arch/sh/kernel/setup.c

   1 /*
   2  *  linux/arch/sh/kernel/setup.c
   3  *
   4  *  Copyright (C) 1999  Niibe Yutaka
   5  *  Copyright (C) 2002, 2003  Paul Mundt
   6  */
   7
   8 /*
   9  * This file handles the architecture-dependent parts of initialization
  10  */
  11
  12 #include <linux/screen_info.h>
  13 #include <linux/ioport.h>
  14 #include <linux/init.h>
  15 #include <linux/initrd.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/console.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/utsname.h>
  21 #include <linux/cpu.h>
  22 #include <linux/pfn.h>
  23 #include <linux/fs.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/io.h>
  26 #include <asm/sections.h>
  27 #include <asm/irq.h>
  28 #include <asm/setup.h>
  29 #include <asm/clock.h>
  30
  31 #ifdef CONFIG_SH_KGDB
  32 #include <asm/kgdb.h>
  33 static int kgdb_parse_options(char *options);
  34 #endif
  35 extern void * __rd_start, * __rd_end;
  36 /*
  37  * Machine setup..
  38  */
  39
  40 /*
  41  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  42  * This value will be used at the very early stage of serial setup.
  43  * The bigger value means no problem.
  44  */
  45 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  46 #ifdef CONFIG_VT
  47 struct screen_info screen_info;
  48 #endif
  49
  50 #if defined(CONFIG_SH_UNKNOWN)
  51 struct sh_machine_vector sh_mv;
  52 #endif
  53
  54 extern int root_mountflags;
  55
  56 #define MV_NAME_SIZE 32
  57
  58 static struct sh_machine_vector* __init get_mv_byname(const char* name);
  59
  60 /*
  61  * This is set up by the setup-routine at boot-time
  62  */
  63 #define PARAM   ((unsigned char *)empty_zero_page)
  64
  65 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  66 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  67 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  68 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  69 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  70 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  71 /* ... */
  72 #define COMMAND_LINE ((char *) (PARAM+0x100))
  73
  74 #define RAMDISK_IMAGE_START_MASK        0x07FF
  75 #define RAMDISK_PROMPT_FLAG             0x8000
  76 #define RAMDISK_LOAD_FLAG               0x4000
  77
  78 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  79
  80 static struct resource code_resource = { .name = "Kernel code", };
  81 static struct resource data_resource = { .name = "Kernel data", };
  82
  83 unsigned long memory_start, memory_end;
  84
  85 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
  86                                   struct sh_machine_vector** mvp,
  87                                   unsigned long *mv_io_base)
  88 {
  89         char c = ' ', *to = command_line, *from = COMMAND_LINE;
  90         int len = 0;
  91
  92         /* Save unparsed command line copy for /proc/cmdline */
  93         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
  94         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
  95
  96         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  97         memory_end = memory_start + __MEMORY_SIZE;
  98
  99         for (;;) {
 100                 /*
 101                  * "mem=XXX[kKmM]" defines a size of memory.
 102                  */
 103                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 104                         if (to != command_line)
 105                                 to--;
 106                         {
 107                                 unsigned long mem_size;
 108
 109                                 mem_size = memparse(from+4, &from);
 110                                 memory_end = memory_start + mem_size;
 111                         }
 112                 }
 113
 114                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 115                         char* mv_end;
 116                         char* mv_comma;
 117                         int mv_len;
 118                         if (to != command_line)
 119                                 to--;
 120                         from += 6;
 121                         mv_end = strchr(from, ' ');
 122                         if (mv_end == NULL)
 123                                 mv_end = from + strlen(from);
 124
 125                         mv_comma = strchr(from, ',');
 126                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 127                                 int ints[3];
 128                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 129                                 *mv_io_base = ints[1];
 130                                 mv_len = mv_comma - from;
 131                         } else {
 132                                 mv_len = mv_end - from;
 133                         }
 134                         if (mv_len > (MV_NAME_SIZE-1))
 135                                 mv_len = MV_NAME_SIZE-1;
 136                         memcpy(mv_name, from, mv_len);
 137                         mv_name[mv_len] = '\0';
 138                         from = mv_end;
 139
 140                         *mvp = get_mv_byname(mv_name);
 141                 }
 142
 143                 c = *(from++);
 144                 if (!c)
 145                         break;
 146                 if (COMMAND_LINE_SIZE <= ++len)
 147                         break;
 148                 *(to++) = c;
 149         }
 150         *to = '\0';
 151         *cmdline_p = command_line;
 152 }
 153
 154 static int __init sh_mv_setup(char **cmdline_p)
 155 {
 156 #ifdef CONFIG_SH_UNKNOWN
 157         extern struct sh_machine_vector mv_unknown;
 158 #endif
 159         struct sh_machine_vector *mv = NULL;
 160         char mv_name[MV_NAME_SIZE] = "";
 161         unsigned long mv_io_base = 0;
 162
 163         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
 164
 165 #ifdef CONFIG_SH_UNKNOWN
 166         if (mv == NULL) {
 167                 mv = &mv_unknown;
 168                 if (*mv_name != '\0') {
 169                         printk("Warning: Unsupported machine %s, using unknown\n",
 170                                mv_name);
 171                 }
 172         }
 173         sh_mv = *mv;
 174 #endif
 175
 176         /*
 177          * Manually walk the vec, fill in anything that the board hasn't yet
 178          * by hand, wrapping to the generic implementation.
 179          */
 180 #define mv_set(elem) do { \
 181         if (!sh_mv.mv_##elem) \
 182                 sh_mv.mv_##elem = generic_##elem; \
 183 } while (0)
 184
 185         mv_set(inb);    mv_set(inw);    mv_set(inl);
 186         mv_set(outb);   mv_set(outw);   mv_set(outl);
 187
 188         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 189         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 190
 191         mv_set(insb);   mv_set(insw);   mv_set(insl);
 192         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 193
 194         mv_set(readb);  mv_set(readw);  mv_set(readl);
 195         mv_set(writeb); mv_set(writew); mv_set(writel);
 196
 197         mv_set(ioport_map);
 198         mv_set(ioport_unmap);
 199         mv_set(irq_demux);
 200
 201 #ifdef CONFIG_SH_UNKNOWN
 202         __set_io_port_base(mv_io_base);
 203 #endif
 204
 205         if (!sh_mv.mv_nr_irqs)
 206                 sh_mv.mv_nr_irqs = NR_IRQS;
 207
 208         return 0;
 209 }
 210
 211 void __init setup_arch(char **cmdline_p)
 212 {
 213         unsigned long bootmap_size;
 214         unsigned long start_pfn, max_pfn, max_low_pfn;
 215
 216 #ifdef CONFIG_CMDLINE_BOOL
 217         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 218 #endif
 219
 220         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 221
 222 #ifdef CONFIG_BLK_DEV_RAM
 223         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 224         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 225         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 226 #endif
 227
 228         if (!MOUNT_ROOT_RDONLY)
 229                 root_mountflags &= ~MS_RDONLY;
 230         init_mm.start_code = (unsigned long) _text;
 231         init_mm.end_code = (unsigned long) _etext;
 232         init_mm.end_data = (unsigned long) _edata;
 233         init_mm.brk = (unsigned long) _end;
 234
 235         code_resource.start = (unsigned long)virt_to_phys(_text);
 236         code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
 237         data_resource.start = (unsigned long)virt_to_phys(_etext);
 238         data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
 239
 240         sh_mv_setup(cmdline_p);
 241
 242
 243         /*
 244          * Find the highest page frame number we have available
 245          */
 246         max_pfn = PFN_DOWN(__pa(memory_end));
 247
 248         /*
 249          * Determine low and high memory ranges:
 250          */
 251         max_low_pfn = max_pfn;
 252
 253         /*
 254          * Partially used pages are not usable - thus
 255          * we are rounding upwards:
 256          */
 257         start_pfn = PFN_UP(__pa(_end));
 258
 259         /*
 260          * Find a proper area for the bootmem bitmap. After this
 261          * bootstrap step all allocations (until the page allocator
 262          * is intact) must be done via bootmem_alloc().
 263          */
 264         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 265                                          __MEMORY_START>>PAGE_SHIFT,
 266                                          max_low_pfn);
 267         /*
 268          * Register fully available low RAM pages with the bootmem allocator.
 269          */
 270         {
 271                 unsigned long curr_pfn, last_pfn, pages;
 272
 273                 /*
 274                  * We are rounding up the start address of usable memory:
 275                  */
 276                 curr_pfn = PFN_UP(__MEMORY_START);
 277                 /*
 278                  * ... and at the end of the usable range downwards:
 279                  */
 280                 last_pfn = PFN_DOWN(__pa(memory_end));
 281
 282                 if (last_pfn > max_low_pfn)
 283                         last_pfn = max_low_pfn;
 284
 285                 pages = last_pfn - curr_pfn;
 286                 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
 287                                   PFN_PHYS(pages));
 288         }
 289
 290
 291         /*
 292          * Reserve the kernel text and
 293          * Reserve the bootmem bitmap. We do this in two steps (first step
 294          * was init_bootmem()), because this catches the (definitely buggy)
 295          * case of us accidentally initializing the bootmem allocator with
 296          * an invalid RAM area.
 297          */
 298         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
 299                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 300
 301         /*
 302          * reserve physical page 0 - it's a special BIOS page on many boxes,
 303          * enabling clean reboots, SMP operation, laptop functions.
 304          */
 305         reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
 306
 307 #ifdef CONFIG_BLK_DEV_INITRD
 308         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 309         if (&__rd_start != &__rd_end) {
 310                 LOADER_TYPE = 1;
 311                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 312                                         __MEMORY_START;
 313                 INITRD_SIZE = (unsigned long)&__rd_end -
 314                               (unsigned long)&__rd_start;
 315         }
 316
 317         if (LOADER_TYPE && INITRD_START) {
 318                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 319                         reserve_bootmem_node(NODE_DATA(0), INITRD_START +
 320                                                 __MEMORY_START, INITRD_SIZE);
 321                         initrd_start = INITRD_START + PAGE_OFFSET +
 322                                         __MEMORY_START;
 323                         initrd_end = initrd_start + INITRD_SIZE;
 324                 } else {
 325                         printk("initrd extends beyond end of memory "
 326                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 327                                     INITRD_START + INITRD_SIZE,
 328                                     max_low_pfn << PAGE_SHIFT);
 329                         initrd_start = 0;
 330                 }
 331         }
 332 #endif
 333
 334 #ifdef CONFIG_DUMMY_CONSOLE
 335         conswitchp = &dummy_con;
 336 #endif
 337
 338         /* Perform the machine specific initialisation */
 339         if (likely(sh_mv.mv_setup))
 340                 sh_mv.mv_setup(cmdline_p);
 341
 342         paging_init();
 343 }
 344
 345 struct sh_machine_vector* __init get_mv_byname(const char* name)
 346 {
 347         extern long __machvec_start, __machvec_end;
 348         struct sh_machine_vector *all_vecs =
 349                 (struct sh_machine_vector *)&__machvec_start;
 350
 351         int i, n = ((unsigned long)&__machvec_end
 352                     - (unsigned long)&__machvec_start)/
 353                 sizeof(struct sh_machine_vector);
 354
 355         for (i = 0; i < n; ++i) {
 356                 struct sh_machine_vector *mv = &all_vecs[i];
 357                 if (mv == NULL)
 358                         continue;
 359                 if (strcasecmp(name, get_system_type()) == 0) {
 360                         return mv;
 361                 }
 362         }
 363         return NULL;
 364 }
 365
 366 static struct cpu cpu[NR_CPUS];
 367
 368 static int __init topology_init(void)
 369 {
 370         int cpu_id;
 371
 372         for_each_possible_cpu(cpu_id)
 373                 register_cpu(&cpu[cpu_id], cpu_id);
 374
 375         return 0;
 376 }
 377
 378 subsys_initcall(topology_init);
 379
 380 static const char *cpu_name[] = {
 381         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 382         [CPU_SH7604]    = "SH7604",     [CPU_SH7300]    = "SH7300",
 383         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 384         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 385         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 386         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 387         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 388         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 389         [CPU_SH7760]    = "SH7760",     [CPU_SH73180]   = "SH73180",
 390         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 391         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 392         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 393         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 394         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 395         [CPU_SH_NONE]   = "Unknown"
 396 };
 397
 398 const char *get_cpu_subtype(void)
 399 {
 400         return cpu_name[boot_cpu_data.type];
 401 }
 402
 403 #ifdef CONFIG_PROC_FS
 404 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 405 static const char *cpu_flags[] = {
 406         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 407         "ptea", "llsc", "l2", NULL
 408 };
 409
 410 static void show_cpuflags(struct seq_file *m)
 411 {
 412         unsigned long i;
 413
 414         seq_printf(m, "cpu flags\t:");
 415
 416         if (!cpu_data->flags) {
 417                 seq_printf(m, " %s\n", cpu_flags[0]);
 418                 return;
 419         }
 420
 421         for (i = 0; cpu_flags[i]; i++)
 422                 if ((cpu_data->flags & (1 << i)))
 423                         seq_printf(m, " %s", cpu_flags[i+1]);
 424
 425         seq_printf(m, "\n");
 426 }
 427
 428 static void show_cacheinfo(struct seq_file *m, const char *type,
 429                            struct cache_info info)
 430 {
 431         unsigned int cache_size;
 432
 433         cache_size = info.ways * info.sets * info.linesz;
 434
 435         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 436                    type, cache_size >> 10, info.ways);
 437 }
 438
 439 /*
 440  *      Get CPU information for use by the procfs.
 441  */
 442 static int show_cpuinfo(struct seq_file *m, void *v)
 443 {
 444         unsigned int cpu = smp_processor_id();
 445
 446         if (!cpu && cpu_online(cpu))
 447                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 448
 449         seq_printf(m, "processor\t: %d\n", cpu);
 450         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 451         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
 452
 453         show_cpuflags(m);
 454
 455         seq_printf(m, "cache type\t: ");
 456
 457         /*
 458          * Check for what type of cache we have, we support both the
 459          * unified cache on the SH-2 and SH-3, as well as the harvard
 460          * style cache on the SH-4.
 461          */
 462         if (boot_cpu_data.icache.flags & SH_CACHE_COMBINED) {
 463                 seq_printf(m, "unified\n");
 464                 show_cacheinfo(m, "cache", boot_cpu_data.icache);
 465         } else {
 466                 seq_printf(m, "split (harvard)\n");
 467                 show_cacheinfo(m, "icache", boot_cpu_data.icache);
 468                 show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
 469         }
 470
 471         /* Optional secondary cache */
 472         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE)
 473                 show_cacheinfo(m, "scache", boot_cpu_data.scache);
 474
 475         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 476                      boot_cpu_data.loops_per_jiffy/(500000/HZ),
 477                      (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);
 478
 479         return show_clocks(m);
 480 }
 481
 482 static void *c_start(struct seq_file *m, loff_t *pos)
 483 {
 484         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 485 }
 486 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 487 {
 488         ++*pos;
 489         return c_start(m, pos);
 490 }
 491 static void c_stop(struct seq_file *m, void *v)
 492 {
 493 }
 494 struct seq_operations cpuinfo_op = {
 495         .start  = c_start,
 496         .next   = c_next,
 497         .stop   = c_stop,
 498         .show   = show_cpuinfo,
 499 };
 500 #endif /* CONFIG_PROC_FS */
 501
 502 #ifdef CONFIG_SH_KGDB
 503 /*
 504  * Parse command-line kgdb options.  By default KGDB is enabled,
 505  * entered on error (or other action) using default serial info.
 506  * The command-line option can include a serial port specification
 507  * and an action to override default or configured behavior.
 508  */
 509 struct kgdb_sermap kgdb_sci_sermap =
 510 { "ttySC", 5, kgdb_sci_setup, NULL };
 511
 512 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
 513 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
 514
 515 void kgdb_register_sermap(struct kgdb_sermap *map)
 516 {
 517         struct kgdb_sermap *last;
 518
 519         for (last = kgdb_serlist; last->next; last = last->next)
 520                 ;
 521         last->next = map;
 522         if (!map->namelen) {
 523                 map->namelen = strlen(map->name);
 524         }
 525 }
 526
 527 static int __init kgdb_parse_options(char *options)
 528 {
 529         char c;
 530         int baud;
 531
 532         /* Check for port spec (or use default) */
 533
 534         /* Determine port type and instance */
 535         if (!memcmp(options, "tty", 3)) {
 536                 struct kgdb_sermap *map = kgdb_serlist;
 537
 538                 while (map && memcmp(options, map->name, map->namelen))
 539                         map = map->next;
 540
 541                 if (!map) {
 542                         KGDB_PRINTK("unknown port spec in %s\n", options);
 543                         return -1;
 544                 }
 545
 546                 kgdb_porttype = map;
 547                 kgdb_serial_setup = map->setup_fn;
 548                 kgdb_portnum = options[map->namelen] - '0';
 549                 options += map->namelen + 1;
 550
 551                 options = (*options == ',') ? options+1 : options;
 552
 553                 /* Read optional parameters (baud/parity/bits) */
 554                 baud = simple_strtoul(options, &options, 10);
 555                 if (baud != 0) {
 556                         kgdb_baud = baud;
 557
 558                         c = toupper(*options);
 559                         if (c == 'E' || c == 'O' || c == 'N') {
 560                                 kgdb_parity = c;
 561                                 options++;
 562                         }
 563
 564                         c = *options;
 565                         if (c == '7' || c == '8') {
 566                                 kgdb_bits = c;
 567                                 options++;
 568                         }
 569                         options = (*options == ',') ? options+1 : options;
 570                 }
 571         }
 572
 573         /* Check for action specification */
 574         if (!memcmp(options, "halt", 4)) {
 575                 kgdb_halt = 1;
 576                 options += 4;
 577         } else if (!memcmp(options, "disabled", 8)) {
 578                 kgdb_enabled = 0;
 579                 options += 8;
 580         }
 581
 582         if (*options) {
 583                 KGDB_PRINTK("ignored unknown options: %s\n", options);
 584                 return 0;
 585         }
 586         return 1;
 587 }
 588 __setup("kgdb=", kgdb_parse_options);
 589 #endif /* CONFIG_SH_KGDB */