1 /* 2 * polling mode stateless debugging stuff, originally for NS16550 Serial Ports 3 * 4 * c 2001 PPC 64 Team, IBM Corp 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <stdarg.h> 13 #include <linux/types.h> 14 #include <linux/sched.h> 15 #include <linux/console.h> 16 #include <linux/init.h> 17 #include <asm/processor.h> 18 #include <asm/udbg.h> 19 20 void (*udbg_putc)(char c); 21 void (*udbg_flush)(void); 22 int (*udbg_getc)(void); 23 int (*udbg_getc_poll)(void); 24 25 /* 26 * Early debugging facilities. You can enable _one_ of these via .config, 27 * if you do so your kernel _will not boot_ on anything else. Be careful. 28 */ 29 void __init udbg_early_init(void) 30 { 31 #if defined(CONFIG_PPC_EARLY_DEBUG_LPAR) 32 /* For LPAR machines that have an HVC console on vterm 0 */ 33 udbg_init_debug_lpar(); 34 #elif defined(CONFIG_PPC_EARLY_DEBUG_G5) 35 /* For use on Apple G5 machines */ 36 udbg_init_pmac_realmode(); 37 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL) 38 /* RTAS panel debug */ 39 udbg_init_rtas_panel(); 40 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE) 41 /* RTAS console debug */ 42 udbg_init_rtas_console(); 43 #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) 44 /* Maple real mode debug */ 45 udbg_init_maple_realmode(); 46 #elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES) 47 /* For iSeries - hit Ctrl-x Ctrl-x to see the output */ 48 udbg_init_iseries(); 49 #elif defined(CONFIG_PPC_EARLY_DEBUG_BEAT) 50 udbg_init_debug_beat(); 51 #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE) 52 udbg_init_pas_realmode(); 53 #elif defined(CONFIG_BOOTX_TEXT) 54 udbg_init_btext(); 55 #elif defined(CONFIG_PPC_EARLY_DEBUG_44x) 56 /* PPC44x debug */ 57 udbg_init_44x_as1(); 58 #elif defined(CONFIG_PPC_EARLY_DEBUG_40x) 59 /* PPC40x debug */ 60 udbg_init_40x_realmode(); 61 #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM) 62 udbg_init_cpm(); 63 #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO) 64 udbg_init_usbgecko(); 65 #endif 66 67 #ifdef CONFIG_PPC_EARLY_DEBUG 68 console_loglevel = 10; 69 #endif 70 } 71 72 /* udbg library, used by xmon et al */ 73 void udbg_puts(const char *s) 74 { 75 if (udbg_putc) { 76 char c; 77 78 if (s && *s != '\0') { 79 while ((c = *s++) != '\0') 80 udbg_putc(c); 81 } 82 83 if (udbg_flush) 84 udbg_flush(); 85 } 86 #if 0 87 else { 88 printk("%s", s); 89 } 90 #endif 91 } 92 93 int udbg_write(const char *s, int n) 94 { 95 int remain = n; 96 char c; 97 98 if (!udbg_putc) 99 return 0; 100 101 if (s && *s != '\0') { 102 while (((c = *s++) != '\0') && (remain-- > 0)) { 103 udbg_putc(c); 104 } 105 } 106 107 if (udbg_flush) 108 udbg_flush(); 109 110 return n - remain; 111 } 112 113 int udbg_read(char *buf, int buflen) 114 { 115 char *p = buf; 116 int i, c; 117 118 if (!udbg_getc) 119 return 0; 120 121 for (i = 0; i < buflen; ++i) { 122 do { 123 c = udbg_getc(); 124 if (c == -1 && i == 0) 125 return -1; 126 127 } while (c == 0x11 || c == 0x13); 128 if (c == 0 || c == -1) 129 break; 130 *p++ = c; 131 } 132 133 return i; 134 } 135 136 #define UDBG_BUFSIZE 256 137 void udbg_printf(const char *fmt, ...) 138 { 139 char buf[UDBG_BUFSIZE]; 140 va_list args; 141 142 va_start(args, fmt); 143 vsnprintf(buf, UDBG_BUFSIZE, fmt, args); 144 udbg_puts(buf); 145 va_end(args); 146 } 147 148 void __init udbg_progress(char *s, unsigned short hex) 149 { 150 udbg_puts(s); 151 udbg_puts("\n"); 152 } 153 154 /* 155 * Early boot console based on udbg 156 */ 157 static void udbg_console_write(struct console *con, const char *s, 158 unsigned int n) 159 { 160 udbg_write(s, n); 161 } 162 163 static struct console udbg_console = { 164 .name = "udbg", 165 .write = udbg_console_write, 166 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME, 167 .index = 0, 168 }; 169 170 static int early_console_initialized; 171 172 /* 173 * Called by setup_system after ppc_md->probe and ppc_md->early_init. 174 * Call it again after setting udbg_putc in ppc_md->setup_arch. 175 */ 176 void __init register_early_udbg_console(void) 177 { 178 if (early_console_initialized) 179 return; 180 181 if (!udbg_putc) 182 return; 183 184 if (strstr(boot_command_line, "udbg-immortal")) { 185 printk(KERN_INFO "early console immortal !\n"); 186 udbg_console.flags &= ~CON_BOOT; 187 } 188 early_console_initialized = 1; 189 register_console(&udbg_console); 190 } 191 192 #if 0 /* if you want to use this as a regular output console */ 193 console_initcall(register_udbg_console); 194 #endif 195