drivers/mtd/devices/doc2001.c

   1
   2 /*
   3  * Linux driver for Disk-On-Chip Millennium
   4  * (c) 1999 Machine Vision Holdings, Inc.
   5  * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
   6  *
   7  * $Id: doc2001.c,v 1.49 2005/11/07 11:14:24 gleixner Exp $
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <asm/errno.h>
  13 #include <asm/io.h>
  14 #include <asm/uaccess.h>
  15 #include <linux/miscdevice.h>
  16 #include <linux/delay.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/types.h>
  20 #include <linux/bitops.h>
  21
  22 #include <linux/mtd/mtd.h>
  23 #include <linux/mtd/nand.h>
  24 #include <linux/mtd/doc2000.h>
  25
  26 /* #define ECC_DEBUG */
  27
  28 /* I have no idea why some DoC chips can not use memcop_form|to_io().
  29  * This may be due to the different revisions of the ASIC controller built-in or
  30  * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
  31  * this:*/
  32 #undef USE_MEMCPY
  33
  34 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
  35                     size_t *retlen, u_char *buf);
  36 static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
  37                      size_t *retlen, const u_char *buf);
  38 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
  39                         struct mtd_oob_ops *ops);
  40 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
  41                          struct mtd_oob_ops *ops);
  42 static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
  43
  44 static struct mtd_info *docmillist = NULL;
  45
  46 /* Perform the required delay cycles by reading from the NOP register */
  47 static void DoC_Delay(void __iomem * docptr, unsigned short cycles)
  48 {
  49         volatile char dummy;
  50         int i;
  51
  52         for (i = 0; i < cycles; i++)
  53                 dummy = ReadDOC(docptr, NOP);
  54 }
  55
  56 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
  57 static int _DoC_WaitReady(void __iomem * docptr)
  58 {
  59         unsigned short c = 0xffff;
  60
  61         DEBUG(MTD_DEBUG_LEVEL3,
  62               "_DoC_WaitReady called for out-of-line wait\n");
  63
  64         /* Out-of-line routine to wait for chip response */
  65         while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B) && --c)
  66                 ;
  67
  68         if (c == 0)
  69                 DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
  70
  71         return (c == 0);
  72 }
  73
  74 static inline int DoC_WaitReady(void __iomem * docptr)
  75 {
  76         /* This is inline, to optimise the common case, where it's ready instantly */
  77         int ret = 0;
  78
  79         /* 4 read form NOP register should be issued in prior to the read from CDSNControl
  80            see Software Requirement 11.4 item 2. */
  81         DoC_Delay(docptr, 4);
  82
  83         if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
  84                 /* Call the out-of-line routine to wait */
  85                 ret = _DoC_WaitReady(docptr);
  86
  87         /* issue 2 read from NOP register after reading from CDSNControl register
  88            see Software Requirement 11.4 item 2. */
  89         DoC_Delay(docptr, 2);
  90
  91         return ret;
  92 }
  93
  94 /* DoC_Command: Send a flash command to the flash chip through the CDSN IO register
  95    with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
  96    required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
  97
  98 static void DoC_Command(void __iomem * docptr, unsigned char command,
  99                                unsigned char xtraflags)
 100 {
 101         /* Assert the CLE (Command Latch Enable) line to the flash chip */
 102         WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
 103         DoC_Delay(docptr, 4);
 104
 105         /* Send the command */
 106         WriteDOC(command, docptr, Mil_CDSN_IO);
 107         WriteDOC(0x00, docptr, WritePipeTerm);
 108
 109         /* Lower the CLE line */
 110         WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
 111         DoC_Delay(docptr, 4);
 112 }
 113
 114 /* DoC_Address: Set the current address for the flash chip through the CDSN IO register
 115    with the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
 116    required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
 117
 118 static inline void DoC_Address(void __iomem * docptr, int numbytes, unsigned long ofs,
 119                                unsigned char xtraflags1, unsigned char xtraflags2)
 120 {
 121         /* Assert the ALE (Address Latch Enable) line to the flash chip */
 122         WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
 123         DoC_Delay(docptr, 4);
 124
 125         /* Send the address */
 126         switch (numbytes)
 127             {
 128             case 1:
 129                     /* Send single byte, bits 0-7. */
 130                     WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
 131                     WriteDOC(0x00, docptr, WritePipeTerm);
 132                     break;
 133             case 2:
 134                     /* Send bits 9-16 followed by 17-23 */
 135                     WriteDOC((ofs >> 9)  & 0xff, docptr, Mil_CDSN_IO);
 136                     WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
 137                     WriteDOC(0x00, docptr, WritePipeTerm);
 138                 break;
 139             case 3:
 140                     /* Send 0-7, 9-16, then 17-23 */
 141                     WriteDOC(ofs & 0xff, docptr, Mil_CDSN_IO);
 142                     WriteDOC((ofs >> 9)  & 0xff, docptr, Mil_CDSN_IO);
 143                     WriteDOC((ofs >> 17) & 0xff, docptr, Mil_CDSN_IO);
 144                     WriteDOC(0x00, docptr, WritePipeTerm);
 145                 break;
 146             default:
 147                 return;
 148             }
 149
 150         /* Lower the ALE line */
 151         WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, CDSNControl);
 152         DoC_Delay(docptr, 4);
 153 }
 154
 155 /* DoC_SelectChip: Select a given flash chip within the current floor */
 156 static int DoC_SelectChip(void __iomem * docptr, int chip)
 157 {
 158         /* Select the individual flash chip requested */
 159         WriteDOC(chip, docptr, CDSNDeviceSelect);
 160         DoC_Delay(docptr, 4);
 161
 162         /* Wait for it to be ready */
 163         return DoC_WaitReady(docptr);
 164 }
 165
 166 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
 167 static int DoC_SelectFloor(void __iomem * docptr, int floor)
 168 {
 169         /* Select the floor (bank) of chips required */
 170         WriteDOC(floor, docptr, FloorSelect);
 171
 172         /* Wait for the chip to be ready */
 173         return DoC_WaitReady(docptr);
 174 }
 175
 176 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
 177 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
 178 {
 179         int mfr, id, i, j;
 180         volatile char dummy;
 181
 182         /* Page in the required floor/chip
 183            FIXME: is this supported by Millennium ?? */
 184         DoC_SelectFloor(doc->virtadr, floor);
 185         DoC_SelectChip(doc->virtadr, chip);
 186
 187         /* Reset the chip, see Software Requirement 11.4 item 1. */
 188         DoC_Command(doc->virtadr, NAND_CMD_RESET, CDSN_CTRL_WP);
 189         DoC_WaitReady(doc->virtadr);
 190
 191         /* Read the NAND chip ID: 1. Send ReadID command */
 192         DoC_Command(doc->virtadr, NAND_CMD_READID, CDSN_CTRL_WP);
 193
 194         /* Read the NAND chip ID: 2. Send address byte zero */
 195         DoC_Address(doc->virtadr, 1, 0x00, CDSN_CTRL_WP, 0x00);
 196
 197         /* Read the manufacturer and device id codes of the flash device through
 198            CDSN IO register see Software Requirement 11.4 item 5.*/
 199         dummy = ReadDOC(doc->virtadr, ReadPipeInit);
 200         DoC_Delay(doc->virtadr, 2);
 201         mfr = ReadDOC(doc->virtadr, Mil_CDSN_IO);
 202
 203         DoC_Delay(doc->virtadr, 2);
 204         id  = ReadDOC(doc->virtadr, Mil_CDSN_IO);
 205         dummy = ReadDOC(doc->virtadr, LastDataRead);
 206
 207         /* No response - return failure */
 208         if (mfr == 0xff || mfr == 0)
 209                 return 0;
 210
 211         /* FIXME: to deal with multi-flash on multi-Millennium case more carefully */
 212         for (i = 0; nand_flash_ids[i].name != NULL; i++) {
 213                 if ( id == nand_flash_ids[i].id) {
 214                         /* Try to identify manufacturer */
 215                         for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
 216                                 if (nand_manuf_ids[j].id == mfr)
 217                                         break;
 218                         }
 219                         printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
 220                                "Chip ID: %2.2X (%s:%s)\n",
 221                                mfr, id, nand_manuf_ids[j].name, nand_flash_ids[i].name);
 222                         doc->mfr = mfr;
 223                         doc->id = id;
 224                         doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
 225                         break;
 226                 }
 227         }
 228
 229         if (nand_flash_ids[i].name == NULL)
 230                 return 0;
 231         else
 232                 return 1;
 233 }
 234
 235 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
 236 static void DoC_ScanChips(struct DiskOnChip *this)
 237 {
 238         int floor, chip;
 239         int numchips[MAX_FLOORS_MIL];
 240         int ret;
 241
 242         this->numchips = 0;
 243         this->mfr = 0;
 244         this->id = 0;
 245
 246         /* For each floor, find the number of valid chips it contains */
 247         for (floor = 0,ret = 1; floor < MAX_FLOORS_MIL; floor++) {
 248                 numchips[floor] = 0;
 249                 for (chip = 0; chip < MAX_CHIPS_MIL && ret != 0; chip++) {
 250                         ret = DoC_IdentChip(this, floor, chip);
 251                         if (ret) {
 252                                 numchips[floor]++;
 253                                 this->numchips++;
 254                         }
 255                 }
 256         }
 257         /* If there are none at all that we recognise, bail */
 258         if (!this->numchips) {
 259                 printk("No flash chips recognised.\n");
 260                 return;
 261         }
 262
 263         /* Allocate an array to hold the information for each chip */
 264         this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
 265         if (!this->chips){
 266                 printk("No memory for allocating chip info structures\n");
 267                 return;
 268         }
 269
 270         /* Fill out the chip array with {floor, chipno} for each
 271          * detected chip in the device. */
 272         for (floor = 0, ret = 0; floor < MAX_FLOORS_MIL; floor++) {
 273                 for (chip = 0 ; chip < numchips[floor] ; chip++) {
 274                         this->chips[ret].floor = floor;
 275                         this->chips[ret].chip = chip;
 276                         this->chips[ret].curadr = 0;
 277                         this->chips[ret].curmode = 0x50;
 278                         ret++;
 279                 }
 280         }
 281
 282         /* Calculate and print the total size of the device */
 283         this->totlen = this->numchips * (1 << this->chipshift);
 284         printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
 285                this->numchips ,this->totlen >> 20);
 286 }
 287
 288 static int DoCMil_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
 289 {
 290         int tmp1, tmp2, retval;
 291
 292         if (doc1->physadr == doc2->physadr)
 293                 return 1;
 294
 295         /* Use the alias resolution register which was set aside for this
 296          * purpose. If it's value is the same on both chips, they might
 297          * be the same chip, and we write to one and check for a change in
 298          * the other. It's unclear if this register is usuable in the
 299          * DoC 2000 (it's in the Millenium docs), but it seems to work. */
 300         tmp1 = ReadDOC(doc1->virtadr, AliasResolution);
 301         tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
 302         if (tmp1 != tmp2)
 303                 return 0;
 304
 305         WriteDOC((tmp1+1) % 0xff, doc1->virtadr, AliasResolution);
 306         tmp2 = ReadDOC(doc2->virtadr, AliasResolution);
 307         if (tmp2 == (tmp1+1) % 0xff)
 308                 retval = 1;
 309         else
 310                 retval = 0;
 311
 312         /* Restore register contents.  May not be necessary, but do it just to
 313          * be safe. */
 314         WriteDOC(tmp1, doc1->virtadr, AliasResolution);
 315
 316         return retval;
 317 }
 318
 319 /* This routine is found from the docprobe code by symbol_get(),
 320  * which will bump the use count of this module. */
 321 void DoCMil_init(struct mtd_info *mtd)
 322 {
 323         struct DiskOnChip *this = mtd->priv;
 324         struct DiskOnChip *old = NULL;
 325
 326         /* We must avoid being called twice for the same device. */
 327         if (docmillist)
 328                 old = docmillist->priv;
 329
 330         while (old) {
 331                 if (DoCMil_is_alias(this, old)) {
 332                         printk(KERN_NOTICE "Ignoring DiskOnChip Millennium at "
 333                                "0x%lX - already configured\n", this->physadr);
 334                         iounmap(this->virtadr);
 335                         kfree(mtd);
 336                         return;
 337                 }
 338                 if (old->nextdoc)
 339                         old = old->nextdoc->priv;
 340                 else
 341                         old = NULL;
 342         }
 343
 344         mtd->name = "DiskOnChip Millennium";
 345         printk(KERN_NOTICE "DiskOnChip Millennium found at address 0x%lX\n",
 346                this->physadr);
 347
 348         mtd->type = MTD_NANDFLASH;
 349         mtd->flags = MTD_CAP_NANDFLASH;
 350         mtd->size = 0;
 351
 352         /* FIXME: erase size is not always 8KiB */
 353         mtd->erasesize = 0x2000;
 354
 355         mtd->writesize = 512;
 356         mtd->oobsize = 16;
 357         mtd->owner = THIS_MODULE;
 358         mtd->erase = doc_erase;
 359         mtd->point = NULL;
 360         mtd->unpoint = NULL;
 361         mtd->read = doc_read;
 362         mtd->write = doc_write;
 363         mtd->read_oob = doc_read_oob;
 364         mtd->write_oob = doc_write_oob;
 365         mtd->sync = NULL;
 366
 367         this->totlen = 0;
 368         this->numchips = 0;
 369         this->curfloor = -1;
 370         this->curchip = -1;
 371
 372         /* Ident all the chips present. */
 373         DoC_ScanChips(this);
 374
 375         if (!this->totlen) {
 376                 kfree(mtd);
 377                 iounmap(this->virtadr);
 378         } else {
 379                 this->nextdoc = docmillist;
 380                 docmillist = mtd;
 381                 mtd->size  = this->totlen;
 382                 add_mtd_device(mtd);
 383                 return;
 384         }
 385 }
 386 EXPORT_SYMBOL_GPL(DoCMil_init);
 387
 388 static int doc_read (struct mtd_info *mtd, loff_t from, size_t len,
 389                      size_t *retlen, u_char *buf)
 390 {
 391         int i, ret;
 392         volatile char dummy;
 393         unsigned char syndrome[6], eccbuf[6];
 394         struct DiskOnChip *this = mtd->priv;
 395         void __iomem *docptr = this->virtadr;
 396         struct Nand *mychip = &this->chips[from >> (this->chipshift)];
 397
 398         /* Don't allow read past end of device */
 399         if (from >= this->totlen)
 400                 return -EINVAL;
 401
 402         /* Don't allow a single read to cross a 512-byte block boundary */
 403         if (from + len > ((from | 0x1ff) + 1))
 404                 len = ((from | 0x1ff) + 1) - from;
 405
 406         /* Find the chip which is to be used and select it */
 407         if (this->curfloor != mychip->floor) {
 408                 DoC_SelectFloor(docptr, mychip->floor);
 409                 DoC_SelectChip(docptr, mychip->chip);
 410         } else if (this->curchip != mychip->chip) {
 411                 DoC_SelectChip(docptr, mychip->chip);
 412         }
 413         this->curfloor = mychip->floor;
 414         this->curchip = mychip->chip;
 415
 416         /* issue the Read0 or Read1 command depend on which half of the page
 417            we are accessing. Polling the Flash Ready bit after issue 3 bytes
 418            address in Sequence Read Mode, see Software Requirement 11.4 item 1.*/
 419         DoC_Command(docptr, (from >> 8) & 1, CDSN_CTRL_WP);
 420         DoC_Address(docptr, 3, from, CDSN_CTRL_WP, 0x00);
 421         DoC_WaitReady(docptr);
 422
 423         /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
 424         WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
 425         WriteDOC (DOC_ECC_EN, docptr, ECCConf);
 426
 427         /* Read the data via the internal pipeline through CDSN IO register,
 428            see Pipelined Read Operations 11.3 */
 429         dummy = ReadDOC(docptr, ReadPipeInit);
 430 #ifndef USE_MEMCPY
 431         for (i = 0; i < len-1; i++) {
 432                 /* N.B. you have to increase the source address in this way or the
 433                    ECC logic will not work properly */
 434                 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
 435         }
 436 #else
 437         memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
 438 #endif
 439         buf[len - 1] = ReadDOC(docptr, LastDataRead);
 440
 441         /* Let the caller know we completed it */
 442         *retlen = len;
 443         ret = 0;
 444
 445         /* Read the ECC data from Spare Data Area,
 446            see Reed-Solomon EDC/ECC 11.1 */
 447         dummy = ReadDOC(docptr, ReadPipeInit);
 448 #ifndef USE_MEMCPY
 449         for (i = 0; i < 5; i++) {
 450                 /* N.B. you have to increase the source address in this way or the
 451                    ECC logic will not work properly */
 452                 eccbuf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
 453         }
 454 #else
 455         memcpy_fromio(eccbuf, docptr + DoC_Mil_CDSN_IO, 5);
 456 #endif
 457         eccbuf[5] = ReadDOC(docptr, LastDataRead);
 458
 459         /* Flush the pipeline */
 460         dummy = ReadDOC(docptr, ECCConf);
 461         dummy = ReadDOC(docptr, ECCConf);
 462
 463         /* Check the ECC Status */
 464         if (ReadDOC(docptr, ECCConf) & 0x80) {
 465                 int nb_errors;
 466                 /* There was an ECC error */
 467 #ifdef ECC_DEBUG
 468                 printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
 469 #endif
 470                 /* Read the ECC syndrom through the DiskOnChip ECC logic.
 471                    These syndrome will be all ZERO when there is no error */
 472                 for (i = 0; i < 6; i++) {
 473                         syndrome[i] = ReadDOC(docptr, ECCSyndrome0 + i);
 474                 }
 475                 nb_errors = doc_decode_ecc(buf, syndrome);
 476 #ifdef ECC_DEBUG
 477                 printk("ECC Errors corrected: %x\n", nb_errors);
 478 #endif
 479                 if (nb_errors < 0) {
 480                         /* We return error, but have actually done the read. Not that
 481                            this can be told to user-space, via sys_read(), but at least
 482                            MTD-aware stuff can know about it by checking *retlen */
 483                         ret = -EIO;
 484                 }
 485         }
 486
 487 #ifdef PSYCHO_DEBUG
 488         printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
 489                (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
 490                eccbuf[4], eccbuf[5]);
 491 #endif
 492
 493         /* disable the ECC engine */
 494         WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
 495
 496         return ret;
 497 }
 498
 499 static int doc_write (struct mtd_info *mtd, loff_t to, size_t len,
 500                       size_t *retlen, const u_char *buf)
 501 {
 502         int i,ret = 0;
 503         char eccbuf[6];
 504         volatile char dummy;
 505         struct DiskOnChip *this = mtd->priv;
 506         void __iomem *docptr = this->virtadr;
 507         struct Nand *mychip = &this->chips[to >> (this->chipshift)];
 508
 509         /* Don't allow write past end of device */
 510         if (to >= this->totlen)
 511                 return -EINVAL;
 512
 513 #if 0
 514         /* Don't allow a single write to cross a 512-byte block boundary */
 515         if (to + len > ( (to | 0x1ff) + 1))
 516                 len = ((to | 0x1ff) + 1) - to;
 517 #else
 518         /* Don't allow writes which aren't exactly one block */
 519         if (to & 0x1ff || len != 0x200)
 520                 return -EINVAL;
 521 #endif
 522
 523         /* Find the chip which is to be used and select it */
 524         if (this->curfloor != mychip->floor) {
 525                 DoC_SelectFloor(docptr, mychip->floor);
 526                 DoC_SelectChip(docptr, mychip->chip);
 527         } else if (this->curchip != mychip->chip) {
 528                 DoC_SelectChip(docptr, mychip->chip);
 529         }
 530         this->curfloor = mychip->floor;
 531         this->curchip = mychip->chip;
 532
 533         /* Reset the chip, see Software Requirement 11.4 item 1. */
 534         DoC_Command(docptr, NAND_CMD_RESET, 0x00);
 535         DoC_WaitReady(docptr);
 536         /* Set device to main plane of flash */
 537         DoC_Command(docptr, NAND_CMD_READ0, 0x00);
 538
 539         /* issue the Serial Data In command to initial the Page Program process */
 540         DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
 541         DoC_Address(docptr, 3, to, 0x00, 0x00);
 542         DoC_WaitReady(docptr);
 543
 544         /* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
 545         WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
 546         WriteDOC (DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
 547
 548         /* Write the data via the internal pipeline through CDSN IO register,
 549            see Pipelined Write Operations 11.2 */
 550 #ifndef USE_MEMCPY
 551         for (i = 0; i < len; i++) {
 552                 /* N.B. you have to increase the source address in this way or the
 553                    ECC logic will not work properly */
 554                 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
 555         }
 556 #else
 557         memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
 558 #endif
 559         WriteDOC(0x00, docptr, WritePipeTerm);
 560
 561         /* Write ECC data to flash, the ECC info is generated by the DiskOnChip ECC logic
 562            see Reed-Solomon EDC/ECC 11.1 */
 563         WriteDOC(0, docptr, NOP);
 564         WriteDOC(0, docptr, NOP);
 565         WriteDOC(0, docptr, NOP);
 566
 567         /* Read the ECC data through the DiskOnChip ECC logic */
 568         for (i = 0; i < 6; i++) {
 569                 eccbuf[i] = ReadDOC(docptr, ECCSyndrome0 + i);
 570         }
 571
 572         /* ignore the ECC engine */
 573         WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
 574
 575 #ifndef USE_MEMCPY
 576         /* Write the ECC data to flash */
 577         for (i = 0; i < 6; i++) {
 578                 /* N.B. you have to increase the source address in this way or the
 579                    ECC logic will not work properly */
 580                 WriteDOC(eccbuf[i], docptr, Mil_CDSN_IO + i);
 581         }
 582 #else
 583         memcpy_toio(docptr + DoC_Mil_CDSN_IO, eccbuf, 6);
 584 #endif
 585
 586         /* write the block status BLOCK_USED (0x5555) at the end of ECC data
 587            FIXME: this is only a hack for programming the IPL area for LinuxBIOS
 588            and should be replace with proper codes in user space utilities */
 589         WriteDOC(0x55, docptr, Mil_CDSN_IO);
 590         WriteDOC(0x55, docptr, Mil_CDSN_IO + 1);
 591
 592         WriteDOC(0x00, docptr, WritePipeTerm);
 593
 594 #ifdef PSYCHO_DEBUG
 595         printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
 596                (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
 597                eccbuf[4], eccbuf[5]);
 598 #endif
 599
 600         /* Commit the Page Program command and wait for ready
 601            see Software Requirement 11.4 item 1.*/
 602         DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
 603         DoC_WaitReady(docptr);
 604
 605         /* Read the status of the flash device through CDSN IO register
 606            see Software Requirement 11.4 item 5.*/
 607         DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
 608         dummy = ReadDOC(docptr, ReadPipeInit);
 609         DoC_Delay(docptr, 2);
 610         if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
 611                 printk("Error programming flash\n");
 612                 /* Error in programming
 613                    FIXME: implement Bad Block Replacement (in nftl.c ??) */
 614                 *retlen = 0;
 615                 ret = -EIO;
 616         }
 617         dummy = ReadDOC(docptr, LastDataRead);
 618
 619         /* Let the caller know we completed it */
 620         *retlen = len;
 621
 622         return ret;
 623 }
 624
 625 static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
 626                         struct mtd_oob_ops *ops)
 627 {
 628 #ifndef USE_MEMCPY
 629         int i;
 630 #endif
 631         volatile char dummy;
 632         struct DiskOnChip *this = mtd->priv;
 633         void __iomem *docptr = this->virtadr;
 634         struct Nand *mychip = &this->chips[ofs >> this->chipshift];
 635         uint8_t *buf = ops->oobbuf;
 636         size_t len = ops->len;
 637
 638         BUG_ON(ops->mode != MTD_OOB_PLACE);
 639
 640         ofs += ops->ooboffs;
 641
 642         /* Find the chip which is to be used and select it */
 643         if (this->curfloor != mychip->floor) {
 644                 DoC_SelectFloor(docptr, mychip->floor);
 645                 DoC_SelectChip(docptr, mychip->chip);
 646         } else if (this->curchip != mychip->chip) {
 647                 DoC_SelectChip(docptr, mychip->chip);
 648         }
 649         this->curfloor = mychip->floor;
 650         this->curchip = mychip->chip;
 651
 652         /* disable the ECC engine */
 653         WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
 654         WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
 655
 656         /* issue the Read2 command to set the pointer to the Spare Data Area.
 657            Polling the Flash Ready bit after issue 3 bytes address in
 658            Sequence Read Mode, see Software Requirement 11.4 item 1.*/
 659         DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
 660         DoC_Address(docptr, 3, ofs, CDSN_CTRL_WP, 0x00);
 661         DoC_WaitReady(docptr);
 662
 663         /* Read the data out via the internal pipeline through CDSN IO register,
 664            see Pipelined Read Operations 11.3 */
 665         dummy = ReadDOC(docptr, ReadPipeInit);
 666 #ifndef USE_MEMCPY
 667         for (i = 0; i < len-1; i++) {
 668                 /* N.B. you have to increase the source address in this way or the
 669                    ECC logic will not work properly */
 670                 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
 671         }
 672 #else
 673         memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len - 1);
 674 #endif
 675         buf[len - 1] = ReadDOC(docptr, LastDataRead);
 676
 677         ops->retlen = len;
 678
 679         return 0;
 680 }
 681
 682 static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
 683                          struct mtd_oob_ops *ops)
 684 {
 685 #ifndef USE_MEMCPY
 686         int i;
 687 #endif
 688         volatile char dummy;
 689         int ret = 0;
 690         struct DiskOnChip *this = mtd->priv;
 691         void __iomem *docptr = this->virtadr;
 692         struct Nand *mychip = &this->chips[ofs >> this->chipshift];
 693         uint8_t *buf = ops->oobbuf;
 694         size_t len = ops->len;
 695
 696         BUG_ON(ops->mode != MTD_OOB_PLACE);
 697
 698         ofs += ops->ooboffs;
 699
 700         /* Find the chip which is to be used and select it */
 701         if (this->curfloor != mychip->floor) {
 702                 DoC_SelectFloor(docptr, mychip->floor);
 703                 DoC_SelectChip(docptr, mychip->chip);
 704         } else if (this->curchip != mychip->chip) {
 705                 DoC_SelectChip(docptr, mychip->chip);
 706         }
 707         this->curfloor = mychip->floor;
 708         this->curchip = mychip->chip;
 709
 710         /* disable the ECC engine */
 711         WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
 712         WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
 713
 714         /* Reset the chip, see Software Requirement 11.4 item 1. */
 715         DoC_Command(docptr, NAND_CMD_RESET, CDSN_CTRL_WP);
 716         DoC_WaitReady(docptr);
 717         /* issue the Read2 command to set the pointer to the Spare Data Area. */
 718         DoC_Command(docptr, NAND_CMD_READOOB, CDSN_CTRL_WP);
 719
 720         /* issue the Serial Data In command to initial the Page Program process */
 721         DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
 722         DoC_Address(docptr, 3, ofs, 0x00, 0x00);
 723
 724         /* Write the data via the internal pipeline through CDSN IO register,
 725            see Pipelined Write Operations 11.2 */
 726 #ifndef USE_MEMCPY
 727         for (i = 0; i < len; i++) {
 728                 /* N.B. you have to increase the source address in this way or the
 729                    ECC logic will not work properly */
 730                 WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
 731         }
 732 #else
 733         memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
 734 #endif
 735         WriteDOC(0x00, docptr, WritePipeTerm);
 736
 737         /* Commit the Page Program command and wait for ready
 738            see Software Requirement 11.4 item 1.*/
 739         DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
 740         DoC_WaitReady(docptr);
 741
 742         /* Read the status of the flash device through CDSN IO register
 743            see Software Requirement 11.4 item 5.*/
 744         DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
 745         dummy = ReadDOC(docptr, ReadPipeInit);
 746         DoC_Delay(docptr, 2);
 747         if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
 748                 printk("Error programming oob data\n");
 749                 /* FIXME: implement Bad Block Replacement (in nftl.c ??) */
 750                 ops->retlen = 0;
 751                 ret = -EIO;
 752         }
 753         dummy = ReadDOC(docptr, LastDataRead);
 754
 755         ops->retlen = len;
 756
 757         return ret;
 758 }
 759
 760 int doc_erase (struct mtd_info *mtd, struct erase_info *instr)
 761 {
 762         volatile char dummy;
 763         struct DiskOnChip *this = mtd->priv;
 764         __u32 ofs = instr->addr;
 765         __u32 len = instr->len;
 766         void __iomem *docptr = this->virtadr;
 767         struct Nand *mychip = &this->chips[ofs >> this->chipshift];
 768
 769         if (len != mtd->erasesize)
 770                 printk(KERN_WARNING "Erase not right size (%x != %x)n",
 771                        len, mtd->erasesize);
 772
 773         /* Find the chip which is to be used and select it */
 774         if (this->curfloor != mychip->floor) {
 775                 DoC_SelectFloor(docptr, mychip->floor);
 776                 DoC_SelectChip(docptr, mychip->chip);
 777         } else if (this->curchip != mychip->chip) {
 778                 DoC_SelectChip(docptr, mychip->chip);
 779         }
 780         this->curfloor = mychip->floor;
 781         this->curchip = mychip->chip;
 782
 783         instr->state = MTD_ERASE_PENDING;
 784
 785         /* issue the Erase Setup command */
 786         DoC_Command(docptr, NAND_CMD_ERASE1, 0x00);
 787         DoC_Address(docptr, 2, ofs, 0x00, 0x00);
 788
 789         /* Commit the Erase Start command and wait for ready
 790            see Software Requirement 11.4 item 1.*/
 791         DoC_Command(docptr, NAND_CMD_ERASE2, 0x00);
 792         DoC_WaitReady(docptr);
 793
 794         instr->state = MTD_ERASING;
 795
 796         /* Read the status of the flash device through CDSN IO register
 797            see Software Requirement 11.4 item 5.
 798            FIXME: it seems that we are not wait long enough, some blocks are not
 799            erased fully */
 800         DoC_Command(docptr, NAND_CMD_STATUS, CDSN_CTRL_WP);
 801         dummy = ReadDOC(docptr, ReadPipeInit);
 802         DoC_Delay(docptr, 2);
 803         if (ReadDOC(docptr, Mil_CDSN_IO) & 1) {
 804                 printk("Error Erasing at 0x%x\n", ofs);
 805                 /* There was an error
 806                    FIXME: implement Bad Block Replacement (in nftl.c ??) */
 807                 instr->state = MTD_ERASE_FAILED;
 808         } else
 809                 instr->state = MTD_ERASE_DONE;
 810         dummy = ReadDOC(docptr, LastDataRead);
 811
 812         mtd_erase_callback(instr);
 813
 814         return 0;
 815 }
 816
 817 /****************************************************************************
 818  *
 819  * Module stuff
 820  *
 821  ****************************************************************************/
 822
 823 static void __exit cleanup_doc2001(void)
 824 {
 825         struct mtd_info *mtd;
 826         struct DiskOnChip *this;
 827
 828         while ((mtd=docmillist)) {
 829                 this = mtd->priv;
 830                 docmillist = this->nextdoc;
 831
 832                 del_mtd_device(mtd);
 833
 834                 iounmap(this->virtadr);
 835                 kfree(this->chips);
 836                 kfree(mtd);
 837         }
 838 }
 839
 840 module_exit(cleanup_doc2001);
 841
 842 MODULE_LICENSE("GPL");
 843 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
 844 MODULE_DESCRIPTION("Alternative driver for DiskOnChip Millennium");