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linux/drivers/tty/serial/liteuart.c

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drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: use bit number macros Replace magic bit constants (e.g., 1, 2, 4) with BIT(x) expressions. 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/20221123130500.1030189-3-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-23 08:04:48 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
tty: Explicitly include correct DT includes The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # for imx Link: https://lore.kernel.org/r/20230724205440.767071-1-robh@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-07-24 14:54:38 -06:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: use bit number macros Replace magic bit constants (e.g., 1, 2, 4) with BIT(x) expressions. 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/20221123130500.1030189-3-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-23 08:04:48 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: use KBUILD_MODNAME as driver name Replace hard-coded instances of "liteuart" with KBUILD_MODNAME. 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/20221123130500.1030189-2-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-23 08:04:47 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the TX path 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>
2022-11-23 08:04:59 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the TX path 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>
2022-11-23 08:04:59 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: move function definitions 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>
2022-11-23 08:04:57 -05:00
serial: liteuart: add IRQ support for the TX path 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>
2022-11-23 08:04:59 -05:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: add IRQ support for the TX path 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>
2022-11-23 08:04:59 -05:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: move function definitions 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>
2022-11-23 08:04:57 -05:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: move function definitions 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>
2022-11-23 08:04:57 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
serial: liteuart: add IRQ support for the RX path 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>
2022-11-23 08:04:58 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +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
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Don't mix devm_*() with non-devm_*() calls In the probe we need to call all devm_*() first followed by non-devm_*() calls. This is due to reversed clean up that may happen in a wrong order otherwise. The driver currently allocates xarray before calling devm_platform_get_and_ioremap_resource(). While it's not an issue in this certain case, it's still better to be pedantic. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Gabriel Somlo <somlo@cmu.edu> Link: https://lore.kernel.org/r/20230123191741.79751-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-23 21:17:41 +02:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Fix NULL pointer dereference in ->remove() drvdata has to be set in _probe() - otherwise platform_get_drvdata() causes null pointer dereference BUG in _remove(). Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver") Cc: stable <stable@vger.kernel.org> Reviewed-by: Johan Hovold <johan@kernel.org> Signed-off-by: Ilia Sergachev <silia@ethz.ch> Link: https://lore.kernel.org/r/20211115224944.23f8c12b@dtkw Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-11-15 22:49:44 +01:00
serial: liteuart: fix minor-number leak on probe errors Make sure to release the allocated minor number before returning on probe errors. Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver") Cc: stable@vger.kernel.org # 5.11 Cc: Filip Kokosinski <fkokosinski@antmicro.com> Cc: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Stafford Horne <shorne@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20211117100512.5058-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-11-17 11:05:11 +01:00
serial: liteuart: Remove a copy of UART id in private structure The struct liteuart_port keeps tracking of UART ID which is also saved in the struct uart_port as line member. Drop the former one and use the latter everywhere. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Gabriel Somlo <gsomlo@gmail.com> Link: https://lore.kernel.org/r/20230123192604.81452-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-23 21:26:04 +02:00
serial: liteuart: fix minor-number leak on probe errors Make sure to release the allocated minor number before returning on probe errors. Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver") Cc: stable@vger.kernel.org # 5.11 Cc: Filip Kokosinski <fkokosinski@antmicro.com> Cc: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Stafford Horne <shorne@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20211117100512.5058-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-11-17 11:05:11 +01:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Convert to platform remove callback returning void The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Link: https://lore.kernel.org/r/20231110152927.70601-20-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-11-10 16:29:47 +01:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Remove a copy of UART id in private structure The struct liteuart_port keeps tracking of UART ID which is also saved in the struct uart_port as line member. Drop the former one and use the latter everywhere. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Gabriel Somlo <gsomlo@gmail.com> Link: https://lore.kernel.org/r/20230123192604.81452-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-23 21:26:04 +02:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: fix use-after-free and memleak on unbind Deregister the port when unbinding the driver to prevent it from being used after releasing the driver data and leaking memory allocated by serial core. Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver") Cc: stable@vger.kernel.org # 5.11 Cc: Filip Kokosinski <fkokosinski@antmicro.com> Cc: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Stafford Horne <shorne@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20211117100512.5058-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-11-17 11:05:10 +01:00
serial: liteuart: Remove a copy of UART id in private structure The struct liteuart_port keeps tracking of UART ID which is also saved in the struct uart_port as line member. Drop the former one and use the latter everywhere. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Gabriel Somlo <gsomlo@gmail.com> Link: https://lore.kernel.org/r/20230123192604.81452-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-23 21:26:04 +02:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: Switch back to struct platform_driver::remove() After commit 0edb555a65d1 ("platform: Make platform_driver::remove() return void") .remove() is (again) the right callback to implement for platform drivers. Convert all platform drivers below drivers/tty/serial to use .remove(), with the eventual goal to drop struct platform_driver::remove_new(). As .remove() and .remove_new() have the same prototypes, conversion is done by just changing the structure member name in the driver initializer. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://lore.kernel.org/r/20241007205803.444994-7-u.kleine-koenig@baylibre.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-10-07 22:58:04 +02:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: use KBUILD_MODNAME as driver name Replace hard-coded instances of "liteuart" with KBUILD_MODNAME. 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/20221123130500.1030189-2-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-23 08:04:47 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: move polling putchar() function 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>
2022-11-23 08:05:00 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Use port lock wrappers When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Gabriel Somlo <gsomlo@gmail.com> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-33-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-14 20:43:49 +02:06
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: use KBUILD_MODNAME as driver name Replace hard-coded instances of "liteuart" with KBUILD_MODNAME. 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/20221123130500.1030189-2-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-23 08:04:47 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: Add support for earlycon Most litex boards using RISC-V soft cores us the sbi earlycon, however this is not available for non RISC-V litex SoC's. This patch enables earlycon for liteuart which is available on all Litex SoC's making support for earycon debugging more widely available. Cc: Florent Kermarrec <florent@enjoy-digital.fr> Cc: Mateusz Holenko <mholenko@antmicro.com> Cc: Joel Stanley <joel@jms.id.au> Cc: Gabriel L. Somlo <gsomlo@gmail.com> Reviewed-and-tested-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Reviewed-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Stafford Horne <shorne@gmail.com> Link: https://lore.kernel.org/r/20210517115453.24365-1-shorne@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-17 20:54:52 +09:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: minor style fix in liteuart_init() 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>
2022-11-23 08:04:51 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: minor style fix in liteuart_init() 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>
2022-11-23 08:04:51 -05:00
drivers/tty/serial: add LiteUART driver This commit adds driver for the FPGA-based LiteUART serial controller from LiteX SoC builder. The current implementation supports LiteUART configured for 32 bit data width and 8 bit CSR bus width. It does not support IRQ. Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com> Signed-off-by: Mateusz Holenko <mholenko@antmicro.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com>
2020-10-13 16:46:21 +02:00
serial: liteuart: fix MODULE_ALIAS modprobe can't handle spaces in aliases. Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver") Signed-off-by: Alyssa Ross <hi@alyssa.is> Link: https://lore.kernel.org/r/20220104131030.1674733-1-hi@alyssa.is Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-04 13:10:28 +00:00