// SPDX-License-Identifier: GPL-2.0 /* * Derived from many drivers using generic_serial interface. * * Copyright (C) 2008 Maxime Bizon <[email protected]> * * Serial driver for BCM63xx integrated UART. * * Hardware flow control was _not_ tested since I only have RX/TX on * my board. */ #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/module.h> #include <linux/console.h> #include <linux/clk.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/sysrq.h> #include <linux/serial.h> #include <linux/serial_core.h> #include <linux/serial_bcm63xx.h> #include <linux/io.h> #include <linux/of.h> #define BCM63XX_NR_UARTS … static struct uart_port ports[BCM63XX_NR_UARTS]; /* * rx interrupt mask / stat * * mask: * - rx fifo full * - rx fifo above threshold * - rx fifo not empty for too long */ #define UART_RX_INT_MASK … #define UART_RX_INT_STAT … /* * tx interrupt mask / stat * * mask: * - tx fifo empty * - tx fifo below threshold */ #define UART_TX_INT_MASK … #define UART_TX_INT_STAT … /* * external input interrupt * * mask: any edge on CTS, DCD */ #define UART_EXTINP_INT_MASK … /* * handy uart register accessor */ static inline unsigned int bcm_uart_readl(struct uart_port *port, unsigned int offset) { … } static inline void bcm_uart_writel(struct uart_port *port, unsigned int value, unsigned int offset) { … } /* * serial core request to check if uart tx fifo is empty */ static unsigned int bcm_uart_tx_empty(struct uart_port *port) { … } /* * serial core request to set RTS and DTR pin state and loopback mode */ static void bcm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) { … } /* * serial core request to return RI, CTS, DCD and DSR pin state */ static unsigned int bcm_uart_get_mctrl(struct uart_port *port) { … } /* * serial core request to disable tx ASAP (used for flow control) */ static void bcm_uart_stop_tx(struct uart_port *port) { … } /* * serial core request to (re)enable tx */ static void bcm_uart_start_tx(struct uart_port *port) { … } /* * serial core request to stop rx, called before port shutdown */ static void bcm_uart_stop_rx(struct uart_port *port) { … } /* * serial core request to enable modem status interrupt reporting */ static void bcm_uart_enable_ms(struct uart_port *port) { … } /* * serial core request to start/stop emitting break char */ static void bcm_uart_break_ctl(struct uart_port *port, int ctl) { … } /* * return port type in string format */ static const char *bcm_uart_type(struct uart_port *port) { … } /* * read all chars in rx fifo and send them to core */ static void bcm_uart_do_rx(struct uart_port *port) { … } /* * fill tx fifo with chars to send, stop when fifo is about to be full * or when all chars have been sent. */ static void bcm_uart_do_tx(struct uart_port *port) { … } /* * process uart interrupt */ static irqreturn_t bcm_uart_interrupt(int irq, void *dev_id) { … } /* * enable rx & tx operation on uart */ static void bcm_uart_enable(struct uart_port *port) { … } /* * disable rx & tx operation on uart */ static void bcm_uart_disable(struct uart_port *port) { … } /* * clear all unread data in rx fifo and unsent data in tx fifo */ static void bcm_uart_flush(struct uart_port *port) { … } /* * serial core request to initialize uart and start rx operation */ static int bcm_uart_startup(struct uart_port *port) { … } /* * serial core request to flush & disable uart */ static void bcm_uart_shutdown(struct uart_port *port) { … } /* * serial core request to change current uart setting */ static void bcm_uart_set_termios(struct uart_port *port, struct ktermios *new, const struct ktermios *old) { … } /* * serial core request to claim uart iomem */ static int bcm_uart_request_port(struct uart_port *port) { … } /* * serial core request to release uart iomem */ static void bcm_uart_release_port(struct uart_port *port) { … } /* * serial core request to do any port required autoconfiguration */ static void bcm_uart_config_port(struct uart_port *port, int flags) { … } /* * serial core request to check that port information in serinfo are * suitable */ static int bcm_uart_verify_port(struct uart_port *port, struct serial_struct *serinfo) { … } #ifdef CONFIG_CONSOLE_POLL /* * return true when outstanding tx equals fifo size */ static bool bcm_uart_tx_full(struct uart_port *port) { … } static int bcm_uart_poll_get_char(struct uart_port *port) { … } static void bcm_uart_poll_put_char(struct uart_port *port, unsigned char c) { … } #endif /* serial core callbacks */ static const struct uart_ops bcm_uart_ops = …; #ifdef CONFIG_SERIAL_BCM63XX_CONSOLE static void wait_for_xmitr(struct uart_port *port) { … } /* * output given char */ static void bcm_console_putchar(struct uart_port *port, unsigned char ch) { … } /* * console core request to output given string */ static void bcm_console_write(struct console *co, const char *s, unsigned int count) { … } /* * console core request to setup given console, find matching uart * port and setup it. */ static int bcm_console_setup(struct console *co, char *options) { … } static struct uart_driver bcm_uart_driver; static struct console bcm63xx_console = …; static int __init bcm63xx_console_init(void) { … } console_initcall(bcm63xx_console_init); static void bcm_early_write(struct console *con, const char *s, unsigned n) { … } static int __init bcm_early_console_setup(struct earlycon_device *device, const char *opt) { … } OF_EARLYCON_DECLARE(…); #define BCM63XX_CONSOLE … #else #define BCM63XX_CONSOLE … #endif /* CONFIG_SERIAL_BCM63XX_CONSOLE */ static struct uart_driver bcm_uart_driver = …; /* * platform driver probe/remove callback */ static int bcm_uart_probe(struct platform_device *pdev) { … } static void bcm_uart_remove(struct platform_device *pdev) { … } static const struct of_device_id bcm63xx_of_match[] = …; MODULE_DEVICE_TABLE(of, bcm63xx_of_match); /* * platform driver stuff */ static struct platform_driver bcm_uart_platform_driver = …; static int __init bcm_uart_init(void) { … } static void __exit bcm_uart_exit(void) { … } module_init(…) …; module_exit(bcm_uart_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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