287 lines
7.4 KiB
C
287 lines
7.4 KiB
C
/*
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* PDC Console support - ie use firmware to dump text via boot console
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*
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
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* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
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* Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
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* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
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* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
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* Copyright (C) 2001 Helge Deller <deller at parisc-linux.org>
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* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
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* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
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* Copyright (C) 2010 Guy Martin <gmsoft at tuxicoman.be>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* The PDC console is a simple console, which can be used for debugging
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* boot related problems on HP PA-RISC machines. It is also useful when no
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* other console works.
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*
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* This code uses the ROM (=PDC) based functions to read and write characters
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* from and to PDC's boot path.
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*/
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/* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems.
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* On production kernels EARLY_BOOTUP_DEBUG should be undefined. */
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#define EARLY_BOOTUP_DEBUG
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#include <linux/kernel.h>
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#include <linux/console.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/major.h>
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#include <linux/tty.h>
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#include <asm/pdc.h> /* for iodc_call() proto and friends */
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static DEFINE_SPINLOCK(pdc_console_lock);
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static struct console pdc_cons;
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static void pdc_console_write(struct console *co, const char *s, unsigned count)
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{
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int i = 0;
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unsigned long flags;
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spin_lock_irqsave(&pdc_console_lock, flags);
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do {
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i += pdc_iodc_print(s + i, count - i);
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} while (i < count);
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spin_unlock_irqrestore(&pdc_console_lock, flags);
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}
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int pdc_console_poll_key(struct console *co)
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{
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int c;
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unsigned long flags;
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spin_lock_irqsave(&pdc_console_lock, flags);
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c = pdc_iodc_getc();
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spin_unlock_irqrestore(&pdc_console_lock, flags);
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return c;
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}
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static int pdc_console_setup(struct console *co, char *options)
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{
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return 0;
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}
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#if defined(CONFIG_PDC_CONSOLE)
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#include <linux/vt_kern.h>
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#include <linux/tty_flip.h>
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#define PDC_CONS_POLL_DELAY (30 * HZ / 1000)
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static struct timer_list pdc_console_timer;
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static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
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{
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mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
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return 0;
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}
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static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
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{
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if (!tty->count)
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del_timer(&pdc_console_timer);
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}
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static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
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{
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pdc_console_write(NULL, buf, count);
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return count;
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}
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static int pdc_console_tty_write_room(struct tty_struct *tty)
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{
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return 32768; /* no limit, no buffer used */
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}
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static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty)
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{
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return 0; /* no buffer */
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}
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static struct tty_driver *pdc_console_tty_driver;
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static const struct tty_operations pdc_console_tty_ops = {
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.open = pdc_console_tty_open,
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.close = pdc_console_tty_close,
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.write = pdc_console_tty_write,
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.write_room = pdc_console_tty_write_room,
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.chars_in_buffer = pdc_console_tty_chars_in_buffer,
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};
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static void pdc_console_poll(unsigned long unused)
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{
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int data, count = 0;
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struct tty_struct *tty = pdc_console_tty_driver->ttys[0];
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if (!tty)
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return;
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while (1) {
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data = pdc_console_poll_key(NULL);
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if (data == -1)
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break;
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tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL);
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count ++;
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}
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if (count)
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tty_flip_buffer_push(tty);
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if (tty->count && (pdc_cons.flags & CON_ENABLED))
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mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
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}
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static int __init pdc_console_tty_driver_init(void)
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{
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int err;
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struct tty_driver *drv;
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/* Check if the console driver is still registered.
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* It is unregistered if the pdc console was not selected as the
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* primary console. */
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struct console *tmp;
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console_lock();
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for_each_console(tmp)
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if (tmp == &pdc_cons)
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break;
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console_unlock();
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if (!tmp) {
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printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name);
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return -ENODEV;
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}
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printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n");
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pdc_cons.flags &= ~CON_BOOT;
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drv = alloc_tty_driver(1);
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if (!drv)
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return -ENOMEM;
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drv->driver_name = "pdc_cons";
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drv->name = "ttyB";
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drv->major = MUX_MAJOR;
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drv->minor_start = 0;
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drv->type = TTY_DRIVER_TYPE_SYSTEM;
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drv->init_termios = tty_std_termios;
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drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
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tty_set_operations(drv, &pdc_console_tty_ops);
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err = tty_register_driver(drv);
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if (err) {
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printk(KERN_ERR "Unable to register the PDC console TTY driver\n");
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return err;
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}
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pdc_console_tty_driver = drv;
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/* No need to initialize the pdc_console_timer if tty isn't allocated */
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init_timer(&pdc_console_timer);
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pdc_console_timer.function = pdc_console_poll;
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return 0;
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}
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module_init(pdc_console_tty_driver_init);
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static struct tty_driver * pdc_console_device (struct console *c, int *index)
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{
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*index = c->index;
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return pdc_console_tty_driver;
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}
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#else
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#define pdc_console_device NULL
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#endif
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static struct console pdc_cons = {
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.name = "ttyB",
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.write = pdc_console_write,
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.device = pdc_console_device,
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.setup = pdc_console_setup,
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.flags = CON_BOOT | CON_PRINTBUFFER,
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.index = -1,
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};
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static int pdc_console_initialized;
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static void pdc_console_init_force(void)
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{
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if (pdc_console_initialized)
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return;
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++pdc_console_initialized;
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/* If the console is duplex then copy the COUT parameters to CIN. */
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if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
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memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons));
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/* register the pdc console */
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register_console(&pdc_cons);
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}
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void __init pdc_console_init(void)
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{
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#if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE)
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pdc_console_init_force();
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#endif
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#ifdef EARLY_BOOTUP_DEBUG
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printk(KERN_INFO "Initialized PDC Console for debugging.\n");
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#endif
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}
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/*
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* Used for emergencies. Currently only used if an HPMC occurs. If an
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* HPMC occurs, it is possible that the current console may not be
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* properly initialised after the PDC IO reset. This routine unregisters
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* all of the current consoles, reinitializes the pdc console and
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* registers it.
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*/
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void pdc_console_restart(void)
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{
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struct console *console;
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if (pdc_console_initialized)
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return;
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/* If we've already seen the output, don't bother to print it again */
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if (console_drivers != NULL)
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pdc_cons.flags &= ~CON_PRINTBUFFER;
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while ((console = console_drivers) != NULL)
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unregister_console(console_drivers);
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/* force registering the pdc console */
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pdc_console_init_force();
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}
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