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         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 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 189 void __cpuinit calibrate_delay(void)
 190 {
 191         struct clk *clk = clk_get(NULL, "cpu_clk");
 192
 193         if (IS_ERR(clk))
 194                 panic("Need a sane CPU clock definition!");
 195
 196         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 197
 198         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 199                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 200                          loops_per_jiffy/(500000/HZ),
 201                          (loops_per_jiffy/(5000/HZ)) % 100,
 202                          loops_per_jiffy);
 203 }
 204 #endif
 205
 206 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 207                                                 unsigned long end_pfn)
 208 {
 209         struct resource *res = &mem_resources[nid];
 210
 211         WARN_ON(res->name); /* max one active range per node for now */
 212
 213         res->name = "System RAM";
 214         res->start = start_pfn << PAGE_SHIFT;
 215         res->end = (end_pfn << PAGE_SHIFT) - 1;
 216         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 217         if (request_resource(&iomem_resource, res)) {
 218                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 219                        start_pfn, end_pfn);
 220                 return;
 221         }
 222
 223         /*
 224          *  We don't know which RAM region contains kernel data,
 225          *  so we try it repeatedly and let the resource manager
 226          *  test it.
 227          */
 228         request_resource(res, &code_resource);
 229         request_resource(res, &data_resource);
 230         request_resource(res, &bss_resource);
 231
 232         add_active_range(nid, start_pfn, end_pfn);
 233 }
 234
 235 void __init setup_bootmem_allocator(unsigned long free_pfn)
 236 {
 237         unsigned long bootmap_size;
 238
 239         /*
 240          * Find a proper area for the bootmem bitmap. After this
 241          * bootstrap step all allocations (until the page allocator
 242          * is intact) must be done via bootmem_alloc().
 243          */
 244         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 245                                          min_low_pfn, max_low_pfn);
 246
 247         __add_active_range(0, min_low_pfn, max_low_pfn);
 248         register_bootmem_low_pages();
 249
 250         node_set_online(0);
 251
 252         /*
 253          * Reserve the kernel text and
 254          * Reserve the bootmem bitmap. We do this in two steps (first step
 255          * was init_bootmem()), because this catches the (definitely buggy)
 256          * case of us accidentally initializing the bootmem allocator with
 257          * an invalid RAM area.
 258          */
 259         reserve_bootmem(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 260                         (PFN_PHYS(free_pfn) + bootmap_size + PAGE_SIZE - 1) -
 261                         (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET),
 262                         BOOTMEM_DEFAULT);
 263
 264         /*
 265          * reserve physical page 0 - it's a special BIOS page on many boxes,
 266          * enabling clean reboots, SMP operation, laptop functions.
 267          */
 268         reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
 269                         BOOTMEM_DEFAULT);
 270
 271         sparse_memory_present_with_active_regions(0);
 272
 273 #ifdef CONFIG_BLK_DEV_INITRD
 274         ROOT_DEV = Root_RAM0;
 275
 276         if (LOADER_TYPE && INITRD_START) {
 277                 unsigned long initrd_start_phys = INITRD_START + __MEMORY_START;
 278
 279                 if (initrd_start_phys + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 280                         reserve_bootmem(initrd_start_phys, INITRD_SIZE,
 281                                         BOOTMEM_DEFAULT);
 282                         initrd_start = (unsigned long)__va(initrd_start_phys);
 283                         initrd_end = initrd_start + INITRD_SIZE;
 284                 } else {
 285                         printk("initrd extends beyond end of memory "
 286                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 287                                initrd_start_phys + INITRD_SIZE,
 288                                (unsigned long)PFN_PHYS(max_low_pfn));
 289                         initrd_start = 0;
 290                 }
 291         }
 292 #endif
 293
 294         reserve_crashkernel();
 295 }
 296
 297 #ifndef CONFIG_NEED_MULTIPLE_NODES
 298 static void __init setup_memory(void)
 299 {
 300         unsigned long start_pfn;
 301
 302         /*
 303          * Partially used pages are not usable - thus
 304          * we are rounding upwards:
 305          */
 306         start_pfn = PFN_UP(__pa(_end));
 307         setup_bootmem_allocator(start_pfn);
 308 }
 309 #else
 310 extern void __init setup_memory(void);
 311 #endif
 312
 313 /*
 314  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 315  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 316  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 317  */
 318 #ifdef CONFIG_CRASH_DUMP
 319 /* elfcorehdr= specifies the location of elf core header
 320  * stored by the crashed kernel.
 321  */
 322 static int __init parse_elfcorehdr(char *arg)
 323 {
 324         if (!arg)
 325                 return -EINVAL;
 326         elfcorehdr_addr = memparse(arg, &arg);
 327         return 0;
 328 }
 329 early_param("elfcorehdr", parse_elfcorehdr);
 330 #endif
 331
 332 void __init setup_arch(char **cmdline_p)
 333 {
 334         enable_mmu();
 335
 336         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 337
 338         printk(KERN_NOTICE "Boot params:\n"
 339                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 340                            "... RAMDISK_FLAGS     - %08lx\n"
 341                            "... ORIG_ROOT_DEV     - %08lx\n"
 342                            "... LOADER_TYPE       - %08lx\n"
 343                            "... INITRD_START      - %08lx\n"
 344                            "... INITRD_SIZE       - %08lx\n",
 345                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 346                            ORIG_ROOT_DEV, LOADER_TYPE,
 347                            INITRD_START, INITRD_SIZE);
 348
 349 #ifdef CONFIG_BLK_DEV_RAM
 350         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 351         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 352         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 353 #endif
 354
 355         if (!MOUNT_ROOT_RDONLY)
 356                 root_mountflags &= ~MS_RDONLY;
 357         init_mm.start_code = (unsigned long) _text;
 358         init_mm.end_code = (unsigned long) _etext;
 359         init_mm.end_data = (unsigned long) _edata;
 360         init_mm.brk = (unsigned long) _end;
 361
 362         code_resource.start = virt_to_phys(_text);
 363         code_resource.end = virt_to_phys(_etext)-1;
 364         data_resource.start = virt_to_phys(_etext);
 365         data_resource.end = virt_to_phys(_edata)-1;
 366         bss_resource.start = virt_to_phys(__bss_start);
 367         bss_resource.end = virt_to_phys(_ebss)-1;
 368
 369         memory_start = (unsigned long)__va(__MEMORY_START);
 370         if (!memory_end)
 371                 memory_end = memory_start + __MEMORY_SIZE;
 372
 373 #ifdef CONFIG_CMDLINE_BOOL
 374         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 375 #else
 376         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 377 #endif
 378
 379         /* Save unparsed command line copy for /proc/cmdline */
 380         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 381         *cmdline_p = command_line;
 382
 383         parse_early_param();
 384
 385         sh_mv_setup();
 386
 387         /*
 388          * Find the highest page frame number we have available
 389          */
 390         max_pfn = PFN_DOWN(__pa(memory_end));
 391
 392         /*
 393          * Determine low and high memory ranges:
 394          */
 395         max_low_pfn = max_pfn;
 396         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 397
 398         nodes_clear(node_online_map);
 399
 400         /* Setup bootmem with available RAM */
 401         setup_memory();
 402         sparse_init();
 403
 404 #ifdef CONFIG_DUMMY_CONSOLE
 405         conswitchp = &dummy_con;
 406 #endif
 407
 408         /* Perform the machine specific initialisation */
 409         if (likely(sh_mv.mv_setup))
 410                 sh_mv.mv_setup(cmdline_p);
 411
 412         paging_init();
 413
 414 #ifdef CONFIG_SMP
 415         plat_smp_setup();
 416 #endif
 417 }
 418
 419 static const char *cpu_name[] = {
 420         [CPU_SH7201]    = "SH7201",
 421         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 422         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 423         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 424         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 425         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 426         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 427         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 428         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 429         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 430         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 431         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 432         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 433         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 434         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 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", 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);