286 lines
7.7 KiB
C
286 lines
7.7 KiB
C
/*
|
|
* PDC Console support - ie use firmware to dump text via boot console
|
|
*
|
|
* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
|
|
* Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
|
|
* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
|
|
* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
|
|
* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
|
|
* Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
|
|
* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
|
|
* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
|
|
* Copyright (C) 2001 Helge Deller <deller at parisc-linux.org>
|
|
* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
|
|
* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
|
|
* Copyright (C) 2010 Guy Martin <gmsoft at tuxicoman.be>
|
|
*
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* The PDC console is a simple console, which can be used for debugging
|
|
* boot related problems on HP PA-RISC machines. It is also useful when no
|
|
* other console works.
|
|
*
|
|
* This code uses the ROM (=PDC) based functions to read and write characters
|
|
* from and to PDC's boot path.
|
|
*/
|
|
|
|
/* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems.
|
|
* On production kernels EARLY_BOOTUP_DEBUG should be undefined. */
|
|
#define EARLY_BOOTUP_DEBUG
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/console.h>
|
|
#include <linux/string.h>
|
|
#include <linux/init.h>
|
|
#include <linux/major.h>
|
|
#include <linux/tty.h>
|
|
#include <asm/pdc.h> /* for iodc_call() proto and friends */
|
|
|
|
static DEFINE_SPINLOCK(pdc_console_lock);
|
|
static struct console pdc_cons;
|
|
|
|
static void pdc_console_write(struct console *co, const char *s, unsigned count)
|
|
{
|
|
int i = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pdc_console_lock, flags);
|
|
do {
|
|
i += pdc_iodc_print(s + i, count - i);
|
|
} while (i < count);
|
|
spin_unlock_irqrestore(&pdc_console_lock, flags);
|
|
}
|
|
|
|
int pdc_console_poll_key(struct console *co)
|
|
{
|
|
int c;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pdc_console_lock, flags);
|
|
c = pdc_iodc_getc();
|
|
spin_unlock_irqrestore(&pdc_console_lock, flags);
|
|
|
|
return c;
|
|
}
|
|
|
|
static int pdc_console_setup(struct console *co, char *options)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_PDC_CONSOLE)
|
|
#include <linux/vt_kern.h>
|
|
#include <linux/tty_flip.h>
|
|
|
|
#define PDC_CONS_POLL_DELAY (30 * HZ / 1000)
|
|
|
|
static void pdc_console_poll(unsigned long unused);
|
|
static DEFINE_TIMER(pdc_console_timer, pdc_console_poll, 0, 0);
|
|
static struct tty_port tty_port;
|
|
|
|
static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
tty_port_tty_set(&tty_port, tty);
|
|
mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
if (!tty->count) {
|
|
del_timer_sync(&pdc_console_timer);
|
|
tty_port_tty_set(&tty_port, NULL);
|
|
}
|
|
}
|
|
|
|
static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
|
|
{
|
|
pdc_console_write(NULL, buf, count);
|
|
return count;
|
|
}
|
|
|
|
static int pdc_console_tty_write_room(struct tty_struct *tty)
|
|
{
|
|
return 32768; /* no limit, no buffer used */
|
|
}
|
|
|
|
static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
return 0; /* no buffer */
|
|
}
|
|
|
|
static const struct tty_operations pdc_console_tty_ops = {
|
|
.open = pdc_console_tty_open,
|
|
.close = pdc_console_tty_close,
|
|
.write = pdc_console_tty_write,
|
|
.write_room = pdc_console_tty_write_room,
|
|
.chars_in_buffer = pdc_console_tty_chars_in_buffer,
|
|
};
|
|
|
|
static void pdc_console_poll(unsigned long unused)
|
|
{
|
|
int data, count = 0;
|
|
struct tty_struct *tty = tty_port_tty_get(&tty_port);
|
|
|
|
if (!tty)
|
|
return;
|
|
|
|
while (1) {
|
|
data = pdc_console_poll_key(NULL);
|
|
if (data == -1)
|
|
break;
|
|
tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL);
|
|
count ++;
|
|
}
|
|
|
|
if (count)
|
|
tty_flip_buffer_push(tty);
|
|
|
|
tty_kref_put(tty);
|
|
|
|
if (pdc_cons.flags & CON_ENABLED)
|
|
mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
|
|
}
|
|
|
|
static struct tty_driver *pdc_console_tty_driver;
|
|
|
|
static int __init pdc_console_tty_driver_init(void)
|
|
{
|
|
int err;
|
|
|
|
/* Check if the console driver is still registered.
|
|
* It is unregistered if the pdc console was not selected as the
|
|
* primary console. */
|
|
|
|
struct console *tmp;
|
|
|
|
console_lock();
|
|
for_each_console(tmp)
|
|
if (tmp == &pdc_cons)
|
|
break;
|
|
console_unlock();
|
|
|
|
if (!tmp) {
|
|
printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n");
|
|
pdc_cons.flags &= ~CON_BOOT;
|
|
|
|
tty_port_init(&tty_port);
|
|
|
|
pdc_console_tty_driver = alloc_tty_driver(1);
|
|
|
|
if (!pdc_console_tty_driver)
|
|
return -ENOMEM;
|
|
|
|
pdc_console_tty_driver->driver_name = "pdc_cons";
|
|
pdc_console_tty_driver->name = "ttyB";
|
|
pdc_console_tty_driver->major = MUX_MAJOR;
|
|
pdc_console_tty_driver->minor_start = 0;
|
|
pdc_console_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;
|
|
pdc_console_tty_driver->init_termios = tty_std_termios;
|
|
pdc_console_tty_driver->flags = TTY_DRIVER_REAL_RAW |
|
|
TTY_DRIVER_RESET_TERMIOS;
|
|
tty_set_operations(pdc_console_tty_driver, &pdc_console_tty_ops);
|
|
|
|
err = tty_register_driver(pdc_console_tty_driver);
|
|
if (err) {
|
|
printk(KERN_ERR "Unable to register the PDC console TTY driver\n");
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(pdc_console_tty_driver_init);
|
|
|
|
static struct tty_driver * pdc_console_device (struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return pdc_console_tty_driver;
|
|
}
|
|
#else
|
|
#define pdc_console_device NULL
|
|
#endif
|
|
|
|
static struct console pdc_cons = {
|
|
.name = "ttyB",
|
|
.write = pdc_console_write,
|
|
.device = pdc_console_device,
|
|
.setup = pdc_console_setup,
|
|
.flags = CON_BOOT | CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
static int pdc_console_initialized;
|
|
|
|
static void pdc_console_init_force(void)
|
|
{
|
|
if (pdc_console_initialized)
|
|
return;
|
|
++pdc_console_initialized;
|
|
|
|
/* If the console is duplex then copy the COUT parameters to CIN. */
|
|
if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
|
|
memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons));
|
|
|
|
/* register the pdc console */
|
|
register_console(&pdc_cons);
|
|
}
|
|
|
|
void __init pdc_console_init(void)
|
|
{
|
|
#if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE)
|
|
pdc_console_init_force();
|
|
#endif
|
|
#ifdef EARLY_BOOTUP_DEBUG
|
|
printk(KERN_INFO "Initialized PDC Console for debugging.\n");
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Used for emergencies. Currently only used if an HPMC occurs. If an
|
|
* HPMC occurs, it is possible that the current console may not be
|
|
* properly initialised after the PDC IO reset. This routine unregisters
|
|
* all of the current consoles, reinitializes the pdc console and
|
|
* registers it.
|
|
*/
|
|
|
|
void pdc_console_restart(void)
|
|
{
|
|
struct console *console;
|
|
|
|
if (pdc_console_initialized)
|
|
return;
|
|
|
|
/* If we've already seen the output, don't bother to print it again */
|
|
if (console_drivers != NULL)
|
|
pdc_cons.flags &= ~CON_PRINTBUFFER;
|
|
|
|
while ((console = console_drivers) != NULL)
|
|
unregister_console(console_drivers);
|
|
|
|
/* force registering the pdc console */
|
|
pdc_console_init_force();
|
|
}
|