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 <linux/module.h>
  25 #include <linux/smp.h>
  26 #include <linux/err.h>
  27 #include <linux/debugfs.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30 #include <asm/page.h>
  31 #include <asm/elf.h>
  32 #include <asm/sections.h>
  33 #include <asm/irq.h>
  34 #include <asm/setup.h>
  35 #include <asm/clock.h>
  36 #include <asm/mmu_context.h>
  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 cpu_data[NR_CPUS] __read_mostly = {
  44         [0] = {
  45                 .type                   = CPU_SH_NONE,
  46                 .loops_per_jiffy        = 10000000,
  47         },
  48 };
  49 EXPORT_SYMBOL(cpu_data);
  50
  51 /*
  52  * The machine vector. First entry in .machvec.init, or clobbered by
  53  * sh_mv= on the command line, prior to .machvec.init teardown.
  54  */
  55 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  56 EXPORT_SYMBOL(sh_mv);
  57
  58 #ifdef CONFIG_VT
  59 struct screen_info screen_info;
  60 #endif
  61
  62 extern int root_mountflags;
  63
  64 #define RAMDISK_IMAGE_START_MASK        0x07FF
  65 #define RAMDISK_PROMPT_FLAG             0x8000
  66 #define RAMDISK_LOAD_FLAG               0x4000
  67
  68 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  69
  70 static struct resource code_resource = {
  71         .name = "Kernel code",
  72         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  73 };
  74
  75 static struct resource data_resource = {
  76         .name = "Kernel data",
  77         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  78 };
  79
  80 static struct resource bss_resource = {
  81         .name   = "Kernel bss",
  82         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  83 };
  84
  85 unsigned long memory_start;
  86 EXPORT_SYMBOL(memory_start);
  87 unsigned long memory_end = 0;
  88 EXPORT_SYMBOL(memory_end);
  89
  90 static struct resource mem_resources[MAX_NUMNODES];
  91
  92 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
  93
  94 static int __init early_parse_mem(char *p)
  95 {
  96         unsigned long size;
  97
  98         memory_start = (unsigned long)__va(__MEMORY_START);
  99         size = memparse(p, &p);
 100
 101         if (size > __MEMORY_SIZE) {
 102                 static char msg[] __initdata = KERN_ERR
 103                         "Using mem= to increase the size of kernel memory "
 104                         "is not allowed.\n"
 105                         "  Recompile the kernel with the correct value for "
 106                         "CONFIG_MEMORY_SIZE.\n";
 107                 printk(msg);
 108                 return 0;
 109         }
 110
 111         memory_end = memory_start + size;
 112
 113         return 0;
 114 }
 115 early_param("mem", early_parse_mem);
 116
 117 /*
 118  * Register fully available low RAM pages with the bootmem allocator.
 119  */
 120 static void __init register_bootmem_low_pages(void)
 121 {
 122         unsigned long curr_pfn, last_pfn, pages;
 123
 124         /*
 125          * We are rounding up the start address of usable memory:
 126          */
 127         curr_pfn = PFN_UP(__MEMORY_START);
 128
 129         /*
 130          * ... and at the end of the usable range downwards:
 131          */
 132         last_pfn = PFN_DOWN(__pa(memory_end));
 133
 134         if (last_pfn > max_low_pfn)
 135                 last_pfn = max_low_pfn;
 136
 137         pages = last_pfn - curr_pfn;
 138         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 139 }
 140
 141 #ifdef CONFIG_KEXEC
 142 static void __init reserve_crashkernel(void)
 143 {
 144         unsigned long long free_mem;
 145         unsigned long long crash_size, crash_base;
 146         int ret;
 147
 148         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 149
 150         ret = parse_crashkernel(boot_command_line, free_mem,
 151                         &crash_size, &crash_base);
 152         if (ret == 0 && crash_size) {
 153                 if (crash_base <= 0) {
 154                         printk(KERN_INFO "crashkernel reservation failed - "
 155                                         "you have to specify a base address\n");
 156                         return;
 157                 }
 158
 159                 if (reserve_bootmem(crash_base, crash_size,
 160                                         BOOTMEM_EXCLUSIVE) < 0) {
 161                         printk(KERN_INFO "crashkernel reservation failed - "
 162                                         "memory is in use\n");
 163                         return;
 164                 }
 165
 166                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 167                                 "for crashkernel (System RAM: %ldMB)\n",
 168                                 (unsigned long)(crash_size >> 20),
 169                                 (unsigned long)(crash_base >> 20),
 170                                 (unsigned long)(free_mem >> 20));
 171                 crashk_res.start = crash_base;
 172                 crashk_res.end   = crash_base + crash_size - 1;
 173         }
 174 }
 175 #else
 176 static inline void __init reserve_crashkernel(void)
 177 {}
 178 #endif
 179
 180 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 181                                                 unsigned long end_pfn)
 182 {
 183         struct resource *res = &mem_resources[nid];
 184
 185         WARN_ON(res->name); /* max one active range per node for now */
 186
 187         res->name = "System RAM";
 188         res->start = start_pfn << PAGE_SHIFT;
 189         res->end = (end_pfn << PAGE_SHIFT) - 1;
 190         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 191         if (request_resource(&iomem_resource, res)) {
 192                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 193                        start_pfn, end_pfn);
 194                 return;
 195         }
 196
 197         /*
 198          *  We don't know which RAM region contains kernel data,
 199          *  so we try it repeatedly and let the resource manager
 200          *  test it.
 201          */
 202         request_resource(res, &code_resource);
 203         request_resource(res, &data_resource);
 204         request_resource(res, &bss_resource);
 205
 206 #ifdef CONFIG_KEXEC
 207         if (crashk_res.start != crashk_res.end)
 208                 request_resource(res, &crashk_res);
 209 #endif
 210
 211         add_active_range(nid, start_pfn, end_pfn);
 212 }
 213
 214 void __init setup_bootmem_allocator(unsigned long free_pfn)
 215 {
 216         unsigned long bootmap_size;
 217
 218         /*
 219          * Find a proper area for the bootmem bitmap. After this
 220          * bootstrap step all allocations (until the page allocator
 221          * is intact) must be done via bootmem_alloc().
 222          */
 223         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 224                                          min_low_pfn, max_low_pfn);
 225
 226         __add_active_range(0, min_low_pfn, max_low_pfn);
 227         register_bootmem_low_pages();
 228
 229         node_set_online(0);
 230
 231         /*
 232          * Reserve the kernel text and
 233          * Reserve the bootmem bitmap. We do this in two steps (first step
 234          * was init_bootmem()), because this catches the (definitely buggy)
 235          * case of us accidentally initializing the bootmem allocator with
 236          * an invalid RAM area.
 237          */
 238         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 239                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START,
 240                 BOOTMEM_DEFAULT);
 241
 242         /*
 243          * reserve physical page 0 - it's a special BIOS page on many boxes,
 244          * enabling clean reboots, SMP operation, laptop functions.
 245          */
 246         reserve_bootmem(__MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
 247
 248         sparse_memory_present_with_active_regions(0);
 249
 250 #ifdef CONFIG_BLK_DEV_INITRD
 251         ROOT_DEV = Root_RAM0;
 252
 253         if (LOADER_TYPE && INITRD_START) {
 254                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 255                         reserve_bootmem(INITRD_START + __MEMORY_START,
 256                                         INITRD_SIZE, BOOTMEM_DEFAULT);
 257                         initrd_start = INITRD_START + PAGE_OFFSET +
 258                                         __MEMORY_START;
 259                         initrd_end = initrd_start + INITRD_SIZE;
 260                 } else {
 261                         printk("initrd extends beyond end of memory "
 262                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 263                                     INITRD_START + INITRD_SIZE,
 264                                     max_low_pfn << PAGE_SHIFT);
 265                         initrd_start = 0;
 266                 }
 267         }
 268 #endif
 269
 270         reserve_crashkernel();
 271 }
 272
 273 #ifndef CONFIG_NEED_MULTIPLE_NODES
 274 static void __init setup_memory(void)
 275 {
 276         unsigned long start_pfn;
 277
 278         /*
 279          * Partially used pages are not usable - thus
 280          * we are rounding upwards:
 281          */
 282         start_pfn = PFN_UP(__pa(_end));
 283         setup_bootmem_allocator(start_pfn);
 284 }
 285 #else
 286 extern void __init setup_memory(void);
 287 #endif
 288
 289 void __init setup_arch(char **cmdline_p)
 290 {
 291         enable_mmu();
 292
 293         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 294
 295 #ifdef CONFIG_BLK_DEV_RAM
 296         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 297         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 298         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 299 #endif
 300
 301         if (!MOUNT_ROOT_RDONLY)
 302                 root_mountflags &= ~MS_RDONLY;
 303         init_mm.start_code = (unsigned long) _text;
 304         init_mm.end_code = (unsigned long) _etext;
 305         init_mm.end_data = (unsigned long) _edata;
 306         init_mm.brk = (unsigned long) _end;
 307
 308         code_resource.start = virt_to_phys(_text);
 309         code_resource.end = virt_to_phys(_etext)-1;
 310         data_resource.start = virt_to_phys(_etext);
 311         data_resource.end = virt_to_phys(_edata)-1;
 312         bss_resource.start = virt_to_phys(__bss_start);
 313         bss_resource.end = virt_to_phys(_ebss)-1;
 314
 315         memory_start = (unsigned long)__va(__MEMORY_START);
 316         if (!memory_end)
 317                 memory_end = memory_start + __MEMORY_SIZE;
 318
 319 #ifdef CONFIG_CMDLINE_BOOL
 320         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 321 #else
 322         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 323 #endif
 324
 325         /* Save unparsed command line copy for /proc/cmdline */
 326         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 327         *cmdline_p = command_line;
 328
 329         parse_early_param();
 330
 331         sh_mv_setup();
 332
 333         /*
 334          * Find the highest page frame number we have available
 335          */
 336         max_pfn = PFN_DOWN(__pa(memory_end));
 337
 338         /*
 339          * Determine low and high memory ranges:
 340          */
 341         max_low_pfn = max_pfn;
 342         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 343
 344         nodes_clear(node_online_map);
 345
 346         /* Setup bootmem with available RAM */
 347         setup_memory();
 348         sparse_init();
 349
 350 #ifdef CONFIG_DUMMY_CONSOLE
 351         conswitchp = &dummy_con;
 352 #endif
 353
 354         /* Perform the machine specific initialisation */
 355         if (likely(sh_mv.mv_setup))
 356                 sh_mv.mv_setup(cmdline_p);
 357
 358         paging_init();
 359
 360 #ifdef CONFIG_SMP
 361         plat_smp_setup();
 362 #endif
 363 }
 364
 365 static const char *cpu_name[] = {
 366         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 367         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 368         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 369         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 370         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 371         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 372         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 373         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 374         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 375         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 376         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 377         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 378         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 379         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 380         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 381         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 382         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 383         [CPU_SH7366]    = "SH7366",     [CPU_SH_NONE]   = "Unknown"
 384 };
 385
 386 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 387 {
 388         return cpu_name[c->type];
 389 }
 390
 391 #ifdef CONFIG_PROC_FS
 392 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 393 static const char *cpu_flags[] = {
 394         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 395         "ptea", "llsc", "l2", "op32", NULL
 396 };
 397
 398 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 399 {
 400         unsigned long i;
 401
 402         seq_printf(m, "cpu flags\t:");
 403
 404         if (!c->flags) {
 405                 seq_printf(m, " %s\n", cpu_flags[0]);
 406                 return;
 407         }
 408
 409         for (i = 0; cpu_flags[i]; i++)
 410                 if ((c->flags & (1 << i)))
 411                         seq_printf(m, " %s", cpu_flags[i+1]);
 412
 413         seq_printf(m, "\n");
 414 }
 415
 416 static void show_cacheinfo(struct seq_file *m, const char *type,
 417                            struct cache_info info)
 418 {
 419         unsigned int cache_size;
 420
 421         cache_size = info.ways * info.sets * info.linesz;
 422
 423         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 424                    type, cache_size >> 10, info.ways);
 425 }
 426
 427 /*
 428  *      Get CPU information for use by the procfs.
 429  */
 430 static int show_cpuinfo(struct seq_file *m, void *v)
 431 {
 432         struct sh_cpuinfo *c = v;
 433         unsigned int cpu = c - cpu_data;
 434
 435         if (!cpu_online(cpu))
 436                 return 0;
 437
 438         if (cpu == 0)
 439                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 440
 441         seq_printf(m, "processor\t: %d\n", cpu);
 442         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 443         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 444
 445         show_cpuflags(m, c);
 446
 447         seq_printf(m, "cache type\t: ");
 448
 449         /*
 450          * Check for what type of cache we have, we support both the
 451          * unified cache on the SH-2 and SH-3, as well as the harvard
 452          * style cache on the SH-4.
 453          */
 454         if (c->icache.flags & SH_CACHE_COMBINED) {
 455                 seq_printf(m, "unified\n");
 456                 show_cacheinfo(m, "cache", c->icache);
 457         } else {
 458                 seq_printf(m, "split (harvard)\n");
 459                 show_cacheinfo(m, "icache", c->icache);
 460                 show_cacheinfo(m, "dcache", c->dcache);
 461         }
 462
 463         /* Optional secondary cache */
 464         if (c->flags & CPU_HAS_L2_CACHE)
 465                 show_cacheinfo(m, "scache", c->scache);
 466
 467         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 468                      c->loops_per_jiffy/(500000/HZ),
 469                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 470
 471         return 0;
 472 }
 473
 474 static void *c_start(struct seq_file *m, loff_t *pos)
 475 {
 476         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 477 }
 478 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 479 {
 480         ++*pos;
 481         return c_start(m, pos);
 482 }
 483 static void c_stop(struct seq_file *m, void *v)
 484 {
 485 }
 486 const struct seq_operations cpuinfo_op = {
 487         .start  = c_start,
 488         .next   = c_next,
 489         .stop   = c_stop,
 490         .show   = show_cpuinfo,
 491 };
 492 #endif /* CONFIG_PROC_FS */
 493
 494 struct dentry *sh_debugfs_root;
 495
 496 static int __init sh_debugfs_init(void)
 497 {
 498         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 499         if (IS_ERR(sh_debugfs_root))
 500                 return PTR_ERR(sh_debugfs_root);
 501
 502         return 0;
 503 }
 504 arch_initcall(sh_debugfs_init);