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 - 2010 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/crash_dump.h>
  28 #include <linux/mmzone.h>
  29 #include <linux/clk.h>
  30 #include <linux/delay.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/memblock.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/smp.h>
  42 #include <asm/mmu_context.h>
  43 #include <asm/mmzone.h>
  44 #include <asm/sparsemem.h>
  45
  46 /*
  47  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  48  * This value will be used at the very early stage of serial setup.
  49  * The bigger value means no problem.
  50  */
  51 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  52         [0] = {
  53                 .type                   = CPU_SH_NONE,
  54                 .family                 = CPU_FAMILY_UNKNOWN,
  55                 .loops_per_jiffy        = 10000000,
  56                 .phys_bits              = MAX_PHYSMEM_BITS,
  57         },
  58 };
  59 EXPORT_SYMBOL(cpu_data);
  60
  61 /*
  62  * The machine vector. First entry in .machvec.init, or clobbered by
  63  * sh_mv= on the command line, prior to .machvec.init teardown.
  64  */
  65 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  66 EXPORT_SYMBOL(sh_mv);
  67
  68 #ifdef CONFIG_VT
  69 struct screen_info screen_info;
  70 #endif
  71
  72 extern int root_mountflags;
  73
  74 #define RAMDISK_IMAGE_START_MASK        0x07FF
  75 #define RAMDISK_PROMPT_FLAG             0x8000
  76 #define RAMDISK_LOAD_FLAG               0x4000
  77
  78 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  79
  80 static struct resource code_resource = {
  81         .name = "Kernel code",
  82         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  83 };
  84
  85 static struct resource data_resource = {
  86         .name = "Kernel data",
  87         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  88 };
  89
  90 static struct resource bss_resource = {
  91         .name   = "Kernel bss",
  92         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  93 };
  94
  95 unsigned long memory_start;
  96 EXPORT_SYMBOL(memory_start);
  97 unsigned long memory_end = 0;
  98 EXPORT_SYMBOL(memory_end);
  99 unsigned long memory_limit = 0;
 100
 101 static struct resource mem_resources[MAX_NUMNODES];
 102
 103 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 104
 105 static int __init early_parse_mem(char *p)
 106 {
 107         if (!p)
 108                 return 1;
 109
 110         memory_limit = PAGE_ALIGN(memparse(p, &p));
 111
 112         pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
 113
 114         return 0;
 115 }
 116 early_param("mem", early_parse_mem);
 117
 118 void __init check_for_initrd(void)
 119 {
 120 #ifdef CONFIG_BLK_DEV_INITRD
 121         unsigned long start, end;
 122
 123         /*
 124          * Check for the rare cases where boot loaders adhere to the boot
 125          * ABI.
 126          */
 127         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 128                 goto disable;
 129
 130         start = INITRD_START + __MEMORY_START;
 131         end = start + INITRD_SIZE;
 132
 133         if (unlikely(end <= start))
 134                 goto disable;
 135         if (unlikely(start & ~PAGE_MASK)) {
 136                 pr_err("initrd must be page aligned\n");
 137                 goto disable;
 138         }
 139
 140         if (unlikely(start < __MEMORY_START)) {
 141                 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
 142                         start, __MEMORY_START);
 143                 goto disable;
 144         }
 145
 146         if (unlikely(end > memblock_end_of_DRAM())) {
 147                 pr_err("initrd extends beyond end of memory "
 148                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 149                        end, (unsigned long)memblock_end_of_DRAM());
 150                 goto disable;
 151         }
 152
 153         /*
 154          * If we got this far inspite of the boot loader's best efforts
 155          * to the contrary, assume we actually have a valid initrd and
 156          * fix up the root dev.
 157          */
 158         ROOT_DEV = Root_RAM0;
 159
 160         /*
 161          * Address sanitization
 162          */
 163         initrd_start = (unsigned long)__va(start);
 164         initrd_end = initrd_start + INITRD_SIZE;
 165
 166         memblock_reserve(__pa(initrd_start), INITRD_SIZE);
 167
 168         return;
 169
 170 disable:
 171         pr_info("initrd disabled\n");
 172         initrd_start = initrd_end = 0;
 173 #endif
 174 }
 175
 176 void __cpuinit calibrate_delay(void)
 177 {
 178         struct clk *clk = clk_get(NULL, "cpu_clk");
 179
 180         if (IS_ERR(clk))
 181                 panic("Need a sane CPU clock definition!");
 182
 183         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 184
 185         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 186                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 187                          loops_per_jiffy/(500000/HZ),
 188                          (loops_per_jiffy/(5000/HZ)) % 100,
 189                          loops_per_jiffy);
 190 }
 191
 192 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 193                                                 unsigned long end_pfn)
 194 {
 195         struct resource *res = &mem_resources[nid];
 196         unsigned long start, end;
 197
 198         WARN_ON(res->name); /* max one active range per node for now */
 199
 200         start = start_pfn << PAGE_SHIFT;
 201         end = end_pfn << PAGE_SHIFT;
 202
 203         res->name = "System RAM";
 204         res->start = start;
 205         res->end = end - 1;
 206         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 207
 208         if (request_resource(&iomem_resource, res)) {
 209                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 210                        start_pfn, end_pfn);
 211                 return;
 212         }
 213
 214         /*
 215          *  We don't know which RAM region contains kernel data,
 216          *  so we try it repeatedly and let the resource manager
 217          *  test it.
 218          */
 219         request_resource(res, &code_resource);
 220         request_resource(res, &data_resource);
 221         request_resource(res, &bss_resource);
 222
 223         /*
 224          * Also make sure that there is a PMB mapping that covers this
 225          * range before we attempt to activate it, to avoid reset by MMU.
 226          * We can hit this path with NUMA or memory hot-add.
 227          */
 228         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 229                          PAGE_KERNEL);
 230
 231         add_active_range(nid, start_pfn, end_pfn);
 232 }
 233
 234 void __init __weak plat_early_device_setup(void)
 235 {
 236 }
 237
 238 void __init setup_arch(char **cmdline_p)
 239 {
 240         enable_mmu();
 241
 242         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 243
 244         printk(KERN_NOTICE "Boot params:\n"
 245                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 246                            "... RAMDISK_FLAGS     - %08lx\n"
 247                            "... ORIG_ROOT_DEV     - %08lx\n"
 248                            "... LOADER_TYPE       - %08lx\n"
 249                            "... INITRD_START      - %08lx\n"
 250                            "... INITRD_SIZE       - %08lx\n",
 251                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 252                            ORIG_ROOT_DEV, LOADER_TYPE,
 253                            INITRD_START, INITRD_SIZE);
 254
 255 #ifdef CONFIG_BLK_DEV_RAM
 256         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 257         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 258         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 259 #endif
 260
 261         if (!MOUNT_ROOT_RDONLY)
 262                 root_mountflags &= ~MS_RDONLY;
 263         init_mm.start_code = (unsigned long) _text;
 264         init_mm.end_code = (unsigned long) _etext;
 265         init_mm.end_data = (unsigned long) _edata;
 266         init_mm.brk = (unsigned long) _end;
 267
 268         code_resource.start = virt_to_phys(_text);
 269         code_resource.end = virt_to_phys(_etext)-1;
 270         data_resource.start = virt_to_phys(_etext);
 271         data_resource.end = virt_to_phys(_edata)-1;
 272         bss_resource.start = virt_to_phys(__bss_start);
 273         bss_resource.end = virt_to_phys(_ebss)-1;
 274
 275 #ifdef CONFIG_CMDLINE_OVERWRITE
 276         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 277 #else
 278         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 279 #ifdef CONFIG_CMDLINE_EXTEND
 280         strlcat(command_line, " ", sizeof(command_line));
 281         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 282 #endif
 283 #endif
 284
 285         /* Save unparsed command line copy for /proc/cmdline */
 286         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 287         *cmdline_p = command_line;
 288
 289         parse_early_param();
 290
 291         plat_early_device_setup();
 292
 293         sh_mv_setup();
 294
 295         /* Let earlyprintk output early console messages */
 296         early_platform_driver_probe("earlyprintk", 1, 1);
 297
 298         paging_init();
 299
 300 #ifdef CONFIG_DUMMY_CONSOLE
 301         conswitchp = &dummy_con;
 302 #endif
 303
 304         /* Perform the machine specific initialisation */
 305         if (likely(sh_mv.mv_setup))
 306                 sh_mv.mv_setup(cmdline_p);
 307
 308         plat_smp_setup();
 309 }
 310
 311 /* processor boot mode configuration */
 312 int generic_mode_pins(void)
 313 {
 314         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 315         return 0;
 316 }
 317
 318 int test_mode_pin(int pin)
 319 {
 320         return sh_mv.mv_mode_pins() & pin;
 321 }
 322
 323 static const char *cpu_name[] = {
 324         [CPU_SH7201]    = "SH7201",
 325         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 326         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 327         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 328         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 329         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 330         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 331         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 332         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 333         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 334         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 335         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 336         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 337         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 338         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 339         [CPU_SH7786]    = "SH7786",     [CPU_SH7757]    = "SH7757",
 340         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 341         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 342         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 343         [CPU_SH7366]    = "SH7366",     [CPU_SH7724]    = "SH7724",
 344         [CPU_SH_NONE]   = "Unknown"
 345 };
 346
 347 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 348 {
 349         return cpu_name[c->type];
 350 }
 351 EXPORT_SYMBOL(get_cpu_subtype);
 352
 353 #ifdef CONFIG_PROC_FS
 354 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 355 static const char *cpu_flags[] = {
 356         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 357         "ptea", "llsc", "l2", "op32", "pteaex", NULL
 358 };
 359
 360 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 361 {
 362         unsigned long i;
 363
 364         seq_printf(m, "cpu flags\t:");
 365
 366         if (!c->flags) {
 367                 seq_printf(m, " %s\n", cpu_flags[0]);
 368                 return;
 369         }
 370
 371         for (i = 0; cpu_flags[i]; i++)
 372                 if ((c->flags & (1 << i)))
 373                         seq_printf(m, " %s", cpu_flags[i+1]);
 374
 375         seq_printf(m, "\n");
 376 }
 377
 378 static void show_cacheinfo(struct seq_file *m, const char *type,
 379                            struct cache_info info)
 380 {
 381         unsigned int cache_size;
 382
 383         cache_size = info.ways * info.sets * info.linesz;
 384
 385         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 386                    type, cache_size >> 10, info.ways);
 387 }
 388
 389 /*
 390  *      Get CPU information for use by the procfs.
 391  */
 392 static int show_cpuinfo(struct seq_file *m, void *v)
 393 {
 394         struct sh_cpuinfo *c = v;
 395         unsigned int cpu = c - cpu_data;
 396
 397         if (!cpu_online(cpu))
 398                 return 0;
 399
 400         if (cpu == 0)
 401                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 402         else
 403                 seq_printf(m, "\n");
 404
 405         seq_printf(m, "processor\t: %d\n", cpu);
 406         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 407         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 408         if (c->cut_major == -1)
 409                 seq_printf(m, "cut\t\t: unknown\n");
 410         else if (c->cut_minor == -1)
 411                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 412         else
 413                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 414
 415         show_cpuflags(m, c);
 416
 417         seq_printf(m, "cache type\t: ");
 418
 419         /*
 420          * Check for what type of cache we have, we support both the
 421          * unified cache on the SH-2 and SH-3, as well as the harvard
 422          * style cache on the SH-4.
 423          */
 424         if (c->icache.flags & SH_CACHE_COMBINED) {
 425                 seq_printf(m, "unified\n");
 426                 show_cacheinfo(m, "cache", c->icache);
 427         } else {
 428                 seq_printf(m, "split (harvard)\n");
 429                 show_cacheinfo(m, "icache", c->icache);
 430                 show_cacheinfo(m, "dcache", c->dcache);
 431         }
 432
 433         /* Optional secondary cache */
 434         if (c->flags & CPU_HAS_L2_CACHE)
 435                 show_cacheinfo(m, "scache", c->scache);
 436
 437         seq_printf(m, "address sizes\t: %u bits physical\n", c->phys_bits);
 438
 439         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 440                      c->loops_per_jiffy/(500000/HZ),
 441                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 442
 443         return 0;
 444 }
 445
 446 static void *c_start(struct seq_file *m, loff_t *pos)
 447 {
 448         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 449 }
 450 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 451 {
 452         ++*pos;
 453         return c_start(m, pos);
 454 }
 455 static void c_stop(struct seq_file *m, void *v)
 456 {
 457 }
 458 const struct seq_operations cpuinfo_op = {
 459         .start  = c_start,
 460         .next   = c_next,
 461         .stop   = c_stop,
 462         .show   = show_cpuinfo,
 463 };
 464 #endif /* CONFIG_PROC_FS */