package/linux/kernel-source/drivers/mtd/chips/cfi_cmdset_0701.c

   1 /*
   2  * Common Flash Interface support:
   3  *   SST Standard Vendor Command Set (ID 0x0701)
   4  *
   5  * Copyright (C) 2000 Crossnet Co. <info@crossnet.co.jp>
   6  *
   7  * 2_by_8 routines added by Simon Munton
   8  *
   9  * This code is GPL
  10  *
  11  * $Id$
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <asm/io.h>
  20 #include <asm/byteorder.h>
  21
  22 #include <linux/errno.h>
  23 #include <linux/slab.h>
  24 #include <linux/delay.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/mtd/map.h>
  27 #include <linux/mtd/cfi.h>
  28
  29 static int cfi_sststd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
  30 static int cfi_sststd_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
  31 static int cfi_sststd_erase_onesize(struct mtd_info *, struct erase_info *);
  32 static int cfi_sststd_erase_varsize(struct mtd_info *, struct erase_info *);
  33 static void cfi_sststd_sync (struct mtd_info *);
  34 static int cfi_sststd_suspend (struct mtd_info *);
  35 static void cfi_sststd_resume (struct mtd_info *);
  36
  37 static void cfi_sststd_destroy(struct mtd_info *);
  38
  39 struct mtd_info *cfi_cmdset_0701(struct map_info *, int);
  40 static struct mtd_info *cfi_sststd_setup (struct map_info *);
  41
  42
  43 static struct mtd_chip_driver cfi_sststd_chipdrv = {
  44         probe: NULL, /* Not usable directly */
  45         destroy: cfi_sststd_destroy,
  46         name: "cfi_cmdset_0701",
  47         module: THIS_MODULE
  48 };
  49
  50 struct mtd_info *cfi_cmdset_0701(struct map_info *map, int primary)
  51 {
  52         struct cfi_private *cfi = map->fldrv_priv;
  53         int ofs_factor = cfi->interleave * cfi->device_type;
  54         int i;
  55         __u8 major, minor;
  56         __u32 base = cfi->chips[0].start;
  57
  58         if (cfi->cfi_mode==1){
  59                 __u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
  60
  61                 cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
  62                 cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
  63                 cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);
  64
  65                 major = cfi_read_query(map, base + (adr+3)*ofs_factor);
  66                 minor = cfi_read_query(map, base + (adr+4)*ofs_factor);
  67
  68                 printk(" SST Query Table v%c.%c at 0x%4.4X\n",
  69                        major, minor, adr);
  70                 cfi_send_gen_cmd(0xf0, 0x5555, base, map, cfi, cfi->device_type, NULL);
  71
  72                 cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
  73                 cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
  74                 cfi_send_gen_cmd(0x90, 0x5555, base, map, cfi, cfi->device_type, NULL);
  75                 cfi->mfr = cfi_read_query(map, base);
  76                 cfi->id = cfi_read_query(map, base + ofs_factor);
  77
  78                 cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);
  79                 cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);
  80                 cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);
  81
  82                 switch (cfi->device_type) {
  83                 case CFI_DEVICETYPE_X16:
  84                         cfi->addr_unlock1 = 0x5555;
  85                         cfi->addr_unlock2 = 0x2AAA;
  86                         break;
  87                 default:
  88                         printk(KERN_NOTICE "Eep. Unknown cfi_cmdset_0701 device type %d\n", cfi->device_type);
  89                         return NULL;
  90                 }
  91         } /* CFI mode */
  92
  93         for (i=0; i< cfi->numchips; i++) {
  94                 cfi->chips[i].word_write_time = 1<<cfi->cfiq->WordWriteTimeoutTyp;
  95                 cfi->chips[i].buffer_write_time = 1<<cfi->cfiq->BufWriteTimeoutTyp;
  96                 cfi->chips[i].erase_time = 1<<cfi->cfiq->BlockEraseTimeoutTyp;
  97         }
  98
  99         map->fldrv = &cfi_sststd_chipdrv;
 100         MOD_INC_USE_COUNT;
 101
 102         cfi_send_gen_cmd(0xf0, 0x5555, base, map, cfi, cfi->device_type, NULL);
 103         return cfi_sststd_setup(map);
 104 }
 105
 106 static struct mtd_info *cfi_sststd_setup(struct map_info *map)
 107 {
 108         struct cfi_private *cfi = map->fldrv_priv;
 109         struct mtd_info *mtd;
 110         unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;
 111
 112         mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
 113         printk("number of %s chips: %d\n", (cfi->cfi_mode)?"JEDEC":"CFI",cfi->numchips);
 114
 115         if (!mtd) {
 116           printk("Failed to allocate memory for MTD device\n");
 117           kfree(cfi->cmdset_priv);
 118           return NULL;
 119         }
 120
 121         memset(mtd, 0, sizeof(*mtd));
 122         mtd->priv = map;
 123         mtd->type = MTD_NORFLASH;
 124         /* Also select the correct geometry setup too */
 125         mtd->size = devsize * cfi->numchips;
 126
 127         if (cfi->cfiq->NumEraseRegions == 1) {
 128                 /* No need to muck about with multiple erase sizes */
 129                 mtd->erasesize = ((cfi->cfiq->EraseRegionInfo[0] >> 8) & ~0xff) * cfi->interleave;
 130         } else {
 131                 unsigned long offset = 0;
 132                 int i,j;
 133
 134                 mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
 135                 mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info) * mtd->numeraseregions, GFP_KERNEL);
 136                 if (!mtd->eraseregions) {
 137                         printk("Failed to allocate memory for MTD erase region info\n");
 138                         kfree(cfi->cmdset_priv);
 139                         return NULL;
 140                 }
 141
 142                 for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
 143                         unsigned long ernum, ersize;
 144                         ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave;
 145                         ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1;
 146
 147                         if (mtd->erasesize < ersize) {
 148                                 mtd->erasesize = ersize;
 149                         }
 150                         for (j=0; j<cfi->numchips; j++) {
 151                                 mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset;
 152                                 mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
 153                                 mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
 154                         }
 155                         offset += (ersize * ernum);
 156                 }
 157
 158                 // debug
 159                 for (i=0; i<mtd->numeraseregions;i++){
 160                         printk("%d: offset=0x%x,size=0x%x,blocks=%d\n",
 161                                i,mtd->eraseregions[i].offset,
 162                                mtd->eraseregions[i].erasesize,
 163                                mtd->eraseregions[i].numblocks);
 164                 }
 165         }
 166
 167         switch (CFIDEV_BUSWIDTH)
 168         {
 169         case 1:
 170         case 2:
 171         case 4:
 172                 if (mtd->numeraseregions > 1)
 173                         mtd->erase = cfi_sststd_erase_varsize;
 174                 else
 175                         mtd->erase = cfi_sststd_erase_onesize;
 176                 mtd->read = cfi_sststd_read;
 177                 mtd->write = cfi_sststd_write;
 178                 break;
 179
 180         default:
 181                 printk("Unsupported buswidth\n");
 182                 kfree(mtd);
 183                 kfree(cfi->cmdset_priv);
 184                 return NULL;
 185                 break;
 186         }
 187         mtd->sync = cfi_sststd_sync;
 188         mtd->suspend = cfi_sststd_suspend;
 189         mtd->resume = cfi_sststd_resume;
 190         mtd->flags = MTD_CAP_NORFLASH;
 191         map->fldrv = &cfi_sststd_chipdrv;
 192         mtd->name = map->name;
 193         MOD_INC_USE_COUNT;
 194         return mtd;
 195 }
 196
 197 static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
 198 {
 199         DECLARE_WAITQUEUE(wait, current);
 200         unsigned long timeo = jiffies + HZ;
 201
 202  retry:
 203         cfi_spin_lock(chip->mutex);
 204
 205         if (chip->state != FL_READY){
 206                 printk("Waiting for chip to read, status = %d\n", chip->state);
 207                 set_current_state(TASK_UNINTERRUPTIBLE);
 208                 add_wait_queue(&chip->wq, &wait);
 209
 210                 cfi_spin_unlock(chip->mutex);
 211
 212                 schedule();
 213                 remove_wait_queue(&chip->wq, &wait);
 214                 timeo = jiffies + HZ;
 215
 216                 goto retry;
 217         }
 218
 219         adr += chip->start;
 220
 221         chip->state = FL_READY;
 222
 223         map->copy_from(map, buf, adr, len);
 224
 225         wake_up(&chip->wq);
 226         cfi_spin_unlock(chip->mutex);
 227
 228         return 0;
 229 }
 230
 231 static int cfi_sststd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
 232 {
 233         struct map_info *map = mtd->priv;
 234         struct cfi_private *cfi = map->fldrv_priv;
 235         unsigned long ofs;
 236         int chipnum;
 237         int ret = 0;
 238
 239         /* ofs: offset within the first chip that the first read should start */
 240
 241         chipnum = (from >> cfi->chipshift);
 242         ofs = from - (chipnum <<  cfi->chipshift);
 243
 244
 245         *retlen = 0;
 246
 247         while (len) {
 248                 unsigned long thislen;
 249
 250                 if (chipnum >= cfi->numchips)
 251                         break;
 252
 253                 if ((len + ofs -1) >> cfi->chipshift)
 254                         thislen = (1<<cfi->chipshift) - ofs;
 255                 else
 256                         thislen = len;
 257
 258                 ret = do_read_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf);
 259                 if (ret)
 260                         break;
 261
 262                 *retlen += thislen;
 263                 len -= thislen;
 264                 buf += thislen;
 265
 266                 ofs = 0;
 267                 chipnum++;
 268         }
 269         return ret;
 270 }
 271
 272 static int do_write_oneword(struct map_info *map, struct flchip *chip, unsigned long adr, __u32 datum, int fast)
 273 {
 274         unsigned long timeo = jiffies + HZ;
 275         unsigned int Last[4];
 276         unsigned long Count = 0;
 277         struct cfi_private *cfi = map->fldrv_priv;
 278         DECLARE_WAITQUEUE(wait, current);
 279         int ret = 0;
 280
 281  retry:
 282         cfi_spin_lock(chip->mutex);
 283
 284         if (chip->state != FL_READY){
 285                 printk("Waiting for chip to write, status = %d\n", chip->state);
 286                 set_current_state(TASK_UNINTERRUPTIBLE);
 287                 add_wait_queue(&chip->wq, &wait);
 288
 289                 cfi_spin_unlock(chip->mutex);
 290
 291                 schedule();
 292                 remove_wait_queue(&chip->wq, &wait);
 293                 printk("Wake up to write:\n");
 294                 timeo = jiffies + HZ;
 295
 296                 goto retry;
 297         }
 298
 299         chip->state = FL_WRITING;
 300
 301         adr += chip->start;
 302         ENABLE_VPP(map);
 303     cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 304     cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 305     cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 306
 307         cfi_write(map, datum, adr);
 308
 309         cfi_spin_unlock(chip->mutex);
 310         cfi_udelay(chip->word_write_time);
 311         cfi_spin_lock(chip->mutex);
 312
 313         Last[0] = cfi_read(map, adr);
 314         //      printk("Last[0] is %x\n", Last[0]);
 315         Last[1] = cfi_read(map, adr);
 316         //      printk("Last[1] is %x\n", Last[1]);
 317         Last[2] = cfi_read(map, adr);
 318         //      printk("Last[2] is %x\n", Last[2]);
 319
 320         for (Count = 3; Last[(Count - 1) % 4] != Last[(Count - 2) % 4] && Count < 10000; Count++){
 321                 cfi_spin_unlock(chip->mutex);
 322                 cfi_udelay(10);
 323                 cfi_spin_lock(chip->mutex);
 324
 325                 Last[Count % 4] = cfi_read(map, adr);
 326                 //              printk("Last[%d%%4] is %x\n", Count, Last[Count%4]);
 327         }
 328
 329         if (Last[(Count - 1) % 4] != datum){
 330                 printk("Last[%ld] is %x, datum is %x\n",(Count - 1) % 4,Last[(Count - 1) % 4],datum);
 331                 cfi_send_gen_cmd(0xF0, 0, chip->start, map, cfi, cfi->device_type, NULL);
 332                 DISABLE_VPP(map);
 333                 ret = -EIO;
 334         }
 335         DISABLE_VPP(map);
 336         chip->state = FL_READY;
 337         wake_up(&chip->wq);
 338         cfi_spin_unlock(chip->mutex);
 339
 340         return ret;
 341 }
 342
 343 static int cfi_sststd_write (struct mtd_info *mtd, loff_t to , size_t len, size_t *retlen, const u_char *buf)
 344 {
 345         struct map_info *map = mtd->priv;
 346         struct cfi_private *cfi = map->fldrv_priv;
 347         int ret = 0;
 348         int chipnum;
 349         unsigned long ofs, chipstart;
 350
 351         *retlen = 0;
 352         if (!len)
 353                 return 0;
 354
 355         chipnum = to >> cfi->chipshift;
 356         ofs = to  - (chipnum << cfi->chipshift);
 357         chipstart = cfi->chips[chipnum].start;
 358
 359         /* If it's not bus-aligned, do the first byte write */
 360         if (ofs & (CFIDEV_BUSWIDTH-1)) {
 361                 unsigned long bus_ofs = ofs & ~(CFIDEV_BUSWIDTH-1);
 362                 int i = ofs - bus_ofs;
 363                 int n = 0;
 364                 u_char tmp_buf[4];
 365                 __u32 datum;
 366
 367                 map->copy_from(map, tmp_buf, bus_ofs + cfi->chips[chipnum].start, CFIDEV_BUSWIDTH);
 368                 while (len && i < CFIDEV_BUSWIDTH)
 369                         tmp_buf[i++] = buf[n++], len--;
 370
 371                 if (cfi_buswidth_is_2()) {
 372                         datum = *(__u16*)tmp_buf;
 373                 } else if (cfi_buswidth_is_4()) {
 374                         datum = *(__u32*)tmp_buf;
 375                 } else {
 376                         return -EINVAL;  /* should never happen, but be safe */
 377                 }
 378
 379                 ret = do_write_oneword(map, &cfi->chips[chipnum],
 380                                 bus_ofs, datum, 0);
 381                 if (ret)
 382                         return ret;
 383
 384                 ofs += n;
 385                 buf += n;
 386                 (*retlen) += n;
 387
 388                 if (ofs >> cfi->chipshift) {
 389                         chipnum ++;
 390                         ofs = 0;
 391                         if (chipnum == cfi->numchips)
 392                                 return 0;
 393                 }
 394         }
 395
 396         /* We are now aligned, write as much as possible */
 397         while(len >= CFIDEV_BUSWIDTH) {
 398                 __u32 datum;
 399
 400                 if (cfi_buswidth_is_1()) {
 401                         datum = *(__u8*)buf;
 402                 } else if (cfi_buswidth_is_2()) {
 403                         datum = *(__u16*)buf;
 404                 } else if (cfi_buswidth_is_4()) {
 405                         datum = *(__u32*)buf;
 406                 } else {
 407                         return -EINVAL;
 408                 }
 409                 ret = do_write_oneword(map, &cfi->chips[chipnum],
 410                                        ofs, datum, cfi->fast_prog);
 411                 if (ret) {
 412                         return ret;
 413                 }
 414
 415                 ofs += CFIDEV_BUSWIDTH;
 416                 buf += CFIDEV_BUSWIDTH;
 417                 (*retlen) += CFIDEV_BUSWIDTH;
 418                 len -= CFIDEV_BUSWIDTH;
 419
 420                 if (ofs >> cfi->chipshift) {
 421                         chipnum ++;
 422                         ofs = 0;
 423                         if (chipnum == cfi->numchips)
 424                                 return 0;
 425                         chipstart = cfi->chips[chipnum].start;
 426                 }
 427         }
 428
 429         if (len & (CFIDEV_BUSWIDTH-1)) {
 430                 int i = 0, n = 0;
 431                 u_char tmp_buf[4];
 432                 __u32 datum;
 433
 434                 map->copy_from(map, tmp_buf, ofs + cfi->chips[chipnum].start, CFIDEV_BUSWIDTH);
 435                 while (len--)
 436                         tmp_buf[i++] = buf[n++];
 437
 438                 if (cfi_buswidth_is_2()) {
 439                         datum = *(__u16*)tmp_buf;
 440                 } else if (cfi_buswidth_is_4()) {
 441                         datum = *(__u32*)tmp_buf;
 442                 } else {
 443                         return -EINVAL;  /* should never happen, but be safe */
 444                 }
 445
 446                 ret = do_write_oneword(map, &cfi->chips[chipnum],
 447                                 ofs, datum, 0);
 448                 if (ret)
 449                         return ret;
 450
 451                 (*retlen) += n;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static inline int do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
 458 {
 459         unsigned int status;
 460         unsigned long timeo = jiffies + HZ;
 461         struct cfi_private *cfi = map->fldrv_priv;
 462         unsigned int rdy_mask;
 463         DECLARE_WAITQUEUE(wait, current);
 464
 465  retry:
 466         cfi_spin_lock(chip->mutex);
 467
 468         if (chip->state != FL_READY){
 469                 set_current_state(TASK_UNINTERRUPTIBLE);
 470                 add_wait_queue(&chip->wq, &wait);
 471
 472                 cfi_spin_unlock(chip->mutex);
 473
 474                 schedule();
 475                 remove_wait_queue(&chip->wq, &wait);
 476                 timeo = jiffies + HZ;
 477
 478                 goto retry;
 479         }
 480
 481         chip->state = FL_ERASING;
 482
 483         adr += chip->start;
 484         ENABLE_VPP(map);
 485         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 486         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 487         cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 488         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 489         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, CFI_DEVICETYPE_X16, NULL);
 490         cfi_write(map, CMD(0x30), adr);
 491
 492         timeo = jiffies + (HZ*20);
 493
 494         cfi_spin_unlock(chip->mutex);
 495         schedule_timeout(HZ);
 496         cfi_spin_lock(chip->mutex);
 497
 498         rdy_mask = CMD(0x80);
 499
 500         /* Once the state machine's known to be working I'll do that */
 501
 502         while ( ( (status = cfi_read(map,adr)) & rdy_mask ) != rdy_mask ) {
 503                 static int z=0;
 504
 505                 if (chip->state != FL_ERASING) {
 506                         /* Someone's suspended the erase. Sleep */
 507                         set_current_state(TASK_UNINTERRUPTIBLE);
 508                         add_wait_queue(&chip->wq, &wait);
 509
 510                         cfi_spin_unlock(chip->mutex);
 511                         printk("erase suspended. Sleeping\n");
 512
 513                         schedule();
 514                         remove_wait_queue(&chip->wq, &wait);
 515                         timeo = jiffies + (HZ*2);
 516                         cfi_spin_lock(chip->mutex);
 517                         continue;
 518                 }
 519
 520                 /* OK Still waiting */
 521                 if (time_after(jiffies, timeo)) {
 522                         chip->state = FL_READY;
 523                         cfi_spin_unlock(chip->mutex);
 524                         printk("waiting for erase to complete timed out.");
 525                         DISABLE_VPP(map);
 526                         return -EIO;
 527                 }
 528
 529                 /* Latency issues. Drop the lock, wait a while and retry */
 530                 cfi_spin_unlock(chip->mutex);
 531
 532                 z++;
 533                 if ( 0 && !(z % 100 ))
 534                         printk("chip not ready yet after erase. looping\n");
 535
 536                 cfi_udelay(1);
 537
 538                 cfi_spin_lock(chip->mutex);
 539                 continue;
 540         }
 541
 542         /* Done and happy. */
 543         DISABLE_VPP(map);
 544         chip->state = FL_READY;
 545         wake_up(&chip->wq);
 546         cfi_spin_unlock(chip->mutex);
 547         return 0;
 548 }
 549
 550 static int cfi_sststd_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
 551 {
 552         struct map_info *map = mtd->priv;
 553         struct cfi_private *cfi = map->fldrv_priv;
 554         unsigned long adr, len;
 555         int chipnum, ret = 0;
 556         int i, first;
 557         struct mtd_erase_region_info *regions = mtd->eraseregions;
 558
 559         if (instr->addr > mtd->size)
 560                 return -EINVAL;
 561
 562         if ((instr->len + instr->addr) > mtd->size)
 563                 return -EINVAL;
 564
 565         /* Check that both start and end of the requested erase are
 566          * aligned with the erasesize at the appropriate addresses.
 567          */
 568
 569         i = 0;
 570
 571         /* Skip all erase regions which are ended before the start of
 572            the requested erase. Actually, to save on the calculations,
 573            we skip to the first erase region which starts after the
 574            start of the requested erase, and then go back one.
 575         */
 576
 577         while (i < mtd->numeraseregions && instr->addr >= regions[i].offset)
 578                i++;
 579         i--;
 580
 581         /* OK, now i is pointing at the erase region in which this
 582            erase request starts. Check the start of the requested
 583            erase range is aligned with the erase size which is in
 584            effect here.
 585         */
 586
 587         if (instr->addr & (regions[i].erasesize-1))
 588                 return -EINVAL;
 589
 590         /* Remember the erase region we start on */
 591         first = i;
 592
 593         /* Next, check that the end of the requested erase is aligned
 594          * with the erase region at that address.
 595          */
 596
 597         while (i<mtd->numeraseregions && (instr->addr + instr->len) >= regions[i].offset)
 598                 i++;
 599
 600         /* As before, drop back one to point at the region in which
 601            the address actually falls
 602         */
 603         i--;
 604
 605         if ((instr->addr + instr->len) & (regions[i].erasesize-1))
 606                 return -EINVAL;
 607
 608         chipnum = instr->addr >> cfi->chipshift;
 609         adr = instr->addr - (chipnum << cfi->chipshift);
 610         len = instr->len;
 611
 612         i=first;
 613
 614         while(len) {
 615                 ret = do_erase_oneblock(map, &cfi->chips[chipnum], adr);
 616
 617                 if (ret)
 618                         return ret;
 619
 620                 adr += regions[i].erasesize;
 621                 len -= regions[i].erasesize;
 622
 623                 if (adr % (1<< cfi->chipshift) == ((regions[i].offset + (regions[i].erasesize * regions[i].numblocks)) %( 1<< cfi->chipshift)))
 624                         i++;
 625
 626                 if (adr >> cfi->chipshift) {
 627                         adr = 0;
 628                         chipnum++;
 629
 630                         if (chipnum >= cfi->numchips)
 631                         break;
 632                 }
 633         }
 634
 635         instr->state = MTD_ERASE_DONE;
 636         if (instr->callback)
 637                 instr->callback(instr);
 638
 639         return 0;
 640 }
 641
 642 static int cfi_sststd_erase_onesize(struct mtd_info *mtd, struct erase_info *instr)
 643 {
 644         struct map_info *map = mtd->priv;
 645         struct cfi_private *cfi = map->fldrv_priv;
 646         unsigned long adr, len;
 647         int chipnum, ret = 0;
 648
 649         if (instr->addr & (mtd->erasesize - 1))
 650                 return -EINVAL;
 651
 652         if (instr->len & (mtd->erasesize -1))
 653                 return -EINVAL;
 654
 655         if ((instr->len + instr->addr) > mtd->size)
 656                 return -EINVAL;
 657
 658         chipnum = instr->addr >> cfi->chipshift;
 659         adr = instr->addr - (chipnum << cfi->chipshift);
 660         len = instr->len;
 661
 662         while(len) {
 663                 ret = do_erase_oneblock(map, &cfi->chips[chipnum], adr);
 664
 665                 if (ret)
 666                         return ret;
 667
 668                 adr += mtd->erasesize;
 669                 len -= mtd->erasesize;
 670
 671                 if (adr >> cfi->chipshift) {
 672                         adr = 0;
 673                         chipnum++;
 674
 675                         if (chipnum >= cfi->numchips)
 676                         break;
 677                 }
 678         }
 679
 680         instr->state = MTD_ERASE_DONE;
 681         if (instr->callback)
 682                 instr->callback(instr);
 683
 684         return 0;
 685 }
 686
 687 static void cfi_sststd_sync (struct mtd_info *mtd)
 688 {
 689         struct map_info *map = mtd->priv;
 690         struct cfi_private *cfi = map->fldrv_priv;
 691         int i;
 692         struct flchip *chip;
 693         int ret = 0;
 694         DECLARE_WAITQUEUE(wait, current);
 695
 696         for (i=0; !ret && i<cfi->numchips; i++) {
 697                 chip = &cfi->chips[i];
 698
 699         retry:
 700                 cfi_spin_lock(chip->mutex);
 701
 702                 switch(chip->state) {
 703                 case FL_READY:
 704                 case FL_STATUS:
 705                 case FL_CFI_QUERY:
 706                 case FL_JEDEC_QUERY:
 707                         chip->oldstate = chip->state;
 708                         chip->state = FL_SYNCING;
 709                         /* No need to wake_up() on this state change -
 710                          * as the whole point is that nobody can do anything
 711                          * with the chip now anyway.
 712                          */
 713                 case FL_SYNCING:
 714                         cfi_spin_unlock(chip->mutex);
 715                         break;
 716
 717                 default:
 718                         /* Not an idle state */
 719                         add_wait_queue(&chip->wq, &wait);
 720
 721                         cfi_spin_unlock(chip->mutex);
 722
 723                         schedule();
 724
 725                         remove_wait_queue(&chip->wq, &wait);
 726
 727                         goto retry;
 728                 }
 729         }
 730
 731         /* Unlock the chips again */
 732
 733         for (i--; i >=0; i--) {
 734                 chip = &cfi->chips[i];
 735
 736                 cfi_spin_lock(chip->mutex);
 737
 738                 if (chip->state == FL_SYNCING) {
 739                         chip->state = chip->oldstate;
 740                         wake_up(&chip->wq);
 741                 }
 742                 cfi_spin_unlock(chip->mutex);
 743         }
 744 }
 745
 746
 747 static int cfi_sststd_suspend(struct mtd_info *mtd)
 748 {
 749         struct map_info *map = mtd->priv;
 750         struct cfi_private *cfi = map->fldrv_priv;
 751         int i;
 752         struct flchip *chip;
 753         int ret = 0;
 754 //printk("suspend\n");
 755
 756         for (i=0; !ret && i<cfi->numchips; i++) {
 757                 chip = &cfi->chips[i];
 758
 759                 cfi_spin_lock(chip->mutex);
 760
 761                 switch(chip->state) {
 762                 case FL_READY:
 763                 case FL_STATUS:
 764                 case FL_CFI_QUERY:
 765                 case FL_JEDEC_QUERY:
 766                         chip->oldstate = chip->state;
 767                         chip->state = FL_PM_SUSPENDED;
 768                         /* No need to wake_up() on this state change -
 769                          * as the whole point is that nobody can do anything
 770                          * with the chip now anyway.
 771                          */
 772                 case FL_PM_SUSPENDED:
 773                         break;
 774
 775                 default:
 776                         ret = -EAGAIN;
 777                         break;
 778                 }
 779                 cfi_spin_unlock(chip->mutex);
 780         }
 781
 782         /* Unlock the chips again */
 783
 784         if (ret) {
 785                 for (i--; i >=0; i--) {
 786                         chip = &cfi->chips[i];
 787
 788                         cfi_spin_lock(chip->mutex);
 789
 790                         if (chip->state == FL_PM_SUSPENDED) {
 791                                 chip->state = chip->oldstate;
 792                                 wake_up(&chip->wq);
 793                         }
 794                         cfi_spin_unlock(chip->mutex);
 795                 }
 796         }
 797
 798         return ret;
 799 }
 800
 801 static void cfi_sststd_resume(struct mtd_info *mtd)
 802 {
 803         struct map_info *map = mtd->priv;
 804         struct cfi_private *cfi = map->fldrv_priv;
 805         int i;
 806         struct flchip *chip;
 807 //printk("resume\n");
 808
 809         for (i=0; i<cfi->numchips; i++) {
 810
 811                 chip = &cfi->chips[i];
 812
 813                 cfi_spin_lock(chip->mutex);
 814
 815                 if (chip->state == FL_PM_SUSPENDED) {
 816                         chip->state = FL_READY;
 817                         cfi_write(map, CMD(0xF0), chip->start);
 818                         wake_up(&chip->wq);
 819                 }
 820                 else
 821                         printk("Argh. Chip not in PM_SUSPENDED state upon resume()\n");
 822
 823                 cfi_spin_unlock(chip->mutex);
 824         }
 825 }
 826
 827 static void cfi_sststd_destroy(struct mtd_info *mtd)
 828 {
 829         struct map_info *map = mtd->priv;
 830         struct cfi_private *cfi = map->fldrv_priv;
 831         kfree(cfi->cmdset_priv);
 832         kfree(cfi);
 833 }
 834
 835 #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
 836 #define cfi_sststd_init init_module
 837 #define cfi_sststd_exit cleanup_module
 838 #endif
 839
 840 static char im_name[]="cfi_cmdset_0701";
 841
 842 mod_init_t cfi_sststd_init(void)
 843 {
 844         inter_module_register(im_name, THIS_MODULE, &cfi_cmdset_0701);
 845         return 0;
 846 }
 847
 848 mod_exit_t cfi_sststd_exit(void)
 849 {
 850         inter_module_unregister(im_name);
 851 }
 852
 853 module_init(cfi_sststd_init);
 854 module_exit(cfi_sststd_exit);
 855