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 #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC) 71 udbg_init_ehv_bc(); 72 #endif 73 74 #ifdef CONFIG_PPC_EARLY_DEBUG 75 console_loglevel = 10; 76 77 register_early_udbg_console(); 78 #endif 79 } 80 81 /* udbg library, used by xmon et al */ 82 void udbg_puts(const char *s) 83 { 84 if (udbg_putc) { 85 char c; 86 87 if (s && *s != '\0') { 88 while ((c = *s++) != '\0') 89 udbg_putc(c); 90 } 91 92 if (udbg_flush) 93 udbg_flush(); 94 } 95 #if 0 96 else { 97 printk("%s", s); 98 } 99 #endif 100 } 101 102 int udbg_write(const char *s, int n) 103 { 104 int remain = n; 105 char c; 106 107 if (!udbg_putc) 108 return 0; 109 110 if (s && *s != '\0') { 111 while (((c = *s++) != '\0') && (remain-- > 0)) { 112 udbg_putc(c); 113 } 114 } 115 116 if (udbg_flush) 117 udbg_flush(); 118 119 return n - remain; 120 } 121 122 int udbg_read(char *buf, int buflen) 123 { 124 char *p = buf; 125 int i, c; 126 127 if (!udbg_getc) 128 return 0; 129 130 for (i = 0; i < buflen; ++i) { 131 do { 132 c = udbg_getc(); 133 if (c == -1 && i == 0) 134 return -1; 135 136 } while (c == 0x11 || c == 0x13); 137 if (c == 0 || c == -1) 138 break; 139 *p++ = c; 140 } 141 142 return i; 143 } 144 145 #define UDBG_BUFSIZE 256 146 void udbg_printf(const char *fmt, ...) 147 { 148 char buf[UDBG_BUFSIZE]; 149 va_list args; 150 151 va_start(args, fmt); 152 vsnprintf(buf, UDBG_BUFSIZE, fmt, args); 153 udbg_puts(buf); 154 va_end(args); 155 } 156 157 void __init udbg_progress(char *s, unsigned short hex) 158 { 159 udbg_puts(s); 160 udbg_puts("\n"); 161 } 162 163 /* 164 * Early boot console based on udbg 165 */ 166 static void udbg_console_write(struct console *con, const char *s, 167 unsigned int n) 168 { 169 udbg_write(s, n); 170 } 171 172 static struct console udbg_console = { 173 .name = "udbg", 174 .write = udbg_console_write, 175 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME, 176 .index = 0, 177 }; 178 179 static int early_console_initialized; 180 181 /* 182 * Called by setup_system after ppc_md->probe and ppc_md->early_init. 183 * Call it again after setting udbg_putc in ppc_md->setup_arch. 184 */ 185 void __init register_early_udbg_console(void) 186 { 187 if (early_console_initialized) 188 return; 189 190 if (!udbg_putc) 191 return; 192 193 if (strstr(boot_command_line, "udbg-immortal")) { 194 printk(KERN_INFO "early console immortal !\n"); 195 udbg_console.flags &= ~CON_BOOT; 196 } 197 early_console_initialized = 1; 198 register_console(&udbg_console); 199 } 200 201 #if 0 /* if you want to use this as a regular output console */ 202 console_initcall(register_udbg_console); 203 #endif 204