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 #ifdef CONFIG_MAGIC_SYSRQ
 219         __sysrq_put_key_op('x', &sysrq_xmon_op);
 220 #endif
 221 }
 222
 223 static int scc_initialized = 0;
 224
 225 void xmon_init_scc(void);
 226 extern void cuda_poll(void);
 227
 228 static inline void do_poll_adb(void)
 229 {
 230 #ifdef CONFIG_ADB_PMU
 231         if (sys_ctrler == SYS_CTRLER_PMU)
 232                 pmu_poll_adb();
 233 #endif /* CONFIG_ADB_PMU */
 234 #ifdef CONFIG_ADB_CUDA
 235         if (sys_ctrler == SYS_CTRLER_CUDA)
 236                 cuda_poll();
 237 #endif /* CONFIG_ADB_CUDA */
 238 }
 239
 240 int
 241 xmon_write(void *handle, void *ptr, int nb)
 242 {
 243         char *p = ptr;
 244         int i, c, ct;
 245
 246 #ifdef CONFIG_SMP
 247         static unsigned long xmon_write_lock;
 248         int lock_wait = 1000000;
 249         int locked;
 250
 251         while ((locked = test_and_set_bit(0, &xmon_write_lock)) != 0)
 252                 if (--lock_wait == 0)
 253                         break;
 254 #endif
 255
 256 #ifdef CONFIG_BOOTX_TEXT
 257         if (use_screen) {
 258                 /* write it on the screen */
 259                 for (i = 0; i < nb; ++i)
 260                         btext_drawchar(*p++);
 261                 goto out;
 262         }
 263 #endif
 264         if (!scc_initialized)
 265                 xmon_init_scc();
 266         ct = 0;
 267         for (i = 0; i < nb; ++i) {
 268                 while ((*sccc & TXRDY) == 0)
 269                         do_poll_adb();
 270                 c = p[i];
 271                 if (c == '\n' && !ct) {
 272                         c = '\r';
 273                         ct = 1;
 274                         --i;
 275                 } else {
 276                         ct = 0;
 277                 }
 278                 buf_access();
 279                 *sccd = c;
 280                 eieio();
 281         }
 282
 283  out:
 284 #ifdef CONFIG_SMP
 285         if (!locked)
 286                 clear_bit(0, &xmon_write_lock);
 287 #endif
 288         return nb;
 289 }
 290
 291 int xmon_wants_key;
 292 int xmon_adb_keycode;
 293
 294 #ifdef CONFIG_BOOTX_TEXT
 295 static int xmon_adb_shiftstate;
 296
 297 static unsigned char xmon_keytab[128] =
 298         "asdfhgzxcv\000bqwer"                           /* 0x00 - 0x0f */
 299         "yt123465=97-80]o"                              /* 0x10 - 0x1f */
 300         "u[ip\rlj'k;\\,/nm."                            /* 0x20 - 0x2f */
 301         "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0"            /* 0x30 - 0x3f */
 302         "\0.\0*\0+\0\0\0\0\0/\r\0-\0"                   /* 0x40 - 0x4f */
 303         "\0\0000123456789\0\0\0";                       /* 0x50 - 0x5f */
 304
 305 static unsigned char xmon_shift_keytab[128] =
 306         "ASDFHGZXCV\000BQWER"                           /* 0x00 - 0x0f */
 307         "YT!@#$^%+(&_*)}O"                              /* 0x10 - 0x1f */
 308         "U{IP\rLJ\"K:|<?NM>"                            /* 0x20 - 0x2f */
 309         "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0"            /* 0x30 - 0x3f */
 310         "\0.\0*\0+\0\0\0\0\0/\r\0-\0"                   /* 0x40 - 0x4f */
 311         "\0\0000123456789\0\0\0";                       /* 0x50 - 0x5f */
 312
 313 static int
 314 xmon_get_adb_key(void)
 315 {
 316         int k, t, on;
 317
 318         xmon_wants_key = 1;
 319         for (;;) {
 320                 xmon_adb_keycode = -1;
 321                 t = 0;
 322                 on = 0;
 323                 do {
 324                         if (--t < 0) {
 325                                 on = 1 - on;
 326                                 btext_drawchar(on? 0xdb: 0x20);
 327                                 btext_drawchar('\b');
 328                                 t = 200000;
 329                         }
 330                         do_poll_adb();
 331                 } while (xmon_adb_keycode == -1);
 332                 k = xmon_adb_keycode;
 333                 if (on)
 334                         btext_drawstring(" \b");
 335
 336                 /* test for shift keys */
 337                 if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
 338                         xmon_adb_shiftstate = (k & 0x80) == 0;
 339                         continue;
 340                 }
 341                 if (k >= 0x80)
 342                         continue;       /* ignore up transitions */
 343                 k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
 344                 if (k != 0)
 345                         break;
 346         }
 347         xmon_wants_key = 0;
 348         return k;
 349 }
 350 #endif /* CONFIG_BOOTX_TEXT */
 351
 352 int
 353 xmon_read(void *handle, void *ptr, int nb)
 354 {
 355     char *p = ptr;
 356     int i;
 357
 358 #ifdef CONFIG_BOOTX_TEXT
 359     if (use_screen) {
 360         for (i = 0; i < nb; ++i)
 361             *p++ = xmon_get_adb_key();
 362         return i;
 363     }
 364 #endif
 365     if (!scc_initialized)
 366         xmon_init_scc();
 367     for (i = 0; i < nb; ++i) {
 368         while ((*sccc & RXRDY) == 0)
 369             do_poll_adb();
 370         buf_access();
 371         *p++ = *sccd;
 372     }
 373     return i;
 374 }
 375
 376 int
 377 xmon_read_poll(void)
 378 {
 379         if ((*sccc & RXRDY) == 0) {
 380                 do_poll_adb();
 381                 return -1;
 382         }
 383         buf_access();
 384         return *sccd;
 385 }
 386
 387 static unsigned char scc_inittab[] = {
 388     13, 0,              /* set baud rate divisor */
 389     12, 1,
 390     14, 1,              /* baud rate gen enable, src=rtxc */
 391     11, 0x50,           /* clocks = br gen */
 392     5,  0xea,           /* tx 8 bits, assert DTR & RTS */
 393     4,  0x46,           /* x16 clock, 1 stop */
 394     3,  0xc1,           /* rx enable, 8 bits */
 395 };
 396
 397 void
 398 xmon_init_scc(void)
 399 {
 400         if ( _machine == _MACH_chrp )
 401         {
 402                 sccd[3] = 0x83; eieio();        /* LCR = 8N1 + DLAB */
 403                 sccd[0] = 12; eieio();          /* DLL = 9600 baud */
 404                 sccd[1] = 0; eieio();
 405                 sccd[2] = 0; eieio();           /* FCR = 0 */
 406                 sccd[3] = 3; eieio();           /* LCR = 8N1 */
 407                 sccd[1] = 0; eieio();           /* IER = 0 */
 408         }
 409         else if ( _machine == _MACH_Pmac )
 410         {
 411                 int i, x;
 412
 413                 if (channel_node != 0)
 414                         pmac_call_feature(
 415                                 PMAC_FTR_SCC_ENABLE,
 416                                 channel_node,
 417                                 PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
 418                         printk(KERN_INFO "Serial port locked ON by debugger !\n");
 419                 if (via_modem && channel_node != 0) {
 420                         unsigned int t0;
 421
 422                         pmac_call_feature(
 423                                 PMAC_FTR_MODEM_ENABLE,
 424                                 channel_node, 0, 1);
 425                         printk(KERN_INFO "Modem powered up by debugger !\n");
 426                         t0 = readtb();
 427                         while (readtb() - t0 < 3*TB_SPEED)
 428                                 eieio();
 429                 }
 430                 /* use the B channel if requested */
 431                 if (xmon_use_sccb) {
 432                         sccc = (volatile unsigned char *)
 433                                 ((unsigned long)sccc & ~0x20);
 434                         sccd = sccc + 0x10;
 435                 }
 436                 for (i = 20000; i != 0; --i) {
 437                         x = *sccc; eieio();
 438                 }
 439                 *sccc = 9; eieio();             /* reset A or B side */
 440                 *sccc = ((unsigned long)sccc & 0x20)? 0x80: 0x40; eieio();
 441                 for (i = 0; i < sizeof(scc_inittab); ++i) {
 442                         *sccc = scc_inittab[i];
 443                         eieio();
 444                 }
 445         }
 446         scc_initialized = 1;
 447         if (via_modem) {
 448                 for (;;) {
 449                         xmon_write(NULL, "ATE1V1\r", 7);
 450                         if (xmon_expect("OK", 5)) {
 451                                 xmon_write(NULL, "ATA\r", 4);
 452                                 if (xmon_expect("CONNECT", 40))
 453                                         break;
 454                         }
 455                         xmon_write(NULL, "+++", 3);
 456                         xmon_expect("OK", 3);
 457                 }
 458         }
 459 }
 460
 461 #if 0
 462 extern int (*prom_entry)(void *);
 463
 464 int
 465 xmon_exit(void)
 466 {
 467     struct prom_args {
 468         char *service;
 469     } args;
 470
 471     for (;;) {
 472         args.service = "exit";
 473         (*prom_entry)(&args);
 474     }
 475 }
 476 #endif
 477
 478 void *xmon_stdin;
 479 void *xmon_stdout;
 480 void *xmon_stderr;
 481
 482 void
 483 xmon_init(void)
 484 {
 485 }
 486
 487 int
 488 xmon_putc(int c, void *f)
 489 {
 490     char ch = c;
 491
 492     if (c == '\n')
 493         xmon_putc('\r', f);
 494     return xmon_write(f, &ch, 1) == 1? c: -1;
 495 }
 496
 497 int
 498 xmon_putchar(int c)
 499 {
 500     return xmon_putc(c, xmon_stdout);
 501 }
 502
 503 int
 504 xmon_fputs(char *str, void *f)
 505 {
 506     int n = strlen(str);
 507
 508     return xmon_write(f, str, n) == n? 0: -1;
 509 }
 510
 511 int
 512 xmon_readchar(void)
 513 {
 514     char ch;
 515
 516     for (;;) {
 517         switch (xmon_read(xmon_stdin, &ch, 1)) {
 518         case 1:
 519             return ch;
 520         case -1:
 521             xmon_printf("read(stdin) returned -1\r\n", 0, 0);
 522             return -1;
 523         }
 524     }
 525 }
 526
 527 static char line[256];
 528 static char *lineptr;
 529 static int lineleft;
 530
 531 int xmon_expect(const char *str, unsigned int timeout)
 532 {
 533         int c;
 534         unsigned int t0;
 535
 536         timeout *= TB_SPEED;
 537         t0 = readtb();
 538         do {
 539                 lineptr = line;
 540                 for (;;) {
 541                         c = xmon_read_poll();
 542                         if (c == -1) {
 543                                 if (readtb() - t0 > timeout)
 544                                         return 0;
 545                                 continue;
 546                         }
 547                         if (c == '\n')
 548                                 break;
 549                         if (c != '\r' && lineptr < &line[sizeof(line) - 1])
 550                                 *lineptr++ = c;
 551                 }
 552                 *lineptr = 0;
 553         } while (strstr(line, str) == NULL);
 554         return 1;
 555 }
 556
 557 int
 558 xmon_getchar(void)
 559 {
 560     int c;
 561
 562     if (lineleft == 0) {
 563         lineptr = line;
 564         for (;;) {
 565             c = xmon_readchar();
 566             if (c == -1 || c == 4)
 567                 break;
 568             if (c == '\r' || c == '\n') {
 569                 *lineptr++ = '\n';
 570                 xmon_putchar('\n');
 571                 break;
 572             }
 573             switch (c) {
 574             case 0177:
 575             case '\b':
 576                 if (lineptr > line) {
 577                     xmon_putchar('\b');
 578                     xmon_putchar(' ');
 579                     xmon_putchar('\b');
 580                     --lineptr;
 581                 }
 582                 break;
 583             case 'U' & 0x1F:
 584                 while (lineptr > line) {
 585                     xmon_putchar('\b');
 586                     xmon_putchar(' ');
 587                     xmon_putchar('\b');
 588                     --lineptr;
 589                 }
 590                 break;
 591             default:
 592                 if (lineptr >= &line[sizeof(line) - 1])
 593                     xmon_putchar('\a');
 594                 else {
 595                     xmon_putchar(c);
 596                     *lineptr++ = c;
 597                 }
 598             }
 599         }
 600         lineleft = lineptr - line;
 601         lineptr = line;
 602     }
 603     if (lineleft == 0)
 604         return -1;
 605     --lineleft;
 606     return *lineptr++;
 607 }
 608
 609 char *
 610 xmon_fgets(char *str, int nb, void *f)
 611 {
 612     char *p;
 613     int c;
 614
 615     for (p = str; p < str + nb - 1; ) {
 616         c = xmon_getchar();
 617         if (c == -1) {
 618             if (p == str)
 619                 return NULL;
 620             break;
 621         }
 622         *p++ = c;
 623         if (c == '\n')
 624             break;
 625     }
 626     *p = 0;
 627     return str;
 628 }
 629
 630 void
 631 xmon_enter(void)
 632 {
 633 #ifdef CONFIG_ADB_PMU
 634         if (_machine == _MACH_Pmac) {
 635                 pmu_suspend();
 636         }
 637 #endif
 638 }
 639
 640 void
 641 xmon_leave(void)
 642 {
 643 #ifdef CONFIG_ADB_PMU
 644         if (_machine == _MACH_Pmac) {
 645                 pmu_resume();
 646         }
 647 #endif
 648 }