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-rw-r--r--drivers/i2c/busses/Kconfig25
-rw-r--r--drivers/i2c/busses/Makefile2
-rw-r--r--drivers/i2c/busses/i2c-at91.c3
-rw-r--r--drivers/i2c/busses/i2c-designware-core.c1
-rw-r--r--drivers/i2c/busses/i2c-exynos5.c2
-rw-r--r--drivers/i2c/busses/i2c-imx.c2
-rw-r--r--drivers/i2c/busses/i2c-isch.c7
-rw-r--r--drivers/i2c/busses/i2c-ismt.c37
-rw-r--r--drivers/i2c/busses/i2c-mv64xxx.c5
-rw-r--r--drivers/i2c/busses/i2c-nomadik.c64
-rw-r--r--drivers/i2c/busses/i2c-pnx.c64
-rw-r--r--drivers/i2c/busses/i2c-riic.c427
-rw-r--r--drivers/i2c/busses/i2c-robotfuzz-osif.c202
-rw-r--r--drivers/i2c/busses/i2c-s3c2410.c76
-rw-r--r--drivers/i2c/busses/i2c-stu300.c2
-rw-r--r--drivers/i2c/busses/i2c-tegra.c13
-rw-r--r--drivers/i2c/busses/i2c-tiny-usb.c1
-rw-r--r--drivers/i2c/busses/i2c-viperboard.c16
-rw-r--r--drivers/i2c/busses/i2c-xiic.c89
-rw-r--r--drivers/i2c/i2c-core.c11
-rw-r--r--drivers/i2c/muxes/i2c-mux-pca954x.c44
21 files changed, 909 insertions, 184 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 3b26129f6055..6bcdea5856af 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -412,7 +412,6 @@ config I2C_DESIGNWARE_CORE
config I2C_DESIGNWARE_PLATFORM
tristate "Synopsys DesignWare Platform"
- depends on HAVE_CLK
select I2C_DESIGNWARE_CORE
help
If you say yes to this option, support will be included for the
@@ -648,6 +647,16 @@ config I2C_PXA_SLAVE
is necessary for systems where the PXA may be a target on the
I2C bus.
+config I2C_RIIC
+ tristate "Renesas RIIC adapter"
+ depends on ARCH_SHMOBILE || COMPILE_TEST
+ help
+ If you say yes to this option, support will be included for the
+ Renesas RIIC I2C interface.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-riic.
+
config HAVE_S3C2410_I2C
bool
help
@@ -683,7 +692,7 @@ config I2C_SH7760
config I2C_SH_MOBILE
tristate "SuperH Mobile I2C Controller"
- depends on SUPERH || ARM || COMPILE_TEST
+ depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
help
If you say yes to this option, support will be included for the
built-in I2C interface on the Renesas SH-Mobile processor.
@@ -796,7 +805,7 @@ config I2C_XLR
config I2C_RCAR
tristate "Renesas R-Car I2C Controller"
- depends on ARM || COMPILE_TEST
+ depends on ARCH_SHMOBILE || COMPILE_TEST
help
If you say yes to this option, support will be included for the
R-Car I2C controller.
@@ -865,6 +874,16 @@ config I2C_PARPORT_LIGHT
This support is also available as a module. If so, the module
will be called i2c-parport-light.
+config I2C_ROBOTFUZZ_OSIF
+ tristate "RobotFuzz Open Source InterFace USB adapter"
+ depends on USB
+ help
+ If you say yes to this option, support will be included for the
+ RobotFuzz Open Source InterFace USB to I2C interface.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-osif.
+
config I2C_TAOS_EVM
tristate "TAOS evaluation module"
depends on TTY
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index c73eb0ea788e..a08931fe73e1 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o
+obj-$(CONFIG_I2C_RIIC) += i2c-riic.o
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
obj-$(CONFIG_I2C_S6000) += i2c-s6000.o
obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
@@ -83,6 +84,7 @@ obj-$(CONFIG_I2C_RCAR) += i2c-rcar.o
obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
+obj-$(CONFIG_I2C_ROBOTFUZZ_OSIF) += i2c-robotfuzz-osif.o
obj-$(CONFIG_I2C_TAOS_EVM) += i2c-taos-evm.o
obj-$(CONFIG_I2C_TINY_USB) += i2c-tiny-usb.o
obj-$(CONFIG_I2C_VIPERBOARD) += i2c-viperboard.o
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 8edba9de76df..843d01268ae9 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -589,6 +589,9 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
.compatible = "atmel,at91sam9260-i2c",
.data = &at91sam9260_config,
} , {
+ .compatible = "atmel,at91sam9261-i2c",
+ .data = &at91sam9261_config,
+ } , {
.compatible = "atmel,at91sam9g20-i2c",
.data = &at91sam9g20_config,
} , {
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index e89e3e2145e5..14c4b30d4ccc 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -26,7 +26,6 @@
*
*/
#include <linux/export.h>
-#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/i2c.h>
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index c1ef228095b5..044f85b01d06 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -571,7 +571,7 @@ static int exynos5_i2c_xfer(struct i2c_adapter *adap,
int i = 0, ret = 0, stop = 0;
if (i2c->suspended) {
- dev_err(i2c->dev, "HS-I2C is not initialzed.\n");
+ dev_err(i2c->dev, "HS-I2C is not initialized.\n");
return -EIO;
}
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index d0cfbb4cb964..db895fb22e65 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -607,7 +607,7 @@ static int i2c_imx_probe(struct platform_device *pdev)
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "can't get irq number\n");
- return -ENOENT;
+ return irq;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
diff --git a/drivers/i2c/busses/i2c-isch.c b/drivers/i2c/busses/i2c-isch.c
index 8c38aaa7417c..af213045ab7e 100644
--- a/drivers/i2c/busses/i2c-isch.c
+++ b/drivers/i2c/busses/i2c-isch.c
@@ -275,7 +275,8 @@ static int smbus_sch_probe(struct platform_device *dev)
if (!res)
return -EBUSY;
- if (!request_region(res->start, resource_size(res), dev->name)) {
+ if (!devm_request_region(&dev->dev, res->start, resource_size(res),
+ dev->name)) {
dev_err(&dev->dev, "SMBus region 0x%x already in use!\n",
sch_smba);
return -EBUSY;
@@ -294,7 +295,6 @@ static int smbus_sch_probe(struct platform_device *dev)
retval = i2c_add_adapter(&sch_adapter);
if (retval) {
dev_err(&dev->dev, "Couldn't register adapter!\n");
- release_region(res->start, resource_size(res));
sch_smba = 0;
}
@@ -303,11 +303,8 @@ static int smbus_sch_probe(struct platform_device *dev)
static int smbus_sch_remove(struct platform_device *pdev)
{
- struct resource *res;
if (sch_smba) {
i2c_del_adapter(&sch_adapter);
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- release_region(res->start, resource_size(res));
sch_smba = 0;
}
diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
index 0043ede234c2..bb132ea7d2b4 100644
--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -344,6 +344,7 @@ static int ismt_process_desc(const struct ismt_desc *desc,
data->word = dma_buffer[0] | (dma_buffer[1] << 8);
break;
case I2C_SMBUS_BLOCK_DATA:
+ case I2C_SMBUS_I2C_BLOCK_DATA:
memcpy(&data->block[1], dma_buffer, desc->rxbytes);
data->block[0] = desc->rxbytes;
break;
@@ -509,6 +510,41 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr,
}
break;
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ /* Make sure the length is valid */
+ if (data->block[0] < 1)
+ data->block[0] = 1;
+
+ if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
+ data->block[0] = I2C_SMBUS_BLOCK_MAX;
+
+ if (read_write == I2C_SMBUS_WRITE) {
+ /* i2c Block Write */
+ dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: WRITE\n");
+ dma_size = data->block[0] + 1;
+ dma_direction = DMA_TO_DEVICE;
+ desc->wr_len_cmd = dma_size;
+ desc->control |= ISMT_DESC_I2C;
+ priv->dma_buffer[0] = command;
+ memcpy(&priv->dma_buffer[1], &data->block[1], dma_size);
+ } else {
+ /* i2c Block Read */
+ dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: READ\n");
+ dma_size = data->block[0];
+ dma_direction = DMA_FROM_DEVICE;
+ desc->rd_len = dma_size;
+ desc->wr_len_cmd = command;
+ desc->control |= (ISMT_DESC_I2C | ISMT_DESC_CWRL);
+ /*
+ * Per the "Table 15-15. I2C Commands",
+ * in the External Design Specification (EDS),
+ * (Document Number: 508084, Revision: 2.0),
+ * the _rw bit must be 0
+ */
+ desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, 0);
+ }
+ break;
+
default:
dev_err(dev, "Unsupported transaction %d\n",
size);
@@ -582,6 +618,7 @@ static u32 ismt_func(struct i2c_adapter *adap)
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_PROC_CALL |
I2C_FUNC_SMBUS_BLOCK_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK |
I2C_FUNC_SMBUS_PEC;
}
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 8be7e42aa4de..b8c5187b9ee0 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -692,6 +692,7 @@ static const struct of_device_id mv64xxx_i2c_of_match_table[] = {
{ .compatible = "allwinner,sun4i-i2c", .data = &mv64xxx_i2c_regs_sun4i},
{ .compatible = "marvell,mv64xxx-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
{ .compatible = "marvell,mv78230-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
+ { .compatible = "marvell,mv78230-a0-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
{}
};
MODULE_DEVICE_TABLE(of, mv64xxx_i2c_of_match_table);
@@ -783,6 +784,10 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
drv_data->errata_delay = true;
}
+ if (of_device_is_compatible(np, "marvell,mv78230-a0-i2c")) {
+ drv_data->offload_enabled = false;
+ drv_data->errata_delay = true;
+ }
out:
return rc;
#endif
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 8bf9ac01301a..4443613514ee 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -22,7 +22,6 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
-#include <linux/platform_data/i2c-nomadik.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
@@ -104,6 +103,29 @@
/* maximum threshold value */
#define MAX_I2C_FIFO_THRESHOLD 15
+enum i2c_freq_mode {
+ I2C_FREQ_MODE_STANDARD, /* up to 100 Kb/s */
+ I2C_FREQ_MODE_FAST, /* up to 400 Kb/s */
+ I2C_FREQ_MODE_HIGH_SPEED, /* up to 3.4 Mb/s */
+ I2C_FREQ_MODE_FAST_PLUS, /* up to 1 Mb/s */
+};
+
+/**
+ * struct nmk_i2c_controller - client specific controller configuration
+ * @clk_freq: clock frequency for the operation mode
+ * @tft: Tx FIFO Threshold in bytes
+ * @rft: Rx FIFO Threshold in bytes
+ * @timeout Slave response timeout(ms)
+ * @sm: speed mode
+ */
+struct nmk_i2c_controller {
+ u32 clk_freq;
+ unsigned char tft;
+ unsigned char rft;
+ int timeout;
+ enum i2c_freq_mode sm;
+};
+
/**
* struct i2c_vendor_data - per-vendor variations
* @has_mtdws: variant has the MTDWS bit
@@ -340,6 +362,8 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
{
u32 brcr1, brcr2;
u32 i2c_clk, div;
+ u32 ns;
+ u16 slsu;
writel(0x0, dev->virtbase + I2C_CR);
writel(0x0, dev->virtbase + I2C_HSMCR);
@@ -347,18 +371,38 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
writel(0x0, dev->virtbase + I2C_RFTR);
writel(0x0, dev->virtbase + I2C_DMAR);
+ i2c_clk = clk_get_rate(dev->clk);
+
/*
* set the slsu:
*
* slsu defines the data setup time after SCL clock
- * stretching in terms of i2c clk cycles. The
- * needed setup time for the three modes are 250ns,
- * 100ns, 10ns respectively thus leading to the values
- * of 14, 6, 2 for a 48 MHz i2c clk.
+ * stretching in terms of i2c clk cycles + 1 (zero means
+ * "wait one cycle"), the needed setup time for the three
+ * modes are 250ns, 100ns, 10ns respectively.
+ *
+ * As the time for one cycle T in nanoseconds is
+ * T = (1/f) * 1000000000 =>
+ * slsu = cycles / (1000000000 / f) + 1
*/
- writel(dev->cfg.slsu << 16, dev->virtbase + I2C_SCR);
+ ns = DIV_ROUND_UP_ULL(1000000000ULL, i2c_clk);
+ switch (dev->cfg.sm) {
+ case I2C_FREQ_MODE_FAST:
+ case I2C_FREQ_MODE_FAST_PLUS:
+ slsu = DIV_ROUND_UP(100, ns); /* Fast */
+ break;
+ case I2C_FREQ_MODE_HIGH_SPEED:
+ slsu = DIV_ROUND_UP(10, ns); /* High */
+ break;
+ case I2C_FREQ_MODE_STANDARD:
+ default:
+ slsu = DIV_ROUND_UP(250, ns); /* Standard */
+ break;
+ }
+ slsu += 1;
- i2c_clk = clk_get_rate(dev->clk);
+ dev_dbg(&dev->adev->dev, "calculated SLSU = %04x\n", slsu);
+ writel(slsu << 16, dev->virtbase + I2C_SCR);
/*
* The spec says, in case of std. mode the divider is
@@ -915,11 +959,6 @@ static const struct i2c_algorithm nmk_i2c_algo = {
};
static struct nmk_i2c_controller u8500_i2c = {
- /*
- * Slave data setup time; 250ns, 100ns, and 10ns, which
- * is 14, 6 and 2 respectively for a 48Mhz i2c clock.
- */
- .slsu = 0xe,
.tft = 1, /* Tx FIFO threshold */
.rft = 8, /* Rx FIFO threshold */
.clk_freq = 400000, /* fast mode operation */
@@ -1027,7 +1066,6 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
/* fetch the controller configuration from machine */
dev->cfg.clk_freq = pdata->clk_freq;
- dev->cfg.slsu = pdata->slsu;
dev->cfg.tft = pdata->tft;
dev->cfg.rft = pdata->rft;
dev->cfg.sm = pdata->sm;
diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index c9a352f0a9a5..dc7ff829ad78 100644
--- a/drivers/i2c/busses/i2c-pnx.c
+++ b/drivers/i2c/busses/i2c-pnx.c
@@ -628,11 +628,9 @@ static int i2c_pnx_probe(struct platform_device *pdev)
struct resource *res;
u32 speed = I2C_PNX_SPEED_KHZ_DEFAULT * 1000;
- alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL);
- if (!alg_data) {
- ret = -ENOMEM;
- goto err_kzalloc;
- }
+ alg_data = devm_kzalloc(&pdev->dev, sizeof(*alg_data), GFP_KERNEL);
+ if (!alg_data)
+ return -ENOMEM;
platform_set_drvdata(pdev, alg_data);
@@ -657,11 +655,9 @@ static int i2c_pnx_probe(struct platform_device *pdev)
*/
}
#endif
- alg_data->clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(alg_data->clk)) {
- ret = PTR_ERR(alg_data->clk);
- goto out_drvdata;
- }
+ alg_data->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(alg_data->clk))
+ return PTR_ERR(alg_data->clk);
init_timer(&alg_data->mif.timer);
alg_data->mif.timer.function = i2c_pnx_timeout;
@@ -672,31 +668,13 @@ static int i2c_pnx_probe(struct platform_device *pdev)
/* Register I/O resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "Unable to get mem resource.\n");
- ret = -EBUSY;
- goto out_clkget;
- }
- if (!request_mem_region(res->start, I2C_PNX_REGION_SIZE,
- pdev->name)) {
- dev_err(&pdev->dev,
- "I/O region 0x%08x for I2C already in use.\n",
- res->start);
- ret = -ENOMEM;
- goto out_clkget;
- }
-
- alg_data->base = res->start;
- alg_data->ioaddr = ioremap(res->start, I2C_PNX_REGION_SIZE);
- if (!alg_data->ioaddr) {
- dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
- ret = -ENOMEM;
- goto out_release;
- }
+ alg_data->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(alg_data->ioaddr))
+ return PTR_ERR(alg_data->ioaddr);
ret = clk_enable(alg_data->clk);
if (ret)
- goto out_unmap;
+ return ret;
freq = clk_get_rate(alg_data->clk);
@@ -730,8 +708,8 @@ static int i2c_pnx_probe(struct platform_device *pdev)
ret = alg_data->irq;
goto out_clock;
}
- ret = request_irq(alg_data->irq, i2c_pnx_interrupt,
- 0, pdev->name, alg_data);
+ ret = devm_request_irq(&pdev->dev, alg_data->irq, i2c_pnx_interrupt,
+ 0, pdev->name, alg_data);
if (ret)
goto out_clock;
@@ -739,7 +717,7 @@ static int i2c_pnx_probe(struct platform_device *pdev)
ret = i2c_add_numbered_adapter(&alg_data->adapter);
if (ret < 0) {
dev_err(&pdev->dev, "I2C: Failed to add bus\n");
- goto out_irq;
+ goto out_clock;
}
dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
@@ -747,19 +725,8 @@ static int i2c_pnx_probe(struct platform_device *pdev)
return 0;
-out_irq:
- free_irq(alg_data->irq, alg_data);
out_clock:
clk_disable(alg_data->clk);
-out_unmap:
- iounmap(alg_data->ioaddr);
-out_release:
- release_mem_region(res->start, I2C_PNX_REGION_SIZE);
-out_clkget:
- clk_put(alg_data->clk);
-out_drvdata:
- kfree(alg_data);
-err_kzalloc:
return ret;
}
@@ -767,13 +734,8 @@ static int i2c_pnx_remove(struct platform_device *pdev)
{
struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev);
- free_irq(alg_data->irq, alg_data);
i2c_del_adapter(&alg_data->adapter);
clk_disable(alg_data->clk);
- iounmap(alg_data->ioaddr);
- release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE);
- clk_put(alg_data->clk);
- kfree(alg_data);
return 0;
}
diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
new file mode 100644
index 000000000000..9e1f8bacfb39
--- /dev/null
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -0,0 +1,427 @@
+/*
+ * Renesas RIIC driver
+ *
+ * Copyright (C) 2013 Wolfram Sang <wsa@sang-engineering.com>
+ * Copyright (C) 2013 Renesas Solutions Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+/*
+ * This i2c core has a lot of interrupts, namely 8. We use their chaining as
+ * some kind of state machine.
+ *
+ * 1) The main xfer routine kicks off a transmission by putting the start bit
+ * (or repeated start) on the bus and enabling the transmit interrupt (TIE)
+ * since we need to send the slave address + RW bit in every case.
+ *
+ * 2) TIE sends slave address + RW bit and selects how to continue.
+ *
+ * 3a) Write case: We keep utilizing TIE as long as we have data to send. If we
+ * are done, we switch over to the transmission done interrupt (TEIE) and mark
+ * the message as completed (includes sending STOP) there.
+ *
+ * 3b) Read case: We switch over to receive interrupt (RIE). One dummy read is
+ * needed to start clocking, then we keep receiving until we are done. Note
+ * that we use the RDRFS mode all the time, i.e. we ACK/NACK every byte by
+ * writing to the ACKBT bit. I tried using the RDRFS mode only at the end of a
+ * message to create the final NACK as sketched in the datasheet. This caused
+ * some subtle races (when byte n was processed and byte n+1 was already
+ * waiting), though, and I started with the safe approach.
+ *
+ * 4) If we got a NACK somewhere, we flag the error and stop the transmission
+ * via NAKIE.
+ *
+ * Also check the comments in the interrupt routines for some gory details.
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#define RIIC_ICCR1 0x00
+#define RIIC_ICCR2 0x04
+#define RIIC_ICMR1 0x08
+#define RIIC_ICMR3 0x10
+#define RIIC_ICSER 0x18
+#define RIIC_ICIER 0x1c
+#define RIIC_ICSR2 0x24
+#define RIIC_ICBRL 0x34
+#define RIIC_ICBRH 0x38
+#define RIIC_ICDRT 0x3c
+#define RIIC_ICDRR 0x40
+
+#define ICCR1_ICE 0x80
+#define ICCR1_IICRST 0x40
+#define ICCR1_SOWP 0x10
+
+#define ICCR2_BBSY 0x80
+#define ICCR2_SP 0x08
+#define ICCR2_RS 0x04
+#define ICCR2_ST 0x02
+
+#define ICMR1_CKS_MASK 0x70
+#define ICMR1_BCWP 0x08
+#define ICMR1_CKS(_x) ((((_x) << 4) & ICMR1_CKS_MASK) | ICMR1_BCWP)
+
+#define ICMR3_RDRFS 0x20
+#define ICMR3_ACKWP 0x10
+#define ICMR3_ACKBT 0x08
+
+#define ICIER_TIE 0x80
+#define ICIER_TEIE 0x40
+#define ICIER_RIE 0x20
+#define ICIER_NAKIE 0x10
+
+#define ICSR2_NACKF 0x10
+
+/* ICBRx (@ PCLK 33MHz) */
+#define ICBR_RESERVED 0xe0 /* Should be 1 on writes */
+#define ICBRL_SP100K (19 | ICBR_RESERVED)
+#define ICBRH_SP100K (16 | ICBR_RESERVED)
+#define ICBRL_SP400K (21 | ICBR_RESERVED)
+#define ICBRH_SP400K (9 | ICBR_RESERVED)
+
+#define RIIC_INIT_MSG -1
+
+struct riic_dev {
+ void __iomem *base;
+ u8 *buf;
+ struct i2c_msg *msg;
+ int bytes_left;
+ int err;
+ int is_last;
+ struct completion msg_done;
+ struct i2c_adapter adapter;
+ struct clk *clk;
+};
+
+struct riic_irq_desc {
+ int res_num;
+ irq_handler_t isr;
+ char *name;
+};
+
+static inline void riic_clear_set_bit(struct riic_dev *riic, u8 clear, u8 set, u8 reg)
+{
+ writeb((readb(riic->base + reg) & ~clear) | set, riic->base + reg);
+}
+
+static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
+{
+ struct riic_dev *riic = i2c_get_adapdata(adap);
+ unsigned long time_left;
+ int i, ret;
+ u8 start_bit;
+
+ ret = clk_prepare_enable(riic->clk);
+ if (ret)
+ return ret;
+
+ if (readb(riic->base + RIIC_ICCR2) & ICCR2_BBSY) {
+ riic->err = -EBUSY;
+ goto out;
+ }
+
+ reinit_completion(&riic->msg_done);
+ riic->err = 0;
+
+ writeb(0, riic->base + RIIC_ICSR2);
+
+ for (i = 0, start_bit = ICCR2_ST; i < num; i++) {
+ riic->bytes_left = RIIC_INIT_MSG;
+ riic->buf = msgs[i].buf;
+ riic->msg = &msgs[i];
+ riic->is_last = (i == num - 1);
+
+ writeb(ICIER_NAKIE | ICIER_TIE, riic->base + RIIC_ICIER);
+
+ writeb(start_bit, riic->base + RIIC_ICCR2);
+
+ time_left = wait_for_completion_timeout(&riic->msg_done, riic->adapter.timeout);
+ if (time_left == 0)
+ riic->err = -ETIMEDOUT;
+
+ if (riic->err)
+ break;
+
+ start_bit = ICCR2_RS;
+ }
+
+ out:
+ clk_disable_unprepare(riic->clk);
+
+ return riic->err ?: num;
+}
+
+static irqreturn_t riic_tdre_isr(int irq, void *data)
+{
+ struct riic_dev *riic = data;
+ u8 val;
+
+ if (!riic->bytes_left)
+ return IRQ_NONE;
+
+ if (riic->bytes_left == RIIC_INIT_MSG) {
+ val = !!(riic->msg->flags & I2C_M_RD);
+ if (val)
+ /* On read, switch over to receive interrupt */
+ riic_clear_set_bit(riic, ICIER_TIE, ICIER_RIE, RIIC_ICIER);
+ else
+ /* On write, initialize length */
+ riic->bytes_left = riic->msg->len;
+
+ val |= (riic->msg->addr << 1);
+ } else {
+ val = *riic->buf;
+ riic->buf++;
+ riic->bytes_left--;
+ }
+
+ /*
+ * Switch to transmission ended interrupt when done. Do check here
+ * after bytes_left was initialized to support SMBUS_QUICK (new msg has
+ * 0 length then)
+ */
+ if (riic->bytes_left == 0)
+ riic_clear_set_bit(riic, ICIER_TIE, ICIER_TEIE, RIIC_ICIER);
+
+ /*
+ * This acks the TIE interrupt. We get another TIE immediately if our
+ * value could be moved to the shadow shift register right away. So
+ * this must be after updates to ICIER (where we want to disable TIE)!
+ */
+ writeb(val, riic->base + RIIC_ICDRT);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t riic_tend_isr(int irq, void *data)
+{
+ struct riic_dev *riic = data;
+
+ if (readb(riic->base + RIIC_ICSR2) & ICSR2_NACKF) {
+ /* We got a NACKIE */
+ readb(riic->base + RIIC_ICDRR); /* dummy read */
+ riic->err = -ENXIO;
+ } else if (riic->bytes_left) {
+ return IRQ_NONE;
+ }
+
+ if (riic->is_last || riic->err)
+ writeb(ICCR2_SP, riic->base + RIIC_ICCR2);
+
+ writeb(0, riic->base + RIIC_ICIER);
+ complete(&riic->msg_done);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t riic_rdrf_isr(int irq, void *data)
+{
+ struct riic_dev *riic = data;
+
+ if (!riic->bytes_left)
+ return IRQ_NONE;
+
+ if (riic->bytes_left == RIIC_INIT_MSG) {
+ riic->bytes_left = riic->msg->len;
+ readb(riic->base + RIIC_ICDRR); /* dummy read */
+ return IRQ_HANDLED;
+ }
+
+ if (riic->bytes_left == 1) {
+ /* STOP must come before we set ACKBT! */
+ if (riic->is_last)
+ writeb(ICCR2_SP, riic->base + RIIC_ICCR2);
+
+ riic_clear_set_bit(riic, 0, ICMR3_ACKBT, RIIC_ICMR3);
+
+ writeb(0, riic->base + RIIC_ICIER);
+ complete(&riic->msg_done);
+ } else {
+ riic_clear_set_bit(riic, ICMR3_ACKBT, 0, RIIC_ICMR3);
+ }
+
+ /* Reading acks the RIE interrupt */
+ *riic->buf = readb(riic->base + RIIC_ICDRR);
+ riic->buf++;
+ riic->bytes_left--;
+
+ return IRQ_HANDLED;
+}
+
+static u32 riic_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm riic_algo = {
+ .master_xfer = riic_xfer,
+ .functionality = riic_func,
+};
+
+static int riic_init_hw(struct riic_dev *riic, u32 spd)
+{
+ int ret;
+ unsigned long rate;
+
+ ret = clk_prepare_enable(riic->clk);
+ if (ret)
+ return ret;
+
+ /*
+ * TODO: Implement formula to calculate the timing values depending on
+ * variable parent clock rate and arbitrary bus speed
+ */
+ rate = clk_get_rate(riic->clk);
+ if (rate != 33325000) {
+ dev_err(&riic->adapter.dev,
+ "invalid parent clk (%lu). Must be 33325000Hz\n", rate);
+ clk_disable_unprepare(riic->clk);
+ return -EINVAL;
+ }
+
+ /* Changing the order of accessing IICRST and ICE may break things! */
+ writeb(ICCR1_IICRST | ICCR1_SOWP, riic->base + RIIC_ICCR1);
+ riic_clear_set_bit(riic, 0, ICCR1_ICE, RIIC_ICCR1);
+
+ switch (spd) {
+ case 100000:
+ writeb(ICMR1_CKS(3), riic->base + RIIC_ICMR1);
+ writeb(ICBRH_SP100K, riic->base + RIIC_ICBRH);
+ writeb(ICBRL_SP100K, riic->base + RIIC_ICBRL);
+ break;
+ case 400000:
+ writeb(ICMR1_CKS(1), riic->base + RIIC_ICMR1);
+ writeb(ICBRH_SP400K, riic->base + RIIC_ICBRH);
+ writeb(ICBRL_SP400K, riic->base + RIIC_ICBRL);
+ break;
+ default:
+ dev_err(&riic->adapter.dev,
+ "unsupported bus speed (%dHz). Use 100000 or 400000\n", spd);
+ clk_disable_unprepare(riic->clk);
+ return -EINVAL;
+ }
+
+ writeb(0, riic->base + RIIC_ICSER);
+ writeb(ICMR3_ACKWP | ICMR3_RDRFS, riic->base + RIIC_ICMR3);
+
+ riic_clear_set_bit(riic, ICCR1_IICRST, 0, RIIC_ICCR1);
+
+ clk_disable_unprepare(riic->clk);
+
+ return 0;
+}
+
+static struct riic_irq_desc riic_irqs[] = {
+ { .res_num = 0, .isr = riic_tend_isr, .name = "riic-tend" },
+ { .res_num = 1, .isr = riic_rdrf_isr, .name = "riic-rdrf" },
+ { .res_num = 2, .isr = riic_tdre_isr, .name = "riic-tdre" },
+ { .res_num = 5, .isr = riic_tend_isr, .name = "riic-nack" },
+};
+
+static int riic_i2c_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct riic_dev *riic;
+ struct i2c_adapter *adap;
+ struct resource *res;
+ u32 bus_rate = 0;
+ int i, ret;
+
+ riic = devm_kzalloc(&pdev->dev, sizeof(*riic), GFP_KERNEL);
+ if (!riic)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ riic->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(riic->base))
+ return PTR_ERR(riic->base);
+
+ riic->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(riic->clk)) {
+ dev_err(&pdev->dev, "missing controller clock");
+ return PTR_ERR(riic->clk);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) {
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num);
+ if (!res)
+ return -ENODEV;
+
+ ret = devm_request_irq(&pdev->dev, res->start, riic_irqs[i].isr,
+ 0, riic_irqs[i].name, riic);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq %s\n", riic_irqs[i].name);
+ return ret;
+ }
+ }
+
+ adap = &riic->adapter;
+ i2c_set_adapdata(adap, riic);
+ strlcpy(adap->name, "Renesas RIIC adapter", sizeof(adap->name));
+ adap->owner = THIS_MODULE;
+ adap->algo = &riic_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->dev.of_node = pdev->dev.of_node;
+
+ init_completion(&riic->msg_done);
+
+ of_property_read_u32(np, "clock-frequency", &bus_rate);
+ ret = riic_init_hw(riic, bus_rate);
+ if (ret)
+ return ret;
+
+
+ ret = i2c_add_adapter(adap);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add adapter\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, riic);
+
+ dev_info(&pdev->dev, "registered with %dHz bus speed\n", bus_rate);
+ return 0;
+}
+
+static int riic_i2c_remove(struct platform_device *pdev)
+{
+ struct riic_dev *riic = platform_get_drvdata(pdev);
+
+ writeb(0, riic->base + RIIC_ICIER);
+ i2c_del_adapter(&riic->adapter);
+
+ return 0;
+}
+
+static struct of_device_id riic_i2c_dt_ids[] = {
+ { .compatible = "renesas,riic-rz" },
+ { /* Sentinel */ },
+};
+
+static struct platform_driver riic_i2c_driver = {
+ .probe = riic_i2c_probe,
+ .remove = riic_i2c_remove,
+ .driver = {
+ .name = "i2c-riic",
+ .owner = THIS_MODULE,
+ .of_match_table = riic_i2c_dt_ids,
+ },
+};
+
+module_platform_driver(riic_i2c_driver);
+
+MODULE_DESCRIPTION("Renesas RIIC adapter");
+MODULE_AUTHOR("Wolfram Sang <wsa@sang-engineering.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, riic_i2c_dt_ids);
diff --git a/drivers/i2c/busses/i2c-robotfuzz-osif.c b/drivers/i2c/busses/i2c-robotfuzz-osif.c
new file mode 100644
index 000000000000..ced9c6a308d1
--- /dev/null
+++ b/drivers/i2c/busses/i2c-robotfuzz-osif.c
@@ -0,0 +1,202 @@
+/*
+ * Driver for RobotFuzz OSIF
+ *
+ * Copyright (c) 2013 Andrew Lunn <andrew@lunn.ch>
+ * Copyright (c) 2007 Barry Carter <Barry.Carter@robotfuzz.com>
+ *
+ * Based on the i2c-tiny-usb by
+ *
+ * Copyright (C) 2006 Til Harbaum (Till@Harbaum.org)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#define OSIFI2C_READ 20
+#define OSIFI2C_WRITE 21
+#define OSIFI2C_STOP 22
+#define OSIFI2C_STATUS 23
+#define OSIFI2C_SET_BIT_RATE 24
+
+#define STATUS_ADDRESS_ACK 0
+#define STATUS_ADDRESS_NAK 2
+
+struct osif_priv {
+ struct usb_device *usb_dev;
+ struct usb_interface *interface;
+ struct i2c_adapter adapter;
+ unsigned char status;
+};
+
+static int osif_usb_read(struct i2c_adapter *adapter, int cmd,
+ int value, int index, void *data, int len)
+{
+ struct osif_priv *priv = adapter->algo_data;
+
+ return usb_control_msg(priv->usb_dev, usb_rcvctrlpipe(priv->usb_dev, 0),
+ cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE |
+ USB_DIR_IN, value, index, data, len, 2000);
+}
+
+static int osif_usb_write(struct i2c_adapter *adapter, int cmd,
+ int value, int index, void *data, int len)
+{
+
+ struct osif_priv *priv = adapter->algo_data;
+
+ return usb_control_msg(priv->usb_dev, usb_sndctrlpipe(priv->usb_dev, 0),
+ cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
+ value, index, data, len, 2000);
+}
+
+static int osif_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
+ int num)
+{
+ struct osif_priv *priv = adapter->algo_data;
+ struct i2c_msg *pmsg;
+ int ret = 0;
+ int i, cmd;
+
+ for (i = 0; ret >= 0 && i < num; i++) {
+ pmsg = &msgs[i];
+
+ if (pmsg->flags & I2C_M_RD) {
+ cmd = OSIFI2C_READ;
+
+ ret = osif_usb_read(adapter, cmd, pmsg->flags,
+ pmsg->addr, pmsg->buf,
+ pmsg->len);
+ if (ret != pmsg->len) {
+ dev_err(&adapter->dev, "failure reading data\n");
+ return -EREMOTEIO;
+ }
+ } else {
+ cmd = OSIFI2C_WRITE;
+
+ ret = osif_usb_write(adapter, cmd, pmsg->flags,
+ pmsg->addr, pmsg->buf, pmsg->len);
+ if (ret != pmsg->len) {
+ dev_err(&adapter->dev, "failure writing data\n");
+ return -EREMOTEIO;
+ }
+ }
+
+ ret = osif_usb_read(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
+ if (ret) {
+ dev_err(&adapter->dev, "failure sending STOP\n");
+ return -EREMOTEIO;
+ }
+
+ /* read status */
+ ret = osif_usb_read(adapter, OSIFI2C_STATUS, 0, 0,
+ &priv->status, 1);
+ if (ret != 1) {
+ dev_err(&adapter->dev, "failure reading status\n");
+ return -EREMOTEIO;
+ }
+
+ if (priv->status != STATUS_ADDRESS_ACK) {
+ dev_dbg(&adapter->dev, "status = %d\n", priv->status);
+ return -EREMOTEIO;
+ }
+ }
+
+ return i;
+}
+
+static u32 osif_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm osif_algorithm = {
+ .master_xfer = osif_xfer,
+ .functionality = osif_func,
+};
+
+#define USB_OSIF_VENDOR_ID 0x1964
+#define USB_OSIF_PRODUCT_ID 0x0001
+
+static struct usb_device_id osif_table[] = {
+ { USB_DEVICE(USB_OSIF_VENDOR_ID, USB_OSIF_PRODUCT_ID) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, osif_table);
+
+static int osif_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ int ret;
+ struct osif_priv *priv;
+ u16 version;
+
+ priv = devm_kzalloc(&interface->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->usb_dev = usb_get_dev(interface_to_usbdev(interface));
+ priv->interface = interface;
+
+ usb_set_intfdata(interface, priv);
+
+ priv->adapter.owner = THIS_MODULE;
+ priv->adapter.class = I2C_CLASS_HWMON;
+ priv->adapter.algo = &osif_algorithm;
+ priv->adapter.algo_data = priv;
+ snprintf(priv->adapter.name, sizeof(priv->adapter.name),
+ "OSIF at bus %03d device %03d",
+ priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
+
+ /*
+ * Set bus frequency. The frequency is:
+ * 120,000,000 / ( 16 + 2 * div * 4^prescale).
+ * Using dev = 52, prescale = 0 give 100KHz */
+ ret = osif_usb_read(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
+ NULL, 0);
+ if (ret) {
+ dev_err(&interface->dev, "failure sending bit rate");
+ usb_put_dev(priv->usb_dev);
+ return ret;
+ }
+
+ i2c_add_adapter(&(priv->adapter));
+
+ version = le16_to_cpu(priv->usb_dev->descriptor.bcdDevice);
+ dev_info(&interface->dev,
+ "version %x.%02x found at bus %03d address %03d",
+ version >> 8, version & 0xff,
+ priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
+
+ return 0;
+}
+
+static void osif_disconnect(struct usb_interface *interface)
+{
+ struct osif_priv *priv = usb_get_intfdata(interface);
+
+ i2c_del_adapter(&(priv->adapter));
+ usb_set_intfdata(interface, NULL);
+ usb_put_dev(priv->usb_dev);
+}
+
+static struct usb_driver osif_driver = {
+ .name = "RobotFuzz Open Source InterFace, OSIF",
+ .probe = osif_probe,
+ .disconnect = osif_disconnect,
+ .id_table = osif_table,
+};
+
+module_usb_driver(osif_driver);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
+MODULE_AUTHOR("Barry Carter <barry.carter@robotfuzz.com>");
+MODULE_DESCRIPTION("RobotFuzz OSIF driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index bf8fb94ebc5d..684d21e71e4a 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -86,6 +86,7 @@
#define QUIRK_S3C2440 (1 << 0)
#define QUIRK_HDMIPHY (1 << 1)
#define QUIRK_NO_GPIO (1 << 2)
+#define QUIRK_POLL (1 << 3)
/* Max time to wait for bus to become idle after a xfer (in us) */
#define S3C2410_IDLE_TIMEOUT 5000
@@ -101,7 +102,7 @@ enum s3c24xx_i2c_state {
struct s3c24xx_i2c {
wait_queue_head_t wait;
- unsigned int quirks;
+ kernel_ulong_t quirks;
unsigned int suspended:1;
struct i2c_msg *msg;
@@ -123,7 +124,7 @@ struct s3c24xx_i2c {
struct s3c2410_platform_i2c *pdata;
int gpios[2];
struct pinctrl *pctrl;
-#ifdef CONFIG_CPU_FREQ
+#if defined(CONFIG_ARM_S3C24XX_CPUFREQ)
struct notifier_block freq_transition;
#endif
};
@@ -142,6 +143,8 @@ static struct platform_device_id s3c24xx_driver_ids[] = {
};
MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
+static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat);
+
#ifdef CONFIG_OF
static const struct of_device_id s3c24xx_i2c_match[] = {
{ .compatible = "samsung,s3c2410-i2c", .data = (void *)0 },
@@ -150,6 +153,8 @@ static const struct of_device_id s3c24xx_i2c_match[] = {
.data = (void *)(QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO) },
{ .compatible = "samsung,exynos5440-i2c",
.data = (void *)(QUIRK_S3C2440 | QUIRK_NO_GPIO) },
+ { .compatible = "samsung,exynos5-sata-phy-i2c",
+ .data = (void *)(QUIRK_S3C2440 | QUIRK_POLL | QUIRK_NO_GPIO) },
{},
};
MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
@@ -160,12 +165,12 @@ MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
* Get controller type either from device tree or platform device variant.
*/
-static inline unsigned int s3c24xx_get_device_quirks(struct platform_device *pdev)
+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 (unsigned int)match->data;
+ return (kernel_ulong_t)match->data;
}
return platform_get_device_id(pdev)->driver_data;
@@ -188,7 +193,8 @@ static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret)
if (ret)
i2c->msg_idx = ret;
- wake_up(&i2c->wait);
+ if (!(i2c->quirks & QUIRK_POLL))
+ wake_up(&i2c->wait);
}
static inline void s3c24xx_i2c_disable_ack(struct s3c24xx_i2c *i2c)
@@ -225,6 +231,22 @@ static inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c)
writel(tmp | S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
}
+static bool is_ack(struct s3c24xx_i2c *i2c)
+{
+ int tries;
+
+ for (tries = 50; tries; --tries) {
+ if (readl(i2c->regs + S3C2410_IICCON)
+ & S3C2410_IICCON_IRQPEND) {
+ if (!(readl(i2c->regs + S3C2410_IICSTAT)
+ & S3C2410_IICSTAT_LASTBIT))
+ return true;
+ }
+ usleep_range(1000, 2000);
+ }
+ dev_err(i2c->dev, "ack was not recieved\n");
+ return false;
+}
/* s3c24xx_i2c_message_start
*
@@ -269,6 +291,16 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
stat |= S3C2410_IICSTAT_START;
writel(stat, i2c->regs + S3C2410_IICSTAT);
+
+ if (i2c->quirks & QUIRK_POLL) {
+ while ((i2c->msg_num != 0) && is_ack(i2c)) {
+ i2c_s3c_irq_nextbyte(i2c, stat);
+ stat = readl(i2c->regs + S3C2410_IICSTAT);
+
+ if (stat & S3C2410_IICSTAT_ARBITR)
+ dev_err(i2c->dev, "deal with arbitration loss\n");
+ }
+ }
}
static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret)
@@ -676,6 +708,15 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c,
s3c24xx_i2c_enable_irq(i2c);
s3c24xx_i2c_message_start(i2c, msgs);
+ if (i2c->quirks & QUIRK_POLL) {
+ ret = i2c->msg_idx;
+
+ if (ret != num)
+ dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret);
+
+ goto out;
+ }
+
timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
ret = i2c->msg_idx;
@@ -821,6 +862,9 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
if (div1 == 512)
iiccon |= S3C2410_IICCON_TXDIV_512;
+ if (i2c->quirks & QUIRK_POLL)
+ iiccon |= S3C2410_IICCON_SCALE(2);
+
writel(iiccon, i2c->regs + S3C2410_IICCON);
if (i2c->quirks & QUIRK_S3C2440) {
@@ -843,7 +887,7 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
return 0;
}
-#ifdef CONFIG_CPU_FREQ
+#if defined(CONFIG_ARM_S3C24XX_CPUFREQ)
#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition)
@@ -1118,18 +1162,20 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
* ensure no current IRQs pending
*/
- i2c->irq = ret = platform_get_irq(pdev, 0);
- if (ret <= 0) {
- dev_err(&pdev->dev, "cannot find IRQ\n");
- return ret;
- }
+ if (!(i2c->quirks & QUIRK_POLL)) {
+ i2c->irq = ret = platform_get_irq(pdev, 0);
+ if (ret <= 0) {
+ dev_err(&pdev->dev, "cannot find IRQ\n");
+ return ret;
+ }
ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, 0,
- dev_name(&pdev->dev), i2c);
+ dev_name(&pdev->dev), i2c);
- if (ret != 0) {
- dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
- return ret;
+ if (ret != 0) {
+ dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
+ return ret;
+ }
}
ret = s3c24xx_i2c_register_cpufreq(i2c);
diff --git a/drivers/i2c/busses/i2c-stu300.c b/drivers/i2c/busses/i2c-stu300.c
index 04a17b9b38bb..5b80ef310841 100644
--- a/drivers/i2c/busses/i2c-stu300.c
+++ b/drivers/i2c/busses/i2c-stu300.c
@@ -801,7 +801,7 @@ static int stu300_xfer_msg(struct i2c_adapter *adap,
/* Check that the bus is free, or wait until some timeout occurs */
ret = stu300_wait_while_busy(dev);
if (ret != 0) {
- dev_err(&dev->pdev->dev, "timout waiting for transfer "
+ dev_err(&dev->pdev->dev, "timeout waiting for transfer "
"to commence.\n");
goto exit_disable;
}
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index e661edee4d0c..9704537aee3c 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -27,7 +27,7 @@
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/module.h>
-#include <linux/clk/tegra.h>
+#include <linux/reset.h>
#include <asm/unaligned.h>
@@ -160,6 +160,7 @@ struct tegra_i2c_dev {
struct i2c_adapter adapter;
struct clk *div_clk;
struct clk *fast_clk;
+ struct reset_control *rst;
void __iomem *base;
int cont_id;
int irq;
@@ -415,9 +416,9 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
return err;
}
- tegra_periph_reset_assert(i2c_dev->div_clk);
+ reset_control_assert(i2c_dev->rst);
udelay(2);
- tegra_periph_reset_deassert(i2c_dev->div_clk);
+ reset_control_deassert(i2c_dev->rst);
if (i2c_dev->is_dvc)
tegra_dvc_init(i2c_dev);
@@ -743,6 +744,12 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->cont_id = pdev->id;
i2c_dev->dev = &pdev->dev;
+ i2c_dev->rst = devm_reset_control_get(&pdev->dev, "i2c");
+ if (IS_ERR(i2c_dev->rst)) {
+ dev_err(&pdev->dev, "missing controller reset");
+ 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)
diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c
index e7d3b755af3b..0ed77eeff31e 100644
--- a/drivers/i2c/busses/i2c-tiny-usb.c
+++ b/drivers/i2c/busses/i2c-tiny-usb.c
@@ -162,7 +162,6 @@ static const struct i2c_algorithm usb_algorithm = {
static const struct usb_device_id i2c_tiny_usb_table[] = {
{ USB_DEVICE(0x0403, 0xc631) }, /* FTDI */
{ USB_DEVICE(0x1c40, 0x0534) }, /* EZPrototypes */
- { USB_DEVICE(0x1964, 0x0001) }, /* Robofuzz OSIF */
{ } /* Terminating entry */
};
diff --git a/drivers/i2c/busses/i2c-viperboard.c b/drivers/i2c/busses/i2c-viperboard.c
index c68450cd8d5f..7533fa34d737 100644
--- a/drivers/i2c/busses/i2c-viperboard.c
+++ b/drivers/i2c/busses/i2c-viperboard.c
@@ -118,8 +118,7 @@ static int vprbrd_i2c_addr(struct usb_device *usb_dev,
static int vprbrd_i2c_read(struct vprbrd *vb, struct i2c_msg *msg)
{
int ret;
- u16 remain_len, bytes_xfer, len1, len2,
- start = 0x0000;
+ u16 remain_len, len1, len2, start = 0x0000;
struct vprbrd_i2c_read_msg *rmsg =
(struct vprbrd_i2c_read_msg *)vb->buf;
@@ -166,7 +165,6 @@ static int vprbrd_i2c_read(struct vprbrd *vb, struct i2c_msg *msg)
rmsg->header.len3 = remain_len - 512;
rmsg->header.len4 = 0x00;
rmsg->header.len5 = 0x00;
- bytes_xfer = remain_len;
remain_len = 0;
} else if (remain_len <= 1022) {
len1 = 512;
@@ -367,7 +365,7 @@ static int vprbrd_i2c_probe(struct platform_device *pdev)
int ret;
int pipe;
- vb_i2c = kzalloc(sizeof(*vb_i2c), GFP_KERNEL);
+ vb_i2c = devm_kzalloc(&pdev->dev, sizeof(*vb_i2c), GFP_KERNEL);
if (vb_i2c == NULL)
return -ENOMEM;
@@ -394,14 +392,12 @@ static int vprbrd_i2c_probe(struct platform_device *pdev)
if (ret != 1) {
dev_err(&pdev->dev,
"failure setting i2c_bus_freq to %d\n", i2c_bus_freq);
- ret = -EIO;
- goto error;
+ return -EIO;
}
} else {
dev_err(&pdev->dev,
"invalid i2c_bus_freq setting:%d\n", i2c_bus_freq);
- ret = -EIO;
- goto error;
+ return -EIO;
}
vb_i2c->i2c.dev.parent = &pdev->dev;
@@ -412,10 +408,6 @@ static int vprbrd_i2c_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, vb_i2c);
return 0;
-
-error:
- kfree(vb_i2c);
- return ret;
}
static int vprbrd_i2c_remove(struct platform_device *pdev)
diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index fc2716afdfd9..6f9918f37b91 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -32,6 +32,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
@@ -69,7 +70,7 @@ struct xiic_i2c {
struct i2c_adapter adap;
struct i2c_msg *tx_msg;
spinlock_t lock;
- unsigned int tx_pos;
+ unsigned int tx_pos;
unsigned int nmsgs;
enum xilinx_i2c_state state;
struct i2c_msg *rx_msg;
@@ -272,8 +273,8 @@ static void xiic_read_rx(struct xiic_i2c *i2c)
bytes_in_fifo = xiic_getreg8(i2c, XIIC_RFO_REG_OFFSET) + 1;
- dev_dbg(i2c->adap.dev.parent, "%s entry, bytes in fifo: %d, msg: %d"
- ", SR: 0x%x, CR: 0x%x\n",
+ dev_dbg(i2c->adap.dev.parent,
+ "%s entry, bytes in fifo: %d, msg: %d, SR: 0x%x, CR: 0x%x\n",
__func__, bytes_in_fifo, xiic_rx_space(i2c),
xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
@@ -340,9 +341,10 @@ static void xiic_process(struct xiic_i2c *i2c)
ier = xiic_getreg32(i2c, XIIC_IIER_OFFSET);
pend = isr & ier;
- dev_dbg(i2c->adap.dev.parent, "%s entry, IER: 0x%x, ISR: 0x%x, "
- "pend: 0x%x, SR: 0x%x, msg: %p, nmsgs: %d\n",
- __func__, ier, isr, pend, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
+ dev_dbg(i2c->adap.dev.parent, "%s: IER: 0x%x, ISR: 0x%x, pend: 0x%x\n",
+ __func__, ier, isr, pend);
+ dev_dbg(i2c->adap.dev.parent, "%s: SR: 0x%x, msg: %p, nmsgs: %d\n",
+ __func__, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
i2c->tx_msg, i2c->nmsgs);
/* Do not processes a devices interrupts if the device has no
@@ -542,9 +544,10 @@ static void xiic_start_send(struct xiic_i2c *i2c)
xiic_irq_clr(i2c, XIIC_INTR_TX_ERROR_MASK);
- dev_dbg(i2c->adap.dev.parent, "%s entry, msg: %p, len: %d, "
- "ISR: 0x%x, CR: 0x%x\n",
- __func__, msg, msg->len, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
+ dev_dbg(i2c->adap.dev.parent, "%s entry, msg: %p, len: %d",
+ __func__, msg, msg->len);
+ dev_dbg(i2c->adap.dev.parent, "%s entry, ISR: 0x%x, CR: 0x%x\n",
+ __func__, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
if (!(msg->flags & I2C_M_NOSTART)) {
@@ -695,33 +698,21 @@ static int xiic_i2c_probe(struct platform_device *pdev)
int ret, irq;
u8 i;
+ i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+ if (!i2c)
+ return -ENOMEM;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- goto resource_missing;
+ i2c->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c->base))
+ return PTR_ERR(i2c->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
- goto resource_missing;
+ return irq;
pdata = dev_get_platdata(&pdev->dev);
- i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
- if (!i2c)
- return -ENOMEM;
-
- if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
- dev_err(&pdev->dev, "Memory region busy\n");
- ret = -EBUSY;
- goto request_mem_failed;
- }
-
- i2c->base = ioremap(res->start, resource_size(res));
- if (!i2c->base) {
- dev_err(&pdev->dev, "Unable to map registers\n");
- ret = -EIO;
- goto map_failed;
- }
-
/* hook up driver to tree */
platform_set_drvdata(pdev, i2c);
i2c->adap = xiic_adapter;
@@ -729,21 +720,23 @@ static int xiic_i2c_probe(struct platform_device *pdev)
i2c->adap.dev.parent = &pdev->dev;
i2c->adap.dev.of_node = pdev->dev.of_node;
- xiic_reinit(i2c);
-
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
- ret = request_irq(irq, xiic_isr, 0, pdev->name, i2c);
- if (ret) {
+
+ ret = devm_request_irq(&pdev->dev, irq, xiic_isr, 0, pdev->name, i2c);
+ if (ret < 0) {
dev_err(&pdev->dev, "Cannot claim IRQ\n");
- goto request_irq_failed;
+ return ret;
}
+ xiic_reinit(i2c);
+
/* add i2c adapter to i2c tree */
ret = i2c_add_adapter(&i2c->adap);
if (ret) {
dev_err(&pdev->dev, "Failed to add adapter\n");
- goto add_adapter_failed;
+ xiic_deinit(i2c);
+ return ret;
}
if (pdata) {
@@ -753,43 +746,17 @@ static int xiic_i2c_probe(struct platform_device *pdev)
}
return 0;
-
-add_adapter_failed:
- free_irq(irq, i2c);
-request_irq_failed:
- xiic_deinit(i2c);
- iounmap(i2c->base);
-map_failed:
- release_mem_region(res->start, resource_size(res));
-request_mem_failed:
- kfree(i2c);
-
- return ret;
-resource_missing:
- dev_err(&pdev->dev, "IRQ or Memory resource is missing\n");
- return -ENOENT;
}
static int xiic_i2c_remove(struct platform_device *pdev)
{
struct xiic_i2c *i2c = platform_get_drvdata(pdev);
- struct resource *res;
/* remove adapter & data */
i2c_del_adapter(&i2c->adap);
xiic_deinit(i2c);
- free_irq(platform_get_irq(pdev, 0), i2c);
-
- iounmap(i2c->base);
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res)
- release_mem_region(res->start, resource_size(res));
-
- kfree(i2c);
-
return 0;
}
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d74c0b34248e..c4c5588ec0fb 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -104,6 +104,11 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct i2c_client *client = to_i2c_client(dev);
+ int rc;
+
+ rc = acpi_device_uevent_modalias(dev, env);
+ if (rc != -ENODEV)
+ return rc;
if (add_uevent_var(env, "MODALIAS=%s%s",
I2C_MODULE_PREFIX, client->name))
@@ -409,6 +414,12 @@ static ssize_t
show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
+ int len;
+
+ len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
+ if (len != -ENODEV)
+ return len;
+
return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name);
}
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index bad5b84a5985..e835304e7b5a 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -35,14 +35,15 @@
* warranty of any kind, whether express or implied.
*/
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
#include <linux/device.h>
+#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
-
#include <linux/i2c/pca954x.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
#define PCA954X_MAX_NCHANS 8
@@ -186,28 +187,43 @@ static int pca954x_probe(struct i2c_client *client,
{
struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct device_node *np = client->dev.of_node;
int num, force, class;
struct pca954x *data;
- int ret = -ENODEV;
+ int ret;
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))
- goto err;
+ return -ENODEV;
- data = kzalloc(sizeof(struct pca954x), GFP_KERNEL);
- if (!data) {
- ret = -ENOMEM;
- goto err;
- }
+ data = devm_kzalloc(&client->dev, sizeof(struct pca954x), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
i2c_set_clientdata(client, data);
+ if (IS_ENABLED(CONFIG_OF) && np) {
+ enum of_gpio_flags flags;
+ int gpio;
+
+ /* Get the mux out of reset if a reset GPIO is specified. */
+ gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
+ if (gpio_is_valid(gpio)) {
+ ret = devm_gpio_request_one(&client->dev, gpio,
+ flags & OF_GPIO_ACTIVE_LOW ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ "pca954x reset");
+ if (ret < 0)
+ return ret;
+ }
+ }
+
/* Write the mux register at addr to verify
* that the mux is in fact present. This also
* initializes the mux to disconnected state.
*/
if (i2c_smbus_write_byte(client, 0) < 0) {
dev_warn(&client->dev, "probe failed\n");
- goto exit_free;
+ return -ENODEV;
}
data->type = id->driver_data;
@@ -252,9 +268,6 @@ static int pca954x_probe(struct i2c_client *client,
virt_reg_failed:
for (num--; num >= 0; num--)
i2c_del_mux_adapter(data->virt_adaps[num]);
-exit_free:
- kfree(data);
-err:
return ret;
}
@@ -270,7 +283,6 @@ static int pca954x_remove(struct i2c_client *client)
data->virt_adaps[i] = NULL;
}
- kfree(data);
return 0;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-16 17:17:55 +0300