299 lines
6.9 KiB
C
299 lines
6.9 KiB
C
/*
|
|
* arch/xtensa/platforms/iss/console.c
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001-2005 Tensilica Inc.
|
|
* Authors Christian Zankel, Joe Taylor
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/console.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/major.h>
|
|
#include <linux/param.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serialP.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/irq.h>
|
|
|
|
#include <platform/simcall.h>
|
|
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
|
|
#ifdef SERIAL_INLINE
|
|
#define _INLINE_ inline
|
|
#endif
|
|
|
|
#define SERIAL_MAX_NUM_LINES 1
|
|
#define SERIAL_TIMER_VALUE (20 * HZ)
|
|
|
|
static struct tty_driver *serial_driver;
|
|
static struct timer_list serial_timer;
|
|
|
|
static DEFINE_SPINLOCK(timer_lock);
|
|
|
|
int errno;
|
|
|
|
static int __simc (int a, int b, int c, int d, int e, int f) __attribute__((__noinline__));
|
|
static int __simc (int a, int b, int c, int d, int e, int f)
|
|
{
|
|
int ret;
|
|
__asm__ __volatile__ ("simcall\n"
|
|
"mov %0, a2\n"
|
|
"mov %1, a3\n" : "=a" (ret), "=a" (errno)
|
|
: : "a2", "a3");
|
|
return ret;
|
|
}
|
|
|
|
static char *serial_version = "0.1";
|
|
static char *serial_name = "ISS serial driver";
|
|
|
|
/*
|
|
* This routine is called whenever a serial port is opened. It
|
|
* enables interrupts for a serial port, linking in its async structure into
|
|
* the IRQ chain. It also performs the serial-specific
|
|
* initialization for the tty structure.
|
|
*/
|
|
|
|
static void rs_poll(unsigned long);
|
|
|
|
static int rs_open(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
int line = tty->index;
|
|
|
|
if ((line < 0) || (line >= SERIAL_MAX_NUM_LINES))
|
|
return -ENODEV;
|
|
|
|
spin_lock(&timer_lock);
|
|
|
|
if (tty->count == 1) {
|
|
init_timer(&serial_timer);
|
|
serial_timer.data = (unsigned long) tty;
|
|
serial_timer.function = rs_poll;
|
|
mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
|
|
}
|
|
spin_unlock(&timer_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* iss_serial_close()
|
|
*
|
|
* This routine is called when the serial port gets closed. First, we
|
|
* wait for the last remaining data to be sent. Then, we unlink its
|
|
* async structure from the interrupt chain if necessary, and we free
|
|
* that IRQ if nothing is left in the chain.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
spin_lock(&timer_lock);
|
|
if (tty->count == 1)
|
|
del_timer_sync(&serial_timer);
|
|
spin_unlock(&timer_lock);
|
|
}
|
|
|
|
|
|
static int rs_write(struct tty_struct * tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
/* see drivers/char/serialX.c to reference original version */
|
|
|
|
__simc (SYS_write, 1, (unsigned long)buf, count, 0, 0);
|
|
return count;
|
|
}
|
|
|
|
static void rs_poll(unsigned long priv)
|
|
{
|
|
struct tty_struct* tty = (struct tty_struct*) priv;
|
|
|
|
struct timeval tv = { .tv_sec = 0, .tv_usec = 0 };
|
|
int i = 0;
|
|
unsigned char c;
|
|
|
|
spin_lock(&timer_lock);
|
|
|
|
while (__simc(SYS_select_one, 0, XTISS_SELECT_ONE_READ, (int)&tv,0,0)){
|
|
__simc (SYS_read, 0, (unsigned long)&c, 1, 0, 0);
|
|
tty_insert_flip_char(tty, c, TTY_NORMAL);
|
|
i++;
|
|
}
|
|
|
|
if (i)
|
|
tty_flip_buffer_push(tty);
|
|
|
|
|
|
mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
|
|
spin_unlock(&timer_lock);
|
|
}
|
|
|
|
|
|
static int rs_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
char buf[2];
|
|
|
|
buf[0] = ch;
|
|
buf[1] = '\0'; /* Is this NULL necessary? */
|
|
__simc (SYS_write, 1, (unsigned long) buf, 1, 0, 0);
|
|
return 1;
|
|
}
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
}
|
|
|
|
static int rs_write_room(struct tty_struct *tty)
|
|
{
|
|
/* Let's say iss can always accept 2K characters.. */
|
|
return 2 * 1024;
|
|
}
|
|
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
/* the iss doesn't buffer characters */
|
|
return 0;
|
|
}
|
|
|
|
static void rs_hangup(struct tty_struct *tty)
|
|
{
|
|
/* Stub, once again.. */
|
|
}
|
|
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
/* Stub, once again.. */
|
|
}
|
|
|
|
static int rs_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
|
|
return 0;
|
|
}
|
|
|
|
static int rs_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, rs_proc_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations rs_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rs_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static struct tty_operations serial_ops = {
|
|
.open = rs_open,
|
|
.close = rs_close,
|
|
.write = rs_write,
|
|
.put_char = rs_put_char,
|
|
.flush_chars = rs_flush_chars,
|
|
.write_room = rs_write_room,
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
|
.hangup = rs_hangup,
|
|
.wait_until_sent = rs_wait_until_sent,
|
|
.proc_fops = &rs_proc_fops,
|
|
};
|
|
|
|
int __init rs_init(void)
|
|
{
|
|
serial_driver = alloc_tty_driver(1);
|
|
|
|
printk ("%s %s\n", serial_name, serial_version);
|
|
|
|
/* Initialize the tty_driver structure */
|
|
|
|
serial_driver->owner = THIS_MODULE;
|
|
serial_driver->driver_name = "iss_serial";
|
|
serial_driver->name = "ttyS";
|
|
serial_driver->major = TTY_MAJOR;
|
|
serial_driver->minor_start = 64;
|
|
serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
serial_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
serial_driver->init_termios = tty_std_termios;
|
|
serial_driver->init_termios.c_cflag =
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
|
|
tty_set_operations(serial_driver, &serial_ops);
|
|
|
|
if (tty_register_driver(serial_driver))
|
|
panic("Couldn't register serial driver\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
static __exit void rs_exit(void)
|
|
{
|
|
int error;
|
|
|
|
if ((error = tty_unregister_driver(serial_driver)))
|
|
printk("ISS_SERIAL: failed to unregister serial driver (%d)\n",
|
|
error);
|
|
put_tty_driver(serial_driver);
|
|
}
|
|
|
|
|
|
/* We use `late_initcall' instead of just `__initcall' as a workaround for
|
|
* the fact that (1) simcons_tty_init can't be called before tty_init,
|
|
* (2) tty_init is called via `module_init', (3) if statically linked,
|
|
* module_init == device_init, and (4) there's no ordering of init lists.
|
|
* We can do this easily because simcons is always statically linked, but
|
|
* other tty drivers that depend on tty_init and which must use
|
|
* `module_init' to declare their init routines are likely to be broken.
|
|
*/
|
|
|
|
late_initcall(rs_init);
|
|
|
|
|
|
#ifdef CONFIG_SERIAL_CONSOLE
|
|
|
|
static void iss_console_write(struct console *co, const char *s, unsigned count)
|
|
{
|
|
int len = strlen(s);
|
|
|
|
if (s != 0 && *s != 0)
|
|
__simc (SYS_write, 1, (unsigned long)s,
|
|
count < len ? count : len,0,0);
|
|
}
|
|
|
|
static struct tty_driver* iss_console_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return serial_driver;
|
|
}
|
|
|
|
|
|
static struct console sercons = {
|
|
.name = "ttyS",
|
|
.write = iss_console_write,
|
|
.device = iss_console_device,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1
|
|
};
|
|
|
|
static int __init iss_console_init(void)
|
|
{
|
|
register_console(&sercons);
|
|
return 0;
|
|
}
|
|
|
|
console_initcall(iss_console_init);
|
|
|
|
#endif /* CONFIG_SERIAL_CONSOLE */
|
|
|