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267 lines
7.0 KiB
267 lines
7.0 KiB
// 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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* |
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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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* 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/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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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 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 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 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(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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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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pdc_console_tty_driver = alloc_tty_driver(1); |
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if (!pdc_console_tty_driver) |
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return -ENOMEM; |
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tty_port_init(&tty_port); |
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pdc_console_tty_driver->driver_name = "pdc_cons"; |
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pdc_console_tty_driver->name = "ttyB"; |
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pdc_console_tty_driver->major = MUX_MAJOR; |
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pdc_console_tty_driver->minor_start = 0; |
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pdc_console_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM; |
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pdc_console_tty_driver->init_termios = tty_std_termios; |
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pdc_console_tty_driver->flags = TTY_DRIVER_REAL_RAW | |
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TTY_DRIVER_RESET_TERMIOS; |
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tty_set_operations(pdc_console_tty_driver, &pdc_console_tty_ops); |
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tty_port_link_device(&tty_port, pdc_console_tty_driver, 0); |
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err = tty_register_driver(pdc_console_tty_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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return err; |
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} |
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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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{ |
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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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