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a1452a37 DW |
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 | */ | |
1da177e4 LT |
19 | |
20 | /* Overhauled routines for dealing with different mmap regions of flash */ | |
1da177e4 LT |
21 | |
22 | #ifndef __LINUX_MTD_MAP_H__ | |
23 | #define __LINUX_MTD_MAP_H__ | |
24 | ||
1da177e4 LT |
25 | #include <linux/types.h> |
26 | #include <linux/list.h> | |
4e57b681 | 27 | #include <linux/string.h> |
709c4efb | 28 | #include <linux/bug.h> |
4a422438 | 29 | #include <linux/kernel.h> |
2584cf83 | 30 | #include <linux/io.h> |
4e57b681 | 31 | |
1da177e4 | 32 | #include <asm/unaligned.h> |
96f951ed | 33 | #include <asm/barrier.h> |
1da177e4 LT |
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 | ||
7234bea6 | 80 | #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1)) / sizeof(unsigned long)) |
1da177e4 LT |
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 | |
fddcca51 AB |
125 | /* always use indirect access for 256-bit to preserve kernel stack */ |
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) | |
1da177e4 LT |
132 | #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32) |
133 | #undef MAX_MAP_BANKWIDTH | |
134 | #define MAX_MAP_BANKWIDTH 32 | |
135 | #else | |
136 | #define map_bankwidth_is_32(map) (0) | |
137 | #endif | |
138 | ||
139 | #ifndef map_bankwidth | |
fe7579d6 | 140 | #ifdef CONFIG_MTD |
241651d0 | 141 | #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work" |
fe7579d6 | 142 | #endif |
241651d0 DW |
143 | static inline int map_bankwidth(void *map) |
144 | { | |
145 | BUG(); | |
146 | return 0; | |
147 | } | |
148 | #define map_bankwidth_is_large(map) (0) | |
149 | #define map_words(map) (0) | |
150 | #define MAX_MAP_BANKWIDTH 1 | |
1da177e4 LT |
151 | #endif |
152 | ||
153 | static inline int map_bankwidth_supported(int w) | |
154 | { | |
155 | switch (w) { | |
156 | #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1 | |
157 | case 1: | |
158 | #endif | |
159 | #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2 | |
160 | case 2: | |
161 | #endif | |
162 | #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4 | |
163 | case 4: | |
164 | #endif | |
165 | #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8 | |
166 | case 8: | |
167 | #endif | |
168 | #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16 | |
169 | case 16: | |
170 | #endif | |
171 | #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32 | |
172 | case 32: | |
173 | #endif | |
174 | return 1; | |
175 | ||
176 | default: | |
177 | return 0; | |
178 | } | |
179 | } | |
180 | ||
7234bea6 | 181 | #define MAX_MAP_LONGS (((MAX_MAP_BANKWIDTH * 8) + BITS_PER_LONG - 1) / BITS_PER_LONG) |
1da177e4 LT |
182 | |
183 | typedef union { | |
184 | unsigned long x[MAX_MAP_LONGS]; | |
185 | } map_word; | |
186 | ||
187 | /* The map stuff is very simple. You fill in your struct map_info with | |
188 | a handful of routines for accessing the device, making sure they handle | |
189 | paging etc. correctly if your device needs it. Then you pass it off | |
190 | to a chip probe routine -- either JEDEC or CFI probe or both -- via | |
191 | do_map_probe(). If a chip is recognised, the probe code will invoke the | |
192 | appropriate chip driver (if present) and return a struct mtd_info. | |
61ecfa87 | 193 | At which point, you fill in the mtd->module with your own module |
1da177e4 LT |
194 | address, and register it with the MTD core code. Or you could partition |
195 | it and register the partitions instead, or keep it for your own private | |
196 | use; whatever. | |
61ecfa87 | 197 | |
1da177e4 | 198 | The mtd->priv field will point to the struct map_info, and any further |
61ecfa87 TG |
199 | private data required by the chip driver is linked from the |
200 | mtd->priv->fldrv_priv field. This allows the map driver to get at | |
1da177e4 LT |
201 | the destructor function map->fldrv_destroy() when it's tired |
202 | of living. | |
203 | */ | |
204 | ||
205 | struct map_info { | |
eadcf0d7 | 206 | const char *name; |
1da177e4 | 207 | unsigned long size; |
0d36da3b | 208 | resource_size_t phys; |
1da177e4 LT |
209 | #define NO_XIP (-1UL) |
210 | ||
211 | void __iomem *virt; | |
212 | void *cached; | |
213 | ||
8e987465 | 214 | int swap; /* this mapping's byte-swapping requirement */ |
1da177e4 LT |
215 | int bankwidth; /* in octets. This isn't necessarily the width |
216 | of actual bus cycles -- it's the repeat interval | |
217 | in bytes, before you are talking to the first chip again. | |
218 | */ | |
219 | ||
220 | #ifdef CONFIG_MTD_COMPLEX_MAPPINGS | |
221 | map_word (*read)(struct map_info *, unsigned long); | |
222 | void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t); | |
223 | ||
224 | void (*write)(struct map_info *, const map_word, unsigned long); | |
225 | void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t); | |
226 | ||
227 | /* We can perhaps put in 'point' and 'unpoint' methods, if we really | |
228 | want to enable XIP for non-linear mappings. Not yet though. */ | |
229 | #endif | |
230 | /* It's possible for the map driver to use cached memory in its | |
231 | copy_from implementation (and _only_ with copy_from). However, | |
232 | when the chip driver knows some flash area has changed contents, | |
233 | it will signal it to the map driver through this routine to let | |
234 | the map driver invalidate the corresponding cache as needed. | |
235 | If there is no cache to care about this can be set to NULL. */ | |
236 | void (*inval_cache)(struct map_info *, unsigned long, ssize_t); | |
237 | ||
95a001f2 LW |
238 | /* This will be called with 1 as parameter when the first map user |
239 | * needs VPP, and called with 0 when the last user exits. The map | |
240 | * core maintains a reference counter, and assumes that VPP is a | |
241 | * global resource applying to all mapped flash chips on the system. | |
242 | */ | |
1da177e4 LT |
243 | void (*set_vpp)(struct map_info *, int); |
244 | ||
d13e51e7 | 245 | unsigned long pfow_base; |
1da177e4 LT |
246 | unsigned long map_priv_1; |
247 | unsigned long map_priv_2; | |
1648eaaa | 248 | struct device_node *device_node; |
1da177e4 LT |
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 | ||
7234bea6 AB |
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) | |
1da177e4 LT |
269 | |
270 | #define INVALIDATE_CACHED_RANGE(map, from, size) \ | |
7234bea6 | 271 | do { if (map->inval_cache) map->inval_cache(map, from, size); } while (0) |
1da177e4 LT |
272 | |
273 | ||
274 | static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2) | |
275 | { | |
276 | int i; | |
7234bea6 AB |
277 | |
278 | for (i = 0; i < map_words(map); i++) { | |
1da177e4 LT |
279 | if (val1.x[i] != val2.x[i]) |
280 | return 0; | |
281 | } | |
7234bea6 | 282 | |
1da177e4 LT |
283 | return 1; |
284 | } | |
285 | ||
286 | static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2) | |
287 | { | |
288 | map_word r; | |
289 | int i; | |
290 | ||
7234bea6 | 291 | for (i = 0; i < map_words(map); i++) |
1da177e4 | 292 | r.x[i] = val1.x[i] & val2.x[i]; |
7234bea6 | 293 | |
1da177e4 LT |
294 | return r; |
295 | } | |
296 | ||
f77814dd NP |
297 | static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2) |
298 | { | |
299 | map_word r; | |
300 | int i; | |
301 | ||
7234bea6 | 302 | for (i = 0; i < map_words(map); i++) |
f77814dd | 303 | r.x[i] = val1.x[i] & ~val2.x[i]; |
7234bea6 | 304 | |
f77814dd NP |
305 | return r; |
306 | } | |
307 | ||
1da177e4 LT |
308 | static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2) |
309 | { | |
310 | map_word r; | |
311 | int i; | |
312 | ||
7234bea6 | 313 | for (i = 0; i < map_words(map); i++) |
1da177e4 | 314 | r.x[i] = val1.x[i] | val2.x[i]; |
7234bea6 | 315 | |
1da177e4 LT |
316 | return r; |
317 | } | |
f77814dd | 318 | |
d09957fb AB |
319 | static inline int map_word_andequal(struct map_info *map, map_word val1, map_word val2, map_word val3) |
320 | { | |
321 | int i; | |
322 | ||
323 | for (i = 0; i < map_words(map); i++) { | |
324 | if ((val1.x[i] & val2.x[i]) != val3.x[i]) | |
325 | return 0; | |
326 | } | |
327 | ||
328 | return 1; | |
329 | } | |
1da177e4 LT |
330 | |
331 | static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2) | |
332 | { | |
333 | int i; | |
334 | ||
7234bea6 | 335 | for (i = 0; i < map_words(map); i++) { |
1da177e4 LT |
336 | if (val1.x[i] & val2.x[i]) |
337 | return 1; | |
338 | } | |
7234bea6 | 339 | |
1da177e4 LT |
340 | return 0; |
341 | } | |
342 | ||
343 | static inline map_word map_word_load(struct map_info *map, const void *ptr) | |
344 | { | |
24dea0c9 | 345 | map_word r; |
1da177e4 LT |
346 | |
347 | if (map_bankwidth_is_1(map)) | |
348 | r.x[0] = *(unsigned char *)ptr; | |
349 | else if (map_bankwidth_is_2(map)) | |
350 | r.x[0] = get_unaligned((uint16_t *)ptr); | |
351 | else if (map_bankwidth_is_4(map)) | |
352 | r.x[0] = get_unaligned((uint32_t *)ptr); | |
353 | #if BITS_PER_LONG >= 64 | |
354 | else if (map_bankwidth_is_8(map)) | |
355 | r.x[0] = get_unaligned((uint64_t *)ptr); | |
356 | #endif | |
357 | else if (map_bankwidth_is_large(map)) | |
358 | memcpy(r.x, ptr, map->bankwidth); | |
24dea0c9 DES |
359 | else |
360 | BUG(); | |
1da177e4 LT |
361 | |
362 | return r; | |
363 | } | |
364 | ||
365 | static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len) | |
366 | { | |
367 | int i; | |
368 | ||
369 | if (map_bankwidth_is_large(map)) { | |
370 | char *dest = (char *)&orig; | |
7234bea6 | 371 | |
1da177e4 LT |
372 | memcpy(dest+start, buf, len); |
373 | } else { | |
7234bea6 | 374 | for (i = start; i < start+len; i++) { |
1da177e4 | 375 | int bitpos; |
7234bea6 | 376 | |
1da177e4 | 377 | #ifdef __LITTLE_ENDIAN |
7234bea6 | 378 | bitpos = i * 8; |
1da177e4 | 379 | #else /* __BIG_ENDIAN */ |
7234bea6 | 380 | bitpos = (map_bankwidth(map) - 1 - i) * 8; |
1da177e4 LT |
381 | #endif |
382 | orig.x[0] &= ~(0xff << bitpos); | |
a4d62bab | 383 | orig.x[0] |= (unsigned long)buf[i-start] << bitpos; |
1da177e4 LT |
384 | } |
385 | } | |
386 | return orig; | |
387 | } | |
388 | ||
3a3ab48c TG |
389 | #if BITS_PER_LONG < 64 |
390 | #define MAP_FF_LIMIT 4 | |
391 | #else | |
392 | #define MAP_FF_LIMIT 8 | |
393 | #endif | |
394 | ||
1da177e4 LT |
395 | static inline map_word map_word_ff(struct map_info *map) |
396 | { | |
397 | map_word r; | |
398 | int i; | |
61ecfa87 | 399 | |
b0435695 | 400 | if (map_bankwidth(map) < MAP_FF_LIMIT) { |
a8aff8ab | 401 | int bw = 8 * map_bankwidth(map); |
7234bea6 | 402 | |
a4d62bab | 403 | r.x[0] = (1UL << bw) - 1; |
3a3ab48c | 404 | } else { |
7234bea6 | 405 | for (i = 0; i < map_words(map); i++) |
3a3ab48c | 406 | r.x[i] = ~0UL; |
1da177e4 LT |
407 | } |
408 | return r; | |
409 | } | |
f77814dd | 410 | |
1da177e4 LT |
411 | static inline map_word inline_map_read(struct map_info *map, unsigned long ofs) |
412 | { | |
24dea0c9 | 413 | map_word r; |
1da177e4 LT |
414 | |
415 | if (map_bankwidth_is_1(map)) | |
416 | r.x[0] = __raw_readb(map->virt + ofs); | |
417 | else if (map_bankwidth_is_2(map)) | |
418 | r.x[0] = __raw_readw(map->virt + ofs); | |
419 | else if (map_bankwidth_is_4(map)) | |
420 | r.x[0] = __raw_readl(map->virt + ofs); | |
421 | #if BITS_PER_LONG >= 64 | |
422 | else if (map_bankwidth_is_8(map)) | |
423 | r.x[0] = __raw_readq(map->virt + ofs); | |
424 | #endif | |
425 | else if (map_bankwidth_is_large(map)) | |
7234bea6 | 426 | memcpy_fromio(r.x, map->virt + ofs, map->bankwidth); |
9ea59738 KC |
427 | else |
428 | BUG(); | |
1da177e4 LT |
429 | |
430 | return r; | |
431 | } | |
432 | ||
433 | static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs) | |
434 | { | |
435 | if (map_bankwidth_is_1(map)) | |
436 | __raw_writeb(datum.x[0], map->virt + ofs); | |
437 | else if (map_bankwidth_is_2(map)) | |
438 | __raw_writew(datum.x[0], map->virt + ofs); | |
439 | else if (map_bankwidth_is_4(map)) | |
440 | __raw_writel(datum.x[0], map->virt + ofs); | |
441 | #if BITS_PER_LONG >= 64 | |
442 | else if (map_bankwidth_is_8(map)) | |
443 | __raw_writeq(datum.x[0], map->virt + ofs); | |
444 | #endif | |
445 | else if (map_bankwidth_is_large(map)) | |
446 | memcpy_toio(map->virt+ofs, datum.x, map->bankwidth); | |
24dea0c9 DES |
447 | else |
448 | BUG(); | |
1da177e4 LT |
449 | mb(); |
450 | } | |
451 | ||
452 | static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) | |
453 | { | |
454 | if (map->cached) | |
455 | memcpy(to, (char *)map->cached + from, len); | |
456 | else | |
457 | memcpy_fromio(to, map->virt + from, len); | |
458 | } | |
459 | ||
460 | static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) | |
461 | { | |
462 | memcpy_toio(map->virt + to, from, len); | |
463 | } | |
464 | ||
465 | #ifdef CONFIG_MTD_COMPLEX_MAPPINGS | |
466 | #define map_read(map, ofs) (map)->read(map, ofs) | |
467 | #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len) | |
468 | #define map_write(map, datum, ofs) (map)->write(map, datum, ofs) | |
469 | #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len) | |
470 | ||
471 | extern void simple_map_init(struct map_info *); | |
472 | #define map_is_linear(map) (map->phys != NO_XIP) | |
473 | ||
474 | #else | |
475 | #define map_read(map, ofs) inline_map_read(map, ofs) | |
476 | #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len) | |
477 | #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs) | |
478 | #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len) | |
479 | ||
480 | ||
481 | #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth)) | |
f16407d7 | 482 | #define map_is_linear(map) ({ (void)(map); 1; }) |
1da177e4 LT |
483 | |
484 | #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */ | |
485 | ||
486 | #endif /* __LINUX_MTD_MAP_H__ */ |