+++ /dev/null
-/*
- * 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 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
- *
- * Copyright (C) 2004 Infineon IFAP DC COM CPE
- * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
- */
-
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/circ_buf.h>
-#include <linux/serial.h>
-#include <linux/serial_core.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/irq.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-#include <linux/bitops.h>
-
-#include <asm/system.h>
-
-#include <ifxmips.h>
-#include <ifxmips_irq.h>
-
-#define PORT_IFXMIPSASC 111
-
-#include <linux/serial_core.h>
-
-#define UART_DUMMY_UER_RX 1
-
-static void ifxmipsasc_tx_chars(struct uart_port *port);
-extern void prom_printf(const char *fmt, ...);
-static struct uart_port ifxmipsasc_port[2];
-static struct uart_driver ifxmipsasc_reg;
-extern unsigned int ifxmips_get_fpi_hz(void);
-
-static void ifxmipsasc_stop_tx(struct uart_port *port)
-{
- return;
-}
-
-static void ifxmipsasc_start_tx(struct uart_port *port)
-{
- unsigned long flags;
- local_irq_save(flags);
- ifxmipsasc_tx_chars(port);
- local_irq_restore(flags);
- return;
-}
-
-static void ifxmipsasc_stop_rx(struct uart_port *port)
-{
- ifxmips_w32(ASCWHBSTATE_CLRREN, port->membase + IFXMIPS_ASC_WHBSTATE);
-}
-
-static void ifxmipsasc_enable_ms(struct uart_port *port)
-{
-}
-
-#include <linux/version.h>
-
-static void ifxmipsasc_rx_chars(struct uart_port *port)
-{
- struct tty_struct *tty = port->state->port.tty;
- unsigned int ch = 0, rsr = 0, fifocnt;
-
- fifocnt = ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
- while (fifocnt--) {
- u8 flag = TTY_NORMAL;
- ch = ifxmips_r32(port->membase + IFXMIPS_ASC_RBUF);
- rsr = (ifxmips_r32(port->membase + IFXMIPS_ASC_STATE) & ASCSTATE_ANY) | UART_DUMMY_UER_RX;
- tty_flip_buffer_push(tty);
- port->icount.rx++;
-
- /*
- * Note that the error handling code is
- * out of the main execution path
- */
- if (rsr & ASCSTATE_ANY) {
- if (rsr & ASCSTATE_PE) {
- port->icount.parity++;
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRPE, port->membase + IFXMIPS_ASC_WHBSTATE);
- } else if (rsr & ASCSTATE_FE) {
- port->icount.frame++;
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRFE, port->membase + IFXMIPS_ASC_WHBSTATE);
- }
- if (rsr & ASCSTATE_ROE) {
- port->icount.overrun++;
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRROE, port->membase + IFXMIPS_ASC_WHBSTATE);
- }
-
- rsr &= port->read_status_mask;
-
- if (rsr & ASCSTATE_PE)
- flag = TTY_PARITY;
- else if (rsr & ASCSTATE_FE)
- flag = TTY_FRAME;
- }
-
- if ((rsr & port->ignore_status_mask) == 0)
- tty_insert_flip_char(tty, ch, flag);
-
- if (rsr & ASCSTATE_ROE)
- /*
- * Overrun is special, since it's reported
- * immediately, and doesn't affect the current
- * character
- */
- tty_insert_flip_char(tty, 0, TTY_OVERRUN);
- }
- if (ch != 0)
- tty_flip_buffer_push(tty);
- return;
-}
-
-
-static void ifxmipsasc_tx_chars(struct uart_port *port)
-{
- struct circ_buf *xmit = &port->state->xmit;
- if (uart_tx_stopped(port)) {
- ifxmipsasc_stop_tx(port);
- return;
- }
-
- while (((ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK)
- >> ASCFSTAT_TXFFLOFF) != TXFIFO_FULL) {
- if (port->x_char) {
- ifxmips_w32(port->x_char, port->membase + IFXMIPS_ASC_TBUF);
- port->icount.tx++;
- port->x_char = 0;
- continue;
- }
-
- if (uart_circ_empty(xmit))
- break;
-
- ifxmips_w32(port->state->xmit.buf[port->state->xmit.tail], port->membase + IFXMIPS_ASC_TBUF);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-}
-
-static irqreturn_t ifxmipsasc_tx_int(int irq, void *_port)
-{
- struct uart_port *port = (struct uart_port *)_port;
- ifxmips_w32(ASC_IRNCR_TIR, port->membase + IFXMIPS_ASC_IRNCR);
- ifxmipsasc_start_tx(port);
- ifxmips_mask_and_ack_irq(irq);
- return IRQ_HANDLED;
-}
-
-static irqreturn_t ifxmipsasc_er_int(int irq, void *_port)
-{
- struct uart_port *port = (struct uart_port *)_port;
- /* clear any pending interrupts */
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRPE |
- ASCWHBSTATE_CLRFE | ASCWHBSTATE_CLRROE, port->membase + IFXMIPS_ASC_WHBSTATE);
- return IRQ_HANDLED;
-}
-
-static irqreturn_t ifxmipsasc_rx_int(int irq, void *_port)
-{
- struct uart_port *port = (struct uart_port *)_port;
- ifxmips_w32(ASC_IRNCR_RIR, port->membase + IFXMIPS_ASC_IRNCR);
- ifxmipsasc_rx_chars((struct uart_port *)port);
- ifxmips_mask_and_ack_irq(irq);
- return IRQ_HANDLED;
-}
-
-static unsigned int ifxmipsasc_tx_empty(struct uart_port *port)
-{
- int status;
- status = ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
- return status ? 0 : TIOCSER_TEMT;
-}
-
-static unsigned int ifxmipsasc_get_mctrl(struct uart_port *port)
-{
- return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
-}
-
-static void ifxmipsasc_set_mctrl(struct uart_port *port, u_int mctrl)
-{
-}
-
-static void ifxmipsasc_break_ctl(struct uart_port *port, int break_state)
-{
-}
-
-static int ifxmipsasc_startup(struct uart_port *port)
-{
- int retval;
-
- port->uartclk = ifxmips_get_fpi_hz();
-
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CLC) & ~IFXMIPS_ASC_CLC_DISS, port->membase + IFXMIPS_ASC_CLC);
- ifxmips_w32(((ifxmips_r32(port->membase + IFXMIPS_ASC_CLC) & ~ASCCLC_RMCMASK)) | (1 << ASCCLC_RMCOFFSET), port->membase + IFXMIPS_ASC_CLC);
- ifxmips_w32(0, port->membase + IFXMIPS_ASC_PISEL);
- ifxmips_w32(((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) | ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU, port->membase + IFXMIPS_ASC_TXFCON);
- ifxmips_w32(((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK) | ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU, port->membase + IFXMIPS_ASC_RXFCON);
- wmb();
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN, port->membase + IFXMIPS_ASC_CON);
-
- retval = request_irq(port->irq, ifxmipsasc_tx_int, IRQF_DISABLED, "asc_tx", port);
- if (retval) {
- printk(KERN_ERR "failed to request ifxmipsasc_tx_int\n");
- return retval;
- }
-
- retval = request_irq(port->irq + 2, ifxmipsasc_rx_int, IRQF_DISABLED, "asc_rx", port);
- if (retval) {
- printk(KERN_ERR "failed to request ifxmipsasc_rx_int\n");
- goto err1;
- }
-
- retval = request_irq(port->irq + 3, ifxmipsasc_er_int, IRQF_DISABLED, "asc_er", port);
- if (retval) {
- printk(KERN_ERR "failed to request ifxmipsasc_er_int\n");
- goto err2;
- }
-
- ifxmips_w32(ASC_IRNREN_RX_BUF | ASC_IRNREN_TX_BUF | ASC_IRNREN_ERR | ASC_IRNREN_TX, port->membase + IFXMIPS_ASC_IRNREN);
- return 0;
-
-err2:
- free_irq(port->irq + 2, port);
-err1:
- free_irq(port->irq, port);
- return retval;
-}
-
-static void ifxmipsasc_shutdown(struct uart_port *port)
-{
- free_irq(port->irq, port);
- free_irq(port->irq + 2, port);
- free_irq(port->irq + 3, port);
-
- ifxmips_w32(0, port->membase + IFXMIPS_ASC_CON);
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_RXFCON) | ASCRXFCON_RXFFLU, port->membase + IFXMIPS_ASC_RXFCON);
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_RXFCON) & ~ASCRXFCON_RXFEN, port->membase + IFXMIPS_ASC_RXFCON);
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_TXFCON) | ASCTXFCON_TXFFLU, port->membase + IFXMIPS_ASC_TXFCON);
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_TXFCON) & ~ASCTXFCON_TXFEN, port->membase + IFXMIPS_ASC_TXFCON);
-}
-
-static void ifxmipsasc_set_termios(struct uart_port *port, struct ktermios *new, struct ktermios *old)
-{
- unsigned int cflag;
- unsigned int iflag;
- unsigned int quot;
- unsigned int baud;
- unsigned int con = 0;
- unsigned long flags;
-
- cflag = new->c_cflag;
- iflag = new->c_iflag;
-
- switch (cflag & CSIZE) {
- case CS7:
- con = ASCCON_M_7ASYNC;
- break;
-
- case CS5:
- case CS6:
- default:
- con = ASCCON_M_8ASYNC;
- break;
- }
-
- if (cflag & CSTOPB)
- con |= ASCCON_STP;
-
- if (cflag & PARENB) {
- if (!(cflag & PARODD))
- con &= ~ASCCON_ODD;
- else
- con |= ASCCON_ODD;
- }
-
- port->read_status_mask = ASCSTATE_ROE;
- if (iflag & INPCK)
- port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
-
- port->ignore_status_mask = 0;
- if (iflag & IGNPAR)
- port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
-
- if (iflag & IGNBRK) {
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (iflag & IGNPAR)
- port->ignore_status_mask |= ASCSTATE_ROE;
- }
-
- if ((cflag & CREAD) == 0)
- port->ignore_status_mask |= UART_DUMMY_UER_RX;
-
- /* set error signals - framing, parity and overrun, enable receiver */
- con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
-
- local_irq_save(flags);
-
- /* set up CON */
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | con, port->membase + IFXMIPS_ASC_CON);
-
- /* Set baud rate - take a divider of 2 into account */
- baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
- quot = uart_get_divisor(port, baud);
- quot = quot / 2 - 1;
-
- /* disable the baudrate generator */
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_R, port->membase + IFXMIPS_ASC_CON);
-
- /* make sure the fractional divider is off */
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_FDE, port->membase + IFXMIPS_ASC_CON);
-
- /* set up to use divisor of 2 */
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_BRS, port->membase + IFXMIPS_ASC_CON);
-
- /* now we can write the new baudrate into the register */
- ifxmips_w32(quot, port->membase + IFXMIPS_ASC_BG);
-
- /* turn the baudrate generator back on */
- ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | ASCCON_R, port->membase + IFXMIPS_ASC_CON);
-
- /* enable rx */
- ifxmips_w32(ASCWHBSTATE_SETREN, port->membase + IFXMIPS_ASC_WHBSTATE);
-
- local_irq_restore(flags);
-}
-
-static const char *ifxmipsasc_type(struct uart_port *port)
-{
- if (port->type == PORT_IFXMIPSASC) {
- if (port->membase == (void *)IFXMIPS_ASC_BASE_ADDR)
- return "asc0";
- else
- return "asc1";
- } else {
- return NULL;
- }
-}
-
-static void ifxmipsasc_release_port(struct uart_port *port)
-{
-}
-
-static int ifxmipsasc_request_port(struct uart_port *port)
-{
- return 0;
-}
-
-static void ifxmipsasc_config_port(struct uart_port *port, int flags)
-{
- if (flags & UART_CONFIG_TYPE) {
- port->type = PORT_IFXMIPSASC;
- ifxmipsasc_request_port(port);
- }
-}
-
-static int ifxmipsasc_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- int ret = 0;
- if (ser->type != PORT_UNKNOWN && ser->type != PORT_IFXMIPSASC)
- ret = -EINVAL;
- if (ser->irq < 0 || ser->irq >= NR_IRQS)
- ret = -EINVAL;
- if (ser->baud_base < 9600)
- ret = -EINVAL;
- return ret;
-}
-
-static struct uart_ops ifxmipsasc_pops = {
- .tx_empty = ifxmipsasc_tx_empty,
- .set_mctrl = ifxmipsasc_set_mctrl,
- .get_mctrl = ifxmipsasc_get_mctrl,
- .stop_tx = ifxmipsasc_stop_tx,
- .start_tx = ifxmipsasc_start_tx,
- .stop_rx = ifxmipsasc_stop_rx,
- .enable_ms = ifxmipsasc_enable_ms,
- .break_ctl = ifxmipsasc_break_ctl,
- .startup = ifxmipsasc_startup,
- .shutdown = ifxmipsasc_shutdown,
- .set_termios = ifxmipsasc_set_termios,
- .type = ifxmipsasc_type,
- .release_port = ifxmipsasc_release_port,
- .request_port = ifxmipsasc_request_port,
- .config_port = ifxmipsasc_config_port,
- .verify_port = ifxmipsasc_verify_port,
-};
-
-static struct uart_port ifxmipsasc_port[2] = {
- {
- .membase = (void *)IFXMIPS_ASC_BASE_ADDR,
- .mapbase = IFXMIPS_ASC_BASE_ADDR,
- .iotype = SERIAL_IO_MEM,
- .irq = IFXMIPSASC_TIR(0),
- .uartclk = 0,
- .fifosize = 16,
- .type = PORT_IFXMIPSASC,
- .ops = &ifxmipsasc_pops,
- .flags = ASYNC_BOOT_AUTOCONF,
- .line = 0
- }, {
- .membase = (void *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF),
- .mapbase = IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF,
- .iotype = SERIAL_IO_MEM,
- .irq = IFXMIPSASC_TIR(1),
- .uartclk = 0,
- .fifosize = 16,
- .type = PORT_IFXMIPSASC,
- .ops = &ifxmipsasc_pops,
- .flags = ASYNC_BOOT_AUTOCONF,
- .line = 1
- }
-};
-
-static void ifxmipsasc_console_write(struct console *co, const char *s, u_int count)
-{
- int port = co->index;
- int i, fifocnt;
- unsigned long flags;
- local_irq_save(flags);
- for (i = 0; i < count; i++) {
- do {
- fifocnt = (ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_FSTAT)) & ASCFSTAT_TXFFLMASK)
- >> ASCFSTAT_TXFFLOFF;
- } while (fifocnt == TXFIFO_FULL);
-
- if (s[i] == '\0')
- break;
-
- if (s[i] == '\n') {
- ifxmips_w32('\r', (u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_TBUF));
- do {
- fifocnt = (ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_FSTAT)) & ASCFSTAT_TXFFLMASK)
- >> ASCFSTAT_TXFFLOFF;
- } while (fifocnt == TXFIFO_FULL);
- }
- ifxmips_w32(s[i], (u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_TBUF));
- }
-
- local_irq_restore(flags);
-}
-
-static int __init ifxmipsasc_console_setup(struct console *co, char *options)
-{
- int port = co->index;
- int baud = 115200;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
- ifxmipsasc_port[port].uartclk = ifxmips_get_fpi_hz();
- ifxmipsasc_port[port].type = PORT_IFXMIPSASC;
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
- return uart_set_options(&ifxmipsasc_port[port], co, baud, parity, bits, flow);
-}
-
-static struct console ifxmipsasc_console[2] =
-{
- {
- .name = "ttyS",
- .write = ifxmipsasc_console_write,
- .device = uart_console_device,
- .setup = ifxmipsasc_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = 0,
- .data = &ifxmipsasc_reg,
- }, {
- .name = "ttyS",
- .write = ifxmipsasc_console_write,
- .device = uart_console_device,
- .setup = ifxmipsasc_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = 1,
- .data = &ifxmipsasc_reg,
- }
-};
-
-static int __init ifxmipsasc_console_init(void)
-{
- register_console(&ifxmipsasc_console[0]);
- register_console(&ifxmipsasc_console[1]);
- return 0;
-}
-console_initcall(ifxmipsasc_console_init);
-
-static struct uart_driver ifxmipsasc_reg = {
- .owner = THIS_MODULE,
- .driver_name = "serial",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
- .minor = 64,
- .nr = 2,
- .cons = &ifxmipsasc_console[1],
-};
-
-int __init ifxmipsasc_init(void)
-{
- int ret;
- uart_register_driver(&ifxmipsasc_reg);
- ret = uart_add_one_port(&ifxmipsasc_reg, &ifxmipsasc_port[0]);
- ret = uart_add_one_port(&ifxmipsasc_reg, &ifxmipsasc_port[1]);
- return 0;
-}
-
-void __exit ifxmipsasc_exit(void)
-{
- uart_unregister_driver(&ifxmipsasc_reg);
-}
-
-module_init(ifxmipsasc_init);
-module_exit(ifxmipsasc_exit);
-
-MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
-MODULE_DESCRIPTION("MIPS IFXMips serial port driver");
-MODULE_LICENSE("GPL");
projects / openwrt / svn-archive / archive.git / blobdiff