// SPDX-License-Identifier: GPL-2.0+ /* * Driver for Conexant Digicolor serial ports (USART) * * Author: Baruch Siach <[email protected]> * * Copyright (C) 2014 Paradox Innovation Ltd. */ #include <linux/module.h> #include <linux/console.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/workqueue.h> #define UA_ENABLE … #define UA_ENABLE_ENABLE … #define UA_CONTROL … #define UA_CONTROL_RX_ENABLE … #define UA_CONTROL_TX_ENABLE … #define UA_CONTROL_SOFT_RESET … #define UA_STATUS … #define UA_STATUS_PARITY_ERR … #define UA_STATUS_FRAME_ERR … #define UA_STATUS_OVERRUN_ERR … #define UA_STATUS_TX_READY … #define UA_CONFIG … #define UA_CONFIG_CHAR_LEN … #define UA_CONFIG_STOP_BITS … #define UA_CONFIG_PARITY … #define UA_CONFIG_ODD_PARITY … #define UA_EMI_REC … #define UA_HBAUD_LO … #define UA_HBAUD_HI … #define UA_STATUS_FIFO … #define UA_STATUS_FIFO_RX_EMPTY … #define UA_STATUS_FIFO_RX_INT_ALMOST … #define UA_STATUS_FIFO_TX_FULL … #define UA_STATUS_FIFO_TX_INT_ALMOST … #define UA_CONFIG_FIFO … #define UA_CONFIG_FIFO_RX_THRESH … #define UA_CONFIG_FIFO_RX_FIFO_MODE … #define UA_CONFIG_FIFO_TX_FIFO_MODE … #define UA_INTFLAG_CLEAR … #define UA_INTFLAG_SET … #define UA_INT_ENABLE … #define UA_INT_STATUS … #define UA_INT_TX … #define UA_INT_RX … #define DIGICOLOR_USART_NR … /* * We use the 16 bytes hardware FIFO to buffer Rx traffic. Rx interrupt is * only produced when the FIFO is filled more than a certain configurable * threshold. Unfortunately, there is no way to set this threshold below half * FIFO. This means that we must periodically poll the FIFO status register to * see whether there are waiting Rx bytes. */ struct digicolor_port { … }; static struct uart_port *digicolor_ports[DIGICOLOR_USART_NR]; static bool digicolor_uart_tx_full(struct uart_port *port) { … } static bool digicolor_uart_rx_empty(struct uart_port *port) { … } static void digicolor_uart_stop_tx(struct uart_port *port) { … } static void digicolor_uart_start_tx(struct uart_port *port) { … } static void digicolor_uart_stop_rx(struct uart_port *port) { … } static void digicolor_rx_poll(struct work_struct *work) { … } static void digicolor_uart_rx(struct uart_port *port) { … } static void digicolor_uart_tx(struct uart_port *port) { … } static irqreturn_t digicolor_uart_int(int irq, void *dev_id) { … } static unsigned int digicolor_uart_tx_empty(struct uart_port *port) { … } static unsigned int digicolor_uart_get_mctrl(struct uart_port *port) { … } static void digicolor_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) { … } static void digicolor_uart_break_ctl(struct uart_port *port, int state) { … } static int digicolor_uart_startup(struct uart_port *port) { … } static void digicolor_uart_shutdown(struct uart_port *port) { … } static void digicolor_uart_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { … } static const char *digicolor_uart_type(struct uart_port *port) { … } static void digicolor_uart_config_port(struct uart_port *port, int flags) { … } static void digicolor_uart_release_port(struct uart_port *port) { … } static int digicolor_uart_request_port(struct uart_port *port) { … } static const struct uart_ops digicolor_uart_ops = …; static void digicolor_uart_console_putchar(struct uart_port *port, unsigned char ch) { … } static void digicolor_uart_console_write(struct console *co, const char *c, unsigned n) { … } static int digicolor_uart_console_setup(struct console *co, char *options) { … } static struct console digicolor_console = …; static struct uart_driver digicolor_uart = …; static int digicolor_uart_probe(struct platform_device *pdev) { … } static void digicolor_uart_remove(struct platform_device *pdev) { … } static const struct of_device_id digicolor_uart_dt_ids[] = …; MODULE_DEVICE_TABLE(of, digicolor_uart_dt_ids); static struct platform_driver digicolor_uart_platform = …; static int __init digicolor_uart_init(void) { … } module_init(…) …; static void __exit digicolor_uart_exit(void) { … } module_exit(digicolor_uart_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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