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/mm.h>
  17 #include <linux/module.h>
  18 #include <linux/tty.h>
  19 #include <linux/pfn.h>
  20
  21 #ifdef CONFIG_MTD_UCLINUX
  22 #include <linux/mtd/map.h>
  23 #include <linux/ext2_fs.h>
  24 #include <linux/cramfs_fs.h>
  25 #include <linux/romfs_fs.h>
  26 #endif
  27
  28 #include <asm/cplb.h>
  29 #include <asm/cacheflush.h>
  30 #include <asm/blackfin.h>
  31 #include <asm/cplbinit.h>
  32 #include <asm/div64.h>
  33 #include <asm/cpu.h>
  34 #include <asm/fixed_code.h>
  35 #include <asm/early_printk.h>
  36
  37 u16 _bfin_swrst;
  38 EXPORT_SYMBOL(_bfin_swrst);
  39
  40 unsigned long memory_start, memory_end, physical_mem_end;
  41 unsigned long _rambase, _ramstart, _ramend;
  42 unsigned long reserved_mem_dcache_on;
  43 unsigned long reserved_mem_icache_on;
  44 EXPORT_SYMBOL(memory_start);
  45 EXPORT_SYMBOL(memory_end);
  46 EXPORT_SYMBOL(physical_mem_end);
  47 EXPORT_SYMBOL(_ramend);
  48 EXPORT_SYMBOL(reserved_mem_dcache_on);
  49
  50 #ifdef CONFIG_MTD_UCLINUX
  51 extern struct map_info uclinux_ram_map;
  52 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
  53 unsigned long _ebss;
  54 EXPORT_SYMBOL(memory_mtd_end);
  55 EXPORT_SYMBOL(memory_mtd_start);
  56 EXPORT_SYMBOL(mtd_size);
  57 #endif
  58
  59 char __initdata command_line[COMMAND_LINE_SIZE];
  60 void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
  61         *init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
  62
  63 /* boot memmap, for parsing "memmap=" */
  64 #define BFIN_MEMMAP_MAX         128 /* number of entries in bfin_memmap */
  65 #define BFIN_MEMMAP_RAM         1
  66 #define BFIN_MEMMAP_RESERVED    2
  67 static struct bfin_memmap {
  68         int nr_map;
  69         struct bfin_memmap_entry {
  70                 unsigned long long addr; /* start of memory segment */
  71                 unsigned long long size;
  72                 unsigned long type;
  73         } map[BFIN_MEMMAP_MAX];
  74 } bfin_memmap __initdata;
  75
  76 /* for memmap sanitization */
  77 struct change_member {
  78         struct bfin_memmap_entry *pentry; /* pointer to original entry */
  79         unsigned long long addr; /* address for this change point */
  80 };
  81 static struct change_member change_point_list[2*BFIN_MEMMAP_MAX] __initdata;
  82 static struct change_member *change_point[2*BFIN_MEMMAP_MAX] __initdata;
  83 static struct bfin_memmap_entry *overlap_list[BFIN_MEMMAP_MAX] __initdata;
  84 static struct bfin_memmap_entry new_map[BFIN_MEMMAP_MAX] __initdata;
  85
  86 DEFINE_PER_CPU(struct blackfin_cpudata, cpu_data);
  87
  88 static int early_init_clkin_hz(char *buf);
  89
  90 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  91 void __init generate_cplb_tables(void)
  92 {
  93         unsigned int cpu;
  94
  95         generate_cplb_tables_all();
  96         /* Generate per-CPU I&D CPLB tables */
  97         for (cpu = 0; cpu < num_possible_cpus(); ++cpu)
  98                 generate_cplb_tables_cpu(cpu);
  99 }
 100 #endif
 101
 102 void __cpuinit bfin_setup_caches(unsigned int cpu)
 103 {
 104 #ifdef CONFIG_BFIN_ICACHE
 105         bfin_icache_init(icplb_tbl[cpu]);
 106 #endif
 107
 108 #ifdef CONFIG_BFIN_DCACHE
 109         bfin_dcache_init(dcplb_tbl[cpu]);
 110 #endif
 111
 112         /*
 113          * In cache coherence emulation mode, we need to have the
 114          * D-cache enabled before running any atomic operation which
 115          * might invove cache invalidation (i.e. spinlock, rwlock).
 116          * So printk's are deferred until then.
 117          */
 118 #ifdef CONFIG_BFIN_ICACHE
 119         printk(KERN_INFO "Instruction Cache Enabled for CPU%u\n", cpu);
 120         printk(KERN_INFO "  External memory:"
 121 # ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
 122                " cacheable"
 123 # else
 124                " uncacheable"
 125 # endif
 126                " in instruction cache\n");
 127         if (L2_LENGTH)
 128                 printk(KERN_INFO "  L2 SRAM        :"
 129 # ifdef CONFIG_BFIN_L2_ICACHEABLE
 130                        " cacheable"
 131 # else
 132                        " uncacheable"
 133 # endif
 134                        " in instruction cache\n");
 135
 136 #else
 137         printk(KERN_INFO "Instruction Cache Disabled for CPU%u\n", cpu);
 138 #endif
 139
 140 #ifdef CONFIG_BFIN_DCACHE
 141         printk(KERN_INFO "Data Cache Enabled for CPU%u\n", cpu);
 142         printk(KERN_INFO "  External memory:"
 143 # if defined CONFIG_BFIN_EXTMEM_WRITEBACK
 144                " cacheable (write-back)"
 145 # elif defined CONFIG_BFIN_EXTMEM_WRITETHROUGH
 146                " cacheable (write-through)"
 147 # else
 148                " uncacheable"
 149 # endif
 150                " in data cache\n");
 151         if (L2_LENGTH)
 152                 printk(KERN_INFO "  L2 SRAM        :"
 153 # if defined CONFIG_BFIN_L2_WRITEBACK
 154                        " cacheable (write-back)"
 155 # elif defined CONFIG_BFIN_L2_WRITETHROUGH
 156                        " cacheable (write-through)"
 157 # else
 158                        " uncacheable"
 159 # endif
 160                        " in data cache\n");
 161 #else
 162         printk(KERN_INFO "Data Cache Disabled for CPU%u\n", cpu);
 163 #endif
 164 }
 165
 166 void __cpuinit bfin_setup_cpudata(unsigned int cpu)
 167 {
 168         struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu);
 169
 170         cpudata->idle = current;
 171         cpudata->loops_per_jiffy = loops_per_jiffy;
 172         cpudata->imemctl = bfin_read_IMEM_CONTROL();
 173         cpudata->dmemctl = bfin_read_DMEM_CONTROL();
 174 }
 175
 176 void __init bfin_cache_init(void)
 177 {
 178 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
 179         generate_cplb_tables();
 180 #endif
 181         bfin_setup_caches(0);
 182 }
 183
 184 void __init bfin_relocate_l1_mem(void)
 185 {
 186         unsigned long l1_code_length;
 187         unsigned long l1_data_a_length;
 188         unsigned long l1_data_b_length;
 189         unsigned long l2_length;
 190
 191         /*
 192          * due to the ALIGN(4) in the arch/blackfin/kernel/vmlinux.lds.S
 193          * we know that everything about l1 text/data is nice and aligned,
 194          * so copy by 4 byte chunks, and don't worry about overlapping
 195          * src/dest.
 196          *
 197          * We can't use the dma_memcpy functions, since they can call
 198          * scheduler functions which might be in L1 :( and core writes
 199          * into L1 instruction cause bad access errors, so we are stuck,
 200          * we are required to use DMA, but can't use the common dma
 201          * functions. We can't use memcpy either - since that might be
 202          * going to be in the relocated L1
 203          */
 204
 205         blackfin_dma_early_init();
 206
 207         /* if necessary, copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
 208         l1_code_length = _etext_l1 - _stext_l1;
 209         if (l1_code_length)
 210                 early_dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
 211
 212         /* if necessary, copy _sdata_l1 to _sbss_l1 to L1 data bank A SRAM */
 213         l1_data_a_length = _sbss_l1 - _sdata_l1;
 214         if (l1_data_a_length)
 215                 early_dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
 216
 217         /* if necessary, copy _sdata_b_l1 to _sbss_b_l1 to L1 data bank B SRAM */
 218         l1_data_b_length = _sbss_b_l1 - _sdata_b_l1;
 219         if (l1_data_b_length)
 220                 early_dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
 221                         l1_data_a_length, l1_data_b_length);
 222
 223         early_dma_memcpy_done();
 224
 225         /* if necessary, copy _stext_l2 to _edata_l2 to L2 SRAM */
 226         if (L2_LENGTH != 0) {
 227                 l2_length = _sbss_l2 - _stext_l2;
 228                 if (l2_length)
 229                         memcpy(_stext_l2, _l2_lma_start, l2_length);
 230         }
 231 }
 232
 233 /* add_memory_region to memmap */
 234 static void __init add_memory_region(unsigned long long start,
 235                               unsigned long long size, int type)
 236 {
 237         int i;
 238
 239         i = bfin_memmap.nr_map;
 240
 241         if (i == BFIN_MEMMAP_MAX) {
 242                 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 243                 return;
 244         }
 245
 246         bfin_memmap.map[i].addr = start;
 247         bfin_memmap.map[i].size = size;
 248         bfin_memmap.map[i].type = type;
 249         bfin_memmap.nr_map++;
 250 }
 251
 252 /*
 253  * Sanitize the boot memmap, removing overlaps.
 254  */
 255 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
 256 {
 257         struct change_member *change_tmp;
 258         unsigned long current_type, last_type;
 259         unsigned long long last_addr;
 260         int chgidx, still_changing;
 261         int overlap_entries;
 262         int new_entry;
 263         int old_nr, new_nr, chg_nr;
 264         int i;
 265
 266         /*
 267                 Visually we're performing the following (1,2,3,4 = memory types)
 268
 269                 Sample memory map (w/overlaps):
 270                    ____22__________________
 271                    ______________________4_
 272                    ____1111________________
 273                    _44_____________________
 274                    11111111________________
 275                    ____________________33__
 276                    ___________44___________
 277                    __________33333_________
 278                    ______________22________
 279                    ___________________2222_
 280                    _________111111111______
 281                    _____________________11_
 282                    _________________4______
 283
 284                 Sanitized equivalent (no overlap):
 285                    1_______________________
 286                    _44_____________________
 287                    ___1____________________
 288                    ____22__________________
 289                    ______11________________
 290                    _________1______________
 291                    __________3_____________
 292                    ___________44___________
 293                    _____________33_________
 294                    _______________2________
 295                    ________________1_______
 296                    _________________4______
 297                    ___________________2____
 298                    ____________________33__
 299                    ______________________4_
 300         */
 301         /* if there's only one memory region, don't bother */
 302         if (*pnr_map < 2)
 303                 return -1;
 304
 305         old_nr = *pnr_map;
 306
 307         /* bail out if we find any unreasonable addresses in memmap */
 308         for (i = 0; i < old_nr; i++)
 309                 if (map[i].addr + map[i].size < map[i].addr)
 310                         return -1;
 311
 312         /* create pointers for initial change-point information (for sorting) */
 313         for (i = 0; i < 2*old_nr; i++)
 314                 change_point[i] = &change_point_list[i];
 315
 316         /* record all known change-points (starting and ending addresses),
 317            omitting those that are for empty memory regions */
 318         chgidx = 0;
 319         for (i = 0; i < old_nr; i++) {
 320                 if (map[i].size != 0) {
 321                         change_point[chgidx]->addr = map[i].addr;
 322                         change_point[chgidx++]->pentry = &map[i];
 323                         change_point[chgidx]->addr = map[i].addr + map[i].size;
 324                         change_point[chgidx++]->pentry = &map[i];
 325                 }
 326         }
 327         chg_nr = chgidx;        /* true number of change-points */
 328
 329         /* sort change-point list by memory addresses (low -> high) */
 330         still_changing = 1;
 331         while (still_changing) {
 332                 still_changing = 0;
 333                 for (i = 1; i < chg_nr; i++) {
 334                         /* if <current_addr> > <last_addr>, swap */
 335                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 336                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 337                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 338                                  (change_point[i]->addr == change_point[i]->pentry->addr) &&
 339                                  (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
 340                            ) {
 341                                 change_tmp = change_point[i];
 342                                 change_point[i] = change_point[i-1];
 343                                 change_point[i-1] = change_tmp;
 344                                 still_changing = 1;
 345                         }
 346                 }
 347         }
 348
 349         /* create a new memmap, removing overlaps */
 350         overlap_entries = 0;    /* number of entries in the overlap table */
 351         new_entry = 0;          /* index for creating new memmap entries */
 352         last_type = 0;          /* start with undefined memory type */
 353         last_addr = 0;          /* start with 0 as last starting address */
 354         /* loop through change-points, determining affect on the new memmap */
 355         for (chgidx = 0; chgidx < chg_nr; chgidx++) {
 356                 /* keep track of all overlapping memmap entries */
 357                 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
 358                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 359                         overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
 360                 } else {
 361                         /* remove entry from list (order independent, so swap with last) */
 362                         for (i = 0; i < overlap_entries; i++) {
 363                                 if (overlap_list[i] == change_point[chgidx]->pentry)
 364                                         overlap_list[i] = overlap_list[overlap_entries-1];
 365                         }
 366                         overlap_entries--;
 367                 }
 368                 /* if there are overlapping entries, decide which "type" to use */
 369                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 370                 current_type = 0;
 371                 for (i = 0; i < overlap_entries; i++)
 372                         if (overlap_list[i]->type > current_type)
 373                                 current_type = overlap_list[i]->type;
 374                 /* continue building up new memmap based on this information */
 375                 if (current_type != last_type) {
 376                         if (last_type != 0) {
 377                                 new_map[new_entry].size =
 378                                         change_point[chgidx]->addr - last_addr;
 379                                 /* move forward only if the new size was non-zero */
 380                                 if (new_map[new_entry].size != 0)
 381                                         if (++new_entry >= BFIN_MEMMAP_MAX)
 382                                                 break;  /* no more space left for new entries */
 383                         }
 384                         if (current_type != 0) {
 385                                 new_map[new_entry].addr = change_point[chgidx]->addr;
 386                                 new_map[new_entry].type = current_type;
 387                                 last_addr = change_point[chgidx]->addr;
 388                         }
 389                         last_type = current_type;
 390                 }
 391         }
 392         new_nr = new_entry;     /* retain count for new entries */
 393
 394         /* copy new mapping into original location */
 395         memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
 396         *pnr_map = new_nr;
 397
 398         return 0;
 399 }
 400
 401 static void __init print_memory_map(char *who)
 402 {
 403         int i;
 404
 405         for (i = 0; i < bfin_memmap.nr_map; i++) {
 406                 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
 407                         bfin_memmap.map[i].addr,
 408                         bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
 409                 switch (bfin_memmap.map[i].type) {
 410                 case BFIN_MEMMAP_RAM:
 411                                 printk("(usable)\n");
 412                                 break;
 413                 case BFIN_MEMMAP_RESERVED:
 414                                 printk("(reserved)\n");
 415                                 break;
 416                 default:        printk("type %lu\n", bfin_memmap.map[i].type);
 417                                 break;
 418                 }
 419         }
 420 }
 421
 422 static __init int parse_memmap(char *arg)
 423 {
 424         unsigned long long start_at, mem_size;
 425
 426         if (!arg)
 427                 return -EINVAL;
 428
 429         mem_size = memparse(arg, &arg);
 430         if (*arg == '@') {
 431                 start_at = memparse(arg+1, &arg);
 432                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 433         } else if (*arg == '$') {
 434                 start_at = memparse(arg+1, &arg);
 435                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 436         }
 437
 438         return 0;
 439 }
 440
 441 /*
 442  * Initial parsing of the command line.  Currently, we support:
 443  *  - Controlling the linux memory size: mem=xxx[KMG]
 444  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 445  *       $ -> reserved memory is dcacheable
 446  *       # -> reserved memory is icacheable
 447  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 448  *       @ from <start> to <start>+<mem>, type RAM
 449  *       $ from <start> to <start>+<mem>, type RESERVED
 450  */
 451 static __init void parse_cmdline_early(char *cmdline_p)
 452 {
 453         char c = ' ', *to = cmdline_p;
 454         unsigned int memsize;
 455         for (;;) {
 456                 if (c == ' ') {
 457                         if (!memcmp(to, "mem=", 4)) {
 458                                 to += 4;
 459                                 memsize = memparse(to, &to);
 460                                 if (memsize)
 461                                         _ramend = memsize;
 462
 463                         } else if (!memcmp(to, "max_mem=", 8)) {
 464                                 to += 8;
 465                                 memsize = memparse(to, &to);
 466                                 if (memsize) {
 467                                         physical_mem_end = memsize;
 468                                         if (*to != ' ') {
 469                                                 if (*to == '$'
 470                                                     || *(to + 1) == '$')
 471                                                         reserved_mem_dcache_on = 1;
 472                                                 if (*to == '#'
 473                                                     || *(to + 1) == '#')
 474                                                         reserved_mem_icache_on = 1;
 475                                         }
 476                                 }
 477                         } else if (!memcmp(to, "clkin_hz=", 9)) {
 478                                 to += 9;
 479                                 early_init_clkin_hz(to);
 480 #ifdef CONFIG_EARLY_PRINTK
 481                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 482                                 to += 12;
 483                                 setup_early_printk(to);
 484 #endif
 485                         } else if (!memcmp(to, "memmap=", 7)) {
 486                                 to += 7;
 487                                 parse_memmap(to);
 488                         }
 489                 }
 490                 c = *(to++);
 491                 if (!c)
 492                         break;
 493         }
 494 }
 495
 496 /*
 497  * Setup memory defaults from user config.
 498  * The physical memory layout looks like:
 499  *
 500  *  [_rambase, _ramstart]:              kernel image
 501  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 502  *  [memory_end, _ramend]:              reserved memory
 503  *      [memory_mtd_start(memory_end),
 504  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 505  *      [_ramend - DMA_UNCACHED_REGION,
 506  *              _ramend]:                       uncached DMA region
 507  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 508  */
 509 static __init void memory_setup(void)
 510 {
 511 #ifdef CONFIG_MTD_UCLINUX
 512         unsigned long mtd_phys = 0;
 513 #endif
 514
 515         _rambase = (unsigned long)_stext;
 516         _ramstart = (unsigned long)_end;
 517
 518         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 519                 console_init();
 520                 panic("DMA region exceeds memory limit: %lu.",
 521                         _ramend - _ramstart);
 522         }
 523         memory_end = _ramend - DMA_UNCACHED_REGION;
 524
 525 #ifdef CONFIG_MPU
 526         /* Round up to multiple of 4MB */
 527         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 528 #else
 529         memory_start = PAGE_ALIGN(_ramstart);
 530 #endif
 531
 532 #if defined(CONFIG_MTD_UCLINUX)
 533         /* generic memory mapped MTD driver */
 534         memory_mtd_end = memory_end;
 535
 536         mtd_phys = _ramstart;
 537         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 538
 539 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 540         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 541                 mtd_size =
 542                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 543 # endif
 544
 545 # if defined(CONFIG_CRAMFS)
 546         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 547                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 548 # endif
 549
 550 # if defined(CONFIG_ROMFS_FS)
 551         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 552             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 553                 mtd_size =
 554                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 555 #  if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 556         /* Due to a Hardware Anomaly we need to limit the size of usable
 557          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 558          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 559          */
 560 #   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 561         if (memory_end >= 56 * 1024 * 1024)
 562                 memory_end = 56 * 1024 * 1024;
 563 #   else
 564         if (memory_end >= 60 * 1024 * 1024)
 565                 memory_end = 60 * 1024 * 1024;
 566 #   endif                               /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 567 #  endif                                /* ANOMALY_05000263 */
 568 # endif                         /* CONFIG_ROMFS_FS */
 569
 570         memory_end -= mtd_size;
 571
 572         if (mtd_size == 0) {
 573                 console_init();
 574                 panic("Don't boot kernel without rootfs attached.");
 575         }
 576
 577         /* Relocate MTD image to the top of memory after the uncached memory area */
 578         uclinux_ram_map.phys = memory_mtd_start = memory_end;
 579         uclinux_ram_map.size = mtd_size;
 580         dma_memcpy((void *)uclinux_ram_map.phys, _end, uclinux_ram_map.size);
 581 #endif                          /* CONFIG_MTD_UCLINUX */
 582
 583 #if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 584         /* Due to a Hardware Anomaly we need to limit the size of usable
 585          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 586          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 587          */
 588 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 589         if (memory_end >= 56 * 1024 * 1024)
 590                 memory_end = 56 * 1024 * 1024;
 591 #else
 592         if (memory_end >= 60 * 1024 * 1024)
 593                 memory_end = 60 * 1024 * 1024;
 594 #endif                          /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 595         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 596 #endif                          /* ANOMALY_05000263 */
 597
 598 #ifdef CONFIG_MPU
 599         page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
 600         page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
 601 #endif
 602
 603 #if !defined(CONFIG_MTD_UCLINUX)
 604         /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 605         memory_end -= SIZE_4K;
 606 #endif
 607
 608         init_mm.start_code = (unsigned long)_stext;
 609         init_mm.end_code = (unsigned long)_etext;
 610         init_mm.end_data = (unsigned long)_edata;
 611         init_mm.brk = (unsigned long)0;
 612
 613         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 614         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 615
 616         printk(KERN_INFO "Memory map:\n"
 617                 KERN_INFO "  fixedcode = 0x%p-0x%p\n"
 618                 KERN_INFO "  text      = 0x%p-0x%p\n"
 619                 KERN_INFO "  rodata    = 0x%p-0x%p\n"
 620                 KERN_INFO "  bss       = 0x%p-0x%p\n"
 621                 KERN_INFO "  data      = 0x%p-0x%p\n"
 622                 KERN_INFO "    stack   = 0x%p-0x%p\n"
 623                 KERN_INFO "  init      = 0x%p-0x%p\n"
 624                 KERN_INFO "  available = 0x%p-0x%p\n"
 625 #ifdef CONFIG_MTD_UCLINUX
 626                 KERN_INFO "  rootfs    = 0x%p-0x%p\n"
 627 #endif
 628 #if DMA_UNCACHED_REGION > 0
 629                 KERN_INFO "  DMA Zone  = 0x%p-0x%p\n"
 630 #endif
 631                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 632                 _stext, _etext,
 633                 __start_rodata, __end_rodata,
 634                 __bss_start, __bss_stop,
 635                 _sdata, _edata,
 636                 (void *)&init_thread_union,
 637                 (void *)((int)(&init_thread_union) + 0x2000),
 638                 __init_begin, __init_end,
 639                 (void *)_ramstart, (void *)memory_end
 640 #ifdef CONFIG_MTD_UCLINUX
 641                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 642 #endif
 643 #if DMA_UNCACHED_REGION > 0
 644                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 645 #endif
 646                 );
 647 }
 648
 649 /*
 650  * Find the lowest, highest page frame number we have available
 651  */
 652 void __init find_min_max_pfn(void)
 653 {
 654         int i;
 655
 656         max_pfn = 0;
 657         min_low_pfn = memory_end;
 658
 659         for (i = 0; i < bfin_memmap.nr_map; i++) {
 660                 unsigned long start, end;
 661                 /* RAM? */
 662                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 663                         continue;
 664                 start = PFN_UP(bfin_memmap.map[i].addr);
 665                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 666                                 bfin_memmap.map[i].size);
 667                 if (start >= end)
 668                         continue;
 669                 if (end > max_pfn)
 670                         max_pfn = end;
 671                 if (start < min_low_pfn)
 672                         min_low_pfn = start;
 673         }
 674 }
 675
 676 static __init void setup_bootmem_allocator(void)
 677 {
 678         int bootmap_size;
 679         int i;
 680         unsigned long start_pfn, end_pfn;
 681         unsigned long curr_pfn, last_pfn, size;
 682
 683         /* mark memory between memory_start and memory_end usable */
 684         add_memory_region(memory_start,
 685                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 686         /* sanity check for overlap */
 687         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 688         print_memory_map("boot memmap");
 689
 690         /* intialize globals in linux/bootmem.h */
 691         find_min_max_pfn();
 692         /* pfn of the last usable page frame */
 693         if (max_pfn > memory_end >> PAGE_SHIFT)
 694                 max_pfn = memory_end >> PAGE_SHIFT;
 695         /* pfn of last page frame directly mapped by kernel */
 696         max_low_pfn = max_pfn;
 697         /* pfn of the first usable page frame after kernel image*/
 698         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 699                 min_low_pfn = memory_start >> PAGE_SHIFT;
 700
 701         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 702         end_pfn = memory_end >> PAGE_SHIFT;
 703
 704         /*
 705          * give all the memory to the bootmap allocator, tell it to put the
 706          * boot mem_map at the start of memory.
 707          */
 708         bootmap_size = init_bootmem_node(NODE_DATA(0),
 709                         memory_start >> PAGE_SHIFT,     /* map goes here */
 710                         start_pfn, end_pfn);
 711
 712         /* register the memmap regions with the bootmem allocator */
 713         for (i = 0; i < bfin_memmap.nr_map; i++) {
 714                 /*
 715                  * Reserve usable memory
 716                  */
 717                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 718                         continue;
 719                 /*
 720                  * We are rounding up the start address of usable memory:
 721                  */
 722                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 723                 if (curr_pfn >= end_pfn)
 724                         continue;
 725                 /*
 726                  * ... and at the end of the usable range downwards:
 727                  */
 728                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 729                                          bfin_memmap.map[i].size);
 730
 731                 if (last_pfn > end_pfn)
 732                         last_pfn = end_pfn;
 733
 734                 /*
 735                  * .. finally, did all the rounding and playing
 736                  * around just make the area go away?
 737                  */
 738                 if (last_pfn <= curr_pfn)
 739                         continue;
 740
 741                 size = last_pfn - curr_pfn;
 742                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 743         }
 744
 745         /* reserve memory before memory_start, including bootmap */
 746         reserve_bootmem(PAGE_OFFSET,
 747                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 748                 BOOTMEM_DEFAULT);
 749 }
 750
 751 #define EBSZ_TO_MEG(ebsz) \
 752 ({ \
 753         int meg = 0; \
 754         switch (ebsz & 0xf) { \
 755                 case 0x1: meg =  16; break; \
 756                 case 0x3: meg =  32; break; \
 757                 case 0x5: meg =  64; break; \
 758                 case 0x7: meg = 128; break; \
 759                 case 0x9: meg = 256; break; \
 760                 case 0xb: meg = 512; break; \
 761         } \
 762         meg; \
 763 })
 764 static inline int __init get_mem_size(void)
 765 {
 766 #if defined(EBIU_SDBCTL)
 767 # if defined(BF561_FAMILY)
 768         int ret = 0;
 769         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 770         ret += EBSZ_TO_MEG(sdbctl >>  0);
 771         ret += EBSZ_TO_MEG(sdbctl >>  8);
 772         ret += EBSZ_TO_MEG(sdbctl >> 16);
 773         ret += EBSZ_TO_MEG(sdbctl >> 24);
 774         return ret;
 775 # else
 776         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 777 # endif
 778 #elif defined(EBIU_DDRCTL1)
 779         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 780         int ret = 0;
 781         switch (ddrctl & 0xc0000) {
 782                 case DEVSZ_64:  ret = 64 / 8;
 783                 case DEVSZ_128: ret = 128 / 8;
 784                 case DEVSZ_256: ret = 256 / 8;
 785                 case DEVSZ_512: ret = 512 / 8;
 786         }
 787         switch (ddrctl & 0x30000) {
 788                 case DEVWD_4:  ret *= 2;
 789                 case DEVWD_8:  ret *= 2;
 790                 case DEVWD_16: break;
 791         }
 792         if ((ddrctl & 0xc000) == 0x4000)
 793                 ret *= 2;
 794         return ret;
 795 #endif
 796         BUG();
 797 }
 798
 799 void __init setup_arch(char **cmdline_p)
 800 {
 801         unsigned long sclk, cclk;
 802
 803         /* Check to make sure we are running on the right processor */
 804         if (unlikely(CPUID != bfin_cpuid()))
 805                 printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
 806                         CPU, bfin_cpuid(), bfin_revid());
 807
 808 #ifdef CONFIG_DUMMY_CONSOLE
 809         conswitchp = &dummy_con;
 810 #endif
 811
 812 #if defined(CONFIG_CMDLINE_BOOL)
 813         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 814         command_line[sizeof(command_line) - 1] = 0;
 815 #endif
 816
 817         /* Keep a copy of command line */
 818         *cmdline_p = &command_line[0];
 819         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 820         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 821
 822         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 823
 824         /* If the user does not specify things on the command line, use
 825          * what the bootloader set things up as
 826          */
 827         physical_mem_end = 0;
 828         parse_cmdline_early(&command_line[0]);
 829
 830         if (_ramend == 0)
 831                 _ramend = get_mem_size() * 1024 * 1024;
 832
 833         if (physical_mem_end == 0)
 834                 physical_mem_end = _ramend;
 835
 836         memory_setup();
 837
 838         /* Initialize Async memory banks */
 839         bfin_write_EBIU_AMBCTL0(AMBCTL0VAL);
 840         bfin_write_EBIU_AMBCTL1(AMBCTL1VAL);
 841         bfin_write_EBIU_AMGCTL(AMGCTLVAL);
 842 #ifdef CONFIG_EBIU_MBSCTLVAL
 843         bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL);
 844         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
 845         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 846 #endif
 847
 848         cclk = get_cclk();
 849         sclk = get_sclk();
 850
 851         if ((ANOMALY_05000273 || ANOMALY_05000274) && (cclk >> 1) < sclk)
 852                 panic("ANOMALY 05000273 or 05000274: CCLK must be >= 2*SCLK");
 853
 854 #ifdef BF561_FAMILY
 855         if (ANOMALY_05000266) {
 856                 bfin_read_IMDMA_D0_IRQ_STATUS();
 857                 bfin_read_IMDMA_D1_IRQ_STATUS();
 858         }
 859 #endif
 860         printk(KERN_INFO "Hardware Trace ");
 861         if (bfin_read_TBUFCTL() & 0x1)
 862                 printk("Active ");
 863         else
 864                 printk("Off ");
 865         if (bfin_read_TBUFCTL() & 0x2)
 866                 printk("and Enabled\n");
 867         else
 868         printk("and Disabled\n");
 869
 870 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
 871         /* we need to initialize the Flashrom device here since we might
 872          * do things with flash early on in the boot
 873          */
 874         flash_probe();
 875 #endif
 876
 877         printk(KERN_INFO "Boot Mode: %i\n", bfin_read_SYSCR() & 0xF);
 878
 879         /* Newer parts mirror SWRST bits in SYSCR */
 880 #if defined(CONFIG_BF53x) || defined(CONFIG_BF561) || \
 881     defined(CONFIG_BF538) || defined(CONFIG_BF539)
 882         _bfin_swrst = bfin_read_SWRST();
 883 #else
 884         /* Clear boot mode field */
 885         _bfin_swrst = bfin_read_SYSCR() & ~0xf;
 886 #endif
 887
 888 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 889         bfin_write_SWRST(_bfin_swrst & ~DOUBLE_FAULT);
 890 #endif
 891 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
 892         bfin_write_SWRST(_bfin_swrst | DOUBLE_FAULT);
 893 #endif
 894
 895 #ifdef CONFIG_SMP
 896         if (_bfin_swrst & SWRST_DBL_FAULT_A) {
 897 #else
 898         if (_bfin_swrst & RESET_DOUBLE) {
 899 #endif
 900                 printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
 901 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 902                 /* We assume the crashing kernel, and the current symbol table match */
 903                 printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
 904                         (int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
 905                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
 906                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
 907 #endif
 908                 printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
 909                         init_retx);
 910         } else if (_bfin_swrst & RESET_WDOG)
 911                 printk(KERN_INFO "Recovering from Watchdog event\n");
 912         else if (_bfin_swrst & RESET_SOFTWARE)
 913                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 914
 915         printk(KERN_INFO "Blackfin support (C) 2004-2009 Analog Devices, Inc.\n");
 916         if (bfin_compiled_revid() == 0xffff)
 917                 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
 918         else if (bfin_compiled_revid() == -1)
 919                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 920         else
 921                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 922
 923         if (likely(CPUID == bfin_cpuid())) {
 924                 if (bfin_revid() != bfin_compiled_revid()) {
 925                         if (bfin_compiled_revid() == -1)
 926                                 printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 927                                        bfin_revid());
 928                         else if (bfin_compiled_revid() != 0xffff) {
 929                                 printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 930                                        bfin_compiled_revid(), bfin_revid());
 931                                 if (bfin_compiled_revid() > bfin_revid())
 932                                         panic("Error: you are missing anomaly workarounds for this rev");
 933                         }
 934                 }
 935                 if (bfin_revid() < CONFIG_BF_REV_MIN || bfin_revid() > CONFIG_BF_REV_MAX)
 936                         printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 937                                CPU, bfin_revid());
 938         }
 939
 940         /* We can't run on BF548-0.1 due to ANOMALY 05000448 */
 941         if (bfin_cpuid() == 0x27de && bfin_revid() == 1)
 942                 panic("You can't run on this processor due to 05000448");
 943
 944         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 945
 946         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 947                cclk / 1000000, sclk / 1000000);
 948
 949         setup_bootmem_allocator();
 950
 951         paging_init();
 952
 953         /* Copy atomic sequences to their fixed location, and sanity check that
 954            these locations are the ones that we advertise to userspace.  */
 955         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 956                FIXED_CODE_END - FIXED_CODE_START);
 957         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 958                != SIGRETURN_STUB - FIXED_CODE_START);
 959         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 960                != ATOMIC_XCHG32 - FIXED_CODE_START);
 961         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 962                != ATOMIC_CAS32 - FIXED_CODE_START);
 963         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 964                != ATOMIC_ADD32 - FIXED_CODE_START);
 965         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 966                != ATOMIC_SUB32 - FIXED_CODE_START);
 967         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 968                != ATOMIC_IOR32 - FIXED_CODE_START);
 969         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 970                != ATOMIC_AND32 - FIXED_CODE_START);
 971         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 972                != ATOMIC_XOR32 - FIXED_CODE_START);
 973         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 974                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 975
 976 #ifdef CONFIG_SMP
 977         platform_init_cpus();
 978 #endif
 979         init_exception_vectors();
 980         bfin_cache_init();      /* Initialize caches for the boot CPU */
 981 }
 982
 983 static int __init topology_init(void)
 984 {
 985         unsigned int cpu;
 986         /* Record CPU-private information for the boot processor. */
 987         bfin_setup_cpudata(0);
 988
 989         for_each_possible_cpu(cpu) {
 990                 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
 991         }
 992
 993         return 0;
 994 }
 995
 996 subsys_initcall(topology_init);
 997
 998 /* Get the input clock frequency */
 999 static u_long cached_clkin_hz = CONFIG_CLKIN_HZ;
1000 static u_long get_clkin_hz(void)
1001 {
1002         return cached_clkin_hz;
1003 }
1004 static int __init early_init_clkin_hz(char *buf)
1005 {
1006         cached_clkin_hz = simple_strtoul(buf, NULL, 0);
1007 #ifdef BFIN_KERNEL_CLOCK
1008         if (cached_clkin_hz != CONFIG_CLKIN_HZ)
1009                 panic("cannot change clkin_hz when reprogramming clocks");
1010 #endif
1011         return 1;
1012 }
1013 early_param("clkin_hz=", early_init_clkin_hz);
1014
1015 /* Get the voltage input multiplier */
1016 static u_long get_vco(void)
1017 {
1018         static u_long cached_vco;
1019         u_long msel, pll_ctl;
1020
1021         /* The assumption here is that VCO never changes at runtime.
1022          * If, someday, we support that, then we'll have to change this.
1023          */
1024         if (cached_vco)
1025                 return cached_vco;
1026
1027         pll_ctl = bfin_read_PLL_CTL();
1028         msel = (pll_ctl >> 9) & 0x3F;
1029         if (0 == msel)
1030                 msel = 64;
1031
1032         cached_vco = get_clkin_hz();
1033         cached_vco >>= (1 & pll_ctl);   /* DF bit */
1034         cached_vco *= msel;
1035         return cached_vco;
1036 }
1037
1038 /* Get the Core clock */
1039 u_long get_cclk(void)
1040 {
1041         static u_long cached_cclk_pll_div, cached_cclk;
1042         u_long csel, ssel;
1043
1044         if (bfin_read_PLL_STAT() & 0x1)
1045                 return get_clkin_hz();
1046
1047         ssel = bfin_read_PLL_DIV();
1048         if (ssel == cached_cclk_pll_div)
1049                 return cached_cclk;
1050         else
1051                 cached_cclk_pll_div = ssel;
1052
1053         csel = ((ssel >> 4) & 0x03);
1054         ssel &= 0xf;
1055         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
1056                 cached_cclk = get_vco() / ssel;
1057         else
1058                 cached_cclk = get_vco() >> csel;
1059         return cached_cclk;
1060 }
1061 EXPORT_SYMBOL(get_cclk);
1062
1063 /* Get the System clock */
1064 u_long get_sclk(void)
1065 {
1066         static u_long cached_sclk;
1067         u_long ssel;
1068
1069         /* The assumption here is that SCLK never changes at runtime.
1070          * If, someday, we support that, then we'll have to change this.
1071          */
1072         if (cached_sclk)
1073                 return cached_sclk;
1074
1075         if (bfin_read_PLL_STAT() & 0x1)
1076                 return get_clkin_hz();
1077
1078         ssel = bfin_read_PLL_DIV() & 0xf;
1079         if (0 == ssel) {
1080                 printk(KERN_WARNING "Invalid System Clock\n");
1081                 ssel = 1;
1082         }
1083
1084         cached_sclk = get_vco() / ssel;
1085         return cached_sclk;
1086 }
1087 EXPORT_SYMBOL(get_sclk);
1088
1089 unsigned long sclk_to_usecs(unsigned long sclk)
1090 {
1091         u64 tmp = USEC_PER_SEC * (u64)sclk;
1092         do_div(tmp, get_sclk());
1093         return tmp;
1094 }
1095 EXPORT_SYMBOL(sclk_to_usecs);
1096
1097 unsigned long usecs_to_sclk(unsigned long usecs)
1098 {
1099         u64 tmp = get_sclk() * (u64)usecs;
1100         do_div(tmp, USEC_PER_SEC);
1101         return tmp;
1102 }
1103 EXPORT_SYMBOL(usecs_to_sclk);
1104
1105 /*
1106  *      Get CPU information for use by the procfs.
1107  */
1108 static int show_cpuinfo(struct seq_file *m, void *v)
1109 {
1110         char *cpu, *mmu, *fpu, *vendor, *cache;
1111         uint32_t revid;
1112         int cpu_num = *(unsigned int *)v;
1113         u_long sclk, cclk;
1114         u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
1115         struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu_num);
1116
1117         cpu = CPU;
1118         mmu = "none";
1119         fpu = "none";
1120         revid = bfin_revid();
1121
1122         sclk = get_sclk();
1123         cclk = get_cclk();
1124
1125         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
1126         case 0xca:
1127                 vendor = "Analog Devices";
1128                 break;
1129         default:
1130                 vendor = "unknown";
1131                 break;
1132         }
1133
1134         seq_printf(m, "processor\t: %d\n" "vendor_id\t: %s\n", cpu_num, vendor);
1135
1136         if (CPUID == bfin_cpuid())
1137                 seq_printf(m, "cpu family\t: 0x%04x\n", CPUID);
1138         else
1139                 seq_printf(m, "cpu family\t: Compiled for:0x%04x, running on:0x%04x\n",
1140                         CPUID, bfin_cpuid());
1141
1142         seq_printf(m, "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1143                 "stepping\t: %d ",
1144                 cpu, cclk/1000000, sclk/1000000,
1145 #ifdef CONFIG_MPU
1146                 "mpu on",
1147 #else
1148                 "mpu off",
1149 #endif
1150                 revid);
1151
1152         if (bfin_revid() != bfin_compiled_revid()) {
1153                 if (bfin_compiled_revid() == -1)
1154                         seq_printf(m, "(Compiled for Rev none)");
1155                 else if (bfin_compiled_revid() == 0xffff)
1156                         seq_printf(m, "(Compiled for Rev any)");
1157                 else
1158                         seq_printf(m, "(Compiled for Rev %d)", bfin_compiled_revid());
1159         }
1160
1161         seq_printf(m, "\ncpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1162                 cclk/1000000, cclk%1000000,
1163                 sclk/1000000, sclk%1000000);
1164         seq_printf(m, "bogomips\t: %lu.%02lu\n"
1165                 "Calibration\t: %lu loops\n",
1166                 (cpudata->loops_per_jiffy * HZ) / 500000,
1167                 ((cpudata->loops_per_jiffy * HZ) / 5000) % 100,
1168                 (cpudata->loops_per_jiffy * HZ));
1169
1170         /* Check Cache configutation */
1171         switch (cpudata->dmemctl & (1 << DMC0_P | 1 << DMC1_P)) {
1172         case ACACHE_BSRAM:
1173                 cache = "dbank-A/B\t: cache/sram";
1174                 dcache_size = 16;
1175                 dsup_banks = 1;
1176                 break;
1177         case ACACHE_BCACHE:
1178                 cache = "dbank-A/B\t: cache/cache";
1179                 dcache_size = 32;
1180                 dsup_banks = 2;
1181                 break;
1182         case ASRAM_BSRAM:
1183                 cache = "dbank-A/B\t: sram/sram";
1184                 dcache_size = 0;
1185                 dsup_banks = 0;
1186                 break;
1187         default:
1188                 cache = "unknown";
1189                 dcache_size = 0;
1190                 dsup_banks = 0;
1191                 break;
1192         }
1193
1194         /* Is it turned on? */
1195         if ((cpudata->dmemctl & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1196                 dcache_size = 0;
1197
1198         if ((cpudata->imemctl & (IMC | ENICPLB)) != (IMC | ENICPLB))
1199                 icache_size = 0;
1200
1201         seq_printf(m, "cache size\t: %d KB(L1 icache) "
1202                 "%d KB(L1 dcache) %d KB(L2 cache)\n",
1203                 icache_size, dcache_size, 0);
1204         seq_printf(m, "%s\n", cache);
1205         seq_printf(m, "external memory\t: "
1206 #if defined(CONFIG_BFIN_EXTMEM_ICACHEABLE)
1207                    "cacheable"
1208 #else
1209                    "uncacheable"
1210 #endif
1211                    " in instruction cache\n");
1212         seq_printf(m, "external memory\t: "
1213 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK)
1214                       "cacheable (write-back)"
1215 #elif defined(CONFIG_BFIN_EXTMEM_WRITETHROUGH)
1216                       "cacheable (write-through)"
1217 #else
1218                       "uncacheable"
1219 #endif
1220                       " in data cache\n");
1221
1222         if (icache_size)
1223                 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1224                            BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1225         else
1226                 seq_printf(m, "icache setup\t: off\n");
1227
1228         seq_printf(m,
1229                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1230                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1231                    BFIN_DLINES);
1232 #ifdef __ARCH_SYNC_CORE_DCACHE
1233         seq_printf(m, "SMP Dcache Flushes\t: %lu\n\n", cpudata->dcache_invld_count);
1234 #endif
1235 #ifdef __ARCH_SYNC_CORE_ICACHE
1236         seq_printf(m, "SMP Icache Flushes\t: %lu\n\n", cpudata->icache_invld_count);
1237 #endif
1238 #ifdef CONFIG_BFIN_ICACHE_LOCK
1239         switch ((cpudata->imemctl >> 3) & WAYALL_L) {
1240         case WAY0_L:
1241                 seq_printf(m, "Way0 Locked-Down\n");
1242                 break;
1243         case WAY1_L:
1244                 seq_printf(m, "Way1 Locked-Down\n");
1245                 break;
1246         case WAY01_L:
1247                 seq_printf(m, "Way0,Way1 Locked-Down\n");
1248                 break;
1249         case WAY2_L:
1250                 seq_printf(m, "Way2 Locked-Down\n");
1251                 break;
1252         case WAY02_L:
1253                 seq_printf(m, "Way0,Way2 Locked-Down\n");
1254                 break;
1255         case WAY12_L:
1256                 seq_printf(m, "Way1,Way2 Locked-Down\n");
1257                 break;
1258         case WAY012_L:
1259                 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1260                 break;
1261         case WAY3_L:
1262                 seq_printf(m, "Way3 Locked-Down\n");
1263                 break;
1264         case WAY03_L:
1265                 seq_printf(m, "Way0,Way3 Locked-Down\n");
1266                 break;
1267         case WAY13_L:
1268                 seq_printf(m, "Way1,Way3 Locked-Down\n");
1269                 break;
1270         case WAY013_L:
1271                 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1272                 break;
1273         case WAY32_L:
1274                 seq_printf(m, "Way3,Way2 Locked-Down\n");
1275                 break;
1276         case WAY320_L:
1277                 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1278                 break;
1279         case WAY321_L:
1280                 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1281                 break;
1282         case WAYALL_L:
1283                 seq_printf(m, "All Ways are locked\n");
1284                 break;
1285         default:
1286                 seq_printf(m, "No Ways are locked\n");
1287         }
1288 #endif
1289
1290         if (cpu_num != num_possible_cpus() - 1)
1291                 return 0;
1292
1293         if (L2_LENGTH) {
1294                 seq_printf(m, "L2 SRAM\t\t: %dKB\n", L2_LENGTH/0x400);
1295                 seq_printf(m, "L2 SRAM\t\t: "
1296 #if defined(CONFIG_BFIN_L2_ICACHEABLE)
1297                               "cacheable"
1298 #else
1299                               "uncacheable"
1300 #endif
1301                               " in instruction cache\n");
1302                 seq_printf(m, "L2 SRAM\t\t: "
1303 #if defined(CONFIG_BFIN_L2_WRITEBACK)
1304                               "cacheable (write-back)"
1305 #elif defined(CONFIG_BFIN_L2_WRITETHROUGH)
1306                               "cacheable (write-through)"
1307 #else
1308                               "uncacheable"
1309 #endif
1310                               " in data cache\n");
1311         }
1312         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1313         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1314                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1315         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1316                 ((int)memory_end - (int)_stext) >> 10,
1317                 _stext,
1318                 (void *)memory_end);
1319         seq_printf(m, "\n");
1320
1321         return 0;
1322 }
1323
1324 static void *c_start(struct seq_file *m, loff_t *pos)
1325 {
1326         if (*pos == 0)
1327                 *pos = first_cpu(cpu_online_map);
1328         if (*pos >= num_online_cpus())
1329                 return NULL;
1330
1331         return pos;
1332 }
1333
1334 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1335 {
1336         *pos = next_cpu(*pos, cpu_online_map);
1337
1338         return c_start(m, pos);
1339 }
1340
1341 static void c_stop(struct seq_file *m, void *v)
1342 {
1343 }
1344
1345 const struct seq_operations cpuinfo_op = {
1346         .start = c_start,
1347         .next = c_next,
1348         .stop = c_stop,
1349         .show = show_cpuinfo,
1350 };
1351
1352 void __init cmdline_init(const char *r0)
1353 {
1354         if (r0)
1355                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1356 }