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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 <asm/uaccess.h>
  25 #include <asm/io.h>
  26 #include <asm/page.h>
  27 #include <asm/sections.h>
  28 #include <asm/irq.h>
  29 #include <asm/setup.h>
  30 #include <asm/clock.h>
  31 #include <asm/mmu_context.h>
  32
  33 extern void * __rd_start, * __rd_end;
  34
  35 /*
  36  * Machine setup..
  37  */
  38
  39 /*
  40  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  41  * This value will be used at the very early stage of serial setup.
  42  * The bigger value means no problem.
  43  */
  44 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  45 #ifdef CONFIG_VT
  46 struct screen_info screen_info;
  47 #endif
  48
  49 extern int root_mountflags;
  50
  51 /*
  52  * This is set up by the setup-routine at boot-time
  53  */
  54 #define PARAM   ((unsigned char *)empty_zero_page)
  55
  56 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  57 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  58 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  59 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  60 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  61 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  62 /* ... */
  63 #define COMMAND_LINE ((char *) (PARAM+0x100))
  64
  65 #define RAMDISK_IMAGE_START_MASK        0x07FF
  66 #define RAMDISK_PROMPT_FLAG             0x8000
  67 #define RAMDISK_LOAD_FLAG               0x4000
  68
  69 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  70
  71 static struct resource code_resource = { .name = "Kernel code", };
  72 static struct resource data_resource = { .name = "Kernel data", };
  73
  74 unsigned long memory_start, memory_end;
  75
  76 static int __init early_parse_mem(char *p)
  77 {
  78         unsigned long size;
  79
  80         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  81         size = memparse(p, &p);
  82         memory_end = memory_start + size;
  83
  84         return 0;
  85 }
  86 early_param("mem", early_parse_mem);
  87
  88 /*
  89  * Register fully available low RAM pages with the bootmem allocator.
  90  */
  91 static void __init register_bootmem_low_pages(void)
  92 {
  93         unsigned long curr_pfn, last_pfn, pages;
  94
  95         /*
  96          * We are rounding up the start address of usable memory:
  97          */
  98         curr_pfn = PFN_UP(__MEMORY_START);
  99
 100         /*
 101          * ... and at the end of the usable range downwards:
 102          */
 103         last_pfn = PFN_DOWN(__pa(memory_end));
 104
 105         if (last_pfn > max_low_pfn)
 106                 last_pfn = max_low_pfn;
 107
 108         pages = last_pfn - curr_pfn;
 109         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 110 }
 111
 112 void __init setup_bootmem_allocator(unsigned long start_pfn)
 113 {
 114         unsigned long bootmap_size;
 115
 116         /*
 117          * Find a proper area for the bootmem bitmap. After this
 118          * bootstrap step all allocations (until the page allocator
 119          * is intact) must be done via bootmem_alloc().
 120          */
 121         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 122                                          min_low_pfn, max_low_pfn);
 123
 124         register_bootmem_low_pages();
 125
 126         node_set_online(0);
 127
 128         /*
 129          * Reserve the kernel text and
 130          * Reserve the bootmem bitmap. We do this in two steps (first step
 131          * was init_bootmem()), because this catches the (definitely buggy)
 132          * case of us accidentally initializing the bootmem allocator with
 133          * an invalid RAM area.
 134          */
 135         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 136                 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 137
 138         /*
 139          * reserve physical page 0 - it's a special BIOS page on many boxes,
 140          * enabling clean reboots, SMP operation, laptop functions.
 141          */
 142         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 143
 144 #ifdef CONFIG_BLK_DEV_INITRD
 145         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 146         if (&__rd_start != &__rd_end) {
 147                 LOADER_TYPE = 1;
 148                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 149                                         __MEMORY_START;
 150                 INITRD_SIZE = (unsigned long)&__rd_end -
 151                               (unsigned long)&__rd_start;
 152         }
 153
 154         if (LOADER_TYPE && INITRD_START) {
 155                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 156                         reserve_bootmem(INITRD_START + __MEMORY_START,
 157                                         INITRD_SIZE);
 158                         initrd_start = INITRD_START + PAGE_OFFSET +
 159                                         __MEMORY_START;
 160                         initrd_end = initrd_start + INITRD_SIZE;
 161                 } else {
 162                         printk("initrd extends beyond end of memory "
 163                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 164                                     INITRD_START + INITRD_SIZE,
 165                                     max_low_pfn << PAGE_SHIFT);
 166                         initrd_start = 0;
 167                 }
 168         }
 169 #endif
 170 #ifdef CONFIG_KEXEC
 171         if (crashk_res.start != crashk_res.end)
 172                 reserve_bootmem(crashk_res.start,
 173                         crashk_res.end - crashk_res.start + 1);
 174 #endif
 175 }
 176
 177 #ifndef CONFIG_NEED_MULTIPLE_NODES
 178 static void __init setup_memory(void)
 179 {
 180         unsigned long start_pfn;
 181
 182         /*
 183          * Partially used pages are not usable - thus
 184          * we are rounding upwards:
 185          */
 186         start_pfn = PFN_UP(__pa(_end));
 187         setup_bootmem_allocator(start_pfn);
 188 }
 189 #else
 190 extern void __init setup_memory(void);
 191 #endif
 192
 193 void __init setup_arch(char **cmdline_p)
 194 {
 195         enable_mmu();
 196
 197         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 198
 199 #ifdef CONFIG_BLK_DEV_RAM
 200         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 201         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 202         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 203 #endif
 204
 205         if (!MOUNT_ROOT_RDONLY)
 206                 root_mountflags &= ~MS_RDONLY;
 207         init_mm.start_code = (unsigned long) _text;
 208         init_mm.end_code = (unsigned long) _etext;
 209         init_mm.end_data = (unsigned long) _edata;
 210         init_mm.brk = (unsigned long) _end;
 211
 212         code_resource.start = virt_to_phys(_text);
 213         code_resource.end = virt_to_phys(_etext)-1;
 214         data_resource.start = virt_to_phys(_etext);
 215         data_resource.end = virt_to_phys(_edata)-1;
 216
 217         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 218         memory_end = memory_start + __MEMORY_SIZE;
 219
 220 #ifdef CONFIG_CMDLINE_BOOL
 221         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 222 #else
 223         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 224 #endif
 225
 226         /* Save unparsed command line copy for /proc/cmdline */
 227         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 228         *cmdline_p = command_line;
 229
 230         parse_early_param();
 231
 232         sh_mv_setup();
 233
 234         /*
 235          * Find the highest page frame number we have available
 236          */
 237         max_pfn = PFN_DOWN(__pa(memory_end));
 238
 239         /*
 240          * Determine low and high memory ranges:
 241          */
 242         max_low_pfn = max_pfn;
 243         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 244
 245         nodes_clear(node_online_map);
 246         setup_memory();
 247         paging_init();
 248         sparse_init();
 249
 250 #ifdef CONFIG_DUMMY_CONSOLE
 251         conswitchp = &dummy_con;
 252 #endif
 253
 254         /* Perform the machine specific initialisation */
 255         if (likely(sh_mv.mv_setup))
 256                 sh_mv.mv_setup(cmdline_p);
 257 }
 258
 259
 260 static const char *cpu_name[] = {
 261         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 262         [CPU_SH7604]    = "SH7604",     [CPU_SH7300]    = "SH7300",
 263         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 264         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 265         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 266         [CPU_SH7712]    = "SH7712",
 267         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 268         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 269         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 270         [CPU_SH7760]    = "SH7760",     [CPU_SH73180]   = "SH73180",
 271         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 272         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 273         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 274         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 275         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 276         [CPU_SH_NONE]   = "Unknown"
 277 };
 278
 279 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 280 {
 281         return cpu_name[c->type];
 282 }
 283
 284 #ifdef CONFIG_PROC_FS
 285 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 286 static const char *cpu_flags[] = {
 287         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 288         "ptea", "llsc", "l2", "op32", NULL
 289 };
 290
 291 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 292 {
 293         unsigned long i;
 294
 295         seq_printf(m, "cpu flags\t:");
 296
 297         if (!c->flags) {
 298                 seq_printf(m, " %s\n", cpu_flags[0]);
 299                 return;
 300         }
 301
 302         for (i = 0; cpu_flags[i]; i++)
 303                 if ((c->flags & (1 << i)))
 304                         seq_printf(m, " %s", cpu_flags[i+1]);
 305
 306         seq_printf(m, "\n");
 307 }
 308
 309 static void show_cacheinfo(struct seq_file *m, const char *type,
 310                            struct cache_info info)
 311 {
 312         unsigned int cache_size;
 313
 314         cache_size = info.ways * info.sets * info.linesz;
 315
 316         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 317                    type, cache_size >> 10, info.ways);
 318 }
 319
 320 /*
 321  *      Get CPU information for use by the procfs.
 322  */
 323 static int show_cpuinfo(struct seq_file *m, void *v)
 324 {
 325         struct sh_cpuinfo *c = v;
 326         unsigned int cpu = c - cpu_data;
 327
 328         if (!cpu_online(cpu))
 329                 return 0;
 330
 331         if (cpu == 0)
 332                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 333
 334         seq_printf(m, "processor\t: %d\n", cpu);
 335         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 336         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 337
 338         show_cpuflags(m, c);
 339
 340         seq_printf(m, "cache type\t: ");
 341
 342         /*
 343          * Check for what type of cache we have, we support both the
 344          * unified cache on the SH-2 and SH-3, as well as the harvard
 345          * style cache on the SH-4.
 346          */
 347         if (c->icache.flags & SH_CACHE_COMBINED) {
 348                 seq_printf(m, "unified\n");
 349                 show_cacheinfo(m, "cache", c->icache);
 350         } else {
 351                 seq_printf(m, "split (harvard)\n");
 352                 show_cacheinfo(m, "icache", c->icache);
 353                 show_cacheinfo(m, "dcache", c->dcache);
 354         }
 355
 356         /* Optional secondary cache */
 357         if (c->flags & CPU_HAS_L2_CACHE)
 358                 show_cacheinfo(m, "scache", c->scache);
 359
 360         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 361                      c->loops_per_jiffy/(500000/HZ),
 362                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 363
 364         return 0;
 365 }
 366
 367 static void *c_start(struct seq_file *m, loff_t *pos)
 368 {
 369         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 370 }
 371 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 372 {
 373         ++*pos;
 374         return c_start(m, pos);
 375 }
 376 static void c_stop(struct seq_file *m, void *v)
 377 {
 378 }
 379 struct seq_operations cpuinfo_op = {
 380         .start  = c_start,
 381         .next   = c_next,
 382         .stop   = c_stop,
 383         .show   = show_cpuinfo,
 384 };
 385 #endif /* CONFIG_PROC_FS */