include/linux/mtd/map.h

   1
   2 /* Overhauled routines for dealing with different mmap regions of flash */
   3
   4 #ifndef __LINUX_MTD_MAP_H__
   5 #define __LINUX_MTD_MAP_H__
   6
   7 #include <linux/types.h>
   8 #include <linux/list.h>
   9 #include <linux/string.h>
  10 #include <linux/bug.h>
  11
  12 #include <linux/mtd/compatmac.h>
  13
  14 #include <asm/unaligned.h>
  15 #include <asm/system.h>
  16 #include <asm/io.h>
  17
  18 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
  19 #define map_bankwidth(map) 1
  20 #define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
  21 #define map_bankwidth_is_large(map) (0)
  22 #define map_words(map) (1)
  23 #define MAX_MAP_BANKWIDTH 1
  24 #else
  25 #define map_bankwidth_is_1(map) (0)
  26 #endif
  27
  28 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
  29 # ifdef map_bankwidth
  30 #  undef map_bankwidth
  31 #  define map_bankwidth(map) ((map)->bankwidth)
  32 # else
  33 #  define map_bankwidth(map) 2
  34 #  define map_bankwidth_is_large(map) (0)
  35 #  define map_words(map) (1)
  36 # endif
  37 #define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
  38 #undef MAX_MAP_BANKWIDTH
  39 #define MAX_MAP_BANKWIDTH 2
  40 #else
  41 #define map_bankwidth_is_2(map) (0)
  42 #endif
  43
  44 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
  45 # ifdef map_bankwidth
  46 #  undef map_bankwidth
  47 #  define map_bankwidth(map) ((map)->bankwidth)
  48 # else
  49 #  define map_bankwidth(map) 4
  50 #  define map_bankwidth_is_large(map) (0)
  51 #  define map_words(map) (1)
  52 # endif
  53 #define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
  54 #undef MAX_MAP_BANKWIDTH
  55 #define MAX_MAP_BANKWIDTH 4
  56 #else
  57 #define map_bankwidth_is_4(map) (0)
  58 #endif
  59
  60 /* ensure we never evaluate anything shorted than an unsigned long
  61  * to zero, and ensure we'll never miss the end of an comparison (bjd) */
  62
  63 #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
  64
  65 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
  66 # ifdef map_bankwidth
  67 #  undef map_bankwidth
  68 #  define map_bankwidth(map) ((map)->bankwidth)
  69 #  if BITS_PER_LONG < 64
  70 #   undef map_bankwidth_is_large
  71 #   define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
  72 #   undef map_words
  73 #   define map_words(map) map_calc_words(map)
  74 #  endif
  75 # else
  76 #  define map_bankwidth(map) 8
  77 #  define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
  78 #  define map_words(map) map_calc_words(map)
  79 # endif
  80 #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
  81 #undef MAX_MAP_BANKWIDTH
  82 #define MAX_MAP_BANKWIDTH 8
  83 #else
  84 #define map_bankwidth_is_8(map) (0)
  85 #endif
  86
  87 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
  88 # ifdef map_bankwidth
  89 #  undef map_bankwidth
  90 #  define map_bankwidth(map) ((map)->bankwidth)
  91 #  undef map_bankwidth_is_large
  92 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
  93 #  undef map_words
  94 #  define map_words(map) map_calc_words(map)
  95 # else
  96 #  define map_bankwidth(map) 16
  97 #  define map_bankwidth_is_large(map) (1)
  98 #  define map_words(map) map_calc_words(map)
  99 # endif
 100 #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
 101 #undef MAX_MAP_BANKWIDTH
 102 #define MAX_MAP_BANKWIDTH 16
 103 #else
 104 #define map_bankwidth_is_16(map) (0)
 105 #endif
 106
 107 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
 108 # ifdef map_bankwidth
 109 #  undef map_bankwidth
 110 #  define map_bankwidth(map) ((map)->bankwidth)
 111 #  undef map_bankwidth_is_large
 112 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
 113 #  undef map_words
 114 #  define map_words(map) map_calc_words(map)
 115 # else
 116 #  define map_bankwidth(map) 32
 117 #  define map_bankwidth_is_large(map) (1)
 118 #  define map_words(map) map_calc_words(map)
 119 # endif
 120 #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
 121 #undef MAX_MAP_BANKWIDTH
 122 #define MAX_MAP_BANKWIDTH 32
 123 #else
 124 #define map_bankwidth_is_32(map) (0)
 125 #endif
 126
 127 #ifndef map_bankwidth
 128 #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
 129 static inline int map_bankwidth(void *map)
 130 {
 131         BUG();
 132         return 0;
 133 }
 134 #define map_bankwidth_is_large(map) (0)
 135 #define map_words(map) (0)
 136 #define MAX_MAP_BANKWIDTH 1
 137 #endif
 138
 139 static inline int map_bankwidth_supported(int w)
 140 {
 141         switch (w) {
 142 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
 143         case 1:
 144 #endif
 145 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
 146         case 2:
 147 #endif
 148 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
 149         case 4:
 150 #endif
 151 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
 152         case 8:
 153 #endif
 154 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
 155         case 16:
 156 #endif
 157 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
 158         case 32:
 159 #endif
 160                 return 1;
 161
 162         default:
 163                 return 0;
 164         }
 165 }
 166
 167 #define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
 168
 169 typedef union {
 170         unsigned long x[MAX_MAP_LONGS];
 171 } map_word;
 172
 173 /* The map stuff is very simple. You fill in your struct map_info with
 174    a handful of routines for accessing the device, making sure they handle
 175    paging etc. correctly if your device needs it. Then you pass it off
 176    to a chip probe routine -- either JEDEC or CFI probe or both -- via
 177    do_map_probe(). If a chip is recognised, the probe code will invoke the
 178    appropriate chip driver (if present) and return a struct mtd_info.
 179    At which point, you fill in the mtd->module with your own module
 180    address, and register it with the MTD core code. Or you could partition
 181    it and register the partitions instead, or keep it for your own private
 182    use; whatever.
 183
 184    The mtd->priv field will point to the struct map_info, and any further
 185    private data required by the chip driver is linked from the
 186    mtd->priv->fldrv_priv field. This allows the map driver to get at
 187    the destructor function map->fldrv_destroy() when it's tired
 188    of living.
 189 */
 190
 191 struct map_info {
 192         const char *name;
 193         unsigned long size;
 194         resource_size_t phys;
 195 #define NO_XIP (-1UL)
 196
 197         void __iomem *virt;
 198         void *cached;
 199
 200         int bankwidth; /* in octets. This isn't necessarily the width
 201                        of actual bus cycles -- it's the repeat interval
 202                       in bytes, before you are talking to the first chip again.
 203                       */
 204
 205 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
 206         map_word (*read)(struct map_info *, unsigned long);
 207         void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
 208
 209         void (*write)(struct map_info *, const map_word, unsigned long);
 210         void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
 211
 212         /* We can perhaps put in 'point' and 'unpoint' methods, if we really
 213            want to enable XIP for non-linear mappings. Not yet though. */
 214 #endif
 215         /* It's possible for the map driver to use cached memory in its
 216            copy_from implementation (and _only_ with copy_from).  However,
 217            when the chip driver knows some flash area has changed contents,
 218            it will signal it to the map driver through this routine to let
 219            the map driver invalidate the corresponding cache as needed.
 220            If there is no cache to care about this can be set to NULL. */
 221         void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
 222
 223         /* set_vpp() must handle being reentered -- enable, enable, disable
 224            must leave it enabled. */
 225         void (*set_vpp)(struct map_info *, int);
 226
 227         unsigned long pfow_base;
 228         unsigned long map_priv_1;
 229         unsigned long map_priv_2;
 230         void *fldrv_priv;
 231         struct mtd_chip_driver *fldrv;
 232 };
 233
 234 struct mtd_chip_driver {
 235         struct mtd_info *(*probe)(struct map_info *map);
 236         void (*destroy)(struct mtd_info *);
 237         struct module *module;
 238         char *name;
 239         struct list_head list;
 240 };
 241
 242 void register_mtd_chip_driver(struct mtd_chip_driver *);
 243 void unregister_mtd_chip_driver(struct mtd_chip_driver *);
 244
 245 struct mtd_info *do_map_probe(const char *name, struct map_info *map);
 246 void map_destroy(struct mtd_info *mtd);
 247
 248 #define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0)
 249 #define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0)
 250
 251 #define INVALIDATE_CACHED_RANGE(map, from, size) \
 252         do { if(map->inval_cache) map->inval_cache(map, from, size); } while(0)
 253
 254
 255 static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
 256 {
 257         int i;
 258         for (i=0; i<map_words(map); i++) {
 259                 if (val1.x[i] != val2.x[i])
 260                         return 0;
 261         }
 262         return 1;
 263 }
 264
 265 static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
 266 {
 267         map_word r;
 268         int i;
 269
 270         for (i=0; i<map_words(map); i++) {
 271                 r.x[i] = val1.x[i] & val2.x[i];
 272         }
 273         return r;
 274 }
 275
 276 static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
 277 {
 278         map_word r;
 279         int i;
 280
 281         for (i=0; i<map_words(map); i++) {
 282                 r.x[i] = val1.x[i] & ~val2.x[i];
 283         }
 284         return r;
 285 }
 286
 287 static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
 288 {
 289         map_word r;
 290         int i;
 291
 292         for (i=0; i<map_words(map); i++) {
 293                 r.x[i] = val1.x[i] | val2.x[i];
 294         }
 295         return r;
 296 }
 297
 298 #define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b))
 299
 300 static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
 301 {
 302         int i;
 303
 304         for (i=0; i<map_words(map); i++) {
 305                 if (val1.x[i] & val2.x[i])
 306                         return 1;
 307         }
 308         return 0;
 309 }
 310
 311 static inline map_word map_word_load(struct map_info *map, const void *ptr)
 312 {
 313         map_word r;
 314
 315         if (map_bankwidth_is_1(map))
 316                 r.x[0] = *(unsigned char *)ptr;
 317         else if (map_bankwidth_is_2(map))
 318                 r.x[0] = get_unaligned((uint16_t *)ptr);
 319         else if (map_bankwidth_is_4(map))
 320                 r.x[0] = get_unaligned((uint32_t *)ptr);
 321 #if BITS_PER_LONG >= 64
 322         else if (map_bankwidth_is_8(map))
 323                 r.x[0] = get_unaligned((uint64_t *)ptr);
 324 #endif
 325         else if (map_bankwidth_is_large(map))
 326                 memcpy(r.x, ptr, map->bankwidth);
 327
 328         return r;
 329 }
 330
 331 static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
 332 {
 333         int i;
 334
 335         if (map_bankwidth_is_large(map)) {
 336                 char *dest = (char *)&orig;
 337                 memcpy(dest+start, buf, len);
 338         } else {
 339                 for (i=start; i < start+len; i++) {
 340                         int bitpos;
 341 #ifdef __LITTLE_ENDIAN
 342                         bitpos = i*8;
 343 #else /* __BIG_ENDIAN */
 344                         bitpos = (map_bankwidth(map)-1-i)*8;
 345 #endif
 346                         orig.x[0] &= ~(0xff << bitpos);
 347                         orig.x[0] |= buf[i-start] << bitpos;
 348                 }
 349         }
 350         return orig;
 351 }
 352
 353 #if BITS_PER_LONG < 64
 354 #define MAP_FF_LIMIT 4
 355 #else
 356 #define MAP_FF_LIMIT 8
 357 #endif
 358
 359 static inline map_word map_word_ff(struct map_info *map)
 360 {
 361         map_word r;
 362         int i;
 363
 364         if (map_bankwidth(map) < MAP_FF_LIMIT) {
 365                 int bw = 8 * map_bankwidth(map);
 366                 r.x[0] = (1 << bw) - 1;
 367         } else {
 368                 for (i=0; i<map_words(map); i++)
 369                         r.x[i] = ~0UL;
 370         }
 371         return r;
 372 }
 373
 374 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
 375 {
 376         map_word r;
 377
 378         if (map_bankwidth_is_1(map))
 379                 r.x[0] = __raw_readb(map->virt + ofs);
 380         else if (map_bankwidth_is_2(map))
 381                 r.x[0] = __raw_readw(map->virt + ofs);
 382         else if (map_bankwidth_is_4(map))
 383                 r.x[0] = __raw_readl(map->virt + ofs);
 384 #if BITS_PER_LONG >= 64
 385         else if (map_bankwidth_is_8(map))
 386                 r.x[0] = __raw_readq(map->virt + ofs);
 387 #endif
 388         else if (map_bankwidth_is_large(map))
 389                 memcpy_fromio(r.x, map->virt+ofs, map->bankwidth);
 390         else
 391                 BUG();
 392
 393         return r;
 394 }
 395
 396 static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
 397 {
 398         if (map_bankwidth_is_1(map))
 399                 __raw_writeb(datum.x[0], map->virt + ofs);
 400         else if (map_bankwidth_is_2(map))
 401                 __raw_writew(datum.x[0], map->virt + ofs);
 402         else if (map_bankwidth_is_4(map))
 403                 __raw_writel(datum.x[0], map->virt + ofs);
 404 #if BITS_PER_LONG >= 64
 405         else if (map_bankwidth_is_8(map))
 406                 __raw_writeq(datum.x[0], map->virt + ofs);
 407 #endif
 408         else if (map_bankwidth_is_large(map))
 409                 memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
 410         mb();
 411 }
 412
 413 static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 414 {
 415         if (map->cached)
 416                 memcpy(to, (char *)map->cached + from, len);
 417         else
 418                 memcpy_fromio(to, map->virt + from, len);
 419 }
 420
 421 static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 422 {
 423         memcpy_toio(map->virt + to, from, len);
 424 }
 425
 426 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
 427 #define map_read(map, ofs) (map)->read(map, ofs)
 428 #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
 429 #define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
 430 #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
 431
 432 extern void simple_map_init(struct map_info *);
 433 #define map_is_linear(map) (map->phys != NO_XIP)
 434
 435 #else
 436 #define map_read(map, ofs) inline_map_read(map, ofs)
 437 #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
 438 #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
 439 #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
 440
 441
 442 #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
 443 #define map_is_linear(map) ({ (void)(map); 1; })
 444
 445 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
 446
 447 #endif /* __LINUX_MTD_MAP_H__ */