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2023-01-19tty: serial: qcom-geni-serial: drop the return value from handle_rxBartosz Golaszewski1-8/+6
The return value of the handle_rx() callback is never checked. Drop it. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-12-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: refactor qcom_geni_serial_send_chunk_fifo()Bartosz Golaszewski1-18/+10
Shuffle the code a bit, drop unneeded variables, make types of others more consistent and use uart_xmit_advance() instead of handling tail->xmit manually. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-11-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: split out the FIFO tx codeBartosz Golaszewski1-27/+33
qcom_geni_serial_handle_tx() is pretty big, let's move the code that handles the actual writing of data to a separate function which makes sense in preparation for introducing a dma variant of handle_tx(). Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-10-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: remove unneeded tabsBartosz Golaszewski1-12/+12
Remove redundant indentation in struct member assignment. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-9-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: refactor qcom_geni_serial_isr()Bartosz Golaszewski1-6/+4
Simplify the conditions in qcom_geni_serial_isr() and fix indentation. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221229155030.418800-8-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: remove stray newlinesBartosz Golaszewski1-2/+0
Remove stray newlines around #ifdefs for consistency with the rest of the driver code. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-7-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: improve the to_dev_port() macroBartosz Golaszewski1-17/+19
The member we want to resolve in struct qcom_geni_serial_port is called uport so we don't need an additional redundant parameter in this macro. While at it: turn the macro into a static inline function. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-6-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: align #define valuesBartosz Golaszewski1-31/+31
Keep the #define symbols aligned for better readability. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-5-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: remove unused symbolsBartosz Golaszewski1-15/+0
Drop all unused symbols from the driver. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-4-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: drop unneeded forward definitionsBartosz Golaszewski1-42/+37
If we shuffle the code a bit, we can drop all forward definitions of various static functions. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-3-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: qcom-geni-serial: stop operations in progress at shutdownBartosz Golaszewski1-0/+2
We don't stop transmissions in progress at shutdown. This is fine with FIFO SE mode but with DMA (support for which we'll introduce later) it causes trouble so fix it now. Fixes: e83766334f96 ("tty: serial: qcom_geni_serial: No need to stop tx/rx on UART shutdown") Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Link: https://lore.kernel.org/r/20221229155030.418800-2-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: cache row count in con_scroll()Jiri Slaby (SUSE)1-3/+4
It's used on few places, so make the code easier to follow by caching the subtraction result. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-11-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: saner names for more scroll variablesJiri Slaby (SUSE)1-18/+22
Rename more variables (t, b, s, d) -> (top, bottom, src, dst) to make them more obvious. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-10-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: separate array juggling to juggle_array()Jiri Slaby (SUSE)1-24/+28
The algorithm used for scrolling is the array juggling. It has complexity O(N) and space complexity O(1). I.e. quite fast w/o requirements for temporary storage. Move the algorithm to a separate function so it is obvious what it is. It is almost generic (except the array type), so if anyone else wants array rotation, feel free to make it generic and move it to include/. And rename all the variables from i, j, k, sz, d, and so on to something saner. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20230112080136.4929-9-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: simplify some unicode conditionsJiri Slaby (SUSE)1-49/+36
After previous patches, we can simply test vc->vc_uni_lines, so do so in many unicode functions. This makes the code more compact. And even use if (!) return; in vc_uniscr_scroll(), so that the whole code is indented on the left. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-8-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: replace BUG_ON() by WARN_ON_ONCE()Jiri Slaby (SUSE)1-1/+2
No need to panic in vc_uniscr_copy_line(), just warn. This should never happen though, as vc_uniscr_check() is supposed to be called before vc_uniscr_copy_line(). And the former checks vc->vc_uni_lines already. In any case, use _ONCE as vc_uniscr_copy_line() is called repeatedly for each line. So don't flood the logs, just in case. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-7-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: remove struct uni_screenJiri Slaby (SUSE)1-59/+58
It contains only lines with pointers to characters (u32s). So use simple clear 'u32 **lines' all over the code. This avoids zero-length arrays. It also makes the allocation less error-prone (size of the struct wasn't taken into account at all). Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-6-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: remove char32_t typedefJiri Slaby (SUSE)1-14/+12
It boils down to uint32_t, so use u32 directly, instead. This makes the code more obvious. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-5-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: use sizeof(*variable) where possibleJiri Slaby (SUSE)1-5/+5
Instead of sizeof(type), use sizeof(*variable) which is preferred. We are going to remove the unicode's char32_t typedef, so this makes the switch easier. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20230112080136.4929-4-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: remove reference to undefined NO_VC_UNI_SCREENJiri Slaby (SUSE)1-3/+0
NO_VC_UNI_SCREEN is defined nowhere. Remove the last reference to it. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-3-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: drop get_vc_uniscr()Jiri Slaby (SUSE)1-17/+10
Its definition depends on the NO_VC_UNI_SCREEN macro. But that is never defined, so remove all this completely. I.e. expand the macro to vc->vc_uni_screen everywhere. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-2-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: vt: remove vc_uniscr_debug_check()Jiri Slaby (SUSE)1-40/+0
VC_UNI_SCREEN_DEBUG is always defined as 0, so this code is never executed. Drop it along with VC_UNI_SCREEN_DEBUG. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230112080136.4929-1-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: fsl_lpuart: increase maximum uart_nr to eightNate Drude1-1/+1
Some SoCs like the i.MX93 have aliases for up to eight UARTs, see: https://github.com/torvalds/linux/blob/v6.1/arch/arm64/boot/dts/freescale/imx93.dtsi#L31-L38 Increase UART_NR from 6 to 8 to support lpuart7 and lpuart8 and avoid initialization failures like the following: [ 0.837146] fsl-lpuart 42690000.serial: serial6 out of range [ 0.842814] fsl-lpuart: probe of 42690000.serial failed with error -22 Signed-off-by: Nate Drude <nate.d@variscite.com> Reviewed-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221222145634.2217793-1-nate.d@variscite.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: imx: disable the break condition when shutdown the uart portSherry Sun1-1/+2
The comment in imx_uart_shutdown() says to disable the break condition, but it doesn't actually do that, here fix this by disabling UCR1_SNDBRK when closing the uart port like other uart drivers do. Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221214031137.28815-4-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: fsl_lpuart: disable the break condition when shutdown the uart portSherry Sun1-2/+2
Need to disable the break condition for lpuart driver when closing the uart port like other uart drivers do. Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221214031137.28815-3-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: fsl_lpuart: disable the CTS when send break signalSherry Sun1-2/+22
LPUART IP has a bug that it treats the CTS as higher priority than the break signal, which cause the break signal sending through UARTCTRL_SBK may impacted by the CTS input if the HW flow control is enabled. Add this workaround patch to fix the IP bug, we can disable CTS before asserting SBK to avoid any interference from CTS, and re-enable it when break off. Such as for the bluetooth chip power save feature, host can let the BT chip get into sleep state by sending a UART break signal, and wake it up by turning off the UART break. If the BT chip enters the sleep mode successfully, it will pull up the CTS line, if the BT chip is woken up, it will pull down the CTS line. If without this workaround patch, the UART TX pin cannot send the break signal successfully as it affected by the BT CTS pin. After adding this patch, the BT power save feature can work well. Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221214031137.28815-2-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32_shutdown()Sherry Sun1-0/+4
The LPUART Status Register needs to be cleared when closing the uart port to get a clean environment when reopening the uart. Fixes: 380c966c093e ("tty: serial: fsl_lpuart: add 32-bit register interface support") Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221125101953.18753-4-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown()Sherry Sun1-0/+5
UARTBAUD_RDMAE and UARTBAUD_TDMAE are enabled in lpuart32_startup(), but lpuart32_shutdown() not disable them, only free the dma ring buffer and release the dma channels, so here disable the Rx/Tx DMA first in lpuart32_shutdown(). Fixes: 42b68768e51b ("serial: fsl_lpuart: DMA support for 32-bit variant") Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: serial: fsl_lpuart: only enable Idle Line Interrupt for non-dma caseSherry Sun1-5/+8
For the lpuart driver, the Idle Line Interrupt Enable now is only needed for the CPU mode, so enable the UARTCTRL_ILIE at the correct place, and clear it when shutdown. Also need to configure the suitable UARTCTRL_IDLECFG, now the value is 0x7, represent 128 idle characters will trigger the Idle Line Interrupt. Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20221125101953.18753-2-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty/vt: prevent registration of console with invalid numberSven Schnelle1-0/+6
If a user specifies an invalid console like 'console=tty3000', the vt driver should prevent setting up a vt entry for that. Suggested-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Link: https://lore.kernel.org/r/20221209112737.3222509-3-svens@linux.ibm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19tty: fix out-of-bounds access in tty_driver_lookup_tty()Sven Schnelle1-3/+5
When specifying an invalid console= device like console=tty3270, tty_driver_lookup_tty() returns the tty struct without checking whether index is a valid number. To reproduce: qemu-system-x86_64 -enable-kvm -nographic -serial mon:stdio \ -kernel ../linux-build-x86/arch/x86/boot/bzImage \ -append "console=ttyS0 console=tty3270" This crashes with: [ 0.770599] BUG: kernel NULL pointer dereference, address: 00000000000000ef [ 0.771265] #PF: supervisor read access in kernel mode [ 0.771773] #PF: error_code(0x0000) - not-present page [ 0.772609] Oops: 0000 [#1] PREEMPT SMP PTI [ 0.774878] RIP: 0010:tty_open+0x268/0x6f0 [ 0.784013] chrdev_open+0xbd/0x230 [ 0.784444] ? cdev_device_add+0x80/0x80 [ 0.784920] do_dentry_open+0x1e0/0x410 [ 0.785389] path_openat+0xca9/0x1050 [ 0.785813] do_filp_open+0xaa/0x150 [ 0.786240] file_open_name+0x133/0x1b0 [ 0.786746] filp_open+0x27/0x50 [ 0.787244] console_on_rootfs+0x14/0x4d [ 0.787800] kernel_init_freeable+0x1e4/0x20d [ 0.788383] ? rest_init+0xc0/0xc0 [ 0.788881] kernel_init+0x11/0x120 [ 0.789356] ret_from_fork+0x22/0x30 Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221209112737.3222509-2-svens@linux.ibm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: 8250_early: Convert literals to use definesIlpo Järvinen1-2/+2
Use existing defines for the serial register values in 8250_early. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221125130509.8482-7-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: 8250: Define IIR 64 byte bit & cleanup related codeIlpo Järvinen1-5/+9
16750 indicates 64 bytes FIFO with a IIR bit. Add define for it and make related code more obvious. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221125130509.8482-6-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: 8250: Add IIR FIFOs enabled field properlyIlpo Järvinen1-10/+7
Don't use magic literals & comments but define a real field instead for UART_IIR_FIFO_ENABLED and name also the values. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221125130509.8482-5-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: 8250: Cleanup MCR literalsIlpo Järvinen1-1/+1
Use proper names from MCR bits. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221125130509.8482-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: 8250: Name MSR literalsIlpo Järvinen1-2/+2
Add UART_MSR_STATUS_BITS for CD, RI, DSR & CTS. Use names for the literal. Don't make the define for combined flags part of UAPI. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221125130509.8482-3-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: 8250: Use defined IER bitsIlpo Järvinen1-5/+5
Instead of literal 0x0f, add a define for enabling all IER bits the 8250 driver is interested in. Don't make the define for combined flags part of UAPI. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221125130509.8482-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: drop obsolete dependency on COMPILE_TESTJean Delvare1-1/+1
Since commit 0166dc11be91 ("of: make CONFIG_OF user selectable"), it is possible to test-build any driver which depends on OF on any architecture by explicitly selecting OF. Therefore depending on COMPILE_TEST as an alternative is no longer needed. It is actually better to always build such drivers with OF enabled, so that the test builds are closer to how each driver will actually be built on its intended target. Building them without OF may not test much as the compiler will optimize out potentially large parts of the code. In the worst case, this could even pop false positive warnings. Dropping COMPILE_TEST here improves the quality of our testing and avoids wasting time on non-existent issues. Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Karol Gugala <kgugala@antmicro.com> Cc: Mateusz Holenko <mholenko@antmicro.com> Cc: Gabriel Somlo <gsomlo@gmail.com> Cc: Joel Stanley <joel@jms.id.au> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Link: https://lore.kernel.org/r/20221125142756.3e51a28d@endymion.delvare Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: move polling putchar() functionGabriel Somlo1-8/+8
The polling liteuart_putchar() function is only called from methods conditionally enabled by CONFIG_SERIAL_LITEUART_CONSOLE. Move its definition closer to the console code where it is dependent on the same config option. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-15-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: add IRQ support for the TX pathGabriel Somlo1-17/+13
Switch the TX path to IRQ-driven operation, while maintaining support for polling mode via the poll timer. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-14-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: add IRQ support for the RX pathGabriel Somlo1-7/+74
Add support for IRQ-driven RX. Support for the TX path will be added in a separate commit. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-13-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: move function definitionsGabriel Somlo1-41/+41
Move definitions for liteuart_[stop|start]_tx(), liteuart_stop_rx(), and liteuart_putchar() to a more convenient location in preparation for adding IRQ support. This patch contains no functional changes. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-12-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: separate rx loop from poll timerGabriel Somlo1-3/+9
Convert the rx loop into its own dedicated function, and (for now) call it from the poll timer. This is in preparation for adding irq support to the receive path. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-11-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: clean up rx loop variablesGabriel Somlo1-4/+3
The `status` variable will always be `1` when passed into the call to `uart_insert_char()`, so it can be eliminated altogether. Use `u8` as the type for `ch`, as it matches the return type of the `litex_read8()` call which produces its value. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-10-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: simplify passing of uart_insert_char() flagGabriel Somlo1-2/+1
Simply provide the hard-coded TTY_NORMAL flag to uart_insert_char() directly -- no need to dedicate a variable for that exclusive purpose. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-9-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: rx loop should only ack rx eventsGabriel Somlo1-1/+1
While receiving characters, it is necessary to acknowledge each one by writing to the EV_PENDING register's EV_RX bit. Ensure we do not also gratuitously set the EV_TX bit in the process. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-8-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: move tty_flip_buffer_push() out of rx loopGabriel Somlo1-2/+2
Calling tty_flip_buffer_push() for each individual received character is overkill. Move it out of the rx loop, and only call it once per set of characters received together. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-7-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: minor style fix in liteuart_init()Gabriel Somlo1-4/+2
Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-6-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: don't set unused port fieldsGabriel Somlo1-2/+0
Remove regshift and iobase port fields, since they are unused by the driver. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-5-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-19serial: liteuart: remove unused uart_ops stubsGabriel Somlo1-17/+0
Remove stub uart_ops methods that are not called unconditionally from serial_core. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-4-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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