258 lines
6 KiB
C
Executable file
258 lines
6 KiB
C
Executable file
/*
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* arch/xtensa/platforms/iss/console.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001-2005 Tensilica Inc.
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* Authors Christian Zankel, Joe Taylor
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/major.h>
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#include <linux/param.h>
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#include <linux/seq_file.h>
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#include <linux/serial.h>
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#include <linux/uaccess.h>
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#include <asm/irq.h>
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#include <platform/simcall.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#define SERIAL_MAX_NUM_LINES 1
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#define SERIAL_TIMER_VALUE (HZ / 10)
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static struct tty_driver *serial_driver;
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static struct tty_port serial_port;
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static struct timer_list serial_timer;
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static DEFINE_SPINLOCK(timer_lock);
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static char *serial_version = "0.1";
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static char *serial_name = "ISS serial driver";
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/*
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* This routine is called whenever a serial port is opened. It
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* enables interrupts for a serial port, linking in its async structure into
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* the IRQ chain. It also performs the serial-specific
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* initialization for the tty structure.
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*/
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static void rs_poll(struct timer_list *);
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static int rs_open(struct tty_struct *tty, struct file * filp)
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{
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tty->port = &serial_port;
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spin_lock_bh(&timer_lock);
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if (tty->count == 1) {
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timer_setup(&serial_timer, rs_poll, 0);
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mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
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}
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spin_unlock_bh(&timer_lock);
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return 0;
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}
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/*
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* ------------------------------------------------------------
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* iss_serial_close()
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*
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* This routine is called when the serial port gets closed. First, we
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* wait for the last remaining data to be sent. Then, we unlink its
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* async structure from the interrupt chain if necessary, and we free
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* that IRQ if nothing is left in the chain.
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* ------------------------------------------------------------
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*/
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static void rs_close(struct tty_struct *tty, struct file * filp)
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{
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spin_lock_bh(&timer_lock);
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if (tty->count == 1)
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del_timer_sync(&serial_timer);
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spin_unlock_bh(&timer_lock);
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}
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static int rs_write(struct tty_struct * tty,
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const unsigned char *buf, int count)
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{
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/* see drivers/char/serialX.c to reference original version */
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simc_write(1, buf, count);
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return count;
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}
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static void rs_poll(struct timer_list *unused)
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{
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struct tty_port *port = &serial_port;
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int i = 0;
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int rd = 1;
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unsigned char c;
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spin_lock(&timer_lock);
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while (simc_poll(0)) {
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rd = simc_read(0, &c, 1);
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if (rd <= 0)
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break;
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tty_insert_flip_char(port, c, TTY_NORMAL);
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i++;
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}
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if (i)
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tty_flip_buffer_push(port);
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if (rd)
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mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
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spin_unlock(&timer_lock);
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}
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static int rs_put_char(struct tty_struct *tty, unsigned char ch)
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{
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return rs_write(tty, &ch, 1);
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}
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static void rs_flush_chars(struct tty_struct *tty)
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{
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}
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static int rs_write_room(struct tty_struct *tty)
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{
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/* Let's say iss can always accept 2K characters.. */
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return 2 * 1024;
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}
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static int rs_chars_in_buffer(struct tty_struct *tty)
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{
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/* the iss doesn't buffer characters */
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return 0;
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}
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static void rs_hangup(struct tty_struct *tty)
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{
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/* Stub, once again.. */
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}
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static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
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{
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/* Stub, once again.. */
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}
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static int rs_proc_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
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return 0;
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}
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static const struct tty_operations serial_ops = {
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.open = rs_open,
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.close = rs_close,
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.write = rs_write,
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.put_char = rs_put_char,
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.flush_chars = rs_flush_chars,
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.write_room = rs_write_room,
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.chars_in_buffer = rs_chars_in_buffer,
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.hangup = rs_hangup,
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.wait_until_sent = rs_wait_until_sent,
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.proc_show = rs_proc_show,
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};
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int __init rs_init(void)
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{
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tty_port_init(&serial_port);
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serial_driver = alloc_tty_driver(SERIAL_MAX_NUM_LINES);
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pr_info("%s %s\n", serial_name, serial_version);
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/* Initialize the tty_driver structure */
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serial_driver->driver_name = "iss_serial";
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serial_driver->name = "ttyS";
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serial_driver->major = TTY_MAJOR;
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serial_driver->minor_start = 64;
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serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
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serial_driver->subtype = SERIAL_TYPE_NORMAL;
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serial_driver->init_termios = tty_std_termios;
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serial_driver->init_termios.c_cflag =
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B9600 | CS8 | CREAD | HUPCL | CLOCAL;
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serial_driver->flags = TTY_DRIVER_REAL_RAW;
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tty_set_operations(serial_driver, &serial_ops);
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tty_port_link_device(&serial_port, serial_driver, 0);
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if (tty_register_driver(serial_driver))
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panic("Couldn't register serial driver\n");
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return 0;
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}
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static __exit void rs_exit(void)
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{
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int error;
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if ((error = tty_unregister_driver(serial_driver)))
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pr_err("ISS_SERIAL: failed to unregister serial driver (%d)\n",
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error);
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put_tty_driver(serial_driver);
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tty_port_destroy(&serial_port);
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}
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/* We use `late_initcall' instead of just `__initcall' as a workaround for
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* the fact that (1) simcons_tty_init can't be called before tty_init,
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* (2) tty_init is called via `module_init', (3) if statically linked,
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* module_init == device_init, and (4) there's no ordering of init lists.
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* We can do this easily because simcons is always statically linked, but
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* other tty drivers that depend on tty_init and which must use
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* `module_init' to declare their init routines are likely to be broken.
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*/
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late_initcall(rs_init);
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#ifdef CONFIG_SERIAL_CONSOLE
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static void iss_console_write(struct console *co, const char *s, unsigned count)
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{
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int len = strlen(s);
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if (s != 0 && *s != 0)
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simc_write(1, s, count < len ? count : len);
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}
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static struct tty_driver* iss_console_device(struct console *c, int *index)
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{
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*index = c->index;
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return serial_driver;
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}
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static struct console sercons = {
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.name = "ttyS",
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.write = iss_console_write,
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.device = iss_console_device,
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.flags = CON_PRINTBUFFER,
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.index = -1
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};
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static int __init iss_console_init(void)
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{
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register_console(&sercons);
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return 0;
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}
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console_initcall(iss_console_init);
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#endif /* CONFIG_SERIAL_CONSOLE */
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