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Fix common misspellings
[deliverable/linux.git] / drivers / mtd / lpddr / lpddr_cmds.c
CommitLineData
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
31static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
32 size_t *retlen, u_char *buf);
33static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to,
34 size_t len, size_t *retlen, const u_char *buf);
35static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
36 unsigned long count, loff_t to, size_t *retlen);
37static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr);
38static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
39static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
40static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
41 size_t *retlen, void **mtdbuf, resource_size_t *phys);
42static void lpddr_unpoint(struct mtd_info *mtd, loff_t adr, size_t len);
43static int get_chip(struct map_info *map, struct flchip *chip, int mode);
44static int chip_ready(struct map_info *map, struct flchip *chip, int mode);
45static void put_chip(struct map_info *map, struct flchip *chip);
46
47struct 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}
117EXPORT_SYMBOL(lpddr_cmdset);
118
119static 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
192static 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
288static 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. */
316 map_write(map, CMD(LPDDR_RESUME),
317 map->pfow_base + PFOW_COMMAND_CODE);
318 map_write(map, CMD(LPDDR_START_EXECUTION),
319 map->pfow_base + PFOW_COMMAND_EXECUTE);
320 chip->state = FL_ERASING;
321 chip->oldstate = FL_READY;
322 printk(KERN_ERR "%s: suspend operation failed."
323 "State may be wrong \n", map->name);
324 return -EIO;
325 }
326 chip->erase_suspended = 1;
327 chip->state = FL_READY;
328 return 0;
329 /* Erase suspend */
330 case FL_POINT:
331 /* Only if there's no operation suspended... */
332 if (mode == FL_READY && chip->oldstate == FL_READY)
333 return 0;
334
335 default:
336sleep:
337 set_current_state(TASK_UNINTERRUPTIBLE);
338 add_wait_queue(&chip->wq, &wait);
c4e77376 339 mutex_unlock(&chip->mutex);
c6826471
AK		 340 schedule();
341 remove_wait_queue(&chip->wq, &wait);
c4e77376 342 mutex_lock(&chip->mutex);
c6826471
AK		 343 return -EAGAIN;
344 }
345}
346
347static void put_chip(struct map_info *map, struct flchip *chip)
348{
349 if (chip->priv) {
350 struct flchip_shared *shared = chip->priv;
8ae66418 351 mutex_lock(&shared->lock);
c6826471
AK		 352 if (shared->writing == chip && chip->oldstate == FL_READY) {
353 /* We own the ability to write, but we're done */
354 shared->writing = shared->erasing;
355 if (shared->writing && shared->writing != chip) {
356 /* give back the ownership */
357 struct flchip *loaner = shared->writing;
c4e77376 358 mutex_lock(&loaner->mutex);
8ae66418 359 mutex_unlock(&shared->lock);
c4e77376 360 mutex_unlock(&chip->mutex);
c6826471 361 put_chip(map, loaner);
c4e77376
SS		 362 mutex_lock(&chip->mutex);
363 mutex_unlock(&loaner->mutex);
c6826471
AK		 364 wake_up(&chip->wq);
365 return;
366 }
367 shared->erasing = NULL;
368 shared->writing = NULL;
369 } else if (shared->erasing == chip && shared->writing != chip) {
370 /*
371 * We own the ability to erase without the ability
372 * to write, which means the erase was suspended
373 * and some other partition is currently writing.
374 * Don't let the switch below mess things up since
375 * we don't have ownership to resume anything.
376 */
8ae66418 377 mutex_unlock(&shared->lock);
c6826471
AK		 378 wake_up(&chip->wq);
379 return;
380 }
8ae66418 381 mutex_unlock(&shared->lock);
c6826471
AK		 382 }
383
384 switch (chip->oldstate) {
385 case FL_ERASING:
386 chip->state = chip->oldstate;
387 map_write(map, CMD(LPDDR_RESUME),
388 map->pfow_base + PFOW_COMMAND_CODE);
389 map_write(map, CMD(LPDDR_START_EXECUTION),
390 map->pfow_base + PFOW_COMMAND_EXECUTE);
391 chip->oldstate = FL_READY;
392 chip->state = FL_ERASING;
393 break;
394 case FL_READY:
395 break;
396 default:
397 printk(KERN_ERR "%s: put_chip() called with oldstate %d!\n",
398 map->name, chip->oldstate);
399 }
400 wake_up(&chip->wq);
401}
402
403int do_write_buffer(struct map_info *map, struct flchip *chip,
404 unsigned long adr, const struct kvec **pvec,
405 unsigned long *pvec_seek, int len)
406{
407 struct lpddr_private *lpddr = map->fldrv_priv;
408 map_word datum;
409 int ret, wbufsize, word_gap, words;
410 const struct kvec *vec;
411 unsigned long vec_seek;
412 unsigned long prog_buf_ofs;
413
414 wbufsize = 1 << lpddr->qinfo->BufSizeShift;
415
c4e77376 416 mutex_lock(&chip->mutex);
c6826471
AK		 417 ret = get_chip(map, chip, FL_WRITING);
418 if (ret) {
c4e77376 419 mutex_unlock(&chip->mutex);
c6826471
AK		 420 return ret;
421 }
422 /* Figure out the number of words to write */
423 word_gap = (-adr & (map_bankwidth(map)-1));
424 words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map);
425 if (!word_gap) {
426 words--;
427 } else {
428 word_gap = map_bankwidth(map) - word_gap;
429 adr -= word_gap;
430 datum = map_word_ff(map);
431 }
432 /* Write data */
433 /* Get the program buffer offset from PFOW register data first*/
434 prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map,
435 map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET));
436 vec = *pvec;
437 vec_seek = *pvec_seek;
438 do {
439 int n = map_bankwidth(map) - word_gap;
440
441 if (n > vec->iov_len - vec_seek)
442 n = vec->iov_len - vec_seek;
443 if (n > len)
444 n = len;
445
446 if (!word_gap && (len < map_bankwidth(map)))
447 datum = map_word_ff(map);
448
449 datum = map_word_load_partial(map, datum,
450 vec->iov_base + vec_seek, word_gap, n);
451
452 len -= n;
453 word_gap += n;
454 if (!len || word_gap == map_bankwidth(map)) {
455 map_write(map, datum, prog_buf_ofs);
456 prog_buf_ofs += map_bankwidth(map);
457 word_gap = 0;
458 }
459
460 vec_seek += n;
461 if (vec_seek == vec->iov_len) {
462 vec++;
463 vec_seek = 0;
464 }
465 } while (len);
466 *pvec = vec;
467 *pvec_seek = vec_seek;
468
469 /* GO GO GO */
470 send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL);
471 chip->state = FL_WRITING;
472 ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime));
473 if (ret) {
474 printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n",
475 map->name, ret, adr);
476 goto out;
477 }
478
479 out: put_chip(map, chip);
c4e77376 480 mutex_unlock(&chip->mutex);
c6826471
AK		 481 return ret;
482}
483
484int do_erase_oneblock(struct mtd_info *mtd, loff_t adr)
485{
486 struct map_info *map = mtd->priv;
487 struct lpddr_private *lpddr = map->fldrv_priv;
488 int chipnum = adr >> lpddr->chipshift;
489 struct flchip *chip = &lpddr->chips[chipnum];
490 int ret;
491
c4e77376 492 mutex_lock(&chip->mutex);
c6826471
AK		 493 ret = get_chip(map, chip, FL_ERASING);
494 if (ret) {
c4e77376 495 mutex_unlock(&chip->mutex);
c6826471
AK		 496 return ret;
497 }
498 send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL);
499 chip->state = FL_ERASING;
500 ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000);
501 if (ret) {
502 printk(KERN_WARNING"%s Erase block error %d at : %llx\n",
503 map->name, ret, adr);
504 goto out;
505 }
506 out: put_chip(map, chip);
c4e77376 507 mutex_unlock(&chip->mutex);
c6826471
AK		 508 return ret;
509}
510
511static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
512 size_t *retlen, u_char *buf)
513{
514 struct map_info *map = mtd->priv;
515 struct lpddr_private *lpddr = map->fldrv_priv;
516 int chipnum = adr >> lpddr->chipshift;
517 struct flchip *chip = &lpddr->chips[chipnum];
518 int ret = 0;
519
c4e77376 520 mutex_lock(&chip->mutex);
c6826471
AK		 521 ret = get_chip(map, chip, FL_READY);
522 if (ret) {
c4e77376 523 mutex_unlock(&chip->mutex);
c6826471
AK		 524 return ret;
525 }
526
527 map_copy_from(map, buf, adr, len);
528 *retlen = len;
529
530 put_chip(map, chip);
c4e77376 531 mutex_unlock(&chip->mutex);
c6826471
AK		 532 return ret;
533}
534
535static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
536 size_t *retlen, void **mtdbuf, resource_size_t *phys)
537{
538 struct map_info *map = mtd->priv;
539 struct lpddr_private *lpddr = map->fldrv_priv;
540 int chipnum = adr >> lpddr->chipshift;
541 unsigned long ofs, last_end = 0;
542 struct flchip *chip = &lpddr->chips[chipnum];
543 int ret = 0;
544
545 if (!map->virt || (adr + len > mtd->size))
546 return -EINVAL;
547
548 /* ofs: offset within the first chip that the first read should start */
549 ofs = adr - (chipnum << lpddr->chipshift);
550
551 *mtdbuf = (void *)map->virt + chip->start + ofs;
552 *retlen = 0;
553
554 while (len) {
555 unsigned long thislen;
556
557 if (chipnum >= lpddr->numchips)
558 break;
559
560 /* We cannot point across chips that are virtually disjoint */
561 if (!last_end)
562 last_end = chip->start;
563 else if (chip->start != last_end)
564 break;
565
566 if ((len + ofs - 1) >> lpddr->chipshift)
567 thislen = (1<<lpddr->chipshift) - ofs;
568 else
569 thislen = len;
570 /* get the chip */
c4e77376 571 mutex_lock(&chip->mutex);
c6826471 572 ret = get_chip(map, chip, FL_POINT);
c4e77376 573 mutex_unlock(&chip->mutex);
c6826471
AK		 574 if (ret)
575 break;
576
577 chip->state = FL_POINT;
578 chip->ref_point_counter++;
579 *retlen += thislen;
580 len -= thislen;
581
582 ofs = 0;
583 last_end += 1 << lpddr->chipshift;
584 chipnum++;
585 chip = &lpddr->chips[chipnum];
586 }
587 return 0;
588}
589
590static void lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len)
591{
592 struct map_info *map = mtd->priv;
593 struct lpddr_private *lpddr = map->fldrv_priv;
594 int chipnum = adr >> lpddr->chipshift;
595 unsigned long ofs;
596
597 /* ofs: offset within the first chip that the first read should start */
598 ofs = adr - (chipnum << lpddr->chipshift);
599
600 while (len) {
601 unsigned long thislen;
602 struct flchip *chip;
603
604 chip = &lpddr->chips[chipnum];
605 if (chipnum >= lpddr->numchips)
606 break;
607
608 if ((len + ofs - 1) >> lpddr->chipshift)
609 thislen = (1<<lpddr->chipshift) - ofs;
610 else
611 thislen = len;
612
c4e77376 613 mutex_lock(&chip->mutex);
c6826471
AK		 614 if (chip->state == FL_POINT) {
615 chip->ref_point_counter--;
616 if (chip->ref_point_counter == 0)
617 chip->state = FL_READY;
618 } else
619 printk(KERN_WARNING "%s: Warning: unpoint called on non"
620 "pointed region\n", map->name);
621
622 put_chip(map, chip);
c4e77376 623 mutex_unlock(&chip->mutex);
c6826471
AK		 624
625 len -= thislen;
626 ofs = 0;
627 chipnum++;
628 }
629}
630
631static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
632 size_t *retlen, const u_char *buf)
633{
634 struct kvec vec;
635
636 vec.iov_base = (void *) buf;
637 vec.iov_len = len;
638
639 return lpddr_writev(mtd, &vec, 1, to, retlen);
640}
641
642
643static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
644 unsigned long count, loff_t to, size_t *retlen)
645{
646 struct map_info *map = mtd->priv;
647 struct lpddr_private *lpddr = map->fldrv_priv;
648 int ret = 0;
649 int chipnum;
650 unsigned long ofs, vec_seek, i;
651 int wbufsize = 1 << lpddr->qinfo->BufSizeShift;
652
653 size_t len = 0;
654
655 for (i = 0; i < count; i++)
656 len += vecs[i].iov_len;
657
658 *retlen = 0;
659 if (!len)
660 return 0;
661
662 chipnum = to >> lpddr->chipshift;
663
664 ofs = to;
665 vec_seek = 0;
666
667 do {
668 /* We must not cross write block boundaries */
669 int size = wbufsize - (ofs & (wbufsize-1));
670
671 if (size > len)
672 size = len;
673
674 ret = do_write_buffer(map, &lpddr->chips[chipnum],
675 ofs, &vecs, &vec_seek, size);
676 if (ret)
677 return ret;
678
679 ofs += size;
680 (*retlen) += size;
681 len -= size;
682
683 /* Be nice and reschedule with the chip in a usable
684 * state for other processes */
685 cond_resched();
686
687 } while (len);
688
689 return 0;
690}
691
692static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr)
693{
694 unsigned long ofs, len;
695 int ret;
696 struct map_info *map = mtd->priv;
697 struct lpddr_private *lpddr = map->fldrv_priv;
698 int size = 1 << lpddr->qinfo->UniformBlockSizeShift;
699
700 ofs = instr->addr;
701 len = instr->len;
702
703 if (ofs > mtd->size || (len + ofs) > mtd->size)
704 return -EINVAL;
705
706 while (len > 0) {
707 ret = do_erase_oneblock(mtd, ofs);
708 if (ret)
709 return ret;
710 ofs += size;
711 len -= size;
712 }
713 instr->state = MTD_ERASE_DONE;
714 mtd_erase_callback(instr);
715
716 return 0;
717}
718
719#define DO_XXLOCK_LOCK 1
720#define DO_XXLOCK_UNLOCK 2
721int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk)
722{
723 int ret = 0;
724 struct map_info *map = mtd->priv;
725 struct lpddr_private *lpddr = map->fldrv_priv;
726 int chipnum = adr >> lpddr->chipshift;
727 struct flchip *chip = &lpddr->chips[chipnum];
728
c4e77376 729 mutex_lock(&chip->mutex);
c6826471
AK		 730 ret = get_chip(map, chip, FL_LOCKING);
731 if (ret) {
c4e77376 732 mutex_unlock(&chip->mutex);
c6826471
AK		 733 return ret;
734 }
735
736 if (thunk == DO_XXLOCK_LOCK) {
737 send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL);
738 chip->state = FL_LOCKING;
739 } else if (thunk == DO_XXLOCK_UNLOCK) {
740 send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL);
741 chip->state = FL_UNLOCKING;
742 } else
743 BUG();
744
745 ret = wait_for_ready(map, chip, 1);
746 if (ret) {
747 printk(KERN_ERR "%s: block unlock error status %d \n",
748 map->name, ret);
749 goto out;
750 }
751out: put_chip(map, chip);
c4e77376 752 mutex_unlock(&chip->mutex);
c6826471
AK		 753 return ret;
754}
755
756static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
757{
758 return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK);
759}
760
761static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
762{
763 return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK);
764}
765
766int word_program(struct map_info *map, loff_t adr, uint32_t curval)
767{
768 int ret;
769 struct lpddr_private *lpddr = map->fldrv_priv;
770 int chipnum = adr >> lpddr->chipshift;
771 struct flchip *chip = &lpddr->chips[chipnum];
772
c4e77376 773 mutex_lock(&chip->mutex);
c6826471
AK		 774 ret = get_chip(map, chip, FL_WRITING);
775 if (ret) {
c4e77376 776 mutex_unlock(&chip->mutex);
c6826471
AK		 777 return ret;
778 }
779
780 send_pfow_command(map, LPDDR_WORD_PROGRAM, adr, 0x00, (map_word *)&curval);
781
782 ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->SingleWordProgTime));
783 if (ret) {
784 printk(KERN_WARNING"%s word_program error at: %llx; val: %x\n",
785 map->name, adr, curval);
786 goto out;
787 }
788
789out: put_chip(map, chip);
c4e77376 790 mutex_unlock(&chip->mutex);
c6826471
AK		 791 return ret;
792}
793
794MODULE_LICENSE("GPL");
795MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>");
796MODULE_DESCRIPTION("MTD driver for LPDDR flash chips");
Linux kernel - Deliverables
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