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c6826471 AK |
1 | /* |
2 | * LPDDR flash memory device operations. This module provides read, write, | |
3 | * erase, lock/unlock support for LPDDR flash memories | |
4 | * (C) 2008 Korolev Alexey <akorolev@infradead.org> | |
5 | * (C) 2008 Vasiliy Leonenko <vasiliy.leonenko@gmail.com> | |
25985edc | 6 | * Many thanks to Roman Borisov for initial enabling |
c6826471 AK |
7 | * |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version 2 | |
11 | * of the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
21 | * 02110-1301, USA. | |
22 | * TODO: | |
23 | * Implement VPP management | |
24 | * Implement XIP support | |
25 | * Implement OTP support | |
26 | */ | |
27 | #include <linux/mtd/pfow.h> | |
28 | #include <linux/mtd/qinfo.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
c6826471 AK |
30 | |
31 | static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len, | |
32 | size_t *retlen, u_char *buf); | |
33 | static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, | |
34 | size_t len, size_t *retlen, const u_char *buf); | |
35 | static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
36 | unsigned long count, loff_t to, size_t *retlen); | |
37 | static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr); | |
38 | static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); | |
39 | static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); | |
40 | static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len, | |
41 | size_t *retlen, void **mtdbuf, resource_size_t *phys); | |
42 | static void lpddr_unpoint(struct mtd_info *mtd, loff_t adr, size_t len); | |
43 | static int get_chip(struct map_info *map, struct flchip *chip, int mode); | |
44 | static int chip_ready(struct map_info *map, struct flchip *chip, int mode); | |
45 | static void put_chip(struct map_info *map, struct flchip *chip); | |
46 | ||
47 | struct mtd_info *lpddr_cmdset(struct map_info *map) | |
48 | { | |
49 | struct lpddr_private *lpddr = map->fldrv_priv; | |
50 | struct flchip_shared *shared; | |
51 | struct flchip *chip; | |
52 | struct mtd_info *mtd; | |
53 | int numchips; | |
54 | int i, j; | |
55 | ||
56 | mtd = kzalloc(sizeof(*mtd), GFP_KERNEL); | |
57 | if (!mtd) { | |
58 | printk(KERN_ERR "Failed to allocate memory for MTD device\n"); | |
59 | return NULL; | |
60 | } | |
61 | mtd->priv = map; | |
62 | mtd->type = MTD_NORFLASH; | |
63 | ||
64 | /* Fill in the default mtd operations */ | |
65 | mtd->read = lpddr_read; | |
66 | mtd->type = MTD_NORFLASH; | |
67 | mtd->flags = MTD_CAP_NORFLASH; | |
68 | mtd->flags &= ~MTD_BIT_WRITEABLE; | |
69 | mtd->erase = lpddr_erase; | |
70 | mtd->write = lpddr_write_buffers; | |
71 | mtd->writev = lpddr_writev; | |
72 | mtd->read_oob = NULL; | |
73 | mtd->write_oob = NULL; | |
74 | mtd->sync = NULL; | |
75 | mtd->lock = lpddr_lock; | |
76 | mtd->unlock = lpddr_unlock; | |
77 | mtd->suspend = NULL; | |
78 | mtd->resume = NULL; | |
79 | if (map_is_linear(map)) { | |
80 | mtd->point = lpddr_point; | |
81 | mtd->unpoint = lpddr_unpoint; | |
82 | } | |
83 | mtd->block_isbad = NULL; | |
84 | mtd->block_markbad = NULL; | |
85 | mtd->size = 1 << lpddr->qinfo->DevSizeShift; | |
86 | mtd->erasesize = 1 << lpddr->qinfo->UniformBlockSizeShift; | |
87 | mtd->writesize = 1 << lpddr->qinfo->BufSizeShift; | |
88 | ||
89 | shared = kmalloc(sizeof(struct flchip_shared) * lpddr->numchips, | |
90 | GFP_KERNEL); | |
91 | if (!shared) { | |
92 | kfree(lpddr); | |
93 | kfree(mtd); | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | chip = &lpddr->chips[0]; | |
98 | numchips = lpddr->numchips / lpddr->qinfo->HWPartsNum; | |
99 | for (i = 0; i < numchips; i++) { | |
100 | shared[i].writing = shared[i].erasing = NULL; | |
8ae66418 | 101 | mutex_init(&shared[i].lock); |
c6826471 AK |
102 | for (j = 0; j < lpddr->qinfo->HWPartsNum; j++) { |
103 | *chip = lpddr->chips[i]; | |
104 | chip->start += j << lpddr->chipshift; | |
105 | chip->oldstate = chip->state = FL_READY; | |
106 | chip->priv = &shared[i]; | |
107 | /* those should be reset too since | |
108 | they create memory references. */ | |
109 | init_waitqueue_head(&chip->wq); | |
c4e77376 | 110 | mutex_init(&chip->mutex); |
c6826471 AK |
111 | chip++; |
112 | } | |
113 | } | |
114 | ||
115 | return mtd; | |
116 | } | |
117 | EXPORT_SYMBOL(lpddr_cmdset); | |
118 | ||
119 | static int wait_for_ready(struct map_info *map, struct flchip *chip, | |
120 | unsigned int chip_op_time) | |
121 | { | |
122 | unsigned int timeo, reset_timeo, sleep_time; | |
123 | unsigned int dsr; | |
124 | flstate_t chip_state = chip->state; | |
125 | int ret = 0; | |
126 | ||
127 | /* set our timeout to 8 times the expected delay */ | |
128 | timeo = chip_op_time * 8; | |
129 | if (!timeo) | |
130 | timeo = 500000; | |
131 | reset_timeo = timeo; | |
132 | sleep_time = chip_op_time / 2; | |
133 | ||
134 | for (;;) { | |
135 | dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR)); | |
136 | if (dsr & DSR_READY_STATUS) | |
137 | break; | |
138 | if (!timeo) { | |
139 | printk(KERN_ERR "%s: Flash timeout error state %d \n", | |
140 | map->name, chip_state); | |
141 | ret = -ETIME; | |
142 | break; | |
143 | } | |
144 | ||
145 | /* OK Still waiting. Drop the lock, wait a while and retry. */ | |
c4e77376 | 146 | mutex_unlock(&chip->mutex); |
c6826471 AK |
147 | if (sleep_time >= 1000000/HZ) { |
148 | /* | |
149 | * Half of the normal delay still remaining | |
150 | * can be performed with a sleeping delay instead | |
151 | * of busy waiting. | |
152 | */ | |
153 | msleep(sleep_time/1000); | |
154 | timeo -= sleep_time; | |
155 | sleep_time = 1000000/HZ; | |
156 | } else { | |
157 | udelay(1); | |
158 | cond_resched(); | |
159 | timeo--; | |
160 | } | |
c4e77376 | 161 | mutex_lock(&chip->mutex); |
c6826471 AK |
162 | |
163 | while (chip->state != chip_state) { | |
164 | /* Someone's suspended the operation: sleep */ | |
165 | DECLARE_WAITQUEUE(wait, current); | |
166 | set_current_state(TASK_UNINTERRUPTIBLE); | |
167 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 168 | mutex_unlock(&chip->mutex); |
c6826471 AK |
169 | schedule(); |
170 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 171 | mutex_lock(&chip->mutex); |
c6826471 AK |
172 | } |
173 | if (chip->erase_suspended || chip->write_suspended) { | |
25985edc | 174 | /* Suspend has occurred while sleep: reset timeout */ |
c6826471 AK |
175 | timeo = reset_timeo; |
176 | chip->erase_suspended = chip->write_suspended = 0; | |
177 | } | |
178 | } | |
179 | /* check status for errors */ | |
180 | if (dsr & DSR_ERR) { | |
181 | /* Clear DSR*/ | |
182 | map_write(map, CMD(~(DSR_ERR)), map->pfow_base + PFOW_DSR); | |
183 | printk(KERN_WARNING"%s: Bad status on wait: 0x%x \n", | |
184 | map->name, dsr); | |
185 | print_drs_error(dsr); | |
186 | ret = -EIO; | |
187 | } | |
188 | chip->state = FL_READY; | |
189 | return ret; | |
190 | } | |
191 | ||
192 | static int get_chip(struct map_info *map, struct flchip *chip, int mode) | |
193 | { | |
194 | int ret; | |
195 | DECLARE_WAITQUEUE(wait, current); | |
196 | ||
197 | retry: | |
198 | if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING) | |
199 | && chip->state != FL_SYNCING) { | |
200 | /* | |
201 | * OK. We have possibility for contension on the write/erase | |
202 | * operations which are global to the real chip and not per | |
203 | * partition. So let's fight it over in the partition which | |
204 | * currently has authority on the operation. | |
205 | * | |
206 | * The rules are as follows: | |
207 | * | |
208 | * - any write operation must own shared->writing. | |
209 | * | |
210 | * - any erase operation must own _both_ shared->writing and | |
211 | * shared->erasing. | |
212 | * | |
213 | * - contension arbitration is handled in the owner's context. | |
214 | * | |
215 | * The 'shared' struct can be read and/or written only when | |
216 | * its lock is taken. | |
217 | */ | |
218 | struct flchip_shared *shared = chip->priv; | |
219 | struct flchip *contender; | |
8ae66418 | 220 | mutex_lock(&shared->lock); |
c6826471 AK |
221 | contender = shared->writing; |
222 | if (contender && contender != chip) { | |
223 | /* | |
224 | * The engine to perform desired operation on this | |
225 | * partition is already in use by someone else. | |
226 | * Let's fight over it in the context of the chip | |
227 | * currently using it. If it is possible to suspend, | |
228 | * that other partition will do just that, otherwise | |
229 | * it'll happily send us to sleep. In any case, when | |
230 | * get_chip returns success we're clear to go ahead. | |
231 | */ | |
c4e77376 | 232 | ret = mutex_trylock(&contender->mutex); |
8ae66418 | 233 | mutex_unlock(&shared->lock); |
c6826471 AK |
234 | if (!ret) |
235 | goto retry; | |
c4e77376 | 236 | mutex_unlock(&chip->mutex); |
c6826471 | 237 | ret = chip_ready(map, contender, mode); |
c4e77376 | 238 | mutex_lock(&chip->mutex); |
c6826471 AK |
239 | |
240 | if (ret == -EAGAIN) { | |
c4e77376 | 241 | mutex_unlock(&contender->mutex); |
c6826471 AK |
242 | goto retry; |
243 | } | |
244 | if (ret) { | |
c4e77376 | 245 | mutex_unlock(&contender->mutex); |
c6826471 AK |
246 | return ret; |
247 | } | |
8ae66418 | 248 | mutex_lock(&shared->lock); |
c6826471 AK |
249 | |
250 | /* We should not own chip if it is already in FL_SYNCING | |
251 | * state. Put contender and retry. */ | |
252 | if (chip->state == FL_SYNCING) { | |
253 | put_chip(map, contender); | |
c4e77376 | 254 | mutex_unlock(&contender->mutex); |
c6826471 AK |
255 | goto retry; |
256 | } | |
c4e77376 | 257 | mutex_unlock(&contender->mutex); |
c6826471 AK |
258 | } |
259 | ||
260 | /* Check if we have suspended erase on this chip. | |
261 | Must sleep in such a case. */ | |
262 | if (mode == FL_ERASING && shared->erasing | |
263 | && shared->erasing->oldstate == FL_ERASING) { | |
8ae66418 | 264 | mutex_unlock(&shared->lock); |
c6826471 AK |
265 | set_current_state(TASK_UNINTERRUPTIBLE); |
266 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 267 | mutex_unlock(&chip->mutex); |
c6826471 AK |
268 | schedule(); |
269 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 270 | mutex_lock(&chip->mutex); |
c6826471 AK |
271 | goto retry; |
272 | } | |
273 | ||
274 | /* We now own it */ | |
275 | shared->writing = chip; | |
276 | if (mode == FL_ERASING) | |
277 | shared->erasing = chip; | |
8ae66418 | 278 | mutex_unlock(&shared->lock); |
c6826471 AK |
279 | } |
280 | ||
281 | ret = chip_ready(map, chip, mode); | |
282 | if (ret == -EAGAIN) | |
283 | goto retry; | |
284 | ||
285 | return ret; | |
286 | } | |
287 | ||
288 | static int chip_ready(struct map_info *map, struct flchip *chip, int mode) | |
289 | { | |
290 | struct lpddr_private *lpddr = map->fldrv_priv; | |
291 | int ret = 0; | |
292 | DECLARE_WAITQUEUE(wait, current); | |
293 | ||
294 | /* Prevent setting state FL_SYNCING for chip in suspended state. */ | |
295 | if (FL_SYNCING == mode && FL_READY != chip->oldstate) | |
296 | goto sleep; | |
297 | ||
298 | switch (chip->state) { | |
299 | case FL_READY: | |
300 | case FL_JEDEC_QUERY: | |
301 | return 0; | |
302 | ||
303 | case FL_ERASING: | |
304 | if (!lpddr->qinfo->SuspEraseSupp || | |
305 | !(mode == FL_READY || mode == FL_POINT)) | |
306 | goto sleep; | |
307 | ||
308 | map_write(map, CMD(LPDDR_SUSPEND), | |
309 | map->pfow_base + PFOW_PROGRAM_ERASE_SUSPEND); | |
310 | chip->oldstate = FL_ERASING; | |
311 | chip->state = FL_ERASE_SUSPENDING; | |
312 | ret = wait_for_ready(map, chip, 0); | |
313 | if (ret) { | |
314 | /* Oops. something got wrong. */ | |
315 | /* Resume and pretend we weren't here. */ | |
100f2341 | 316 | put_chip(map, chip); |
c6826471 AK |
317 | printk(KERN_ERR "%s: suspend operation failed." |
318 | "State may be wrong \n", map->name); | |
319 | return -EIO; | |
320 | } | |
321 | chip->erase_suspended = 1; | |
322 | chip->state = FL_READY; | |
323 | return 0; | |
324 | /* Erase suspend */ | |
325 | case FL_POINT: | |
326 | /* Only if there's no operation suspended... */ | |
327 | if (mode == FL_READY && chip->oldstate == FL_READY) | |
328 | return 0; | |
329 | ||
330 | default: | |
331 | sleep: | |
332 | set_current_state(TASK_UNINTERRUPTIBLE); | |
333 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 334 | mutex_unlock(&chip->mutex); |
c6826471 AK |
335 | schedule(); |
336 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 337 | mutex_lock(&chip->mutex); |
c6826471 AK |
338 | return -EAGAIN; |
339 | } | |
340 | } | |
341 | ||
342 | static void put_chip(struct map_info *map, struct flchip *chip) | |
343 | { | |
344 | if (chip->priv) { | |
345 | struct flchip_shared *shared = chip->priv; | |
8ae66418 | 346 | mutex_lock(&shared->lock); |
c6826471 AK |
347 | if (shared->writing == chip && chip->oldstate == FL_READY) { |
348 | /* We own the ability to write, but we're done */ | |
349 | shared->writing = shared->erasing; | |
350 | if (shared->writing && shared->writing != chip) { | |
351 | /* give back the ownership */ | |
352 | struct flchip *loaner = shared->writing; | |
c4e77376 | 353 | mutex_lock(&loaner->mutex); |
8ae66418 | 354 | mutex_unlock(&shared->lock); |
c4e77376 | 355 | mutex_unlock(&chip->mutex); |
c6826471 | 356 | put_chip(map, loaner); |
c4e77376 SS |
357 | mutex_lock(&chip->mutex); |
358 | mutex_unlock(&loaner->mutex); | |
c6826471 AK |
359 | wake_up(&chip->wq); |
360 | return; | |
361 | } | |
362 | shared->erasing = NULL; | |
363 | shared->writing = NULL; | |
364 | } else if (shared->erasing == chip && shared->writing != chip) { | |
365 | /* | |
366 | * We own the ability to erase without the ability | |
367 | * to write, which means the erase was suspended | |
368 | * and some other partition is currently writing. | |
369 | * Don't let the switch below mess things up since | |
370 | * we don't have ownership to resume anything. | |
371 | */ | |
8ae66418 | 372 | mutex_unlock(&shared->lock); |
c6826471 AK |
373 | wake_up(&chip->wq); |
374 | return; | |
375 | } | |
8ae66418 | 376 | mutex_unlock(&shared->lock); |
c6826471 AK |
377 | } |
378 | ||
379 | switch (chip->oldstate) { | |
380 | case FL_ERASING: | |
c6826471 AK |
381 | map_write(map, CMD(LPDDR_RESUME), |
382 | map->pfow_base + PFOW_COMMAND_CODE); | |
383 | map_write(map, CMD(LPDDR_START_EXECUTION), | |
384 | map->pfow_base + PFOW_COMMAND_EXECUTE); | |
385 | chip->oldstate = FL_READY; | |
386 | chip->state = FL_ERASING; | |
387 | break; | |
388 | case FL_READY: | |
389 | break; | |
390 | default: | |
391 | printk(KERN_ERR "%s: put_chip() called with oldstate %d!\n", | |
392 | map->name, chip->oldstate); | |
393 | } | |
394 | wake_up(&chip->wq); | |
395 | } | |
396 | ||
397 | int do_write_buffer(struct map_info *map, struct flchip *chip, | |
398 | unsigned long adr, const struct kvec **pvec, | |
399 | unsigned long *pvec_seek, int len) | |
400 | { | |
401 | struct lpddr_private *lpddr = map->fldrv_priv; | |
402 | map_word datum; | |
403 | int ret, wbufsize, word_gap, words; | |
404 | const struct kvec *vec; | |
405 | unsigned long vec_seek; | |
406 | unsigned long prog_buf_ofs; | |
407 | ||
408 | wbufsize = 1 << lpddr->qinfo->BufSizeShift; | |
409 | ||
c4e77376 | 410 | mutex_lock(&chip->mutex); |
c6826471 AK |
411 | ret = get_chip(map, chip, FL_WRITING); |
412 | if (ret) { | |
c4e77376 | 413 | mutex_unlock(&chip->mutex); |
c6826471 AK |
414 | return ret; |
415 | } | |
416 | /* Figure out the number of words to write */ | |
417 | word_gap = (-adr & (map_bankwidth(map)-1)); | |
418 | words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map); | |
419 | if (!word_gap) { | |
420 | words--; | |
421 | } else { | |
422 | word_gap = map_bankwidth(map) - word_gap; | |
423 | adr -= word_gap; | |
424 | datum = map_word_ff(map); | |
425 | } | |
426 | /* Write data */ | |
427 | /* Get the program buffer offset from PFOW register data first*/ | |
428 | prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map, | |
429 | map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET)); | |
430 | vec = *pvec; | |
431 | vec_seek = *pvec_seek; | |
432 | do { | |
433 | int n = map_bankwidth(map) - word_gap; | |
434 | ||
435 | if (n > vec->iov_len - vec_seek) | |
436 | n = vec->iov_len - vec_seek; | |
437 | if (n > len) | |
438 | n = len; | |
439 | ||
440 | if (!word_gap && (len < map_bankwidth(map))) | |
441 | datum = map_word_ff(map); | |
442 | ||
443 | datum = map_word_load_partial(map, datum, | |
444 | vec->iov_base + vec_seek, word_gap, n); | |
445 | ||
446 | len -= n; | |
447 | word_gap += n; | |
448 | if (!len || word_gap == map_bankwidth(map)) { | |
449 | map_write(map, datum, prog_buf_ofs); | |
450 | prog_buf_ofs += map_bankwidth(map); | |
451 | word_gap = 0; | |
452 | } | |
453 | ||
454 | vec_seek += n; | |
455 | if (vec_seek == vec->iov_len) { | |
456 | vec++; | |
457 | vec_seek = 0; | |
458 | } | |
459 | } while (len); | |
460 | *pvec = vec; | |
461 | *pvec_seek = vec_seek; | |
462 | ||
463 | /* GO GO GO */ | |
464 | send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL); | |
465 | chip->state = FL_WRITING; | |
466 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime)); | |
467 | if (ret) { | |
468 | printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n", | |
469 | map->name, ret, adr); | |
470 | goto out; | |
471 | } | |
472 | ||
473 | out: put_chip(map, chip); | |
c4e77376 | 474 | mutex_unlock(&chip->mutex); |
c6826471 AK |
475 | return ret; |
476 | } | |
477 | ||
478 | int do_erase_oneblock(struct mtd_info *mtd, loff_t adr) | |
479 | { | |
480 | struct map_info *map = mtd->priv; | |
481 | struct lpddr_private *lpddr = map->fldrv_priv; | |
482 | int chipnum = adr >> lpddr->chipshift; | |
483 | struct flchip *chip = &lpddr->chips[chipnum]; | |
484 | int ret; | |
485 | ||
c4e77376 | 486 | mutex_lock(&chip->mutex); |
c6826471 AK |
487 | ret = get_chip(map, chip, FL_ERASING); |
488 | if (ret) { | |
c4e77376 | 489 | mutex_unlock(&chip->mutex); |
c6826471 AK |
490 | return ret; |
491 | } | |
492 | send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL); | |
493 | chip->state = FL_ERASING; | |
494 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000); | |
495 | if (ret) { | |
496 | printk(KERN_WARNING"%s Erase block error %d at : %llx\n", | |
497 | map->name, ret, adr); | |
498 | goto out; | |
499 | } | |
500 | out: put_chip(map, chip); | |
c4e77376 | 501 | mutex_unlock(&chip->mutex); |
c6826471 AK |
502 | return ret; |
503 | } | |
504 | ||
505 | static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len, | |
506 | size_t *retlen, u_char *buf) | |
507 | { | |
508 | struct map_info *map = mtd->priv; | |
509 | struct lpddr_private *lpddr = map->fldrv_priv; | |
510 | int chipnum = adr >> lpddr->chipshift; | |
511 | struct flchip *chip = &lpddr->chips[chipnum]; | |
512 | int ret = 0; | |
513 | ||
c4e77376 | 514 | mutex_lock(&chip->mutex); |
c6826471 AK |
515 | ret = get_chip(map, chip, FL_READY); |
516 | if (ret) { | |
c4e77376 | 517 | mutex_unlock(&chip->mutex); |
c6826471 AK |
518 | return ret; |
519 | } | |
520 | ||
521 | map_copy_from(map, buf, adr, len); | |
522 | *retlen = len; | |
523 | ||
524 | put_chip(map, chip); | |
c4e77376 | 525 | mutex_unlock(&chip->mutex); |
c6826471 AK |
526 | return ret; |
527 | } | |
528 | ||
529 | static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len, | |
530 | size_t *retlen, void **mtdbuf, resource_size_t *phys) | |
531 | { | |
532 | struct map_info *map = mtd->priv; | |
533 | struct lpddr_private *lpddr = map->fldrv_priv; | |
534 | int chipnum = adr >> lpddr->chipshift; | |
535 | unsigned long ofs, last_end = 0; | |
536 | struct flchip *chip = &lpddr->chips[chipnum]; | |
537 | int ret = 0; | |
538 | ||
539 | if (!map->virt || (adr + len > mtd->size)) | |
540 | return -EINVAL; | |
541 | ||
542 | /* ofs: offset within the first chip that the first read should start */ | |
543 | ofs = adr - (chipnum << lpddr->chipshift); | |
544 | ||
545 | *mtdbuf = (void *)map->virt + chip->start + ofs; | |
546 | *retlen = 0; | |
547 | ||
548 | while (len) { | |
549 | unsigned long thislen; | |
550 | ||
551 | if (chipnum >= lpddr->numchips) | |
552 | break; | |
553 | ||
554 | /* We cannot point across chips that are virtually disjoint */ | |
555 | if (!last_end) | |
556 | last_end = chip->start; | |
557 | else if (chip->start != last_end) | |
558 | break; | |
559 | ||
560 | if ((len + ofs - 1) >> lpddr->chipshift) | |
561 | thislen = (1<<lpddr->chipshift) - ofs; | |
562 | else | |
563 | thislen = len; | |
564 | /* get the chip */ | |
c4e77376 | 565 | mutex_lock(&chip->mutex); |
c6826471 | 566 | ret = get_chip(map, chip, FL_POINT); |
c4e77376 | 567 | mutex_unlock(&chip->mutex); |
c6826471 AK |
568 | if (ret) |
569 | break; | |
570 | ||
571 | chip->state = FL_POINT; | |
572 | chip->ref_point_counter++; | |
573 | *retlen += thislen; | |
574 | len -= thislen; | |
575 | ||
576 | ofs = 0; | |
577 | last_end += 1 << lpddr->chipshift; | |
578 | chipnum++; | |
579 | chip = &lpddr->chips[chipnum]; | |
580 | } | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static void lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len) | |
585 | { | |
586 | struct map_info *map = mtd->priv; | |
587 | struct lpddr_private *lpddr = map->fldrv_priv; | |
588 | int chipnum = adr >> lpddr->chipshift; | |
589 | unsigned long ofs; | |
590 | ||
591 | /* ofs: offset within the first chip that the first read should start */ | |
592 | ofs = adr - (chipnum << lpddr->chipshift); | |
593 | ||
594 | while (len) { | |
595 | unsigned long thislen; | |
596 | struct flchip *chip; | |
597 | ||
598 | chip = &lpddr->chips[chipnum]; | |
599 | if (chipnum >= lpddr->numchips) | |
600 | break; | |
601 | ||
602 | if ((len + ofs - 1) >> lpddr->chipshift) | |
603 | thislen = (1<<lpddr->chipshift) - ofs; | |
604 | else | |
605 | thislen = len; | |
606 | ||
c4e77376 | 607 | mutex_lock(&chip->mutex); |
c6826471 AK |
608 | if (chip->state == FL_POINT) { |
609 | chip->ref_point_counter--; | |
610 | if (chip->ref_point_counter == 0) | |
611 | chip->state = FL_READY; | |
612 | } else | |
613 | printk(KERN_WARNING "%s: Warning: unpoint called on non" | |
614 | "pointed region\n", map->name); | |
615 | ||
616 | put_chip(map, chip); | |
c4e77376 | 617 | mutex_unlock(&chip->mutex); |
c6826471 AK |
618 | |
619 | len -= thislen; | |
620 | ofs = 0; | |
621 | chipnum++; | |
622 | } | |
623 | } | |
624 | ||
625 | static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len, | |
626 | size_t *retlen, const u_char *buf) | |
627 | { | |
628 | struct kvec vec; | |
629 | ||
630 | vec.iov_base = (void *) buf; | |
631 | vec.iov_len = len; | |
632 | ||
633 | return lpddr_writev(mtd, &vec, 1, to, retlen); | |
634 | } | |
635 | ||
636 | ||
637 | static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
638 | unsigned long count, loff_t to, size_t *retlen) | |
639 | { | |
640 | struct map_info *map = mtd->priv; | |
641 | struct lpddr_private *lpddr = map->fldrv_priv; | |
642 | int ret = 0; | |
643 | int chipnum; | |
644 | unsigned long ofs, vec_seek, i; | |
645 | int wbufsize = 1 << lpddr->qinfo->BufSizeShift; | |
646 | ||
647 | size_t len = 0; | |
648 | ||
649 | for (i = 0; i < count; i++) | |
650 | len += vecs[i].iov_len; | |
651 | ||
652 | *retlen = 0; | |
653 | if (!len) | |
654 | return 0; | |
655 | ||
656 | chipnum = to >> lpddr->chipshift; | |
657 | ||
658 | ofs = to; | |
659 | vec_seek = 0; | |
660 | ||
661 | do { | |
662 | /* We must not cross write block boundaries */ | |
663 | int size = wbufsize - (ofs & (wbufsize-1)); | |
664 | ||
665 | if (size > len) | |
666 | size = len; | |
667 | ||
668 | ret = do_write_buffer(map, &lpddr->chips[chipnum], | |
669 | ofs, &vecs, &vec_seek, size); | |
670 | if (ret) | |
671 | return ret; | |
672 | ||
673 | ofs += size; | |
674 | (*retlen) += size; | |
675 | len -= size; | |
676 | ||
677 | /* Be nice and reschedule with the chip in a usable | |
678 | * state for other processes */ | |
679 | cond_resched(); | |
680 | ||
681 | } while (len); | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr) | |
687 | { | |
688 | unsigned long ofs, len; | |
689 | int ret; | |
690 | struct map_info *map = mtd->priv; | |
691 | struct lpddr_private *lpddr = map->fldrv_priv; | |
692 | int size = 1 << lpddr->qinfo->UniformBlockSizeShift; | |
693 | ||
694 | ofs = instr->addr; | |
695 | len = instr->len; | |
696 | ||
697 | if (ofs > mtd->size || (len + ofs) > mtd->size) | |
698 | return -EINVAL; | |
699 | ||
700 | while (len > 0) { | |
701 | ret = do_erase_oneblock(mtd, ofs); | |
702 | if (ret) | |
703 | return ret; | |
704 | ofs += size; | |
705 | len -= size; | |
706 | } | |
707 | instr->state = MTD_ERASE_DONE; | |
708 | mtd_erase_callback(instr); | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | #define DO_XXLOCK_LOCK 1 | |
714 | #define DO_XXLOCK_UNLOCK 2 | |
715 | int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk) | |
716 | { | |
717 | int ret = 0; | |
718 | struct map_info *map = mtd->priv; | |
719 | struct lpddr_private *lpddr = map->fldrv_priv; | |
720 | int chipnum = adr >> lpddr->chipshift; | |
721 | struct flchip *chip = &lpddr->chips[chipnum]; | |
722 | ||
c4e77376 | 723 | mutex_lock(&chip->mutex); |
c6826471 AK |
724 | ret = get_chip(map, chip, FL_LOCKING); |
725 | if (ret) { | |
c4e77376 | 726 | mutex_unlock(&chip->mutex); |
c6826471 AK |
727 | return ret; |
728 | } | |
729 | ||
730 | if (thunk == DO_XXLOCK_LOCK) { | |
731 | send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL); | |
732 | chip->state = FL_LOCKING; | |
733 | } else if (thunk == DO_XXLOCK_UNLOCK) { | |
734 | send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL); | |
735 | chip->state = FL_UNLOCKING; | |
736 | } else | |
737 | BUG(); | |
738 | ||
739 | ret = wait_for_ready(map, chip, 1); | |
740 | if (ret) { | |
741 | printk(KERN_ERR "%s: block unlock error status %d \n", | |
742 | map->name, ret); | |
743 | goto out; | |
744 | } | |
745 | out: put_chip(map, chip); | |
c4e77376 | 746 | mutex_unlock(&chip->mutex); |
c6826471 AK |
747 | return ret; |
748 | } | |
749 | ||
750 | static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
751 | { | |
752 | return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK); | |
753 | } | |
754 | ||
755 | static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
756 | { | |
757 | return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK); | |
758 | } | |
759 | ||
760 | int word_program(struct map_info *map, loff_t adr, uint32_t curval) | |
761 | { | |
762 | int ret; | |
763 | struct lpddr_private *lpddr = map->fldrv_priv; | |
764 | int chipnum = adr >> lpddr->chipshift; | |
765 | struct flchip *chip = &lpddr->chips[chipnum]; | |
766 | ||
c4e77376 | 767 | mutex_lock(&chip->mutex); |
c6826471 AK |
768 | ret = get_chip(map, chip, FL_WRITING); |
769 | if (ret) { | |
c4e77376 | 770 | mutex_unlock(&chip->mutex); |
c6826471 AK |
771 | return ret; |
772 | } | |
773 | ||
774 | send_pfow_command(map, LPDDR_WORD_PROGRAM, adr, 0x00, (map_word *)&curval); | |
775 | ||
776 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->SingleWordProgTime)); | |
777 | if (ret) { | |
778 | printk(KERN_WARNING"%s word_program error at: %llx; val: %x\n", | |
779 | map->name, adr, curval); | |
780 | goto out; | |
781 | } | |
782 | ||
783 | out: put_chip(map, chip); | |
c4e77376 | 784 | mutex_unlock(&chip->mutex); |
c6826471 AK |
785 | return ret; |
786 | } | |
787 | ||
788 | MODULE_LICENSE("GPL"); | |
789 | MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>"); | |
790 | MODULE_DESCRIPTION("MTD driver for LPDDR flash chips"); |