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 <linux/crash_dump.h>
  29 #include <linux/mmzone.h>
  30 #include <linux/clk.h>
  31 #include <linux/delay.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/io.h>
  34 #include <asm/page.h>
  35 #include <asm/elf.h>
  36 #include <asm/sections.h>
  37 #include <asm/irq.h>
  38 #include <asm/setup.h>
  39 #include <asm/clock.h>
  40 #include <asm/mmu_context.h>
  41
  42 /*
  43  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  44  * This value will be used at the very early stage of serial setup.
  45  * The bigger value means no problem.
  46  */
  47 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  48         [0] = {
  49                 .type                   = CPU_SH_NONE,
  50                 .loops_per_jiffy        = 10000000,
  51         },
  52 };
  53 EXPORT_SYMBOL(cpu_data);
  54
  55 /*
  56  * The machine vector. First entry in .machvec.init, or clobbered by
  57  * sh_mv= on the command line, prior to .machvec.init teardown.
  58  */
  59 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  60 EXPORT_SYMBOL(sh_mv);
  61
  62 #ifdef CONFIG_VT
  63 struct screen_info screen_info;
  64 #endif
  65
  66 extern int root_mountflags;
  67
  68 #define RAMDISK_IMAGE_START_MASK        0x07FF
  69 #define RAMDISK_PROMPT_FLAG             0x8000
  70 #define RAMDISK_LOAD_FLAG               0x4000
  71
  72 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  73
  74 static struct resource code_resource = {
  75         .name = "Kernel code",
  76         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  77 };
  78
  79 static struct resource data_resource = {
  80         .name = "Kernel data",
  81         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  82 };
  83
  84 static struct resource bss_resource = {
  85         .name   = "Kernel bss",
  86         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 unsigned long memory_start;
  90 EXPORT_SYMBOL(memory_start);
  91 unsigned long memory_end = 0;
  92 EXPORT_SYMBOL(memory_end);
  93
  94 static struct resource mem_resources[MAX_NUMNODES];
  95
  96 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
  97
  98 static int __init early_parse_mem(char *p)
  99 {
 100         unsigned long size;
 101
 102         memory_start = (unsigned long)__va(__MEMORY_START);
 103         size = memparse(p, &p);
 104
 105         if (size > __MEMORY_SIZE) {
 106                 static char msg[] __initdata = KERN_ERR
 107                         "Using mem= to increase the size of kernel memory "
 108                         "is not allowed.\n"
 109                         "  Recompile the kernel with the correct value for "
 110                         "CONFIG_MEMORY_SIZE.\n";
 111                 printk(msg);
 112                 return 0;
 113         }
 114
 115         memory_end = memory_start + size;
 116
 117         return 0;
 118 }
 119 early_param("mem", early_parse_mem);
 120
 121 /*
 122  * Register fully available low RAM pages with the bootmem allocator.
 123  */
 124 static void __init register_bootmem_low_pages(void)
 125 {
 126         unsigned long curr_pfn, last_pfn, pages;
 127
 128         /*
 129          * We are rounding up the start address of usable memory:
 130          */
 131         curr_pfn = PFN_UP(__MEMORY_START);
 132
 133         /*
 134          * ... and at the end of the usable range downwards:
 135          */
 136         last_pfn = PFN_DOWN(__pa(memory_end));
 137
 138         if (last_pfn > max_low_pfn)
 139                 last_pfn = max_low_pfn;
 140
 141         pages = last_pfn - curr_pfn;
 142         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 143 }
 144
 145 #ifdef CONFIG_KEXEC
 146 static void __init reserve_crashkernel(void)
 147 {
 148         unsigned long long free_mem;
 149         unsigned long long crash_size, crash_base;
 150         int ret;
 151
 152         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 153
 154         ret = parse_crashkernel(boot_command_line, free_mem,
 155                         &crash_size, &crash_base);
 156         if (ret == 0 && crash_size) {
 157                 if (crash_base <= 0) {
 158                         printk(KERN_INFO "crashkernel reservation failed - "
 159                                         "you have to specify a base address\n");
 160                         return;
 161                 }
 162
 163                 if (reserve_bootmem(crash_base, crash_size,
 164                                         BOOTMEM_EXCLUSIVE) < 0) {
 165                         printk(KERN_INFO "crashkernel reservation failed - "
 166                                         "memory is in use\n");
 167                         return;
 168                 }
 169
 170                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 171                                 "for crashkernel (System RAM: %ldMB)\n",
 172                                 (unsigned long)(crash_size >> 20),
 173                                 (unsigned long)(crash_base >> 20),
 174                                 (unsigned long)(free_mem >> 20));
 175                 crashk_res.start = crash_base;
 176                 crashk_res.end   = crash_base + crash_size - 1;
 177                 insert_resource(&iomem_resource, &crashk_res);
 178         }
 179 }
 180 #else
 181 static inline void __init reserve_crashkernel(void)
 182 {}
 183 #endif
 184
 185 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 186 void __cpuinit calibrate_delay(void)
 187 {
 188         struct clk *clk = clk_get(NULL, "cpu_clk");
 189
 190         if (IS_ERR(clk))
 191                 panic("Need a sane CPU clock definition!");
 192
 193         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 194
 195         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 196                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 197                          loops_per_jiffy/(500000/HZ),
 198                          (loops_per_jiffy/(5000/HZ)) % 100,
 199                          loops_per_jiffy);
 200 }
 201 #endif
 202
 203 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 204                                                 unsigned long end_pfn)
 205 {
 206         struct resource *res = &mem_resources[nid];
 207
 208         WARN_ON(res->name); /* max one active range per node for now */
 209
 210         res->name = "System RAM";
 211         res->start = start_pfn << PAGE_SHIFT;
 212         res->end = (end_pfn << PAGE_SHIFT) - 1;
 213         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 214         if (request_resource(&iomem_resource, res)) {
 215                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 216                        start_pfn, end_pfn);
 217                 return;
 218         }
 219
 220         /*
 221          *  We don't know which RAM region contains kernel data,
 222          *  so we try it repeatedly and let the resource manager
 223          *  test it.
 224          */
 225         request_resource(res, &code_resource);
 226         request_resource(res, &data_resource);
 227         request_resource(res, &bss_resource);
 228
 229         add_active_range(nid, start_pfn, end_pfn);
 230 }
 231
 232 void __init setup_bootmem_allocator(unsigned long free_pfn)
 233 {
 234         unsigned long bootmap_size;
 235
 236         /*
 237          * Find a proper area for the bootmem bitmap. After this
 238          * bootstrap step all allocations (until the page allocator
 239          * is intact) must be done via bootmem_alloc().
 240          */
 241         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 242                                          min_low_pfn, max_low_pfn);
 243
 244         __add_active_range(0, min_low_pfn, max_low_pfn);
 245         register_bootmem_low_pages();
 246
 247         node_set_online(0);
 248
 249         /*
 250          * Reserve the kernel text and
 251          * Reserve the bootmem bitmap. We do this in two steps (first step
 252          * was init_bootmem()), because this catches the (definitely buggy)
 253          * case of us accidentally initializing the bootmem allocator with
 254          * an invalid RAM area.
 255          */
 256         reserve_bootmem(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 257                         (PFN_PHYS(free_pfn) + bootmap_size + PAGE_SIZE - 1) -
 258                         (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET),
 259                         BOOTMEM_DEFAULT);
 260
 261         /*
 262          * reserve physical page 0 - it's a special BIOS page on many boxes,
 263          * enabling clean reboots, SMP operation, laptop functions.
 264          */
 265         reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
 266                         BOOTMEM_DEFAULT);
 267
 268         sparse_memory_present_with_active_regions(0);
 269
 270 #ifdef CONFIG_BLK_DEV_INITRD
 271         ROOT_DEV = Root_RAM0;
 272
 273         if (LOADER_TYPE && INITRD_START) {
 274                 unsigned long initrd_start_phys = INITRD_START + __MEMORY_START;
 275
 276                 if (initrd_start_phys + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 277                         reserve_bootmem(initrd_start_phys, INITRD_SIZE,
 278                                         BOOTMEM_DEFAULT);
 279                         initrd_start = (unsigned long)__va(initrd_start_phys);
 280                         initrd_end = initrd_start + INITRD_SIZE;
 281                 } else {
 282                         printk("initrd extends beyond end of memory "
 283                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 284                                initrd_start_phys + INITRD_SIZE,
 285                                (unsigned long)PFN_PHYS(max_low_pfn));
 286                         initrd_start = 0;
 287                 }
 288         }
 289 #endif
 290
 291         reserve_crashkernel();
 292 }
 293
 294 #ifndef CONFIG_NEED_MULTIPLE_NODES
 295 static void __init setup_memory(void)
 296 {
 297         unsigned long start_pfn;
 298
 299         /*
 300          * Partially used pages are not usable - thus
 301          * we are rounding upwards:
 302          */
 303         start_pfn = PFN_UP(__pa(_end));
 304         setup_bootmem_allocator(start_pfn);
 305 }
 306 #else
 307 extern void __init setup_memory(void);
 308 #endif
 309
 310 /*
 311  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 312  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 313  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 314  */
 315 #ifdef CONFIG_CRASH_DUMP
 316 /* elfcorehdr= specifies the location of elf core header
 317  * stored by the crashed kernel.
 318  */
 319 static int __init parse_elfcorehdr(char *arg)
 320 {
 321         if (!arg)
 322                 return -EINVAL;
 323         elfcorehdr_addr = memparse(arg, &arg);
 324         return 0;
 325 }
 326 early_param("elfcorehdr", parse_elfcorehdr);
 327 #endif
 328
 329 void __init setup_arch(char **cmdline_p)
 330 {
 331         enable_mmu();
 332
 333         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 334
 335         printk(KERN_NOTICE "Boot params:\n"
 336                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 337                            "... RAMDISK_FLAGS     - %08lx\n"
 338                            "... ORIG_ROOT_DEV     - %08lx\n"
 339                            "... LOADER_TYPE       - %08lx\n"
 340                            "... INITRD_START      - %08lx\n"
 341                            "... INITRD_SIZE       - %08lx\n",
 342                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 343                            ORIG_ROOT_DEV, LOADER_TYPE,
 344                            INITRD_START, INITRD_SIZE);
 345
 346 #ifdef CONFIG_BLK_DEV_RAM
 347         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 348         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 349         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 350 #endif
 351
 352         if (!MOUNT_ROOT_RDONLY)
 353                 root_mountflags &= ~MS_RDONLY;
 354         init_mm.start_code = (unsigned long) _text;
 355         init_mm.end_code = (unsigned long) _etext;
 356         init_mm.end_data = (unsigned long) _edata;
 357         init_mm.brk = (unsigned long) _end;
 358
 359         code_resource.start = virt_to_phys(_text);
 360         code_resource.end = virt_to_phys(_etext)-1;
 361         data_resource.start = virt_to_phys(_etext);
 362         data_resource.end = virt_to_phys(_edata)-1;
 363         bss_resource.start = virt_to_phys(__bss_start);
 364         bss_resource.end = virt_to_phys(_ebss)-1;
 365
 366         memory_start = (unsigned long)__va(__MEMORY_START);
 367         if (!memory_end)
 368                 memory_end = memory_start + __MEMORY_SIZE;
 369
 370 #ifdef CONFIG_CMDLINE_BOOL
 371         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 372 #else
 373         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 374 #endif
 375
 376         /* Save unparsed command line copy for /proc/cmdline */
 377         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 378         *cmdline_p = command_line;
 379
 380         parse_early_param();
 381
 382         sh_mv_setup();
 383
 384         /*
 385          * Find the highest page frame number we have available
 386          */
 387         max_pfn = PFN_DOWN(__pa(memory_end));
 388
 389         /*
 390          * Determine low and high memory ranges:
 391          */
 392         max_low_pfn = max_pfn;
 393         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 394
 395         nodes_clear(node_online_map);
 396
 397         /* Setup bootmem with available RAM */
 398         setup_memory();
 399         sparse_init();
 400
 401 #ifdef CONFIG_DUMMY_CONSOLE
 402         conswitchp = &dummy_con;
 403 #endif
 404
 405         /* Perform the machine specific initialisation */
 406         if (likely(sh_mv.mv_setup))
 407                 sh_mv.mv_setup(cmdline_p);
 408
 409         paging_init();
 410
 411 #ifdef CONFIG_SMP
 412         plat_smp_setup();
 413 #endif
 414 }
 415
 416 static const char *cpu_name[] = {
 417         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 418         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 419         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 420         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 421         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 422         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 423         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 424         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 425         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 426         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 427         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 428         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 429         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 430         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 431         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 432         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 433         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 434         [CPU_SH7366]    = "SH7366",     [CPU_SH_NONE]   = "Unknown"
 435 };
 436
 437 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 438 {
 439         return cpu_name[c->type];
 440 }
 441 EXPORT_SYMBOL(get_cpu_subtype);
 442
 443 #ifdef CONFIG_PROC_FS
 444 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 445 static const char *cpu_flags[] = {
 446         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 447         "ptea", "llsc", "l2", "op32", NULL
 448 };
 449
 450 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 451 {
 452         unsigned long i;
 453
 454         seq_printf(m, "cpu flags\t:");
 455
 456         if (!c->flags) {
 457                 seq_printf(m, " %s\n", cpu_flags[0]);
 458                 return;
 459         }
 460
 461         for (i = 0; cpu_flags[i]; i++)
 462                 if ((c->flags & (1 << i)))
 463                         seq_printf(m, " %s", cpu_flags[i+1]);
 464
 465         seq_printf(m, "\n");
 466 }
 467
 468 static void show_cacheinfo(struct seq_file *m, const char *type,
 469                            struct cache_info info)
 470 {
 471         unsigned int cache_size;
 472
 473         cache_size = info.ways * info.sets * info.linesz;
 474
 475         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 476                    type, cache_size >> 10, info.ways);
 477 }
 478
 479 /*
 480  *      Get CPU information for use by the procfs.
 481  */
 482 static int show_cpuinfo(struct seq_file *m, void *v)
 483 {
 484         struct sh_cpuinfo *c = v;
 485         unsigned int cpu = c - cpu_data;
 486
 487         if (!cpu_online(cpu))
 488                 return 0;
 489
 490         if (cpu == 0)
 491                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 492
 493         seq_printf(m, "processor\t: %d\n", cpu);
 494         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 495         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 496         if (c->cut_major == -1)
 497                 seq_printf(m, "cut\t\t: unknown\n");
 498         else if (c->cut_minor == -1)
 499                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 500         else
 501                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 502
 503         show_cpuflags(m, c);
 504
 505         seq_printf(m, "cache type\t: ");
 506
 507         /*
 508          * Check for what type of cache we have, we support both the
 509          * unified cache on the SH-2 and SH-3, as well as the harvard
 510          * style cache on the SH-4.
 511          */
 512         if (c->icache.flags & SH_CACHE_COMBINED) {
 513                 seq_printf(m, "unified\n");
 514                 show_cacheinfo(m, "cache", c->icache);
 515         } else {
 516                 seq_printf(m, "split (harvard)\n");
 517                 show_cacheinfo(m, "icache", c->icache);
 518                 show_cacheinfo(m, "dcache", c->dcache);
 519         }
 520
 521         /* Optional secondary cache */
 522         if (c->flags & CPU_HAS_L2_CACHE)
 523                 show_cacheinfo(m, "scache", c->scache);
 524
 525         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 526                      c->loops_per_jiffy/(500000/HZ),
 527                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 528
 529         return 0;
 530 }
 531
 532 static void *c_start(struct seq_file *m, loff_t *pos)
 533 {
 534         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 535 }
 536 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 537 {
 538         ++*pos;
 539         return c_start(m, pos);
 540 }
 541 static void c_stop(struct seq_file *m, void *v)
 542 {
 543 }
 544 const struct seq_operations cpuinfo_op = {
 545         .start  = c_start,
 546         .next   = c_next,
 547         .stop   = c_stop,
 548         .show   = show_cpuinfo,
 549 };
 550 #endif /* CONFIG_PROC_FS */
 551
 552 struct dentry *sh_debugfs_root;
 553
 554 static int __init sh_debugfs_init(void)
 555 {
 556         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 557         if (!sh_debugfs_root)
 558                 return -ENOMEM;
 559         if (IS_ERR(sh_debugfs_root))
 560                 return PTR_ERR(sh_debugfs_root);
 561
 562         return 0;
 563 }
 564 arch_initcall(sh_debugfs_init);