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 <linux/platform_device.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/io.h>
  35 #include <asm/page.h>
  36 #include <asm/elf.h>
  37 #include <asm/sections.h>
  38 #include <asm/irq.h>
  39 #include <asm/setup.h>
  40 #include <asm/clock.h>
  41 #include <asm/mmu_context.h>
  42
  43 /*
  44  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  45  * This value will be used at the very early stage of serial setup.
  46  * The bigger value means no problem.
  47  */
  48 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  49         [0] = {
  50                 .type                   = CPU_SH_NONE,
  51                 .loops_per_jiffy        = 10000000,
  52         },
  53 };
  54 EXPORT_SYMBOL(cpu_data);
  55
  56 /*
  57  * The machine vector. First entry in .machvec.init, or clobbered by
  58  * sh_mv= on the command line, prior to .machvec.init teardown.
  59  */
  60 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  61 EXPORT_SYMBOL(sh_mv);
  62
  63 #ifdef CONFIG_VT
  64 struct screen_info screen_info;
  65 #endif
  66
  67 extern int root_mountflags;
  68
  69 #define RAMDISK_IMAGE_START_MASK        0x07FF
  70 #define RAMDISK_PROMPT_FLAG             0x8000
  71 #define RAMDISK_LOAD_FLAG               0x4000
  72
  73 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  74
  75 static struct resource code_resource = {
  76         .name = "Kernel code",
  77         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  78 };
  79
  80 static struct resource data_resource = {
  81         .name = "Kernel data",
  82         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  83 };
  84
  85 static struct resource bss_resource = {
  86         .name   = "Kernel bss",
  87         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  88 };
  89
  90 unsigned long memory_start;
  91 EXPORT_SYMBOL(memory_start);
  92 unsigned long memory_end = 0;
  93 EXPORT_SYMBOL(memory_end);
  94
  95 static struct resource mem_resources[MAX_NUMNODES];
  96
  97 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
  98
  99 static int __init early_parse_mem(char *p)
 100 {
 101         unsigned long size;
 102
 103         memory_start = (unsigned long)__va(__MEMORY_START);
 104         size = memparse(p, &p);
 105
 106         if (size > __MEMORY_SIZE) {
 107                 printk(KERN_ERR
 108                         "Using mem= to increase the size of kernel memory "
 109                         "is not allowed.\n"
 110                         "  Recompile the kernel with the correct value for "
 111                         "CONFIG_MEMORY_SIZE.\n");
 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         void *vp;
 151         int ret;
 152
 153         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 154
 155         ret = parse_crashkernel(boot_command_line, free_mem,
 156                         &crash_size, &crash_base);
 157         if (ret == 0 && crash_size) {
 158                 if (crash_base <= 0) {
 159                         vp = alloc_bootmem_nopanic(crash_size);
 160                         if (!vp) {
 161                                 printk(KERN_INFO "crashkernel allocation "
 162                                        "failed\n");
 163                                 return;
 164                         }
 165                         crash_base = __pa(vp);
 166                 } else if (reserve_bootmem(crash_base, crash_size,
 167                                         BOOTMEM_EXCLUSIVE) < 0) {
 168                         printk(KERN_INFO "crashkernel reservation failed - "
 169                                         "memory is in use\n");
 170                         return;
 171                 }
 172
 173                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 174                                 "for crashkernel (System RAM: %ldMB)\n",
 175                                 (unsigned long)(crash_size >> 20),
 176                                 (unsigned long)(crash_base >> 20),
 177                                 (unsigned long)(free_mem >> 20));
 178                 crashk_res.start = crash_base;
 179                 crashk_res.end   = crash_base + crash_size - 1;
 180                 insert_resource(&iomem_resource, &crashk_res);
 181         }
 182 }
 183 #else
 184 static inline void __init reserve_crashkernel(void)
 185 {}
 186 #endif
 187
 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
 204 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 205                                                 unsigned long end_pfn)
 206 {
 207         struct resource *res = &mem_resources[nid];
 208
 209         WARN_ON(res->name); /* max one active range per node for now */
 210
 211         res->name = "System RAM";
 212         res->start = start_pfn << PAGE_SHIFT;
 213         res->end = (end_pfn << PAGE_SHIFT) - 1;
 214         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 215         if (request_resource(&iomem_resource, res)) {
 216                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 217                        start_pfn, end_pfn);
 218                 return;
 219         }
 220
 221         /*
 222          *  We don't know which RAM region contains kernel data,
 223          *  so we try it repeatedly and let the resource manager
 224          *  test it.
 225          */
 226         request_resource(res, &code_resource);
 227         request_resource(res, &data_resource);
 228         request_resource(res, &bss_resource);
 229
 230         add_active_range(nid, start_pfn, end_pfn);
 231 }
 232
 233 void __init setup_bootmem_allocator(unsigned long free_pfn)
 234 {
 235         unsigned long bootmap_size;
 236
 237         /*
 238          * Find a proper area for the bootmem bitmap. After this
 239          * bootstrap step all allocations (until the page allocator
 240          * is intact) must be done via bootmem_alloc().
 241          */
 242         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 243                                          min_low_pfn, max_low_pfn);
 244
 245         __add_active_range(0, min_low_pfn, max_low_pfn);
 246         register_bootmem_low_pages();
 247
 248         node_set_online(0);
 249
 250         /*
 251          * Reserve the kernel text and
 252          * Reserve the bootmem bitmap. We do this in two steps (first step
 253          * was init_bootmem()), because this catches the (definitely buggy)
 254          * case of us accidentally initializing the bootmem allocator with
 255          * an invalid RAM area.
 256          */
 257         reserve_bootmem(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 258                         (PFN_PHYS(free_pfn) + bootmap_size + PAGE_SIZE - 1) -
 259                         (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET),
 260                         BOOTMEM_DEFAULT);
 261
 262         /*
 263          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 264          */
 265         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 266                 reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
 267                                 BOOTMEM_DEFAULT);
 268
 269         sparse_memory_present_with_active_regions(0);
 270
 271 #ifdef CONFIG_BLK_DEV_INITRD
 272         ROOT_DEV = Root_RAM0;
 273
 274         if (LOADER_TYPE && INITRD_START) {
 275                 unsigned long initrd_start_phys = INITRD_START + __MEMORY_START;
 276
 277                 if (initrd_start_phys + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 278                         reserve_bootmem(initrd_start_phys, INITRD_SIZE,
 279                                         BOOTMEM_DEFAULT);
 280                         initrd_start = (unsigned long)__va(initrd_start_phys);
 281                         initrd_end = initrd_start + INITRD_SIZE;
 282                 } else {
 283                         printk("initrd extends beyond end of memory "
 284                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 285                                initrd_start_phys + INITRD_SIZE,
 286                                (unsigned long)PFN_PHYS(max_low_pfn));
 287                         initrd_start = 0;
 288                 }
 289         }
 290 #endif
 291
 292         reserve_crashkernel();
 293 }
 294
 295 #ifndef CONFIG_NEED_MULTIPLE_NODES
 296 static void __init setup_memory(void)
 297 {
 298         unsigned long start_pfn;
 299
 300         /*
 301          * Partially used pages are not usable - thus
 302          * we are rounding upwards:
 303          */
 304         start_pfn = PFN_UP(__pa(_end));
 305         setup_bootmem_allocator(start_pfn);
 306 }
 307 #else
 308 extern void __init setup_memory(void);
 309 #endif
 310
 311 /*
 312  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 313  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 314  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 315  */
 316 #ifdef CONFIG_CRASH_DUMP
 317 /* elfcorehdr= specifies the location of elf core header
 318  * stored by the crashed kernel.
 319  */
 320 static int __init parse_elfcorehdr(char *arg)
 321 {
 322         if (!arg)
 323                 return -EINVAL;
 324         elfcorehdr_addr = memparse(arg, &arg);
 325         return 0;
 326 }
 327 early_param("elfcorehdr", parse_elfcorehdr);
 328 #endif
 329
 330 void __init __attribute__ ((weak)) plat_early_device_setup(void)
 331 {
 332 }
 333
 334 void __init setup_arch(char **cmdline_p)
 335 {
 336         enable_mmu();
 337
 338         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 339
 340         printk(KERN_NOTICE "Boot params:\n"
 341                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 342                            "... RAMDISK_FLAGS     - %08lx\n"
 343                            "... ORIG_ROOT_DEV     - %08lx\n"
 344                            "... LOADER_TYPE       - %08lx\n"
 345                            "... INITRD_START      - %08lx\n"
 346                            "... INITRD_SIZE       - %08lx\n",
 347                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 348                            ORIG_ROOT_DEV, LOADER_TYPE,
 349                            INITRD_START, INITRD_SIZE);
 350
 351 #ifdef CONFIG_BLK_DEV_RAM
 352         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 353         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 354         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 355 #endif
 356
 357         if (!MOUNT_ROOT_RDONLY)
 358                 root_mountflags &= ~MS_RDONLY;
 359         init_mm.start_code = (unsigned long) _text;
 360         init_mm.end_code = (unsigned long) _etext;
 361         init_mm.end_data = (unsigned long) _edata;
 362         init_mm.brk = (unsigned long) _end;
 363
 364         code_resource.start = virt_to_phys(_text);
 365         code_resource.end = virt_to_phys(_etext)-1;
 366         data_resource.start = virt_to_phys(_etext);
 367         data_resource.end = virt_to_phys(_edata)-1;
 368         bss_resource.start = virt_to_phys(__bss_start);
 369         bss_resource.end = virt_to_phys(_ebss)-1;
 370
 371         memory_start = (unsigned long)__va(__MEMORY_START);
 372         if (!memory_end)
 373                 memory_end = memory_start + __MEMORY_SIZE;
 374
 375 #ifdef CONFIG_CMDLINE_BOOL
 376         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 377 #else
 378         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 379 #endif
 380
 381         /* Save unparsed command line copy for /proc/cmdline */
 382         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 383         *cmdline_p = command_line;
 384
 385         parse_early_param();
 386
 387         plat_early_device_setup();
 388
 389         sh_mv_setup();
 390
 391         /*
 392          * Find the highest page frame number we have available
 393          */
 394         max_pfn = PFN_DOWN(__pa(memory_end));
 395
 396         /*
 397          * Determine low and high memory ranges:
 398          */
 399         max_low_pfn = max_pfn;
 400         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 401
 402         nodes_clear(node_online_map);
 403
 404         /* Setup bootmem with available RAM */
 405         setup_memory();
 406         sparse_init();
 407
 408 #ifdef CONFIG_DUMMY_CONSOLE
 409         conswitchp = &dummy_con;
 410 #endif
 411
 412         /* Perform the machine specific initialisation */
 413         if (likely(sh_mv.mv_setup))
 414                 sh_mv.mv_setup(cmdline_p);
 415
 416         paging_init();
 417
 418 #ifdef CONFIG_SMP
 419         plat_smp_setup();
 420 #endif
 421 }
 422
 423 /* processor boot mode configuration */
 424 int generic_mode_pins(void)
 425 {
 426         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 427         return 0;
 428 }
 429
 430 int test_mode_pin(int pin)
 431 {
 432         return sh_mv.mv_mode_pins() & pin;
 433 }
 434
 435 static const char *cpu_name[] = {
 436         [CPU_SH7201]    = "SH7201",
 437         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 438         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 439         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 440         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 441         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 442         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 443         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 444         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 445         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 446         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 447         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 448         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 449         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 450         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 451         [CPU_SH7786]    = "SH7786",
 452         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 453         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 454         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 455         [CPU_SH7366]    = "SH7366",     [CPU_SH7724]    = "SH7724",
 456         [CPU_SH_NONE]   = "Unknown"
 457 };
 458
 459 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 460 {
 461         return cpu_name[c->type];
 462 }
 463 EXPORT_SYMBOL(get_cpu_subtype);
 464
 465 #ifdef CONFIG_PROC_FS
 466 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 467 static const char *cpu_flags[] = {
 468         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 469         "ptea", "llsc", "l2", "op32", "pteaex", NULL
 470 };
 471
 472 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 473 {
 474         unsigned long i;
 475
 476         seq_printf(m, "cpu flags\t:");
 477
 478         if (!c->flags) {
 479                 seq_printf(m, " %s\n", cpu_flags[0]);
 480                 return;
 481         }
 482
 483         for (i = 0; cpu_flags[i]; i++)
 484                 if ((c->flags & (1 << i)))
 485                         seq_printf(m, " %s", cpu_flags[i+1]);
 486
 487         seq_printf(m, "\n");
 488 }
 489
 490 static void show_cacheinfo(struct seq_file *m, const char *type,
 491                            struct cache_info info)
 492 {
 493         unsigned int cache_size;
 494
 495         cache_size = info.ways * info.sets * info.linesz;
 496
 497         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 498                    type, cache_size >> 10, info.ways);
 499 }
 500
 501 /*
 502  *      Get CPU information for use by the procfs.
 503  */
 504 static int show_cpuinfo(struct seq_file *m, void *v)
 505 {
 506         struct sh_cpuinfo *c = v;
 507         unsigned int cpu = c - cpu_data;
 508
 509         if (!cpu_online(cpu))
 510                 return 0;
 511
 512         if (cpu == 0)
 513                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 514
 515         seq_printf(m, "processor\t: %d\n", cpu);
 516         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 517         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 518         if (c->cut_major == -1)
 519                 seq_printf(m, "cut\t\t: unknown\n");
 520         else if (c->cut_minor == -1)
 521                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 522         else
 523                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 524
 525         show_cpuflags(m, c);
 526
 527         seq_printf(m, "cache type\t: ");
 528
 529         /*
 530          * Check for what type of cache we have, we support both the
 531          * unified cache on the SH-2 and SH-3, as well as the harvard
 532          * style cache on the SH-4.
 533          */
 534         if (c->icache.flags & SH_CACHE_COMBINED) {
 535                 seq_printf(m, "unified\n");
 536                 show_cacheinfo(m, "cache", c->icache);
 537         } else {
 538                 seq_printf(m, "split (harvard)\n");
 539                 show_cacheinfo(m, "icache", c->icache);
 540                 show_cacheinfo(m, "dcache", c->dcache);
 541         }
 542
 543         /* Optional secondary cache */
 544         if (c->flags & CPU_HAS_L2_CACHE)
 545                 show_cacheinfo(m, "scache", c->scache);
 546
 547         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 548                      c->loops_per_jiffy/(500000/HZ),
 549                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 550
 551         return 0;
 552 }
 553
 554 static void *c_start(struct seq_file *m, loff_t *pos)
 555 {
 556         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 557 }
 558 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 559 {
 560         ++*pos;
 561         return c_start(m, pos);
 562 }
 563 static void c_stop(struct seq_file *m, void *v)
 564 {
 565 }
 566 const struct seq_operations cpuinfo_op = {
 567         .start  = c_start,
 568         .next   = c_next,
 569         .stop   = c_stop,
 570         .show   = show_cpuinfo,
 571 };
 572 #endif /* CONFIG_PROC_FS */
 573
 574 struct dentry *sh_debugfs_root;
 575
 576 static int __init sh_debugfs_init(void)
 577 {
 578         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 579         if (!sh_debugfs_root)
 580                 return -ENOMEM;
 581         if (IS_ERR(sh_debugfs_root))
 582                 return PTR_ERR(sh_debugfs_root);
 583
 584         return 0;
 585 }
 586 arch_initcall(sh_debugfs_init);