Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | /* * 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> * * * 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. * * This code uses the ROM (=PDC) based functions to read and write characters * from and to PDC's boot path. * Since all character read from that path must be polled, this code never * can or will be a fully functional linux console. */ /* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems. * On production kernels EARLY_BOOTUP_DEBUG should be undefined. */ #undef EARLY_BOOTUP_DEBUG #include <linux/config.h> #include <linux/kernel.h> #include <linux/console.h> #include <linux/string.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/major.h> #include <linux/tty.h> #include <asm/page.h> #include <asm/types.h> #include <asm/system.h> #include <asm/pdc.h> /* for iodc_call() proto and friends */ static void pdc_console_write(struct console *co, const char *s, unsigned count) { while(count--) pdc_iodc_putc(*s++); } void pdc_outc(unsigned char c) { pdc_iodc_outc(c); } void pdc_printf(const char *fmt, ...) { va_list args; char buf[1024]; int i, len; va_start(args, fmt); len = vscnprintf(buf, sizeof(buf), fmt, args); va_end(args); for (i = 0; i < len; i++) pdc_iodc_outc(buf[i]); } int pdc_console_poll_key(struct console *co) { return pdc_iodc_getc(); } static int pdc_console_setup(struct console *co, char *options) { return 0; } #if defined(CONFIG_PDC_CONSOLE) #define PDC_CONSOLE_DEVICE pdc_console_device static struct tty_driver * pdc_console_device (struct console *c, int *index) { extern struct tty_driver console_driver; *index = c->index ? c->index-1 : fg_console; return &console_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|CON_ENABLED, .index = -1, }; static int pdc_console_initialized; extern unsigned long con_start; /* kernel/printk.c */ extern unsigned long log_end; /* kernel/printk.c */ 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 } /* Unregister the pdc console with the printk console layer */ void pdc_console_die(void) { if (!pdc_console_initialized) return; --pdc_console_initialized; printk(KERN_INFO "Switching from PDC console\n"); /* Don't repeat what we've already printed */ con_start = log_end; unregister_console(&pdc_cons); } /* * 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 initialed 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; while ((console = console_drivers) != NULL) unregister_console(console_drivers); /* Don't repeat what we've already printed */ con_start = log_end; /* force registering the pdc console */ pdc_console_init_force(); } |