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