arch/blackfin/kernel/setup.c

   1 /*
   2  * arch/blackfin/kernel/setup.c
   3  *
   4  * Copyright 2004-2006 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/console.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/cpu.h>
  16 #include <linux/module.h>
  17 #include <linux/tty.h>
  18 #include <linux/pfn.h>
  19
  20 #include <linux/ext2_fs.h>
  21 #include <linux/cramfs_fs.h>
  22 #include <linux/romfs_fs.h>
  23
  24 #include <asm/cplb.h>
  25 #include <asm/cacheflush.h>
  26 #include <asm/blackfin.h>
  27 #include <asm/cplbinit.h>
  28 #include <asm/div64.h>
  29 #include <asm/fixed_code.h>
  30 #include <asm/early_printk.h>
  31
  32 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  33
  34 u16 _bfin_swrst;
  35 EXPORT_SYMBOL(_bfin_swrst);
  36
  37 unsigned long memory_start, memory_end, physical_mem_end;
  38 unsigned long _rambase, _ramstart, _ramend;
  39 unsigned long reserved_mem_dcache_on;
  40 unsigned long reserved_mem_icache_on;
  41 EXPORT_SYMBOL(memory_start);
  42 EXPORT_SYMBOL(memory_end);
  43 EXPORT_SYMBOL(physical_mem_end);
  44 EXPORT_SYMBOL(_ramend);
  45
  46 #ifdef CONFIG_MTD_UCLINUX
  47 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
  48 unsigned long _ebss;
  49 EXPORT_SYMBOL(memory_mtd_end);
  50 EXPORT_SYMBOL(memory_mtd_start);
  51 EXPORT_SYMBOL(mtd_size);
  52 #endif
  53
  54 char __initdata command_line[COMMAND_LINE_SIZE];
  55
  56 /* boot memmap, for parsing "memmap=" */
  57 #define BFIN_MEMMAP_MAX         128 /* number of entries in bfin_memmap */
  58 #define BFIN_MEMMAP_RAM         1
  59 #define BFIN_MEMMAP_RESERVED    2
  60 struct bfin_memmap {
  61         int nr_map;
  62         struct bfin_memmap_entry {
  63                 unsigned long long addr; /* start of memory segment */
  64                 unsigned long long size;
  65                 unsigned long type;
  66         } map[BFIN_MEMMAP_MAX];
  67 } bfin_memmap __initdata;
  68
  69 /* for memmap sanitization */
  70 struct change_member {
  71         struct bfin_memmap_entry *pentry; /* pointer to original entry */
  72         unsigned long long addr; /* address for this change point */
  73 };
  74 static struct change_member change_point_list[2*BFIN_MEMMAP_MAX] __initdata;
  75 static struct change_member *change_point[2*BFIN_MEMMAP_MAX] __initdata;
  76 static struct bfin_memmap_entry *overlap_list[BFIN_MEMMAP_MAX] __initdata;
  77 static struct bfin_memmap_entry new_map[BFIN_MEMMAP_MAX] __initdata;
  78
  79 void __init bf53x_cache_init(void)
  80 {
  81 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  82         generate_cpl_tables();
  83 #endif
  84
  85 #ifdef CONFIG_BFIN_ICACHE
  86         bfin_icache_init();
  87         printk(KERN_INFO "Instruction Cache Enabled\n");
  88 #endif
  89
  90 #ifdef CONFIG_BFIN_DCACHE
  91         bfin_dcache_init();
  92         printk(KERN_INFO "Data Cache Enabled"
  93 # if defined CONFIG_BFIN_WB
  94                 " (write-back)"
  95 # elif defined CONFIG_BFIN_WT
  96                 " (write-through)"
  97 # endif
  98                 "\n");
  99 #endif
 100 }
 101
 102 void __init bf53x_relocate_l1_mem(void)
 103 {
 104         unsigned long l1_code_length;
 105         unsigned long l1_data_a_length;
 106         unsigned long l1_data_b_length;
 107
 108         l1_code_length = _etext_l1 - _stext_l1;
 109         if (l1_code_length > L1_CODE_LENGTH)
 110                 panic("L1 Instruction SRAM Overflow\n");
 111         /* cannot complain as printk is not available as yet.
 112          * But we can continue booting and complain later!
 113          */
 114
 115         /* Copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
 116         dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
 117
 118         l1_data_a_length = _ebss_l1 - _sdata_l1;
 119         if (l1_data_a_length > L1_DATA_A_LENGTH)
 120                 panic("L1 Data SRAM Bank A Overflow\n");
 121
 122         /* Copy _sdata_l1 to _ebss_l1 to L1 data bank A SRAM */
 123         dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
 124
 125         l1_data_b_length = _ebss_b_l1 - _sdata_b_l1;
 126         if (l1_data_b_length > L1_DATA_B_LENGTH)
 127                 panic("L1 Data SRAM Bank B Overflow\n");
 128
 129         /* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
 130         dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
 131                         l1_data_a_length, l1_data_b_length);
 132 }
 133
 134 /* add_memory_region to memmap */
 135 static void __init add_memory_region(unsigned long long start,
 136                               unsigned long long size, int type)
 137 {
 138         int i;
 139
 140         i = bfin_memmap.nr_map;
 141
 142         if (i == BFIN_MEMMAP_MAX) {
 143                 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 144                 return;
 145         }
 146
 147         bfin_memmap.map[i].addr = start;
 148         bfin_memmap.map[i].size = size;
 149         bfin_memmap.map[i].type = type;
 150         bfin_memmap.nr_map++;
 151 }
 152
 153 /*
 154  * Sanitize the boot memmap, removing overlaps.
 155  */
 156 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
 157 {
 158         struct change_member *change_tmp;
 159         unsigned long current_type, last_type;
 160         unsigned long long last_addr;
 161         int chgidx, still_changing;
 162         int overlap_entries;
 163         int new_entry;
 164         int old_nr, new_nr, chg_nr;
 165         int i;
 166
 167         /*
 168                 Visually we're performing the following (1,2,3,4 = memory types)
 169
 170                 Sample memory map (w/overlaps):
 171                    ____22__________________
 172                    ______________________4_
 173                    ____1111________________
 174                    _44_____________________
 175                    11111111________________
 176                    ____________________33__
 177                    ___________44___________
 178                    __________33333_________
 179                    ______________22________
 180                    ___________________2222_
 181                    _________111111111______
 182                    _____________________11_
 183                    _________________4______
 184
 185                 Sanitized equivalent (no overlap):
 186                    1_______________________
 187                    _44_____________________
 188                    ___1____________________
 189                    ____22__________________
 190                    ______11________________
 191                    _________1______________
 192                    __________3_____________
 193                    ___________44___________
 194                    _____________33_________
 195                    _______________2________
 196                    ________________1_______
 197                    _________________4______
 198                    ___________________2____
 199                    ____________________33__
 200                    ______________________4_
 201         */
 202         /* if there's only one memory region, don't bother */
 203         if (*pnr_map < 2)
 204                 return -1;
 205
 206         old_nr = *pnr_map;
 207
 208         /* bail out if we find any unreasonable addresses in memmap */
 209         for (i = 0; i < old_nr; i++)
 210                 if (map[i].addr + map[i].size < map[i].addr)
 211                         return -1;
 212
 213         /* create pointers for initial change-point information (for sorting) */
 214         for (i = 0; i < 2*old_nr; i++)
 215                 change_point[i] = &change_point_list[i];
 216
 217         /* record all known change-points (starting and ending addresses),
 218            omitting those that are for empty memory regions */
 219         chgidx = 0;
 220         for (i = 0; i < old_nr; i++)    {
 221                 if (map[i].size != 0) {
 222                         change_point[chgidx]->addr = map[i].addr;
 223                         change_point[chgidx++]->pentry = &map[i];
 224                         change_point[chgidx]->addr = map[i].addr + map[i].size;
 225                         change_point[chgidx++]->pentry = &map[i];
 226                 }
 227         }
 228         chg_nr = chgidx;        /* true number of change-points */
 229
 230         /* sort change-point list by memory addresses (low -> high) */
 231         still_changing = 1;
 232         while (still_changing)  {
 233                 still_changing = 0;
 234                 for (i = 1; i < chg_nr; i++)  {
 235                         /* if <current_addr> > <last_addr>, swap */
 236                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 237                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 238                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 239                                  (change_point[i]->addr == change_point[i]->pentry->addr) &&
 240                                  (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
 241                            ) {
 242                                 change_tmp = change_point[i];
 243                                 change_point[i] = change_point[i-1];
 244                                 change_point[i-1] = change_tmp;
 245                                 still_changing = 1;
 246                         }
 247                 }
 248         }
 249
 250         /* create a new memmap, removing overlaps */
 251         overlap_entries = 0;     /* number of entries in the overlap table */
 252         new_entry = 0;   /* index for creating new memmap entries */
 253         last_type = 0;           /* start with undefined memory type */
 254         last_addr = 0;           /* start with 0 as last starting address */
 255         /* loop through change-points, determining affect on the new memmap */
 256         for (chgidx = 0; chgidx < chg_nr; chgidx++) {
 257                 /* keep track of all overlapping memmap entries */
 258                 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
 259                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 260                         overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
 261                 } else {
 262                         /* remove entry from list (order independent, so swap with last) */
 263                         for (i = 0; i < overlap_entries; i++) {
 264                                 if (overlap_list[i] == change_point[chgidx]->pentry)
 265                                         overlap_list[i] = overlap_list[overlap_entries-1];
 266                         }
 267                         overlap_entries--;
 268                 }
 269                 /* if there are overlapping entries, decide which "type" to use */
 270                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 271                 current_type = 0;
 272                 for (i = 0; i < overlap_entries; i++)
 273                         if (overlap_list[i]->type > current_type)
 274                                 current_type = overlap_list[i]->type;
 275                 /* continue building up new memmap based on this information */
 276                 if (current_type != last_type)  {
 277                         if (last_type != 0) {
 278                                 new_map[new_entry].size =
 279                                         change_point[chgidx]->addr - last_addr;
 280                                 /* move forward only if the new size was non-zero */
 281                                 if (new_map[new_entry].size != 0)
 282                                         if (++new_entry >= BFIN_MEMMAP_MAX)
 283                                                 break;  /* no more space left for new entries */
 284                         }
 285                         if (current_type != 0) {
 286                                 new_map[new_entry].addr = change_point[chgidx]->addr;
 287                                 new_map[new_entry].type = current_type;
 288                                 last_addr = change_point[chgidx]->addr;
 289                         }
 290                         last_type = current_type;
 291                 }
 292         }
 293         new_nr = new_entry;   /* retain count for new entries */
 294
 295         /* copy new  mapping into original location */
 296         memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
 297         *pnr_map = new_nr;
 298
 299         return 0;
 300 }
 301
 302 static void __init print_memory_map(char *who)
 303 {
 304         int i;
 305
 306         for (i = 0; i < bfin_memmap.nr_map; i++) {
 307                 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
 308                         bfin_memmap.map[i].addr,
 309                         bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
 310                 switch (bfin_memmap.map[i].type) {
 311                 case BFIN_MEMMAP_RAM:
 312                                 printk("(usable)\n");
 313                                 break;
 314                 case BFIN_MEMMAP_RESERVED:
 315                                 printk("(reserved)\n");
 316                                 break;
 317                 default:        printk("type %lu\n", bfin_memmap.map[i].type);
 318                                 break;
 319                 }
 320         }
 321 }
 322
 323 static __init int parse_memmap(char *arg)
 324 {
 325         unsigned long long start_at, mem_size;
 326
 327         if (!arg)
 328                 return -EINVAL;
 329
 330         mem_size = memparse(arg, &arg);
 331         if (*arg == '@') {
 332                 start_at = memparse(arg+1, &arg);
 333                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 334         } else if (*arg == '$') {
 335                 start_at = memparse(arg+1, &arg);
 336                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 337         }
 338
 339         return 0;
 340 }
 341
 342 /*
 343  * Initial parsing of the command line.  Currently, we support:
 344  *  - Controlling the linux memory size: mem=xxx[KMG]
 345  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 346  *       $ -> reserved memory is dcacheable
 347  *       # -> reserved memory is icacheable
 348  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 349  *       @ from <start> to <start>+<mem>, type RAM
 350  *       $ from <start> to <start>+<mem>, type RESERVED
 351  *
 352  */
 353 static __init void parse_cmdline_early(char *cmdline_p)
 354 {
 355         char c = ' ', *to = cmdline_p;
 356         unsigned int memsize;
 357         for (;;) {
 358                 if (c == ' ') {
 359                         if (!memcmp(to, "mem=", 4)) {
 360                                 to += 4;
 361                                 memsize = memparse(to, &to);
 362                                 if (memsize)
 363                                         _ramend = memsize;
 364
 365                         } else if (!memcmp(to, "max_mem=", 8)) {
 366                                 to += 8;
 367                                 memsize = memparse(to, &to);
 368                                 if (memsize) {
 369                                         physical_mem_end = memsize;
 370                                         if (*to != ' ') {
 371                                                 if (*to == '$'
 372                                                     || *(to + 1) == '$')
 373                                                         reserved_mem_dcache_on =
 374                                                             1;
 375                                                 if (*to == '#'
 376                                                     || *(to + 1) == '#')
 377                                                         reserved_mem_icache_on =
 378                                                             1;
 379                                         }
 380                                 }
 381                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 382                                 to += 12;
 383                                 setup_early_printk(to);
 384                         } else if (!memcmp(to, "memmap=", 7)) {
 385                                 to += 7;
 386                                 parse_memmap(to);
 387                         }
 388                 }
 389                 c = *(to++);
 390                 if (!c)
 391                         break;
 392         }
 393 }
 394
 395 /*
 396  * Setup memory defaults from user config.
 397  * The physical memory layout looks like:
 398  *
 399  *  [_rambase, _ramstart]:              kernel image
 400  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 401  *  [memory_end, _ramend]:              reserved memory
 402  *      [meory_mtd_start(memory_end),
 403  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 404  *      [_ramend - DMA_UNCACHED_REGION,
 405  *              _ramend]:                       uncached DMA region
 406  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 407  *
 408  */
 409 static __init void  memory_setup(void)
 410 {
 411 #ifdef CONFIG_MTD_UCLINUX
 412         unsigned long mtd_phys = 0;
 413 #endif
 414
 415         _rambase = (unsigned long)_stext;
 416         _ramstart = (unsigned long)_end;
 417
 418         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 419                 console_init();
 420                 panic("DMA region exceeds memory limit: %lu.\n",
 421                         _ramend - _ramstart);
 422         }
 423         memory_end = _ramend - DMA_UNCACHED_REGION;
 424
 425 #ifdef CONFIG_MPU
 426         /* Round up to multiple of 4MB.  */
 427         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 428 #else
 429         memory_start = PAGE_ALIGN(_ramstart);
 430 #endif
 431
 432 #if defined(CONFIG_MTD_UCLINUX)
 433         /* generic memory mapped MTD driver */
 434         memory_mtd_end = memory_end;
 435
 436         mtd_phys = _ramstart;
 437         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 438
 439 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 440         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 441                 mtd_size =
 442                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 443 # endif
 444
 445 # if defined(CONFIG_CRAMFS)
 446         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 447                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 448 # endif
 449
 450 # if defined(CONFIG_ROMFS_FS)
 451         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 452             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 453                 mtd_size =
 454                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 455 #  if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 456         /* Due to a Hardware Anomaly we need to limit the size of usable
 457          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 458          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 459          */
 460 #   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 461         if (memory_end >= 56 * 1024 * 1024)
 462                 memory_end = 56 * 1024 * 1024;
 463 #   else
 464         if (memory_end >= 60 * 1024 * 1024)
 465                 memory_end = 60 * 1024 * 1024;
 466 #   endif                               /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 467 #  endif                                /* ANOMALY_05000263 */
 468 # endif                         /* CONFIG_ROMFS_FS */
 469
 470         memory_end -= mtd_size;
 471
 472         if (mtd_size == 0) {
 473                 console_init();
 474                 panic("Don't boot kernel without rootfs attached.\n");
 475         }
 476
 477         /* Relocate MTD image to the top of memory after the uncached memory area */
 478         dma_memcpy((char *)memory_end, _end, mtd_size);
 479
 480         memory_mtd_start = memory_end;
 481         _ebss = memory_mtd_start;       /* define _ebss for compatible */
 482 #endif                          /* CONFIG_MTD_UCLINUX */
 483
 484 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 485         /* Due to a Hardware Anomaly we need to limit the size of usable
 486          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 487          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 488          */
 489 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 490         if (memory_end >= 56 * 1024 * 1024)
 491                 memory_end = 56 * 1024 * 1024;
 492 #else
 493         if (memory_end >= 60 * 1024 * 1024)
 494                 memory_end = 60 * 1024 * 1024;
 495 #endif                          /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 496         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 497 #endif                          /* ANOMALY_05000263 */
 498
 499 #ifdef CONFIG_MPU
 500         page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
 501         page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
 502 #endif
 503
 504 #if !defined(CONFIG_MTD_UCLINUX)
 505         /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 506         memory_end -= SIZE_4K;
 507 #endif
 508
 509         init_mm.start_code = (unsigned long)_stext;
 510         init_mm.end_code = (unsigned long)_etext;
 511         init_mm.end_data = (unsigned long)_edata;
 512         init_mm.brk = (unsigned long)0;
 513
 514         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 515         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 516
 517         printk(KERN_INFO "Memory map:\n"
 518                 KERN_INFO "  fixedcode = 0x%p-0x%p\n"
 519                 KERN_INFO "  text      = 0x%p-0x%p\n"
 520                 KERN_INFO "  rodata    = 0x%p-0x%p\n"
 521                 KERN_INFO "  bss       = 0x%p-0x%p\n"
 522                 KERN_INFO "  data      = 0x%p-0x%p\n"
 523                 KERN_INFO "    stack   = 0x%p-0x%p\n"
 524                 KERN_INFO "  init      = 0x%p-0x%p\n"
 525                 KERN_INFO "  available = 0x%p-0x%p\n"
 526 #ifdef CONFIG_MTD_UCLINUX
 527                 KERN_INFO "  rootfs    = 0x%p-0x%p\n"
 528 #endif
 529 #if DMA_UNCACHED_REGION > 0
 530                 KERN_INFO "  DMA Zone  = 0x%p-0x%p\n"
 531 #endif
 532                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 533                 _stext, _etext,
 534                 __start_rodata, __end_rodata,
 535                 __bss_start, __bss_stop,
 536                 _sdata, _edata,
 537                 (void *)&init_thread_union,
 538                 (void *)((int)(&init_thread_union) + 0x2000),
 539                 __init_begin, __init_end,
 540                 (void *)_ramstart, (void *)memory_end
 541 #ifdef CONFIG_MTD_UCLINUX
 542                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 543 #endif
 544 #if DMA_UNCACHED_REGION > 0
 545                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 546 #endif
 547                 );
 548 }
 549
 550 /*
 551  * Find the lowest, highest page frame number we have available
 552  */
 553 void __init find_min_max_pfn(void)
 554 {
 555         int i;
 556
 557         max_pfn = 0;
 558         min_low_pfn = memory_end;
 559
 560         for (i = 0; i < bfin_memmap.nr_map; i++) {
 561                 unsigned long start, end;
 562                 /* RAM? */
 563                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 564                         continue;
 565                 start = PFN_UP(bfin_memmap.map[i].addr);
 566                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 567                                 bfin_memmap.map[i].size);
 568                 if (start >= end)
 569                         continue;
 570                 if (end > max_pfn)
 571                         max_pfn = end;
 572                 if (start < min_low_pfn)
 573                         min_low_pfn = start;
 574         }
 575 }
 576
 577 static __init void setup_bootmem_allocator(void)
 578 {
 579         int bootmap_size;
 580         int i;
 581         unsigned long start_pfn, end_pfn;
 582         unsigned long curr_pfn, last_pfn, size;
 583
 584         /* mark memory between memory_start and memory_end usable */
 585         add_memory_region(memory_start,
 586                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 587         /* sanity check for overlap */
 588         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 589         print_memory_map("boot memmap");
 590
 591         /* intialize globals in linux/bootmem.h */
 592         find_min_max_pfn();
 593         /* pfn of the last usable page frame */
 594         if (max_pfn > memory_end >> PAGE_SHIFT)
 595                 max_pfn = memory_end >> PAGE_SHIFT;
 596         /* pfn of last page frame directly mapped by kernel */
 597         max_low_pfn = max_pfn;
 598         /* pfn of the first usable page frame after kernel image*/
 599         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 600                 min_low_pfn = memory_start >> PAGE_SHIFT;
 601
 602         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 603         end_pfn = memory_end >> PAGE_SHIFT;
 604
 605         /*
 606          * give all the memory to the bootmap allocator,  tell it to put the
 607          * boot mem_map at the start of memory.
 608          */
 609         bootmap_size = init_bootmem_node(NODE_DATA(0),
 610                         memory_start >> PAGE_SHIFT,     /* map goes here */
 611                         start_pfn, end_pfn);
 612
 613         /* register the memmap regions with the bootmem allocator */
 614         for (i = 0; i < bfin_memmap.nr_map; i++) {
 615                 /*
 616                  * Reserve usable memory
 617                  */
 618                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 619                         continue;
 620                 /*
 621                  * We are rounding up the start address of usable memory:
 622                  */
 623                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 624                 if (curr_pfn >= end_pfn)
 625                         continue;
 626                 /*
 627                  * ... and at the end of the usable range downwards:
 628                  */
 629                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 630                                          bfin_memmap.map[i].size);
 631
 632                 if (last_pfn > end_pfn)
 633                         last_pfn = end_pfn;
 634
 635                 /*
 636                  * .. finally, did all the rounding and playing
 637                  * around just make the area go away?
 638                  */
 639                 if (last_pfn <= curr_pfn)
 640                         continue;
 641
 642                 size = last_pfn - curr_pfn;
 643                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 644         }
 645
 646         /* reserve memory before memory_start, including bootmap */
 647         reserve_bootmem(PAGE_OFFSET,
 648                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 649                 BOOTMEM_DEFAULT);
 650 }
 651
 652 #define EBSZ_TO_MEG(ebsz) \
 653 ({ \
 654         int meg = 0; \
 655         switch (ebsz & 0xf) { \
 656                 case 0x1: meg =  16; break; \
 657                 case 0x3: meg =  32; break; \
 658                 case 0x5: meg =  64; break; \
 659                 case 0x7: meg = 128; break; \
 660                 case 0x9: meg = 256; break; \
 661                 case 0xb: meg = 512; break; \
 662         } \
 663         meg; \
 664 })
 665 static inline int __init get_mem_size(void)
 666 {
 667 #ifdef CONFIG_MEM_SIZE
 668         return CONFIG_MEM_SIZE;
 669 #else
 670 # if defined(EBIU_SDBCTL)
 671 #  if defined(BF561_FAMILY)
 672         int ret = 0;
 673         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 674         ret += EBSZ_TO_MEG(sdbctl >>  0);
 675         ret += EBSZ_TO_MEG(sdbctl >>  8);
 676         ret += EBSZ_TO_MEG(sdbctl >> 16);
 677         ret += EBSZ_TO_MEG(sdbctl >> 24);
 678         return ret;
 679 #  else
 680         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 681 #  endif
 682 # elif defined(EBIU_DDRCTL1)
 683         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 684         int ret = 0;
 685         switch (ddrctl & 0xc0000) {
 686                 case DEVSZ_64:  ret = 64 / 8;
 687                 case DEVSZ_128: ret = 128 / 8;
 688                 case DEVSZ_256: ret = 256 / 8;
 689                 case DEVSZ_512: ret = 512 / 8;
 690         }
 691         switch (ddrctl & 0x30000) {
 692                 case DEVWD_4:  ret *= 2;
 693                 case DEVWD_8:  ret *= 2;
 694                 case DEVWD_16: break;
 695         }
 696         return ret;
 697 # endif
 698 #endif
 699         BUG();
 700 }
 701
 702 void __init setup_arch(char **cmdline_p)
 703 {
 704         unsigned long sclk, cclk;
 705
 706 #ifdef CONFIG_DUMMY_CONSOLE
 707         conswitchp = &dummy_con;
 708 #endif
 709
 710 #if defined(CONFIG_CMDLINE_BOOL)
 711         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 712         command_line[sizeof(command_line) - 1] = 0;
 713 #endif
 714
 715         /* Keep a copy of command line */
 716         *cmdline_p = &command_line[0];
 717         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 718         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 719
 720         /* setup memory defaults from the user config */
 721         physical_mem_end = 0;
 722         _ramend = get_mem_size() * 1024 * 1024;
 723
 724         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 725
 726         parse_cmdline_early(&command_line[0]);
 727
 728         if (physical_mem_end == 0)
 729                 physical_mem_end = _ramend;
 730
 731         memory_setup();
 732
 733         cclk = get_cclk();
 734         sclk = get_sclk();
 735
 736 #if !defined(CONFIG_BFIN_KERNEL_CLOCK)
 737         if (ANOMALY_05000273 && cclk == sclk)
 738                 panic("ANOMALY 05000273, SCLK can not be same as CCLK");
 739 #endif
 740
 741 #ifdef BF561_FAMILY
 742         if (ANOMALY_05000266) {
 743                 bfin_read_IMDMA_D0_IRQ_STATUS();
 744                 bfin_read_IMDMA_D1_IRQ_STATUS();
 745         }
 746 #endif
 747         printk(KERN_INFO "Hardware Trace ");
 748         if (bfin_read_TBUFCTL() & 0x1)
 749                 printk("Active ");
 750         else
 751                 printk("Off ");
 752         if (bfin_read_TBUFCTL() & 0x2)
 753                 printk("and Enabled\n");
 754         else
 755         printk("and Disabled\n");
 756
 757 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
 758         /* we need to initialize the Flashrom device here since we might
 759          * do things with flash early on in the boot
 760          */
 761         flash_probe();
 762 #endif
 763
 764         _bfin_swrst = bfin_read_SWRST();
 765
 766         if (_bfin_swrst & RESET_DOUBLE)
 767                 printk(KERN_INFO "Recovering from Double Fault event\n");
 768         else if (_bfin_swrst & RESET_WDOG)
 769                 printk(KERN_INFO "Recovering from Watchdog event\n");
 770         else if (_bfin_swrst & RESET_SOFTWARE)
 771                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 772
 773         printk(KERN_INFO "Blackfin support (C) 2004-2008 Analog Devices, Inc.\n");
 774         if (bfin_compiled_revid() == 0xffff)
 775                 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
 776         else if (bfin_compiled_revid() == -1)
 777                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 778         else
 779                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 780         if (bfin_revid() != bfin_compiled_revid()) {
 781                 if (bfin_compiled_revid() == -1)
 782                         printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 783                                bfin_revid());
 784                 else if (bfin_compiled_revid() != 0xffff)
 785                         printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 786                                bfin_compiled_revid(), bfin_revid());
 787         }
 788         if (bfin_revid() < SUPPORTED_REVID)
 789                 printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 790                        CPU, bfin_revid());
 791         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 792
 793         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 794                cclk / 1000000,  sclk / 1000000);
 795
 796         if (ANOMALY_05000273 && (cclk >> 1) <= sclk)
 797                 printk("\n\n\nANOMALY_05000273: CCLK must be >= 2*SCLK !!!\n\n\n");
 798
 799         setup_bootmem_allocator();
 800
 801         paging_init();
 802
 803         /* Copy atomic sequences to their fixed location, and sanity check that
 804            these locations are the ones that we advertise to userspace.  */
 805         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 806                FIXED_CODE_END - FIXED_CODE_START);
 807         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 808                != SIGRETURN_STUB - FIXED_CODE_START);
 809         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 810                != ATOMIC_XCHG32 - FIXED_CODE_START);
 811         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 812                != ATOMIC_CAS32 - FIXED_CODE_START);
 813         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 814                != ATOMIC_ADD32 - FIXED_CODE_START);
 815         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 816                != ATOMIC_SUB32 - FIXED_CODE_START);
 817         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 818                != ATOMIC_IOR32 - FIXED_CODE_START);
 819         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 820                != ATOMIC_AND32 - FIXED_CODE_START);
 821         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 822                != ATOMIC_XOR32 - FIXED_CODE_START);
 823         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 824                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 825
 826         init_exception_vectors();
 827         bf53x_cache_init();
 828 }
 829
 830 static int __init topology_init(void)
 831 {
 832         int cpu;
 833
 834         for_each_possible_cpu(cpu) {
 835                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 836
 837                 register_cpu(c, cpu);
 838         }
 839
 840         return 0;
 841 }
 842
 843 subsys_initcall(topology_init);
 844
 845 static u_long get_vco(void)
 846 {
 847         u_long msel;
 848         u_long vco;
 849
 850         msel = (bfin_read_PLL_CTL() >> 9) & 0x3F;
 851         if (0 == msel)
 852                 msel = 64;
 853
 854         vco = CONFIG_CLKIN_HZ;
 855         vco >>= (1 & bfin_read_PLL_CTL());      /* DF bit */
 856         vco = msel * vco;
 857         return vco;
 858 }
 859
 860 /* Get the Core clock */
 861 u_long get_cclk(void)
 862 {
 863         u_long csel, ssel;
 864         if (bfin_read_PLL_STAT() & 0x1)
 865                 return CONFIG_CLKIN_HZ;
 866
 867         ssel = bfin_read_PLL_DIV();
 868         csel = ((ssel >> 4) & 0x03);
 869         ssel &= 0xf;
 870         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
 871                 return get_vco() / ssel;
 872         return get_vco() >> csel;
 873 }
 874 EXPORT_SYMBOL(get_cclk);
 875
 876 /* Get the System clock */
 877 u_long get_sclk(void)
 878 {
 879         u_long ssel;
 880
 881         if (bfin_read_PLL_STAT() & 0x1)
 882                 return CONFIG_CLKIN_HZ;
 883
 884         ssel = (bfin_read_PLL_DIV() & 0xf);
 885         if (0 == ssel) {
 886                 printk(KERN_WARNING "Invalid System Clock\n");
 887                 ssel = 1;
 888         }
 889
 890         return get_vco() / ssel;
 891 }
 892 EXPORT_SYMBOL(get_sclk);
 893
 894 unsigned long sclk_to_usecs(unsigned long sclk)
 895 {
 896         u64 tmp = USEC_PER_SEC * (u64)sclk;
 897         do_div(tmp, get_sclk());
 898         return tmp;
 899 }
 900 EXPORT_SYMBOL(sclk_to_usecs);
 901
 902 unsigned long usecs_to_sclk(unsigned long usecs)
 903 {
 904         u64 tmp = get_sclk() * (u64)usecs;
 905         do_div(tmp, USEC_PER_SEC);
 906         return tmp;
 907 }
 908 EXPORT_SYMBOL(usecs_to_sclk);
 909
 910 /*
 911  *      Get CPU information for use by the procfs.
 912  */
 913 static int show_cpuinfo(struct seq_file *m, void *v)
 914 {
 915         char *cpu, *mmu, *fpu, *vendor, *cache;
 916         uint32_t revid;
 917
 918         u_long cclk = 0, sclk = 0;
 919         u_int dcache_size = 0, dsup_banks = 0;
 920
 921         cpu = CPU;
 922         mmu = "none";
 923         fpu = "none";
 924         revid = bfin_revid();
 925
 926         cclk = get_cclk();
 927         sclk = get_sclk();
 928
 929         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
 930         case 0xca:
 931                 vendor = "Analog Devices";
 932                 break;
 933         default:
 934                 vendor = "unknown";
 935                 break;
 936         }
 937
 938         seq_printf(m, "processor\t: %d\n"
 939                 "vendor_id\t: %s\n"
 940                 "cpu family\t: 0x%x\n"
 941                 "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
 942                 "stepping\t: %d\n",
 943                 0,
 944                 vendor,
 945                 (bfin_read_CHIPID() & CHIPID_FAMILY),
 946                 cpu, cclk/1000000, sclk/1000000,
 947 #ifdef CONFIG_MPU
 948                 "mpu on",
 949 #else
 950                 "mpu off",
 951 #endif
 952                 revid);
 953
 954         seq_printf(m, "cpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
 955                 cclk/1000000, cclk%1000000,
 956                 sclk/1000000, sclk%1000000);
 957         seq_printf(m, "bogomips\t: %lu.%02lu\n"
 958                 "Calibration\t: %lu loops\n",
 959                 (loops_per_jiffy * HZ) / 500000,
 960                 ((loops_per_jiffy * HZ) / 5000) % 100,
 961                 (loops_per_jiffy * HZ));
 962
 963         /* Check Cache configutation */
 964         switch (bfin_read_DMEM_CONTROL() & (1 << DMC0_P | 1 << DMC1_P)) {
 965         case ACACHE_BSRAM:
 966                 cache = "dbank-A/B\t: cache/sram";
 967                 dcache_size = 16;
 968                 dsup_banks = 1;
 969                 break;
 970         case ACACHE_BCACHE:
 971                 cache = "dbank-A/B\t: cache/cache";
 972                 dcache_size = 32;
 973                 dsup_banks = 2;
 974                 break;
 975         case ASRAM_BSRAM:
 976                 cache = "dbank-A/B\t: sram/sram";
 977                 dcache_size = 0;
 978                 dsup_banks = 0;
 979                 break;
 980         default:
 981                 cache = "unknown";
 982                 dcache_size = 0;
 983                 dsup_banks = 0;
 984                 break;
 985         }
 986
 987         /* Is it turned on? */
 988         if (!((bfin_read_DMEM_CONTROL()) & (ENDCPLB | DMC_ENABLE)))
 989                 dcache_size = 0;
 990
 991         seq_printf(m, "cache size\t: %d KB(L1 icache) "
 992                 "%d KB(L1 dcache-%s) %d KB(L2 cache)\n",
 993                 BFIN_ICACHESIZE / 1024, dcache_size,
 994 #if defined CONFIG_BFIN_WB
 995                 "wb"
 996 #elif defined CONFIG_BFIN_WT
 997                 "wt"
 998 #endif
 999                 "", 0);
1000
1001         seq_printf(m, "%s\n", cache);
1002
1003         seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1004                    BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1005         seq_printf(m,
1006                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1007                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1008                    BFIN_DLINES);
1009 #ifdef CONFIG_BFIN_ICACHE_LOCK
1010         switch (read_iloc()) {
1011         case WAY0_L:
1012                 seq_printf(m, "Way0 Locked-Down\n");
1013                 break;
1014         case WAY1_L:
1015                 seq_printf(m, "Way1 Locked-Down\n");
1016                 break;
1017         case WAY01_L:
1018                 seq_printf(m, "Way0,Way1 Locked-Down\n");
1019                 break;
1020         case WAY2_L:
1021                 seq_printf(m, "Way2 Locked-Down\n");
1022                 break;
1023         case WAY02_L:
1024                 seq_printf(m, "Way0,Way2 Locked-Down\n");
1025                 break;
1026         case WAY12_L:
1027                 seq_printf(m, "Way1,Way2 Locked-Down\n");
1028                 break;
1029         case WAY012_L:
1030                 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1031                 break;
1032         case WAY3_L:
1033                 seq_printf(m, "Way3 Locked-Down\n");
1034                 break;
1035         case WAY03_L:
1036                 seq_printf(m, "Way0,Way3 Locked-Down\n");
1037                 break;
1038         case WAY13_L:
1039                 seq_printf(m, "Way1,Way3 Locked-Down\n");
1040                 break;
1041         case WAY013_L:
1042                 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1043                 break;
1044         case WAY32_L:
1045                 seq_printf(m, "Way3,Way2 Locked-Down\n");
1046                 break;
1047         case WAY320_L:
1048                 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1049                 break;
1050         case WAY321_L:
1051                 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1052                 break;
1053         case WAYALL_L:
1054                 seq_printf(m, "All Ways are locked\n");
1055                 break;
1056         default:
1057                 seq_printf(m, "No Ways are locked\n");
1058         }
1059 #endif
1060         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1061         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1062                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1063         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1064                 ((int)memory_end - (int)_stext) >> 10,
1065                 _stext,
1066                 (void *)memory_end);
1067
1068         return 0;
1069 }
1070
1071 static void *c_start(struct seq_file *m, loff_t *pos)
1072 {
1073         return *pos < NR_CPUS ? ((void *)0x12345678) : NULL;
1074 }
1075
1076 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1077 {
1078         ++*pos;
1079         return c_start(m, pos);
1080 }
1081
1082 static void c_stop(struct seq_file *m, void *v)
1083 {
1084 }
1085
1086 const struct seq_operations cpuinfo_op = {
1087         .start = c_start,
1088         .next = c_next,
1089         .stop = c_stop,
1090         .show = show_cpuinfo,
1091 };
1092
1093 void __init cmdline_init(const char *r0)
1094 {
1095         if (r0)
1096                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1097 }