arch/ppc/xmon/start.c

   1 /*
   2  * Copyright (C) 1996 Paul Mackerras.
   3  */
   4 #include <linux/config.h>
   5 #include <linux/string.h>
   6 #include <asm/machdep.h>
   7 #include <asm/io.h>
   8 #include <asm/page.h>
   9 #include <linux/adb.h>
  10 #include <linux/pmu.h>
  11 #include <linux/cuda.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/sysrq.h>
  15 #include <linux/bitops.h>
  16 #include <asm/xmon.h>
  17 #include <asm/prom.h>
  18 #include <asm/bootx.h>
  19 #include <asm/machdep.h>
  20 #include <asm/errno.h>
  21 #include <asm/pmac_feature.h>
  22 #include <asm/processor.h>
  23 #include <asm/delay.h>
  24 #include <asm/btext.h>
  25
  26 static volatile unsigned char *sccc, *sccd;
  27 unsigned int TXRDY, RXRDY, DLAB;
  28 static int xmon_expect(const char *str, unsigned int timeout);
  29
  30 static int use_serial;
  31 static int use_screen;
  32 static int via_modem;
  33 static int xmon_use_sccb;
  34 static struct device_node *channel_node;
  35
  36 #define TB_SPEED        25000000
  37
  38 static inline unsigned int readtb(void)
  39 {
  40         unsigned int ret;
  41
  42         asm volatile("mftb %0" : "=r" (ret) :);
  43         return ret;
  44 }
  45
  46 void buf_access(void)
  47 {
  48         if (DLAB)
  49                 sccd[3] &= ~DLAB;       /* reset DLAB */
  50 }
  51
  52 extern int adb_init(void);
  53
  54 #ifdef CONFIG_PPC_CHRP
  55 /*
  56  * This looks in the "ranges" property for the primary PCI host bridge
  57  * to find the physical address of the start of PCI/ISA I/O space.
  58  * It is basically a cut-down version of pci_process_bridge_OF_ranges.
  59  */
  60 static unsigned long chrp_find_phys_io_base(void)
  61 {
  62         struct device_node *node;
  63         unsigned int *ranges;
  64         unsigned long base = CHRP_ISA_IO_BASE;
  65         int rlen = 0;
  66         int np;
  67
  68         node = find_devices("isa");
  69         if (node != NULL) {
  70                 node = node->parent;
  71                 if (node == NULL || node->type == NULL
  72                     || strcmp(node->type, "pci") != 0)
  73                         node = NULL;
  74         }
  75         if (node == NULL)
  76                 node = find_devices("pci");
  77         if (node == NULL)
  78                 return base;
  79
  80         ranges = (unsigned int *) get_property(node, "ranges", &rlen);
  81         np = prom_n_addr_cells(node) + 5;
  82         while ((rlen -= np * sizeof(unsigned int)) >= 0) {
  83                 if ((ranges[0] >> 24) == 1 && ranges[2] == 0) {
  84                         /* I/O space starting at 0, grab the phys base */
  85                         base = ranges[np - 3];
  86                         break;
  87                 }
  88                 ranges += np;
  89         }
  90         return base;
  91 }
  92 #endif /* CONFIG_PPC_CHRP */
  93
  94 #ifdef CONFIG_MAGIC_SYSRQ
  95 static void sysrq_handle_xmon(int key, struct pt_regs *regs,
  96                               struct tty_struct *tty)
  97 {
  98         xmon(regs);
  99 }
 100
 101 static struct sysrq_key_op sysrq_xmon_op =
 102 {
 103         .handler =      sysrq_handle_xmon,
 104         .help_msg =     "Xmon",
 105         .action_msg =   "Entering xmon",
 106 };
 107 #endif
 108
 109 void
 110 xmon_map_scc(void)
 111 {
 112 #ifdef CONFIG_PPC_MULTIPLATFORM
 113         volatile unsigned char *base;
 114
 115         if (_machine == _MACH_Pmac) {
 116                 struct device_node *np;
 117                 unsigned long addr;
 118 #ifdef CONFIG_BOOTX_TEXT
 119                 if (!use_screen && !use_serial
 120                     && !machine_is_compatible("iMac")) {
 121                         /* see if there is a keyboard in the device tree
 122                            with a parent of type "adb" */
 123                         for (np = find_devices("keyboard"); np; np = np->next)
 124                                 if (np->parent && np->parent->type
 125                                     && strcmp(np->parent->type, "adb") == 0)
 126                                         break;
 127
 128                         /* needs to be hacked if xmon_printk is to be used
 129                            from within find_via_pmu() */
 130 #ifdef CONFIG_ADB_PMU
 131                         if (np != NULL && boot_text_mapped && find_via_pmu())
 132                                 use_screen = 1;
 133 #endif
 134 #ifdef CONFIG_ADB_CUDA
 135                         if (np != NULL && boot_text_mapped && find_via_cuda())
 136                                 use_screen = 1;
 137 #endif
 138                 }
 139                 if (!use_screen && (np = find_devices("escc")) != NULL) {
 140                         /*
 141                          * look for the device node for the serial port
 142                          * we're using and see if it says it has a modem
 143                          */
 144                         char *name = xmon_use_sccb? "ch-b": "ch-a";
 145                         char *slots;
 146                         int l;
 147
 148                         np = np->child;
 149                         while (np != NULL && strcmp(np->name, name) != 0)
 150                                 np = np->sibling;
 151                         if (np != NULL) {
 152                                 /* XXX should parse this properly */
 153                                 channel_node = np;
 154                                 slots = get_property(np, "slot-names", &l);
 155                                 if (slots != NULL && l >= 10
 156                                     && strcmp(slots+4, "Modem") == 0)
 157                                         via_modem = 1;
 158                         }
 159                 }
 160                 btext_drawstring("xmon uses ");
 161                 if (use_screen)
 162                         btext_drawstring("screen and keyboard\n");
 163                 else {
 164                         if (via_modem)
 165                                 btext_drawstring("modem on ");
 166                         btext_drawstring(xmon_use_sccb? "printer": "modem");
 167                         btext_drawstring(" port\n");
 168                 }
 169
 170 #endif /* CONFIG_BOOTX_TEXT */
 171
 172 #ifdef CHRP_ESCC
 173                 addr = 0xc1013020;
 174 #else
 175                 addr = 0xf3013020;
 176 #endif
 177                 TXRDY = 4;
 178                 RXRDY = 1;
 179
 180                 np = find_devices("mac-io");
 181                 if (np && np->n_addrs)
 182                         addr = np->addrs[0].address + 0x13020;
 183                 base = (volatile unsigned char *) ioremap(addr & PAGE_MASK, PAGE_SIZE);
 184                 sccc = base + (addr & ~PAGE_MASK);
 185                 sccd = sccc + 0x10;
 186
 187         } else {
 188                 base = (volatile unsigned char *) isa_io_base;
 189                 if (_machine == _MACH_chrp)
 190                         base = (volatile unsigned char *)
 191                                 ioremap(chrp_find_phys_io_base(), 0x1000);
 192
 193                 sccc = base + 0x3fd;
 194                 sccd = base + 0x3f8;
 195                 if (xmon_use_sccb) {
 196                         sccc -= 0x100;
 197                         sccd -= 0x100;
 198                 }
 199                 TXRDY = 0x20;
 200                 RXRDY = 1;
 201                 DLAB = 0x80;
 202         }
 203 #elif defined(CONFIG_GEMINI)
 204         /* should already be mapped by the kernel boot */
 205         sccc = (volatile unsigned char *) 0xffeffb0d;
 206         sccd = (volatile unsigned char *) 0xffeffb08;
 207         TXRDY = 0x20;
 208         RXRDY = 1;
 209         DLAB = 0x80;
 210 #elif defined(CONFIG_405GP)
 211         sccc = (volatile unsigned char *)0xef600305;
 212         sccd = (volatile unsigned char *)0xef600300;
 213         TXRDY = 0x20;
 214         RXRDY = 1;
 215         DLAB = 0x80;
 216 #endif /* platform */
 217
 218         register_sysrq_key('x', &sysrq_xmon_op);
 219 }
 220
 221 static int scc_initialized = 0;
 222
 223 void xmon_init_scc(void);
 224 extern void cuda_poll(void);
 225
 226 static inline void do_poll_adb(void)
 227 {
 228 #ifdef CONFIG_ADB_PMU
 229         if (sys_ctrler == SYS_CTRLER_PMU)
 230                 pmu_poll_adb();
 231 #endif /* CONFIG_ADB_PMU */
 232 #ifdef CONFIG_ADB_CUDA
 233         if (sys_ctrler == SYS_CTRLER_CUDA)
 234                 cuda_poll();
 235 #endif /* CONFIG_ADB_CUDA */
 236 }
 237
 238 int
 239 xmon_write(void *handle, void *ptr, int nb)
 240 {
 241         char *p = ptr;
 242         int i, c, ct;
 243
 244 #ifdef CONFIG_SMP
 245         static unsigned long xmon_write_lock;
 246         int lock_wait = 1000000;
 247         int locked;
 248
 249         while ((locked = test_and_set_bit(0, &xmon_write_lock)) != 0)
 250                 if (--lock_wait == 0)
 251                         break;
 252 #endif
 253
 254 #ifdef CONFIG_BOOTX_TEXT
 255         if (use_screen) {
 256                 /* write it on the screen */
 257                 for (i = 0; i < nb; ++i)
 258                         btext_drawchar(*p++);
 259                 goto out;
 260         }
 261 #endif
 262         if (!scc_initialized)
 263                 xmon_init_scc();
 264         ct = 0;
 265         for (i = 0; i < nb; ++i) {
 266                 while ((*sccc & TXRDY) == 0)
 267                         do_poll_adb();
 268                 c = p[i];
 269                 if (c == '\n' && !ct) {
 270                         c = '\r';
 271                         ct = 1;
 272                         --i;
 273                 } else {
 274                         ct = 0;
 275                 }
 276                 buf_access();
 277                 *sccd = c;
 278                 eieio();
 279         }
 280
 281  out:
 282 #ifdef CONFIG_SMP
 283         if (!locked)
 284                 clear_bit(0, &xmon_write_lock);
 285 #endif
 286         return nb;
 287 }
 288
 289 int xmon_wants_key;
 290 int xmon_adb_keycode;
 291
 292 #ifdef CONFIG_BOOTX_TEXT
 293 static int xmon_adb_shiftstate;
 294
 295 static unsigned char xmon_keytab[128] =
 296         "asdfhgzxcv\000bqwer"                           /* 0x00 - 0x0f */
 297         "yt123465=97-80]o"                              /* 0x10 - 0x1f */
 298         "u[ip\rlj'k;\\,/nm."                            /* 0x20 - 0x2f */
 299         "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0"            /* 0x30 - 0x3f */
 300         "\0.\0*\0+\0\0\0\0\0/\r\0-\0"                   /* 0x40 - 0x4f */
 301         "\0\0000123456789\0\0\0";                       /* 0x50 - 0x5f */
 302
 303 static unsigned char xmon_shift_keytab[128] =
 304         "ASDFHGZXCV\000BQWER"                           /* 0x00 - 0x0f */
 305         "YT!@#$^%+(&_*)}O"                              /* 0x10 - 0x1f */
 306         "U{IP\rLJ\"K:|<?NM>"                            /* 0x20 - 0x2f */
 307         "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0"            /* 0x30 - 0x3f */
 308         "\0.\0*\0+\0\0\0\0\0/\r\0-\0"                   /* 0x40 - 0x4f */
 309         "\0\0000123456789\0\0\0";                       /* 0x50 - 0x5f */
 310
 311 static int
 312 xmon_get_adb_key(void)
 313 {
 314         int k, t, on;
 315
 316         xmon_wants_key = 1;
 317         for (;;) {
 318                 xmon_adb_keycode = -1;
 319                 t = 0;
 320                 on = 0;
 321                 do {
 322                         if (--t < 0) {
 323                                 on = 1 - on;
 324                                 btext_drawchar(on? 0xdb: 0x20);
 325                                 btext_drawchar('\b');
 326                                 t = 200000;
 327                         }
 328                         do_poll_adb();
 329                 } while (xmon_adb_keycode == -1);
 330                 k = xmon_adb_keycode;
 331                 if (on)
 332                         btext_drawstring(" \b");
 333
 334                 /* test for shift keys */
 335                 if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
 336                         xmon_adb_shiftstate = (k & 0x80) == 0;
 337                         continue;
 338                 }
 339                 if (k >= 0x80)
 340                         continue;       /* ignore up transitions */
 341                 k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
 342                 if (k != 0)
 343                         break;
 344         }
 345         xmon_wants_key = 0;
 346         return k;
 347 }
 348 #endif /* CONFIG_BOOTX_TEXT */
 349
 350 int
 351 xmon_read(void *handle, void *ptr, int nb)
 352 {
 353     char *p = ptr;
 354     int i;
 355
 356 #ifdef CONFIG_BOOTX_TEXT
 357     if (use_screen) {
 358         for (i = 0; i < nb; ++i)
 359             *p++ = xmon_get_adb_key();
 360         return i;
 361     }
 362 #endif
 363     if (!scc_initialized)
 364         xmon_init_scc();
 365     for (i = 0; i < nb; ++i) {
 366         while ((*sccc & RXRDY) == 0)
 367             do_poll_adb();
 368         buf_access();
 369         *p++ = *sccd;
 370     }
 371     return i;
 372 }
 373
 374 int
 375 xmon_read_poll(void)
 376 {
 377         if ((*sccc & RXRDY) == 0) {
 378                 do_poll_adb();
 379                 return -1;
 380         }
 381         buf_access();
 382         return *sccd;
 383 }
 384
 385 static unsigned char scc_inittab[] = {
 386     13, 0,              /* set baud rate divisor */
 387     12, 1,
 388     14, 1,              /* baud rate gen enable, src=rtxc */
 389     11, 0x50,           /* clocks = br gen */
 390     5,  0xea,           /* tx 8 bits, assert DTR & RTS */
 391     4,  0x46,           /* x16 clock, 1 stop */
 392     3,  0xc1,           /* rx enable, 8 bits */
 393 };
 394
 395 void
 396 xmon_init_scc(void)
 397 {
 398         if ( _machine == _MACH_chrp )
 399         {
 400                 sccd[3] = 0x83; eieio();        /* LCR = 8N1 + DLAB */
 401                 sccd[0] = 12; eieio();          /* DLL = 9600 baud */
 402                 sccd[1] = 0; eieio();
 403                 sccd[2] = 0; eieio();           /* FCR = 0 */
 404                 sccd[3] = 3; eieio();           /* LCR = 8N1 */
 405                 sccd[1] = 0; eieio();           /* IER = 0 */
 406         }
 407         else if ( _machine == _MACH_Pmac )
 408         {
 409                 int i, x;
 410
 411                 if (channel_node != 0)
 412                         pmac_call_feature(
 413                                 PMAC_FTR_SCC_ENABLE,
 414                                 channel_node,
 415                                 PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
 416                         printk(KERN_INFO "Serial port locked ON by debugger !\n");
 417                 if (via_modem && channel_node != 0) {
 418                         unsigned int t0;
 419
 420                         pmac_call_feature(
 421                                 PMAC_FTR_MODEM_ENABLE,
 422                                 channel_node, 0, 1);
 423                         printk(KERN_INFO "Modem powered up by debugger !\n");
 424                         t0 = readtb();
 425                         while (readtb() - t0 < 3*TB_SPEED)
 426                                 eieio();
 427                 }
 428                 /* use the B channel if requested */
 429                 if (xmon_use_sccb) {
 430                         sccc = (volatile unsigned char *)
 431                                 ((unsigned long)sccc & ~0x20);
 432                         sccd = sccc + 0x10;
 433                 }
 434                 for (i = 20000; i != 0; --i) {
 435                         x = *sccc; eieio();
 436                 }
 437                 *sccc = 9; eieio();             /* reset A or B side */
 438                 *sccc = ((unsigned long)sccc & 0x20)? 0x80: 0x40; eieio();
 439                 for (i = 0; i < sizeof(scc_inittab); ++i) {
 440                         *sccc = scc_inittab[i];
 441                         eieio();
 442                 }
 443         }
 444         scc_initialized = 1;
 445         if (via_modem) {
 446                 for (;;) {
 447                         xmon_write(NULL, "ATE1V1\r", 7);
 448                         if (xmon_expect("OK", 5)) {
 449                                 xmon_write(NULL, "ATA\r", 4);
 450                                 if (xmon_expect("CONNECT", 40))
 451                                         break;
 452                         }
 453                         xmon_write(NULL, "+++", 3);
 454                         xmon_expect("OK", 3);
 455                 }
 456         }
 457 }
 458
 459 #if 0
 460 extern int (*prom_entry)(void *);
 461
 462 int
 463 xmon_exit(void)
 464 {
 465     struct prom_args {
 466         char *service;
 467     } args;
 468
 469     for (;;) {
 470         args.service = "exit";
 471         (*prom_entry)(&args);
 472     }
 473 }
 474 #endif
 475
 476 void *xmon_stdin;
 477 void *xmon_stdout;
 478 void *xmon_stderr;
 479
 480 void
 481 xmon_init(void)
 482 {
 483 }
 484
 485 int
 486 xmon_putc(int c, void *f)
 487 {
 488     char ch = c;
 489
 490     if (c == '\n')
 491         xmon_putc('\r', f);
 492     return xmon_write(f, &ch, 1) == 1? c: -1;
 493 }
 494
 495 int
 496 xmon_putchar(int c)
 497 {
 498     return xmon_putc(c, xmon_stdout);
 499 }
 500
 501 int
 502 xmon_fputs(char *str, void *f)
 503 {
 504     int n = strlen(str);
 505
 506     return xmon_write(f, str, n) == n? 0: -1;
 507 }
 508
 509 int
 510 xmon_readchar(void)
 511 {
 512     char ch;
 513
 514     for (;;) {
 515         switch (xmon_read(xmon_stdin, &ch, 1)) {
 516         case 1:
 517             return ch;
 518         case -1:
 519             xmon_printf("read(stdin) returned -1\r\n", 0, 0);
 520             return -1;
 521         }
 522     }
 523 }
 524
 525 static char line[256];
 526 static char *lineptr;
 527 static int lineleft;
 528
 529 int xmon_expect(const char *str, unsigned int timeout)
 530 {
 531         int c;
 532         unsigned int t0;
 533
 534         timeout *= TB_SPEED;
 535         t0 = readtb();
 536         do {
 537                 lineptr = line;
 538                 for (;;) {
 539                         c = xmon_read_poll();
 540                         if (c == -1) {
 541                                 if (readtb() - t0 > timeout)
 542                                         return 0;
 543                                 continue;
 544                         }
 545                         if (c == '\n')
 546                                 break;
 547                         if (c != '\r' && lineptr < &line[sizeof(line) - 1])
 548                                 *lineptr++ = c;
 549                 }
 550                 *lineptr = 0;
 551         } while (strstr(line, str) == NULL);
 552         return 1;
 553 }
 554
 555 int
 556 xmon_getchar(void)
 557 {
 558     int c;
 559
 560     if (lineleft == 0) {
 561         lineptr = line;
 562         for (;;) {
 563             c = xmon_readchar();
 564             if (c == -1 || c == 4)
 565                 break;
 566             if (c == '\r' || c == '\n') {
 567                 *lineptr++ = '\n';
 568                 xmon_putchar('\n');
 569                 break;
 570             }
 571             switch (c) {
 572             case 0177:
 573             case '\b':
 574                 if (lineptr > line) {
 575                     xmon_putchar('\b');
 576                     xmon_putchar(' ');
 577                     xmon_putchar('\b');
 578                     --lineptr;
 579                 }
 580                 break;
 581             case 'U' & 0x1F:
 582                 while (lineptr > line) {
 583                     xmon_putchar('\b');
 584                     xmon_putchar(' ');
 585                     xmon_putchar('\b');
 586                     --lineptr;
 587                 }
 588                 break;
 589             default:
 590                 if (lineptr >= &line[sizeof(line) - 1])
 591                     xmon_putchar('\a');
 592                 else {
 593                     xmon_putchar(c);
 594                     *lineptr++ = c;
 595                 }
 596             }
 597         }
 598         lineleft = lineptr - line;
 599         lineptr = line;
 600     }
 601     if (lineleft == 0)
 602         return -1;
 603     --lineleft;
 604     return *lineptr++;
 605 }
 606
 607 char *
 608 xmon_fgets(char *str, int nb, void *f)
 609 {
 610     char *p;
 611     int c;
 612
 613     for (p = str; p < str + nb - 1; ) {
 614         c = xmon_getchar();
 615         if (c == -1) {
 616             if (p == str)
 617                 return NULL;
 618             break;
 619         }
 620         *p++ = c;
 621         if (c == '\n')
 622             break;
 623     }
 624     *p = 0;
 625     return str;
 626 }
 627
 628 void
 629 xmon_enter(void)
 630 {
 631 #ifdef CONFIG_ADB_PMU
 632         if (_machine == _MACH_Pmac) {
 633                 pmu_suspend();
 634         }
 635 #endif
 636 }
 637
 638 void
 639 xmon_leave(void)
 640 {
 641 #ifdef CONFIG_ADB_PMU
 642         if (_machine == _MACH_Pmac) {
 643                 pmu_resume();
 644         }
 645 #endif
 646 }