drivers/mtd/lpddr/lpddr_cmds.c

   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>
   6  * Many thanks to Roman Borisov for intial enabling
   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>
  29 #include <linux/slab.h>
  30
  31 static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
  32                                         size_t *retlen, u_char *buf);
  33 static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to,
  34                                 size_t len, size_t *retlen, const u_char *buf);
  35 static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
  36                                 unsigned long count, loff_t to, size_t *retlen);
  37 static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr);
  38 static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
  39 static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
  40 static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
  41                         size_t *retlen, void **mtdbuf, resource_size_t *phys);
  42 static void lpddr_unpoint(struct mtd_info *mtd, loff_t adr, size_t len);
  43 static int get_chip(struct map_info *map, struct flchip *chip, int mode);
  44 static int chip_ready(struct map_info *map, struct flchip *chip, int mode);
  45 static void put_chip(struct map_info *map, struct flchip *chip);
  46
  47 struct mtd_info *lpddr_cmdset(struct map_info *map)
  48 {
  49         struct lpddr_private *lpddr = map->fldrv_priv;
  50         struct flchip_shared *shared;
  51         struct flchip *chip;
  52         struct mtd_info *mtd;
  53         int numchips;
  54         int i, j;
  55
  56         mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
  57         if (!mtd) {
  58                 printk(KERN_ERR "Failed to allocate memory for MTD device\n");
  59                 return NULL;
  60         }
  61         mtd->priv = map;
  62         mtd->type = MTD_NORFLASH;
  63
  64         /* Fill in the default mtd operations */
  65         mtd->read = lpddr_read;
  66         mtd->type = MTD_NORFLASH;
  67         mtd->flags = MTD_CAP_NORFLASH;
  68         mtd->flags &= ~MTD_BIT_WRITEABLE;
  69         mtd->erase = lpddr_erase;
  70         mtd->write = lpddr_write_buffers;
  71         mtd->writev = lpddr_writev;
  72         mtd->read_oob = NULL;
  73         mtd->write_oob = NULL;
  74         mtd->sync = NULL;
  75         mtd->lock = lpddr_lock;
  76         mtd->unlock = lpddr_unlock;
  77         mtd->suspend = NULL;
  78         mtd->resume = NULL;
  79         if (map_is_linear(map)) {
  80                 mtd->point = lpddr_point;
  81                 mtd->unpoint = lpddr_unpoint;
  82         }
  83         mtd->block_isbad = NULL;
  84         mtd->block_markbad = NULL;
  85         mtd->size = 1 << lpddr->qinfo->DevSizeShift;
  86         mtd->erasesize = 1 << lpddr->qinfo->UniformBlockSizeShift;
  87         mtd->writesize = 1 << lpddr->qinfo->BufSizeShift;
  88
  89         shared = kmalloc(sizeof(struct flchip_shared) * lpddr->numchips,
  90                                                 GFP_KERNEL);
  91         if (!shared) {
  92                 kfree(lpddr);
  93                 kfree(mtd);
  94                 return NULL;
  95         }
  96
  97         chip = &lpddr->chips[0];
  98         numchips = lpddr->numchips / lpddr->qinfo->HWPartsNum;
  99         for (i = 0; i < numchips; i++) {
 100                 shared[i].writing = shared[i].erasing = NULL;
 101                 spin_lock_init(&shared[i].lock);
 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);
 110                         spin_lock_init(&chip->_spinlock);
 111                         chip->mutex = &chip->_spinlock;
 112                         chip++;
 113                 }
 114         }
 115
 116         return mtd;
 117 }
 118 EXPORT_SYMBOL(lpddr_cmdset);
 119
 120 static int wait_for_ready(struct map_info *map, struct flchip *chip,
 121                 unsigned int chip_op_time)
 122 {
 123         unsigned int timeo, reset_timeo, sleep_time;
 124         unsigned int dsr;
 125         flstate_t chip_state = chip->state;
 126         int ret = 0;
 127
 128         /* set our timeout to 8 times the expected delay */
 129         timeo = chip_op_time * 8;
 130         if (!timeo)
 131                 timeo = 500000;
 132         reset_timeo = timeo;
 133         sleep_time = chip_op_time / 2;
 134
 135         for (;;) {
 136                 dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR));
 137                 if (dsr & DSR_READY_STATUS)
 138                         break;
 139                 if (!timeo) {
 140                         printk(KERN_ERR "%s: Flash timeout error state %d \n",
 141                                                         map->name, chip_state);
 142                         ret = -ETIME;
 143                         break;
 144                 }
 145
 146                 /* OK Still waiting. Drop the lock, wait a while and retry. */
 147                 spin_unlock(chip->mutex);
 148                 if (sleep_time >= 1000000/HZ) {
 149                         /*
 150                          * Half of the normal delay still remaining
 151                          * can be performed with a sleeping delay instead
 152                          * of busy waiting.
 153                          */
 154                         msleep(sleep_time/1000);
 155                         timeo -= sleep_time;
 156                         sleep_time = 1000000/HZ;
 157                 } else {
 158                         udelay(1);
 159                         cond_resched();
 160                         timeo--;
 161                 }
 162                 spin_lock(chip->mutex);
 163
 164                 while (chip->state != chip_state) {
 165                         /* Someone's suspended the operation: sleep */
 166                         DECLARE_WAITQUEUE(wait, current);
 167                         set_current_state(TASK_UNINTERRUPTIBLE);
 168                         add_wait_queue(&chip->wq, &wait);
 169                         spin_unlock(chip->mutex);
 170                         schedule();
 171                         remove_wait_queue(&chip->wq, &wait);
 172                         spin_lock(chip->mutex);
 173                 }
 174                 if (chip->erase_suspended || chip->write_suspended)  {
 175                         /* Suspend has occured while sleep: reset timeout */
 176                         timeo = reset_timeo;
 177                         chip->erase_suspended = chip->write_suspended = 0;
 178                 }
 179         }
 180         /* check status for errors */
 181         if (dsr & DSR_ERR) {
 182                 /* Clear DSR*/
 183                 map_write(map, CMD(~(DSR_ERR)), map->pfow_base + PFOW_DSR);
 184                 printk(KERN_WARNING"%s: Bad status on wait: 0x%x \n",
 185                                 map->name, dsr);
 186                 print_drs_error(dsr);
 187                 ret = -EIO;
 188         }
 189         chip->state = FL_READY;
 190         return ret;
 191 }
 192
 193 static int get_chip(struct map_info *map, struct flchip *chip, int mode)
 194 {
 195         int ret;
 196         DECLARE_WAITQUEUE(wait, current);
 197
 198  retry:
 199         if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING)
 200                 && chip->state != FL_SYNCING) {
 201                 /*
 202                  * OK. We have possibility for contension on the write/erase
 203                  * operations which are global to the real chip and not per
 204                  * partition.  So let's fight it over in the partition which
 205                  * currently has authority on the operation.
 206                  *
 207                  * The rules are as follows:
 208                  *
 209                  * - any write operation must own shared->writing.
 210                  *
 211                  * - any erase operation must own _both_ shared->writing and
 212                  *   shared->erasing.
 213                  *
 214                  * - contension arbitration is handled in the owner's context.
 215                  *
 216                  * The 'shared' struct can be read and/or written only when
 217                  * its lock is taken.
 218                  */
 219                 struct flchip_shared *shared = chip->priv;
 220                 struct flchip *contender;
 221                 spin_lock(&shared->lock);
 222                 contender = shared->writing;
 223                 if (contender && contender != chip) {
 224                         /*
 225                          * The engine to perform desired operation on this
 226                          * partition is already in use by someone else.
 227                          * Let's fight over it in the context of the chip
 228                          * currently using it.  If it is possible to suspend,
 229                          * that other partition will do just that, otherwise
 230                          * it'll happily send us to sleep.  In any case, when
 231                          * get_chip returns success we're clear to go ahead.
 232                          */
 233                         ret = spin_trylock(contender->mutex);
 234                         spin_unlock(&shared->lock);
 235                         if (!ret)
 236                                 goto retry;
 237                         spin_unlock(chip->mutex);
 238                         ret = chip_ready(map, contender, mode);
 239                         spin_lock(chip->mutex);
 240
 241                         if (ret == -EAGAIN) {
 242                                 spin_unlock(contender->mutex);
 243                                 goto retry;
 244                         }
 245                         if (ret) {
 246                                 spin_unlock(contender->mutex);
 247                                 return ret;
 248                         }
 249                         spin_lock(&shared->lock);
 250
 251                         /* We should not own chip if it is already in FL_SYNCING
 252                          * state. Put contender and retry. */
 253                         if (chip->state == FL_SYNCING) {
 254                                 put_chip(map, contender);
 255                                 spin_unlock(contender->mutex);
 256                                 goto retry;
 257                         }
 258                         spin_unlock(contender->mutex);
 259                 }
 260
 261                 /* Check if we have suspended erase on this chip.
 262                    Must sleep in such a case. */
 263                 if (mode == FL_ERASING && shared->erasing
 264                     && shared->erasing->oldstate == FL_ERASING) {
 265                         spin_unlock(&shared->lock);
 266                         set_current_state(TASK_UNINTERRUPTIBLE);
 267                         add_wait_queue(&chip->wq, &wait);
 268                         spin_unlock(chip->mutex);
 269                         schedule();
 270                         remove_wait_queue(&chip->wq, &wait);
 271                         spin_lock(chip->mutex);
 272                         goto retry;
 273                 }
 274
 275                 /* We now own it */
 276                 shared->writing = chip;
 277                 if (mode == FL_ERASING)
 278                         shared->erasing = chip;
 279                 spin_unlock(&shared->lock);
 280         }
 281
 282         ret = chip_ready(map, chip, mode);
 283         if (ret == -EAGAIN)
 284                 goto retry;
 285
 286         return ret;
 287 }
 288
 289 static int chip_ready(struct map_info *map, struct flchip *chip, int mode)
 290 {
 291         struct lpddr_private *lpddr = map->fldrv_priv;
 292         int ret = 0;
 293         DECLARE_WAITQUEUE(wait, current);
 294
 295         /* Prevent setting state FL_SYNCING for chip in suspended state. */
 296         if (FL_SYNCING == mode && FL_READY != chip->oldstate)
 297                 goto sleep;
 298
 299         switch (chip->state) {
 300         case FL_READY:
 301         case FL_JEDEC_QUERY:
 302                 return 0;
 303
 304         case FL_ERASING:
 305                 if (!lpddr->qinfo->SuspEraseSupp ||
 306                         !(mode == FL_READY || mode == FL_POINT))
 307                         goto sleep;
 308
 309                 map_write(map, CMD(LPDDR_SUSPEND),
 310                         map->pfow_base + PFOW_PROGRAM_ERASE_SUSPEND);
 311                 chip->oldstate = FL_ERASING;
 312                 chip->state = FL_ERASE_SUSPENDING;
 313                 ret = wait_for_ready(map, chip, 0);
 314                 if (ret) {
 315                         /* Oops. something got wrong. */
 316                         /* Resume and pretend we weren't here.  */
 317                         map_write(map, CMD(LPDDR_RESUME),
 318                                 map->pfow_base + PFOW_COMMAND_CODE);
 319                         map_write(map, CMD(LPDDR_START_EXECUTION),
 320                                 map->pfow_base + PFOW_COMMAND_EXECUTE);
 321                         chip->state = FL_ERASING;
 322                         chip->oldstate = FL_READY;
 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;
 335
 336         default:
 337 sleep:
 338                 set_current_state(TASK_UNINTERRUPTIBLE);
 339                 add_wait_queue(&chip->wq, &wait);
 340                 spin_unlock(chip->mutex);
 341                 schedule();
 342                 remove_wait_queue(&chip->wq, &wait);
 343                 spin_lock(chip->mutex);
 344                 return -EAGAIN;
 345         }
 346 }
 347
 348 static void put_chip(struct map_info *map, struct flchip *chip)
 349 {
 350         if (chip->priv) {
 351                 struct flchip_shared *shared = chip->priv;
 352                 spin_lock(&shared->lock);
 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;
 359                                 spin_lock(loaner->mutex);
 360                                 spin_unlock(&shared->lock);
 361                                 spin_unlock(chip->mutex);
 362                                 put_chip(map, loaner);
 363                                 spin_lock(chip->mutex);
 364                                 spin_unlock(loaner->mutex);
 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                          */
 378                         spin_unlock(&shared->lock);
 379                         wake_up(&chip->wq);
 380                         return;
 381                 }
 382                 spin_unlock(&shared->lock);
 383         }
 384
 385         switch (chip->oldstate) {
 386         case FL_ERASING:
 387                 chip->state = chip->oldstate;
 388                 map_write(map, CMD(LPDDR_RESUME),
 389                                 map->pfow_base + PFOW_COMMAND_CODE);
 390                 map_write(map, CMD(LPDDR_START_EXECUTION),
 391                                 map->pfow_base + PFOW_COMMAND_EXECUTE);
 392                 chip->oldstate = FL_READY;
 393                 chip->state = FL_ERASING;
 394                 break;
 395         case FL_READY:
 396                 break;
 397         default:
 398                 printk(KERN_ERR "%s: put_chip() called with oldstate %d!\n",
 399                                 map->name, chip->oldstate);
 400         }
 401         wake_up(&chip->wq);
 402 }
 403
 404 int do_write_buffer(struct map_info *map, struct flchip *chip,
 405                         unsigned long adr, const struct kvec **pvec,
 406                         unsigned long *pvec_seek, int len)
 407 {
 408         struct lpddr_private *lpddr = map->fldrv_priv;
 409         map_word datum;
 410         int ret, wbufsize, word_gap, words;
 411         const struct kvec *vec;
 412         unsigned long vec_seek;
 413         unsigned long prog_buf_ofs;
 414
 415         wbufsize = 1 << lpddr->qinfo->BufSizeShift;
 416
 417         spin_lock(chip->mutex);
 418         ret = get_chip(map, chip, FL_WRITING);
 419         if (ret) {
 420                 spin_unlock(chip->mutex);
 421                 return ret;
 422         }
 423         /* Figure out the number of words to write */
 424         word_gap = (-adr & (map_bankwidth(map)-1));
 425         words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map);
 426         if (!word_gap) {
 427                 words--;
 428         } else {
 429                 word_gap = map_bankwidth(map) - word_gap;
 430                 adr -= word_gap;
 431                 datum = map_word_ff(map);
 432         }
 433         /* Write data */
 434         /* Get the program buffer offset from PFOW register data first*/
 435         prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map,
 436                                 map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET));
 437         vec = *pvec;
 438         vec_seek = *pvec_seek;
 439         do {
 440                 int n = map_bankwidth(map) - word_gap;
 441
 442                 if (n > vec->iov_len - vec_seek)
 443                         n = vec->iov_len - vec_seek;
 444                 if (n > len)
 445                         n = len;
 446
 447                 if (!word_gap && (len < map_bankwidth(map)))
 448                         datum = map_word_ff(map);
 449
 450                 datum = map_word_load_partial(map, datum,
 451                                 vec->iov_base + vec_seek, word_gap, n);
 452
 453                 len -= n;
 454                 word_gap += n;
 455                 if (!len || word_gap == map_bankwidth(map)) {
 456                         map_write(map, datum, prog_buf_ofs);
 457                         prog_buf_ofs += map_bankwidth(map);
 458                         word_gap = 0;
 459                 }
 460
 461                 vec_seek += n;
 462                 if (vec_seek == vec->iov_len) {
 463                         vec++;
 464                         vec_seek = 0;
 465                 }
 466         } while (len);
 467         *pvec = vec;
 468         *pvec_seek = vec_seek;
 469
 470         /* GO GO GO */
 471         send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL);
 472         chip->state = FL_WRITING;
 473         ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime));
 474         if (ret)        {
 475                 printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n",
 476                         map->name, ret, adr);
 477                 goto out;
 478         }
 479
 480  out:   put_chip(map, chip);
 481         spin_unlock(chip->mutex);
 482         return ret;
 483 }
 484
 485 int do_erase_oneblock(struct mtd_info *mtd, loff_t adr)
 486 {
 487         struct map_info *map = mtd->priv;
 488         struct lpddr_private *lpddr = map->fldrv_priv;
 489         int chipnum = adr >> lpddr->chipshift;
 490         struct flchip *chip = &lpddr->chips[chipnum];
 491         int ret;
 492
 493         spin_lock(chip->mutex);
 494         ret = get_chip(map, chip, FL_ERASING);
 495         if (ret) {
 496                 spin_unlock(chip->mutex);
 497                 return ret;
 498         }
 499         send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL);
 500         chip->state = FL_ERASING;
 501         ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000);
 502         if (ret) {
 503                 printk(KERN_WARNING"%s Erase block error %d at : %llx\n",
 504                         map->name, ret, adr);
 505                 goto out;
 506         }
 507  out:   put_chip(map, chip);
 508         spin_unlock(chip->mutex);
 509         return ret;
 510 }
 511
 512 static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
 513                         size_t *retlen, u_char *buf)
 514 {
 515         struct map_info *map = mtd->priv;
 516         struct lpddr_private *lpddr = map->fldrv_priv;
 517         int chipnum = adr >> lpddr->chipshift;
 518         struct flchip *chip = &lpddr->chips[chipnum];
 519         int ret = 0;
 520
 521         spin_lock(chip->mutex);
 522         ret = get_chip(map, chip, FL_READY);
 523         if (ret) {
 524                 spin_unlock(chip->mutex);
 525                 return ret;
 526         }
 527
 528         map_copy_from(map, buf, adr, len);
 529         *retlen = len;
 530
 531         put_chip(map, chip);
 532         spin_unlock(chip->mutex);
 533         return ret;
 534 }
 535
 536 static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
 537                         size_t *retlen, void **mtdbuf, resource_size_t *phys)
 538 {
 539         struct map_info *map = mtd->priv;
 540         struct lpddr_private *lpddr = map->fldrv_priv;
 541         int chipnum = adr >> lpddr->chipshift;
 542         unsigned long ofs, last_end = 0;
 543         struct flchip *chip = &lpddr->chips[chipnum];
 544         int ret = 0;
 545
 546         if (!map->virt || (adr + len > mtd->size))
 547                 return -EINVAL;
 548
 549         /* ofs: offset within the first chip that the first read should start */
 550         ofs = adr - (chipnum << lpddr->chipshift);
 551
 552         *mtdbuf = (void *)map->virt + chip->start + ofs;
 553         *retlen = 0;
 554
 555         while (len) {
 556                 unsigned long thislen;
 557
 558                 if (chipnum >= lpddr->numchips)
 559                         break;
 560
 561                 /* We cannot point across chips that are virtually disjoint */
 562                 if (!last_end)
 563                         last_end = chip->start;
 564                 else if (chip->start != last_end)
 565                         break;
 566
 567                 if ((len + ofs - 1) >> lpddr->chipshift)
 568                         thislen = (1<<lpddr->chipshift) - ofs;
 569                 else
 570                         thislen = len;
 571                 /* get the chip */
 572                 spin_lock(chip->mutex);
 573                 ret = get_chip(map, chip, FL_POINT);
 574                 spin_unlock(chip->mutex);
 575                 if (ret)
 576                         break;
 577
 578                 chip->state = FL_POINT;
 579                 chip->ref_point_counter++;
 580                 *retlen += thislen;
 581                 len -= thislen;
 582
 583                 ofs = 0;
 584                 last_end += 1 << lpddr->chipshift;
 585                 chipnum++;
 586                 chip = &lpddr->chips[chipnum];
 587         }
 588         return 0;
 589 }
 590
 591 static void lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len)
 592 {
 593         struct map_info *map = mtd->priv;
 594         struct lpddr_private *lpddr = map->fldrv_priv;
 595         int chipnum = adr >> lpddr->chipshift;
 596         unsigned long ofs;
 597
 598         /* ofs: offset within the first chip that the first read should start */
 599         ofs = adr - (chipnum << lpddr->chipshift);
 600
 601         while (len) {
 602                 unsigned long thislen;
 603                 struct flchip *chip;
 604
 605                 chip = &lpddr->chips[chipnum];
 606                 if (chipnum >= lpddr->numchips)
 607                         break;
 608
 609                 if ((len + ofs - 1) >> lpddr->chipshift)
 610                         thislen = (1<<lpddr->chipshift) - ofs;
 611                 else
 612                         thislen = len;
 613
 614                 spin_lock(chip->mutex);
 615                 if (chip->state == FL_POINT) {
 616                         chip->ref_point_counter--;
 617                         if (chip->ref_point_counter == 0)
 618                                 chip->state = FL_READY;
 619                 } else
 620                         printk(KERN_WARNING "%s: Warning: unpoint called on non"
 621                                         "pointed region\n", map->name);
 622
 623                 put_chip(map, chip);
 624                 spin_unlock(chip->mutex);
 625
 626                 len -= thislen;
 627                 ofs = 0;
 628                 chipnum++;
 629         }
 630 }
 631
 632 static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
 633                                 size_t *retlen, const u_char *buf)
 634 {
 635         struct kvec vec;
 636
 637         vec.iov_base = (void *) buf;
 638         vec.iov_len = len;
 639
 640         return lpddr_writev(mtd, &vec, 1, to, retlen);
 641 }
 642
 643
 644 static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
 645                                 unsigned long count, loff_t to, size_t *retlen)
 646 {
 647         struct map_info *map = mtd->priv;
 648         struct lpddr_private *lpddr = map->fldrv_priv;
 649         int ret = 0;
 650         int chipnum;
 651         unsigned long ofs, vec_seek, i;
 652         int wbufsize = 1 << lpddr->qinfo->BufSizeShift;
 653
 654         size_t len = 0;
 655
 656         for (i = 0; i < count; i++)
 657                 len += vecs[i].iov_len;
 658
 659         *retlen = 0;
 660         if (!len)
 661                 return 0;
 662
 663         chipnum = to >> lpddr->chipshift;
 664
 665         ofs = to;
 666         vec_seek = 0;
 667
 668         do {
 669                 /* We must not cross write block boundaries */
 670                 int size = wbufsize - (ofs & (wbufsize-1));
 671
 672                 if (size > len)
 673                         size = len;
 674
 675                 ret = do_write_buffer(map, &lpddr->chips[chipnum],
 676                                           ofs, &vecs, &vec_seek, size);
 677                 if (ret)
 678                         return ret;
 679
 680                 ofs += size;
 681                 (*retlen) += size;
 682                 len -= size;
 683
 684                 /* Be nice and reschedule with the chip in a usable
 685                  * state for other processes */
 686                 cond_resched();
 687
 688         } while (len);
 689
 690         return 0;
 691 }
 692
 693 static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr)
 694 {
 695         unsigned long ofs, len;
 696         int ret;
 697         struct map_info *map = mtd->priv;
 698         struct lpddr_private *lpddr = map->fldrv_priv;
 699         int size = 1 << lpddr->qinfo->UniformBlockSizeShift;
 700
 701         ofs = instr->addr;
 702         len = instr->len;
 703
 704         if (ofs > mtd->size || (len + ofs) > mtd->size)
 705                 return -EINVAL;
 706
 707         while (len > 0) {
 708                 ret = do_erase_oneblock(mtd, ofs);
 709                 if (ret)
 710                         return ret;
 711                 ofs += size;
 712                 len -= size;
 713         }
 714         instr->state = MTD_ERASE_DONE;
 715         mtd_erase_callback(instr);
 716
 717         return 0;
 718 }
 719
 720 #define DO_XXLOCK_LOCK          1
 721 #define DO_XXLOCK_UNLOCK        2
 722 int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk)
 723 {
 724         int ret = 0;
 725         struct map_info *map = mtd->priv;
 726         struct lpddr_private *lpddr = map->fldrv_priv;
 727         int chipnum = adr >> lpddr->chipshift;
 728         struct flchip *chip = &lpddr->chips[chipnum];
 729
 730         spin_lock(chip->mutex);
 731         ret = get_chip(map, chip, FL_LOCKING);
 732         if (ret) {
 733                 spin_unlock(chip->mutex);
 734                 return ret;
 735         }
 736
 737         if (thunk == DO_XXLOCK_LOCK) {
 738                 send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL);
 739                 chip->state = FL_LOCKING;
 740         } else if (thunk == DO_XXLOCK_UNLOCK) {
 741                 send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL);
 742                 chip->state = FL_UNLOCKING;
 743         } else
 744                 BUG();
 745
 746         ret = wait_for_ready(map, chip, 1);
 747         if (ret)        {
 748                 printk(KERN_ERR "%s: block unlock error status %d \n",
 749                                 map->name, ret);
 750                 goto out;
 751         }
 752 out:    put_chip(map, chip);
 753         spin_unlock(chip->mutex);
 754         return ret;
 755 }
 756
 757 static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 758 {
 759         return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK);
 760 }
 761
 762 static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 763 {
 764         return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK);
 765 }
 766
 767 int word_program(struct map_info *map, loff_t adr, uint32_t curval)
 768 {
 769     int ret;
 770         struct lpddr_private *lpddr = map->fldrv_priv;
 771         int chipnum = adr >> lpddr->chipshift;
 772         struct flchip *chip = &lpddr->chips[chipnum];
 773
 774         spin_lock(chip->mutex);
 775         ret = get_chip(map, chip, FL_WRITING);
 776         if (ret) {
 777                 spin_unlock(chip->mutex);
 778                 return ret;
 779         }
 780
 781         send_pfow_command(map, LPDDR_WORD_PROGRAM, adr, 0x00, (map_word *)&curval);
 782
 783         ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->SingleWordProgTime));
 784         if (ret)        {
 785                 printk(KERN_WARNING"%s word_program error at: %llx; val: %x\n",
 786                         map->name, adr, curval);
 787                 goto out;
 788         }
 789
 790 out:    put_chip(map, chip);
 791         spin_unlock(chip->mutex);
 792         return ret;
 793 }
 794
 795 MODULE_LICENSE("GPL");
 796 MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>");
 797 MODULE_DESCRIPTION("MTD driver for LPDDR flash chips");