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   1 /* linux/drivers/mtd/nand/bf5xx_nand.c
   2  *
   3  * Copyright 2006-2007 Analog Devices Inc.
   4  *      http://blackfin.uclinux.org/
   5  *      Bryan Wu <bryan.wu@analog.com>
   6  *
   7  * Blackfin BF5xx on-chip NAND flash controler driver
   8  *
   9  * Derived from drivers/mtd/nand/s3c2410.c
  10  * Copyright (c) 2007 Ben Dooks <ben@simtec.co.uk>
  11  *
  12  * Derived from drivers/mtd/nand/cafe.c
  13  * Copyright © 2006 Red Hat, Inc.
  14  * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
  15  *
  16  * Changelog:
  17  *      12-Jun-2007  Bryan Wu:  Initial version
  18  *      18-Jul-2007  Bryan Wu:
  19  *              - ECC_HW and ECC_SW supported
  20  *              - DMA supported in ECC_HW
  21  *              - YAFFS tested as rootfs in both ECC_HW and ECC_SW
  22  *
  23  * TODO:
  24  *      Enable JFFS2 over NAND as rootfs
  25  *
  26  * This program is free software; you can redistribute it and/or modify
  27  * it under the terms of the GNU General Public License as published by
  28  * the Free Software Foundation; either version 2 of the License, or
  29  * (at your option) any later version.
  30  *
  31  * This program is distributed in the hope that it will be useful,
  32  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  33  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  34  * GNU General Public License for more details.
  35  *
  36  * You should have received a copy of the GNU General Public License
  37  * along with this program; if not, write to the Free Software
  38  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  39 */
  40
  41 #include <linux/module.h>
  42 #include <linux/types.h>
  43 #include <linux/init.h>
  44 #include <linux/kernel.h>
  45 #include <linux/string.h>
  46 #include <linux/ioport.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/delay.h>
  49 #include <linux/dma-mapping.h>
  50 #include <linux/err.h>
  51 #include <linux/slab.h>
  52 #include <linux/io.h>
  53 #include <linux/bitops.h>
  54
  55 #include <linux/mtd/mtd.h>
  56 #include <linux/mtd/nand.h>
  57 #include <linux/mtd/nand_ecc.h>
  58 #include <linux/mtd/partitions.h>
  59
  60 #include <asm/blackfin.h>
  61 #include <asm/dma.h>
  62 #include <asm/cacheflush.h>
  63 #include <asm/nand.h>
  64 #include <asm/portmux.h>
  65
  66 #define DRV_NAME        "bf5xx-nand"
  67 #define DRV_VERSION     "1.2"
  68 #define DRV_AUTHOR      "Bryan Wu <bryan.wu@analog.com>"
  69 #define DRV_DESC        "BF5xx on-chip NAND FLash Controller Driver"
  70
  71 #ifdef CONFIG_MTD_NAND_BF5XX_HWECC
  72 static int hardware_ecc = 1;
  73 #else
  74 static int hardware_ecc;
  75 #endif
  76
  77 static unsigned short bfin_nfc_pin_req[] = {P_NAND_CE, P_NAND_RB, 0};
  78
  79 /*
  80  * Data structures for bf5xx nand flash controller driver
  81  */
  82
  83 /* bf5xx nand info */
  84 struct bf5xx_nand_info {
  85         /* mtd info */
  86         struct nand_hw_control          controller;
  87         struct mtd_info                 mtd;
  88         struct nand_chip                chip;
  89
  90         /* platform info */
  91         struct bf5xx_nand_platform      *platform;
  92
  93         /* device info */
  94         struct device                   *device;
  95
  96         /* DMA stuff */
  97         struct completion               dma_completion;
  98 };
  99
 100 /*
 101  * Conversion functions
 102  */
 103 static struct bf5xx_nand_info *mtd_to_nand_info(struct mtd_info *mtd)
 104 {
 105         return container_of(mtd, struct bf5xx_nand_info, mtd);
 106 }
 107
 108 static struct bf5xx_nand_info *to_nand_info(struct platform_device *pdev)
 109 {
 110         return platform_get_drvdata(pdev);
 111 }
 112
 113 static struct bf5xx_nand_platform *to_nand_plat(struct platform_device *pdev)
 114 {
 115         return pdev->dev.platform_data;
 116 }
 117
 118 /*
 119  * struct nand_chip interface function pointers
 120  */
 121
 122 /*
 123  * bf5xx_nand_hwcontrol
 124  *
 125  * Issue command and address cycles to the chip
 126  */
 127 static void bf5xx_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 128                                    unsigned int ctrl)
 129 {
 130         if (cmd == NAND_CMD_NONE)
 131                 return;
 132
 133         while (bfin_read_NFC_STAT() & WB_FULL)
 134                 cpu_relax();
 135
 136         if (ctrl & NAND_CLE)
 137                 bfin_write_NFC_CMD(cmd);
 138         else
 139                 bfin_write_NFC_ADDR(cmd);
 140         SSYNC();
 141 }
 142
 143 /*
 144  * bf5xx_nand_devready()
 145  *
 146  * returns 0 if the nand is busy, 1 if it is ready
 147  */
 148 static int bf5xx_nand_devready(struct mtd_info *mtd)
 149 {
 150         unsigned short val = bfin_read_NFC_IRQSTAT();
 151
 152         if ((val & NBUSYIRQ) == NBUSYIRQ)
 153                 return 1;
 154         else
 155                 return 0;
 156 }
 157
 158 /*
 159  * ECC functions
 160  * These allow the bf5xx to use the controller's ECC
 161  * generator block to ECC the data as it passes through
 162  */
 163
 164 /*
 165  * ECC error correction function
 166  */
 167 static int bf5xx_nand_correct_data_256(struct mtd_info *mtd, u_char *dat,
 168                                         u_char *read_ecc, u_char *calc_ecc)
 169 {
 170         struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
 171         u32 syndrome[5];
 172         u32 calced, stored;
 173         int i;
 174         unsigned short failing_bit, failing_byte;
 175         u_char data;
 176
 177         calced = calc_ecc[0] | (calc_ecc[1] << 8) | (calc_ecc[2] << 16);
 178         stored = read_ecc[0] | (read_ecc[1] << 8) | (read_ecc[2] << 16);
 179
 180         syndrome[0] = (calced ^ stored);
 181
 182         /*
 183          * syndrome 0: all zero
 184          * No error in data
 185          * No action
 186          */
 187         if (!syndrome[0] || !calced || !stored)
 188                 return 0;
 189
 190         /*
 191          * sysdrome 0: only one bit is one
 192          * ECC data was incorrect
 193          * No action
 194          */
 195         if (hweight32(syndrome[0]) == 1) {
 196                 dev_err(info->device, "ECC data was incorrect!\n");
 197                 return 1;
 198         }
 199
 200         syndrome[1] = (calced & 0x7FF) ^ (stored & 0x7FF);
 201         syndrome[2] = (calced & 0x7FF) ^ ((calced >> 11) & 0x7FF);
 202         syndrome[3] = (stored & 0x7FF) ^ ((stored >> 11) & 0x7FF);
 203         syndrome[4] = syndrome[2] ^ syndrome[3];
 204
 205         for (i = 0; i < 5; i++)
 206                 dev_info(info->device, "syndrome[%d] 0x%08x\n", i, syndrome[i]);
 207
 208         dev_info(info->device,
 209                 "calced[0x%08x], stored[0x%08x]\n",
 210                 calced, stored);
 211
 212         /*
 213          * sysdrome 0: exactly 11 bits are one, each parity
 214          * and parity' pair is 1 & 0 or 0 & 1.
 215          * 1-bit correctable error
 216          * Correct the error
 217          */
 218         if (hweight32(syndrome[0]) == 11 && syndrome[4] == 0x7FF) {
 219                 dev_info(info->device,
 220                         "1-bit correctable error, correct it.\n");
 221                 dev_info(info->device,
 222                         "syndrome[1] 0x%08x\n", syndrome[1]);
 223
 224                 failing_bit = syndrome[1] & 0x7;
 225                 failing_byte = syndrome[1] >> 0x3;
 226                 data = *(dat + failing_byte);
 227                 data = data ^ (0x1 << failing_bit);
 228                 *(dat + failing_byte) = data;
 229
 230                 return 0;
 231         }
 232
 233         /*
 234          * sysdrome 0: random data
 235          * More than 1-bit error, non-correctable error
 236          * Discard data, mark bad block
 237          */
 238         dev_err(info->device,
 239                 "More than 1-bit error, non-correctable error.\n");
 240         dev_err(info->device,
 241                 "Please discard data, mark bad block\n");
 242
 243         return 1;
 244 }
 245
 246 static int bf5xx_nand_correct_data(struct mtd_info *mtd, u_char *dat,
 247                                         u_char *read_ecc, u_char *calc_ecc)
 248 {
 249         struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
 250         struct bf5xx_nand_platform *plat = info->platform;
 251         unsigned short page_size = (plat->page_size ? 512 : 256);
 252         int ret;
 253
 254         ret = bf5xx_nand_correct_data_256(mtd, dat, read_ecc, calc_ecc);
 255
 256         /* If page size is 512, correct second 256 bytes */
 257         if (page_size == 512) {
 258                 dat += 256;
 259                 read_ecc += 8;
 260                 calc_ecc += 8;
 261                 ret = bf5xx_nand_correct_data_256(mtd, dat, read_ecc, calc_ecc);
 262         }
 263
 264         return ret;
 265 }
 266
 267 static void bf5xx_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 268 {
 269         return;
 270 }
 271
 272 static int bf5xx_nand_calculate_ecc(struct mtd_info *mtd,
 273                 const u_char *dat, u_char *ecc_code)
 274 {
 275         struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
 276         struct bf5xx_nand_platform *plat = info->platform;
 277         u16 page_size = (plat->page_size ? 512 : 256);
 278         u16 ecc0, ecc1;
 279         u32 code[2];
 280         u8 *p;
 281         int bytes = 3, i;
 282
 283         /* first 4 bytes ECC code for 256 page size */
 284         ecc0 = bfin_read_NFC_ECC0();
 285         ecc1 = bfin_read_NFC_ECC1();
 286
 287         code[0] = (ecc0 & 0x3FF) | ((ecc1 & 0x3FF) << 11);
 288
 289         dev_dbg(info->device, "returning ecc 0x%08x\n", code[0]);
 290
 291         /* second 4 bytes ECC code for 512 page size */
 292         if (page_size == 512) {
 293                 ecc0 = bfin_read_NFC_ECC2();
 294                 ecc1 = bfin_read_NFC_ECC3();
 295                 code[1] = (ecc0 & 0x3FF) | ((ecc1 & 0x3FF) << 11);
 296                 bytes = 6;
 297                 dev_dbg(info->device, "returning ecc 0x%08x\n", code[1]);
 298         }
 299
 300         p = (u8 *)code;
 301         for (i = 0; i < bytes; i++)
 302                 ecc_code[i] = p[i];
 303
 304         return 0;
 305 }
 306
 307 /*
 308  * PIO mode for buffer writing and reading
 309  */
 310 static void bf5xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 311 {
 312         int i;
 313         unsigned short val;
 314
 315         /*
 316          * Data reads are requested by first writing to NFC_DATA_RD
 317          * and then reading back from NFC_READ.
 318          */
 319         for (i = 0; i < len; i++) {
 320                 while (bfin_read_NFC_STAT() & WB_FULL)
 321                         cpu_relax();
 322
 323                 /* Contents do not matter */
 324                 bfin_write_NFC_DATA_RD(0x0000);
 325                 SSYNC();
 326
 327                 while ((bfin_read_NFC_IRQSTAT() & RD_RDY) != RD_RDY)
 328                         cpu_relax();
 329
 330                 buf[i] = bfin_read_NFC_READ();
 331
 332                 val = bfin_read_NFC_IRQSTAT();
 333                 val |= RD_RDY;
 334                 bfin_write_NFC_IRQSTAT(val);
 335                 SSYNC();
 336         }
 337 }
 338
 339 static uint8_t bf5xx_nand_read_byte(struct mtd_info *mtd)
 340 {
 341         uint8_t val;
 342
 343         bf5xx_nand_read_buf(mtd, &val, 1);
 344
 345         return val;
 346 }
 347
 348 static void bf5xx_nand_write_buf(struct mtd_info *mtd,
 349                                 const uint8_t *buf, int len)
 350 {
 351         int i;
 352
 353         for (i = 0; i < len; i++) {
 354                 while (bfin_read_NFC_STAT() & WB_FULL)
 355                         cpu_relax();
 356
 357                 bfin_write_NFC_DATA_WR(buf[i]);
 358                 SSYNC();
 359         }
 360 }
 361
 362 static void bf5xx_nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
 363 {
 364         int i;
 365         u16 *p = (u16 *) buf;
 366         len >>= 1;
 367
 368         /*
 369          * Data reads are requested by first writing to NFC_DATA_RD
 370          * and then reading back from NFC_READ.
 371          */
 372         bfin_write_NFC_DATA_RD(0x5555);
 373
 374         SSYNC();
 375
 376         for (i = 0; i < len; i++)
 377                 p[i] = bfin_read_NFC_READ();
 378 }
 379
 380 static void bf5xx_nand_write_buf16(struct mtd_info *mtd,
 381                                 const uint8_t *buf, int len)
 382 {
 383         int i;
 384         u16 *p = (u16 *) buf;
 385         len >>= 1;
 386
 387         for (i = 0; i < len; i++)
 388                 bfin_write_NFC_DATA_WR(p[i]);
 389
 390         SSYNC();
 391 }
 392
 393 /*
 394  * DMA functions for buffer writing and reading
 395  */
 396 static irqreturn_t bf5xx_nand_dma_irq(int irq, void *dev_id)
 397 {
 398         struct bf5xx_nand_info *info = dev_id;
 399
 400         clear_dma_irqstat(CH_NFC);
 401         disable_dma(CH_NFC);
 402         complete(&info->dma_completion);
 403
 404         return IRQ_HANDLED;
 405 }
 406
 407 static int bf5xx_nand_dma_rw(struct mtd_info *mtd,
 408                                 uint8_t *buf, int is_read)
 409 {
 410         struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
 411         struct bf5xx_nand_platform *plat = info->platform;
 412         unsigned short page_size = (plat->page_size ? 512 : 256);
 413         unsigned short val;
 414
 415         dev_dbg(info->device, " mtd->%p, buf->%p, is_read %d\n",
 416                         mtd, buf, is_read);
 417
 418         /*
 419          * Before starting a dma transfer, be sure to invalidate/flush
 420          * the cache over the address range of your DMA buffer to
 421          * prevent cache coherency problems. Otherwise very subtle bugs
 422          * can be introduced to your driver.
 423          */
 424         if (is_read)
 425                 invalidate_dcache_range((unsigned int)buf,
 426                                 (unsigned int)(buf + page_size));
 427         else
 428                 flush_dcache_range((unsigned int)buf,
 429                                 (unsigned int)(buf + page_size));
 430
 431         /*
 432          * This register must be written before each page is
 433          * transferred to generate the correct ECC register
 434          * values.
 435          */
 436         bfin_write_NFC_RST(0x1);
 437         SSYNC();
 438
 439         disable_dma(CH_NFC);
 440         clear_dma_irqstat(CH_NFC);
 441
 442         /* setup DMA register with Blackfin DMA API */
 443         set_dma_config(CH_NFC, 0x0);
 444         set_dma_start_addr(CH_NFC, (unsigned long) buf);
 445         set_dma_x_count(CH_NFC, (page_size >> 2));
 446         set_dma_x_modify(CH_NFC, 4);
 447
 448         /* setup write or read operation */
 449         val = DI_EN | WDSIZE_32;
 450         if (is_read)
 451                 val |= WNR;
 452         set_dma_config(CH_NFC, val);
 453         enable_dma(CH_NFC);
 454
 455         /* Start PAGE read/write operation */
 456         if (is_read)
 457                 bfin_write_NFC_PGCTL(0x1);
 458         else
 459                 bfin_write_NFC_PGCTL(0x2);
 460         wait_for_completion(&info->dma_completion);
 461
 462         return 0;
 463 }
 464
 465 static void bf5xx_nand_dma_read_buf(struct mtd_info *mtd,
 466                                         uint8_t *buf, int len)
 467 {
 468         struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
 469         struct bf5xx_nand_platform *plat = info->platform;
 470         unsigned short page_size = (plat->page_size ? 512 : 256);
 471
 472         dev_dbg(info->device, "mtd->%p, buf->%p, int %d\n", mtd, buf, len);
 473
 474         if (len == page_size)
 475                 bf5xx_nand_dma_rw(mtd, buf, 1);
 476         else
 477                 bf5xx_nand_read_buf(mtd, buf, len);
 478 }
 479
 480 static void bf5xx_nand_dma_write_buf(struct mtd_info *mtd,
 481                                 const uint8_t *buf, int len)
 482 {
 483         struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
 484         struct bf5xx_nand_platform *plat = info->platform;
 485         unsigned short page_size = (plat->page_size ? 512 : 256);
 486
 487         dev_dbg(info->device, "mtd->%p, buf->%p, len %d\n", mtd, buf, len);
 488
 489         if (len == page_size)
 490                 bf5xx_nand_dma_rw(mtd, (uint8_t *)buf, 0);
 491         else
 492                 bf5xx_nand_write_buf(mtd, buf, len);
 493 }
 494
 495 /*
 496  * System initialization functions
 497  */
 498
 499 static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
 500 {
 501         int ret;
 502         unsigned short val;
 503
 504         /* Do not use dma */
 505         if (!hardware_ecc)
 506                 return 0;
 507
 508         init_completion(&info->dma_completion);
 509
 510         /* Setup DMAC1 channel mux for NFC which shared with SDH */
 511         val = bfin_read_DMAC1_PERIMUX();
 512         val &= 0xFFFE;
 513         bfin_write_DMAC1_PERIMUX(val);
 514         SSYNC();
 515
 516         /* Request NFC DMA channel */
 517         ret = request_dma(CH_NFC, "BF5XX NFC driver");
 518         if (ret < 0) {
 519                 dev_err(info->device, " unable to get DMA channel\n");
 520                 return ret;
 521         }
 522
 523         set_dma_callback(CH_NFC, (void *) bf5xx_nand_dma_irq, (void *) info);
 524
 525         /* Turn off the DMA channel first */
 526         disable_dma(CH_NFC);
 527         return 0;
 528 }
 529
 530 /*
 531  * BF5XX NFC hardware initialization
 532  *  - pin mux setup
 533  *  - clear interrupt status
 534  */
 535 static int bf5xx_nand_hw_init(struct bf5xx_nand_info *info)
 536 {
 537         int err = 0;
 538         unsigned short val;
 539         struct bf5xx_nand_platform *plat = info->platform;
 540
 541         /* setup NFC_CTL register */
 542         dev_info(info->device,
 543                 "page_size=%d, data_width=%d, wr_dly=%d, rd_dly=%d\n",
 544                 (plat->page_size ? 512 : 256),
 545                 (plat->data_width ? 16 : 8),
 546                 plat->wr_dly, plat->rd_dly);
 547
 548         val = (plat->page_size << NFC_PG_SIZE_OFFSET) |
 549                 (plat->data_width << NFC_NWIDTH_OFFSET) |
 550                 (plat->rd_dly << NFC_RDDLY_OFFSET) |
 551                 (plat->rd_dly << NFC_WRDLY_OFFSET);
 552         dev_dbg(info->device, "NFC_CTL is 0x%04x\n", val);
 553
 554         bfin_write_NFC_CTL(val);
 555         SSYNC();
 556
 557         /* clear interrupt status */
 558         bfin_write_NFC_IRQMASK(0x0);
 559         SSYNC();
 560         val = bfin_read_NFC_IRQSTAT();
 561         bfin_write_NFC_IRQSTAT(val);
 562         SSYNC();
 563
 564         if (peripheral_request_list(bfin_nfc_pin_req, DRV_NAME)) {
 565                 printk(KERN_ERR DRV_NAME
 566                 ": Requesting Peripherals failed\n");
 567                 return -EFAULT;
 568         }
 569
 570         /* DMA initialization  */
 571         if (bf5xx_nand_dma_init(info))
 572                 err = -ENXIO;
 573
 574         return err;
 575 }
 576
 577 /*
 578  * Device management interface
 579  */
 580 static int bf5xx_nand_add_partition(struct bf5xx_nand_info *info)
 581 {
 582         struct mtd_info *mtd = &info->mtd;
 583
 584 #ifdef CONFIG_MTD_PARTITIONS
 585         struct mtd_partition *parts = info->platform->partitions;
 586         int nr = info->platform->nr_partitions;
 587
 588         return add_mtd_partitions(mtd, parts, nr);
 589 #else
 590         return add_mtd_device(mtd);
 591 #endif
 592 }
 593
 594 static int bf5xx_nand_remove(struct platform_device *pdev)
 595 {
 596         struct bf5xx_nand_info *info = to_nand_info(pdev);
 597         struct mtd_info *mtd = NULL;
 598
 599         platform_set_drvdata(pdev, NULL);
 600
 601         /* first thing we need to do is release all our mtds
 602          * and their partitions, then go through freeing the
 603          * resources used
 604          */
 605         mtd = &info->mtd;
 606         if (mtd) {
 607                 nand_release(mtd);
 608                 kfree(mtd);
 609         }
 610
 611         peripheral_free_list(bfin_nfc_pin_req);
 612
 613         /* free the common resources */
 614         kfree(info);
 615
 616         return 0;
 617 }
 618
 619 /*
 620  * bf5xx_nand_probe
 621  *
 622  * called by device layer when it finds a device matching
 623  * one our driver can handled. This code checks to see if
 624  * it can allocate all necessary resources then calls the
 625  * nand layer to look for devices
 626  */
 627 static int bf5xx_nand_probe(struct platform_device *pdev)
 628 {
 629         struct bf5xx_nand_platform *plat = to_nand_plat(pdev);
 630         struct bf5xx_nand_info *info = NULL;
 631         struct nand_chip *chip = NULL;
 632         struct mtd_info *mtd = NULL;
 633         int err = 0;
 634
 635         dev_dbg(&pdev->dev, "(%p)\n", pdev);
 636
 637         if (!plat) {
 638                 dev_err(&pdev->dev, "no platform specific information\n");
 639                 goto exit_error;
 640         }
 641
 642         info = kzalloc(sizeof(*info), GFP_KERNEL);
 643         if (info == NULL) {
 644                 dev_err(&pdev->dev, "no memory for flash info\n");
 645                 err = -ENOMEM;
 646                 goto exit_error;
 647         }
 648
 649         platform_set_drvdata(pdev, info);
 650
 651         spin_lock_init(&info->controller.lock);
 652         init_waitqueue_head(&info->controller.wq);
 653
 654         info->device     = &pdev->dev;
 655         info->platform   = plat;
 656
 657         /* initialise chip data struct */
 658         chip = &info->chip;
 659
 660         if (plat->data_width)
 661                 chip->options |= NAND_BUSWIDTH_16;
 662
 663         chip->options |= NAND_CACHEPRG | NAND_SKIP_BBTSCAN;
 664
 665         chip->read_buf = (plat->data_width) ?
 666                 bf5xx_nand_read_buf16 : bf5xx_nand_read_buf;
 667         chip->write_buf = (plat->data_width) ?
 668                 bf5xx_nand_write_buf16 : bf5xx_nand_write_buf;
 669
 670         chip->read_byte    = bf5xx_nand_read_byte;
 671
 672         chip->cmd_ctrl     = bf5xx_nand_hwcontrol;
 673         chip->dev_ready    = bf5xx_nand_devready;
 674
 675         chip->priv         = &info->mtd;
 676         chip->controller   = &info->controller;
 677
 678         chip->IO_ADDR_R    = (void __iomem *) NFC_READ;
 679         chip->IO_ADDR_W    = (void __iomem *) NFC_DATA_WR;
 680
 681         chip->chip_delay   = 0;
 682
 683         /* initialise mtd info data struct */
 684         mtd             = &info->mtd;
 685         mtd->priv       = chip;
 686         mtd->owner      = THIS_MODULE;
 687
 688         /* initialise the hardware */
 689         err = bf5xx_nand_hw_init(info);
 690         if (err != 0)
 691                 goto exit_error;
 692
 693         /* setup hardware ECC data struct */
 694         if (hardware_ecc) {
 695                 if (plat->page_size == NFC_PG_SIZE_256) {
 696                         chip->ecc.bytes = 3;
 697                         chip->ecc.size = 256;
 698                 } else if (plat->page_size == NFC_PG_SIZE_512) {
 699                         chip->ecc.bytes = 6;
 700                         chip->ecc.size = 512;
 701                 }
 702
 703                 chip->read_buf      = bf5xx_nand_dma_read_buf;
 704                 chip->write_buf     = bf5xx_nand_dma_write_buf;
 705                 chip->ecc.calculate = bf5xx_nand_calculate_ecc;
 706                 chip->ecc.correct   = bf5xx_nand_correct_data;
 707                 chip->ecc.mode      = NAND_ECC_HW;
 708                 chip->ecc.hwctl     = bf5xx_nand_enable_hwecc;
 709         } else {
 710                 chip->ecc.mode      = NAND_ECC_SOFT;
 711         }
 712
 713         /* scan hardware nand chip and setup mtd info data struct */
 714         if (nand_scan(mtd, 1)) {
 715                 err = -ENXIO;
 716                 goto exit_error;
 717         }
 718
 719         /* add NAND partition */
 720         bf5xx_nand_add_partition(info);
 721
 722         dev_dbg(&pdev->dev, "initialised ok\n");
 723         return 0;
 724
 725 exit_error:
 726         bf5xx_nand_remove(pdev);
 727
 728         if (err == 0)
 729                 err = -EINVAL;
 730         return err;
 731 }
 732
 733 /* PM Support */
 734 #ifdef CONFIG_PM
 735
 736 static int bf5xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
 737 {
 738         struct bf5xx_nand_info *info = platform_get_drvdata(dev);
 739
 740         return 0;
 741 }
 742
 743 static int bf5xx_nand_resume(struct platform_device *dev)
 744 {
 745         struct bf5xx_nand_info *info = platform_get_drvdata(dev);
 746
 747         if (info)
 748                 bf5xx_nand_hw_init(info);
 749
 750         return 0;
 751 }
 752
 753 #else
 754 #define bf5xx_nand_suspend NULL
 755 #define bf5xx_nand_resume NULL
 756 #endif
 757
 758 /* driver device registration */
 759 static struct platform_driver bf5xx_nand_driver = {
 760         .probe          = bf5xx_nand_probe,
 761         .remove         = bf5xx_nand_remove,
 762         .suspend        = bf5xx_nand_suspend,
 763         .resume         = bf5xx_nand_resume,
 764         .driver         = {
 765                 .name   = DRV_NAME,
 766                 .owner  = THIS_MODULE,
 767         },
 768 };
 769
 770 static int __init bf5xx_nand_init(void)
 771 {
 772         printk(KERN_INFO "%s, Version %s (c) 2007 Analog Devices, Inc.\n",
 773                 DRV_DESC, DRV_VERSION);
 774
 775         return platform_driver_register(&bf5xx_nand_driver);
 776 }
 777
 778 static void __exit bf5xx_nand_exit(void)
 779 {
 780         platform_driver_unregister(&bf5xx_nand_driver);
 781 }
 782
 783 module_init(bf5xx_nand_init);
 784 module_exit(bf5xx_nand_exit);
 785
 786 MODULE_LICENSE("GPL");
 787 MODULE_AUTHOR(DRV_AUTHOR);
 788 MODULE_DESCRIPTION(DRV_DESC);