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 #include <xtensa/config/system.h>
  46
  47 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  48 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  49 #endif
  50
  51 #ifdef CONFIG_BLK_DEV_FD
  52 extern struct fd_ops no_fd_ops;
  53 struct fd_ops *fd_ops;
  54 #endif
  55
  56 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  57 extern struct ide_ops no_ide_ops;
  58 struct ide_ops *ide_ops;
  59 #endif
  60
  61 extern struct rtc_ops no_rtc_ops;
  62 struct rtc_ops *rtc_ops;
  63
  64 #ifdef CONFIG_PC_KEYB
  65 extern struct kbd_ops no_kbd_ops;
  66 struct kbd_ops *kbd_ops;
  67 #endif
  68
  69 #ifdef CONFIG_BLK_DEV_INITRD
  70 extern void *initrd_start;
  71 extern void *initrd_end;
  72 extern void *__initrd_start;
  73 extern void *__initrd_end;
  74 int initrd_is_mapped = 0;
  75 extern int initrd_below_start_ok;
  76 #endif
  77
  78 unsigned char aux_device_present;
  79 extern unsigned long loops_per_jiffy;
  80
  81 /* Command line specified as configuration option. */
  82
  83 static char command_line[COMMAND_LINE_SIZE];
  84
  85 #ifdef CONFIG_CMDLINE_BOOL
  86 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  87 #endif
  88
  89 sysmem_info_t __initdata sysmem;
  90
  91 #ifdef CONFIG_BLK_DEV_INITRD
  92 int initrd_is_mapped;
  93 #endif
  94
  95 extern void init_mmu(void);
  96
  97 /*
  98  * Boot parameter parsing.
  99  *
 100  * The Xtensa port uses a list of variable-sized tags to pass data to
 101  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 102  * to be recognised. The list is terminated with a zero-sized
 103  * BP_TAG_LAST tag.
 104  */
 105
 106 typedef struct tagtable {
 107         u32 tag;
 108         int (*parse)(const bp_tag_t*);
 109 } tagtable_t;
 110
 111 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
 112         __attribute__((unused, __section__(".taglist"))) = { tag, fn }
 113
 114 /* parse current tag */
 115
 116 static int __init parse_tag_mem(const bp_tag_t *tag)
 117 {
 118         meminfo_t *mi = (meminfo_t*)(tag->data);
 119
 120         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 121                 return -1;
 122
 123         if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
 124                 printk(KERN_WARNING
 125                        "Ignoring memory bank 0x%08lx size %ldKB\n",
 126                        (unsigned long)mi->start,
 127                        (unsigned long)mi->end - (unsigned long)mi->start);
 128                 return -EINVAL;
 129         }
 130         sysmem.bank[sysmem.nr_banks].type  = mi->type;
 131         sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
 132         sysmem.bank[sysmem.nr_banks].end   = mi->end & PAGE_SIZE;
 133         sysmem.nr_banks++;
 134
 135         return 0;
 136 }
 137
 138 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 139
 140 #ifdef CONFIG_BLK_DEV_INITRD
 141
 142 static int __init parse_tag_initrd(const bp_tag_t* tag)
 143 {
 144         meminfo_t* mi;
 145         mi = (meminfo_t*)(tag->data);
 146         initrd_start = (void*)(mi->start);
 147         initrd_end = (void*)(mi->end);
 148
 149         return 0;
 150 }
 151
 152 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 153
 154 #endif /* CONFIG_BLK_DEV_INITRD */
 155
 156 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 157 {
 158         strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
 159         command_line[COMMAND_LINE_SIZE - 1] = '\0';
 160         return 0;
 161 }
 162
 163 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 164
 165 static int __init parse_bootparam(const bp_tag_t* tag)
 166 {
 167         extern tagtable_t __tagtable_begin, __tagtable_end;
 168         tagtable_t *t;
 169
 170         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 171
 172         if (tag->id != BP_TAG_FIRST) {
 173                 printk(KERN_WARNING "Invalid boot parameters!\n");
 174                 return 0;
 175         }
 176
 177         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 178
 179         /* Parse all tags. */
 180
 181         while (tag != NULL && tag->id != BP_TAG_LAST) {
 182                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 183                         if (tag->id == t->tag) {
 184                                 t->parse(tag);
 185                                 break;
 186                         }
 187                 }
 188                 if (t == &__tagtable_end)
 189                         printk(KERN_WARNING "Ignoring tag "
 190                                "0x%08x\n", tag->id);
 191                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 192         }
 193
 194         return 0;
 195 }
 196
 197 /*
 198  * Initialize architecture. (Early stage)
 199  */
 200
 201 void __init init_arch(bp_tag_t *bp_start)
 202 {
 203
 204 #ifdef CONFIG_BLK_DEV_INITRD
 205         initrd_start = &__initrd_start;
 206         initrd_end = &__initrd_end;
 207 #endif
 208
 209         sysmem.nr_banks = 0;
 210
 211 #ifdef CONFIG_CMDLINE_BOOL
 212         strcpy(command_line, default_command_line);
 213 #endif
 214
 215         /* Parse boot parameters */
 216
 217         if (bp_start)
 218           parse_bootparam(bp_start);
 219
 220         if (sysmem.nr_banks == 0) {
 221                 sysmem.nr_banks = 1;
 222                 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
 223                 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
 224                                      + PLATFORM_DEFAULT_MEM_SIZE;
 225         }
 226
 227         /* Early hook for platforms */
 228
 229         platform_init(bp_start);
 230
 231         /* Initialize MMU. */
 232
 233         init_mmu();
 234 }
 235
 236 /*
 237  * Initialize system. Setup memory and reserve regions.
 238  */
 239
 240 extern char _end;
 241 extern char _stext;
 242 extern char _WindowVectors_text_start;
 243 extern char _WindowVectors_text_end;
 244 extern char _DebugInterruptVector_literal_start;
 245 extern char _DebugInterruptVector_text_end;
 246 extern char _KernelExceptionVector_literal_start;
 247 extern char _KernelExceptionVector_text_end;
 248 extern char _UserExceptionVector_literal_start;
 249 extern char _UserExceptionVector_text_end;
 250 extern char _DoubleExceptionVector_literal_start;
 251 extern char _DoubleExceptionVector_text_end;
 252
 253 void __init setup_arch(char **cmdline_p)
 254 {
 255         extern int mem_reserve(unsigned long, unsigned long, int);
 256         extern void bootmem_init(void);
 257
 258         memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 259         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 260         *cmdline_p = command_line;
 261
 262         /* Reserve some memory regions */
 263
 264 #ifdef CONFIG_BLK_DEV_INITRD
 265         if (initrd_start < initrd_end) {
 266                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 267                                                __pa(initrd_end), 0);
 268                 initrd_below_start_ok = 1;
 269         } else {
 270                 initrd_start = 0;
 271         }
 272 #endif
 273
 274         mem_reserve(__pa(&_stext),__pa(&_end), 1);
 275
 276         mem_reserve(__pa(&_WindowVectors_text_start),
 277                     __pa(&_WindowVectors_text_end), 0);
 278
 279         mem_reserve(__pa(&_DebugInterruptVector_literal_start),
 280                     __pa(&_DebugInterruptVector_text_end), 0);
 281
 282         mem_reserve(__pa(&_KernelExceptionVector_literal_start),
 283                     __pa(&_KernelExceptionVector_text_end), 0);
 284
 285         mem_reserve(__pa(&_UserExceptionVector_literal_start),
 286                     __pa(&_UserExceptionVector_text_end), 0);
 287
 288         mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
 289                     __pa(&_DoubleExceptionVector_text_end), 0);
 290
 291         bootmem_init();
 292
 293         platform_setup(cmdline_p);
 294
 295
 296         paging_init();
 297
 298 #ifdef CONFIG_VT
 299 # if defined(CONFIG_VGA_CONSOLE)
 300         conswitchp = &vga_con;
 301 # elif defined(CONFIG_DUMMY_CONSOLE)
 302         conswitchp = &dummy_con;
 303 # endif
 304 #endif
 305
 306 #ifdef CONFIG_PCI
 307         platform_pcibios_init();
 308 #endif
 309 }
 310
 311 void machine_restart(char * cmd)
 312 {
 313         platform_restart();
 314 }
 315
 316 void machine_halt(void)
 317 {
 318         platform_halt();
 319         while (1);
 320 }
 321
 322 void machine_power_off(void)
 323 {
 324         platform_power_off();
 325         while (1);
 326 }
 327 #ifdef CONFIG_PROC_FS
 328
 329 /*
 330  * Display some core information through /proc/cpuinfo.
 331  */
 332
 333 static int
 334 c_show(struct seq_file *f, void *slot)
 335 {
 336         /* high-level stuff */
 337         seq_printf(f,"processor\t: 0\n"
 338                      "vendor_id\t: Tensilica\n"
 339                      "model\t\t: Xtensa " XCHAL_HW_RELEASE_NAME "\n"
 340                      "core ID\t\t: " XCHAL_CORE_ID "\n"
 341                      "build ID\t: 0x%x\n"
 342                      "byte order\t: %s\n"
 343                      "cpu MHz\t\t: %lu.%02lu\n"
 344                      "bogomips\t: %lu.%02lu\n",
 345                      XCHAL_BUILD_UNIQUE_ID,
 346                      XCHAL_HAVE_BE ?  "big" : "little",
 347                      CCOUNT_PER_JIFFY/(1000000/HZ),
 348                      (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
 349                      loops_per_jiffy/(500000/HZ),
 350                      (loops_per_jiffy/(5000/HZ)) % 100);
 351
 352         seq_printf(f,"flags\t\t: "
 353 #if XCHAL_HAVE_NMI
 354                      "nmi "
 355 #endif
 356 #if XCHAL_HAVE_DEBUG
 357                      "debug "
 358 # if XCHAL_HAVE_OCD
 359                      "ocd "
 360 # endif
 361 #endif
 362 #if XCHAL_HAVE_DENSITY
 363                      "density "
 364 #endif
 365 #if XCHAL_HAVE_BOOLEANS
 366                      "boolean "
 367 #endif
 368 #if XCHAL_HAVE_LOOPS
 369                      "loop "
 370 #endif
 371 #if XCHAL_HAVE_NSA
 372                      "nsa "
 373 #endif
 374 #if XCHAL_HAVE_MINMAX
 375                      "minmax "
 376 #endif
 377 #if XCHAL_HAVE_SEXT
 378                      "sext "
 379 #endif
 380 #if XCHAL_HAVE_CLAMPS
 381                      "clamps "
 382 #endif
 383 #if XCHAL_HAVE_MAC16
 384                      "mac16 "
 385 #endif
 386 #if XCHAL_HAVE_MUL16
 387                      "mul16 "
 388 #endif
 389 #if XCHAL_HAVE_MUL32
 390                      "mul32 "
 391 #endif
 392 #if XCHAL_HAVE_MUL32_HIGH
 393                      "mul32h "
 394 #endif
 395 #if XCHAL_HAVE_FP
 396                      "fpu "
 397 #endif
 398                      "\n");
 399
 400         /* Registers. */
 401         seq_printf(f,"physical aregs\t: %d\n"
 402                      "misc regs\t: %d\n"
 403                      "ibreak\t\t: %d\n"
 404                      "dbreak\t\t: %d\n",
 405                      XCHAL_NUM_AREGS,
 406                      XCHAL_NUM_MISC_REGS,
 407                      XCHAL_NUM_IBREAK,
 408                      XCHAL_NUM_DBREAK);
 409
 410
 411         /* Interrupt. */
 412         seq_printf(f,"num ints\t: %d\n"
 413                      "ext ints\t: %d\n"
 414                      "int levels\t: %d\n"
 415                      "timers\t\t: %d\n"
 416                      "debug level\t: %d\n",
 417                      XCHAL_NUM_INTERRUPTS,
 418                      XCHAL_NUM_EXTINTERRUPTS,
 419                      XCHAL_NUM_INTLEVELS,
 420                      XCHAL_NUM_TIMERS,
 421                      XCHAL_DEBUGLEVEL);
 422
 423         /* Coprocessors */
 424 #if XCHAL_HAVE_CP
 425         seq_printf(f, "coprocessors\t: %d\n", XCHAL_CP_NUM);
 426 #else
 427         seq_printf(f, "coprocessors\t: none\n");
 428 #endif
 429
 430         /* {I,D}{RAM,ROM} and XLMI */
 431         seq_printf(f,"inst ROMs\t: %d\n"
 432                      "inst RAMs\t: %d\n"
 433                      "data ROMs\t: %d\n"
 434                      "data RAMs\t: %d\n"
 435                      "XLMI ports\t: %d\n",
 436                      XCHAL_NUM_IROM,
 437                      XCHAL_NUM_IRAM,
 438                      XCHAL_NUM_DROM,
 439                      XCHAL_NUM_DRAM,
 440                      XCHAL_NUM_XLMI);
 441
 442         /* Cache */
 443         seq_printf(f,"icache line size: %d\n"
 444                      "icache ways\t: %d\n"
 445                      "icache size\t: %d\n"
 446                      "icache flags\t: "
 447 #if XCHAL_ICACHE_LINE_LOCKABLE
 448                      "lock"
 449 #endif
 450                      "\n"
 451                      "dcache line size: %d\n"
 452                      "dcache ways\t: %d\n"
 453                      "dcache size\t: %d\n"
 454                      "dcache flags\t: "
 455 #if XCHAL_DCACHE_IS_WRITEBACK
 456                      "writeback"
 457 #endif
 458 #if XCHAL_DCACHE_LINE_LOCKABLE
 459                      "lock"
 460 #endif
 461                      "\n",
 462                      XCHAL_ICACHE_LINESIZE,
 463                      XCHAL_ICACHE_WAYS,
 464                      XCHAL_ICACHE_SIZE,
 465                      XCHAL_DCACHE_LINESIZE,
 466                      XCHAL_DCACHE_WAYS,
 467                      XCHAL_DCACHE_SIZE);
 468
 469         /* MMU */
 470         seq_printf(f,"ASID bits\t: %d\n"
 471                      "ASID invalid\t: %d\n"
 472                      "ASID kernel\t: %d\n"
 473                      "rings\t\t: %d\n"
 474                      "itlb ways\t: %d\n"
 475                      "itlb AR ways\t: %d\n"
 476                      "dtlb ways\t: %d\n"
 477                      "dtlb AR ways\t: %d\n",
 478                      XCHAL_MMU_ASID_BITS,
 479                      XCHAL_MMU_ASID_INVALID,
 480                      XCHAL_MMU_ASID_KERNEL,
 481                      XCHAL_MMU_RINGS,
 482                      XCHAL_ITLB_WAYS,
 483                      XCHAL_ITLB_ARF_WAYS,
 484                      XCHAL_DTLB_WAYS,
 485                      XCHAL_DTLB_ARF_WAYS);
 486
 487         return 0;
 488 }
 489
 490 /*
 491  * We show only CPU #0 info.
 492  */
 493 static void *
 494 c_start(struct seq_file *f, loff_t *pos)
 495 {
 496         return (void *) ((*pos == 0) ? (void *)1 : NULL);
 497 }
 498
 499 static void *
 500 c_next(struct seq_file *f, void *v, loff_t *pos)
 501 {
 502         return NULL;
 503 }
 504
 505 static void
 506 c_stop(struct seq_file *f, void *v)
 507 {
 508 }
 509
 510 struct seq_operations cpuinfo_op =
 511 {
 512         start:  c_start,
 513         next:   c_next,
 514         stop:   c_stop,
 515         show:   c_show
 516 };
 517
 518 #endif /* CONFIG_PROC_FS */
 519