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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 <linux/err.h>
  27 #include <linux/debugfs.h>
  28 #include <linux/crash_dump.h>
  29 #include <linux/mmzone.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/io.h>
  32 #include <asm/page.h>
  33 #include <asm/elf.h>
  34 #include <asm/sections.h>
  35 #include <asm/irq.h>
  36 #include <asm/setup.h>
  37 #include <asm/clock.h>
  38 #include <asm/mmu_context.h>
  39
  40 /*
  41  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  42  * This value will be used at the very early stage of serial setup.
  43  * The bigger value means no problem.
  44  */
  45 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  46         [0] = {
  47                 .type                   = CPU_SH_NONE,
  48                 .loops_per_jiffy        = 10000000,
  49         },
  50 };
  51 EXPORT_SYMBOL(cpu_data);
  52
  53 /*
  54  * The machine vector. First entry in .machvec.init, or clobbered by
  55  * sh_mv= on the command line, prior to .machvec.init teardown.
  56  */
  57 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  58 EXPORT_SYMBOL(sh_mv);
  59
  60 #ifdef CONFIG_VT
  61 struct screen_info screen_info;
  62 #endif
  63
  64 extern int root_mountflags;
  65
  66 #define RAMDISK_IMAGE_START_MASK        0x07FF
  67 #define RAMDISK_PROMPT_FLAG             0x8000
  68 #define RAMDISK_LOAD_FLAG               0x4000
  69
  70 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  71
  72 static struct resource code_resource = {
  73         .name = "Kernel code",
  74         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  75 };
  76
  77 static struct resource data_resource = {
  78         .name = "Kernel data",
  79         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  80 };
  81
  82 static struct resource bss_resource = {
  83         .name   = "Kernel bss",
  84         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  85 };
  86
  87 unsigned long memory_start;
  88 EXPORT_SYMBOL(memory_start);
  89 unsigned long memory_end = 0;
  90 EXPORT_SYMBOL(memory_end);
  91
  92 static struct resource mem_resources[MAX_NUMNODES];
  93
  94 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
  95
  96 static int __init early_parse_mem(char *p)
  97 {
  98         unsigned long size;
  99
 100         memory_start = (unsigned long)__va(__MEMORY_START);
 101         size = memparse(p, &p);
 102
 103         if (size > __MEMORY_SIZE) {
 104                 static char msg[] __initdata = KERN_ERR
 105                         "Using mem= to increase the size of kernel memory "
 106                         "is not allowed.\n"
 107                         "  Recompile the kernel with the correct value for "
 108                         "CONFIG_MEMORY_SIZE.\n";
 109                 printk(msg);
 110                 return 0;
 111         }
 112
 113         memory_end = memory_start + size;
 114
 115         return 0;
 116 }
 117 early_param("mem", early_parse_mem);
 118
 119 /*
 120  * Register fully available low RAM pages with the bootmem allocator.
 121  */
 122 static void __init register_bootmem_low_pages(void)
 123 {
 124         unsigned long curr_pfn, last_pfn, pages;
 125
 126         /*
 127          * We are rounding up the start address of usable memory:
 128          */
 129         curr_pfn = PFN_UP(__MEMORY_START);
 130
 131         /*
 132          * ... and at the end of the usable range downwards:
 133          */
 134         last_pfn = PFN_DOWN(__pa(memory_end));
 135
 136         if (last_pfn > max_low_pfn)
 137                 last_pfn = max_low_pfn;
 138
 139         pages = last_pfn - curr_pfn;
 140         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 141 }
 142
 143 #ifdef CONFIG_KEXEC
 144 static void __init reserve_crashkernel(void)
 145 {
 146         unsigned long long free_mem;
 147         unsigned long long crash_size, crash_base;
 148         int ret;
 149
 150         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 151
 152         ret = parse_crashkernel(boot_command_line, free_mem,
 153                         &crash_size, &crash_base);
 154         if (ret == 0 && crash_size) {
 155                 if (crash_base <= 0) {
 156                         printk(KERN_INFO "crashkernel reservation failed - "
 157                                         "you have to specify a base address\n");
 158                         return;
 159                 }
 160
 161                 if (reserve_bootmem(crash_base, crash_size,
 162                                         BOOTMEM_EXCLUSIVE) < 0) {
 163                         printk(KERN_INFO "crashkernel reservation failed - "
 164                                         "memory is in use\n");
 165                         return;
 166                 }
 167
 168                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 169                                 "for crashkernel (System RAM: %ldMB)\n",
 170                                 (unsigned long)(crash_size >> 20),
 171                                 (unsigned long)(crash_base >> 20),
 172                                 (unsigned long)(free_mem >> 20));
 173                 crashk_res.start = crash_base;
 174                 crashk_res.end   = crash_base + crash_size - 1;
 175                 insert_resource(&iomem_resource, &crashk_res);
 176         }
 177 }
 178 #else
 179 static inline void __init reserve_crashkernel(void)
 180 {}
 181 #endif
 182
 183 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 184                                                 unsigned long end_pfn)
 185 {
 186         struct resource *res = &mem_resources[nid];
 187
 188         WARN_ON(res->name); /* max one active range per node for now */
 189
 190         res->name = "System RAM";
 191         res->start = start_pfn << PAGE_SHIFT;
 192         res->end = (end_pfn << PAGE_SHIFT) - 1;
 193         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 194         if (request_resource(&iomem_resource, res)) {
 195                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 196                        start_pfn, end_pfn);
 197                 return;
 198         }
 199
 200         /*
 201          *  We don't know which RAM region contains kernel data,
 202          *  so we try it repeatedly and let the resource manager
 203          *  test it.
 204          */
 205         request_resource(res, &code_resource);
 206         request_resource(res, &data_resource);
 207         request_resource(res, &bss_resource);
 208
 209         add_active_range(nid, start_pfn, end_pfn);
 210 }
 211
 212 void __init setup_bootmem_allocator(unsigned long free_pfn)
 213 {
 214         unsigned long bootmap_size;
 215
 216         /*
 217          * Find a proper area for the bootmem bitmap. After this
 218          * bootstrap step all allocations (until the page allocator
 219          * is intact) must be done via bootmem_alloc().
 220          */
 221         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 222                                          min_low_pfn, max_low_pfn);
 223
 224         __add_active_range(0, min_low_pfn, max_low_pfn);
 225         register_bootmem_low_pages();
 226
 227         node_set_online(0);
 228
 229         /*
 230          * Reserve the kernel text and
 231          * Reserve the bootmem bitmap. We do this in two steps (first step
 232          * was init_bootmem()), because this catches the (definitely buggy)
 233          * case of us accidentally initializing the bootmem allocator with
 234          * an invalid RAM area.
 235          */
 236         reserve_bootmem(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 237                         (PFN_PHYS(free_pfn) + bootmap_size + PAGE_SIZE - 1) -
 238                         (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET),
 239                         BOOTMEM_DEFAULT);
 240
 241         /*
 242          * reserve physical page 0 - it's a special BIOS page on many boxes,
 243          * enabling clean reboots, SMP operation, laptop functions.
 244          */
 245         reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
 246                         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                 unsigned long initrd_start_phys = INITRD_START + __MEMORY_START;
 255
 256                 if (initrd_start_phys + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 257                         reserve_bootmem(initrd_start_phys, INITRD_SIZE,
 258                                         BOOTMEM_DEFAULT);
 259                         initrd_start = (unsigned long)__va(initrd_start_phys);
 260                         initrd_end = initrd_start + INITRD_SIZE;
 261                 } else {
 262                         printk("initrd extends beyond end of memory "
 263                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 264                                initrd_start_phys + INITRD_SIZE,
 265                                PFN_PHYS(max_low_pfn));
 266                         initrd_start = 0;
 267                 }
 268         }
 269 #endif
 270
 271         reserve_crashkernel();
 272 }
 273
 274 #ifndef CONFIG_NEED_MULTIPLE_NODES
 275 static void __init setup_memory(void)
 276 {
 277         unsigned long start_pfn;
 278
 279         /*
 280          * Partially used pages are not usable - thus
 281          * we are rounding upwards:
 282          */
 283         start_pfn = PFN_UP(__pa(_end));
 284         setup_bootmem_allocator(start_pfn);
 285 }
 286 #else
 287 extern void __init setup_memory(void);
 288 #endif
 289
 290 /*
 291  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 292  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 293  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 294  */
 295 #ifdef CONFIG_CRASH_DUMP
 296 /* elfcorehdr= specifies the location of elf core header
 297  * stored by the crashed kernel.
 298  */
 299 static int __init parse_elfcorehdr(char *arg)
 300 {
 301         if (!arg)
 302                 return -EINVAL;
 303         elfcorehdr_addr = memparse(arg, &arg);
 304         return 0;
 305 }
 306 early_param("elfcorehdr", parse_elfcorehdr);
 307 #endif
 308
 309 void __init setup_arch(char **cmdline_p)
 310 {
 311         enable_mmu();
 312
 313         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 314
 315         printk(KERN_NOTICE "Boot params:\n"
 316                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 317                            "... RAMDISK_FLAGS     - %08lx\n"
 318                            "... ORIG_ROOT_DEV     - %08lx\n"
 319                            "... LOADER_TYPE       - %08lx\n"
 320                            "... INITRD_START      - %08lx\n"
 321                            "... INITRD_SIZE       - %08lx\n",
 322                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 323                            ORIG_ROOT_DEV, LOADER_TYPE,
 324                            INITRD_START, INITRD_SIZE);
 325
 326 #ifdef CONFIG_BLK_DEV_RAM
 327         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 328         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 329         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 330 #endif
 331
 332         if (!MOUNT_ROOT_RDONLY)
 333                 root_mountflags &= ~MS_RDONLY;
 334         init_mm.start_code = (unsigned long) _text;
 335         init_mm.end_code = (unsigned long) _etext;
 336         init_mm.end_data = (unsigned long) _edata;
 337         init_mm.brk = (unsigned long) _end;
 338
 339         code_resource.start = virt_to_phys(_text);
 340         code_resource.end = virt_to_phys(_etext)-1;
 341         data_resource.start = virt_to_phys(_etext);
 342         data_resource.end = virt_to_phys(_edata)-1;
 343         bss_resource.start = virt_to_phys(__bss_start);
 344         bss_resource.end = virt_to_phys(_ebss)-1;
 345
 346         memory_start = (unsigned long)__va(__MEMORY_START);
 347         if (!memory_end)
 348                 memory_end = memory_start + __MEMORY_SIZE;
 349
 350 #ifdef CONFIG_CMDLINE_BOOL
 351         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 352 #else
 353         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 354 #endif
 355
 356         /* Save unparsed command line copy for /proc/cmdline */
 357         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 358         *cmdline_p = command_line;
 359
 360         parse_early_param();
 361
 362         sh_mv_setup();
 363
 364         /*
 365          * Find the highest page frame number we have available
 366          */
 367         max_pfn = PFN_DOWN(__pa(memory_end));
 368
 369         /*
 370          * Determine low and high memory ranges:
 371          */
 372         max_low_pfn = max_pfn;
 373         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 374
 375         nodes_clear(node_online_map);
 376
 377         /* Setup bootmem with available RAM */
 378         setup_memory();
 379         sparse_init();
 380
 381 #ifdef CONFIG_DUMMY_CONSOLE
 382         conswitchp = &dummy_con;
 383 #endif
 384
 385         /* Perform the machine specific initialisation */
 386         if (likely(sh_mv.mv_setup))
 387                 sh_mv.mv_setup(cmdline_p);
 388
 389         paging_init();
 390
 391 #ifdef CONFIG_SMP
 392         plat_smp_setup();
 393 #endif
 394 }
 395
 396 static const char *cpu_name[] = {
 397         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 398         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 399         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 400         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 401         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 402         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 403         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 404         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 405         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 406         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 407         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 408         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 409         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 410         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 411         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 412         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 413         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 414         [CPU_SH7366]    = "SH7366",     [CPU_SH_NONE]   = "Unknown"
 415 };
 416
 417 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 418 {
 419         return cpu_name[c->type];
 420 }
 421 EXPORT_SYMBOL(get_cpu_subtype);
 422
 423 #ifdef CONFIG_PROC_FS
 424 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 425 static const char *cpu_flags[] = {
 426         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 427         "ptea", "llsc", "l2", "op32", NULL
 428 };
 429
 430 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 431 {
 432         unsigned long i;
 433
 434         seq_printf(m, "cpu flags\t:");
 435
 436         if (!c->flags) {
 437                 seq_printf(m, " %s\n", cpu_flags[0]);
 438                 return;
 439         }
 440
 441         for (i = 0; cpu_flags[i]; i++)
 442                 if ((c->flags & (1 << i)))
 443                         seq_printf(m, " %s", cpu_flags[i+1]);
 444
 445         seq_printf(m, "\n");
 446 }
 447
 448 static void show_cacheinfo(struct seq_file *m, const char *type,
 449                            struct cache_info info)
 450 {
 451         unsigned int cache_size;
 452
 453         cache_size = info.ways * info.sets * info.linesz;
 454
 455         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 456                    type, cache_size >> 10, info.ways);
 457 }
 458
 459 /*
 460  *      Get CPU information for use by the procfs.
 461  */
 462 static int show_cpuinfo(struct seq_file *m, void *v)
 463 {
 464         struct sh_cpuinfo *c = v;
 465         unsigned int cpu = c - cpu_data;
 466
 467         if (!cpu_online(cpu))
 468                 return 0;
 469
 470         if (cpu == 0)
 471                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 472
 473         seq_printf(m, "processor\t: %d\n", cpu);
 474         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 475         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 476         if (c->cut_major == -1)
 477                 seq_printf(m, "cut\t\t: unknown\n");
 478         else if (c->cut_minor == -1)
 479                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 480         else
 481                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 482
 483         show_cpuflags(m, c);
 484
 485         seq_printf(m, "cache type\t: ");
 486
 487         /*
 488          * Check for what type of cache we have, we support both the
 489          * unified cache on the SH-2 and SH-3, as well as the harvard
 490          * style cache on the SH-4.
 491          */
 492         if (c->icache.flags & SH_CACHE_COMBINED) {
 493                 seq_printf(m, "unified\n");
 494                 show_cacheinfo(m, "cache", c->icache);
 495         } else {
 496                 seq_printf(m, "split (harvard)\n");
 497                 show_cacheinfo(m, "icache", c->icache);
 498                 show_cacheinfo(m, "dcache", c->dcache);
 499         }
 500
 501         /* Optional secondary cache */
 502         if (c->flags & CPU_HAS_L2_CACHE)
 503                 show_cacheinfo(m, "scache", c->scache);
 504
 505         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 506                      c->loops_per_jiffy/(500000/HZ),
 507                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 508
 509         return 0;
 510 }
 511
 512 static void *c_start(struct seq_file *m, loff_t *pos)
 513 {
 514         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 515 }
 516 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 517 {
 518         ++*pos;
 519         return c_start(m, pos);
 520 }
 521 static void c_stop(struct seq_file *m, void *v)
 522 {
 523 }
 524 const struct seq_operations cpuinfo_op = {
 525         .start  = c_start,
 526         .next   = c_next,
 527         .stop   = c_stop,
 528         .show   = show_cpuinfo,
 529 };
 530 #endif /* CONFIG_PROC_FS */
 531
 532 struct dentry *sh_debugfs_root;
 533
 534 static int __init sh_debugfs_init(void)
 535 {
 536         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 537         if (IS_ERR(sh_debugfs_root))
 538                 return PTR_ERR(sh_debugfs_root);
 539
 540         return 0;
 541 }
 542 arch_initcall(sh_debugfs_init);