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 <linux/lmb.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/io.h>
  36 #include <asm/page.h>
  37 #include <asm/elf.h>
  38 #include <asm/sections.h>
  39 #include <asm/irq.h>
  40 #include <asm/setup.h>
  41 #include <asm/clock.h>
  42 #include <asm/smp.h>
  43 #include <asm/mmu_context.h>
  44
  45 /*
  46  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  47  * This value will be used at the very early stage of serial setup.
  48  * The bigger value means no problem.
  49  */
  50 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  51         [0] = {
  52                 .type                   = CPU_SH_NONE,
  53                 .family                 = CPU_FAMILY_UNKNOWN,
  54                 .loops_per_jiffy        = 10000000,
  55         },
  56 };
  57 EXPORT_SYMBOL(cpu_data);
  58
  59 /*
  60  * The machine vector. First entry in .machvec.init, or clobbered by
  61  * sh_mv= on the command line, prior to .machvec.init teardown.
  62  */
  63 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  64 EXPORT_SYMBOL(sh_mv);
  65
  66 #ifdef CONFIG_VT
  67 struct screen_info screen_info;
  68 #endif
  69
  70 extern int root_mountflags;
  71
  72 #define RAMDISK_IMAGE_START_MASK        0x07FF
  73 #define RAMDISK_PROMPT_FLAG             0x8000
  74 #define RAMDISK_LOAD_FLAG               0x4000
  75
  76 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  77
  78 static struct resource code_resource = {
  79         .name = "Kernel code",
  80         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  81 };
  82
  83 static struct resource data_resource = {
  84         .name = "Kernel data",
  85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  86 };
  87
  88 static struct resource bss_resource = {
  89         .name   = "Kernel bss",
  90         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  91 };
  92
  93 unsigned long memory_start;
  94 EXPORT_SYMBOL(memory_start);
  95 unsigned long memory_end = 0;
  96 EXPORT_SYMBOL(memory_end);
  97
  98 static struct resource mem_resources[MAX_NUMNODES];
  99
 100 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 101
 102 static int __init early_parse_mem(char *p)
 103 {
 104         unsigned long size;
 105
 106         memory_start = (unsigned long)__va(__MEMORY_START);
 107         size = memparse(p, &p);
 108
 109         if (size > __MEMORY_SIZE) {
 110                 printk(KERN_ERR
 111                         "Using mem= to increase the size of kernel memory "
 112                         "is not allowed.\n"
 113                         "  Recompile the kernel with the correct value for "
 114                         "CONFIG_MEMORY_SIZE.\n");
 115                 return 0;
 116         }
 117
 118         memory_end = memory_start + size;
 119
 120         return 0;
 121 }
 122 early_param("mem", early_parse_mem);
 123
 124 /*
 125  * Register fully available low RAM pages with the bootmem allocator.
 126  */
 127 static void __init register_bootmem_low_pages(void)
 128 {
 129         unsigned long curr_pfn, last_pfn, pages;
 130
 131         /*
 132          * We are rounding up the start address of usable memory:
 133          */
 134         curr_pfn = PFN_UP(__MEMORY_START);
 135
 136         /*
 137          * ... and at the end of the usable range downwards:
 138          */
 139         last_pfn = PFN_DOWN(__pa(memory_end));
 140
 141         if (last_pfn > max_low_pfn)
 142                 last_pfn = max_low_pfn;
 143
 144         pages = last_pfn - curr_pfn;
 145         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 146 }
 147
 148 static void __init check_for_initrd(void)
 149 {
 150 #ifdef CONFIG_BLK_DEV_INITRD
 151         unsigned long start, end;
 152
 153         /*
 154          * Check for the rare cases where boot loaders adhere to the boot
 155          * ABI.
 156          */
 157         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 158                 goto disable;
 159
 160         start = INITRD_START + __MEMORY_START;
 161         end = start + INITRD_SIZE;
 162
 163         if (unlikely(end <= start))
 164                 goto disable;
 165         if (unlikely(start & ~PAGE_MASK)) {
 166                 pr_err("initrd must be page aligned\n");
 167                 goto disable;
 168         }
 169
 170         if (unlikely(start < PAGE_OFFSET)) {
 171                 pr_err("initrd start < PAGE_OFFSET\n");
 172                 goto disable;
 173         }
 174
 175         if (unlikely(end > lmb_end_of_DRAM())) {
 176                 pr_err("initrd extends beyond end of memory "
 177                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 178                        end, (unsigned long)lmb_end_of_DRAM());
 179                 goto disable;
 180         }
 181
 182         /*
 183          * If we got this far inspite of the boot loader's best efforts
 184          * to the contrary, assume we actually have a valid initrd and
 185          * fix up the root dev.
 186          */
 187         ROOT_DEV = Root_RAM0;
 188
 189         /*
 190          * Address sanitization
 191          */
 192         initrd_start = (unsigned long)__va(__pa(start));
 193         initrd_end = initrd_start + INITRD_SIZE;
 194
 195         lmb_reserve(__pa(initrd_start), INITRD_SIZE);
 196
 197         return;
 198
 199 disable:
 200         pr_info("initrd disabled\n");
 201         initrd_start = initrd_end = 0;
 202 #endif
 203 }
 204
 205 void __cpuinit calibrate_delay(void)
 206 {
 207         struct clk *clk = clk_get(NULL, "cpu_clk");
 208
 209         if (IS_ERR(clk))
 210                 panic("Need a sane CPU clock definition!");
 211
 212         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 213
 214         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 215                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 216                          loops_per_jiffy/(500000/HZ),
 217                          (loops_per_jiffy/(5000/HZ)) % 100,
 218                          loops_per_jiffy);
 219 }
 220
 221 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 222                                                 unsigned long end_pfn)
 223 {
 224         struct resource *res = &mem_resources[nid];
 225
 226         WARN_ON(res->name); /* max one active range per node for now */
 227
 228         res->name = "System RAM";
 229         res->start = start_pfn << PAGE_SHIFT;
 230         res->end = (end_pfn << PAGE_SHIFT) - 1;
 231         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 232         if (request_resource(&iomem_resource, res)) {
 233                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 234                        start_pfn, end_pfn);
 235                 return;
 236         }
 237
 238         /*
 239          *  We don't know which RAM region contains kernel data,
 240          *  so we try it repeatedly and let the resource manager
 241          *  test it.
 242          */
 243         request_resource(res, &code_resource);
 244         request_resource(res, &data_resource);
 245         request_resource(res, &bss_resource);
 246
 247         add_active_range(nid, start_pfn, end_pfn);
 248 }
 249
 250 void __init setup_bootmem_allocator(unsigned long free_pfn)
 251 {
 252         unsigned long bootmap_size;
 253         unsigned long bootmap_pages, bootmem_paddr;
 254         u64 total_pages = (lmb_end_of_DRAM() - __MEMORY_START) >> PAGE_SHIFT;
 255         int i;
 256
 257         bootmap_pages = bootmem_bootmap_pages(total_pages);
 258
 259         bootmem_paddr = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
 260
 261         /*
 262          * Find a proper area for the bootmem bitmap. After this
 263          * bootstrap step all allocations (until the page allocator
 264          * is intact) must be done via bootmem_alloc().
 265          */
 266         bootmap_size = init_bootmem_node(NODE_DATA(0),
 267                                          bootmem_paddr >> PAGE_SHIFT,
 268                                          min_low_pfn, max_low_pfn);
 269
 270         /* Add active regions with valid PFNs. */
 271         for (i = 0; i < lmb.memory.cnt; i++) {
 272                 unsigned long start_pfn, end_pfn;
 273                 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
 274                 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
 275                 __add_active_range(0, start_pfn, end_pfn);
 276         }
 277
 278         /*
 279          * Add all physical memory to the bootmem map and mark each
 280          * area as present.
 281          */
 282         register_bootmem_low_pages();
 283
 284         /* Reserve the sections we're already using. */
 285         for (i = 0; i < lmb.reserved.cnt; i++)
 286                 reserve_bootmem(lmb.reserved.region[i].base,
 287                                 lmb_size_bytes(&lmb.reserved, i),
 288                                 BOOTMEM_DEFAULT);
 289
 290         node_set_online(0);
 291
 292         sparse_memory_present_with_active_regions(0);
 293
 294         check_for_initrd();
 295
 296         reserve_crashkernel();
 297 }
 298
 299 #ifndef CONFIG_NEED_MULTIPLE_NODES
 300 static void __init setup_memory(void)
 301 {
 302         unsigned long start_pfn;
 303         u64 base = min_low_pfn << PAGE_SHIFT;
 304         u64 size = (max_low_pfn << PAGE_SHIFT) - base;
 305
 306         /*
 307          * Partially used pages are not usable - thus
 308          * we are rounding upwards:
 309          */
 310         start_pfn = PFN_UP(__pa(_end));
 311
 312         lmb_add(base, size);
 313
 314         /*
 315          * Reserve the kernel text and
 316          * Reserve the bootmem bitmap. We do this in two steps (first step
 317          * was init_bootmem()), because this catches the (definitely buggy)
 318          * case of us accidentally initializing the bootmem allocator with
 319          * an invalid RAM area.
 320          */
 321         lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 322                     (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
 323                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
 324
 325         /*
 326          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 327          */
 328         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 329                 lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
 330
 331         lmb_analyze();
 332         lmb_dump_all();
 333
 334         setup_bootmem_allocator(start_pfn);
 335 }
 336 #else
 337 extern void __init setup_memory(void);
 338 #endif
 339
 340 /*
 341  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 342  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 343  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 344  */
 345 #ifdef CONFIG_CRASH_DUMP
 346 /* elfcorehdr= specifies the location of elf core header
 347  * stored by the crashed kernel.
 348  */
 349 static int __init parse_elfcorehdr(char *arg)
 350 {
 351         if (!arg)
 352                 return -EINVAL;
 353         elfcorehdr_addr = memparse(arg, &arg);
 354         return 0;
 355 }
 356 early_param("elfcorehdr", parse_elfcorehdr);
 357 #endif
 358
 359 void __init __attribute__ ((weak)) plat_early_device_setup(void)
 360 {
 361 }
 362
 363 void __init setup_arch(char **cmdline_p)
 364 {
 365         enable_mmu();
 366
 367         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 368
 369         printk(KERN_NOTICE "Boot params:\n"
 370                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 371                            "... RAMDISK_FLAGS     - %08lx\n"
 372                            "... ORIG_ROOT_DEV     - %08lx\n"
 373                            "... LOADER_TYPE       - %08lx\n"
 374                            "... INITRD_START      - %08lx\n"
 375                            "... INITRD_SIZE       - %08lx\n",
 376                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 377                            ORIG_ROOT_DEV, LOADER_TYPE,
 378                            INITRD_START, INITRD_SIZE);
 379
 380 #ifdef CONFIG_BLK_DEV_RAM
 381         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 382         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 383         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 384 #endif
 385
 386         if (!MOUNT_ROOT_RDONLY)
 387                 root_mountflags &= ~MS_RDONLY;
 388         init_mm.start_code = (unsigned long) _text;
 389         init_mm.end_code = (unsigned long) _etext;
 390         init_mm.end_data = (unsigned long) _edata;
 391         init_mm.brk = (unsigned long) _end;
 392
 393         code_resource.start = virt_to_phys(_text);
 394         code_resource.end = virt_to_phys(_etext)-1;
 395         data_resource.start = virt_to_phys(_etext);
 396         data_resource.end = virt_to_phys(_edata)-1;
 397         bss_resource.start = virt_to_phys(__bss_start);
 398         bss_resource.end = virt_to_phys(_ebss)-1;
 399
 400         memory_start = (unsigned long)__va(__MEMORY_START);
 401         if (!memory_end)
 402                 memory_end = memory_start + __MEMORY_SIZE;
 403
 404 #ifdef CONFIG_CMDLINE_OVERWRITE
 405         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 406 #else
 407         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 408 #ifdef CONFIG_CMDLINE_EXTEND
 409         strlcat(command_line, " ", sizeof(command_line));
 410         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 411 #endif
 412 #endif
 413
 414         /* Save unparsed command line copy for /proc/cmdline */
 415         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 416         *cmdline_p = command_line;
 417
 418         parse_early_param();
 419
 420         uncached_init();
 421
 422         plat_early_device_setup();
 423
 424         /* Let earlyprintk output early console messages */
 425         early_platform_driver_probe("earlyprintk", 1, 1);
 426
 427         sh_mv_setup();
 428
 429         /*
 430          * Find the highest page frame number we have available
 431          */
 432         max_pfn = PFN_DOWN(__pa(memory_end));
 433
 434         /*
 435          * Determine low and high memory ranges:
 436          */
 437         max_low_pfn = max_pfn;
 438         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 439
 440         nodes_clear(node_online_map);
 441
 442         pmb_init();
 443         lmb_init();
 444         setup_memory();
 445         sparse_init();
 446
 447 #ifdef CONFIG_DUMMY_CONSOLE
 448         conswitchp = &dummy_con;
 449 #endif
 450         paging_init();
 451
 452         ioremap_fixed_init();
 453
 454         /* Perform the machine specific initialisation */
 455         if (likely(sh_mv.mv_setup))
 456                 sh_mv.mv_setup(cmdline_p);
 457
 458         plat_smp_setup();
 459 }
 460
 461 /* processor boot mode configuration */
 462 int generic_mode_pins(void)
 463 {
 464         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 465         return 0;
 466 }
 467
 468 int test_mode_pin(int pin)
 469 {
 470         return sh_mv.mv_mode_pins() & pin;
 471 }
 472
 473 static const char *cpu_name[] = {
 474         [CPU_SH7201]    = "SH7201",
 475         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 476         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 477         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 478         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 479         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 480         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 481         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 482         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 483         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 484         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 485         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 486         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 487         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 488         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 489         [CPU_SH7786]    = "SH7786",     [CPU_SH7757]    = "SH7757",
 490         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 491         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 492         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 493         [CPU_SH7366]    = "SH7366",     [CPU_SH7724]    = "SH7724",
 494         [CPU_SH_NONE]   = "Unknown"
 495 };
 496
 497 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 498 {
 499         return cpu_name[c->type];
 500 }
 501 EXPORT_SYMBOL(get_cpu_subtype);
 502
 503 #ifdef CONFIG_PROC_FS
 504 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 505 static const char *cpu_flags[] = {
 506         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 507         "ptea", "llsc", "l2", "op32", "pteaex", NULL
 508 };
 509
 510 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 511 {
 512         unsigned long i;
 513
 514         seq_printf(m, "cpu flags\t:");
 515
 516         if (!c->flags) {
 517                 seq_printf(m, " %s\n", cpu_flags[0]);
 518                 return;
 519         }
 520
 521         for (i = 0; cpu_flags[i]; i++)
 522                 if ((c->flags & (1 << i)))
 523                         seq_printf(m, " %s", cpu_flags[i+1]);
 524
 525         seq_printf(m, "\n");
 526 }
 527
 528 static void show_cacheinfo(struct seq_file *m, const char *type,
 529                            struct cache_info info)
 530 {
 531         unsigned int cache_size;
 532
 533         cache_size = info.ways * info.sets * info.linesz;
 534
 535         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 536                    type, cache_size >> 10, info.ways);
 537 }
 538
 539 /*
 540  *      Get CPU information for use by the procfs.
 541  */
 542 static int show_cpuinfo(struct seq_file *m, void *v)
 543 {
 544         struct sh_cpuinfo *c = v;
 545         unsigned int cpu = c - cpu_data;
 546
 547         if (!cpu_online(cpu))
 548                 return 0;
 549
 550         if (cpu == 0)
 551                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 552         else
 553                 seq_printf(m, "\n");
 554
 555         seq_printf(m, "processor\t: %d\n", cpu);
 556         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 557         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 558         if (c->cut_major == -1)
 559                 seq_printf(m, "cut\t\t: unknown\n");
 560         else if (c->cut_minor == -1)
 561                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 562         else
 563                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 564
 565         show_cpuflags(m, c);
 566
 567         seq_printf(m, "cache type\t: ");
 568
 569         /*
 570          * Check for what type of cache we have, we support both the
 571          * unified cache on the SH-2 and SH-3, as well as the harvard
 572          * style cache on the SH-4.
 573          */
 574         if (c->icache.flags & SH_CACHE_COMBINED) {
 575                 seq_printf(m, "unified\n");
 576                 show_cacheinfo(m, "cache", c->icache);
 577         } else {
 578                 seq_printf(m, "split (harvard)\n");
 579                 show_cacheinfo(m, "icache", c->icache);
 580                 show_cacheinfo(m, "dcache", c->dcache);
 581         }
 582
 583         /* Optional secondary cache */
 584         if (c->flags & CPU_HAS_L2_CACHE)
 585                 show_cacheinfo(m, "scache", c->scache);
 586
 587         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 588                      c->loops_per_jiffy/(500000/HZ),
 589                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 590
 591         return 0;
 592 }
 593
 594 static void *c_start(struct seq_file *m, loff_t *pos)
 595 {
 596         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 597 }
 598 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 599 {
 600         ++*pos;
 601         return c_start(m, pos);
 602 }
 603 static void c_stop(struct seq_file *m, void *v)
 604 {
 605 }
 606 const struct seq_operations cpuinfo_op = {
 607         .start  = c_start,
 608         .next   = c_next,
 609         .stop   = c_stop,
 610         .show   = show_cpuinfo,
 611 };
 612 #endif /* CONFIG_PROC_FS */
 613
 614 struct dentry *sh_debugfs_root;
 615
 616 static int __init sh_debugfs_init(void)
 617 {
 618         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 619         if (!sh_debugfs_root)
 620                 return -ENOMEM;
 621         if (IS_ERR(sh_debugfs_root))
 622                 return PTR_ERR(sh_debugfs_root);
 623
 624         return 0;
 625 }
 626 arch_initcall(sh_debugfs_init);