11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * PDC Console support - ie use firmware to dump text via boot console 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> 51da177e4SLinus Torvalds * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> 61da177e4SLinus Torvalds * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> 71da177e4SLinus Torvalds * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> 81da177e4SLinus Torvalds * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> 91da177e4SLinus Torvalds * Copyright (C) 2000 Michael Ang <mang with subcarrier.org> 101da177e4SLinus Torvalds * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> 111da177e4SLinus Torvalds * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> 121da177e4SLinus Torvalds * Copyright (C) 2001 Helge Deller <deller at parisc-linux.org> 131da177e4SLinus Torvalds * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> 141da177e4SLinus Torvalds * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 181da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 191da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 201da177e4SLinus Torvalds * (at your option) any later version. 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 231da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 241da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 251da177e4SLinus Torvalds * GNU General Public License for more details. 261da177e4SLinus Torvalds * 271da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 281da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 291da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds /* 331da177e4SLinus Torvalds * The PDC console is a simple console, which can be used for debugging 341da177e4SLinus Torvalds * boot related problems on HP PA-RISC machines. 351da177e4SLinus Torvalds * 361da177e4SLinus Torvalds * This code uses the ROM (=PDC) based functions to read and write characters 371da177e4SLinus Torvalds * from and to PDC's boot path. 381da177e4SLinus Torvalds * Since all character read from that path must be polled, this code never 391da177e4SLinus Torvalds * can or will be a fully functional linux console. 401da177e4SLinus Torvalds */ 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds /* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems. 431da177e4SLinus Torvalds * On production kernels EARLY_BOOTUP_DEBUG should be undefined. */ 447c92e972SMatthew Wilcox #define EARLY_BOOTUP_DEBUG 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #include <linux/config.h> 481da177e4SLinus Torvalds #include <linux/kernel.h> 491da177e4SLinus Torvalds #include <linux/console.h> 501da177e4SLinus Torvalds #include <linux/string.h> 511da177e4SLinus Torvalds #include <linux/init.h> 521da177e4SLinus Torvalds #include <linux/major.h> 531da177e4SLinus Torvalds #include <linux/tty.h> 541da177e4SLinus Torvalds #include <asm/pdc.h> /* for iodc_call() proto and friends */ 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds static void pdc_console_write(struct console *co, const char *s, unsigned count) 581da177e4SLinus Torvalds { 591da177e4SLinus Torvalds while(count--) 601da177e4SLinus Torvalds pdc_iodc_putc(*s++); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds void pdc_outc(unsigned char c) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds pdc_iodc_outc(c); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds void pdc_printf(const char *fmt, ...) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds va_list args; 711da177e4SLinus Torvalds char buf[1024]; 721da177e4SLinus Torvalds int i, len; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds va_start(args, fmt); 751da177e4SLinus Torvalds len = vscnprintf(buf, sizeof(buf), fmt, args); 761da177e4SLinus Torvalds va_end(args); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds for (i = 0; i < len; i++) 791da177e4SLinus Torvalds pdc_iodc_outc(buf[i]); 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds int pdc_console_poll_key(struct console *co) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds return pdc_iodc_getc(); 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds static int pdc_console_setup(struct console *co, char *options) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds return 0; 901da177e4SLinus Torvalds } 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds #if defined(CONFIG_PDC_CONSOLE) 931da177e4SLinus Torvalds static struct tty_driver * pdc_console_device (struct console *c, int *index) 941da177e4SLinus Torvalds { 951da177e4SLinus Torvalds extern struct tty_driver console_driver; 961da177e4SLinus Torvalds *index = c->index ? c->index-1 : fg_console; 971da177e4SLinus Torvalds return &console_driver; 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds #else 1007c92e972SMatthew Wilcox #define pdc_console_device NULL 1011da177e4SLinus Torvalds #endif 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds static struct console pdc_cons = { 1041da177e4SLinus Torvalds .name = "ttyB", 1051da177e4SLinus Torvalds .write = pdc_console_write, 1067c92e972SMatthew Wilcox .device = pdc_console_device, 1071da177e4SLinus Torvalds .setup = pdc_console_setup, 1081da177e4SLinus Torvalds .flags = CON_BOOT | CON_PRINTBUFFER | CON_ENABLED, 1091da177e4SLinus Torvalds .index = -1, 1101da177e4SLinus Torvalds }; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds static int pdc_console_initialized; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds static void pdc_console_init_force(void) 1151da177e4SLinus Torvalds { 1161da177e4SLinus Torvalds if (pdc_console_initialized) 1171da177e4SLinus Torvalds return; 1181da177e4SLinus Torvalds ++pdc_console_initialized; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds /* If the console is duplex then copy the COUT parameters to CIN. */ 1211da177e4SLinus Torvalds if (PAGE0->mem_cons.cl_class == CL_DUPLEX) 1221da177e4SLinus Torvalds memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons)); 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* register the pdc console */ 1251da177e4SLinus Torvalds register_console(&pdc_cons); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds void __init pdc_console_init(void) 1291da177e4SLinus Torvalds { 1301da177e4SLinus Torvalds #if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE) 1311da177e4SLinus Torvalds pdc_console_init_force(); 1321da177e4SLinus Torvalds #endif 1331da177e4SLinus Torvalds #ifdef EARLY_BOOTUP_DEBUG 1341da177e4SLinus Torvalds printk(KERN_INFO "Initialized PDC Console for debugging.\n"); 1351da177e4SLinus Torvalds #endif 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* 1401da177e4SLinus Torvalds * Used for emergencies. Currently only used if an HPMC occurs. If an 1411da177e4SLinus Torvalds * HPMC occurs, it is possible that the current console may not be 1427c92e972SMatthew Wilcox * properly initialised after the PDC IO reset. This routine unregisters 1437c92e972SMatthew Wilcox * all of the current consoles, reinitializes the pdc console and 1441da177e4SLinus Torvalds * registers it. 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds void pdc_console_restart(void) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds struct console *console; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds if (pdc_console_initialized) 1521da177e4SLinus Torvalds return; 1531da177e4SLinus Torvalds 1547c92e972SMatthew Wilcox /* If we've already seen the output, don't bother to print it again */ 1557c92e972SMatthew Wilcox if (console_drivers != NULL) 1567c92e972SMatthew Wilcox pdc_cons.flags &= ~CON_PRINTBUFFER; 1577c92e972SMatthew Wilcox 1581da177e4SLinus Torvalds while ((console = console_drivers) != NULL) 1591da177e4SLinus Torvalds unregister_console(console_drivers); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* force registering the pdc console */ 1621da177e4SLinus Torvalds pdc_console_init_force(); 1631da177e4SLinus Torvalds } 164