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   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 void __init setup_bootmem_allocator(unsigned long free_pfn)
 132 {
 133         unsigned long bootmap_size;
 134
 135         /*
 136          * Find a proper area for the bootmem bitmap. After this
 137          * bootstrap step all allocations (until the page allocator
 138          * is intact) must be done via bootmem_alloc().
 139          */
 140         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 141                                          min_low_pfn, max_low_pfn);
 142
 143         add_active_range(0, min_low_pfn, max_low_pfn);
 144         register_bootmem_low_pages();
 145
 146         node_set_online(0);
 147
 148         /*
 149          * Reserve the kernel text and
 150          * Reserve the bootmem bitmap. We do this in two steps (first step
 151          * was init_bootmem()), because this catches the (definitely buggy)
 152          * case of us accidentally initializing the bootmem allocator with
 153          * an invalid RAM area.
 154          */
 155         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 156                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 157
 158         /*
 159          * reserve physical page 0 - it's a special BIOS page on many boxes,
 160          * enabling clean reboots, SMP operation, laptop functions.
 161          */
 162         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 163
 164         sparse_memory_present_with_active_regions(0);
 165
 166 #ifdef CONFIG_BLK_DEV_INITRD
 167         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 168         if (&__rd_start != &__rd_end) {
 169                 LOADER_TYPE = 1;
 170                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 171                                         __MEMORY_START;
 172                 INITRD_SIZE = (unsigned long)&__rd_end -
 173                               (unsigned long)&__rd_start;
 174         }
 175
 176         if (LOADER_TYPE && INITRD_START) {
 177                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 178                         reserve_bootmem(INITRD_START + __MEMORY_START,
 179                                         INITRD_SIZE);
 180                         initrd_start = INITRD_START + PAGE_OFFSET +
 181                                         __MEMORY_START;
 182                         initrd_end = initrd_start + INITRD_SIZE;
 183                 } else {
 184                         printk("initrd extends beyond end of memory "
 185                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 186                                     INITRD_START + INITRD_SIZE,
 187                                     max_low_pfn << PAGE_SHIFT);
 188                         initrd_start = 0;
 189                 }
 190         }
 191 #endif
 192 #ifdef CONFIG_KEXEC
 193         if (crashk_res.start != crashk_res.end)
 194                 reserve_bootmem(crashk_res.start,
 195                         crashk_res.end - crashk_res.start + 1);
 196 #endif
 197 }
 198
 199 #ifndef CONFIG_NEED_MULTIPLE_NODES
 200 static void __init setup_memory(void)
 201 {
 202         unsigned long start_pfn;
 203
 204         /*
 205          * Partially used pages are not usable - thus
 206          * we are rounding upwards:
 207          */
 208         start_pfn = PFN_UP(__pa(_end));
 209         setup_bootmem_allocator(start_pfn);
 210 }
 211 #else
 212 extern void __init setup_memory(void);
 213 #endif
 214
 215 void __init setup_arch(char **cmdline_p)
 216 {
 217         enable_mmu();
 218
 219         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 220
 221 #ifdef CONFIG_BLK_DEV_RAM
 222         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 223         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 224         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 225 #endif
 226
 227         if (!MOUNT_ROOT_RDONLY)
 228                 root_mountflags &= ~MS_RDONLY;
 229         init_mm.start_code = (unsigned long) _text;
 230         init_mm.end_code = (unsigned long) _etext;
 231         init_mm.end_data = (unsigned long) _edata;
 232         init_mm.brk = (unsigned long) _end;
 233
 234         code_resource.start = virt_to_phys(_text);
 235         code_resource.end = virt_to_phys(_etext)-1;
 236         data_resource.start = virt_to_phys(_etext);
 237         data_resource.end = virt_to_phys(_edata)-1;
 238
 239         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 240         memory_end = memory_start + __MEMORY_SIZE;
 241
 242 #ifdef CONFIG_CMDLINE_BOOL
 243         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 244 #else
 245         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 246 #endif
 247
 248         /* Save unparsed command line copy for /proc/cmdline */
 249         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 250         *cmdline_p = command_line;
 251
 252         parse_early_param();
 253
 254         sh_mv_setup();
 255
 256         /*
 257          * Find the highest page frame number we have available
 258          */
 259         max_pfn = PFN_DOWN(__pa(memory_end));
 260
 261         /*
 262          * Determine low and high memory ranges:
 263          */
 264         max_low_pfn = max_pfn;
 265         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 266
 267         nodes_clear(node_online_map);
 268
 269         /* Setup bootmem with available RAM */
 270         setup_memory();
 271         sparse_init();
 272
 273 #ifdef CONFIG_DUMMY_CONSOLE
 274         conswitchp = &dummy_con;
 275 #endif
 276
 277         /* Perform the machine specific initialisation */
 278         if (likely(sh_mv.mv_setup))
 279                 sh_mv.mv_setup(cmdline_p);
 280
 281         paging_init();
 282
 283 #ifdef CONFIG_SMP
 284         plat_smp_setup();
 285 #endif
 286 }
 287
 288 static const char *cpu_name[] = {
 289         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 290         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 291         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 292         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 293         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 294         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 295         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 296         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 297         [CPU_SH7760]    = "SH7760",
 298         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 299         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 300         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 301         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 302         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 303         [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
 304 };
 305
 306 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 307 {
 308         return cpu_name[c->type];
 309 }
 310
 311 #ifdef CONFIG_PROC_FS
 312 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 313 static const char *cpu_flags[] = {
 314         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 315         "ptea", "llsc", "l2", "op32", NULL
 316 };
 317
 318 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 319 {
 320         unsigned long i;
 321
 322         seq_printf(m, "cpu flags\t:");
 323
 324         if (!c->flags) {
 325                 seq_printf(m, " %s\n", cpu_flags[0]);
 326                 return;
 327         }
 328
 329         for (i = 0; cpu_flags[i]; i++)
 330                 if ((c->flags & (1 << i)))
 331                         seq_printf(m, " %s", cpu_flags[i+1]);
 332
 333         seq_printf(m, "\n");
 334 }
 335
 336 static void show_cacheinfo(struct seq_file *m, const char *type,
 337                            struct cache_info info)
 338 {
 339         unsigned int cache_size;
 340
 341         cache_size = info.ways * info.sets * info.linesz;
 342
 343         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 344                    type, cache_size >> 10, info.ways);
 345 }
 346
 347 /*
 348  *      Get CPU information for use by the procfs.
 349  */
 350 static int show_cpuinfo(struct seq_file *m, void *v)
 351 {
 352         struct sh_cpuinfo *c = v;
 353         unsigned int cpu = c - cpu_data;
 354
 355         if (!cpu_online(cpu))
 356                 return 0;
 357
 358         if (cpu == 0)
 359                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 360
 361         seq_printf(m, "processor\t: %d\n", cpu);
 362         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 363         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 364
 365         show_cpuflags(m, c);
 366
 367         seq_printf(m, "cache type\t: ");
 368
 369         /*
 370          * Check for what type of cache we have, we support both the
 371          * unified cache on the SH-2 and SH-3, as well as the harvard
 372          * style cache on the SH-4.
 373          */
 374         if (c->icache.flags & SH_CACHE_COMBINED) {
 375                 seq_printf(m, "unified\n");
 376                 show_cacheinfo(m, "cache", c->icache);
 377         } else {
 378                 seq_printf(m, "split (harvard)\n");
 379                 show_cacheinfo(m, "icache", c->icache);
 380                 show_cacheinfo(m, "dcache", c->dcache);
 381         }
 382
 383         /* Optional secondary cache */
 384         if (c->flags & CPU_HAS_L2_CACHE)
 385                 show_cacheinfo(m, "scache", c->scache);
 386
 387         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 388                      c->loops_per_jiffy/(500000/HZ),
 389                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 390
 391         return 0;
 392 }
 393
 394 static void *c_start(struct seq_file *m, loff_t *pos)
 395 {
 396         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 397 }
 398 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 399 {
 400         ++*pos;
 401         return c_start(m, pos);
 402 }
 403 static void c_stop(struct seq_file *m, void *v)
 404 {
 405 }
 406 struct seq_operations cpuinfo_op = {
 407         .start  = c_start,
 408         .next   = c_next,
 409         .stop   = c_stop,
 410         .show   = show_cpuinfo,
 411 };
 412 #endif /* CONFIG_PROC_FS */