Commit | Line | Data |
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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); | |
58 | if (!mtd) { | |
59 | printk(KERN_ERR "Failed to allocate memory for MTD device\n"); | |
60 | return NULL; | |
61 | } | |
62 | mtd->priv = map; | |
63 | mtd->type = MTD_NORFLASH; | |
64 | ||
65 | /* Fill in the default mtd operations */ | |
3c3c10bb | 66 | mtd->_read = lpddr_read; |
c6826471 AK |
67 | mtd->type = MTD_NORFLASH; |
68 | mtd->flags = MTD_CAP_NORFLASH; | |
69 | mtd->flags &= ~MTD_BIT_WRITEABLE; | |
3c3c10bb AB |
70 | mtd->_erase = lpddr_erase; |
71 | mtd->_write = lpddr_write_buffers; | |
72 | mtd->_writev = lpddr_writev; | |
73 | mtd->_lock = lpddr_lock; | |
74 | mtd->_unlock = lpddr_unlock; | |
c6826471 | 75 | if (map_is_linear(map)) { |
3c3c10bb AB |
76 | mtd->_point = lpddr_point; |
77 | mtd->_unpoint = lpddr_unpoint; | |
c6826471 | 78 | } |
c6826471 AK |
79 | mtd->size = 1 << lpddr->qinfo->DevSizeShift; |
80 | mtd->erasesize = 1 << lpddr->qinfo->UniformBlockSizeShift; | |
81 | mtd->writesize = 1 << lpddr->qinfo->BufSizeShift; | |
82 | ||
83 | shared = kmalloc(sizeof(struct flchip_shared) * lpddr->numchips, | |
84 | GFP_KERNEL); | |
85 | if (!shared) { | |
86 | kfree(lpddr); | |
87 | kfree(mtd); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | chip = &lpddr->chips[0]; | |
92 | numchips = lpddr->numchips / lpddr->qinfo->HWPartsNum; | |
93 | for (i = 0; i < numchips; i++) { | |
94 | shared[i].writing = shared[i].erasing = NULL; | |
8ae66418 | 95 | mutex_init(&shared[i].lock); |
c6826471 AK |
96 | for (j = 0; j < lpddr->qinfo->HWPartsNum; j++) { |
97 | *chip = lpddr->chips[i]; | |
98 | chip->start += j << lpddr->chipshift; | |
99 | chip->oldstate = chip->state = FL_READY; | |
100 | chip->priv = &shared[i]; | |
101 | /* those should be reset too since | |
102 | they create memory references. */ | |
103 | init_waitqueue_head(&chip->wq); | |
c4e77376 | 104 | mutex_init(&chip->mutex); |
c6826471 AK |
105 | chip++; |
106 | } | |
107 | } | |
108 | ||
109 | return mtd; | |
110 | } | |
111 | EXPORT_SYMBOL(lpddr_cmdset); | |
112 | ||
113 | static int wait_for_ready(struct map_info *map, struct flchip *chip, | |
114 | unsigned int chip_op_time) | |
115 | { | |
116 | unsigned int timeo, reset_timeo, sleep_time; | |
117 | unsigned int dsr; | |
118 | flstate_t chip_state = chip->state; | |
119 | int ret = 0; | |
120 | ||
121 | /* set our timeout to 8 times the expected delay */ | |
122 | timeo = chip_op_time * 8; | |
123 | if (!timeo) | |
124 | timeo = 500000; | |
125 | reset_timeo = timeo; | |
126 | sleep_time = chip_op_time / 2; | |
127 | ||
128 | for (;;) { | |
129 | dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR)); | |
130 | if (dsr & DSR_READY_STATUS) | |
131 | break; | |
132 | if (!timeo) { | |
133 | printk(KERN_ERR "%s: Flash timeout error state %d \n", | |
134 | map->name, chip_state); | |
135 | ret = -ETIME; | |
136 | break; | |
137 | } | |
138 | ||
139 | /* OK Still waiting. Drop the lock, wait a while and retry. */ | |
c4e77376 | 140 | mutex_unlock(&chip->mutex); |
c6826471 AK |
141 | if (sleep_time >= 1000000/HZ) { |
142 | /* | |
143 | * Half of the normal delay still remaining | |
144 | * can be performed with a sleeping delay instead | |
145 | * of busy waiting. | |
146 | */ | |
147 | msleep(sleep_time/1000); | |
148 | timeo -= sleep_time; | |
149 | sleep_time = 1000000/HZ; | |
150 | } else { | |
151 | udelay(1); | |
152 | cond_resched(); | |
153 | timeo--; | |
154 | } | |
c4e77376 | 155 | mutex_lock(&chip->mutex); |
c6826471 AK |
156 | |
157 | while (chip->state != chip_state) { | |
158 | /* Someone's suspended the operation: sleep */ | |
159 | DECLARE_WAITQUEUE(wait, current); | |
160 | set_current_state(TASK_UNINTERRUPTIBLE); | |
161 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 162 | mutex_unlock(&chip->mutex); |
c6826471 AK |
163 | schedule(); |
164 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 165 | mutex_lock(&chip->mutex); |
c6826471 AK |
166 | } |
167 | if (chip->erase_suspended || chip->write_suspended) { | |
25985edc | 168 | /* Suspend has occurred while sleep: reset timeout */ |
c6826471 AK |
169 | timeo = reset_timeo; |
170 | chip->erase_suspended = chip->write_suspended = 0; | |
171 | } | |
172 | } | |
173 | /* check status for errors */ | |
174 | if (dsr & DSR_ERR) { | |
175 | /* Clear DSR*/ | |
176 | map_write(map, CMD(~(DSR_ERR)), map->pfow_base + PFOW_DSR); | |
177 | printk(KERN_WARNING"%s: Bad status on wait: 0x%x \n", | |
178 | map->name, dsr); | |
179 | print_drs_error(dsr); | |
180 | ret = -EIO; | |
181 | } | |
182 | chip->state = FL_READY; | |
183 | return ret; | |
184 | } | |
185 | ||
186 | static int get_chip(struct map_info *map, struct flchip *chip, int mode) | |
187 | { | |
188 | int ret; | |
189 | DECLARE_WAITQUEUE(wait, current); | |
190 | ||
191 | retry: | |
192 | if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING) | |
193 | && chip->state != FL_SYNCING) { | |
194 | /* | |
195 | * OK. We have possibility for contension on the write/erase | |
196 | * operations which are global to the real chip and not per | |
197 | * partition. So let's fight it over in the partition which | |
198 | * currently has authority on the operation. | |
199 | * | |
200 | * The rules are as follows: | |
201 | * | |
202 | * - any write operation must own shared->writing. | |
203 | * | |
204 | * - any erase operation must own _both_ shared->writing and | |
205 | * shared->erasing. | |
206 | * | |
207 | * - contension arbitration is handled in the owner's context. | |
208 | * | |
209 | * The 'shared' struct can be read and/or written only when | |
210 | * its lock is taken. | |
211 | */ | |
212 | struct flchip_shared *shared = chip->priv; | |
213 | struct flchip *contender; | |
8ae66418 | 214 | mutex_lock(&shared->lock); |
c6826471 AK |
215 | contender = shared->writing; |
216 | if (contender && contender != chip) { | |
217 | /* | |
218 | * The engine to perform desired operation on this | |
219 | * partition is already in use by someone else. | |
220 | * Let's fight over it in the context of the chip | |
221 | * currently using it. If it is possible to suspend, | |
222 | * that other partition will do just that, otherwise | |
223 | * it'll happily send us to sleep. In any case, when | |
224 | * get_chip returns success we're clear to go ahead. | |
225 | */ | |
c4e77376 | 226 | ret = mutex_trylock(&contender->mutex); |
8ae66418 | 227 | mutex_unlock(&shared->lock); |
c6826471 AK |
228 | if (!ret) |
229 | goto retry; | |
c4e77376 | 230 | mutex_unlock(&chip->mutex); |
c6826471 | 231 | ret = chip_ready(map, contender, mode); |
c4e77376 | 232 | mutex_lock(&chip->mutex); |
c6826471 AK |
233 | |
234 | if (ret == -EAGAIN) { | |
c4e77376 | 235 | mutex_unlock(&contender->mutex); |
c6826471 AK |
236 | goto retry; |
237 | } | |
238 | if (ret) { | |
c4e77376 | 239 | mutex_unlock(&contender->mutex); |
c6826471 AK |
240 | return ret; |
241 | } | |
8ae66418 | 242 | mutex_lock(&shared->lock); |
c6826471 AK |
243 | |
244 | /* We should not own chip if it is already in FL_SYNCING | |
245 | * state. Put contender and retry. */ | |
246 | if (chip->state == FL_SYNCING) { | |
247 | put_chip(map, contender); | |
c4e77376 | 248 | mutex_unlock(&contender->mutex); |
c6826471 AK |
249 | goto retry; |
250 | } | |
c4e77376 | 251 | mutex_unlock(&contender->mutex); |
c6826471 AK |
252 | } |
253 | ||
254 | /* Check if we have suspended erase on this chip. | |
255 | Must sleep in such a case. */ | |
256 | if (mode == FL_ERASING && shared->erasing | |
257 | && shared->erasing->oldstate == FL_ERASING) { | |
8ae66418 | 258 | mutex_unlock(&shared->lock); |
c6826471 AK |
259 | set_current_state(TASK_UNINTERRUPTIBLE); |
260 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 261 | mutex_unlock(&chip->mutex); |
c6826471 AK |
262 | schedule(); |
263 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 264 | mutex_lock(&chip->mutex); |
c6826471 AK |
265 | goto retry; |
266 | } | |
267 | ||
268 | /* We now own it */ | |
269 | shared->writing = chip; | |
270 | if (mode == FL_ERASING) | |
271 | shared->erasing = chip; | |
8ae66418 | 272 | mutex_unlock(&shared->lock); |
c6826471 AK |
273 | } |
274 | ||
275 | ret = chip_ready(map, chip, mode); | |
276 | if (ret == -EAGAIN) | |
277 | goto retry; | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int chip_ready(struct map_info *map, struct flchip *chip, int mode) | |
283 | { | |
284 | struct lpddr_private *lpddr = map->fldrv_priv; | |
285 | int ret = 0; | |
286 | DECLARE_WAITQUEUE(wait, current); | |
287 | ||
288 | /* Prevent setting state FL_SYNCING for chip in suspended state. */ | |
289 | if (FL_SYNCING == mode && FL_READY != chip->oldstate) | |
290 | goto sleep; | |
291 | ||
292 | switch (chip->state) { | |
293 | case FL_READY: | |
294 | case FL_JEDEC_QUERY: | |
295 | return 0; | |
296 | ||
297 | case FL_ERASING: | |
298 | if (!lpddr->qinfo->SuspEraseSupp || | |
299 | !(mode == FL_READY || mode == FL_POINT)) | |
300 | goto sleep; | |
301 | ||
302 | map_write(map, CMD(LPDDR_SUSPEND), | |
303 | map->pfow_base + PFOW_PROGRAM_ERASE_SUSPEND); | |
304 | chip->oldstate = FL_ERASING; | |
305 | chip->state = FL_ERASE_SUSPENDING; | |
306 | ret = wait_for_ready(map, chip, 0); | |
307 | if (ret) { | |
308 | /* Oops. something got wrong. */ | |
309 | /* Resume and pretend we weren't here. */ | |
100f2341 | 310 | put_chip(map, chip); |
c6826471 AK |
311 | printk(KERN_ERR "%s: suspend operation failed." |
312 | "State may be wrong \n", map->name); | |
313 | return -EIO; | |
314 | } | |
315 | chip->erase_suspended = 1; | |
316 | chip->state = FL_READY; | |
317 | return 0; | |
318 | /* Erase suspend */ | |
319 | case FL_POINT: | |
320 | /* Only if there's no operation suspended... */ | |
321 | if (mode == FL_READY && chip->oldstate == FL_READY) | |
322 | return 0; | |
323 | ||
324 | default: | |
325 | sleep: | |
326 | set_current_state(TASK_UNINTERRUPTIBLE); | |
327 | add_wait_queue(&chip->wq, &wait); | |
c4e77376 | 328 | mutex_unlock(&chip->mutex); |
c6826471 AK |
329 | schedule(); |
330 | remove_wait_queue(&chip->wq, &wait); | |
c4e77376 | 331 | mutex_lock(&chip->mutex); |
c6826471 AK |
332 | return -EAGAIN; |
333 | } | |
334 | } | |
335 | ||
336 | static void put_chip(struct map_info *map, struct flchip *chip) | |
337 | { | |
338 | if (chip->priv) { | |
339 | struct flchip_shared *shared = chip->priv; | |
8ae66418 | 340 | mutex_lock(&shared->lock); |
c6826471 AK |
341 | if (shared->writing == chip && chip->oldstate == FL_READY) { |
342 | /* We own the ability to write, but we're done */ | |
343 | shared->writing = shared->erasing; | |
344 | if (shared->writing && shared->writing != chip) { | |
345 | /* give back the ownership */ | |
346 | struct flchip *loaner = shared->writing; | |
c4e77376 | 347 | mutex_lock(&loaner->mutex); |
8ae66418 | 348 | mutex_unlock(&shared->lock); |
c4e77376 | 349 | mutex_unlock(&chip->mutex); |
c6826471 | 350 | put_chip(map, loaner); |
c4e77376 SS |
351 | mutex_lock(&chip->mutex); |
352 | mutex_unlock(&loaner->mutex); | |
c6826471 AK |
353 | wake_up(&chip->wq); |
354 | return; | |
355 | } | |
356 | shared->erasing = NULL; | |
357 | shared->writing = NULL; | |
358 | } else if (shared->erasing == chip && shared->writing != chip) { | |
359 | /* | |
360 | * We own the ability to erase without the ability | |
361 | * to write, which means the erase was suspended | |
362 | * and some other partition is currently writing. | |
363 | * Don't let the switch below mess things up since | |
364 | * we don't have ownership to resume anything. | |
365 | */ | |
8ae66418 | 366 | mutex_unlock(&shared->lock); |
c6826471 AK |
367 | wake_up(&chip->wq); |
368 | return; | |
369 | } | |
8ae66418 | 370 | mutex_unlock(&shared->lock); |
c6826471 AK |
371 | } |
372 | ||
373 | switch (chip->oldstate) { | |
374 | case FL_ERASING: | |
c6826471 AK |
375 | map_write(map, CMD(LPDDR_RESUME), |
376 | map->pfow_base + PFOW_COMMAND_CODE); | |
377 | map_write(map, CMD(LPDDR_START_EXECUTION), | |
378 | map->pfow_base + PFOW_COMMAND_EXECUTE); | |
379 | chip->oldstate = FL_READY; | |
380 | chip->state = FL_ERASING; | |
381 | break; | |
382 | case FL_READY: | |
383 | break; | |
384 | default: | |
385 | printk(KERN_ERR "%s: put_chip() called with oldstate %d!\n", | |
386 | map->name, chip->oldstate); | |
387 | } | |
388 | wake_up(&chip->wq); | |
389 | } | |
390 | ||
391 | int do_write_buffer(struct map_info *map, struct flchip *chip, | |
392 | unsigned long adr, const struct kvec **pvec, | |
393 | unsigned long *pvec_seek, int len) | |
394 | { | |
395 | struct lpddr_private *lpddr = map->fldrv_priv; | |
396 | map_word datum; | |
397 | int ret, wbufsize, word_gap, words; | |
398 | const struct kvec *vec; | |
399 | unsigned long vec_seek; | |
400 | unsigned long prog_buf_ofs; | |
401 | ||
402 | wbufsize = 1 << lpddr->qinfo->BufSizeShift; | |
403 | ||
c4e77376 | 404 | mutex_lock(&chip->mutex); |
c6826471 AK |
405 | ret = get_chip(map, chip, FL_WRITING); |
406 | if (ret) { | |
c4e77376 | 407 | mutex_unlock(&chip->mutex); |
c6826471 AK |
408 | return ret; |
409 | } | |
410 | /* Figure out the number of words to write */ | |
411 | word_gap = (-adr & (map_bankwidth(map)-1)); | |
412 | words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map); | |
413 | if (!word_gap) { | |
414 | words--; | |
415 | } else { | |
416 | word_gap = map_bankwidth(map) - word_gap; | |
417 | adr -= word_gap; | |
418 | datum = map_word_ff(map); | |
419 | } | |
420 | /* Write data */ | |
421 | /* Get the program buffer offset from PFOW register data first*/ | |
422 | prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map, | |
423 | map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET)); | |
424 | vec = *pvec; | |
425 | vec_seek = *pvec_seek; | |
426 | do { | |
427 | int n = map_bankwidth(map) - word_gap; | |
428 | ||
429 | if (n > vec->iov_len - vec_seek) | |
430 | n = vec->iov_len - vec_seek; | |
431 | if (n > len) | |
432 | n = len; | |
433 | ||
434 | if (!word_gap && (len < map_bankwidth(map))) | |
435 | datum = map_word_ff(map); | |
436 | ||
437 | datum = map_word_load_partial(map, datum, | |
438 | vec->iov_base + vec_seek, word_gap, n); | |
439 | ||
440 | len -= n; | |
441 | word_gap += n; | |
442 | if (!len || word_gap == map_bankwidth(map)) { | |
443 | map_write(map, datum, prog_buf_ofs); | |
444 | prog_buf_ofs += map_bankwidth(map); | |
445 | word_gap = 0; | |
446 | } | |
447 | ||
448 | vec_seek += n; | |
449 | if (vec_seek == vec->iov_len) { | |
450 | vec++; | |
451 | vec_seek = 0; | |
452 | } | |
453 | } while (len); | |
454 | *pvec = vec; | |
455 | *pvec_seek = vec_seek; | |
456 | ||
457 | /* GO GO GO */ | |
458 | send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL); | |
459 | chip->state = FL_WRITING; | |
460 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime)); | |
461 | if (ret) { | |
462 | printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n", | |
463 | map->name, ret, adr); | |
464 | goto out; | |
465 | } | |
466 | ||
467 | out: put_chip(map, chip); | |
c4e77376 | 468 | mutex_unlock(&chip->mutex); |
c6826471 AK |
469 | return ret; |
470 | } | |
471 | ||
472 | int do_erase_oneblock(struct mtd_info *mtd, loff_t adr) | |
473 | { | |
474 | struct map_info *map = mtd->priv; | |
475 | struct lpddr_private *lpddr = map->fldrv_priv; | |
476 | int chipnum = adr >> lpddr->chipshift; | |
477 | struct flchip *chip = &lpddr->chips[chipnum]; | |
478 | int ret; | |
479 | ||
c4e77376 | 480 | mutex_lock(&chip->mutex); |
c6826471 AK |
481 | ret = get_chip(map, chip, FL_ERASING); |
482 | if (ret) { | |
c4e77376 | 483 | mutex_unlock(&chip->mutex); |
c6826471 AK |
484 | return ret; |
485 | } | |
486 | send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL); | |
487 | chip->state = FL_ERASING; | |
488 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000); | |
489 | if (ret) { | |
490 | printk(KERN_WARNING"%s Erase block error %d at : %llx\n", | |
491 | map->name, ret, adr); | |
492 | goto out; | |
493 | } | |
494 | out: put_chip(map, chip); | |
c4e77376 | 495 | mutex_unlock(&chip->mutex); |
c6826471 AK |
496 | return ret; |
497 | } | |
498 | ||
499 | static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len, | |
500 | size_t *retlen, u_char *buf) | |
501 | { | |
502 | struct map_info *map = mtd->priv; | |
503 | struct lpddr_private *lpddr = map->fldrv_priv; | |
504 | int chipnum = adr >> lpddr->chipshift; | |
505 | struct flchip *chip = &lpddr->chips[chipnum]; | |
506 | int ret = 0; | |
507 | ||
c4e77376 | 508 | mutex_lock(&chip->mutex); |
c6826471 AK |
509 | ret = get_chip(map, chip, FL_READY); |
510 | if (ret) { | |
c4e77376 | 511 | mutex_unlock(&chip->mutex); |
c6826471 AK |
512 | return ret; |
513 | } | |
514 | ||
515 | map_copy_from(map, buf, adr, len); | |
516 | *retlen = len; | |
517 | ||
518 | put_chip(map, chip); | |
c4e77376 | 519 | mutex_unlock(&chip->mutex); |
c6826471 AK |
520 | return ret; |
521 | } | |
522 | ||
523 | static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len, | |
524 | size_t *retlen, void **mtdbuf, resource_size_t *phys) | |
525 | { | |
526 | struct map_info *map = mtd->priv; | |
527 | struct lpddr_private *lpddr = map->fldrv_priv; | |
528 | int chipnum = adr >> lpddr->chipshift; | |
529 | unsigned long ofs, last_end = 0; | |
530 | struct flchip *chip = &lpddr->chips[chipnum]; | |
531 | int ret = 0; | |
532 | ||
5def4898 | 533 | if (!map->virt) |
c6826471 AK |
534 | return -EINVAL; |
535 | ||
536 | /* ofs: offset within the first chip that the first read should start */ | |
537 | ofs = adr - (chipnum << lpddr->chipshift); | |
c6826471 | 538 | *mtdbuf = (void *)map->virt + chip->start + ofs; |
c6826471 AK |
539 | |
540 | while (len) { | |
541 | unsigned long thislen; | |
542 | ||
543 | if (chipnum >= lpddr->numchips) | |
544 | break; | |
545 | ||
546 | /* We cannot point across chips that are virtually disjoint */ | |
547 | if (!last_end) | |
548 | last_end = chip->start; | |
549 | else if (chip->start != last_end) | |
550 | break; | |
551 | ||
552 | if ((len + ofs - 1) >> lpddr->chipshift) | |
553 | thislen = (1<<lpddr->chipshift) - ofs; | |
554 | else | |
555 | thislen = len; | |
556 | /* get the chip */ | |
c4e77376 | 557 | mutex_lock(&chip->mutex); |
c6826471 | 558 | ret = get_chip(map, chip, FL_POINT); |
c4e77376 | 559 | mutex_unlock(&chip->mutex); |
c6826471 AK |
560 | if (ret) |
561 | break; | |
562 | ||
563 | chip->state = FL_POINT; | |
564 | chip->ref_point_counter++; | |
565 | *retlen += thislen; | |
566 | len -= thislen; | |
567 | ||
568 | ofs = 0; | |
569 | last_end += 1 << lpddr->chipshift; | |
570 | chipnum++; | |
571 | chip = &lpddr->chips[chipnum]; | |
572 | } | |
573 | return 0; | |
574 | } | |
575 | ||
5e4e6e3f | 576 | static int lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len) |
c6826471 AK |
577 | { |
578 | struct map_info *map = mtd->priv; | |
579 | struct lpddr_private *lpddr = map->fldrv_priv; | |
5e4e6e3f | 580 | int chipnum = adr >> lpddr->chipshift, err = 0; |
c6826471 AK |
581 | unsigned long ofs; |
582 | ||
583 | /* ofs: offset within the first chip that the first read should start */ | |
584 | ofs = adr - (chipnum << lpddr->chipshift); | |
585 | ||
586 | while (len) { | |
587 | unsigned long thislen; | |
588 | struct flchip *chip; | |
589 | ||
590 | chip = &lpddr->chips[chipnum]; | |
591 | if (chipnum >= lpddr->numchips) | |
592 | break; | |
593 | ||
594 | if ((len + ofs - 1) >> lpddr->chipshift) | |
595 | thislen = (1<<lpddr->chipshift) - ofs; | |
596 | else | |
597 | thislen = len; | |
598 | ||
c4e77376 | 599 | mutex_lock(&chip->mutex); |
c6826471 AK |
600 | if (chip->state == FL_POINT) { |
601 | chip->ref_point_counter--; | |
602 | if (chip->ref_point_counter == 0) | |
603 | chip->state = FL_READY; | |
5e4e6e3f | 604 | } else { |
c6826471 AK |
605 | printk(KERN_WARNING "%s: Warning: unpoint called on non" |
606 | "pointed region\n", map->name); | |
5e4e6e3f AB |
607 | err = -EINVAL; |
608 | } | |
c6826471 AK |
609 | |
610 | put_chip(map, chip); | |
c4e77376 | 611 | mutex_unlock(&chip->mutex); |
c6826471 AK |
612 | |
613 | len -= thislen; | |
614 | ofs = 0; | |
615 | chipnum++; | |
616 | } | |
5e4e6e3f AB |
617 | |
618 | return err; | |
c6826471 AK |
619 | } |
620 | ||
621 | static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len, | |
622 | size_t *retlen, const u_char *buf) | |
623 | { | |
624 | struct kvec vec; | |
625 | ||
626 | vec.iov_base = (void *) buf; | |
627 | vec.iov_len = len; | |
628 | ||
629 | return lpddr_writev(mtd, &vec, 1, to, retlen); | |
630 | } | |
631 | ||
632 | ||
633 | static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
634 | unsigned long count, loff_t to, size_t *retlen) | |
635 | { | |
636 | struct map_info *map = mtd->priv; | |
637 | struct lpddr_private *lpddr = map->fldrv_priv; | |
638 | int ret = 0; | |
639 | int chipnum; | |
640 | unsigned long ofs, vec_seek, i; | |
641 | int wbufsize = 1 << lpddr->qinfo->BufSizeShift; | |
c6826471 AK |
642 | size_t len = 0; |
643 | ||
644 | for (i = 0; i < count; i++) | |
645 | len += vecs[i].iov_len; | |
646 | ||
c6826471 AK |
647 | if (!len) |
648 | return 0; | |
649 | ||
650 | chipnum = to >> lpddr->chipshift; | |
651 | ||
652 | ofs = to; | |
653 | vec_seek = 0; | |
654 | ||
655 | do { | |
656 | /* We must not cross write block boundaries */ | |
657 | int size = wbufsize - (ofs & (wbufsize-1)); | |
658 | ||
659 | if (size > len) | |
660 | size = len; | |
661 | ||
662 | ret = do_write_buffer(map, &lpddr->chips[chipnum], | |
663 | ofs, &vecs, &vec_seek, size); | |
664 | if (ret) | |
665 | return ret; | |
666 | ||
667 | ofs += size; | |
668 | (*retlen) += size; | |
669 | len -= size; | |
670 | ||
671 | /* Be nice and reschedule with the chip in a usable | |
672 | * state for other processes */ | |
673 | cond_resched(); | |
674 | ||
675 | } while (len); | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr) | |
681 | { | |
682 | unsigned long ofs, len; | |
683 | int ret; | |
684 | struct map_info *map = mtd->priv; | |
685 | struct lpddr_private *lpddr = map->fldrv_priv; | |
686 | int size = 1 << lpddr->qinfo->UniformBlockSizeShift; | |
687 | ||
688 | ofs = instr->addr; | |
689 | len = instr->len; | |
690 | ||
c6826471 AK |
691 | while (len > 0) { |
692 | ret = do_erase_oneblock(mtd, ofs); | |
693 | if (ret) | |
694 | return ret; | |
695 | ofs += size; | |
696 | len -= size; | |
697 | } | |
698 | instr->state = MTD_ERASE_DONE; | |
699 | mtd_erase_callback(instr); | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | #define DO_XXLOCK_LOCK 1 | |
705 | #define DO_XXLOCK_UNLOCK 2 | |
706 | int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk) | |
707 | { | |
708 | int ret = 0; | |
709 | struct map_info *map = mtd->priv; | |
710 | struct lpddr_private *lpddr = map->fldrv_priv; | |
711 | int chipnum = adr >> lpddr->chipshift; | |
712 | struct flchip *chip = &lpddr->chips[chipnum]; | |
713 | ||
c4e77376 | 714 | mutex_lock(&chip->mutex); |
c6826471 AK |
715 | ret = get_chip(map, chip, FL_LOCKING); |
716 | if (ret) { | |
c4e77376 | 717 | mutex_unlock(&chip->mutex); |
c6826471 AK |
718 | return ret; |
719 | } | |
720 | ||
721 | if (thunk == DO_XXLOCK_LOCK) { | |
722 | send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL); | |
723 | chip->state = FL_LOCKING; | |
724 | } else if (thunk == DO_XXLOCK_UNLOCK) { | |
725 | send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL); | |
726 | chip->state = FL_UNLOCKING; | |
727 | } else | |
728 | BUG(); | |
729 | ||
730 | ret = wait_for_ready(map, chip, 1); | |
731 | if (ret) { | |
732 | printk(KERN_ERR "%s: block unlock error status %d \n", | |
733 | map->name, ret); | |
734 | goto out; | |
735 | } | |
736 | out: put_chip(map, chip); | |
c4e77376 | 737 | mutex_unlock(&chip->mutex); |
c6826471 AK |
738 | return ret; |
739 | } | |
740 | ||
741 | static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
742 | { | |
743 | return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK); | |
744 | } | |
745 | ||
746 | static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
747 | { | |
748 | return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK); | |
749 | } | |
750 | ||
751 | int word_program(struct map_info *map, loff_t adr, uint32_t curval) | |
752 | { | |
753 | int ret; | |
754 | struct lpddr_private *lpddr = map->fldrv_priv; | |
755 | int chipnum = adr >> lpddr->chipshift; | |
756 | struct flchip *chip = &lpddr->chips[chipnum]; | |
757 | ||
c4e77376 | 758 | mutex_lock(&chip->mutex); |
c6826471 AK |
759 | ret = get_chip(map, chip, FL_WRITING); |
760 | if (ret) { | |
c4e77376 | 761 | mutex_unlock(&chip->mutex); |
c6826471 AK |
762 | return ret; |
763 | } | |
764 | ||
765 | send_pfow_command(map, LPDDR_WORD_PROGRAM, adr, 0x00, (map_word *)&curval); | |
766 | ||
767 | ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->SingleWordProgTime)); | |
768 | if (ret) { | |
769 | printk(KERN_WARNING"%s word_program error at: %llx; val: %x\n", | |
770 | map->name, adr, curval); | |
771 | goto out; | |
772 | } | |
773 | ||
774 | out: put_chip(map, chip); | |
c4e77376 | 775 | mutex_unlock(&chip->mutex); |
c6826471 AK |
776 | return ret; |
777 | } | |
778 | ||
779 | MODULE_LICENSE("GPL"); | |
780 | MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>"); | |
781 | MODULE_DESCRIPTION("MTD driver for LPDDR flash chips"); |