- 09 Apr, 2024 39 commits
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Andy Shevchenko authored
Serial core provides a standard timeout for polling modem state. Use it instead of a custom approach. Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20240402195306.269276-7-andriy.shevchenko@linux.intel.comSigned-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Andy Shevchenko authored
While there is no user of this callback in the kernel, it also breaks the relationship in the driver model. The correct implementation should be done via GPIO or regulator framework. Remove custom HW shutdown support for good and, if needed, we will implement it correctly later on. Signed-off-by:
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Andy Shevchenko authored
There is no user of the struct plat_max3100 outside the driver. Inline its contents into the driver. While at it, drop outdated example in the comment. Signed-off-by:
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Andy Shevchenko authored
Sparse is not happy about misuse of bitwise types: .../max3100.c:194:13: warning: incorrect type in assignment (different base types) .../max3100.c:194:13: expected unsigned short [addressable] [usertype] etx .../max3100.c:194:13: got restricted __be16 [usertype] .../max3100.c:202:15: warning: cast to restricted __be16 Fix this by choosing proper types for the respective variables. Fixes: 7831d56b ("tty: MAX3100") Signed-off-by:
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Andy Shevchenko authored
The removal of the last MAX3100 device triggers the removal of the driver. However, code doesn't update the respective global variable and after insmod — rmmod — insmod cycle the kernel oopses: max3100 spi-PRP0001:01: max3100_probe: adding port 0 BUG: kernel NULL pointer dereference, address: 0000000000000408 ... RIP: 0010:serial_core_register_port+0xa0/0x840 ... max3100_probe+0x1b6/0x280 [max3100] spi_probe+0x8d/0xb0 Update the actual state so next time UART driver will be registered again. Hugo also noticed, that the error path in the probe also affected by having the variable set, and not cleared. Instead of clearing it move the assignment after the successfull uart_register_driver() call. Fixes: 7831d56b ("tty: MAX3100") Signed-off-by:
Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20240402195306.269276-3-andriy.shevchenko@linux.intel.comSigned-off-by:
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Andy Shevchenko authored
uart_handle_cts_change() has to be called with port lock taken, Since we run it in a separate work, the lock may not be taken at the time of running. Make sure that it's taken by explicitly doing that. Without it we got a splat: WARNING: CPU: 0 PID: 10 at drivers/tty/serial/serial_core.c:3491 uart_handle_cts_change+0xa6/0xb0 ... Workqueue: max3100-0 max3100_work [max3100] RIP: 0010:uart_handle_cts_change+0xa6/0xb0 ... max3100_handlerx+0xc5/0x110 [max3100] max3100_work+0x12a/0x340 [max3100] Fixes: 7831d56b ("tty: MAX3100") Signed-off-by:
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Bastien Curutchet authored
The UART's input clock rate can change at runtime but this is not handled by the driver. Add a clock_notifier callback that updates the divisors when the input clock is updated. The serial8250_update_uartclk() is used to do so. PRE_RATE_CHANGE and ABORT_RATE_CHANGE notifications are ignored, only the POST_RATE_CHANGE is used. Not using PRE_RATE_CHANGE notification can result in a few corrupted bytes during frequency transitions but, IMHO, it can be acceptable in many use cases. It has been tested on a DAVINCI/OMAP-L138 processor. Signed-off-by:
Bastien Curutchet <bastien.curutchet@bootlin.com> Reviewed-by:
Herve Codina <herve.codina@bootlin.com> Link: https://lore.kernel.org/r/20240405120552.35991-1-bastien.curutchet@bootlin.comSigned-off-by:
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Kanak Shilledar authored
Convert the Actions Semi Owl UART to newer DT schema. Created DT schema based on the .txt file which had `compatible`, `reg` and `interrupts` as the required properties. This binding is used by Actions S500, S700 and S900 SoC. S700 and S900 use the same UART compatible string. Reviewed-by:
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by:
Kanak Shilledar <kanakshilledar111@protonmail.com> Link: https://lore.kernel.org/r/20240405080235.11563-1-kanakshilledar@gmail.comSigned-off-by:
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Uwe Kleine-König authored
There are considerations to drop platform_driver_probe() as a concept that isn't relevant any more today. It comes with an added complexity that makes many users hold it wrong. (E.g. this driver should have marked the driver struct with __refdata to prevent the below mentioned false positive section mismatch warning.) This fixes a W=1 build warning: WARNING: modpost: drivers/tty/serial/pmac_zilog: section mismatch in reference: pmz_driver+0x8 (section: .data) -> pmz_detach (section: .exit.text) Signed-off-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/5ea3174616abc9fa256f115b4fb175d289ac1754.1711748999.git.u.kleine-koenig@pengutronix.deTested-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Uwe Kleine-König authored
As described in the added code comment, a reference to .exit.text is ok for drivers registered via module_platform_driver_probe(). Make this explicit to prevent the following section mismatch warning WARNING: modpost: drivers/tty/amiserial: section mismatch in reference: amiga_serial_driver+0x8 (section: .data) -> amiga_serial_remove (section: .exit.text) that triggers on an allmodconfig W=1 build. Signed-off-by:
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Uwe Kleine-König authored
This change strips $abs_srctree of the input file containing the character mapping table in the generated output. The motivation for this change is Yocto emitting a build warning WARNING: linux-lxatac-6.7-r0 do_package_qa: QA Issue: File /usr/src/debug/linux-lxatac/6.7-r0/drivers/tty/vt/consolemap_deftbl.c in package linux-lxatac-src contains reference to TMPDIR So this change brings us one step closer to make the build result reproducible independent of the build path. Signed-off-by: -
Justin Stitt authored
strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect nc->if_name to be NUL-terminated based on existing manual NUL-byte assignments and checks: | nc.if_name[IFNAMSIZ-1] = '\0'; ... | if (nc->if_name[0] != '\0') Let's use the new 2-argument strscpy() since it guarantees NUL-termination on the destination buffer while correctly using the destination buffers size to bound the operation. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by:
Justin Stitt <justinstitt@google.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20240318-strncpy-drivers-tty-n_gsm-c-v1-1-da37a07c642e@google.comSigned-off-by:
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Colin Ian King authored
There is a statement with two semicolons. Remove the second one, it is redundant. Signed-off-by:
Colin Ian King <colin.i.king@gmail.com> Link: https://lore.kernel.org/r/20240315091734.2430416-1-colin.i.king@gmail.comSigned-off-by:
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Nghia Nguyen authored
R-Car V4M (R8A779H0) SoC has the R-Car Gen4 compatible SCIF ports, so document the SoC specific bindings. Signed-off-by:
Nghia Nguyen <nghia.nguyen.jg@renesas.com> Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Acked-by:
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Sebastian Andrzej Siewior authored
The driver is using "sifive,fu540-c000-uart0" as a binding. The device tree and documentation states "sifive,fu540-c000-uart" instead. This means the binding is not matched and not used. This did not cause any problems because the alternative binding, used in the device tree, "sifive,uart0" is not handling the hardware any different. Align the binding in the driver with the documentation. Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by:
Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20240307090950.eLELkuyK@linutronix.deSigned-off-by:
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Andy Shevchenko authored
of_gpio.h is deprecated and subject to remove. The driver doesn't use it directly, replace it with what is really being used. Signed-off-by:
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Andy Shevchenko authored
of_gpio.h is deprecated and subject to remove. The driver doesn't use it, simply remove the unused header. Signed-off-by:
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Tony Lindgren authored
Document the console option for DEVNAME:0.0 style addressing for serial ports. Suggested-by:
Sebastian Reichel <sre@kernel.org> Signed-off-by:
Tony Lindgren <tony@atomide.com> Reviewed-by:
Dhruva Gole <d-gole@ti.com> Link: https://lore.kernel.org/r/20240327110021.59793-8-tony@atomide.comSigned-off-by:
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Tony Lindgren authored
Prepare 8250 ISA ports to drop kernel command line serial console handling from console_setup(). We need to set the preferred console in serial8250_isa_init_ports() to drop a dependency to setup_console() handling the ttyS related quirks. Otherwise when console_setup() handles the ttyS related options, console gets enabled only at driver probe time. Note that this mostly affects x86 as this happens based on define SERIAL_PORT_DFNS. Signed-off-by:
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Tony Lindgren authored
In order to start moving the serial console quirks out of console_setup(), let's add parsing for the quirks to the serial core layer. We can use serial_base_add_one_prefcon() to handle the quirks. Note that eventually we may want to set up driver specific console quirk handling for the serial port device drivers to use. But we need to figure out which driver(s) need to call the quirk. So for now, we just handle the sparc quirk directly. Signed-off-by:
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Tony Lindgren authored
We can now add hardware based addressing for serial ports. Starting with commit 84a9582f ("serial: core: Start managing serial controllers to enable runtime PM"), and all the related fixes to this commit, the serial core now knows to which serial port controller the ports are connected. The serial ports can be addressed with DEVNAME:0.0 style naming. The names are something like 00:04:0.0 for a serial port on qemu, and something like 2800000.serial:0.0 on platform device using systems like ARM64 for example. The DEVNAME is the unique serial port hardware controller device name, AKA the name for port->dev. The 0.0 are the serial core controller id and port id. Typically 0.0 are used for each controller and port instance unless the serial port hardware controller has multiple controllers or ports. Using DEVNAME:0.0 style naming actually solves two long term issues for addressing the serial ports: 1. According to Andy Shevchenko, using DEVNAME:0.0 style naming fixes an issue where depending on the BIOS settings, the kernel serial port ttyS instance number may change if HSUART is enabled 2. Device tree using architectures no longer necessarily need to specify aliases to find a specific serial port, and we can just allocate the ttyS instance numbers dynamically in whatever probe order To do this, let's match the hardware addressing style console name to the character device name used, and add a preferred console using the character device name. Note that when using console=DEVNAME:0.0 style kernel command line, the 8250 serial console gets enabled later compared to using console=ttyS naming for ISA ports. This is because the serial port DEVNAME to character device mapping is not known until the serial driver probe time. If used together with earlycon, this issue is avoided. Signed-off-by:
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Tony Lindgren authored
If add_preferred_console() is not called early in setup_console(), we can end up having register_console() call try_enable_default_console() before a console device has called add_preferred_console(). Let's set console_set_on_cmdline flag in console_setup() to prevent this from happening. Signed-off-by:
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Tony Lindgren authored
Currently console_setup() tries to make a console index out of any digits passed in the kernel command line for console. In the DEVNAME:0.0 case, the name can contain a device IO address, so bail out on console names with a ':'. Signed-off-by:
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Tony Lindgren authored
Driver subsystems may need to translate the preferred console name to the character device name used. We already do some of this in console_setup() with a few hardcoded names, but that does not scale well. The console options are parsed early in console_setup(), and the consoles are added with __add_preferred_console(). At this point we don't know much about the character device names and device drivers getting probed. To allow driver subsystems to set up a preferred console, let's save the kernel command line console options. To add a preferred console from a driver subsystem with optional character device name translation, let's add a new function add_preferred_console_match(). This allows the serial core layer to support console=DEVNAME:0.0 style hardware based addressing in addition to the current console=ttyS0 style naming. And we can start moving console_setup() character device parsing to the driver subsystem specific code. We use a separate array from the console_cmdline array as the character device name and index may be unknown at the console_setup() time. And eventually there's no need to call __add_preferred_console() until the subsystem is ready to handle the console. Adding the console name in addition to the character device name, and a flag for an added console, could be added to the struct console_cmdline. And the console_cmdline array handling could be modified accordingly. But that complicates things compared saving the console options, and then adding the consoles when the subsystems handling the consoles are ready. Co-developed-by:
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Jiri Slaby (SUSE) authored
dma_map_single() provides much easier interface for simple mappings as used for RX in atmel_serial. So switch to that, removing all the s-g unnecessary handling. Signed-off-by:
Jiri Slaby (SUSE) <jirislaby@kernel.org> Cc: Richard Genoud <richard.genoud@gmail.com> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Claudiu Beznea <claudiu.beznea@tuxon.dev> Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20240405060826.2521-16-jirislaby@kernel.orgSigned-off-by:
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Jiri Slaby (SUSE) authored
It is repeated in the code and there is also a big warning by ATMEL_SERIAL_RINGSIZE. So define ATMEL_SERIAL_RX_SIZE and use it appropriatelly. The macro uses array_size() and kmalloc_array() is switched to kmalloc(). Signed-off-by:
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Jiri Slaby (SUSE) authored
dma_map_single() provides much easier interface for simple mappings as used for TX in atmel_serial. So switch to that, removing all the s-g unnecessary handling. Note that it is not easy (maybe impossible) to use kfifo_dma_* API for atmel's serial purposes. It handles DMA very specially. Signed-off-by:
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Jiri Slaby (SUSE) authored
Switch from struct circ_buf to proper kfifo. kfifo provides much better API, esp. when wrap-around of the buffer needs to be taken into account. Look at pl011_dma_tx_refill() or cpm_uart_tx_pump() changes for example. Kfifo API can also fill in scatter-gather DMA structures, so it easier for that use case too. Look at lpuart_dma_tx() for example. Note that not all drivers can be converted to that (like atmel_serial), they handle DMA specially. Note that usb-serial uses kfifo for TX for ages. omap needed a bit more care as it needs to put a char into FIFO to start the DMA transfer when OMAP_DMA_TX_KICK is set. In that case, we have to do kfifo_dma_out_prepare twice: once to find out the tx_size (to find out if it is worths to do DMA at all -- size >= 4), the second time for the actual transfer. All traces of circ_buf are removed from serial_core.h (and its struct uart_state). Signed-off-by:
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Jiri Slaby (SUSE) authored
This is a preparatory for the serial-to-kfifo switch. kfifo understands only scatter-gatter approach, so switch to that. No functional change intended, it's just dmaengine_prep_slave_single() inline expanded. And in this case, switch from dma_map_single() to dma_map_sg() too. This needs struct msm_dma changes. I split the rx and tx parts into an union. TX is now struct scatterlist, RX remains the old good phys-virt-count triple. Signed-off-by:
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Jiri Slaby (SUSE) authored
This is a preparatory for the serial-to-kfifo switch. kfifo understands only scatter-gatter approach, so switch to that. No functional change intended, it's just dmaengine_prep_slave_single() inline expanded. Signed-off-by:
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Jiri Slaby (SUSE) authored
This is a preparatory for the serial-to-kfifo switch. kfifo understands only scatter-gatter approach, so switch to that. No functional change intended, it's just dmaengine_prep_slave_single() inline expanded. Signed-off-by:
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Jiri Slaby (SUSE) authored
Obviously: "This macro finish" -> "This macro finishes" and similar. Signed-off-by:
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Jiri Slaby (SUSE) authored
When the kfifo buffer is already dma-mapped, one cannot use the kfifo API to fill in an SG list. Add kfifo_dma_in_prepare_mapped() which allows exactly this. A mapped dma_addr_t is passed and it is filled into provided sgl too. Including the dma_len. Signed-off-by:
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Jiri Slaby (SUSE) authored
As a preparatory for dma addresses filling, we need the data offset instead of virtual pointer in setup_sgl_buf(). So pass the former instead the latter. And pointer to fifo is needed in setup_sgl_buf() now too. Signed-off-by:
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Jiri Slaby (SUSE) authored
So that one can make any sense of the name. Signed-off-by:
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Jiri Slaby (SUSE) authored
First, there is no such user. The only user of this interface is caam_rng_fill_async() and that uses kfifo_alloc() -> kmalloc(). Second, the implementation does not allow anything else than direct mapping and kmalloc() (due to virt_to_phys()), anyway. Therefore, there is no point in having this dead (and complex) code in the kernel. Note the setup_sgl_buf() function now boils down to simple sg_set_buf(). That is called twice from setup_sgl() to take care of kfifo buffer wrap-around. setup_sgl_buf() will be extended shortly, so keeping it in place. Signed-off-by:
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Jiri Slaby (SUSE) authored
These are helpers which are going to be used in the serial layer. We need a wrapper around kfifo which provides us with a tail (sometimes "tail" offset, sometimes a pointer) to the kfifo data. And which returns count of available data -- but not larger than to the end of the buffer (hence _linear in the names). I.e. something like CIRC_CNT_TO_END() in the legacy circ_buf. This patch adds such two helpers. Signed-off-by:
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Jiri Slaby (SUSE) authored
kfifo_skip_count() is an extended version of kfifo_skip(), accepting also count. This will be useful in the serial code later. Now, it can be used to implement both kfifo_skip() and kfifo_dma_out_finish(). In the latter, 'len' only needs to be divided by 'type' size (as it was until now). And stop using statement expressions when the return value is cast to 'void'. Use classic 'do {} while (0)' instead. Note: perhaps we should skip 'count' records for the 'recsize' case, but the original (kfifo_dma_out_finish()) used to skip only one record. So this is kept unchanged and 'count' is still ignored in the recsize case. Signed-off-by: -
Jiri Slaby (SUSE) authored
It is the same as __kfifo_skip_r(), so: * drop __kfifo_dma_out_finish_r() completely, and * replace its (only) use by __kfifo_skip_r(). Signed-off-by:
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- 07 Apr, 2024 1 commit
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Linus Torvalds authored
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