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