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         unsigned long l2_length;
 108
 109         l1_code_length = _etext_l1 - _stext_l1;
 110         if (l1_code_length > L1_CODE_LENGTH)
 111                 panic("L1 Instruction SRAM Overflow\n");
 112         /* cannot complain as printk is not available as yet.
 113          * But we can continue booting and complain later!
 114          */
 115
 116         /* Copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
 117         dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
 118
 119         l1_data_a_length = _ebss_l1 - _sdata_l1;
 120         if (l1_data_a_length > L1_DATA_A_LENGTH)
 121                 panic("L1 Data SRAM Bank A Overflow\n");
 122
 123         /* Copy _sdata_l1 to _ebss_l1 to L1 data bank A SRAM */
 124         dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
 125
 126         l1_data_b_length = _ebss_b_l1 - _sdata_b_l1;
 127         if (l1_data_b_length > L1_DATA_B_LENGTH)
 128                 panic("L1 Data SRAM Bank B Overflow\n");
 129
 130         /* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
 131         dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
 132                         l1_data_a_length, l1_data_b_length);
 133
 134 #ifdef L2_LENGTH
 135         l2_length = _ebss_l2 - _stext_l2;
 136         if (l2_length > L2_LENGTH)
 137                 panic("L2 SRAM Overflow\n");
 138
 139         /* Copy _stext_l2 to _edata_l2 to L2 SRAM */
 140         dma_memcpy(_stext_l2, _l2_lma_start, l2_length);
 141 #endif
 142 }
 143
 144 /* add_memory_region to memmap */
 145 static void __init add_memory_region(unsigned long long start,
 146                               unsigned long long size, int type)
 147 {
 148         int i;
 149
 150         i = bfin_memmap.nr_map;
 151
 152         if (i == BFIN_MEMMAP_MAX) {
 153                 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 154                 return;
 155         }
 156
 157         bfin_memmap.map[i].addr = start;
 158         bfin_memmap.map[i].size = size;
 159         bfin_memmap.map[i].type = type;
 160         bfin_memmap.nr_map++;
 161 }
 162
 163 /*
 164  * Sanitize the boot memmap, removing overlaps.
 165  */
 166 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
 167 {
 168         struct change_member *change_tmp;
 169         unsigned long current_type, last_type;
 170         unsigned long long last_addr;
 171         int chgidx, still_changing;
 172         int overlap_entries;
 173         int new_entry;
 174         int old_nr, new_nr, chg_nr;
 175         int i;
 176
 177         /*
 178                 Visually we're performing the following (1,2,3,4 = memory types)
 179
 180                 Sample memory map (w/overlaps):
 181                    ____22__________________
 182                    ______________________4_
 183                    ____1111________________
 184                    _44_____________________
 185                    11111111________________
 186                    ____________________33__
 187                    ___________44___________
 188                    __________33333_________
 189                    ______________22________
 190                    ___________________2222_
 191                    _________111111111______
 192                    _____________________11_
 193                    _________________4______
 194
 195                 Sanitized equivalent (no overlap):
 196                    1_______________________
 197                    _44_____________________
 198                    ___1____________________
 199                    ____22__________________
 200                    ______11________________
 201                    _________1______________
 202                    __________3_____________
 203                    ___________44___________
 204                    _____________33_________
 205                    _______________2________
 206                    ________________1_______
 207                    _________________4______
 208                    ___________________2____
 209                    ____________________33__
 210                    ______________________4_
 211         */
 212         /* if there's only one memory region, don't bother */
 213         if (*pnr_map < 2)
 214                 return -1;
 215
 216         old_nr = *pnr_map;
 217
 218         /* bail out if we find any unreasonable addresses in memmap */
 219         for (i = 0; i < old_nr; i++)
 220                 if (map[i].addr + map[i].size < map[i].addr)
 221                         return -1;
 222
 223         /* create pointers for initial change-point information (for sorting) */
 224         for (i = 0; i < 2*old_nr; i++)
 225                 change_point[i] = &change_point_list[i];
 226
 227         /* record all known change-points (starting and ending addresses),
 228            omitting those that are for empty memory regions */
 229         chgidx = 0;
 230         for (i = 0; i < old_nr; i++)    {
 231                 if (map[i].size != 0) {
 232                         change_point[chgidx]->addr = map[i].addr;
 233                         change_point[chgidx++]->pentry = &map[i];
 234                         change_point[chgidx]->addr = map[i].addr + map[i].size;
 235                         change_point[chgidx++]->pentry = &map[i];
 236                 }
 237         }
 238         chg_nr = chgidx;        /* true number of change-points */
 239
 240         /* sort change-point list by memory addresses (low -> high) */
 241         still_changing = 1;
 242         while (still_changing)  {
 243                 still_changing = 0;
 244                 for (i = 1; i < chg_nr; i++)  {
 245                         /* if <current_addr> > <last_addr>, swap */
 246                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 247                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 248                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 249                                  (change_point[i]->addr == change_point[i]->pentry->addr) &&
 250                                  (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
 251                            ) {
 252                                 change_tmp = change_point[i];
 253                                 change_point[i] = change_point[i-1];
 254                                 change_point[i-1] = change_tmp;
 255                                 still_changing = 1;
 256                         }
 257                 }
 258         }
 259
 260         /* create a new memmap, removing overlaps */
 261         overlap_entries = 0;     /* number of entries in the overlap table */
 262         new_entry = 0;   /* index for creating new memmap entries */
 263         last_type = 0;           /* start with undefined memory type */
 264         last_addr = 0;           /* start with 0 as last starting address */
 265         /* loop through change-points, determining affect on the new memmap */
 266         for (chgidx = 0; chgidx < chg_nr; chgidx++) {
 267                 /* keep track of all overlapping memmap entries */
 268                 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
 269                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 270                         overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
 271                 } else {
 272                         /* remove entry from list (order independent, so swap with last) */
 273                         for (i = 0; i < overlap_entries; i++) {
 274                                 if (overlap_list[i] == change_point[chgidx]->pentry)
 275                                         overlap_list[i] = overlap_list[overlap_entries-1];
 276                         }
 277                         overlap_entries--;
 278                 }
 279                 /* if there are overlapping entries, decide which "type" to use */
 280                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 281                 current_type = 0;
 282                 for (i = 0; i < overlap_entries; i++)
 283                         if (overlap_list[i]->type > current_type)
 284                                 current_type = overlap_list[i]->type;
 285                 /* continue building up new memmap based on this information */
 286                 if (current_type != last_type)  {
 287                         if (last_type != 0) {
 288                                 new_map[new_entry].size =
 289                                         change_point[chgidx]->addr - last_addr;
 290                                 /* move forward only if the new size was non-zero */
 291                                 if (new_map[new_entry].size != 0)
 292                                         if (++new_entry >= BFIN_MEMMAP_MAX)
 293                                                 break;  /* no more space left for new entries */
 294                         }
 295                         if (current_type != 0) {
 296                                 new_map[new_entry].addr = change_point[chgidx]->addr;
 297                                 new_map[new_entry].type = current_type;
 298                                 last_addr = change_point[chgidx]->addr;
 299                         }
 300                         last_type = current_type;
 301                 }
 302         }
 303         new_nr = new_entry;   /* retain count for new entries */
 304
 305         /* copy new  mapping into original location */
 306         memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
 307         *pnr_map = new_nr;
 308
 309         return 0;
 310 }
 311
 312 static void __init print_memory_map(char *who)
 313 {
 314         int i;
 315
 316         for (i = 0; i < bfin_memmap.nr_map; i++) {
 317                 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
 318                         bfin_memmap.map[i].addr,
 319                         bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
 320                 switch (bfin_memmap.map[i].type) {
 321                 case BFIN_MEMMAP_RAM:
 322                                 printk("(usable)\n");
 323                                 break;
 324                 case BFIN_MEMMAP_RESERVED:
 325                                 printk("(reserved)\n");
 326                                 break;
 327                 default:        printk("type %lu\n", bfin_memmap.map[i].type);
 328                                 break;
 329                 }
 330         }
 331 }
 332
 333 static __init int parse_memmap(char *arg)
 334 {
 335         unsigned long long start_at, mem_size;
 336
 337         if (!arg)
 338                 return -EINVAL;
 339
 340         mem_size = memparse(arg, &arg);
 341         if (*arg == '@') {
 342                 start_at = memparse(arg+1, &arg);
 343                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 344         } else if (*arg == '$') {
 345                 start_at = memparse(arg+1, &arg);
 346                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 347         }
 348
 349         return 0;
 350 }
 351
 352 /*
 353  * Initial parsing of the command line.  Currently, we support:
 354  *  - Controlling the linux memory size: mem=xxx[KMG]
 355  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 356  *       $ -> reserved memory is dcacheable
 357  *       # -> reserved memory is icacheable
 358  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 359  *       @ from <start> to <start>+<mem>, type RAM
 360  *       $ from <start> to <start>+<mem>, type RESERVED
 361  *
 362  */
 363 static __init void parse_cmdline_early(char *cmdline_p)
 364 {
 365         char c = ' ', *to = cmdline_p;
 366         unsigned int memsize;
 367         for (;;) {
 368                 if (c == ' ') {
 369                         if (!memcmp(to, "mem=", 4)) {
 370                                 to += 4;
 371                                 memsize = memparse(to, &to);
 372                                 if (memsize)
 373                                         _ramend = memsize;
 374
 375                         } else if (!memcmp(to, "max_mem=", 8)) {
 376                                 to += 8;
 377                                 memsize = memparse(to, &to);
 378                                 if (memsize) {
 379                                         physical_mem_end = memsize;
 380                                         if (*to != ' ') {
 381                                                 if (*to == '$'
 382                                                     || *(to + 1) == '$')
 383                                                         reserved_mem_dcache_on =
 384                                                             1;
 385                                                 if (*to == '#'
 386                                                     || *(to + 1) == '#')
 387                                                         reserved_mem_icache_on =
 388                                                             1;
 389                                         }
 390                                 }
 391                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 392                                 to += 12;
 393                                 setup_early_printk(to);
 394                         } else if (!memcmp(to, "memmap=", 7)) {
 395                                 to += 7;
 396                                 parse_memmap(to);
 397                         }
 398                 }
 399                 c = *(to++);
 400                 if (!c)
 401                         break;
 402         }
 403 }
 404
 405 /*
 406  * Setup memory defaults from user config.
 407  * The physical memory layout looks like:
 408  *
 409  *  [_rambase, _ramstart]:              kernel image
 410  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 411  *  [memory_end, _ramend]:              reserved memory
 412  *      [meory_mtd_start(memory_end),
 413  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 414  *      [_ramend - DMA_UNCACHED_REGION,
 415  *              _ramend]:                       uncached DMA region
 416  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 417  *
 418  */
 419 static __init void  memory_setup(void)
 420 {
 421 #ifdef CONFIG_MTD_UCLINUX
 422         unsigned long mtd_phys = 0;
 423 #endif
 424
 425         _rambase = (unsigned long)_stext;
 426         _ramstart = (unsigned long)_end;
 427
 428         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 429                 console_init();
 430                 panic("DMA region exceeds memory limit: %lu.\n",
 431                         _ramend - _ramstart);
 432         }
 433         memory_end = _ramend - DMA_UNCACHED_REGION;
 434
 435 #ifdef CONFIG_MPU
 436         /* Round up to multiple of 4MB.  */
 437         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 438 #else
 439         memory_start = PAGE_ALIGN(_ramstart);
 440 #endif
 441
 442 #if defined(CONFIG_MTD_UCLINUX)
 443         /* generic memory mapped MTD driver */
 444         memory_mtd_end = memory_end;
 445
 446         mtd_phys = _ramstart;
 447         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 448
 449 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 450         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 451                 mtd_size =
 452                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 453 # endif
 454
 455 # if defined(CONFIG_CRAMFS)
 456         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 457                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 458 # endif
 459
 460 # if defined(CONFIG_ROMFS_FS)
 461         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 462             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 463                 mtd_size =
 464                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 465 #  if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 466         /* Due to a Hardware Anomaly we need to limit the size of usable
 467          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 468          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 469          */
 470 #   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 471         if (memory_end >= 56 * 1024 * 1024)
 472                 memory_end = 56 * 1024 * 1024;
 473 #   else
 474         if (memory_end >= 60 * 1024 * 1024)
 475                 memory_end = 60 * 1024 * 1024;
 476 #   endif                               /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 477 #  endif                                /* ANOMALY_05000263 */
 478 # endif                         /* CONFIG_ROMFS_FS */
 479
 480         memory_end -= mtd_size;
 481
 482         if (mtd_size == 0) {
 483                 console_init();
 484                 panic("Don't boot kernel without rootfs attached.\n");
 485         }
 486
 487         /* Relocate MTD image to the top of memory after the uncached memory area */
 488         dma_memcpy((char *)memory_end, _end, mtd_size);
 489
 490         memory_mtd_start = memory_end;
 491         _ebss = memory_mtd_start;       /* define _ebss for compatible */
 492 #endif                          /* CONFIG_MTD_UCLINUX */
 493
 494 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 495         /* Due to a Hardware Anomaly we need to limit the size of usable
 496          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 497          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 498          */
 499 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 500         if (memory_end >= 56 * 1024 * 1024)
 501                 memory_end = 56 * 1024 * 1024;
 502 #else
 503         if (memory_end >= 60 * 1024 * 1024)
 504                 memory_end = 60 * 1024 * 1024;
 505 #endif                          /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 506         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 507 #endif                          /* ANOMALY_05000263 */
 508
 509 #ifdef CONFIG_MPU
 510         page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
 511         page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
 512 #endif
 513
 514 #if !defined(CONFIG_MTD_UCLINUX)
 515         /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 516         memory_end -= SIZE_4K;
 517 #endif
 518
 519         init_mm.start_code = (unsigned long)_stext;
 520         init_mm.end_code = (unsigned long)_etext;
 521         init_mm.end_data = (unsigned long)_edata;
 522         init_mm.brk = (unsigned long)0;
 523
 524         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 525         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 526
 527         printk(KERN_INFO "Memory map:\n"
 528                 KERN_INFO "  fixedcode = 0x%p-0x%p\n"
 529                 KERN_INFO "  text      = 0x%p-0x%p\n"
 530                 KERN_INFO "  rodata    = 0x%p-0x%p\n"
 531                 KERN_INFO "  bss       = 0x%p-0x%p\n"
 532                 KERN_INFO "  data      = 0x%p-0x%p\n"
 533                 KERN_INFO "    stack   = 0x%p-0x%p\n"
 534                 KERN_INFO "  init      = 0x%p-0x%p\n"
 535                 KERN_INFO "  available = 0x%p-0x%p\n"
 536 #ifdef CONFIG_MTD_UCLINUX
 537                 KERN_INFO "  rootfs    = 0x%p-0x%p\n"
 538 #endif
 539 #if DMA_UNCACHED_REGION > 0
 540                 KERN_INFO "  DMA Zone  = 0x%p-0x%p\n"
 541 #endif
 542                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 543                 _stext, _etext,
 544                 __start_rodata, __end_rodata,
 545                 __bss_start, __bss_stop,
 546                 _sdata, _edata,
 547                 (void *)&init_thread_union,
 548                 (void *)((int)(&init_thread_union) + 0x2000),
 549                 __init_begin, __init_end,
 550                 (void *)_ramstart, (void *)memory_end
 551 #ifdef CONFIG_MTD_UCLINUX
 552                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 553 #endif
 554 #if DMA_UNCACHED_REGION > 0
 555                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 556 #endif
 557                 );
 558 }
 559
 560 /*
 561  * Find the lowest, highest page frame number we have available
 562  */
 563 void __init find_min_max_pfn(void)
 564 {
 565         int i;
 566
 567         max_pfn = 0;
 568         min_low_pfn = memory_end;
 569
 570         for (i = 0; i < bfin_memmap.nr_map; i++) {
 571                 unsigned long start, end;
 572                 /* RAM? */
 573                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 574                         continue;
 575                 start = PFN_UP(bfin_memmap.map[i].addr);
 576                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 577                                 bfin_memmap.map[i].size);
 578                 if (start >= end)
 579                         continue;
 580                 if (end > max_pfn)
 581                         max_pfn = end;
 582                 if (start < min_low_pfn)
 583                         min_low_pfn = start;
 584         }
 585 }
 586
 587 static __init void setup_bootmem_allocator(void)
 588 {
 589         int bootmap_size;
 590         int i;
 591         unsigned long start_pfn, end_pfn;
 592         unsigned long curr_pfn, last_pfn, size;
 593
 594         /* mark memory between memory_start and memory_end usable */
 595         add_memory_region(memory_start,
 596                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 597         /* sanity check for overlap */
 598         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 599         print_memory_map("boot memmap");
 600
 601         /* intialize globals in linux/bootmem.h */
 602         find_min_max_pfn();
 603         /* pfn of the last usable page frame */
 604         if (max_pfn > memory_end >> PAGE_SHIFT)
 605                 max_pfn = memory_end >> PAGE_SHIFT;
 606         /* pfn of last page frame directly mapped by kernel */
 607         max_low_pfn = max_pfn;
 608         /* pfn of the first usable page frame after kernel image*/
 609         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 610                 min_low_pfn = memory_start >> PAGE_SHIFT;
 611
 612         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 613         end_pfn = memory_end >> PAGE_SHIFT;
 614
 615         /*
 616          * give all the memory to the bootmap allocator,  tell it to put the
 617          * boot mem_map at the start of memory.
 618          */
 619         bootmap_size = init_bootmem_node(NODE_DATA(0),
 620                         memory_start >> PAGE_SHIFT,     /* map goes here */
 621                         start_pfn, end_pfn);
 622
 623         /* register the memmap regions with the bootmem allocator */
 624         for (i = 0; i < bfin_memmap.nr_map; i++) {
 625                 /*
 626                  * Reserve usable memory
 627                  */
 628                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 629                         continue;
 630                 /*
 631                  * We are rounding up the start address of usable memory:
 632                  */
 633                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 634                 if (curr_pfn >= end_pfn)
 635                         continue;
 636                 /*
 637                  * ... and at the end of the usable range downwards:
 638                  */
 639                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 640                                          bfin_memmap.map[i].size);
 641
 642                 if (last_pfn > end_pfn)
 643                         last_pfn = end_pfn;
 644
 645                 /*
 646                  * .. finally, did all the rounding and playing
 647                  * around just make the area go away?
 648                  */
 649                 if (last_pfn <= curr_pfn)
 650                         continue;
 651
 652                 size = last_pfn - curr_pfn;
 653                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 654         }
 655
 656         /* reserve memory before memory_start, including bootmap */
 657         reserve_bootmem(PAGE_OFFSET,
 658                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 659                 BOOTMEM_DEFAULT);
 660 }
 661
 662 #define EBSZ_TO_MEG(ebsz) \
 663 ({ \
 664         int meg = 0; \
 665         switch (ebsz & 0xf) { \
 666                 case 0x1: meg =  16; break; \
 667                 case 0x3: meg =  32; break; \
 668                 case 0x5: meg =  64; break; \
 669                 case 0x7: meg = 128; break; \
 670                 case 0x9: meg = 256; break; \
 671                 case 0xb: meg = 512; break; \
 672         } \
 673         meg; \
 674 })
 675 static inline int __init get_mem_size(void)
 676 {
 677 #if defined(EBIU_SDBCTL)
 678 # if defined(BF561_FAMILY)
 679         int ret = 0;
 680         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 681         ret += EBSZ_TO_MEG(sdbctl >>  0);
 682         ret += EBSZ_TO_MEG(sdbctl >>  8);
 683         ret += EBSZ_TO_MEG(sdbctl >> 16);
 684         ret += EBSZ_TO_MEG(sdbctl >> 24);
 685         return ret;
 686 # else
 687         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 688 # endif
 689 #elif defined(EBIU_DDRCTL1)
 690         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 691         int ret = 0;
 692         switch (ddrctl & 0xc0000) {
 693                 case DEVSZ_64:  ret = 64 / 8;
 694                 case DEVSZ_128: ret = 128 / 8;
 695                 case DEVSZ_256: ret = 256 / 8;
 696                 case DEVSZ_512: ret = 512 / 8;
 697         }
 698         switch (ddrctl & 0x30000) {
 699                 case DEVWD_4:  ret *= 2;
 700                 case DEVWD_8:  ret *= 2;
 701                 case DEVWD_16: break;
 702         }
 703         if ((ddrctl & 0xc000) == 0x4000)
 704                 ret *= 2;
 705         return ret;
 706 #endif
 707         BUG();
 708 }
 709
 710 void __init setup_arch(char **cmdline_p)
 711 {
 712         unsigned long sclk, cclk;
 713
 714 #ifdef CONFIG_DUMMY_CONSOLE
 715         conswitchp = &dummy_con;
 716 #endif
 717
 718 #if defined(CONFIG_CMDLINE_BOOL)
 719         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 720         command_line[sizeof(command_line) - 1] = 0;
 721 #endif
 722
 723         /* Keep a copy of command line */
 724         *cmdline_p = &command_line[0];
 725         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 726         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 727
 728         /* setup memory defaults from the user config */
 729         physical_mem_end = 0;
 730         _ramend = get_mem_size() * 1024 * 1024;
 731
 732         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 733
 734         parse_cmdline_early(&command_line[0]);
 735
 736         if (physical_mem_end == 0)
 737                 physical_mem_end = _ramend;
 738
 739         memory_setup();
 740
 741         cclk = get_cclk();
 742         sclk = get_sclk();
 743
 744 #if !defined(CONFIG_BFIN_KERNEL_CLOCK)
 745         if (ANOMALY_05000273 && cclk == sclk)
 746                 panic("ANOMALY 05000273, SCLK can not be same as CCLK");
 747 #endif
 748
 749 #ifdef BF561_FAMILY
 750         if (ANOMALY_05000266) {
 751                 bfin_read_IMDMA_D0_IRQ_STATUS();
 752                 bfin_read_IMDMA_D1_IRQ_STATUS();
 753         }
 754 #endif
 755         printk(KERN_INFO "Hardware Trace ");
 756         if (bfin_read_TBUFCTL() & 0x1)
 757                 printk("Active ");
 758         else
 759                 printk("Off ");
 760         if (bfin_read_TBUFCTL() & 0x2)
 761                 printk("and Enabled\n");
 762         else
 763         printk("and Disabled\n");
 764
 765 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
 766         /* we need to initialize the Flashrom device here since we might
 767          * do things with flash early on in the boot
 768          */
 769         flash_probe();
 770 #endif
 771
 772         _bfin_swrst = bfin_read_SWRST();
 773
 774         /* If we double fault, reset the system - otherwise we hang forever */
 775         bfin_write_SWRST(DOUBLE_FAULT);
 776
 777         if (_bfin_swrst & RESET_DOUBLE)
 778                 printk(KERN_INFO "Recovering from Double Fault event\n");
 779         else if (_bfin_swrst & RESET_WDOG)
 780                 printk(KERN_INFO "Recovering from Watchdog event\n");
 781         else if (_bfin_swrst & RESET_SOFTWARE)
 782                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 783
 784         printk(KERN_INFO "Blackfin support (C) 2004-2008 Analog Devices, Inc.\n");
 785         if (bfin_compiled_revid() == 0xffff)
 786                 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
 787         else if (bfin_compiled_revid() == -1)
 788                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 789         else
 790                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 791         if (bfin_revid() != bfin_compiled_revid()) {
 792                 if (bfin_compiled_revid() == -1)
 793                         printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 794                                bfin_revid());
 795                 else if (bfin_compiled_revid() != 0xffff)
 796                         printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 797                                bfin_compiled_revid(), bfin_revid());
 798         }
 799         if (bfin_revid() < SUPPORTED_REVID)
 800                 printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 801                        CPU, bfin_revid());
 802         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 803
 804         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 805                cclk / 1000000,  sclk / 1000000);
 806
 807         if (ANOMALY_05000273 && (cclk >> 1) <= sclk)
 808                 printk("\n\n\nANOMALY_05000273: CCLK must be >= 2*SCLK !!!\n\n\n");
 809
 810         setup_bootmem_allocator();
 811
 812         paging_init();
 813
 814         /* Copy atomic sequences to their fixed location, and sanity check that
 815            these locations are the ones that we advertise to userspace.  */
 816         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 817                FIXED_CODE_END - FIXED_CODE_START);
 818         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 819                != SIGRETURN_STUB - FIXED_CODE_START);
 820         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 821                != ATOMIC_XCHG32 - FIXED_CODE_START);
 822         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 823                != ATOMIC_CAS32 - FIXED_CODE_START);
 824         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 825                != ATOMIC_ADD32 - FIXED_CODE_START);
 826         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 827                != ATOMIC_SUB32 - FIXED_CODE_START);
 828         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 829                != ATOMIC_IOR32 - FIXED_CODE_START);
 830         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 831                != ATOMIC_AND32 - FIXED_CODE_START);
 832         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 833                != ATOMIC_XOR32 - FIXED_CODE_START);
 834         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 835                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 836
 837         init_exception_vectors();
 838         bf53x_cache_init();
 839 }
 840
 841 static int __init topology_init(void)
 842 {
 843         int cpu;
 844
 845         for_each_possible_cpu(cpu) {
 846                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 847
 848                 register_cpu(c, cpu);
 849         }
 850
 851         return 0;
 852 }
 853
 854 subsys_initcall(topology_init);
 855
 856 /* Get the voltage input multiplier */
 857 static u_long cached_vco_pll_ctl, cached_vco;
 858 static u_long get_vco(void)
 859 {
 860         u_long msel;
 861
 862         u_long pll_ctl = bfin_read_PLL_CTL();
 863         if (pll_ctl == cached_vco_pll_ctl)
 864                 return cached_vco;
 865         else
 866                 cached_vco_pll_ctl = pll_ctl;
 867
 868         msel = (pll_ctl >> 9) & 0x3F;
 869         if (0 == msel)
 870                 msel = 64;
 871
 872         cached_vco = CONFIG_CLKIN_HZ;
 873         cached_vco >>= (1 & pll_ctl);   /* DF bit */
 874         cached_vco *= msel;
 875         return cached_vco;
 876 }
 877
 878 /* Get the Core clock */
 879 static u_long cached_cclk_pll_div, cached_cclk;
 880 u_long get_cclk(void)
 881 {
 882         u_long csel, ssel;
 883
 884         if (bfin_read_PLL_STAT() & 0x1)
 885                 return CONFIG_CLKIN_HZ;
 886
 887         ssel = bfin_read_PLL_DIV();
 888         if (ssel == cached_cclk_pll_div)
 889                 return cached_cclk;
 890         else
 891                 cached_cclk_pll_div = ssel;
 892
 893         csel = ((ssel >> 4) & 0x03);
 894         ssel &= 0xf;
 895         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
 896                 cached_cclk = get_vco() / ssel;
 897         else
 898                 cached_cclk = get_vco() >> csel;
 899         return cached_cclk;
 900 }
 901 EXPORT_SYMBOL(get_cclk);
 902
 903 /* Get the System clock */
 904 static u_long cached_sclk_pll_div, cached_sclk;
 905 u_long get_sclk(void)
 906 {
 907         u_long ssel;
 908
 909         if (bfin_read_PLL_STAT() & 0x1)
 910                 return CONFIG_CLKIN_HZ;
 911
 912         ssel = bfin_read_PLL_DIV();
 913         if (ssel == cached_sclk_pll_div)
 914                 return cached_sclk;
 915         else
 916                 cached_sclk_pll_div = ssel;
 917
 918         ssel &= 0xf;
 919         if (0 == ssel) {
 920                 printk(KERN_WARNING "Invalid System Clock\n");
 921                 ssel = 1;
 922         }
 923
 924         cached_sclk = get_vco() / ssel;
 925         return cached_sclk;
 926 }
 927 EXPORT_SYMBOL(get_sclk);
 928
 929 unsigned long sclk_to_usecs(unsigned long sclk)
 930 {
 931         u64 tmp = USEC_PER_SEC * (u64)sclk;
 932         do_div(tmp, get_sclk());
 933         return tmp;
 934 }
 935 EXPORT_SYMBOL(sclk_to_usecs);
 936
 937 unsigned long usecs_to_sclk(unsigned long usecs)
 938 {
 939         u64 tmp = get_sclk() * (u64)usecs;
 940         do_div(tmp, USEC_PER_SEC);
 941         return tmp;
 942 }
 943 EXPORT_SYMBOL(usecs_to_sclk);
 944
 945 /*
 946  *      Get CPU information for use by the procfs.
 947  */
 948 static int show_cpuinfo(struct seq_file *m, void *v)
 949 {
 950         char *cpu, *mmu, *fpu, *vendor, *cache;
 951         uint32_t revid;
 952
 953         u_long cclk = 0, sclk = 0;
 954         u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
 955
 956         cpu = CPU;
 957         mmu = "none";
 958         fpu = "none";
 959         revid = bfin_revid();
 960
 961         cclk = get_cclk();
 962         sclk = get_sclk();
 963
 964         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
 965         case 0xca:
 966                 vendor = "Analog Devices";
 967                 break;
 968         default:
 969                 vendor = "unknown";
 970                 break;
 971         }
 972
 973         seq_printf(m, "processor\t: %d\n"
 974                 "vendor_id\t: %s\n"
 975                 "cpu family\t: 0x%x\n"
 976                 "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
 977                 "stepping\t: %d\n",
 978                 0,
 979                 vendor,
 980                 (bfin_read_CHIPID() & CHIPID_FAMILY),
 981                 cpu, cclk/1000000, sclk/1000000,
 982 #ifdef CONFIG_MPU
 983                 "mpu on",
 984 #else
 985                 "mpu off",
 986 #endif
 987                 revid);
 988
 989         seq_printf(m, "cpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
 990                 cclk/1000000, cclk%1000000,
 991                 sclk/1000000, sclk%1000000);
 992         seq_printf(m, "bogomips\t: %lu.%02lu\n"
 993                 "Calibration\t: %lu loops\n",
 994                 (loops_per_jiffy * HZ) / 500000,
 995                 ((loops_per_jiffy * HZ) / 5000) % 100,
 996                 (loops_per_jiffy * HZ));
 997
 998         /* Check Cache configutation */
 999         switch (bfin_read_DMEM_CONTROL() & (1 << DMC0_P | 1 << DMC1_P)) {
1000         case ACACHE_BSRAM:
1001                 cache = "dbank-A/B\t: cache/sram";
1002                 dcache_size = 16;
1003                 dsup_banks = 1;
1004                 break;
1005         case ACACHE_BCACHE:
1006                 cache = "dbank-A/B\t: cache/cache";
1007                 dcache_size = 32;
1008                 dsup_banks = 2;
1009                 break;
1010         case ASRAM_BSRAM:
1011                 cache = "dbank-A/B\t: sram/sram";
1012                 dcache_size = 0;
1013                 dsup_banks = 0;
1014                 break;
1015         default:
1016                 cache = "unknown";
1017                 dcache_size = 0;
1018                 dsup_banks = 0;
1019                 break;
1020         }
1021
1022         /* Is it turned on? */
1023         if ((bfin_read_DMEM_CONTROL() & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1024                 dcache_size = 0;
1025
1026         if ((bfin_read_IMEM_CONTROL() & (IMC | ENICPLB)) == (IMC | ENICPLB))
1027                 icache_size = 0;
1028
1029         seq_printf(m, "cache size\t: %d KB(L1 icache) "
1030                 "%d KB(L1 dcache-%s) %d KB(L2 cache)\n",
1031                 icache_size, dcache_size,
1032 #if defined CONFIG_BFIN_WB
1033                 "wb"
1034 #elif defined CONFIG_BFIN_WT
1035                 "wt"
1036 #endif
1037                 "", 0);
1038
1039         seq_printf(m, "%s\n", cache);
1040
1041         if (icache_size)
1042                 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1043                            BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1044         else
1045                 seq_printf(m, "icache setup\t: off\n");
1046
1047         seq_printf(m,
1048                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1049                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1050                    BFIN_DLINES);
1051 #ifdef CONFIG_BFIN_ICACHE_LOCK
1052         switch (read_iloc()) {
1053         case WAY0_L:
1054                 seq_printf(m, "Way0 Locked-Down\n");
1055                 break;
1056         case WAY1_L:
1057                 seq_printf(m, "Way1 Locked-Down\n");
1058                 break;
1059         case WAY01_L:
1060                 seq_printf(m, "Way0,Way1 Locked-Down\n");
1061                 break;
1062         case WAY2_L:
1063                 seq_printf(m, "Way2 Locked-Down\n");
1064                 break;
1065         case WAY02_L:
1066                 seq_printf(m, "Way0,Way2 Locked-Down\n");
1067                 break;
1068         case WAY12_L:
1069                 seq_printf(m, "Way1,Way2 Locked-Down\n");
1070                 break;
1071         case WAY012_L:
1072                 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1073                 break;
1074         case WAY3_L:
1075                 seq_printf(m, "Way3 Locked-Down\n");
1076                 break;
1077         case WAY03_L:
1078                 seq_printf(m, "Way0,Way3 Locked-Down\n");
1079                 break;
1080         case WAY13_L:
1081                 seq_printf(m, "Way1,Way3 Locked-Down\n");
1082                 break;
1083         case WAY013_L:
1084                 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1085                 break;
1086         case WAY32_L:
1087                 seq_printf(m, "Way3,Way2 Locked-Down\n");
1088                 break;
1089         case WAY320_L:
1090                 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1091                 break;
1092         case WAY321_L:
1093                 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1094                 break;
1095         case WAYALL_L:
1096                 seq_printf(m, "All Ways are locked\n");
1097                 break;
1098         default:
1099                 seq_printf(m, "No Ways are locked\n");
1100         }
1101 #endif
1102         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1103         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1104                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1105         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1106                 ((int)memory_end - (int)_stext) >> 10,
1107                 _stext,
1108                 (void *)memory_end);
1109
1110         return 0;
1111 }
1112
1113 static void *c_start(struct seq_file *m, loff_t *pos)
1114 {
1115         return *pos < NR_CPUS ? ((void *)0x12345678) : NULL;
1116 }
1117
1118 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1119 {
1120         ++*pos;
1121         return c_start(m, pos);
1122 }
1123
1124 static void c_stop(struct seq_file *m, void *v)
1125 {
1126 }
1127
1128 const struct seq_operations cpuinfo_op = {
1129         .start = c_start,
1130         .next = c_next,
1131         .stop = c_stop,
1132         .show = show_cpuinfo,
1133 };
1134
1135 void __init cmdline_init(const char *r0)
1136 {
1137         if (r0)
1138                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1139 }