diff options
Diffstat (limited to 'drivers/serial/clps711x.c')
| -rw-r--r-- | drivers/serial/clps711x.c | 579 |
1 files changed, 0 insertions, 579 deletions
diff --git a/drivers/serial/clps711x.c b/drivers/serial/clps711x.c deleted file mode 100644 index b6acd19b458e..000000000000 --- a/drivers/serial/clps711x.c +++ /dev/null @@ -1,579 +0,0 @@ -/* - * linux/drivers/char/clps711x.c - * - * Driver for CLPS711x serial ports - * - * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. - * - * Copyright 1999 ARM Limited - * Copyright (C) 2000 Deep Blue Solutions Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#if defined(CONFIG_SERIAL_CLPS711X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/module.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/sysrq.h> -#include <linux/spinlock.h> -#include <linux/device.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> -#include <linux/serial.h> -#include <linux/io.h> - -#include <mach/hardware.h> -#include <asm/irq.h> -#include <asm/hardware/clps7111.h> - -#define UART_NR 2 - -#define SERIAL_CLPS711X_MAJOR 204 -#define SERIAL_CLPS711X_MINOR 40 -#define SERIAL_CLPS711X_NR UART_NR - -/* - * We use the relevant SYSCON register as a base address for these ports. - */ -#define UBRLCR(port) ((port)->iobase + UBRLCR1 - SYSCON1) -#define UARTDR(port) ((port)->iobase + UARTDR1 - SYSCON1) -#define SYSFLG(port) ((port)->iobase + SYSFLG1 - SYSCON1) -#define SYSCON(port) ((port)->iobase + SYSCON1 - SYSCON1) - -#define TX_IRQ(port) ((port)->irq) -#define RX_IRQ(port) ((port)->irq + 1) - -#define UART_ANY_ERR (UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR) - -#define tx_enabled(port) ((port)->unused[0]) - -static void clps711xuart_stop_tx(struct uart_port *port) -{ - if (tx_enabled(port)) { - disable_irq(TX_IRQ(port)); - tx_enabled(port) = 0; - } -} - -static void clps711xuart_start_tx(struct uart_port *port) -{ - if (!tx_enabled(port)) { - enable_irq(TX_IRQ(port)); - tx_enabled(port) = 1; - } -} - -static void clps711xuart_stop_rx(struct uart_port *port) -{ - disable_irq(RX_IRQ(port)); -} - -static void clps711xuart_enable_ms(struct uart_port *port) -{ -} - -static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - struct tty_struct *tty = port->state->port.tty; - unsigned int status, ch, flg; - - status = clps_readl(SYSFLG(port)); - while (!(status & SYSFLG_URXFE)) { - ch = clps_readl(UARTDR(port)); - - port->icount.rx++; - - flg = TTY_NORMAL; - - /* - * Note that the error handling code is - * out of the main execution path - */ - if (unlikely(ch & UART_ANY_ERR)) { - if (ch & UARTDR_PARERR) - port->icount.parity++; - else if (ch & UARTDR_FRMERR) - port->icount.frame++; - if (ch & UARTDR_OVERR) - port->icount.overrun++; - - ch &= port->read_status_mask; - - if (ch & UARTDR_PARERR) - flg = TTY_PARITY; - else if (ch & UARTDR_FRMERR) - flg = TTY_FRAME; - -#ifdef SUPPORT_SYSRQ - port->sysrq = 0; -#endif - } - - if (uart_handle_sysrq_char(port, ch)) - goto ignore_char; - - /* - * CHECK: does overrun affect the current character? - * ASSUMPTION: it does not. - */ - uart_insert_char(port, ch, UARTDR_OVERR, ch, flg); - - ignore_char: - status = clps_readl(SYSFLG(port)); - } - tty_flip_buffer_push(tty); - return IRQ_HANDLED; -} - -static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - struct circ_buf *xmit = &port->state->xmit; - int count; - - if (port->x_char) { - clps_writel(port->x_char, UARTDR(port)); - port->icount.tx++; - port->x_char = 0; - return IRQ_HANDLED; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - clps711xuart_stop_tx(port); - return IRQ_HANDLED; - } - - count = port->fifosize >> 1; - do { - clps_writel(xmit->buf[xmit->tail], UARTDR(port)); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - if (uart_circ_empty(xmit)) - break; - } while (--count > 0); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - if (uart_circ_empty(xmit)) - clps711xuart_stop_tx(port); - - return IRQ_HANDLED; -} - -static unsigned int clps711xuart_tx_empty(struct uart_port *port) -{ - unsigned int status = clps_readl(SYSFLG(port)); - return status & SYSFLG_UBUSY ? 0 : TIOCSER_TEMT; -} - -static unsigned int clps711xuart_get_mctrl(struct uart_port *port) -{ - unsigned int port_addr; - unsigned int result = 0; - unsigned int status; - - port_addr = SYSFLG(port); - if (port_addr == SYSFLG1) { - status = clps_readl(SYSFLG1); - if (status & SYSFLG1_DCD) - result |= TIOCM_CAR; - if (status & SYSFLG1_DSR) - result |= TIOCM_DSR; - if (status & SYSFLG1_CTS) - result |= TIOCM_CTS; - } - - return result; -} - -static void -clps711xuart_set_mctrl_null(struct uart_port *port, unsigned int mctrl) -{ -} - -static void clps711xuart_break_ctl(struct uart_port *port, int break_state) -{ - unsigned long flags; - unsigned int ubrlcr; - - spin_lock_irqsave(&port->lock, flags); - ubrlcr = clps_readl(UBRLCR(port)); - if (break_state == -1) - ubrlcr |= UBRLCR_BREAK; - else - ubrlcr &= ~UBRLCR_BREAK; - clps_writel(ubrlcr, UBRLCR(port)); - spin_unlock_irqrestore(&port->lock, flags); -} - -static int clps711xuart_startup(struct uart_port *port) -{ - unsigned int syscon; - int retval; - - tx_enabled(port) = 1; - - /* - * Allocate the IRQs - */ - retval = request_irq(TX_IRQ(port), clps711xuart_int_tx, 0, - "clps711xuart_tx", port); - if (retval) - return retval; - - retval = request_irq(RX_IRQ(port), clps711xuart_int_rx, 0, - "clps711xuart_rx", port); - if (retval) { - free_irq(TX_IRQ(port), port); - return retval; - } - - /* - * enable the port - */ - syscon = clps_readl(SYSCON(port)); - syscon |= SYSCON_UARTEN; - clps_writel(syscon, SYSCON(port)); - - return 0; -} - -static void clps711xuart_shutdown(struct uart_port *port) -{ - unsigned int ubrlcr, syscon; - - /* - * Free the interrupt - */ - free_irq(TX_IRQ(port), port); /* TX interrupt */ - free_irq(RX_IRQ(port), port); /* RX interrupt */ - - /* - * disable the port - */ - syscon = clps_readl(SYSCON(port)); - syscon &= ~SYSCON_UARTEN; - clps_writel(syscon, SYSCON(port)); - - /* - * disable break condition and fifos - */ - ubrlcr = clps_readl(UBRLCR(port)); - ubrlcr &= ~(UBRLCR_FIFOEN | UBRLCR_BREAK); - clps_writel(ubrlcr, UBRLCR(port)); -} - -static void -clps711xuart_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - unsigned int ubrlcr, baud, quot; - unsigned long flags; - - /* - * We don't implement CREAD. - */ - termios->c_cflag |= CREAD; - - /* - * Ask the core to calculate the divisor for us. - */ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); - - switch (termios->c_cflag & CSIZE) { - case CS5: - ubrlcr = UBRLCR_WRDLEN5; - break; - case CS6: - ubrlcr = UBRLCR_WRDLEN6; - break; - case CS7: - ubrlcr = UBRLCR_WRDLEN7; - break; - default: // CS8 - ubrlcr = UBRLCR_WRDLEN8; - break; - } - if (termios->c_cflag & CSTOPB) - ubrlcr |= UBRLCR_XSTOP; - if (termios->c_cflag & PARENB) { - ubrlcr |= UBRLCR_PRTEN; - if (!(termios->c_cflag & PARODD)) - ubrlcr |= UBRLCR_EVENPRT; - } - if (port->fifosize > 1) - ubrlcr |= UBRLCR_FIFOEN; - - spin_lock_irqsave(&port->lock, flags); - - /* - * Update the per-port timeout. - */ - uart_update_timeout(port, termios->c_cflag, baud); - - port->read_status_mask = UARTDR_OVERR; - if (termios->c_iflag & INPCK) - port->read_status_mask |= UARTDR_PARERR | UARTDR_FRMERR; - - /* - * Characters to ignore - */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= UARTDR_FRMERR | UARTDR_PARERR; - if (termios->c_iflag & IGNBRK) { - /* - * If we're ignoring parity and break indicators, - * ignore overruns to (for real raw support). - */ - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= UARTDR_OVERR; - } - - quot -= 1; - - clps_writel(ubrlcr | quot, UBRLCR(port)); - - spin_unlock_irqrestore(&port->lock, flags); -} - -static const char *clps711xuart_type(struct uart_port *port) -{ - return port->type == PORT_CLPS711X ? "CLPS711x" : NULL; -} - -/* - * Configure/autoconfigure the port. - */ -static void clps711xuart_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) - port->type = PORT_CLPS711X; -} - -static void clps711xuart_release_port(struct uart_port *port) -{ -} - -static int clps711xuart_request_port(struct uart_port *port) -{ - return 0; -} - -static struct uart_ops clps711x_pops = { - .tx_empty = clps711xuart_tx_empty, - .set_mctrl = clps711xuart_set_mctrl_null, - .get_mctrl = clps711xuart_get_mctrl, - .stop_tx = clps711xuart_stop_tx, - .start_tx = clps711xuart_start_tx, - .stop_rx = clps711xuart_stop_rx, - .enable_ms = clps711xuart_enable_ms, - .break_ctl = clps711xuart_break_ctl, - .startup = clps711xuart_startup, - .shutdown = clps711xuart_shutdown, - .set_termios = clps711xuart_set_termios, - .type = clps711xuart_type, - .config_port = clps711xuart_config_port, - .release_port = clps711xuart_release_port, - .request_port = clps711xuart_request_port, -}; - -static struct uart_port clps711x_ports[UART_NR] = { - { - .iobase = SYSCON1, - .irq = IRQ_UTXINT1, /* IRQ_URXINT1, IRQ_UMSINT */ - .uartclk = 3686400, - .fifosize = 16, - .ops = &clps711x_pops, - .line = 0, - .flags = UPF_BOOT_AUTOCONF, - }, - { - .iobase = SYSCON2, - .irq = IRQ_UTXINT2, /* IRQ_URXINT2 */ - .uartclk = 3686400, - .fifosize = 16, - .ops = &clps711x_pops, - .line = 1, - .flags = UPF_BOOT_AUTOCONF, - } -}; - -#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE -static void clps711xuart_console_putchar(struct uart_port *port, int ch) -{ - while (clps_readl(SYSFLG(port)) & SYSFLG_UTXFF) - barrier(); - clps_writel(ch, UARTDR(port)); -} - -/* - * Print a string to the serial port trying not to disturb - * any possible real use of the port... - * - * The console_lock must be held when we get here. - * - * Note that this is called with interrupts already disabled - */ -static void -clps711xuart_console_write(struct console *co, const char *s, - unsigned int count) -{ - struct uart_port *port = clps711x_ports + co->index; - unsigned int status, syscon; - - /* - * Ensure that the port is enabled. - */ - syscon = clps_readl(SYSCON(port)); - clps_writel(syscon | SYSCON_UARTEN, SYSCON(port)); - - uart_console_write(port, s, count, clps711xuart_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore the uart state. - */ - do { - status = clps_readl(SYSFLG(port)); - } while (status & SYSFLG_UBUSY); - - clps_writel(syscon, SYSCON(port)); -} - -static void __init -clps711xuart_console_get_options(struct uart_port *port, int *baud, - int *parity, int *bits) -{ - if (clps_readl(SYSCON(port)) & SYSCON_UARTEN) { - unsigned int ubrlcr, quot; - - ubrlcr = clps_readl(UBRLCR(port)); - - *parity = 'n'; - if (ubrlcr & UBRLCR_PRTEN) { - if (ubrlcr & UBRLCR_EVENPRT) - *parity = 'e'; - else - *parity = 'o'; - } - - if ((ubrlcr & UBRLCR_WRDLEN_MASK) == UBRLCR_WRDLEN7) - *bits = 7; - else - *bits = 8; - - quot = ubrlcr & UBRLCR_BAUD_MASK; - *baud = port->uartclk / (16 * (quot + 1)); - } -} - -static int __init clps711xuart_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 38400; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - /* - * Check whether an invalid uart number has been specified, and - * if so, search for the first available port that does have - * console support. - */ - port = uart_get_console(clps711x_ports, UART_NR, co); - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - clps711xuart_console_get_options(port, &baud, &parity, &bits); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct uart_driver clps711x_reg; -static struct console clps711x_console = { - .name = "ttyCL", - .write = clps711xuart_console_write, - .device = uart_console_device, - .setup = clps711xuart_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &clps711x_reg, -}; - -static int __init clps711xuart_console_init(void) -{ - register_console(&clps711x_console); - return 0; -} -console_initcall(clps711xuart_console_init); - -#define CLPS711X_CONSOLE &clps711x_console -#else -#define CLPS711X_CONSOLE NULL -#endif - -static struct uart_driver clps711x_reg = { - .driver_name = "ttyCL", - .dev_name = "ttyCL", - .major = SERIAL_CLPS711X_MAJOR, - .minor = SERIAL_CLPS711X_MINOR, - .nr = UART_NR, - - .cons = CLPS711X_CONSOLE, -}; - -static int __init clps711xuart_init(void) -{ - int ret, i; - - printk(KERN_INFO "Serial: CLPS711x driver\n"); - - ret = uart_register_driver(&clps711x_reg); - if (ret) - return ret; - - for (i = 0; i < UART_NR; i++) - uart_add_one_port(&clps711x_reg, &clps711x_ports[i]); - - return 0; -} - -static void __exit clps711xuart_exit(void) -{ - int i; - - for (i = 0; i < UART_NR; i++) - uart_remove_one_port(&clps711x_reg, &clps711x_ports[i]); - - uart_unregister_driver(&clps711x_reg); -} - -module_init(clps711xuart_init); -module_exit(clps711xuart_exit); - -MODULE_AUTHOR("Deep Blue Solutions Ltd"); -MODULE_DESCRIPTION("CLPS-711x generic serial driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_CHARDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR); |