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/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 #include <asm/mmzone.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         },
  57 };
  58 EXPORT_SYMBOL(cpu_data);
  59
  60 /*
  61  * The machine vector. First entry in .machvec.init, or clobbered by
  62  * sh_mv= on the command line, prior to .machvec.init teardown.
  63  */
  64 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  65 EXPORT_SYMBOL(sh_mv);
  66
  67 #ifdef CONFIG_VT
  68 struct screen_info screen_info;
  69 #endif
  70
  71 extern int root_mountflags;
  72
  73 #define RAMDISK_IMAGE_START_MASK        0x07FF
  74 #define RAMDISK_PROMPT_FLAG             0x8000
  75 #define RAMDISK_LOAD_FLAG               0x4000
  76
  77 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  78
  79 static struct resource code_resource = {
  80         .name = "Kernel code",
  81         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  82 };
  83
  84 static struct resource data_resource = {
  85         .name = "Kernel data",
  86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 static struct resource bss_resource = {
  90         .name   = "Kernel bss",
  91         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  92 };
  93
  94 unsigned long memory_start;
  95 EXPORT_SYMBOL(memory_start);
  96 unsigned long memory_end = 0;
  97 EXPORT_SYMBOL(memory_end);
  98 unsigned long memory_limit = 0;
  99
 100 static struct resource mem_resources[MAX_NUMNODES];
 101
 102 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 103
 104 static int __init early_parse_mem(char *p)
 105 {
 106         if (!p)
 107                 return 1;
 108
 109         memory_limit = PAGE_ALIGN(memparse(p, &p));
 110
 111         pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
 112
 113         return 0;
 114 }
 115 early_param("mem", early_parse_mem);
 116
 117 void __init check_for_initrd(void)
 118 {
 119 #ifdef CONFIG_BLK_DEV_INITRD
 120         unsigned long start, end;
 121
 122         /*
 123          * Check for the rare cases where boot loaders adhere to the boot
 124          * ABI.
 125          */
 126         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 127                 goto disable;
 128
 129         start = INITRD_START + __MEMORY_START;
 130         end = start + INITRD_SIZE;
 131
 132         if (unlikely(end <= start))
 133                 goto disable;
 134         if (unlikely(start & ~PAGE_MASK)) {
 135                 pr_err("initrd must be page aligned\n");
 136                 goto disable;
 137         }
 138
 139         if (unlikely(start < PAGE_OFFSET)) {
 140                 pr_err("initrd start < PAGE_OFFSET\n");
 141                 goto disable;
 142         }
 143
 144         if (unlikely(end > lmb_end_of_DRAM())) {
 145                 pr_err("initrd extends beyond end of memory "
 146                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 147                        end, (unsigned long)lmb_end_of_DRAM());
 148                 goto disable;
 149         }
 150
 151         /*
 152          * If we got this far inspite of the boot loader's best efforts
 153          * to the contrary, assume we actually have a valid initrd and
 154          * fix up the root dev.
 155          */
 156         ROOT_DEV = Root_RAM0;
 157
 158         /*
 159          * Address sanitization
 160          */
 161         initrd_start = (unsigned long)__va(__pa(start));
 162         initrd_end = initrd_start + INITRD_SIZE;
 163
 164         lmb_reserve(__pa(initrd_start), INITRD_SIZE);
 165
 166         return;
 167
 168 disable:
 169         pr_info("initrd disabled\n");
 170         initrd_start = initrd_end = 0;
 171 #endif
 172 }
 173
 174 void __cpuinit calibrate_delay(void)
 175 {
 176         struct clk *clk = clk_get(NULL, "cpu_clk");
 177
 178         if (IS_ERR(clk))
 179                 panic("Need a sane CPU clock definition!");
 180
 181         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 182
 183         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 184                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 185                          loops_per_jiffy/(500000/HZ),
 186                          (loops_per_jiffy/(5000/HZ)) % 100,
 187                          loops_per_jiffy);
 188 }
 189
 190 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 191                                                 unsigned long end_pfn)
 192 {
 193         struct resource *res = &mem_resources[nid];
 194         unsigned long start, end;
 195
 196         WARN_ON(res->name); /* max one active range per node for now */
 197
 198         start = start_pfn << PAGE_SHIFT;
 199         end = end_pfn << PAGE_SHIFT;
 200
 201         res->name = "System RAM";
 202         res->start = start;
 203         res->end = end - 1;
 204         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 205
 206         if (request_resource(&iomem_resource, res)) {
 207                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 208                        start_pfn, end_pfn);
 209                 return;
 210         }
 211
 212         /*
 213          *  We don't know which RAM region contains kernel data,
 214          *  so we try it repeatedly and let the resource manager
 215          *  test it.
 216          */
 217         request_resource(res, &code_resource);
 218         request_resource(res, &data_resource);
 219         request_resource(res, &bss_resource);
 220
 221         /*
 222          * Also make sure that there is a PMB mapping that covers this
 223          * range before we attempt to activate it, to avoid reset by MMU.
 224          * We can hit this path with NUMA or memory hot-add.
 225          */
 226         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 227                          PAGE_KERNEL);
 228
 229         add_active_range(nid, start_pfn, end_pfn);
 230 }
 231
 232 void __init __weak plat_early_device_setup(void)
 233 {
 234 }
 235
 236 void __init setup_arch(char **cmdline_p)
 237 {
 238         enable_mmu();
 239
 240         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 241
 242         printk(KERN_NOTICE "Boot params:\n"
 243                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 244                            "... RAMDISK_FLAGS     - %08lx\n"
 245                            "... ORIG_ROOT_DEV     - %08lx\n"
 246                            "... LOADER_TYPE       - %08lx\n"
 247                            "... INITRD_START      - %08lx\n"
 248                            "... INITRD_SIZE       - %08lx\n",
 249                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 250                            ORIG_ROOT_DEV, LOADER_TYPE,
 251                            INITRD_START, INITRD_SIZE);
 252
 253 #ifdef CONFIG_BLK_DEV_RAM
 254         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 255         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 256         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 257 #endif
 258
 259         if (!MOUNT_ROOT_RDONLY)
 260                 root_mountflags &= ~MS_RDONLY;
 261         init_mm.start_code = (unsigned long) _text;
 262         init_mm.end_code = (unsigned long) _etext;
 263         init_mm.end_data = (unsigned long) _edata;
 264         init_mm.brk = (unsigned long) _end;
 265
 266         code_resource.start = virt_to_phys(_text);
 267         code_resource.end = virt_to_phys(_etext)-1;
 268         data_resource.start = virt_to_phys(_etext);
 269         data_resource.end = virt_to_phys(_edata)-1;
 270         bss_resource.start = virt_to_phys(__bss_start);
 271         bss_resource.end = virt_to_phys(_ebss)-1;
 272
 273 #ifdef CONFIG_CMDLINE_OVERWRITE
 274         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 275 #else
 276         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 277 #ifdef CONFIG_CMDLINE_EXTEND
 278         strlcat(command_line, " ", sizeof(command_line));
 279         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 280 #endif
 281 #endif
 282
 283         /* Save unparsed command line copy for /proc/cmdline */
 284         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 285         *cmdline_p = command_line;
 286
 287         parse_early_param();
 288
 289         plat_early_device_setup();
 290
 291         sh_mv_setup();
 292
 293         /* Let earlyprintk output early console messages */
 294         early_platform_driver_probe("earlyprintk", 1, 1);
 295
 296         paging_init();
 297
 298 #ifdef CONFIG_DUMMY_CONSOLE
 299         conswitchp = &dummy_con;
 300 #endif
 301
 302         /* Perform the machine specific initialisation */
 303         if (likely(sh_mv.mv_setup))
 304                 sh_mv.mv_setup(cmdline_p);
 305
 306         plat_smp_setup();
 307 }
 308
 309 /* processor boot mode configuration */
 310 int generic_mode_pins(void)
 311 {
 312         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 313         return 0;
 314 }
 315
 316 int test_mode_pin(int pin)
 317 {
 318         return sh_mv.mv_mode_pins() & pin;
 319 }
 320
 321 static const char *cpu_name[] = {
 322         [CPU_SH7201]    = "SH7201",
 323         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 324         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 325         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 326         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 327         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 328         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 329         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 330         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 331         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 332         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 333         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 334         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 335         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 336         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 337         [CPU_SH7786]    = "SH7786",     [CPU_SH7757]    = "SH7757",
 338         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 339         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 340         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 341         [CPU_SH7366]    = "SH7366",     [CPU_SH7724]    = "SH7724",
 342         [CPU_SH_NONE]   = "Unknown"
 343 };
 344
 345 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 346 {
 347         return cpu_name[c->type];
 348 }
 349 EXPORT_SYMBOL(get_cpu_subtype);
 350
 351 #ifdef CONFIG_PROC_FS
 352 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 353 static const char *cpu_flags[] = {
 354         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 355         "ptea", "llsc", "l2", "op32", "pteaex", NULL
 356 };
 357
 358 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 359 {
 360         unsigned long i;
 361
 362         seq_printf(m, "cpu flags\t:");
 363
 364         if (!c->flags) {
 365                 seq_printf(m, " %s\n", cpu_flags[0]);
 366                 return;
 367         }
 368
 369         for (i = 0; cpu_flags[i]; i++)
 370                 if ((c->flags & (1 << i)))
 371                         seq_printf(m, " %s", cpu_flags[i+1]);
 372
 373         seq_printf(m, "\n");
 374 }
 375
 376 static void show_cacheinfo(struct seq_file *m, const char *type,
 377                            struct cache_info info)
 378 {
 379         unsigned int cache_size;
 380
 381         cache_size = info.ways * info.sets * info.linesz;
 382
 383         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 384                    type, cache_size >> 10, info.ways);
 385 }
 386
 387 /*
 388  *      Get CPU information for use by the procfs.
 389  */
 390 static int show_cpuinfo(struct seq_file *m, void *v)
 391 {
 392         struct sh_cpuinfo *c = v;
 393         unsigned int cpu = c - cpu_data;
 394
 395         if (!cpu_online(cpu))
 396                 return 0;
 397
 398         if (cpu == 0)
 399                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 400         else
 401                 seq_printf(m, "\n");
 402
 403         seq_printf(m, "processor\t: %d\n", cpu);
 404         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 405         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 406         if (c->cut_major == -1)
 407                 seq_printf(m, "cut\t\t: unknown\n");
 408         else if (c->cut_minor == -1)
 409                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 410         else
 411                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 412
 413         show_cpuflags(m, c);
 414
 415         seq_printf(m, "cache type\t: ");
 416
 417         /*
 418          * Check for what type of cache we have, we support both the
 419          * unified cache on the SH-2 and SH-3, as well as the harvard
 420          * style cache on the SH-4.
 421          */
 422         if (c->icache.flags & SH_CACHE_COMBINED) {
 423                 seq_printf(m, "unified\n");
 424                 show_cacheinfo(m, "cache", c->icache);
 425         } else {
 426                 seq_printf(m, "split (harvard)\n");
 427                 show_cacheinfo(m, "icache", c->icache);
 428                 show_cacheinfo(m, "dcache", c->dcache);
 429         }
 430
 431         /* Optional secondary cache */
 432         if (c->flags & CPU_HAS_L2_CACHE)
 433                 show_cacheinfo(m, "scache", c->scache);
 434
 435         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 436                      c->loops_per_jiffy/(500000/HZ),
 437                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 438
 439         return 0;
 440 }
 441
 442 static void *c_start(struct seq_file *m, loff_t *pos)
 443 {
 444         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 445 }
 446 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 447 {
 448         ++*pos;
 449         return c_start(m, pos);
 450 }
 451 static void c_stop(struct seq_file *m, void *v)
 452 {
 453 }
 454 const struct seq_operations cpuinfo_op = {
 455         .start  = c_start,
 456         .next   = c_next,
 457         .stop   = c_stop,
 458         .show   = show_cpuinfo,
 459 };
 460 #endif /* CONFIG_PROC_FS */
 461
 462 struct dentry *sh_debugfs_root;
 463
 464 static int __init sh_debugfs_init(void)
 465 {
 466         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 467         if (!sh_debugfs_root)
 468                 return -ENOMEM;
 469         if (IS_ERR(sh_debugfs_root))
 470                 return PTR_ERR(sh_debugfs_root);
 471
 472         return 0;
 473 }
 474 arch_initcall(sh_debugfs_init);