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Merge tag 'sched_ext-for-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[linux-block.git] / drivers / mtd / lpddr / lpddr_cmds.c
CommitLineData
16216333 1// SPDX-License-Identifier: GPL-2.0-or-later
c6826471
AK		 2/*
3 * LPDDR flash memory device operations. This module provides read, write,
4 * erase, lock/unlock support for LPDDR flash memories
5 * (C) 2008 Korolev Alexey <akorolev@infradead.org>
6 * (C) 2008 Vasiliy Leonenko <vasiliy.leonenko@gmail.com>
25985edc 7 * Many thanks to Roman Borisov for initial enabling
c6826471 8 *
c6826471
AK		 9 * TODO:
10 * Implement VPP management
11 * Implement XIP support
12 * Implement OTP support
13 */
14#include <linux/mtd/pfow.h>
15#include <linux/mtd/qinfo.h>
5a0e3ad6 16#include <linux/slab.h>
a0e5cc58 17#include <linux/module.h>
c6826471
AK		 18
19static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
20 size_t *retlen, u_char *buf);
21static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to,
22 size_t len, size_t *retlen, const u_char *buf);
23static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
24 unsigned long count, loff_t to, size_t *retlen);
25static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr);
26static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
27static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
28static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
29 size_t *retlen, void **mtdbuf, resource_size_t *phys);
5e4e6e3f 30static int lpddr_unpoint(struct mtd_info *mtd, loff_t adr, size_t len);
c6826471
AK		 31static int get_chip(struct map_info *map, struct flchip *chip, int mode);
32static int chip_ready(struct map_info *map, struct flchip *chip, int mode);
33static void put_chip(struct map_info *map, struct flchip *chip);
34
35struct mtd_info *lpddr_cmdset(struct map_info *map)
36{
37 struct lpddr_private *lpddr = map->fldrv_priv;
38 struct flchip_shared *shared;
39 struct flchip *chip;
40 struct mtd_info *mtd;
41 int numchips;
42 int i, j;
43
44 mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
54f5a57e 45 if (!mtd)
c6826471 46 return NULL;
c6826471
AK		 47 mtd->priv = map;
48 mtd->type = MTD_NORFLASH;
49
50 /* Fill in the default mtd operations */
3c3c10bb 51 mtd->_read = lpddr_read;
c6826471
AK		 52 mtd->type = MTD_NORFLASH;
53 mtd->flags = MTD_CAP_NORFLASH;
54 mtd->flags &= ~MTD_BIT_WRITEABLE;
3c3c10bb
AB		 55 mtd->_erase = lpddr_erase;
56 mtd->_write = lpddr_write_buffers;
57 mtd->_writev = lpddr_writev;
58 mtd->_lock = lpddr_lock;
59 mtd->_unlock = lpddr_unlock;
c6826471 60 if (map_is_linear(map)) {
3c3c10bb
AB		 61 mtd->_point = lpddr_point;
62 mtd->_unpoint = lpddr_unpoint;
c6826471 63 }
8ffd18a6 64 mtd->size = 1ULL << lpddr->qinfo->DevSizeShift;
c6826471
AK		 65 mtd->erasesize = 1 << lpddr->qinfo->UniformBlockSizeShift;
66 mtd->writesize = 1 << lpddr->qinfo->BufSizeShift;
67
6da2ec56 68 shared = kmalloc_array(lpddr->numchips, sizeof(struct flchip_shared),
c6826471
AK		 69 GFP_KERNEL);
70 if (!shared) {
c6826471
AK		 71 kfree(mtd);
72 return NULL;
73 }
74
75 chip = &lpddr->chips[0];
76 numchips = lpddr->numchips / lpddr->qinfo->HWPartsNum;
77 for (i = 0; i < numchips; i++) {
78 shared[i].writing = shared[i].erasing = NULL;
8ae66418 79 mutex_init(&shared[i].lock);
c6826471
AK		 80 for (j = 0; j < lpddr->qinfo->HWPartsNum; j++) {
81 *chip = lpddr->chips[i];
82 chip->start += j << lpddr->chipshift;
83 chip->oldstate = chip->state = FL_READY;
84 chip->priv = &shared[i];
85 /* those should be reset too since
86 they create memory references. */
87 init_waitqueue_head(&chip->wq);
c4e77376 88 mutex_init(&chip->mutex);
c6826471
AK		 89 chip++;
90 }
91 }
92
93 return mtd;
94}
95EXPORT_SYMBOL(lpddr_cmdset);
96
1a64026e
GS		 97static void print_drs_error(unsigned int dsr)
98{
99 int prog_status = (dsr & DSR_RPS) >> 8;
100
101 if (!(dsr & DSR_AVAILABLE))
102 pr_notice("DSR.15: (0) Device not Available\n");
103 if ((prog_status & 0x03) == 0x03)
104 pr_notice("DSR.9,8: (11) Attempt to program invalid half with 41h command\n");
105 else if (prog_status & 0x02)
106 pr_notice("DSR.9,8: (10) Object Mode Program attempt in region with Control Mode data\n");
107 else if (prog_status & 0x01)
108 pr_notice("DSR.9,8: (01) Program attempt in region with Object Mode data\n");
109 if (!(dsr & DSR_READY_STATUS))
110 pr_notice("DSR.7: (0) Device is Busy\n");
111 if (dsr & DSR_ESS)
112 pr_notice("DSR.6: (1) Erase Suspended\n");
113 if (dsr & DSR_ERASE_STATUS)
114 pr_notice("DSR.5: (1) Erase/Blank check error\n");
115 if (dsr & DSR_PROGRAM_STATUS)
116 pr_notice("DSR.4: (1) Program Error\n");
117 if (dsr & DSR_VPPS)
118 pr_notice("DSR.3: (1) Vpp low detect, operation aborted\n");
119 if (dsr & DSR_PSS)
120 pr_notice("DSR.2: (1) Program suspended\n");
121 if (dsr & DSR_DPS)
122 pr_notice("DSR.1: (1) Aborted Erase/Program attempt on locked block\n");
123}
124
c6826471
AK		 125static int wait_for_ready(struct map_info *map, struct flchip *chip,
126 unsigned int chip_op_time)
127{
128 unsigned int timeo, reset_timeo, sleep_time;
129 unsigned int dsr;
130 flstate_t chip_state = chip->state;
131 int ret = 0;
132
133 /* set our timeout to 8 times the expected delay */
134 timeo = chip_op_time * 8;
135 if (!timeo)
136 timeo = 500000;
137 reset_timeo = timeo;
138 sleep_time = chip_op_time / 2;
139
140 for (;;) {
141 dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR));
142 if (dsr & DSR_READY_STATUS)
143 break;
144 if (!timeo) {
145 printk(KERN_ERR "%s: Flash timeout error state %d \n",
146 map->name, chip_state);
147 ret = -ETIME;
148 break;
149 }
150
151 /* OK Still waiting. Drop the lock, wait a while and retry. */
c4e77376 152 mutex_unlock(&chip->mutex);
c6826471
AK		 153 if (sleep_time >= 1000000/HZ) {
154 /*
155 * Half of the normal delay still remaining
156 * can be performed with a sleeping delay instead
157 * of busy waiting.
158 */
159 msleep(sleep_time/1000);
160 timeo -= sleep_time;
161 sleep_time = 1000000/HZ;
162 } else {
163 udelay(1);
164 cond_resched();
165 timeo--;
166 }
c4e77376 167 mutex_lock(&chip->mutex);
c6826471
AK		 168
169 while (chip->state != chip_state) {
170 /* Someone's suspended the operation: sleep */
171 DECLARE_WAITQUEUE(wait, current);
172 set_current_state(TASK_UNINTERRUPTIBLE);
173 add_wait_queue(&chip->wq, &wait);
c4e77376 174 mutex_unlock(&chip->mutex);
c6826471
AK		 175 schedule();
176 remove_wait_queue(&chip->wq, &wait);
c4e77376 177 mutex_lock(&chip->mutex);
c6826471
AK		 178 }
179 if (chip->erase_suspended || chip->write_suspended) {
25985edc 180 /* Suspend has occurred while sleep: reset timeout */
c6826471
AK		 181 timeo = reset_timeo;
182 chip->erase_suspended = chip->write_suspended = 0;
183 }
184 }
185 /* check status for errors */
186 if (dsr & DSR_ERR) {
187 /* Clear DSR*/
188 map_write(map, CMD(~(DSR_ERR)), map->pfow_base + PFOW_DSR);
189 printk(KERN_WARNING"%s: Bad status on wait: 0x%x \n",
190 map->name, dsr);
191 print_drs_error(dsr);
192 ret = -EIO;
193 }
194 chip->state = FL_READY;
195 return ret;
196}
197
198static int get_chip(struct map_info *map, struct flchip *chip, int mode)
199{
200 int ret;
201 DECLARE_WAITQUEUE(wait, current);
202
203 retry:
204 if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING)
205 && chip->state != FL_SYNCING) {
206 /*
207 * OK. We have possibility for contension on the write/erase
208 * operations which are global to the real chip and not per
209 * partition. So let's fight it over in the partition which
210 * currently has authority on the operation.
211 *
212 * The rules are as follows:
213 *
214 * - any write operation must own shared->writing.
215 *
216 * - any erase operation must own _both_ shared->writing and
217 * shared->erasing.
218 *
219 * - contension arbitration is handled in the owner's context.
220 *
221 * The 'shared' struct can be read and/or written only when
222 * its lock is taken.
223 */
224 struct flchip_shared *shared = chip->priv;
225 struct flchip *contender;
8ae66418 226 mutex_lock(&shared->lock);
c6826471
AK		 227 contender = shared->writing;
228 if (contender && contender != chip) {
229 /*
230 * The engine to perform desired operation on this
231 * partition is already in use by someone else.
232 * Let's fight over it in the context of the chip
233 * currently using it. If it is possible to suspend,
234 * that other partition will do just that, otherwise
235 * it'll happily send us to sleep. In any case, when
236 * get_chip returns success we're clear to go ahead.
237 */
c4e77376 238 ret = mutex_trylock(&contender->mutex);
8ae66418 239 mutex_unlock(&shared->lock);
c6826471
AK		 240 if (!ret)
241 goto retry;
c4e77376 242 mutex_unlock(&chip->mutex);
c6826471 243 ret = chip_ready(map, contender, mode);
c4e77376 244 mutex_lock(&chip->mutex);
c6826471
AK		 245
246 if (ret == -EAGAIN) {
c4e77376 247 mutex_unlock(&contender->mutex);
c6826471
AK		 248 goto retry;
249 }
250 if (ret) {
c4e77376 251 mutex_unlock(&contender->mutex);
c6826471
AK		 252 return ret;
253 }
8ae66418 254 mutex_lock(&shared->lock);
c6826471
AK		 255
256 /* We should not own chip if it is already in FL_SYNCING
257 * state. Put contender and retry. */
258 if (chip->state == FL_SYNCING) {
259 put_chip(map, contender);
c4e77376 260 mutex_unlock(&contender->mutex);
c6826471
AK		 261 goto retry;
262 }
c4e77376 263 mutex_unlock(&contender->mutex);
c6826471
AK		 264 }
265
266 /* Check if we have suspended erase on this chip.
267 Must sleep in such a case. */
268 if (mode == FL_ERASING && shared->erasing
269 && shared->erasing->oldstate == FL_ERASING) {
8ae66418 270 mutex_unlock(&shared->lock);
c6826471
AK		 271 set_current_state(TASK_UNINTERRUPTIBLE);
272 add_wait_queue(&chip->wq, &wait);
c4e77376 273 mutex_unlock(&chip->mutex);
c6826471
AK		 274 schedule();
275 remove_wait_queue(&chip->wq, &wait);
c4e77376 276 mutex_lock(&chip->mutex);
c6826471
AK		 277 goto retry;
278 }
279
280 /* We now own it */
281 shared->writing = chip;
282 if (mode == FL_ERASING)
283 shared->erasing = chip;
8ae66418 284 mutex_unlock(&shared->lock);
c6826471
AK		 285 }
286
287 ret = chip_ready(map, chip, mode);
288 if (ret == -EAGAIN)
289 goto retry;
290
291 return ret;
292}
293
294static int chip_ready(struct map_info *map, struct flchip *chip, int mode)
295{
296 struct lpddr_private *lpddr = map->fldrv_priv;
297 int ret = 0;
298 DECLARE_WAITQUEUE(wait, current);
299
300 /* Prevent setting state FL_SYNCING for chip in suspended state. */
301 if (FL_SYNCING == mode && FL_READY != chip->oldstate)
302 goto sleep;
303
304 switch (chip->state) {
305 case FL_READY:
306 case FL_JEDEC_QUERY:
307 return 0;
308
309 case FL_ERASING:
310 if (!lpddr->qinfo->SuspEraseSupp ||
311 !(mode == FL_READY || mode == FL_POINT))
312 goto sleep;
313
314 map_write(map, CMD(LPDDR_SUSPEND),
315 map->pfow_base + PFOW_PROGRAM_ERASE_SUSPEND);
316 chip->oldstate = FL_ERASING;
317 chip->state = FL_ERASE_SUSPENDING;
318 ret = wait_for_ready(map, chip, 0);
319 if (ret) {
320 /* Oops. something got wrong. */
321 /* Resume and pretend we weren't here. */
100f2341 322 put_chip(map, chip);
c6826471
AK		 323 printk(KERN_ERR "%s: suspend operation failed."
324 "State may be wrong \n", map->name);
325 return -EIO;
326 }
327 chip->erase_suspended = 1;
328 chip->state = FL_READY;
329 return 0;
330 /* Erase suspend */
331 case FL_POINT:
332 /* Only if there's no operation suspended... */
333 if (mode == FL_READY && chip->oldstate == FL_READY)
334 return 0;
025a06c1 335 fallthrough;
c6826471
AK		 336 default:
337sleep:
338 set_current_state(TASK_UNINTERRUPTIBLE);
339 add_wait_queue(&chip->wq, &wait);
c4e77376 340 mutex_unlock(&chip->mutex);
c6826471
AK		 341 schedule();
342 remove_wait_queue(&chip->wq, &wait);
c4e77376 343 mutex_lock(&chip->mutex);
c6826471
AK		 344 return -EAGAIN;
345 }
346}
347
348static void put_chip(struct map_info *map, struct flchip *chip)
349{
350 if (chip->priv) {
351 struct flchip_shared *shared = chip->priv;
8ae66418 352 mutex_lock(&shared->lock);
c6826471
AK		 353 if (shared->writing == chip && chip->oldstate == FL_READY) {
354 /* We own the ability to write, but we're done */
355 shared->writing = shared->erasing;
356 if (shared->writing && shared->writing != chip) {
357 /* give back the ownership */
358 struct flchip *loaner = shared->writing;
c4e77376 359 mutex_lock(&loaner->mutex);
8ae66418 360 mutex_unlock(&shared->lock);
c4e77376 361 mutex_unlock(&chip->mutex);
c6826471 362 put_chip(map, loaner);
c4e77376
SS		 363 mutex_lock(&chip->mutex);
364 mutex_unlock(&loaner->mutex);
c6826471
AK		 365 wake_up(&chip->wq);
366 return;
367 }
368 shared->erasing = NULL;
369 shared->writing = NULL;
370 } else if (shared->erasing == chip && shared->writing != chip) {
371 /*
372 * We own the ability to erase without the ability
373 * to write, which means the erase was suspended
374 * and some other partition is currently writing.
375 * Don't let the switch below mess things up since
376 * we don't have ownership to resume anything.
377 */
8ae66418 378 mutex_unlock(&shared->lock);
c6826471
AK		 379 wake_up(&chip->wq);
380 return;
381 }
8ae66418 382 mutex_unlock(&shared->lock);
c6826471
AK		 383 }
384
385 switch (chip->oldstate) {
386 case FL_ERASING:
c6826471
AK		 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
176e4a23 403static int do_write_buffer(struct map_info *map, struct flchip *chip,
c6826471
AK		 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;
e6026eb0 409 int ret, wbufsize, word_gap;
c6826471
AK		 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));
e6026eb0 424 if (word_gap) {
c6826471
AK		 425 word_gap = map_bankwidth(map) - word_gap;
426 adr -= word_gap;
427 datum = map_word_ff(map);
428 }
429 /* Write data */
430 /* Get the program buffer offset from PFOW register data first*/
431 prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map,
432 map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET));
433 vec = *pvec;
434 vec_seek = *pvec_seek;
435 do {
436 int n = map_bankwidth(map) - word_gap;
437
438 if (n > vec->iov_len - vec_seek)
439 n = vec->iov_len - vec_seek;
440 if (n > len)
441 n = len;
442
443 if (!word_gap && (len < map_bankwidth(map)))
444 datum = map_word_ff(map);
445
446 datum = map_word_load_partial(map, datum,
447 vec->iov_base + vec_seek, word_gap, n);
448
449 len -= n;
450 word_gap += n;
451 if (!len || word_gap == map_bankwidth(map)) {
452 map_write(map, datum, prog_buf_ofs);
453 prog_buf_ofs += map_bankwidth(map);
454 word_gap = 0;
455 }
456
457 vec_seek += n;
458 if (vec_seek == vec->iov_len) {
459 vec++;
460 vec_seek = 0;
461 }
462 } while (len);
463 *pvec = vec;
464 *pvec_seek = vec_seek;
465
466 /* GO GO GO */
467 send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL);
468 chip->state = FL_WRITING;
469 ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime));
470 if (ret) {
471 printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n",
472 map->name, ret, adr);
473 goto out;
474 }
475
476 out: put_chip(map, chip);
c4e77376 477 mutex_unlock(&chip->mutex);
c6826471
AK		 478 return ret;
479}
480
176e4a23 481static int do_erase_oneblock(struct mtd_info *mtd, loff_t adr)
c6826471
AK		 482{
483 struct map_info *map = mtd->priv;
484 struct lpddr_private *lpddr = map->fldrv_priv;
485 int chipnum = adr >> lpddr->chipshift;
486 struct flchip *chip = &lpddr->chips[chipnum];
487 int ret;
488
c4e77376 489 mutex_lock(&chip->mutex);
c6826471
AK		 490 ret = get_chip(map, chip, FL_ERASING);
491 if (ret) {
c4e77376 492 mutex_unlock(&chip->mutex);
c6826471
AK		 493 return ret;
494 }
495 send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL);
496 chip->state = FL_ERASING;
497 ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000);
498 if (ret) {
499 printk(KERN_WARNING"%s Erase block error %d at : %llx\n",
500 map->name, ret, adr);
501 goto out;
502 }
503 out: put_chip(map, chip);
c4e77376 504 mutex_unlock(&chip->mutex);
c6826471
AK		 505 return ret;
506}
507
508static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
509 size_t *retlen, u_char *buf)
510{
511 struct map_info *map = mtd->priv;
512 struct lpddr_private *lpddr = map->fldrv_priv;
513 int chipnum = adr >> lpddr->chipshift;
514 struct flchip *chip = &lpddr->chips[chipnum];
515 int ret = 0;
516
c4e77376 517 mutex_lock(&chip->mutex);
c6826471
AK		 518 ret = get_chip(map, chip, FL_READY);
519 if (ret) {
c4e77376 520 mutex_unlock(&chip->mutex);
c6826471
AK		 521 return ret;
522 }
523
524 map_copy_from(map, buf, adr, len);
525 *retlen = len;
526
527 put_chip(map, chip);
c4e77376 528 mutex_unlock(&chip->mutex);
c6826471
AK		 529 return ret;
530}
531
532static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
533 size_t *retlen, void **mtdbuf, resource_size_t *phys)
534{
535 struct map_info *map = mtd->priv;
536 struct lpddr_private *lpddr = map->fldrv_priv;
537 int chipnum = adr >> lpddr->chipshift;
538 unsigned long ofs, last_end = 0;
539 struct flchip *chip = &lpddr->chips[chipnum];
540 int ret = 0;
541
5def4898 542 if (!map->virt)
c6826471
AK		 543 return -EINVAL;
544
545 /* ofs: offset within the first chip that the first read should start */
546 ofs = adr - (chipnum << lpddr->chipshift);
c6826471 547 *mtdbuf = (void *)map->virt + chip->start + ofs;
c6826471
AK		 548
549 while (len) {
550 unsigned long thislen;
551
552 if (chipnum >= lpddr->numchips)
553 break;
554
555 /* We cannot point across chips that are virtually disjoint */
556 if (!last_end)
557 last_end = chip->start;
558 else if (chip->start != last_end)
559 break;
560
561 if ((len + ofs - 1) >> lpddr->chipshift)
562 thislen = (1<<lpddr->chipshift) - ofs;
563 else
564 thislen = len;
565 /* get the chip */
c4e77376 566 mutex_lock(&chip->mutex);
c6826471 567 ret = get_chip(map, chip, FL_POINT);
c4e77376 568 mutex_unlock(&chip->mutex);
c6826471
AK		 569 if (ret)
570 break;
571
572 chip->state = FL_POINT;
573 chip->ref_point_counter++;
574 *retlen += thislen;
575 len -= thislen;
576
577 ofs = 0;
578 last_end += 1 << lpddr->chipshift;
579 chipnum++;
580 chip = &lpddr->chips[chipnum];
581 }
582 return 0;
583}
584
5e4e6e3f 585static int lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len)
c6826471
AK		 586{
587 struct map_info *map = mtd->priv;
588 struct lpddr_private *lpddr = map->fldrv_priv;
5e4e6e3f 589 int chipnum = adr >> lpddr->chipshift, err = 0;
c6826471
AK		 590 unsigned long ofs;
591
592 /* ofs: offset within the first chip that the first read should start */
593 ofs = adr - (chipnum << lpddr->chipshift);
594
595 while (len) {
596 unsigned long thislen;
597 struct flchip *chip;
598
599 chip = &lpddr->chips[chipnum];
600 if (chipnum >= lpddr->numchips)
601 break;
602
603 if ((len + ofs - 1) >> lpddr->chipshift)
604 thislen = (1<<lpddr->chipshift) - ofs;
605 else
606 thislen = len;
607
c4e77376 608 mutex_lock(&chip->mutex);
c6826471
AK		 609 if (chip->state == FL_POINT) {
610 chip->ref_point_counter--;
611 if (chip->ref_point_counter == 0)
612 chip->state = FL_READY;
5e4e6e3f 613 } else {
c6826471
AK		 614 printk(KERN_WARNING "%s: Warning: unpoint called on non"
615 "pointed region\n", map->name);
5e4e6e3f
AB		 616 err = -EINVAL;
617 }
c6826471
AK		 618
619 put_chip(map, chip);
c4e77376 620 mutex_unlock(&chip->mutex);
c6826471
AK		 621
622 len -= thislen;
623 ofs = 0;
624 chipnum++;
625 }
5e4e6e3f
AB		 626
627 return err;
c6826471
AK		 628}
629
630static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
631 size_t *retlen, const u_char *buf)
632{
633 struct kvec vec;
634
635 vec.iov_base = (void *) buf;
636 vec.iov_len = len;
637
638 return lpddr_writev(mtd, &vec, 1, to, retlen);
639}
640
641
642static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
643 unsigned long count, loff_t to, size_t *retlen)
644{
645 struct map_info *map = mtd->priv;
646 struct lpddr_private *lpddr = map->fldrv_priv;
647 int ret = 0;
648 int chipnum;
649 unsigned long ofs, vec_seek, i;
650 int wbufsize = 1 << lpddr->qinfo->BufSizeShift;
c6826471
AK		 651 size_t len = 0;
652
653 for (i = 0; i < count; i++)
654 len += vecs[i].iov_len;
655
c6826471
AK		 656 if (!len)
657 return 0;
658
659 chipnum = to >> lpddr->chipshift;
660
661 ofs = to;
662 vec_seek = 0;
663
664 do {
665 /* We must not cross write block boundaries */
666 int size = wbufsize - (ofs & (wbufsize-1));
667
668 if (size > len)
669 size = len;
670
671 ret = do_write_buffer(map, &lpddr->chips[chipnum],
672 ofs, &vecs, &vec_seek, size);
673 if (ret)
674 return ret;
675
676 ofs += size;
677 (*retlen) += size;
678 len -= size;
679
680 /* Be nice and reschedule with the chip in a usable
681 * state for other processes */
682 cond_resched();
683
684 } while (len);
685
686 return 0;
687}
688
689static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr)
690{
691 unsigned long ofs, len;
692 int ret;
693 struct map_info *map = mtd->priv;
694 struct lpddr_private *lpddr = map->fldrv_priv;
695 int size = 1 << lpddr->qinfo->UniformBlockSizeShift;
696
697 ofs = instr->addr;
698 len = instr->len;
699
c6826471
AK		 700 while (len > 0) {
701 ret = do_erase_oneblock(mtd, ofs);
702 if (ret)
703 return ret;
704 ofs += size;
705 len -= size;
706 }
c6826471
AK		 707
708 return 0;
709}
710
711#define DO_XXLOCK_LOCK 1
712#define DO_XXLOCK_UNLOCK 2
535ab903 713static int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk)
c6826471
AK		 714{
715 int ret = 0;
716 struct map_info *map = mtd->priv;
717 struct lpddr_private *lpddr = map->fldrv_priv;
718 int chipnum = adr >> lpddr->chipshift;
719 struct flchip *chip = &lpddr->chips[chipnum];
720
c4e77376 721 mutex_lock(&chip->mutex);
c6826471
AK		 722 ret = get_chip(map, chip, FL_LOCKING);
723 if (ret) {
c4e77376 724 mutex_unlock(&chip->mutex);
c6826471
AK		 725 return ret;
726 }
727
728 if (thunk == DO_XXLOCK_LOCK) {
729 send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL);
730 chip->state = FL_LOCKING;
731 } else if (thunk == DO_XXLOCK_UNLOCK) {
732 send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL);
733 chip->state = FL_UNLOCKING;
734 } else
735 BUG();
736
737 ret = wait_for_ready(map, chip, 1);
738 if (ret) {
739 printk(KERN_ERR "%s: block unlock error status %d \n",
740 map->name, ret);
741 goto out;
742 }
743out: put_chip(map, chip);
c4e77376 744 mutex_unlock(&chip->mutex);
c6826471
AK		 745 return ret;
746}
747
748static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
749{
750 return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK);
751}
752
753static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
754{
755 return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK);
756}
757
c6826471
AK		 758MODULE_LICENSE("GPL");
759MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>");
760MODULE_DESCRIPTION("MTD driver for LPDDR flash chips");
Linux 6.x block layer and io_uring tree(s)