include/linux/mtd/map.h

   1 /*
   2  * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  *
  18  */
  19
  20 /* Overhauled routines for dealing with different mmap regions of flash */
  21
  22 #ifndef __LINUX_MTD_MAP_H__
  23 #define __LINUX_MTD_MAP_H__
  24
  25 #include <linux/types.h>
  26 #include <linux/list.h>
  27 #include <linux/string.h>
  28 #include <linux/bug.h>
  29
  30
  31 #include <asm/unaligned.h>
  32 #include <asm/system.h>
  33 #include <asm/io.h>
  34
  35 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
  36 #define map_bankwidth(map) 1
  37 #define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
  38 #define map_bankwidth_is_large(map) (0)
  39 #define map_words(map) (1)
  40 #define MAX_MAP_BANKWIDTH 1
  41 #else
  42 #define map_bankwidth_is_1(map) (0)
  43 #endif
  44
  45 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
  46 # ifdef map_bankwidth
  47 #  undef map_bankwidth
  48 #  define map_bankwidth(map) ((map)->bankwidth)
  49 # else
  50 #  define map_bankwidth(map) 2
  51 #  define map_bankwidth_is_large(map) (0)
  52 #  define map_words(map) (1)
  53 # endif
  54 #define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
  55 #undef MAX_MAP_BANKWIDTH
  56 #define MAX_MAP_BANKWIDTH 2
  57 #else
  58 #define map_bankwidth_is_2(map) (0)
  59 #endif
  60
  61 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
  62 # ifdef map_bankwidth
  63 #  undef map_bankwidth
  64 #  define map_bankwidth(map) ((map)->bankwidth)
  65 # else
  66 #  define map_bankwidth(map) 4
  67 #  define map_bankwidth_is_large(map) (0)
  68 #  define map_words(map) (1)
  69 # endif
  70 #define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
  71 #undef MAX_MAP_BANKWIDTH
  72 #define MAX_MAP_BANKWIDTH 4
  73 #else
  74 #define map_bankwidth_is_4(map) (0)
  75 #endif
  76
  77 /* ensure we never evaluate anything shorted than an unsigned long
  78  * to zero, and ensure we'll never miss the end of an comparison (bjd) */
  79
  80 #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
  81
  82 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
  83 # ifdef map_bankwidth
  84 #  undef map_bankwidth
  85 #  define map_bankwidth(map) ((map)->bankwidth)
  86 #  if BITS_PER_LONG < 64
  87 #   undef map_bankwidth_is_large
  88 #   define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
  89 #   undef map_words
  90 #   define map_words(map) map_calc_words(map)
  91 #  endif
  92 # else
  93 #  define map_bankwidth(map) 8
  94 #  define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
  95 #  define map_words(map) map_calc_words(map)
  96 # endif
  97 #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
  98 #undef MAX_MAP_BANKWIDTH
  99 #define MAX_MAP_BANKWIDTH 8
 100 #else
 101 #define map_bankwidth_is_8(map) (0)
 102 #endif
 103
 104 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
 105 # ifdef map_bankwidth
 106 #  undef map_bankwidth
 107 #  define map_bankwidth(map) ((map)->bankwidth)
 108 #  undef map_bankwidth_is_large
 109 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
 110 #  undef map_words
 111 #  define map_words(map) map_calc_words(map)
 112 # else
 113 #  define map_bankwidth(map) 16
 114 #  define map_bankwidth_is_large(map) (1)
 115 #  define map_words(map) map_calc_words(map)
 116 # endif
 117 #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
 118 #undef MAX_MAP_BANKWIDTH
 119 #define MAX_MAP_BANKWIDTH 16
 120 #else
 121 #define map_bankwidth_is_16(map) (0)
 122 #endif
 123
 124 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
 125 # ifdef map_bankwidth
 126 #  undef map_bankwidth
 127 #  define map_bankwidth(map) ((map)->bankwidth)
 128 #  undef map_bankwidth_is_large
 129 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
 130 #  undef map_words
 131 #  define map_words(map) map_calc_words(map)
 132 # else
 133 #  define map_bankwidth(map) 32
 134 #  define map_bankwidth_is_large(map) (1)
 135 #  define map_words(map) map_calc_words(map)
 136 # endif
 137 #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
 138 #undef MAX_MAP_BANKWIDTH
 139 #define MAX_MAP_BANKWIDTH 32
 140 #else
 141 #define map_bankwidth_is_32(map) (0)
 142 #endif
 143
 144 #ifndef map_bankwidth
 145 #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
 146 static inline int map_bankwidth(void *map)
 147 {
 148         BUG();
 149         return 0;
 150 }
 151 #define map_bankwidth_is_large(map) (0)
 152 #define map_words(map) (0)
 153 #define MAX_MAP_BANKWIDTH 1
 154 #endif
 155
 156 static inline int map_bankwidth_supported(int w)
 157 {
 158         switch (w) {
 159 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
 160         case 1:
 161 #endif
 162 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
 163         case 2:
 164 #endif
 165 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
 166         case 4:
 167 #endif
 168 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
 169         case 8:
 170 #endif
 171 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
 172         case 16:
 173 #endif
 174 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
 175         case 32:
 176 #endif
 177                 return 1;
 178
 179         default:
 180                 return 0;
 181         }
 182 }
 183
 184 #define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
 185
 186 typedef union {
 187         unsigned long x[MAX_MAP_LONGS];
 188 } map_word;
 189
 190 /* The map stuff is very simple. You fill in your struct map_info with
 191    a handful of routines for accessing the device, making sure they handle
 192    paging etc. correctly if your device needs it. Then you pass it off
 193    to a chip probe routine -- either JEDEC or CFI probe or both -- via
 194    do_map_probe(). If a chip is recognised, the probe code will invoke the
 195    appropriate chip driver (if present) and return a struct mtd_info.
 196    At which point, you fill in the mtd->module with your own module
 197    address, and register it with the MTD core code. Or you could partition
 198    it and register the partitions instead, or keep it for your own private
 199    use; whatever.
 200
 201    The mtd->priv field will point to the struct map_info, and any further
 202    private data required by the chip driver is linked from the
 203    mtd->priv->fldrv_priv field. This allows the map driver to get at
 204    the destructor function map->fldrv_destroy() when it's tired
 205    of living.
 206 */
 207
 208 struct map_info {
 209         const char *name;
 210         unsigned long size;
 211         resource_size_t phys;
 212 #define NO_XIP (-1UL)
 213
 214         void __iomem *virt;
 215         void *cached;
 216
 217         int bankwidth; /* in octets. This isn't necessarily the width
 218                        of actual bus cycles -- it's the repeat interval
 219                       in bytes, before you are talking to the first chip again.
 220                       */
 221
 222 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
 223         map_word (*read)(struct map_info *, unsigned long);
 224         void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
 225
 226         void (*write)(struct map_info *, const map_word, unsigned long);
 227         void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
 228
 229         /* We can perhaps put in 'point' and 'unpoint' methods, if we really
 230            want to enable XIP for non-linear mappings. Not yet though. */
 231 #endif
 232         /* It's possible for the map driver to use cached memory in its
 233            copy_from implementation (and _only_ with copy_from).  However,
 234            when the chip driver knows some flash area has changed contents,
 235            it will signal it to the map driver through this routine to let
 236            the map driver invalidate the corresponding cache as needed.
 237            If there is no cache to care about this can be set to NULL. */
 238         void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
 239
 240         /* set_vpp() must handle being reentered -- enable, enable, disable
 241            must leave it enabled. */
 242         void (*set_vpp)(struct map_info *, int);
 243
 244         unsigned long pfow_base;
 245         unsigned long map_priv_1;
 246         unsigned long map_priv_2;
 247         void *fldrv_priv;
 248         struct mtd_chip_driver *fldrv;
 249 };
 250
 251 struct mtd_chip_driver {
 252         struct mtd_info *(*probe)(struct map_info *map);
 253         void (*destroy)(struct mtd_info *);
 254         struct module *module;
 255         char *name;
 256         struct list_head list;
 257 };
 258
 259 void register_mtd_chip_driver(struct mtd_chip_driver *);
 260 void unregister_mtd_chip_driver(struct mtd_chip_driver *);
 261
 262 struct mtd_info *do_map_probe(const char *name, struct map_info *map);
 263 void map_destroy(struct mtd_info *mtd);
 264
 265 #define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0)
 266 #define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0)
 267
 268 #define INVALIDATE_CACHED_RANGE(map, from, size) \
 269         do { if(map->inval_cache) map->inval_cache(map, from, size); } while(0)
 270
 271
 272 static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
 273 {
 274         int i;
 275         for (i=0; i<map_words(map); i++) {
 276                 if (val1.x[i] != val2.x[i])
 277                         return 0;
 278         }
 279         return 1;
 280 }
 281
 282 static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
 283 {
 284         map_word r;
 285         int i;
 286
 287         for (i=0; i<map_words(map); i++) {
 288                 r.x[i] = val1.x[i] & val2.x[i];
 289         }
 290         return r;
 291 }
 292
 293 static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
 294 {
 295         map_word r;
 296         int i;
 297
 298         for (i=0; i<map_words(map); i++) {
 299                 r.x[i] = val1.x[i] & ~val2.x[i];
 300         }
 301         return r;
 302 }
 303
 304 static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
 305 {
 306         map_word r;
 307         int i;
 308
 309         for (i=0; i<map_words(map); i++) {
 310                 r.x[i] = val1.x[i] | val2.x[i];
 311         }
 312         return r;
 313 }
 314
 315 #define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b))
 316
 317 static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
 318 {
 319         int i;
 320
 321         for (i=0; i<map_words(map); i++) {
 322                 if (val1.x[i] & val2.x[i])
 323                         return 1;
 324         }
 325         return 0;
 326 }
 327
 328 static inline map_word map_word_load(struct map_info *map, const void *ptr)
 329 {
 330         map_word r;
 331
 332         if (map_bankwidth_is_1(map))
 333                 r.x[0] = *(unsigned char *)ptr;
 334         else if (map_bankwidth_is_2(map))
 335                 r.x[0] = get_unaligned((uint16_t *)ptr);
 336         else if (map_bankwidth_is_4(map))
 337                 r.x[0] = get_unaligned((uint32_t *)ptr);
 338 #if BITS_PER_LONG >= 64
 339         else if (map_bankwidth_is_8(map))
 340                 r.x[0] = get_unaligned((uint64_t *)ptr);
 341 #endif
 342         else if (map_bankwidth_is_large(map))
 343                 memcpy(r.x, ptr, map->bankwidth);
 344
 345         return r;
 346 }
 347
 348 static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
 349 {
 350         int i;
 351
 352         if (map_bankwidth_is_large(map)) {
 353                 char *dest = (char *)&orig;
 354                 memcpy(dest+start, buf, len);
 355         } else {
 356                 for (i=start; i < start+len; i++) {
 357                         int bitpos;
 358 #ifdef __LITTLE_ENDIAN
 359                         bitpos = i*8;
 360 #else /* __BIG_ENDIAN */
 361                         bitpos = (map_bankwidth(map)-1-i)*8;
 362 #endif
 363                         orig.x[0] &= ~(0xff << bitpos);
 364                         orig.x[0] |= buf[i-start] << bitpos;
 365                 }
 366         }
 367         return orig;
 368 }
 369
 370 #if BITS_PER_LONG < 64
 371 #define MAP_FF_LIMIT 4
 372 #else
 373 #define MAP_FF_LIMIT 8
 374 #endif
 375
 376 static inline map_word map_word_ff(struct map_info *map)
 377 {
 378         map_word r;
 379         int i;
 380
 381         if (map_bankwidth(map) < MAP_FF_LIMIT) {
 382                 int bw = 8 * map_bankwidth(map);
 383                 r.x[0] = (1 << bw) - 1;
 384         } else {
 385                 for (i=0; i<map_words(map); i++)
 386                         r.x[i] = ~0UL;
 387         }
 388         return r;
 389 }
 390
 391 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
 392 {
 393         map_word r;
 394
 395         if (map_bankwidth_is_1(map))
 396                 r.x[0] = __raw_readb(map->virt + ofs);
 397         else if (map_bankwidth_is_2(map))
 398                 r.x[0] = __raw_readw(map->virt + ofs);
 399         else if (map_bankwidth_is_4(map))
 400                 r.x[0] = __raw_readl(map->virt + ofs);
 401 #if BITS_PER_LONG >= 64
 402         else if (map_bankwidth_is_8(map))
 403                 r.x[0] = __raw_readq(map->virt + ofs);
 404 #endif
 405         else if (map_bankwidth_is_large(map))
 406                 memcpy_fromio(r.x, map->virt+ofs, map->bankwidth);
 407         else
 408                 BUG();
 409
 410         return r;
 411 }
 412
 413 static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
 414 {
 415         if (map_bankwidth_is_1(map))
 416                 __raw_writeb(datum.x[0], map->virt + ofs);
 417         else if (map_bankwidth_is_2(map))
 418                 __raw_writew(datum.x[0], map->virt + ofs);
 419         else if (map_bankwidth_is_4(map))
 420                 __raw_writel(datum.x[0], map->virt + ofs);
 421 #if BITS_PER_LONG >= 64
 422         else if (map_bankwidth_is_8(map))
 423                 __raw_writeq(datum.x[0], map->virt + ofs);
 424 #endif
 425         else if (map_bankwidth_is_large(map))
 426                 memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
 427         mb();
 428 }
 429
 430 static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 431 {
 432         if (map->cached)
 433                 memcpy(to, (char *)map->cached + from, len);
 434         else
 435                 memcpy_fromio(to, map->virt + from, len);
 436 }
 437
 438 static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 439 {
 440         memcpy_toio(map->virt + to, from, len);
 441 }
 442
 443 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
 444 #define map_read(map, ofs) (map)->read(map, ofs)
 445 #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
 446 #define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
 447 #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
 448
 449 extern void simple_map_init(struct map_info *);
 450 #define map_is_linear(map) (map->phys != NO_XIP)
 451
 452 #else
 453 #define map_read(map, ofs) inline_map_read(map, ofs)
 454 #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
 455 #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
 456 #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
 457
 458
 459 #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
 460 #define map_is_linear(map) ({ (void)(map); 1; })
 461
 462 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
 463
 464 #endif /* __LINUX_MTD_MAP_H__ */