Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 1996 Paul Mackerras. |
| 3 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/string.h> |
| 5 | #include <asm/machdep.h> |
| 6 | #include <asm/io.h> |
| 7 | #include <asm/page.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/kernel.h> |
| 9 | #include <linux/errno.h> |
| 10 | #include <linux/sysrq.h> |
| 11 | #include <linux/bitops.h> |
| 12 | #include <asm/xmon.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <asm/machdep.h> |
| 14 | #include <asm/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <asm/processor.h> |
| 16 | #include <asm/delay.h> |
| 17 | #include <asm/btext.h> |
Josh Boyer | b7e8921 | 2006-09-07 13:27:58 -0500 | [diff] [blame] | 18 | #include <asm/ibm4xx.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | static volatile unsigned char *sccc, *sccd; |
| 21 | unsigned int TXRDY, RXRDY, DLAB; |
| 22 | static int xmon_expect(const char *str, unsigned int timeout); |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | static int via_modem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #define TB_SPEED 25000000 |
| 27 | |
| 28 | static inline unsigned int readtb(void) |
| 29 | { |
| 30 | unsigned int ret; |
| 31 | |
| 32 | asm volatile("mftb %0" : "=r" (ret) :); |
| 33 | return ret; |
| 34 | } |
| 35 | |
| 36 | void buf_access(void) |
| 37 | { |
| 38 | if (DLAB) |
| 39 | sccd[3] &= ~DLAB; /* reset DLAB */ |
| 40 | } |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #ifdef CONFIG_MAGIC_SYSRQ |
| 44 | static void sysrq_handle_xmon(int key, struct pt_regs *regs, |
| 45 | struct tty_struct *tty) |
| 46 | { |
| 47 | xmon(regs); |
| 48 | } |
| 49 | |
| 50 | static struct sysrq_key_op sysrq_xmon_op = |
| 51 | { |
| 52 | .handler = sysrq_handle_xmon, |
| 53 | .help_msg = "Xmon", |
| 54 | .action_msg = "Entering xmon", |
| 55 | }; |
| 56 | #endif |
| 57 | |
| 58 | void |
| 59 | xmon_map_scc(void) |
| 60 | { |
Adrian Bunk | c536531 | 2007-01-14 10:15:00 +0100 | [diff] [blame] | 61 | #if defined(CONFIG_405GP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | sccd = (volatile unsigned char *)0xef600300; |
Josh Boyer | b7e8921 | 2006-09-07 13:27:58 -0500 | [diff] [blame] | 63 | #elif defined(CONFIG_440EP) |
| 64 | sccd = (volatile unsigned char *) ioremap(PPC440EP_UART0_ADDR, 8); |
| 65 | #elif defined(CONFIG_440SP) |
| 66 | sccd = (volatile unsigned char *) ioremap64(PPC440SP_UART0_ADDR, 8); |
| 67 | #elif defined(CONFIG_440SPE) |
| 68 | sccd = (volatile unsigned char *) ioremap64(PPC440SPE_UART0_ADDR, 8); |
| 69 | #elif defined(CONFIG_44x) |
| 70 | /* This is the default for 44x platforms. Any boards that have a |
| 71 | different UART address need to be put in cases before this or the |
| 72 | port will be mapped incorrectly */ |
| 73 | sccd = (volatile unsigned char *) ioremap64(PPC440GP_UART0_ADDR, 8); |
| 74 | #endif /* platform */ |
| 75 | |
| 76 | #ifndef CONFIG_PPC_PREP |
| 77 | sccc = sccd + 5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | TXRDY = 0x20; |
| 79 | RXRDY = 1; |
| 80 | DLAB = 0x80; |
Josh Boyer | b7e8921 | 2006-09-07 13:27:58 -0500 | [diff] [blame] | 81 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | register_sysrq_key('x', &sysrq_xmon_op); |
| 84 | } |
| 85 | |
Olaf Hering | c57914a | 2006-02-21 21:06:41 +0100 | [diff] [blame] | 86 | static int scc_initialized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | void xmon_init_scc(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | int |
| 91 | xmon_write(void *handle, void *ptr, int nb) |
| 92 | { |
| 93 | char *p = ptr; |
| 94 | int i, c, ct; |
| 95 | |
| 96 | #ifdef CONFIG_SMP |
| 97 | static unsigned long xmon_write_lock; |
| 98 | int lock_wait = 1000000; |
| 99 | int locked; |
| 100 | |
| 101 | while ((locked = test_and_set_bit(0, &xmon_write_lock)) != 0) |
| 102 | if (--lock_wait == 0) |
| 103 | break; |
| 104 | #endif |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | if (!scc_initialized) |
| 107 | xmon_init_scc(); |
| 108 | ct = 0; |
| 109 | for (i = 0; i < nb; ++i) { |
| 110 | while ((*sccc & TXRDY) == 0) |
Olaf Hering | 0728a2f | 2006-02-11 18:21:47 +0100 | [diff] [blame] | 111 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | c = p[i]; |
| 113 | if (c == '\n' && !ct) { |
| 114 | c = '\r'; |
| 115 | ct = 1; |
| 116 | --i; |
| 117 | } else { |
| 118 | ct = 0; |
| 119 | } |
| 120 | buf_access(); |
| 121 | *sccd = c; |
| 122 | eieio(); |
| 123 | } |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | #ifdef CONFIG_SMP |
| 126 | if (!locked) |
| 127 | clear_bit(0, &xmon_write_lock); |
| 128 | #endif |
| 129 | return nb; |
| 130 | } |
| 131 | |
| 132 | int xmon_wants_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | int |
| 136 | xmon_read(void *handle, void *ptr, int nb) |
| 137 | { |
| 138 | char *p = ptr; |
| 139 | int i; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | if (!scc_initialized) |
| 142 | xmon_init_scc(); |
| 143 | for (i = 0; i < nb; ++i) { |
| 144 | while ((*sccc & RXRDY) == 0) |
Olaf Hering | c57914a | 2006-02-21 21:06:41 +0100 | [diff] [blame] | 145 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | buf_access(); |
| 147 | *p++ = *sccd; |
| 148 | } |
| 149 | return i; |
| 150 | } |
| 151 | |
| 152 | int |
| 153 | xmon_read_poll(void) |
| 154 | { |
| 155 | if ((*sccc & RXRDY) == 0) { |
Olaf Hering | c57914a | 2006-02-21 21:06:41 +0100 | [diff] [blame] | 156 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return -1; |
| 158 | } |
| 159 | buf_access(); |
| 160 | return *sccd; |
| 161 | } |
| 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | void |
| 164 | xmon_init_scc(void) |
| 165 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | scc_initialized = 1; |
| 167 | if (via_modem) { |
| 168 | for (;;) { |
| 169 | xmon_write(NULL, "ATE1V1\r", 7); |
| 170 | if (xmon_expect("OK", 5)) { |
| 171 | xmon_write(NULL, "ATA\r", 4); |
| 172 | if (xmon_expect("CONNECT", 40)) |
| 173 | break; |
| 174 | } |
| 175 | xmon_write(NULL, "+++", 3); |
| 176 | xmon_expect("OK", 3); |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | void *xmon_stdin; |
| 183 | void *xmon_stdout; |
| 184 | void *xmon_stderr; |
| 185 | |
| 186 | void |
Paul Mackerras | fd582ec | 2005-10-11 22:08:12 +1000 | [diff] [blame] | 187 | xmon_init(int arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
Paul Mackerras | fd582ec | 2005-10-11 22:08:12 +1000 | [diff] [blame] | 189 | xmon_map_scc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | int |
| 193 | xmon_putc(int c, void *f) |
| 194 | { |
| 195 | char ch = c; |
| 196 | |
| 197 | if (c == '\n') |
| 198 | xmon_putc('\r', f); |
| 199 | return xmon_write(f, &ch, 1) == 1? c: -1; |
| 200 | } |
| 201 | |
| 202 | int |
| 203 | xmon_putchar(int c) |
| 204 | { |
| 205 | return xmon_putc(c, xmon_stdout); |
| 206 | } |
| 207 | |
| 208 | int |
| 209 | xmon_fputs(char *str, void *f) |
| 210 | { |
| 211 | int n = strlen(str); |
| 212 | |
| 213 | return xmon_write(f, str, n) == n? 0: -1; |
| 214 | } |
| 215 | |
| 216 | int |
| 217 | xmon_readchar(void) |
| 218 | { |
| 219 | char ch; |
| 220 | |
| 221 | for (;;) { |
| 222 | switch (xmon_read(xmon_stdin, &ch, 1)) { |
| 223 | case 1: |
| 224 | return ch; |
| 225 | case -1: |
| 226 | xmon_printf("read(stdin) returned -1\r\n", 0, 0); |
| 227 | return -1; |
| 228 | } |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | static char line[256]; |
| 233 | static char *lineptr; |
| 234 | static int lineleft; |
| 235 | |
| 236 | int xmon_expect(const char *str, unsigned int timeout) |
| 237 | { |
| 238 | int c; |
| 239 | unsigned int t0; |
| 240 | |
| 241 | timeout *= TB_SPEED; |
| 242 | t0 = readtb(); |
| 243 | do { |
| 244 | lineptr = line; |
| 245 | for (;;) { |
| 246 | c = xmon_read_poll(); |
| 247 | if (c == -1) { |
| 248 | if (readtb() - t0 > timeout) |
| 249 | return 0; |
| 250 | continue; |
| 251 | } |
| 252 | if (c == '\n') |
| 253 | break; |
| 254 | if (c != '\r' && lineptr < &line[sizeof(line) - 1]) |
| 255 | *lineptr++ = c; |
| 256 | } |
| 257 | *lineptr = 0; |
| 258 | } while (strstr(line, str) == NULL); |
| 259 | return 1; |
| 260 | } |
| 261 | |
| 262 | int |
| 263 | xmon_getchar(void) |
| 264 | { |
| 265 | int c; |
| 266 | |
| 267 | if (lineleft == 0) { |
| 268 | lineptr = line; |
| 269 | for (;;) { |
| 270 | c = xmon_readchar(); |
| 271 | if (c == -1 || c == 4) |
| 272 | break; |
| 273 | if (c == '\r' || c == '\n') { |
| 274 | *lineptr++ = '\n'; |
| 275 | xmon_putchar('\n'); |
| 276 | break; |
| 277 | } |
| 278 | switch (c) { |
| 279 | case 0177: |
| 280 | case '\b': |
| 281 | if (lineptr > line) { |
| 282 | xmon_putchar('\b'); |
| 283 | xmon_putchar(' '); |
| 284 | xmon_putchar('\b'); |
| 285 | --lineptr; |
| 286 | } |
| 287 | break; |
| 288 | case 'U' & 0x1F: |
| 289 | while (lineptr > line) { |
| 290 | xmon_putchar('\b'); |
| 291 | xmon_putchar(' '); |
| 292 | xmon_putchar('\b'); |
| 293 | --lineptr; |
| 294 | } |
| 295 | break; |
| 296 | default: |
| 297 | if (lineptr >= &line[sizeof(line) - 1]) |
| 298 | xmon_putchar('\a'); |
| 299 | else { |
| 300 | xmon_putchar(c); |
| 301 | *lineptr++ = c; |
| 302 | } |
| 303 | } |
| 304 | } |
| 305 | lineleft = lineptr - line; |
| 306 | lineptr = line; |
| 307 | } |
| 308 | if (lineleft == 0) |
| 309 | return -1; |
| 310 | --lineleft; |
| 311 | return *lineptr++; |
| 312 | } |
| 313 | |
| 314 | char * |
| 315 | xmon_fgets(char *str, int nb, void *f) |
| 316 | { |
| 317 | char *p; |
| 318 | int c; |
| 319 | |
| 320 | for (p = str; p < str + nb - 1; ) { |
| 321 | c = xmon_getchar(); |
| 322 | if (c == -1) { |
| 323 | if (p == str) |
| 324 | return NULL; |
| 325 | break; |
| 326 | } |
| 327 | *p++ = c; |
| 328 | if (c == '\n') |
| 329 | break; |
| 330 | } |
| 331 | *p = 0; |
| 332 | return str; |
| 333 | } |
| 334 | |
| 335 | void |
| 336 | xmon_enter(void) |
| 337 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | void |
| 341 | xmon_leave(void) |
| 342 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |