ -static int rtl2832_sdr_wr_reg(struct rtl2832_sdr_dev *dev, u16 reg, u8 val) -{ - return rtl2832_sdr_wr_regs(dev, reg, &val, 1); -} - -/* write single register with mask */ -static int rtl2832_sdr_wr_reg_mask(struct rtl2832_sdr_dev *dev, u16 reg, - u8 val, u8 mask) -{ - struct platform_device *pdev = dev->pdev; - struct rtl2832_sdr_platform_data *pdata = pdev->dev.platform_data; - struct i2c_client *client = pdata->i2c_client; - - return pdata->update_bits(client, reg, mask, val); -} - /* Private functions */ static struct rtl2832_sdr_frame_buf *rtl2832_sdr_get_next_fill_buf( struct rtl2832_sdr_dev *dev) @@ -558,11 +519,11 @@ static int rtl2832_sdr_set_adc(struct rtl2832_sdr_dev *dev) f_sr = dev->f_adc; - ret = rtl2832_sdr_wr_regs(dev, 0x13e, "\x00\x00", 2); + ret = regmap_bulk_write(dev->regmap, 0x13e, "\x00\x00", 2); if (ret) goto err; - ret = rtl2832_sdr_wr_regs(dev, 0x115, "\x00\x00\x00\x00", 4); + ret = regmap_bulk_write(dev->regmap, 0x115, "\x00\x00\x00\x00", 4); if (ret) goto err; @@ -588,7 +549,7 @@ static int rtl2832_sdr_set_adc(struct rtl2832_sdr_dev *dev) buf[1] = (u32tmp >> 8) & 0xff; buf[2] = (u32tmp >> 0) & 0xff; - ret = rtl2832_sdr_wr_regs(dev, 0x119, buf, 3); + ret = regmap_bulk_write(dev->regmap, 0x119, buf, 3); if (ret) goto err; @@ -602,15 +563,15 @@ static int rtl2832_sdr_set_adc(struct rtl2832_sdr_dev *dev) u8tmp2 = 0xcd; /* enable ADC I, ADC Q */ } - ret = rtl2832_sdr_wr_reg(dev, 0x1b1, u8tmp1); + ret = regmap_write(dev->regmap, 0x1b1, u8tmp1); if (ret) goto err; - ret = rtl2832_sdr_wr_reg(dev, 0x008, u8tmp2); + ret = regmap_write(dev->regmap, 0x008, u8tmp2); if (ret) goto err; - ret = rtl2832_sdr_wr_reg(dev, 0x006, 0x80); + ret = regmap_write(dev->regmap, 0x006, 0x80); if (ret) goto err; @@ -621,168 +582,169 @@ static int rtl2832_sdr_set_adc(struct rtl2832_sdr_dev *dev) buf[1] = (u32tmp >> 16) & 0xff; buf[2] = (u32tmp >> 8) & 0xff; buf[3] = (u32tmp >> 0) & 0xff; - ret = rtl2832_sdr_wr_regs(dev, 0x19f, buf, 4); + ret = regmap_bulk_write(dev->regmap, 0x19f, buf, 4); if (ret) goto err; /* low-pass filter */ - ret = rtl2832_sdr_wr_regs(dev, 0x11c, - "\xca\xdc\xd7\xd8\xe0\xf2\x0e\x35\x06\x50\x9c\x0d\x71\x11\x14\x71\x74\x19\x41\xa5", - 20); + ret = regmap_bulk_write(dev->regmap, 0x11c, + "\xca\xdc\xd7\xd8\xe0\xf2\x0e\x35\x06\x50\x9c\x0d\x71\x11\x14\x71\x74\x19\x41\xa5", + 20); if (ret) goto err; - ret = rtl2832_sdr_wr_regs(dev, 0x017, "\x11\x10", 2); + ret = regmap_bulk_write(dev->regmap, 0x017, "\x11\x10", 2); if (ret) goto err; /* mode */ - ret = rtl2832_sdr_wr_regs(dev, 0x019, "\x05", 1); + ret = regmap_write(dev->regmap, 0x019, 0x05); if (ret) goto err; - ret = rtl2832_sdr_wr_regs(dev, 0x01a, "\x1b\x16\x0d\x06\x01\xff", 6); + ret = regmap_bulk_write(dev->regmap, 0x01a, + "\x1b\x16\x0d\x06\x01\xff", 6); if (ret) goto err; /* FSM */ - ret = rtl2832_sdr_wr_regs(dev, 0x192, "\x00\xf0\x0f", 3); + ret = regmap_bulk_write(dev->regmap, 0x192, "\x00\xf0\x0f", 3); if (ret) goto err; /* PID filter */ - ret = rtl2832_sdr_wr_regs(dev, 0x061, "\x60", 1); + ret = regmap_write(dev->regmap, 0x061, 0x60); if (ret) goto err; /* used RF tuner based settings */ switch (pdata->tuner) { case RTL2832_SDR_TUNER_E4000: - ret = rtl2832_sdr_wr_regs(dev, 0x112, "\x5a", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x102, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x103, "\x5a", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c7, "\x30", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x104, "\xd0", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x105, "\xbe", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c8, "\x18", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x106, "\x35", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c9, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ca, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cb, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x107, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cd, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ce, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x108, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x109, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10a, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10b, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x011, "\xd4", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1e5, "\xf0", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1d9, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1db, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1dd, "\x14", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1de, "\xec", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1d8, "\x0c", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1e6, "\x02", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1d7, "\x09", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00d, "\x83", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x010, "\x49", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00d, "\x87", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00d, "\x85", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x013, "\x02", 1); + ret = regmap_write(dev->regmap, 0x112, 0x5a); + ret = regmap_write(dev->regmap, 0x102, 0x40); + ret = regmap_write(dev->regmap, 0x103, 0x5a); + ret = regmap_write(dev->regmap, 0x1c7, 0x30); + ret = regmap_write(dev->regmap, 0x104, 0xd0); + ret = regmap_write(dev->regmap, 0x105, 0xbe); + ret = regmap_write(dev->regmap, 0x1c8, 0x18); + ret = regmap_write(dev->regmap, 0x106, 0x35); + ret = regmap_write(dev->regmap, 0x1c9, 0x21); + ret = regmap_write(dev->regmap, 0x1ca, 0x21); + ret = regmap_write(dev->regmap, 0x1cb, 0x00); + ret = regmap_write(dev->regmap, 0x107, 0x40); + ret = regmap_write(dev->regmap, 0x1cd, 0x10); + ret = regmap_write(dev->regmap, 0x1ce, 0x10); + ret = regmap_write(dev->regmap, 0x108, 0x80); + ret = regmap_write(dev->regmap, 0x109, 0x7f); + ret = regmap_write(dev->regmap, 0x10a, 0x80); + ret = regmap_write(dev->regmap, 0x10b, 0x7f); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_write(dev->regmap, 0x011, 0xd4); + ret = regmap_write(dev->regmap, 0x1e5, 0xf0); + ret = regmap_write(dev->regmap, 0x1d9, 0x00); + ret = regmap_write(dev->regmap, 0x1db, 0x00); + ret = regmap_write(dev->regmap, 0x1dd, 0x14); + ret = regmap_write(dev->regmap, 0x1de, 0xec); + ret = regmap_write(dev->regmap, 0x1d8, 0x0c); + ret = regmap_write(dev->regmap, 0x1e6, 0x02); + ret = regmap_write(dev->regmap, 0x1d7, 0x09); + ret = regmap_write(dev->regmap, 0x00d, 0x83); + ret = regmap_write(dev->regmap, 0x010, 0x49); + ret = regmap_write(dev->regmap, 0x00d, 0x87); + ret = regmap_write(dev->regmap, 0x00d, 0x85); + ret = regmap_write(dev->regmap, 0x013, 0x02); break; case RTL2832_SDR_TUNER_FC0012: case RTL2832_SDR_TUNER_FC0013: - ret = rtl2832_sdr_wr_regs(dev, 0x112, "\x5a", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x102, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x103, "\x5a", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c7, "\x2c", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x104, "\xcc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x105, "\xbe", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c8, "\x16", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x106, "\x35", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c9, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ca, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cb, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x107, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cd, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ce, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x108, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x109, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10a, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10b, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x011, "\xe9\xbf", 2); - ret = rtl2832_sdr_wr_regs(dev, 0x1e5, "\xf0", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1d9, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1db, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1dd, "\x11", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1de, "\xef", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1d8, "\x0c", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1e6, "\x02", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1d7, "\x09", 1); + ret = regmap_write(dev->regmap, 0x112, 0x5a); + ret = regmap_write(dev->regmap, 0x102, 0x40); + ret = regmap_write(dev->regmap, 0x103, 0x5a); + ret = regmap_write(dev->regmap, 0x1c7, 0x2c); + ret = regmap_write(dev->regmap, 0x104, 0xcc); + ret = regmap_write(dev->regmap, 0x105, 0xbe); + ret = regmap_write(dev->regmap, 0x1c8, 0x16); + ret = regmap_write(dev->regmap, 0x106, 0x35); + ret = regmap_write(dev->regmap, 0x1c9, 0x21); + ret = regmap_write(dev->regmap, 0x1ca, 0x21); + ret = regmap_write(dev->regmap, 0x1cb, 0x00); + ret = regmap_write(dev->regmap, 0x107, 0x40); + ret = regmap_write(dev->regmap, 0x1cd, 0x10); + ret = regmap_write(dev->regmap, 0x1ce, 0x10); + ret = regmap_write(dev->regmap, 0x108, 0x80); + ret = regmap_write(dev->regmap, 0x109, 0x7f); + ret = regmap_write(dev->regmap, 0x10a, 0x80); + ret = regmap_write(dev->regmap, 0x10b, 0x7f); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_bulk_write(dev->regmap, 0x011, "\xe9\xbf", 2); + ret = regmap_write(dev->regmap, 0x1e5, 0xf0); + ret = regmap_write(dev->regmap, 0x1d9, 0x00); + ret = regmap_write(dev->regmap, 0x1db, 0x00); + ret = regmap_write(dev->regmap, 0x1dd, 0x11); + ret = regmap_write(dev->regmap, 0x1de, 0xef); + ret = regmap_write(dev->regmap, 0x1d8, 0x0c); + ret = regmap_write(dev->regmap, 0x1e6, 0x02); + ret = regmap_write(dev->regmap, 0x1d7, 0x09); break; case RTL2832_SDR_TUNER_R820T: case RTL2832_SDR_TUNER_R828D: - ret = rtl2832_sdr_wr_regs(dev, 0x112, "\x5a", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x102, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x115, "\x01", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x103, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c7, "\x24", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x104, "\xcc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x105, "\xbe", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c8, "\x14", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x106, "\x35", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c9, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ca, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cb, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x107, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cd, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ce, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x108, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x109, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10a, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10b, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x011, "\xf4", 1); + ret = regmap_write(dev->regmap, 0x112, 0x5a); + ret = regmap_write(dev->regmap, 0x102, 0x40); + ret = regmap_write(dev->regmap, 0x115, 0x01); + ret = regmap_write(dev->regmap, 0x103, 0x80); + ret = regmap_write(dev->regmap, 0x1c7, 0x24); + ret = regmap_write(dev->regmap, 0x104, 0xcc); + ret = regmap_write(dev->regmap, 0x105, 0xbe); + ret = regmap_write(dev->regmap, 0x1c8, 0x14); + ret = regmap_write(dev->regmap, 0x106, 0x35); + ret = regmap_write(dev->regmap, 0x1c9, 0x21); + ret = regmap_write(dev->regmap, 0x1ca, 0x21); + ret = regmap_write(dev->regmap, 0x1cb, 0x00); + ret = regmap_write(dev->regmap, 0x107, 0x40); + ret = regmap_write(dev->regmap, 0x1cd, 0x10); + ret = regmap_write(dev->regmap, 0x1ce, 0x10); + ret = regmap_write(dev->regmap, 0x108, 0x80); + ret = regmap_write(dev->regmap, 0x109, 0x7f); + ret = regmap_write(dev->regmap, 0x10a, 0x80); + ret = regmap_write(dev->regmap, 0x10b, 0x7f); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_write(dev->regmap, 0x011, 0xf4); break; case RTL2832_SDR_TUNER_FC2580: - ret = rtl2832_sdr_wr_regs(dev, 0x112, "\x39", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x102, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x103, "\x5a", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c7, "\x2c", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x104, "\xcc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x105, "\xbe", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c8, "\x16", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x106, "\x35", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1c9, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ca, "\x21", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cb, "\x00", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x107, "\x40", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1cd, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x1ce, "\x10", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x108, "\x80", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x109, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10a, "\x9c", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x10b, "\x7f", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x00e, "\xfc", 1); - ret = rtl2832_sdr_wr_regs(dev, 0x011, "\xe9\xf4", 2); + ret = regmap_write(dev->regmap, 0x112, 0x39); + ret = regmap_write(dev->regmap, 0x102, 0x40); + ret = regmap_write(dev->regmap, 0x103, 0x5a); + ret = regmap_write(dev->regmap, 0x1c7, 0x2c); + ret = regmap_write(dev->regmap, 0x104, 0xcc); + ret = regmap_write(dev->regmap, 0x105, 0xbe); + ret = regmap_write(dev->regmap, 0x1c8, 0x16); + ret = regmap_write(dev->regmap, 0x106, 0x35); + ret = regmap_write(dev->regmap, 0x1c9, 0x21); + ret = regmap_write(dev->regmap, 0x1ca, 0x21); + ret = regmap_write(dev->regmap, 0x1cb, 0x00); + ret = regmap_write(dev->regmap, 0x107, 0x40); + ret = regmap_write(dev->regmap, 0x1cd, 0x10); + ret = regmap_write(dev->regmap, 0x1ce, 0x10); + ret = regmap_write(dev->regmap, 0x108, 0x80); + ret = regmap_write(dev->regmap, 0x109, 0x7f); + ret = regmap_write(dev->regmap, 0x10a, 0x9c); + ret = regmap_write(dev->regmap, 0x10b, 0x7f); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_write(dev->regmap, 0x00e, 0xfc); + ret = regmap_bulk_write(dev->regmap, 0x011, "\xe9\xf4", 2); break; default: dev_notice(&pdev->dev, "Unsupported tuner\n"); } /* software reset */ - ret = rtl2832_sdr_wr_reg_mask(dev, 0x101, 0x04, 0x04); + ret = regmap_update_bits(dev->regmap, 0x101, 0x04, 0x04); if (ret) goto err; - ret = rtl2832_sdr_wr_reg_mask(dev, 0x101, 0x00, 0x04); + ret = regmap_update_bits(dev->regmap, 0x101, 0x04, 0x00); if (ret) goto err; err: @@ -797,29 +759,29 @@ static void rtl2832_sdr_unset_adc(struct rtl2832_sdr_dev *dev) dev_dbg(&pdev->dev, "\n"); /* PID filter */ - ret = rtl2832_sdr_wr_regs(dev, 0x061, "\xe0", 1); + ret = regmap_write(dev->regmap, 0x061, 0xe0); if (ret) goto err; /* mode */ - ret = rtl2832_sdr_wr_regs(dev, 0x019, "\x20", 1); + ret = regmap_write(dev->regmap, 0x019, 0x20); if (ret) goto err; - ret = rtl2832_sdr_wr_regs(dev, 0x017, "\x11\x10", 2); + ret = regmap_bulk_write(dev->regmap, 0x017, "\x11\x10", 2); if (ret) goto err; /* FSM */ - ret = rtl2832_sdr_wr_regs(dev, 0x192, "\x00\x0f\xff", 3); + ret = regmap_bulk_write(dev->regmap, 0x192, "\x00\x0f\xff", 3); if (ret) goto err; - ret = rtl2832_sdr_wr_regs(dev, 0x13e, "\x40\x00", 2); + ret = regmap_bulk_write(dev->regmap, 0x13e, "\x40\x00", 2); if (ret) goto err; - ret = rtl2832_sdr_wr_regs(dev, 0x115, "\x06\x3f\xce\xcc", 4); + ret = regmap_bulk_write(dev->regmap, 0x115, "\x06\x3f\xce\xcc", 4); if (ret) goto err; err: @@ -1399,6 +1361,7 @@ static int rtl2832_sdr_probe(struct platform_device *pdev) subdev = pdata->v4l2_subdev; dev->v4l2_subdev = pdata->v4l2_subdev; dev->pdev = pdev; + dev->regmap = pdata->regmap; dev->udev = pdata->dvb_usb_device->udev; dev->f_adc = bands_adc[0].rangelow; dev->f_tuner = bands_fm[0].rangelow; diff --git a/drivers/media/dvb-frontends/rtl2832_sdr.h b/drivers/media/dvb-frontends/rtl2832_sdr.h index 342ea84860df..d8fc7e7212e3 100644 --- a/drivers/media/dvb-frontends/rtl2832_sdr.h +++ b/drivers/media/dvb-frontends/rtl2832_sdr.h @@ -56,10 +56,7 @@ struct rtl2832_sdr_platform_data { #define RTL2832_SDR_TUNER_R828D 0x2b u8 tuner; - struct i2c_client *i2c_client; - int (*bulk_read)(struct i2c_client *, unsigned int, void *, size_t); - int (*bulk_write)(struct i2c_client *, unsigned int, const void *, size_t); - int (*update_bits)(struct i2c_client *, unsigned int, unsigned int, unsigned int); + struct regmap *regmap; struct dvb_frontend *dvb_frontend; struct v4l2_subdev *v4l2_subdev; struct dvb_usb_device *dvb_usb_device; diff --git a/drivers/media/dvb-frontends/si2168.c b/drivers/media/dvb-frontends/si2168.c index 821a8f481507..108a069fa1ae 100644 --- a/drivers/media/dvb-frontends/si2168.c +++ b/drivers/media/dvb-frontends/si2168.c @@ -18,53 +18,23 @@ static const struct dvb_frontend_ops si2168_ops; -/* Own I2C adapter locking is needed because of I2C gate logic. */ -static int si2168_i2c_master_send_unlocked(const struct i2c_client *client, - const char *buf, int count) -{ - int ret; - struct i2c_msg msg = { - .addr = client->addr, - .flags = 0, - .len = count, - .buf = (char *)buf, - }; - - ret = __i2c_transfer(client->adapter, &msg, 1); - return (ret == 1) ? count : ret; -} - -static int si2168_i2c_master_recv_unlocked(const struct i2c_client *client, - char *buf, int count) -{ - int ret; - struct i2c_msg msg = { - .addr = client->addr, - .flags = I2C_M_RD, - .len = count, - .buf = buf, - }; - - ret = __i2c_transfer(client->adapter, &msg, 1); - return (ret == 1) ? count : ret; -} - /* execute firmware command */ -static int si2168_cmd_execute_unlocked(struct i2c_client *client, - struct si2168_cmd *cmd) +static int si2168_cmd_execute(struct i2c_client *client, struct si2168_cmd *cmd) { + struct si2168_dev *dev = i2c_get_clientdata(client); int ret; unsigned long timeout; + mutex_lock(&dev->i2c_mutex); + if (cmd->wlen) { /* write cmd and args for firmware */ - ret = si2168_i2c_master_send_unlocked(client, cmd->args, - cmd->wlen); + ret = i2c_master_send(client, cmd->args, cmd->wlen); if (ret < 0) { - goto err; + goto err_mutex_unlock; } else if (ret != cmd->wlen) { ret = -EREMOTEIO; - goto err; + goto err_mutex_unlock; } } @@ -73,13 +43,12 @@ static int si2168_cmd_execute_unlocked(struct i2c_client *client, #define TIMEOUT 70 timeout = jiffies + msecs_to_jiffies(TIMEOUT); while (!time_after(jiffies, timeout)) { - ret = si2168_i2c_master_recv_unlocked(client, cmd->args, - cmd->rlen); + ret = i2c_master_recv(client, cmd->args, cmd->rlen); if (ret < 0) { - goto err; + goto err_mutex_unlock; } else if (ret != cmd->rlen) { ret = -EREMOTEIO; - goto err; + goto err_mutex_unlock; } /* firmware ready? */ @@ -94,32 +63,23 @@ static int si2168_cmd_execute_unlocked(struct i2c_client *client, /* error bit set? */ if ((cmd->args[0] >> 6) & 0x01) { ret = -EREMOTEIO; - goto err; + goto err_mutex_unlock; } if (!((cmd->args[0] >> 7) & 0x01)) { ret = -ETIMEDOUT; - goto err; + goto err_mutex_unlock; } } + mutex_unlock(&dev->i2c_mutex); return 0; -err: +err_mutex_unlock: + mutex_unlock(&dev->i2c_mutex); dev_dbg(&client->dev, "failed=%d\n", ret); return ret; } -static int si2168_cmd_execute(struct i2c_client *client, struct si2168_cmd *cmd) -{ - int ret; - - i2c_lock_adapter(client->adapter); - ret = si2168_cmd_execute_unlocked(client, cmd); - i2c_unlock_adapter(client->adapter); - - return ret; -} - static int si2168_read_status(struct dvb_frontend *fe, enum fe_status *status) { struct i2c_client *client = fe->demodulator_priv; @@ -610,14 +570,9 @@ static int si2168_get_tune_settings(struct dvb_frontend *fe, return 0; } -/* - * I2C gate logic - * We must use unlocked I2C I/O because I2C adapter lock is already taken - * by the caller (usually tuner driver). - */ -static int si2168_select(struct i2c_adapter *adap, void *mux_priv, u32 chan) +static int si2168_select(struct i2c_mux_core *muxc, u32 chan) { - struct i2c_client *client = mux_priv; + struct i2c_client *client = i2c_mux_priv(muxc); int ret; struct si2168_cmd cmd; @@ -625,7 +580,7 @@ static int si2168_select(struct i2c_adapter *adap, void *mux_priv, u32 chan) memcpy(cmd.args, "\xc0\x0d\x01", 3); cmd.wlen = 3; cmd.rlen = 0; - ret = si2168_cmd_execute_unlocked(client, &cmd); + ret = si2168_cmd_execute(client, &cmd); if (ret) goto err; @@ -635,9 +590,9 @@ err: return ret; } -static int si2168_deselect(struct i2c_adapter *adap, void *mux_priv, u32 chan) +static int si2168_deselect(struct i2c_mux_core *muxc, u32 chan) { - struct i2c_client *client = mux_priv; + struct i2c_client *client = i2c_mux_priv(muxc); int ret; struct si2168_cmd cmd; @@ -645,7 +600,7 @@ static int si2168_deselect(struct i2c_adapter *adap, void *mux_priv, u32 chan) memcpy(cmd.args, "\xc0\x0d\x00", 3); cmd.wlen = 3; cmd.rlen = 0; - ret = si2168_cmd_execute_unlocked(client, &cmd); + ret = si2168_cmd_execute(client, &cmd); if (ret) goto err; @@ -708,18 +663,25 @@ static int si2168_probe(struct i2c_client *client, goto err; } + mutex_init(&dev->i2c_mutex); + /* create mux i2c adapter for tuner */ - dev->adapter = i2c_add_mux_adapter(client->adapter, &client->dev, - client, 0, 0, 0, si2168_select, si2168_deselect); - if (dev->adapter == NULL) { - ret = -ENODEV; + dev->muxc = i2c_mux_alloc(client->adapter, &client->dev, + 1, 0, I2C_MUX_LOCKED, + si2168_select, si2168_deselect); + if (!dev->muxc) { + ret = -ENOMEM; goto err_kfree; } + dev->muxc->priv = client; + ret = i2c_mux_add_adapter(dev->muxc, 0, 0, 0); + if (ret) + goto err_kfree; /* create dvb_frontend */ memcpy(&dev->fe.ops, &si2168_ops, sizeof(struct dvb_frontend_ops)); dev->fe.demodulator_priv = client; - *config->i2c_adapter = dev->adapter; + *config->i2c_adapter = dev->muxc->adapter[0]; *config->fe = &dev->fe; dev->ts_mode = config->ts_mode; dev->ts_clock_inv = config->ts_clock_inv; @@ -743,7 +705,7 @@ static int si2168_remove(struct i2c_client *client) dev_dbg(&client->dev, "\n"); - i2c_del_mux_adapter(dev->adapter); + i2c_mux_del_adapters(dev->muxc); dev->fe.ops.release = NULL; dev->fe.demodulator_priv = NULL; diff --git a/drivers/media/dvb-frontends/si2168_priv.h b/drivers/media/dvb-frontends/si2168_priv.h index c07e6fe2cb10..8a1f36d2014d 100644 --- a/drivers/media/dvb-frontends/si2168_priv.h +++ b/drivers/media/dvb-frontends/si2168_priv.h @@ -29,7 +29,8 @@ /* state struct */ struct si2168_dev { - struct i2c_adapter *adapter; + struct mutex i2c_mutex; + struct i2c_mux_core *muxc; struct dvb_frontend fe; enum fe_delivery_system delivery_system; enum fe_status fe_status; diff --git a/drivers/media/usb/cx231xx/cx231xx-core.c b/drivers/media/usb/cx231xx/cx231xx-core.c index 6741fd02b50f..630f4fc5155f 100644 --- a/drivers/media/usb/cx231xx/cx231xx-core.c +++ b/drivers/media/usb/cx231xx/cx231xx-core.c @@ -1305,6 +1305,9 @@ int cx231xx_dev_init(struct cx231xx *dev) cx231xx_i2c_register(&dev->i2c_bus[1]); cx231xx_i2c_register(&dev->i2c_bus[2]); + errCode = cx231xx_i2c_mux_create(dev); + if (errCode < 0) + return errCode; cx231xx_i2c_mux_register(dev, 0); cx231xx_i2c_mux_register(dev, 1); @@ -1427,8 +1430,7 @@ EXPORT_SYMBOL_GPL(cx231xx_dev_init); void cx231xx_dev_uninit(struct cx231xx *dev) { /* Un Initialize I2C bus */ - cx231xx_i2c_mux_unregister(dev, 1); - cx231xx_i2c_mux_unregister(dev, 0); + cx231xx_i2c_mux_unregister(dev); cx231xx_i2c_unregister(&dev->i2c_bus[2]); cx231xx_i2c_unregister(&dev->i2c_bus[1]); cx231xx_i2c_unregister(&dev->i2c_bus[0]); diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c index a29c345b027d..473cd3433fe5 100644 --- a/drivers/media/usb/cx231xx/cx231xx-i2c.c +++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c @@ -557,40 +557,41 @@ int cx231xx_i2c_unregister(struct cx231xx_i2c *bus) * cx231xx_i2c_mux_select() * switch i2c master number 1 between port1 and port3 */ -static int cx231xx_i2c_mux_select(struct i2c_adapter *adap, - void *mux_priv, u32 chan_id) +static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id) { - struct cx231xx *dev = mux_priv; + struct cx231xx *dev = i2c_mux_priv(muxc); return cx231xx_enable_i2c_port_3(dev, chan_id); } +int cx231xx_i2c_mux_create(struct cx231xx *dev) +{ + dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0, + cx231xx_i2c_mux_select, NULL); + if (!dev->muxc) + return -ENOMEM; + dev->muxc->priv = dev; + return 0; +} + int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no) { - struct i2c_adapter *i2c_parent = &dev->i2c_bus[1].i2c_adap; - /* what is the correct mux_dev? */ - struct device *mux_dev = dev->dev; - - dev->i2c_mux_adap[mux_no] = i2c_add_mux_adapter(i2c_parent, - mux_dev, - dev /* mux_priv */, - 0, - mux_no /* chan_id */, - 0 /* class */, - &cx231xx_i2c_mux_select, - NULL); - - if (!dev->i2c_mux_adap[mux_no]) + int rc; + + rc = i2c_mux_add_adapter(dev->muxc, + 0, + mux_no /* chan_id */, + 0 /* class */); + if (rc) dev_warn(dev->dev, "i2c mux %d register FAILED\n", mux_no); - return 0; + return rc; } -void cx231xx_i2c_mux_unregister(struct cx231xx *dev, int mux_no) +void cx231xx_i2c_mux_unregister(struct cx231xx *dev) { - i2c_del_mux_adapter(dev->i2c_mux_adap[mux_no]); - dev->i2c_mux_adap[mux_no] = NULL; + i2c_mux_del_adapters(dev->muxc); } struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port) @@ -603,9 +604,9 @@ struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port) case I2C_2: return &dev->i2c_bus[2].i2c_adap; case I2C_1_MUX_1: - return dev->i2c_mux_adap[0]; + return dev->muxc->adapter[0]; case I2C_1_MUX_3: - return dev->i2c_mux_adap[1]; + return dev->muxc->adapter[1]; default: return NULL; } diff --git a/drivers/media/usb/cx231xx/cx231xx.h b/drivers/media/usb/cx231xx/cx231xx.h index 69f6d20870f5..90c867683076 100644 --- a/drivers/media/usb/cx231xx/cx231xx.h +++ b/drivers/media/usb/cx231xx/cx231xx.h @@ -624,6 +624,7 @@ struct cx231xx { /* I2C adapters: Master 1 & 2 (External) & Master 3 (Internal only) */ struct cx231xx_i2c i2c_bus[3]; + struct i2c_mux_core *muxc; struct i2c_adapter *i2c_mux_adap[2]; unsigned int xc_fw_load_done:1; @@ -760,8 +761,9 @@ int cx231xx_reset_analog_tuner(struct cx231xx *dev); void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port); int cx231xx_i2c_register(struct cx231xx_i2c *bus); int cx231xx_i2c_unregister(struct cx231xx_i2c *bus); +int cx231xx_i2c_mux_create(struct cx231xx *dev); int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no); -void cx231xx_i2c_mux_unregister(struct cx231xx *dev, int mux_no); +void cx231xx_i2c_mux_unregister(struct cx231xx *dev); struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port); /* Internal block control functions */ diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c index fa72642d41f3..eb7af8cb8aca 100644 --- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c +++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c @@ -1333,10 +1333,7 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter *adap) case TUNER_RTL2832_R828D: pdata.clk = dev->rtl2832_platform_data.clk; pdata.tuner = dev->tuner; - pdata.i2c_client = dev->i2c_client_demod; - pdata.bulk_read = dev->rtl2832_platform_data.bulk_read; - pdata.bulk_write = dev->rtl2832_platform_data.bulk_write; - pdata.update_bits = dev->rtl2832_platform_data.update_bits; + pdata.regmap = dev->rtl2832_platform_data.regmap; pdata.dvb_frontend = adap->fe[0]; pdata.dvb_usb_device = d; pdata.v4l2_subdev = subdev; diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 089d6943f68a..6cc17b7779a5 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -245,8 +245,7 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf, if (status == count) return count; - /* REVISIT: at HZ=100, this is sloooow */ - msleep(1); + usleep_range(1000, 1500); } while (time_before(read_time, timeout)); return -ETIMEDOUT; @@ -365,8 +364,7 @@ static ssize_t at24_eeprom_write(struct at24_data *at24, const char *buf, if (status == count) return count; - /* REVISIT: at HZ=100, this is sloooow */ - msleep(1); + usleep_range(1000, 1500); } while (time_before(write_time, timeout)); return -ETIMEDOUT; @@ -544,10 +542,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) } else { return -EPFNOSUPPORT; } - } - /* Use I2C operations unless we're stuck with SMBus extensions. */ - if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) { use_smbus_write = I2C_SMBUS_I2C_BLOCK_DATA; diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c index e986e6ee52e0..c1ebbfb79453 100644 --- a/drivers/of/unittest.c +++ b/drivers/of/unittest.c @@ -1692,13 +1692,7 @@ static struct i2c_driver unittest_i2c_dev_driver = { #if IS_BUILTIN(CONFIG_I2C_MUX) -struct unittest_i2c_mux_data { - int nchans; - struct i2c_adapter *adap[]; -}; - -static int unittest_i2c_mux_select_chan(struct i2c_adapter *adap, - void *client, u32 chan) +static int unittest_i2c_mux_select_chan(struct i2c_mux_core *muxc, u32 chan) { return 0; } @@ -1706,11 +1700,11 @@ static int unittest_i2c_mux_select_chan(struct i2c_adapter *adap, static int unittest_i2c_mux_probe(struct i2c_client *client, const struct i2c_device_id *id) { - int ret, i, nchans, size; + int ret, i, nchans; struct device *dev = &client->dev; struct i2c_adapter *adap = to_i2c_adapter(dev->parent); struct device_node *np = client->dev.of_node, *child; - struct unittest_i2c_mux_data *stm; + struct i2c_mux_core *muxc; u32 reg, max_reg; dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name); @@ -1734,25 +1728,20 @@ static int unittest_i2c_mux_probe(struct i2c_client *client, return -EINVAL; } - size = offsetof(struct unittest_i2c_mux_data, adap[nchans]); - stm = devm_kzalloc(dev, size, GFP_KERNEL); - if (!stm) { - dev_err(dev, "Out of memory\n"); + muxc = i2c_mux_alloc(adap, dev, nchans, 0, 0, + unittest_i2c_mux_select_chan, NULL); + if (!muxc) return -ENOMEM; - } - stm->nchans = nchans; for (i = 0; i < nchans; i++) { - stm->adap[i] = i2c_add_mux_adapter(adap, dev, client, - 0, i, 0, unittest_i2c_mux_select_chan, NULL); - if (!stm->adap[i]) { + ret = i2c_mux_add_adapter(muxc, 0, i, 0); + if (ret) { dev_err(dev, "Failed to register mux #%d\n", i); - for (i--; i >= 0; i--) - i2c_del_mux_adapter(stm->adap[i]); + i2c_mux_del_adapters(muxc); return -ENODEV; } } - i2c_set_clientdata(client, stm); + i2c_set_clientdata(client, muxc); return 0; }; @@ -1761,12 +1750,10 @@ static int unittest_i2c_mux_remove(struct i2c_client *client) { struct device *dev = &client->dev; struct device_node *np = client->dev.of_node; - struct unittest_i2c_mux_data *stm = i2c_get_clientdata(client); - int i; + struct i2c_mux_core *muxc = i2c_get_clientdata(client); dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name); - for (i = stm->nchans - 1; i >= 0; i--) - i2c_del_mux_adapter(stm->adap[i]); + i2c_mux_del_adapters(muxc); return 0; } diff --git a/include/linux/i2c-mux.h b/include/linux/i2c-mux.h index b5f9a007a3ab..d4c1d12f900d 100644 --- a/include/linux/i2c-mux.h +++ b/include/linux/i2c-mux.h @@ -27,22 +27,49 @@ #ifdef __KERNEL__ +#include <linux/bitops.h> + +struct i2c_mux_core { + struct i2c_adapter *parent; + struct device *dev; + bool mux_locked; + + void *priv; + + int (*select)(struct i2c_mux_core *, u32 chan_id); + int (*deselect)(struct i2c_mux_core *, u32 chan_id); + + int num_adapters; + int max_adapters; + struct i2c_adapter *adapter[0]; +}; + +struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, + struct device *dev, int max_adapters, + int sizeof_priv, u32 flags, + int (*select)(struct i2c_mux_core *, u32), + int (*deselect)(struct i2c_mux_core *, u32)); + +/* flags for i2c_mux_alloc */ +#define I2C_MUX_LOCKED BIT(0) + +static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) +{ + return muxc->priv; +} + +struct i2c_adapter *i2c_root_adapter(struct device *dev); + /* - * Called to create a i2c bus on a multiplexed bus segment. - * The mux_dev and chan_id parameters are passed to the select - * and deselect callback functions to perform hardware-specific - * mux control. + * Called to create an i2c bus on a multiplexed bus segment. + * The chan_id parameter is passed to the select and deselect + * callback functions to perform hardware-specific mux control. */ -struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, - struct device *mux_dev, - void *mux_priv, u32 force_nr, u32 chan_id, - unsigned int class, - int (*select) (struct i2c_adapter *, - void *mux_dev, u32 chan_id), - int (*deselect) (struct i2c_adapter *, - void *mux_dev, u32 chan_id)); - -void i2c_del_mux_adapter(struct i2c_adapter *adap); +int i2c_mux_add_adapter(struct i2c_mux_core *muxc, + u32 force_nr, u32 chan_id, + unsigned int class); + +void i2c_mux_del_adapters(struct i2c_mux_core *muxc); #endif /* __KERNEL__ */ diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 200cf13b00f6..96a25ae14494 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -524,6 +524,7 @@ struct i2c_adapter { /* data fields that are valid for all devices */ struct rt_mutex bus_lock; + struct rt_mutex mux_lock; int timeout; /* in jiffies */ int retries; @@ -538,6 +539,10 @@ struct i2c_adapter { struct i2c_bus_recovery_info *bus_recovery_info; const struct i2c_adapter_quirks *quirks; + + void (*lock_bus)(struct i2c_adapter *, unsigned int flags); + int (*trylock_bus)(struct i2c_adapter *, unsigned int flags); + void (*unlock_bus)(struct i2c_adapter *, unsigned int flags); }; #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) @@ -567,8 +572,44 @@ i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)); /* Adapter locking functions, exported for shared pin cases */ -void i2c_lock_adapter(struct i2c_adapter *); -void i2c_unlock_adapter(struct i2c_adapter *); +#define I2C_LOCK_ROOT_ADAPTER BIT(0) +#define I2C_LOCK_SEGMENT BIT(1) + +/** + * i2c_lock_bus - Get exclusive access to an I2C bus segment + * @adapter: Target I2C bus segment + * @flags: I2C_LOCK_ROOT_ADAPTER locks the root i2c adapter, I2C_LOCK_SEGMENT + * locks only this branch in the adapter tree + */ +static inline void +i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags) +{ + adapter->lock_bus(adapter, flags); +} + +/** + * i2c_unlock_bus - Release exclusive access to an I2C bus segment + * @adapter: Target I2C bus segment + * @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT + * unlocks only this branch in the adapter tree + */ +static inline void +i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags) +{ + adapter->unlock_bus(adapter, flags); +} + +static inline void +i2c_lock_adapter(struct i2c_adapter *adapter) +{ + i2c_lock_bus(adapter, I2C_LOCK_ROOT_ADAPTER); +} + +static inline void +i2c_unlock_adapter(struct i2c_adapter *adapter) +{ + i2c_unlock_bus(adapter, I2C_LOCK_ROOT_ADAPTER); +} /*flags for the client struct: */ #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ @@ -654,6 +695,11 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap) return adap->nr; } +static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg) +{ + return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0); +} + /** * module_i2c_driver() - Helper macro for registering a modular I2C driver * @__i2c_driver: i2c_driver struct diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h index b0a7dd61eb35..adcbef4bff61 100644 --- a/include/uapi/linux/i2c.h +++ b/include/uapi/linux/i2c.h @@ -68,14 +68,15 @@ struct i2c_msg { __u16 addr; /* slave address */ __u16 flags; -#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ #define I2C_M_RD 0x0001 /* read data, from slave to master */ -#define I2C_M_STOP 0x8000 /* if I2C_FUNC_PROTOCOL_MANGLING */ -#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_NOSTART */ -#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ -#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ -#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ + /* I2C_M_RD is guaranteed to be 0x0001! */ +#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ +#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ +#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ +#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ +#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_NOSTART */ +#define I2C_M_STOP 0x8000 /* if I2C_FUNC_PROTOCOL_MANGLING */ __u16 len; /* msg length */ __u8 *buf; /* pointer to msg data */ }; |