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(KERN_CONT "(usable)\n");
 412                         break;
 413                 case BFIN_MEMMAP_RESERVED:
 414                         printk(KERN_CONT "(reserved)\n");
 415                         break;
 416                 default:
 417                         printk(KERN_CONT "type %lu\n", bfin_memmap.map[i].type);
 418                         break;
 419                 }
 420         }
 421 }
 422
 423 static __init int parse_memmap(char *arg)
 424 {
 425         unsigned long long start_at, mem_size;
 426
 427         if (!arg)
 428                 return -EINVAL;
 429
 430         mem_size = memparse(arg, &arg);
 431         if (*arg == '@') {
 432                 start_at = memparse(arg+1, &arg);
 433                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 434         } else if (*arg == '$') {
 435                 start_at = memparse(arg+1, &arg);
 436                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 437         }
 438
 439         return 0;
 440 }
 441
 442 /*
 443  * Initial parsing of the command line.  Currently, we support:
 444  *  - Controlling the linux memory size: mem=xxx[KMG]
 445  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 446  *       $ -> reserved memory is dcacheable
 447  *       # -> reserved memory is icacheable
 448  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 449  *       @ from <start> to <start>+<mem>, type RAM
 450  *       $ from <start> to <start>+<mem>, type RESERVED
 451  */
 452 static __init void parse_cmdline_early(char *cmdline_p)
 453 {
 454         char c = ' ', *to = cmdline_p;
 455         unsigned int memsize;
 456         for (;;) {
 457                 if (c == ' ') {
 458                         if (!memcmp(to, "mem=", 4)) {
 459                                 to += 4;
 460                                 memsize = memparse(to, &to);
 461                                 if (memsize)
 462                                         _ramend = memsize;
 463
 464                         } else if (!memcmp(to, "max_mem=", 8)) {
 465                                 to += 8;
 466                                 memsize = memparse(to, &to);
 467                                 if (memsize) {
 468                                         physical_mem_end = memsize;
 469                                         if (*to != ' ') {
 470                                                 if (*to == '$'
 471                                                     || *(to + 1) == '$')
 472                                                         reserved_mem_dcache_on = 1;
 473                                                 if (*to == '#'
 474                                                     || *(to + 1) == '#')
 475                                                         reserved_mem_icache_on = 1;
 476                                         }
 477                                 }
 478                         } else if (!memcmp(to, "clkin_hz=", 9)) {
 479                                 to += 9;
 480                                 early_init_clkin_hz(to);
 481 #ifdef CONFIG_EARLY_PRINTK
 482                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 483                                 to += 12;
 484                                 setup_early_printk(to);
 485 #endif
 486                         } else if (!memcmp(to, "memmap=", 7)) {
 487                                 to += 7;
 488                                 parse_memmap(to);
 489                         }
 490                 }
 491                 c = *(to++);
 492                 if (!c)
 493                         break;
 494         }
 495 }
 496
 497 /*
 498  * Setup memory defaults from user config.
 499  * The physical memory layout looks like:
 500  *
 501  *  [_rambase, _ramstart]:              kernel image
 502  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 503  *  [memory_end, _ramend]:              reserved memory
 504  *      [memory_mtd_start(memory_end),
 505  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 506  *      [_ramend - DMA_UNCACHED_REGION,
 507  *              _ramend]:                       uncached DMA region
 508  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 509  */
 510 static __init void memory_setup(void)
 511 {
 512 #ifdef CONFIG_MTD_UCLINUX
 513         unsigned long mtd_phys = 0;
 514 #endif
 515
 516         _rambase = (unsigned long)_stext;
 517         _ramstart = (unsigned long)_end;
 518
 519         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 520                 console_init();
 521                 panic("DMA region exceeds memory limit: %lu.",
 522                         _ramend - _ramstart);
 523         }
 524         memory_end = _ramend - DMA_UNCACHED_REGION;
 525
 526 #ifdef CONFIG_MPU
 527         /* Round up to multiple of 4MB */
 528         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 529 #else
 530         memory_start = PAGE_ALIGN(_ramstart);
 531 #endif
 532
 533 #if defined(CONFIG_MTD_UCLINUX)
 534         /* generic memory mapped MTD driver */
 535         memory_mtd_end = memory_end;
 536
 537         mtd_phys = _ramstart;
 538         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 539
 540 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 541         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 542                 mtd_size =
 543                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 544 # endif
 545
 546 # if defined(CONFIG_CRAMFS)
 547         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 548                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 549 # endif
 550
 551 # if defined(CONFIG_ROMFS_FS)
 552         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 553             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 554                 mtd_size =
 555                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 556 #  if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 557         /* Due to a Hardware Anomaly we need to limit the size of usable
 558          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 559          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 560          */
 561 #   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 562         if (memory_end >= 56 * 1024 * 1024)
 563                 memory_end = 56 * 1024 * 1024;
 564 #   else
 565         if (memory_end >= 60 * 1024 * 1024)
 566                 memory_end = 60 * 1024 * 1024;
 567 #   endif                               /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 568 #  endif                                /* ANOMALY_05000263 */
 569 # endif                         /* CONFIG_ROMFS_FS */
 570
 571         memory_end -= mtd_size;
 572
 573         if (mtd_size == 0) {
 574                 console_init();
 575                 panic("Don't boot kernel without rootfs attached.");
 576         }
 577
 578         /* Relocate MTD image to the top of memory after the uncached memory area */
 579         uclinux_ram_map.phys = memory_mtd_start = memory_end;
 580         uclinux_ram_map.size = mtd_size;
 581         dma_memcpy((void *)uclinux_ram_map.phys, _end, uclinux_ram_map.size);
 582 #endif                          /* CONFIG_MTD_UCLINUX */
 583
 584 #if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
 585         /* Due to a Hardware Anomaly we need to limit the size of usable
 586          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 587          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 588          */
 589 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 590         if (memory_end >= 56 * 1024 * 1024)
 591                 memory_end = 56 * 1024 * 1024;
 592 #else
 593         if (memory_end >= 60 * 1024 * 1024)
 594                 memory_end = 60 * 1024 * 1024;
 595 #endif                          /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 596         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 597 #endif                          /* ANOMALY_05000263 */
 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 #if !defined(CONFIG_MTD_UCLINUX)
 605         /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 606         memory_end -= SIZE_4K;
 607 #endif
 608
 609         init_mm.start_code = (unsigned long)_stext;
 610         init_mm.end_code = (unsigned long)_etext;
 611         init_mm.end_data = (unsigned long)_edata;
 612         init_mm.brk = (unsigned long)0;
 613
 614         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 615         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 616
 617         printk(KERN_INFO "Memory map:\n"
 618                "  fixedcode = 0x%p-0x%p\n"
 619                "  text      = 0x%p-0x%p\n"
 620                "  rodata    = 0x%p-0x%p\n"
 621                "  bss       = 0x%p-0x%p\n"
 622                "  data      = 0x%p-0x%p\n"
 623                "    stack   = 0x%p-0x%p\n"
 624                "  init      = 0x%p-0x%p\n"
 625                "  available = 0x%p-0x%p\n"
 626 #ifdef CONFIG_MTD_UCLINUX
 627                "  rootfs    = 0x%p-0x%p\n"
 628 #endif
 629 #if DMA_UNCACHED_REGION > 0
 630                "  DMA Zone  = 0x%p-0x%p\n"
 631 #endif
 632                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 633                 _stext, _etext,
 634                 __start_rodata, __end_rodata,
 635                 __bss_start, __bss_stop,
 636                 _sdata, _edata,
 637                 (void *)&init_thread_union,
 638                 (void *)((int)(&init_thread_union) + 0x2000),
 639                 __init_begin, __init_end,
 640                 (void *)_ramstart, (void *)memory_end
 641 #ifdef CONFIG_MTD_UCLINUX
 642                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 643 #endif
 644 #if DMA_UNCACHED_REGION > 0
 645                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 646 #endif
 647                 );
 648 }
 649
 650 /*
 651  * Find the lowest, highest page frame number we have available
 652  */
 653 void __init find_min_max_pfn(void)
 654 {
 655         int i;
 656
 657         max_pfn = 0;
 658         min_low_pfn = memory_end;
 659
 660         for (i = 0; i < bfin_memmap.nr_map; i++) {
 661                 unsigned long start, end;
 662                 /* RAM? */
 663                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 664                         continue;
 665                 start = PFN_UP(bfin_memmap.map[i].addr);
 666                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 667                                 bfin_memmap.map[i].size);
 668                 if (start >= end)
 669                         continue;
 670                 if (end > max_pfn)
 671                         max_pfn = end;
 672                 if (start < min_low_pfn)
 673                         min_low_pfn = start;
 674         }
 675 }
 676
 677 static __init void setup_bootmem_allocator(void)
 678 {
 679         int bootmap_size;
 680         int i;
 681         unsigned long start_pfn, end_pfn;
 682         unsigned long curr_pfn, last_pfn, size;
 683
 684         /* mark memory between memory_start and memory_end usable */
 685         add_memory_region(memory_start,
 686                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 687         /* sanity check for overlap */
 688         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 689         print_memory_map("boot memmap");
 690
 691         /* intialize globals in linux/bootmem.h */
 692         find_min_max_pfn();
 693         /* pfn of the last usable page frame */
 694         if (max_pfn > memory_end >> PAGE_SHIFT)
 695                 max_pfn = memory_end >> PAGE_SHIFT;
 696         /* pfn of last page frame directly mapped by kernel */
 697         max_low_pfn = max_pfn;
 698         /* pfn of the first usable page frame after kernel image*/
 699         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 700                 min_low_pfn = memory_start >> PAGE_SHIFT;
 701
 702         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 703         end_pfn = memory_end >> PAGE_SHIFT;
 704
 705         /*
 706          * give all the memory to the bootmap allocator, tell it to put the
 707          * boot mem_map at the start of memory.
 708          */
 709         bootmap_size = init_bootmem_node(NODE_DATA(0),
 710                         memory_start >> PAGE_SHIFT,     /* map goes here */
 711                         start_pfn, end_pfn);
 712
 713         /* register the memmap regions with the bootmem allocator */
 714         for (i = 0; i < bfin_memmap.nr_map; i++) {
 715                 /*
 716                  * Reserve usable memory
 717                  */
 718                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 719                         continue;
 720                 /*
 721                  * We are rounding up the start address of usable memory:
 722                  */
 723                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 724                 if (curr_pfn >= end_pfn)
 725                         continue;
 726                 /*
 727                  * ... and at the end of the usable range downwards:
 728                  */
 729                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 730                                          bfin_memmap.map[i].size);
 731
 732                 if (last_pfn > end_pfn)
 733                         last_pfn = end_pfn;
 734
 735                 /*
 736                  * .. finally, did all the rounding and playing
 737                  * around just make the area go away?
 738                  */
 739                 if (last_pfn <= curr_pfn)
 740                         continue;
 741
 742                 size = last_pfn - curr_pfn;
 743                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 744         }
 745
 746         /* reserve memory before memory_start, including bootmap */
 747         reserve_bootmem(PAGE_OFFSET,
 748                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 749                 BOOTMEM_DEFAULT);
 750 }
 751
 752 #define EBSZ_TO_MEG(ebsz) \
 753 ({ \
 754         int meg = 0; \
 755         switch (ebsz & 0xf) { \
 756                 case 0x1: meg =  16; break; \
 757                 case 0x3: meg =  32; break; \
 758                 case 0x5: meg =  64; break; \
 759                 case 0x7: meg = 128; break; \
 760                 case 0x9: meg = 256; break; \
 761                 case 0xb: meg = 512; break; \
 762         } \
 763         meg; \
 764 })
 765 static inline int __init get_mem_size(void)
 766 {
 767 #if defined(EBIU_SDBCTL)
 768 # if defined(BF561_FAMILY)
 769         int ret = 0;
 770         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 771         ret += EBSZ_TO_MEG(sdbctl >>  0);
 772         ret += EBSZ_TO_MEG(sdbctl >>  8);
 773         ret += EBSZ_TO_MEG(sdbctl >> 16);
 774         ret += EBSZ_TO_MEG(sdbctl >> 24);
 775         return ret;
 776 # else
 777         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 778 # endif
 779 #elif defined(EBIU_DDRCTL1)
 780         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 781         int ret = 0;
 782         switch (ddrctl & 0xc0000) {
 783                 case DEVSZ_64:  ret = 64 / 8;
 784                 case DEVSZ_128: ret = 128 / 8;
 785                 case DEVSZ_256: ret = 256 / 8;
 786                 case DEVSZ_512: ret = 512 / 8;
 787         }
 788         switch (ddrctl & 0x30000) {
 789                 case DEVWD_4:  ret *= 2;
 790                 case DEVWD_8:  ret *= 2;
 791                 case DEVWD_16: break;
 792         }
 793         if ((ddrctl & 0xc000) == 0x4000)
 794                 ret *= 2;
 795         return ret;
 796 #endif
 797         BUG();
 798 }
 799
 800 void __init setup_arch(char **cmdline_p)
 801 {
 802         unsigned long sclk, cclk;
 803
 804         /* Check to make sure we are running on the right processor */
 805         if (unlikely(CPUID != bfin_cpuid()))
 806                 printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
 807                         CPU, bfin_cpuid(), bfin_revid());
 808
 809 #ifdef CONFIG_DUMMY_CONSOLE
 810         conswitchp = &dummy_con;
 811 #endif
 812
 813 #if defined(CONFIG_CMDLINE_BOOL)
 814         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 815         command_line[sizeof(command_line) - 1] = 0;
 816 #endif
 817
 818         /* Keep a copy of command line */
 819         *cmdline_p = &command_line[0];
 820         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 821         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 822
 823         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 824
 825         /* If the user does not specify things on the command line, use
 826          * what the bootloader set things up as
 827          */
 828         physical_mem_end = 0;
 829         parse_cmdline_early(&command_line[0]);
 830
 831         if (_ramend == 0)
 832                 _ramend = get_mem_size() * 1024 * 1024;
 833
 834         if (physical_mem_end == 0)
 835                 physical_mem_end = _ramend;
 836
 837         memory_setup();
 838
 839         /* Initialize Async memory banks */
 840         bfin_write_EBIU_AMBCTL0(AMBCTL0VAL);
 841         bfin_write_EBIU_AMBCTL1(AMBCTL1VAL);
 842         bfin_write_EBIU_AMGCTL(AMGCTLVAL);
 843 #ifdef CONFIG_EBIU_MBSCTLVAL
 844         bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL);
 845         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
 846         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 847 #endif
 848
 849         cclk = get_cclk();
 850         sclk = get_sclk();
 851
 852         if ((ANOMALY_05000273 || ANOMALY_05000274) && (cclk >> 1) < sclk)
 853                 panic("ANOMALY 05000273 or 05000274: CCLK must be >= 2*SCLK");
 854
 855 #ifdef BF561_FAMILY
 856         if (ANOMALY_05000266) {
 857                 bfin_read_IMDMA_D0_IRQ_STATUS();
 858                 bfin_read_IMDMA_D1_IRQ_STATUS();
 859         }
 860 #endif
 861         printk(KERN_INFO "Hardware Trace ");
 862         if (bfin_read_TBUFCTL() & 0x1)
 863                 printk(KERN_CONT "Active ");
 864         else
 865                 printk(KERN_CONT "Off ");
 866         if (bfin_read_TBUFCTL() & 0x2)
 867                 printk(KERN_CONT "and Enabled\n");
 868         else
 869                 printk(KERN_CONT "and Disabled\n");
 870
 871 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
 872         /* we need to initialize the Flashrom device here since we might
 873          * do things with flash early on in the boot
 874          */
 875         flash_probe();
 876 #endif
 877
 878         printk(KERN_INFO "Boot Mode: %i\n", bfin_read_SYSCR() & 0xF);
 879
 880         /* Newer parts mirror SWRST bits in SYSCR */
 881 #if defined(CONFIG_BF53x) || defined(CONFIG_BF561) || \
 882     defined(CONFIG_BF538) || defined(CONFIG_BF539)
 883         _bfin_swrst = bfin_read_SWRST();
 884 #else
 885         /* Clear boot mode field */
 886         _bfin_swrst = bfin_read_SYSCR() & ~0xf;
 887 #endif
 888
 889 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 890         bfin_write_SWRST(_bfin_swrst & ~DOUBLE_FAULT);
 891 #endif
 892 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
 893         bfin_write_SWRST(_bfin_swrst | DOUBLE_FAULT);
 894 #endif
 895
 896 #ifdef CONFIG_SMP
 897         if (_bfin_swrst & SWRST_DBL_FAULT_A) {
 898 #else
 899         if (_bfin_swrst & RESET_DOUBLE) {
 900 #endif
 901                 printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
 902 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 903                 /* We assume the crashing kernel, and the current symbol table match */
 904                 printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
 905                         (int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
 906                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
 907                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
 908 #endif
 909                 printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
 910                         init_retx);
 911         } else if (_bfin_swrst & RESET_WDOG)
 912                 printk(KERN_INFO "Recovering from Watchdog event\n");
 913         else if (_bfin_swrst & RESET_SOFTWARE)
 914                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 915
 916         printk(KERN_INFO "Blackfin support (C) 2004-2009 Analog Devices, Inc.\n");
 917         if (bfin_compiled_revid() == 0xffff)
 918                 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
 919         else if (bfin_compiled_revid() == -1)
 920                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 921         else
 922                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 923
 924         if (likely(CPUID == bfin_cpuid())) {
 925                 if (bfin_revid() != bfin_compiled_revid()) {
 926                         if (bfin_compiled_revid() == -1)
 927                                 printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 928                                        bfin_revid());
 929                         else if (bfin_compiled_revid() != 0xffff) {
 930                                 printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 931                                        bfin_compiled_revid(), bfin_revid());
 932                                 if (bfin_compiled_revid() > bfin_revid())
 933                                         panic("Error: you are missing anomaly workarounds for this rev");
 934                         }
 935                 }
 936                 if (bfin_revid() < CONFIG_BF_REV_MIN || bfin_revid() > CONFIG_BF_REV_MAX)
 937                         printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 938                                CPU, bfin_revid());
 939         }
 940
 941         /* We can't run on BF548-0.1 due to ANOMALY 05000448 */
 942         if (bfin_cpuid() == 0x27de && bfin_revid() == 1)
 943                 panic("You can't run on this processor due to 05000448");
 944
 945         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 946
 947         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 948                cclk / 1000000, sclk / 1000000);
 949
 950         setup_bootmem_allocator();
 951
 952         paging_init();
 953
 954         /* Copy atomic sequences to their fixed location, and sanity check that
 955            these locations are the ones that we advertise to userspace.  */
 956         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 957                FIXED_CODE_END - FIXED_CODE_START);
 958         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 959                != SIGRETURN_STUB - FIXED_CODE_START);
 960         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 961                != ATOMIC_XCHG32 - FIXED_CODE_START);
 962         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 963                != ATOMIC_CAS32 - FIXED_CODE_START);
 964         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 965                != ATOMIC_ADD32 - FIXED_CODE_START);
 966         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 967                != ATOMIC_SUB32 - FIXED_CODE_START);
 968         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 969                != ATOMIC_IOR32 - FIXED_CODE_START);
 970         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 971                != ATOMIC_AND32 - FIXED_CODE_START);
 972         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 973                != ATOMIC_XOR32 - FIXED_CODE_START);
 974         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 975                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 976
 977 #ifdef CONFIG_SMP
 978         platform_init_cpus();
 979 #endif
 980         init_exception_vectors();
 981         bfin_cache_init();      /* Initialize caches for the boot CPU */
 982 }
 983
 984 static int __init topology_init(void)
 985 {
 986         unsigned int cpu;
 987         /* Record CPU-private information for the boot processor. */
 988         bfin_setup_cpudata(0);
 989
 990         for_each_possible_cpu(cpu) {
 991                 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
 992         }
 993
 994         return 0;
 995 }
 996
 997 subsys_initcall(topology_init);
 998
 999 /* Get the input clock frequency */
1000 static u_long cached_clkin_hz = CONFIG_CLKIN_HZ;
1001 static u_long get_clkin_hz(void)
1002 {
1003         return cached_clkin_hz;
1004 }
1005 static int __init early_init_clkin_hz(char *buf)
1006 {
1007         cached_clkin_hz = simple_strtoul(buf, NULL, 0);
1008 #ifdef BFIN_KERNEL_CLOCK
1009         if (cached_clkin_hz != CONFIG_CLKIN_HZ)
1010                 panic("cannot change clkin_hz when reprogramming clocks");
1011 #endif
1012         return 1;
1013 }
1014 early_param("clkin_hz=", early_init_clkin_hz);
1015
1016 /* Get the voltage input multiplier */
1017 static u_long get_vco(void)
1018 {
1019         static u_long cached_vco;
1020         u_long msel, pll_ctl;
1021
1022         /* The assumption here is that VCO never changes at runtime.
1023          * If, someday, we support that, then we'll have to change this.
1024          */
1025         if (cached_vco)
1026                 return cached_vco;
1027
1028         pll_ctl = bfin_read_PLL_CTL();
1029         msel = (pll_ctl >> 9) & 0x3F;
1030         if (0 == msel)
1031                 msel = 64;
1032
1033         cached_vco = get_clkin_hz();
1034         cached_vco >>= (1 & pll_ctl);   /* DF bit */
1035         cached_vco *= msel;
1036         return cached_vco;
1037 }
1038
1039 /* Get the Core clock */
1040 u_long get_cclk(void)
1041 {
1042         static u_long cached_cclk_pll_div, cached_cclk;
1043         u_long csel, ssel;
1044
1045         if (bfin_read_PLL_STAT() & 0x1)
1046                 return get_clkin_hz();
1047
1048         ssel = bfin_read_PLL_DIV();
1049         if (ssel == cached_cclk_pll_div)
1050                 return cached_cclk;
1051         else
1052                 cached_cclk_pll_div = ssel;
1053
1054         csel = ((ssel >> 4) & 0x03);
1055         ssel &= 0xf;
1056         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
1057                 cached_cclk = get_vco() / ssel;
1058         else
1059                 cached_cclk = get_vco() >> csel;
1060         return cached_cclk;
1061 }
1062 EXPORT_SYMBOL(get_cclk);
1063
1064 /* Get the System clock */
1065 u_long get_sclk(void)
1066 {
1067         static u_long cached_sclk;
1068         u_long ssel;
1069
1070         /* The assumption here is that SCLK never changes at runtime.
1071          * If, someday, we support that, then we'll have to change this.
1072          */
1073         if (cached_sclk)
1074                 return cached_sclk;
1075
1076         if (bfin_read_PLL_STAT() & 0x1)
1077                 return get_clkin_hz();
1078
1079         ssel = bfin_read_PLL_DIV() & 0xf;
1080         if (0 == ssel) {
1081                 printk(KERN_WARNING "Invalid System Clock\n");
1082                 ssel = 1;
1083         }
1084
1085         cached_sclk = get_vco() / ssel;
1086         return cached_sclk;
1087 }
1088 EXPORT_SYMBOL(get_sclk);
1089
1090 unsigned long sclk_to_usecs(unsigned long sclk)
1091 {
1092         u64 tmp = USEC_PER_SEC * (u64)sclk;
1093         do_div(tmp, get_sclk());
1094         return tmp;
1095 }
1096 EXPORT_SYMBOL(sclk_to_usecs);
1097
1098 unsigned long usecs_to_sclk(unsigned long usecs)
1099 {
1100         u64 tmp = get_sclk() * (u64)usecs;
1101         do_div(tmp, USEC_PER_SEC);
1102         return tmp;
1103 }
1104 EXPORT_SYMBOL(usecs_to_sclk);
1105
1106 /*
1107  *      Get CPU information for use by the procfs.
1108  */
1109 static int show_cpuinfo(struct seq_file *m, void *v)
1110 {
1111         char *cpu, *mmu, *fpu, *vendor, *cache;
1112         uint32_t revid;
1113         int cpu_num = *(unsigned int *)v;
1114         u_long sclk, cclk;
1115         u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
1116         struct blackfin_cpudata *cpudata = &per_cpu(cpu_data, cpu_num);
1117
1118         cpu = CPU;
1119         mmu = "none";
1120         fpu = "none";
1121         revid = bfin_revid();
1122
1123         sclk = get_sclk();
1124         cclk = get_cclk();
1125
1126         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
1127         case 0xca:
1128                 vendor = "Analog Devices";
1129                 break;
1130         default:
1131                 vendor = "unknown";
1132                 break;
1133         }
1134
1135         seq_printf(m, "processor\t: %d\n" "vendor_id\t: %s\n", cpu_num, vendor);
1136
1137         if (CPUID == bfin_cpuid())
1138                 seq_printf(m, "cpu family\t: 0x%04x\n", CPUID);
1139         else
1140                 seq_printf(m, "cpu family\t: Compiled for:0x%04x, running on:0x%04x\n",
1141                         CPUID, bfin_cpuid());
1142
1143         seq_printf(m, "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1144                 "stepping\t: %d ",
1145                 cpu, cclk/1000000, sclk/1000000,
1146 #ifdef CONFIG_MPU
1147                 "mpu on",
1148 #else
1149                 "mpu off",
1150 #endif
1151                 revid);
1152
1153         if (bfin_revid() != bfin_compiled_revid()) {
1154                 if (bfin_compiled_revid() == -1)
1155                         seq_printf(m, "(Compiled for Rev none)");
1156                 else if (bfin_compiled_revid() == 0xffff)
1157                         seq_printf(m, "(Compiled for Rev any)");
1158                 else
1159                         seq_printf(m, "(Compiled for Rev %d)", bfin_compiled_revid());
1160         }
1161
1162         seq_printf(m, "\ncpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1163                 cclk/1000000, cclk%1000000,
1164                 sclk/1000000, sclk%1000000);
1165         seq_printf(m, "bogomips\t: %lu.%02lu\n"
1166                 "Calibration\t: %lu loops\n",
1167                 (cpudata->loops_per_jiffy * HZ) / 500000,
1168                 ((cpudata->loops_per_jiffy * HZ) / 5000) % 100,
1169                 (cpudata->loops_per_jiffy * HZ));
1170
1171         /* Check Cache configutation */
1172         switch (cpudata->dmemctl & (1 << DMC0_P | 1 << DMC1_P)) {
1173         case ACACHE_BSRAM:
1174                 cache = "dbank-A/B\t: cache/sram";
1175                 dcache_size = 16;
1176                 dsup_banks = 1;
1177                 break;
1178         case ACACHE_BCACHE:
1179                 cache = "dbank-A/B\t: cache/cache";
1180                 dcache_size = 32;
1181                 dsup_banks = 2;
1182                 break;
1183         case ASRAM_BSRAM:
1184                 cache = "dbank-A/B\t: sram/sram";
1185                 dcache_size = 0;
1186                 dsup_banks = 0;
1187                 break;
1188         default:
1189                 cache = "unknown";
1190                 dcache_size = 0;
1191                 dsup_banks = 0;
1192                 break;
1193         }
1194
1195         /* Is it turned on? */
1196         if ((cpudata->dmemctl & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1197                 dcache_size = 0;
1198
1199         if ((cpudata->imemctl & (IMC | ENICPLB)) != (IMC | ENICPLB))
1200                 icache_size = 0;
1201
1202         seq_printf(m, "cache size\t: %d KB(L1 icache) "
1203                 "%d KB(L1 dcache) %d KB(L2 cache)\n",
1204                 icache_size, dcache_size, 0);
1205         seq_printf(m, "%s\n", cache);
1206         seq_printf(m, "external memory\t: "
1207 #if defined(CONFIG_BFIN_EXTMEM_ICACHEABLE)
1208                    "cacheable"
1209 #else
1210                    "uncacheable"
1211 #endif
1212                    " in instruction cache\n");
1213         seq_printf(m, "external memory\t: "
1214 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK)
1215                       "cacheable (write-back)"
1216 #elif defined(CONFIG_BFIN_EXTMEM_WRITETHROUGH)
1217                       "cacheable (write-through)"
1218 #else
1219                       "uncacheable"
1220 #endif
1221                       " in data cache\n");
1222
1223         if (icache_size)
1224                 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1225                            BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1226         else
1227                 seq_printf(m, "icache setup\t: off\n");
1228
1229         seq_printf(m,
1230                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1231                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1232                    BFIN_DLINES);
1233 #ifdef __ARCH_SYNC_CORE_DCACHE
1234         seq_printf(m, "SMP Dcache Flushes\t: %lu\n\n", cpudata->dcache_invld_count);
1235 #endif
1236 #ifdef __ARCH_SYNC_CORE_ICACHE
1237         seq_printf(m, "SMP Icache Flushes\t: %lu\n\n", cpudata->icache_invld_count);
1238 #endif
1239 #ifdef CONFIG_BFIN_ICACHE_LOCK
1240         switch ((cpudata->imemctl >> 3) & WAYALL_L) {
1241         case WAY0_L:
1242                 seq_printf(m, "Way0 Locked-Down\n");
1243                 break;
1244         case WAY1_L:
1245                 seq_printf(m, "Way1 Locked-Down\n");
1246                 break;
1247         case WAY01_L:
1248                 seq_printf(m, "Way0,Way1 Locked-Down\n");
1249                 break;
1250         case WAY2_L:
1251                 seq_printf(m, "Way2 Locked-Down\n");
1252                 break;
1253         case WAY02_L:
1254                 seq_printf(m, "Way0,Way2 Locked-Down\n");
1255                 break;
1256         case WAY12_L:
1257                 seq_printf(m, "Way1,Way2 Locked-Down\n");
1258                 break;
1259         case WAY012_L:
1260                 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1261                 break;
1262         case WAY3_L:
1263                 seq_printf(m, "Way3 Locked-Down\n");
1264                 break;
1265         case WAY03_L:
1266                 seq_printf(m, "Way0,Way3 Locked-Down\n");
1267                 break;
1268         case WAY13_L:
1269                 seq_printf(m, "Way1,Way3 Locked-Down\n");
1270                 break;
1271         case WAY013_L:
1272                 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1273                 break;
1274         case WAY32_L:
1275                 seq_printf(m, "Way3,Way2 Locked-Down\n");
1276                 break;
1277         case WAY320_L:
1278                 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1279                 break;
1280         case WAY321_L:
1281                 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1282                 break;
1283         case WAYALL_L:
1284                 seq_printf(m, "All Ways are locked\n");
1285                 break;
1286         default:
1287                 seq_printf(m, "No Ways are locked\n");
1288         }
1289 #endif
1290
1291         if (cpu_num != num_possible_cpus() - 1)
1292                 return 0;
1293
1294         if (L2_LENGTH) {
1295                 seq_printf(m, "L2 SRAM\t\t: %dKB\n", L2_LENGTH/0x400);
1296                 seq_printf(m, "L2 SRAM\t\t: "
1297 #if defined(CONFIG_BFIN_L2_ICACHEABLE)
1298                               "cacheable"
1299 #else
1300                               "uncacheable"
1301 #endif
1302                               " in instruction cache\n");
1303                 seq_printf(m, "L2 SRAM\t\t: "
1304 #if defined(CONFIG_BFIN_L2_WRITEBACK)
1305                               "cacheable (write-back)"
1306 #elif defined(CONFIG_BFIN_L2_WRITETHROUGH)
1307                               "cacheable (write-through)"
1308 #else
1309                               "uncacheable"
1310 #endif
1311                               " in data cache\n");
1312         }
1313         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1314         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1315                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1316         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1317                 ((int)memory_end - (int)_stext) >> 10,
1318                 _stext,
1319                 (void *)memory_end);
1320         seq_printf(m, "\n");
1321
1322         return 0;
1323 }
1324
1325 static void *c_start(struct seq_file *m, loff_t *pos)
1326 {
1327         if (*pos == 0)
1328                 *pos = first_cpu(cpu_online_map);
1329         if (*pos >= num_online_cpus())
1330                 return NULL;
1331
1332         return pos;
1333 }
1334
1335 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1336 {
1337         *pos = next_cpu(*pos, cpu_online_map);
1338
1339         return c_start(m, pos);
1340 }
1341
1342 static void c_stop(struct seq_file *m, void *v)
1343 {
1344 }
1345
1346 const struct seq_operations cpuinfo_op = {
1347         .start = c_start,
1348         .next = c_next,
1349         .stop = c_stop,
1350         .show = show_cpuinfo,
1351 };
1352
1353 void __init cmdline_init(const char *r0)
1354 {
1355         if (r0)
1356                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1357 }