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