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/proc_fs.h>
  20 #include <linux/screen_info.h>
  21 #include <linux/bootmem.h>
  22 #include <linux/kernel.h>
  23
  24 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  25 # include <linux/console.h>
  26 #endif
  27
  28 #ifdef CONFIG_RTC
  29 # include <linux/timex.h>
  30 #endif
  31
  32 #ifdef CONFIG_PROC_FS
  33 # include <linux/seq_file.h>
  34 #endif
  35
  36 #include <asm/system.h>
  37 #include <asm/bootparam.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/processor.h>
  40 #include <asm/timex.h>
  41 #include <asm/platform.h>
  42 #include <asm/page.h>
  43 #include <asm/setup.h>
  44
  45 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  46 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  47 #endif
  48
  49 #ifdef CONFIG_BLK_DEV_FD
  50 extern struct fd_ops no_fd_ops;
  51 struct fd_ops *fd_ops;
  52 #endif
  53
  54 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  55 extern struct ide_ops no_ide_ops;
  56 struct ide_ops *ide_ops;
  57 #endif
  58
  59 extern struct rtc_ops no_rtc_ops;
  60 struct rtc_ops *rtc_ops;
  61
  62 #ifdef CONFIG_PC_KEYB
  63 extern struct kbd_ops no_kbd_ops;
  64 struct kbd_ops *kbd_ops;
  65 #endif
  66
  67 #ifdef CONFIG_BLK_DEV_INITRD
  68 extern void *initrd_start;
  69 extern void *initrd_end;
  70 extern void *__initrd_start;
  71 extern void *__initrd_end;
  72 int initrd_is_mapped = 0;
  73 extern int initrd_below_start_ok;
  74 #endif
  75
  76 unsigned char aux_device_present;
  77 extern unsigned long loops_per_jiffy;
  78
  79 /* Command line specified as configuration option. */
  80
  81 static char __initdata command_line[COMMAND_LINE_SIZE];
  82
  83 #ifdef CONFIG_CMDLINE_BOOL
  84 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  85 #endif
  86
  87 sysmem_info_t __initdata sysmem;
  88
  89 #ifdef CONFIG_BLK_DEV_INITRD
  90 int initrd_is_mapped;
  91 #endif
  92
  93 extern void init_mmu(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
 296 #ifdef CONFIG_VT
 297 # if defined(CONFIG_VGA_CONSOLE)
 298         conswitchp = &vga_con;
 299 # elif defined(CONFIG_DUMMY_CONSOLE)
 300         conswitchp = &dummy_con;
 301 # endif
 302 #endif
 303
 304 #ifdef CONFIG_PCI
 305         platform_pcibios_init();
 306 #endif
 307 }
 308
 309 void machine_restart(char * cmd)
 310 {
 311         platform_restart();
 312 }
 313
 314 void machine_halt(void)
 315 {
 316         platform_halt();
 317         while (1);
 318 }
 319
 320 void machine_power_off(void)
 321 {
 322         platform_power_off();
 323         while (1);
 324 }
 325 #ifdef CONFIG_PROC_FS
 326
 327 /*
 328  * Display some core information through /proc/cpuinfo.
 329  */
 330
 331 static int
 332 c_show(struct seq_file *f, void *slot)
 333 {
 334         /* high-level stuff */
 335         seq_printf(f,"processor\t: 0\n"
 336                      "vendor_id\t: Tensilica\n"
 337                      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 338                      "core ID\t\t: " XCHAL_CORE_ID "\n"
 339                      "build ID\t: 0x%x\n"
 340                      "byte order\t: %s\n"
 341                      "cpu MHz\t\t: %lu.%02lu\n"
 342                      "bogomips\t: %lu.%02lu\n",
 343                      XCHAL_BUILD_UNIQUE_ID,
 344                      XCHAL_HAVE_BE ?  "big" : "little",
 345                      CCOUNT_PER_JIFFY/(1000000/HZ),
 346                      (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
 347                      loops_per_jiffy/(500000/HZ),
 348                      (loops_per_jiffy/(5000/HZ)) % 100);
 349
 350         seq_printf(f,"flags\t\t: "
 351 #if XCHAL_HAVE_NMI
 352                      "nmi "
 353 #endif
 354 #if XCHAL_HAVE_DEBUG
 355                      "debug "
 356 # if XCHAL_HAVE_OCD
 357                      "ocd "
 358 # endif
 359 #endif
 360 #if XCHAL_HAVE_DENSITY
 361                      "density "
 362 #endif
 363 #if XCHAL_HAVE_BOOLEANS
 364                      "boolean "
 365 #endif
 366 #if XCHAL_HAVE_LOOPS
 367                      "loop "
 368 #endif
 369 #if XCHAL_HAVE_NSA
 370                      "nsa "
 371 #endif
 372 #if XCHAL_HAVE_MINMAX
 373                      "minmax "
 374 #endif
 375 #if XCHAL_HAVE_SEXT
 376                      "sext "
 377 #endif
 378 #if XCHAL_HAVE_CLAMPS
 379                      "clamps "
 380 #endif
 381 #if XCHAL_HAVE_MAC16
 382                      "mac16 "
 383 #endif
 384 #if XCHAL_HAVE_MUL16
 385                      "mul16 "
 386 #endif
 387 #if XCHAL_HAVE_MUL32
 388                      "mul32 "
 389 #endif
 390 #if XCHAL_HAVE_MUL32_HIGH
 391                      "mul32h "
 392 #endif
 393 #if XCHAL_HAVE_FP
 394                      "fpu "
 395 #endif
 396                      "\n");
 397
 398         /* Registers. */
 399         seq_printf(f,"physical aregs\t: %d\n"
 400                      "misc regs\t: %d\n"
 401                      "ibreak\t\t: %d\n"
 402                      "dbreak\t\t: %d\n",
 403                      XCHAL_NUM_AREGS,
 404                      XCHAL_NUM_MISC_REGS,
 405                      XCHAL_NUM_IBREAK,
 406                      XCHAL_NUM_DBREAK);
 407
 408
 409         /* Interrupt. */
 410         seq_printf(f,"num ints\t: %d\n"
 411                      "ext ints\t: %d\n"
 412                      "int levels\t: %d\n"
 413                      "timers\t\t: %d\n"
 414                      "debug level\t: %d\n",
 415                      XCHAL_NUM_INTERRUPTS,
 416                      XCHAL_NUM_EXTINTERRUPTS,
 417                      XCHAL_NUM_INTLEVELS,
 418                      XCHAL_NUM_TIMERS,
 419                      XCHAL_DEBUGLEVEL);
 420
 421         /* Cache */
 422         seq_printf(f,"icache line size: %d\n"
 423                      "icache ways\t: %d\n"
 424                      "icache size\t: %d\n"
 425                      "icache flags\t: "
 426 #if XCHAL_ICACHE_LINE_LOCKABLE
 427                      "lock"
 428 #endif
 429                      "\n"
 430                      "dcache line size: %d\n"
 431                      "dcache ways\t: %d\n"
 432                      "dcache size\t: %d\n"
 433                      "dcache flags\t: "
 434 #if XCHAL_DCACHE_IS_WRITEBACK
 435                      "writeback"
 436 #endif
 437 #if XCHAL_DCACHE_LINE_LOCKABLE
 438                      "lock"
 439 #endif
 440                      "\n",
 441                      XCHAL_ICACHE_LINESIZE,
 442                      XCHAL_ICACHE_WAYS,
 443                      XCHAL_ICACHE_SIZE,
 444                      XCHAL_DCACHE_LINESIZE,
 445                      XCHAL_DCACHE_WAYS,
 446                      XCHAL_DCACHE_SIZE);
 447
 448         return 0;
 449 }
 450
 451 /*
 452  * We show only CPU #0 info.
 453  */
 454 static void *
 455 c_start(struct seq_file *f, loff_t *pos)
 456 {
 457         return (void *) ((*pos == 0) ? (void *)1 : NULL);
 458 }
 459
 460 static void *
 461 c_next(struct seq_file *f, void *v, loff_t *pos)
 462 {
 463         return NULL;
 464 }
 465
 466 static void
 467 c_stop(struct seq_file *f, void *v)
 468 {
 469 }
 470
 471 struct seq_operations cpuinfo_op =
 472 {
 473         start:  c_start,
 474         next:   c_next,
 475         stop:   c_stop,
 476         show:   c_show
 477 };
 478
 479 #endif /* CONFIG_PROC_FS */
 480