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/tty.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 <asm/uaccess.h>
  24 #include <asm/io.h>
  25 #include <asm/sections.h>
  26 #include <asm/irq.h>
  27 #include <asm/setup.h>
  28 #include <asm/clock.h>
  29
  30 #ifdef CONFIG_SH_KGDB
  31 #include <asm/kgdb.h>
  32 static int kgdb_parse_options(char *options);
  33 #endif
  34 extern void * __rd_start, * __rd_end;
  35 /*
  36  * Machine setup..
  37  */
  38
  39 /*
  40  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  41  * This value will be used at the very early stage of serial setup.
  42  * The bigger value means no problem.
  43  */
  44 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  45 struct screen_info screen_info;
  46
  47 #if defined(CONFIG_SH_UNKNOWN)
  48 struct sh_machine_vector sh_mv;
  49 #endif
  50
  51 /* We need this to satisfy some external references. */
  52 struct screen_info screen_info = {
  53         0, 25,                  /* orig-x, orig-y */
  54         0,                      /* unused */
  55         0,                      /* orig-video-page */
  56         0,                      /* orig-video-mode */
  57         80,                     /* orig-video-cols */
  58         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  59         25,                     /* orig-video-lines */
  60         0,                      /* orig-video-isVGA */
  61         16                      /* orig-video-points */
  62 };
  63
  64 extern void platform_setup(void);
  65 extern char *get_system_type(void);
  66 extern int root_mountflags;
  67
  68 #define MV_NAME_SIZE 32
  69
  70 static struct sh_machine_vector* __init get_mv_byname(const char* name);
  71
  72 /*
  73  * This is set up by the setup-routine at boot-time
  74  */
  75 #define PARAM   ((unsigned char *)empty_zero_page)
  76
  77 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  78 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  79 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  80 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  81 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  82 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  83 /* ... */
  84 #define COMMAND_LINE ((char *) (PARAM+0x100))
  85
  86 #define RAMDISK_IMAGE_START_MASK        0x07FF
  87 #define RAMDISK_PROMPT_FLAG             0x8000
  88 #define RAMDISK_LOAD_FLAG               0x4000
  89
  90 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  91
  92 struct resource standard_io_resources[] = {
  93         { "dma1", 0x00, 0x1f },
  94         { "pic1", 0x20, 0x3f },
  95         { "timer", 0x40, 0x5f },
  96         { "keyboard", 0x60, 0x6f },
  97         { "dma page reg", 0x80, 0x8f },
  98         { "pic2", 0xa0, 0xbf },
  99         { "dma2", 0xc0, 0xdf },
 100         { "fpu", 0xf0, 0xff }
 101 };
 102
 103 #define STANDARD_IO_RESOURCES (sizeof(standard_io_resources)/sizeof(struct resource))
 104
 105 /* System RAM - interrupted by the 640kB-1M hole */
 106 #define code_resource (ram_resources[3])
 107 #define data_resource (ram_resources[4])
 108 static struct resource ram_resources[] = {
 109         { "System RAM", 0x000000, 0x09ffff, IORESOURCE_BUSY },
 110         { "System RAM", 0x100000, 0x100000, IORESOURCE_BUSY },
 111         { "Video RAM area", 0x0a0000, 0x0bffff },
 112         { "Kernel code", 0x100000, 0 },
 113         { "Kernel data", 0, 0 }
 114 };
 115
 116 unsigned long memory_start, memory_end;
 117
 118 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
 119                                   struct sh_machine_vector** mvp,
 120                                   unsigned long *mv_io_base,
 121                                   int *mv_mmio_enable)
 122 {
 123         char c = ' ', *to = command_line, *from = COMMAND_LINE;
 124         int len = 0;
 125
 126         /* Save unparsed command line copy for /proc/cmdline */
 127         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 128         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 129
 130         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 131         memory_end = memory_start + __MEMORY_SIZE;
 132
 133         for (;;) {
 134                 /*
 135                  * "mem=XXX[kKmM]" defines a size of memory.
 136                  */
 137                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 138                         if (to != command_line)
 139                                 to--;
 140                         {
 141                                 unsigned long mem_size;
 142
 143                                 mem_size = memparse(from+4, &from);
 144                                 memory_end = memory_start + mem_size;
 145                         }
 146                 }
 147                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 148                         char* mv_end;
 149                         char* mv_comma;
 150                         int mv_len;
 151                         if (to != command_line)
 152                                 to--;
 153                         from += 6;
 154                         mv_end = strchr(from, ' ');
 155                         if (mv_end == NULL)
 156                                 mv_end = from + strlen(from);
 157
 158                         mv_comma = strchr(from, ',');
 159                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 160                                 int ints[3];
 161                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 162                                 *mv_io_base = ints[1];
 163                                 *mv_mmio_enable = ints[2];
 164                                 mv_len = mv_comma - from;
 165                         } else {
 166                                 mv_len = mv_end - from;
 167                         }
 168                         if (mv_len > (MV_NAME_SIZE-1))
 169                                 mv_len = MV_NAME_SIZE-1;
 170                         memcpy(mv_name, from, mv_len);
 171                         mv_name[mv_len] = '\0';
 172                         from = mv_end;
 173
 174                         *mvp = get_mv_byname(mv_name);
 175                 }
 176                 c = *(from++);
 177                 if (!c)
 178                         break;
 179                 if (COMMAND_LINE_SIZE <= ++len)
 180                         break;
 181                 *(to++) = c;
 182         }
 183         *to = '\0';
 184         *cmdline_p = command_line;
 185 }
 186
 187 static int __init sh_mv_setup(char **cmdline_p)
 188 {
 189 #ifdef CONFIG_SH_UNKNOWN
 190         extern struct sh_machine_vector mv_unknown;
 191 #endif
 192         struct sh_machine_vector *mv = NULL;
 193         char mv_name[MV_NAME_SIZE] = "";
 194         unsigned long mv_io_base = 0;
 195         int mv_mmio_enable = 0;
 196
 197         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);
 198
 199 #ifdef CONFIG_SH_UNKNOWN
 200         if (mv == NULL) {
 201                 mv = &mv_unknown;
 202                 if (*mv_name != '\0') {
 203                         printk("Warning: Unsupported machine %s, using unknown\n",
 204                                mv_name);
 205                 }
 206         }
 207         sh_mv = *mv;
 208 #endif
 209
 210         /*
 211          * Manually walk the vec, fill in anything that the board hasn't yet
 212          * by hand, wrapping to the generic implementation.
 213          */
 214 #define mv_set(elem) do { \
 215         if (!sh_mv.mv_##elem) \
 216                 sh_mv.mv_##elem = generic_##elem; \
 217 } while (0)
 218
 219         mv_set(inb);    mv_set(inw);    mv_set(inl);
 220         mv_set(outb);   mv_set(outw);   mv_set(outl);
 221
 222         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 223         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 224
 225         mv_set(insb);   mv_set(insw);   mv_set(insl);
 226         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 227
 228         mv_set(readb);  mv_set(readw);  mv_set(readl);
 229         mv_set(writeb); mv_set(writew); mv_set(writel);
 230
 231         mv_set(ioport_map);
 232         mv_set(ioport_unmap);
 233         mv_set(irq_demux);
 234
 235 #ifdef CONFIG_SH_UNKNOWN
 236         __set_io_port_base(mv_io_base);
 237 #endif
 238
 239         return 0;
 240 }
 241
 242 void __init setup_arch(char **cmdline_p)
 243 {
 244         unsigned long bootmap_size;
 245         unsigned long start_pfn, max_pfn, max_low_pfn;
 246
 247 #ifdef CONFIG_EARLY_PRINTK
 248         extern void enable_early_printk(void);
 249
 250         enable_early_printk();
 251 #endif
 252 #ifdef CONFIG_CMDLINE_BOOL
 253         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 254 #endif
 255
 256         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 257
 258 #ifdef CONFIG_BLK_DEV_RAM
 259         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 260         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 261         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 262 #endif
 263
 264         if (!MOUNT_ROOT_RDONLY)
 265                 root_mountflags &= ~MS_RDONLY;
 266         init_mm.start_code = (unsigned long) _text;
 267         init_mm.end_code = (unsigned long) _etext;
 268         init_mm.end_data = (unsigned long) _edata;
 269         init_mm.brk = (unsigned long) _end;
 270
 271         code_resource.start = (unsigned long)virt_to_phys(_text);
 272         code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
 273         data_resource.start = (unsigned long)virt_to_phys(_etext);
 274         data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
 275
 276         sh_mv_setup(cmdline_p);
 277
 278 #define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 279 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 280 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 281
 282         /*
 283          * Find the highest page frame number we have available
 284          */
 285         max_pfn = PFN_DOWN(__pa(memory_end));
 286
 287         /*
 288          * Determine low and high memory ranges:
 289          */
 290         max_low_pfn = max_pfn;
 291
 292         /*
 293          * Partially used pages are not usable - thus
 294          * we are rounding upwards:
 295          */
 296         start_pfn = PFN_UP(__pa(_end));
 297
 298         /*
 299          * Find a proper area for the bootmem bitmap. After this
 300          * bootstrap step all allocations (until the page allocator
 301          * is intact) must be done via bootmem_alloc().
 302          */
 303         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 304                                          __MEMORY_START>>PAGE_SHIFT,
 305                                          max_low_pfn);
 306         /*
 307          * Register fully available low RAM pages with the bootmem allocator.
 308          */
 309         {
 310                 unsigned long curr_pfn, last_pfn, pages;
 311
 312                 /*
 313                  * We are rounding up the start address of usable memory:
 314                  */
 315                 curr_pfn = PFN_UP(__MEMORY_START);
 316                 /*
 317                  * ... and at the end of the usable range downwards:
 318                  */
 319                 last_pfn = PFN_DOWN(__pa(memory_end));
 320
 321                 if (last_pfn > max_low_pfn)
 322                         last_pfn = max_low_pfn;
 323
 324                 pages = last_pfn - curr_pfn;
 325                 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
 326                                   PFN_PHYS(pages));
 327         }
 328
 329         /*
 330          * Reserve the kernel text and
 331          * Reserve the bootmem bitmap. We do this in two steps (first step
 332          * was init_bootmem()), because this catches the (definitely buggy)
 333          * case of us accidentally initializing the bootmem allocator with
 334          * an invalid RAM area.
 335          */
 336         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
 337                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 338
 339         /*
 340          * reserve physical page 0 - it's a special BIOS page on many boxes,
 341          * enabling clean reboots, SMP operation, laptop functions.
 342          */
 343         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
 344
 345 #ifdef CONFIG_BLK_DEV_INITRD
 346         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 347         if (&__rd_start != &__rd_end) {
 348                 LOADER_TYPE = 1;
 349                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
 350                 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
 351         }
 352
 353         if (LOADER_TYPE && INITRD_START) {
 354                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 355                         reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
 356                         initrd_start =
 357                                 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
 358                         initrd_end = initrd_start + INITRD_SIZE;
 359                 } else {
 360                         printk("initrd extends beyond end of memory "
 361                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 362                                     INITRD_START + INITRD_SIZE,
 363                                     max_low_pfn << PAGE_SHIFT);
 364                         initrd_start = 0;
 365                 }
 366         }
 367 #endif
 368
 369 #ifdef CONFIG_DUMMY_CONSOLE
 370         conswitchp = &dummy_con;
 371 #endif
 372
 373         /* Perform the machine specific initialisation */
 374         platform_setup();
 375
 376         paging_init();
 377 }
 378
 379 struct sh_machine_vector* __init get_mv_byname(const char* name)
 380 {
 381         extern int strcasecmp(const char *, const char *);
 382         extern long __machvec_start, __machvec_end;
 383         struct sh_machine_vector *all_vecs =
 384                 (struct sh_machine_vector *)&__machvec_start;
 385
 386         int i, n = ((unsigned long)&__machvec_end
 387                     - (unsigned long)&__machvec_start)/
 388                 sizeof(struct sh_machine_vector);
 389
 390         for (i = 0; i < n; ++i) {
 391                 struct sh_machine_vector *mv = &all_vecs[i];
 392                 if (mv == NULL)
 393                         continue;
 394                 if (strcasecmp(name, get_system_type()) == 0) {
 395                         return mv;
 396                 }
 397         }
 398         return NULL;
 399 }
 400
 401 static struct cpu cpu[NR_CPUS];
 402
 403 static int __init topology_init(void)
 404 {
 405         int cpu_id;
 406
 407         for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++)
 408                 if (cpu_possible(cpu_id))
 409                         register_cpu(&cpu[cpu_id], cpu_id, NULL);
 410
 411         return 0;
 412 }
 413
 414 subsys_initcall(topology_init);
 415
 416 static const char *cpu_name[] = {
 417         [CPU_SH7604]    = "SH7604",
 418         [CPU_SH7705]    = "SH7705",
 419         [CPU_SH7708]    = "SH7708",
 420         [CPU_SH7729]    = "SH7729",
 421         [CPU_SH7300]    = "SH7300",
 422         [CPU_SH7750]    = "SH7750",
 423         [CPU_SH7750S]   = "SH7750S",
 424         [CPU_SH7750R]   = "SH7750R",
 425         [CPU_SH7751]    = "SH7751",
 426         [CPU_SH7751R]   = "SH7751R",
 427         [CPU_SH7760]    = "SH7760",
 428         [CPU_SH73180]   = "SH73180",
 429         [CPU_ST40RA]    = "ST40RA",
 430         [CPU_ST40GX1]   = "ST40GX1",
 431         [CPU_SH4_202]   = "SH4-202",
 432         [CPU_SH4_501]   = "SH4-501",
 433         [CPU_SH7770]    = "SH7770",
 434         [CPU_SH7780]    = "SH7780",
 435         [CPU_SH7781]    = "SH7781",
 436         [CPU_SH_NONE]   = "Unknown"
 437 };
 438
 439 const char *get_cpu_subtype(void)
 440 {
 441         return cpu_name[boot_cpu_data.type];
 442 }
 443
 444 #ifdef CONFIG_PROC_FS
 445 static const char *cpu_flags[] = {
 446         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", "ptea", NULL
 447 };
 448
 449 static void show_cpuflags(struct seq_file *m)
 450 {
 451         unsigned long i;
 452
 453         seq_printf(m, "cpu flags\t:");
 454
 455         if (!cpu_data->flags) {
 456                 seq_printf(m, " %s\n", cpu_flags[0]);
 457                 return;
 458         }
 459
 460         for (i = 0; cpu_flags[i]; i++)
 461                 if ((cpu_data->flags & (1 << i)))
 462                         seq_printf(m, " %s", cpu_flags[i+1]);
 463
 464         seq_printf(m, "\n");
 465 }
 466
 467 static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info)
 468 {
 469         unsigned int cache_size;
 470
 471         cache_size = info.ways * info.sets * info.linesz;
 472
 473         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 474                    type, cache_size >> 10, info.ways);
 475 }
 476
 477 /*
 478  *      Get CPU information for use by the procfs.
 479  */
 480 static int show_cpuinfo(struct seq_file *m, void *v)
 481 {
 482         unsigned int cpu = smp_processor_id();
 483
 484         if (!cpu && cpu_online(cpu))
 485                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 486
 487         seq_printf(m, "processor\t: %d\n", cpu);
 488         seq_printf(m, "cpu family\t: %s\n", system_utsname.machine);
 489         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
 490
 491         show_cpuflags(m);
 492
 493         seq_printf(m, "cache type\t: ");
 494
 495         /*
 496          * Check for what type of cache we have, we support both the
 497          * unified cache on the SH-2 and SH-3, as well as the harvard
 498          * style cache on the SH-4.
 499          */
 500         if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) {
 501                 seq_printf(m, "unified\n");
 502                 show_cacheinfo(m, "cache", boot_cpu_data.icache);
 503         } else {
 504                 seq_printf(m, "split (harvard)\n");
 505                 show_cacheinfo(m, "icache", boot_cpu_data.icache);
 506                 show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
 507         }
 508
 509         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 510                      boot_cpu_data.loops_per_jiffy/(500000/HZ),
 511                      (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);
 512
 513         return show_clocks(m);
 514 }
 515
 516 static void *c_start(struct seq_file *m, loff_t *pos)
 517 {
 518         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 519 }
 520 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 521 {
 522         ++*pos;
 523         return c_start(m, pos);
 524 }
 525 static void c_stop(struct seq_file *m, void *v)
 526 {
 527 }
 528 struct seq_operations cpuinfo_op = {
 529         .start  = c_start,
 530         .next   = c_next,
 531         .stop   = c_stop,
 532         .show   = show_cpuinfo,
 533 };
 534 #endif /* CONFIG_PROC_FS */
 535
 536 #ifdef CONFIG_SH_KGDB
 537 /*
 538  * Parse command-line kgdb options.  By default KGDB is enabled,
 539  * entered on error (or other action) using default serial info.
 540  * The command-line option can include a serial port specification
 541  * and an action to override default or configured behavior.
 542  */
 543 struct kgdb_sermap kgdb_sci_sermap =
 544 { "ttySC", 5, kgdb_sci_setup, NULL };
 545
 546 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
 547 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
 548
 549 void kgdb_register_sermap(struct kgdb_sermap *map)
 550 {
 551         struct kgdb_sermap *last;
 552
 553         for (last = kgdb_serlist; last->next; last = last->next)
 554                 ;
 555         last->next = map;
 556         if (!map->namelen) {
 557                 map->namelen = strlen(map->name);
 558         }
 559 }
 560
 561 static int __init kgdb_parse_options(char *options)
 562 {
 563         char c;
 564         int baud;
 565
 566         /* Check for port spec (or use default) */
 567
 568         /* Determine port type and instance */
 569         if (!memcmp(options, "tty", 3)) {
 570                 struct kgdb_sermap *map = kgdb_serlist;
 571
 572                 while (map && memcmp(options, map->name, map->namelen))
 573                         map = map->next;
 574
 575                 if (!map) {
 576                         KGDB_PRINTK("unknown port spec in %s\n", options);
 577                         return -1;
 578                 }
 579
 580                 kgdb_porttype = map;
 581                 kgdb_serial_setup = map->setup_fn;
 582                 kgdb_portnum = options[map->namelen] - '0';
 583                 options += map->namelen + 1;
 584
 585                 options = (*options == ',') ? options+1 : options;
 586
 587                 /* Read optional parameters (baud/parity/bits) */
 588                 baud = simple_strtoul(options, &options, 10);
 589                 if (baud != 0) {
 590                         kgdb_baud = baud;
 591
 592                         c = toupper(*options);
 593                         if (c == 'E' || c == 'O' || c == 'N') {
 594                                 kgdb_parity = c;
 595                                 options++;
 596                         }
 597
 598                         c = *options;
 599                         if (c == '7' || c == '8') {
 600                                 kgdb_bits = c;
 601                                 options++;
 602                         }
 603                         options = (*options == ',') ? options+1 : options;
 604                 }
 605         }
 606
 607         /* Check for action specification */
 608         if (!memcmp(options, "halt", 4)) {
 609                 kgdb_halt = 1;
 610                 options += 4;
 611         } else if (!memcmp(options, "disabled", 8)) {
 612                 kgdb_enabled = 0;
 613                 options += 8;
 614         }
 615
 616         if (*options) {
 617                 KGDB_PRINTK("ignored unknown options: %s\n", options);
 618                 return 0;
 619         }
 620         return 1;
 621 }
 622 __setup("kgdb=", kgdb_parse_options);
 623 #endif /* CONFIG_SH_KGDB */
 624