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 /*
  36  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  37  * This value will be used at the very early stage of serial setup.
  38  * The bigger value means no problem.
  39  */
  40 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  41         [0] = {
  42                 .type                   = CPU_SH_NONE,
  43                 .loops_per_jiffy        = 10000000,
  44         },
  45 };
  46 EXPORT_SYMBOL(cpu_data);
  47
  48 /*
  49  * The machine vector. First entry in .machvec.init, or clobbered by
  50  * sh_mv= on the command line, prior to .machvec.init teardown.
  51  */
  52 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  53
  54 #ifdef CONFIG_VT
  55 struct screen_info screen_info;
  56 #endif
  57
  58 extern int root_mountflags;
  59
  60 #define RAMDISK_IMAGE_START_MASK        0x07FF
  61 #define RAMDISK_PROMPT_FLAG             0x8000
  62 #define RAMDISK_LOAD_FLAG               0x4000
  63
  64 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  65
  66 static struct resource code_resource = {
  67         .name = "Kernel code",
  68         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  69 };
  70
  71 static struct resource data_resource = {
  72         .name = "Kernel data",
  73         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  74 };
  75
  76 unsigned long memory_start;
  77 EXPORT_SYMBOL(memory_start);
  78 unsigned long memory_end = 0;
  79 EXPORT_SYMBOL(memory_end);
  80
  81 static int __init early_parse_mem(char *p)
  82 {
  83         unsigned long size;
  84
  85         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  86         size = memparse(p, &p);
  87         memory_end = memory_start + size;
  88
  89         return 0;
  90 }
  91 early_param("mem", early_parse_mem);
  92
  93 /*
  94  * Register fully available low RAM pages with the bootmem allocator.
  95  */
  96 static void __init register_bootmem_low_pages(void)
  97 {
  98         unsigned long curr_pfn, last_pfn, pages;
  99
 100         /*
 101          * We are rounding up the start address of usable memory:
 102          */
 103         curr_pfn = PFN_UP(__MEMORY_START);
 104
 105         /*
 106          * ... and at the end of the usable range downwards:
 107          */
 108         last_pfn = PFN_DOWN(__pa(memory_end));
 109
 110         if (last_pfn > max_low_pfn)
 111                 last_pfn = max_low_pfn;
 112
 113         pages = last_pfn - curr_pfn;
 114         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 115 }
 116
 117 #ifdef CONFIG_KEXEC
 118 static void __init reserve_crashkernel(void)
 119 {
 120         unsigned long long free_mem;
 121         unsigned long long crash_size, crash_base;
 122         int ret;
 123
 124         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 125
 126         ret = parse_crashkernel(boot_command_line, free_mem,
 127                         &crash_size, &crash_base);
 128         if (ret == 0 && crash_size) {
 129                 if (crash_base > 0) {
 130                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 131                                         "for crashkernel (System RAM: %ldMB)\n",
 132                                         (unsigned long)(crash_size >> 20),
 133                                         (unsigned long)(crash_base >> 20),
 134                                         (unsigned long)(free_mem >> 20));
 135                         crashk_res.start = crash_base;
 136                         crashk_res.end   = crash_base + crash_size - 1;
 137                         reserve_bootmem(crash_base, crash_size);
 138                 } else
 139                         printk(KERN_INFO "crashkernel reservation failed - "
 140                                         "you have to specify a base address\n");
 141         }
 142 }
 143 #else
 144 static inline void __init reserve_crashkernel(void)
 145 {}
 146 #endif
 147
 148 void __init setup_bootmem_allocator(unsigned long free_pfn)
 149 {
 150         unsigned long bootmap_size;
 151
 152         /*
 153          * Find a proper area for the bootmem bitmap. After this
 154          * bootstrap step all allocations (until the page allocator
 155          * is intact) must be done via bootmem_alloc().
 156          */
 157         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 158                                          min_low_pfn, max_low_pfn);
 159
 160         add_active_range(0, min_low_pfn, max_low_pfn);
 161         register_bootmem_low_pages();
 162
 163         node_set_online(0);
 164
 165         /*
 166          * Reserve the kernel text and
 167          * Reserve the bootmem bitmap. We do this in two steps (first step
 168          * was init_bootmem()), because this catches the (definitely buggy)
 169          * case of us accidentally initializing the bootmem allocator with
 170          * an invalid RAM area.
 171          */
 172         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 173                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 174
 175         /*
 176          * reserve physical page 0 - it's a special BIOS page on many boxes,
 177          * enabling clean reboots, SMP operation, laptop functions.
 178          */
 179         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 180
 181         sparse_memory_present_with_active_regions(0);
 182
 183 #ifdef CONFIG_BLK_DEV_INITRD
 184         ROOT_DEV = Root_RAM0;
 185
 186         if (LOADER_TYPE && INITRD_START) {
 187                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 188                         reserve_bootmem(INITRD_START + __MEMORY_START,
 189                                         INITRD_SIZE);
 190                         initrd_start = INITRD_START + PAGE_OFFSET +
 191                                         __MEMORY_START;
 192                         initrd_end = initrd_start + INITRD_SIZE;
 193                 } else {
 194                         printk("initrd extends beyond end of memory "
 195                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 196                                     INITRD_START + INITRD_SIZE,
 197                                     max_low_pfn << PAGE_SHIFT);
 198                         initrd_start = 0;
 199                 }
 200         }
 201 #endif
 202
 203         reserve_crashkernel();
 204 }
 205
 206 #ifndef CONFIG_NEED_MULTIPLE_NODES
 207 static void __init setup_memory(void)
 208 {
 209         unsigned long start_pfn;
 210
 211         /*
 212          * Partially used pages are not usable - thus
 213          * we are rounding upwards:
 214          */
 215         start_pfn = PFN_UP(__pa(_end));
 216         setup_bootmem_allocator(start_pfn);
 217 }
 218 #else
 219 extern void __init setup_memory(void);
 220 #endif
 221
 222 void __init setup_arch(char **cmdline_p)
 223 {
 224         enable_mmu();
 225
 226         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 227
 228 #ifdef CONFIG_BLK_DEV_RAM
 229         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 230         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 231         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 232 #endif
 233
 234         if (!MOUNT_ROOT_RDONLY)
 235                 root_mountflags &= ~MS_RDONLY;
 236         init_mm.start_code = (unsigned long) _text;
 237         init_mm.end_code = (unsigned long) _etext;
 238         init_mm.end_data = (unsigned long) _edata;
 239         init_mm.brk = (unsigned long) _end;
 240
 241         code_resource.start = virt_to_phys(_text);
 242         code_resource.end = virt_to_phys(_etext)-1;
 243         data_resource.start = virt_to_phys(_etext);
 244         data_resource.end = virt_to_phys(_edata)-1;
 245
 246         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 247         if (!memory_end)
 248                 memory_end = memory_start + __MEMORY_SIZE;
 249
 250 #ifdef CONFIG_CMDLINE_BOOL
 251         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 252 #else
 253         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 254 #endif
 255
 256         /* Save unparsed command line copy for /proc/cmdline */
 257         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 258         *cmdline_p = command_line;
 259
 260         parse_early_param();
 261
 262         sh_mv_setup();
 263
 264         /*
 265          * Find the highest page frame number we have available
 266          */
 267         max_pfn = PFN_DOWN(__pa(memory_end));
 268
 269         /*
 270          * Determine low and high memory ranges:
 271          */
 272         max_low_pfn = max_pfn;
 273         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 274
 275         nodes_clear(node_online_map);
 276
 277         /* Setup bootmem with available RAM */
 278         setup_memory();
 279         sparse_init();
 280
 281 #ifdef CONFIG_DUMMY_CONSOLE
 282         conswitchp = &dummy_con;
 283 #endif
 284
 285         /* Perform the machine specific initialisation */
 286         if (likely(sh_mv.mv_setup))
 287                 sh_mv.mv_setup(cmdline_p);
 288
 289         paging_init();
 290
 291 #ifdef CONFIG_SMP
 292         plat_smp_setup();
 293 #endif
 294 }
 295
 296 static const char *cpu_name[] = {
 297         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 298         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 299         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 300         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 301         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 302         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 303         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 304         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 305         [CPU_SH7760]    = "SH7760",
 306         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 307         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 308         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 309         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 310         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 311         [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
 312 };
 313
 314 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 315 {
 316         return cpu_name[c->type];
 317 }
 318
 319 #ifdef CONFIG_PROC_FS
 320 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 321 static const char *cpu_flags[] = {
 322         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 323         "ptea", "llsc", "l2", "op32", NULL
 324 };
 325
 326 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 327 {
 328         unsigned long i;
 329
 330         seq_printf(m, "cpu flags\t:");
 331
 332         if (!c->flags) {
 333                 seq_printf(m, " %s\n", cpu_flags[0]);
 334                 return;
 335         }
 336
 337         for (i = 0; cpu_flags[i]; i++)
 338                 if ((c->flags & (1 << i)))
 339                         seq_printf(m, " %s", cpu_flags[i+1]);
 340
 341         seq_printf(m, "\n");
 342 }
 343
 344 static void show_cacheinfo(struct seq_file *m, const char *type,
 345                            struct cache_info info)
 346 {
 347         unsigned int cache_size;
 348
 349         cache_size = info.ways * info.sets * info.linesz;
 350
 351         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 352                    type, cache_size >> 10, info.ways);
 353 }
 354
 355 /*
 356  *      Get CPU information for use by the procfs.
 357  */
 358 static int show_cpuinfo(struct seq_file *m, void *v)
 359 {
 360         struct sh_cpuinfo *c = v;
 361         unsigned int cpu = c - cpu_data;
 362
 363         if (!cpu_online(cpu))
 364                 return 0;
 365
 366         if (cpu == 0)
 367                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 368
 369         seq_printf(m, "processor\t: %d\n", cpu);
 370         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 371         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 372
 373         show_cpuflags(m, c);
 374
 375         seq_printf(m, "cache type\t: ");
 376
 377         /*
 378          * Check for what type of cache we have, we support both the
 379          * unified cache on the SH-2 and SH-3, as well as the harvard
 380          * style cache on the SH-4.
 381          */
 382         if (c->icache.flags & SH_CACHE_COMBINED) {
 383                 seq_printf(m, "unified\n");
 384                 show_cacheinfo(m, "cache", c->icache);
 385         } else {
 386                 seq_printf(m, "split (harvard)\n");
 387                 show_cacheinfo(m, "icache", c->icache);
 388                 show_cacheinfo(m, "dcache", c->dcache);
 389         }
 390
 391         /* Optional secondary cache */
 392         if (c->flags & CPU_HAS_L2_CACHE)
 393                 show_cacheinfo(m, "scache", c->scache);
 394
 395         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 396                      c->loops_per_jiffy/(500000/HZ),
 397                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 398
 399         return 0;
 400 }
 401
 402 static void *c_start(struct seq_file *m, loff_t *pos)
 403 {
 404         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 405 }
 406 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 407 {
 408         ++*pos;
 409         return c_start(m, pos);
 410 }
 411 static void c_stop(struct seq_file *m, void *v)
 412 {
 413 }
 414 struct seq_operations cpuinfo_op = {
 415         .start  = c_start,
 416         .next   = c_next,
 417         .stop   = c_stop,
 418         .show   = show_cpuinfo,
 419 };
 420 #endif /* CONFIG_PROC_FS */