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_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 #elif defined(CONFIG_PPC_EARLY_DEBUG_WSP) 66 udbg_init_wsp(); 67 #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC) 68 udbg_init_ehv_bc(); 69 #elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC) 70 udbg_init_ps3gelic(); 71 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW) 72 udbg_init_debug_opal_raw(); 73 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI) 74 udbg_init_debug_opal_hvsi(); 75 #endif 76 77 #ifdef CONFIG_PPC_EARLY_DEBUG 78 console_loglevel = 10; 79 80 register_early_udbg_console(); 81 #endif 82 } 83 84 /* udbg library, used by xmon et al */ 85 void udbg_puts(const char *s) 86 { 87 if (udbg_putc) { 88 char c; 89 90 if (s && *s != '\0') { 91 while ((c = *s++) != '\0') 92 udbg_putc(c); 93 } 94 95 if (udbg_flush) 96 udbg_flush(); 97 } 98 #if 0 99 else { 100 printk("%s", s); 101 } 102 #endif 103 } 104 105 int udbg_write(const char *s, int n) 106 { 107 int remain = n; 108 char c; 109 110 if (!udbg_putc) 111 return 0; 112 113 if (s && *s != '\0') { 114 while (((c = *s++) != '\0') && (remain-- > 0)) { 115 udbg_putc(c); 116 } 117 } 118 119 if (udbg_flush) 120 udbg_flush(); 121 122 return n - remain; 123 } 124 125 int udbg_read(char *buf, int buflen) 126 { 127 char *p = buf; 128 int i, c; 129 130 if (!udbg_getc) 131 return 0; 132 133 for (i = 0; i < buflen; ++i) { 134 do { 135 c = udbg_getc(); 136 if (c == -1 && i == 0) 137 return -1; 138 139 } while (c == 0x11 || c == 0x13); 140 if (c == 0 || c == -1) 141 break; 142 *p++ = c; 143 } 144 145 return i; 146 } 147 148 #define UDBG_BUFSIZE 256 149 void udbg_printf(const char *fmt, ...) 150 { 151 char buf[UDBG_BUFSIZE]; 152 va_list args; 153 154 va_start(args, fmt); 155 vsnprintf(buf, UDBG_BUFSIZE, fmt, args); 156 udbg_puts(buf); 157 va_end(args); 158 } 159 160 void __init udbg_progress(char *s, unsigned short hex) 161 { 162 udbg_puts(s); 163 udbg_puts("\n"); 164 } 165 166 /* 167 * Early boot console based on udbg 168 */ 169 static void udbg_console_write(struct console *con, const char *s, 170 unsigned int n) 171 { 172 udbg_write(s, n); 173 } 174 175 static struct console udbg_console = { 176 .name = "udbg", 177 .write = udbg_console_write, 178 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME, 179 .index = 0, 180 }; 181 182 static int early_console_initialized; 183 184 /* 185 * Called by setup_system after ppc_md->probe and ppc_md->early_init. 186 * Call it again after setting udbg_putc in ppc_md->setup_arch. 187 */ 188 void __init register_early_udbg_console(void) 189 { 190 if (early_console_initialized) 191 return; 192 193 if (!udbg_putc) 194 return; 195 196 if (strstr(boot_command_line, "udbg-immortal")) { 197 printk(KERN_INFO "early console immortal !\n"); 198 udbg_console.flags &= ~CON_BOOT; 199 } 200 early_console_initialized = 1; 201 register_console(&udbg_console); 202 } 203 204 #if 0 /* if you want to use this as a regular output console */ 205 console_initcall(register_udbg_console); 206 #endif 207