// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) Maxime Coquelin 2015 * Copyright (C) STMicroelectronics SA 2017 * Authors: Maxime Coquelin <[email protected]> * Gerald Baeza <[email protected]> * Erwan Le Ray <[email protected]> * * Inspired by st-asc.c from STMicroelectronics (c) */ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/console.h> #include <linux/delay.h> #include <linux/dma-direction.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/pm_wakeirq.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/spinlock.h> #include <linux/sysrq.h> #include <linux/tty_flip.h> #include <linux/tty.h> #include "serial_mctrl_gpio.h" #include "stm32-usart.h" /* Register offsets */ static struct stm32_usart_info __maybe_unused stm32f4_info = …; static struct stm32_usart_info __maybe_unused stm32f7_info = …; static struct stm32_usart_info __maybe_unused stm32h7_info = …; static void stm32_usart_stop_tx(struct uart_port *port); static void stm32_usart_transmit_chars(struct uart_port *port); static void __maybe_unused stm32_usart_console_putchar(struct uart_port *port, unsigned char ch); static inline struct stm32_port *to_stm32_port(struct uart_port *port) { … } static void stm32_usart_set_bits(struct uart_port *port, u32 reg, u32 bits) { … } static void stm32_usart_clr_bits(struct uart_port *port, u32 reg, u32 bits) { … } static unsigned int stm32_usart_tx_empty(struct uart_port *port) { … } static void stm32_usart_rs485_rts_enable(struct uart_port *port) { … } static void stm32_usart_rs485_rts_disable(struct uart_port *port) { … } static void stm32_usart_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE, u32 delay_DDE, u32 baud) { … } static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485conf) { … } static int stm32_usart_init_rs485(struct uart_port *port, struct platform_device *pdev) { … } static bool stm32_usart_rx_dma_started(struct stm32_port *stm32_port) { … } static void stm32_usart_rx_dma_terminate(struct stm32_port *stm32_port) { … } static int stm32_usart_dma_pause_resume(struct stm32_port *stm32_port, struct dma_chan *chan, enum dma_status expected_status, int dmaengine_pause_or_resume(struct dma_chan *), bool stm32_usart_xx_dma_started(struct stm32_port *), void stm32_usart_xx_dma_terminate(struct stm32_port *)) { … } static int stm32_usart_rx_dma_pause(struct stm32_port *stm32_port) { … } static int stm32_usart_rx_dma_resume(struct stm32_port *stm32_port) { … } /* Return true when data is pending (in pio mode), and false when no data is pending. */ static bool stm32_usart_pending_rx_pio(struct uart_port *port, u32 *sr) { … } static u8 stm32_usart_get_char_pio(struct uart_port *port) { … } static unsigned int stm32_usart_receive_chars_pio(struct uart_port *port) { … } static void stm32_usart_push_buffer_dma(struct uart_port *port, unsigned int dma_size) { … } static unsigned int stm32_usart_receive_chars_dma(struct uart_port *port) { … } static unsigned int stm32_usart_receive_chars(struct uart_port *port, bool force_dma_flush) { … } static void stm32_usart_rx_dma_complete(void *arg) { … } static int stm32_usart_rx_dma_start_or_resume(struct uart_port *port) { … } static void stm32_usart_tx_dma_terminate(struct stm32_port *stm32_port) { … } static bool stm32_usart_tx_dma_started(struct stm32_port *stm32_port) { … } static int stm32_usart_tx_dma_pause(struct stm32_port *stm32_port) { … } static int stm32_usart_tx_dma_resume(struct stm32_port *stm32_port) { … } static void stm32_usart_tx_dma_complete(void *arg) { … } static void stm32_usart_tx_interrupt_enable(struct uart_port *port) { … } static void stm32_usart_tc_interrupt_enable(struct uart_port *port) { … } static void stm32_usart_tx_interrupt_disable(struct uart_port *port) { … } static void stm32_usart_tc_interrupt_disable(struct uart_port *port) { … } static void stm32_usart_transmit_chars_pio(struct uart_port *port) { … } static void stm32_usart_transmit_chars_dma(struct uart_port *port) { … } static void stm32_usart_transmit_chars(struct uart_port *port) { … } static irqreturn_t stm32_usart_interrupt(int irq, void *ptr) { … } static void stm32_usart_set_mctrl(struct uart_port *port, unsigned int mctrl) { … } static unsigned int stm32_usart_get_mctrl(struct uart_port *port) { … } static void stm32_usart_enable_ms(struct uart_port *port) { … } static void stm32_usart_disable_ms(struct uart_port *port) { … } /* Transmit stop */ static void stm32_usart_stop_tx(struct uart_port *port) { … } /* There are probably characters waiting to be transmitted. */ static void stm32_usart_start_tx(struct uart_port *port) { … } /* Flush the transmit buffer. */ static void stm32_usart_flush_buffer(struct uart_port *port) { … } /* Throttle the remote when input buffer is about to overflow. */ static void stm32_usart_throttle(struct uart_port *port) { … } /* Unthrottle the remote, the input buffer can now accept data. */ static void stm32_usart_unthrottle(struct uart_port *port) { … } /* Receive stop */ static void stm32_usart_stop_rx(struct uart_port *port) { … } static void stm32_usart_break_ctl(struct uart_port *port, int break_state) { … } static int stm32_usart_startup(struct uart_port *port) { … } static void stm32_usart_shutdown(struct uart_port *port) { … } static const unsigned int stm32_usart_presc_val[] = …; static void stm32_usart_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { … } static const char *stm32_usart_type(struct uart_port *port) { … } static void stm32_usart_release_port(struct uart_port *port) { … } static int stm32_usart_request_port(struct uart_port *port) { … } static void stm32_usart_config_port(struct uart_port *port, int flags) { … } static int stm32_usart_verify_port(struct uart_port *port, struct serial_struct *ser) { … } static void stm32_usart_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) { … } #if defined(CONFIG_CONSOLE_POLL) /* Callbacks for characters polling in debug context (i.e. KGDB). */ static int stm32_usart_poll_init(struct uart_port *port) { … } static int stm32_usart_poll_get_char(struct uart_port *port) { … } static void stm32_usart_poll_put_char(struct uart_port *port, unsigned char ch) { … } #endif /* CONFIG_CONSOLE_POLL */ static const struct uart_ops stm32_uart_ops = …; struct stm32_usart_thresh_ratio { … }; static const struct stm32_usart_thresh_ratio stm32h7_usart_fifo_thresh_cfg[] = …; static int stm32_usart_get_thresh_value(u32 fifo_size, int index) { … } static int stm32_usart_get_ftcfg(struct platform_device *pdev, struct stm32_port *stm32port, const char *p, int *ftcfg) { … } static void stm32_usart_deinit_port(struct stm32_port *stm32port) { … } static const struct serial_rs485 stm32_rs485_supported = …; static int stm32_usart_init_port(struct stm32_port *stm32port, struct platform_device *pdev) { … } static struct stm32_port *stm32_usart_of_get_port(struct platform_device *pdev) { … } #ifdef CONFIG_OF static const struct of_device_id stm32_match[] = …; MODULE_DEVICE_TABLE(of, stm32_match); #endif static void stm32_usart_of_dma_rx_remove(struct stm32_port *stm32port, struct platform_device *pdev) { … } static int stm32_usart_of_dma_rx_probe(struct stm32_port *stm32port, struct platform_device *pdev) { … } static void stm32_usart_of_dma_tx_remove(struct stm32_port *stm32port, struct platform_device *pdev) { … } static int stm32_usart_of_dma_tx_probe(struct stm32_port *stm32port, struct platform_device *pdev) { … } static int stm32_usart_serial_probe(struct platform_device *pdev) { … } static void stm32_usart_serial_remove(struct platform_device *pdev) { … } static void __maybe_unused stm32_usart_console_putchar(struct uart_port *port, unsigned char ch) { … } #ifdef CONFIG_SERIAL_STM32_CONSOLE static void stm32_usart_console_write(struct console *co, const char *s, unsigned int cnt) { … } static int stm32_usart_console_setup(struct console *co, char *options) { … } static struct console stm32_console = …; #define STM32_SERIAL_CONSOLE … #else #define STM32_SERIAL_CONSOLE … #endif /* CONFIG_SERIAL_STM32_CONSOLE */ #ifdef CONFIG_SERIAL_EARLYCON static void early_stm32_usart_console_putchar(struct uart_port *port, unsigned char ch) { … } static void early_stm32_serial_write(struct console *console, const char *s, unsigned int count) { … } static int __init early_stm32_h7_serial_setup(struct earlycon_device *device, const char *options) { … } static int __init early_stm32_f7_serial_setup(struct earlycon_device *device, const char *options) { … } static int __init early_stm32_f4_serial_setup(struct earlycon_device *device, const char *options) { … } OF_EARLYCON_DECLARE(…); OF_EARLYCON_DECLARE(…); OF_EARLYCON_DECLARE(…); #endif /* CONFIG_SERIAL_EARLYCON */ static struct uart_driver stm32_usart_driver = …; static int __maybe_unused stm32_usart_serial_en_wakeup(struct uart_port *port, bool enable) { … } static int __maybe_unused stm32_usart_serial_suspend(struct device *dev) { … } static int __maybe_unused stm32_usart_serial_resume(struct device *dev) { … } static int __maybe_unused stm32_usart_runtime_suspend(struct device *dev) { … } static int __maybe_unused stm32_usart_runtime_resume(struct device *dev) { … } static const struct dev_pm_ops stm32_serial_pm_ops = …; static struct platform_driver stm32_serial_driver = …; static int __init stm32_usart_init(void) { … } static void __exit stm32_usart_exit(void) { … } module_init(…) …; module_exit(stm32_usart_exit); MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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