drivers/mtd/chips/cfi_cmdset_0002.c

   1 /*
   2  * Common Flash Interface support:
   3  *   AMD & Fujitsu Standard Vendor Command Set (ID 0x0002)
   4  *
   5  * Copyright (C) 2000 Crossnet Co. <info@crossnet.co.jp>
   6  * Copyright (C) 2004 Arcom Control Systems Ltd <linux@arcom.com>
   7  *
   8  * 2_by_8 routines added by Simon Munton
   9  *
  10  * 4_by_16 work by Carolyn J. Smith
  11  *
  12  * Occasionally maintained by Thayne Harbaugh tharbaugh at lnxi dot com
  13  *
  14  * This code is GPL
  15  *
  16  * $Id: cfi_cmdset_0002.c,v 1.114 2004/12/11 15:43:53 dedekind Exp $
  17  *
  18  */
  19
  20 #include <linux/config.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/init.h>
  26 #include <asm/io.h>
  27 #include <asm/byteorder.h>
  28
  29 #include <linux/errno.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/mtd/compatmac.h>
  34 #include <linux/mtd/map.h>
  35 #include <linux/mtd/mtd.h>
  36 #include <linux/mtd/cfi.h>
  37
  38 #define AMD_BOOTLOC_BUG
  39 #define FORCE_WORD_WRITE 0
  40
  41 #define MAX_WORD_RETRIES 3
  42
  43 #define MANUFACTURER_AMD        0x0001
  44 #define MANUFACTURER_SST        0x00BF
  45 #define SST49LF004B             0x0060
  46
  47 static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
  48 static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
  49 static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
  50 static int cfi_amdstd_erase_chip(struct mtd_info *, struct erase_info *);
  51 static int cfi_amdstd_erase_varsize(struct mtd_info *, struct erase_info *);
  52 static void cfi_amdstd_sync (struct mtd_info *);
  53 static int cfi_amdstd_suspend (struct mtd_info *);
  54 static void cfi_amdstd_resume (struct mtd_info *);
  55 static int cfi_amdstd_secsi_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
  56
  57 static void cfi_amdstd_destroy(struct mtd_info *);
  58
  59 struct mtd_info *cfi_cmdset_0002(struct map_info *, int);
  60 static struct mtd_info *cfi_amdstd_setup (struct mtd_info *);
  61
  62 static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode);
  63 static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr);
  64 #include "fwh_lock.h"
  65
  66 static struct mtd_chip_driver cfi_amdstd_chipdrv = {
  67         .probe          = NULL, /* Not usable directly */
  68         .destroy        = cfi_amdstd_destroy,
  69         .name           = "cfi_cmdset_0002",
  70         .module         = THIS_MODULE
  71 };
  72
  73
  74 /* #define DEBUG_CFI_FEATURES */
  75
  76
  77 #ifdef DEBUG_CFI_FEATURES
  78 static void cfi_tell_features(struct cfi_pri_amdstd *extp)
  79 {
  80         const char* erase_suspend[3] = {
  81                 "Not supported", "Read only", "Read/write"
  82         };
  83         const char* top_bottom[6] = {
  84                 "No WP", "8x8KiB sectors at top & bottom, no WP",
  85                 "Bottom boot", "Top boot",
  86                 "Uniform, Bottom WP", "Uniform, Top WP"
  87         };
  88
  89         printk("  Silicon revision: %d\n", extp->SiliconRevision >> 1);
  90         printk("  Address sensitive unlock: %s\n",
  91                (extp->SiliconRevision & 1) ? "Not required" : "Required");
  92
  93         if (extp->EraseSuspend < ARRAY_SIZE(erase_suspend))
  94                 printk("  Erase Suspend: %s\n", erase_suspend[extp->EraseSuspend]);
  95         else
  96                 printk("  Erase Suspend: Unknown value %d\n", extp->EraseSuspend);
  97
  98         if (extp->BlkProt == 0)
  99                 printk("  Block protection: Not supported\n");
 100         else
 101                 printk("  Block protection: %d sectors per group\n", extp->BlkProt);
 102
 103
 104         printk("  Temporary block unprotect: %s\n",
 105                extp->TmpBlkUnprotect ? "Supported" : "Not supported");
 106         printk("  Block protect/unprotect scheme: %d\n", extp->BlkProtUnprot);
 107         printk("  Number of simultaneous operations: %d\n", extp->SimultaneousOps);
 108         printk("  Burst mode: %s\n",
 109                extp->BurstMode ? "Supported" : "Not supported");
 110         if (extp->PageMode == 0)
 111                 printk("  Page mode: Not supported\n");
 112         else
 113                 printk("  Page mode: %d word page\n", extp->PageMode << 2);
 114
 115         printk("  Vpp Supply Minimum Program/Erase Voltage: %d.%d V\n",
 116                extp->VppMin >> 4, extp->VppMin & 0xf);
 117         printk("  Vpp Supply Maximum Program/Erase Voltage: %d.%d V\n",
 118                extp->VppMax >> 4, extp->VppMax & 0xf);
 119
 120         if (extp->TopBottom < ARRAY_SIZE(top_bottom))
 121                 printk("  Top/Bottom Boot Block: %s\n", top_bottom[extp->TopBottom]);
 122         else
 123                 printk("  Top/Bottom Boot Block: Unknown value %d\n", extp->TopBottom);
 124 }
 125 #endif
 126
 127 #ifdef AMD_BOOTLOC_BUG
 128 /* Wheee. Bring me the head of someone at AMD. */
 129 static void fixup_amd_bootblock(struct mtd_info *mtd, void* param)
 130 {
 131         struct map_info *map = mtd->priv;
 132         struct cfi_private *cfi = map->fldrv_priv;
 133         struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
 134         __u8 major = extp->MajorVersion;
 135         __u8 minor = extp->MinorVersion;
 136
 137         if (((major << 8) | minor) < 0x3131) {
 138                 /* CFI version 1.0 => don't trust bootloc */
 139                 if (cfi->id & 0x80) {
 140                         printk(KERN_WARNING "%s: JEDEC Device ID is 0x%02X. Assuming broken CFI table.\n", map->name, cfi->id);
 141                         extp->TopBottom = 3;    /* top boot */
 142                 } else {
 143                         extp->TopBottom = 2;    /* bottom boot */
 144                 }
 145         }
 146 }
 147 #endif
 148
 149 static void fixup_use_write_buffers(struct mtd_info *mtd, void *param)
 150 {
 151         struct map_info *map = mtd->priv;
 152         struct cfi_private *cfi = map->fldrv_priv;
 153         if (cfi->cfiq->BufWriteTimeoutTyp) {
 154                 DEBUG(MTD_DEBUG_LEVEL1, "Using buffer write method\n" );
 155                 mtd->write = cfi_amdstd_write_buffers;
 156         }
 157 }
 158
 159 static void fixup_use_secsi(struct mtd_info *mtd, void *param)
 160 {
 161         /* Setup for chips with a secsi area */
 162         mtd->read_user_prot_reg = cfi_amdstd_secsi_read;
 163         mtd->read_fact_prot_reg = cfi_amdstd_secsi_read;
 164 }
 165
 166 static void fixup_use_erase_chip(struct mtd_info *mtd, void *param)
 167 {
 168         struct map_info *map = mtd->priv;
 169         struct cfi_private *cfi = map->fldrv_priv;
 170         if ((cfi->cfiq->NumEraseRegions == 1) &&
 171                 ((cfi->cfiq->EraseRegionInfo[0] & 0xffff) == 0)) {
 172                 mtd->erase = cfi_amdstd_erase_chip;
 173         }
 174
 175 }
 176
 177 static struct cfi_fixup cfi_fixup_table[] = {
 178 #ifdef AMD_BOOTLOC_BUG
 179         { CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock, NULL },
 180 #endif
 181         { CFI_MFR_AMD, 0x0050, fixup_use_secsi, NULL, },
 182         { CFI_MFR_AMD, 0x0053, fixup_use_secsi, NULL, },
 183         { CFI_MFR_AMD, 0x0055, fixup_use_secsi, NULL, },
 184         { CFI_MFR_AMD, 0x0056, fixup_use_secsi, NULL, },
 185         { CFI_MFR_AMD, 0x005C, fixup_use_secsi, NULL, },
 186         { CFI_MFR_AMD, 0x005F, fixup_use_secsi, NULL, },
 187 #if !FORCE_WORD_WRITE
 188         { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL, },
 189 #endif
 190         { 0, 0, NULL, NULL }
 191 };
 192 static struct cfi_fixup jedec_fixup_table[] = {
 193         { MANUFACTURER_SST, SST49LF004B, fixup_use_fwh_lock, NULL, },
 194         { 0, 0, NULL, NULL }
 195 };
 196
 197 static struct cfi_fixup fixup_table[] = {
 198         /* The CFI vendor ids and the JEDEC vendor IDs appear
 199          * to be common.  It is like the devices id's are as
 200          * well.  This table is to pick all cases where
 201          * we know that is the case.
 202          */
 203         { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_erase_chip, NULL },
 204         { 0, 0, NULL, NULL }
 205 };
 206
 207
 208 struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
 209 {
 210         struct cfi_private *cfi = map->fldrv_priv;
 211         struct mtd_info *mtd;
 212         int i;
 213
 214         mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
 215         if (!mtd) {
 216                 printk(KERN_WARNING "Failed to allocate memory for MTD device\n");
 217                 return NULL;
 218         }
 219         memset(mtd, 0, sizeof(*mtd));
 220         mtd->priv = map;
 221         mtd->type = MTD_NORFLASH;
 222
 223         /* Fill in the default mtd operations */
 224         mtd->erase   = cfi_amdstd_erase_varsize;
 225         mtd->write   = cfi_amdstd_write_words;
 226         mtd->read    = cfi_amdstd_read;
 227         mtd->sync    = cfi_amdstd_sync;
 228         mtd->suspend = cfi_amdstd_suspend;
 229         mtd->resume  = cfi_amdstd_resume;
 230         mtd->flags   = MTD_CAP_NORFLASH;
 231         mtd->name    = map->name;
 232
 233         if (cfi->cfi_mode==CFI_MODE_CFI){
 234                 unsigned char bootloc;
 235                 /*
 236                  * It's a real CFI chip, not one for which the probe
 237                  * routine faked a CFI structure. So we read the feature
 238                  * table from it.
 239                  */
 240                 __u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
 241                 struct cfi_pri_amdstd *extp;
 242
 243                 extp = (struct cfi_pri_amdstd*)cfi_read_pri(map, adr, sizeof(*extp), "Amd/Fujitsu");
 244                 if (!extp) {
 245                         kfree(mtd);
 246                         return NULL;
 247                 }
 248
 249                 /* Install our own private info structure */
 250                 cfi->cmdset_priv = extp;
 251
 252                 /* Apply cfi device specific fixups */
 253                 cfi_fixup(mtd, cfi_fixup_table);
 254
 255 #ifdef DEBUG_CFI_FEATURES
 256                 /* Tell the user about it in lots of lovely detail */
 257                 cfi_tell_features(extp);
 258 #endif
 259
 260                 bootloc = extp->TopBottom;
 261                 if ((bootloc != 2) && (bootloc != 3)) {
 262                         printk(KERN_WARNING "%s: CFI does not contain boot "
 263                                "bank location. Assuming top.\n", map->name);
 264                         bootloc = 2;
 265                 }
 266
 267                 if (bootloc == 3 && cfi->cfiq->NumEraseRegions > 1) {
 268                         printk(KERN_WARNING "%s: Swapping erase regions for broken CFI table.\n", map->name);
 269
 270                         for (i=0; i<cfi->cfiq->NumEraseRegions / 2; i++) {
 271                                 int j = (cfi->cfiq->NumEraseRegions-1)-i;
 272                                 __u32 swap;
 273
 274                                 swap = cfi->cfiq->EraseRegionInfo[i];
 275                                 cfi->cfiq->EraseRegionInfo[i] = cfi->cfiq->EraseRegionInfo[j];
 276                                 cfi->cfiq->EraseRegionInfo[j] = swap;
 277                         }
 278                 }
 279                 /* Set the default CFI lock/unlock addresses */
 280                 cfi->addr_unlock1 = 0x555;
 281                 cfi->addr_unlock2 = 0x2aa;
 282                 /* Modify the unlock address if we are in compatibility mode */
 283                 if (    /* x16 in x8 mode */
 284                         ((cfi->device_type == CFI_DEVICETYPE_X8) &&
 285                                 (cfi->cfiq->InterfaceDesc == 2)) ||
 286                         /* x32 in x16 mode */
 287                         ((cfi->device_type == CFI_DEVICETYPE_X16) &&
 288                                 (cfi->cfiq->InterfaceDesc == 4)))
 289                 {
 290                         cfi->addr_unlock1 = 0xaaa;
 291                         cfi->addr_unlock2 = 0x555;
 292                 }
 293
 294         } /* CFI mode */
 295         else if (cfi->cfi_mode == CFI_MODE_JEDEC) {
 296                 /* Apply jedec specific fixups */
 297                 cfi_fixup(mtd, jedec_fixup_table);
 298         }
 299         /* Apply generic fixups */
 300         cfi_fixup(mtd, fixup_table);
 301
 302         for (i=0; i< cfi->numchips; i++) {
 303                 cfi->chips[i].word_write_time = 1<<cfi->cfiq->WordWriteTimeoutTyp;
 304                 cfi->chips[i].buffer_write_time = 1<<cfi->cfiq->BufWriteTimeoutTyp;
 305                 cfi->chips[i].erase_time = 1<<cfi->cfiq->BlockEraseTimeoutTyp;
 306         }
 307
 308         map->fldrv = &cfi_amdstd_chipdrv;
 309
 310         return cfi_amdstd_setup(mtd);
 311 }
 312
 313
 314 static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
 315 {
 316         struct map_info *map = mtd->priv;
 317         struct cfi_private *cfi = map->fldrv_priv;
 318         unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;
 319         unsigned long offset = 0;
 320         int i,j;
 321
 322         printk(KERN_NOTICE "number of %s chips: %d\n",
 323                (cfi->cfi_mode == CFI_MODE_CFI)?"CFI":"JEDEC",cfi->numchips);
 324         /* Select the correct geometry setup */
 325         mtd->size = devsize * cfi->numchips;
 326
 327         mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
 328         mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info)
 329                                     * mtd->numeraseregions, GFP_KERNEL);
 330         if (!mtd->eraseregions) {
 331                 printk(KERN_WARNING "Failed to allocate memory for MTD erase region info\n");
 332                 goto setup_err;
 333         }
 334
 335         for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
 336                 unsigned long ernum, ersize;
 337                 ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave;
 338                 ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1;
 339
 340                 if (mtd->erasesize < ersize) {
 341                         mtd->erasesize = ersize;
 342                 }
 343                 for (j=0; j<cfi->numchips; j++) {
 344                         mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset;
 345                         mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
 346                         mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
 347                 }
 348                 offset += (ersize * ernum);
 349         }
 350         if (offset != devsize) {
 351                 /* Argh */
 352                 printk(KERN_WARNING "Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize);
 353                 goto setup_err;
 354         }
 355 #if 0
 356         // debug
 357         for (i=0; i<mtd->numeraseregions;i++){
 358                 printk("%d: offset=0x%x,size=0x%x,blocks=%d\n",
 359                        i,mtd->eraseregions[i].offset,
 360                        mtd->eraseregions[i].erasesize,
 361                        mtd->eraseregions[i].numblocks);
 362         }
 363 #endif
 364
 365         /* FIXME: erase-suspend-program is broken.  See
 366            http://lists.infradead.org/pipermail/linux-mtd/2003-December/009001.html */
 367         printk(KERN_NOTICE "cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.\n");
 368
 369         __module_get(THIS_MODULE);
 370         return mtd;
 371
 372  setup_err:
 373         if(mtd) {
 374                 if(mtd->eraseregions)
 375                         kfree(mtd->eraseregions);
 376                 kfree(mtd);
 377         }
 378         kfree(cfi->cmdset_priv);
 379         kfree(cfi->cfiq);
 380         return NULL;
 381 }
 382
 383 /*
 384  * Return true if the chip is ready.
 385  *
 386  * Ready is one of: read mode, query mode, erase-suspend-read mode (in any
 387  * non-suspended sector) and is indicated by no toggle bits toggling.
 388  *
 389  * Note that anything more complicated than checking if no bits are toggling
 390  * (including checking DQ5 for an error status) is tricky to get working
 391  * correctly and is therefore not done  (particulary with interleaved chips
 392  * as each chip must be checked independantly of the others).
 393  */
 394 static int chip_ready(struct map_info *map, unsigned long addr)
 395 {
 396         map_word d, t;
 397
 398         d = map_read(map, addr);
 399         t = map_read(map, addr);
 400
 401         return map_word_equal(map, d, t);
 402 }
 403
 404 static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode)
 405 {
 406         DECLARE_WAITQUEUE(wait, current);
 407         struct cfi_private *cfi = map->fldrv_priv;
 408         unsigned long timeo;
 409         struct cfi_pri_amdstd *cfip = (struct cfi_pri_amdstd *)cfi->cmdset_priv;
 410
 411  resettime:
 412         timeo = jiffies + HZ;
 413  retry:
 414         switch (chip->state) {
 415
 416         case FL_STATUS:
 417                 for (;;) {
 418                         if (chip_ready(map, adr))
 419                                 break;
 420
 421                         if (time_after(jiffies, timeo)) {
 422                                 printk(KERN_ERR "Waiting for chip to be ready timed out.\n");
 423                                 cfi_spin_unlock(chip->mutex);
 424                                 return -EIO;
 425                         }
 426                         cfi_spin_unlock(chip->mutex);
 427                         cfi_udelay(1);
 428                         cfi_spin_lock(chip->mutex);
 429                         /* Someone else might have been playing with it. */
 430                         goto retry;
 431                 }
 432
 433         case FL_READY:
 434         case FL_CFI_QUERY:
 435         case FL_JEDEC_QUERY:
 436                 return 0;
 437
 438         case FL_ERASING:
 439                 if (mode == FL_WRITING) /* FIXME: Erase-suspend-program appears broken. */
 440                         goto sleep;
 441
 442                 if (!(mode == FL_READY || mode == FL_POINT
 443                       || !cfip
 444                       || (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))
 445                       || (mode == FL_WRITING && (cfip->EraseSuspend & 0x1))))
 446                         goto sleep;
 447
 448                 /* We could check to see if we're trying to access the sector
 449                  * that is currently being erased. However, no user will try
 450                  * anything like that so we just wait for the timeout. */
 451
 452                 /* Erase suspend */
 453                 /* It's harmless to issue the Erase-Suspend and Erase-Resume
 454                  * commands when the erase algorithm isn't in progress. */
 455                 map_write(map, CMD(0xB0), chip->in_progress_block_addr);
 456                 chip->oldstate = FL_ERASING;
 457                 chip->state = FL_ERASE_SUSPENDING;
 458                 chip->erase_suspended = 1;
 459                 for (;;) {
 460                         if (chip_ready(map, adr))
 461                                 break;
 462
 463                         if (time_after(jiffies, timeo)) {
 464                                 /* Should have suspended the erase by now.
 465                                  * Send an Erase-Resume command as either
 466                                  * there was an error (so leave the erase
 467                                  * routine to recover from it) or we trying to
 468                                  * use the erase-in-progress sector. */
 469                                 map_write(map, CMD(0x30), chip->in_progress_block_addr);
 470                                 chip->state = FL_ERASING;
 471                                 chip->oldstate = FL_READY;
 472                                 printk(KERN_ERR "MTD %s(): chip not ready after erase suspend\n", __func__);
 473                                 return -EIO;
 474                         }
 475
 476                         cfi_spin_unlock(chip->mutex);
 477                         cfi_udelay(1);
 478                         cfi_spin_lock(chip->mutex);
 479                         /* Nobody will touch it while it's in state FL_ERASE_SUSPENDING.
 480                            So we can just loop here. */
 481                 }
 482                 chip->state = FL_READY;
 483                 return 0;
 484
 485         case FL_POINT:
 486                 /* Only if there's no operation suspended... */
 487                 if (mode == FL_READY && chip->oldstate == FL_READY)
 488                         return 0;
 489
 490         default:
 491         sleep:
 492                 set_current_state(TASK_UNINTERRUPTIBLE);
 493                 add_wait_queue(&chip->wq, &wait);
 494                 cfi_spin_unlock(chip->mutex);
 495                 schedule();
 496                 remove_wait_queue(&chip->wq, &wait);
 497                 cfi_spin_lock(chip->mutex);
 498                 goto resettime;
 499         }
 500 }
 501
 502
 503 static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr)
 504 {
 505         struct cfi_private *cfi = map->fldrv_priv;
 506
 507         switch(chip->oldstate) {
 508         case FL_ERASING:
 509                 chip->state = chip->oldstate;
 510                 map_write(map, CMD(0x30), chip->in_progress_block_addr);
 511                 chip->oldstate = FL_READY;
 512                 chip->state = FL_ERASING;
 513                 break;
 514
 515         case FL_READY:
 516         case FL_STATUS:
 517                 /* We should really make set_vpp() count, rather than doing this */
 518                 DISABLE_VPP(map);
 519                 break;
 520         default:
 521                 printk(KERN_ERR "MTD: put_chip() called with oldstate %d!!\n", chip->oldstate);
 522         }
 523         wake_up(&chip->wq);
 524 }
 525
 526
 527 static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
 528 {
 529         unsigned long cmd_addr;
 530         struct cfi_private *cfi = map->fldrv_priv;
 531         int ret;
 532
 533         adr += chip->start;
 534
 535         /* Ensure cmd read/writes are aligned. */
 536         cmd_addr = adr & ~(map_bankwidth(map)-1);
 537
 538         cfi_spin_lock(chip->mutex);
 539         ret = get_chip(map, chip, cmd_addr, FL_READY);
 540         if (ret) {
 541                 cfi_spin_unlock(chip->mutex);
 542                 return ret;
 543         }
 544
 545         if (chip->state != FL_POINT && chip->state != FL_READY) {
 546                 map_write(map, CMD(0xf0), cmd_addr);
 547                 chip->state = FL_READY;
 548         }
 549
 550         map_copy_from(map, buf, adr, len);
 551
 552         put_chip(map, chip, cmd_addr);
 553
 554         cfi_spin_unlock(chip->mutex);
 555         return 0;
 556 }
 557
 558
 559 static int cfi_amdstd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
 560 {
 561         struct map_info *map = mtd->priv;
 562         struct cfi_private *cfi = map->fldrv_priv;
 563         unsigned long ofs;
 564         int chipnum;
 565         int ret = 0;
 566
 567         /* ofs: offset within the first chip that the first read should start */
 568
 569         chipnum = (from >> cfi->chipshift);
 570         ofs = from - (chipnum <<  cfi->chipshift);
 571
 572
 573         *retlen = 0;
 574
 575         while (len) {
 576                 unsigned long thislen;
 577
 578                 if (chipnum >= cfi->numchips)
 579                         break;
 580
 581                 if ((len + ofs -1) >> cfi->chipshift)
 582                         thislen = (1<<cfi->chipshift) - ofs;
 583                 else
 584                         thislen = len;
 585
 586                 ret = do_read_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf);
 587                 if (ret)
 588                         break;
 589
 590                 *retlen += thislen;
 591                 len -= thislen;
 592                 buf += thislen;
 593
 594                 ofs = 0;
 595                 chipnum++;
 596         }
 597         return ret;
 598 }
 599
 600
 601 static inline int do_read_secsi_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
 602 {
 603         DECLARE_WAITQUEUE(wait, current);
 604         unsigned long timeo = jiffies + HZ;
 605         struct cfi_private *cfi = map->fldrv_priv;
 606
 607  retry:
 608         cfi_spin_lock(chip->mutex);
 609
 610         if (chip->state != FL_READY){
 611 #if 0
 612                 printk(KERN_DEBUG "Waiting for chip to read, status = %d\n", chip->state);
 613 #endif
 614                 set_current_state(TASK_UNINTERRUPTIBLE);
 615                 add_wait_queue(&chip->wq, &wait);
 616
 617                 cfi_spin_unlock(chip->mutex);
 618
 619                 schedule();
 620                 remove_wait_queue(&chip->wq, &wait);
 621 #if 0
 622                 if(signal_pending(current))
 623                         return -EINTR;
 624 #endif
 625                 timeo = jiffies + HZ;
 626
 627                 goto retry;
 628         }
 629
 630         adr += chip->start;
 631
 632         chip->state = FL_READY;
 633
 634         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 635         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
 636         cfi_send_gen_cmd(0x88, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 637
 638         map_copy_from(map, buf, adr, len);
 639
 640         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 641         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
 642         cfi_send_gen_cmd(0x90, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 643         cfi_send_gen_cmd(0x00, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 644
 645         wake_up(&chip->wq);
 646         cfi_spin_unlock(chip->mutex);
 647
 648         return 0;
 649 }
 650
 651 static int cfi_amdstd_secsi_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
 652 {
 653         struct map_info *map = mtd->priv;
 654         struct cfi_private *cfi = map->fldrv_priv;
 655         unsigned long ofs;
 656         int chipnum;
 657         int ret = 0;
 658
 659
 660         /* ofs: offset within the first chip that the first read should start */
 661
 662         /* 8 secsi bytes per chip */
 663         chipnum=from>>3;
 664         ofs=from & 7;
 665
 666
 667         *retlen = 0;
 668
 669         while (len) {
 670                 unsigned long thislen;
 671
 672                 if (chipnum >= cfi->numchips)
 673                         break;
 674
 675                 if ((len + ofs -1) >> 3)
 676                         thislen = (1<<3) - ofs;
 677                 else
 678                         thislen = len;
 679
 680                 ret = do_read_secsi_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf);
 681                 if (ret)
 682                         break;
 683
 684                 *retlen += thislen;
 685                 len -= thislen;
 686                 buf += thislen;
 687
 688                 ofs = 0;
 689                 chipnum++;
 690         }
 691         return ret;
 692 }
 693
 694
 695 static int do_write_oneword(struct map_info *map, struct flchip *chip, unsigned long adr, map_word datum)
 696 {
 697         struct cfi_private *cfi = map->fldrv_priv;
 698         unsigned long timeo = jiffies + HZ;
 699         /*
 700          * We use a 1ms + 1 jiffies generic timeout for writes (most devices
 701          * have a max write time of a few hundreds usec). However, we should
 702          * use the maximum timeout value given by the chip at probe time
 703          * instead.  Unfortunately, struct flchip does have a field for
 704          * maximum timeout, only for typical which can be far too short
 705          * depending of the conditions.  The ' + 1' is to avoid having a
 706          * timeout of 0 jiffies if HZ is smaller than 1000.
 707          */
 708         unsigned long uWriteTimeout = ( HZ / 1000 ) + 1;
 709         int ret = 0;
 710         map_word oldd;
 711         int retry_cnt = 0;
 712
 713         adr += chip->start;
 714
 715         cfi_spin_lock(chip->mutex);
 716         ret = get_chip(map, chip, adr, FL_WRITING);
 717         if (ret) {
 718                 cfi_spin_unlock(chip->mutex);
 719                 return ret;
 720         }
 721
 722         DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
 723                __func__, adr, datum.x[0] );
 724
 725         /*
 726          * Check for a NOP for the case when the datum to write is already
 727          * present - it saves time and works around buggy chips that corrupt
 728          * data at other locations when 0xff is written to a location that
 729          * already contains 0xff.
 730          */
 731         oldd = map_read(map, adr);
 732         if (map_word_equal(map, oldd, datum)) {
 733                 DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): NOP\n",
 734                        __func__);
 735                 goto op_done;
 736         }
 737
 738         ENABLE_VPP(map);
 739  retry:
 740         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 741         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
 742         cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 743         map_write(map, datum, adr);
 744         chip->state = FL_WRITING;
 745
 746         cfi_spin_unlock(chip->mutex);
 747         cfi_udelay(chip->word_write_time);
 748         cfi_spin_lock(chip->mutex);
 749
 750         /* See comment above for timeout value. */
 751         timeo = jiffies + uWriteTimeout;
 752         for (;;) {
 753                 if (chip->state != FL_WRITING) {
 754                         /* Someone's suspended the write. Sleep */
 755                         DECLARE_WAITQUEUE(wait, current);
 756
 757                         set_current_state(TASK_UNINTERRUPTIBLE);
 758                         add_wait_queue(&chip->wq, &wait);
 759                         cfi_spin_unlock(chip->mutex);
 760                         schedule();
 761                         remove_wait_queue(&chip->wq, &wait);
 762                         timeo = jiffies + (HZ / 2); /* FIXME */
 763                         cfi_spin_lock(chip->mutex);
 764                         continue;
 765                 }
 766
 767                 if (chip_ready(map, adr))
 768                         goto op_done;
 769
 770                 if (time_after(jiffies, timeo))
 771                         break;
 772
 773                 /* Latency issues. Drop the lock, wait a while and retry */
 774                 cfi_spin_unlock(chip->mutex);
 775                 cfi_udelay(1);
 776                 cfi_spin_lock(chip->mutex);
 777         }
 778
 779         printk(KERN_WARNING "MTD %s(): software timeout\n", __func__);
 780
 781         /* reset on all failures. */
 782         map_write( map, CMD(0xF0), chip->start );
 783         /* FIXME - should have reset delay before continuing */
 784         if (++retry_cnt <= MAX_WORD_RETRIES)
 785                 goto retry;
 786
 787         ret = -EIO;
 788  op_done:
 789         chip->state = FL_READY;
 790         put_chip(map, chip, adr);
 791         cfi_spin_unlock(chip->mutex);
 792
 793         return ret;
 794 }
 795
 796
 797 static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len,
 798                                   size_t *retlen, const u_char *buf)
 799 {
 800         struct map_info *map = mtd->priv;
 801         struct cfi_private *cfi = map->fldrv_priv;
 802         int ret = 0;
 803         int chipnum;
 804         unsigned long ofs, chipstart;
 805         DECLARE_WAITQUEUE(wait, current);
 806
 807         *retlen = 0;
 808         if (!len)
 809                 return 0;
 810
 811         chipnum = to >> cfi->chipshift;
 812         ofs = to  - (chipnum << cfi->chipshift);
 813         chipstart = cfi->chips[chipnum].start;
 814
 815         /* If it's not bus-aligned, do the first byte write */
 816         if (ofs & (map_bankwidth(map)-1)) {
 817                 unsigned long bus_ofs = ofs & ~(map_bankwidth(map)-1);
 818                 int i = ofs - bus_ofs;
 819                 int n = 0;
 820                 map_word tmp_buf;
 821
 822  retry:
 823                 cfi_spin_lock(cfi->chips[chipnum].mutex);
 824
 825                 if (cfi->chips[chipnum].state != FL_READY) {
 826 #if 0
 827                         printk(KERN_DEBUG "Waiting for chip to write, status = %d\n", cfi->chips[chipnum].state);
 828 #endif
 829                         set_current_state(TASK_UNINTERRUPTIBLE);
 830                         add_wait_queue(&cfi->chips[chipnum].wq, &wait);
 831
 832                         cfi_spin_unlock(cfi->chips[chipnum].mutex);
 833
 834                         schedule();
 835                         remove_wait_queue(&cfi->chips[chipnum].wq, &wait);
 836 #if 0
 837                         if(signal_pending(current))
 838                                 return -EINTR;
 839 #endif
 840                         goto retry;
 841                 }
 842
 843                 /* Load 'tmp_buf' with old contents of flash */
 844                 tmp_buf = map_read(map, bus_ofs+chipstart);
 845
 846                 cfi_spin_unlock(cfi->chips[chipnum].mutex);
 847
 848                 /* Number of bytes to copy from buffer */
 849                 n = min_t(int, len, map_bankwidth(map)-i);
 850
 851                 tmp_buf = map_word_load_partial(map, tmp_buf, buf, i, n);
 852
 853                 ret = do_write_oneword(map, &cfi->chips[chipnum],
 854                                        bus_ofs, tmp_buf);
 855                 if (ret)
 856                         return ret;
 857
 858                 ofs += n;
 859                 buf += n;
 860                 (*retlen) += n;
 861                 len -= n;
 862
 863                 if (ofs >> cfi->chipshift) {
 864                         chipnum ++;
 865                         ofs = 0;
 866                         if (chipnum == cfi->numchips)
 867                                 return 0;
 868                 }
 869         }
 870
 871         /* We are now aligned, write as much as possible */
 872         while(len >= map_bankwidth(map)) {
 873                 map_word datum;
 874
 875                 datum = map_word_load(map, buf);
 876
 877                 ret = do_write_oneword(map, &cfi->chips[chipnum],
 878                                        ofs, datum);
 879                 if (ret)
 880                         return ret;
 881
 882                 ofs += map_bankwidth(map);
 883                 buf += map_bankwidth(map);
 884                 (*retlen) += map_bankwidth(map);
 885                 len -= map_bankwidth(map);
 886
 887                 if (ofs >> cfi->chipshift) {
 888                         chipnum ++;
 889                         ofs = 0;
 890                         if (chipnum == cfi->numchips)
 891                                 return 0;
 892                         chipstart = cfi->chips[chipnum].start;
 893                 }
 894         }
 895
 896         /* Write the trailing bytes if any */
 897         if (len & (map_bankwidth(map)-1)) {
 898                 map_word tmp_buf;
 899
 900  retry1:
 901                 cfi_spin_lock(cfi->chips[chipnum].mutex);
 902
 903                 if (cfi->chips[chipnum].state != FL_READY) {
 904 #if 0
 905                         printk(KERN_DEBUG "Waiting for chip to write, status = %d\n", cfi->chips[chipnum].state);
 906 #endif
 907                         set_current_state(TASK_UNINTERRUPTIBLE);
 908                         add_wait_queue(&cfi->chips[chipnum].wq, &wait);
 909
 910                         cfi_spin_unlock(cfi->chips[chipnum].mutex);
 911
 912                         schedule();
 913                         remove_wait_queue(&cfi->chips[chipnum].wq, &wait);
 914 #if 0
 915                         if(signal_pending(current))
 916                                 return -EINTR;
 917 #endif
 918                         goto retry1;
 919                 }
 920
 921                 tmp_buf = map_read(map, ofs + chipstart);
 922
 923                 cfi_spin_unlock(cfi->chips[chipnum].mutex);
 924
 925                 tmp_buf = map_word_load_partial(map, tmp_buf, buf, 0, len);
 926
 927                 ret = do_write_oneword(map, &cfi->chips[chipnum],
 928                                 ofs, tmp_buf);
 929                 if (ret)
 930                         return ret;
 931
 932                 (*retlen) += len;
 933         }
 934
 935         return 0;
 936 }
 937
 938
 939 /*
 940  * FIXME: interleaved mode not tested, and probably not supported!
 941  */
 942 static inline int do_write_buffer(struct map_info *map, struct flchip *chip,
 943                                   unsigned long adr, const u_char *buf, int len)
 944 {
 945         struct cfi_private *cfi = map->fldrv_priv;
 946         unsigned long timeo = jiffies + HZ;
 947         /* see comments in do_write_oneword() regarding uWriteTimeo. */
 948         unsigned long uWriteTimeout = ( HZ / 1000 ) + 1;
 949         int ret = -EIO;
 950         unsigned long cmd_adr;
 951         int z, words;
 952         map_word datum;
 953
 954         adr += chip->start;
 955         cmd_adr = adr;
 956
 957         cfi_spin_lock(chip->mutex);
 958         ret = get_chip(map, chip, adr, FL_WRITING);
 959         if (ret) {
 960                 cfi_spin_unlock(chip->mutex);
 961                 return ret;
 962         }
 963
 964         datum = map_word_load(map, buf);
 965
 966         DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
 967                __func__, adr, datum.x[0] );
 968
 969         ENABLE_VPP(map);
 970         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 971         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
 972         //cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
 973
 974         /* Write Buffer Load */
 975         map_write(map, CMD(0x25), cmd_adr);
 976
 977         chip->state = FL_WRITING_TO_BUFFER;
 978
 979         /* Write length of data to come */
 980         words = len / map_bankwidth(map);
 981         map_write(map, CMD(words - 1), cmd_adr);
 982         /* Write data */
 983         z = 0;
 984         while(z < words * map_bankwidth(map)) {
 985                 datum = map_word_load(map, buf);
 986                 map_write(map, datum, adr + z);
 987
 988                 z += map_bankwidth(map);
 989                 buf += map_bankwidth(map);
 990         }
 991         z -= map_bankwidth(map);
 992
 993         adr += z;
 994
 995         /* Write Buffer Program Confirm: GO GO GO */
 996         map_write(map, CMD(0x29), cmd_adr);
 997         chip->state = FL_WRITING;
 998
 999         cfi_spin_unlock(chip->mutex);
1000         cfi_udelay(chip->buffer_write_time);
1001         cfi_spin_lock(chip->mutex);
1002
1003         timeo = jiffies + uWriteTimeout;
1004
1005         for (;;) {
1006                 if (chip->state != FL_WRITING) {
1007                         /* Someone's suspended the write. Sleep */
1008                         DECLARE_WAITQUEUE(wait, current);
1009
1010                         set_current_state(TASK_UNINTERRUPTIBLE);
1011                         add_wait_queue(&chip->wq, &wait);
1012                         cfi_spin_unlock(chip->mutex);
1013                         schedule();
1014                         remove_wait_queue(&chip->wq, &wait);
1015                         timeo = jiffies + (HZ / 2); /* FIXME */
1016                         cfi_spin_lock(chip->mutex);
1017                         continue;
1018                 }
1019
1020                 if (chip_ready(map, adr))
1021                         goto op_done;
1022
1023                 if( time_after(jiffies, timeo))
1024                         break;
1025
1026                 /* Latency issues. Drop the lock, wait a while and retry */
1027                 cfi_spin_unlock(chip->mutex);
1028                 cfi_udelay(1);
1029                 cfi_spin_lock(chip->mutex);
1030         }
1031
1032         printk(KERN_WARNING "MTD %s(): software timeout\n",
1033                __func__ );
1034
1035         /* reset on all failures. */
1036         map_write( map, CMD(0xF0), chip->start );
1037         /* FIXME - should have reset delay before continuing */
1038
1039         ret = -EIO;
1040  op_done:
1041         chip->state = FL_READY;
1042         put_chip(map, chip, adr);
1043         cfi_spin_unlock(chip->mutex);
1044
1045         return ret;
1046 }
1047
1048
1049 static int cfi_amdstd_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
1050                                     size_t *retlen, const u_char *buf)
1051 {
1052         struct map_info *map = mtd->priv;
1053         struct cfi_private *cfi = map->fldrv_priv;
1054         int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
1055         int ret = 0;
1056         int chipnum;
1057         unsigned long ofs;
1058
1059         *retlen = 0;
1060         if (!len)
1061                 return 0;
1062
1063         chipnum = to >> cfi->chipshift;
1064         ofs = to  - (chipnum << cfi->chipshift);
1065
1066         /* If it's not bus-aligned, do the first word write */
1067         if (ofs & (map_bankwidth(map)-1)) {
1068                 size_t local_len = (-ofs)&(map_bankwidth(map)-1);
1069                 if (local_len > len)
1070                         local_len = len;
1071                 ret = cfi_amdstd_write_words(mtd, ofs + (chipnum<<cfi->chipshift),
1072                                              local_len, retlen, buf);
1073                 if (ret)
1074                         return ret;
1075                 ofs += local_len;
1076                 buf += local_len;
1077                 len -= local_len;
1078
1079                 if (ofs >> cfi->chipshift) {
1080                         chipnum ++;
1081                         ofs = 0;
1082                         if (chipnum == cfi->numchips)
1083                                 return 0;
1084                 }
1085         }
1086
1087         /* Write buffer is worth it only if more than one word to write... */
1088         while (len >= map_bankwidth(map) * 2) {
1089                 /* We must not cross write block boundaries */
1090                 int size = wbufsize - (ofs & (wbufsize-1));
1091
1092                 if (size > len)
1093                         size = len;
1094                 if (size % map_bankwidth(map))
1095                         size -= size % map_bankwidth(map);
1096
1097                 ret = do_write_buffer(map, &cfi->chips[chipnum],
1098                                       ofs, buf, size);
1099                 if (ret)
1100                         return ret;
1101
1102                 ofs += size;
1103                 buf += size;
1104                 (*retlen) += size;
1105                 len -= size;
1106
1107                 if (ofs >> cfi->chipshift) {
1108                         chipnum ++;
1109                         ofs = 0;
1110                         if (chipnum == cfi->numchips)
1111                                 return 0;
1112                 }
1113         }
1114
1115         if (len) {
1116                 size_t retlen_dregs = 0;
1117
1118                 ret = cfi_amdstd_write_words(mtd, ofs + (chipnum<<cfi->chipshift),
1119                                              len, &retlen_dregs, buf);
1120
1121                 *retlen += retlen_dregs;
1122                 return ret;
1123         }
1124
1125         return 0;
1126 }
1127
1128
1129 /*
1130  * Handle devices with one erase region, that only implement
1131  * the chip erase command.
1132  */
1133 static inline int do_erase_chip(struct map_info *map, struct flchip *chip)
1134 {
1135         struct cfi_private *cfi = map->fldrv_priv;
1136         unsigned long timeo = jiffies + HZ;
1137         unsigned long int adr;
1138         DECLARE_WAITQUEUE(wait, current);
1139         int ret = 0;
1140
1141         adr = cfi->addr_unlock1;
1142
1143         cfi_spin_lock(chip->mutex);
1144         ret = get_chip(map, chip, adr, FL_WRITING);
1145         if (ret) {
1146                 cfi_spin_unlock(chip->mutex);
1147                 return ret;
1148         }
1149
1150         DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): ERASE 0x%.8lx\n",
1151                __func__, chip->start );
1152
1153         ENABLE_VPP(map);
1154         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1155         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
1156         cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1157         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1158         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
1159         cfi_send_gen_cmd(0x10, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1160
1161         chip->state = FL_ERASING;
1162         chip->erase_suspended = 0;
1163         chip->in_progress_block_addr = adr;
1164
1165         cfi_spin_unlock(chip->mutex);
1166         msleep(chip->erase_time/2);
1167         cfi_spin_lock(chip->mutex);
1168
1169         timeo = jiffies + (HZ*20);
1170
1171         for (;;) {
1172                 if (chip->state != FL_ERASING) {
1173                         /* Someone's suspended the erase. Sleep */
1174                         set_current_state(TASK_UNINTERRUPTIBLE);
1175                         add_wait_queue(&chip->wq, &wait);
1176                         cfi_spin_unlock(chip->mutex);
1177                         schedule();
1178                         remove_wait_queue(&chip->wq, &wait);
1179                         cfi_spin_lock(chip->mutex);
1180                         continue;
1181                 }
1182                 if (chip->erase_suspended) {
1183                         /* This erase was suspended and resumed.
1184                            Adjust the timeout */
1185                         timeo = jiffies + (HZ*20); /* FIXME */
1186                         chip->erase_suspended = 0;
1187                 }
1188
1189                 if (chip_ready(map, adr))
1190                         goto op_done;
1191
1192                 if (time_after(jiffies, timeo))
1193                         break;
1194
1195                 /* Latency issues. Drop the lock, wait a while and retry */
1196                 cfi_spin_unlock(chip->mutex);
1197                 set_current_state(TASK_UNINTERRUPTIBLE);
1198                 schedule_timeout(1);
1199                 cfi_spin_lock(chip->mutex);
1200         }
1201
1202         printk(KERN_WARNING "MTD %s(): software timeout\n",
1203                __func__ );
1204
1205         /* reset on all failures. */
1206         map_write( map, CMD(0xF0), chip->start );
1207         /* FIXME - should have reset delay before continuing */
1208
1209         ret = -EIO;
1210  op_done:
1211         chip->state = FL_READY;
1212         put_chip(map, chip, adr);
1213         cfi_spin_unlock(chip->mutex);
1214
1215         return ret;
1216 }
1217
1218
1219 static inline int do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr, int len, void *thunk)
1220 {
1221         struct cfi_private *cfi = map->fldrv_priv;
1222         unsigned long timeo = jiffies + HZ;
1223         DECLARE_WAITQUEUE(wait, current);
1224         int ret = 0;
1225
1226         adr += chip->start;
1227
1228         cfi_spin_lock(chip->mutex);
1229         ret = get_chip(map, chip, adr, FL_ERASING);
1230         if (ret) {
1231                 cfi_spin_unlock(chip->mutex);
1232                 return ret;
1233         }
1234
1235         DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): ERASE 0x%.8lx\n",
1236                __func__, adr );
1237
1238         ENABLE_VPP(map);
1239         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1240         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
1241         cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1242         cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
1243         cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
1244         map_write(map, CMD(0x30), adr);
1245
1246         chip->state = FL_ERASING;
1247         chip->erase_suspended = 0;
1248         chip->in_progress_block_addr = adr;
1249
1250         cfi_spin_unlock(chip->mutex);
1251         msleep(chip->erase_time/2);
1252         cfi_spin_lock(chip->mutex);
1253
1254         timeo = jiffies + (HZ*20);
1255
1256         for (;;) {
1257                 if (chip->state != FL_ERASING) {
1258                         /* Someone's suspended the erase. Sleep */
1259                         set_current_state(TASK_UNINTERRUPTIBLE);
1260                         add_wait_queue(&chip->wq, &wait);
1261                         cfi_spin_unlock(chip->mutex);
1262                         schedule();
1263                         remove_wait_queue(&chip->wq, &wait);
1264                         cfi_spin_lock(chip->mutex);
1265                         continue;
1266                 }
1267                 if (chip->erase_suspended) {
1268                         /* This erase was suspended and resumed.
1269                            Adjust the timeout */
1270                         timeo = jiffies + (HZ*20); /* FIXME */
1271                         chip->erase_suspended = 0;
1272                 }
1273
1274                 if (chip_ready(map, adr))
1275                         goto op_done;
1276
1277                 if (time_after(jiffies, timeo))
1278                         break;
1279
1280                 /* Latency issues. Drop the lock, wait a while and retry */
1281                 cfi_spin_unlock(chip->mutex);
1282                 set_current_state(TASK_UNINTERRUPTIBLE);
1283                 schedule_timeout(1);
1284                 cfi_spin_lock(chip->mutex);
1285         }
1286
1287         printk(KERN_WARNING "MTD %s(): software timeout\n",
1288                __func__ );
1289
1290         /* reset on all failures. */
1291         map_write( map, CMD(0xF0), chip->start );
1292         /* FIXME - should have reset delay before continuing */
1293
1294         ret = -EIO;
1295  op_done:
1296         chip->state = FL_READY;
1297         put_chip(map, chip, adr);
1298         cfi_spin_unlock(chip->mutex);
1299         return ret;
1300 }
1301
1302
1303 int cfi_amdstd_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
1304 {
1305         unsigned long ofs, len;
1306         int ret;
1307
1308         ofs = instr->addr;
1309         len = instr->len;
1310
1311         ret = cfi_varsize_frob(mtd, do_erase_oneblock, ofs, len, NULL);
1312         if (ret)
1313                 return ret;
1314
1315         instr->state = MTD_ERASE_DONE;
1316         mtd_erase_callback(instr);
1317
1318         return 0;
1319 }
1320
1321
1322 static int cfi_amdstd_erase_chip(struct mtd_info *mtd, struct erase_info *instr)
1323 {
1324         struct map_info *map = mtd->priv;
1325         struct cfi_private *cfi = map->fldrv_priv;
1326         int ret = 0;
1327
1328         if (instr->addr != 0)
1329                 return -EINVAL;
1330
1331         if (instr->len != mtd->size)
1332                 return -EINVAL;
1333
1334         ret = do_erase_chip(map, &cfi->chips[0]);
1335         if (ret)
1336                 return ret;
1337
1338         instr->state = MTD_ERASE_DONE;
1339         mtd_erase_callback(instr);
1340
1341         return 0;
1342 }
1343
1344
1345 static void cfi_amdstd_sync (struct mtd_info *mtd)
1346 {
1347         struct map_info *map = mtd->priv;
1348         struct cfi_private *cfi = map->fldrv_priv;
1349         int i;
1350         struct flchip *chip;
1351         int ret = 0;
1352         DECLARE_WAITQUEUE(wait, current);
1353
1354         for (i=0; !ret && i<cfi->numchips; i++) {
1355                 chip = &cfi->chips[i];
1356
1357         retry:
1358                 cfi_spin_lock(chip->mutex);
1359
1360                 switch(chip->state) {
1361                 case FL_READY:
1362                 case FL_STATUS:
1363                 case FL_CFI_QUERY:
1364                 case FL_JEDEC_QUERY:
1365                         chip->oldstate = chip->state;
1366                         chip->state = FL_SYNCING;
1367                         /* No need to wake_up() on this state change -
1368                          * as the whole point is that nobody can do anything
1369                          * with the chip now anyway.
1370                          */
1371                 case FL_SYNCING:
1372                         cfi_spin_unlock(chip->mutex);
1373                         break;
1374
1375                 default:
1376                         /* Not an idle state */
1377                         add_wait_queue(&chip->wq, &wait);
1378
1379                         cfi_spin_unlock(chip->mutex);
1380
1381                         schedule();
1382
1383                         remove_wait_queue(&chip->wq, &wait);
1384
1385                         goto retry;
1386                 }
1387         }
1388
1389         /* Unlock the chips again */
1390
1391         for (i--; i >=0; i--) {
1392                 chip = &cfi->chips[i];
1393
1394                 cfi_spin_lock(chip->mutex);
1395
1396                 if (chip->state == FL_SYNCING) {
1397                         chip->state = chip->oldstate;
1398                         wake_up(&chip->wq);
1399                 }
1400                 cfi_spin_unlock(chip->mutex);
1401         }
1402 }
1403
1404
1405 static int cfi_amdstd_suspend(struct mtd_info *mtd)
1406 {
1407         struct map_info *map = mtd->priv;
1408         struct cfi_private *cfi = map->fldrv_priv;
1409         int i;
1410         struct flchip *chip;
1411         int ret = 0;
1412
1413         for (i=0; !ret && i<cfi->numchips; i++) {
1414                 chip = &cfi->chips[i];
1415
1416                 cfi_spin_lock(chip->mutex);
1417
1418                 switch(chip->state) {
1419                 case FL_READY:
1420                 case FL_STATUS:
1421                 case FL_CFI_QUERY:
1422                 case FL_JEDEC_QUERY:
1423                         chip->oldstate = chip->state;
1424                         chip->state = FL_PM_SUSPENDED;
1425                         /* No need to wake_up() on this state change -
1426                          * as the whole point is that nobody can do anything
1427                          * with the chip now anyway.
1428                          */
1429                 case FL_PM_SUSPENDED:
1430                         break;
1431
1432                 default:
1433                         ret = -EAGAIN;
1434                         break;
1435                 }
1436                 cfi_spin_unlock(chip->mutex);
1437         }
1438
1439         /* Unlock the chips again */
1440
1441         if (ret) {
1442                 for (i--; i >=0; i--) {
1443                         chip = &cfi->chips[i];
1444
1445                         cfi_spin_lock(chip->mutex);
1446
1447                         if (chip->state == FL_PM_SUSPENDED) {
1448                                 chip->state = chip->oldstate;
1449                                 wake_up(&chip->wq);
1450                         }
1451                         cfi_spin_unlock(chip->mutex);
1452                 }
1453         }
1454
1455         return ret;
1456 }
1457
1458
1459 static void cfi_amdstd_resume(struct mtd_info *mtd)
1460 {
1461         struct map_info *map = mtd->priv;
1462         struct cfi_private *cfi = map->fldrv_priv;
1463         int i;
1464         struct flchip *chip;
1465
1466         for (i=0; i<cfi->numchips; i++) {
1467
1468                 chip = &cfi->chips[i];
1469
1470                 cfi_spin_lock(chip->mutex);
1471
1472                 if (chip->state == FL_PM_SUSPENDED) {
1473                         chip->state = FL_READY;
1474                         map_write(map, CMD(0xF0), chip->start);
1475                         wake_up(&chip->wq);
1476                 }
1477                 else
1478                         printk(KERN_ERR "Argh. Chip not in PM_SUSPENDED state upon resume()\n");
1479
1480                 cfi_spin_unlock(chip->mutex);
1481         }
1482 }
1483
1484 static void cfi_amdstd_destroy(struct mtd_info *mtd)
1485 {
1486         struct map_info *map = mtd->priv;
1487         struct cfi_private *cfi = map->fldrv_priv;
1488         kfree(cfi->cmdset_priv);
1489         kfree(cfi->cfiq);
1490         kfree(cfi);
1491         kfree(mtd->eraseregions);
1492 }
1493
1494 static char im_name[]="cfi_cmdset_0002";
1495
1496
1497 static int __init cfi_amdstd_init(void)
1498 {
1499         inter_module_register(im_name, THIS_MODULE, &cfi_cmdset_0002);
1500         return 0;
1501 }
1502
1503
1504 static void __exit cfi_amdstd_exit(void)
1505 {
1506         inter_module_unregister(im_name);
1507 }
1508
1509
1510 module_init(cfi_amdstd_init);
1511 module_exit(cfi_amdstd_exit);
1512
1513 MODULE_LICENSE("GPL");
1514 MODULE_AUTHOR("Crossnet Co. <info@crossnet.co.jp> et al.");
1515 MODULE_DESCRIPTION("MTD chip driver for AMD/Fujitsu flash chips");