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 #include <linux/kernel.h> 30 31 #include <asm/unaligned.h> 32 #include <asm/io.h> 33 #include <asm/barrier.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 swap; /* this mapping's byte-swapping requirement */ 218 int bankwidth; /* in octets. This isn't necessarily the width 219 of actual bus cycles -- it's the repeat interval 220 in bytes, before you are talking to the first chip again. 221 */ 222 223 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS 224 map_word (*read)(struct map_info *, unsigned long); 225 void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t); 226 227 void (*write)(struct map_info *, const map_word, unsigned long); 228 void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t); 229 230 /* We can perhaps put in 'point' and 'unpoint' methods, if we really 231 want to enable XIP for non-linear mappings. Not yet though. */ 232 #endif 233 /* It's possible for the map driver to use cached memory in its 234 copy_from implementation (and _only_ with copy_from). However, 235 when the chip driver knows some flash area has changed contents, 236 it will signal it to the map driver through this routine to let 237 the map driver invalidate the corresponding cache as needed. 238 If there is no cache to care about this can be set to NULL. */ 239 void (*inval_cache)(struct map_info *, unsigned long, ssize_t); 240 241 /* set_vpp() must handle being reentered -- enable, enable, disable 242 must leave it enabled. */ 243 void (*set_vpp)(struct map_info *, int); 244 245 unsigned long pfow_base; 246 unsigned long map_priv_1; 247 unsigned long map_priv_2; 248 struct device_node *device_node; 249 void *fldrv_priv; 250 struct mtd_chip_driver *fldrv; 251 }; 252 253 struct mtd_chip_driver { 254 struct mtd_info *(*probe)(struct map_info *map); 255 void (*destroy)(struct mtd_info *); 256 struct module *module; 257 char *name; 258 struct list_head list; 259 }; 260 261 void register_mtd_chip_driver(struct mtd_chip_driver *); 262 void unregister_mtd_chip_driver(struct mtd_chip_driver *); 263 264 struct mtd_info *do_map_probe(const char *name, struct map_info *map); 265 void map_destroy(struct mtd_info *mtd); 266 267 #define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0) 268 #define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0) 269 270 #define INVALIDATE_CACHED_RANGE(map, from, size) \ 271 do { if(map->inval_cache) map->inval_cache(map, from, size); } while(0) 272 273 274 static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2) 275 { 276 int i; 277 for (i=0; i<map_words(map); i++) { 278 if (val1.x[i] != val2.x[i]) 279 return 0; 280 } 281 return 1; 282 } 283 284 static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2) 285 { 286 map_word r; 287 int i; 288 289 for (i=0; i<map_words(map); i++) { 290 r.x[i] = val1.x[i] & val2.x[i]; 291 } 292 return r; 293 } 294 295 static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2) 296 { 297 map_word r; 298 int i; 299 300 for (i=0; i<map_words(map); i++) { 301 r.x[i] = val1.x[i] & ~val2.x[i]; 302 } 303 return r; 304 } 305 306 static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2) 307 { 308 map_word r; 309 int i; 310 311 for (i=0; i<map_words(map); i++) { 312 r.x[i] = val1.x[i] | val2.x[i]; 313 } 314 return r; 315 } 316 317 #define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b)) 318 319 static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2) 320 { 321 int i; 322 323 for (i=0; i<map_words(map); i++) { 324 if (val1.x[i] & val2.x[i]) 325 return 1; 326 } 327 return 0; 328 } 329 330 static inline map_word map_word_load(struct map_info *map, const void *ptr) 331 { 332 map_word r; 333 334 if (map_bankwidth_is_1(map)) 335 r.x[0] = *(unsigned char *)ptr; 336 else if (map_bankwidth_is_2(map)) 337 r.x[0] = get_unaligned((uint16_t *)ptr); 338 else if (map_bankwidth_is_4(map)) 339 r.x[0] = get_unaligned((uint32_t *)ptr); 340 #if BITS_PER_LONG >= 64 341 else if (map_bankwidth_is_8(map)) 342 r.x[0] = get_unaligned((uint64_t *)ptr); 343 #endif 344 else if (map_bankwidth_is_large(map)) 345 memcpy(r.x, ptr, map->bankwidth); 346 else 347 BUG(); 348 349 return r; 350 } 351 352 static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len) 353 { 354 int i; 355 356 if (map_bankwidth_is_large(map)) { 357 char *dest = (char *)&orig; 358 memcpy(dest+start, buf, len); 359 } else { 360 for (i=start; i < start+len; i++) { 361 int bitpos; 362 #ifdef __LITTLE_ENDIAN 363 bitpos = i*8; 364 #else /* __BIG_ENDIAN */ 365 bitpos = (map_bankwidth(map)-1-i)*8; 366 #endif 367 orig.x[0] &= ~(0xff << bitpos); 368 orig.x[0] |= (unsigned long)buf[i-start] << bitpos; 369 } 370 } 371 return orig; 372 } 373 374 #if BITS_PER_LONG < 64 375 #define MAP_FF_LIMIT 4 376 #else 377 #define MAP_FF_LIMIT 8 378 #endif 379 380 static inline map_word map_word_ff(struct map_info *map) 381 { 382 map_word r; 383 int i; 384 385 if (map_bankwidth(map) < MAP_FF_LIMIT) { 386 int bw = 8 * map_bankwidth(map); 387 r.x[0] = (1UL << bw) - 1; 388 } else { 389 for (i=0; i<map_words(map); i++) 390 r.x[i] = ~0UL; 391 } 392 return r; 393 } 394 395 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs) 396 { 397 map_word r; 398 399 if (map_bankwidth_is_1(map)) 400 r.x[0] = __raw_readb(map->virt + ofs); 401 else if (map_bankwidth_is_2(map)) 402 r.x[0] = __raw_readw(map->virt + ofs); 403 else if (map_bankwidth_is_4(map)) 404 r.x[0] = __raw_readl(map->virt + ofs); 405 #if BITS_PER_LONG >= 64 406 else if (map_bankwidth_is_8(map)) 407 r.x[0] = __raw_readq(map->virt + ofs); 408 #endif 409 else if (map_bankwidth_is_large(map)) 410 memcpy_fromio(r.x, map->virt+ofs, map->bankwidth); 411 else 412 BUG(); 413 414 return r; 415 } 416 417 static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs) 418 { 419 if (map_bankwidth_is_1(map)) 420 __raw_writeb(datum.x[0], map->virt + ofs); 421 else if (map_bankwidth_is_2(map)) 422 __raw_writew(datum.x[0], map->virt + ofs); 423 else if (map_bankwidth_is_4(map)) 424 __raw_writel(datum.x[0], map->virt + ofs); 425 #if BITS_PER_LONG >= 64 426 else if (map_bankwidth_is_8(map)) 427 __raw_writeq(datum.x[0], map->virt + ofs); 428 #endif 429 else if (map_bankwidth_is_large(map)) 430 memcpy_toio(map->virt+ofs, datum.x, map->bankwidth); 431 else 432 BUG(); 433 mb(); 434 } 435 436 static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) 437 { 438 if (map->cached) 439 memcpy(to, (char *)map->cached + from, len); 440 else 441 memcpy_fromio(to, map->virt + from, len); 442 } 443 444 static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) 445 { 446 memcpy_toio(map->virt + to, from, len); 447 } 448 449 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS 450 #define map_read(map, ofs) (map)->read(map, ofs) 451 #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len) 452 #define map_write(map, datum, ofs) (map)->write(map, datum, ofs) 453 #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len) 454 455 extern void simple_map_init(struct map_info *); 456 #define map_is_linear(map) (map->phys != NO_XIP) 457 458 #else 459 #define map_read(map, ofs) inline_map_read(map, ofs) 460 #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len) 461 #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs) 462 #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len) 463 464 465 #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth)) 466 #define map_is_linear(map) ({ (void)(map); 1; }) 467 468 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */ 469 470 #endif /* __LINUX_MTD_MAP_H__ */ 471