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