+Index: linux-2.6.30.10/drivers/serial/ifxmips_asc.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.10/drivers/serial/ifxmips_asc.c 2010-03-18 14:04:58.000000000 +0100
+@@ -0,0 +1,555 @@
++/*
++ * 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)
++{
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 26))
++ struct tty_struct *tty = port->info->port.tty;
++#else
++ struct tty_struct *tty = port->info->tty;
++#endif
++ 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->info->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->info->xmit.buf[port->info->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");
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