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