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 #include <asm/param.h>
  45
  46 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  47 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  48 #endif
  49
  50 #ifdef CONFIG_BLK_DEV_FD
  51 extern struct fd_ops no_fd_ops;
  52 struct fd_ops *fd_ops;
  53 #endif
  54
  55 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  56 extern struct ide_ops no_ide_ops;
  57 struct ide_ops *ide_ops;
  58 #endif
  59
  60 extern struct rtc_ops no_rtc_ops;
  61 struct rtc_ops *rtc_ops;
  62
  63 #ifdef CONFIG_PC_KEYB
  64 extern struct kbd_ops no_kbd_ops;
  65 struct kbd_ops *kbd_ops;
  66 #endif
  67
  68 #ifdef CONFIG_BLK_DEV_INITRD
  69 extern void *initrd_start;
  70 extern void *initrd_end;
  71 extern void *__initrd_start;
  72 extern void *__initrd_end;
  73 int initrd_is_mapped = 0;
  74 extern int initrd_below_start_ok;
  75 #endif
  76
  77 unsigned char aux_device_present;
  78 extern unsigned long loops_per_jiffy;
  79
  80 /* Command line specified as configuration option. */
  81
  82 static char __initdata command_line[COMMAND_LINE_SIZE];
  83
  84 #ifdef CONFIG_CMDLINE_BOOL
  85 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  86 #endif
  87
  88 sysmem_info_t __initdata sysmem;
  89
  90 #ifdef CONFIG_BLK_DEV_INITRD
  91 int initrd_is_mapped;
  92 #endif
  93
  94 extern void init_mmu(void);
  95
  96 /*
  97  * Boot parameter parsing.
  98  *
  99  * The Xtensa port uses a list of variable-sized tags to pass data to
 100  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 101  * to be recognised. The list is terminated with a zero-sized
 102  * BP_TAG_LAST tag.
 103  */
 104
 105 typedef struct tagtable {
 106         u32 tag;
 107         int (*parse)(const bp_tag_t*);
 108 } tagtable_t;
 109
 110 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
 111         __attribute__((unused, __section__(".taglist"))) = { tag, fn }
 112
 113 /* parse current tag */
 114
 115 static int __init parse_tag_mem(const bp_tag_t *tag)
 116 {
 117         meminfo_t *mi = (meminfo_t*)(tag->data);
 118
 119         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 120                 return -1;
 121
 122         if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
 123                 printk(KERN_WARNING
 124                        "Ignoring memory bank 0x%08lx size %ldKB\n",
 125                        (unsigned long)mi->start,
 126                        (unsigned long)mi->end - (unsigned long)mi->start);
 127                 return -EINVAL;
 128         }
 129         sysmem.bank[sysmem.nr_banks].type  = mi->type;
 130         sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
 131         sysmem.bank[sysmem.nr_banks].end   = mi->end & PAGE_SIZE;
 132         sysmem.nr_banks++;
 133
 134         return 0;
 135 }
 136
 137 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 138
 139 #ifdef CONFIG_BLK_DEV_INITRD
 140
 141 static int __init parse_tag_initrd(const bp_tag_t* tag)
 142 {
 143         meminfo_t* mi;
 144         mi = (meminfo_t*)(tag->data);
 145         initrd_start = (void*)(mi->start);
 146         initrd_end = (void*)(mi->end);
 147
 148         return 0;
 149 }
 150
 151 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 152
 153 #endif /* CONFIG_BLK_DEV_INITRD */
 154
 155 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 156 {
 157         strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
 158         command_line[COMMAND_LINE_SIZE - 1] = '\0';
 159         return 0;
 160 }
 161
 162 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 163
 164 static int __init parse_bootparam(const bp_tag_t* tag)
 165 {
 166         extern tagtable_t __tagtable_begin, __tagtable_end;
 167         tagtable_t *t;
 168
 169         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 170
 171         if (tag->id != BP_TAG_FIRST) {
 172                 printk(KERN_WARNING "Invalid boot parameters!\n");
 173                 return 0;
 174         }
 175
 176         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 177
 178         /* Parse all tags. */
 179
 180         while (tag != NULL && tag->id != BP_TAG_LAST) {
 181                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 182                         if (tag->id == t->tag) {
 183                                 t->parse(tag);
 184                                 break;
 185                         }
 186                 }
 187                 if (t == &__tagtable_end)
 188                         printk(KERN_WARNING "Ignoring tag "
 189                                "0x%08x\n", tag->id);
 190                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 191         }
 192
 193         return 0;
 194 }
 195
 196 /*
 197  * Initialize architecture. (Early stage)
 198  */
 199
 200 void __init init_arch(bp_tag_t *bp_start)
 201 {
 202
 203 #ifdef CONFIG_BLK_DEV_INITRD
 204         initrd_start = &__initrd_start;
 205         initrd_end = &__initrd_end;
 206 #endif
 207
 208         sysmem.nr_banks = 0;
 209
 210 #ifdef CONFIG_CMDLINE_BOOL
 211         strcpy(command_line, default_command_line);
 212 #endif
 213
 214         /* Parse boot parameters */
 215
 216         if (bp_start)
 217           parse_bootparam(bp_start);
 218
 219         if (sysmem.nr_banks == 0) {
 220                 sysmem.nr_banks = 1;
 221                 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
 222                 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
 223                                      + PLATFORM_DEFAULT_MEM_SIZE;
 224         }
 225
 226         /* Early hook for platforms */
 227
 228         platform_init(bp_start);
 229
 230         /* Initialize MMU. */
 231
 232         init_mmu();
 233 }
 234
 235 /*
 236  * Initialize system. Setup memory and reserve regions.
 237  */
 238
 239 extern char _end;
 240 extern char _stext;
 241 extern char _WindowVectors_text_start;
 242 extern char _WindowVectors_text_end;
 243 extern char _DebugInterruptVector_literal_start;
 244 extern char _DebugInterruptVector_text_end;
 245 extern char _KernelExceptionVector_literal_start;
 246 extern char _KernelExceptionVector_text_end;
 247 extern char _UserExceptionVector_literal_start;
 248 extern char _UserExceptionVector_text_end;
 249 extern char _DoubleExceptionVector_literal_start;
 250 extern char _DoubleExceptionVector_text_end;
 251
 252 void __init setup_arch(char **cmdline_p)
 253 {
 254         extern int mem_reserve(unsigned long, unsigned long, int);
 255         extern void bootmem_init(void);
 256
 257         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 258         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 259         *cmdline_p = command_line;
 260
 261         /* Reserve some memory regions */
 262
 263 #ifdef CONFIG_BLK_DEV_INITRD
 264         if (initrd_start < initrd_end) {
 265                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 266                                                __pa(initrd_end), 0);
 267                 initrd_below_start_ok = 1;
 268         } else {
 269                 initrd_start = 0;
 270         }
 271 #endif
 272
 273         mem_reserve(__pa(&_stext),__pa(&_end), 1);
 274
 275         mem_reserve(__pa(&_WindowVectors_text_start),
 276                     __pa(&_WindowVectors_text_end), 0);
 277
 278         mem_reserve(__pa(&_DebugInterruptVector_literal_start),
 279                     __pa(&_DebugInterruptVector_text_end), 0);
 280
 281         mem_reserve(__pa(&_KernelExceptionVector_literal_start),
 282                     __pa(&_KernelExceptionVector_text_end), 0);
 283
 284         mem_reserve(__pa(&_UserExceptionVector_literal_start),
 285                     __pa(&_UserExceptionVector_text_end), 0);
 286
 287         mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
 288                     __pa(&_DoubleExceptionVector_text_end), 0);
 289
 290         bootmem_init();
 291
 292         platform_setup(cmdline_p);
 293
 294
 295         paging_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 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 */
 481