diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/serial/ar933x_uart.c | 678 |
1 files changed, 0 insertions, 678 deletions
diff --git a/target/linux/ar71xx/files/drivers/serial/ar933x_uart.c b/target/linux/ar71xx/files/drivers/serial/ar933x_uart.c deleted file mode 100644 index ea12e405cb..0000000000 --- a/target/linux/ar71xx/files/drivers/serial/ar933x_uart.c +++ /dev/null @@ -1,678 +0,0 @@ -/* - * Atheros AR933X SoC built-in UART driver - * - * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> - * - * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/sysrq.h> -#include <linux/delay.h> -#include <linux/platform_device.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> -#include <linux/serial.h> -#include <linux/slab.h> -#include <linux/io.h> -#include <linux/irq.h> - -#include <asm/mach-ar71xx/ar933x_uart.h> -#include <asm/mach-ar71xx/ar933x_uart_platform.h> - -#define DRIVER_NAME "ar933x-uart" - -#define AR933X_DUMMY_STATUS_RD 0x01 - -static struct uart_driver ar933x_uart_driver; - -struct ar933x_uart_port { - struct uart_port port; - unsigned int ier; /* shadow Interrupt Enable Register */ -}; - -static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up, - int offset) -{ - return readl(up->port.membase + offset); -} - -static inline void ar933x_uart_write(struct ar933x_uart_port *up, - int offset, unsigned int value) -{ - writel(value, up->port.membase + offset); -} - -static inline void ar933x_uart_rmw(struct ar933x_uart_port *up, - unsigned int offset, - unsigned int mask, - unsigned int val) -{ - unsigned int t; - - t = ar933x_uart_read(up, offset); - t &= ~mask; - t |= val; - ar933x_uart_write(up, offset, t); -} - -static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up, - unsigned int offset, - unsigned int val) -{ - ar933x_uart_rmw(up, offset, 0, val); -} - -static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up, - unsigned int offset, - unsigned int val) -{ - ar933x_uart_rmw(up, offset, val, 0); -} - -static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up) -{ - up->ier |= AR933X_UART_INT_TX_EMPTY; - ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); -} - -static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up) -{ - up->ier &= ~AR933X_UART_INT_TX_EMPTY; - ar933x_uart_write(up, AR933X_UART_INT_EN_REG,up->ier); -} - -static inline void ar933x_uart_putc(struct ar933x_uart_port *up, int ch) -{ - unsigned int rdata; - - rdata = ch & AR933X_UART_DATA_TX_RX_MASK; - rdata |= AR933X_UART_DATA_TX_CSR; - ar933x_uart_write(up, AR933X_UART_DATA_REG, rdata); -} - -static unsigned int ar933x_uart_tx_empty(struct uart_port *port) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - unsigned long flags; - unsigned int rdata; - - spin_lock_irqsave(&up->port.lock, flags); - rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); - spin_unlock_irqrestore(&up->port.lock, flags); - - return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT; -} - -static unsigned int ar933x_uart_get_mctrl(struct uart_port *port) -{ - return TIOCM_CAR; -} - -static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ -} - -static void ar933x_uart_start_tx(struct uart_port *port) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - - ar933x_uart_start_tx_interrupt(up); -} - -static void ar933x_uart_stop_tx(struct uart_port *port) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - - ar933x_uart_stop_tx_interrupt(up); -} - -static void ar933x_uart_stop_rx(struct uart_port *port) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - - up->ier &= ~AR933X_UART_INT_RX_VALID; - ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); -} - -static void ar933x_uart_break_ctl(struct uart_port *port, int break_state) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - unsigned long flags; - - spin_lock_irqsave(&up->port.lock, flags); - if (break_state == -1) - ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, - AR933X_UART_CS_TX_BREAK); - else - ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, - AR933X_UART_CS_TX_BREAK); - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static void ar933x_uart_enable_ms(struct uart_port *port) -{ -} - -static void ar933x_uart_set_termios(struct uart_port *port, - struct ktermios *new, - struct ktermios *old) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - unsigned int cs; - unsigned long flags; - unsigned int baud, scale; - - /* Only CS8 is supported */ - new->c_cflag &= ~CSIZE; - new->c_cflag |= CS8; - - /* Only one stop bit is supported */ - new->c_cflag &= ~CSTOPB; - - cs = 0; - if (new->c_cflag & PARENB) { - if (!(new->c_cflag & PARODD)) - cs |= AR933X_UART_CS_PARITY_EVEN; - else - cs |= AR933X_UART_CS_PARITY_ODD; - } else { - cs |= AR933X_UART_CS_PARITY_NONE; - } - - /* Mark/space parity is not supported */ - new->c_cflag &= ~CMSPAR; - - baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16); - scale = (port->uartclk / (16 * baud)) - 1; - - /* - * Ok, we're now changing the port state. Do it with - * interrupts disabled. - */ - spin_lock_irqsave(&up->port.lock, flags); - - /* Update the per-port timeout. */ - uart_update_timeout(port, new->c_cflag, baud); - - up->port.ignore_status_mask = 0; - - /* ignore all characters if CREAD is not set */ - if ((new->c_cflag & CREAD) == 0) - up->port.ignore_status_mask |= AR933X_DUMMY_STATUS_RD; - - ar933x_uart_write(up, AR933X_UART_CLOCK_REG, - scale << AR933X_UART_CLOCK_SCALE_S | 8192); - - /* setup configuration register */ - ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_PARITY_M, cs); - - /* enable host interrupt */ - ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, - AR933X_UART_CS_HOST_INT_EN); - - spin_unlock_irqrestore(&up->port.lock, flags); - - if (tty_termios_baud_rate(new)) - tty_termios_encode_baud_rate(new, baud, baud); -} - -static void ar933x_uart_rx_chars(struct ar933x_uart_port *up) -{ - struct tty_struct *tty = up->port.state->port.tty; - int max_count = 256; - - do { - unsigned int rdata; - unsigned char ch; - - rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); - if ((rdata & AR933X_UART_DATA_RX_CSR) == 0) - break; - - /* remove the character from the FIFO */ - ar933x_uart_write(up, AR933X_UART_DATA_REG, - AR933X_UART_DATA_RX_CSR); - - up->port.icount.rx++; - ch = rdata & AR933X_UART_DATA_TX_RX_MASK; - - if (uart_handle_sysrq_char(&up->port, ch)) - continue; - - if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0) - tty_insert_flip_char(tty, ch, TTY_NORMAL); - } while (max_count-- > 0); - - tty_flip_buffer_push(tty); -} - -static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) -{ - struct circ_buf *xmit = &up->port.state->xmit; - int count; - - if (uart_tx_stopped(&up->port)) - return; - - count = up->port.fifosize; - do { - unsigned int rdata; - - rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); - if ((rdata & AR933X_UART_DATA_TX_CSR) == 0) - break; - - if (up->port.x_char) { - ar933x_uart_putc(up, up->port.x_char); - up->port.icount.tx++; - up->port.x_char = 0; - continue; - } - - if (uart_circ_empty(xmit)) - break; - - ar933x_uart_putc(up, xmit->buf[xmit->tail]); - - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - up->port.icount.tx++; - } while (--count > 0); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&up->port); - - if (!uart_circ_empty(xmit)) - ar933x_uart_start_tx_interrupt(up); -} - -static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id) -{ - struct ar933x_uart_port *up = dev_id; - unsigned int status; - - status = ar933x_uart_read(up, AR933X_UART_CS_REG); - if ((status & AR933X_UART_CS_HOST_INT) == 0) - return IRQ_NONE; - - spin_lock(&up->port.lock); - - status = ar933x_uart_read(up, AR933X_UART_INT_REG); - status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG); - - if (status & AR933X_UART_INT_RX_VALID) { - ar933x_uart_write(up, AR933X_UART_INT_REG, - AR933X_UART_INT_RX_VALID); - ar933x_uart_rx_chars(up); - } - - if (status & AR933X_UART_INT_TX_EMPTY) { - ar933x_uart_write(up, AR933X_UART_INT_REG, - AR933X_UART_INT_TX_EMPTY); - ar933x_uart_stop_tx_interrupt(up); - ar933x_uart_tx_chars(up); - } - - spin_unlock(&up->port.lock); - - return IRQ_HANDLED; -} - -static int ar933x_uart_startup(struct uart_port *port) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - unsigned long flags; - int ret; - - ret = request_irq(up->port.irq, ar933x_uart_interrupt, - up->port.irqflags, dev_name(up->port.dev), up); - if (ret) - return ret; - - spin_lock_irqsave(&up->port.lock, flags); - - /* Enable HOST interrupts */ - ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, - AR933X_UART_CS_HOST_INT_EN); - - /* Enable RX interrupts */ - up->ier = AR933X_UART_INT_RX_VALID; - ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); - - spin_unlock_irqrestore(&up->port.lock, flags); - - return 0; -} - -static void ar933x_uart_shutdown(struct uart_port *port) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - - /* Disable all interrupts */ - up->ier = 0; - ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); - - /* Disable break condition */ - ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, - AR933X_UART_CS_TX_BREAK); - - free_irq(up->port.irq, up); -} - -static const char *ar933x_uart_type(struct uart_port *port) -{ - return (port->type == PORT_AR933X) ? "AR933X UART" : NULL; -} - -static void ar933x_uart_release_port(struct uart_port *port) -{ - /* Nothing to release ... */ -} - -static int ar933x_uart_request_port(struct uart_port *port) -{ - /* UARTs always present */ - return 0; -} - -static void ar933x_uart_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) - port->type = PORT_AR933X; -} - -static int ar933x_uart_verify_port(struct uart_port *port, - struct serial_struct *ser) -{ - if (ser->type != PORT_UNKNOWN && - ser->type != PORT_AR933X) - return -EINVAL; - - if (ser->irq < 0 || ser->irq >= NR_IRQS) - return -EINVAL; - - if (ser->baud_base < 28800) - return -EINVAL; - - return 0; -} - -static struct uart_ops ar933x_uart_ops = { - .tx_empty = ar933x_uart_tx_empty, - .set_mctrl = ar933x_uart_set_mctrl, - .get_mctrl = ar933x_uart_get_mctrl, - .stop_tx = ar933x_uart_stop_tx, - .start_tx = ar933x_uart_start_tx, - .stop_rx = ar933x_uart_stop_rx, - .enable_ms = ar933x_uart_enable_ms, - .break_ctl = ar933x_uart_break_ctl, - .startup = ar933x_uart_startup, - .shutdown = ar933x_uart_shutdown, - .set_termios = ar933x_uart_set_termios, - .type = ar933x_uart_type, - .release_port = ar933x_uart_release_port, - .request_port = ar933x_uart_request_port, - .config_port = ar933x_uart_config_port, - .verify_port = ar933x_uart_verify_port, -}; - -#ifdef CONFIG_SERIAL_AR933X_CONSOLE - -static struct ar933x_uart_port *ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS]; - -static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up) -{ - unsigned int status; - unsigned int timeout = 60000; - - /* Wait up to 60ms for the character(s) to be sent. */ - do { - status = ar933x_uart_read(up, AR933X_UART_DATA_REG); - if (--timeout == 0) - break; - udelay(1); - } while ((status & AR933X_UART_DATA_TX_CSR) == 0); -} - -static void ar933x_uart_console_putchar(struct uart_port *port, int ch) -{ - struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; - - ar933x_uart_wait_xmitr(up); - ar933x_uart_putc(up, ch); -} - -static void ar933x_uart_console_write(struct console *co, const char *s, - unsigned int count) -{ - struct ar933x_uart_port *up = ar933x_console_ports[co->index]; - unsigned long flags; - unsigned int int_en; - int locked = 1; - - local_irq_save(flags); - - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) - locked = spin_trylock(&up->port.lock); - else - spin_lock(&up->port.lock); - - /* - * First save the IER then disable the interrupts - */ - int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG); - ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0); - - uart_console_write(&up->port, s, count, ar933x_uart_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore the IER - */ - ar933x_uart_wait_xmitr(up); - ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en); - - ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS); - - if (locked) - spin_unlock(&up->port.lock); - - local_irq_restore(flags); -} - -static int ar933x_uart_console_setup(struct console *co, char *options) -{ - struct ar933x_uart_port *up; - int baud = 115200; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS) - return -EINVAL; - - up = ar933x_console_ports[co->index]; - if (!up) - return -ENODEV; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - - return uart_set_options(&up->port, co, baud, parity, bits, flow); -} - -static struct console ar933x_uart_console = { - .name = "ttyATH", - .write = ar933x_uart_console_write, - .device = uart_console_device, - .setup = ar933x_uart_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &ar933x_uart_driver, -}; - -static void ar933x_uart_add_console_port(struct ar933x_uart_port *up) -{ - ar933x_console_ports[up->port.line] = up; -} - -#define AR933X_SERIAL_CONSOLE &ar933x_uart_console - -#else - -static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {} - -#define AR933X_SERIAL_CONSOLE NULL - -#endif /* CONFIG_SERIAL_AR933X_CONSOLE */ - -static struct uart_driver ar933x_uart_driver = { - .owner = THIS_MODULE, - .driver_name = DRIVER_NAME, - .dev_name = "ttyATH", - .nr = CONFIG_SERIAL_AR933X_NR_UARTS, - .cons = AR933X_SERIAL_CONSOLE, -}; - -static int __devinit ar933x_uart_probe(struct platform_device *pdev) -{ - struct ar933x_uart_platform_data *pdata; - struct ar933x_uart_port *up; - struct uart_port *port; - struct resource *mem_res; - struct resource *irq_res; - int id; - int ret; - - pdata = pdev->dev.platform_data; - if (!pdata) - return -EINVAL; - - id = pdev->id; - if (id == -1) - id = 0; - - if (id > CONFIG_SERIAL_AR933X_NR_UARTS) - return -EINVAL; - - mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mem_res) { - dev_err(&pdev->dev, "no MEM resource\n"); - return -EINVAL; - } - - irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!irq_res) { - dev_err(&pdev->dev, "no IRQ resource\n"); - return -EINVAL; - } - - up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL); - if (!up) - return -ENOMEM; - - port = &up->port; - port->mapbase = mem_res->start; - - port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE); - if (!port->membase) { - ret = -ENOMEM; - goto err_free_up; - } - - port->line = id; - port->irq = irq_res->start; - port->dev = &pdev->dev; - port->type = PORT_AR933X; - port->iotype = UPIO_MEM32; - port->uartclk = pdata->uartclk; - - port->regshift = 2; - port->fifosize = AR933X_UART_FIFO_SIZE; - port->ops = &ar933x_uart_ops; - - ar933x_uart_add_console_port(up); - - ret = uart_add_one_port(&ar933x_uart_driver, &up->port); - if (ret) - goto err_unmap; - - platform_set_drvdata(pdev, up); - return 0; - -err_unmap: - iounmap(up->port.membase); -err_free_up: - kfree(up); - return ret; -} - -static int __devexit ar933x_uart_remove(struct platform_device *pdev) -{ - struct ar933x_uart_port *up; - - up = platform_get_drvdata(pdev); - platform_set_drvdata(pdev, NULL); - - if (up) { - uart_remove_one_port(&ar933x_uart_driver, &up->port); - iounmap(up->port.membase); - kfree(up); - } - - return 0; -} - -static struct platform_driver ar933x_uart_platform_driver = { - .probe = ar933x_uart_probe, - .remove = __devexit_p(ar933x_uart_remove), - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init ar933x_uart_init(void) -{ - int ret; - - ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS; - ret = uart_register_driver(&ar933x_uart_driver); - if (ret) - goto err_out; - - ret = platform_driver_register(&ar933x_uart_platform_driver); - if (ret) - goto err_unregister_uart_driver; - - return 0; - -err_unregister_uart_driver: - uart_unregister_driver(&ar933x_uart_driver); -err_out: - return ret; -} - -static void __exit ar933x_uart_exit(void) -{ - platform_driver_unregister(&ar933x_uart_platform_driver); - uart_unregister_driver(&ar933x_uart_driver); -} - -module_init(ar933x_uart_init); -module_exit(ar933x_uart_exit); - -MODULE_DESCRIPTION("Atheros AR933X UART driver"); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:" DRIVER_NAME); |