arch/xtensa/kernel/setup.c

   1 /*
   2  * arch/xtensa/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/config.h>
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/tty.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
  46 #include <xtensa/config/system.h>
  47
  48 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  49 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  50 #endif
  51
  52 #ifdef CONFIG_BLK_DEV_FD
  53 extern struct fd_ops no_fd_ops;
  54 struct fd_ops *fd_ops;
  55 #endif
  56
  57 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  58 extern struct ide_ops no_ide_ops;
  59 struct ide_ops *ide_ops;
  60 #endif
  61
  62 extern struct rtc_ops no_rtc_ops;
  63 struct rtc_ops *rtc_ops;
  64
  65 #ifdef CONFIG_PC_KEYB
  66 extern struct kbd_ops no_kbd_ops;
  67 struct kbd_ops *kbd_ops;
  68 #endif
  69
  70 #ifdef CONFIG_BLK_DEV_INITRD
  71 extern void *initrd_start;
  72 extern void *initrd_end;
  73 extern void *__initrd_start;
  74 extern void *__initrd_end;
  75 int initrd_is_mapped = 0;
  76 extern int initrd_below_start_ok;
  77 #endif
  78
  79 unsigned char aux_device_present;
  80 extern unsigned long loops_per_jiffy;
  81
  82 /* Command line specified as configuration option. */
  83
  84 static char command_line[COMMAND_LINE_SIZE];
  85
  86 #ifdef CONFIG_CMDLINE_BOOL
  87 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  88 #endif
  89
  90 sysmem_info_t __initdata sysmem;
  91
  92 #ifdef CONFIG_BLK_DEV_INITRD
  93 int initrd_is_mapped;
  94 #endif
  95
  96 extern void init_mmu(void);
  97
  98 /*
  99  * Boot parameter parsing.
 100  *
 101  * The Xtensa port uses a list of variable-sized tags to pass data to
 102  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 103  * to be recognised. The list is terminated with a zero-sized
 104  * BP_TAG_LAST tag.
 105  */
 106
 107 typedef struct tagtable {
 108         u32 tag;
 109         int (*parse)(const bp_tag_t*);
 110 } tagtable_t;
 111
 112 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
 113         __attribute__((unused, __section__(".taglist"))) = { tag, fn }
 114
 115 /* parse current tag */
 116
 117 static int __init parse_tag_mem(const bp_tag_t *tag)
 118 {
 119         meminfo_t *mi = (meminfo_t*)(tag->data);
 120
 121         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 122                 return -1;
 123
 124         if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
 125                 printk(KERN_WARNING
 126                        "Ignoring memory bank 0x%08lx size %ldKB\n",
 127                        (unsigned long)mi->start,
 128                        (unsigned long)mi->end - (unsigned long)mi->start);
 129                 return -EINVAL;
 130         }
 131         sysmem.bank[sysmem.nr_banks].type  = mi->type;
 132         sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
 133         sysmem.bank[sysmem.nr_banks].end   = mi->end & PAGE_SIZE;
 134         sysmem.nr_banks++;
 135
 136         return 0;
 137 }
 138
 139 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 140
 141 #ifdef CONFIG_BLK_DEV_INITRD
 142
 143 static int __init parse_tag_initrd(const bp_tag_t* tag)
 144 {
 145         meminfo_t* mi;
 146         mi = (meminfo_t*)(tag->data);
 147         initrd_start = (void*)(mi->start);
 148         initrd_end = (void*)(mi->end);
 149
 150         return 0;
 151 }
 152
 153 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 154
 155 #endif /* CONFIG_BLK_DEV_INITRD */
 156
 157 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 158 {
 159         strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
 160         command_line[COMMAND_LINE_SIZE - 1] = '\0';
 161         return 0;
 162 }
 163
 164 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 165
 166 static int __init parse_bootparam(const bp_tag_t* tag)
 167 {
 168         extern tagtable_t __tagtable_begin, __tagtable_end;
 169         tagtable_t *t;
 170
 171         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 172
 173         if (tag->id != BP_TAG_FIRST) {
 174                 printk(KERN_WARNING "Invalid boot parameters!\n");
 175                 return 0;
 176         }
 177
 178         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 179
 180         /* Parse all tags. */
 181
 182         while (tag != NULL && tag->id != BP_TAG_LAST) {
 183                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 184                         if (tag->id == t->tag) {
 185                                 t->parse(tag);
 186                                 break;
 187                         }
 188                 }
 189                 if (t == &__tagtable_end)
 190                         printk(KERN_WARNING "Ignoring tag "
 191                                "0x%08x\n", tag->id);
 192                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 193         }
 194
 195         return 0;
 196 }
 197
 198 /*
 199  * Initialize architecture. (Early stage)
 200  */
 201
 202 void __init init_arch(bp_tag_t *bp_start)
 203 {
 204
 205 #ifdef CONFIG_BLK_DEV_INITRD
 206         initrd_start = &__initrd_start;
 207         initrd_end = &__initrd_end;
 208 #endif
 209
 210         sysmem.nr_banks = 0;
 211
 212 #ifdef CONFIG_CMDLINE_BOOL
 213         strcpy(command_line, default_command_line);
 214 #endif
 215
 216         /* Parse boot parameters */
 217
 218         if (bp_start)
 219           parse_bootparam(bp_start);
 220
 221         if (sysmem.nr_banks == 0) {
 222                 sysmem.nr_banks = 1;
 223                 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
 224                 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
 225                                      + PLATFORM_DEFAULT_MEM_SIZE;
 226         }
 227
 228         /* Early hook for platforms */
 229
 230         platform_init(bp_start);
 231
 232         /* Initialize MMU. */
 233
 234         init_mmu();
 235 }
 236
 237 /*
 238  * Initialize system. Setup memory and reserve regions.
 239  */
 240
 241 extern char _end;
 242 extern char _stext;
 243 extern char _WindowVectors_text_start;
 244 extern char _WindowVectors_text_end;
 245 extern char _DebugInterruptVector_literal_start;
 246 extern char _DebugInterruptVector_text_end;
 247 extern char _KernelExceptionVector_literal_start;
 248 extern char _KernelExceptionVector_text_end;
 249 extern char _UserExceptionVector_literal_start;
 250 extern char _UserExceptionVector_text_end;
 251 extern char _DoubleExceptionVector_literal_start;
 252 extern char _DoubleExceptionVector_text_end;
 253
 254 void __init setup_arch(char **cmdline_p)
 255 {
 256         extern int mem_reserve(unsigned long, unsigned long, int);
 257         extern void bootmem_init(void);
 258
 259         memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 260         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 261         *cmdline_p = command_line;
 262
 263         /* Reserve some memory regions */
 264
 265 #ifdef CONFIG_BLK_DEV_INITRD
 266         if (initrd_start < initrd_end) {
 267                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 268                                                __pa(initrd_end), 0);
 269                 initrd_below_start_ok = 1;
 270         } else {
 271                 initrd_start = 0;
 272         }
 273 #endif
 274
 275         mem_reserve(__pa(&_stext),__pa(&_end), 1);
 276
 277         mem_reserve(__pa(&_WindowVectors_text_start),
 278                     __pa(&_WindowVectors_text_end), 0);
 279
 280         mem_reserve(__pa(&_DebugInterruptVector_literal_start),
 281                     __pa(&_DebugInterruptVector_text_end), 0);
 282
 283         mem_reserve(__pa(&_KernelExceptionVector_literal_start),
 284                     __pa(&_KernelExceptionVector_text_end), 0);
 285
 286         mem_reserve(__pa(&_UserExceptionVector_literal_start),
 287                     __pa(&_UserExceptionVector_text_end), 0);
 288
 289         mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
 290                     __pa(&_DoubleExceptionVector_text_end), 0);
 291
 292         bootmem_init();
 293
 294         platform_setup(cmdline_p);
 295
 296
 297         paging_init();
 298
 299 #ifdef CONFIG_VT
 300 # if defined(CONFIG_VGA_CONSOLE)
 301         conswitchp = &vga_con;
 302 # elif defined(CONFIG_DUMMY_CONSOLE)
 303         conswitchp = &dummy_con;
 304 # endif
 305 #endif
 306
 307 #ifdef CONFIG_PCI
 308         platform_pcibios_init();
 309 #endif
 310 }
 311
 312 void machine_restart(char * cmd)
 313 {
 314         platform_restart();
 315 }
 316
 317 void machine_halt(void)
 318 {
 319         platform_halt();
 320         while (1);
 321 }
 322
 323 void machine_power_off(void)
 324 {
 325         platform_power_off();
 326         while (1);
 327 }
 328 #ifdef CONFIG_PROC_FS
 329
 330 /*
 331  * Display some core information through /proc/cpuinfo.
 332  */
 333
 334 static int
 335 c_show(struct seq_file *f, void *slot)
 336 {
 337         /* high-level stuff */
 338         seq_printf(f,"processor\t: 0\n"
 339                      "vendor_id\t: Tensilica\n"
 340                      "model\t\t: Xtensa " XCHAL_HW_RELEASE_NAME "\n"
 341                      "core ID\t\t: " XCHAL_CORE_ID "\n"
 342                      "build ID\t: 0x%x\n"
 343                      "byte order\t: %s\n"
 344                      "cpu MHz\t\t: %lu.%02lu\n"
 345                      "bogomips\t: %lu.%02lu\n",
 346                      XCHAL_BUILD_UNIQUE_ID,
 347                      XCHAL_HAVE_BE ?  "big" : "little",
 348                      CCOUNT_PER_JIFFY/(1000000/HZ),
 349                      (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
 350                      loops_per_jiffy/(500000/HZ),
 351                      (loops_per_jiffy/(5000/HZ)) % 100);
 352
 353         seq_printf(f,"flags\t\t: "
 354 #if XCHAL_HAVE_NMI
 355                      "nmi "
 356 #endif
 357 #if XCHAL_HAVE_DEBUG
 358                      "debug "
 359 # if XCHAL_HAVE_OCD
 360                      "ocd "
 361 # endif
 362 #endif
 363 #if XCHAL_HAVE_DENSITY
 364                      "density "
 365 #endif
 366 #if XCHAL_HAVE_BOOLEANS
 367                      "boolean "
 368 #endif
 369 #if XCHAL_HAVE_LOOPS
 370                      "loop "
 371 #endif
 372 #if XCHAL_HAVE_NSA
 373                      "nsa "
 374 #endif
 375 #if XCHAL_HAVE_MINMAX
 376                      "minmax "
 377 #endif
 378 #if XCHAL_HAVE_SEXT
 379                      "sext "
 380 #endif
 381 #if XCHAL_HAVE_CLAMPS
 382                      "clamps "
 383 #endif
 384 #if XCHAL_HAVE_MAC16
 385                      "mac16 "
 386 #endif
 387 #if XCHAL_HAVE_MUL16
 388                      "mul16 "
 389 #endif
 390 #if XCHAL_HAVE_MUL32
 391                      "mul32 "
 392 #endif
 393 #if XCHAL_HAVE_MUL32_HIGH
 394                      "mul32h "
 395 #endif
 396 #if XCHAL_HAVE_FP
 397                      "fpu "
 398 #endif
 399                      "\n");
 400
 401         /* Registers. */
 402         seq_printf(f,"physical aregs\t: %d\n"
 403                      "misc regs\t: %d\n"
 404                      "ibreak\t\t: %d\n"
 405                      "dbreak\t\t: %d\n",
 406                      XCHAL_NUM_AREGS,
 407                      XCHAL_NUM_MISC_REGS,
 408                      XCHAL_NUM_IBREAK,
 409                      XCHAL_NUM_DBREAK);
 410
 411
 412         /* Interrupt. */
 413         seq_printf(f,"num ints\t: %d\n"
 414                      "ext ints\t: %d\n"
 415                      "int levels\t: %d\n"
 416                      "timers\t\t: %d\n"
 417                      "debug level\t: %d\n",
 418                      XCHAL_NUM_INTERRUPTS,
 419                      XCHAL_NUM_EXTINTERRUPTS,
 420                      XCHAL_NUM_INTLEVELS,
 421                      XCHAL_NUM_TIMERS,
 422                      XCHAL_DEBUGLEVEL);
 423
 424         /* Coprocessors */
 425 #if XCHAL_HAVE_CP
 426         seq_printf(f, "coprocessors\t: %d\n", XCHAL_CP_NUM);
 427 #else
 428         seq_printf(f, "coprocessors\t: none\n");
 429 #endif
 430
 431         /* {I,D}{RAM,ROM} and XLMI */
 432         seq_printf(f,"inst ROMs\t: %d\n"
 433                      "inst RAMs\t: %d\n"
 434                      "data ROMs\t: %d\n"
 435                      "data RAMs\t: %d\n"
 436                      "XLMI ports\t: %d\n",
 437                      XCHAL_NUM_IROM,
 438                      XCHAL_NUM_IRAM,
 439                      XCHAL_NUM_DROM,
 440                      XCHAL_NUM_DRAM,
 441                      XCHAL_NUM_XLMI);
 442
 443         /* Cache */
 444         seq_printf(f,"icache line size: %d\n"
 445                      "icache ways\t: %d\n"
 446                      "icache size\t: %d\n"
 447                      "icache flags\t: "
 448 #if XCHAL_ICACHE_LINE_LOCKABLE
 449                      "lock"
 450 #endif
 451                      "\n"
 452                      "dcache line size: %d\n"
 453                      "dcache ways\t: %d\n"
 454                      "dcache size\t: %d\n"
 455                      "dcache flags\t: "
 456 #if XCHAL_DCACHE_IS_WRITEBACK
 457                      "writeback"
 458 #endif
 459 #if XCHAL_DCACHE_LINE_LOCKABLE
 460                      "lock"
 461 #endif
 462                      "\n",
 463                      XCHAL_ICACHE_LINESIZE,
 464                      XCHAL_ICACHE_WAYS,
 465                      XCHAL_ICACHE_SIZE,
 466                      XCHAL_DCACHE_LINESIZE,
 467                      XCHAL_DCACHE_WAYS,
 468                      XCHAL_DCACHE_SIZE);
 469
 470         /* MMU */
 471         seq_printf(f,"ASID bits\t: %d\n"
 472                      "ASID invalid\t: %d\n"
 473                      "ASID kernel\t: %d\n"
 474                      "rings\t\t: %d\n"
 475                      "itlb ways\t: %d\n"
 476                      "itlb AR ways\t: %d\n"
 477                      "dtlb ways\t: %d\n"
 478                      "dtlb AR ways\t: %d\n",
 479                      XCHAL_MMU_ASID_BITS,
 480                      XCHAL_MMU_ASID_INVALID,
 481                      XCHAL_MMU_ASID_KERNEL,
 482                      XCHAL_MMU_RINGS,
 483                      XCHAL_ITLB_WAYS,
 484                      XCHAL_ITLB_ARF_WAYS,
 485                      XCHAL_DTLB_WAYS,
 486                      XCHAL_DTLB_ARF_WAYS);
 487
 488         return 0;
 489 }
 490
 491 /*
 492  * We show only CPU #0 info.
 493  */
 494 static void *
 495 c_start(struct seq_file *f, loff_t *pos)
 496 {
 497         return (void *) ((*pos == 0) ? (void *)1 : NULL);
 498 }
 499
 500 static void *
 501 c_next(struct seq_file *f, void *v, loff_t *pos)
 502 {
 503         return NULL;
 504 }
 505
 506 static void
 507 c_stop(struct seq_file *f, void *v)
 508 {
 509 }
 510
 511 struct seq_operations cpuinfo_op =
 512 {
 513         start:  c_start,
 514         next:   c_next,
 515         stop:   c_stop,
 516         show:   c_show
 517 };
 518
 519 #endif /* CONFIG_PROC_FS */
 520