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 <asm/uaccess.h>
  27 #include <asm/io.h>
  28 #include <asm/page.h>
  29 #include <asm/sections.h>
  30 #include <asm/irq.h>
  31 #include <asm/setup.h>
  32 #include <asm/clock.h>
  33 #include <asm/mmu_context.h>
  34
  35 extern void * __rd_start, * __rd_end;
  36
  37 /*
  38  * Machine setup..
  39  */
  40
  41 /*
  42  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  43  * This value will be used at the very early stage of serial setup.
  44  * The bigger value means no problem.
  45  */
  46 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  47         [0] = {
  48                 .type                   = CPU_SH_NONE,
  49                 .loops_per_jiffy        = 10000000,
  50         },
  51 };
  52 EXPORT_SYMBOL(cpu_data);
  53
  54 /*
  55  * The machine vector. First entry in .machvec.init, or clobbered by
  56  * sh_mv= on the command line, prior to .machvec.init teardown.
  57  */
  58 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  59
  60 #ifdef CONFIG_VT
  61 struct screen_info screen_info;
  62 #endif
  63
  64 extern int root_mountflags;
  65
  66 /*
  67  * This is set up by the setup-routine at boot-time
  68  */
  69 #define PARAM   ((unsigned char *)empty_zero_page)
  70
  71 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  72 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  73 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  74 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  75 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  76 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  77 /* ... */
  78 #define COMMAND_LINE ((char *) (PARAM+0x100))
  79
  80 #define RAMDISK_IMAGE_START_MASK        0x07FF
  81 #define RAMDISK_PROMPT_FLAG             0x8000
  82 #define RAMDISK_LOAD_FLAG               0x4000
  83
  84 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  85
  86 static struct resource code_resource = { .name = "Kernel code", };
  87 static struct resource data_resource = { .name = "Kernel data", };
  88
  89 unsigned long memory_start;
  90 EXPORT_SYMBOL(memory_start);
  91
  92 unsigned long memory_end;
  93 EXPORT_SYMBOL(memory_end);
  94
  95 static int __init early_parse_mem(char *p)
  96 {
  97         unsigned long size;
  98
  99         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 100         size = memparse(p, &p);
 101         memory_end = memory_start + size;
 102
 103         return 0;
 104 }
 105 early_param("mem", early_parse_mem);
 106
 107 /*
 108  * Register fully available low RAM pages with the bootmem allocator.
 109  */
 110 static void __init register_bootmem_low_pages(void)
 111 {
 112         unsigned long curr_pfn, last_pfn, pages;
 113
 114         /*
 115          * We are rounding up the start address of usable memory:
 116          */
 117         curr_pfn = PFN_UP(__MEMORY_START);
 118
 119         /*
 120          * ... and at the end of the usable range downwards:
 121          */
 122         last_pfn = PFN_DOWN(__pa(memory_end));
 123
 124         if (last_pfn > max_low_pfn)
 125                 last_pfn = max_low_pfn;
 126
 127         pages = last_pfn - curr_pfn;
 128         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 129 }
 130
 131 #ifdef CONFIG_KEXEC
 132 static void __init reserve_crashkernel(void)
 133 {
 134         unsigned long long free_mem;
 135         unsigned long long crash_size, crash_base;
 136         int ret;
 137
 138         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 139
 140         ret = parse_crashkernel(boot_command_line, free_mem,
 141                         &crash_size, &crash_base);
 142         if (ret == 0 && crash_size) {
 143                 if (crash_base > 0) {
 144                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 145                                         "for crashkernel (System RAM: %ldMB)\n",
 146                                         (unsigned long)(crash_size >> 20),
 147                                         (unsigned long)(crash_base >> 20),
 148                                         (unsigned long)(free_mem >> 20));
 149                         crashk_res.start = crash_base;
 150                         crashk_res.end   = crash_base + crash_size - 1;
 151                         reserve_bootmem(crash_base, crash_size);
 152                 } else
 153                         printk(KERN_INFO "crashkernel reservation failed - "
 154                                         "you have to specify a base address\n");
 155         }
 156 }
 157 #else
 158 static inline void __init reserve_crashkernel(void)
 159 {}
 160 #endif
 161
 162 void __init setup_bootmem_allocator(unsigned long free_pfn)
 163 {
 164         unsigned long bootmap_size;
 165
 166         /*
 167          * Find a proper area for the bootmem bitmap. After this
 168          * bootstrap step all allocations (until the page allocator
 169          * is intact) must be done via bootmem_alloc().
 170          */
 171         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 172                                          min_low_pfn, max_low_pfn);
 173
 174         add_active_range(0, min_low_pfn, max_low_pfn);
 175         register_bootmem_low_pages();
 176
 177         node_set_online(0);
 178
 179         /*
 180          * Reserve the kernel text and
 181          * Reserve the bootmem bitmap. We do this in two steps (first step
 182          * was init_bootmem()), because this catches the (definitely buggy)
 183          * case of us accidentally initializing the bootmem allocator with
 184          * an invalid RAM area.
 185          */
 186         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 187                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 188
 189         /*
 190          * reserve physical page 0 - it's a special BIOS page on many boxes,
 191          * enabling clean reboots, SMP operation, laptop functions.
 192          */
 193         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 194
 195         sparse_memory_present_with_active_regions(0);
 196
 197 #ifdef CONFIG_BLK_DEV_INITRD
 198         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 199         if (&__rd_start != &__rd_end) {
 200                 LOADER_TYPE = 1;
 201                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 202                                         __MEMORY_START;
 203                 INITRD_SIZE = (unsigned long)&__rd_end -
 204                               (unsigned long)&__rd_start;
 205         }
 206
 207         if (LOADER_TYPE && INITRD_START) {
 208                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 209                         reserve_bootmem(INITRD_START + __MEMORY_START,
 210                                         INITRD_SIZE);
 211                         initrd_start = INITRD_START + PAGE_OFFSET +
 212                                         __MEMORY_START;
 213                         initrd_end = initrd_start + INITRD_SIZE;
 214                 } else {
 215                         printk("initrd extends beyond end of memory "
 216                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 217                                     INITRD_START + INITRD_SIZE,
 218                                     max_low_pfn << PAGE_SHIFT);
 219                         initrd_start = 0;
 220                 }
 221         }
 222 #endif
 223
 224         reserve_crashkernel();
 225 }
 226
 227 #ifndef CONFIG_NEED_MULTIPLE_NODES
 228 static void __init setup_memory(void)
 229 {
 230         unsigned long start_pfn;
 231
 232         /*
 233          * Partially used pages are not usable - thus
 234          * we are rounding upwards:
 235          */
 236         start_pfn = PFN_UP(__pa(_end));
 237         setup_bootmem_allocator(start_pfn);
 238 }
 239 #else
 240 extern void __init setup_memory(void);
 241 #endif
 242
 243 void __init setup_arch(char **cmdline_p)
 244 {
 245         enable_mmu();
 246
 247         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 248
 249 #ifdef CONFIG_BLK_DEV_RAM
 250         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 251         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 252         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 253 #endif
 254
 255         if (!MOUNT_ROOT_RDONLY)
 256                 root_mountflags &= ~MS_RDONLY;
 257         init_mm.start_code = (unsigned long) _text;
 258         init_mm.end_code = (unsigned long) _etext;
 259         init_mm.end_data = (unsigned long) _edata;
 260         init_mm.brk = (unsigned long) _end;
 261
 262         code_resource.start = virt_to_phys(_text);
 263         code_resource.end = virt_to_phys(_etext)-1;
 264         data_resource.start = virt_to_phys(_etext);
 265         data_resource.end = virt_to_phys(_edata)-1;
 266
 267         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 268         memory_end = memory_start + __MEMORY_SIZE;
 269
 270 #ifdef CONFIG_CMDLINE_BOOL
 271         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 272 #else
 273         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 274 #endif
 275
 276         /* Save unparsed command line copy for /proc/cmdline */
 277         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 278         *cmdline_p = command_line;
 279
 280         parse_early_param();
 281
 282         sh_mv_setup();
 283
 284         /*
 285          * Find the highest page frame number we have available
 286          */
 287         max_pfn = PFN_DOWN(__pa(memory_end));
 288
 289         /*
 290          * Determine low and high memory ranges:
 291          */
 292         max_low_pfn = max_pfn;
 293         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 294
 295         nodes_clear(node_online_map);
 296
 297         /* Setup bootmem with available RAM */
 298         setup_memory();
 299         sparse_init();
 300
 301 #ifdef CONFIG_DUMMY_CONSOLE
 302         conswitchp = &dummy_con;
 303 #endif
 304
 305         /* Perform the machine specific initialisation */
 306         if (likely(sh_mv.mv_setup))
 307                 sh_mv.mv_setup(cmdline_p);
 308
 309         paging_init();
 310
 311 #ifdef CONFIG_SMP
 312         plat_smp_setup();
 313 #endif
 314 }
 315
 316 static const char *cpu_name[] = {
 317         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 318         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 319         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 320         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 321         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 322         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 323         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 324         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 325         [CPU_SH7760]    = "SH7760",
 326         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 327         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 328         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 329         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 330         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 331         [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
 332 };
 333
 334 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 335 {
 336         return cpu_name[c->type];
 337 }
 338
 339 #ifdef CONFIG_PROC_FS
 340 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 341 static const char *cpu_flags[] = {
 342         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 343         "ptea", "llsc", "l2", "op32", NULL
 344 };
 345
 346 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 347 {
 348         unsigned long i;
 349
 350         seq_printf(m, "cpu flags\t:");
 351
 352         if (!c->flags) {
 353                 seq_printf(m, " %s\n", cpu_flags[0]);
 354                 return;
 355         }
 356
 357         for (i = 0; cpu_flags[i]; i++)
 358                 if ((c->flags & (1 << i)))
 359                         seq_printf(m, " %s", cpu_flags[i+1]);
 360
 361         seq_printf(m, "\n");
 362 }
 363
 364 static void show_cacheinfo(struct seq_file *m, const char *type,
 365                            struct cache_info info)
 366 {
 367         unsigned int cache_size;
 368
 369         cache_size = info.ways * info.sets * info.linesz;
 370
 371         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 372                    type, cache_size >> 10, info.ways);
 373 }
 374
 375 /*
 376  *      Get CPU information for use by the procfs.
 377  */
 378 static int show_cpuinfo(struct seq_file *m, void *v)
 379 {
 380         struct sh_cpuinfo *c = v;
 381         unsigned int cpu = c - cpu_data;
 382
 383         if (!cpu_online(cpu))
 384                 return 0;
 385
 386         if (cpu == 0)
 387                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 388
 389         seq_printf(m, "processor\t: %d\n", cpu);
 390         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 391         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 392
 393         show_cpuflags(m, c);
 394
 395         seq_printf(m, "cache type\t: ");
 396
 397         /*
 398          * Check for what type of cache we have, we support both the
 399          * unified cache on the SH-2 and SH-3, as well as the harvard
 400          * style cache on the SH-4.
 401          */
 402         if (c->icache.flags & SH_CACHE_COMBINED) {
 403                 seq_printf(m, "unified\n");
 404                 show_cacheinfo(m, "cache", c->icache);
 405         } else {
 406                 seq_printf(m, "split (harvard)\n");
 407                 show_cacheinfo(m, "icache", c->icache);
 408                 show_cacheinfo(m, "dcache", c->dcache);
 409         }
 410
 411         /* Optional secondary cache */
 412         if (c->flags & CPU_HAS_L2_CACHE)
 413                 show_cacheinfo(m, "scache", c->scache);
 414
 415         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 416                      c->loops_per_jiffy/(500000/HZ),
 417                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 418
 419         return 0;
 420 }
 421
 422 static void *c_start(struct seq_file *m, loff_t *pos)
 423 {
 424         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 425 }
 426 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 427 {
 428         ++*pos;
 429         return c_start(m, pos);
 430 }
 431 static void c_stop(struct seq_file *m, void *v)
 432 {
 433 }
 434 struct seq_operations cpuinfo_op = {
 435         .start  = c_start,
 436         .next   = c_next,
 437         .stop   = c_stop,
 438         .show   = show_cpuinfo,
 439 };
 440 #endif /* CONFIG_PROC_FS */