arch/sh/kernel/setup.c

   1 /*
   2  * arch/sh/kernel/setup.c
   3  *
   4  * This file handles the architecture-dependent parts of initialization
   5  *
   6  *  Copyright (C) 1999  Niibe Yutaka
   7  *  Copyright (C) 2002 - 2007 Paul Mundt
   8  */
   9 #include <linux/screen_info.h>
  10 #include <linux/ioport.h>
  11 #include <linux/init.h>
  12 #include <linux/initrd.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/console.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/root_dev.h>
  17 #include <linux/utsname.h>
  18 #include <linux/nodemask.h>
  19 #include <linux/cpu.h>
  20 #include <linux/pfn.h>
  21 #include <linux/fs.h>
  22 #include <linux/mm.h>
  23 #include <linux/kexec.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 #include <asm/mmu_context.h>
  31
  32 extern void * __rd_start, * __rd_end;
  33
  34 /*
  35  * Machine setup..
  36  */
  37
  38 /*
  39  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  40  * This value will be used at the very early stage of serial setup.
  41  * The bigger value means no problem.
  42  */
  43 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  44 #ifdef CONFIG_VT
  45 struct screen_info screen_info;
  46 #endif
  47
  48 #if defined(CONFIG_SH_UNKNOWN)
  49 struct sh_machine_vector sh_mv;
  50 #endif
  51
  52 extern int root_mountflags;
  53
  54 #define MV_NAME_SIZE 32
  55
  56 static struct sh_machine_vector* __init get_mv_byname(const char* name);
  57
  58 /*
  59  * This is set up by the setup-routine at boot-time
  60  */
  61 #define PARAM   ((unsigned char *)empty_zero_page)
  62
  63 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  64 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  65 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  66 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  67 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  68 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  69 /* ... */
  70 #define COMMAND_LINE ((char *) (PARAM+0x100))
  71
  72 #define RAMDISK_IMAGE_START_MASK        0x07FF
  73 #define RAMDISK_PROMPT_FLAG             0x8000
  74 #define RAMDISK_LOAD_FLAG               0x4000
  75
  76 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  77
  78 static struct resource code_resource = { .name = "Kernel code", };
  79 static struct resource data_resource = { .name = "Kernel data", };
  80
  81 unsigned long memory_start, memory_end;
  82
  83 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
  84                                   struct sh_machine_vector** mvp,
  85                                   unsigned long *mv_io_base)
  86 {
  87         char c = ' ', *to = command_line, *from = COMMAND_LINE;
  88         int len = 0;
  89
  90         /* Save unparsed command line copy for /proc/cmdline */
  91         memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
  92         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
  93
  94         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  95         memory_end = memory_start + __MEMORY_SIZE;
  96
  97         for (;;) {
  98                 /*
  99                  * "mem=XXX[kKmM]" defines a size of memory.
 100                  */
 101                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 102                         if (to != command_line)
 103                                 to--;
 104                         {
 105                                 unsigned long mem_size;
 106
 107                                 mem_size = memparse(from+4, &from);
 108                                 memory_end = memory_start + mem_size;
 109                         }
 110                 }
 111
 112                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 113                         char* mv_end;
 114                         char* mv_comma;
 115                         int mv_len;
 116                         if (to != command_line)
 117                                 to--;
 118                         from += 6;
 119                         mv_end = strchr(from, ' ');
 120                         if (mv_end == NULL)
 121                                 mv_end = from + strlen(from);
 122
 123                         mv_comma = strchr(from, ',');
 124                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 125                                 int ints[3];
 126                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 127                                 *mv_io_base = ints[1];
 128                                 mv_len = mv_comma - from;
 129                         } else {
 130                                 mv_len = mv_end - from;
 131                         }
 132                         if (mv_len > (MV_NAME_SIZE-1))
 133                                 mv_len = MV_NAME_SIZE-1;
 134                         memcpy(mv_name, from, mv_len);
 135                         mv_name[mv_len] = '\0';
 136                         from = mv_end;
 137
 138                         *mvp = get_mv_byname(mv_name);
 139                 }
 140
 141                 c = *(from++);
 142                 if (!c)
 143                         break;
 144                 if (COMMAND_LINE_SIZE <= ++len)
 145                         break;
 146                 *(to++) = c;
 147         }
 148         *to = '\0';
 149         *cmdline_p = command_line;
 150 }
 151
 152 static int __init sh_mv_setup(char **cmdline_p)
 153 {
 154 #ifdef CONFIG_SH_UNKNOWN
 155         extern struct sh_machine_vector mv_unknown;
 156 #endif
 157         struct sh_machine_vector *mv = NULL;
 158         char mv_name[MV_NAME_SIZE] = "";
 159         unsigned long mv_io_base = 0;
 160
 161         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
 162
 163 #ifdef CONFIG_SH_UNKNOWN
 164         if (mv == NULL) {
 165                 mv = &mv_unknown;
 166                 if (*mv_name != '\0') {
 167                         printk("Warning: Unsupported machine %s, using unknown\n",
 168                                mv_name);
 169                 }
 170         }
 171         sh_mv = *mv;
 172 #endif
 173
 174         /*
 175          * Manually walk the vec, fill in anything that the board hasn't yet
 176          * by hand, wrapping to the generic implementation.
 177          */
 178 #define mv_set(elem) do { \
 179         if (!sh_mv.mv_##elem) \
 180                 sh_mv.mv_##elem = generic_##elem; \
 181 } while (0)
 182
 183         mv_set(inb);    mv_set(inw);    mv_set(inl);
 184         mv_set(outb);   mv_set(outw);   mv_set(outl);
 185
 186         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 187         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 188
 189         mv_set(insb);   mv_set(insw);   mv_set(insl);
 190         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 191
 192         mv_set(readb);  mv_set(readw);  mv_set(readl);
 193         mv_set(writeb); mv_set(writew); mv_set(writel);
 194
 195         mv_set(ioport_map);
 196         mv_set(ioport_unmap);
 197         mv_set(irq_demux);
 198
 199 #ifdef CONFIG_SH_UNKNOWN
 200         __set_io_port_base(mv_io_base);
 201 #endif
 202
 203         if (!sh_mv.mv_nr_irqs)
 204                 sh_mv.mv_nr_irqs = NR_IRQS;
 205
 206         return 0;
 207 }
 208
 209 /*
 210  * Register fully available low RAM pages with the bootmem allocator.
 211  */
 212 static void __init register_bootmem_low_pages(void)
 213 {
 214         unsigned long curr_pfn, last_pfn, pages;
 215
 216         /*
 217          * We are rounding up the start address of usable memory:
 218          */
 219         curr_pfn = PFN_UP(__MEMORY_START);
 220
 221         /*
 222          * ... and at the end of the usable range downwards:
 223          */
 224         last_pfn = PFN_DOWN(__pa(memory_end));
 225
 226         if (last_pfn > max_low_pfn)
 227                 last_pfn = max_low_pfn;
 228
 229         pages = last_pfn - curr_pfn;
 230         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 231 }
 232
 233 void __init setup_bootmem_allocator(unsigned long start_pfn)
 234 {
 235         unsigned long bootmap_size;
 236
 237         /*
 238          * Find a proper area for the bootmem bitmap. After this
 239          * bootstrap step all allocations (until the page allocator
 240          * is intact) must be done via bootmem_alloc().
 241          */
 242         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 243                                          min_low_pfn, max_low_pfn);
 244
 245         register_bootmem_low_pages();
 246
 247         node_set_online(0);
 248
 249         /*
 250          * Reserve the kernel text and
 251          * Reserve the bootmem bitmap. We do this in two steps (first step
 252          * was init_bootmem()), because this catches the (definitely buggy)
 253          * case of us accidentally initializing the bootmem allocator with
 254          * an invalid RAM area.
 255          */
 256         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 257                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 258
 259         /*
 260          * reserve physical page 0 - it's a special BIOS page on many boxes,
 261          * enabling clean reboots, SMP operation, laptop functions.
 262          */
 263         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 264
 265 #ifdef CONFIG_BLK_DEV_INITRD
 266         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 267         if (&__rd_start != &__rd_end) {
 268                 LOADER_TYPE = 1;
 269                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 270                                         __MEMORY_START;
 271                 INITRD_SIZE = (unsigned long)&__rd_end -
 272                               (unsigned long)&__rd_start;
 273         }
 274
 275         if (LOADER_TYPE && INITRD_START) {
 276                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 277                         reserve_bootmem(INITRD_START + __MEMORY_START,
 278                                         INITRD_SIZE);
 279                         initrd_start = INITRD_START + PAGE_OFFSET +
 280                                         __MEMORY_START;
 281                         initrd_end = initrd_start + INITRD_SIZE;
 282                 } else {
 283                         printk("initrd extends beyond end of memory "
 284                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 285                                     INITRD_START + INITRD_SIZE,
 286                                     max_low_pfn << PAGE_SHIFT);
 287                         initrd_start = 0;
 288                 }
 289         }
 290 #endif
 291 #ifdef CONFIG_KEXEC
 292         if (crashk_res.start != crashk_res.end)
 293                 reserve_bootmem(crashk_res.start,
 294                         crashk_res.end - crashk_res.start + 1);
 295 #endif
 296 }
 297
 298 #ifndef CONFIG_NEED_MULTIPLE_NODES
 299 static void __init setup_memory(void)
 300 {
 301         unsigned long start_pfn;
 302
 303         /*
 304          * Partially used pages are not usable - thus
 305          * we are rounding upwards:
 306          */
 307         start_pfn = PFN_UP(__pa(_end));
 308         setup_bootmem_allocator(start_pfn);
 309 }
 310 #else
 311 extern void __init setup_memory(void);
 312 #endif
 313
 314 void __init setup_arch(char **cmdline_p)
 315 {
 316         enable_mmu();
 317
 318 #ifdef CONFIG_CMDLINE_BOOL
 319         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 320 #endif
 321
 322         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 323
 324 #ifdef CONFIG_BLK_DEV_RAM
 325         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 326         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 327         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 328 #endif
 329
 330         if (!MOUNT_ROOT_RDONLY)
 331                 root_mountflags &= ~MS_RDONLY;
 332         init_mm.start_code = (unsigned long) _text;
 333         init_mm.end_code = (unsigned long) _etext;
 334         init_mm.end_data = (unsigned long) _edata;
 335         init_mm.brk = (unsigned long) _end;
 336
 337         code_resource.start = virt_to_phys(_text);
 338         code_resource.end = virt_to_phys(_etext)-1;
 339         data_resource.start = virt_to_phys(_etext);
 340         data_resource.end = virt_to_phys(_edata)-1;
 341
 342         parse_early_param();
 343
 344         sh_mv_setup(cmdline_p);
 345
 346         /*
 347          * Find the highest page frame number we have available
 348          */
 349         max_pfn = PFN_DOWN(__pa(memory_end));
 350
 351         /*
 352          * Determine low and high memory ranges:
 353          */
 354         max_low_pfn = max_pfn;
 355         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 356
 357         nodes_clear(node_online_map);
 358         setup_memory();
 359         paging_init();
 360         sparse_init();
 361
 362 #ifdef CONFIG_DUMMY_CONSOLE
 363         conswitchp = &dummy_con;
 364 #endif
 365
 366         /* Perform the machine specific initialisation */
 367         if (likely(sh_mv.mv_setup))
 368                 sh_mv.mv_setup(cmdline_p);
 369 }
 370
 371 struct sh_machine_vector* __init get_mv_byname(const char* name)
 372 {
 373         extern long __machvec_start, __machvec_end;
 374         struct sh_machine_vector *all_vecs =
 375                 (struct sh_machine_vector *)&__machvec_start;
 376
 377         int i, n = ((unsigned long)&__machvec_end
 378                     - (unsigned long)&__machvec_start)/
 379                 sizeof(struct sh_machine_vector);
 380
 381         for (i = 0; i < n; ++i) {
 382                 struct sh_machine_vector *mv = &all_vecs[i];
 383                 if (mv == NULL)
 384                         continue;
 385                 if (strcasecmp(name, get_system_type()) == 0) {
 386                         return mv;
 387                 }
 388         }
 389         return NULL;
 390 }
 391
 392 static struct cpu cpu[NR_CPUS];
 393
 394 static int __init topology_init(void)
 395 {
 396         int cpu_id;
 397
 398         for_each_possible_cpu(cpu_id)
 399                 register_cpu(&cpu[cpu_id], cpu_id);
 400
 401         return 0;
 402 }
 403
 404 subsys_initcall(topology_init);
 405
 406 static const char *cpu_name[] = {
 407         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 408         [CPU_SH7604]    = "SH7604",     [CPU_SH7300]    = "SH7300",
 409         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 410         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 411         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 412         [CPU_SH7712]    = "SH7712",
 413         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 414         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 415         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 416         [CPU_SH7760]    = "SH7760",     [CPU_SH73180]   = "SH73180",
 417         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 418         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 419         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 420         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 421         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 422         [CPU_SH_NONE]   = "Unknown"
 423 };
 424
 425 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 426 {
 427         return cpu_name[c->type];
 428 }
 429
 430 #ifdef CONFIG_PROC_FS
 431 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 432 static const char *cpu_flags[] = {
 433         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 434         "ptea", "llsc", "l2", NULL
 435 };
 436
 437 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 438 {
 439         unsigned long i;
 440
 441         seq_printf(m, "cpu flags\t:");
 442
 443         if (!c->flags) {
 444                 seq_printf(m, " %s\n", cpu_flags[0]);
 445                 return;
 446         }
 447
 448         for (i = 0; cpu_flags[i]; i++)
 449                 if ((c->flags & (1 << i)))
 450                         seq_printf(m, " %s", cpu_flags[i+1]);
 451
 452         seq_printf(m, "\n");
 453 }
 454
 455 static void show_cacheinfo(struct seq_file *m, const char *type,
 456                            struct cache_info info)
 457 {
 458         unsigned int cache_size;
 459
 460         cache_size = info.ways * info.sets * info.linesz;
 461
 462         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 463                    type, cache_size >> 10, info.ways);
 464 }
 465
 466 /*
 467  *      Get CPU information for use by the procfs.
 468  */
 469 static int show_cpuinfo(struct seq_file *m, void *v)
 470 {
 471         struct sh_cpuinfo *c = v;
 472         unsigned int cpu = c - cpu_data;
 473
 474         if (!cpu_online(cpu))
 475                 return 0;
 476
 477         if (cpu == 0)
 478                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 479
 480         seq_printf(m, "processor\t: %d\n", cpu);
 481         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 482         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 483
 484         show_cpuflags(m, c);
 485
 486         seq_printf(m, "cache type\t: ");
 487
 488         /*
 489          * Check for what type of cache we have, we support both the
 490          * unified cache on the SH-2 and SH-3, as well as the harvard
 491          * style cache on the SH-4.
 492          */
 493         if (c->icache.flags & SH_CACHE_COMBINED) {
 494                 seq_printf(m, "unified\n");
 495                 show_cacheinfo(m, "cache", c->icache);
 496         } else {
 497                 seq_printf(m, "split (harvard)\n");
 498                 show_cacheinfo(m, "icache", c->icache);
 499                 show_cacheinfo(m, "dcache", c->dcache);
 500         }
 501
 502         /* Optional secondary cache */
 503         if (c->flags & CPU_HAS_L2_CACHE)
 504                 show_cacheinfo(m, "scache", c->scache);
 505
 506         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 507                      c->loops_per_jiffy/(500000/HZ),
 508                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 509
 510         return 0;
 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 */