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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
  46 /*
  47  * The machine vector. First entry in .machvec.init, or clobbered by
  48  * sh_mv= on the command line, prior to .machvec.init teardown.
  49  */
  50 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  51
  52 #ifdef CONFIG_VT
  53 struct screen_info screen_info;
  54 #endif
  55
  56 extern int root_mountflags;
  57
  58 /*
  59  * This is set up by the setup-routine at boot-time
  60  */
  61 #define PARAM   ((unsigned char *)empty_zero_page)
  62
  63 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  64 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  65 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  66 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  67 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  68 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  69 /* ... */
  70 #define COMMAND_LINE ((char *) (PARAM+0x100))
  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 = { .name = "Kernel code", };
  79 static struct resource data_resource = { .name = "Kernel data", };
  80
  81 unsigned long memory_start, memory_end;
  82
  83 static int __init early_parse_mem(char *p)
  84 {
  85         unsigned long size;
  86
  87         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  88         size = memparse(p, &p);
  89         memory_end = memory_start + size;
  90
  91         return 0;
  92 }
  93 early_param("mem", early_parse_mem);
  94
  95 /*
  96  * Register fully available low RAM pages with the bootmem allocator.
  97  */
  98 static void __init register_bootmem_low_pages(void)
  99 {
 100         unsigned long curr_pfn, last_pfn, pages;
 101
 102         /*
 103          * We are rounding up the start address of usable memory:
 104          */
 105         curr_pfn = PFN_UP(__MEMORY_START);
 106
 107         /*
 108          * ... and at the end of the usable range downwards:
 109          */
 110         last_pfn = PFN_DOWN(__pa(memory_end));
 111
 112         if (last_pfn > max_low_pfn)
 113                 last_pfn = max_low_pfn;
 114
 115         pages = last_pfn - curr_pfn;
 116         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 117 }
 118
 119 void __init setup_bootmem_allocator(unsigned long free_pfn)
 120 {
 121         unsigned long bootmap_size;
 122
 123         /*
 124          * Find a proper area for the bootmem bitmap. After this
 125          * bootstrap step all allocations (until the page allocator
 126          * is intact) must be done via bootmem_alloc().
 127          */
 128         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 129                                          min_low_pfn, max_low_pfn);
 130
 131         add_active_range(0, min_low_pfn, max_low_pfn);
 132         register_bootmem_low_pages();
 133
 134         node_set_online(0);
 135
 136         /*
 137          * Reserve the kernel text and
 138          * Reserve the bootmem bitmap. We do this in two steps (first step
 139          * was init_bootmem()), because this catches the (definitely buggy)
 140          * case of us accidentally initializing the bootmem allocator with
 141          * an invalid RAM area.
 142          */
 143         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 144                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 145
 146         /*
 147          * reserve physical page 0 - it's a special BIOS page on many boxes,
 148          * enabling clean reboots, SMP operation, laptop functions.
 149          */
 150         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 151
 152         sparse_memory_present_with_active_regions(0);
 153
 154 #ifdef CONFIG_BLK_DEV_INITRD
 155         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 156         if (&__rd_start != &__rd_end) {
 157                 LOADER_TYPE = 1;
 158                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 159                                         __MEMORY_START;
 160                 INITRD_SIZE = (unsigned long)&__rd_end -
 161                               (unsigned long)&__rd_start;
 162         }
 163
 164         if (LOADER_TYPE && INITRD_START) {
 165                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 166                         reserve_bootmem(INITRD_START + __MEMORY_START,
 167                                         INITRD_SIZE);
 168                         initrd_start = INITRD_START + PAGE_OFFSET +
 169                                         __MEMORY_START;
 170                         initrd_end = initrd_start + INITRD_SIZE;
 171                 } else {
 172                         printk("initrd extends beyond end of memory "
 173                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 174                                     INITRD_START + INITRD_SIZE,
 175                                     max_low_pfn << PAGE_SHIFT);
 176                         initrd_start = 0;
 177                 }
 178         }
 179 #endif
 180 #ifdef CONFIG_KEXEC
 181         if (crashk_res.start != crashk_res.end)
 182                 reserve_bootmem(crashk_res.start,
 183                         crashk_res.end - crashk_res.start + 1);
 184 #endif
 185 }
 186
 187 #ifndef CONFIG_NEED_MULTIPLE_NODES
 188 static void __init setup_memory(void)
 189 {
 190         unsigned long start_pfn;
 191
 192         /*
 193          * Partially used pages are not usable - thus
 194          * we are rounding upwards:
 195          */
 196         start_pfn = PFN_UP(__pa(_end));
 197         setup_bootmem_allocator(start_pfn);
 198 }
 199 #else
 200 extern void __init setup_memory(void);
 201 #endif
 202
 203 void __init setup_arch(char **cmdline_p)
 204 {
 205         enable_mmu();
 206
 207         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 208
 209 #ifdef CONFIG_BLK_DEV_RAM
 210         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 211         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 212         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 213 #endif
 214
 215         if (!MOUNT_ROOT_RDONLY)
 216                 root_mountflags &= ~MS_RDONLY;
 217         init_mm.start_code = (unsigned long) _text;
 218         init_mm.end_code = (unsigned long) _etext;
 219         init_mm.end_data = (unsigned long) _edata;
 220         init_mm.brk = (unsigned long) _end;
 221
 222         code_resource.start = virt_to_phys(_text);
 223         code_resource.end = virt_to_phys(_etext)-1;
 224         data_resource.start = virt_to_phys(_etext);
 225         data_resource.end = virt_to_phys(_edata)-1;
 226
 227         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 228         memory_end = memory_start + __MEMORY_SIZE;
 229
 230 #ifdef CONFIG_CMDLINE_BOOL
 231         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 232 #else
 233         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 234 #endif
 235
 236         /* Save unparsed command line copy for /proc/cmdline */
 237         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 238         *cmdline_p = command_line;
 239
 240         parse_early_param();
 241
 242         sh_mv_setup();
 243
 244         /*
 245          * Find the highest page frame number we have available
 246          */
 247         max_pfn = PFN_DOWN(__pa(memory_end));
 248
 249         /*
 250          * Determine low and high memory ranges:
 251          */
 252         max_low_pfn = max_pfn;
 253         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 254
 255         nodes_clear(node_online_map);
 256
 257         /* Setup bootmem with available RAM */
 258         setup_memory();
 259         sparse_init();
 260
 261 #ifdef CONFIG_DUMMY_CONSOLE
 262         conswitchp = &dummy_con;
 263 #endif
 264
 265         /* Perform the machine specific initialisation */
 266         if (likely(sh_mv.mv_setup))
 267                 sh_mv.mv_setup(cmdline_p);
 268
 269         paging_init();
 270 }
 271
 272 static const char *cpu_name[] = {
 273         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 274         [CPU_SH7300]    = "SH7300",
 275         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 276         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 277         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 278         [CPU_SH7712]    = "SH7712",
 279         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 280         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 281         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 282         [CPU_SH7760]    = "SH7760",     [CPU_SH73180]   = "SH73180",
 283         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 284         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 285         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 286         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 287         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 288         [CPU_SH_NONE]   = "Unknown"
 289 };
 290
 291 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 292 {
 293         return cpu_name[c->type];
 294 }
 295
 296 #ifdef CONFIG_PROC_FS
 297 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 298 static const char *cpu_flags[] = {
 299         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 300         "ptea", "llsc", "l2", "op32", NULL
 301 };
 302
 303 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 304 {
 305         unsigned long i;
 306
 307         seq_printf(m, "cpu flags\t:");
 308
 309         if (!c->flags) {
 310                 seq_printf(m, " %s\n", cpu_flags[0]);
 311                 return;
 312         }
 313
 314         for (i = 0; cpu_flags[i]; i++)
 315                 if ((c->flags & (1 << i)))
 316                         seq_printf(m, " %s", cpu_flags[i+1]);
 317
 318         seq_printf(m, "\n");
 319 }
 320
 321 static void show_cacheinfo(struct seq_file *m, const char *type,
 322                            struct cache_info info)
 323 {
 324         unsigned int cache_size;
 325
 326         cache_size = info.ways * info.sets * info.linesz;
 327
 328         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 329                    type, cache_size >> 10, info.ways);
 330 }
 331
 332 /*
 333  *      Get CPU information for use by the procfs.
 334  */
 335 static int show_cpuinfo(struct seq_file *m, void *v)
 336 {
 337         struct sh_cpuinfo *c = v;
 338         unsigned int cpu = c - cpu_data;
 339
 340         if (!cpu_online(cpu))
 341                 return 0;
 342
 343         if (cpu == 0)
 344                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 345
 346         seq_printf(m, "processor\t: %d\n", cpu);
 347         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 348         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 349
 350         show_cpuflags(m, c);
 351
 352         seq_printf(m, "cache type\t: ");
 353
 354         /*
 355          * Check for what type of cache we have, we support both the
 356          * unified cache on the SH-2 and SH-3, as well as the harvard
 357          * style cache on the SH-4.
 358          */
 359         if (c->icache.flags & SH_CACHE_COMBINED) {
 360                 seq_printf(m, "unified\n");
 361                 show_cacheinfo(m, "cache", c->icache);
 362         } else {
 363                 seq_printf(m, "split (harvard)\n");
 364                 show_cacheinfo(m, "icache", c->icache);
 365                 show_cacheinfo(m, "dcache", c->dcache);
 366         }
 367
 368         /* Optional secondary cache */
 369         if (c->flags & CPU_HAS_L2_CACHE)
 370                 show_cacheinfo(m, "scache", c->scache);
 371
 372         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 373                      c->loops_per_jiffy/(500000/HZ),
 374                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 375
 376         return 0;
 377 }
 378
 379 static void *c_start(struct seq_file *m, loff_t *pos)
 380 {
 381         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 382 }
 383 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 384 {
 385         ++*pos;
 386         return c_start(m, pos);
 387 }
 388 static void c_stop(struct seq_file *m, void *v)
 389 {
 390 }
 391 struct seq_operations cpuinfo_op = {
 392         .start  = c_start,
 393         .next   = c_next,
 394         .stop   = c_stop,
 395         .show   = show_cpuinfo,
 396 };
 397 #endif /* CONFIG_PROC_FS */