// SPDX-License-Identifier: GPL-2.0 /* * Sunplus SoC UART driver * * Author: Hammer Hsieh <[email protected]> * * Note1: This driver is 8250-like uart, but are not register compatible. * * Note2: On some buses, for preventing data incoherence, must do a read * for ensure write made it to hardware. In this driver, function startup * and shutdown did not do a read but only do a write directly. For what? * In Sunplus bus communication between memory bus and peripheral bus with * posted write, it will send a specific command after last write command * to make sure write done. Then memory bus identify the specific command * and send done signal back to master device. After master device received * done signal, then proceed next write command. It is no need to do a read * before write. */ #include <linux/clk.h> #include <linux/console.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/reset.h> #include <linux/serial_core.h> #include <linux/serial_reg.h> #include <linux/sysrq.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <asm/irq.h> /* Register offsets */ #define SUP_UART_DATA … #define SUP_UART_LSR … #define SUP_UART_MSR … #define SUP_UART_LCR … #define SUP_UART_MCR … #define SUP_UART_DIV_L … #define SUP_UART_DIV_H … #define SUP_UART_ISC … #define SUP_UART_TX_RESIDUE … #define SUP_UART_RX_RESIDUE … /* Line Status Register bits */ #define SUP_UART_LSR_BC … #define SUP_UART_LSR_FE … #define SUP_UART_LSR_OE … #define SUP_UART_LSR_PE … #define SUP_UART_LSR_RX … #define SUP_UART_LSR_TX … #define SUP_UART_LSR_TX_NOT_FULL … #define SUP_UART_LSR_BRK_ERROR_BITS … /* Line Control Register bits */ #define SUP_UART_LCR_SBC … /* Modem Control Register bits */ #define SUP_UART_MCR_RI … #define SUP_UART_MCR_DCD … /* Interrupt Status/Control Register bits */ #define SUP_UART_ISC_RXM … #define SUP_UART_ISC_TXM … #define SUP_UART_ISC_RX … #define SUP_UART_ISC_TX … #define SUP_DUMMY_READ … #define SUP_UART_NR … struct sunplus_uart_port { … }; static void sp_uart_put_char(struct uart_port *port, unsigned int ch) { … } static u32 sunplus_tx_buf_not_full(struct uart_port *port) { … } static unsigned int sunplus_tx_empty(struct uart_port *port) { … } static void sunplus_set_mctrl(struct uart_port *port, unsigned int mctrl) { … } static unsigned int sunplus_get_mctrl(struct uart_port *port) { … } static void sunplus_stop_tx(struct uart_port *port) { … } static void sunplus_start_tx(struct uart_port *port) { … } static void sunplus_stop_rx(struct uart_port *port) { … } static void sunplus_break_ctl(struct uart_port *port, int ctl) { … } static void transmit_chars(struct uart_port *port) { … } static void receive_chars(struct uart_port *port) { … } static irqreturn_t sunplus_uart_irq(int irq, void *args) { … } static int sunplus_startup(struct uart_port *port) { … } static void sunplus_shutdown(struct uart_port *port) { … } static void sunplus_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *oldtermios) { … } static void sunplus_set_ldisc(struct uart_port *port, struct ktermios *termios) { … } static const char *sunplus_type(struct uart_port *port) { … } static void sunplus_config_port(struct uart_port *port, int type) { … } static int sunplus_verify_port(struct uart_port *port, struct serial_struct *ser) { … } #if defined(CONFIG_SERIAL_SUNPLUS_CONSOLE) || defined(CONFIG_CONSOLE_POLL) static void wait_for_xmitr(struct uart_port *port) { … } #endif #ifdef CONFIG_CONSOLE_POLL static void sunplus_poll_put_char(struct uart_port *port, unsigned char data) { … } static int sunplus_poll_get_char(struct uart_port *port) { … } #endif static const struct uart_ops sunplus_uart_ops = …; #ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE static struct sunplus_uart_port *sunplus_console_ports[SUP_UART_NR]; static void sunplus_uart_console_putchar(struct uart_port *port, unsigned char ch) { … } static void sunplus_console_write(struct console *co, const char *s, unsigned int count) { … } static int __init sunplus_console_setup(struct console *co, char *options) { … } static struct uart_driver sunplus_uart_driver; static struct console sunplus_uart_console = …; #define SERIAL_SUNPLUS_CONSOLE … #else #define SERIAL_SUNPLUS_CONSOLE … #endif static struct uart_driver sunplus_uart_driver = …; static void sunplus_uart_disable_unprepare(void *data) { … } static void sunplus_uart_reset_control_assert(void *data) { … } static int sunplus_uart_probe(struct platform_device *pdev) { … } static void sunplus_uart_remove(struct platform_device *pdev) { … } static int __maybe_unused sunplus_uart_suspend(struct device *dev) { … } static int __maybe_unused sunplus_uart_resume(struct device *dev) { … } static const struct dev_pm_ops sunplus_uart_pm_ops = …; static const struct of_device_id sp_uart_of_match[] = …; MODULE_DEVICE_TABLE(of, sp_uart_of_match); static struct platform_driver sunplus_uart_platform_driver = …; static int __init sunplus_uart_init(void) { … } module_init(…) …; static void __exit sunplus_uart_exit(void) { … } module_exit(sunplus_uart_exit); #ifdef CONFIG_SERIAL_EARLYCON static void sunplus_uart_putc(struct uart_port *port, unsigned char c) { … } static void sunplus_uart_early_write(struct console *con, const char *s, unsigned int n) { … } static int __init sunplus_uart_early_setup(struct earlycon_device *dev, const char *opt) { … } OF_EARLYCON_DECLARE(…); #endif MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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