git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/chips/cfi_cmdset_0020.c

   1 /*
   2  * Common Flash Interface support:
   3  *   ST Advanced Architecture Command Set (ID 0x0020)
   4  *
   5  * (C) 2000 Red Hat. GPL'd
   6  *
   7  * $Id: cfi_cmdset_0020.c,v 1.22 2005/11/07 11:14:22 gleixner Exp $
   8  *
   9  * 10/10/2000   Nicolas Pitre <nico@cam.org>
  10  *      - completely revamped method functions so they are aware and
  11  *        independent of the flash geometry (buswidth, interleave, etc.)
  12  *      - scalability vs code size is completely set at compile-time
  13  *        (see include/linux/mtd/cfi.h for selection)
  14  *      - optimized write buffer method
  15  * 06/21/2002   Joern Engel <joern@wh.fh-wedel.de> and others
  16  *      - modified Intel Command Set 0x0001 to support ST Advanced Architecture
  17  *        (command set 0x0020)
  18  *      - added a writev function
  19  * 07/13/2005   Joern Engel <joern@wh.fh-wedel.de>
  20  *      - Plugged memory leak in cfi_staa_writev().
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/kernel.h>
  26 #include <linux/sched.h>
  27 #include <linux/init.h>
  28 #include <asm/io.h>
  29 #include <asm/byteorder.h>
  30
  31 #include <linux/errno.h>
  32 #include <linux/slab.h>
  33 #include <linux/delay.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/mtd/map.h>
  36 #include <linux/mtd/cfi.h>
  37 #include <linux/mtd/mtd.h>
  38 #include <linux/mtd/compatmac.h>
  39
  40
  41 static int cfi_staa_read(struct mtd_info *, loff_t, size_t, size_t *, u_char *);
  42 static int cfi_staa_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
  43 static int cfi_staa_writev(struct mtd_info *mtd, const struct kvec *vecs,
  44                 unsigned long count, loff_t to, size_t *retlen);
  45 static int cfi_staa_erase_varsize(struct mtd_info *, struct erase_info *);
  46 static void cfi_staa_sync (struct mtd_info *);
  47 static int cfi_staa_lock(struct mtd_info *mtd, loff_t ofs, size_t len);
  48 static int cfi_staa_unlock(struct mtd_info *mtd, loff_t ofs, size_t len);
  49 static int cfi_staa_suspend (struct mtd_info *);
  50 static void cfi_staa_resume (struct mtd_info *);
  51
  52 static void cfi_staa_destroy(struct mtd_info *);
  53
  54 struct mtd_info *cfi_cmdset_0020(struct map_info *, int);
  55
  56 static struct mtd_info *cfi_staa_setup (struct map_info *);
  57
  58 static struct mtd_chip_driver cfi_staa_chipdrv = {
  59         .probe          = NULL, /* Not usable directly */
  60         .destroy        = cfi_staa_destroy,
  61         .name           = "cfi_cmdset_0020",
  62         .module         = THIS_MODULE
  63 };
  64
  65 /* #define DEBUG_LOCK_BITS */
  66 //#define DEBUG_CFI_FEATURES
  67
  68 #ifdef DEBUG_CFI_FEATURES
  69 static void cfi_tell_features(struct cfi_pri_intelext *extp)
  70 {
  71         int i;
  72         printk("  Feature/Command Support: %4.4X\n", extp->FeatureSupport);
  73         printk("     - Chip Erase:         %s\n", extp->FeatureSupport&1?"supported":"unsupported");
  74         printk("     - Suspend Erase:      %s\n", extp->FeatureSupport&2?"supported":"unsupported");
  75         printk("     - Suspend Program:    %s\n", extp->FeatureSupport&4?"supported":"unsupported");
  76         printk("     - Legacy Lock/Unlock: %s\n", extp->FeatureSupport&8?"supported":"unsupported");
  77         printk("     - Queued Erase:       %s\n", extp->FeatureSupport&16?"supported":"unsupported");
  78         printk("     - Instant block lock: %s\n", extp->FeatureSupport&32?"supported":"unsupported");
  79         printk("     - Protection Bits:    %s\n", extp->FeatureSupport&64?"supported":"unsupported");
  80         printk("     - Page-mode read:     %s\n", extp->FeatureSupport&128?"supported":"unsupported");
  81         printk("     - Synchronous read:   %s\n", extp->FeatureSupport&256?"supported":"unsupported");
  82         for (i=9; i<32; i++) {
  83                 if (extp->FeatureSupport & (1<<i))
  84                         printk("     - Unknown Bit %X:      supported\n", i);
  85         }
  86
  87         printk("  Supported functions after Suspend: %2.2X\n", extp->SuspendCmdSupport);
  88         printk("     - Program after Erase Suspend: %s\n", extp->SuspendCmdSupport&1?"supported":"unsupported");
  89         for (i=1; i<8; i++) {
  90                 if (extp->SuspendCmdSupport & (1<<i))
  91                         printk("     - Unknown Bit %X:               supported\n", i);
  92         }
  93
  94         printk("  Block Status Register Mask: %4.4X\n", extp->BlkStatusRegMask);
  95         printk("     - Lock Bit Active:      %s\n", extp->BlkStatusRegMask&1?"yes":"no");
  96         printk("     - Valid Bit Active:     %s\n", extp->BlkStatusRegMask&2?"yes":"no");
  97         for (i=2; i<16; i++) {
  98                 if (extp->BlkStatusRegMask & (1<<i))
  99                         printk("     - Unknown Bit %X Active: yes\n",i);
 100         }
 101
 102         printk("  Vcc Logic Supply Optimum Program/Erase Voltage: %d.%d V\n",
 103                extp->VccOptimal >> 8, extp->VccOptimal & 0xf);
 104         if (extp->VppOptimal)
 105                 printk("  Vpp Programming Supply Optimum Program/Erase Voltage: %d.%d V\n",
 106                        extp->VppOptimal >> 8, extp->VppOptimal & 0xf);
 107 }
 108 #endif
 109
 110 /* This routine is made available to other mtd code via
 111  * inter_module_register.  It must only be accessed through
 112  * inter_module_get which will bump the use count of this module.  The
 113  * addresses passed back in cfi are valid as long as the use count of
 114  * this module is non-zero, i.e. between inter_module_get and
 115  * inter_module_put.  Keith Owens <kaos@ocs.com.au> 29 Oct 2000.
 116  */
 117 struct mtd_info *cfi_cmdset_0020(struct map_info *map, int primary)
 118 {
 119         struct cfi_private *cfi = map->fldrv_priv;
 120         int i;
 121
 122         if (cfi->cfi_mode) {
 123                 /*
 124                  * It's a real CFI chip, not one for which the probe
 125                  * routine faked a CFI structure. So we read the feature
 126                  * table from it.
 127                  */
 128                 __u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
 129                 struct cfi_pri_intelext *extp;
 130
 131                 extp = (struct cfi_pri_intelext*)cfi_read_pri(map, adr, sizeof(*extp), "ST Microelectronics");
 132                 if (!extp)
 133                         return NULL;
 134
 135                 if (extp->MajorVersion != '1' ||
 136                     (extp->MinorVersion < '0' || extp->MinorVersion > '3')) {
 137                         printk(KERN_ERR "  Unknown ST Microelectronics"
 138                                " Extended Query version %c.%c.\n",
 139                                extp->MajorVersion, extp->MinorVersion);
 140                         kfree(extp);
 141                         return NULL;
 142                 }
 143
 144                 /* Do some byteswapping if necessary */
 145                 extp->FeatureSupport = cfi32_to_cpu(extp->FeatureSupport);
 146                 extp->BlkStatusRegMask = cfi32_to_cpu(extp->BlkStatusRegMask);
 147
 148 #ifdef DEBUG_CFI_FEATURES
 149                 /* Tell the user about it in lots of lovely detail */
 150                 cfi_tell_features(extp);
 151 #endif
 152
 153                 /* Install our own private info structure */
 154                 cfi->cmdset_priv = extp;
 155         }
 156
 157         for (i=0; i< cfi->numchips; i++) {
 158                 cfi->chips[i].word_write_time = 128;
 159                 cfi->chips[i].buffer_write_time = 128;
 160                 cfi->chips[i].erase_time = 1024;
 161                 cfi->chips[i].ref_point_counter = 0;
 162                 init_waitqueue_head(&(cfi->chips[i].wq));
 163         }
 164
 165         return cfi_staa_setup(map);
 166 }
 167 EXPORT_SYMBOL_GPL(cfi_cmdset_0020);
 168
 169 static struct mtd_info *cfi_staa_setup(struct map_info *map)
 170 {
 171         struct cfi_private *cfi = map->fldrv_priv;
 172         struct mtd_info *mtd;
 173         unsigned long offset = 0;
 174         int i,j;
 175         unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;
 176
 177         mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
 178         //printk(KERN_DEBUG "number of CFI chips: %d\n", cfi->numchips);
 179
 180         if (!mtd) {
 181                 printk(KERN_ERR "Failed to allocate memory for MTD device\n");
 182                 kfree(cfi->cmdset_priv);
 183                 return NULL;
 184         }
 185
 186         mtd->priv = map;
 187         mtd->type = MTD_NORFLASH;
 188         mtd->size = devsize * cfi->numchips;
 189
 190         mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
 191         mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info)
 192                         * mtd->numeraseregions, GFP_KERNEL);
 193         if (!mtd->eraseregions) {
 194                 printk(KERN_ERR "Failed to allocate memory for MTD erase region info\n");
 195                 kfree(cfi->cmdset_priv);
 196                 kfree(mtd);
 197                 return NULL;
 198         }
 199
 200         for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
 201                 unsigned long ernum, ersize;
 202                 ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave;
 203                 ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1;
 204
 205                 if (mtd->erasesize < ersize) {
 206                         mtd->erasesize = ersize;
 207                 }
 208                 for (j=0; j<cfi->numchips; j++) {
 209                         mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset;
 210                         mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
 211                         mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
 212                 }
 213                 offset += (ersize * ernum);
 214                 }
 215
 216                 if (offset != devsize) {
 217                         /* Argh */
 218                         printk(KERN_WARNING "Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize);
 219                         kfree(mtd->eraseregions);
 220                         kfree(cfi->cmdset_priv);
 221                         kfree(mtd);
 222                         return NULL;
 223                 }
 224
 225                 for (i=0; i<mtd->numeraseregions;i++){
 226                         printk(KERN_DEBUG "%d: offset=0x%x,size=0x%x,blocks=%d\n",
 227                                i,mtd->eraseregions[i].offset,
 228                                mtd->eraseregions[i].erasesize,
 229                                mtd->eraseregions[i].numblocks);
 230                 }
 231
 232         /* Also select the correct geometry setup too */
 233         mtd->erase = cfi_staa_erase_varsize;
 234         mtd->read = cfi_staa_read;
 235         mtd->write = cfi_staa_write_buffers;
 236         mtd->writev = cfi_staa_writev;
 237         mtd->sync = cfi_staa_sync;
 238         mtd->lock = cfi_staa_lock;
 239         mtd->unlock = cfi_staa_unlock;
 240         mtd->suspend = cfi_staa_suspend;
 241         mtd->resume = cfi_staa_resume;
 242         mtd->flags = MTD_CAP_NORFLASH & ~MTD_BIT_WRITEABLE;
 243         mtd->writesize = 8; /* FIXME: Should be 0 for STMicro flashes w/out ECC */
 244         map->fldrv = &cfi_staa_chipdrv;
 245         __module_get(THIS_MODULE);
 246         mtd->name = map->name;
 247         return mtd;
 248 }
 249
 250
 251 static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
 252 {
 253         map_word status, status_OK;
 254         unsigned long timeo;
 255         DECLARE_WAITQUEUE(wait, current);
 256         int suspended = 0;
 257         unsigned long cmd_addr;
 258         struct cfi_private *cfi = map->fldrv_priv;
 259
 260         adr += chip->start;
 261
 262         /* Ensure cmd read/writes are aligned. */
 263         cmd_addr = adr & ~(map_bankwidth(map)-1);
 264
 265         /* Let's determine this according to the interleave only once */
 266         status_OK = CMD(0x80);
 267
 268         timeo = jiffies + HZ;
 269  retry:
 270         spin_lock_bh(chip->mutex);
 271
 272         /* Check that the chip's ready to talk to us.
 273          * If it's in FL_ERASING state, suspend it and make it talk now.
 274          */
 275         switch (chip->state) {
 276         case FL_ERASING:
 277                 if (!(((struct cfi_pri_intelext *)cfi->cmdset_priv)->FeatureSupport & 2))
 278                         goto sleep; /* We don't support erase suspend */
 279
 280                 map_write (map, CMD(0xb0), cmd_addr);
 281                 /* If the flash has finished erasing, then 'erase suspend'
 282                  * appears to make some (28F320) flash devices switch to
 283                  * 'read' mode.  Make sure that we switch to 'read status'
 284                  * mode so we get the right data. --rmk
 285                  */
 286                 map_write(map, CMD(0x70), cmd_addr);
 287                 chip->oldstate = FL_ERASING;
 288                 chip->state = FL_ERASE_SUSPENDING;
 289                 //              printk("Erase suspending at 0x%lx\n", cmd_addr);
 290                 for (;;) {
 291                         status = map_read(map, cmd_addr);
 292                         if (map_word_andequal(map, status, status_OK, status_OK))
 293                                 break;
 294
 295                         if (time_after(jiffies, timeo)) {
 296                                 /* Urgh */
 297                                 map_write(map, CMD(0xd0), cmd_addr);
 298                                 /* make sure we're in 'read status' mode */
 299                                 map_write(map, CMD(0x70), cmd_addr);
 300                                 chip->state = FL_ERASING;
 301                                 spin_unlock_bh(chip->mutex);
 302                                 printk(KERN_ERR "Chip not ready after erase "
 303                                        "suspended: status = 0x%lx\n", status.x[0]);
 304                                 return -EIO;
 305                         }
 306
 307                         spin_unlock_bh(chip->mutex);
 308                         cfi_udelay(1);
 309                         spin_lock_bh(chip->mutex);
 310                 }
 311
 312                 suspended = 1;
 313                 map_write(map, CMD(0xff), cmd_addr);
 314                 chip->state = FL_READY;
 315                 break;
 316
 317 #if 0
 318         case FL_WRITING:
 319                 /* Not quite yet */
 320 #endif
 321
 322         case FL_READY:
 323                 break;
 324
 325         case FL_CFI_QUERY:
 326         case FL_JEDEC_QUERY:
 327                 map_write(map, CMD(0x70), cmd_addr);
 328                 chip->state = FL_STATUS;
 329
 330         case FL_STATUS:
 331                 status = map_read(map, cmd_addr);
 332                 if (map_word_andequal(map, status, status_OK, status_OK)) {
 333                         map_write(map, CMD(0xff), cmd_addr);
 334                         chip->state = FL_READY;
 335                         break;
 336                 }
 337
 338                 /* Urgh. Chip not yet ready to talk to us. */
 339                 if (time_after(jiffies, timeo)) {
 340                         spin_unlock_bh(chip->mutex);
 341                         printk(KERN_ERR "waiting for chip to be ready timed out in read. WSM status = %lx\n", status.x[0]);
 342                         return -EIO;
 343                 }
 344
 345                 /* Latency issues. Drop the lock, wait a while and retry */
 346                 spin_unlock_bh(chip->mutex);
 347                 cfi_udelay(1);
 348                 goto retry;
 349
 350         default:
 351         sleep:
 352                 /* Stick ourselves on a wait queue to be woken when
 353                    someone changes the status */
 354                 set_current_state(TASK_UNINTERRUPTIBLE);
 355                 add_wait_queue(&chip->wq, &wait);
 356                 spin_unlock_bh(chip->mutex);
 357                 schedule();
 358                 remove_wait_queue(&chip->wq, &wait);
 359                 timeo = jiffies + HZ;
 360                 goto retry;
 361         }
 362
 363         map_copy_from(map, buf, adr, len);
 364
 365         if (suspended) {
 366                 chip->state = chip->oldstate;
 367                 /* What if one interleaved chip has finished and the
 368                    other hasn't? The old code would leave the finished
 369                    one in READY mode. That's bad, and caused -EROFS
 370                    errors to be returned from do_erase_oneblock because
 371                    that's the only bit it checked for at the time.
 372                    As the state machine appears to explicitly allow
 373                    sending the 0x70 (Read Status) command to an erasing
 374                    chip and expecting it to be ignored, that's what we
 375                    do. */
 376                 map_write(map, CMD(0xd0), cmd_addr);
 377                 map_write(map, CMD(0x70), cmd_addr);
 378         }
 379
 380         wake_up(&chip->wq);
 381         spin_unlock_bh(chip->mutex);
 382         return 0;
 383 }
 384
 385 static int cfi_staa_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
 386 {
 387         struct map_info *map = mtd->priv;
 388         struct cfi_private *cfi = map->fldrv_priv;
 389         unsigned long ofs;
 390         int chipnum;
 391         int ret = 0;
 392
 393         /* ofs: offset within the first chip that the first read should start */
 394         chipnum = (from >> cfi->chipshift);
 395         ofs = from - (chipnum <<  cfi->chipshift);
 396
 397         *retlen = 0;
 398
 399         while (len) {
 400                 unsigned long thislen;
 401
 402                 if (chipnum >= cfi->numchips)
 403                         break;
 404
 405                 if ((len + ofs -1) >> cfi->chipshift)
 406                         thislen = (1<<cfi->chipshift) - ofs;
 407                 else
 408                         thislen = len;
 409
 410                 ret = do_read_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf);
 411                 if (ret)
 412                         break;
 413
 414                 *retlen += thislen;
 415                 len -= thislen;
 416                 buf += thislen;
 417
 418                 ofs = 0;
 419                 chipnum++;
 420         }
 421         return ret;
 422 }
 423
 424 static inline int do_write_buffer(struct map_info *map, struct flchip *chip,
 425                                   unsigned long adr, const u_char *buf, int len)
 426 {
 427         struct cfi_private *cfi = map->fldrv_priv;
 428         map_word status, status_OK;
 429         unsigned long cmd_adr, timeo;
 430         DECLARE_WAITQUEUE(wait, current);
 431         int wbufsize, z;
 432
 433         /* M58LW064A requires bus alignment for buffer wriets -- saw */
 434         if (adr & (map_bankwidth(map)-1))
 435             return -EINVAL;
 436
 437         wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
 438         adr += chip->start;
 439         cmd_adr = adr & ~(wbufsize-1);
 440
 441         /* Let's determine this according to the interleave only once */
 442         status_OK = CMD(0x80);
 443
 444         timeo = jiffies + HZ;
 445  retry:
 446
 447 #ifdef DEBUG_CFI_FEATURES
 448        printk("%s: chip->state[%d]\n", __FUNCTION__, chip->state);
 449 #endif
 450         spin_lock_bh(chip->mutex);
 451
 452         /* Check that the chip's ready to talk to us.
 453          * Later, we can actually think about interrupting it
 454          * if it's in FL_ERASING state.
 455          * Not just yet, though.
 456          */
 457         switch (chip->state) {
 458         case FL_READY:
 459                 break;
 460
 461         case FL_CFI_QUERY:
 462         case FL_JEDEC_QUERY:
 463                 map_write(map, CMD(0x70), cmd_adr);
 464                 chip->state = FL_STATUS;
 465 #ifdef DEBUG_CFI_FEATURES
 466         printk("%s: 1 status[%x]\n", __FUNCTION__, map_read(map, cmd_adr));
 467 #endif
 468
 469         case FL_STATUS:
 470                 status = map_read(map, cmd_adr);
 471                 if (map_word_andequal(map, status, status_OK, status_OK))
 472                         break;
 473                 /* Urgh. Chip not yet ready to talk to us. */
 474                 if (time_after(jiffies, timeo)) {
 475                         spin_unlock_bh(chip->mutex);
 476                         printk(KERN_ERR "waiting for chip to be ready timed out in buffer write Xstatus = %lx, status = %lx\n",
 477                                status.x[0], map_read(map, cmd_adr).x[0]);
 478                         return -EIO;
 479                 }
 480
 481                 /* Latency issues. Drop the lock, wait a while and retry */
 482                 spin_unlock_bh(chip->mutex);
 483                 cfi_udelay(1);
 484                 goto retry;
 485
 486         default:
 487                 /* Stick ourselves on a wait queue to be woken when
 488                    someone changes the status */
 489                 set_current_state(TASK_UNINTERRUPTIBLE);
 490                 add_wait_queue(&chip->wq, &wait);
 491                 spin_unlock_bh(chip->mutex);
 492                 schedule();
 493                 remove_wait_queue(&chip->wq, &wait);
 494                 timeo = jiffies + HZ;
 495                 goto retry;
 496         }
 497
 498         ENABLE_VPP(map);
 499         map_write(map, CMD(0xe8), cmd_adr);
 500         chip->state = FL_WRITING_TO_BUFFER;
 501
 502         z = 0;
 503         for (;;) {
 504                 status = map_read(map, cmd_adr);
 505                 if (map_word_andequal(map, status, status_OK, status_OK))
 506                         break;
 507
 508                 spin_unlock_bh(chip->mutex);
 509                 cfi_udelay(1);
 510                 spin_lock_bh(chip->mutex);
 511
 512                 if (++z > 100) {
 513                         /* Argh. Not ready for write to buffer */
 514                         DISABLE_VPP(map);
 515                         map_write(map, CMD(0x70), cmd_adr);
 516                         chip->state = FL_STATUS;
 517                         spin_unlock_bh(chip->mutex);
 518                         printk(KERN_ERR "Chip not ready for buffer write. Xstatus = %lx\n", status.x[0]);
 519                         return -EIO;
 520                 }
 521         }
 522
 523         /* Write length of data to come */
 524         map_write(map, CMD(len/map_bankwidth(map)-1), cmd_adr );
 525
 526         /* Write data */
 527         for (z = 0; z < len;
 528              z += map_bankwidth(map), buf += map_bankwidth(map)) {
 529                 map_word d;
 530                 d = map_word_load(map, buf);
 531                 map_write(map, d, adr+z);
 532         }
 533         /* GO GO GO */
 534         map_write(map, CMD(0xd0), cmd_adr);
 535         chip->state = FL_WRITING;
 536
 537         spin_unlock_bh(chip->mutex);
 538         cfi_udelay(chip->buffer_write_time);
 539         spin_lock_bh(chip->mutex);
 540
 541         timeo = jiffies + (HZ/2);
 542         z = 0;
 543         for (;;) {
 544                 if (chip->state != FL_WRITING) {
 545                         /* Someone's suspended the write. Sleep */
 546                         set_current_state(TASK_UNINTERRUPTIBLE);
 547                         add_wait_queue(&chip->wq, &wait);
 548                         spin_unlock_bh(chip->mutex);
 549                         schedule();
 550                         remove_wait_queue(&chip->wq, &wait);
 551                         timeo = jiffies + (HZ / 2); /* FIXME */
 552                         spin_lock_bh(chip->mutex);
 553                         continue;
 554                 }
 555
 556                 status = map_read(map, cmd_adr);
 557                 if (map_word_andequal(map, status, status_OK, status_OK))
 558                         break;
 559
 560                 /* OK Still waiting */
 561                 if (time_after(jiffies, timeo)) {
 562                         /* clear status */
 563                         map_write(map, CMD(0x50), cmd_adr);
 564                         /* put back into read status register mode */
 565                         map_write(map, CMD(0x70), adr);
 566                         chip->state = FL_STATUS;
 567                         DISABLE_VPP(map);
 568                         spin_unlock_bh(chip->mutex);
 569                         printk(KERN_ERR "waiting for chip to be ready timed out in bufwrite\n");
 570                         return -EIO;
 571                 }
 572
 573                 /* Latency issues. Drop the lock, wait a while and retry */
 574                 spin_unlock_bh(chip->mutex);
 575                 cfi_udelay(1);
 576                 z++;
 577                 spin_lock_bh(chip->mutex);
 578         }
 579         if (!z) {
 580                 chip->buffer_write_time--;
 581                 if (!chip->buffer_write_time)
 582                         chip->buffer_write_time++;
 583         }
 584         if (z > 1)
 585                 chip->buffer_write_time++;
 586
 587         /* Done and happy. */
 588         DISABLE_VPP(map);
 589         chip->state = FL_STATUS;
 590
 591         /* check for errors: 'lock bit', 'VPP', 'dead cell'/'unerased cell' or 'incorrect cmd' -- saw */
 592         if (map_word_bitsset(map, status, CMD(0x3a))) {
 593 #ifdef DEBUG_CFI_FEATURES
 594                 printk("%s: 2 status[%lx]\n", __FUNCTION__, status.x[0]);
 595 #endif
 596                 /* clear status */
 597                 map_write(map, CMD(0x50), cmd_adr);
 598                 /* put back into read status register mode */
 599                 map_write(map, CMD(0x70), adr);
 600                 wake_up(&chip->wq);
 601                 spin_unlock_bh(chip->mutex);
 602                 return map_word_bitsset(map, status, CMD(0x02)) ? -EROFS : -EIO;
 603         }
 604         wake_up(&chip->wq);
 605         spin_unlock_bh(chip->mutex);
 606
 607         return 0;
 608 }
 609
 610 static int cfi_staa_write_buffers (struct mtd_info *mtd, loff_t to,
 611                                        size_t len, size_t *retlen, const u_char *buf)
 612 {
 613         struct map_info *map = mtd->priv;
 614         struct cfi_private *cfi = map->fldrv_priv;
 615         int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
 616         int ret = 0;
 617         int chipnum;
 618         unsigned long ofs;
 619
 620         *retlen = 0;
 621         if (!len)
 622                 return 0;
 623
 624         chipnum = to >> cfi->chipshift;
 625         ofs = to  - (chipnum << cfi->chipshift);
 626
 627 #ifdef DEBUG_CFI_FEATURES
 628         printk("%s: map_bankwidth(map)[%x]\n", __FUNCTION__, map_bankwidth(map));
 629         printk("%s: chipnum[%x] wbufsize[%x]\n", __FUNCTION__, chipnum, wbufsize);
 630         printk("%s: ofs[%x] len[%x]\n", __FUNCTION__, ofs, len);
 631 #endif
 632
 633         /* Write buffer is worth it only if more than one word to write... */
 634         while (len > 0) {
 635                 /* We must not cross write block boundaries */
 636                 int size = wbufsize - (ofs & (wbufsize-1));
 637
 638                 if (size > len)
 639                     size = len;
 640
 641                 ret = do_write_buffer(map, &cfi->chips[chipnum],
 642                                       ofs, buf, size);
 643                 if (ret)
 644                         return ret;
 645
 646                 ofs += size;
 647                 buf += size;
 648                 (*retlen) += size;
 649                 len -= size;
 650
 651                 if (ofs >> cfi->chipshift) {
 652                         chipnum ++;
 653                         ofs = 0;
 654                         if (chipnum == cfi->numchips)
 655                                 return 0;
 656                 }
 657         }
 658
 659         return 0;
 660 }
 661
 662 /*
 663  * Writev for ECC-Flashes is a little more complicated. We need to maintain
 664  * a small buffer for this.
 665  * XXX: If the buffer size is not a multiple of 2, this will break
 666  */
 667 #define ECCBUF_SIZE (mtd->writesize)
 668 #define ECCBUF_DIV(x) ((x) & ~(ECCBUF_SIZE - 1))
 669 #define ECCBUF_MOD(x) ((x) &  (ECCBUF_SIZE - 1))
 670 static int
 671 cfi_staa_writev(struct mtd_info *mtd, const struct kvec *vecs,
 672                 unsigned long count, loff_t to, size_t *retlen)
 673 {
 674         unsigned long i;
 675         size_t   totlen = 0, thislen;
 676         int      ret = 0;
 677         size_t   buflen = 0;
 678         static char *buffer;
 679
 680         if (!ECCBUF_SIZE) {
 681                 /* We should fall back to a general writev implementation.
 682                  * Until that is written, just break.
 683                  */
 684                 return -EIO;
 685         }
 686         buffer = kmalloc(ECCBUF_SIZE, GFP_KERNEL);
 687         if (!buffer)
 688                 return -ENOMEM;
 689
 690         for (i=0; i<count; i++) {
 691                 size_t elem_len = vecs[i].iov_len;
 692                 void *elem_base = vecs[i].iov_base;
 693                 if (!elem_len) /* FIXME: Might be unnecessary. Check that */
 694                         continue;
 695                 if (buflen) { /* cut off head */
 696                         if (buflen + elem_len < ECCBUF_SIZE) { /* just accumulate */
 697                                 memcpy(buffer+buflen, elem_base, elem_len);
 698                                 buflen += elem_len;
 699                                 continue;
 700                         }
 701                         memcpy(buffer+buflen, elem_base, ECCBUF_SIZE-buflen);
 702                         ret = mtd->write(mtd, to, ECCBUF_SIZE, &thislen, buffer);
 703                         totlen += thislen;
 704                         if (ret || thislen != ECCBUF_SIZE)
 705                                 goto write_error;
 706                         elem_len -= thislen-buflen;
 707                         elem_base += thislen-buflen;
 708                         to += ECCBUF_SIZE;
 709                 }
 710                 if (ECCBUF_DIV(elem_len)) { /* write clean aligned data */
 711                         ret = mtd->write(mtd, to, ECCBUF_DIV(elem_len), &thislen, elem_base);
 712                         totlen += thislen;
 713                         if (ret || thislen != ECCBUF_DIV(elem_len))
 714                                 goto write_error;
 715                         to += thislen;
 716                 }
 717                 buflen = ECCBUF_MOD(elem_len); /* cut off tail */
 718                 if (buflen) {
 719                         memset(buffer, 0xff, ECCBUF_SIZE);
 720                         memcpy(buffer, elem_base + thislen, buflen);
 721                 }
 722         }
 723         if (buflen) { /* flush last page, even if not full */
 724                 /* This is sometimes intended behaviour, really */
 725                 ret = mtd->write(mtd, to, buflen, &thislen, buffer);
 726                 totlen += thislen;
 727                 if (ret || thislen != ECCBUF_SIZE)
 728                         goto write_error;
 729         }
 730 write_error:
 731         if (retlen)
 732                 *retlen = totlen;
 733         kfree(buffer);
 734         return ret;
 735 }
 736
 737
 738 static inline int do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
 739 {
 740         struct cfi_private *cfi = map->fldrv_priv;
 741         map_word status, status_OK;
 742         unsigned long timeo;
 743         int retries = 3;
 744         DECLARE_WAITQUEUE(wait, current);
 745         int ret = 0;
 746
 747         adr += chip->start;
 748
 749         /* Let's determine this according to the interleave only once */
 750         status_OK = CMD(0x80);
 751
 752         timeo = jiffies + HZ;
 753 retry:
 754         spin_lock_bh(chip->mutex);
 755
 756         /* Check that the chip's ready to talk to us. */
 757         switch (chip->state) {
 758         case FL_CFI_QUERY:
 759         case FL_JEDEC_QUERY:
 760         case FL_READY:
 761                 map_write(map, CMD(0x70), adr);
 762                 chip->state = FL_STATUS;
 763
 764         case FL_STATUS:
 765                 status = map_read(map, adr);
 766                 if (map_word_andequal(map, status, status_OK, status_OK))
 767                         break;
 768
 769                 /* Urgh. Chip not yet ready to talk to us. */
 770                 if (time_after(jiffies, timeo)) {
 771                         spin_unlock_bh(chip->mutex);
 772                         printk(KERN_ERR "waiting for chip to be ready timed out in erase\n");
 773                         return -EIO;
 774                 }
 775
 776                 /* Latency issues. Drop the lock, wait a while and retry */
 777                 spin_unlock_bh(chip->mutex);
 778                 cfi_udelay(1);
 779                 goto retry;
 780
 781         default:
 782                 /* Stick ourselves on a wait queue to be woken when
 783                    someone changes the status */
 784                 set_current_state(TASK_UNINTERRUPTIBLE);
 785                 add_wait_queue(&chip->wq, &wait);
 786                 spin_unlock_bh(chip->mutex);
 787                 schedule();
 788                 remove_wait_queue(&chip->wq, &wait);
 789                 timeo = jiffies + HZ;
 790                 goto retry;
 791         }
 792
 793         ENABLE_VPP(map);
 794         /* Clear the status register first */
 795         map_write(map, CMD(0x50), adr);
 796
 797         /* Now erase */
 798         map_write(map, CMD(0x20), adr);
 799         map_write(map, CMD(0xD0), adr);
 800         chip->state = FL_ERASING;
 801
 802         spin_unlock_bh(chip->mutex);
 803         msleep(1000);
 804         spin_lock_bh(chip->mutex);
 805
 806         /* FIXME. Use a timer to check this, and return immediately. */
 807         /* Once the state machine's known to be working I'll do that */
 808
 809         timeo = jiffies + (HZ*20);
 810         for (;;) {
 811                 if (chip->state != FL_ERASING) {
 812                         /* Someone's suspended the erase. Sleep */
 813                         set_current_state(TASK_UNINTERRUPTIBLE);
 814                         add_wait_queue(&chip->wq, &wait);
 815                         spin_unlock_bh(chip->mutex);
 816                         schedule();
 817                         remove_wait_queue(&chip->wq, &wait);
 818                         timeo = jiffies + (HZ*20); /* FIXME */
 819                         spin_lock_bh(chip->mutex);
 820                         continue;
 821                 }
 822
 823                 status = map_read(map, adr);
 824                 if (map_word_andequal(map, status, status_OK, status_OK))
 825                         break;
 826
 827                 /* OK Still waiting */
 828                 if (time_after(jiffies, timeo)) {
 829                         map_write(map, CMD(0x70), adr);
 830                         chip->state = FL_STATUS;
 831                         printk(KERN_ERR "waiting for erase to complete timed out. Xstatus = %lx, status = %lx.\n", status.x[0], map_read(map, adr).x[0]);
 832                         DISABLE_VPP(map);
 833                         spin_unlock_bh(chip->mutex);
 834                         return -EIO;
 835                 }
 836
 837                 /* Latency issues. Drop the lock, wait a while and retry */
 838                 spin_unlock_bh(chip->mutex);
 839                 cfi_udelay(1);
 840                 spin_lock_bh(chip->mutex);
 841         }
 842
 843         DISABLE_VPP(map);
 844         ret = 0;
 845
 846         /* We've broken this before. It doesn't hurt to be safe */
 847         map_write(map, CMD(0x70), adr);
 848         chip->state = FL_STATUS;
 849         status = map_read(map, adr);
 850
 851         /* check for lock bit */
 852         if (map_word_bitsset(map, status, CMD(0x3a))) {
 853                 unsigned char chipstatus = status.x[0];
 854                 if (!map_word_equal(map, status, CMD(chipstatus))) {
 855                         int i, w;
 856                         for (w=0; w<map_words(map); w++) {
 857                                 for (i = 0; i<cfi_interleave(cfi); i++) {
 858                                         chipstatus |= status.x[w] >> (cfi->device_type * 8);
 859                                 }
 860                         }
 861                         printk(KERN_WARNING "Status is not identical for all chips: 0x%lx. Merging to give 0x%02x\n",
 862                                status.x[0], chipstatus);
 863                 }
 864                 /* Reset the error bits */
 865                 map_write(map, CMD(0x50), adr);
 866                 map_write(map, CMD(0x70), adr);
 867
 868                 if ((chipstatus & 0x30) == 0x30) {
 869                         printk(KERN_NOTICE "Chip reports improper command sequence: status 0x%x\n", chipstatus);
 870                         ret = -EIO;
 871                 } else if (chipstatus & 0x02) {
 872                         /* Protection bit set */
 873                         ret = -EROFS;
 874                 } else if (chipstatus & 0x8) {
 875                         /* Voltage */
 876                         printk(KERN_WARNING "Chip reports voltage low on erase: status 0x%x\n", chipstatus);
 877                         ret = -EIO;
 878                 } else if (chipstatus & 0x20) {
 879                         if (retries--) {
 880                                 printk(KERN_DEBUG "Chip erase failed at 0x%08lx: status 0x%x. Retrying...\n", adr, chipstatus);
 881                                 timeo = jiffies + HZ;
 882                                 chip->state = FL_STATUS;
 883                                 spin_unlock_bh(chip->mutex);
 884                                 goto retry;
 885                         }
 886                         printk(KERN_DEBUG "Chip erase failed at 0x%08lx: status 0x%x\n", adr, chipstatus);
 887                         ret = -EIO;
 888                 }
 889         }
 890
 891         wake_up(&chip->wq);
 892         spin_unlock_bh(chip->mutex);
 893         return ret;
 894 }
 895
 896 int cfi_staa_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
 897 {       struct map_info *map = mtd->priv;
 898         struct cfi_private *cfi = map->fldrv_priv;
 899         unsigned long adr, len;
 900         int chipnum, ret = 0;
 901         int i, first;
 902         struct mtd_erase_region_info *regions = mtd->eraseregions;
 903
 904         if (instr->addr > mtd->size)
 905                 return -EINVAL;
 906
 907         if ((instr->len + instr->addr) > mtd->size)
 908                 return -EINVAL;
 909
 910         /* Check that both start and end of the requested erase are
 911          * aligned with the erasesize at the appropriate addresses.
 912          */
 913
 914         i = 0;
 915
 916         /* Skip all erase regions which are ended before the start of
 917            the requested erase. Actually, to save on the calculations,
 918            we skip to the first erase region which starts after the
 919            start of the requested erase, and then go back one.
 920         */
 921
 922         while (i < mtd->numeraseregions && instr->addr >= regions[i].offset)
 923                i++;
 924         i--;
 925
 926         /* OK, now i is pointing at the erase region in which this
 927            erase request starts. Check the start of the requested
 928            erase range is aligned with the erase size which is in
 929            effect here.
 930         */
 931
 932         if (instr->addr & (regions[i].erasesize-1))
 933                 return -EINVAL;
 934
 935         /* Remember the erase region we start on */
 936         first = i;
 937
 938         /* Next, check that the end of the requested erase is aligned
 939          * with the erase region at that address.
 940          */
 941
 942         while (i<mtd->numeraseregions && (instr->addr + instr->len) >= regions[i].offset)
 943                 i++;
 944
 945         /* As before, drop back one to point at the region in which
 946            the address actually falls
 947         */
 948         i--;
 949
 950         if ((instr->addr + instr->len) & (regions[i].erasesize-1))
 951                 return -EINVAL;
 952
 953         chipnum = instr->addr >> cfi->chipshift;
 954         adr = instr->addr - (chipnum << cfi->chipshift);
 955         len = instr->len;
 956
 957         i=first;
 958
 959         while(len) {
 960                 ret = do_erase_oneblock(map, &cfi->chips[chipnum], adr);
 961
 962                 if (ret)
 963                         return ret;
 964
 965                 adr += regions[i].erasesize;
 966                 len -= regions[i].erasesize;
 967
 968                 if (adr % (1<< cfi->chipshift) == ((regions[i].offset + (regions[i].erasesize * regions[i].numblocks)) %( 1<< cfi->chipshift)))
 969                         i++;
 970
 971                 if (adr >> cfi->chipshift) {
 972                         adr = 0;
 973                         chipnum++;
 974
 975                         if (chipnum >= cfi->numchips)
 976                         break;
 977                 }
 978         }
 979
 980         instr->state = MTD_ERASE_DONE;
 981         mtd_erase_callback(instr);
 982
 983         return 0;
 984 }
 985
 986 static void cfi_staa_sync (struct mtd_info *mtd)
 987 {
 988         struct map_info *map = mtd->priv;
 989         struct cfi_private *cfi = map->fldrv_priv;
 990         int i;
 991         struct flchip *chip;
 992         int ret = 0;
 993         DECLARE_WAITQUEUE(wait, current);
 994
 995         for (i=0; !ret && i<cfi->numchips; i++) {
 996                 chip = &cfi->chips[i];
 997
 998         retry:
 999                 spin_lock_bh(chip->mutex);
1000
1001                 switch(chip->state) {
1002                 case FL_READY:
1003                 case FL_STATUS:
1004                 case FL_CFI_QUERY:
1005                 case FL_JEDEC_QUERY:
1006                         chip->oldstate = chip->state;
1007                         chip->state = FL_SYNCING;
1008                         /* No need to wake_up() on this state change -
1009                          * as the whole point is that nobody can do anything
1010                          * with the chip now anyway.
1011                          */
1012                 case FL_SYNCING:
1013                         spin_unlock_bh(chip->mutex);
1014                         break;
1015
1016                 default:
1017                         /* Not an idle state */
1018                         add_wait_queue(&chip->wq, &wait);
1019
1020                         spin_unlock_bh(chip->mutex);
1021                         schedule();
1022                         remove_wait_queue(&chip->wq, &wait);
1023
1024                         goto retry;
1025                 }
1026         }
1027
1028         /* Unlock the chips again */
1029
1030         for (i--; i >=0; i--) {
1031                 chip = &cfi->chips[i];
1032
1033                 spin_lock_bh(chip->mutex);
1034
1035                 if (chip->state == FL_SYNCING) {
1036                         chip->state = chip->oldstate;
1037                         wake_up(&chip->wq);
1038                 }
1039                 spin_unlock_bh(chip->mutex);
1040         }
1041 }
1042
1043 static inline int do_lock_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
1044 {
1045         struct cfi_private *cfi = map->fldrv_priv;
1046         map_word status, status_OK;
1047         unsigned long timeo = jiffies + HZ;
1048         DECLARE_WAITQUEUE(wait, current);
1049
1050         adr += chip->start;
1051
1052         /* Let's determine this according to the interleave only once */
1053         status_OK = CMD(0x80);
1054
1055         timeo = jiffies + HZ;
1056 retry:
1057         spin_lock_bh(chip->mutex);
1058
1059         /* Check that the chip's ready to talk to us. */
1060         switch (chip->state) {
1061         case FL_CFI_QUERY:
1062         case FL_JEDEC_QUERY:
1063         case FL_READY:
1064                 map_write(map, CMD(0x70), adr);
1065                 chip->state = FL_STATUS;
1066
1067         case FL_STATUS:
1068                 status = map_read(map, adr);
1069                 if (map_word_andequal(map, status, status_OK, status_OK))
1070                         break;
1071
1072                 /* Urgh. Chip not yet ready to talk to us. */
1073                 if (time_after(jiffies, timeo)) {
1074                         spin_unlock_bh(chip->mutex);
1075                         printk(KERN_ERR "waiting for chip to be ready timed out in lock\n");
1076                         return -EIO;
1077                 }
1078
1079                 /* Latency issues. Drop the lock, wait a while and retry */
1080                 spin_unlock_bh(chip->mutex);
1081                 cfi_udelay(1);
1082                 goto retry;
1083
1084         default:
1085                 /* Stick ourselves on a wait queue to be woken when
1086                    someone changes the status */
1087                 set_current_state(TASK_UNINTERRUPTIBLE);
1088                 add_wait_queue(&chip->wq, &wait);
1089                 spin_unlock_bh(chip->mutex);
1090                 schedule();
1091                 remove_wait_queue(&chip->wq, &wait);
1092                 timeo = jiffies + HZ;
1093                 goto retry;
1094         }
1095
1096         ENABLE_VPP(map);
1097         map_write(map, CMD(0x60), adr);
1098         map_write(map, CMD(0x01), adr);
1099         chip->state = FL_LOCKING;
1100
1101         spin_unlock_bh(chip->mutex);
1102         msleep(1000);
1103         spin_lock_bh(chip->mutex);
1104
1105         /* FIXME. Use a timer to check this, and return immediately. */
1106         /* Once the state machine's known to be working I'll do that */
1107
1108         timeo = jiffies + (HZ*2);
1109         for (;;) {
1110
1111                 status = map_read(map, adr);
1112                 if (map_word_andequal(map, status, status_OK, status_OK))
1113                         break;
1114
1115                 /* OK Still waiting */
1116                 if (time_after(jiffies, timeo)) {
1117                         map_write(map, CMD(0x70), adr);
1118                         chip->state = FL_STATUS;
1119                         printk(KERN_ERR "waiting for lock to complete timed out. Xstatus = %lx, status = %lx.\n", status.x[0], map_read(map, adr).x[0]);
1120                         DISABLE_VPP(map);
1121                         spin_unlock_bh(chip->mutex);
1122                         return -EIO;
1123                 }
1124
1125                 /* Latency issues. Drop the lock, wait a while and retry */
1126                 spin_unlock_bh(chip->mutex);
1127                 cfi_udelay(1);
1128                 spin_lock_bh(chip->mutex);
1129         }
1130
1131         /* Done and happy. */
1132         chip->state = FL_STATUS;
1133         DISABLE_VPP(map);
1134         wake_up(&chip->wq);
1135         spin_unlock_bh(chip->mutex);
1136         return 0;
1137 }
1138 static int cfi_staa_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
1139 {
1140         struct map_info *map = mtd->priv;
1141         struct cfi_private *cfi = map->fldrv_priv;
1142         unsigned long adr;
1143         int chipnum, ret = 0;
1144 #ifdef DEBUG_LOCK_BITS
1145         int ofs_factor = cfi->interleave * cfi->device_type;
1146 #endif
1147
1148         if (ofs & (mtd->erasesize - 1))
1149                 return -EINVAL;
1150
1151         if (len & (mtd->erasesize -1))
1152                 return -EINVAL;
1153
1154         if ((len + ofs) > mtd->size)
1155                 return -EINVAL;
1156
1157         chipnum = ofs >> cfi->chipshift;
1158         adr = ofs - (chipnum << cfi->chipshift);
1159
1160         while(len) {
1161
1162 #ifdef DEBUG_LOCK_BITS
1163                 cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi, cfi->device_type, NULL);
1164                 printk("before lock: block status register is %x\n",cfi_read_query(map, adr+(2*ofs_factor)));
1165                 cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi, cfi->device_type, NULL);
1166 #endif
1167
1168                 ret = do_lock_oneblock(map, &cfi->chips[chipnum], adr);
1169
1170 #ifdef DEBUG_LOCK_BITS
1171                 cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi, cfi->device_type, NULL);
1172                 printk("after lock: block status register is %x\n",cfi_read_query(map, adr+(2*ofs_factor)));
1173                 cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi, cfi->device_type, NULL);
1174 #endif
1175
1176                 if (ret)
1177                         return ret;
1178
1179                 adr += mtd->erasesize;
1180                 len -= mtd->erasesize;
1181
1182                 if (adr >> cfi->chipshift) {
1183                         adr = 0;
1184                         chipnum++;
1185
1186                         if (chipnum >= cfi->numchips)
1187                         break;
1188                 }
1189         }
1190         return 0;
1191 }
1192 static inline int do_unlock_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
1193 {
1194         struct cfi_private *cfi = map->fldrv_priv;
1195         map_word status, status_OK;
1196         unsigned long timeo = jiffies + HZ;
1197         DECLARE_WAITQUEUE(wait, current);
1198
1199         adr += chip->start;
1200
1201         /* Let's determine this according to the interleave only once */
1202         status_OK = CMD(0x80);
1203
1204         timeo = jiffies + HZ;
1205 retry:
1206         spin_lock_bh(chip->mutex);
1207
1208         /* Check that the chip's ready to talk to us. */
1209         switch (chip->state) {
1210         case FL_CFI_QUERY:
1211         case FL_JEDEC_QUERY:
1212         case FL_READY:
1213                 map_write(map, CMD(0x70), adr);
1214                 chip->state = FL_STATUS;
1215
1216         case FL_STATUS:
1217                 status = map_read(map, adr);
1218                 if (map_word_andequal(map, status, status_OK, status_OK))
1219                         break;
1220
1221                 /* Urgh. Chip not yet ready to talk to us. */
1222                 if (time_after(jiffies, timeo)) {
1223                         spin_unlock_bh(chip->mutex);
1224                         printk(KERN_ERR "waiting for chip to be ready timed out in unlock\n");
1225                         return -EIO;
1226                 }
1227
1228                 /* Latency issues. Drop the lock, wait a while and retry */
1229                 spin_unlock_bh(chip->mutex);
1230                 cfi_udelay(1);
1231                 goto retry;
1232
1233         default:
1234                 /* Stick ourselves on a wait queue to be woken when
1235                    someone changes the status */
1236                 set_current_state(TASK_UNINTERRUPTIBLE);
1237                 add_wait_queue(&chip->wq, &wait);
1238                 spin_unlock_bh(chip->mutex);
1239                 schedule();
1240                 remove_wait_queue(&chip->wq, &wait);
1241                 timeo = jiffies + HZ;
1242                 goto retry;
1243         }
1244
1245         ENABLE_VPP(map);
1246         map_write(map, CMD(0x60), adr);
1247         map_write(map, CMD(0xD0), adr);
1248         chip->state = FL_UNLOCKING;
1249
1250         spin_unlock_bh(chip->mutex);
1251         msleep(1000);
1252         spin_lock_bh(chip->mutex);
1253
1254         /* FIXME. Use a timer to check this, and return immediately. */
1255         /* Once the state machine's known to be working I'll do that */
1256
1257         timeo = jiffies + (HZ*2);
1258         for (;;) {
1259
1260                 status = map_read(map, adr);
1261                 if (map_word_andequal(map, status, status_OK, status_OK))
1262                         break;
1263
1264                 /* OK Still waiting */
1265                 if (time_after(jiffies, timeo)) {
1266                         map_write(map, CMD(0x70), adr);
1267                         chip->state = FL_STATUS;
1268                         printk(KERN_ERR "waiting for unlock to complete timed out. Xstatus = %lx, status = %lx.\n", status.x[0], map_read(map, adr).x[0]);
1269                         DISABLE_VPP(map);
1270                         spin_unlock_bh(chip->mutex);
1271                         return -EIO;
1272                 }
1273
1274                 /* Latency issues. Drop the unlock, wait a while and retry */
1275                 spin_unlock_bh(chip->mutex);
1276                 cfi_udelay(1);
1277                 spin_lock_bh(chip->mutex);
1278         }
1279
1280         /* Done and happy. */
1281         chip->state = FL_STATUS;
1282         DISABLE_VPP(map);
1283         wake_up(&chip->wq);
1284         spin_unlock_bh(chip->mutex);
1285         return 0;
1286 }
1287 static int cfi_staa_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1288 {
1289         struct map_info *map = mtd->priv;
1290         struct cfi_private *cfi = map->fldrv_priv;
1291         unsigned long adr;
1292         int chipnum, ret = 0;
1293 #ifdef DEBUG_LOCK_BITS
1294         int ofs_factor = cfi->interleave * cfi->device_type;
1295 #endif
1296
1297         chipnum = ofs >> cfi->chipshift;
1298         adr = ofs - (chipnum << cfi->chipshift);
1299
1300 #ifdef DEBUG_LOCK_BITS
1301         {
1302                 unsigned long temp_adr = adr;
1303                 unsigned long temp_len = len;
1304
1305                 cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi, cfi->device_type, NULL);
1306                 while (temp_len) {
1307                         printk("before unlock %x: block status register is %x\n",temp_adr,cfi_read_query(map, temp_adr+(2*ofs_factor)));
1308                         temp_adr += mtd->erasesize;
1309                         temp_len -= mtd->erasesize;
1310                 }
1311                 cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi, cfi->device_type, NULL);
1312         }
1313 #endif
1314
1315         ret = do_unlock_oneblock(map, &cfi->chips[chipnum], adr);
1316
1317 #ifdef DEBUG_LOCK_BITS
1318         cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi, cfi->device_type, NULL);
1319         printk("after unlock: block status register is %x\n",cfi_read_query(map, adr+(2*ofs_factor)));
1320         cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi, cfi->device_type, NULL);
1321 #endif
1322
1323         return ret;
1324 }
1325
1326 static int cfi_staa_suspend(struct mtd_info *mtd)
1327 {
1328         struct map_info *map = mtd->priv;
1329         struct cfi_private *cfi = map->fldrv_priv;
1330         int i;
1331         struct flchip *chip;
1332         int ret = 0;
1333
1334         for (i=0; !ret && i<cfi->numchips; i++) {
1335                 chip = &cfi->chips[i];
1336
1337                 spin_lock_bh(chip->mutex);
1338
1339                 switch(chip->state) {
1340                 case FL_READY:
1341                 case FL_STATUS:
1342                 case FL_CFI_QUERY:
1343                 case FL_JEDEC_QUERY:
1344                         chip->oldstate = chip->state;
1345                         chip->state = FL_PM_SUSPENDED;
1346                         /* No need to wake_up() on this state change -
1347                          * as the whole point is that nobody can do anything
1348                          * with the chip now anyway.
1349                          */
1350                 case FL_PM_SUSPENDED:
1351                         break;
1352
1353                 default:
1354                         ret = -EAGAIN;
1355                         break;
1356                 }
1357                 spin_unlock_bh(chip->mutex);
1358         }
1359
1360         /* Unlock the chips again */
1361
1362         if (ret) {
1363                 for (i--; i >=0; i--) {
1364                         chip = &cfi->chips[i];
1365
1366                         spin_lock_bh(chip->mutex);
1367
1368                         if (chip->state == FL_PM_SUSPENDED) {
1369                                 /* No need to force it into a known state here,
1370                                    because we're returning failure, and it didn't
1371                                    get power cycled */
1372                                 chip->state = chip->oldstate;
1373                                 wake_up(&chip->wq);
1374                         }
1375                         spin_unlock_bh(chip->mutex);
1376                 }
1377         }
1378
1379         return ret;
1380 }
1381
1382 static void cfi_staa_resume(struct mtd_info *mtd)
1383 {
1384         struct map_info *map = mtd->priv;
1385         struct cfi_private *cfi = map->fldrv_priv;
1386         int i;
1387         struct flchip *chip;
1388
1389         for (i=0; i<cfi->numchips; i++) {
1390
1391                 chip = &cfi->chips[i];
1392
1393                 spin_lock_bh(chip->mutex);
1394
1395                 /* Go to known state. Chip may have been power cycled */
1396                 if (chip->state == FL_PM_SUSPENDED) {
1397                         map_write(map, CMD(0xFF), 0);
1398                         chip->state = FL_READY;
1399                         wake_up(&chip->wq);
1400                 }
1401
1402                 spin_unlock_bh(chip->mutex);
1403         }
1404 }
1405
1406 static void cfi_staa_destroy(struct mtd_info *mtd)
1407 {
1408         struct map_info *map = mtd->priv;
1409         struct cfi_private *cfi = map->fldrv_priv;
1410         kfree(cfi->cmdset_priv);
1411         kfree(cfi);
1412 }
1413
1414 MODULE_LICENSE("GPL");