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linux/include/linux/serial_8250.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 normalized pattern(s): 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 either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 08:55:01 +02:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
serial: 8250: RT288x/Au1xxx code away from core A non-trivial amount of RT288x/Au1xxx code is encapsulated into ifdeffery in 8250_port / 8250_early and some if UPIO_AU blocks. Create a separate file from them. Also handle errors properly in the cases where RT288x/Au1xxx code is not configured. It seems that 0x1000 mapsize is likely overkill but I've kept it the same as previously (the value was shrunk to that value in commit b2b13cdfd05e ("SERIAL 8250: Fixes for Alchemy UARTs.")). Seemingly, the driver only needs to access register at 0x28 for the divisor latch. The Kconfig side is a bit tricky. As SERIAL_8250_RT288X is bool it can only be =y. It is possible to have SERIAL_8250=m + SERIAL_8250_RT288X=y which required altering when 8250/ is included or the rt288x would not be built. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-5-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:27 +03:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
serial: 8250: include <linux/serial_reg.h> from serial_8250.h The header file, include/linux/serial_8250.h, contains references to UART_LSR_BRK_ERROR_BITS and UART_MSR_ANY_DELTA that are defined in <linux/serial_reg.h>. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-05-26 13:28:48 +09:00
Create platform_device.h to contain all the platform device details. Convert everyone who uses platform_bus_type to include linux/platform_device.h. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-29 19:07:23 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port Add mapsize, bugs, and divisor latch read/write functions (->dl_read/write()) into plat_serial8250_port to carry the setup necessary for RT288x/Au1xxx devices over to uart port. Document the added members with kerneldoc style but do not enable kerneldoc yet as there are many fields which remain undocumented. While at it, convert .bugs in struct uart_8250_port to u16 to match it with the type used in struct plat_serial8250_port. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:26 +03:00
[SERIAL] Move serial8250_*_port prototypes to linux/serial_8250.h Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-01 15:56:26 +01:00
serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port Add mapsize, bugs, and divisor latch read/write functions (->dl_read/write()) into plat_serial8250_port to carry the setup necessary for RT288x/Au1xxx devices over to uart port. Document the added members with kerneldoc style but do not enable kerneldoc yet as there are many fields which remain undocumented. While at it, convert .bugs in struct uart_8250_port to u16 to match it with the type used in struct plat_serial8250_port. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:26 +03:00
[SERIAL] Move serial8250_*_port prototypes to linux/serial_8250.h Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-01 15:56:26 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
Use resource_size_t for serial port IO addresses At present, various parts of the serial code use unsigned long to define resource addresses. This is a problem, because some 32-bit platforms have physical addresses larger than 32-bits, and have mmio serial uarts located above the 4GB point. This patch changes the type of mapbase in both struct uart_port and struct plat_serial8250_port to resource_size_t, which can be configured to be 64 bits on such platforms. The mapbase in serial_struct can't safely be changed, because that structure is user visible. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mackerras <paulus@samba.org> Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-23 18:43:44 -07:00
serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port Add mapsize, bugs, and divisor latch read/write functions (->dl_read/write()) into plat_serial8250_port to carry the setup necessary for RT288x/Au1xxx devices over to uart port. Document the added members with kerneldoc style but do not enable kerneldoc yet as there are many fields which remain undocumented. While at it, convert .bugs in struct uart_8250_port to u16 to match it with the type used in struct plat_serial8250_port. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:26 +03:00
serial: 8250: Reorder fields in 'struct plat_serial8250_port' Group some variables based on their sizes to reduce hole and avoid padding. On x86_64, this shrinks the size of 'struct plat_serial8250_port' from 144 to 128 bytes. It saves a few bytes of memory. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/f3cb1efe1454e0615840fd331ee335bc441589a9.1676665358.git.christophe.jaillet@wanadoo.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-02-17 21:22:57 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
serial: 8250: add IRQ trigger support There is currently no provision for passing IRQ trigger flags for serial IRQs with triggering requirements (such as GPIO IRQs) This patch adds irqflags to plat_serial8250_port that can be passed from board file to reqest_irq() of 8250 driver Changes are backward compatible with boards passing UPF_SHARE_IRQ flag Tested on Zoom2 board that has IRQF_TRIGGER_RISING requirement for 8250 irq [Moved new flag to end to fix bugs in the original with the old_serial array -- Alan] Signed-off-by: Vikram Pandita <vikram.pandita@ti.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-09-19 13:13:19 -07:00
8250.c: support specifying DW APB UARTs in device platform_data Allow the private_data field to be specified in platform_data for the standard 8250/16550 UART. This field is used by DW APB type UARTs and without this patch it's only possible to set this field when registering the port by hand. If private_data is not set then the driver will potentially oops with a NULL pointer dereference. Signed-off-by: Will Newton <will.newton@gmail.com> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-04 22:27:50 -08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
[PATCH] Serial: Split 8250 port table Add separate files for the different 8250 ISA-based serial boards. Looking across all the various architectures, it seems reasonable that we can key the availability of the configuration options for these beasts to the bus-related symbols (iow, CONFIG_ISA). We also standardise the base baud/uart clock rate for these boards - I'm sure that isn't architecture specific, but is solely dependent on the crystal fitted on the board (which should be the same no matter what type of machine its fitted into.) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-06-27 11:12:54 +01:00
tty/serial: Migrate 8250_fsl to use has_sysrq The SUPPORT_SYSRQ ifdeffery is not nice as: - May create misunderstanding about sizeof(struct uart_port) between different objects - Prevents moving functions from serial_core.h - Reduces readability (well, it's ifdeffery - it's hard to follow) In order to remove SUPPORT_SYSRQ, has_sysrq variable has been added. Initialise it in driver's probe and remove ifdeffery. In contrast to 8250/8250_of, legacy_serial on powerpc does fill (struct plat_serial8250_port). The reason is likely that it's done on device_initcall(), not on probe. So, 8250_core is not yet probed. Propagate value from platform_device on 8250 probe - in case powepc legacy driver it's initialized on initcall, in case 8250_of it will be initialized later on of_platform_serial_setup(). Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Dmitry Safonov <dima@arista.com> Link: https://lore.kernel.org/r/20191213000657.931618-6-dima@arista.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-13 00:06:04 +00:00
Serial: Allow port type to be specified when calling serial8250_register_port. Add flag value UPF_FIXED_TYPE which specifies that the UART type is known and should not be probed. For this case the UARTs properties are just copied out of the uart_config entry. This allows us to keep SOC specific 8250 probe code out of 8250.c. In this case we know the serial hardware will not be changing as it is on the same silicon as the CPU, and we can specify it with certainty in the board/cpu setup code. The alternative is to load up 8250.c with a bunch of OCTEON specific special cases in the probing code. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-02 13:49:54 +00:00
serial: 8250: Reorder fields in 'struct plat_serial8250_port' Group some variables based on their sizes to reduce hole and avoid padding. On x86_64, this shrinks the size of 'struct plat_serial8250_port' from 144 to 128 bytes. It saves a few bytes of memory. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/f3cb1efe1454e0615840fd331ee335bc441589a9.1676665358.git.christophe.jaillet@wanadoo.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-02-17 21:22:57 +01:00
serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port Add mapsize, bugs, and divisor latch read/write functions (->dl_read/write()) into plat_serial8250_port to carry the setup necessary for RT288x/Au1xxx devices over to uart port. Document the added members with kerneldoc style but do not enable kerneldoc yet as there are many fields which remain undocumented. While at it, convert .bugs in struct uart_8250_port to u16 to match it with the type used in struct plat_serial8250_port. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:26 +03:00
serial: 8250: sanitize uart_port::serial_{in,out}() types uart_port::{serial_in,serial_out} (and plat_serial8250_port::* likewise) historically use: * 'unsigned int' for 32-bit register values in reads and writes, and * 'int' for offsets. Make them sane such that: * 'u32' is used for register values, and * 'unsigned int' is used for offsets. While at it, name hooks' parameters, so it is clear what is what. Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Paul Cercueil <paul@crapouillou.net> Cc: Vladimir Zapolskiy <vz@mleia.com> Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20250611100319.186924-9-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-06-11 12:02:54 +02:00
serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port Add mapsize, bugs, and divisor latch read/write functions (->dl_read/write()) into plat_serial8250_port to carry the setup necessary for RT288x/Au1xxx devices over to uart port. Document the added members with kerneldoc style but do not enable kerneldoc yet as there are many fields which remain undocumented. While at it, convert .bugs in struct uart_8250_port to u16 to match it with the type used in struct plat_serial8250_port. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:26 +03:00
U6715 16550A serial driver support UART Features extract from STEricsson U6715 data-sheet (arm926 SoC for mobile phone): * Fully compatible with industry standard 16C550 and 16C450 from various manufacturers * RX and TX 64 byte FIFO reduces CPU interrupts * Full double buffering * Modem control signals include CTS, RTS, (and DSR, DTR on UART1 only) * Automatic baud rate selection * Manual or automatic RTS/CTS smart hardware flow control * Programmable serial characteristics: – Baud rate generation (50 to 3.25M baud) – 5, 6, 7 or 8-bit characters – Even, odd or no-parity bit generation and detection – 1, 1.5 or 2 stop bit generation * Independent control of transmit, receive, line status, data set interrupts and FIFOs * Full status-reporting capabilities * Separate DMA signaling for RX and TX * Timed interrupt to spread receive interrupt on known duration * DMA time-out interrupt to allow detection of end of reception * Carkit pulse coding and decoding compliant with USB carkit control interface [40] In 16550A auto-configuration, if the fifo size is 64 then it's an U6 16550A port Add set_termios hook & export serial8250_do_set_termios to change uart clock following baudrate Signed-off-by: Philippe Langlais <philippe.langlais@stericsson.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-07-29 17:13:57 +02:00
serial: Make ->set_termios() old ktermios const There should be no reason to adjust old ktermios which is going to get discarded anyway. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220816115739.10928-7-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-08-16 14:57:37 +03:00
serial: 8250: Expose set_ldisc function Expose set_ldisc() function so that it can be overridden with a platform specific implementation. Signed-off-by: Ed Blake <ed.blake@imgtec.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-11-10 18:07:55 +00:00
serial: 8250: export get_mctrl function Exposes get_mctrl() function so that it can be overriden with platform specific implementation. Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-04-06 12:06:51 +08:00
tty: serial8250: allow platforms to override irq handler Some ports (e.g. Synopsys DesignWare 8250) have special requirements for handling the interrupts. Allow these platforms to specify their own interrupt handler that will override the default. serial8250_handle_irq() is provided so that platforms can extend the IRQ handler rather than completely replacing it. Signed-off-by: Jamie Iles <jamie@jamieiles.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-15 10:17:52 +01:00
8250: allow platforms to override PM hook. Add a hook for platforms to specify custom pm methods. Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-09-25 15:13:45 +02:00
tegra, serial8250: add ->handle_break() uart_port op The "KT" serial port has another use case for a "received break" quirk, so before adding another special case to the 8250 core take this opportunity to push such quirks out of the core and into a uart_port op. Stephen says: "If the callback function is to no longer live in 8250.c itself, arch/arm/mach-tegra/devices.c isn't logically a good place to put it, and that file will be going away once we get rid of all the board files and move solely to device tree." ...so since 8250_pci.c houses all the quirks for pci serial devices this quirk is similarly housed in of_serial.c. Once the open firmware conversion completes the infrastructure details (include/linux/of_serial.h, and the export) can all be removed to make this self contained to of_serial.c. Cc: Nhan H Mai <nhan.h.mai@intel.com> Cc: Colin Cross <ccross@android.com> Cc: Olof Johansson <olof@lixom.net> [stephen: kill CONFIG_SERIAL_TEGRA in favor just using CONFIG_ARCH_TEGRA] Cc: Grant Likely <grant.likely@secretlab.ca> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Sudhakar Mamillapalli <sudhakar@fb.com> Reported-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Tested-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-10 14:10:53 -07:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
[SERIAL] Use an enum for serial8250 platform device IDs Rather than hard-coding the platform device IDs, enumerate them. We don't particularly care about the actual ID we get, just as long as they're unique. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-08 16:04:41 +01:00
[ARM] 3383/3: ixp2000: ixdp2x01 platform serial conversion Patch from Lennert Buytenhek Add a PLAT8250_DEV_PLATFORM2, and convert the two ixdp2x01 CPLD serial ports to use platform serial devices with ids PLAT8250_DEV_PLATFORM[12]. (The on-chip xscale UART is PLAT8250_DEV_PLATFORM, id #0.) Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-25 23:03:13 +00:00
[SERIAL] Use an enum for serial8250 platform device IDs Rather than hard-coding the platform device IDs, enumerate them. We don't particularly care about the actual ID we get, just as long as they're unique. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-08 16:04:41 +01:00
[PATCH] Exar quad port serial This is on our "Envoy" boxes which we have, according to the documentation, an "Exar ST16C554/554D Quad UART with 16-byte Fifo's". The box also has two other "on-board" serial ports and a modem chip. The two on-board serial UARTs were being detected along with the first two Exar UARTs. The last two Exar UARTs were not showing up and neither was the modem. This patch was the only way I could the kernel to see beyond the standard four serial ports and get all four of the Exar UARTs to show up. [akpm@osdl.org: build fix] Signed-off-by: Paul B Schroeder <pschroeder@uplogix.com> Cc: Lennart Sorensen <lsorense@csclub.uwaterloo.ca> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-06 20:37:03 -08:00
[SERIAL] Use an enum for serial8250 platform device IDs Rather than hard-coding the platform device IDs, enumerate them. We don't particularly care about the actual ID we get, just as long as they're unique. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-08 16:04:41 +01:00
[SERIAL] Support Au1x00 8250 UARTs using the generic 8250 driver. The offsets of the registers are in a different place, and some parts cannot handle a full set of modem control signals. Signed-off-by: Pantelis Antoniou <pantelis@embeddedalley.ocm> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-06 09:07:03 +00:00
sm501: add uart support This patch extends the sm501 mfd with 8250 uart support. We're currently doing this in the board specific r2d-1 code already, but it would be nice to do move things into the mfd since it's more chip specific than board specific. Signed-off-by: Magnus Damm <damm@igel.co.jp> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-28 02:14:22 -07:00
[SERIAL] Use an enum for serial8250 platform device IDs Rather than hard-coding the platform device IDs, enumerate them. We don't particularly care about the actual ID we get, just as long as they're unique. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-08 16:04:41 +01:00
serial: 8250: Add support for dmaengine Add support for dmaengine API. The drivers can implement the struct uart_8250_dma member in struct uart_8250_port and 8250.c can take care of the rest. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-10 11:25:11 +02:00
serial: 8250: Separate legacy irq handling from core port operations Prepare for 8250 split; decouple irq setup/teardown and handler from core port operations. Introduce setup_irq() and release_irq() 8250 driver methods; the 8250 core will use these methods to install and remove irq handling for the given 8250 port. Refactor irq chain linking/unlinking from 8250 core into univ8250_setup_irq()/univ8250_release_irq() for the universal 8250 driver. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-02-24 14:25:07 -05:00
serial: 8250: Toggle IER bits on only after irq has been set up Invoking TIOCVHANGUP on 8250_mid port on Ice Lake-D and then reopening the port triggers these faults during serial8250_do_startup(): DMAR: DRHD: handling fault status reg 3 DMAR: [DMA Write NO_PASID] Request device [00:1a.0] fault addr 0x0 [fault reason 0x05] PTE Write access is not set If the IRQ hasn't been set up yet, the UART will have zeroes in its MSI address/data registers. Disabling the IRQ at the interrupt controller won't stop the UART from performing a DMA write to the address programmed in its MSI address register (zero) when it wants to signal an interrupt. The UARTs (in Ice Lake-D) implement PCI 2.1 style MSI without masking capability, so there is no way to mask the interrupt at the source PCI function level, except disabling the MSI capability entirely, but that would cause it to fall back to INTx# assertion, and the PCI specification prohibits disabling the MSI capability as a way to mask a function's interrupt service request. The MSI address register is zeroed by the hangup as the irq is freed. The interrupt is signalled during serial8250_do_startup() performing a THRE test that temporarily toggles THRI in IER. The THRE test currently occurs before UART's irq (and MSI address) is properly set up. Refactor serial8250_do_startup() such that irq is set up before the THRE test. The current irq setup code is intermixed with the timer setup code. As THRE test must be performed prior to the timer setup, extract it into own function and call it only after the THRE test. The ->setup_timer() needs to be part of the struct uart_8250_ops in order to not create circular dependency between 8250 and 8250_base modules. Fixes: 40b36daad0ac ("[PATCH] 8250 UART backup timer") Reported-by: Lennert Buytenhek <buytenh@arista.com> Tested-by: Lennert Buytenhek <buytenh@arista.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220922070005.2965-1-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-09-22 10:00:05 +03:00
serial: 8250: Separate legacy irq handling from core port operations Prepare for 8250 split; decouple irq setup/teardown and handler from core port operations. Introduce setup_irq() and release_irq() 8250 driver methods; the 8250 core will use these methods to install and remove irq handling for the given 8250 port. Refactor irq chain linking/unlinking from 8250 core into univ8250_setup_irq()/univ8250_release_irq() for the universal 8250 driver. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-02-24 14:25:07 -05:00
serial: 8250: Add support for dmaengine Add support for dmaengine API. The drivers can implement the struct uart_8250_dma member in struct uart_8250_port and 8250.c can take care of the rest. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-10 11:25:11 +02:00
tty: Add software emulated RS485 support for 8250 Implementation of software emulation of RS485 direction handling is based on omap_serial driver. Before and after transmission RTS is set to the appropriate value. Note that before calling serial8250_em485_init() the caller has to ensure that UART will interrupt when shift register empty. Otherwise, emultaion cannot be used. Both serial8250_em485_init() and serial8250_em485_destroy() are idempotent functions. Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-01 21:09:21 +03:00
serial: 8250: Use hrtimers for rs485 delays Previously the timers where based on the classic timers, giving a too coarse resolution on systems with configs of less than 1000 HZ. This patch changes the rs485 timers to hrtimers. Signed-off-by: Rafael Gago Castano <rgc@hms.se> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-07-31 10:46:43 +02:00
serial: 8250: Generalize rs485 software emulation Commit e490c9144cfa ("tty: Add software emulated RS485 support for 8250") introduced support to use RTS as an rs485 Transmit Enable signal. So far the only drivers taking advantage of it are 8250_omap.c and 8250_of.c. We're about to make use of the feature in 8250_bcm2835aux.c as well. The bcm2835aux differs from omap chips by inverting the meaning of RTS in the MCR register. Moreover, omap achieves half-duplex mode by disabling the RX interrupt and clearing the RX FIFO when TX stops. The bcm2835aux requires disabling the receiver instead. Support these behavioral differences by generalizing the rs485 emulation: Introduce ->rs485_start_tx() and ->rs485_stop_tx() callbacks in struct uart_8250_port, provide generic implementations containing the existing code and use them as callbacks in 8250_omap.c and 8250_of.c. start_tx_rs485() is idempotent in that it recognizes whether RTS is already asserted. Achieve the same by introducing a tx_stopped flag in struct uart_8250_em485. This may even perform a little better on arches where memory access is faster than mmio access. Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: Matwey V. Kornilov <matwey@sai.msu.ru> Link: https://lore.kernel.org/r/5ac0464ae4414708e723a1e0d52b0c1b2bd41b9b.1582895077.git.lukas@wunner.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-28 14:31:06 +01:00
tty: Add software emulated RS485 support for 8250 Implementation of software emulation of RS485 direction handling is based on omap_serial driver. Before and after transmission RTS is set to the appropriate value. Note that before calling serial8250_em485_init() the caller has to ensure that UART will interrupt when shift register empty. Otherwise, emultaion cannot be used. Both serial8250_em485_init() and serial8250_em485_destroy() are idempotent functions. Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-01 21:09:21 +03:00
[SERIAL] Move serial8250_*_port prototypes to linux/serial_8250.h Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-01 15:56:26 +01:00
serial: 8250: Document uart_8250_port's ->dl_read/write() Add documentation for the struct uart_8250_port divisor latch function pointers. Documentation is in kernel doc format but don't enable kernel doc yet as many other fields remain undocumented. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-3-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:25 +03:00
[SERIAL] Move serial8250_*_port prototypes to linux/serial_8250.h Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-01 15:56:26 +01:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
serial: 8250: Add IrDA to UART capabilities Add an IrDA UART capability flag and change the type of uart_8250_port.capabilities to be u32 rather than unsigned short to accommodate the additional flag. Signed-off-by: Ed Blake <ed.blake@imgtec.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-11-10 18:07:54 +00:00
serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port Add mapsize, bugs, and divisor latch read/write functions (->dl_read/write()) into plat_serial8250_port to carry the setup necessary for RT288x/Au1xxx devices over to uart port. Document the added members with kerneldoc style but do not enable kerneldoc yet as there are many fields which remain undocumented. While at it, convert .bugs in struct uart_8250_port to u16 to match it with the type used in struct plat_serial8250_port. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:26 +03:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers Add tunable RX interrupt trigger I/F of FIFO buffers. Serial devices are used as not only message communication devices but control or sending communication devices. For the latter uses, normally small data will be exchanged, so user applications want to receive data unit as soon as possible for real-time tendency. If we have a sensor which sends a 1 byte data each time and must control a device based on the sensor feedback, the RX interrupt should be triggered for each data. According to HW specification of serial UART devices, RX interrupt trigger can be changed, but the trigger is hard-coded. For example, RX interrupt trigger in 16550A can be set to 1, 4, 8, or 14 bytes for HW, but current driver sets the trigger to only 8bytes. This patch makes some devices change RX interrupt trigger from userland. <How to use> - Read current setting # cat /sys/class/tty/ttyS0/rx_trig_bytes 8 - Write user setting # echo 1 > /sys/class/tty/ttyS0/rx_trig_bytes # cat /sys/class/tty/ttyS0/rx_trig_bytes 1 <Support uart devices> - 16550A and Tegra (1, 4, 8, or 14 bytes) - 16650V2 (8, 16, 24, or 28 bytes) - 16654 (8, 16, 56, or 60 bytes) - 16750 (1, 16, 32, or 56 bytes) <Change log> Changes in V9: - Use attr_group instead of dev_spec_attr_group of uart_port structure Changes in V8: - Divide this patch from V7's patch based on Greg's comment Changes in V7: - Add Documentation - Change I/F name from rx_int_trig to rx_trig_bytes because the name rx_int_trig is hard to understand how users specify the value Changes in V6: - Move FCR_RX_TRIG_* definition in 8250.h to include/uapi/linux/serial_reg.h, rename those to UART_FCR_R_TRIG_*, and use UART_FCR_TRIGGER_MASK to UART_FCR_R_TRIG_BITS() - Change following function names: convert_fcr2val() => fcr_get_rxtrig_bytes() convert_val2rxtrig() => bytes_to_fcr_rxtrig() - Fix typo in serial8250_do_set_termios() - Delete the verbose error message pr_info() in bytes_to_fcr_rxtrig() - Rename *rx_int_trig/rx_trig* to *rxtrig* for several functions or variables (but UI remains rx_int_trig) - Change the meaningless variable name 'val' to 'bytes' following functions: fcr_get_rxtrig_bytes(), bytes_to_fcr_rxtrig(), do_set_rxtrig(), do_serial8250_set_rxtrig(), and serial8250_set_attr_rxtrig() - Use up->fcr in order to get rxtrig_bytes instead of rx_trig_raw in fcr_get_rxtrig_bytes() - Use conf_type->rxtrig_bytes[0] instead of switch statement for support check in register_dev_spec_attr_grp() - Delete the checking whether a user changed FCR or not when minimum buffer is needed in serial8250_do_set_termios() Changes in V5.1: - Fix FCR_RX_TRIG_MAX_STATE definition Changes in V5: - Support Tegra, 16650V2, 16654, and 16750 - Store default FCR value to up->fcr when the port is first created - Add rx_trig_byte[] in uart_config[] for each device and use rx_trig_byte[] in convert_fcr2val() and convert_val2rxtrig() Changes in V4: - Introduce fifo_bug flag in uart_8250_port structure This is enabled only when parity is enabled and UART_BUG_PARITY is enabled for up->bugs. If this flag is enabled, user cannot set RX trigger. - Return -EOPNOTSUPP when it does not support device at convert_fcr2val() and at convert_val2rxtrig() - Set the nearest lower RX trigger when users input a meaningless value at convert_val2rxtrig() - Check whether p->fcr is existing at serial8250_clear_and_reinit_fifos() - Set fcr = up->fcr in the begging of serial8250_do_set_termios() Changes in V3: - Change I/F from ioctl(2) to sysfs(rx_int_trig) Changed in V2: - Use _IOW for TIOCSFIFORTRIG definition - Pass the interrupt trigger value itself Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-16 01:19:36 +00:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
tty: serial: 8250: use 32bit variable for rpm_tx_active The kbuild test robot wrote me: | make.cross ARCH=powerpc |>> ERROR: ".__xchg_called_with_bad_pointer" [drivers/tty/serial/8250/8250.ko] undefined! The generic implementation of xchg() on arm and x86 works for variables of size one bye (char). According to the report powerpc does not support xchg() for one byte sized variables and looking further it seems also to be the same case for sparc and tile (or for 10 out of 26 architectures which provide a custom implementation). For that reason I increase the size of the variable from one to four bytes to get it work on powerpc (and the others). Reported-By: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-29 10:21:03 +02:00
serial: 8250: Use canary to restart console after suspend When using no_console_suspend, the serial console may be powered off anyway during system sleep. Upon resume, the port may be in its default power-on state, but is expected to continue console i/o before the device has received its pm callback. The resultant garbage i/o can cause all kinds of havoc on the remote end. Use the scratch register as a canary to discover if the console has been powered-off. Write a non-zero value to the scratch register at port suspend and reprogram the port before any console i/o if the scratch register != canary before port resume. This workaround is disabled for omap_8250 (which uses different divisor programming). Credit to Doug Anderson <dianders@chromium.org> for the idea of using the scratch register canary to discover port power-down. Cc: Doug Anderson <dianders@chromium.org> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-01-22 12:24:30 -05:00
serial: 8250: Decouple RSA probe Prepare for 8250 split; separate RSA probe and resource management from base port operations. Override base port operations for the config_port(), request_port() and release_port() methods to implement the optional RSA probe and resource management only in the universal/legacy 8250 driver. Introduce 'probe' flags for 8250 ports, which allows drivers higher up the driver stack to enable optional probes. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-02-24 14:25:14 -05:00
tty/serial/8250: use mctrl_gpio helpers This patch permits the usage for GPIOs to control the CTS/RTS/DTR/DSR/DCD/RI signals. Changed by Stefan: Only call mctrl_gpio_init(), if the device has no ACPI companion device to not break existing ACPI based systems. Also only use the mctrl_gpio_ functions when "gpios" is available. Use MSR / MCR <-> TIOCM wrapper functions. Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com> Signed-off-by: Stefan Roese <sr@denx.de> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Yegor Yefremov <yegorslists@googlemail.com> Cc: Mika Westerberg <mika.westerberg@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Giulio Benetti <giulio.benetti@micronovasrl.com> Cc: Yegor Yefremov <yegorslists@googlemail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-20 08:24:20 +02:00
serial: 8250: Decouple RSA probe Prepare for 8250 split; separate RSA probe and resource management from base port operations. Override base port operations for the config_port(), request_port() and release_port() methods to implement the optional RSA probe and resource management only in the universal/legacy 8250 driver. Introduce 'probe' flags for 8250 ports, which allows drivers higher up the driver stack to enable optional probes. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-02-24 14:25:14 -05:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
serial: 8250: make saved LSR larger DW flags address received as BIT(8) in LSR. In order to not lose that on read, enlarge lsr_saved_flags to u16. Adjust lsr/status variables and related call chains to use u16. Technically, some of these type conversion would not be needed but it doesn't hurt to be consistent. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220624204210.11112-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-24 23:42:05 +03:00
serial: 8250: create lsr_save_mask Allow drivers to alter LSR save mask. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220624204210.11112-3-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-24 23:42:06 +03:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
serial: 8250: Add support for dmaengine Add support for dmaengine API. The drivers can implement the struct uart_8250_dma member in struct uart_8250_port and 8250.c can take care of the rest. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-10 11:25:11 +02:00
serial: 8250: Separate legacy irq handling from core port operations Prepare for 8250 split; decouple irq setup/teardown and handler from core port operations. Introduce setup_irq() and release_irq() 8250 driver methods; the 8250 core will use these methods to install and remove irq handling for the given 8250 port. Refactor irq chain linking/unlinking from 8250 core into univ8250_setup_irq()/univ8250_release_irq() for the universal 8250 driver. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-02-24 14:25:07 -05:00
serial: 8250: Add support for dmaengine Add support for dmaengine API. The drivers can implement the struct uart_8250_dma member in struct uart_8250_port and 8250.c can take care of the rest. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-10 11:25:11 +02:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
serial: 8250: Change dl_read/write to handle value as u32 Divisor latch read/write functions currently handle the value is int. As the value is related to HW context, u32 makes much more sense than a signed type. While at it, name the parameters in the callback signature. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:24 +03:00
tty: Add software emulated RS485 support for 8250 Implementation of software emulation of RS485 direction handling is based on omap_serial driver. Before and after transmission RTS is set to the appropriate value. Note that before calling serial8250_em485_init() the caller has to ensure that UART will interrupt when shift register empty. Otherwise, emultaion cannot be used. Both serial8250_em485_init() and serial8250_em485_destroy() are idempotent functions. Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-01 21:09:21 +03:00
serial: 8250: Provide flag for IER toggling for RS485 For RS485 mode, if SER_RS485_RX_DURING_TX is not available, the console ->write() callback needs to enable/disable Tx. It does this by calling the ->rs485_start_tx() and ->rs485_stop_tx() callbacks. However, some of these callbacks also disable/enable interrupts and makes power management calls. This causes 2 problems for console writing: 1. A console write can occur in contexts that are illegal for pm_runtime_*(). It is not even necessary for console writing to use pm_runtime_*() because a console already does this in serial8250_console_setup() and serial8250_console_exit(). 2. The console ->write() callback already handles disabling/enabling the interrupts by properly restoring the previous IER value. Add an argument @toggle_ier to the ->rs485_start_tx() and ->rs485_stop_tx() callbacks to specify if they may disable/enable receive interrupts while using pm_runtime_*(). Console writing will not allow the toggling. For all call sites other than console writing there is no functional change. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20250107212702.169493-5-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-01-07 22:33:00 +01:06
serial: 8250: Rate limit serial port rx interrupts during input overruns When a serial port gets faulty or gets flooded with inputs, its interrupt handler starts to work double time to get the characters to the workqueue for the tty layer to handle them. When this busy time on the serial/tty subsystem happens during boot, where it is also busy on the userspace trying to initialise, some processes can continuously get preempted and will be on hold until the interrupts subside. The fix is to backoff on processing received characters for a specified amount of time when an input overrun is seen (received a new character before the previous one is processed). This only stops receive and will continue to transmit characters to serial port. After the backoff period is done, it receive will be re-enabled. This is optional and will only be enabled by setting 'overrun-throttle-ms' in the dts. Signed-off-by: Darwin Dingel <darwin.dingel@alliedtelesis.co.nz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-10 11:29:09 +13:00
8250: three way resolve of the 8250 diffs This resolves the differences between the original 8250 patch, the revised 8250 patch and the independant clean up of the octeon driver (to use platform devices properly yay!) Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 17:06:20 +01:00
[SERIAL] Move serial8250_*_port prototypes to linux/serial_8250.h Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-01 15:56:26 +01:00
serial: 8250: introduce up_to_u8250p() helper It helps to cast struct uart_port to struct uart_8250_port at runtime. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-14 14:26:14 +03:00
tty/serial: make port of serial8250_register_8250_port const After the previous patch, we can make port passed to serial8250_find_match_or_unused const. And then we can make const also port of serial8250_register_8250_port. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210519072153.3859-2-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-19 09:21:51 +02:00
[SERIAL] Move serial8250_*_port prototypes to linux/serial_8250.h Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-09-01 15:56:26 +01:00
serial: Remove extern from func prototypes in headers Remove unnecessary externs from function prototypes in serial_8250.h and serial_core.h. Suggested-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230309080923.11778-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-09 10:09:18 +02:00
serial: add early_serial_setup() back to header file early_serial_setup was removed from serial.h, but forgot to put in serial_8250.h Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-18 00:49:10 -07:00
serial: Remove extern from func prototypes in headers Remove unnecessary externs from function prototypes in serial_8250.h and serial_core.h. Suggested-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230309080923.11778-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-09 10:09:18 +02:00
serial: remove quot_frac from serial8250_do_set_divisor() quot_frac is unused in serial8250_do_set_divisor() since commit b2b4b8ed3c06 (serial: 8250_exar: Move custom divisor support out from 8250_port). So no point to pass it. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20240805102046.307511-5-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-08-05 12:20:37 +02:00
serial: Remove extern from func prototypes in headers Remove unnecessary externs from function prototypes in serial_8250.h and serial_core.h. Suggested-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230309080923.11778-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-09 10:09:18 +02:00
serial: 8250: Add serial8250_handle_irq_locked() 8250_port exports serial8250_handle_irq() to HW specific 8250 drivers. It takes port's lock within but a HW specific 8250 driver may want to take port's lock itself, do something, and then call the generic handler in 8250_port but to do that, the caller has to release port's lock for no good reason. Introduce serial8250_handle_irq_locked() which a HW specific driver can call while already holding port's lock. As this is new export, put it straight into a namespace (where all 8250 exports should eventually be moved). Tested-by: Bandal, Shankar <shankar.bandal@intel.com> Tested-by: Murthy, Shanth <shanth.murthy@intel.com> Cc: stable <stable@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://patch.msgid.link/20260203171049.4353-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2026-02-03 19:10:45 +02:00
tty: serial8250: allow platforms to override irq handler Some ports (e.g. Synopsys DesignWare 8250) have special requirements for handling the interrupts. Allow these platforms to specify their own interrupt handler that will override the default. serial8250_handle_irq() is provided so that platforms can extend the IRQ handler rather than completely replacing it. Signed-off-by: Jamie Iles <jamie@jamieiles.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-15 10:17:52 +01:00
serial: 8250: make saved LSR larger DW flags address received as BIT(8) in LSR. In order to not lose that on read, enlarge lsr_saved_flags to u16. Adjust lsr/status variables and related call chains to use u16. Technically, some of these type conversion would not be needed but it doesn't hurt to be consistent. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220624204210.11112-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-24 23:42:05 +03:00
serial: export the key functions for an 8250 IRQ handler For drivers that need to construct their own IRQ handler, the three components are seen in the current handle_port -- i.e. Rx, Tx and modem_status. Make these exported symbols so that "almost" 8250 UARTs can construct their own IRQ handler with these shared components, while working around their own unique errata issues. The function names are given a serial8250 prefix, since they are now entering the global namespace. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-12-04 18:42:20 -05:00
serial: 8250: Split base port operations from universal driver Refactor base port operations into new file; 8250_port.c. Legacy irq handling, RSA port support, port storage for universal driver, driver definition, module parameters and linkage remain in 8250_core.c The source file split and resulting modules is diagrammed below: 8250_core.c ====> 8250_core.c __ \ \ \ +-- 8250.ko (alias 8250_core) \ 8250_pnp.c __/ (universal driver) \ => 8250_port.c __ \ +-- 8250_base.ko 8250_dma.c __/ (port operations) Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-27 09:19:00 -04:00
Revert "serial: 8250: Switch to nbcon console" This reverts commit b63e6f60eab45b16a1bf734fef9035a4c4187cd5. kernel test robot has found problems with this commit so revert it for now. Link: https://lore.kernel.org/r/202501221029.fb0d574d-lkp@intel.com Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202501221029.fb0d574d-lkp@intel.com Cc: John Ogness <john.ogness@linutronix.de> Cc: Petr Mladek <pmladek@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-01-22 10:35:56 +01:00
serial: 8250: Split base port operations from universal driver Refactor base port operations into new file; 8250_port.c. Legacy irq handling, RSA port support, port storage for universal driver, driver definition, module parameters and linkage remain in 8250_core.c The source file split and resulting modules is diagrammed below: 8250_core.c ====> 8250_core.c __ \ \ \ +-- 8250.ko (alias 8250_core) \ 8250_pnp.c __/ (universal driver) \ => 8250_port.c __ \ +-- 8250_base.ko 8250_dma.c __/ (port operations) Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-06-27 09:19:00 -04:00
serial: 8250_port: Don't use power management for kernel console Doing any kind of power management for kernel console is really bad idea. First of all, it runs in poll and atomic mode. This fact attaches a limitation on the functions that might be called. For example, pm_runtime_get_sync() might sleep and thus can't be used. This call needs, for example, to bring the device to powered on state on the system, where the power on sequence may require on-atomic operations, such as Intel Cherrytrail with ACPI enumerated UARTs. That said, on ACPI enabled platforms it might even call firmware for a job. On the other hand pm_runtime_get() doesn't guarantee that device will become powered on fast enough. Besides that, imagine the case when console is about to print a kernel Oops and it's powered off. In such an emergency case calling the complex functions is not the best what we can do, taking into consideration that user wants to see at least something of the last kernel word before it passes away. Here we modify the 8250 console code to prevent runtime power management. Note, there is a behaviour change for OMAP boards. It will require to detach kernel console to become idle. Link: https://lists.openwall.net/linux-kernel/2018/09/29/65 Suggested-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200217114016.49856-6-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-17 13:40:15 +02:00
serial: convert early_uart to earlycon for 8250 Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in serial initializing stage. the console_init=>serial8250_console_init=> register_console=>serial8250_console_setup will return -ENDEV, and console ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in drivers/serial/serial_core.c to call register_console to get console ttyS0. that is too late. Make early_uart to use early_param, so uart console can be used earlier. Make it to be bootconsole with CON_BOOT flag, so can use console handover feature. and it will switch to corresponding normal serial console automatically. new command line will be: console=uart8250,io,0x3f8,9600n8 console=uart8250,mmio,0xff5e0000,115200n8 or earlycon=uart8250,io,0x3f8,9600n8 earlycon=uart8250,mmio,0xff5e0000,115200n8 it will print in very early stage: Early serial console at I/O port 0x3f8 (options '9600n8') console [uart0] enabled later for console it will print: console handover: boot [uart0] -> real [ttyS0] Signed-off-by: <yinghai.lu@sun.com> Cc: Andi Kleen <ak@suse.de> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Gerd Hoffmann <kraxel@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-15 23:37:59 -07:00
serial: Remove extern from func prototypes in headers Remove unnecessary externs from function prototypes in serial_8250.h and serial_core.h. Suggested-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230309080923.11778-4-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-09 10:09:18 +02:00
serial: abstraction for 8250 legacy ports Not every platform that has generic legacy 8250 ports manages to have them clocked the right way or without errata. Provide a generic interface to allow platforms to override the default behaviour in a manner that dumps the complexity in *their* code not the 8250 driver. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-10-18 11:38:02 -07:00
serial: 8250: Move hp300_setup_serial_console() to <linux/serial_8250.h> If CONFIG_SERIAL_8250_HP300=y and CONFIG_SERIAL_8250_CONSOLE=y (e.g. m68k/allyesconfig): drivers/tty/serial/8250/8250_hp300.c:91:12: error: no previous prototype for ‘hp300_setup_serial_console’ [-Werror=missing-prototypes] 91 | int __init hp300_setup_serial_console(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ Fix this by moving the existing prototype in arch/m68k/hp300/config.c to <linux/serial_8250.h>, so it is visible to both caller and implementor. While at it, provide a dummy in case CONFIG_SERIAL_8250_CONSOLE is not enabled, to reduce #ifdef clutter in the caller. Exposed by commit 0fcb70851fbfea17 ("Makefile.extrawarn: turn on missing-prototypes globally"). Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/c17469f8e47b2ef49234a85a7a14882ddf374e41.1704892597.git.geert@linux-m68k.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-01-10 14:21:46 +01:00
tty: serial: 8250: 8250_port: Move prototypes to shared location Fixes the following W=1 kernel build warning(s): drivers/tty/serial/8250/8250_port.c:349:14: warning: no previous prototype for ‘au_serial_in’ [-Wmissing-prototypes] drivers/tty/serial/8250/8250_port.c:359:6: warning: no previous prototype for ‘au_serial_out’ [-Wmissing-prototypes] Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jirislaby@kernel.org> Cc: Mike Hudson <Exoray@isys.ca> Cc: linux-serial@vger.kernel.org Signed-off-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20201112105857.2078977-3-lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-12 10:58:55 +00:00
serial: 8250: RT288x/Au1xxx code away from core A non-trivial amount of RT288x/Au1xxx code is encapsulated into ifdeffery in 8250_port / 8250_early and some if UPIO_AU blocks. Create a separate file from them. Also handle errors properly in the cases where RT288x/Au1xxx code is not configured. It seems that 0x1000 mapsize is likely overkill but I've kept it the same as previously (the value was shrunk to that value in commit b2b13cdfd05e ("SERIAL 8250: Fixes for Alchemy UARTs.")). Seemingly, the driver only needs to access register at 0x28 for the divisor latch. The Kconfig side is a bit tricky. As SERIAL_8250_RT288X is bool it can only be =y. It is possible to have SERIAL_8250=m + SERIAL_8250_RT288X=y which required altering when 8250/ is included or the rt288x would not be built. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230511121029.13128-5-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11 15:10:27 +03:00
tty: serial: 8250: 8250_port: Move prototypes to shared location Fixes the following W=1 kernel build warning(s): drivers/tty/serial/8250/8250_port.c:349:14: warning: no previous prototype for ‘au_serial_in’ [-Wmissing-prototypes] drivers/tty/serial/8250/8250_port.c:359:6: warning: no previous prototype for ‘au_serial_out’ [-Wmissing-prototypes] Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jirislaby@kernel.org> Cc: Mike Hudson <Exoray@isys.ca> Cc: linux-serial@vger.kernel.org Signed-off-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20201112105857.2078977-3-lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-12 10:58:55 +00:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00