arch/sh/kernel/setup.c

   1 /* $Id: setup.c,v 1.30 2003/10/13 07:21:19 lethal Exp $
   2  *
   3  *  linux/arch/sh/kernel/setup.c
   4  *
   5  *  Copyright (C) 1999  Niibe Yutaka
   6  *  Copyright (C) 2002, 2003  Paul Mundt
   7  */
   8
   9 /*
  10  * This file handles the architecture-dependent parts of initialization
  11  */
  12
  13 #include <linux/screen_info.h>
  14 #include <linux/ioport.h>
  15 #include <linux/init.h>
  16 #include <linux/initrd.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/console.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/root_dev.h>
  21 #include <linux/utsname.h>
  22 #include <linux/cpu.h>
  23 #include <linux/pfn.h>
  24 #include <linux/vs_cvirt.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/io.h>
  27 #include <asm/sections.h>
  28 #include <asm/irq.h>
  29 #include <asm/setup.h>
  30 #include <asm/clock.h>
  31
  32 #ifdef CONFIG_SH_KGDB
  33 #include <asm/kgdb.h>
  34 static int kgdb_parse_options(char *options);
  35 #endif
  36 extern void * __rd_start, * __rd_end;
  37 /*
  38  * Machine setup..
  39  */
  40
  41 /*
  42  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  43  * This value will be used at the very early stage of serial setup.
  44  * The bigger value means no problem.
  45  */
  46 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  47 struct screen_info screen_info;
  48
  49 #if defined(CONFIG_SH_UNKNOWN)
  50 struct sh_machine_vector sh_mv;
  51 #endif
  52
  53 /* We need this to satisfy some external references. */
  54 struct screen_info screen_info = {
  55         0, 25,                  /* orig-x, orig-y */
  56         0,                      /* unused */
  57         0,                      /* orig-video-page */
  58         0,                      /* orig-video-mode */
  59         80,                     /* orig-video-cols */
  60         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  61         25,                     /* orig-video-lines */
  62         0,                      /* orig-video-isVGA */
  63         16                      /* orig-video-points */
  64 };
  65
  66 extern void platform_setup(void);
  67 extern char *get_system_type(void);
  68 extern int root_mountflags;
  69
  70 #define MV_NAME_SIZE 32
  71
  72 static struct sh_machine_vector* __init get_mv_byname(const char* name);
  73
  74 /*
  75  * This is set up by the setup-routine at boot-time
  76  */
  77 #define PARAM   ((unsigned char *)empty_zero_page)
  78
  79 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  80 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  81 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  82 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  83 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  84 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  85 /* ... */
  86 #define COMMAND_LINE ((char *) (PARAM+0x100))
  87
  88 #define RAMDISK_IMAGE_START_MASK        0x07FF
  89 #define RAMDISK_PROMPT_FLAG             0x8000
  90 #define RAMDISK_LOAD_FLAG               0x4000
  91
  92 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  93
  94 struct resource standard_io_resources[] = {
  95         { "dma1", 0x00, 0x1f },
  96         { "pic1", 0x20, 0x3f },
  97         { "timer", 0x40, 0x5f },
  98         { "keyboard", 0x60, 0x6f },
  99         { "dma page reg", 0x80, 0x8f },
 100         { "pic2", 0xa0, 0xbf },
 101         { "dma2", 0xc0, 0xdf },
 102         { "fpu", 0xf0, 0xff }
 103 };
 104
 105 #define STANDARD_IO_RESOURCES (sizeof(standard_io_resources)/sizeof(struct resource))
 106
 107 /* System RAM - interrupted by the 640kB-1M hole */
 108 #define code_resource (ram_resources[3])
 109 #define data_resource (ram_resources[4])
 110 static struct resource ram_resources[] = {
 111         { "System RAM", 0x000000, 0x09ffff, IORESOURCE_BUSY },
 112         { "System RAM", 0x100000, 0x100000, IORESOURCE_BUSY },
 113         { "Video RAM area", 0x0a0000, 0x0bffff },
 114         { "Kernel code", 0x100000, 0 },
 115         { "Kernel data", 0, 0 }
 116 };
 117
 118 unsigned long memory_start, memory_end;
 119
 120 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
 121                                   struct sh_machine_vector** mvp,
 122                                   unsigned long *mv_io_base,
 123                                   int *mv_mmio_enable)
 124 {
 125         char c = ' ', *to = command_line, *from = COMMAND_LINE;
 126         int len = 0;
 127
 128         /* Save unparsed command line copy for /proc/cmdline */
 129         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 130         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 131
 132         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 133         memory_end = memory_start + __MEMORY_SIZE;
 134
 135         for (;;) {
 136                 /*
 137                  * "mem=XXX[kKmM]" defines a size of memory.
 138                  */
 139                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 140                         if (to != command_line)
 141                                 to--;
 142                         {
 143                                 unsigned long mem_size;
 144
 145                                 mem_size = memparse(from+4, &from);
 146                                 memory_end = memory_start + mem_size;
 147                         }
 148                 }
 149                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 150                         char* mv_end;
 151                         char* mv_comma;
 152                         int mv_len;
 153                         if (to != command_line)
 154                                 to--;
 155                         from += 6;
 156                         mv_end = strchr(from, ' ');
 157                         if (mv_end == NULL)
 158                                 mv_end = from + strlen(from);
 159
 160                         mv_comma = strchr(from, ',');
 161                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 162                                 int ints[3];
 163                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 164                                 *mv_io_base = ints[1];
 165                                 *mv_mmio_enable = ints[2];
 166                                 mv_len = mv_comma - from;
 167                         } else {
 168                                 mv_len = mv_end - from;
 169                         }
 170                         if (mv_len > (MV_NAME_SIZE-1))
 171                                 mv_len = MV_NAME_SIZE-1;
 172                         memcpy(mv_name, from, mv_len);
 173                         mv_name[mv_len] = '\0';
 174                         from = mv_end;
 175
 176                         *mvp = get_mv_byname(mv_name);
 177                 }
 178                 c = *(from++);
 179                 if (!c)
 180                         break;
 181                 if (COMMAND_LINE_SIZE <= ++len)
 182                         break;
 183                 *(to++) = c;
 184         }
 185         *to = '\0';
 186         *cmdline_p = command_line;
 187 }
 188
 189 static int __init sh_mv_setup(char **cmdline_p)
 190 {
 191 #ifdef CONFIG_SH_UNKNOWN
 192         extern struct sh_machine_vector mv_unknown;
 193 #endif
 194         struct sh_machine_vector *mv = NULL;
 195         char mv_name[MV_NAME_SIZE] = "";
 196         unsigned long mv_io_base = 0;
 197         int mv_mmio_enable = 0;
 198
 199         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);
 200
 201 #ifdef CONFIG_SH_UNKNOWN
 202         if (mv == NULL) {
 203                 mv = &mv_unknown;
 204                 if (*mv_name != '\0') {
 205                         printk("Warning: Unsupported machine %s, using unknown\n",
 206                                mv_name);
 207                 }
 208         }
 209         sh_mv = *mv;
 210 #endif
 211
 212         /*
 213          * Manually walk the vec, fill in anything that the board hasn't yet
 214          * by hand, wrapping to the generic implementation.
 215          */
 216 #define mv_set(elem) do { \
 217         if (!sh_mv.mv_##elem) \
 218                 sh_mv.mv_##elem = generic_##elem; \
 219 } while (0)
 220
 221         mv_set(inb);    mv_set(inw);    mv_set(inl);
 222         mv_set(outb);   mv_set(outw);   mv_set(outl);
 223
 224         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 225         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 226
 227         mv_set(insb);   mv_set(insw);   mv_set(insl);
 228         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 229
 230         mv_set(readb);  mv_set(readw);  mv_set(readl);
 231         mv_set(writeb); mv_set(writew); mv_set(writel);
 232
 233         mv_set(ioport_map);
 234         mv_set(ioport_unmap);
 235         mv_set(irq_demux);
 236
 237 #ifdef CONFIG_SH_UNKNOWN
 238         __set_io_port_base(mv_io_base);
 239 #endif
 240
 241         return 0;
 242 }
 243
 244 void __init setup_arch(char **cmdline_p)
 245 {
 246         unsigned long bootmap_size;
 247         unsigned long start_pfn, max_pfn, max_low_pfn;
 248
 249 #ifdef CONFIG_EARLY_PRINTK
 250         extern void enable_early_printk(void);
 251
 252         enable_early_printk();
 253 #endif
 254 #ifdef CONFIG_CMDLINE_BOOL
 255         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 256 #endif
 257
 258         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 259
 260 #ifdef CONFIG_BLK_DEV_RAM
 261         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 262         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 263         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 264 #endif
 265
 266         if (!MOUNT_ROOT_RDONLY)
 267                 root_mountflags &= ~MS_RDONLY;
 268         init_mm.start_code = (unsigned long) _text;
 269         init_mm.end_code = (unsigned long) _etext;
 270         init_mm.end_data = (unsigned long) _edata;
 271         init_mm.brk = (unsigned long) _end;
 272
 273         code_resource.start = (unsigned long)virt_to_phys(_text);
 274         code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
 275         data_resource.start = (unsigned long)virt_to_phys(_etext);
 276         data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
 277
 278         sh_mv_setup(cmdline_p);
 279
 280         /*
 281          * Find the highest page frame number we have available
 282          */
 283         max_pfn = PFN_DOWN(__pa(memory_end));
 284
 285         /*
 286          * Determine low and high memory ranges:
 287          */
 288         max_low_pfn = max_pfn;
 289
 290         /*
 291          * Partially used pages are not usable - thus
 292          * we are rounding upwards:
 293          */
 294         start_pfn = PFN_UP(__pa(_end));
 295
 296         /*
 297          * Find a proper area for the bootmem bitmap. After this
 298          * bootstrap step all allocations (until the page allocator
 299          * is intact) must be done via bootmem_alloc().
 300          */
 301         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 302                                          __MEMORY_START>>PAGE_SHIFT,
 303                                          max_low_pfn);
 304         /*
 305          * Register fully available low RAM pages with the bootmem allocator.
 306          */
 307         {
 308                 unsigned long curr_pfn, last_pfn, pages;
 309
 310                 /*
 311                  * We are rounding up the start address of usable memory:
 312                  */
 313                 curr_pfn = PFN_UP(__MEMORY_START);
 314                 /*
 315                  * ... and at the end of the usable range downwards:
 316                  */
 317                 last_pfn = PFN_DOWN(__pa(memory_end));
 318
 319                 if (last_pfn > max_low_pfn)
 320                         last_pfn = max_low_pfn;
 321
 322                 pages = last_pfn - curr_pfn;
 323                 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
 324                                   PFN_PHYS(pages));
 325         }
 326
 327         /*
 328          * Reserve the kernel text and
 329          * Reserve the bootmem bitmap. We do this in two steps (first step
 330          * was init_bootmem()), because this catches the (definitely buggy)
 331          * case of us accidentally initializing the bootmem allocator with
 332          * an invalid RAM area.
 333          */
 334         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
 335                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 336
 337         /*
 338          * reserve physical page 0 - it's a special BIOS page on many boxes,
 339          * enabling clean reboots, SMP operation, laptop functions.
 340          */
 341         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
 342
 343 #ifdef CONFIG_BLK_DEV_INITRD
 344         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 345         if (&__rd_start != &__rd_end) {
 346                 LOADER_TYPE = 1;
 347                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
 348                 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
 349         }
 350
 351         if (LOADER_TYPE && INITRD_START) {
 352                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 353                         reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
 354                         initrd_start =
 355                                 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
 356                         initrd_end = initrd_start + INITRD_SIZE;
 357                 } else {
 358                         printk("initrd extends beyond end of memory "
 359                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 360                                     INITRD_START + INITRD_SIZE,
 361                                     max_low_pfn << PAGE_SHIFT);
 362                         initrd_start = 0;
 363                 }
 364         }
 365 #endif
 366
 367 #ifdef CONFIG_DUMMY_CONSOLE
 368         conswitchp = &dummy_con;
 369 #endif
 370
 371         /* Perform the machine specific initialisation */
 372         platform_setup();
 373
 374         paging_init();
 375 }
 376
 377 struct sh_machine_vector* __init get_mv_byname(const char* name)
 378 {
 379         extern int strcasecmp(const char *, const char *);
 380         extern long __machvec_start, __machvec_end;
 381         struct sh_machine_vector *all_vecs =
 382                 (struct sh_machine_vector *)&__machvec_start;
 383
 384         int i, n = ((unsigned long)&__machvec_end
 385                     - (unsigned long)&__machvec_start)/
 386                 sizeof(struct sh_machine_vector);
 387
 388         for (i = 0; i < n; ++i) {
 389                 struct sh_machine_vector *mv = &all_vecs[i];
 390                 if (mv == NULL)
 391                         continue;
 392                 if (strcasecmp(name, get_system_type()) == 0) {
 393                         return mv;
 394                 }
 395         }
 396         return NULL;
 397 }
 398
 399 static struct cpu cpu[NR_CPUS];
 400
 401 static int __init topology_init(void)
 402 {
 403         int cpu_id;
 404
 405         for_each_possible_cpu(cpu_id)
 406                 register_cpu(&cpu[cpu_id], cpu_id);
 407
 408         return 0;
 409 }
 410
 411 subsys_initcall(topology_init);
 412
 413 static const char *cpu_name[] = {
 414         [CPU_SH7604]    = "SH7604",
 415         [CPU_SH7705]    = "SH7705",
 416         [CPU_SH7708]    = "SH7708",
 417         [CPU_SH7729]    = "SH7729",
 418         [CPU_SH7300]    = "SH7300",
 419         [CPU_SH7750]    = "SH7750",
 420         [CPU_SH7750S]   = "SH7750S",
 421         [CPU_SH7750R]   = "SH7750R",
 422         [CPU_SH7751]    = "SH7751",
 423         [CPU_SH7751R]   = "SH7751R",
 424         [CPU_SH7760]    = "SH7760",
 425         [CPU_SH73180]   = "SH73180",
 426         [CPU_ST40RA]    = "ST40RA",
 427         [CPU_ST40GX1]   = "ST40GX1",
 428         [CPU_SH4_202]   = "SH4-202",
 429         [CPU_SH4_501]   = "SH4-501",
 430         [CPU_SH7770]    = "SH7770",
 431         [CPU_SH7780]    = "SH7780",
 432         [CPU_SH7781]    = "SH7781",
 433         [CPU_SH_NONE]   = "Unknown"
 434 };
 435
 436 const char *get_cpu_subtype(void)
 437 {
 438         return cpu_name[boot_cpu_data.type];
 439 }
 440
 441 #ifdef CONFIG_PROC_FS
 442 static const char *cpu_flags[] = {
 443         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", "ptea", NULL
 444 };
 445
 446 static void show_cpuflags(struct seq_file *m)
 447 {
 448         unsigned long i;
 449
 450         seq_printf(m, "cpu flags\t:");
 451
 452         if (!cpu_data->flags) {
 453                 seq_printf(m, " %s\n", cpu_flags[0]);
 454                 return;
 455         }
 456
 457         for (i = 0; cpu_flags[i]; i++)
 458                 if ((cpu_data->flags & (1 << i)))
 459                         seq_printf(m, " %s", cpu_flags[i+1]);
 460
 461         seq_printf(m, "\n");
 462 }
 463
 464 static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info)
 465 {
 466         unsigned int cache_size;
 467
 468         cache_size = info.ways * info.sets * info.linesz;
 469
 470         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 471                    type, cache_size >> 10, info.ways);
 472 }
 473
 474 /*
 475  *      Get CPU information for use by the procfs.
 476  */
 477 static int show_cpuinfo(struct seq_file *m, void *v)
 478 {
 479         unsigned int cpu = smp_processor_id();
 480
 481         if (!cpu && cpu_online(cpu))
 482                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 483
 484         seq_printf(m, "processor\t: %d\n", cpu);
 485         seq_printf(m, "cpu family\t: %s\n", vx_new_uts(machine));
 486         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
 487
 488         show_cpuflags(m);
 489
 490         seq_printf(m, "cache type\t: ");
 491
 492         /*
 493          * Check for what type of cache we have, we support both the
 494          * unified cache on the SH-2 and SH-3, as well as the harvard
 495          * style cache on the SH-4.
 496          */
 497         if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) {
 498                 seq_printf(m, "unified\n");
 499                 show_cacheinfo(m, "cache", boot_cpu_data.icache);
 500         } else {
 501                 seq_printf(m, "split (harvard)\n");
 502                 show_cacheinfo(m, "icache", boot_cpu_data.icache);
 503                 show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
 504         }
 505
 506         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 507                      boot_cpu_data.loops_per_jiffy/(500000/HZ),
 508                      (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);
 509
 510         return show_clocks(m);
 511 }
 512
 513 static void *c_start(struct seq_file *m, loff_t *pos)
 514 {
 515         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 516 }
 517 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 518 {
 519         ++*pos;
 520         return c_start(m, pos);
 521 }
 522 static void c_stop(struct seq_file *m, void *v)
 523 {
 524 }
 525 struct seq_operations cpuinfo_op = {
 526         .start  = c_start,
 527         .next   = c_next,
 528         .stop   = c_stop,
 529         .show   = show_cpuinfo,
 530 };
 531 #endif /* CONFIG_PROC_FS */
 532
 533 #ifdef CONFIG_SH_KGDB
 534 /*
 535  * Parse command-line kgdb options.  By default KGDB is enabled,
 536  * entered on error (or other action) using default serial info.
 537  * The command-line option can include a serial port specification
 538  * and an action to override default or configured behavior.
 539  */
 540 struct kgdb_sermap kgdb_sci_sermap =
 541 { "ttySC", 5, kgdb_sci_setup, NULL };
 542
 543 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
 544 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
 545
 546 void kgdb_register_sermap(struct kgdb_sermap *map)
 547 {
 548         struct kgdb_sermap *last;
 549
 550         for (last = kgdb_serlist; last->next; last = last->next)
 551                 ;
 552         last->next = map;
 553         if (!map->namelen) {
 554                 map->namelen = strlen(map->name);
 555         }
 556 }
 557
 558 static int __init kgdb_parse_options(char *options)
 559 {
 560         char c;
 561         int baud;
 562
 563         /* Check for port spec (or use default) */
 564
 565         /* Determine port type and instance */
 566         if (!memcmp(options, "tty", 3)) {
 567                 struct kgdb_sermap *map = kgdb_serlist;
 568
 569                 while (map && memcmp(options, map->name, map->namelen))
 570                         map = map->next;
 571
 572                 if (!map) {
 573                         KGDB_PRINTK("unknown port spec in %s\n", options);
 574                         return -1;
 575                 }
 576
 577                 kgdb_porttype = map;
 578                 kgdb_serial_setup = map->setup_fn;
 579                 kgdb_portnum = options[map->namelen] - '0';
 580                 options += map->namelen + 1;
 581
 582                 options = (*options == ',') ? options+1 : options;
 583
 584                 /* Read optional parameters (baud/parity/bits) */
 585                 baud = simple_strtoul(options, &options, 10);
 586                 if (baud != 0) {
 587                         kgdb_baud = baud;
 588
 589                         c = toupper(*options);
 590                         if (c == 'E' || c == 'O' || c == 'N') {
 591                                 kgdb_parity = c;
 592                                 options++;
 593                         }
 594
 595                         c = *options;
 596                         if (c == '7' || c == '8') {
 597                                 kgdb_bits = c;
 598                                 options++;
 599                         }
 600                         options = (*options == ',') ? options+1 : options;
 601                 }
 602         }
 603
 604         /* Check for action specification */
 605         if (!memcmp(options, "halt", 4)) {
 606                 kgdb_halt = 1;
 607                 options += 4;
 608         } else if (!memcmp(options, "disabled", 8)) {
 609                 kgdb_enabled = 0;
 610                 options += 8;
 611         }
 612
 613         if (*options) {
 614                 KGDB_PRINTK("ignored unknown options: %s\n", options);
 615                 return 0;
 616         }
 617         return 1;
 618 }
 619 __setup("kgdb=", kgdb_parse_options);
 620 #endif /* CONFIG_SH_KGDB */
 621