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   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 <asm/uaccess.h>
  27 #include <asm/io.h>
  28 #include <asm/page.h>
  29 #include <asm/sections.h>
  30 #include <asm/irq.h>
  31 #include <asm/setup.h>
  32 #include <asm/clock.h>
  33 #include <asm/mmu_context.h>
  34
  35 /*
  36  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  37  * This value will be used at the very early stage of serial setup.
  38  * The bigger value means no problem.
  39  */
  40 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  41         [0] = {
  42                 .type                   = CPU_SH_NONE,
  43                 .loops_per_jiffy        = 10000000,
  44         },
  45 };
  46 EXPORT_SYMBOL(cpu_data);
  47
  48 /*
  49  * The machine vector. First entry in .machvec.init, or clobbered by
  50  * sh_mv= on the command line, prior to .machvec.init teardown.
  51  */
  52 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  53
  54 #ifdef CONFIG_VT
  55 struct screen_info screen_info;
  56 #endif
  57
  58 extern int root_mountflags;
  59
  60 #define RAMDISK_IMAGE_START_MASK        0x07FF
  61 #define RAMDISK_PROMPT_FLAG             0x8000
  62 #define RAMDISK_LOAD_FLAG               0x4000
  63
  64 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  65
  66 static struct resource code_resource = {
  67         .name = "Kernel code",
  68         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  69 };
  70
  71 static struct resource data_resource = {
  72         .name = "Kernel data",
  73         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  74 };
  75
  76 unsigned long memory_start;
  77 EXPORT_SYMBOL(memory_start);
  78 unsigned long memory_end = 0;
  79 EXPORT_SYMBOL(memory_end);
  80
  81 static int __init early_parse_mem(char *p)
  82 {
  83         unsigned long size;
  84
  85         memory_start = (unsigned long)__va(__MEMORY_START);
  86         size = memparse(p, &p);
  87
  88         if (size > __MEMORY_SIZE) {
  89                 static char msg[] __initdata = KERN_ERR
  90                         "Using mem= to increase the size of kernel memory "
  91                         "is not allowed.\n"
  92                         "  Recompile the kernel with the correct value for "
  93                         "CONFIG_MEMORY_SIZE.\n";
  94                 printk(msg);
  95                 return 0;
  96         }
  97
  98         memory_end = memory_start + size;
  99
 100         return 0;
 101 }
 102 early_param("mem", early_parse_mem);
 103
 104 /*
 105  * Register fully available low RAM pages with the bootmem allocator.
 106  */
 107 static void __init register_bootmem_low_pages(void)
 108 {
 109         unsigned long curr_pfn, last_pfn, pages;
 110
 111         /*
 112          * We are rounding up the start address of usable memory:
 113          */
 114         curr_pfn = PFN_UP(__MEMORY_START);
 115
 116         /*
 117          * ... and at the end of the usable range downwards:
 118          */
 119         last_pfn = PFN_DOWN(__pa(memory_end));
 120
 121         if (last_pfn > max_low_pfn)
 122                 last_pfn = max_low_pfn;
 123
 124         pages = last_pfn - curr_pfn;
 125         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 126 }
 127
 128 #ifdef CONFIG_KEXEC
 129 static void __init reserve_crashkernel(void)
 130 {
 131         unsigned long long free_mem;
 132         unsigned long long crash_size, crash_base;
 133         int ret;
 134
 135         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 136
 137         ret = parse_crashkernel(boot_command_line, free_mem,
 138                         &crash_size, &crash_base);
 139         if (ret == 0 && crash_size) {
 140                 if (crash_base > 0) {
 141                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 142                                         "for crashkernel (System RAM: %ldMB)\n",
 143                                         (unsigned long)(crash_size >> 20),
 144                                         (unsigned long)(crash_base >> 20),
 145                                         (unsigned long)(free_mem >> 20));
 146                         crashk_res.start = crash_base;
 147                         crashk_res.end   = crash_base + crash_size - 1;
 148                         reserve_bootmem(crash_base, crash_size);
 149                 } else
 150                         printk(KERN_INFO "crashkernel reservation failed - "
 151                                         "you have to specify a base address\n");
 152         }
 153 }
 154 #else
 155 static inline void __init reserve_crashkernel(void)
 156 {}
 157 #endif
 158
 159 void __init setup_bootmem_allocator(unsigned long free_pfn)
 160 {
 161         unsigned long bootmap_size;
 162
 163         /*
 164          * Find a proper area for the bootmem bitmap. After this
 165          * bootstrap step all allocations (until the page allocator
 166          * is intact) must be done via bootmem_alloc().
 167          */
 168         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 169                                          min_low_pfn, max_low_pfn);
 170
 171         add_active_range(0, min_low_pfn, max_low_pfn);
 172         register_bootmem_low_pages();
 173
 174         node_set_online(0);
 175
 176         /*
 177          * Reserve the kernel text and
 178          * Reserve the bootmem bitmap. We do this in two steps (first step
 179          * was init_bootmem()), because this catches the (definitely buggy)
 180          * case of us accidentally initializing the bootmem allocator with
 181          * an invalid RAM area.
 182          */
 183         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 184                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 185
 186         /*
 187          * reserve physical page 0 - it's a special BIOS page on many boxes,
 188          * enabling clean reboots, SMP operation, laptop functions.
 189          */
 190         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 191
 192         sparse_memory_present_with_active_regions(0);
 193
 194 #ifdef CONFIG_BLK_DEV_INITRD
 195         ROOT_DEV = Root_RAM0;
 196
 197         if (LOADER_TYPE && INITRD_START) {
 198                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 199                         reserve_bootmem(INITRD_START + __MEMORY_START,
 200                                         INITRD_SIZE);
 201                         initrd_start = INITRD_START + PAGE_OFFSET +
 202                                         __MEMORY_START;
 203                         initrd_end = initrd_start + INITRD_SIZE;
 204                 } else {
 205                         printk("initrd extends beyond end of memory "
 206                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 207                                     INITRD_START + INITRD_SIZE,
 208                                     max_low_pfn << PAGE_SHIFT);
 209                         initrd_start = 0;
 210                 }
 211         }
 212 #endif
 213
 214         reserve_crashkernel();
 215 }
 216
 217 #ifndef CONFIG_NEED_MULTIPLE_NODES
 218 static void __init setup_memory(void)
 219 {
 220         unsigned long start_pfn;
 221
 222         /*
 223          * Partially used pages are not usable - thus
 224          * we are rounding upwards:
 225          */
 226         start_pfn = PFN_UP(__pa(_end));
 227         setup_bootmem_allocator(start_pfn);
 228 }
 229 #else
 230 extern void __init setup_memory(void);
 231 #endif
 232
 233 void __init setup_arch(char **cmdline_p)
 234 {
 235         enable_mmu();
 236
 237         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 238
 239 #ifdef CONFIG_BLK_DEV_RAM
 240         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 241         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 242         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 243 #endif
 244
 245         if (!MOUNT_ROOT_RDONLY)
 246                 root_mountflags &= ~MS_RDONLY;
 247         init_mm.start_code = (unsigned long) _text;
 248         init_mm.end_code = (unsigned long) _etext;
 249         init_mm.end_data = (unsigned long) _edata;
 250         init_mm.brk = (unsigned long) _end;
 251
 252         code_resource.start = virt_to_phys(_text);
 253         code_resource.end = virt_to_phys(_etext)-1;
 254         data_resource.start = virt_to_phys(_etext);
 255         data_resource.end = virt_to_phys(_edata)-1;
 256
 257         memory_start = (unsigned long)__va(__MEMORY_START);
 258         if (!memory_end)
 259                 memory_end = memory_start + __MEMORY_SIZE;
 260
 261 #ifdef CONFIG_CMDLINE_BOOL
 262         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 263 #else
 264         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 265 #endif
 266
 267         /* Save unparsed command line copy for /proc/cmdline */
 268         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 269         *cmdline_p = command_line;
 270
 271         parse_early_param();
 272
 273         sh_mv_setup();
 274
 275         /*
 276          * Find the highest page frame number we have available
 277          */
 278         max_pfn = PFN_DOWN(__pa(memory_end));
 279
 280         /*
 281          * Determine low and high memory ranges:
 282          */
 283         max_low_pfn = max_pfn;
 284         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 285
 286         nodes_clear(node_online_map);
 287
 288         /* Setup bootmem with available RAM */
 289         setup_memory();
 290         sparse_init();
 291
 292 #ifdef CONFIG_DUMMY_CONSOLE
 293         conswitchp = &dummy_con;
 294 #endif
 295
 296         /* Perform the machine specific initialisation */
 297         if (likely(sh_mv.mv_setup))
 298                 sh_mv.mv_setup(cmdline_p);
 299
 300         paging_init();
 301
 302 #ifdef CONFIG_SMP
 303         plat_smp_setup();
 304 #endif
 305 }
 306
 307 static const char *cpu_name[] = {
 308         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 309         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 310         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 311         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 312         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 313         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 314         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 315         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 316         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 317         [CPU_SH7760]    = "SH7760",
 318         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 319         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 320         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 321         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 322         [CPU_SHX3]      = "SH-X3",
 323         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 324         [CPU_SH_NONE]   = "Unknown"
 325 };
 326
 327 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 328 {
 329         return cpu_name[c->type];
 330 }
 331
 332 #ifdef CONFIG_PROC_FS
 333 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 334 static const char *cpu_flags[] = {
 335         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 336         "ptea", "llsc", "l2", "op32", NULL
 337 };
 338
 339 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 340 {
 341         unsigned long i;
 342
 343         seq_printf(m, "cpu flags\t:");
 344
 345         if (!c->flags) {
 346                 seq_printf(m, " %s\n", cpu_flags[0]);
 347                 return;
 348         }
 349
 350         for (i = 0; cpu_flags[i]; i++)
 351                 if ((c->flags & (1 << i)))
 352                         seq_printf(m, " %s", cpu_flags[i+1]);
 353
 354         seq_printf(m, "\n");
 355 }
 356
 357 static void show_cacheinfo(struct seq_file *m, const char *type,
 358                            struct cache_info info)
 359 {
 360         unsigned int cache_size;
 361
 362         cache_size = info.ways * info.sets * info.linesz;
 363
 364         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 365                    type, cache_size >> 10, info.ways);
 366 }
 367
 368 /*
 369  *      Get CPU information for use by the procfs.
 370  */
 371 static int show_cpuinfo(struct seq_file *m, void *v)
 372 {
 373         struct sh_cpuinfo *c = v;
 374         unsigned int cpu = c - cpu_data;
 375
 376         if (!cpu_online(cpu))
 377                 return 0;
 378
 379         if (cpu == 0)
 380                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 381
 382         seq_printf(m, "processor\t: %d\n", cpu);
 383         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 384         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 385
 386         show_cpuflags(m, c);
 387
 388         seq_printf(m, "cache type\t: ");
 389
 390         /*
 391          * Check for what type of cache we have, we support both the
 392          * unified cache on the SH-2 and SH-3, as well as the harvard
 393          * style cache on the SH-4.
 394          */
 395         if (c->icache.flags & SH_CACHE_COMBINED) {
 396                 seq_printf(m, "unified\n");
 397                 show_cacheinfo(m, "cache", c->icache);
 398         } else {
 399                 seq_printf(m, "split (harvard)\n");
 400                 show_cacheinfo(m, "icache", c->icache);
 401                 show_cacheinfo(m, "dcache", c->dcache);
 402         }
 403
 404         /* Optional secondary cache */
 405         if (c->flags & CPU_HAS_L2_CACHE)
 406                 show_cacheinfo(m, "scache", c->scache);
 407
 408         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 409                      c->loops_per_jiffy/(500000/HZ),
 410                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 411
 412         return 0;
 413 }
 414
 415 static void *c_start(struct seq_file *m, loff_t *pos)
 416 {
 417         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 418 }
 419 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 420 {
 421         ++*pos;
 422         return c_start(m, pos);
 423 }
 424 static void c_stop(struct seq_file *m, void *v)
 425 {
 426 }
 427 struct seq_operations cpuinfo_op = {
 428         .start  = c_start,
 429         .next   = c_next,
 430         .stop   = c_stop,
 431         .show   = show_cpuinfo,
 432 };
 433 #endif /* CONFIG_PROC_FS */