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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> |
a0e5cc58 | 30 | #include <linux/module.h> |
c6826471 AK |
31 | |
32 | static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len, | |
33 | size_t *retlen, u_char *buf); | |
34 | static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, | |
35 | size_t len, size_t *retlen, const u_char *buf); | |
36 | static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
37 | unsigned long count, loff_t to, size_t *retlen); | |
38 | static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr); | |
39 | static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); | |
40 | static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); | |
41 | static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len, | |
42 | size_t *retlen, void **mtdbuf, resource_size_t *phys); | |
5e4e6e3f | 43 | static int lpddr_unpoint(struct mtd_info *mtd, loff_t adr, size_t len); |
c6826471 AK |
44 | static int get_chip(struct map_info *map, struct flchip *chip, int mode); |
45 | static int chip_ready(struct map_info *map, struct flchip *chip, int mode); | |
46 | static void put_chip(struct map_info *map, struct flchip *chip); | |
47 | ||
48 | struct mtd_info *lpddr_cmdset(struct map_info *map) | |
49 | { | |
50 | struct lpddr_private *lpddr = map->fldrv_priv; | |
51 | struct flchip_shared *shared; | |
52 | struct flchip *chip; | |
53 | struct mtd_info *mtd; | |
54 | int numchips; | |
55 | int i, j; | |
56 | ||
57 | mtd = kzalloc(sizeof(*mtd), GFP_KERNEL); | |
54f5a57e | 58 | if (!mtd) |
c6826471 | 59 | return NULL; |
c6826471 AK |
60 | mtd->priv = map; |
61 | mtd->type = MTD_NORFLASH; | |
62 | ||
63 | /* Fill in the default mtd operations */ | |
3c3c10bb | 64 | mtd->_read = lpddr_read; |
c6826471 AK |
65 | mtd->type = MTD_NORFLASH; |
66 | mtd->flags = MTD_CAP_NORFLASH; | |
67 | mtd->flags &= ~MTD_BIT_WRITEABLE; | |
3c3c10bb AB |
68 | mtd->_erase = lpddr_erase; |
69 | mtd->_write = lpddr_write_buffers; | |
70 | mtd->_writev = lpddr_writev; | |
71 | mtd->_lock = lpddr_lock; | |
72 | mtd->_unlock = lpddr_unlock; | |
c6826471 | 73 | if (map_is_linear(map)) { |
3c3c10bb AB |
74 | mtd->_point = lpddr_point; |
75 | mtd->_unpoint = lpddr_unpoint; | |
c6826471 | 76 | } |
c6826471 AK |
77 | mtd->size = 1 << lpddr->qinfo->DevSizeShift; |
78 | mtd->erasesize = 1 << lpddr->qinfo->UniformBlockSizeShift; | |
79 | mtd->writesize = 1 << lpddr->qinfo->BufSizeShift; | |
80 | ||
81 | shared = kmalloc(sizeof(struct flchip_shared) * lpddr->numchips, | |
82 | GFP_KERNEL); | |
83 | if (!shared) { | |
84 | kfree(lpddr); | |
85 | kfree(mtd); | |
86 | return NULL; | |
87 | } | |
88 | ||
89 | chip = &lpddr->chips[0]; | |
90 | numchips = lpddr->numchips / lpddr->qinfo->HWPartsNum; | |
91 | for (i = 0; i < numchips; i++) { | |
92 | shared[i].writing = shared[i].erasing = NULL; | |
8ae66418 | 93 | mutex_init(&shared[i].lock); |
c6826471 AK |
94 | for (j = 0; j < lpddr->qinfo->HWPartsNum; j++) { |
95 | *chip = lpddr->chips[i]; | |
96 | chip->start += j << lpddr->chipshift; | |
97 | chip->oldstate = chip->state = FL_READY; | |
98 | chip->priv = &shared[i]; | |
99 | /* those should be reset too since | |
100 | they create memory references. */ | |
101 | init_waitqueue_head(&chip->wq); | |
c4e77376 | 102 | mutex_init(&chip->mutex); |
c6826471 AK |
103 | chip++; |
104 | } | |
105 | } | |
106 | ||
107 | return mtd; | |
108 | } | |
109 | EXPORT_SYMBOL(lpddr_cmdset); | |
110 | ||
111 | static int wait_for_ready(struct map_info *map, struct flchip *chip, | |
112 | unsigned int chip_op_time) | |
113 | { | |
114 | unsigned int timeo, reset_timeo, sleep_time; | |
115 | unsigned int dsr; | |
116 | flstate_t chip_state = chip->state; | |
117 | int ret = 0; | |
118 | ||
119 | /* set our timeout to 8 times the expected delay */ | |
120 | timeo = chip_op_time * 8; | |
121 | if (!timeo) | |
122 | timeo = 500000; | |
123 | reset_timeo = timeo; | |
124 | sleep_time = chip_op_time / 2; | |
125 | ||
126 | for (;;) { | |
127 | dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR)); | |
128 | if (dsr & DSR_READY_STATUS) | |
129 | break; | |
130 | if (!timeo) { | |
131 | printk(KERN_ERR "%s: Flash timeout error state %d \n", | |
132 | map->name, chip_state); | |
133 | ret = -ETIME; | |
134 | break; | |
135 | } | |
136 | ||
137 | /* OK Still waiting. Drop the lock, wait a while and retry. */ | |
c4e77376 | 138 | mutex_unlock(&chip->mutex); |
c6826471 AK |
139 | if (sleep_time >= 1000000/HZ) { |
140 | /* | |
141 | * Half of the normal delay still remaining | |
142 | * can be performed with a sleeping delay instead | |
143 | * of busy waiting. | |
144 | */ | |
145 | msleep(sleep_time/1000); | |
146 | timeo -= sleep_time; | |
147 | sleep_time = 1000000/HZ; | |
148 | } else { | |
149 | udelay(1); | |
150 | cond_resched(); | |
151 | timeo--; | |
152 | } | |
c4e77376 | 153 | mutex_lock(&chip->mutex); |
c6826471 AK |
154 | |
155 | while (chip->state != chip_state) { | |
156 | /* Someone's suspended the operation: sleep */ | |
157 | DECLARE_WAITQUEUE(wait, current); | |
158 | set_current_state(TASK_UNINTERRUPTIBLE); | |
159 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 160 | mutex_unlock(&chip->mutex); |
c6826471 AK |
161 | schedule(); |
162 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 163 | mutex_lock(&chip->mutex); |
c6826471 AK |
164 | } |
165 | if (chip->erase_suspended || chip->write_suspended) { | |
25985edc | 166 | /* Suspend has occurred while sleep: reset timeout */ |
c6826471 AK |
167 | timeo = reset_timeo; |
168 | chip->erase_suspended = chip->write_suspended = 0; | |
169 | } | |
170 | } | |
171 | /* check status for errors */ | |
172 | if (dsr & DSR_ERR) { | |
173 | /* Clear DSR*/ | |
174 | map_write(map, CMD(~(DSR_ERR)), map->pfow_base + PFOW_DSR); | |
175 | printk(KERN_WARNING"%s: Bad status on wait: 0x%x \n", | |
176 | map->name, dsr); | |
177 | print_drs_error(dsr); | |
178 | ret = -EIO; | |
179 | } | |
180 | chip->state = FL_READY; | |
181 | return ret; | |
182 | } | |
183 | ||
184 | static int get_chip(struct map_info *map, struct flchip *chip, int mode) | |
185 | { | |
186 | int ret; | |
187 | DECLARE_WAITQUEUE(wait, current); | |
188 | ||
189 | retry: | |
190 | if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING) | |
191 | && chip->state != FL_SYNCING) { | |
192 | /* | |
193 | * OK. We have possibility for contension on the write/erase | |
194 | * operations which are global to the real chip and not per | |
195 | * partition. So let's fight it over in the partition which | |
196 | * currently has authority on the operation. | |
197 | * | |
198 | * The rules are as follows: | |
199 | * | |
200 | * - any write operation must own shared->writing. | |
201 | * | |
202 | * - any erase operation must own _both_ shared->writing and | |
203 | * shared->erasing. | |
204 | * | |
205 | * - contension arbitration is handled in the owner's context. | |
206 | * | |
207 | * The 'shared' struct can be read and/or written only when | |
208 | * its lock is taken. | |
209 | */ | |
210 | struct flchip_shared *shared = chip->priv; | |
211 | struct flchip *contender; | |
8ae66418 | 212 | mutex_lock(&shared->lock); |
c6826471 AK |
213 | contender = shared->writing; |
214 | if (contender && contender != chip) { | |
215 | /* | |
216 | * The engine to perform desired operation on this | |
217 | * partition is already in use by someone else. | |
218 | * Let's fight over it in the context of the chip | |
219 | * currently using it. If it is possible to suspend, | |
220 | * that other partition will do just that, otherwise | |
221 | * it'll happily send us to sleep. In any case, when | |
222 | * get_chip returns success we're clear to go ahead. | |
223 | */ | |
c4e77376 | 224 | ret = mutex_trylock(&contender->mutex); |
8ae66418 | 225 | mutex_unlock(&shared->lock); |
c6826471 AK |
226 | if (!ret) |
227 | goto retry; | |
c4e77376 | 228 | mutex_unlock(&chip->mutex); |
c6826471 | 229 | ret = chip_ready(map, contender, mode); |
c4e77376 | 230 | mutex_lock(&chip->mutex); |
c6826471 AK |
231 | |
232 | if (ret == -EAGAIN) { | |
c4e77376 | 233 | mutex_unlock(&contender->mutex); |
c6826471 AK |
234 | goto retry; |
235 | } | |
236 | if (ret) { | |
c4e77376 | 237 | mutex_unlock(&contender->mutex); |
c6826471 AK |
238 | return ret; |
239 | } | |
8ae66418 | 240 | mutex_lock(&shared->lock); |
c6826471 AK |
241 | |
242 | /* We should not own chip if it is already in FL_SYNCING | |
243 | * state. Put contender and retry. */ | |
244 | if (chip->state == FL_SYNCING) { | |
245 | put_chip(map, contender); | |
c4e77376 | 246 | mutex_unlock(&contender->mutex); |
c6826471 AK |
247 | goto retry; |
248 | } | |
c4e77376 | 249 | mutex_unlock(&contender->mutex); |
c6826471 AK |
250 | } |
251 | ||
252 | /* Check if we have suspended erase on this chip. | |
253 | Must sleep in such a case. */ | |
254 | if (mode == FL_ERASING && shared->erasing | |
255 | && shared->erasing->oldstate == FL_ERASING) { | |
8ae66418 | 256 | mutex_unlock(&shared->lock); |
c6826471 AK |
257 | set_current_state(TASK_UNINTERRUPTIBLE); |
258 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 259 | mutex_unlock(&chip->mutex); |
c6826471 AK |
260 | schedule(); |
261 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 262 | mutex_lock(&chip->mutex); |
c6826471 AK |
263 | goto retry; |
264 | } | |
265 | ||
266 | /* We now own it */ | |
267 | shared->writing = chip; | |
268 | if (mode == FL_ERASING) | |
269 | shared->erasing = chip; | |
8ae66418 | 270 | mutex_unlock(&shared->lock); |
c6826471 AK |
271 | } |
272 | ||
273 | ret = chip_ready(map, chip, mode); | |
274 | if (ret == -EAGAIN) | |
275 | goto retry; | |
276 | ||
277 | return ret; | |
278 | } | |
279 | ||
280 | static int chip_ready(struct map_info *map, struct flchip *chip, int mode) | |
281 | { | |
282 | struct lpddr_private *lpddr = map->fldrv_priv; | |
283 | int ret = 0; | |
284 | DECLARE_WAITQUEUE(wait, current); | |
285 | ||
286 | /* Prevent setting state FL_SYNCING for chip in suspended state. */ | |
287 | if (FL_SYNCING == mode && FL_READY != chip->oldstate) | |
288 | goto sleep; | |
289 | ||
290 | switch (chip->state) { | |
291 | case FL_READY: | |
292 | case FL_JEDEC_QUERY: | |
293 | return 0; | |
294 | ||
295 | case FL_ERASING: | |
296 | if (!lpddr->qinfo->SuspEraseSupp || | |
297 | !(mode == FL_READY || mode == FL_POINT)) | |
298 | goto sleep; | |
299 | ||
300 | map_write(map, CMD(LPDDR_SUSPEND), | |
301 | map->pfow_base + PFOW_PROGRAM_ERASE_SUSPEND); | |
302 | chip->oldstate = FL_ERASING; | |
303 | chip->state = FL_ERASE_SUSPENDING; | |
304 | ret = wait_for_ready(map, chip, 0); | |
305 | if (ret) { | |
306 | /* Oops. something got wrong. */ | |
307 | /* Resume and pretend we weren't here. */ | |
100f2341 | 308 | put_chip(map, chip); |
c6826471 AK |
309 | printk(KERN_ERR "%s: suspend operation failed." |
310 | "State may be wrong \n", map->name); | |
311 | return -EIO; | |
312 | } | |
313 | chip->erase_suspended = 1; | |
314 | chip->state = FL_READY; | |
315 | return 0; | |
316 | /* Erase suspend */ | |
317 | case FL_POINT: | |
318 | /* Only if there's no operation suspended... */ | |
319 | if (mode == FL_READY && chip->oldstate == FL_READY) | |
320 | return 0; | |
321 | ||
322 | default: | |
323 | sleep: | |
324 | set_current_state(TASK_UNINTERRUPTIBLE); | |
325 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 326 | mutex_unlock(&chip->mutex); |
c6826471 AK |
327 | schedule(); |
328 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 329 | mutex_lock(&chip->mutex); |
c6826471 AK |
330 | return -EAGAIN; |
331 | } | |
332 | } | |
333 | ||
334 | static void put_chip(struct map_info *map, struct flchip *chip) | |
335 | { | |
336 | if (chip->priv) { | |
337 | struct flchip_shared *shared = chip->priv; | |
8ae66418 | 338 | mutex_lock(&shared->lock); |
c6826471 AK |
339 | if (shared->writing == chip && chip->oldstate == FL_READY) { |
340 | /* We own the ability to write, but we're done */ | |
341 | shared->writing = shared->erasing; | |
342 | if (shared->writing && shared->writing != chip) { | |
343 | /* give back the ownership */ | |
344 | struct flchip *loaner = shared->writing; | |
c4e77376 | 345 | mutex_lock(&loaner->mutex); |
8ae66418 | 346 | mutex_unlock(&shared->lock); |
c4e77376 | 347 | mutex_unlock(&chip->mutex); |
c6826471 | 348 | put_chip(map, loaner); |
c4e77376 SS |
349 | mutex_lock(&chip->mutex); |
350 | mutex_unlock(&loaner->mutex); | |
c6826471 AK |
351 | wake_up(&chip->wq); |
352 | return; | |
353 | } | |
354 | shared->erasing = NULL; | |
355 | shared->writing = NULL; | |
356 | } else if (shared->erasing == chip && shared->writing != chip) { | |
357 | /* | |
358 | * We own the ability to erase without the ability | |
359 | * to write, which means the erase was suspended | |
360 | * and some other partition is currently writing. | |
361 | * Don't let the switch below mess things up since | |
362 | * we don't have ownership to resume anything. | |
363 | */ | |
8ae66418 | 364 | mutex_unlock(&shared->lock); |
c6826471 AK |
365 | wake_up(&chip->wq); |
366 | return; | |
367 | } | |
8ae66418 | 368 | mutex_unlock(&shared->lock); |
c6826471 AK |
369 | } |
370 | ||
371 | switch (chip->oldstate) { | |
372 | case FL_ERASING: | |
c6826471 AK |
373 | map_write(map, CMD(LPDDR_RESUME), |
374 | map->pfow_base + PFOW_COMMAND_CODE); | |
375 | map_write(map, CMD(LPDDR_START_EXECUTION), | |
376 | map->pfow_base + PFOW_COMMAND_EXECUTE); | |
377 | chip->oldstate = FL_READY; | |
378 | chip->state = FL_ERASING; | |
379 | break; | |
380 | case FL_READY: | |
381 | break; | |
382 | default: | |
383 | printk(KERN_ERR "%s: put_chip() called with oldstate %d!\n", | |
384 | map->name, chip->oldstate); | |
385 | } | |
386 | wake_up(&chip->wq); | |
387 | } | |
388 | ||
176e4a23 | 389 | static int do_write_buffer(struct map_info *map, struct flchip *chip, |
c6826471 AK |
390 | unsigned long adr, const struct kvec **pvec, |
391 | unsigned long *pvec_seek, int len) | |
392 | { | |
393 | struct lpddr_private *lpddr = map->fldrv_priv; | |
394 | map_word datum; | |
395 | int ret, wbufsize, word_gap, words; | |
396 | const struct kvec *vec; | |
397 | unsigned long vec_seek; | |
398 | unsigned long prog_buf_ofs; | |
399 | ||
400 | wbufsize = 1 << lpddr->qinfo->BufSizeShift; | |
401 | ||
c4e77376 | 402 | mutex_lock(&chip->mutex); |
c6826471 AK |
403 | ret = get_chip(map, chip, FL_WRITING); |
404 | if (ret) { | |
c4e77376 | 405 | mutex_unlock(&chip->mutex); |
c6826471 AK |
406 | return ret; |
407 | } | |
408 | /* Figure out the number of words to write */ | |
409 | word_gap = (-adr & (map_bankwidth(map)-1)); | |
410 | words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map); | |
411 | if (!word_gap) { | |
412 | words--; | |
413 | } else { | |
414 | word_gap = map_bankwidth(map) - word_gap; | |
415 | adr -= word_gap; | |
416 | datum = map_word_ff(map); | |
417 | } | |
418 | /* Write data */ | |
419 | /* Get the program buffer offset from PFOW register data first*/ | |
420 | prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map, | |
421 | map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET)); | |
422 | vec = *pvec; | |
423 | vec_seek = *pvec_seek; | |
424 | do { | |
425 | int n = map_bankwidth(map) - word_gap; | |
426 | ||
427 | if (n > vec->iov_len - vec_seek) | |
428 | n = vec->iov_len - vec_seek; | |
429 | if (n > len) | |
430 | n = len; | |
431 | ||
432 | if (!word_gap && (len < map_bankwidth(map))) | |
433 | datum = map_word_ff(map); | |
434 | ||
435 | datum = map_word_load_partial(map, datum, | |
436 | vec->iov_base + vec_seek, word_gap, n); | |
437 | ||
438 | len -= n; | |
439 | word_gap += n; | |
440 | if (!len || word_gap == map_bankwidth(map)) { | |
441 | map_write(map, datum, prog_buf_ofs); | |
442 | prog_buf_ofs += map_bankwidth(map); | |
443 | word_gap = 0; | |
444 | } | |
445 | ||
446 | vec_seek += n; | |
447 | if (vec_seek == vec->iov_len) { | |
448 | vec++; | |
449 | vec_seek = 0; | |
450 | } | |
451 | } while (len); | |
452 | *pvec = vec; | |
453 | *pvec_seek = vec_seek; | |
454 | ||
455 | /* GO GO GO */ | |
456 | send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL); | |
457 | chip->state = FL_WRITING; | |
458 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime)); | |
459 | if (ret) { | |
460 | printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n", | |
461 | map->name, ret, adr); | |
462 | goto out; | |
463 | } | |
464 | ||
465 | out: put_chip(map, chip); | |
c4e77376 | 466 | mutex_unlock(&chip->mutex); |
c6826471 AK |
467 | return ret; |
468 | } | |
469 | ||
176e4a23 | 470 | static int do_erase_oneblock(struct mtd_info *mtd, loff_t adr) |
c6826471 AK |
471 | { |
472 | struct map_info *map = mtd->priv; | |
473 | struct lpddr_private *lpddr = map->fldrv_priv; | |
474 | int chipnum = adr >> lpddr->chipshift; | |
475 | struct flchip *chip = &lpddr->chips[chipnum]; | |
476 | int ret; | |
477 | ||
c4e77376 | 478 | mutex_lock(&chip->mutex); |
c6826471 AK |
479 | ret = get_chip(map, chip, FL_ERASING); |
480 | if (ret) { | |
c4e77376 | 481 | mutex_unlock(&chip->mutex); |
c6826471 AK |
482 | return ret; |
483 | } | |
484 | send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL); | |
485 | chip->state = FL_ERASING; | |
486 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000); | |
487 | if (ret) { | |
488 | printk(KERN_WARNING"%s Erase block error %d at : %llx\n", | |
489 | map->name, ret, adr); | |
490 | goto out; | |
491 | } | |
492 | out: put_chip(map, chip); | |
c4e77376 | 493 | mutex_unlock(&chip->mutex); |
c6826471 AK |
494 | return ret; |
495 | } | |
496 | ||
497 | static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len, | |
498 | size_t *retlen, u_char *buf) | |
499 | { | |
500 | struct map_info *map = mtd->priv; | |
501 | struct lpddr_private *lpddr = map->fldrv_priv; | |
502 | int chipnum = adr >> lpddr->chipshift; | |
503 | struct flchip *chip = &lpddr->chips[chipnum]; | |
504 | int ret = 0; | |
505 | ||
c4e77376 | 506 | mutex_lock(&chip->mutex); |
c6826471 AK |
507 | ret = get_chip(map, chip, FL_READY); |
508 | if (ret) { | |
c4e77376 | 509 | mutex_unlock(&chip->mutex); |
c6826471 AK |
510 | return ret; |
511 | } | |
512 | ||
513 | map_copy_from(map, buf, adr, len); | |
514 | *retlen = len; | |
515 | ||
516 | put_chip(map, chip); | |
c4e77376 | 517 | mutex_unlock(&chip->mutex); |
c6826471 AK |
518 | return ret; |
519 | } | |
520 | ||
521 | static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len, | |
522 | size_t *retlen, void **mtdbuf, resource_size_t *phys) | |
523 | { | |
524 | struct map_info *map = mtd->priv; | |
525 | struct lpddr_private *lpddr = map->fldrv_priv; | |
526 | int chipnum = adr >> lpddr->chipshift; | |
527 | unsigned long ofs, last_end = 0; | |
528 | struct flchip *chip = &lpddr->chips[chipnum]; | |
529 | int ret = 0; | |
530 | ||
5def4898 | 531 | if (!map->virt) |
c6826471 AK |
532 | return -EINVAL; |
533 | ||
534 | /* ofs: offset within the first chip that the first read should start */ | |
535 | ofs = adr - (chipnum << lpddr->chipshift); | |
c6826471 | 536 | *mtdbuf = (void *)map->virt + chip->start + ofs; |
c6826471 AK |
537 | |
538 | while (len) { | |
539 | unsigned long thislen; | |
540 | ||
541 | if (chipnum >= lpddr->numchips) | |
542 | break; | |
543 | ||
544 | /* We cannot point across chips that are virtually disjoint */ | |
545 | if (!last_end) | |
546 | last_end = chip->start; | |
547 | else if (chip->start != last_end) | |
548 | break; | |
549 | ||
550 | if ((len + ofs - 1) >> lpddr->chipshift) | |
551 | thislen = (1<<lpddr->chipshift) - ofs; | |
552 | else | |
553 | thislen = len; | |
554 | /* get the chip */ | |
c4e77376 | 555 | mutex_lock(&chip->mutex); |
c6826471 | 556 | ret = get_chip(map, chip, FL_POINT); |
c4e77376 | 557 | mutex_unlock(&chip->mutex); |
c6826471 AK |
558 | if (ret) |
559 | break; | |
560 | ||
561 | chip->state = FL_POINT; | |
562 | chip->ref_point_counter++; | |
563 | *retlen += thislen; | |
564 | len -= thislen; | |
565 | ||
566 | ofs = 0; | |
567 | last_end += 1 << lpddr->chipshift; | |
568 | chipnum++; | |
569 | chip = &lpddr->chips[chipnum]; | |
570 | } | |
571 | return 0; | |
572 | } | |
573 | ||
5e4e6e3f | 574 | static int lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len) |
c6826471 AK |
575 | { |
576 | struct map_info *map = mtd->priv; | |
577 | struct lpddr_private *lpddr = map->fldrv_priv; | |
5e4e6e3f | 578 | int chipnum = adr >> lpddr->chipshift, err = 0; |
c6826471 AK |
579 | unsigned long ofs; |
580 | ||
581 | /* ofs: offset within the first chip that the first read should start */ | |
582 | ofs = adr - (chipnum << lpddr->chipshift); | |
583 | ||
584 | while (len) { | |
585 | unsigned long thislen; | |
586 | struct flchip *chip; | |
587 | ||
588 | chip = &lpddr->chips[chipnum]; | |
589 | if (chipnum >= lpddr->numchips) | |
590 | break; | |
591 | ||
592 | if ((len + ofs - 1) >> lpddr->chipshift) | |
593 | thislen = (1<<lpddr->chipshift) - ofs; | |
594 | else | |
595 | thislen = len; | |
596 | ||
c4e77376 | 597 | mutex_lock(&chip->mutex); |
c6826471 AK |
598 | if (chip->state == FL_POINT) { |
599 | chip->ref_point_counter--; | |
600 | if (chip->ref_point_counter == 0) | |
601 | chip->state = FL_READY; | |
5e4e6e3f | 602 | } else { |
c6826471 AK |
603 | printk(KERN_WARNING "%s: Warning: unpoint called on non" |
604 | "pointed region\n", map->name); | |
5e4e6e3f AB |
605 | err = -EINVAL; |
606 | } | |
c6826471 AK |
607 | |
608 | put_chip(map, chip); | |
c4e77376 | 609 | mutex_unlock(&chip->mutex); |
c6826471 AK |
610 | |
611 | len -= thislen; | |
612 | ofs = 0; | |
613 | chipnum++; | |
614 | } | |
5e4e6e3f AB |
615 | |
616 | return err; | |
c6826471 AK |
617 | } |
618 | ||
619 | static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len, | |
620 | size_t *retlen, const u_char *buf) | |
621 | { | |
622 | struct kvec vec; | |
623 | ||
624 | vec.iov_base = (void *) buf; | |
625 | vec.iov_len = len; | |
626 | ||
627 | return lpddr_writev(mtd, &vec, 1, to, retlen); | |
628 | } | |
629 | ||
630 | ||
631 | static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
632 | unsigned long count, loff_t to, size_t *retlen) | |
633 | { | |
634 | struct map_info *map = mtd->priv; | |
635 | struct lpddr_private *lpddr = map->fldrv_priv; | |
636 | int ret = 0; | |
637 | int chipnum; | |
638 | unsigned long ofs, vec_seek, i; | |
639 | int wbufsize = 1 << lpddr->qinfo->BufSizeShift; | |
c6826471 AK |
640 | size_t len = 0; |
641 | ||
642 | for (i = 0; i < count; i++) | |
643 | len += vecs[i].iov_len; | |
644 | ||
c6826471 AK |
645 | if (!len) |
646 | return 0; | |
647 | ||
648 | chipnum = to >> lpddr->chipshift; | |
649 | ||
650 | ofs = to; | |
651 | vec_seek = 0; | |
652 | ||
653 | do { | |
654 | /* We must not cross write block boundaries */ | |
655 | int size = wbufsize - (ofs & (wbufsize-1)); | |
656 | ||
657 | if (size > len) | |
658 | size = len; | |
659 | ||
660 | ret = do_write_buffer(map, &lpddr->chips[chipnum], | |
661 | ofs, &vecs, &vec_seek, size); | |
662 | if (ret) | |
663 | return ret; | |
664 | ||
665 | ofs += size; | |
666 | (*retlen) += size; | |
667 | len -= size; | |
668 | ||
669 | /* Be nice and reschedule with the chip in a usable | |
670 | * state for other processes */ | |
671 | cond_resched(); | |
672 | ||
673 | } while (len); | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr) | |
679 | { | |
680 | unsigned long ofs, len; | |
681 | int ret; | |
682 | struct map_info *map = mtd->priv; | |
683 | struct lpddr_private *lpddr = map->fldrv_priv; | |
684 | int size = 1 << lpddr->qinfo->UniformBlockSizeShift; | |
685 | ||
686 | ofs = instr->addr; | |
687 | len = instr->len; | |
688 | ||
c6826471 AK |
689 | while (len > 0) { |
690 | ret = do_erase_oneblock(mtd, ofs); | |
691 | if (ret) | |
692 | return ret; | |
693 | ofs += size; | |
694 | len -= size; | |
695 | } | |
696 | instr->state = MTD_ERASE_DONE; | |
697 | mtd_erase_callback(instr); | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | #define DO_XXLOCK_LOCK 1 | |
703 | #define DO_XXLOCK_UNLOCK 2 | |
535ab903 | 704 | static int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk) |
c6826471 AK |
705 | { |
706 | int ret = 0; | |
707 | struct map_info *map = mtd->priv; | |
708 | struct lpddr_private *lpddr = map->fldrv_priv; | |
709 | int chipnum = adr >> lpddr->chipshift; | |
710 | struct flchip *chip = &lpddr->chips[chipnum]; | |
711 | ||
c4e77376 | 712 | mutex_lock(&chip->mutex); |
c6826471 AK |
713 | ret = get_chip(map, chip, FL_LOCKING); |
714 | if (ret) { | |
c4e77376 | 715 | mutex_unlock(&chip->mutex); |
c6826471 AK |
716 | return ret; |
717 | } | |
718 | ||
719 | if (thunk == DO_XXLOCK_LOCK) { | |
720 | send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL); | |
721 | chip->state = FL_LOCKING; | |
722 | } else if (thunk == DO_XXLOCK_UNLOCK) { | |
723 | send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL); | |
724 | chip->state = FL_UNLOCKING; | |
725 | } else | |
726 | BUG(); | |
727 | ||
728 | ret = wait_for_ready(map, chip, 1); | |
729 | if (ret) { | |
730 | printk(KERN_ERR "%s: block unlock error status %d \n", | |
731 | map->name, ret); | |
732 | goto out; | |
733 | } | |
734 | out: put_chip(map, chip); | |
c4e77376 | 735 | mutex_unlock(&chip->mutex); |
c6826471 AK |
736 | return ret; |
737 | } | |
738 | ||
739 | static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
740 | { | |
741 | return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK); | |
742 | } | |
743 | ||
744 | static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
745 | { | |
746 | return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK); | |
747 | } | |
748 | ||
c6826471 AK |
749 | MODULE_LICENSE("GPL"); |
750 | MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>"); | |
751 | MODULE_DESCRIPTION("MTD driver for LPDDR flash chips"); |