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