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