+++ /dev/null
-/*
- * linux/drivers/char/serial_21285.c
- *
- * Driver for the serial port on the 21285 StrongArm-110 core logic chip.
- *
- * Based on drivers/char/serial.c
- */
-
-#include <linux/config.h>
-#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/serial.h>
-#include <linux/major.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/console.h>
-
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-#include <asm/dec21285.h>
-#include <asm/hardware.h>
-
-#define BAUD_BASE (mem_fclk_21285/64)
-
-#define SERIAL_21285_NAME "ttyFB"
-#define SERIAL_21285_MAJOR 204
-#define SERIAL_21285_MINOR 4
-
-#define SERIAL_21285_AUXNAME "cuafb"
-#define SERIAL_21285_AUXMAJOR 205
-#define SERIAL_21285_AUXMINOR 4
-
-static struct tty_driver rs285_driver, callout_driver;
-static int rs285_refcount;
-static struct tty_struct *rs285_table[1];
-
-static struct termios *rs285_termios[1];
-static struct termios *rs285_termios_locked[1];
-
-static char wbuf[1000], *putp = wbuf, *getp = wbuf, x_char;
-static struct tty_struct *rs285_tty;
-static int rs285_use_count;
-
-static int rs285_write_room(struct tty_struct *tty)
-{
- return putp >= getp ? (sizeof(wbuf) - (long) putp + (long) getp) : ((long) getp - (long) putp - 1);
-}
-
-static void rs285_rx_int(int irq, void *dev_id, struct pt_regs *regs)
-{
- if (!rs285_tty) {
- disable_irq(IRQ_CONRX);
- return;
- }
- while (!(*CSR_UARTFLG & 0x10)) {
- int ch, flag;
- ch = *CSR_UARTDR;
- flag = *CSR_RXSTAT;
- if (flag & 4)
- tty_insert_flip_char(rs285_tty, 0, TTY_OVERRUN);
- if (flag & 2)
- flag = TTY_PARITY;
- else if (flag & 1)
- flag = TTY_FRAME;
- tty_insert_flip_char(rs285_tty, ch, flag);
- }
- tty_flip_buffer_push(rs285_tty);
-}
-
-static void rs285_send_xchar(struct tty_struct *tty, char ch)
-{
- x_char = ch;
- enable_irq(IRQ_CONTX);
-}
-
-static void rs285_throttle(struct tty_struct *tty)
-{
- if (I_IXOFF(tty))
- rs285_send_xchar(tty, STOP_CHAR(tty));
-}
-
-static void rs285_unthrottle(struct tty_struct *tty)
-{
- if (I_IXOFF(tty)) {
- if (x_char)
- x_char = 0;
- else
- rs285_send_xchar(tty, START_CHAR(tty));
- }
-}
-
-static void rs285_tx_int(int irq, void *dev_id, struct pt_regs *regs)
-{
- while (!(*CSR_UARTFLG & 0x20)) {
- if (x_char) {
- *CSR_UARTDR = x_char;
- x_char = 0;
- continue;
- }
- if (putp == getp) {
- disable_irq(IRQ_CONTX);
- break;
- }
- *CSR_UARTDR = *getp;
- if (++getp >= wbuf + sizeof(wbuf))
- getp = wbuf;
- }
- if (rs285_tty)
- wake_up_interruptible(&rs285_tty->write_wait);
-}
-
-static inline int rs285_xmit(int ch)
-{
- if (putp + 1 == getp || (putp + 1 == wbuf + sizeof(wbuf) && getp == wbuf))
- return 0;
- *putp = ch;
- if (++putp >= wbuf + sizeof(wbuf))
- putp = wbuf;
- enable_irq(IRQ_CONTX);
- return 1;
-}
-
-static int rs285_write(struct tty_struct *tty, int from_user,
- const u_char * buf, int count)
-{
- int i;
-
- if (from_user && verify_area(VERIFY_READ, buf, count))
- return -EINVAL;
-
- for (i = 0; i < count; i++) {
- char ch;
- if (from_user)
- __get_user(ch, buf + i);
- else
- ch = buf[i];
- if (!rs285_xmit(ch))
- break;
- }
- return i;
-}
-
-static void rs285_put_char(struct tty_struct *tty, u_char ch)
-{
- rs285_xmit(ch);
-}
-
-static int rs285_chars_in_buffer(struct tty_struct *tty)
-{
- return sizeof(wbuf) - rs285_write_room(tty);
-}
-
-static void rs285_flush_buffer(struct tty_struct *tty)
-{
- disable_irq(IRQ_CONTX);
- putp = getp = wbuf;
- if (x_char)
- enable_irq(IRQ_CONTX);
-}
-
-static inline void rs285_set_cflag(int cflag)
-{
- int h_lcr, baud, quot;
-
- switch (cflag & CSIZE) {
- case CS5:
- h_lcr = 0x10;
- break;
- case CS6:
- h_lcr = 0x30;
- break;
- case CS7:
- h_lcr = 0x50;
- break;
- default: /* CS8 */
- h_lcr = 0x70;
- break;
-
- }
- if (cflag & CSTOPB)
- h_lcr |= 0x08;
- if (cflag & PARENB)
- h_lcr |= 0x02;
- if (!(cflag & PARODD))
- h_lcr |= 0x04;
-
- switch (cflag & CBAUD) {
- case B200: baud = 200; break;
- case B300: baud = 300; break;
- case B1200: baud = 1200; break;
- case B1800: baud = 1800; break;
- case B2400: baud = 2400; break;
- case B4800: baud = 4800; break;
- default:
- case B9600: baud = 9600; break;
- case B19200: baud = 19200; break;
- case B38400: baud = 38400; break;
- case B57600: baud = 57600; break;
- case B115200: baud = 115200; break;
- }
-
- /*
- * The documented expression for selecting the divisor is:
- * BAUD_BASE / baud - 1
- * However, typically BAUD_BASE is not divisible by baud, so
- * we want to select the divisor that gives us the minimum
- * error. Therefore, we want:
- * int(BAUD_BASE / baud - 0.5) ->
- * int(BAUD_BASE / baud - (baud >> 1) / baud) ->
- * int((BAUD_BASE - (baud >> 1)) / baud)
- */
- quot = (BAUD_BASE - (baud >> 1)) / baud;
-
- *CSR_UARTCON = 0;
- *CSR_L_UBRLCR = quot & 0xff;
- *CSR_M_UBRLCR = (quot >> 8) & 0x0f;
- *CSR_H_UBRLCR = h_lcr;
- *CSR_UARTCON = 1;
-}
-
-static void rs285_set_termios(struct tty_struct *tty, struct termios *old)
-{
- if (old && tty->termios->c_cflag == old->c_cflag)
- return;
- rs285_set_cflag(tty->termios->c_cflag);
-}
-
-
-static void rs285_stop(struct tty_struct *tty)
-{
- disable_irq(IRQ_CONTX);
-}
-
-static void rs285_start(struct tty_struct *tty)
-{
- enable_irq(IRQ_CONTX);
-}
-
-static void rs285_wait_until_sent(struct tty_struct *tty, int timeout)
-{
- int orig_jiffies = jiffies;
- while (*CSR_UARTFLG & 8) {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(1);
- if (signal_pending(current))
- break;
- if (timeout && time_after(jiffies, orig_jiffies + timeout))
- break;
- }
- current->state = TASK_RUNNING;
-}
-
-static int rs285_open(struct tty_struct *tty, struct file *filp)
-{
- int line;
-
- MOD_INC_USE_COUNT;
- line = minor(tty->device) - tty->driver.minor_start;
- if (line) {
- MOD_DEC_USE_COUNT;
- return -ENODEV;
- }
-
- tty->driver_data = NULL;
- if (!rs285_tty)
- rs285_tty = tty;
-
- enable_irq(IRQ_CONRX);
- rs285_use_count++;
- return 0;
-}
-
-static void rs285_close(struct tty_struct *tty, struct file *filp)
-{
- if (!--rs285_use_count) {
- rs285_wait_until_sent(tty, 0);
- disable_irq(IRQ_CONRX);
- disable_irq(IRQ_CONTX);
- rs285_tty = NULL;
- }
- MOD_DEC_USE_COUNT;
-}
-
-static int __init rs285_init(void)
-{
- int baud = B9600;
-
- if (machine_is_personal_server())
- baud = B57600;
-
- rs285_driver.magic = TTY_DRIVER_MAGIC;
- rs285_driver.driver_name = "serial_21285";
- rs285_driver.name = SERIAL_21285_NAME;
- rs285_driver.major = SERIAL_21285_MAJOR;
- rs285_driver.minor_start = SERIAL_21285_MINOR;
- rs285_driver.num = 1;
- rs285_driver.type = TTY_DRIVER_TYPE_SERIAL;
- rs285_driver.subtype = SERIAL_TYPE_NORMAL;
- rs285_driver.init_termios = tty_std_termios;
- rs285_driver.init_termios.c_cflag = baud | CS8 | CREAD | HUPCL | CLOCAL;
- rs285_driver.flags = TTY_DRIVER_REAL_RAW;
- rs285_driver.refcount = &rs285_refcount;
- rs285_driver.table = rs285_table;
- rs285_driver.termios = rs285_termios;
- rs285_driver.termios_locked = rs285_termios_locked;
-
- rs285_driver.open = rs285_open;
- rs285_driver.close = rs285_close;
- rs285_driver.write = rs285_write;
- rs285_driver.put_char = rs285_put_char;
- rs285_driver.write_room = rs285_write_room;
- rs285_driver.chars_in_buffer = rs285_chars_in_buffer;
- rs285_driver.flush_buffer = rs285_flush_buffer;
- rs285_driver.throttle = rs285_throttle;
- rs285_driver.unthrottle = rs285_unthrottle;
- rs285_driver.send_xchar = rs285_send_xchar;
- rs285_driver.set_termios = rs285_set_termios;
- rs285_driver.stop = rs285_stop;
- rs285_driver.start = rs285_start;
- rs285_driver.wait_until_sent = rs285_wait_until_sent;
-
- callout_driver = rs285_driver;
- callout_driver.name = SERIAL_21285_AUXNAME;
- callout_driver.major = SERIAL_21285_AUXMAJOR;
- callout_driver.subtype = SERIAL_TYPE_CALLOUT;
-
- if (request_irq(IRQ_CONRX, rs285_rx_int, 0, "rs285", NULL))
- panic("Couldn't get rx irq for rs285");
-
- if (request_irq(IRQ_CONTX, rs285_tx_int, 0, "rs285", NULL))
- panic("Couldn't get tx irq for rs285");
-
- if (tty_register_driver(&rs285_driver))
- printk(KERN_ERR "Couldn't register 21285 serial driver\n");
- if (tty_register_driver(&callout_driver))
- printk(KERN_ERR "Couldn't register 21285 callout driver\n");
-
- return 0;
-}
-
-static void __exit rs285_fini(void)
-{
- unsigned long flags;
- int ret;
-
- save_flags(flags);
- cli();
- ret = tty_unregister_driver(&callout_driver);
- if (ret)
- printk(KERN_ERR "Unable to unregister 21285 callout driver "
- "(%d)\n", ret);
- ret = tty_unregister_driver(&rs285_driver);
- if (ret)
- printk(KERN_ERR "Unable to unregister 21285 driver (%d)\n",
- ret);
- free_irq(IRQ_CONTX, NULL);
- free_irq(IRQ_CONRX, NULL);
- restore_flags(flags);
-}
-
-module_init(rs285_init);
-module_exit(rs285_fini);
-
-#ifdef CONFIG_SERIAL_21285_CONSOLE
-/************** console driver *****************/
-
-static void rs285_console_write(struct console *co, const char *s, u_int count)
-{
- int i;
-
- disable_irq(IRQ_CONTX);
- for (i = 0; i < count; i++) {
- while (*CSR_UARTFLG & 0x20);
- *CSR_UARTDR = s[i];
- if (s[i] == '\n') {
- while (*CSR_UARTFLG & 0x20);
- *CSR_UARTDR = '\r';
- }
- }
- enable_irq(IRQ_CONTX);
-}
-
-static kdev_t rs285_console_device(struct console *c)
-{
- return mk_kdev(SERIAL_21285_MAJOR, SERIAL_21285_MINOR);
-}
-
-static int __init rs285_console_setup(struct console *co, char *options)
-{
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int cflag = CREAD | HUPCL | CLOCAL;
-
- if (machine_is_personal_server())
- baud = 57600;
-
- if (options) {
- char *s = options;
- baud = simple_strtoul(options, NULL, 10);
- while (*s >= '0' && *s <= '9')
- s++;
- if (*s)
- parity = *s++;
- if (*s)
- bits = *s - '0';
- }
-
- /*
- * Now construct a cflag setting.
- */
- switch (baud) {
- case 1200:
- cflag |= B1200;
- break;
- case 2400:
- cflag |= B2400;
- break;
- case 4800:
- cflag |= B4800;
- break;
- case 9600:
- cflag |= B9600;
- break;
- case 19200:
- cflag |= B19200;
- break;
- case 38400:
- cflag |= B38400;
- break;
- case 57600:
- cflag |= B57600;
- break;
- case 115200:
- cflag |= B115200;
- break;
- default:
- cflag |= B9600;
- break;
- }
- switch (bits) {
- case 7:
- cflag |= CS7;
- break;
- default:
- cflag |= CS8;
- break;
- }
- switch (parity) {
- case 'o':
- case 'O':
- cflag |= PARODD;
- break;
- case 'e':
- case 'E':
- cflag |= PARENB;
- break;
- }
- co->cflag = cflag;
- rs285_set_cflag(cflag);
- rs285_console_write(NULL, "\e[2J\e[Hboot ", 12);
- if (options)
- rs285_console_write(NULL, options, strlen(options));
- else
- rs285_console_write(NULL, "no options", 10);
- rs285_console_write(NULL, "\n", 1);
-
- return 0;
-}
-
-static struct console rs285_cons =
-{
- name: SERIAL_21285_NAME,
- write: rs285_console_write,
- device: rs285_console_device,
- setup: rs285_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
-};
-
-void __init rs285_console_init(void)
-{
- register_console(&rs285_cons);
-}
-
-#endif /* CONFIG_SERIAL_21285_CONSOLE */
-
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * linux/drivers/char/serial_amba.c
- *
- * Driver for AMBA 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
- *
- *
- * This is a generic driver for ARM AMBA-type serial ports. They
- * have a lot of 16550-like features, but are not register compatable.
- * Note that although they do have CTS, DCD and DSR inputs, they do
- * not have an RI input, nor do they have DTR or RTS outputs. If
- * required, these have to be supplied via some other means (eg, GPIO)
- * and hooked into this driver.
- *
- * This could very easily become a generic serial driver for dumb UARTs
- * (eg, {82,16x}50, 21285, SA1100).
- */
-
-#include <linux/config.h>
-#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/console.h>
-#include <linux/sysrq.h>
-
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-#include <asm/bitops.h>
-
-#include <asm/hardware/serial_amba.h>
-
-#define SERIAL_AMBA_NAME "ttyAM"
-#define SERIAL_AMBA_MAJOR 204
-#define SERIAL_AMBA_MINOR 16
-#define SERIAL_AMBA_NR 2
-
-#define CALLOUT_AMBA_NAME "cuaam"
-#define CALLOUT_AMBA_MAJOR 205
-#define CALLOUT_AMBA_MINOR 16
-#define CALLOUT_AMBA_NR SERIAL_AMBA_NR
-
-#ifndef TRUE
-#define TRUE 1
-#endif
-#ifndef FALSE
-#define FALSE 0
-#endif
-
-#define DEBUG 0
-#define DEBUG_LEDS 0
-
-#if DEBUG_LEDS
-extern int get_leds(void);
-extern int set_leds(int);
-#endif
-
-/*
- * Access routines for the AMBA UARTs
- */
-#define UART_GET_INT_STATUS(p) IO_READ((p)->uart_base + AMBA_UARTIIR)
-#define UART_GET_FR(p) IO_READ((p)->uart_base + AMBA_UARTFR)
-#define UART_GET_CHAR(p) IO_READ((p)->uart_base + AMBA_UARTDR)
-#define UART_PUT_CHAR(p, c) IO_WRITE((p)->uart_base + AMBA_UARTDR, (c))
-#define UART_GET_RSR(p) IO_READ((p)->uart_base + AMBA_UARTRSR)
-#define UART_GET_CR(p) IO_READ((p)->uart_base + AMBA_UARTCR)
-#define UART_PUT_CR(p,c) IO_WRITE((p)->uart_base + AMBA_UARTCR, (c))
-#define UART_GET_LCRL(p) IO_READ((p)->uart_base + AMBA_UARTLCR_L)
-#define UART_PUT_LCRL(p,c) IO_WRITE((p)->uart_base + AMBA_UARTLCR_L, (c))
-#define UART_GET_LCRM(p) IO_READ((p)->uart_base + AMBA_UARTLCR_M)
-#define UART_PUT_LCRM(p,c) IO_WRITE((p)->uart_base + AMBA_UARTLCR_M, (c))
-#define UART_GET_LCRH(p) IO_READ((p)->uart_base + AMBA_UARTLCR_H)
-#define UART_PUT_LCRH(p,c) IO_WRITE((p)->uart_base + AMBA_UARTLCR_H, (c))
-#define UART_RX_DATA(s) (((s) & AMBA_UARTFR_RXFE) == 0)
-#define UART_TX_READY(s) (((s) & AMBA_UARTFR_TXFF) == 0)
-#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & AMBA_UARTFR_TMSK) == 0)
-
-#define AMBA_UARTRSR_ANY (AMBA_UARTRSR_OE|AMBA_UARTRSR_BE|AMBA_UARTRSR_PE|AMBA_UARTRSR_FE)
-#define AMBA_UARTFR_MODEM_ANY (AMBA_UARTFR_DCD|AMBA_UARTFR_DSR|AMBA_UARTFR_CTS)
-
-/*
- * Things needed by tty driver
- */
-static struct tty_driver ambanormal_driver, ambacallout_driver;
-static int ambauart_refcount;
-static struct tty_struct *ambauart_table[SERIAL_AMBA_NR];
-static struct termios *ambauart_termios[SERIAL_AMBA_NR];
-static struct termios *ambauart_termios_locked[SERIAL_AMBA_NR];
-
-#if defined(CONFIG_SERIAL_AMBA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-/*
- * Things needed internally to this driver
- */
-
-/*
- * tmp_buf is used as a temporary buffer by serial_write. We need to
- * lock it in case the copy_from_user blocks while swapping in a page,
- * and some other program tries to do a serial write at the same time.
- * Since the lock will only come under contention when the system is
- * swapping and available memory is low, it makes sense to share one
- * buffer across all the serial ports, since it significantly saves
- * memory if large numbers of serial ports are open.
- */
-static u_char *tmp_buf;
-static DECLARE_MUTEX(tmp_buf_sem);
-
-#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
-
-/* number of characters left in xmit buffer before we ask for more */
-#define WAKEUP_CHARS 256
-#define AMBA_ISR_PASS_LIMIT 256
-
-#define EVT_WRITE_WAKEUP 0
-
-struct amba_icount {
- __u32 cts;
- __u32 dsr;
- __u32 rng;
- __u32 dcd;
- __u32 rx;
- __u32 tx;
- __u32 frame;
- __u32 overrun;
- __u32 parity;
- __u32 brk;
- __u32 buf_overrun;
-};
-
-/*
- * Static information about the port
- */
-struct amba_port {
- unsigned int uart_base;
- unsigned int irq;
- unsigned int uartclk;
- unsigned int fifosize;
- unsigned int tiocm_support;
- void (*set_mctrl)(struct amba_port *, u_int mctrl);
-};
-
-/*
- * This is the state information which is persistent across opens
- */
-struct amba_state {
- struct amba_icount icount;
- unsigned int line;
- unsigned int close_delay;
- unsigned int closing_wait;
- unsigned int custom_divisor;
- unsigned int flags;
- struct termios normal_termios;
- struct termios callout_termios;
-
- int count;
- struct amba_info *info;
-};
-
-#define AMBA_XMIT_SIZE 1024
-/*
- * This is the state information which is only valid when the port is open.
- */
-struct amba_info {
- struct amba_port *port;
- struct amba_state *state;
- struct tty_struct *tty;
- unsigned char x_char;
- unsigned char old_status;
- unsigned char read_status_mask;
- unsigned char ignore_status_mask;
- struct circ_buf xmit;
- unsigned int flags;
-#ifdef SUPPORT_SYSRQ
- unsigned long sysrq;
-#endif
-
- unsigned int event;
- unsigned int timeout;
- unsigned int lcr_h;
- unsigned int mctrl;
- int blocked_open;
- pid_t session;
- pid_t pgrp;
-
- struct tasklet_struct tlet;
-
- wait_queue_head_t open_wait;
- wait_queue_head_t close_wait;
- wait_queue_head_t delta_msr_wait;
-};
-
-#ifdef CONFIG_SERIAL_AMBA_CONSOLE
-static struct console ambauart_cons;
-#endif
-static void ambauart_change_speed(struct amba_info *info, struct termios *old_termios);
-static void ambauart_wait_until_sent(struct tty_struct *tty, int timeout);
-
-#if 1 //def CONFIG_SERIAL_INTEGRATOR
-static void amba_set_mctrl_null(struct amba_port *port, u_int mctrl)
-{
-}
-
-static struct amba_port amba_ports[SERIAL_AMBA_NR] = {
- {
- uart_base: IO_ADDRESS(INTEGRATOR_UART0_BASE),
- irq: IRQ_UARTINT0,
- uartclk: 14745600,
- fifosize: 8,
- set_mctrl: amba_set_mctrl_null,
- },
- {
- uart_base: IO_ADDRESS(INTEGRATOR_UART1_BASE),
- irq: IRQ_UARTINT1,
- uartclk: 14745600,
- fifosize: 8,
- set_mctrl: amba_set_mctrl_null,
- }
-};
-#endif
-
-static struct amba_state amba_state[SERIAL_AMBA_NR];
-
-static void ambauart_enable_rx_interrupt(struct amba_info *info)
-{
- unsigned int cr;
-
- cr = UART_GET_CR(info->port);
- cr |= AMBA_UARTCR_RIE | AMBA_UARTCR_RTIE;
- UART_PUT_CR(info->port, cr);
-}
-
-static void ambauart_disable_rx_interrupt(struct amba_info *info)
-{
- unsigned int cr;
-
- cr = UART_GET_CR(info->port);
- cr &= ~(AMBA_UARTCR_RIE | AMBA_UARTCR_RTIE);
- UART_PUT_CR(info->port, cr);
-}
-
-static void ambauart_enable_tx_interrupt(struct amba_info *info)
-{
- unsigned int cr;
-
- cr = UART_GET_CR(info->port);
- cr |= AMBA_UARTCR_TIE;
- UART_PUT_CR(info->port, cr);
-}
-
-static void ambauart_disable_tx_interrupt(struct amba_info *info)
-{
- unsigned int cr;
-
- cr = UART_GET_CR(info->port);
- cr &= ~AMBA_UARTCR_TIE;
- UART_PUT_CR(info->port, cr);
-}
-
-static void ambauart_stop(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
-
- save_flags(flags); cli();
- ambauart_disable_tx_interrupt(info);
- restore_flags(flags);
-}
-
-static void ambauart_start(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
-
- save_flags(flags); cli();
- if (info->xmit.head != info->xmit.tail
- && info->xmit.buf)
- ambauart_enable_tx_interrupt(info);
- restore_flags(flags);
-}
-
-
-/*
- * This routine is used by the interrupt handler to schedule
- * processing in the software interrupt portion of the driver.
- */
-static void ambauart_event(struct amba_info *info, int event)
-{
- info->event |= 1 << event;
- tasklet_schedule(&info->tlet);
-}
-
-static void
-#ifdef SUPPORT_SYSRQ
-ambauart_rx_chars(struct amba_info *info, struct pt_regs *regs)
-#else
-ambauart_rx_chars(struct amba_info *info)
-#endif
-{
- struct tty_struct *tty = info->tty;
- unsigned int status, ch, rsr, flg, ignored = 0;
- struct amba_icount *icount = &info->state->icount;
- struct amba_port *port = info->port;
-
- status = UART_GET_FR(port);
- while (UART_RX_DATA(status)) {
- ch = UART_GET_CHAR(port);
-
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- goto ignore_char;
- icount->rx++;
-
- flg = TTY_NORMAL;
-
- /*
- * Note that the error handling code is
- * out of the main execution path
- */
- rsr = UART_GET_RSR(port);
- if (rsr & AMBA_UARTRSR_ANY)
- goto handle_error;
-#ifdef SUPPORT_SYSRQ
- if (info->sysrq) {
- if (ch && time_before(jiffies, info->sysrq)) {
- handle_sysrq(ch, regs, NULL, NULL);
- info->sysrq = 0;
- goto ignore_char;
- }
- info->sysrq = 0;
- }
-#endif
- error_return:
- *tty->flip.flag_buf_ptr++ = flg;
- *tty->flip.char_buf_ptr++ = ch;
- tty->flip.count++;
- ignore_char:
- status = UART_GET_FR(port);
- }
-out:
- tty_flip_buffer_push(tty);
- return;
-
-handle_error:
- if (rsr & AMBA_UARTRSR_BE) {
- rsr &= ~(AMBA_UARTRSR_FE | AMBA_UARTRSR_PE);
- icount->brk++;
-
-#ifdef SUPPORT_SYSRQ
- if (info->state->line == ambauart_cons.index) {
- if (!info->sysrq) {
- info->sysrq = jiffies + HZ*5;
- goto ignore_char;
- }
- }
-#endif
- } else if (rsr & AMBA_UARTRSR_PE)
- icount->parity++;
- else if (rsr & AMBA_UARTRSR_FE)
- icount->frame++;
- if (rsr & AMBA_UARTRSR_OE)
- icount->overrun++;
-
- if (rsr & info->ignore_status_mask) {
- if (++ignored > 100)
- goto out;
- goto ignore_char;
- }
- rsr &= info->read_status_mask;
-
- if (rsr & AMBA_UARTRSR_BE)
- flg = TTY_BREAK;
- else if (rsr & AMBA_UARTRSR_PE)
- flg = TTY_PARITY;
- else if (rsr & AMBA_UARTRSR_FE)
- flg = TTY_FRAME;
-
- if (rsr & AMBA_UARTRSR_OE) {
- /*
- * CHECK: does overrun affect the current character?
- * ASSUMPTION: it does not.
- */
- *tty->flip.flag_buf_ptr++ = flg;
- *tty->flip.char_buf_ptr++ = ch;
- tty->flip.count++;
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- goto ignore_char;
- ch = 0;
- flg = TTY_OVERRUN;
- }
-#ifdef SUPPORT_SYSRQ
- info->sysrq = 0;
-#endif
- goto error_return;
-}
-
-static void ambauart_tx_chars(struct amba_info *info)
-{
- struct amba_port *port = info->port;
- int count;
-
- if (info->x_char) {
- UART_PUT_CHAR(port, info->x_char);
- info->state->icount.tx++;
- info->x_char = 0;
- return;
- }
- if (info->xmit.head == info->xmit.tail
- || info->tty->stopped
- || info->tty->hw_stopped) {
- ambauart_disable_tx_interrupt(info);
- return;
- }
-
- count = port->fifosize;
- do {
- UART_PUT_CHAR(port, info->xmit.buf[info->xmit.tail]);
- info->xmit.tail = (info->xmit.tail + 1) & (AMBA_XMIT_SIZE - 1);
- info->state->icount.tx++;
- if (info->xmit.head == info->xmit.tail)
- break;
- } while (--count > 0);
-
- if (CIRC_CNT(info->xmit.head,
- info->xmit.tail,
- AMBA_XMIT_SIZE) < WAKEUP_CHARS)
- ambauart_event(info, EVT_WRITE_WAKEUP);
-
- if (info->xmit.head == info->xmit.tail) {
- ambauart_disable_tx_interrupt(info);
- }
-}
-
-static void ambauart_modem_status(struct amba_info *info)
-{
- unsigned int status, delta;
- struct amba_icount *icount = &info->state->icount;
-
- status = UART_GET_FR(info->port) & AMBA_UARTFR_MODEM_ANY;
-
- delta = status ^ info->old_status;
- info->old_status = status;
-
- if (!delta)
- return;
-
- if (delta & AMBA_UARTFR_DCD) {
- icount->dcd++;
-#ifdef CONFIG_HARD_PPS
- if ((info->flags & ASYNC_HARDPPS_CD) &&
- (status & AMBA_UARTFR_DCD)
- hardpps();
-#endif
- if (info->flags & ASYNC_CHECK_CD) {
- if (status & AMBA_UARTFR_DCD)
- wake_up_interruptible(&info->open_wait);
- else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_CALLOUT_NOHUP))) {
- if (info->tty)
- tty_hangup(info->tty);
- }
- }
- }
-
- if (delta & AMBA_UARTFR_DSR)
- icount->dsr++;
-
- if (delta & AMBA_UARTFR_CTS) {
- icount->cts++;
-
- if (info->flags & ASYNC_CTS_FLOW) {
- status &= AMBA_UARTFR_CTS;
-
- if (info->tty->hw_stopped) {
- if (status) {
- info->tty->hw_stopped = 0;
- ambauart_enable_tx_interrupt(info);
- ambauart_event(info, EVT_WRITE_WAKEUP);
- }
- } else {
- if (!status) {
- info->tty->hw_stopped = 1;
- ambauart_disable_tx_interrupt(info);
- }
- }
- }
- }
- wake_up_interruptible(&info->delta_msr_wait);
-
-}
-
-static void ambauart_int(int irq, void *dev_id, struct pt_regs *regs)
-{
- struct amba_info *info = dev_id;
- unsigned int status, pass_counter = 0;
-
-#if DEBUG_LEDS
- // tell the world
- set_leds(get_leds() | RED_LED);
-#endif
-
- status = UART_GET_INT_STATUS(info->port);
- do {
- /*
- * FIXME: what about clearing the interrupts?
- */
-
- if (status & (AMBA_UARTIIR_RTIS | AMBA_UARTIIR_RIS))
-#ifdef SUPPORT_SYSRQ
- ambauart_rx_chars(info, regs);
-#else
- ambauart_rx_chars(info);
-#endif
- if (status & AMBA_UARTIIR_TIS)
- ambauart_tx_chars(info);
- if (status & AMBA_UARTIIR_MIS)
- ambauart_modem_status(info);
- if (pass_counter++ > AMBA_ISR_PASS_LIMIT)
- break;
-
- status = UART_GET_INT_STATUS(info->port);
- } while (status & (AMBA_UARTIIR_RTIS | AMBA_UARTIIR_RIS | AMBA_UARTIIR_TIS));
-
-#if DEBUG_LEDS
- // tell the world
- set_leds(get_leds() & ~RED_LED);
-#endif
-}
-
-static void ambauart_tasklet_action(unsigned long data)
-{
- struct amba_info *info = (struct amba_info *)data;
- struct tty_struct *tty;
-
- tty = info->tty;
- if (!tty || !test_and_clear_bit(EVT_WRITE_WAKEUP, &info->event))
- return;
-
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_wakeup)(tty);
- wake_up_interruptible(&tty->write_wait);
-}
-
-static int ambauart_startup(struct amba_info *info)
-{
- unsigned long flags;
- unsigned long page;
- int retval = 0;
-
- page = get_zeroed_page(GFP_KERNEL);
- if (!page)
- return -ENOMEM;
-
- save_flags(flags); cli();
-
- if (info->flags & ASYNC_INITIALIZED) {
- free_page(page);
- goto errout;
- }
-
- if (info->xmit.buf)
- free_page(page);
- else
- info->xmit.buf = (unsigned char *) page;
-
- /*
- * Allocate the IRQ
- */
- retval = request_irq(info->port->irq, ambauart_int, 0, "amba", info);
- if (retval) {
- if (capable(CAP_SYS_ADMIN)) {
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
- retval = 0;
- }
- goto errout;
- }
-
- info->mctrl = 0;
- if (info->tty->termios->c_cflag & CBAUD)
- info->mctrl = TIOCM_RTS | TIOCM_DTR;
- info->port->set_mctrl(info->port, info->mctrl);
-
- /*
- * initialise the old status of the modem signals
- */
- info->old_status = UART_GET_FR(info->port) & AMBA_UARTFR_MODEM_ANY;
-
- /*
- * Finally, enable interrupts
- */
- ambauart_enable_rx_interrupt(info);
-
- if (info->tty)
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- info->xmit.head = info->xmit.tail = 0;
-
- /*
- * Set up the tty->alt_speed kludge
- */
- if (info->tty) {
- if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- info->tty->alt_speed = 57600;
- if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- info->tty->alt_speed = 115200;
- if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- info->tty->alt_speed = 230400;
- if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- info->tty->alt_speed = 460800;
- }
-
- /*
- * and set the speed of the serial port
- */
- ambauart_change_speed(info, 0);
-
- info->flags |= ASYNC_INITIALIZED;
- restore_flags(flags);
- return 0;
-
-errout:
- restore_flags(flags);
- return retval;
-}
-
-/*
- * This routine will shutdown a serial port; interrupts are disabled, and
- * DTR is dropped if the hangup on close termio flag is on.
- */
-static void ambauart_shutdown(struct amba_info *info)
-{
- unsigned long flags;
-
- if (!(info->flags & ASYNC_INITIALIZED))
- return;
-
- save_flags(flags); cli(); /* Disable interrupts */
-
- /*
- * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
- * here so the queue might never be woken up
- */
- wake_up_interruptible(&info->delta_msr_wait);
-
- /*
- * Free the IRQ
- */
- free_irq(info->port->irq, info);
-
- if (info->xmit.buf) {
- unsigned long pg = (unsigned long) info->xmit.buf;
- info->xmit.buf = NULL;
- free_page(pg);
- }
-
- /*
- * disable all interrupts, disable the port
- */
- UART_PUT_CR(info->port, 0);
-
- /* disable break condition and fifos */
- UART_PUT_LCRH(info->port, UART_GET_LCRH(info->port) &
- ~(AMBA_UARTLCR_H_BRK | AMBA_UARTLCR_H_FEN));
-
- if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
- info->mctrl &= ~(TIOCM_DTR|TIOCM_RTS);
- info->port->set_mctrl(info->port, info->mctrl);
-
- /* kill off our tasklet */
- tasklet_kill(&info->tlet);
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
-
- info->flags &= ~ASYNC_INITIALIZED;
- restore_flags(flags);
-}
-
-static void ambauart_change_speed(struct amba_info *info, struct termios *old_termios)
-{
- unsigned int lcr_h, baud, quot, cflag, old_cr, bits;
- unsigned long flags;
-
- if (!info->tty || !info->tty->termios)
- return;
-
- cflag = info->tty->termios->c_cflag;
-
-#if DEBUG
- printk("ambauart_set_cflag(0x%x) called\n", cflag);
-#endif
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS5: lcr_h = AMBA_UARTLCR_H_WLEN_5; bits = 7; break;
- case CS6: lcr_h = AMBA_UARTLCR_H_WLEN_6; bits = 8; break;
- case CS7: lcr_h = AMBA_UARTLCR_H_WLEN_7; bits = 9; break;
- default: lcr_h = AMBA_UARTLCR_H_WLEN_8; bits = 10; break; // CS8
- }
- if (cflag & CSTOPB) {
- lcr_h |= AMBA_UARTLCR_H_STP2;
- bits ++;
- }
- if (cflag & PARENB) {
- lcr_h |= AMBA_UARTLCR_H_PEN;
- bits++;
- if (!(cflag & PARODD))
- lcr_h |= AMBA_UARTLCR_H_EPS;
- }
- if (info->port->fifosize > 1)
- lcr_h |= AMBA_UARTLCR_H_FEN;
-
- do {
- /* Determine divisor based on baud rate */
- baud = tty_get_baud_rate(info->tty);
- if (!baud)
- baud = 9600;
-
- if (baud == 38400 &&
- ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
- quot = info->state->custom_divisor;
- else
- quot = (info->port->uartclk / (16 * baud)) - 1;
-
- if (!quot && old_termios) {
- info->tty->termios->c_cflag &= ~CBAUD;
- info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
- old_termios = NULL;
- }
- } while (quot == 0 && old_termios);
-
- /* As a last resort, if the quotient is zero, default to 9600 bps */
- if (!quot)
- quot = (info->port->uartclk / (16 * 9600)) - 1;
-
- info->timeout = (info->port->fifosize * HZ * bits * quot) /
- (info->port->uartclk / 16);
- info->timeout += HZ/50; /* Add .02 seconds of slop */
-
- if (cflag & CRTSCTS)
- info->flags |= ASYNC_CTS_FLOW;
- else
- info->flags &= ~ASYNC_CTS_FLOW;
- if (cflag & CLOCAL)
- info->flags &= ~ASYNC_CHECK_CD;
- else
- info->flags |= ASYNC_CHECK_CD;
-
- /*
- * Set up parity check flag
- */
-#define RELEVENT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
-
- info->read_status_mask = AMBA_UARTRSR_OE;
- if (I_INPCK(info->tty))
- info->read_status_mask |= AMBA_UARTRSR_FE | AMBA_UARTRSR_PE;
- if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
- info->read_status_mask |= AMBA_UARTRSR_BE;
-
- /*
- * Characters to ignore
- */
- info->ignore_status_mask = 0;
- if (I_IGNPAR(info->tty))
- info->ignore_status_mask |= AMBA_UARTRSR_FE | AMBA_UARTRSR_PE;
- if (I_IGNBRK(info->tty)) {
- info->ignore_status_mask |= AMBA_UARTRSR_BE;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns to (for real raw support).
- */
- if (I_IGNPAR(info->tty))
- info->ignore_status_mask |= AMBA_UARTRSR_OE;
- }
-
- /* first, disable everything */
- save_flags(flags); cli();
- old_cr = UART_GET_CR(info->port) &= ~AMBA_UARTCR_MSIE;
-
- if ((info->flags & ASYNC_HARDPPS_CD) ||
- (cflag & CRTSCTS) ||
- !(cflag & CLOCAL))
- old_cr |= AMBA_UARTCR_MSIE;
-
- UART_PUT_CR(info->port, 0);
- restore_flags(flags);
-
- /* Set baud rate */
- UART_PUT_LCRM(info->port, ((quot & 0xf00) >> 8));
- UART_PUT_LCRL(info->port, (quot & 0xff));
-
- /*
- * ----------v----------v----------v----------v-----
- * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
- * ----------^----------^----------^----------^-----
- */
- UART_PUT_LCRH(info->port, lcr_h);
- UART_PUT_CR(info->port, old_cr);
-}
-
-static void ambauart_put_char(struct tty_struct *tty, u_char ch)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
-
- if (!tty || !info->xmit.buf)
- return;
-
- save_flags(flags); cli();
- if (CIRC_SPACE(info->xmit.head, info->xmit.tail, AMBA_XMIT_SIZE) != 0) {
- info->xmit.buf[info->xmit.head] = ch;
- info->xmit.head = (info->xmit.head + 1) & (AMBA_XMIT_SIZE - 1);
- }
- restore_flags(flags);
-}
-
-static void ambauart_flush_chars(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
-
- if (info->xmit.head == info->xmit.tail
- || tty->stopped
- || tty->hw_stopped
- || !info->xmit.buf)
- return;
-
- save_flags(flags); cli();
- ambauart_enable_tx_interrupt(info);
- restore_flags(flags);
-}
-
-static int ambauart_write(struct tty_struct *tty, int from_user,
- const u_char * buf, int count)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
- int c, ret = 0;
-
- if (!tty || !info->xmit.buf || !tmp_buf)
- return 0;
-
- save_flags(flags);
- if (from_user) {
- down(&tmp_buf_sem);
- while (1) {
- int c1;
- c = CIRC_SPACE_TO_END(info->xmit.head,
- info->xmit.tail,
- AMBA_XMIT_SIZE);
- if (count < c)
- c = count;
- if (c <= 0)
- break;
-
- c -= copy_from_user(tmp_buf, buf, c);
- if (!c) {
- if (!ret)
- ret = -EFAULT;
- break;
- }
- cli();
- c1 = CIRC_SPACE_TO_END(info->xmit.head,
- info->xmit.tail,
- AMBA_XMIT_SIZE);
- if (c1 < c)
- c = c1;
- memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
- info->xmit.head = (info->xmit.head + c) &
- (AMBA_XMIT_SIZE - 1);
- restore_flags(flags);
- buf += c;
- count -= c;
- ret += c;
- }
- up(&tmp_buf_sem);
- } else {
- cli();
- while (1) {
- c = CIRC_SPACE_TO_END(info->xmit.head,
- info->xmit.tail,
- AMBA_XMIT_SIZE);
- if (count < c)
- c = count;
- if (c <= 0)
- break;
- memcpy(info->xmit.buf + info->xmit.head, buf, c);
- info->xmit.head = (info->xmit.head + c) &
- (AMBA_XMIT_SIZE - 1);
- buf += c;
- count -= c;
- ret += c;
- }
- restore_flags(flags);
- }
- if (info->xmit.head != info->xmit.tail
- && !tty->stopped
- && !tty->hw_stopped)
- ambauart_enable_tx_interrupt(info);
- return ret;
-}
-
-static int ambauart_write_room(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
-
- return CIRC_SPACE(info->xmit.head, info->xmit.tail, AMBA_XMIT_SIZE);
-}
-
-static int ambauart_chars_in_buffer(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
-
- return CIRC_CNT(info->xmit.head, info->xmit.tail, AMBA_XMIT_SIZE);
-}
-
-static void ambauart_flush_buffer(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
-
-#if DEBUG
- printk("ambauart_flush_buffer(%d) called\n",
- minor(tty->device) - tty->driver.minor_start);
-#endif
- save_flags(flags); cli();
- info->xmit.head = info->xmit.tail = 0;
- restore_flags(flags);
- wake_up_interruptible(&tty->write_wait);
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_wakeup)(tty);
-}
-
-/*
- * This function is used to send a high-priority XON/XOFF character to
- * the device
- */
-static void ambauart_send_xchar(struct tty_struct *tty, char ch)
-{
- struct amba_info *info = tty->driver_data;
-
- info->x_char = ch;
- if (ch)
- ambauart_enable_tx_interrupt(info);
-}
-
-static void ambauart_throttle(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
-
- if (I_IXOFF(tty))
- ambauart_send_xchar(tty, STOP_CHAR(tty));
-
- if (tty->termios->c_cflag & CRTSCTS) {
- save_flags(flags); cli();
- info->mctrl &= ~TIOCM_RTS;
- info->port->set_mctrl(info->port, info->mctrl);
- restore_flags(flags);
- }
-}
-
-static void ambauart_unthrottle(struct tty_struct *tty)
-{
- struct amba_info *info = (struct amba_info *) tty->driver_data;
- unsigned long flags;
-
- if (I_IXOFF(tty)) {
- if (info->x_char)
- info->x_char = 0;
- else
- ambauart_send_xchar(tty, START_CHAR(tty));
- }
-
- if (tty->termios->c_cflag & CRTSCTS) {
- save_flags(flags); cli();
- info->mctrl |= TIOCM_RTS;
- info->port->set_mctrl(info->port, info->mctrl);
- restore_flags(flags);
- }
-}
-
-static int get_serial_info(struct amba_info *info, struct serial_struct *retinfo)
-{
- struct amba_state *state = info->state;
- struct amba_port *port = info->port;
- struct serial_struct tmp;
-
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = 0;
- tmp.line = state->line;
- tmp.port = port->uart_base;
- if (HIGH_BITS_OFFSET)
- tmp.port_high = port->uart_base >> HIGH_BITS_OFFSET;
- tmp.irq = port->irq;
- tmp.flags = 0;
- tmp.xmit_fifo_size = port->fifosize;
- tmp.baud_base = port->uartclk / 16;
- tmp.close_delay = state->close_delay;
- tmp.closing_wait = state->closing_wait;
- tmp.custom_divisor = state->custom_divisor;
-
- if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
- return -EFAULT;
- return 0;
-}
-
-static int set_serial_info(struct amba_info *info,
- struct serial_struct *newinfo)
-{
- struct serial_struct new_serial;
- struct amba_state *state, old_state;
- struct amba_port *port;
- unsigned long new_port;
- unsigned int i, change_irq, change_port;
- int retval = 0;
-
- if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
- return -EFAULT;
-
- state = info->state;
- old_state = *state;
- port = info->port;
-
- new_port = new_serial.port;
- if (HIGH_BITS_OFFSET)
- new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
-
- change_irq = new_serial.irq != port->irq;
- change_port = new_port != port->uart_base;
-
- if (!capable(CAP_SYS_ADMIN)) {
- if (change_irq || change_port ||
- (new_serial.baud_base != port->uartclk / 16) ||
- (new_serial.close_delay != state->close_delay) ||
- (new_serial.xmit_fifo_size != port->fifosize) ||
- ((new_serial.flags & ~ASYNC_USR_MASK) !=
- (state->flags & ~ASYNC_USR_MASK)))
- return -EPERM;
- state->flags = ((state->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- info->flags = ((info->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- state->custom_divisor = new_serial.custom_divisor;
- goto check_and_exit;
- }
-
- if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
- (new_serial.baud_base < 9600))
- return -EINVAL;
-
- if (new_serial.type && change_port) {
- for (i = 0; i < SERIAL_AMBA_NR; i++)
- if ((port != amba_ports + i) &&
- amba_ports[i].uart_base != new_port)
- return -EADDRINUSE;
- }
-
- if ((change_port || change_irq) && (state->count > 1))
- return -EBUSY;
-
- /*
- * OK, past this point, all the error checking has been done.
- * At this point, we start making changes.....
- */
- port->uartclk = new_serial.baud_base * 16;
- state->flags = ((state->flags & ~ASYNC_FLAGS) |
- (new_serial.flags & ASYNC_FLAGS));
- info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
- (info->flags & ASYNC_INTERNAL_FLAGS));
- state->custom_divisor = new_serial.custom_divisor;
- state->close_delay = new_serial.close_delay * HZ / 100;
- state->closing_wait = new_serial.closing_wait * HZ / 100;
- info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
- port->fifosize = new_serial.xmit_fifo_size;
-
- if (change_port || change_irq) {
- /*
- * We need to shutdown the serial port at the old
- * port/irq combination.
- */
- ambauart_shutdown(info);
- port->irq = new_serial.irq;
- port->uart_base = new_port;
- }
-
-check_and_exit:
- if (!port->uart_base)
- return 0;
- if (info->flags & ASYNC_INITIALIZED) {
- if ((old_state.flags & ASYNC_SPD_MASK) !=
- (state->flags & ASYNC_SPD_MASK) ||
- (old_state.custom_divisor != state->custom_divisor)) {
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- info->tty->alt_speed = 57600;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- info->tty->alt_speed = 115200;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- info->tty->alt_speed = 230400;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- info->tty->alt_speed = 460800;
- ambauart_change_speed(info, NULL);
- }
- } else
- retval = ambauart_startup(info);
- return retval;
-}
-
-
-/*
- * get_lsr_info - get line status register info
- */
-static int get_lsr_info(struct amba_info *info, unsigned int *value)
-{
- unsigned int result, status;
- unsigned long flags;
-
- save_flags(flags); cli();
- status = UART_GET_FR(info->port);
- restore_flags(flags);
- result = status & AMBA_UARTFR_BUSY ? TIOCSER_TEMT : 0;
-
- /*
- * If we're about to load something into the transmit
- * register, we'll pretend the transmitter isn't empty to
- * avoid a race condition (depending on when the transmit
- * interrupt happens).
- */
- if (info->x_char ||
- ((CIRC_CNT(info->xmit.head, info->xmit.tail,
- AMBA_XMIT_SIZE) > 0) &&
- !info->tty->stopped && !info->tty->hw_stopped))
- result &= TIOCSER_TEMT;
-
- return put_user(result, value);
-}
-
-static int get_modem_info(struct amba_info *info, unsigned int *value)
-{
- unsigned int result = info->mctrl;
- unsigned int status;
-
- status = UART_GET_FR(info->port);
- if (status & AMBA_UARTFR_DCD)
- result |= TIOCM_CAR;
- if (status & AMBA_UARTFR_DSR)
- result |= TIOCM_DSR;
- if (status & AMBA_UARTFR_CTS)
- result |= TIOCM_CTS;
-
- return put_user(result, value);
-}
-
-static int set_modem_info(struct amba_info *info, unsigned int cmd,
- unsigned int *value)
-{
- unsigned int arg, old;
- unsigned long flags;
-
- if (get_user(arg, value))
- return -EFAULT;
-
- old = info->mctrl;
- switch (cmd) {
- case TIOCMBIS:
- info->mctrl |= arg;
- break;
-
- case TIOCMBIC:
- info->mctrl &= ~arg;
- break;
-
- case TIOCMSET:
- info->mctrl = arg;
- break;
-
- default:
- return -EINVAL;
- }
- save_flags(flags); cli();
- if (old != info->mctrl)
- info->port->set_mctrl(info->port, info->mctrl);
- restore_flags(flags);
- return 0;
-}
-
-static void ambauart_break_ctl(struct tty_struct *tty, int break_state)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
- unsigned int lcr_h;
-
- save_flags(flags); cli();
- lcr_h = UART_GET_LCRH(info->port);
- if (break_state == -1)
- lcr_h |= AMBA_UARTLCR_H_BRK;
- else
- lcr_h &= ~AMBA_UARTLCR_H_BRK;
- UART_PUT_LCRH(info->port, lcr_h);
- restore_flags(flags);
-}
-
-static int ambauart_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- struct amba_info *info = tty->driver_data;
- struct amba_icount cprev, cnow;
- struct serial_icounter_struct icount;
- unsigned long flags;
-
- if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
- (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
- (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
- }
-
- switch (cmd) {
- case TIOCMGET:
- return get_modem_info(info, (unsigned int *)arg);
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMSET:
- return set_modem_info(info, cmd, (unsigned int *)arg);
- case TIOCGSERIAL:
- return get_serial_info(info,
- (struct serial_struct *)arg);
- case TIOCSSERIAL:
- return set_serial_info(info,
- (struct serial_struct *)arg);
- case TIOCSERGETLSR: /* Get line status register */
- return get_lsr_info(info, (unsigned int *)arg);
- /*
- * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
- * - mask passed in arg for lines of interest
- * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
- * Caller should use TIOCGICOUNT to see which one it was
- */
- case TIOCMIWAIT:
- save_flags(flags); cli();
- /* note the counters on entry */
- cprev = info->state->icount;
- /* Force modem status interrupts on */
- UART_PUT_CR(info->port, UART_GET_CR(info->port) | AMBA_UARTCR_MSIE);
- restore_flags(flags);
- while (1) {
- interruptible_sleep_on(&info->delta_msr_wait);
- /* see if a signal did it */
- if (signal_pending(current))
- return -ERESTARTSYS;
- save_flags(flags); cli();
- cnow = info->state->icount; /* atomic copy */
- restore_flags(flags);
- if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
- cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
- return -EIO; /* no change => error */
- if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
- ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
- ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
- ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
- return 0;
- }
- cprev = cnow;
- }
- /* NOTREACHED */
-
- /*
- * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
- * Return: write counters to the user passed counter struct
- * NB: both 1->0 and 0->1 transitions are counted except for
- * RI where only 0->1 is counted.
- */
- case TIOCGICOUNT:
- save_flags(flags); cli();
- cnow = info->state->icount;
- restore_flags(flags);
- icount.cts = cnow.cts;
- icount.dsr = cnow.dsr;
- icount.rng = cnow.rng;
- icount.dcd = cnow.dcd;
- icount.rx = cnow.rx;
- icount.tx = cnow.tx;
- icount.frame = cnow.frame;
- icount.overrun = cnow.overrun;
- icount.parity = cnow.parity;
- icount.brk = cnow.brk;
- icount.buf_overrun = cnow.buf_overrun;
-
- return copy_to_user((void *)arg, &icount, sizeof(icount))
- ? -EFAULT : 0;
-
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
-}
-
-static void ambauart_set_termios(struct tty_struct *tty, struct termios *old_termios)
-{
- struct amba_info *info = tty->driver_data;
- unsigned long flags;
- unsigned int cflag = tty->termios->c_cflag;
-
- if ((cflag ^ old_termios->c_cflag) == 0 &&
- RELEVENT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
- return;
-
- ambauart_change_speed(info, old_termios);
-
- /* Handle transition to B0 status */
- if ((old_termios->c_cflag & CBAUD) &&
- !(cflag & CBAUD)) {
- save_flags(flags); cli();
- info->mctrl &= ~(TIOCM_RTS | TIOCM_DTR);
- info->port->set_mctrl(info->port, info->mctrl);
- restore_flags(flags);
- }
-
- /* Handle transition away from B0 status */
- if (!(old_termios->c_cflag & CBAUD) &&
- (cflag & CBAUD)) {
- save_flags(flags); cli();
- info->mctrl |= TIOCM_DTR;
- if (!(cflag & CRTSCTS) ||
- !test_bit(TTY_THROTTLED, &tty->flags))
- info->mctrl |= TIOCM_RTS;
- info->port->set_mctrl(info->port, info->mctrl);
- restore_flags(flags);
- }
-
- /* Handle turning off CRTSCTS */
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(cflag & CRTSCTS)) {
- tty->hw_stopped = 0;
- ambauart_start(tty);
- }
-
-#if 0
- /*
- * No need to wake up processes in open wait, since they
- * sample the CLOCAL flag once, and don't recheck it.
- * XXX It's not clear whether the current behavior is correct
- * or not. Hence, this may change.....
- */
- if (!(old_termios->c_cflag & CLOCAL) &&
- (tty->termios->c_cflag & CLOCAL))
- wake_up_interruptible(&info->open_wait);
-#endif
-}
-
-static void ambauart_close(struct tty_struct *tty, struct file *filp)
-{
- struct amba_info *info = tty->driver_data;
- struct amba_state *state;
- unsigned long flags;
-
- if (!info)
- return;
-
- state = info->state;
-
-#if DEBUG
- printk("ambauart_close() called\n");
-#endif
-
- save_flags(flags); cli();
-
- if (tty_hung_up_p(filp)) {
- MOD_DEC_USE_COUNT;
- restore_flags(flags);
- return;
- }
-
- if ((tty->count == 1) && (state->count != 1)) {
- /*
- * Uh, oh. tty->count is 1, which means that the tty
- * structure will be freed. state->count should always
- * be one in these conditions. If it's greater than
- * one, we've got real problems, since it means the
- * serial port won't be shutdown.
- */
- printk("ambauart_close: bad serial port count; tty->count is 1, "
- "state->count is %d\n", state->count);
- state->count = 1;
- }
- if (--state->count < 0) {
- printk("rs_close: bad serial port count for %s%d: %d\n",
- tty->driver.name, info->state->line, state->count);
- state->count = 0;
- }
- if (state->count) {
- MOD_DEC_USE_COUNT;
- restore_flags(flags);
- return;
- }
- info->flags |= ASYNC_CLOSING;
- restore_flags(flags);
- /*
- * Save the termios structure, since this port may have
- * separate termios for callout and dialin.
- */
- if (info->flags & ASYNC_NORMAL_ACTIVE)
- info->state->normal_termios = *tty->termios;
- if (info->flags & ASYNC_CALLOUT_ACTIVE)
- info->state->callout_termios = *tty->termios;
- /*
- * Now we wait for the transmit buffer to clear; and we notify
- * the line discipline to only process XON/XOFF characters.
- */
- tty->closing = 1;
- if (info->state->closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, info->state->closing_wait);
- /*
- * At this point, we stop accepting input. To do this, we
- * disable the receive line status interrupts.
- */
- if (info->flags & ASYNC_INITIALIZED) {
- ambauart_disable_rx_interrupt(info);
- /*
- * Before we drop DTR, make sure the UART transmitter
- * has completely drained; this is especially
- * important if there is a transmit FIFO!
- */
- ambauart_wait_until_sent(tty, info->timeout);
- }
- ambauart_shutdown(info);
- if (tty->driver.flush_buffer)
- tty->driver.flush_buffer(tty);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- tty->closing = 0;
- info->event = 0;
- info->tty = NULL;
- if (info->blocked_open) {
- if (info->state->close_delay) {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(info->state->close_delay);
- }
- wake_up_interruptible(&info->open_wait);
- }
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
- ASYNC_CLOSING);
- wake_up_interruptible(&info->close_wait);
- MOD_DEC_USE_COUNT;
-}
-
-static void ambauart_wait_until_sent(struct tty_struct *tty, int timeout)
-{
- struct amba_info *info = (struct amba_info *) tty->driver_data;
- unsigned long char_time, expire;
- unsigned int status;
-
- if (info->port->fifosize == 0)
- return;
-
- /*
- * Set the check interval to be 1/5 of the estimated time to
- * send a single character, and make it at least 1. The check
- * interval should also be less than the timeout.
- *
- * Note: we have to use pretty tight timings here to satisfy
- * the NIST-PCTS.
- */
- char_time = (info->timeout - HZ/50) / info->port->fifosize;
- char_time = char_time / 5;
- if (char_time == 0)
- char_time = 1;
- if (timeout && timeout < char_time)
- char_time = timeout;
- /*
- * If the transmitter hasn't cleared in twice the approximate
- * amount of time to send the entire FIFO, it probably won't
- * ever clear. This assumes the UART isn't doing flow
- * control, which is currently the case. Hence, if it ever
- * takes longer than info->timeout, this is probably due to a
- * UART bug of some kind. So, we clamp the timeout parameter at
- * 2*info->timeout.
- */
- if (!timeout || timeout > 2 * info->timeout)
- timeout = 2 * info->timeout;
-
- expire = jiffies + timeout;
-#if DEBUG
- printk("ambauart_wait_until_sent(%d), jiff=%lu, expire=%lu...\n",
- minor(tty->device) - tty->driver.minor_start, jiffies,
- expire);
-#endif
- while (UART_GET_FR(info->port) & AMBA_UARTFR_BUSY) {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(char_time);
- if (signal_pending(current))
- break;
- if (timeout && time_after(jiffies, expire))
- break;
- status = UART_GET_FR(info->port);
- }
- set_current_state(TASK_RUNNING);
-}
-
-static void ambauart_hangup(struct tty_struct *tty)
-{
- struct amba_info *info = tty->driver_data;
- struct amba_state *state = info->state;
-
- ambauart_flush_buffer(tty);
- if (info->flags & ASYNC_CLOSING)
- return;
- ambauart_shutdown(info);
- info->event = 0;
- state->count = 0;
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
- info->tty = NULL;
- wake_up_interruptible(&info->open_wait);
-}
-
-static int block_til_ready(struct tty_struct *tty, struct file *filp,
- struct amba_info *info)
-{
- DECLARE_WAITQUEUE(wait, current);
- struct amba_state *state = info->state;
- unsigned long flags;
- int do_clocal = 0, extra_count = 0, retval;
-
- /*
- * If the device is in the middle of being closed, then block
- * until it's done, and then try again.
- */
- if (tty_hung_up_p(filp) ||
- (info->flags & ASYNC_CLOSING)) {
- if (info->flags & ASYNC_CLOSING)
- interruptible_sleep_on(&info->close_wait);
- return (info->flags & ASYNC_HUP_NOTIFY) ?
- -EAGAIN : -ERESTARTSYS;
- }
-
- /*
- * If this is a callout device, then just make sure the normal
- * device isn't being used.
- */
- if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
- if (info->flags & ASYNC_NORMAL_ACTIVE)
- return -EBUSY;
- if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_SESSION_LOCKOUT) &&
- (info->session != current->session))
- return -EBUSY;
- if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_PGRP_LOCKOUT) &&
- (info->pgrp != current->pgrp))
- return -EBUSY;
- info->flags |= ASYNC_CALLOUT_ACTIVE;
- return 0;
- }
-
- /*
- * If non-blocking mode is set, or the port is not enabled,
- * then make the check up front and then exit.
- */
- if ((filp->f_flags & O_NONBLOCK) ||
- (tty->flags & (1 << TTY_IO_ERROR))) {
- if (info->flags & ASYNC_CALLOUT_ACTIVE)
- return -EBUSY;
- info->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
-
- if (info->flags & ASYNC_CALLOUT_ACTIVE) {
- if (state->normal_termios.c_cflag & CLOCAL)
- do_clocal = 1;
- } else {
- if (tty->termios->c_cflag & CLOCAL)
- do_clocal = 1;
- }
-
- /*
- * Block waiting for the carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, state->count is dropped by one, so that
- * rs_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&info->open_wait, &wait);
- save_flags(flags); cli();
- if (!tty_hung_up_p(filp)) {
- extra_count = 1;
- state->count--;
- }
- restore_flags(flags);
- info->blocked_open++;
- while (1) {
- save_flags(flags); cli();
- if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (tty->termios->c_cflag & CBAUD)) {
- info->mctrl = TIOCM_DTR | TIOCM_RTS;
- info->port->set_mctrl(info->port, info->mctrl);
- }
- restore_flags(flags);
- set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !(info->flags & ASYNC_INITIALIZED)) {
- if (info->flags & ASYNC_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
- break;
- }
- if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
- !(info->flags & ASYNC_CLOSING) &&
- (do_clocal || (UART_GET_FR(info->port) & AMBA_UARTFR_DCD)))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- schedule();
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&info->open_wait, &wait);
- if (extra_count)
- state->count++;
- info->blocked_open--;
- if (retval)
- return retval;
- info->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
-}
-
-static struct amba_info *ambauart_get(int line)
-{
- struct amba_info *info;
- struct amba_state *state = amba_state + line;
-
- state->count++;
- if (state->info)
- return state->info;
- info = kmalloc(sizeof(struct amba_info), GFP_KERNEL);
- if (info) {
- memset(info, 0, sizeof(struct amba_info));
- init_waitqueue_head(&info->open_wait);
- init_waitqueue_head(&info->close_wait);
- init_waitqueue_head(&info->delta_msr_wait);
- info->flags = state->flags;
- info->state = state;
- info->port = amba_ports + line;
- tasklet_init(&info->tlet, ambauart_tasklet_action,
- (unsigned long)info);
- }
- if (state->info) {
- kfree(info);
- return state->info;
- }
- state->info = info;
- return info;
-}
-
-static int ambauart_open(struct tty_struct *tty, struct file *filp)
-{
- struct amba_info *info;
- int retval, line = minor(tty->device) - tty->driver.minor_start;
-
-#if DEBUG
- printk("ambauart_open(%d) called\n", line);
-#endif
-
- // is this a line that we've got?
- MOD_INC_USE_COUNT;
- if (line >= SERIAL_AMBA_NR) {
- MOD_DEC_USE_COUNT;
- return -ENODEV;
- }
-
- info = ambauart_get(line);
- if (!info)
- return -ENOMEM;
-
- tty->driver_data = info;
- info->tty = tty;
- info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
-
- /*
- * Make sure we have the temporary buffer allocated
- */
- if (!tmp_buf) {
- unsigned long page = get_zeroed_page(GFP_KERNEL);
- if (tmp_buf)
- free_page(page);
- else if (!page) {
- MOD_DEC_USE_COUNT;
- return -ENOMEM;
- }
- tmp_buf = (u_char *)page;
- }
-
- /*
- * If the port is in the middle of closing, bail out now.
- */
- if (tty_hung_up_p(filp) ||
- (info->flags & ASYNC_CLOSING)) {
- if (info->flags & ASYNC_CLOSING)
- interruptible_sleep_on(&info->close_wait);
- MOD_DEC_USE_COUNT;
- return -EAGAIN;
- }
-
- /*
- * Start up the serial port
- */
- retval = ambauart_startup(info);
- if (retval) {
- MOD_DEC_USE_COUNT;
- return retval;
- }
-
- retval = block_til_ready(tty, filp, info);
- if (retval) {
- MOD_DEC_USE_COUNT;
- return retval;
- }
-
- if ((info->state->count == 1) &&
- (info->flags & ASYNC_SPLIT_TERMIOS)) {
- if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
- *tty->termios = info->state->normal_termios;
- else
- *tty->termios = info->state->callout_termios;
- }
-#ifdef CONFIG_SERIAL_AMBA_CONSOLE
- if (ambauart_cons.cflag && ambauart_cons.index == line) {
- tty->termios->c_cflag = ambauart_cons.cflag;
- ambauart_cons.cflag = 0;
- }
-#endif
- ambauart_change_speed(info, NULL);
- info->session = current->session;
- info->pgrp = current->pgrp;
- return 0;
-}
-
-int __init ambauart_init(void)
-{
- int i;
-
- ambanormal_driver.magic = TTY_DRIVER_MAGIC;
- ambanormal_driver.driver_name = "serial_amba";
- ambanormal_driver.name = SERIAL_AMBA_NAME;
- ambanormal_driver.major = SERIAL_AMBA_MAJOR;
- ambanormal_driver.minor_start = SERIAL_AMBA_MINOR;
- ambanormal_driver.num = SERIAL_AMBA_NR;
- ambanormal_driver.type = TTY_DRIVER_TYPE_SERIAL;
- ambanormal_driver.subtype = SERIAL_TYPE_NORMAL;
- ambanormal_driver.init_termios = tty_std_termios;
- ambanormal_driver.init_termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
- ambanormal_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
- ambanormal_driver.refcount = &ambauart_refcount;
- ambanormal_driver.table = ambauart_table;
- ambanormal_driver.termios = ambauart_termios;
- ambanormal_driver.termios_locked = ambauart_termios_locked;
-
- ambanormal_driver.open = ambauart_open;
- ambanormal_driver.close = ambauart_close;
- ambanormal_driver.write = ambauart_write;
- ambanormal_driver.put_char = ambauart_put_char;
- ambanormal_driver.flush_chars = ambauart_flush_chars;
- ambanormal_driver.write_room = ambauart_write_room;
- ambanormal_driver.chars_in_buffer = ambauart_chars_in_buffer;
- ambanormal_driver.flush_buffer = ambauart_flush_buffer;
- ambanormal_driver.ioctl = ambauart_ioctl;
- ambanormal_driver.throttle = ambauart_throttle;
- ambanormal_driver.unthrottle = ambauart_unthrottle;
- ambanormal_driver.send_xchar = ambauart_send_xchar;
- ambanormal_driver.set_termios = ambauart_set_termios;
- ambanormal_driver.stop = ambauart_stop;
- ambanormal_driver.start = ambauart_start;
- ambanormal_driver.hangup = ambauart_hangup;
- ambanormal_driver.break_ctl = ambauart_break_ctl;
- ambanormal_driver.wait_until_sent = ambauart_wait_until_sent;
- ambanormal_driver.read_proc = NULL;
-
- /*
- * The callout device is just like the normal device except for
- * the major number and the subtype code.
- */
- ambacallout_driver = ambanormal_driver;
- ambacallout_driver.name = CALLOUT_AMBA_NAME;
- ambacallout_driver.major = CALLOUT_AMBA_MAJOR;
- ambacallout_driver.subtype = SERIAL_TYPE_CALLOUT;
- ambacallout_driver.read_proc = NULL;
- ambacallout_driver.proc_entry = NULL;
-
- if (tty_register_driver(&ambanormal_driver))
- panic("Couldn't register AMBA serial driver\n");
- if (tty_register_driver(&ambacallout_driver))
- panic("Couldn't register AMBA callout driver\n");
-
- for (i = 0; i < SERIAL_AMBA_NR; i++) {
- struct amba_state *state = amba_state + i;
- state->line = i;
- state->close_delay = 5 * HZ / 10;
- state->closing_wait = 30 * HZ;
- state->callout_termios = ambacallout_driver.init_termios;
- state->normal_termios = ambanormal_driver.init_termios;
- }
-
- return 0;
-}
-
-__initcall(ambauart_init);
-
-#ifdef CONFIG_SERIAL_AMBA_CONSOLE
-/************** console driver *****************/
-
-/*
- * This code is currently never used; console->read is never called.
- * Therefore, although we have an implementation, we don't use it.
- * FIXME: the "const char *s" should be fixed to "char *s" some day.
- * (when the definition in include/linux/console.h is also fixed)
- */
-#ifdef used_and_not_const_char_pointer
-static int ambauart_console_read(struct console *co, const char *s, u_int count)
-{
- struct amba_port *port = &amba_ports[co->index];
- unsigned int status;
- char *w;
- int c;
-#if DEBUG
- printk("ambauart_console_read() called\n");
-#endif
-
- c = 0;
- w = s;
- while (c < count) {
- status = UART_GET_FR(port);
- if (UART_RX_DATA(status)) {
- *w++ = UART_GET_CHAR(port);
- c++;
- } else {
- // nothing more to get, return
- return c;
- }
- }
- // return the count
- return c;
-}
-#endif
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- *
- * The console must be locked when we get here.
- */
-static void ambauart_console_write(struct console *co, const char *s, u_int count)
-{
- struct amba_port *port = &amba_ports[co->index];
- unsigned int status, old_cr;
- int i;
-
- /*
- * First save the CR then disable the interrupts
- */
- old_cr = UART_GET_CR(port);
- UART_PUT_CR(port, AMBA_UARTCR_UARTEN);
-
- /*
- * Now, do each character
- */
- for (i = 0; i < count; i++) {
- do {
- status = UART_GET_FR(port);
- } while (!UART_TX_READY(status));
- UART_PUT_CHAR(port, s[i]);
- if (s[i] == '\n') {
- do {
- status = UART_GET_FR(port);
- } while (!UART_TX_READY(status));
- UART_PUT_CHAR(port, '\r');
- }
- }
-
- /*
- * Finally, wait for transmitter to become empty
- * and restore the TCR
- */
- do {
- status = UART_GET_FR(port);
- } while (status & AMBA_UARTFR_BUSY);
- UART_PUT_CR(port, old_cr);
-}
-
-static kdev_t ambauart_console_device(struct console *c)
-{
- return mk_kdev(SERIAL_AMBA_MAJOR, SERIAL_AMBA_MINOR + c->index);
-}
-
-static int __init ambauart_console_setup(struct console *co, char *options)
-{
- struct amba_port *port;
- int baud = 38400;
- int bits = 8;
- int parity = 'n';
- u_int cflag = CREAD | HUPCL | CLOCAL;
- u_int lcr_h, quot;
-
- if (co->index >= SERIAL_AMBA_NR)
- co->index = 0;
-
- port = &amba_ports[co->index];
-
- if (options) {
- char *s = options;
- baud = simple_strtoul(s, NULL, 10);
- while (*s >= '0' && *s <= '9')
- s++;
- if (*s) parity = *s++;
- if (*s) bits = *s - '0';
- }
-
- /*
- * Now construct a cflag setting.
- */
- switch (baud) {
- case 1200: cflag |= B1200; break;
- case 2400: cflag |= B2400; break;
- case 4800: cflag |= B4800; break;
- default: cflag |= B9600; baud = 9600; break;
- case 19200: cflag |= B19200; break;
- case 38400: cflag |= B38400; break;
- case 57600: cflag |= B57600; break;
- case 115200: cflag |= B115200; break;
- }
- switch (bits) {
- case 7: cflag |= CS7; lcr_h = AMBA_UARTLCR_H_WLEN_7; break;
- default: cflag |= CS8; lcr_h = AMBA_UARTLCR_H_WLEN_8; break;
- }
- switch (parity) {
- case 'o':
- case 'O': cflag |= PARODD; lcr_h |= AMBA_UARTLCR_H_PEN; break;
- case 'e':
- case 'E': cflag |= PARENB; lcr_h |= AMBA_UARTLCR_H_PEN |
- AMBA_UARTLCR_H_EPS; break;
- }
-
- co->cflag = cflag;
-
- if (port->fifosize > 1)
- lcr_h |= AMBA_UARTLCR_H_FEN;
-
- quot = (port->uartclk / (16 * baud)) - 1;
-
- UART_PUT_LCRL(port, (quot & 0xff));
- UART_PUT_LCRM(port, (quot >> 8));
- UART_PUT_LCRH(port, lcr_h);
-
- /* we will enable the port as we need it */
- UART_PUT_CR(port, 0);
-
- return 0;
-}
-
-static struct console ambauart_cons =
-{
- name: SERIAL_AMBA_NAME,
- write: ambauart_console_write,
-#ifdef used_and_not_const_char_pointer
- read: ambauart_console_read,
-#endif
- device: ambauart_console_device,
- setup: ambauart_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
-};
-
-void __init ambauart_console_init(void)
-{
- register_console(&ambauart_cons);
-}
-
-#endif /* CONFIG_SERIAL_AMBA_CONSOLE */
-
-MODULE_LICENSE("GPL");
projects / linux / commitdiff