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