git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/nand/cafe_nand.c

   1 /*
   2  * Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
   3  *
   4  * Copyright © 2006 Red Hat, Inc.
   5  * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
   6  */
   7
   8 #define DEBUG
   9
  10 #include <linux/device.h>
  11 #undef DEBUG
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/mtd/nand.h>
  14 #include <linux/mtd/partitions.h>
  15 #include <linux/rslib.h>
  16 #include <linux/pci.h>
  17 #include <linux/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/dma-mapping.h>
  20 #include <asm/io.h>
  21
  22 #define CAFE_NAND_CTRL1         0x00
  23 #define CAFE_NAND_CTRL2         0x04
  24 #define CAFE_NAND_CTRL3         0x08
  25 #define CAFE_NAND_STATUS        0x0c
  26 #define CAFE_NAND_IRQ           0x10
  27 #define CAFE_NAND_IRQ_MASK      0x14
  28 #define CAFE_NAND_DATA_LEN      0x18
  29 #define CAFE_NAND_ADDR1         0x1c
  30 #define CAFE_NAND_ADDR2         0x20
  31 #define CAFE_NAND_TIMING1       0x24
  32 #define CAFE_NAND_TIMING2       0x28
  33 #define CAFE_NAND_TIMING3       0x2c
  34 #define CAFE_NAND_NONMEM        0x30
  35 #define CAFE_NAND_ECC_RESULT    0x3C
  36 #define CAFE_NAND_DMA_CTRL      0x40
  37 #define CAFE_NAND_DMA_ADDR0     0x44
  38 #define CAFE_NAND_DMA_ADDR1     0x48
  39 #define CAFE_NAND_ECC_SYN01     0x50
  40 #define CAFE_NAND_ECC_SYN23     0x54
  41 #define CAFE_NAND_ECC_SYN45     0x58
  42 #define CAFE_NAND_ECC_SYN67     0x5c
  43 #define CAFE_NAND_READ_DATA     0x1000
  44 #define CAFE_NAND_WRITE_DATA    0x2000
  45
  46 #define CAFE_GLOBAL_CTRL        0x3004
  47 #define CAFE_GLOBAL_IRQ         0x3008
  48 #define CAFE_GLOBAL_IRQ_MASK    0x300c
  49 #define CAFE_NAND_RESET         0x3034
  50
  51 /* Missing from the datasheet: bit 19 of CTRL1 sets CE0 vs. CE1 */
  52 #define CTRL1_CHIPSELECT        (1<<19)
  53
  54 struct cafe_priv {
  55         struct nand_chip nand;
  56         struct mtd_partition *parts;
  57         struct pci_dev *pdev;
  58         void __iomem *mmio;
  59         struct rs_control *rs;
  60         uint32_t ctl1;
  61         uint32_t ctl2;
  62         int datalen;
  63         int nr_data;
  64         int data_pos;
  65         int page_addr;
  66         dma_addr_t dmaaddr;
  67         unsigned char *dmabuf;
  68 };
  69
  70 static int usedma = 1;
  71 module_param(usedma, int, 0644);
  72
  73 static int skipbbt = 0;
  74 module_param(skipbbt, int, 0644);
  75
  76 static int debug = 0;
  77 module_param(debug, int, 0644);
  78
  79 static int regdebug = 0;
  80 module_param(regdebug, int, 0644);
  81
  82 static int checkecc = 1;
  83 module_param(checkecc, int, 0644);
  84
  85 static unsigned int numtimings;
  86 static int timing[3];
  87 module_param_array(timing, int, &numtimings, 0644);
  88
  89 #ifdef CONFIG_MTD_PARTITIONS
  90 static const char *part_probes[] = { "RedBoot", NULL };
  91 #endif
  92
  93 /* Hrm. Why isn't this already conditional on something in the struct device? */
  94 #define cafe_dev_dbg(dev, args...) do { if (debug) dev_dbg(dev, ##args); } while(0)
  95
  96 /* Make it easier to switch to PIO if we need to */
  97 #define cafe_readl(cafe, addr)                  readl((cafe)->mmio + CAFE_##addr)
  98 #define cafe_writel(cafe, datum, addr)          writel(datum, (cafe)->mmio + CAFE_##addr)
  99
 100 static int cafe_device_ready(struct mtd_info *mtd)
 101 {
 102         struct cafe_priv *cafe = mtd->priv;
 103         int result = !!(cafe_readl(cafe, NAND_STATUS) | 0x40000000);
 104         uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
 105
 106         cafe_writel(cafe, irqs, NAND_IRQ);
 107
 108         cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
 109                 result?"":" not", irqs, cafe_readl(cafe, NAND_IRQ),
 110                 cafe_readl(cafe, GLOBAL_IRQ), cafe_readl(cafe, GLOBAL_IRQ_MASK));
 111
 112         return result;
 113 }
 114
 115
 116 static void cafe_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 117 {
 118         struct cafe_priv *cafe = mtd->priv;
 119
 120         if (usedma)
 121                 memcpy(cafe->dmabuf + cafe->datalen, buf, len);
 122         else
 123                 memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
 124
 125         cafe->datalen += len;
 126
 127         cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
 128                 len, cafe->datalen);
 129 }
 130
 131 static void cafe_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 132 {
 133         struct cafe_priv *cafe = mtd->priv;
 134
 135         if (usedma)
 136                 memcpy(buf, cafe->dmabuf + cafe->datalen, len);
 137         else
 138                 memcpy_fromio(buf, cafe->mmio + CAFE_NAND_READ_DATA + cafe->datalen, len);
 139
 140         cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes from position 0x%x in read buffer.\n",
 141                   len, cafe->datalen);
 142         cafe->datalen += len;
 143 }
 144
 145 static uint8_t cafe_read_byte(struct mtd_info *mtd)
 146 {
 147         struct cafe_priv *cafe = mtd->priv;
 148         uint8_t d;
 149
 150         cafe_read_buf(mtd, &d, 1);
 151         cafe_dev_dbg(&cafe->pdev->dev, "Read %02x\n", d);
 152
 153         return d;
 154 }
 155
 156 static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
 157                               int column, int page_addr)
 158 {
 159         struct cafe_priv *cafe = mtd->priv;
 160         int adrbytes = 0;
 161         uint32_t ctl1;
 162         uint32_t doneint = 0x80000000;
 163
 164         cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
 165                 command, column, page_addr);
 166
 167         if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
 168                 /* Second half of a command we already calculated */
 169                 cafe_writel(cafe, cafe->ctl2 | 0x100 | command, NAND_CTRL2);
 170                 ctl1 = cafe->ctl1;
 171                 cafe->ctl2 &= ~(1<<30);
 172                 cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
 173                           cafe->ctl1, cafe->nr_data);
 174                 goto do_command;
 175         }
 176         /* Reset ECC engine */
 177         cafe_writel(cafe, 0, NAND_CTRL2);
 178
 179         /* Emulate NAND_CMD_READOOB on large-page chips */
 180         if (mtd->writesize > 512 &&
 181             command == NAND_CMD_READOOB) {
 182                 column += mtd->writesize;
 183                 command = NAND_CMD_READ0;
 184         }
 185
 186         /* FIXME: Do we need to send read command before sending data
 187            for small-page chips, to position the buffer correctly? */
 188
 189         if (column != -1) {
 190                 cafe_writel(cafe, column, NAND_ADDR1);
 191                 adrbytes = 2;
 192                 if (page_addr != -1)
 193                         goto write_adr2;
 194         } else if (page_addr != -1) {
 195                 cafe_writel(cafe, page_addr & 0xffff, NAND_ADDR1);
 196                 page_addr >>= 16;
 197         write_adr2:
 198                 cafe_writel(cafe, page_addr, NAND_ADDR2);
 199                 adrbytes += 2;
 200                 if (mtd->size > mtd->writesize << 16)
 201                         adrbytes++;
 202         }
 203
 204         cafe->data_pos = cafe->datalen = 0;
 205
 206         /* Set command valid bit, mask in the chip select bit  */
 207         ctl1 = 0x80000000 | command | (cafe->ctl1 & CTRL1_CHIPSELECT);
 208
 209         /* Set RD or WR bits as appropriate */
 210         if (command == NAND_CMD_READID || command == NAND_CMD_STATUS) {
 211                 ctl1 |= (1<<26); /* rd */
 212                 /* Always 5 bytes, for now */
 213                 cafe->datalen = 4;
 214                 /* And one address cycle -- even for STATUS, since the controller doesn't work without */
 215                 adrbytes = 1;
 216         } else if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
 217                    command == NAND_CMD_READOOB || command == NAND_CMD_RNDOUT) {
 218                 ctl1 |= 1<<26; /* rd */
 219                 /* For now, assume just read to end of page */
 220                 cafe->datalen = mtd->writesize + mtd->oobsize - column;
 221         } else if (command == NAND_CMD_SEQIN)
 222                 ctl1 |= 1<<25; /* wr */
 223
 224         /* Set number of address bytes */
 225         if (adrbytes)
 226                 ctl1 |= ((adrbytes-1)|8) << 27;
 227
 228         if (command == NAND_CMD_SEQIN || command == NAND_CMD_ERASE1) {
 229                 /* Ignore the first command of a pair; the hardware
 230                    deals with them both at once, later */
 231                 cafe->ctl1 = ctl1;
 232                 cafe_dev_dbg(&cafe->pdev->dev, "Setup for delayed command, ctl1 %08x, dlen %x\n",
 233                           cafe->ctl1, cafe->datalen);
 234                 return;
 235         }
 236         /* RNDOUT and READ0 commands need a following byte */
 237         if (command == NAND_CMD_RNDOUT)
 238                 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_RNDOUTSTART, NAND_CTRL2);
 239         else if (command == NAND_CMD_READ0 && mtd->writesize > 512)
 240                 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_READSTART, NAND_CTRL2);
 241
 242  do_command:
 243         cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
 244                 cafe->datalen, ctl1, cafe_readl(cafe, NAND_CTRL2));
 245
 246         /* NB: The datasheet lies -- we really should be subtracting 1 here */
 247         cafe_writel(cafe, cafe->datalen, NAND_DATA_LEN);
 248         cafe_writel(cafe, 0x90000000, NAND_IRQ);
 249         if (usedma && (ctl1 & (3<<25))) {
 250                 uint32_t dmactl = 0xc0000000 + cafe->datalen;
 251                 /* If WR or RD bits set, set up DMA */
 252                 if (ctl1 & (1<<26)) {
 253                         /* It's a read */
 254                         dmactl |= (1<<29);
 255                         /* ... so it's done when the DMA is done, not just
 256                            the command. */
 257                         doneint = 0x10000000;
 258                 }
 259                 cafe_writel(cafe, dmactl, NAND_DMA_CTRL);
 260         }
 261         cafe->datalen = 0;
 262
 263         if (unlikely(regdebug)) {
 264                 int i;
 265                 printk("About to write command %08x to register 0\n", ctl1);
 266                 for (i=4; i< 0x5c; i+=4)
 267                         printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
 268         }
 269
 270         cafe_writel(cafe, ctl1, NAND_CTRL1);
 271         /* Apply this short delay always to ensure that we do wait tWB in
 272          * any case on any machine. */
 273         ndelay(100);
 274
 275         if (1) {
 276                 int c;
 277                 uint32_t irqs;
 278
 279                 for (c = 500000; c != 0; c--) {
 280                         irqs = cafe_readl(cafe, NAND_IRQ);
 281                         if (irqs & doneint)
 282                                 break;
 283                         udelay(1);
 284                         if (!(c % 100000))
 285                                 cafe_dev_dbg(&cafe->pdev->dev, "Wait for ready, IRQ %x\n", irqs);
 286                         cpu_relax();
 287                 }
 288                 cafe_writel(cafe, doneint, NAND_IRQ);
 289                 cafe_dev_dbg(&cafe->pdev->dev, "Command %x completed after %d usec, irqs %x (%x)\n",
 290                              command, 500000-c, irqs, cafe_readl(cafe, NAND_IRQ));
 291         }
 292
 293         WARN_ON(cafe->ctl2 & (1<<30));
 294
 295         switch (command) {
 296
 297         case NAND_CMD_CACHEDPROG:
 298         case NAND_CMD_PAGEPROG:
 299         case NAND_CMD_ERASE1:
 300         case NAND_CMD_ERASE2:
 301         case NAND_CMD_SEQIN:
 302         case NAND_CMD_RNDIN:
 303         case NAND_CMD_STATUS:
 304         case NAND_CMD_DEPLETE1:
 305         case NAND_CMD_RNDOUT:
 306         case NAND_CMD_STATUS_ERROR:
 307         case NAND_CMD_STATUS_ERROR0:
 308         case NAND_CMD_STATUS_ERROR1:
 309         case NAND_CMD_STATUS_ERROR2:
 310         case NAND_CMD_STATUS_ERROR3:
 311                 cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
 312                 return;
 313         }
 314         nand_wait_ready(mtd);
 315         cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
 316 }
 317
 318 static void cafe_select_chip(struct mtd_info *mtd, int chipnr)
 319 {
 320         struct cafe_priv *cafe = mtd->priv;
 321
 322         cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
 323
 324         /* Mask the appropriate bit into the stored value of ctl1
 325            which will be used by cafe_nand_cmdfunc() */
 326         if (chipnr)
 327                 cafe->ctl1 |= CTRL1_CHIPSELECT;
 328         else
 329                 cafe->ctl1 &= ~CTRL1_CHIPSELECT;
 330 }
 331
 332 static int cafe_nand_interrupt(int irq, void *id)
 333 {
 334         struct mtd_info *mtd = id;
 335         struct cafe_priv *cafe = mtd->priv;
 336         uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
 337         cafe_writel(cafe, irqs & ~0x90000000, NAND_IRQ);
 338         if (!irqs)
 339                 return IRQ_NONE;
 340
 341         cafe_dev_dbg(&cafe->pdev->dev, "irq, bits %x (%x)\n", irqs, cafe_readl(cafe, NAND_IRQ));
 342         return IRQ_HANDLED;
 343 }
 344
 345 static void cafe_nand_bug(struct mtd_info *mtd)
 346 {
 347         BUG();
 348 }
 349
 350 static int cafe_nand_write_oob(struct mtd_info *mtd,
 351                                struct nand_chip *chip, int page)
 352 {
 353         int status = 0;
 354
 355         chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
 356         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 357         chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 358         status = chip->waitfunc(mtd, chip);
 359
 360         return status & NAND_STATUS_FAIL ? -EIO : 0;
 361 }
 362
 363 /* Don't use -- use nand_read_oob_std for now */
 364 static int cafe_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 365                               int page, int sndcmd)
 366 {
 367         chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
 368         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 369         return 1;
 370 }
 371 /**
 372  * cafe_nand_read_page_syndrome - {REPLACABLE] hardware ecc syndrom based page read
 373  * @mtd:        mtd info structure
 374  * @chip:       nand chip info structure
 375  * @buf:        buffer to store read data
 376  *
 377  * The hw generator calculates the error syndrome automatically. Therefor
 378  * we need a special oob layout and handling.
 379  */
 380 static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 381                                uint8_t *buf)
 382 {
 383         struct cafe_priv *cafe = mtd->priv;
 384
 385         cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
 386                      cafe_readl(cafe, NAND_ECC_RESULT),
 387                      cafe_readl(cafe, NAND_ECC_SYN01));
 388
 389         chip->read_buf(mtd, buf, mtd->writesize);
 390         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 391
 392         if (checkecc && cafe_readl(cafe, NAND_ECC_RESULT) & (1<<18)) {
 393                 unsigned short syn[8], pat[4];
 394                 int pos[4];
 395                 u8 *oob = chip->oob_poi;
 396                 int i, n;
 397
 398                 for (i=0; i<8; i+=2) {
 399                         uint32_t tmp = cafe_readl(cafe, NAND_ECC_SYN01 + (i*2));
 400                         syn[i] = cafe->rs->index_of[tmp & 0xfff];
 401                         syn[i+1] = cafe->rs->index_of[(tmp >> 16) & 0xfff];
 402                 }
 403
 404                 n = decode_rs16(cafe->rs, NULL, NULL, 1367, syn, 0, pos, 0,
 405                                 pat);
 406
 407                 for (i = 0; i < n; i++) {
 408                         int p = pos[i];
 409
 410                         /* The 12-bit symbols are mapped to bytes here */
 411
 412                         if (p > 1374) {
 413                                 /* out of range */
 414                                 n = -1374;
 415                         } else if (p == 0) {
 416                                 /* high four bits do not correspond to data */
 417                                 if (pat[i] > 0xff)
 418                                         n = -2048;
 419                                 else
 420                                         buf[0] ^= pat[i];
 421                         } else if (p == 1365) {
 422                                 buf[2047] ^= pat[i] >> 4;
 423                                 oob[0] ^= pat[i] << 4;
 424                         } else if (p > 1365) {
 425                                 if ((p & 1) == 1) {
 426                                         oob[3*p/2 - 2048] ^= pat[i] >> 4;
 427                                         oob[3*p/2 - 2047] ^= pat[i] << 4;
 428                                 } else {
 429                                         oob[3*p/2 - 2049] ^= pat[i] >> 8;
 430                                         oob[3*p/2 - 2048] ^= pat[i];
 431                                 }
 432                         } else if ((p & 1) == 1) {
 433                                 buf[3*p/2] ^= pat[i] >> 4;
 434                                 buf[3*p/2 + 1] ^= pat[i] << 4;
 435                         } else {
 436                                 buf[3*p/2 - 1] ^= pat[i] >> 8;
 437                                 buf[3*p/2] ^= pat[i];
 438                         }
 439                 }
 440
 441                 if (n < 0) {
 442                         dev_dbg(&cafe->pdev->dev, "Failed to correct ECC at %08x\n",
 443                                 cafe_readl(cafe, NAND_ADDR2) * 2048);
 444                         for (i = 0; i < 0x5c; i += 4)
 445                                 printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
 446                         mtd->ecc_stats.failed++;
 447                 } else {
 448                         dev_dbg(&cafe->pdev->dev, "Corrected %d symbol errors\n", n);
 449                         mtd->ecc_stats.corrected += n;
 450                 }
 451         }
 452
 453         return 0;
 454 }
 455
 456 static struct nand_ecclayout cafe_oobinfo_2048 = {
 457         .eccbytes = 14,
 458         .eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
 459         .oobfree = {{14, 50}}
 460 };
 461
 462 /* Ick. The BBT code really ought to be able to work this bit out
 463    for itself from the above, at least for the 2KiB case */
 464 static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
 465 static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
 466
 467 static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
 468 static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
 469
 470
 471 static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
 472         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 473                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 474         .offs = 14,
 475         .len = 4,
 476         .veroffs = 18,
 477         .maxblocks = 4,
 478         .pattern = cafe_bbt_pattern_2048
 479 };
 480
 481 static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
 482         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 483                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 484         .offs = 14,
 485         .len = 4,
 486         .veroffs = 18,
 487         .maxblocks = 4,
 488         .pattern = cafe_mirror_pattern_2048
 489 };
 490
 491 static struct nand_ecclayout cafe_oobinfo_512 = {
 492         .eccbytes = 14,
 493         .eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
 494         .oobfree = {{14, 2}}
 495 };
 496
 497 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
 498         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 499                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 500         .offs = 14,
 501         .len = 1,
 502         .veroffs = 15,
 503         .maxblocks = 4,
 504         .pattern = cafe_bbt_pattern_512
 505 };
 506
 507 static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
 508         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 509                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 510         .offs = 14,
 511         .len = 1,
 512         .veroffs = 15,
 513         .maxblocks = 4,
 514         .pattern = cafe_mirror_pattern_512
 515 };
 516
 517
 518 static void cafe_nand_write_page_lowlevel(struct mtd_info *mtd,
 519                                           struct nand_chip *chip, const uint8_t *buf)
 520 {
 521         struct cafe_priv *cafe = mtd->priv;
 522
 523         chip->write_buf(mtd, buf, mtd->writesize);
 524         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 525
 526         /* Set up ECC autogeneration */
 527         cafe->ctl2 |= (1<<30);
 528 }
 529
 530 static int cafe_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 531                                 const uint8_t *buf, int page, int cached, int raw)
 532 {
 533         int status;
 534
 535         chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
 536
 537         if (unlikely(raw))
 538                 chip->ecc.write_page_raw(mtd, chip, buf);
 539         else
 540                 chip->ecc.write_page(mtd, chip, buf);
 541
 542         /*
 543          * Cached progamming disabled for now, Not sure if its worth the
 544          * trouble. The speed gain is not very impressive. (2.3->2.6Mib/s)
 545          */
 546         cached = 0;
 547
 548         if (!cached || !(chip->options & NAND_CACHEPRG)) {
 549
 550                 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 551                 status = chip->waitfunc(mtd, chip);
 552                 /*
 553                  * See if operation failed and additional status checks are
 554                  * available
 555                  */
 556                 if ((status & NAND_STATUS_FAIL) && (chip->errstat))
 557                         status = chip->errstat(mtd, chip, FL_WRITING, status,
 558                                                page);
 559
 560                 if (status & NAND_STATUS_FAIL)
 561                         return -EIO;
 562         } else {
 563                 chip->cmdfunc(mtd, NAND_CMD_CACHEDPROG, -1, -1);
 564                 status = chip->waitfunc(mtd, chip);
 565         }
 566
 567 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
 568         /* Send command to read back the data */
 569         chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 570
 571         if (chip->verify_buf(mtd, buf, mtd->writesize))
 572                 return -EIO;
 573 #endif
 574         return 0;
 575 }
 576
 577 static int cafe_nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
 578 {
 579         return 0;
 580 }
 581
 582 /* F_2[X]/(X**6+X+1)  */
 583 static unsigned short __devinit gf64_mul(u8 a, u8 b)
 584 {
 585         u8 c;
 586         unsigned int i;
 587
 588         c = 0;
 589         for (i = 0; i < 6; i++) {
 590                 if (a & 1)
 591                         c ^= b;
 592                 a >>= 1;
 593                 b <<= 1;
 594                 if ((b & 0x40) != 0)
 595                         b ^= 0x43;
 596         }
 597
 598         return c;
 599 }
 600
 601 /* F_64[X]/(X**2+X+A**-1) with A the generator of F_64[X]  */
 602 static u16 __devinit gf4096_mul(u16 a, u16 b)
 603 {
 604         u8 ah, al, bh, bl, ch, cl;
 605
 606         ah = a >> 6;
 607         al = a & 0x3f;
 608         bh = b >> 6;
 609         bl = b & 0x3f;
 610
 611         ch = gf64_mul(ah ^ al, bh ^ bl) ^ gf64_mul(al, bl);
 612         cl = gf64_mul(gf64_mul(ah, bh), 0x21) ^ gf64_mul(al, bl);
 613
 614         return (ch << 6) ^ cl;
 615 }
 616
 617 static int __devinit cafe_mul(int x)
 618 {
 619         if (x == 0)
 620                 return 1;
 621         return gf4096_mul(x, 0xe01);
 622 }
 623
 624 static int __devinit cafe_nand_probe(struct pci_dev *pdev,
 625                                      const struct pci_device_id *ent)
 626 {
 627         struct mtd_info *mtd;
 628         struct cafe_priv *cafe;
 629         uint32_t ctrl;
 630         int err = 0;
 631 #ifdef CONFIG_MTD_PARTITIONS
 632         struct mtd_partition *parts;
 633         int nr_parts;
 634 #endif
 635
 636         /* Very old versions shared the same PCI ident for all three
 637            functions on the chip. Verify the class too... */
 638         if ((pdev->class >> 8) != PCI_CLASS_MEMORY_FLASH)
 639                 return -ENODEV;
 640
 641         err = pci_enable_device(pdev);
 642         if (err)
 643                 return err;
 644
 645         pci_set_master(pdev);
 646
 647         mtd = kzalloc(sizeof(*mtd) + sizeof(struct cafe_priv), GFP_KERNEL);
 648         if (!mtd) {
 649                 dev_warn(&pdev->dev, "failed to alloc mtd_info\n");
 650                 return  -ENOMEM;
 651         }
 652         cafe = (void *)(&mtd[1]);
 653
 654         mtd->priv = cafe;
 655         mtd->owner = THIS_MODULE;
 656
 657         cafe->pdev = pdev;
 658         cafe->mmio = pci_iomap(pdev, 0, 0);
 659         if (!cafe->mmio) {
 660                 dev_warn(&pdev->dev, "failed to iomap\n");
 661                 err = -ENOMEM;
 662                 goto out_free_mtd;
 663         }
 664         cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112 + sizeof(struct nand_buffers),
 665                                           &cafe->dmaaddr, GFP_KERNEL);
 666         if (!cafe->dmabuf) {
 667                 err = -ENOMEM;
 668                 goto out_ior;
 669         }
 670         cafe->nand.buffers = (void *)cafe->dmabuf + 2112;
 671
 672         cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8);
 673         if (!cafe->rs) {
 674                 err = -ENOMEM;
 675                 goto out_ior;
 676         }
 677
 678         cafe->nand.cmdfunc = cafe_nand_cmdfunc;
 679         cafe->nand.dev_ready = cafe_device_ready;
 680         cafe->nand.read_byte = cafe_read_byte;
 681         cafe->nand.read_buf = cafe_read_buf;
 682         cafe->nand.write_buf = cafe_write_buf;
 683         cafe->nand.select_chip = cafe_select_chip;
 684
 685         cafe->nand.chip_delay = 0;
 686
 687         /* Enable the following for a flash based bad block table */
 688         cafe->nand.options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR | NAND_OWN_BUFFERS;
 689
 690         if (skipbbt) {
 691                 cafe->nand.options |= NAND_SKIP_BBTSCAN;
 692                 cafe->nand.block_bad = cafe_nand_block_bad;
 693         }
 694
 695         if (numtimings && numtimings != 3) {
 696                 dev_warn(&cafe->pdev->dev, "%d timing register values ignored; precisely three are required\n", numtimings);
 697         }
 698
 699         if (numtimings == 3) {
 700                 cafe_dev_dbg(&cafe->pdev->dev, "Using provided timings (%08x %08x %08x)\n",
 701                              timing[0], timing[1], timing[2]);
 702         } else {
 703                 timing[0] = cafe_readl(cafe, NAND_TIMING1);
 704                 timing[1] = cafe_readl(cafe, NAND_TIMING2);
 705                 timing[2] = cafe_readl(cafe, NAND_TIMING3);
 706
 707                 if (timing[0] | timing[1] | timing[2]) {
 708                         cafe_dev_dbg(&cafe->pdev->dev, "Timing registers already set (%08x %08x %08x)\n",
 709                                      timing[0], timing[1], timing[2]);
 710                 } else {
 711                         dev_warn(&cafe->pdev->dev, "Timing registers unset; using most conservative defaults\n");
 712                         timing[0] = timing[1] = timing[2] = 0xffffffff;
 713                 }
 714         }
 715
 716         /* Start off by resetting the NAND controller completely */
 717         cafe_writel(cafe, 1, NAND_RESET);
 718         cafe_writel(cafe, 0, NAND_RESET);
 719
 720         cafe_writel(cafe, timing[0], NAND_TIMING1);
 721         cafe_writel(cafe, timing[1], NAND_TIMING2);
 722         cafe_writel(cafe, timing[2], NAND_TIMING3);
 723
 724         cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
 725         err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
 726                           "CAFE NAND", mtd);
 727         if (err) {
 728                 dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);
 729                 goto out_free_dma;
 730         }
 731
 732         /* Disable master reset, enable NAND clock */
 733         ctrl = cafe_readl(cafe, GLOBAL_CTRL);
 734         ctrl &= 0xffffeff0;
 735         ctrl |= 0x00007000;
 736         cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
 737         cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
 738         cafe_writel(cafe, 0, NAND_DMA_CTRL);
 739
 740         cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
 741         cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
 742
 743         /* Set up DMA address */
 744         cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
 745         if (sizeof(cafe->dmaaddr) > 4)
 746                 /* Shift in two parts to shut the compiler up */
 747                 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
 748         else
 749                 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
 750
 751         cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
 752                 cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
 753
 754         /* Enable NAND IRQ in global IRQ mask register */
 755         cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
 756         cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n",
 757                 cafe_readl(cafe, GLOBAL_CTRL), cafe_readl(cafe, GLOBAL_IRQ_MASK));
 758
 759         /* Scan to find existence of the device */
 760         if (nand_scan_ident(mtd, 2)) {
 761                 err = -ENXIO;
 762                 goto out_irq;
 763         }
 764
 765         cafe->ctl2 = 1<<27; /* Reed-Solomon ECC */
 766         if (mtd->writesize == 2048)
 767                 cafe->ctl2 |= 1<<29; /* 2KiB page size */
 768
 769         /* Set up ECC according to the type of chip we found */
 770         if (mtd->writesize == 2048) {
 771                 cafe->nand.ecc.layout = &cafe_oobinfo_2048;
 772                 cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
 773                 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
 774         } else if (mtd->writesize == 512) {
 775                 cafe->nand.ecc.layout = &cafe_oobinfo_512;
 776                 cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
 777                 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
 778         } else {
 779                 printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n",
 780                        mtd->writesize);
 781                 goto out_irq;
 782         }
 783         cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
 784         cafe->nand.ecc.size = mtd->writesize;
 785         cafe->nand.ecc.bytes = 14;
 786         cafe->nand.ecc.hwctl  = (void *)cafe_nand_bug;
 787         cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
 788         cafe->nand.ecc.correct  = (void *)cafe_nand_bug;
 789         cafe->nand.write_page = cafe_nand_write_page;
 790         cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
 791         cafe->nand.ecc.write_oob = cafe_nand_write_oob;
 792         cafe->nand.ecc.read_page = cafe_nand_read_page;
 793         cafe->nand.ecc.read_oob = cafe_nand_read_oob;
 794
 795         err = nand_scan_tail(mtd);
 796         if (err)
 797                 goto out_irq;
 798
 799         pci_set_drvdata(pdev, mtd);
 800
 801         /* We register the whole device first, separate from the partitions */
 802         add_mtd_device(mtd);
 803
 804 #ifdef CONFIG_MTD_PARTITIONS
 805         nr_parts = parse_mtd_partitions(mtd, part_probes, &parts, 0);
 806         if (nr_parts > 0) {
 807                 cafe->parts = parts;
 808                 dev_info(&cafe->pdev->dev, "%d RedBoot partitions found\n", nr_parts);
 809                 add_mtd_partitions(mtd, parts, nr_parts);
 810         }
 811 #endif
 812         goto out;
 813
 814  out_irq:
 815         /* Disable NAND IRQ in global IRQ mask register */
 816         cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
 817         free_irq(pdev->irq, mtd);
 818  out_free_dma:
 819         dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
 820  out_ior:
 821         pci_iounmap(pdev, cafe->mmio);
 822  out_free_mtd:
 823         kfree(mtd);
 824  out:
 825         return err;
 826 }
 827
 828 static void __devexit cafe_nand_remove(struct pci_dev *pdev)
 829 {
 830         struct mtd_info *mtd = pci_get_drvdata(pdev);
 831         struct cafe_priv *cafe = mtd->priv;
 832
 833         del_mtd_device(mtd);
 834         /* Disable NAND IRQ in global IRQ mask register */
 835         cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
 836         free_irq(pdev->irq, mtd);
 837         nand_release(mtd);
 838         free_rs(cafe->rs);
 839         pci_iounmap(pdev, cafe->mmio);
 840         dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
 841         kfree(mtd);
 842 }
 843
 844 static struct pci_device_id cafe_nand_tbl[] = {
 845         { 0x11ab, 0x4100, PCI_ANY_ID, PCI_ANY_ID },
 846         { }
 847 };
 848
 849 MODULE_DEVICE_TABLE(pci, cafe_nand_tbl);
 850
 851 static int cafe_nand_resume(struct pci_dev *pdev)
 852 {
 853         uint32_t ctrl;
 854         struct mtd_info *mtd = pci_get_drvdata(pdev);
 855         struct cafe_priv *cafe = mtd->priv;
 856
 857        /* Start off by resetting the NAND controller completely */
 858         cafe_writel(cafe, 1, NAND_RESET);
 859         cafe_writel(cafe, 0, NAND_RESET);
 860         cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
 861
 862         /* Restore timing configuration */
 863         cafe_writel(cafe, timing[0], NAND_TIMING1);
 864         cafe_writel(cafe, timing[1], NAND_TIMING2);
 865         cafe_writel(cafe, timing[2], NAND_TIMING3);
 866
 867         /* Disable master reset, enable NAND clock */
 868         ctrl = cafe_readl(cafe, GLOBAL_CTRL);
 869         ctrl &= 0xffffeff0;
 870         ctrl |= 0x00007000;
 871         cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
 872         cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
 873         cafe_writel(cafe, 0, NAND_DMA_CTRL);
 874         cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
 875         cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
 876
 877         /* Set up DMA address */
 878         cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
 879         if (sizeof(cafe->dmaaddr) > 4)
 880         /* Shift in two parts to shut the compiler up */
 881                 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
 882         else
 883                 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
 884
 885         /* Enable NAND IRQ in global IRQ mask register */
 886         cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
 887         return 0;
 888 }
 889
 890 static struct pci_driver cafe_nand_pci_driver = {
 891         .name = "CAFÉ NAND",
 892         .id_table = cafe_nand_tbl,
 893         .probe = cafe_nand_probe,
 894         .remove = __devexit_p(cafe_nand_remove),
 895         .resume = cafe_nand_resume,
 896 };
 897
 898 static int cafe_nand_init(void)
 899 {
 900         return pci_register_driver(&cafe_nand_pci_driver);
 901 }
 902
 903 static void cafe_nand_exit(void)
 904 {
 905         pci_unregister_driver(&cafe_nand_pci_driver);
 906 }
 907 module_init(cafe_nand_init);
 908 module_exit(cafe_nand_exit);
 909
 910 MODULE_LICENSE("GPL");
 911 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 912 MODULE_DESCRIPTION("NAND flash driver for OLPC CAFÉ chip");