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                 printk(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                 return 0;
 112         }
 113
 114         memory_end = memory_start + size;
 115
 116         return 0;
 117 }
 118 early_param("mem", early_parse_mem);
 119
 120 /*
 121  * Register fully available low RAM pages with the bootmem allocator.
 122  */
 123 static void __init register_bootmem_low_pages(void)
 124 {
 125         unsigned long curr_pfn, last_pfn, pages;
 126
 127         /*
 128          * We are rounding up the start address of usable memory:
 129          */
 130         curr_pfn = PFN_UP(__MEMORY_START);
 131
 132         /*
 133          * ... and at the end of the usable range downwards:
 134          */
 135         last_pfn = PFN_DOWN(__pa(memory_end));
 136
 137         if (last_pfn > max_low_pfn)
 138                 last_pfn = max_low_pfn;
 139
 140         pages = last_pfn - curr_pfn;
 141         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 142 }
 143
 144 #ifdef CONFIG_KEXEC
 145 static void __init reserve_crashkernel(void)
 146 {
 147         unsigned long long free_mem;
 148         unsigned long long crash_size, crash_base;
 149         void *vp;
 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                         vp = alloc_bootmem_nopanic(crash_size);
 159                         if (!vp) {
 160                                 printk(KERN_INFO "crashkernel allocation "
 161                                        "failed\n");
 162                                 return;
 163                         }
 164                         crash_base = __pa(vp);
 165                 } else if (reserve_bootmem(crash_base, crash_size,
 166                                         BOOTMEM_EXCLUSIVE) < 0) {
 167                         printk(KERN_INFO "crashkernel reservation failed - "
 168                                         "memory is in use\n");
 169                         return;
 170                 }
 171
 172                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 173                                 "for crashkernel (System RAM: %ldMB)\n",
 174                                 (unsigned long)(crash_size >> 20),
 175                                 (unsigned long)(crash_base >> 20),
 176                                 (unsigned long)(free_mem >> 20));
 177                 crashk_res.start = crash_base;
 178                 crashk_res.end   = crash_base + crash_size - 1;
 179                 insert_resource(&iomem_resource, &crashk_res);
 180         }
 181 }
 182 #else
 183 static inline void __init reserve_crashkernel(void)
 184 {}
 185 #endif
 186
 187 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 188 void __cpuinit calibrate_delay(void)
 189 {
 190         struct clk *clk = clk_get(NULL, "cpu_clk");
 191
 192         if (IS_ERR(clk))
 193                 panic("Need a sane CPU clock definition!");
 194
 195         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 196
 197         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 198                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 199                          loops_per_jiffy/(500000/HZ),
 200                          (loops_per_jiffy/(5000/HZ)) % 100,
 201                          loops_per_jiffy);
 202 }
 203 #endif
 204
 205 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 206                                                 unsigned long end_pfn)
 207 {
 208         struct resource *res = &mem_resources[nid];
 209
 210         WARN_ON(res->name); /* max one active range per node for now */
 211
 212         res->name = "System RAM";
 213         res->start = start_pfn << PAGE_SHIFT;
 214         res->end = (end_pfn << PAGE_SHIFT) - 1;
 215         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 216         if (request_resource(&iomem_resource, res)) {
 217                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 218                        start_pfn, end_pfn);
 219                 return;
 220         }
 221
 222         /*
 223          *  We don't know which RAM region contains kernel data,
 224          *  so we try it repeatedly and let the resource manager
 225          *  test it.
 226          */
 227         request_resource(res, &code_resource);
 228         request_resource(res, &data_resource);
 229         request_resource(res, &bss_resource);
 230
 231         add_active_range(nid, start_pfn, end_pfn);
 232 }
 233
 234 void __init setup_bootmem_allocator(unsigned long free_pfn)
 235 {
 236         unsigned long bootmap_size;
 237
 238         /*
 239          * Find a proper area for the bootmem bitmap. After this
 240          * bootstrap step all allocations (until the page allocator
 241          * is intact) must be done via bootmem_alloc().
 242          */
 243         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 244                                          min_low_pfn, max_low_pfn);
 245
 246         __add_active_range(0, min_low_pfn, max_low_pfn);
 247         register_bootmem_low_pages();
 248
 249         node_set_online(0);
 250
 251         /*
 252          * Reserve the kernel text and
 253          * Reserve the bootmem bitmap. We do this in two steps (first step
 254          * was init_bootmem()), because this catches the (definitely buggy)
 255          * case of us accidentally initializing the bootmem allocator with
 256          * an invalid RAM area.
 257          */
 258         reserve_bootmem(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 259                         (PFN_PHYS(free_pfn) + bootmap_size + PAGE_SIZE - 1) -
 260                         (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET),
 261                         BOOTMEM_DEFAULT);
 262
 263         /*
 264          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 265          */
 266         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 267                 reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
 268                                 BOOTMEM_DEFAULT);
 269
 270         sparse_memory_present_with_active_regions(0);
 271
 272 #ifdef CONFIG_BLK_DEV_INITRD
 273         ROOT_DEV = Root_RAM0;
 274
 275         if (LOADER_TYPE && INITRD_START) {
 276                 unsigned long initrd_start_phys = INITRD_START + __MEMORY_START;
 277
 278                 if (initrd_start_phys + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 279                         reserve_bootmem(initrd_start_phys, INITRD_SIZE,
 280                                         BOOTMEM_DEFAULT);
 281                         initrd_start = (unsigned long)__va(initrd_start_phys);
 282                         initrd_end = initrd_start + INITRD_SIZE;
 283                 } else {
 284                         printk("initrd extends beyond end of memory "
 285                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 286                                initrd_start_phys + INITRD_SIZE,
 287                                (unsigned long)PFN_PHYS(max_low_pfn));
 288                         initrd_start = 0;
 289                 }
 290         }
 291 #endif
 292
 293         reserve_crashkernel();
 294 }
 295
 296 #ifndef CONFIG_NEED_MULTIPLE_NODES
 297 static void __init setup_memory(void)
 298 {
 299         unsigned long start_pfn;
 300
 301         /*
 302          * Partially used pages are not usable - thus
 303          * we are rounding upwards:
 304          */
 305         start_pfn = PFN_UP(__pa(_end));
 306         setup_bootmem_allocator(start_pfn);
 307 }
 308 #else
 309 extern void __init setup_memory(void);
 310 #endif
 311
 312 /*
 313  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 314  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 315  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 316  */
 317 #ifdef CONFIG_CRASH_DUMP
 318 /* elfcorehdr= specifies the location of elf core header
 319  * stored by the crashed kernel.
 320  */
 321 static int __init parse_elfcorehdr(char *arg)
 322 {
 323         if (!arg)
 324                 return -EINVAL;
 325         elfcorehdr_addr = memparse(arg, &arg);
 326         return 0;
 327 }
 328 early_param("elfcorehdr", parse_elfcorehdr);
 329 #endif
 330
 331 void __init setup_arch(char **cmdline_p)
 332 {
 333         enable_mmu();
 334
 335         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 336
 337         printk(KERN_NOTICE "Boot params:\n"
 338                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 339                            "... RAMDISK_FLAGS     - %08lx\n"
 340                            "... ORIG_ROOT_DEV     - %08lx\n"
 341                            "... LOADER_TYPE       - %08lx\n"
 342                            "... INITRD_START      - %08lx\n"
 343                            "... INITRD_SIZE       - %08lx\n",
 344                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 345                            ORIG_ROOT_DEV, LOADER_TYPE,
 346                            INITRD_START, INITRD_SIZE);
 347
 348 #ifdef CONFIG_BLK_DEV_RAM
 349         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 350         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 351         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 352 #endif
 353
 354         if (!MOUNT_ROOT_RDONLY)
 355                 root_mountflags &= ~MS_RDONLY;
 356         init_mm.start_code = (unsigned long) _text;
 357         init_mm.end_code = (unsigned long) _etext;
 358         init_mm.end_data = (unsigned long) _edata;
 359         init_mm.brk = (unsigned long) _end;
 360
 361         code_resource.start = virt_to_phys(_text);
 362         code_resource.end = virt_to_phys(_etext)-1;
 363         data_resource.start = virt_to_phys(_etext);
 364         data_resource.end = virt_to_phys(_edata)-1;
 365         bss_resource.start = virt_to_phys(__bss_start);
 366         bss_resource.end = virt_to_phys(_ebss)-1;
 367
 368         memory_start = (unsigned long)__va(__MEMORY_START);
 369         if (!memory_end)
 370                 memory_end = memory_start + __MEMORY_SIZE;
 371
 372 #ifdef CONFIG_CMDLINE_BOOL
 373         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 374 #else
 375         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 376 #endif
 377
 378         /* Save unparsed command line copy for /proc/cmdline */
 379         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 380         *cmdline_p = command_line;
 381
 382         parse_early_param();
 383
 384         sh_mv_setup();
 385
 386         /*
 387          * Find the highest page frame number we have available
 388          */
 389         max_pfn = PFN_DOWN(__pa(memory_end));
 390
 391         /*
 392          * Determine low and high memory ranges:
 393          */
 394         max_low_pfn = max_pfn;
 395         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 396
 397         nodes_clear(node_online_map);
 398
 399         /* Setup bootmem with available RAM */
 400         setup_memory();
 401         sparse_init();
 402
 403 #ifdef CONFIG_DUMMY_CONSOLE
 404         conswitchp = &dummy_con;
 405 #endif
 406
 407         /* Perform the machine specific initialisation */
 408         if (likely(sh_mv.mv_setup))
 409                 sh_mv.mv_setup(cmdline_p);
 410
 411         paging_init();
 412
 413 #ifdef CONFIG_SMP
 414         plat_smp_setup();
 415 #endif
 416 }
 417
 418 static const char *cpu_name[] = {
 419         [CPU_SH7201]    = "SH7201",
 420         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 421         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 422         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 423         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 424         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 425         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 426         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 427         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 428         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 429         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 430         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 431         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 432         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 433         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 434         [CPU_SH7786]    = "SH7786",
 435         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 436         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 437         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 438         [CPU_SH7366]    = "SH7366",     [CPU_SH_NONE]   = "Unknown"
 439 };
 440
 441 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 442 {
 443         return cpu_name[c->type];
 444 }
 445 EXPORT_SYMBOL(get_cpu_subtype);
 446
 447 #ifdef CONFIG_PROC_FS
 448 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 449 static const char *cpu_flags[] = {
 450         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 451         "ptea", "llsc", "l2", "op32", "pteaex", NULL
 452 };
 453
 454 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 455 {
 456         unsigned long i;
 457
 458         seq_printf(m, "cpu flags\t:");
 459
 460         if (!c->flags) {
 461                 seq_printf(m, " %s\n", cpu_flags[0]);
 462                 return;
 463         }
 464
 465         for (i = 0; cpu_flags[i]; i++)
 466                 if ((c->flags & (1 << i)))
 467                         seq_printf(m, " %s", cpu_flags[i+1]);
 468
 469         seq_printf(m, "\n");
 470 }
 471
 472 static void show_cacheinfo(struct seq_file *m, const char *type,
 473                            struct cache_info info)
 474 {
 475         unsigned int cache_size;
 476
 477         cache_size = info.ways * info.sets * info.linesz;
 478
 479         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 480                    type, cache_size >> 10, info.ways);
 481 }
 482
 483 /*
 484  *      Get CPU information for use by the procfs.
 485  */
 486 static int show_cpuinfo(struct seq_file *m, void *v)
 487 {
 488         struct sh_cpuinfo *c = v;
 489         unsigned int cpu = c - cpu_data;
 490
 491         if (!cpu_online(cpu))
 492                 return 0;
 493
 494         if (cpu == 0)
 495                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 496
 497         seq_printf(m, "processor\t: %d\n", cpu);
 498         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 499         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 500         if (c->cut_major == -1)
 501                 seq_printf(m, "cut\t\t: unknown\n");
 502         else if (c->cut_minor == -1)
 503                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 504         else
 505                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 506
 507         show_cpuflags(m, c);
 508
 509         seq_printf(m, "cache type\t: ");
 510
 511         /*
 512          * Check for what type of cache we have, we support both the
 513          * unified cache on the SH-2 and SH-3, as well as the harvard
 514          * style cache on the SH-4.
 515          */
 516         if (c->icache.flags & SH_CACHE_COMBINED) {
 517                 seq_printf(m, "unified\n");
 518                 show_cacheinfo(m, "cache", c->icache);
 519         } else {
 520                 seq_printf(m, "split (harvard)\n");
 521                 show_cacheinfo(m, "icache", c->icache);
 522                 show_cacheinfo(m, "dcache", c->dcache);
 523         }
 524
 525         /* Optional secondary cache */
 526         if (c->flags & CPU_HAS_L2_CACHE)
 527                 show_cacheinfo(m, "scache", c->scache);
 528
 529         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 530                      c->loops_per_jiffy/(500000/HZ),
 531                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 532
 533         return 0;
 534 }
 535
 536 static void *c_start(struct seq_file *m, loff_t *pos)
 537 {
 538         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 539 }
 540 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 541 {
 542         ++*pos;
 543         return c_start(m, pos);
 544 }
 545 static void c_stop(struct seq_file *m, void *v)
 546 {
 547 }
 548 const struct seq_operations cpuinfo_op = {
 549         .start  = c_start,
 550         .next   = c_next,
 551         .stop   = c_stop,
 552         .show   = show_cpuinfo,
 553 };
 554 #endif /* CONFIG_PROC_FS */
 555
 556 struct dentry *sh_debugfs_root;
 557
 558 static int __init sh_debugfs_init(void)
 559 {
 560         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 561         if (!sh_debugfs_root)
 562                 return -ENOMEM;
 563         if (IS_ERR(sh_debugfs_root))
 564                 return PTR_ERR(sh_debugfs_root);
 565
 566         return 0;
 567 }
 568 arch_initcall(sh_debugfs_init);