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   1 /*
   2  * drivers/mtd/nand/pxa3xx_nand.c
   3  *
   4  * Copyright © 2005 Intel Corporation
   5  * Copyright © 2006 Marvell International Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/delay.h>
  17 #include <linux/clk.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/nand.h>
  20 #include <linux/mtd/partitions.h>
  21 #include <linux/io.h>
  22 #include <linux/irq.h>
  23
  24 #include <mach/dma.h>
  25 #include <mach/pxa-regs.h>
  26 #include <mach/pxa3xx_nand.h>
  27
  28 #define CHIP_DELAY_TIMEOUT      (2 * HZ/10)
  29
  30 /* registers and bit definitions */
  31 #define NDCR            (0x00) /* Control register */
  32 #define NDTR0CS0        (0x04) /* Timing Parameter 0 for CS0 */
  33 #define NDTR1CS0        (0x0C) /* Timing Parameter 1 for CS0 */
  34 #define NDSR            (0x14) /* Status Register */
  35 #define NDPCR           (0x18) /* Page Count Register */
  36 #define NDBDR0          (0x1C) /* Bad Block Register 0 */
  37 #define NDBDR1          (0x20) /* Bad Block Register 1 */
  38 #define NDDB            (0x40) /* Data Buffer */
  39 #define NDCB0           (0x48) /* Command Buffer0 */
  40 #define NDCB1           (0x4C) /* Command Buffer1 */
  41 #define NDCB2           (0x50) /* Command Buffer2 */
  42
  43 #define NDCR_SPARE_EN           (0x1 << 31)
  44 #define NDCR_ECC_EN             (0x1 << 30)
  45 #define NDCR_DMA_EN             (0x1 << 29)
  46 #define NDCR_ND_RUN             (0x1 << 28)
  47 #define NDCR_DWIDTH_C           (0x1 << 27)
  48 #define NDCR_DWIDTH_M           (0x1 << 26)
  49 #define NDCR_PAGE_SZ            (0x1 << 24)
  50 #define NDCR_NCSX               (0x1 << 23)
  51 #define NDCR_ND_MODE            (0x3 << 21)
  52 #define NDCR_NAND_MODE          (0x0)
  53 #define NDCR_CLR_PG_CNT         (0x1 << 20)
  54 #define NDCR_CLR_ECC            (0x1 << 19)
  55 #define NDCR_RD_ID_CNT_MASK     (0x7 << 16)
  56 #define NDCR_RD_ID_CNT(x)       (((x) << 16) & NDCR_RD_ID_CNT_MASK)
  57
  58 #define NDCR_RA_START           (0x1 << 15)
  59 #define NDCR_PG_PER_BLK         (0x1 << 14)
  60 #define NDCR_ND_ARB_EN          (0x1 << 12)
  61
  62 #define NDSR_MASK               (0xfff)
  63 #define NDSR_RDY                (0x1 << 11)
  64 #define NDSR_CS0_PAGED          (0x1 << 10)
  65 #define NDSR_CS1_PAGED          (0x1 << 9)
  66 #define NDSR_CS0_CMDD           (0x1 << 8)
  67 #define NDSR_CS1_CMDD           (0x1 << 7)
  68 #define NDSR_CS0_BBD            (0x1 << 6)
  69 #define NDSR_CS1_BBD            (0x1 << 5)
  70 #define NDSR_DBERR              (0x1 << 4)
  71 #define NDSR_SBERR              (0x1 << 3)
  72 #define NDSR_WRDREQ             (0x1 << 2)
  73 #define NDSR_RDDREQ             (0x1 << 1)
  74 #define NDSR_WRCMDREQ           (0x1)
  75
  76 #define NDCB0_AUTO_RS           (0x1 << 25)
  77 #define NDCB0_CSEL              (0x1 << 24)
  78 #define NDCB0_CMD_TYPE_MASK     (0x7 << 21)
  79 #define NDCB0_CMD_TYPE(x)       (((x) << 21) & NDCB0_CMD_TYPE_MASK)
  80 #define NDCB0_NC                (0x1 << 20)
  81 #define NDCB0_DBC               (0x1 << 19)
  82 #define NDCB0_ADDR_CYC_MASK     (0x7 << 16)
  83 #define NDCB0_ADDR_CYC(x)       (((x) << 16) & NDCB0_ADDR_CYC_MASK)
  84 #define NDCB0_CMD2_MASK         (0xff << 8)
  85 #define NDCB0_CMD1_MASK         (0xff)
  86 #define NDCB0_ADDR_CYC_SHIFT    (16)
  87
  88 /* dma-able I/O address for the NAND data and commands */
  89 #define NDCB0_DMA_ADDR          (0x43100048)
  90 #define NDDB_DMA_ADDR           (0x43100040)
  91
  92 /* macros for registers read/write */
  93 #define nand_writel(info, off, val)     \
  94         __raw_writel((val), (info)->mmio_base + (off))
  95
  96 #define nand_readl(info, off)           \
  97         __raw_readl((info)->mmio_base + (off))
  98
  99 /* error code and state */
 100 enum {
 101         ERR_NONE        = 0,
 102         ERR_DMABUSERR   = -1,
 103         ERR_SENDCMD     = -2,
 104         ERR_DBERR       = -3,
 105         ERR_BBERR       = -4,
 106 };
 107
 108 enum {
 109         STATE_READY     = 0,
 110         STATE_CMD_HANDLE,
 111         STATE_DMA_READING,
 112         STATE_DMA_WRITING,
 113         STATE_DMA_DONE,
 114         STATE_PIO_READING,
 115         STATE_PIO_WRITING,
 116 };
 117
 118 struct pxa3xx_nand_info {
 119         struct nand_chip        nand_chip;
 120
 121         struct platform_device   *pdev;
 122         const struct pxa3xx_nand_flash *flash_info;
 123
 124         struct clk              *clk;
 125         void __iomem            *mmio_base;
 126
 127         unsigned int            buf_start;
 128         unsigned int            buf_count;
 129
 130         /* DMA information */
 131         int                     drcmr_dat;
 132         int                     drcmr_cmd;
 133
 134         unsigned char           *data_buff;
 135         dma_addr_t              data_buff_phys;
 136         size_t                  data_buff_size;
 137         int                     data_dma_ch;
 138         struct pxa_dma_desc     *data_desc;
 139         dma_addr_t              data_desc_addr;
 140
 141         uint32_t                reg_ndcr;
 142
 143         /* saved column/page_addr during CMD_SEQIN */
 144         int                     seqin_column;
 145         int                     seqin_page_addr;
 146
 147         /* relate to the command */
 148         unsigned int            state;
 149
 150         int                     use_ecc;        /* use HW ECC ? */
 151         int                     use_dma;        /* use DMA ? */
 152
 153         size_t                  data_size;      /* data size in FIFO */
 154         int                     retcode;
 155         struct completion       cmd_complete;
 156
 157         /* generated NDCBx register values */
 158         uint32_t                ndcb0;
 159         uint32_t                ndcb1;
 160         uint32_t                ndcb2;
 161
 162         /* calculated from pxa3xx_nand_flash data */
 163         size_t          oob_size;
 164         size_t          read_id_bytes;
 165
 166         unsigned int    col_addr_cycles;
 167         unsigned int    row_addr_cycles;
 168 };
 169
 170 static int use_dma = 1;
 171 module_param(use_dma, bool, 0444);
 172 MODULE_PARM_DESC(use_dma, "enable DMA for data transfering to/from NAND HW");
 173
 174 #ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
 175 static struct pxa3xx_nand_cmdset smallpage_cmdset = {
 176         .read1          = 0x0000,
 177         .read2          = 0x0050,
 178         .program        = 0x1080,
 179         .read_status    = 0x0070,
 180         .read_id        = 0x0090,
 181         .erase          = 0xD060,
 182         .reset          = 0x00FF,
 183         .lock           = 0x002A,
 184         .unlock         = 0x2423,
 185         .lock_status    = 0x007A,
 186 };
 187
 188 static struct pxa3xx_nand_cmdset largepage_cmdset = {
 189         .read1          = 0x3000,
 190         .read2          = 0x0050,
 191         .program        = 0x1080,
 192         .read_status    = 0x0070,
 193         .read_id        = 0x0090,
 194         .erase          = 0xD060,
 195         .reset          = 0x00FF,
 196         .lock           = 0x002A,
 197         .unlock         = 0x2423,
 198         .lock_status    = 0x007A,
 199 };
 200
 201 static struct pxa3xx_nand_timing samsung512MbX16_timing = {
 202         .tCH    = 10,
 203         .tCS    = 0,
 204         .tWH    = 20,
 205         .tWP    = 40,
 206         .tRH    = 30,
 207         .tRP    = 40,
 208         .tR     = 11123,
 209         .tWHR   = 110,
 210         .tAR    = 10,
 211 };
 212
 213 static struct pxa3xx_nand_flash samsung512MbX16 = {
 214         .timing         = &samsung512MbX16_timing,
 215         .cmdset         = &smallpage_cmdset,
 216         .page_per_block = 32,
 217         .page_size      = 512,
 218         .flash_width    = 16,
 219         .dfc_width      = 16,
 220         .num_blocks     = 4096,
 221         .chip_id        = 0x46ec,
 222 };
 223
 224 static struct pxa3xx_nand_timing micron_timing = {
 225         .tCH    = 10,
 226         .tCS    = 25,
 227         .tWH    = 15,
 228         .tWP    = 25,
 229         .tRH    = 15,
 230         .tRP    = 25,
 231         .tR     = 25000,
 232         .tWHR   = 60,
 233         .tAR    = 10,
 234 };
 235
 236 static struct pxa3xx_nand_flash micron1GbX8 = {
 237         .timing         = &micron_timing,
 238         .cmdset         = &largepage_cmdset,
 239         .page_per_block = 64,
 240         .page_size      = 2048,
 241         .flash_width    = 8,
 242         .dfc_width      = 8,
 243         .num_blocks     = 1024,
 244         .chip_id        = 0xa12c,
 245 };
 246
 247 static struct pxa3xx_nand_flash micron1GbX16 = {
 248         .timing         = &micron_timing,
 249         .cmdset         = &largepage_cmdset,
 250         .page_per_block = 64,
 251         .page_size      = 2048,
 252         .flash_width    = 16,
 253         .dfc_width      = 16,
 254         .num_blocks     = 1024,
 255         .chip_id        = 0xb12c,
 256 };
 257
 258 static struct pxa3xx_nand_timing stm2GbX16_timing = {
 259         .tCH = 10,
 260         .tCS = 35,
 261         .tWH = 15,
 262         .tWP = 25,
 263         .tRH = 15,
 264         .tRP = 25,
 265         .tR = 25000,
 266         .tWHR = 60,
 267         .tAR = 10,
 268 };
 269
 270 static struct pxa3xx_nand_flash stm2GbX16 = {
 271         .timing = &stm2GbX16_timing,
 272         .cmdset = &largepage_cmdset,
 273         .page_per_block = 64,
 274         .page_size = 2048,
 275         .flash_width = 16,
 276         .dfc_width = 16,
 277         .num_blocks = 2048,
 278         .chip_id = 0xba20,
 279 };
 280
 281 static struct pxa3xx_nand_flash *builtin_flash_types[] = {
 282         &samsung512MbX16,
 283         &micron1GbX8,
 284         &micron1GbX16,
 285         &stm2GbX16,
 286 };
 287 #endif /* CONFIG_MTD_NAND_PXA3xx_BUILTIN */
 288
 289 #define NDTR0_tCH(c)    (min((c), 7) << 19)
 290 #define NDTR0_tCS(c)    (min((c), 7) << 16)
 291 #define NDTR0_tWH(c)    (min((c), 7) << 11)
 292 #define NDTR0_tWP(c)    (min((c), 7) << 8)
 293 #define NDTR0_tRH(c)    (min((c), 7) << 3)
 294 #define NDTR0_tRP(c)    (min((c), 7) << 0)
 295
 296 #define NDTR1_tR(c)     (min((c), 65535) << 16)
 297 #define NDTR1_tWHR(c)   (min((c), 15) << 4)
 298 #define NDTR1_tAR(c)    (min((c), 15) << 0)
 299
 300 /* convert nano-seconds to nand flash controller clock cycles */
 301 #define ns2cycle(ns, clk)       (int)(((ns) * (clk / 1000000) / 1000) - 1)
 302
 303 static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info,
 304                                    const struct pxa3xx_nand_timing *t)
 305 {
 306         unsigned long nand_clk = clk_get_rate(info->clk);
 307         uint32_t ndtr0, ndtr1;
 308
 309         ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) |
 310                 NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) |
 311                 NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) |
 312                 NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) |
 313                 NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) |
 314                 NDTR0_tRP(ns2cycle(t->tRP, nand_clk));
 315
 316         ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) |
 317                 NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) |
 318                 NDTR1_tAR(ns2cycle(t->tAR, nand_clk));
 319
 320         nand_writel(info, NDTR0CS0, ndtr0);
 321         nand_writel(info, NDTR1CS0, ndtr1);
 322 }
 323
 324 #define WAIT_EVENT_TIMEOUT      10
 325
 326 static int wait_for_event(struct pxa3xx_nand_info *info, uint32_t event)
 327 {
 328         int timeout = WAIT_EVENT_TIMEOUT;
 329         uint32_t ndsr;
 330
 331         while (timeout--) {
 332                 ndsr = nand_readl(info, NDSR) & NDSR_MASK;
 333                 if (ndsr & event) {
 334                         nand_writel(info, NDSR, ndsr);
 335                         return 0;
 336                 }
 337                 udelay(10);
 338         }
 339
 340         return -ETIMEDOUT;
 341 }
 342
 343 static int prepare_read_prog_cmd(struct pxa3xx_nand_info *info,
 344                         uint16_t cmd, int column, int page_addr)
 345 {
 346         const struct pxa3xx_nand_flash *f = info->flash_info;
 347         const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
 348
 349         /* calculate data size */
 350         switch (f->page_size) {
 351         case 2048:
 352                 info->data_size = (info->use_ecc) ? 2088 : 2112;
 353                 break;
 354         case 512:
 355                 info->data_size = (info->use_ecc) ? 520 : 528;
 356                 break;
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         /* generate values for NDCBx registers */
 362         info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
 363         info->ndcb1 = 0;
 364         info->ndcb2 = 0;
 365         info->ndcb0 |= NDCB0_ADDR_CYC(info->row_addr_cycles + info->col_addr_cycles);
 366
 367         if (info->col_addr_cycles == 2) {
 368                 /* large block, 2 cycles for column address
 369                  * row address starts from 3rd cycle
 370                  */
 371                 info->ndcb1 |= page_addr << 16;
 372                 if (info->row_addr_cycles == 3)
 373                         info->ndcb2 = (page_addr >> 16) & 0xff;
 374         } else
 375                 /* small block, 1 cycles for column address
 376                  * row address starts from 2nd cycle
 377                  */
 378                 info->ndcb1 = page_addr << 8;
 379
 380         if (cmd == cmdset->program)
 381                 info->ndcb0 |= NDCB0_CMD_TYPE(1) | NDCB0_AUTO_RS;
 382
 383         return 0;
 384 }
 385
 386 static int prepare_erase_cmd(struct pxa3xx_nand_info *info,
 387                         uint16_t cmd, int page_addr)
 388 {
 389         info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
 390         info->ndcb0 |= NDCB0_CMD_TYPE(2) | NDCB0_AUTO_RS | NDCB0_ADDR_CYC(3);
 391         info->ndcb1 = page_addr;
 392         info->ndcb2 = 0;
 393         return 0;
 394 }
 395
 396 static int prepare_other_cmd(struct pxa3xx_nand_info *info, uint16_t cmd)
 397 {
 398         const struct pxa3xx_nand_cmdset *cmdset = info->flash_info->cmdset;
 399
 400         info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
 401         info->ndcb1 = 0;
 402         info->ndcb2 = 0;
 403
 404         if (cmd == cmdset->read_id) {
 405                 info->ndcb0 |= NDCB0_CMD_TYPE(3);
 406                 info->data_size = 8;
 407         } else if (cmd == cmdset->read_status) {
 408                 info->ndcb0 |= NDCB0_CMD_TYPE(4);
 409                 info->data_size = 8;
 410         } else if (cmd == cmdset->reset || cmd == cmdset->lock ||
 411                    cmd == cmdset->unlock) {
 412                 info->ndcb0 |= NDCB0_CMD_TYPE(5);
 413         } else
 414                 return -EINVAL;
 415
 416         return 0;
 417 }
 418
 419 static void enable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
 420 {
 421         uint32_t ndcr;
 422
 423         ndcr = nand_readl(info, NDCR);
 424         nand_writel(info, NDCR, ndcr & ~int_mask);
 425 }
 426
 427 static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
 428 {
 429         uint32_t ndcr;
 430
 431         ndcr = nand_readl(info, NDCR);
 432         nand_writel(info, NDCR, ndcr | int_mask);
 433 }
 434
 435 /* NOTE: it is a must to set ND_RUN firstly, then write command buffer
 436  * otherwise, it does not work
 437  */
 438 static int write_cmd(struct pxa3xx_nand_info *info)
 439 {
 440         uint32_t ndcr;
 441
 442         /* clear status bits and run */
 443         nand_writel(info, NDSR, NDSR_MASK);
 444
 445         ndcr = info->reg_ndcr;
 446
 447         ndcr |= info->use_ecc ? NDCR_ECC_EN : 0;
 448         ndcr |= info->use_dma ? NDCR_DMA_EN : 0;
 449         ndcr |= NDCR_ND_RUN;
 450
 451         nand_writel(info, NDCR, ndcr);
 452
 453         if (wait_for_event(info, NDSR_WRCMDREQ)) {
 454                 printk(KERN_ERR "timed out writing command\n");
 455                 return -ETIMEDOUT;
 456         }
 457
 458         nand_writel(info, NDCB0, info->ndcb0);
 459         nand_writel(info, NDCB0, info->ndcb1);
 460         nand_writel(info, NDCB0, info->ndcb2);
 461         return 0;
 462 }
 463
 464 static int handle_data_pio(struct pxa3xx_nand_info *info)
 465 {
 466         int ret, timeout = CHIP_DELAY_TIMEOUT;
 467
 468         switch (info->state) {
 469         case STATE_PIO_WRITING:
 470                 __raw_writesl(info->mmio_base + NDDB, info->data_buff,
 471                                 info->data_size << 2);
 472
 473                 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 474
 475                 ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
 476                 if (!ret) {
 477                         printk(KERN_ERR "program command time out\n");
 478                         return -1;
 479                 }
 480                 break;
 481         case STATE_PIO_READING:
 482                 __raw_readsl(info->mmio_base + NDDB, info->data_buff,
 483                                 info->data_size << 2);
 484                 break;
 485         default:
 486                 printk(KERN_ERR "%s: invalid state %d\n", __func__,
 487                                 info->state);
 488                 return -EINVAL;
 489         }
 490
 491         info->state = STATE_READY;
 492         return 0;
 493 }
 494
 495 static void start_data_dma(struct pxa3xx_nand_info *info, int dir_out)
 496 {
 497         struct pxa_dma_desc *desc = info->data_desc;
 498         int dma_len = ALIGN(info->data_size, 32);
 499
 500         desc->ddadr = DDADR_STOP;
 501         desc->dcmd = DCMD_ENDIRQEN | DCMD_WIDTH4 | DCMD_BURST32 | dma_len;
 502
 503         if (dir_out) {
 504                 desc->dsadr = info->data_buff_phys;
 505                 desc->dtadr = NDDB_DMA_ADDR;
 506                 desc->dcmd |= DCMD_INCSRCADDR | DCMD_FLOWTRG;
 507         } else {
 508                 desc->dtadr = info->data_buff_phys;
 509                 desc->dsadr = NDDB_DMA_ADDR;
 510                 desc->dcmd |= DCMD_INCTRGADDR | DCMD_FLOWSRC;
 511         }
 512
 513         DRCMR(info->drcmr_dat) = DRCMR_MAPVLD | info->data_dma_ch;
 514         DDADR(info->data_dma_ch) = info->data_desc_addr;
 515         DCSR(info->data_dma_ch) |= DCSR_RUN;
 516 }
 517
 518 static void pxa3xx_nand_data_dma_irq(int channel, void *data)
 519 {
 520         struct pxa3xx_nand_info *info = data;
 521         uint32_t dcsr;
 522
 523         dcsr = DCSR(channel);
 524         DCSR(channel) = dcsr;
 525
 526         if (dcsr & DCSR_BUSERR) {
 527                 info->retcode = ERR_DMABUSERR;
 528                 complete(&info->cmd_complete);
 529         }
 530
 531         if (info->state == STATE_DMA_WRITING) {
 532                 info->state = STATE_DMA_DONE;
 533                 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 534         } else {
 535                 info->state = STATE_READY;
 536                 complete(&info->cmd_complete);
 537         }
 538 }
 539
 540 static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
 541 {
 542         struct pxa3xx_nand_info *info = devid;
 543         unsigned int status;
 544
 545         status = nand_readl(info, NDSR);
 546
 547         if (status & (NDSR_RDDREQ | NDSR_DBERR)) {
 548                 if (status & NDSR_DBERR)
 549                         info->retcode = ERR_DBERR;
 550
 551                 disable_int(info, NDSR_RDDREQ | NDSR_DBERR);
 552
 553                 if (info->use_dma) {
 554                         info->state = STATE_DMA_READING;
 555                         start_data_dma(info, 0);
 556                 } else {
 557                         info->state = STATE_PIO_READING;
 558                         complete(&info->cmd_complete);
 559                 }
 560         } else if (status & NDSR_WRDREQ) {
 561                 disable_int(info, NDSR_WRDREQ);
 562                 if (info->use_dma) {
 563                         info->state = STATE_DMA_WRITING;
 564                         start_data_dma(info, 1);
 565                 } else {
 566                         info->state = STATE_PIO_WRITING;
 567                         complete(&info->cmd_complete);
 568                 }
 569         } else if (status & (NDSR_CS0_BBD | NDSR_CS0_CMDD)) {
 570                 if (status & NDSR_CS0_BBD)
 571                         info->retcode = ERR_BBERR;
 572
 573                 disable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 574                 info->state = STATE_READY;
 575                 complete(&info->cmd_complete);
 576         }
 577         nand_writel(info, NDSR, status);
 578         return IRQ_HANDLED;
 579 }
 580
 581 static int pxa3xx_nand_do_cmd(struct pxa3xx_nand_info *info, uint32_t event)
 582 {
 583         uint32_t ndcr;
 584         int ret, timeout = CHIP_DELAY_TIMEOUT;
 585
 586         if (write_cmd(info)) {
 587                 info->retcode = ERR_SENDCMD;
 588                 goto fail_stop;
 589         }
 590
 591         info->state = STATE_CMD_HANDLE;
 592
 593         enable_int(info, event);
 594
 595         ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
 596         if (!ret) {
 597                 printk(KERN_ERR "command execution timed out\n");
 598                 info->retcode = ERR_SENDCMD;
 599                 goto fail_stop;
 600         }
 601
 602         if (info->use_dma == 0 && info->data_size > 0)
 603                 if (handle_data_pio(info))
 604                         goto fail_stop;
 605
 606         return 0;
 607
 608 fail_stop:
 609         ndcr = nand_readl(info, NDCR);
 610         nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
 611         udelay(10);
 612         return -ETIMEDOUT;
 613 }
 614
 615 static int pxa3xx_nand_dev_ready(struct mtd_info *mtd)
 616 {
 617         struct pxa3xx_nand_info *info = mtd->priv;
 618         return (nand_readl(info, NDSR) & NDSR_RDY) ? 1 : 0;
 619 }
 620
 621 static inline int is_buf_blank(uint8_t *buf, size_t len)
 622 {
 623         for (; len > 0; len--)
 624                 if (*buf++ != 0xff)
 625                         return 0;
 626         return 1;
 627 }
 628
 629 static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
 630                                 int column, int page_addr)
 631 {
 632         struct pxa3xx_nand_info *info = mtd->priv;
 633         const struct pxa3xx_nand_flash *flash_info = info->flash_info;
 634         const struct pxa3xx_nand_cmdset *cmdset = flash_info->cmdset;
 635         int ret;
 636
 637         info->use_dma = (use_dma) ? 1 : 0;
 638         info->use_ecc = 0;
 639         info->data_size = 0;
 640         info->state = STATE_READY;
 641
 642         init_completion(&info->cmd_complete);
 643
 644         switch (command) {
 645         case NAND_CMD_READOOB:
 646                 /* disable HW ECC to get all the OOB data */
 647                 info->buf_count = mtd->writesize + mtd->oobsize;
 648                 info->buf_start = mtd->writesize + column;
 649
 650                 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
 651                         break;
 652
 653                 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR);
 654
 655                 /* We only are OOB, so if the data has error, does not matter */
 656                 if (info->retcode == ERR_DBERR)
 657                         info->retcode = ERR_NONE;
 658                 break;
 659
 660         case NAND_CMD_READ0:
 661                 info->use_ecc = 1;
 662                 info->retcode = ERR_NONE;
 663                 info->buf_start = column;
 664                 info->buf_count = mtd->writesize + mtd->oobsize;
 665                 memset(info->data_buff, 0xFF, info->buf_count);
 666
 667                 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
 668                         break;
 669
 670                 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR);
 671
 672                 if (info->retcode == ERR_DBERR) {
 673                         /* for blank page (all 0xff), HW will calculate its ECC as
 674                          * 0, which is different from the ECC information within
 675                          * OOB, ignore such double bit errors
 676                          */
 677                         if (is_buf_blank(info->data_buff, mtd->writesize))
 678                                 info->retcode = ERR_NONE;
 679                 }
 680                 break;
 681         case NAND_CMD_SEQIN:
 682                 info->buf_start = column;
 683                 info->buf_count = mtd->writesize + mtd->oobsize;
 684                 memset(info->data_buff, 0xff, info->buf_count);
 685
 686                 /* save column/page_addr for next CMD_PAGEPROG */
 687                 info->seqin_column = column;
 688                 info->seqin_page_addr = page_addr;
 689                 break;
 690         case NAND_CMD_PAGEPROG:
 691                 info->use_ecc = (info->seqin_column >= mtd->writesize) ? 0 : 1;
 692
 693                 if (prepare_read_prog_cmd(info, cmdset->program,
 694                                 info->seqin_column, info->seqin_page_addr))
 695                         break;
 696
 697                 pxa3xx_nand_do_cmd(info, NDSR_WRDREQ);
 698                 break;
 699         case NAND_CMD_ERASE1:
 700                 if (prepare_erase_cmd(info, cmdset->erase, page_addr))
 701                         break;
 702
 703                 pxa3xx_nand_do_cmd(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 704                 break;
 705         case NAND_CMD_ERASE2:
 706                 break;
 707         case NAND_CMD_READID:
 708         case NAND_CMD_STATUS:
 709                 info->use_dma = 0;      /* force PIO read */
 710                 info->buf_start = 0;
 711                 info->buf_count = (command == NAND_CMD_READID) ?
 712                                 info->read_id_bytes : 1;
 713
 714                 if (prepare_other_cmd(info, (command == NAND_CMD_READID) ?
 715                                 cmdset->read_id : cmdset->read_status))
 716                         break;
 717
 718                 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ);
 719                 break;
 720         case NAND_CMD_RESET:
 721                 if (prepare_other_cmd(info, cmdset->reset))
 722                         break;
 723
 724                 ret = pxa3xx_nand_do_cmd(info, NDSR_CS0_CMDD);
 725                 if (ret == 0) {
 726                         int timeout = 2;
 727                         uint32_t ndcr;
 728
 729                         while (timeout--) {
 730                                 if (nand_readl(info, NDSR) & NDSR_RDY)
 731                                         break;
 732                                 msleep(10);
 733                         }
 734
 735                         ndcr = nand_readl(info, NDCR);
 736                         nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
 737                 }
 738                 break;
 739         default:
 740                 printk(KERN_ERR "non-supported command.\n");
 741                 break;
 742         }
 743
 744         if (info->retcode == ERR_DBERR) {
 745                 printk(KERN_ERR "double bit error @ page %08x\n", page_addr);
 746                 info->retcode = ERR_NONE;
 747         }
 748 }
 749
 750 static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
 751 {
 752         struct pxa3xx_nand_info *info = mtd->priv;
 753         char retval = 0xFF;
 754
 755         if (info->buf_start < info->buf_count)
 756                 /* Has just send a new command? */
 757                 retval = info->data_buff[info->buf_start++];
 758
 759         return retval;
 760 }
 761
 762 static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
 763 {
 764         struct pxa3xx_nand_info *info = mtd->priv;
 765         u16 retval = 0xFFFF;
 766
 767         if (!(info->buf_start & 0x01) && info->buf_start < info->buf_count) {
 768                 retval = *((u16 *)(info->data_buff+info->buf_start));
 769                 info->buf_start += 2;
 770         }
 771         return retval;
 772 }
 773
 774 static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 775 {
 776         struct pxa3xx_nand_info *info = mtd->priv;
 777         int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
 778
 779         memcpy(buf, info->data_buff + info->buf_start, real_len);
 780         info->buf_start += real_len;
 781 }
 782
 783 static void pxa3xx_nand_write_buf(struct mtd_info *mtd,
 784                 const uint8_t *buf, int len)
 785 {
 786         struct pxa3xx_nand_info *info = mtd->priv;
 787         int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
 788
 789         memcpy(info->data_buff + info->buf_start, buf, real_len);
 790         info->buf_start += real_len;
 791 }
 792
 793 static int pxa3xx_nand_verify_buf(struct mtd_info *mtd,
 794                 const uint8_t *buf, int len)
 795 {
 796         return 0;
 797 }
 798
 799 static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
 800 {
 801         return;
 802 }
 803
 804 static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
 805 {
 806         struct pxa3xx_nand_info *info = mtd->priv;
 807
 808         /* pxa3xx_nand_send_command has waited for command complete */
 809         if (this->state == FL_WRITING || this->state == FL_ERASING) {
 810                 if (info->retcode == ERR_NONE)
 811                         return 0;
 812                 else {
 813                         /*
 814                          * any error make it return 0x01 which will tell
 815                          * the caller the erase and write fail
 816                          */
 817                         return 0x01;
 818                 }
 819         }
 820
 821         return 0;
 822 }
 823
 824 static void pxa3xx_nand_ecc_hwctl(struct mtd_info *mtd, int mode)
 825 {
 826         return;
 827 }
 828
 829 static int pxa3xx_nand_ecc_calculate(struct mtd_info *mtd,
 830                 const uint8_t *dat, uint8_t *ecc_code)
 831 {
 832         return 0;
 833 }
 834
 835 static int pxa3xx_nand_ecc_correct(struct mtd_info *mtd,
 836                 uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc)
 837 {
 838         struct pxa3xx_nand_info *info = mtd->priv;
 839         /*
 840          * Any error include ERR_SEND_CMD, ERR_DBERR, ERR_BUSERR, we
 841          * consider it as a ecc error which will tell the caller the
 842          * read fail We have distinguish all the errors, but the
 843          * nand_read_ecc only check this function return value
 844          */
 845         if (info->retcode != ERR_NONE)
 846                 return -1;
 847
 848         return 0;
 849 }
 850
 851 static int __readid(struct pxa3xx_nand_info *info, uint32_t *id)
 852 {
 853         const struct pxa3xx_nand_flash *f = info->flash_info;
 854         const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
 855         uint32_t ndcr;
 856         uint8_t  id_buff[8];
 857
 858         if (prepare_other_cmd(info, cmdset->read_id)) {
 859                 printk(KERN_ERR "failed to prepare command\n");
 860                 return -EINVAL;
 861         }
 862
 863         /* Send command */
 864         if (write_cmd(info))
 865                 goto fail_timeout;
 866
 867         /* Wait for CMDDM(command done successfully) */
 868         if (wait_for_event(info, NDSR_RDDREQ))
 869                 goto fail_timeout;
 870
 871         __raw_readsl(info->mmio_base + NDDB, id_buff, 2);
 872         *id = id_buff[0] | (id_buff[1] << 8);
 873         return 0;
 874
 875 fail_timeout:
 876         ndcr = nand_readl(info, NDCR);
 877         nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
 878         udelay(10);
 879         return -ETIMEDOUT;
 880 }
 881
 882 static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
 883                                     const struct pxa3xx_nand_flash *f)
 884 {
 885         struct platform_device *pdev = info->pdev;
 886         struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
 887         uint32_t ndcr = 0x00000FFF; /* disable all interrupts */
 888
 889         if (f->page_size != 2048 && f->page_size != 512)
 890                 return -EINVAL;
 891
 892         if (f->flash_width != 16 && f->flash_width != 8)
 893                 return -EINVAL;
 894
 895         /* calculate flash information */
 896         info->oob_size = (f->page_size == 2048) ? 64 : 16;
 897         info->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
 898
 899         /* calculate addressing information */
 900         info->col_addr_cycles = (f->page_size == 2048) ? 2 : 1;
 901
 902         if (f->num_blocks * f->page_per_block > 65536)
 903                 info->row_addr_cycles = 3;
 904         else
 905                 info->row_addr_cycles = 2;
 906
 907         ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
 908         ndcr |= (info->col_addr_cycles == 2) ? NDCR_RA_START : 0;
 909         ndcr |= (f->page_per_block == 64) ? NDCR_PG_PER_BLK : 0;
 910         ndcr |= (f->page_size == 2048) ? NDCR_PAGE_SZ : 0;
 911         ndcr |= (f->flash_width == 16) ? NDCR_DWIDTH_M : 0;
 912         ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0;
 913
 914         ndcr |= NDCR_RD_ID_CNT(info->read_id_bytes);
 915         ndcr |= NDCR_SPARE_EN; /* enable spare by default */
 916
 917         info->reg_ndcr = ndcr;
 918
 919         pxa3xx_nand_set_timing(info, f->timing);
 920         info->flash_info = f;
 921         return 0;
 922 }
 923
 924 static int pxa3xx_nand_detect_flash(struct pxa3xx_nand_info *info,
 925                                     const struct pxa3xx_nand_platform_data *pdata)
 926 {
 927         const struct pxa3xx_nand_flash *f;
 928         uint32_t id = -1;
 929         int i;
 930
 931         for (i = 0; i<pdata->num_flash; ++i) {
 932                 f = pdata->flash + i;
 933
 934                 if (pxa3xx_nand_config_flash(info, f))
 935                         continue;
 936
 937                 if (__readid(info, &id))
 938                         continue;
 939
 940                 if (id == f->chip_id)
 941                         return 0;
 942         }
 943
 944 #ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
 945         for (i = 0; i < ARRAY_SIZE(builtin_flash_types); i++) {
 946
 947                 f = builtin_flash_types[i];
 948
 949                 if (pxa3xx_nand_config_flash(info, f))
 950                         continue;
 951
 952                 if (__readid(info, &id))
 953                         continue;
 954
 955                 if (id == f->chip_id)
 956                         return 0;
 957         }
 958 #endif
 959
 960         dev_warn(&info->pdev->dev,
 961                  "failed to detect configured nand flash; found %04x instead of\n",
 962                  id);
 963         return -ENODEV;
 964 }
 965
 966 /* the maximum possible buffer size for large page with OOB data
 967  * is: 2048 + 64 = 2112 bytes, allocate a page here for both the
 968  * data buffer and the DMA descriptor
 969  */
 970 #define MAX_BUFF_SIZE   PAGE_SIZE
 971
 972 static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
 973 {
 974         struct platform_device *pdev = info->pdev;
 975         int data_desc_offset = MAX_BUFF_SIZE - sizeof(struct pxa_dma_desc);
 976
 977         if (use_dma == 0) {
 978                 info->data_buff = kmalloc(MAX_BUFF_SIZE, GFP_KERNEL);
 979                 if (info->data_buff == NULL)
 980                         return -ENOMEM;
 981                 return 0;
 982         }
 983
 984         info->data_buff = dma_alloc_coherent(&pdev->dev, MAX_BUFF_SIZE,
 985                                 &info->data_buff_phys, GFP_KERNEL);
 986         if (info->data_buff == NULL) {
 987                 dev_err(&pdev->dev, "failed to allocate dma buffer\n");
 988                 return -ENOMEM;
 989         }
 990
 991         info->data_buff_size = MAX_BUFF_SIZE;
 992         info->data_desc = (void *)info->data_buff + data_desc_offset;
 993         info->data_desc_addr = info->data_buff_phys + data_desc_offset;
 994
 995         info->data_dma_ch = pxa_request_dma("nand-data", DMA_PRIO_LOW,
 996                                 pxa3xx_nand_data_dma_irq, info);
 997         if (info->data_dma_ch < 0) {
 998                 dev_err(&pdev->dev, "failed to request data dma\n");
 999                 dma_free_coherent(&pdev->dev, info->data_buff_size,
1000                                 info->data_buff, info->data_buff_phys);
1001                 return info->data_dma_ch;
1002         }
1003
1004         return 0;
1005 }
1006
1007 static struct nand_ecclayout hw_smallpage_ecclayout = {
1008         .eccbytes = 6,
1009         .eccpos = {8, 9, 10, 11, 12, 13 },
1010         .oobfree = { {2, 6} }
1011 };
1012
1013 static struct nand_ecclayout hw_largepage_ecclayout = {
1014         .eccbytes = 24,
1015         .eccpos = {
1016                 40, 41, 42, 43, 44, 45, 46, 47,
1017                 48, 49, 50, 51, 52, 53, 54, 55,
1018                 56, 57, 58, 59, 60, 61, 62, 63},
1019         .oobfree = { {2, 38} }
1020 };
1021
1022 static void pxa3xx_nand_init_mtd(struct mtd_info *mtd,
1023                                  struct pxa3xx_nand_info *info)
1024 {
1025         const struct pxa3xx_nand_flash *f = info->flash_info;
1026         struct nand_chip *this = &info->nand_chip;
1027
1028         this->options = (f->flash_width == 16) ? NAND_BUSWIDTH_16: 0;
1029
1030         this->waitfunc          = pxa3xx_nand_waitfunc;
1031         this->select_chip       = pxa3xx_nand_select_chip;
1032         this->dev_ready         = pxa3xx_nand_dev_ready;
1033         this->cmdfunc           = pxa3xx_nand_cmdfunc;
1034         this->read_word         = pxa3xx_nand_read_word;
1035         this->read_byte         = pxa3xx_nand_read_byte;
1036         this->read_buf          = pxa3xx_nand_read_buf;
1037         this->write_buf         = pxa3xx_nand_write_buf;
1038         this->verify_buf        = pxa3xx_nand_verify_buf;
1039
1040         this->ecc.mode          = NAND_ECC_HW;
1041         this->ecc.hwctl         = pxa3xx_nand_ecc_hwctl;
1042         this->ecc.calculate     = pxa3xx_nand_ecc_calculate;
1043         this->ecc.correct       = pxa3xx_nand_ecc_correct;
1044         this->ecc.size          = f->page_size;
1045
1046         if (f->page_size == 2048)
1047                 this->ecc.layout = &hw_largepage_ecclayout;
1048         else
1049                 this->ecc.layout = &hw_smallpage_ecclayout;
1050
1051         this->chip_delay = 25;
1052 }
1053
1054 static int pxa3xx_nand_probe(struct platform_device *pdev)
1055 {
1056         struct pxa3xx_nand_platform_data *pdata;
1057         struct pxa3xx_nand_info *info;
1058         struct nand_chip *this;
1059         struct mtd_info *mtd;
1060         struct resource *r;
1061         int ret = 0, irq;
1062
1063         pdata = pdev->dev.platform_data;
1064
1065         if (!pdata) {
1066                 dev_err(&pdev->dev, "no platform data defined\n");
1067                 return -ENODEV;
1068         }
1069
1070         mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct pxa3xx_nand_info),
1071                         GFP_KERNEL);
1072         if (!mtd) {
1073                 dev_err(&pdev->dev, "failed to allocate memory\n");
1074                 return -ENOMEM;
1075         }
1076
1077         info = (struct pxa3xx_nand_info *)(&mtd[1]);
1078         info->pdev = pdev;
1079
1080         this = &info->nand_chip;
1081         mtd->priv = info;
1082
1083         info->clk = clk_get(&pdev->dev, NULL);
1084         if (IS_ERR(info->clk)) {
1085                 dev_err(&pdev->dev, "failed to get nand clock\n");
1086                 ret = PTR_ERR(info->clk);
1087                 goto fail_free_mtd;
1088         }
1089         clk_enable(info->clk);
1090
1091         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1092         if (r == NULL) {
1093                 dev_err(&pdev->dev, "no resource defined for data DMA\n");
1094                 ret = -ENXIO;
1095                 goto fail_put_clk;
1096         }
1097         info->drcmr_dat = r->start;
1098
1099         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1100         if (r == NULL) {
1101                 dev_err(&pdev->dev, "no resource defined for command DMA\n");
1102                 ret = -ENXIO;
1103                 goto fail_put_clk;
1104         }
1105         info->drcmr_cmd = r->start;
1106
1107         irq = platform_get_irq(pdev, 0);
1108         if (irq < 0) {
1109                 dev_err(&pdev->dev, "no IRQ resource defined\n");
1110                 ret = -ENXIO;
1111                 goto fail_put_clk;
1112         }
1113
1114         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1115         if (r == NULL) {
1116                 dev_err(&pdev->dev, "no IO memory resource defined\n");
1117                 ret = -ENODEV;
1118                 goto fail_put_clk;
1119         }
1120
1121         r = request_mem_region(r->start, r->end - r->start + 1, pdev->name);
1122         if (r == NULL) {
1123                 dev_err(&pdev->dev, "failed to request memory resource\n");
1124                 ret = -EBUSY;
1125                 goto fail_put_clk;
1126         }
1127
1128         info->mmio_base = ioremap(r->start, r->end - r->start + 1);
1129         if (info->mmio_base == NULL) {
1130                 dev_err(&pdev->dev, "ioremap() failed\n");
1131                 ret = -ENODEV;
1132                 goto fail_free_res;
1133         }
1134
1135         ret = pxa3xx_nand_init_buff(info);
1136         if (ret)
1137                 goto fail_free_io;
1138
1139         ret = request_irq(IRQ_NAND, pxa3xx_nand_irq, IRQF_DISABLED,
1140                                 pdev->name, info);
1141         if (ret < 0) {
1142                 dev_err(&pdev->dev, "failed to request IRQ\n");
1143                 goto fail_free_buf;
1144         }
1145
1146         ret = pxa3xx_nand_detect_flash(info, pdata);
1147         if (ret) {
1148                 dev_err(&pdev->dev, "failed to detect flash\n");
1149                 ret = -ENODEV;
1150                 goto fail_free_irq;
1151         }
1152
1153         pxa3xx_nand_init_mtd(mtd, info);
1154
1155         platform_set_drvdata(pdev, mtd);
1156
1157         if (nand_scan(mtd, 1)) {
1158                 dev_err(&pdev->dev, "failed to scan nand\n");
1159                 ret = -ENXIO;
1160                 goto fail_free_irq;
1161         }
1162
1163         return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
1164
1165 fail_free_irq:
1166         free_irq(IRQ_NAND, info);
1167 fail_free_buf:
1168         if (use_dma) {
1169                 pxa_free_dma(info->data_dma_ch);
1170                 dma_free_coherent(&pdev->dev, info->data_buff_size,
1171                         info->data_buff, info->data_buff_phys);
1172         } else
1173                 kfree(info->data_buff);
1174 fail_free_io:
1175         iounmap(info->mmio_base);
1176 fail_free_res:
1177         release_mem_region(r->start, r->end - r->start + 1);
1178 fail_put_clk:
1179         clk_disable(info->clk);
1180         clk_put(info->clk);
1181 fail_free_mtd:
1182         kfree(mtd);
1183         return ret;
1184 }
1185
1186 static int pxa3xx_nand_remove(struct platform_device *pdev)
1187 {
1188         struct mtd_info *mtd = platform_get_drvdata(pdev);
1189         struct pxa3xx_nand_info *info = mtd->priv;
1190
1191         platform_set_drvdata(pdev, NULL);
1192
1193         del_mtd_device(mtd);
1194         del_mtd_partitions(mtd);
1195         free_irq(IRQ_NAND, info);
1196         if (use_dma) {
1197                 pxa_free_dma(info->data_dma_ch);
1198                 dma_free_writecombine(&pdev->dev, info->data_buff_size,
1199                                 info->data_buff, info->data_buff_phys);
1200         } else
1201                 kfree(info->data_buff);
1202         kfree(mtd);
1203         return 0;
1204 }
1205
1206 #ifdef CONFIG_PM
1207 static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
1208 {
1209         struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1210         struct pxa3xx_nand_info *info = mtd->priv;
1211
1212         if (info->state != STATE_READY) {
1213                 dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
1214                 return -EAGAIN;
1215         }
1216
1217         return 0;
1218 }
1219
1220 static int pxa3xx_nand_resume(struct platform_device *pdev)
1221 {
1222         struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1223         struct pxa3xx_nand_info *info = mtd->priv;
1224
1225         clk_enable(info->clk);
1226
1227         return pxa3xx_nand_config_flash(info, info->flash_info);
1228 }
1229 #else
1230 #define pxa3xx_nand_suspend     NULL
1231 #define pxa3xx_nand_resume      NULL
1232 #endif
1233
1234 static struct platform_driver pxa3xx_nand_driver = {
1235         .driver = {
1236                 .name   = "pxa3xx-nand",
1237         },
1238         .probe          = pxa3xx_nand_probe,
1239         .remove         = pxa3xx_nand_remove,
1240         .suspend        = pxa3xx_nand_suspend,
1241         .resume         = pxa3xx_nand_resume,
1242 };
1243
1244 static int __init pxa3xx_nand_init(void)
1245 {
1246         return platform_driver_register(&pxa3xx_nand_driver);
1247 }
1248 module_init(pxa3xx_nand_init);
1249
1250 static void __exit pxa3xx_nand_exit(void)
1251 {
1252         platform_driver_unregister(&pxa3xx_nand_driver);
1253 }
1254 module_exit(pxa3xx_nand_exit);
1255
1256 MODULE_LICENSE("GPL");
1257 MODULE_DESCRIPTION("PXA3xx NAND controller driver");