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