arch/blackfin/kernel/setup.c

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/console.h>
   9 #include <linux/bootmem.h>
  10 #include <linux/seq_file.h>
  11 #include <linux/cpu.h>
  12 #include <linux/mm.h>
  13 #include <linux/module.h>
  14 #include <linux/tty.h>
  15 #include <linux/pfn.h>
  16
  17 #ifdef CONFIG_MTD_UCLINUX
  18 #include <linux/mtd/map.h>
  19 #include <linux/ext2_fs.h>
  20 #include <linux/cramfs_fs.h>
  21 #include <linux/romfs_fs.h>
  22 #endif
  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/cpu.h>
  30 #include <asm/fixed_code.h>
  31 #include <asm/early_printk.h>
  32
  33 u16 _bfin_swrst;
  34 EXPORT_SYMBOL(_bfin_swrst);
  35
  36 unsigned long memory_start, memory_end, physical_mem_end;
  37 unsigned long _rambase, _ramstart, _ramend;
  38 unsigned long reserved_mem_dcache_on;
  39 unsigned long reserved_mem_icache_on;
  40 EXPORT_SYMBOL(memory_start);
  41 EXPORT_SYMBOL(memory_end);
  42 EXPORT_SYMBOL(physical_mem_end);
  43 EXPORT_SYMBOL(_ramend);
  44 EXPORT_SYMBOL(reserved_mem_dcache_on);
  45
  46 #ifdef CONFIG_MTD_UCLINUX
  47 extern struct map_info uclinux_ram_map;
  48 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
  49 unsigned long _ebss;
  50 EXPORT_SYMBOL(memory_mtd_end);
  51 EXPORT_SYMBOL(memory_mtd_start);
  52 EXPORT_SYMBOL(mtd_size);
  53 #endif
  54
  55 char __initdata command_line[COMMAND_LINE_SIZE];
  56 void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
  57         *init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
  58
  59 /* boot memmap, for parsing "memmap=" */
  60 #define BFIN_MEMMAP_MAX         128 /* number of entries in bfin_memmap */
  61 #define BFIN_MEMMAP_RAM         1
  62 #define BFIN_MEMMAP_RESERVED    2
  63 static struct bfin_memmap {
  64         int nr_map;
  65         struct bfin_memmap_entry {
  66                 unsigned long long addr; /* start of memory segment */
  67                 unsigned long long size;
  68                 unsigned long type;
  69         } map[BFIN_MEMMAP_MAX];
  70 } bfin_memmap __initdata;
  71
  72 /* for memmap sanitization */
  73 struct change_member {
  74         struct bfin_memmap_entry *pentry; /* pointer to original entry */
  75         unsigned long long addr; /* address for this change point */
  76 };
  77 static struct change_member change_point_list[2*BFIN_MEMMAP_MAX] __initdata;
  78 static struct change_member *change_point[2*BFIN_MEMMAP_MAX] __initdata;
  79 static struct bfin_memmap_entry *overlap_list[BFIN_MEMMAP_MAX] __initdata;
  80 static struct bfin_memmap_entry new_map[BFIN_MEMMAP_MAX] __initdata;
  81
  82 DEFINE_PER_CPU(struct blackfin_cpudata, cpu_data);
  83
  84 static int early_init_clkin_hz(char *buf);
  85
  86 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  87 void __init generate_cplb_tables(void)
  88 {
  89         unsigned int cpu;
  90
  91         generate_cplb_tables_all();
  92         /* Generate per-CPU I&D CPLB tables */
  93         for (cpu = 0; cpu < num_possible_cpus(); ++cpu)
  94                 generate_cplb_tables_cpu(cpu);
  95 }
  96 #endif
  97
  98 void __cpuinit bfin_setup_caches(unsigned int cpu)
  99 {
 100 #ifdef CONFIG_BFIN_ICACHE
 101         bfin_icache_init(icplb_tbl[cpu]);
 102 #endif
 103
 104 #ifdef CONFIG_BFIN_DCACHE
 105         bfin_dcache_init(dcplb_tbl[cpu]);
 106 #endif
 107
 108         /*
 109          * In cache coherence emulation mode, we need to have the
 110          * D-cache enabled before running any atomic operation which
 111          * might involve cache invalidation (i.e. spinlock, rwlock).
 112          * So printk's are deferred until then.
 113          */
 114 #ifdef CONFIG_BFIN_ICACHE
 115         printk(KERN_INFO "Instruction Cache Enabled for CPU%u\n", cpu);
 116         printk(KERN_INFO "  External memory:"
 117 # ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
 118                " cacheable"
 119 # else
 120                " uncacheable"
 121 # endif
 122                " in instruction cache\n");
 123         if (L2_LENGTH)
 124                 printk(KERN_INFO "  L2 SRAM        :"
 125 # ifdef CONFIG_BFIN_L2_ICACHEABLE
 126                        " cacheable"
 127 # else
 128                        " uncacheable"
 129 # endif
 130                        " in instruction cache\n");
 131
 132 #else
 133         printk(KERN_INFO "Instruction Cache Disabled for CPU%u\n", cpu);
 134 #endif
 135
 136 #ifdef CONFIG_BFIN_DCACHE
 137         printk(KERN_INFO "Data Cache Enabled for CPU%u\n", cpu);
 138         printk(KERN_INFO "  External memory:"
 139 # if defined CONFIG_BFIN_EXTMEM_WRITEBACK
 140                " cacheable (write-back)"
 141 # elif defined CONFIG_BFIN_EXTMEM_WRITETHROUGH
 142                " cacheable (write-through)"
 143 # else
 144                " uncacheable"
 145 # endif
 146                " in data cache\n");
 147         if (L2_LENGTH)
 148                 printk(KERN_INFO "  L2 SRAM        :"
 149 # if defined CONFIG_BFIN_L2_WRITEBACK
 150                        " cacheable (write-back)"
 151 # elif defined CONFIG_BFIN_L2_WRITETHROUGH
 152                        " cacheable (write-through)"
 153 # else
 154                        " uncacheable"
 155 # endif
 156                        " in data cache\n");
 157 #else
 158         printk(KERN_INFO "Data Cache Disabled for CPU%u\n", cpu);
 159 #endif
 160 }
 161
 162 void __cpuinit bfin_setup_cpudata(unsigned int cpu)
 163 {
 164         struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu);
 165
 166         cpudata->idle = current;
 167         cpudata->imemctl = bfin_read_IMEM_CONTROL();
 168         cpudata->dmemctl = bfin_read_DMEM_CONTROL();
 169 }
 170
 171 void __init bfin_cache_init(void)
 172 {
 173 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
 174         generate_cplb_tables();
 175 #endif
 176         bfin_setup_caches(0);
 177 }
 178
 179 void __init bfin_relocate_l1_mem(void)
 180 {
 181         unsigned long text_l1_len = (unsigned long)_text_l1_len;
 182         unsigned long data_l1_len = (unsigned long)_data_l1_len;
 183         unsigned long data_b_l1_len = (unsigned long)_data_b_l1_len;
 184         unsigned long l2_len = (unsigned long)_l2_len;
 185
 186         early_shadow_stamp();
 187
 188         /*
 189          * due to the ALIGN(4) in the arch/blackfin/kernel/vmlinux.lds.S
 190          * we know that everything about l1 text/data is nice and aligned,
 191          * so copy by 4 byte chunks, and don't worry about overlapping
 192          * src/dest.
 193          *
 194          * We can't use the dma_memcpy functions, since they can call
 195          * scheduler functions which might be in L1 :( and core writes
 196          * into L1 instruction cause bad access errors, so we are stuck,
 197          * we are required to use DMA, but can't use the common dma
 198          * functions. We can't use memcpy either - since that might be
 199          * going to be in the relocated L1
 200          */
 201
 202         blackfin_dma_early_init();
 203
 204         /* if necessary, copy L1 text to L1 instruction SRAM */
 205         if (L1_CODE_LENGTH && text_l1_len)
 206                 early_dma_memcpy(_stext_l1, _text_l1_lma, text_l1_len);
 207
 208         /* if necessary, copy L1 data to L1 data bank A SRAM */
 209         if (L1_DATA_A_LENGTH && data_l1_len)
 210                 early_dma_memcpy(_sdata_l1, _data_l1_lma, data_l1_len);
 211
 212         /* if necessary, copy L1 data B to L1 data bank B SRAM */
 213         if (L1_DATA_B_LENGTH && data_b_l1_len)
 214                 early_dma_memcpy(_sdata_b_l1, _data_b_l1_lma, data_b_l1_len);
 215
 216         early_dma_memcpy_done();
 217
 218         /* if necessary, copy L2 text/data to L2 SRAM */
 219         if (L2_LENGTH && l2_len)
 220                 memcpy(_stext_l2, _l2_lma, l2_len);
 221 }
 222
 223 /* add_memory_region to memmap */
 224 static void __init add_memory_region(unsigned long long start,
 225                               unsigned long long size, int type)
 226 {
 227         int i;
 228
 229         i = bfin_memmap.nr_map;
 230
 231         if (i == BFIN_MEMMAP_MAX) {
 232                 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 233                 return;
 234         }
 235
 236         bfin_memmap.map[i].addr = start;
 237         bfin_memmap.map[i].size = size;
 238         bfin_memmap.map[i].type = type;
 239         bfin_memmap.nr_map++;
 240 }
 241
 242 /*
 243  * Sanitize the boot memmap, removing overlaps.
 244  */
 245 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
 246 {
 247         struct change_member *change_tmp;
 248         unsigned long current_type, last_type;
 249         unsigned long long last_addr;
 250         int chgidx, still_changing;
 251         int overlap_entries;
 252         int new_entry;
 253         int old_nr, new_nr, chg_nr;
 254         int i;
 255
 256         /*
 257                 Visually we're performing the following (1,2,3,4 = memory types)
 258
 259                 Sample memory map (w/overlaps):
 260                    ____22__________________
 261                    ______________________4_
 262                    ____1111________________
 263                    _44_____________________
 264                    11111111________________
 265                    ____________________33__
 266                    ___________44___________
 267                    __________33333_________
 268                    ______________22________
 269                    ___________________2222_
 270                    _________111111111______
 271                    _____________________11_
 272                    _________________4______
 273
 274                 Sanitized equivalent (no overlap):
 275                    1_______________________
 276                    _44_____________________
 277                    ___1____________________
 278                    ____22__________________
 279                    ______11________________
 280                    _________1______________
 281                    __________3_____________
 282                    ___________44___________
 283                    _____________33_________
 284                    _______________2________
 285                    ________________1_______
 286                    _________________4______
 287                    ___________________2____
 288                    ____________________33__
 289                    ______________________4_
 290         */
 291         /* if there's only one memory region, don't bother */
 292         if (*pnr_map < 2)
 293                 return -1;
 294
 295         old_nr = *pnr_map;
 296
 297         /* bail out if we find any unreasonable addresses in memmap */
 298         for (i = 0; i < old_nr; i++)
 299                 if (map[i].addr + map[i].size < map[i].addr)
 300                         return -1;
 301
 302         /* create pointers for initial change-point information (for sorting) */
 303         for (i = 0; i < 2*old_nr; i++)
 304                 change_point[i] = &change_point_list[i];
 305
 306         /* record all known change-points (starting and ending addresses),
 307            omitting those that are for empty memory regions */
 308         chgidx = 0;
 309         for (i = 0; i < old_nr; i++) {
 310                 if (map[i].size != 0) {
 311                         change_point[chgidx]->addr = map[i].addr;
 312                         change_point[chgidx++]->pentry = &map[i];
 313                         change_point[chgidx]->addr = map[i].addr + map[i].size;
 314                         change_point[chgidx++]->pentry = &map[i];
 315                 }
 316         }
 317         chg_nr = chgidx;        /* true number of change-points */
 318
 319         /* sort change-point list by memory addresses (low -> high) */
 320         still_changing = 1;
 321         while (still_changing) {
 322                 still_changing = 0;
 323                 for (i = 1; i < chg_nr; i++) {
 324                         /* if <current_addr> > <last_addr>, swap */
 325                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 326                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 327                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 328                                  (change_point[i]->addr == change_point[i]->pentry->addr) &&
 329                                  (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
 330                            ) {
 331                                 change_tmp = change_point[i];
 332                                 change_point[i] = change_point[i-1];
 333                                 change_point[i-1] = change_tmp;
 334                                 still_changing = 1;
 335                         }
 336                 }
 337         }
 338
 339         /* create a new memmap, removing overlaps */
 340         overlap_entries = 0;    /* number of entries in the overlap table */
 341         new_entry = 0;          /* index for creating new memmap entries */
 342         last_type = 0;          /* start with undefined memory type */
 343         last_addr = 0;          /* start with 0 as last starting address */
 344         /* loop through change-points, determining affect on the new memmap */
 345         for (chgidx = 0; chgidx < chg_nr; chgidx++) {
 346                 /* keep track of all overlapping memmap entries */
 347                 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
 348                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 349                         overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
 350                 } else {
 351                         /* remove entry from list (order independent, so swap with last) */
 352                         for (i = 0; i < overlap_entries; i++) {
 353                                 if (overlap_list[i] == change_point[chgidx]->pentry)
 354                                         overlap_list[i] = overlap_list[overlap_entries-1];
 355                         }
 356                         overlap_entries--;
 357                 }
 358                 /* if there are overlapping entries, decide which "type" to use */
 359                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 360                 current_type = 0;
 361                 for (i = 0; i < overlap_entries; i++)
 362                         if (overlap_list[i]->type > current_type)
 363                                 current_type = overlap_list[i]->type;
 364                 /* continue building up new memmap based on this information */
 365                 if (current_type != last_type) {
 366                         if (last_type != 0) {
 367                                 new_map[new_entry].size =
 368                                         change_point[chgidx]->addr - last_addr;
 369                                 /* move forward only if the new size was non-zero */
 370                                 if (new_map[new_entry].size != 0)
 371                                         if (++new_entry >= BFIN_MEMMAP_MAX)
 372                                                 break;  /* no more space left for new entries */
 373                         }
 374                         if (current_type != 0) {
 375                                 new_map[new_entry].addr = change_point[chgidx]->addr;
 376                                 new_map[new_entry].type = current_type;
 377                                 last_addr = change_point[chgidx]->addr;
 378                         }
 379                         last_type = current_type;
 380                 }
 381         }
 382         new_nr = new_entry;     /* retain count for new entries */
 383
 384         /* copy new mapping into original location */
 385         memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
 386         *pnr_map = new_nr;
 387
 388         return 0;
 389 }
 390
 391 static void __init print_memory_map(char *who)
 392 {
 393         int i;
 394
 395         for (i = 0; i < bfin_memmap.nr_map; i++) {
 396                 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
 397                         bfin_memmap.map[i].addr,
 398                         bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
 399                 switch (bfin_memmap.map[i].type) {
 400                 case BFIN_MEMMAP_RAM:
 401                         printk(KERN_CONT "(usable)\n");
 402                         break;
 403                 case BFIN_MEMMAP_RESERVED:
 404                         printk(KERN_CONT "(reserved)\n");
 405                         break;
 406                 default:
 407                         printk(KERN_CONT "type %lu\n", bfin_memmap.map[i].type);
 408                         break;
 409                 }
 410         }
 411 }
 412
 413 static __init int parse_memmap(char *arg)
 414 {
 415         unsigned long long start_at, mem_size;
 416
 417         if (!arg)
 418                 return -EINVAL;
 419
 420         mem_size = memparse(arg, &arg);
 421         if (*arg == '@') {
 422                 start_at = memparse(arg+1, &arg);
 423                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 424         } else if (*arg == '$') {
 425                 start_at = memparse(arg+1, &arg);
 426                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 427         }
 428
 429         return 0;
 430 }
 431
 432 /*
 433  * Initial parsing of the command line.  Currently, we support:
 434  *  - Controlling the linux memory size: mem=xxx[KMG]
 435  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 436  *       $ -> reserved memory is dcacheable
 437  *       # -> reserved memory is icacheable
 438  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 439  *       @ from <start> to <start>+<mem>, type RAM
 440  *       $ from <start> to <start>+<mem>, type RESERVED
 441  */
 442 static __init void parse_cmdline_early(char *cmdline_p)
 443 {
 444         char c = ' ', *to = cmdline_p;
 445         unsigned int memsize;
 446         for (;;) {
 447                 if (c == ' ') {
 448                         if (!memcmp(to, "mem=", 4)) {
 449                                 to += 4;
 450                                 memsize = memparse(to, &to);
 451                                 if (memsize)
 452                                         _ramend = memsize;
 453
 454                         } else if (!memcmp(to, "max_mem=", 8)) {
 455                                 to += 8;
 456                                 memsize = memparse(to, &to);
 457                                 if (memsize) {
 458                                         physical_mem_end = memsize;
 459                                         if (*to != ' ') {
 460                                                 if (*to == '$'
 461                                                     || *(to + 1) == '$')
 462                                                         reserved_mem_dcache_on = 1;
 463                                                 if (*to == '#'
 464                                                     || *(to + 1) == '#')
 465                                                         reserved_mem_icache_on = 1;
 466                                         }
 467                                 }
 468                         } else if (!memcmp(to, "clkin_hz=", 9)) {
 469                                 to += 9;
 470                                 early_init_clkin_hz(to);
 471 #ifdef CONFIG_EARLY_PRINTK
 472                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 473                                 to += 12;
 474                                 setup_early_printk(to);
 475 #endif
 476                         } else if (!memcmp(to, "memmap=", 7)) {
 477                                 to += 7;
 478                                 parse_memmap(to);
 479                         }
 480                 }
 481                 c = *(to++);
 482                 if (!c)
 483                         break;
 484         }
 485 }
 486
 487 /*
 488  * Setup memory defaults from user config.
 489  * The physical memory layout looks like:
 490  *
 491  *  [_rambase, _ramstart]:              kernel image
 492  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 493  *  [memory_end, _ramend]:              reserved memory
 494  *      [memory_mtd_start(memory_end),
 495  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 496  *      [_ramend - DMA_UNCACHED_REGION,
 497  *              _ramend]:                       uncached DMA region
 498  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 499  */
 500 static __init void memory_setup(void)
 501 {
 502 #ifdef CONFIG_MTD_UCLINUX
 503         unsigned long mtd_phys = 0;
 504 #endif
 505         unsigned long max_mem;
 506
 507         _rambase = (unsigned long)_stext;
 508         _ramstart = (unsigned long)_end;
 509
 510         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 511                 console_init();
 512                 panic("DMA region exceeds memory limit: %lu.",
 513                         _ramend - _ramstart);
 514         }
 515         max_mem = memory_end = _ramend - DMA_UNCACHED_REGION;
 516
 517 #if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 518         /* Due to a Hardware Anomaly we need to limit the size of usable
 519          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 520          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 521          */
 522 # if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 523         if (max_mem >= 56 * 1024 * 1024)
 524                 max_mem = 56 * 1024 * 1024;
 525 # else
 526         if (max_mem >= 60 * 1024 * 1024)
 527                 max_mem = 60 * 1024 * 1024;
 528 # endif                         /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 529 #endif                          /* ANOMALY_05000263 */
 530
 531
 532 #ifdef CONFIG_MPU
 533         /* Round up to multiple of 4MB */
 534         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 535 #else
 536         memory_start = PAGE_ALIGN(_ramstart);
 537 #endif
 538
 539 #if defined(CONFIG_MTD_UCLINUX)
 540         /* generic memory mapped MTD driver */
 541         memory_mtd_end = memory_end;
 542
 543         mtd_phys = _ramstart;
 544         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 545
 546 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 547         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 548                 mtd_size =
 549                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 550 # endif
 551
 552 # if defined(CONFIG_CRAMFS)
 553         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 554                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 555 # endif
 556
 557 # if defined(CONFIG_ROMFS_FS)
 558         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 559             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1) {
 560                 mtd_size =
 561                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 562
 563                 /* ROM_FS is XIP, so if we found it, we need to limit memory */
 564                 if (memory_end > max_mem) {
 565                         pr_info("Limiting kernel memory to %liMB due to anomaly 05000263\n", max_mem >> 20);
 566                         memory_end = max_mem;
 567                 }
 568         }
 569 # endif                         /* CONFIG_ROMFS_FS */
 570
 571         /* Since the default MTD_UCLINUX has no magic number, we just blindly
 572          * read 8 past the end of the kernel's image, and look at it.
 573          * When no image is attached, mtd_size is set to a random number
 574          * Do some basic sanity checks before operating on things
 575          */
 576         if (mtd_size == 0 || memory_end <= mtd_size) {
 577                 pr_emerg("Could not find valid ram mtd attached.\n");
 578         } else {
 579                 memory_end -= mtd_size;
 580
 581                 /* Relocate MTD image to the top of memory after the uncached memory area */
 582                 uclinux_ram_map.phys = memory_mtd_start = memory_end;
 583                 uclinux_ram_map.size = mtd_size;
 584                 pr_info("Found mtd parition at 0x%p, (len=0x%lx), moving to 0x%p\n",
 585                         _end, mtd_size, (void *)memory_mtd_start);
 586                 dma_memcpy((void *)uclinux_ram_map.phys, _end, uclinux_ram_map.size);
 587         }
 588 #endif                          /* CONFIG_MTD_UCLINUX */
 589
 590         /* We need lo limit memory, since everything could have a text section
 591          * of userspace in it, and expose anomaly 05000263. If the anomaly
 592          * doesn't exist, or we don't need to - then dont.
 593          */
 594         if (memory_end > max_mem) {
 595                 pr_info("Limiting kernel memory to %liMB due to anomaly 05000263\n", max_mem >> 20);
 596                 memory_end = max_mem;
 597         }
 598
 599 #ifdef CONFIG_MPU
 600         page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
 601         page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
 602 #endif
 603
 604         init_mm.start_code = (unsigned long)_stext;
 605         init_mm.end_code = (unsigned long)_etext;
 606         init_mm.end_data = (unsigned long)_edata;
 607         init_mm.brk = (unsigned long)0;
 608
 609         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 610         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 611
 612         printk(KERN_INFO "Memory map:\n"
 613                "  fixedcode = 0x%p-0x%p\n"
 614                "  text      = 0x%p-0x%p\n"
 615                "  rodata    = 0x%p-0x%p\n"
 616                "  bss       = 0x%p-0x%p\n"
 617                "  data      = 0x%p-0x%p\n"
 618                "    stack   = 0x%p-0x%p\n"
 619                "  init      = 0x%p-0x%p\n"
 620                "  available = 0x%p-0x%p\n"
 621 #ifdef CONFIG_MTD_UCLINUX
 622                "  rootfs    = 0x%p-0x%p\n"
 623 #endif
 624 #if DMA_UNCACHED_REGION > 0
 625                "  DMA Zone  = 0x%p-0x%p\n"
 626 #endif
 627                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 628                 _stext, _etext,
 629                 __start_rodata, __end_rodata,
 630                 __bss_start, __bss_stop,
 631                 _sdata, _edata,
 632                 (void *)&init_thread_union,
 633                 (void *)((int)(&init_thread_union) + 0x2000),
 634                 __init_begin, __init_end,
 635                 (void *)_ramstart, (void *)memory_end
 636 #ifdef CONFIG_MTD_UCLINUX
 637                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 638 #endif
 639 #if DMA_UNCACHED_REGION > 0
 640                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 641 #endif
 642                 );
 643 }
 644
 645 /*
 646  * Find the lowest, highest page frame number we have available
 647  */
 648 void __init find_min_max_pfn(void)
 649 {
 650         int i;
 651
 652         max_pfn = 0;
 653         min_low_pfn = memory_end;
 654
 655         for (i = 0; i < bfin_memmap.nr_map; i++) {
 656                 unsigned long start, end;
 657                 /* RAM? */
 658                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 659                         continue;
 660                 start = PFN_UP(bfin_memmap.map[i].addr);
 661                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 662                                 bfin_memmap.map[i].size);
 663                 if (start >= end)
 664                         continue;
 665                 if (end > max_pfn)
 666                         max_pfn = end;
 667                 if (start < min_low_pfn)
 668                         min_low_pfn = start;
 669         }
 670 }
 671
 672 static __init void setup_bootmem_allocator(void)
 673 {
 674         int bootmap_size;
 675         int i;
 676         unsigned long start_pfn, end_pfn;
 677         unsigned long curr_pfn, last_pfn, size;
 678
 679         /* mark memory between memory_start and memory_end usable */
 680         add_memory_region(memory_start,
 681                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 682         /* sanity check for overlap */
 683         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 684         print_memory_map("boot memmap");
 685
 686         /* initialize globals in linux/bootmem.h */
 687         find_min_max_pfn();
 688         /* pfn of the last usable page frame */
 689         if (max_pfn > memory_end >> PAGE_SHIFT)
 690                 max_pfn = memory_end >> PAGE_SHIFT;
 691         /* pfn of last page frame directly mapped by kernel */
 692         max_low_pfn = max_pfn;
 693         /* pfn of the first usable page frame after kernel image*/
 694         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 695                 min_low_pfn = memory_start >> PAGE_SHIFT;
 696
 697         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 698         end_pfn = memory_end >> PAGE_SHIFT;
 699
 700         /*
 701          * give all the memory to the bootmap allocator, tell it to put the
 702          * boot mem_map at the start of memory.
 703          */
 704         bootmap_size = init_bootmem_node(NODE_DATA(0),
 705                         memory_start >> PAGE_SHIFT,     /* map goes here */
 706                         start_pfn, end_pfn);
 707
 708         /* register the memmap regions with the bootmem allocator */
 709         for (i = 0; i < bfin_memmap.nr_map; i++) {
 710                 /*
 711                  * Reserve usable memory
 712                  */
 713                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 714                         continue;
 715                 /*
 716                  * We are rounding up the start address of usable memory:
 717                  */
 718                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 719                 if (curr_pfn >= end_pfn)
 720                         continue;
 721                 /*
 722                  * ... and at the end of the usable range downwards:
 723                  */
 724                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 725                                          bfin_memmap.map[i].size);
 726
 727                 if (last_pfn > end_pfn)
 728                         last_pfn = end_pfn;
 729
 730                 /*
 731                  * .. finally, did all the rounding and playing
 732                  * around just make the area go away?
 733                  */
 734                 if (last_pfn <= curr_pfn)
 735                         continue;
 736
 737                 size = last_pfn - curr_pfn;
 738                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 739         }
 740
 741         /* reserve memory before memory_start, including bootmap */
 742         reserve_bootmem(PAGE_OFFSET,
 743                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 744                 BOOTMEM_DEFAULT);
 745 }
 746
 747 #define EBSZ_TO_MEG(ebsz) \
 748 ({ \
 749         int meg = 0; \
 750         switch (ebsz & 0xf) { \
 751                 case 0x1: meg =  16; break; \
 752                 case 0x3: meg =  32; break; \
 753                 case 0x5: meg =  64; break; \
 754                 case 0x7: meg = 128; break; \
 755                 case 0x9: meg = 256; break; \
 756                 case 0xb: meg = 512; break; \
 757         } \
 758         meg; \
 759 })
 760 static inline int __init get_mem_size(void)
 761 {
 762 #if defined(EBIU_SDBCTL)
 763 # if defined(BF561_FAMILY)
 764         int ret = 0;
 765         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 766         ret += EBSZ_TO_MEG(sdbctl >>  0);
 767         ret += EBSZ_TO_MEG(sdbctl >>  8);
 768         ret += EBSZ_TO_MEG(sdbctl >> 16);
 769         ret += EBSZ_TO_MEG(sdbctl >> 24);
 770         return ret;
 771 # else
 772         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 773 # endif
 774 #elif defined(EBIU_DDRCTL1)
 775         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 776         int ret = 0;
 777         switch (ddrctl & 0xc0000) {
 778                 case DEVSZ_64:  ret = 64 / 8;
 779                 case DEVSZ_128: ret = 128 / 8;
 780                 case DEVSZ_256: ret = 256 / 8;
 781                 case DEVSZ_512: ret = 512 / 8;
 782         }
 783         switch (ddrctl & 0x30000) {
 784                 case DEVWD_4:  ret *= 2;
 785                 case DEVWD_8:  ret *= 2;
 786                 case DEVWD_16: break;
 787         }
 788         if ((ddrctl & 0xc000) == 0x4000)
 789                 ret *= 2;
 790         return ret;
 791 #endif
 792         BUG();
 793 }
 794
 795 void __init setup_arch(char **cmdline_p)
 796 {
 797         unsigned long sclk, cclk;
 798
 799         enable_shadow_console();
 800
 801         /* Check to make sure we are running on the right processor */
 802         if (unlikely(CPUID != bfin_cpuid()))
 803                 printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
 804                         CPU, bfin_cpuid(), bfin_revid());
 805
 806 #ifdef CONFIG_DUMMY_CONSOLE
 807         conswitchp = &dummy_con;
 808 #endif
 809
 810 #if defined(CONFIG_CMDLINE_BOOL)
 811         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 812         command_line[sizeof(command_line) - 1] = 0;
 813 #endif
 814
 815         /* Keep a copy of command line */
 816         *cmdline_p = &command_line[0];
 817         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 818         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 819
 820         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 821
 822         /* If the user does not specify things on the command line, use
 823          * what the bootloader set things up as
 824          */
 825         physical_mem_end = 0;
 826         parse_cmdline_early(&command_line[0]);
 827
 828         if (_ramend == 0)
 829                 _ramend = get_mem_size() * 1024 * 1024;
 830
 831         if (physical_mem_end == 0)
 832                 physical_mem_end = _ramend;
 833
 834         memory_setup();
 835
 836         /* Initialize Async memory banks */
 837         bfin_write_EBIU_AMBCTL0(AMBCTL0VAL);
 838         bfin_write_EBIU_AMBCTL1(AMBCTL1VAL);
 839         bfin_write_EBIU_AMGCTL(AMGCTLVAL);
 840 #ifdef CONFIG_EBIU_MBSCTLVAL
 841         bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL);
 842         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
 843         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 844 #endif
 845
 846         cclk = get_cclk();
 847         sclk = get_sclk();
 848
 849         if ((ANOMALY_05000273 || ANOMALY_05000274) && (cclk >> 1) < sclk)
 850                 panic("ANOMALY 05000273 or 05000274: CCLK must be >= 2*SCLK");
 851
 852 #ifdef BF561_FAMILY
 853         if (ANOMALY_05000266) {
 854                 bfin_read_IMDMA_D0_IRQ_STATUS();
 855                 bfin_read_IMDMA_D1_IRQ_STATUS();
 856         }
 857 #endif
 858         printk(KERN_INFO "Hardware Trace ");
 859         if (bfin_read_TBUFCTL() & 0x1)
 860                 printk(KERN_CONT "Active ");
 861         else
 862                 printk(KERN_CONT "Off ");
 863         if (bfin_read_TBUFCTL() & 0x2)
 864                 printk(KERN_CONT "and Enabled\n");
 865         else
 866                 printk(KERN_CONT "and Disabled\n");
 867
 868         printk(KERN_INFO "Boot Mode: %i\n", bfin_read_SYSCR() & 0xF);
 869
 870         /* Newer parts mirror SWRST bits in SYSCR */
 871 #if defined(CONFIG_BF53x) || defined(CONFIG_BF561) || \
 872     defined(CONFIG_BF538) || defined(CONFIG_BF539)
 873         _bfin_swrst = bfin_read_SWRST();
 874 #else
 875         /* Clear boot mode field */
 876         _bfin_swrst = bfin_read_SYSCR() & ~0xf;
 877 #endif
 878
 879 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 880         bfin_write_SWRST(_bfin_swrst & ~DOUBLE_FAULT);
 881 #endif
 882 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
 883         bfin_write_SWRST(_bfin_swrst | DOUBLE_FAULT);
 884 #endif
 885
 886 #ifdef CONFIG_SMP
 887         if (_bfin_swrst & SWRST_DBL_FAULT_A) {
 888 #else
 889         if (_bfin_swrst & RESET_DOUBLE) {
 890 #endif
 891                 printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
 892 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 893                 /* We assume the crashing kernel, and the current symbol table match */
 894                 printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
 895                         (int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
 896                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
 897                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
 898 #endif
 899                 printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
 900                         init_retx);
 901         } else if (_bfin_swrst & RESET_WDOG)
 902                 printk(KERN_INFO "Recovering from Watchdog event\n");
 903         else if (_bfin_swrst & RESET_SOFTWARE)
 904                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 905
 906         printk(KERN_INFO "Blackfin support (C) 2004-2009 Analog Devices, Inc.\n");
 907         if (bfin_compiled_revid() == 0xffff)
 908                 printk(KERN_INFO "Compiled for ADSP-%s Rev any, running on 0.%d\n", CPU, bfin_revid());
 909         else if (bfin_compiled_revid() == -1)
 910                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 911         else
 912                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 913
 914         if (likely(CPUID == bfin_cpuid())) {
 915                 if (bfin_revid() != bfin_compiled_revid()) {
 916                         if (bfin_compiled_revid() == -1)
 917                                 printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 918                                        bfin_revid());
 919                         else if (bfin_compiled_revid() != 0xffff) {
 920                                 printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 921                                        bfin_compiled_revid(), bfin_revid());
 922                                 if (bfin_compiled_revid() > bfin_revid())
 923                                         panic("Error: you are missing anomaly workarounds for this rev");
 924                         }
 925                 }
 926                 if (bfin_revid() < CONFIG_BF_REV_MIN || bfin_revid() > CONFIG_BF_REV_MAX)
 927                         printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 928                                CPU, bfin_revid());
 929         }
 930
 931         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 932
 933         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 934                cclk / 1000000, sclk / 1000000);
 935
 936         setup_bootmem_allocator();
 937
 938         paging_init();
 939
 940         /* Copy atomic sequences to their fixed location, and sanity check that
 941            these locations are the ones that we advertise to userspace.  */
 942         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 943                FIXED_CODE_END - FIXED_CODE_START);
 944         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 945                != SIGRETURN_STUB - FIXED_CODE_START);
 946         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 947                != ATOMIC_XCHG32 - FIXED_CODE_START);
 948         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 949                != ATOMIC_CAS32 - FIXED_CODE_START);
 950         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 951                != ATOMIC_ADD32 - FIXED_CODE_START);
 952         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 953                != ATOMIC_SUB32 - FIXED_CODE_START);
 954         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 955                != ATOMIC_IOR32 - FIXED_CODE_START);
 956         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 957                != ATOMIC_AND32 - FIXED_CODE_START);
 958         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 959                != ATOMIC_XOR32 - FIXED_CODE_START);
 960         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 961                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 962
 963 #ifdef CONFIG_SMP
 964         platform_init_cpus();
 965 #endif
 966         init_exception_vectors();
 967         bfin_cache_init();      /* Initialize caches for the boot CPU */
 968 }
 969
 970 static int __init topology_init(void)
 971 {
 972         unsigned int cpu;
 973         /* Record CPU-private information for the boot processor. */
 974         bfin_setup_cpudata(0);
 975
 976         for_each_possible_cpu(cpu) {
 977                 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
 978         }
 979
 980         return 0;
 981 }
 982
 983 subsys_initcall(topology_init);
 984
 985 /* Get the input clock frequency */
 986 static u_long cached_clkin_hz = CONFIG_CLKIN_HZ;
 987 static u_long get_clkin_hz(void)
 988 {
 989         return cached_clkin_hz;
 990 }
 991 static int __init early_init_clkin_hz(char *buf)
 992 {
 993         cached_clkin_hz = simple_strtoul(buf, NULL, 0);
 994 #ifdef BFIN_KERNEL_CLOCK
 995         if (cached_clkin_hz != CONFIG_CLKIN_HZ)
 996                 panic("cannot change clkin_hz when reprogramming clocks");
 997 #endif
 998         return 1;
 999 }
1000 early_param("clkin_hz=", early_init_clkin_hz);
1001
1002 /* Get the voltage input multiplier */
1003 static u_long get_vco(void)
1004 {
1005         static u_long cached_vco;
1006         u_long msel, pll_ctl;
1007
1008         /* The assumption here is that VCO never changes at runtime.
1009          * If, someday, we support that, then we'll have to change this.
1010          */
1011         if (cached_vco)
1012                 return cached_vco;
1013
1014         pll_ctl = bfin_read_PLL_CTL();
1015         msel = (pll_ctl >> 9) & 0x3F;
1016         if (0 == msel)
1017                 msel = 64;
1018
1019         cached_vco = get_clkin_hz();
1020         cached_vco >>= (1 & pll_ctl);   /* DF bit */
1021         cached_vco *= msel;
1022         return cached_vco;
1023 }
1024
1025 /* Get the Core clock */
1026 u_long get_cclk(void)
1027 {
1028         static u_long cached_cclk_pll_div, cached_cclk;
1029         u_long csel, ssel;
1030
1031         if (bfin_read_PLL_STAT() & 0x1)
1032                 return get_clkin_hz();
1033
1034         ssel = bfin_read_PLL_DIV();
1035         if (ssel == cached_cclk_pll_div)
1036                 return cached_cclk;
1037         else
1038                 cached_cclk_pll_div = ssel;
1039
1040         csel = ((ssel >> 4) & 0x03);
1041         ssel &= 0xf;
1042         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
1043                 cached_cclk = get_vco() / ssel;
1044         else
1045                 cached_cclk = get_vco() >> csel;
1046         return cached_cclk;
1047 }
1048 EXPORT_SYMBOL(get_cclk);
1049
1050 /* Get the System clock */
1051 u_long get_sclk(void)
1052 {
1053         static u_long cached_sclk;
1054         u_long ssel;
1055
1056         /* The assumption here is that SCLK never changes at runtime.
1057          * If, someday, we support that, then we'll have to change this.
1058          */
1059         if (cached_sclk)
1060                 return cached_sclk;
1061
1062         if (bfin_read_PLL_STAT() & 0x1)
1063                 return get_clkin_hz();
1064
1065         ssel = bfin_read_PLL_DIV() & 0xf;
1066         if (0 == ssel) {
1067                 printk(KERN_WARNING "Invalid System Clock\n");
1068                 ssel = 1;
1069         }
1070
1071         cached_sclk = get_vco() / ssel;
1072         return cached_sclk;
1073 }
1074 EXPORT_SYMBOL(get_sclk);
1075
1076 unsigned long sclk_to_usecs(unsigned long sclk)
1077 {
1078         u64 tmp = USEC_PER_SEC * (u64)sclk;
1079         do_div(tmp, get_sclk());
1080         return tmp;
1081 }
1082 EXPORT_SYMBOL(sclk_to_usecs);
1083
1084 unsigned long usecs_to_sclk(unsigned long usecs)
1085 {
1086         u64 tmp = get_sclk() * (u64)usecs;
1087         do_div(tmp, USEC_PER_SEC);
1088         return tmp;
1089 }
1090 EXPORT_SYMBOL(usecs_to_sclk);
1091
1092 /*
1093  *      Get CPU information for use by the procfs.
1094  */
1095 static int show_cpuinfo(struct seq_file *m, void *v)
1096 {
1097         char *cpu, *mmu, *fpu, *vendor, *cache;
1098         uint32_t revid;
1099         int cpu_num = *(unsigned int *)v;
1100         u_long sclk, cclk;
1101         u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
1102         struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu_num);
1103
1104         cpu = CPU;
1105         mmu = "none";
1106         fpu = "none";
1107         revid = bfin_revid();
1108
1109         sclk = get_sclk();
1110         cclk = get_cclk();
1111
1112         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
1113         case 0xca:
1114                 vendor = "Analog Devices";
1115                 break;
1116         default:
1117                 vendor = "unknown";
1118                 break;
1119         }
1120
1121         seq_printf(m, "processor\t: %d\n" "vendor_id\t: %s\n", cpu_num, vendor);
1122
1123         if (CPUID == bfin_cpuid())
1124                 seq_printf(m, "cpu family\t: 0x%04x\n", CPUID);
1125         else
1126                 seq_printf(m, "cpu family\t: Compiled for:0x%04x, running on:0x%04x\n",
1127                         CPUID, bfin_cpuid());
1128
1129         seq_printf(m, "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1130                 "stepping\t: %d ",
1131                 cpu, cclk/1000000, sclk/1000000,
1132 #ifdef CONFIG_MPU
1133                 "mpu on",
1134 #else
1135                 "mpu off",
1136 #endif
1137                 revid);
1138
1139         if (bfin_revid() != bfin_compiled_revid()) {
1140                 if (bfin_compiled_revid() == -1)
1141                         seq_printf(m, "(Compiled for Rev none)");
1142                 else if (bfin_compiled_revid() == 0xffff)
1143                         seq_printf(m, "(Compiled for Rev any)");
1144                 else
1145                         seq_printf(m, "(Compiled for Rev %d)", bfin_compiled_revid());
1146         }
1147
1148         seq_printf(m, "\ncpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1149                 cclk/1000000, cclk%1000000,
1150                 sclk/1000000, sclk%1000000);
1151         seq_printf(m, "bogomips\t: %lu.%02lu\n"
1152                 "Calibration\t: %lu loops\n",
1153                 (loops_per_jiffy * HZ) / 500000,
1154                 ((loops_per_jiffy * HZ) / 5000) % 100,
1155                 (loops_per_jiffy * HZ));
1156
1157         /* Check Cache configutation */
1158         switch (cpudata->dmemctl & (1 << DMC0_P | 1 << DMC1_P)) {
1159         case ACACHE_BSRAM:
1160                 cache = "dbank-A/B\t: cache/sram";
1161                 dcache_size = 16;
1162                 dsup_banks = 1;
1163                 break;
1164         case ACACHE_BCACHE:
1165                 cache = "dbank-A/B\t: cache/cache";
1166                 dcache_size = 32;
1167                 dsup_banks = 2;
1168                 break;
1169         case ASRAM_BSRAM:
1170                 cache = "dbank-A/B\t: sram/sram";
1171                 dcache_size = 0;
1172                 dsup_banks = 0;
1173                 break;
1174         default:
1175                 cache = "unknown";
1176                 dcache_size = 0;
1177                 dsup_banks = 0;
1178                 break;
1179         }
1180
1181         /* Is it turned on? */
1182         if ((cpudata->dmemctl & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1183                 dcache_size = 0;
1184
1185         if ((cpudata->imemctl & (IMC | ENICPLB)) != (IMC | ENICPLB))
1186                 icache_size = 0;
1187
1188         seq_printf(m, "cache size\t: %d KB(L1 icache) "
1189                 "%d KB(L1 dcache) %d KB(L2 cache)\n",
1190                 icache_size, dcache_size, 0);
1191         seq_printf(m, "%s\n", cache);
1192         seq_printf(m, "external memory\t: "
1193 #if defined(CONFIG_BFIN_EXTMEM_ICACHEABLE)
1194                    "cacheable"
1195 #else
1196                    "uncacheable"
1197 #endif
1198                    " in instruction cache\n");
1199         seq_printf(m, "external memory\t: "
1200 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK)
1201                       "cacheable (write-back)"
1202 #elif defined(CONFIG_BFIN_EXTMEM_WRITETHROUGH)
1203                       "cacheable (write-through)"
1204 #else
1205                       "uncacheable"
1206 #endif
1207                       " in data cache\n");
1208
1209         if (icache_size)
1210                 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1211                            BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1212         else
1213                 seq_printf(m, "icache setup\t: off\n");
1214
1215         seq_printf(m,
1216                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1217                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1218                    BFIN_DLINES);
1219 #ifdef __ARCH_SYNC_CORE_DCACHE
1220         seq_printf(m, "SMP Dcache Flushes\t: %lu\n\n", cpudata->dcache_invld_count);
1221 #endif
1222 #ifdef __ARCH_SYNC_CORE_ICACHE
1223         seq_printf(m, "SMP Icache Flushes\t: %lu\n\n", cpudata->icache_invld_count);
1224 #endif
1225
1226         if (cpu_num != num_possible_cpus() - 1)
1227                 return 0;
1228
1229         if (L2_LENGTH) {
1230                 seq_printf(m, "L2 SRAM\t\t: %dKB\n", L2_LENGTH/0x400);
1231                 seq_printf(m, "L2 SRAM\t\t: "
1232 #if defined(CONFIG_BFIN_L2_ICACHEABLE)
1233                               "cacheable"
1234 #else
1235                               "uncacheable"
1236 #endif
1237                               " in instruction cache\n");
1238                 seq_printf(m, "L2 SRAM\t\t: "
1239 #if defined(CONFIG_BFIN_L2_WRITEBACK)
1240                               "cacheable (write-back)"
1241 #elif defined(CONFIG_BFIN_L2_WRITETHROUGH)
1242                               "cacheable (write-through)"
1243 #else
1244                               "uncacheable"
1245 #endif
1246                               " in data cache\n");
1247         }
1248         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1249         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1250                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1251         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1252                 ((int)memory_end - (int)_stext) >> 10,
1253                 _stext,
1254                 (void *)memory_end);
1255         seq_printf(m, "\n");
1256
1257         return 0;
1258 }
1259
1260 static void *c_start(struct seq_file *m, loff_t *pos)
1261 {
1262         if (*pos == 0)
1263                 *pos = first_cpu(cpu_online_map);
1264         if (*pos >= num_online_cpus())
1265                 return NULL;
1266
1267         return pos;
1268 }
1269
1270 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1271 {
1272         *pos = next_cpu(*pos, cpu_online_map);
1273
1274         return c_start(m, pos);
1275 }
1276
1277 static void c_stop(struct seq_file *m, void *v)
1278 {
1279 }
1280
1281 const struct seq_operations cpuinfo_op = {
1282         .start = c_start,
1283         .next = c_next,
1284         .stop = c_stop,
1285         .show = show_cpuinfo,
1286 };
1287
1288 void __init cmdline_init(const char *r0)
1289 {
1290         early_shadow_stamp();
1291         if (r0)
1292                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1293 }