drivers/mtd/nand/cafe_nand.c

   1 /*
   2  * Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
   3  *
   4  * The data sheet for this device can be found at:
   5  *    http://www.marvell.com/products/pcconn/88ALP01.jsp
   6  *
   7  * Copyright © 2006 Red Hat, Inc.
   8  * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
   9  */
  10
  11 #define DEBUG
  12
  13 #include <linux/device.h>
  14 #undef DEBUG
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/nand.h>
  17 #include <linux/mtd/partitions.h>
  18 #include <linux/rslib.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/dma-mapping.h>
  23 #include <asm/io.h>
  24
  25 #define CAFE_NAND_CTRL1         0x00
  26 #define CAFE_NAND_CTRL2         0x04
  27 #define CAFE_NAND_CTRL3         0x08
  28 #define CAFE_NAND_STATUS        0x0c
  29 #define CAFE_NAND_IRQ           0x10
  30 #define CAFE_NAND_IRQ_MASK      0x14
  31 #define CAFE_NAND_DATA_LEN      0x18
  32 #define CAFE_NAND_ADDR1         0x1c
  33 #define CAFE_NAND_ADDR2         0x20
  34 #define CAFE_NAND_TIMING1       0x24
  35 #define CAFE_NAND_TIMING2       0x28
  36 #define CAFE_NAND_TIMING3       0x2c
  37 #define CAFE_NAND_NONMEM        0x30
  38 #define CAFE_NAND_ECC_RESULT    0x3C
  39 #define CAFE_NAND_DMA_CTRL      0x40
  40 #define CAFE_NAND_DMA_ADDR0     0x44
  41 #define CAFE_NAND_DMA_ADDR1     0x48
  42 #define CAFE_NAND_ECC_SYN01     0x50
  43 #define CAFE_NAND_ECC_SYN23     0x54
  44 #define CAFE_NAND_ECC_SYN45     0x58
  45 #define CAFE_NAND_ECC_SYN67     0x5c
  46 #define CAFE_NAND_READ_DATA     0x1000
  47 #define CAFE_NAND_WRITE_DATA    0x2000
  48
  49 #define CAFE_GLOBAL_CTRL        0x3004
  50 #define CAFE_GLOBAL_IRQ         0x3008
  51 #define CAFE_GLOBAL_IRQ_MASK    0x300c
  52 #define CAFE_NAND_RESET         0x3034
  53
  54 /* Missing from the datasheet: bit 19 of CTRL1 sets CE0 vs. CE1 */
  55 #define CTRL1_CHIPSELECT        (1<<19)
  56
  57 struct cafe_priv {
  58         struct nand_chip nand;
  59         struct mtd_partition *parts;
  60         struct pci_dev *pdev;
  61         void __iomem *mmio;
  62         struct rs_control *rs;
  63         uint32_t ctl1;
  64         uint32_t ctl2;
  65         int datalen;
  66         int nr_data;
  67         int data_pos;
  68         int page_addr;
  69         dma_addr_t dmaaddr;
  70         unsigned char *dmabuf;
  71 };
  72
  73 static int usedma = 1;
  74 module_param(usedma, int, 0644);
  75
  76 static int skipbbt = 0;
  77 module_param(skipbbt, int, 0644);
  78
  79 static int debug = 0;
  80 module_param(debug, int, 0644);
  81
  82 static int regdebug = 0;
  83 module_param(regdebug, int, 0644);
  84
  85 static int checkecc = 1;
  86 module_param(checkecc, int, 0644);
  87
  88 static unsigned int numtimings;
  89 static int timing[3];
  90 module_param_array(timing, int, &numtimings, 0644);
  91
  92 #ifdef CONFIG_MTD_PARTITIONS
  93 static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
  94 #endif
  95
  96 /* Hrm. Why isn't this already conditional on something in the struct device? */
  97 #define cafe_dev_dbg(dev, args...) do { if (debug) dev_dbg(dev, ##args); } while(0)
  98
  99 /* Make it easier to switch to PIO if we need to */
 100 #define cafe_readl(cafe, addr)                  readl((cafe)->mmio + CAFE_##addr)
 101 #define cafe_writel(cafe, datum, addr)          writel(datum, (cafe)->mmio + CAFE_##addr)
 102
 103 static int cafe_device_ready(struct mtd_info *mtd)
 104 {
 105         struct cafe_priv *cafe = mtd->priv;
 106         int result = !!(cafe_readl(cafe, NAND_STATUS) | 0x40000000);
 107         uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
 108
 109         cafe_writel(cafe, irqs, NAND_IRQ);
 110
 111         cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
 112                 result?"":" not", irqs, cafe_readl(cafe, NAND_IRQ),
 113                 cafe_readl(cafe, GLOBAL_IRQ), cafe_readl(cafe, GLOBAL_IRQ_MASK));
 114
 115         return result;
 116 }
 117
 118
 119 static void cafe_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 120 {
 121         struct cafe_priv *cafe = mtd->priv;
 122
 123         if (usedma)
 124                 memcpy(cafe->dmabuf + cafe->datalen, buf, len);
 125         else
 126                 memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
 127
 128         cafe->datalen += len;
 129
 130         cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
 131                 len, cafe->datalen);
 132 }
 133
 134 static void cafe_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 135 {
 136         struct cafe_priv *cafe = mtd->priv;
 137
 138         if (usedma)
 139                 memcpy(buf, cafe->dmabuf + cafe->datalen, len);
 140         else
 141                 memcpy_fromio(buf, cafe->mmio + CAFE_NAND_READ_DATA + cafe->datalen, len);
 142
 143         cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes from position 0x%x in read buffer.\n",
 144                   len, cafe->datalen);
 145         cafe->datalen += len;
 146 }
 147
 148 static uint8_t cafe_read_byte(struct mtd_info *mtd)
 149 {
 150         struct cafe_priv *cafe = mtd->priv;
 151         uint8_t d;
 152
 153         cafe_read_buf(mtd, &d, 1);
 154         cafe_dev_dbg(&cafe->pdev->dev, "Read %02x\n", d);
 155
 156         return d;
 157 }
 158
 159 static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
 160                               int column, int page_addr)
 161 {
 162         struct cafe_priv *cafe = mtd->priv;
 163         int adrbytes = 0;
 164         uint32_t ctl1;
 165         uint32_t doneint = 0x80000000;
 166
 167         cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
 168                 command, column, page_addr);
 169
 170         if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
 171                 /* Second half of a command we already calculated */
 172                 cafe_writel(cafe, cafe->ctl2 | 0x100 | command, NAND_CTRL2);
 173                 ctl1 = cafe->ctl1;
 174                 cafe->ctl2 &= ~(1<<30);
 175                 cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
 176                           cafe->ctl1, cafe->nr_data);
 177                 goto do_command;
 178         }
 179         /* Reset ECC engine */
 180         cafe_writel(cafe, 0, NAND_CTRL2);
 181
 182         /* Emulate NAND_CMD_READOOB on large-page chips */
 183         if (mtd->writesize > 512 &&
 184             command == NAND_CMD_READOOB) {
 185                 column += mtd->writesize;
 186                 command = NAND_CMD_READ0;
 187         }
 188
 189         /* FIXME: Do we need to send read command before sending data
 190            for small-page chips, to position the buffer correctly? */
 191
 192         if (column != -1) {
 193                 cafe_writel(cafe, column, NAND_ADDR1);
 194                 adrbytes = 2;
 195                 if (page_addr != -1)
 196                         goto write_adr2;
 197         } else if (page_addr != -1) {
 198                 cafe_writel(cafe, page_addr & 0xffff, NAND_ADDR1);
 199                 page_addr >>= 16;
 200         write_adr2:
 201                 cafe_writel(cafe, page_addr, NAND_ADDR2);
 202                 adrbytes += 2;
 203                 if (mtd->size > mtd->writesize << 16)
 204                         adrbytes++;
 205         }
 206
 207         cafe->data_pos = cafe->datalen = 0;
 208
 209         /* Set command valid bit, mask in the chip select bit  */
 210         ctl1 = 0x80000000 | command | (cafe->ctl1 & CTRL1_CHIPSELECT);
 211
 212         /* Set RD or WR bits as appropriate */
 213         if (command == NAND_CMD_READID || command == NAND_CMD_STATUS) {
 214                 ctl1 |= (1<<26); /* rd */
 215                 /* Always 5 bytes, for now */
 216                 cafe->datalen = 4;
 217                 /* And one address cycle -- even for STATUS, since the controller doesn't work without */
 218                 adrbytes = 1;
 219         } else if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
 220                    command == NAND_CMD_READOOB || command == NAND_CMD_RNDOUT) {
 221                 ctl1 |= 1<<26; /* rd */
 222                 /* For now, assume just read to end of page */
 223                 cafe->datalen = mtd->writesize + mtd->oobsize - column;
 224         } else if (command == NAND_CMD_SEQIN)
 225                 ctl1 |= 1<<25; /* wr */
 226
 227         /* Set number of address bytes */
 228         if (adrbytes)
 229                 ctl1 |= ((adrbytes-1)|8) << 27;
 230
 231         if (command == NAND_CMD_SEQIN || command == NAND_CMD_ERASE1) {
 232                 /* Ignore the first command of a pair; the hardware
 233                    deals with them both at once, later */
 234                 cafe->ctl1 = ctl1;
 235                 cafe_dev_dbg(&cafe->pdev->dev, "Setup for delayed command, ctl1 %08x, dlen %x\n",
 236                           cafe->ctl1, cafe->datalen);
 237                 return;
 238         }
 239         /* RNDOUT and READ0 commands need a following byte */
 240         if (command == NAND_CMD_RNDOUT)
 241                 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_RNDOUTSTART, NAND_CTRL2);
 242         else if (command == NAND_CMD_READ0 && mtd->writesize > 512)
 243                 cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_READSTART, NAND_CTRL2);
 244
 245  do_command:
 246         cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
 247                 cafe->datalen, ctl1, cafe_readl(cafe, NAND_CTRL2));
 248
 249         /* NB: The datasheet lies -- we really should be subtracting 1 here */
 250         cafe_writel(cafe, cafe->datalen, NAND_DATA_LEN);
 251         cafe_writel(cafe, 0x90000000, NAND_IRQ);
 252         if (usedma && (ctl1 & (3<<25))) {
 253                 uint32_t dmactl = 0xc0000000 + cafe->datalen;
 254                 /* If WR or RD bits set, set up DMA */
 255                 if (ctl1 & (1<<26)) {
 256                         /* It's a read */
 257                         dmactl |= (1<<29);
 258                         /* ... so it's done when the DMA is done, not just
 259                            the command. */
 260                         doneint = 0x10000000;
 261                 }
 262                 cafe_writel(cafe, dmactl, NAND_DMA_CTRL);
 263         }
 264         cafe->datalen = 0;
 265
 266         if (unlikely(regdebug)) {
 267                 int i;
 268                 printk("About to write command %08x to register 0\n", ctl1);
 269                 for (i=4; i< 0x5c; i+=4)
 270                         printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
 271         }
 272
 273         cafe_writel(cafe, ctl1, NAND_CTRL1);
 274         /* Apply this short delay always to ensure that we do wait tWB in
 275          * any case on any machine. */
 276         ndelay(100);
 277
 278         if (1) {
 279                 int c;
 280                 uint32_t irqs;
 281
 282                 for (c = 500000; c != 0; c--) {
 283                         irqs = cafe_readl(cafe, NAND_IRQ);
 284                         if (irqs & doneint)
 285                                 break;
 286                         udelay(1);
 287                         if (!(c % 100000))
 288                                 cafe_dev_dbg(&cafe->pdev->dev, "Wait for ready, IRQ %x\n", irqs);
 289                         cpu_relax();
 290                 }
 291                 cafe_writel(cafe, doneint, NAND_IRQ);
 292                 cafe_dev_dbg(&cafe->pdev->dev, "Command %x completed after %d usec, irqs %x (%x)\n",
 293                              command, 500000-c, irqs, cafe_readl(cafe, NAND_IRQ));
 294         }
 295
 296         WARN_ON(cafe->ctl2 & (1<<30));
 297
 298         switch (command) {
 299
 300         case NAND_CMD_CACHEDPROG:
 301         case NAND_CMD_PAGEPROG:
 302         case NAND_CMD_ERASE1:
 303         case NAND_CMD_ERASE2:
 304         case NAND_CMD_SEQIN:
 305         case NAND_CMD_RNDIN:
 306         case NAND_CMD_STATUS:
 307         case NAND_CMD_DEPLETE1:
 308         case NAND_CMD_RNDOUT:
 309         case NAND_CMD_STATUS_ERROR:
 310         case NAND_CMD_STATUS_ERROR0:
 311         case NAND_CMD_STATUS_ERROR1:
 312         case NAND_CMD_STATUS_ERROR2:
 313         case NAND_CMD_STATUS_ERROR3:
 314                 cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
 315                 return;
 316         }
 317         nand_wait_ready(mtd);
 318         cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
 319 }
 320
 321 static void cafe_select_chip(struct mtd_info *mtd, int chipnr)
 322 {
 323         struct cafe_priv *cafe = mtd->priv;
 324
 325         cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
 326
 327         /* Mask the appropriate bit into the stored value of ctl1
 328            which will be used by cafe_nand_cmdfunc() */
 329         if (chipnr)
 330                 cafe->ctl1 |= CTRL1_CHIPSELECT;
 331         else
 332                 cafe->ctl1 &= ~CTRL1_CHIPSELECT;
 333 }
 334
 335 static irqreturn_t cafe_nand_interrupt(int irq, void *id)
 336 {
 337         struct mtd_info *mtd = id;
 338         struct cafe_priv *cafe = mtd->priv;
 339         uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
 340         cafe_writel(cafe, irqs & ~0x90000000, NAND_IRQ);
 341         if (!irqs)
 342                 return IRQ_NONE;
 343
 344         cafe_dev_dbg(&cafe->pdev->dev, "irq, bits %x (%x)\n", irqs, cafe_readl(cafe, NAND_IRQ));
 345         return IRQ_HANDLED;
 346 }
 347
 348 static void cafe_nand_bug(struct mtd_info *mtd)
 349 {
 350         BUG();
 351 }
 352
 353 static int cafe_nand_write_oob(struct mtd_info *mtd,
 354                                struct nand_chip *chip, int page)
 355 {
 356         int status = 0;
 357
 358         chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
 359         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 360         chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 361         status = chip->waitfunc(mtd, chip);
 362
 363         return status & NAND_STATUS_FAIL ? -EIO : 0;
 364 }
 365
 366 /* Don't use -- use nand_read_oob_std for now */
 367 static int cafe_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 368                               int page, int sndcmd)
 369 {
 370         chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
 371         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 372         return 1;
 373 }
 374 /**
 375  * cafe_nand_read_page_syndrome - {REPLACABLE] hardware ecc syndrom based page read
 376  * @mtd:        mtd info structure
 377  * @chip:       nand chip info structure
 378  * @buf:        buffer to store read data
 379  *
 380  * The hw generator calculates the error syndrome automatically. Therefor
 381  * we need a special oob layout and handling.
 382  */
 383 static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 384                                uint8_t *buf)
 385 {
 386         struct cafe_priv *cafe = mtd->priv;
 387
 388         cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
 389                      cafe_readl(cafe, NAND_ECC_RESULT),
 390                      cafe_readl(cafe, NAND_ECC_SYN01));
 391
 392         chip->read_buf(mtd, buf, mtd->writesize);
 393         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 394
 395         if (checkecc && cafe_readl(cafe, NAND_ECC_RESULT) & (1<<18)) {
 396                 unsigned short syn[8], pat[4];
 397                 int pos[4];
 398                 u8 *oob = chip->oob_poi;
 399                 int i, n;
 400
 401                 for (i=0; i<8; i+=2) {
 402                         uint32_t tmp = cafe_readl(cafe, NAND_ECC_SYN01 + (i*2));
 403                         syn[i] = cafe->rs->index_of[tmp & 0xfff];
 404                         syn[i+1] = cafe->rs->index_of[(tmp >> 16) & 0xfff];
 405                 }
 406
 407                 n = decode_rs16(cafe->rs, NULL, NULL, 1367, syn, 0, pos, 0,
 408                                 pat);
 409
 410                 for (i = 0; i < n; i++) {
 411                         int p = pos[i];
 412
 413                         /* The 12-bit symbols are mapped to bytes here */
 414
 415                         if (p > 1374) {
 416                                 /* out of range */
 417                                 n = -1374;
 418                         } else if (p == 0) {
 419                                 /* high four bits do not correspond to data */
 420                                 if (pat[i] > 0xff)
 421                                         n = -2048;
 422                                 else
 423                                         buf[0] ^= pat[i];
 424                         } else if (p == 1365) {
 425                                 buf[2047] ^= pat[i] >> 4;
 426                                 oob[0] ^= pat[i] << 4;
 427                         } else if (p > 1365) {
 428                                 if ((p & 1) == 1) {
 429                                         oob[3*p/2 - 2048] ^= pat[i] >> 4;
 430                                         oob[3*p/2 - 2047] ^= pat[i] << 4;
 431                                 } else {
 432                                         oob[3*p/2 - 2049] ^= pat[i] >> 8;
 433                                         oob[3*p/2 - 2048] ^= pat[i];
 434                                 }
 435                         } else if ((p & 1) == 1) {
 436                                 buf[3*p/2] ^= pat[i] >> 4;
 437                                 buf[3*p/2 + 1] ^= pat[i] << 4;
 438                         } else {
 439                                 buf[3*p/2 - 1] ^= pat[i] >> 8;
 440                                 buf[3*p/2] ^= pat[i];
 441                         }
 442                 }
 443
 444                 if (n < 0) {
 445                         dev_dbg(&cafe->pdev->dev, "Failed to correct ECC at %08x\n",
 446                                 cafe_readl(cafe, NAND_ADDR2) * 2048);
 447                         for (i = 0; i < 0x5c; i += 4)
 448                                 printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
 449                         mtd->ecc_stats.failed++;
 450                 } else {
 451                         dev_dbg(&cafe->pdev->dev, "Corrected %d symbol errors\n", n);
 452                         mtd->ecc_stats.corrected += n;
 453                 }
 454         }
 455
 456         return 0;
 457 }
 458
 459 static struct nand_ecclayout cafe_oobinfo_2048 = {
 460         .eccbytes = 14,
 461         .eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
 462         .oobfree = {{14, 50}}
 463 };
 464
 465 /* Ick. The BBT code really ought to be able to work this bit out
 466    for itself from the above, at least for the 2KiB case */
 467 static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
 468 static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
 469
 470 static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
 471 static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
 472
 473
 474 static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
 475         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 476                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 477         .offs = 14,
 478         .len = 4,
 479         .veroffs = 18,
 480         .maxblocks = 4,
 481         .pattern = cafe_bbt_pattern_2048
 482 };
 483
 484 static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
 485         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 486                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 487         .offs = 14,
 488         .len = 4,
 489         .veroffs = 18,
 490         .maxblocks = 4,
 491         .pattern = cafe_mirror_pattern_2048
 492 };
 493
 494 static struct nand_ecclayout cafe_oobinfo_512 = {
 495         .eccbytes = 14,
 496         .eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
 497         .oobfree = {{14, 2}}
 498 };
 499
 500 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
 501         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 502                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 503         .offs = 14,
 504         .len = 1,
 505         .veroffs = 15,
 506         .maxblocks = 4,
 507         .pattern = cafe_bbt_pattern_512
 508 };
 509
 510 static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
 511         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 512                 | NAND_BBT_2BIT | NAND_BBT_VERSION,
 513         .offs = 14,
 514         .len = 1,
 515         .veroffs = 15,
 516         .maxblocks = 4,
 517         .pattern = cafe_mirror_pattern_512
 518 };
 519
 520
 521 static void cafe_nand_write_page_lowlevel(struct mtd_info *mtd,
 522                                           struct nand_chip *chip, const uint8_t *buf)
 523 {
 524         struct cafe_priv *cafe = mtd->priv;
 525
 526         chip->write_buf(mtd, buf, mtd->writesize);
 527         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 528
 529         /* Set up ECC autogeneration */
 530         cafe->ctl2 |= (1<<30);
 531 }
 532
 533 static int cafe_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 534                                 const uint8_t *buf, int page, int cached, int raw)
 535 {
 536         int status;
 537
 538         chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
 539
 540         if (unlikely(raw))
 541                 chip->ecc.write_page_raw(mtd, chip, buf);
 542         else
 543                 chip->ecc.write_page(mtd, chip, buf);
 544
 545         /*
 546          * Cached progamming disabled for now, Not sure if its worth the
 547          * trouble. The speed gain is not very impressive. (2.3->2.6Mib/s)
 548          */
 549         cached = 0;
 550
 551         if (!cached || !(chip->options & NAND_CACHEPRG)) {
 552
 553                 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 554                 status = chip->waitfunc(mtd, chip);
 555                 /*
 556                  * See if operation failed and additional status checks are
 557                  * available
 558                  */
 559                 if ((status & NAND_STATUS_FAIL) && (chip->errstat))
 560                         status = chip->errstat(mtd, chip, FL_WRITING, status,
 561                                                page);
 562
 563                 if (status & NAND_STATUS_FAIL)
 564                         return -EIO;
 565         } else {
 566                 chip->cmdfunc(mtd, NAND_CMD_CACHEDPROG, -1, -1);
 567                 status = chip->waitfunc(mtd, chip);
 568         }
 569
 570 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
 571         /* Send command to read back the data */
 572         chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 573
 574         if (chip->verify_buf(mtd, buf, mtd->writesize))
 575                 return -EIO;
 576 #endif
 577         return 0;
 578 }
 579
 580 static int cafe_nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
 581 {
 582         return 0;
 583 }
 584
 585 /* F_2[X]/(X**6+X+1)  */
 586 static unsigned short __devinit gf64_mul(u8 a, u8 b)
 587 {
 588         u8 c;
 589         unsigned int i;
 590
 591         c = 0;
 592         for (i = 0; i < 6; i++) {
 593                 if (a & 1)
 594                         c ^= b;
 595                 a >>= 1;
 596                 b <<= 1;
 597                 if ((b & 0x40) != 0)
 598                         b ^= 0x43;
 599         }
 600
 601         return c;
 602 }
 603
 604 /* F_64[X]/(X**2+X+A**-1) with A the generator of F_64[X]  */
 605 static u16 __devinit gf4096_mul(u16 a, u16 b)
 606 {
 607         u8 ah, al, bh, bl, ch, cl;
 608
 609         ah = a >> 6;
 610         al = a & 0x3f;
 611         bh = b >> 6;
 612         bl = b & 0x3f;
 613
 614         ch = gf64_mul(ah ^ al, bh ^ bl) ^ gf64_mul(al, bl);
 615         cl = gf64_mul(gf64_mul(ah, bh), 0x21) ^ gf64_mul(al, bl);
 616
 617         return (ch << 6) ^ cl;
 618 }
 619
 620 static int __devinit cafe_mul(int x)
 621 {
 622         if (x == 0)
 623                 return 1;
 624         return gf4096_mul(x, 0xe01);
 625 }
 626
 627 static int __devinit cafe_nand_probe(struct pci_dev *pdev,
 628                                      const struct pci_device_id *ent)
 629 {
 630         struct mtd_info *mtd;
 631         struct cafe_priv *cafe;
 632         uint32_t ctrl;
 633         int err = 0;
 634 #ifdef CONFIG_MTD_PARTITIONS
 635         struct mtd_partition *parts;
 636         int nr_parts;
 637 #endif
 638
 639         /* Very old versions shared the same PCI ident for all three
 640            functions on the chip. Verify the class too... */
 641         if ((pdev->class >> 8) != PCI_CLASS_MEMORY_FLASH)
 642                 return -ENODEV;
 643
 644         err = pci_enable_device(pdev);
 645         if (err)
 646                 return err;
 647
 648         pci_set_master(pdev);
 649
 650         mtd = kzalloc(sizeof(*mtd) + sizeof(struct cafe_priv), GFP_KERNEL);
 651         if (!mtd) {
 652                 dev_warn(&pdev->dev, "failed to alloc mtd_info\n");
 653                 return  -ENOMEM;
 654         }
 655         cafe = (void *)(&mtd[1]);
 656
 657         mtd->dev.parent = &pdev->dev;
 658         mtd->priv = cafe;
 659         mtd->owner = THIS_MODULE;
 660
 661         cafe->pdev = pdev;
 662         cafe->mmio = pci_iomap(pdev, 0, 0);
 663         if (!cafe->mmio) {
 664                 dev_warn(&pdev->dev, "failed to iomap\n");
 665                 err = -ENOMEM;
 666                 goto out_free_mtd;
 667         }
 668         cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112 + sizeof(struct nand_buffers),
 669                                           &cafe->dmaaddr, GFP_KERNEL);
 670         if (!cafe->dmabuf) {
 671                 err = -ENOMEM;
 672                 goto out_ior;
 673         }
 674         cafe->nand.buffers = (void *)cafe->dmabuf + 2112;
 675
 676         cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8);
 677         if (!cafe->rs) {
 678                 err = -ENOMEM;
 679                 goto out_ior;
 680         }
 681
 682         cafe->nand.cmdfunc = cafe_nand_cmdfunc;
 683         cafe->nand.dev_ready = cafe_device_ready;
 684         cafe->nand.read_byte = cafe_read_byte;
 685         cafe->nand.read_buf = cafe_read_buf;
 686         cafe->nand.write_buf = cafe_write_buf;
 687         cafe->nand.select_chip = cafe_select_chip;
 688
 689         cafe->nand.chip_delay = 0;
 690
 691         /* Enable the following for a flash based bad block table */
 692         cafe->nand.options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR | NAND_OWN_BUFFERS;
 693
 694         if (skipbbt) {
 695                 cafe->nand.options |= NAND_SKIP_BBTSCAN;
 696                 cafe->nand.block_bad = cafe_nand_block_bad;
 697         }
 698
 699         if (numtimings && numtimings != 3) {
 700                 dev_warn(&cafe->pdev->dev, "%d timing register values ignored; precisely three are required\n", numtimings);
 701         }
 702
 703         if (numtimings == 3) {
 704                 cafe_dev_dbg(&cafe->pdev->dev, "Using provided timings (%08x %08x %08x)\n",
 705                              timing[0], timing[1], timing[2]);
 706         } else {
 707                 timing[0] = cafe_readl(cafe, NAND_TIMING1);
 708                 timing[1] = cafe_readl(cafe, NAND_TIMING2);
 709                 timing[2] = cafe_readl(cafe, NAND_TIMING3);
 710
 711                 if (timing[0] | timing[1] | timing[2]) {
 712                         cafe_dev_dbg(&cafe->pdev->dev, "Timing registers already set (%08x %08x %08x)\n",
 713                                      timing[0], timing[1], timing[2]);
 714                 } else {
 715                         dev_warn(&cafe->pdev->dev, "Timing registers unset; using most conservative defaults\n");
 716                         timing[0] = timing[1] = timing[2] = 0xffffffff;
 717                 }
 718         }
 719
 720         /* Start off by resetting the NAND controller completely */
 721         cafe_writel(cafe, 1, NAND_RESET);
 722         cafe_writel(cafe, 0, NAND_RESET);
 723
 724         cafe_writel(cafe, timing[0], NAND_TIMING1);
 725         cafe_writel(cafe, timing[1], NAND_TIMING2);
 726         cafe_writel(cafe, timing[2], NAND_TIMING3);
 727
 728         cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
 729         err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
 730                           "CAFE NAND", mtd);
 731         if (err) {
 732                 dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);
 733                 goto out_free_dma;
 734         }
 735
 736         /* Disable master reset, enable NAND clock */
 737         ctrl = cafe_readl(cafe, GLOBAL_CTRL);
 738         ctrl &= 0xffffeff0;
 739         ctrl |= 0x00007000;
 740         cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
 741         cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
 742         cafe_writel(cafe, 0, NAND_DMA_CTRL);
 743
 744         cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
 745         cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
 746
 747         /* Set up DMA address */
 748         cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
 749         if (sizeof(cafe->dmaaddr) > 4)
 750                 /* Shift in two parts to shut the compiler up */
 751                 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
 752         else
 753                 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
 754
 755         cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
 756                 cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
 757
 758         /* Enable NAND IRQ in global IRQ mask register */
 759         cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
 760         cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n",
 761                 cafe_readl(cafe, GLOBAL_CTRL), cafe_readl(cafe, GLOBAL_IRQ_MASK));
 762
 763         /* Scan to find existence of the device */
 764         if (nand_scan_ident(mtd, 2)) {
 765                 err = -ENXIO;
 766                 goto out_irq;
 767         }
 768
 769         cafe->ctl2 = 1<<27; /* Reed-Solomon ECC */
 770         if (mtd->writesize == 2048)
 771                 cafe->ctl2 |= 1<<29; /* 2KiB page size */
 772
 773         /* Set up ECC according to the type of chip we found */
 774         if (mtd->writesize == 2048) {
 775                 cafe->nand.ecc.layout = &cafe_oobinfo_2048;
 776                 cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
 777                 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
 778         } else if (mtd->writesize == 512) {
 779                 cafe->nand.ecc.layout = &cafe_oobinfo_512;
 780                 cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
 781                 cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
 782         } else {
 783                 printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n",
 784                        mtd->writesize);
 785                 goto out_irq;
 786         }
 787         cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
 788         cafe->nand.ecc.size = mtd->writesize;
 789         cafe->nand.ecc.bytes = 14;
 790         cafe->nand.ecc.hwctl  = (void *)cafe_nand_bug;
 791         cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
 792         cafe->nand.ecc.correct  = (void *)cafe_nand_bug;
 793         cafe->nand.write_page = cafe_nand_write_page;
 794         cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
 795         cafe->nand.ecc.write_oob = cafe_nand_write_oob;
 796         cafe->nand.ecc.read_page = cafe_nand_read_page;
 797         cafe->nand.ecc.read_oob = cafe_nand_read_oob;
 798
 799         err = nand_scan_tail(mtd);
 800         if (err)
 801                 goto out_irq;
 802
 803         pci_set_drvdata(pdev, mtd);
 804
 805         /* We register the whole device first, separate from the partitions */
 806         add_mtd_device(mtd);
 807
 808 #ifdef CONFIG_MTD_PARTITIONS
 809 #ifdef CONFIG_MTD_CMDLINE_PARTS
 810         mtd->name = "cafe_nand";
 811 #endif
 812         nr_parts = parse_mtd_partitions(mtd, part_probes, &parts, 0);
 813         if (nr_parts > 0) {
 814                 cafe->parts = parts;
 815                 dev_info(&cafe->pdev->dev, "%d partitions found\n", nr_parts);
 816                 add_mtd_partitions(mtd, parts, nr_parts);
 817         }
 818 #endif
 819         goto out;
 820
 821  out_irq:
 822         /* Disable NAND IRQ in global IRQ mask register */
 823         cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
 824         free_irq(pdev->irq, mtd);
 825  out_free_dma:
 826         dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
 827  out_ior:
 828         pci_iounmap(pdev, cafe->mmio);
 829  out_free_mtd:
 830         kfree(mtd);
 831  out:
 832         return err;
 833 }
 834
 835 static void __devexit cafe_nand_remove(struct pci_dev *pdev)
 836 {
 837         struct mtd_info *mtd = pci_get_drvdata(pdev);
 838         struct cafe_priv *cafe = mtd->priv;
 839
 840         del_mtd_device(mtd);
 841         /* Disable NAND IRQ in global IRQ mask register */
 842         cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
 843         free_irq(pdev->irq, mtd);
 844         nand_release(mtd);
 845         free_rs(cafe->rs);
 846         pci_iounmap(pdev, cafe->mmio);
 847         dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
 848         kfree(mtd);
 849 }
 850
 851 static struct pci_device_id cafe_nand_tbl[] = {
 852         { PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_88ALP01_NAND,
 853           PCI_ANY_ID, PCI_ANY_ID },
 854         { }
 855 };
 856
 857 MODULE_DEVICE_TABLE(pci, cafe_nand_tbl);
 858
 859 static int cafe_nand_resume(struct pci_dev *pdev)
 860 {
 861         uint32_t ctrl;
 862         struct mtd_info *mtd = pci_get_drvdata(pdev);
 863         struct cafe_priv *cafe = mtd->priv;
 864
 865        /* Start off by resetting the NAND controller completely */
 866         cafe_writel(cafe, 1, NAND_RESET);
 867         cafe_writel(cafe, 0, NAND_RESET);
 868         cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
 869
 870         /* Restore timing configuration */
 871         cafe_writel(cafe, timing[0], NAND_TIMING1);
 872         cafe_writel(cafe, timing[1], NAND_TIMING2);
 873         cafe_writel(cafe, timing[2], NAND_TIMING3);
 874
 875         /* Disable master reset, enable NAND clock */
 876         ctrl = cafe_readl(cafe, GLOBAL_CTRL);
 877         ctrl &= 0xffffeff0;
 878         ctrl |= 0x00007000;
 879         cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
 880         cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
 881         cafe_writel(cafe, 0, NAND_DMA_CTRL);
 882         cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
 883         cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
 884
 885         /* Set up DMA address */
 886         cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
 887         if (sizeof(cafe->dmaaddr) > 4)
 888         /* Shift in two parts to shut the compiler up */
 889                 cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
 890         else
 891                 cafe_writel(cafe, 0, NAND_DMA_ADDR1);
 892
 893         /* Enable NAND IRQ in global IRQ mask register */
 894         cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
 895         return 0;
 896 }
 897
 898 static struct pci_driver cafe_nand_pci_driver = {
 899         .name = "CAFÉ NAND",
 900         .id_table = cafe_nand_tbl,
 901         .probe = cafe_nand_probe,
 902         .remove = __devexit_p(cafe_nand_remove),
 903         .resume = cafe_nand_resume,
 904 };
 905
 906 static int cafe_nand_init(void)
 907 {
 908         return pci_register_driver(&cafe_nand_pci_driver);
 909 }
 910
 911 static void cafe_nand_exit(void)
 912 {
 913         pci_unregister_driver(&cafe_nand_pci_driver);
 914 }
 915 module_init(cafe_nand_init);
 916 module_exit(cafe_nand_exit);
 917
 918 MODULE_LICENSE("GPL");
 919 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 920 MODULE_DESCRIPTION("NAND flash driver for OLPC CAFÉ chip");