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_LPAR_HVSI) 35 /* For LPAR machines that have an HVSI console on vterm 0 */ 36 udbg_init_debug_lpar_hvsi(); 37 #elif defined(CONFIG_PPC_EARLY_DEBUG_G5) 38 /* For use on Apple G5 machines */ 39 udbg_init_pmac_realmode(); 40 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL) 41 /* RTAS panel debug */ 42 udbg_init_rtas_panel(); 43 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE) 44 /* RTAS console debug */ 45 udbg_init_rtas_console(); 46 #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) 47 /* Maple real mode debug */ 48 udbg_init_maple_realmode(); 49 #elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES) 50 /* For iSeries - hit Ctrl-x Ctrl-x to see the output */ 51 udbg_init_iseries(); 52 #elif defined(CONFIG_PPC_EARLY_DEBUG_BEAT) 53 udbg_init_debug_beat(); 54 #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE) 55 udbg_init_pas_realmode(); 56 #elif defined(CONFIG_BOOTX_TEXT) 57 udbg_init_btext(); 58 #elif defined(CONFIG_PPC_EARLY_DEBUG_44x) 59 /* PPC44x debug */ 60 udbg_init_44x_as1(); 61 #elif defined(CONFIG_PPC_EARLY_DEBUG_40x) 62 /* PPC40x debug */ 63 udbg_init_40x_realmode(); 64 #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM) 65 udbg_init_cpm(); 66 #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO) 67 udbg_init_usbgecko(); 68 #elif defined(CONFIG_PPC_EARLY_DEBUG_WSP) 69 udbg_init_wsp(); 70 #endif 71 72 #ifdef CONFIG_PPC_EARLY_DEBUG 73 console_loglevel = 10; 74 75 register_early_udbg_console(); 76 #endif 77 } 78 79 /* udbg library, used by xmon et al */ 80 void udbg_puts(const char *s) 81 { 82 if (udbg_putc) { 83 char c; 84 85 if (s && *s != '\0') { 86 while ((c = *s++) != '\0') 87 udbg_putc(c); 88 } 89 90 if (udbg_flush) 91 udbg_flush(); 92 } 93 #if 0 94 else { 95 printk("%s", s); 96 } 97 #endif 98 } 99 100 int udbg_write(const char *s, int n) 101 { 102 int remain = n; 103 char c; 104 105 if (!udbg_putc) 106 return 0; 107 108 if (s && *s != '\0') { 109 while (((c = *s++) != '\0') && (remain-- > 0)) { 110 udbg_putc(c); 111 } 112 } 113 114 if (udbg_flush) 115 udbg_flush(); 116 117 return n - remain; 118 } 119 120 int udbg_read(char *buf, int buflen) 121 { 122 char *p = buf; 123 int i, c; 124 125 if (!udbg_getc) 126 return 0; 127 128 for (i = 0; i < buflen; ++i) { 129 do { 130 c = udbg_getc(); 131 if (c == -1 && i == 0) 132 return -1; 133 134 } while (c == 0x11 || c == 0x13); 135 if (c == 0 || c == -1) 136 break; 137 *p++ = c; 138 } 139 140 return i; 141 } 142 143 #define UDBG_BUFSIZE 256 144 void udbg_printf(const char *fmt, ...) 145 { 146 char buf[UDBG_BUFSIZE]; 147 va_list args; 148 149 va_start(args, fmt); 150 vsnprintf(buf, UDBG_BUFSIZE, fmt, args); 151 udbg_puts(buf); 152 va_end(args); 153 } 154 155 void __init udbg_progress(char *s, unsigned short hex) 156 { 157 udbg_puts(s); 158 udbg_puts("\n"); 159 } 160 161 /* 162 * Early boot console based on udbg 163 */ 164 static void udbg_console_write(struct console *con, const char *s, 165 unsigned int n) 166 { 167 udbg_write(s, n); 168 } 169 170 static struct console udbg_console = { 171 .name = "udbg", 172 .write = udbg_console_write, 173 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME, 174 .index = 0, 175 }; 176 177 static int early_console_initialized; 178 179 /* 180 * Called by setup_system after ppc_md->probe and ppc_md->early_init. 181 * Call it again after setting udbg_putc in ppc_md->setup_arch. 182 */ 183 void __init register_early_udbg_console(void) 184 { 185 if (early_console_initialized) 186 return; 187 188 if (!udbg_putc) 189 return; 190 191 if (strstr(boot_command_line, "udbg-immortal")) { 192 printk(KERN_INFO "early console immortal !\n"); 193 udbg_console.flags &= ~CON_BOOT; 194 } 195 early_console_initialized = 1; 196 register_console(&udbg_console); 197 } 198 199 #if 0 /* if you want to use this as a regular output console */ 200 console_initcall(register_udbg_console); 201 #endif 202