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 <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 #include <asm/mmu_context.h>
  30
  31 extern void * __rd_start, * __rd_end;
  32
  33 /*
  34  * Machine setup..
  35  */
  36
  37 /*
  38  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  39  * This value will be used at the very early stage of serial setup.
  40  * The bigger value means no problem.
  41  */
  42 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  43 #ifdef CONFIG_VT
  44 struct screen_info screen_info;
  45 #endif
  46
  47 #if defined(CONFIG_SH_UNKNOWN)
  48 struct sh_machine_vector sh_mv;
  49 #endif
  50
  51 extern int root_mountflags;
  52
  53 #define MV_NAME_SIZE 32
  54
  55 static struct sh_machine_vector* __init get_mv_byname(const char* name);
  56
  57 /*
  58  * This is set up by the setup-routine at boot-time
  59  */
  60 #define PARAM   ((unsigned char *)empty_zero_page)
  61
  62 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  63 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  64 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  65 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  66 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  67 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  68 /* ... */
  69 #define COMMAND_LINE ((char *) (PARAM+0x100))
  70
  71 #define RAMDISK_IMAGE_START_MASK        0x07FF
  72 #define RAMDISK_PROMPT_FLAG             0x8000
  73 #define RAMDISK_LOAD_FLAG               0x4000
  74
  75 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  76
  77 static struct resource code_resource = { .name = "Kernel code", };
  78 static struct resource data_resource = { .name = "Kernel data", };
  79
  80 unsigned long memory_start, memory_end;
  81
  82 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
  83                                   struct sh_machine_vector** mvp,
  84                                   unsigned long *mv_io_base)
  85 {
  86         char c = ' ', *to = command_line, *from = COMMAND_LINE;
  87         int len = 0;
  88
  89         /* Save unparsed command line copy for /proc/cmdline */
  90         memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
  91         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
  92
  93         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  94         memory_end = memory_start + __MEMORY_SIZE;
  95
  96         for (;;) {
  97                 /*
  98                  * "mem=XXX[kKmM]" defines a size of memory.
  99                  */
 100                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 101                         if (to != command_line)
 102                                 to--;
 103                         {
 104                                 unsigned long mem_size;
 105
 106                                 mem_size = memparse(from+4, &from);
 107                                 memory_end = memory_start + mem_size;
 108                         }
 109                 }
 110
 111                 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 112                         char* mv_end;
 113                         char* mv_comma;
 114                         int mv_len;
 115                         if (to != command_line)
 116                                 to--;
 117                         from += 6;
 118                         mv_end = strchr(from, ' ');
 119                         if (mv_end == NULL)
 120                                 mv_end = from + strlen(from);
 121
 122                         mv_comma = strchr(from, ',');
 123                         if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 124                                 int ints[3];
 125                                 get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 126                                 *mv_io_base = ints[1];
 127                                 mv_len = mv_comma - from;
 128                         } else {
 129                                 mv_len = mv_end - from;
 130                         }
 131                         if (mv_len > (MV_NAME_SIZE-1))
 132                                 mv_len = MV_NAME_SIZE-1;
 133                         memcpy(mv_name, from, mv_len);
 134                         mv_name[mv_len] = '\0';
 135                         from = mv_end;
 136
 137                         *mvp = get_mv_byname(mv_name);
 138                 }
 139
 140                 c = *(from++);
 141                 if (!c)
 142                         break;
 143                 if (COMMAND_LINE_SIZE <= ++len)
 144                         break;
 145                 *(to++) = c;
 146         }
 147         *to = '\0';
 148         *cmdline_p = command_line;
 149 }
 150
 151 static int __init sh_mv_setup(char **cmdline_p)
 152 {
 153 #ifdef CONFIG_SH_UNKNOWN
 154         extern struct sh_machine_vector mv_unknown;
 155 #endif
 156         struct sh_machine_vector *mv = NULL;
 157         char mv_name[MV_NAME_SIZE] = "";
 158         unsigned long mv_io_base = 0;
 159
 160         parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
 161
 162 #ifdef CONFIG_SH_UNKNOWN
 163         if (mv == NULL) {
 164                 mv = &mv_unknown;
 165                 if (*mv_name != '\0') {
 166                         printk("Warning: Unsupported machine %s, using unknown\n",
 167                                mv_name);
 168                 }
 169         }
 170         sh_mv = *mv;
 171 #endif
 172
 173         /*
 174          * Manually walk the vec, fill in anything that the board hasn't yet
 175          * by hand, wrapping to the generic implementation.
 176          */
 177 #define mv_set(elem) do { \
 178         if (!sh_mv.mv_##elem) \
 179                 sh_mv.mv_##elem = generic_##elem; \
 180 } while (0)
 181
 182         mv_set(inb);    mv_set(inw);    mv_set(inl);
 183         mv_set(outb);   mv_set(outw);   mv_set(outl);
 184
 185         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 186         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 187
 188         mv_set(insb);   mv_set(insw);   mv_set(insl);
 189         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 190
 191         mv_set(readb);  mv_set(readw);  mv_set(readl);
 192         mv_set(writeb); mv_set(writew); mv_set(writel);
 193
 194         mv_set(ioport_map);
 195         mv_set(ioport_unmap);
 196         mv_set(irq_demux);
 197
 198 #ifdef CONFIG_SH_UNKNOWN
 199         __set_io_port_base(mv_io_base);
 200 #endif
 201
 202         if (!sh_mv.mv_nr_irqs)
 203                 sh_mv.mv_nr_irqs = NR_IRQS;
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * Register fully available low RAM pages with the bootmem allocator.
 210  */
 211 static void __init register_bootmem_low_pages(void)
 212 {
 213         unsigned long curr_pfn, last_pfn, pages;
 214
 215         /*
 216          * We are rounding up the start address of usable memory:
 217          */
 218         curr_pfn = PFN_UP(__MEMORY_START);
 219
 220         /*
 221          * ... and at the end of the usable range downwards:
 222          */
 223         last_pfn = PFN_DOWN(__pa(memory_end));
 224
 225         if (last_pfn > max_low_pfn)
 226                 last_pfn = max_low_pfn;
 227
 228         pages = last_pfn - curr_pfn;
 229         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 230 }
 231
 232 void __init setup_bootmem_allocator(unsigned long start_pfn)
 233 {
 234         unsigned long bootmap_size;
 235
 236         /*
 237          * Find a proper area for the bootmem bitmap. After this
 238          * bootstrap step all allocations (until the page allocator
 239          * is intact) must be done via bootmem_alloc().
 240          */
 241         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 242                                          min_low_pfn, max_low_pfn);
 243
 244         register_bootmem_low_pages();
 245
 246         node_set_online(0);
 247
 248         /*
 249          * Reserve the kernel text and
 250          * Reserve the bootmem bitmap. We do this in two steps (first step
 251          * was init_bootmem()), because this catches the (definitely buggy)
 252          * case of us accidentally initializing the bootmem allocator with
 253          * an invalid RAM area.
 254          */
 255         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 256                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 257
 258         /*
 259          * reserve physical page 0 - it's a special BIOS page on many boxes,
 260          * enabling clean reboots, SMP operation, laptop functions.
 261          */
 262         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 263
 264 #ifdef CONFIG_BLK_DEV_INITRD
 265         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 266         if (&__rd_start != &__rd_end) {
 267                 LOADER_TYPE = 1;
 268                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 269                                         __MEMORY_START;
 270                 INITRD_SIZE = (unsigned long)&__rd_end -
 271                               (unsigned long)&__rd_start;
 272         }
 273
 274         if (LOADER_TYPE && INITRD_START) {
 275                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 276                         reserve_bootmem(INITRD_START + __MEMORY_START,
 277                                         INITRD_SIZE);
 278                         initrd_start = INITRD_START + PAGE_OFFSET +
 279                                         __MEMORY_START;
 280                         initrd_end = initrd_start + INITRD_SIZE;
 281                 } else {
 282                         printk("initrd extends beyond end of memory "
 283                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 284                                     INITRD_START + INITRD_SIZE,
 285                                     max_low_pfn << PAGE_SHIFT);
 286                         initrd_start = 0;
 287                 }
 288         }
 289 #endif
 290 }
 291
 292 #ifndef CONFIG_NEED_MULTIPLE_NODES
 293 static void __init setup_memory(void)
 294 {
 295         unsigned long start_pfn;
 296
 297         /*
 298          * Partially used pages are not usable - thus
 299          * we are rounding upwards:
 300          */
 301         start_pfn = PFN_UP(__pa(_end));
 302         setup_bootmem_allocator(start_pfn);
 303 }
 304 #else
 305 extern void __init setup_memory(void);
 306 #endif
 307
 308 void __init setup_arch(char **cmdline_p)
 309 {
 310         enable_mmu();
 311
 312 #ifdef CONFIG_CMDLINE_BOOL
 313         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 314 #endif
 315
 316         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 317
 318 #ifdef CONFIG_BLK_DEV_RAM
 319         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 320         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 321         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 322 #endif
 323
 324         if (!MOUNT_ROOT_RDONLY)
 325                 root_mountflags &= ~MS_RDONLY;
 326         init_mm.start_code = (unsigned long) _text;
 327         init_mm.end_code = (unsigned long) _etext;
 328         init_mm.end_data = (unsigned long) _edata;
 329         init_mm.brk = (unsigned long) _end;
 330
 331         code_resource.start = virt_to_phys(_text);
 332         code_resource.end = virt_to_phys(_etext)-1;
 333         data_resource.start = virt_to_phys(_etext);
 334         data_resource.end = virt_to_phys(_edata)-1;
 335
 336         parse_early_param();
 337
 338         sh_mv_setup(cmdline_p);
 339
 340         /*
 341          * Find the highest page frame number we have available
 342          */
 343         max_pfn = PFN_DOWN(__pa(memory_end));
 344
 345         /*
 346          * Determine low and high memory ranges:
 347          */
 348         max_low_pfn = max_pfn;
 349         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 350
 351         nodes_clear(node_online_map);
 352         setup_memory();
 353         paging_init();
 354         sparse_init();
 355
 356 #ifdef CONFIG_DUMMY_CONSOLE
 357         conswitchp = &dummy_con;
 358 #endif
 359
 360         /* Perform the machine specific initialisation */
 361         if (likely(sh_mv.mv_setup))
 362                 sh_mv.mv_setup(cmdline_p);
 363 }
 364
 365 struct sh_machine_vector* __init get_mv_byname(const char* name)
 366 {
 367         extern long __machvec_start, __machvec_end;
 368         struct sh_machine_vector *all_vecs =
 369                 (struct sh_machine_vector *)&__machvec_start;
 370
 371         int i, n = ((unsigned long)&__machvec_end
 372                     - (unsigned long)&__machvec_start)/
 373                 sizeof(struct sh_machine_vector);
 374
 375         for (i = 0; i < n; ++i) {
 376                 struct sh_machine_vector *mv = &all_vecs[i];
 377                 if (mv == NULL)
 378                         continue;
 379                 if (strcasecmp(name, get_system_type()) == 0) {
 380                         return mv;
 381                 }
 382         }
 383         return NULL;
 384 }
 385
 386 static struct cpu cpu[NR_CPUS];
 387
 388 static int __init topology_init(void)
 389 {
 390         int cpu_id;
 391
 392         for_each_possible_cpu(cpu_id)
 393                 register_cpu(&cpu[cpu_id], cpu_id);
 394
 395         return 0;
 396 }
 397
 398 subsys_initcall(topology_init);
 399
 400 static const char *cpu_name[] = {
 401         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 402         [CPU_SH7604]    = "SH7604",     [CPU_SH7300]    = "SH7300",
 403         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 404         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 405         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 406         [CPU_SH7712]    = "SH7712",
 407         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 408         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 409         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 410         [CPU_SH7760]    = "SH7760",     [CPU_SH73180]   = "SH73180",
 411         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 412         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 413         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 414         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 415         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 416         [CPU_SH_NONE]   = "Unknown"
 417 };
 418
 419 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 420 {
 421         return cpu_name[c->type];
 422 }
 423
 424 #ifdef CONFIG_PROC_FS
 425 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 426 static const char *cpu_flags[] = {
 427         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 428         "ptea", "llsc", "l2", NULL
 429 };
 430
 431 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 432 {
 433         unsigned long i;
 434
 435         seq_printf(m, "cpu flags\t:");
 436
 437         if (!c->flags) {
 438                 seq_printf(m, " %s\n", cpu_flags[0]);
 439                 return;
 440         }
 441
 442         for (i = 0; cpu_flags[i]; i++)
 443                 if ((c->flags & (1 << i)))
 444                         seq_printf(m, " %s", cpu_flags[i+1]);
 445
 446         seq_printf(m, "\n");
 447 }
 448
 449 static void show_cacheinfo(struct seq_file *m, const char *type,
 450                            struct cache_info info)
 451 {
 452         unsigned int cache_size;
 453
 454         cache_size = info.ways * info.sets * info.linesz;
 455
 456         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 457                    type, cache_size >> 10, info.ways);
 458 }
 459
 460 /*
 461  *      Get CPU information for use by the procfs.
 462  */
 463 static int show_cpuinfo(struct seq_file *m, void *v)
 464 {
 465         struct sh_cpuinfo *c = v;
 466         unsigned int cpu = c - cpu_data;
 467
 468         if (!cpu_online(cpu))
 469                 return 0;
 470
 471         if (cpu == 0)
 472                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 473
 474         seq_printf(m, "processor\t: %d\n", cpu);
 475         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 476         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 477
 478         show_cpuflags(m, c);
 479
 480         seq_printf(m, "cache type\t: ");
 481
 482         /*
 483          * Check for what type of cache we have, we support both the
 484          * unified cache on the SH-2 and SH-3, as well as the harvard
 485          * style cache on the SH-4.
 486          */
 487         if (c->icache.flags & SH_CACHE_COMBINED) {
 488                 seq_printf(m, "unified\n");
 489                 show_cacheinfo(m, "cache", c->icache);
 490         } else {
 491                 seq_printf(m, "split (harvard)\n");
 492                 show_cacheinfo(m, "icache", c->icache);
 493                 show_cacheinfo(m, "dcache", c->dcache);
 494         }
 495
 496         /* Optional secondary cache */
 497         if (c->flags & CPU_HAS_L2_CACHE)
 498                 show_cacheinfo(m, "scache", c->scache);
 499
 500         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 501                      c->loops_per_jiffy/(500000/HZ),
 502                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 503
 504         return 0;
 505 }
 506
 507 static void *c_start(struct seq_file *m, loff_t *pos)
 508 {
 509         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 510 }
 511 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 512 {
 513         ++*pos;
 514         return c_start(m, pos);
 515 }
 516 static void c_stop(struct seq_file *m, void *v)
 517 {
 518 }
 519 struct seq_operations cpuinfo_op = {
 520         .start  = c_start,
 521         .next   = c_next,
 522         .stop   = c_stop,
 523         .show   = show_cpuinfo,
 524 };
 525 #endif /* CONFIG_PROC_FS */