release/src-rt-6.x.4708/linux/linux-2.6.36/arch/xtensa/kernel/setup.c

   1 /*
   2  * arch/xtensa/kernel/setup.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1995  Linus Torvalds
   9  * Copyright (C) 2001 - 2005  Tensilica Inc.
  10  *
  11  * Chris Zankel <chris@zankel.net>
  12  * Joe Taylor   <joe@tensilica.com, joetylr@yahoo.com>
  13  * Kevin Chea
  14  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/screen_info.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/kernel.h>
  24
  25 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  26 # include <linux/console.h>
  27 #endif
  28
  29 #ifdef CONFIG_RTC
  30 # include <linux/timex.h>
  31 #endif
  32
  33 #ifdef CONFIG_PROC_FS
  34 # include <linux/seq_file.h>
  35 #endif
  36
  37 #include <asm/system.h>
  38 #include <asm/bootparam.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/processor.h>
  41 #include <asm/timex.h>
  42 #include <asm/platform.h>
  43 #include <asm/page.h>
  44 #include <asm/setup.h>
  45 #include <asm/param.h>
  46
  47 #include <platform/hardware.h>
  48
  49 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  50 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  51 #endif
  52
  53 #ifdef CONFIG_BLK_DEV_FD
  54 extern struct fd_ops no_fd_ops;
  55 struct fd_ops *fd_ops;
  56 #endif
  57
  58 extern struct rtc_ops no_rtc_ops;
  59 struct rtc_ops *rtc_ops;
  60
  61 #ifdef CONFIG_BLK_DEV_INITRD
  62 extern void *initrd_start;
  63 extern void *initrd_end;
  64 extern void *__initrd_start;
  65 extern void *__initrd_end;
  66 int initrd_is_mapped = 0;
  67 extern int initrd_below_start_ok;
  68 #endif
  69
  70 unsigned char aux_device_present;
  71 extern unsigned long loops_per_jiffy;
  72
  73 /* Command line specified as configuration option. */
  74
  75 static char __initdata command_line[COMMAND_LINE_SIZE];
  76
  77 #ifdef CONFIG_CMDLINE_BOOL
  78 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  79 #endif
  80
  81 sysmem_info_t __initdata sysmem;
  82
  83 #ifdef CONFIG_BLK_DEV_INITRD
  84 int initrd_is_mapped;
  85 #endif
  86
  87 #ifdef CONFIG_MMU
  88 extern void init_mmu(void);
  89 #else
  90 static inline void init_mmu(void) { }
  91 #endif
  92
  93 extern void zones_init(void);
  94
  95 /*
  96  * Boot parameter parsing.
  97  *
  98  * The Xtensa port uses a list of variable-sized tags to pass data to
  99  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 100  * to be recognised. The list is terminated with a zero-sized
 101  * BP_TAG_LAST tag.
 102  */
 103
 104 typedef struct tagtable {
 105         u32 tag;
 106         int (*parse)(const bp_tag_t*);
 107 } tagtable_t;
 108
 109 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
 110         __attribute__((unused, __section__(".taglist"))) = { tag, fn }
 111
 112 /* parse current tag */
 113
 114 static int __init parse_tag_mem(const bp_tag_t *tag)
 115 {
 116         meminfo_t *mi = (meminfo_t*)(tag->data);
 117
 118         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 119                 return -1;
 120
 121         if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
 122                 printk(KERN_WARNING
 123                        "Ignoring memory bank 0x%08lx size %ldKB\n",
 124                        (unsigned long)mi->start,
 125                        (unsigned long)mi->end - (unsigned long)mi->start);
 126                 return -EINVAL;
 127         }
 128         sysmem.bank[sysmem.nr_banks].type  = mi->type;
 129         sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
 130         sysmem.bank[sysmem.nr_banks].end   = mi->end & PAGE_SIZE;
 131         sysmem.nr_banks++;
 132
 133         return 0;
 134 }
 135
 136 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 137
 138 #ifdef CONFIG_BLK_DEV_INITRD
 139
 140 static int __init parse_tag_initrd(const bp_tag_t* tag)
 141 {
 142         meminfo_t* mi;
 143         mi = (meminfo_t*)(tag->data);
 144         initrd_start = (void*)(mi->start);
 145         initrd_end = (void*)(mi->end);
 146
 147         return 0;
 148 }
 149
 150 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 151
 152 #endif /* CONFIG_BLK_DEV_INITRD */
 153
 154 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 155 {
 156         strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
 157         command_line[COMMAND_LINE_SIZE - 1] = '\0';
 158         return 0;
 159 }
 160
 161 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 162
 163 static int __init parse_bootparam(const bp_tag_t* tag)
 164 {
 165         extern tagtable_t __tagtable_begin, __tagtable_end;
 166         tagtable_t *t;
 167
 168         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 169
 170         if (tag->id != BP_TAG_FIRST) {
 171                 printk(KERN_WARNING "Invalid boot parameters!\n");
 172                 return 0;
 173         }
 174
 175         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 176
 177         /* Parse all tags. */
 178
 179         while (tag != NULL && tag->id != BP_TAG_LAST) {
 180                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 181                         if (tag->id == t->tag) {
 182                                 t->parse(tag);
 183                                 break;
 184                         }
 185                 }
 186                 if (t == &__tagtable_end)
 187                         printk(KERN_WARNING "Ignoring tag "
 188                                "0x%08x\n", tag->id);
 189                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 190         }
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * Initialize architecture. (Early stage)
 197  */
 198
 199 void __init init_arch(bp_tag_t *bp_start)
 200 {
 201
 202 #ifdef CONFIG_BLK_DEV_INITRD
 203         initrd_start = &__initrd_start;
 204         initrd_end = &__initrd_end;
 205 #endif
 206
 207         sysmem.nr_banks = 0;
 208
 209 #ifdef CONFIG_CMDLINE_BOOL
 210         strcpy(command_line, default_command_line);
 211 #endif
 212
 213         /* Parse boot parameters */
 214
 215         if (bp_start)
 216           parse_bootparam(bp_start);
 217
 218         if (sysmem.nr_banks == 0) {
 219                 sysmem.nr_banks = 1;
 220                 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
 221                 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
 222                                      + PLATFORM_DEFAULT_MEM_SIZE;
 223         }
 224
 225         /* Early hook for platforms */
 226
 227         platform_init(bp_start);
 228
 229         /* Initialize MMU. */
 230
 231         init_mmu();
 232 }
 233
 234 /*
 235  * Initialize system. Setup memory and reserve regions.
 236  */
 237
 238 extern char _end;
 239 extern char _stext;
 240 extern char _WindowVectors_text_start;
 241 extern char _WindowVectors_text_end;
 242 extern char _DebugInterruptVector_literal_start;
 243 extern char _DebugInterruptVector_text_end;
 244 extern char _KernelExceptionVector_literal_start;
 245 extern char _KernelExceptionVector_text_end;
 246 extern char _UserExceptionVector_literal_start;
 247 extern char _UserExceptionVector_text_end;
 248 extern char _DoubleExceptionVector_literal_start;
 249 extern char _DoubleExceptionVector_text_end;
 250
 251 void __init setup_arch(char **cmdline_p)
 252 {
 253         extern int mem_reserve(unsigned long, unsigned long, int);
 254         extern void bootmem_init(void);
 255
 256         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 257         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 258         *cmdline_p = command_line;
 259
 260         /* Reserve some memory regions */
 261
 262 #ifdef CONFIG_BLK_DEV_INITRD
 263         if (initrd_start < initrd_end) {
 264                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 265                                                __pa(initrd_end), 0);
 266                 initrd_below_start_ok = 1;
 267         } else {
 268                 initrd_start = 0;
 269         }
 270 #endif
 271
 272         mem_reserve(__pa(&_stext),__pa(&_end), 1);
 273
 274         mem_reserve(__pa(&_WindowVectors_text_start),
 275                     __pa(&_WindowVectors_text_end), 0);
 276
 277         mem_reserve(__pa(&_DebugInterruptVector_literal_start),
 278                     __pa(&_DebugInterruptVector_text_end), 0);
 279
 280         mem_reserve(__pa(&_KernelExceptionVector_literal_start),
 281                     __pa(&_KernelExceptionVector_text_end), 0);
 282
 283         mem_reserve(__pa(&_UserExceptionVector_literal_start),
 284                     __pa(&_UserExceptionVector_text_end), 0);
 285
 286         mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
 287                     __pa(&_DoubleExceptionVector_text_end), 0);
 288
 289         bootmem_init();
 290
 291         platform_setup(cmdline_p);
 292
 293
 294         paging_init();
 295         zones_init();
 296
 297 #ifdef CONFIG_VT
 298 # if defined(CONFIG_VGA_CONSOLE)
 299         conswitchp = &vga_con;
 300 # elif defined(CONFIG_DUMMY_CONSOLE)
 301         conswitchp = &dummy_con;
 302 # endif
 303 #endif
 304
 305 #ifdef CONFIG_PCI
 306         platform_pcibios_init();
 307 #endif
 308 }
 309
 310 void machine_restart(char * cmd)
 311 {
 312         platform_restart();
 313 }
 314
 315 void machine_halt(void)
 316 {
 317         platform_halt();
 318         while (1);
 319 }
 320
 321 void machine_power_off(void)
 322 {
 323         platform_power_off();
 324         while (1);
 325 }
 326 #ifdef CONFIG_PROC_FS
 327
 328 /*
 329  * Display some core information through /proc/cpuinfo.
 330  */
 331
 332 static int
 333 c_show(struct seq_file *f, void *slot)
 334 {
 335         /* high-level stuff */
 336         seq_printf(f,"processor\t: 0\n"
 337                      "vendor_id\t: Tensilica\n"
 338                      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 339                      "core ID\t\t: " XCHAL_CORE_ID "\n"
 340                      "build ID\t: 0x%x\n"
 341                      "byte order\t: %s\n"
 342                      "cpu MHz\t\t: %lu.%02lu\n"
 343                      "bogomips\t: %lu.%02lu\n",
 344                      XCHAL_BUILD_UNIQUE_ID,
 345                      XCHAL_HAVE_BE ?  "big" : "little",
 346                      CCOUNT_PER_JIFFY/(1000000/HZ),
 347                      (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
 348                      loops_per_jiffy/(500000/HZ),
 349                      (loops_per_jiffy/(5000/HZ)) % 100);
 350
 351         seq_printf(f,"flags\t\t: "
 352 #if XCHAL_HAVE_NMI
 353                      "nmi "
 354 #endif
 355 #if XCHAL_HAVE_DEBUG
 356                      "debug "
 357 # if XCHAL_HAVE_OCD
 358                      "ocd "
 359 # endif
 360 #endif
 361 #if XCHAL_HAVE_DENSITY
 362                      "density "
 363 #endif
 364 #if XCHAL_HAVE_BOOLEANS
 365                      "boolean "
 366 #endif
 367 #if XCHAL_HAVE_LOOPS
 368                      "loop "
 369 #endif
 370 #if XCHAL_HAVE_NSA
 371                      "nsa "
 372 #endif
 373 #if XCHAL_HAVE_MINMAX
 374                      "minmax "
 375 #endif
 376 #if XCHAL_HAVE_SEXT
 377                      "sext "
 378 #endif
 379 #if XCHAL_HAVE_CLAMPS
 380                      "clamps "
 381 #endif
 382 #if XCHAL_HAVE_MAC16
 383                      "mac16 "
 384 #endif
 385 #if XCHAL_HAVE_MUL16
 386                      "mul16 "
 387 #endif
 388 #if XCHAL_HAVE_MUL32
 389                      "mul32 "
 390 #endif
 391 #if XCHAL_HAVE_MUL32_HIGH
 392                      "mul32h "
 393 #endif
 394 #if XCHAL_HAVE_FP
 395                      "fpu "
 396 #endif
 397                      "\n");
 398
 399         /* Registers. */
 400         seq_printf(f,"physical aregs\t: %d\n"
 401                      "misc regs\t: %d\n"
 402                      "ibreak\t\t: %d\n"
 403                      "dbreak\t\t: %d\n",
 404                      XCHAL_NUM_AREGS,
 405                      XCHAL_NUM_MISC_REGS,
 406                      XCHAL_NUM_IBREAK,
 407                      XCHAL_NUM_DBREAK);
 408
 409
 410         /* Interrupt. */
 411         seq_printf(f,"num ints\t: %d\n"
 412                      "ext ints\t: %d\n"
 413                      "int levels\t: %d\n"
 414                      "timers\t\t: %d\n"
 415                      "debug level\t: %d\n",
 416                      XCHAL_NUM_INTERRUPTS,
 417                      XCHAL_NUM_EXTINTERRUPTS,
 418                      XCHAL_NUM_INTLEVELS,
 419                      XCHAL_NUM_TIMERS,
 420                      XCHAL_DEBUGLEVEL);
 421
 422         /* Cache */
 423         seq_printf(f,"icache line size: %d\n"
 424                      "icache ways\t: %d\n"
 425                      "icache size\t: %d\n"
 426                      "icache flags\t: "
 427 #if XCHAL_ICACHE_LINE_LOCKABLE
 428                      "lock"
 429 #endif
 430                      "\n"
 431                      "dcache line size: %d\n"
 432                      "dcache ways\t: %d\n"
 433                      "dcache size\t: %d\n"
 434                      "dcache flags\t: "
 435 #if XCHAL_DCACHE_IS_WRITEBACK
 436                      "writeback"
 437 #endif
 438 #if XCHAL_DCACHE_LINE_LOCKABLE
 439                      "lock"
 440 #endif
 441                      "\n",
 442                      XCHAL_ICACHE_LINESIZE,
 443                      XCHAL_ICACHE_WAYS,
 444                      XCHAL_ICACHE_SIZE,
 445                      XCHAL_DCACHE_LINESIZE,
 446                      XCHAL_DCACHE_WAYS,
 447                      XCHAL_DCACHE_SIZE);
 448
 449         return 0;
 450 }
 451
 452 /*
 453  * We show only CPU #0 info.
 454  */
 455 static void *
 456 c_start(struct seq_file *f, loff_t *pos)
 457 {
 458         return (void *) ((*pos == 0) ? (void *)1 : NULL);
 459 }
 460
 461 static void *
 462 c_next(struct seq_file *f, void *v, loff_t *pos)
 463 {
 464         return NULL;
 465 }
 466
 467 static void
 468 c_stop(struct seq_file *f, void *v)
 469 {
 470 }
 471
 472 const struct seq_operations cpuinfo_op =
 473 {
 474         start:  c_start,
 475         next:   c_next,
 476         stop:   c_stop,
 477         show:   c_show
 478 };
 479
 480 #endif /* CONFIG_PROC_FS */