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parisc: Convert PDC console to an early console
Rewrite the PDC console to become an early console. Beside the fact that now boot information is visible until another (text- or graphics) console takes over, this benefits as well machines with a yet-unsupported STI console and kgdb. Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
parent
b148766e2b
commit
027c3d345e
@ -19,9 +19,6 @@ extern unsigned long parisc_pat_pdc_cap; /* PDC capabilities (PAT) */
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#define PDC_TYPE_SYSTEM_MAP 1 /* 32-bit, but supports PDC_SYSTEM_MAP */
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#define PDC_TYPE_SNAKE 2 /* Doesn't support SYSTEM_MAP */
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void pdc_console_init(void); /* in pdc_console.c */
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void pdc_console_restart(void);
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void setup_pdc(void); /* in inventory.c */
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/* wrapper-functions from pdc.c */
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@ -1,46 +1,18 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PDC Console support - ie use firmware to dump text via boot console
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* PDC early console support - use PDC 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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* Copyright (C) 2001-2022 Helge Deller <deller@gmx.de>
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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 <linux/serial_core.h>
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#include <linux/kgdb.h>
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#include <asm/page.h> /* for PAGE0 */
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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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@ -54,7 +26,8 @@ static void pdc_console_write(struct console *co, const char *s, unsigned 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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#ifdef CONFIG_KGDB
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static int kgdb_pdc_read_char(void)
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{
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int c;
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unsigned long flags;
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@ -63,201 +36,40 @@ int pdc_console_poll_key(struct console *co)
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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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return (c <= 0) ? NO_POLL_CHAR : c;
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}
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static int pdc_console_setup(struct console *co, char *options)
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static void kgdb_pdc_write_char(u8 chr)
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{
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return 0;
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if (PAGE0->mem_cons.cl_class != CL_DUPLEX)
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pdc_console_write(NULL, &chr, 1);
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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 void pdc_console_poll(struct timer_list *unused);
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static DEFINE_TIMER(pdc_console_timer, pdc_console_poll);
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static struct tty_port tty_port;
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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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tty_port_tty_set(&tty_port, tty);
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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 == 1) {
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del_timer_sync(&pdc_console_timer);
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tty_port_tty_set(&tty_port, NULL);
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}
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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 unsigned 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 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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static struct kgdb_io kgdb_pdc_io_ops = {
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.name = "kgdb_pdc",
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.read_char = kgdb_pdc_read_char,
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.write_char = kgdb_pdc_write_char,
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};
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static void pdc_console_poll(struct timer_list *unused)
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{
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int data, count = 0;
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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_port, 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_port);
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if (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 struct tty_driver *pdc_console_tty_driver;
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static int __init pdc_console_tty_driver_init(void)
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{
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struct tty_driver *driver;
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int err;
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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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driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_RESET_TERMIOS);
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if (IS_ERR(driver))
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return PTR_ERR(driver);
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tty_port_init(&tty_port);
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driver->driver_name = "pdc_cons";
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driver->name = "ttyB";
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driver->major = MUX_MAJOR;
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driver->minor_start = 0;
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driver->type = TTY_DRIVER_TYPE_SYSTEM;
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driver->init_termios = tty_std_termios;
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tty_set_operations(driver, &pdc_console_tty_ops);
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tty_port_link_device(&tty_port, driver, 0);
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err = tty_register_driver(driver);
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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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tty_port_destroy(&tty_port);
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tty_driver_kref_put(driver);
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return err;
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}
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pdc_console_tty_driver = driver;
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return 0;
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}
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device_initcall(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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static int __init pdc_earlycon_setup(struct earlycon_device *device,
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const char *opt)
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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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struct console *earlycon_console;
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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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earlycon_console = device->con;
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earlycon_console->write = pdc_console_write;
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device->port.iotype = UPIO_MEM32BE;
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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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#ifdef CONFIG_KGDB
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kgdb_register_io_module(&kgdb_pdc_io_ops);
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#endif
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return 0;
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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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EARLYCON_DECLARE(pdc, pdc_earlycon_setup);
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@ -70,6 +70,10 @@ void __init setup_cmdline(char **cmdline_p)
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strlcat(p, "tty0", COMMAND_LINE_SIZE);
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}
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/* default to use early console */
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if (!strstr(p, "earlycon"))
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strlcat(p, " earlycon=pdc", COMMAND_LINE_SIZE);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (boot_args[2] != 0) /* did palo pass us a ramdisk? */
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{
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@ -139,8 +143,6 @@ void __init setup_arch(char **cmdline_p)
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if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE)
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panic("KERNEL_INITIAL_ORDER too small!");
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pdc_console_init();
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#ifdef CONFIG_64BIT
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if(parisc_narrow_firmware) {
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printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
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@ -239,13 +239,6 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
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/* unlock the pdc lock if necessary */
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pdc_emergency_unlock();
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/* maybe the kernel hasn't booted very far yet and hasn't been able
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* to initialize the serial or STI console. In that case we should
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* re-enable the pdc console, so that the user will be able to
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* identify the problem. */
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if (!console_drivers)
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pdc_console_restart();
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if (err)
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printk(KERN_CRIT "%s (pid %d): %s (code %ld)\n",
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current->comm, task_pid_nr(current), str, err);
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@ -429,10 +422,6 @@ void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long o
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/* unlock the pdc lock if necessary */
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pdc_emergency_unlock();
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/* restart pdc console if necessary */
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if (!console_drivers)
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pdc_console_restart();
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/* Not all paths will gutter the processor... */
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switch(code){
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@ -482,9 +471,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
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unsigned long fault_space = 0;
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int si_code;
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if (code == 1)
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pdc_console_restart(); /* switch back to pdc if HPMC */
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else if (!irqs_disabled_flags(regs->gr[0]))
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if (!irqs_disabled_flags(regs->gr[0]))
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local_irq_enable();
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/* Security check:
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@ -602,21 +602,6 @@ config SERIAL_MUX_CONSOLE
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select SERIAL_CORE_CONSOLE
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default y
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config PDC_CONSOLE
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bool "PDC software console support"
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depends on PARISC && !SERIAL_MUX && VT
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help
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Saying Y here will enable the software based PDC console to be
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used as the system console. This is useful for machines in
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which the hardware based console has not been written yet. The
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following steps must be completed to use the PDC console:
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1. create the device entry (mknod /dev/ttyB0 c 11 0)
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2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
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3. Add device ttyB0 to /etc/securetty (if you want to log on as
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root on this console.)
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4. Change the kernel command console parameter to: console=ttyB0
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config SERIAL_SUNSAB
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tristate "Sun Siemens SAB82532 serial support"
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depends on SPARC && PCI
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@ -121,7 +121,7 @@ config KDB_DEFAULT_ENABLE
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config KDB_KEYBOARD
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bool "KGDB_KDB: keyboard as input device"
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depends on VT && KGDB_KDB
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depends on VT && KGDB_KDB && !PARISC
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default n
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help
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KDB can use a PS/2 type keyboard for an input device
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