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