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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/pxa3xx_nand.h>
  26
  27 #define CHIP_DELAY_TIMEOUT      (2 * HZ/10)
  28
  29 /* registers and bit definitions */
  30 #define NDCR            (0x00) /* Control register */
  31 #define NDTR0CS0        (0x04) /* Timing Parameter 0 for CS0 */
  32 #define NDTR1CS0        (0x0C) /* Timing Parameter 1 for CS0 */
  33 #define NDSR            (0x14) /* Status Register */
  34 #define NDPCR           (0x18) /* Page Count Register */
  35 #define NDBDR0          (0x1C) /* Bad Block Register 0 */
  36 #define NDBDR1          (0x20) /* Bad Block Register 1 */
  37 #define NDDB            (0x40) /* Data Buffer */
  38 #define NDCB0           (0x48) /* Command Buffer0 */
  39 #define NDCB1           (0x4C) /* Command Buffer1 */
  40 #define NDCB2           (0x50) /* Command Buffer2 */
  41
  42 #define NDCR_SPARE_EN           (0x1 << 31)
  43 #define NDCR_ECC_EN             (0x1 << 30)
  44 #define NDCR_DMA_EN             (0x1 << 29)
  45 #define NDCR_ND_RUN             (0x1 << 28)
  46 #define NDCR_DWIDTH_C           (0x1 << 27)
  47 #define NDCR_DWIDTH_M           (0x1 << 26)
  48 #define NDCR_PAGE_SZ            (0x1 << 24)
  49 #define NDCR_NCSX               (0x1 << 23)
  50 #define NDCR_ND_MODE            (0x3 << 21)
  51 #define NDCR_NAND_MODE          (0x0)
  52 #define NDCR_CLR_PG_CNT         (0x1 << 20)
  53 #define NDCR_CLR_ECC            (0x1 << 19)
  54 #define NDCR_RD_ID_CNT_MASK     (0x7 << 16)
  55 #define NDCR_RD_ID_CNT(x)       (((x) << 16) & NDCR_RD_ID_CNT_MASK)
  56
  57 #define NDCR_RA_START           (0x1 << 15)
  58 #define NDCR_PG_PER_BLK         (0x1 << 14)
  59 #define NDCR_ND_ARB_EN          (0x1 << 12)
  60
  61 #define NDSR_MASK               (0xfff)
  62 #define NDSR_RDY                (0x1 << 11)
  63 #define NDSR_CS0_PAGED          (0x1 << 10)
  64 #define NDSR_CS1_PAGED          (0x1 << 9)
  65 #define NDSR_CS0_CMDD           (0x1 << 8)
  66 #define NDSR_CS1_CMDD           (0x1 << 7)
  67 #define NDSR_CS0_BBD            (0x1 << 6)
  68 #define NDSR_CS1_BBD            (0x1 << 5)
  69 #define NDSR_DBERR              (0x1 << 4)
  70 #define NDSR_SBERR              (0x1 << 3)
  71 #define NDSR_WRDREQ             (0x1 << 2)
  72 #define NDSR_RDDREQ             (0x1 << 1)
  73 #define NDSR_WRCMDREQ           (0x1)
  74
  75 #define NDCB0_AUTO_RS           (0x1 << 25)
  76 #define NDCB0_CSEL              (0x1 << 24)
  77 #define NDCB0_CMD_TYPE_MASK     (0x7 << 21)
  78 #define NDCB0_CMD_TYPE(x)       (((x) << 21) & NDCB0_CMD_TYPE_MASK)
  79 #define NDCB0_NC                (0x1 << 20)
  80 #define NDCB0_DBC               (0x1 << 19)
  81 #define NDCB0_ADDR_CYC_MASK     (0x7 << 16)
  82 #define NDCB0_ADDR_CYC(x)       (((x) << 16) & NDCB0_ADDR_CYC_MASK)
  83 #define NDCB0_CMD2_MASK         (0xff << 8)
  84 #define NDCB0_CMD1_MASK         (0xff)
  85 #define NDCB0_ADDR_CYC_SHIFT    (16)
  86
  87 /* dma-able I/O address for the NAND data and commands */
  88 #define NDCB0_DMA_ADDR          (0x43100048)
  89 #define NDDB_DMA_ADDR           (0x43100040)
  90
  91 /* macros for registers read/write */
  92 #define nand_writel(info, off, val)     \
  93         __raw_writel((val), (info)->mmio_base + (off))
  94
  95 #define nand_readl(info, off)           \
  96         __raw_readl((info)->mmio_base + (off))
  97
  98 /* error code and state */
  99 enum {
 100         ERR_NONE        = 0,
 101         ERR_DMABUSERR   = -1,
 102         ERR_SENDCMD     = -2,
 103         ERR_DBERR       = -3,
 104         ERR_BBERR       = -4,
 105 };
 106
 107 enum {
 108         STATE_READY     = 0,
 109         STATE_CMD_HANDLE,
 110         STATE_DMA_READING,
 111         STATE_DMA_WRITING,
 112         STATE_DMA_DONE,
 113         STATE_PIO_READING,
 114         STATE_PIO_WRITING,
 115 };
 116
 117 struct pxa3xx_nand_info {
 118         struct nand_chip        nand_chip;
 119
 120         struct platform_device   *pdev;
 121         const struct pxa3xx_nand_flash *flash_info;
 122
 123         struct clk              *clk;
 124         void __iomem            *mmio_base;
 125
 126         unsigned int            buf_start;
 127         unsigned int            buf_count;
 128
 129         /* DMA information */
 130         int                     drcmr_dat;
 131         int                     drcmr_cmd;
 132
 133         unsigned char           *data_buff;
 134         dma_addr_t              data_buff_phys;
 135         size_t                  data_buff_size;
 136         int                     data_dma_ch;
 137         struct pxa_dma_desc     *data_desc;
 138         dma_addr_t              data_desc_addr;
 139
 140         uint32_t                reg_ndcr;
 141
 142         /* saved column/page_addr during CMD_SEQIN */
 143         int                     seqin_column;
 144         int                     seqin_page_addr;
 145
 146         /* relate to the command */
 147         unsigned int            state;
 148
 149         int                     use_ecc;        /* use HW ECC ? */
 150         int                     use_dma;        /* use DMA ? */
 151
 152         size_t                  data_size;      /* data size in FIFO */
 153         int                     retcode;
 154         struct completion       cmd_complete;
 155
 156         /* generated NDCBx register values */
 157         uint32_t                ndcb0;
 158         uint32_t                ndcb1;
 159         uint32_t                ndcb2;
 160
 161         /* calculated from pxa3xx_nand_flash data */
 162         size_t          oob_size;
 163         size_t          read_id_bytes;
 164
 165         unsigned int    col_addr_cycles;
 166         unsigned int    row_addr_cycles;
 167 };
 168
 169 static int use_dma = 1;
 170 module_param(use_dma, bool, 0444);
 171 MODULE_PARM_DESC(use_dma, "enable DMA for data transfering to/from NAND HW");
 172
 173 /*
 174  * Default NAND flash controller configuration setup by the
 175  * bootloader. This configuration is used only when pdata->keep_config is set
 176  */
 177 static struct pxa3xx_nand_timing default_timing;
 178 static struct pxa3xx_nand_flash default_flash;
 179
 180 static struct pxa3xx_nand_cmdset smallpage_cmdset = {
 181         .read1          = 0x0000,
 182         .read2          = 0x0050,
 183         .program        = 0x1080,
 184         .read_status    = 0x0070,
 185         .read_id        = 0x0090,
 186         .erase          = 0xD060,
 187         .reset          = 0x00FF,
 188         .lock           = 0x002A,
 189         .unlock         = 0x2423,
 190         .lock_status    = 0x007A,
 191 };
 192
 193 static struct pxa3xx_nand_cmdset largepage_cmdset = {
 194         .read1          = 0x3000,
 195         .read2          = 0x0050,
 196         .program        = 0x1080,
 197         .read_status    = 0x0070,
 198         .read_id        = 0x0090,
 199         .erase          = 0xD060,
 200         .reset          = 0x00FF,
 201         .lock           = 0x002A,
 202         .unlock         = 0x2423,
 203         .lock_status    = 0x007A,
 204 };
 205
 206 #ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
 207 static struct pxa3xx_nand_timing samsung512MbX16_timing = {
 208         .tCH    = 10,
 209         .tCS    = 0,
 210         .tWH    = 20,
 211         .tWP    = 40,
 212         .tRH    = 30,
 213         .tRP    = 40,
 214         .tR     = 11123,
 215         .tWHR   = 110,
 216         .tAR    = 10,
 217 };
 218
 219 static struct pxa3xx_nand_flash samsung512MbX16 = {
 220         .timing         = &samsung512MbX16_timing,
 221         .cmdset         = &smallpage_cmdset,
 222         .page_per_block = 32,
 223         .page_size      = 512,
 224         .flash_width    = 16,
 225         .dfc_width      = 16,
 226         .num_blocks     = 4096,
 227         .chip_id        = 0x46ec,
 228 };
 229
 230 static struct pxa3xx_nand_timing micron_timing = {
 231         .tCH    = 10,
 232         .tCS    = 25,
 233         .tWH    = 15,
 234         .tWP    = 25,
 235         .tRH    = 15,
 236         .tRP    = 25,
 237         .tR     = 25000,
 238         .tWHR   = 60,
 239         .tAR    = 10,
 240 };
 241
 242 static struct pxa3xx_nand_flash micron1GbX8 = {
 243         .timing         = &micron_timing,
 244         .cmdset         = &largepage_cmdset,
 245         .page_per_block = 64,
 246         .page_size      = 2048,
 247         .flash_width    = 8,
 248         .dfc_width      = 8,
 249         .num_blocks     = 1024,
 250         .chip_id        = 0xa12c,
 251 };
 252
 253 static struct pxa3xx_nand_flash micron1GbX16 = {
 254         .timing         = &micron_timing,
 255         .cmdset         = &largepage_cmdset,
 256         .page_per_block = 64,
 257         .page_size      = 2048,
 258         .flash_width    = 16,
 259         .dfc_width      = 16,
 260         .num_blocks     = 1024,
 261         .chip_id        = 0xb12c,
 262 };
 263
 264 static struct pxa3xx_nand_timing stm2GbX16_timing = {
 265         .tCH = 10,
 266         .tCS = 35,
 267         .tWH = 15,
 268         .tWP = 25,
 269         .tRH = 15,
 270         .tRP = 25,
 271         .tR = 25000,
 272         .tWHR = 60,
 273         .tAR = 10,
 274 };
 275
 276 static struct pxa3xx_nand_flash stm2GbX16 = {
 277         .timing = &stm2GbX16_timing,
 278         .cmdset = &largepage_cmdset,
 279         .page_per_block = 64,
 280         .page_size = 2048,
 281         .flash_width = 16,
 282         .dfc_width = 16,
 283         .num_blocks = 2048,
 284         .chip_id = 0xba20,
 285 };
 286
 287 static struct pxa3xx_nand_flash *builtin_flash_types[] = {
 288         &samsung512MbX16,
 289         &micron1GbX8,
 290         &micron1GbX16,
 291         &stm2GbX16,
 292 };
 293 #endif /* CONFIG_MTD_NAND_PXA3xx_BUILTIN */
 294
 295 #define NDTR0_tCH(c)    (min((c), 7) << 19)
 296 #define NDTR0_tCS(c)    (min((c), 7) << 16)
 297 #define NDTR0_tWH(c)    (min((c), 7) << 11)
 298 #define NDTR0_tWP(c)    (min((c), 7) << 8)
 299 #define NDTR0_tRH(c)    (min((c), 7) << 3)
 300 #define NDTR0_tRP(c)    (min((c), 7) << 0)
 301
 302 #define NDTR1_tR(c)     (min((c), 65535) << 16)
 303 #define NDTR1_tWHR(c)   (min((c), 15) << 4)
 304 #define NDTR1_tAR(c)    (min((c), 15) << 0)
 305
 306 #define tCH_NDTR0(r)    (((r) >> 19) & 0x7)
 307 #define tCS_NDTR0(r)    (((r) >> 16) & 0x7)
 308 #define tWH_NDTR0(r)    (((r) >> 11) & 0x7)
 309 #define tWP_NDTR0(r)    (((r) >> 8) & 0x7)
 310 #define tRH_NDTR0(r)    (((r) >> 3) & 0x7)
 311 #define tRP_NDTR0(r)    (((r) >> 0) & 0x7)
 312
 313 #define tR_NDTR1(r)     (((r) >> 16) & 0xffff)
 314 #define tWHR_NDTR1(r)   (((r) >> 4) & 0xf)
 315 #define tAR_NDTR1(r)    (((r) >> 0) & 0xf)
 316
 317 /* convert nano-seconds to nand flash controller clock cycles */
 318 #define ns2cycle(ns, clk)       (int)(((ns) * (clk / 1000000) / 1000) - 1)
 319
 320 /* convert nand flash controller clock cycles to nano-seconds */
 321 #define cycle2ns(c, clk)        ((((c) + 1) * 1000000 + clk / 500) / (clk / 1000))
 322
 323 static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info,
 324                                    const struct pxa3xx_nand_timing *t)
 325 {
 326         unsigned long nand_clk = clk_get_rate(info->clk);
 327         uint32_t ndtr0, ndtr1;
 328
 329         ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) |
 330                 NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) |
 331                 NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) |
 332                 NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) |
 333                 NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) |
 334                 NDTR0_tRP(ns2cycle(t->tRP, nand_clk));
 335
 336         ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) |
 337                 NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) |
 338                 NDTR1_tAR(ns2cycle(t->tAR, nand_clk));
 339
 340         nand_writel(info, NDTR0CS0, ndtr0);
 341         nand_writel(info, NDTR1CS0, ndtr1);
 342 }
 343
 344 #define WAIT_EVENT_TIMEOUT      10
 345
 346 static int wait_for_event(struct pxa3xx_nand_info *info, uint32_t event)
 347 {
 348         int timeout = WAIT_EVENT_TIMEOUT;
 349         uint32_t ndsr;
 350
 351         while (timeout--) {
 352                 ndsr = nand_readl(info, NDSR) & NDSR_MASK;
 353                 if (ndsr & event) {
 354                         nand_writel(info, NDSR, ndsr);
 355                         return 0;
 356                 }
 357                 udelay(10);
 358         }
 359
 360         return -ETIMEDOUT;
 361 }
 362
 363 static int prepare_read_prog_cmd(struct pxa3xx_nand_info *info,
 364                         uint16_t cmd, int column, int page_addr)
 365 {
 366         const struct pxa3xx_nand_flash *f = info->flash_info;
 367         const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
 368
 369         /* calculate data size */
 370         switch (f->page_size) {
 371         case 2048:
 372                 info->data_size = (info->use_ecc) ? 2088 : 2112;
 373                 break;
 374         case 512:
 375                 info->data_size = (info->use_ecc) ? 520 : 528;
 376                 break;
 377         default:
 378                 return -EINVAL;
 379         }
 380
 381         /* generate values for NDCBx registers */
 382         info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
 383         info->ndcb1 = 0;
 384         info->ndcb2 = 0;
 385         info->ndcb0 |= NDCB0_ADDR_CYC(info->row_addr_cycles + info->col_addr_cycles);
 386
 387         if (info->col_addr_cycles == 2) {
 388                 /* large block, 2 cycles for column address
 389                  * row address starts from 3rd cycle
 390                  */
 391                 info->ndcb1 |= page_addr << 16;
 392                 if (info->row_addr_cycles == 3)
 393                         info->ndcb2 = (page_addr >> 16) & 0xff;
 394         } else
 395                 /* small block, 1 cycles for column address
 396                  * row address starts from 2nd cycle
 397                  */
 398                 info->ndcb1 = page_addr << 8;
 399
 400         if (cmd == cmdset->program)
 401                 info->ndcb0 |= NDCB0_CMD_TYPE(1) | NDCB0_AUTO_RS;
 402
 403         return 0;
 404 }
 405
 406 static int prepare_erase_cmd(struct pxa3xx_nand_info *info,
 407                         uint16_t cmd, int page_addr)
 408 {
 409         info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
 410         info->ndcb0 |= NDCB0_CMD_TYPE(2) | NDCB0_AUTO_RS | NDCB0_ADDR_CYC(3);
 411         info->ndcb1 = page_addr;
 412         info->ndcb2 = 0;
 413         return 0;
 414 }
 415
 416 static int prepare_other_cmd(struct pxa3xx_nand_info *info, uint16_t cmd)
 417 {
 418         const struct pxa3xx_nand_cmdset *cmdset = info->flash_info->cmdset;
 419
 420         info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
 421         info->ndcb1 = 0;
 422         info->ndcb2 = 0;
 423
 424         if (cmd == cmdset->read_id) {
 425                 info->ndcb0 |= NDCB0_CMD_TYPE(3);
 426                 info->data_size = 8;
 427         } else if (cmd == cmdset->read_status) {
 428                 info->ndcb0 |= NDCB0_CMD_TYPE(4);
 429                 info->data_size = 8;
 430         } else if (cmd == cmdset->reset || cmd == cmdset->lock ||
 431                    cmd == cmdset->unlock) {
 432                 info->ndcb0 |= NDCB0_CMD_TYPE(5);
 433         } else
 434                 return -EINVAL;
 435
 436         return 0;
 437 }
 438
 439 static void enable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
 440 {
 441         uint32_t ndcr;
 442
 443         ndcr = nand_readl(info, NDCR);
 444         nand_writel(info, NDCR, ndcr & ~int_mask);
 445 }
 446
 447 static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
 448 {
 449         uint32_t ndcr;
 450
 451         ndcr = nand_readl(info, NDCR);
 452         nand_writel(info, NDCR, ndcr | int_mask);
 453 }
 454
 455 /* NOTE: it is a must to set ND_RUN firstly, then write command buffer
 456  * otherwise, it does not work
 457  */
 458 static int write_cmd(struct pxa3xx_nand_info *info)
 459 {
 460         uint32_t ndcr;
 461
 462         /* clear status bits and run */
 463         nand_writel(info, NDSR, NDSR_MASK);
 464
 465         ndcr = info->reg_ndcr;
 466
 467         ndcr |= info->use_ecc ? NDCR_ECC_EN : 0;
 468         ndcr |= info->use_dma ? NDCR_DMA_EN : 0;
 469         ndcr |= NDCR_ND_RUN;
 470
 471         nand_writel(info, NDCR, ndcr);
 472
 473         if (wait_for_event(info, NDSR_WRCMDREQ)) {
 474                 printk(KERN_ERR "timed out writing command\n");
 475                 return -ETIMEDOUT;
 476         }
 477
 478         nand_writel(info, NDCB0, info->ndcb0);
 479         nand_writel(info, NDCB0, info->ndcb1);
 480         nand_writel(info, NDCB0, info->ndcb2);
 481         return 0;
 482 }
 483
 484 static int handle_data_pio(struct pxa3xx_nand_info *info)
 485 {
 486         int ret, timeout = CHIP_DELAY_TIMEOUT;
 487
 488         switch (info->state) {
 489         case STATE_PIO_WRITING:
 490                 __raw_writesl(info->mmio_base + NDDB, info->data_buff,
 491                                 info->data_size << 2);
 492
 493                 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 494
 495                 ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
 496                 if (!ret) {
 497                         printk(KERN_ERR "program command time out\n");
 498                         return -1;
 499                 }
 500                 break;
 501         case STATE_PIO_READING:
 502                 __raw_readsl(info->mmio_base + NDDB, info->data_buff,
 503                                 info->data_size << 2);
 504                 break;
 505         default:
 506                 printk(KERN_ERR "%s: invalid state %d\n", __func__,
 507                                 info->state);
 508                 return -EINVAL;
 509         }
 510
 511         info->state = STATE_READY;
 512         return 0;
 513 }
 514
 515 static void start_data_dma(struct pxa3xx_nand_info *info, int dir_out)
 516 {
 517         struct pxa_dma_desc *desc = info->data_desc;
 518         int dma_len = ALIGN(info->data_size, 32);
 519
 520         desc->ddadr = DDADR_STOP;
 521         desc->dcmd = DCMD_ENDIRQEN | DCMD_WIDTH4 | DCMD_BURST32 | dma_len;
 522
 523         if (dir_out) {
 524                 desc->dsadr = info->data_buff_phys;
 525                 desc->dtadr = NDDB_DMA_ADDR;
 526                 desc->dcmd |= DCMD_INCSRCADDR | DCMD_FLOWTRG;
 527         } else {
 528                 desc->dtadr = info->data_buff_phys;
 529                 desc->dsadr = NDDB_DMA_ADDR;
 530                 desc->dcmd |= DCMD_INCTRGADDR | DCMD_FLOWSRC;
 531         }
 532
 533         DRCMR(info->drcmr_dat) = DRCMR_MAPVLD | info->data_dma_ch;
 534         DDADR(info->data_dma_ch) = info->data_desc_addr;
 535         DCSR(info->data_dma_ch) |= DCSR_RUN;
 536 }
 537
 538 static void pxa3xx_nand_data_dma_irq(int channel, void *data)
 539 {
 540         struct pxa3xx_nand_info *info = data;
 541         uint32_t dcsr;
 542
 543         dcsr = DCSR(channel);
 544         DCSR(channel) = dcsr;
 545
 546         if (dcsr & DCSR_BUSERR) {
 547                 info->retcode = ERR_DMABUSERR;
 548                 complete(&info->cmd_complete);
 549         }
 550
 551         if (info->state == STATE_DMA_WRITING) {
 552                 info->state = STATE_DMA_DONE;
 553                 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 554         } else {
 555                 info->state = STATE_READY;
 556                 complete(&info->cmd_complete);
 557         }
 558 }
 559
 560 static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
 561 {
 562         struct pxa3xx_nand_info *info = devid;
 563         unsigned int status;
 564
 565         status = nand_readl(info, NDSR);
 566
 567         if (status & (NDSR_RDDREQ | NDSR_DBERR)) {
 568                 if (status & NDSR_DBERR)
 569                         info->retcode = ERR_DBERR;
 570
 571                 disable_int(info, NDSR_RDDREQ | NDSR_DBERR);
 572
 573                 if (info->use_dma) {
 574                         info->state = STATE_DMA_READING;
 575                         start_data_dma(info, 0);
 576                 } else {
 577                         info->state = STATE_PIO_READING;
 578                         complete(&info->cmd_complete);
 579                 }
 580         } else if (status & NDSR_WRDREQ) {
 581                 disable_int(info, NDSR_WRDREQ);
 582                 if (info->use_dma) {
 583                         info->state = STATE_DMA_WRITING;
 584                         start_data_dma(info, 1);
 585                 } else {
 586                         info->state = STATE_PIO_WRITING;
 587                         complete(&info->cmd_complete);
 588                 }
 589         } else if (status & (NDSR_CS0_BBD | NDSR_CS0_CMDD)) {
 590                 if (status & NDSR_CS0_BBD)
 591                         info->retcode = ERR_BBERR;
 592
 593                 disable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 594                 info->state = STATE_READY;
 595                 complete(&info->cmd_complete);
 596         }
 597         nand_writel(info, NDSR, status);
 598         return IRQ_HANDLED;
 599 }
 600
 601 static int pxa3xx_nand_do_cmd(struct pxa3xx_nand_info *info, uint32_t event)
 602 {
 603         uint32_t ndcr;
 604         int ret, timeout = CHIP_DELAY_TIMEOUT;
 605
 606         if (write_cmd(info)) {
 607                 info->retcode = ERR_SENDCMD;
 608                 goto fail_stop;
 609         }
 610
 611         info->state = STATE_CMD_HANDLE;
 612
 613         enable_int(info, event);
 614
 615         ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
 616         if (!ret) {
 617                 printk(KERN_ERR "command execution timed out\n");
 618                 info->retcode = ERR_SENDCMD;
 619                 goto fail_stop;
 620         }
 621
 622         if (info->use_dma == 0 && info->data_size > 0)
 623                 if (handle_data_pio(info))
 624                         goto fail_stop;
 625
 626         return 0;
 627
 628 fail_stop:
 629         ndcr = nand_readl(info, NDCR);
 630         nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
 631         udelay(10);
 632         return -ETIMEDOUT;
 633 }
 634
 635 static int pxa3xx_nand_dev_ready(struct mtd_info *mtd)
 636 {
 637         struct pxa3xx_nand_info *info = mtd->priv;
 638         return (nand_readl(info, NDSR) & NDSR_RDY) ? 1 : 0;
 639 }
 640
 641 static inline int is_buf_blank(uint8_t *buf, size_t len)
 642 {
 643         for (; len > 0; len--)
 644                 if (*buf++ != 0xff)
 645                         return 0;
 646         return 1;
 647 }
 648
 649 static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
 650                                 int column, int page_addr)
 651 {
 652         struct pxa3xx_nand_info *info = mtd->priv;
 653         const struct pxa3xx_nand_flash *flash_info = info->flash_info;
 654         const struct pxa3xx_nand_cmdset *cmdset = flash_info->cmdset;
 655         int ret;
 656
 657         info->use_dma = (use_dma) ? 1 : 0;
 658         info->use_ecc = 0;
 659         info->data_size = 0;
 660         info->state = STATE_READY;
 661
 662         init_completion(&info->cmd_complete);
 663
 664         switch (command) {
 665         case NAND_CMD_READOOB:
 666                 /* disable HW ECC to get all the OOB data */
 667                 info->buf_count = mtd->writesize + mtd->oobsize;
 668                 info->buf_start = mtd->writesize + column;
 669
 670                 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
 671                         break;
 672
 673                 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR);
 674
 675                 /* We only are OOB, so if the data has error, does not matter */
 676                 if (info->retcode == ERR_DBERR)
 677                         info->retcode = ERR_NONE;
 678                 break;
 679
 680         case NAND_CMD_READ0:
 681                 info->use_ecc = 1;
 682                 info->retcode = ERR_NONE;
 683                 info->buf_start = column;
 684                 info->buf_count = mtd->writesize + mtd->oobsize;
 685                 memset(info->data_buff, 0xFF, info->buf_count);
 686
 687                 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
 688                         break;
 689
 690                 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR);
 691
 692                 if (info->retcode == ERR_DBERR) {
 693                         /* for blank page (all 0xff), HW will calculate its ECC as
 694                          * 0, which is different from the ECC information within
 695                          * OOB, ignore such double bit errors
 696                          */
 697                         if (is_buf_blank(info->data_buff, mtd->writesize))
 698                                 info->retcode = ERR_NONE;
 699                 }
 700                 break;
 701         case NAND_CMD_SEQIN:
 702                 info->buf_start = column;
 703                 info->buf_count = mtd->writesize + mtd->oobsize;
 704                 memset(info->data_buff, 0xff, info->buf_count);
 705
 706                 /* save column/page_addr for next CMD_PAGEPROG */
 707                 info->seqin_column = column;
 708                 info->seqin_page_addr = page_addr;
 709                 break;
 710         case NAND_CMD_PAGEPROG:
 711                 info->use_ecc = (info->seqin_column >= mtd->writesize) ? 0 : 1;
 712
 713                 if (prepare_read_prog_cmd(info, cmdset->program,
 714                                 info->seqin_column, info->seqin_page_addr))
 715                         break;
 716
 717                 pxa3xx_nand_do_cmd(info, NDSR_WRDREQ);
 718                 break;
 719         case NAND_CMD_ERASE1:
 720                 if (prepare_erase_cmd(info, cmdset->erase, page_addr))
 721                         break;
 722
 723                 pxa3xx_nand_do_cmd(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
 724                 break;
 725         case NAND_CMD_ERASE2:
 726                 break;
 727         case NAND_CMD_READID:
 728         case NAND_CMD_STATUS:
 729                 info->use_dma = 0;      /* force PIO read */
 730                 info->buf_start = 0;
 731                 info->buf_count = (command == NAND_CMD_READID) ?
 732                                 info->read_id_bytes : 1;
 733
 734                 if (prepare_other_cmd(info, (command == NAND_CMD_READID) ?
 735                                 cmdset->read_id : cmdset->read_status))
 736                         break;
 737
 738                 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ);
 739                 break;
 740         case NAND_CMD_RESET:
 741                 if (prepare_other_cmd(info, cmdset->reset))
 742                         break;
 743
 744                 ret = pxa3xx_nand_do_cmd(info, NDSR_CS0_CMDD);
 745                 if (ret == 0) {
 746                         int timeout = 2;
 747                         uint32_t ndcr;
 748
 749                         while (timeout--) {
 750                                 if (nand_readl(info, NDSR) & NDSR_RDY)
 751                                         break;
 752                                 msleep(10);
 753                         }
 754
 755                         ndcr = nand_readl(info, NDCR);
 756                         nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
 757                 }
 758                 break;
 759         default:
 760                 printk(KERN_ERR "non-supported command.\n");
 761                 break;
 762         }
 763
 764         if (info->retcode == ERR_DBERR) {
 765                 printk(KERN_ERR "double bit error @ page %08x\n", page_addr);
 766                 info->retcode = ERR_NONE;
 767         }
 768 }
 769
 770 static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
 771 {
 772         struct pxa3xx_nand_info *info = mtd->priv;
 773         char retval = 0xFF;
 774
 775         if (info->buf_start < info->buf_count)
 776                 /* Has just send a new command? */
 777                 retval = info->data_buff[info->buf_start++];
 778
 779         return retval;
 780 }
 781
 782 static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
 783 {
 784         struct pxa3xx_nand_info *info = mtd->priv;
 785         u16 retval = 0xFFFF;
 786
 787         if (!(info->buf_start & 0x01) && info->buf_start < info->buf_count) {
 788                 retval = *((u16 *)(info->data_buff+info->buf_start));
 789                 info->buf_start += 2;
 790         }
 791         return retval;
 792 }
 793
 794 static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 795 {
 796         struct pxa3xx_nand_info *info = mtd->priv;
 797         int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
 798
 799         memcpy(buf, info->data_buff + info->buf_start, real_len);
 800         info->buf_start += real_len;
 801 }
 802
 803 static void pxa3xx_nand_write_buf(struct mtd_info *mtd,
 804                 const uint8_t *buf, int len)
 805 {
 806         struct pxa3xx_nand_info *info = mtd->priv;
 807         int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
 808
 809         memcpy(info->data_buff + info->buf_start, buf, real_len);
 810         info->buf_start += real_len;
 811 }
 812
 813 static int pxa3xx_nand_verify_buf(struct mtd_info *mtd,
 814                 const uint8_t *buf, int len)
 815 {
 816         return 0;
 817 }
 818
 819 static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
 820 {
 821         return;
 822 }
 823
 824 static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
 825 {
 826         struct pxa3xx_nand_info *info = mtd->priv;
 827
 828         /* pxa3xx_nand_send_command has waited for command complete */
 829         if (this->state == FL_WRITING || this->state == FL_ERASING) {
 830                 if (info->retcode == ERR_NONE)
 831                         return 0;
 832                 else {
 833                         /*
 834                          * any error make it return 0x01 which will tell
 835                          * the caller the erase and write fail
 836                          */
 837                         return 0x01;
 838                 }
 839         }
 840
 841         return 0;
 842 }
 843
 844 static void pxa3xx_nand_ecc_hwctl(struct mtd_info *mtd, int mode)
 845 {
 846         return;
 847 }
 848
 849 static int pxa3xx_nand_ecc_calculate(struct mtd_info *mtd,
 850                 const uint8_t *dat, uint8_t *ecc_code)
 851 {
 852         return 0;
 853 }
 854
 855 static int pxa3xx_nand_ecc_correct(struct mtd_info *mtd,
 856                 uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc)
 857 {
 858         struct pxa3xx_nand_info *info = mtd->priv;
 859         /*
 860          * Any error include ERR_SEND_CMD, ERR_DBERR, ERR_BUSERR, we
 861          * consider it as a ecc error which will tell the caller the
 862          * read fail We have distinguish all the errors, but the
 863          * nand_read_ecc only check this function return value
 864          */
 865         if (info->retcode != ERR_NONE)
 866                 return -1;
 867
 868         return 0;
 869 }
 870
 871 static int __readid(struct pxa3xx_nand_info *info, uint32_t *id)
 872 {
 873         const struct pxa3xx_nand_flash *f = info->flash_info;
 874         const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
 875         uint32_t ndcr;
 876         uint8_t  id_buff[8];
 877
 878         if (prepare_other_cmd(info, cmdset->read_id)) {
 879                 printk(KERN_ERR "failed to prepare command\n");
 880                 return -EINVAL;
 881         }
 882
 883         /* Send command */
 884         if (write_cmd(info))
 885                 goto fail_timeout;
 886
 887         /* Wait for CMDDM(command done successfully) */
 888         if (wait_for_event(info, NDSR_RDDREQ))
 889                 goto fail_timeout;
 890
 891         __raw_readsl(info->mmio_base + NDDB, id_buff, 2);
 892         *id = id_buff[0] | (id_buff[1] << 8);
 893         return 0;
 894
 895 fail_timeout:
 896         ndcr = nand_readl(info, NDCR);
 897         nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
 898         udelay(10);
 899         return -ETIMEDOUT;
 900 }
 901
 902 static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
 903                                     const struct pxa3xx_nand_flash *f)
 904 {
 905         struct platform_device *pdev = info->pdev;
 906         struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
 907         uint32_t ndcr = 0x00000FFF; /* disable all interrupts */
 908
 909         if (f->page_size != 2048 && f->page_size != 512)
 910                 return -EINVAL;
 911
 912         if (f->flash_width != 16 && f->flash_width != 8)
 913                 return -EINVAL;
 914
 915         /* calculate flash information */
 916         info->oob_size = (f->page_size == 2048) ? 64 : 16;
 917         info->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
 918
 919         /* calculate addressing information */
 920         info->col_addr_cycles = (f->page_size == 2048) ? 2 : 1;
 921
 922         if (f->num_blocks * f->page_per_block > 65536)
 923                 info->row_addr_cycles = 3;
 924         else
 925                 info->row_addr_cycles = 2;
 926
 927         ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
 928         ndcr |= (info->col_addr_cycles == 2) ? NDCR_RA_START : 0;
 929         ndcr |= (f->page_per_block == 64) ? NDCR_PG_PER_BLK : 0;
 930         ndcr |= (f->page_size == 2048) ? NDCR_PAGE_SZ : 0;
 931         ndcr |= (f->flash_width == 16) ? NDCR_DWIDTH_M : 0;
 932         ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0;
 933
 934         ndcr |= NDCR_RD_ID_CNT(info->read_id_bytes);
 935         ndcr |= NDCR_SPARE_EN; /* enable spare by default */
 936
 937         info->reg_ndcr = ndcr;
 938
 939         pxa3xx_nand_set_timing(info, f->timing);
 940         info->flash_info = f;
 941         return 0;
 942 }
 943
 944 static void pxa3xx_nand_detect_timing(struct pxa3xx_nand_info *info,
 945                                       struct pxa3xx_nand_timing *t)
 946 {
 947         unsigned long nand_clk = clk_get_rate(info->clk);
 948         uint32_t ndtr0 = nand_readl(info, NDTR0CS0);
 949         uint32_t ndtr1 = nand_readl(info, NDTR1CS0);
 950
 951         t->tCH = cycle2ns(tCH_NDTR0(ndtr0), nand_clk);
 952         t->tCS = cycle2ns(tCS_NDTR0(ndtr0), nand_clk);
 953         t->tWH = cycle2ns(tWH_NDTR0(ndtr0), nand_clk);
 954         t->tWP = cycle2ns(tWP_NDTR0(ndtr0), nand_clk);
 955         t->tRH = cycle2ns(tRH_NDTR0(ndtr0), nand_clk);
 956         t->tRP = cycle2ns(tRP_NDTR0(ndtr0), nand_clk);
 957
 958         t->tR = cycle2ns(tR_NDTR1(ndtr1), nand_clk);
 959         t->tWHR = cycle2ns(tWHR_NDTR1(ndtr1), nand_clk);
 960         t->tAR = cycle2ns(tAR_NDTR1(ndtr1), nand_clk);
 961 }
 962
 963 static int pxa3xx_nand_detect_config(struct pxa3xx_nand_info *info)
 964 {
 965         uint32_t ndcr = nand_readl(info, NDCR);
 966         struct nand_flash_dev *type = NULL;
 967         uint32_t id = -1;
 968         int i;
 969
 970         default_flash.page_per_block = ndcr & NDCR_PG_PER_BLK ? 64 : 32;
 971         default_flash.page_size = ndcr & NDCR_PAGE_SZ ? 2048 : 512;
 972         default_flash.flash_width = ndcr & NDCR_DWIDTH_M ? 16 : 8;
 973         default_flash.dfc_width = ndcr & NDCR_DWIDTH_C ? 16 : 8;
 974
 975         if (default_flash.page_size == 2048)
 976                 default_flash.cmdset = &largepage_cmdset;
 977         else
 978                 default_flash.cmdset = &smallpage_cmdset;
 979
 980         /* set info fields needed to __readid */
 981         info->flash_info = &default_flash;
 982         info->read_id_bytes = (default_flash.page_size == 2048) ? 4 : 2;
 983         info->reg_ndcr = ndcr;
 984
 985         if (__readid(info, &id))
 986                 return -ENODEV;
 987
 988         /* Lookup the flash id */
 989         id = (id >> 8) & 0xff;          /* device id is byte 2 */
 990         for (i = 0; nand_flash_ids[i].name != NULL; i++) {
 991                 if (id == nand_flash_ids[i].id) {
 992                         type =  &nand_flash_ids[i];
 993                         break;
 994                 }
 995         }
 996
 997         if (!type)
 998                 return -ENODEV;
 999
1000         /* fill the missing flash information */
1001         i = __ffs(default_flash.page_per_block * default_flash.page_size);
1002         default_flash.num_blocks = type->chipsize << (20 - i);
1003
1004         info->oob_size = (default_flash.page_size == 2048) ? 64 : 16;
1005
1006         /* calculate addressing information */
1007         info->col_addr_cycles = (default_flash.page_size == 2048) ? 2 : 1;
1008
1009         if (default_flash.num_blocks * default_flash.page_per_block > 65536)
1010                 info->row_addr_cycles = 3;
1011         else
1012                 info->row_addr_cycles = 2;
1013
1014         pxa3xx_nand_detect_timing(info, &default_timing);
1015         default_flash.timing = &default_timing;
1016
1017         return 0;
1018 }
1019
1020 static int pxa3xx_nand_detect_flash(struct pxa3xx_nand_info *info,
1021                                     const struct pxa3xx_nand_platform_data *pdata)
1022 {
1023         const struct pxa3xx_nand_flash *f;
1024         uint32_t id = -1;
1025         int i;
1026
1027         if (pdata->keep_config)
1028                 if (pxa3xx_nand_detect_config(info) == 0)
1029                         return 0;
1030
1031         for (i = 0; i<pdata->num_flash; ++i) {
1032                 f = pdata->flash + i;
1033
1034                 if (pxa3xx_nand_config_flash(info, f))
1035                         continue;
1036
1037                 if (__readid(info, &id))
1038                         continue;
1039
1040                 if (id == f->chip_id)
1041                         return 0;
1042         }
1043
1044 #ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
1045         for (i = 0; i < ARRAY_SIZE(builtin_flash_types); i++) {
1046
1047                 f = builtin_flash_types[i];
1048
1049                 if (pxa3xx_nand_config_flash(info, f))
1050                         continue;
1051
1052                 if (__readid(info, &id))
1053                         continue;
1054
1055                 if (id == f->chip_id)
1056                         return 0;
1057         }
1058 #endif
1059
1060         dev_warn(&info->pdev->dev,
1061                  "failed to detect configured nand flash; found %04x instead of\n",
1062                  id);
1063         return -ENODEV;
1064 }
1065
1066 /* the maximum possible buffer size for large page with OOB data
1067  * is: 2048 + 64 = 2112 bytes, allocate a page here for both the
1068  * data buffer and the DMA descriptor
1069  */
1070 #define MAX_BUFF_SIZE   PAGE_SIZE
1071
1072 static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
1073 {
1074         struct platform_device *pdev = info->pdev;
1075         int data_desc_offset = MAX_BUFF_SIZE - sizeof(struct pxa_dma_desc);
1076
1077         if (use_dma == 0) {
1078                 info->data_buff = kmalloc(MAX_BUFF_SIZE, GFP_KERNEL);
1079                 if (info->data_buff == NULL)
1080                         return -ENOMEM;
1081                 return 0;
1082         }
1083
1084         info->data_buff = dma_alloc_coherent(&pdev->dev, MAX_BUFF_SIZE,
1085                                 &info->data_buff_phys, GFP_KERNEL);
1086         if (info->data_buff == NULL) {
1087                 dev_err(&pdev->dev, "failed to allocate dma buffer\n");
1088                 return -ENOMEM;
1089         }
1090
1091         info->data_buff_size = MAX_BUFF_SIZE;
1092         info->data_desc = (void *)info->data_buff + data_desc_offset;
1093         info->data_desc_addr = info->data_buff_phys + data_desc_offset;
1094
1095         info->data_dma_ch = pxa_request_dma("nand-data", DMA_PRIO_LOW,
1096                                 pxa3xx_nand_data_dma_irq, info);
1097         if (info->data_dma_ch < 0) {
1098                 dev_err(&pdev->dev, "failed to request data dma\n");
1099                 dma_free_coherent(&pdev->dev, info->data_buff_size,
1100                                 info->data_buff, info->data_buff_phys);
1101                 return info->data_dma_ch;
1102         }
1103
1104         return 0;
1105 }
1106
1107 static struct nand_ecclayout hw_smallpage_ecclayout = {
1108         .eccbytes = 6,
1109         .eccpos = {8, 9, 10, 11, 12, 13 },
1110         .oobfree = { {2, 6} }
1111 };
1112
1113 static struct nand_ecclayout hw_largepage_ecclayout = {
1114         .eccbytes = 24,
1115         .eccpos = {
1116                 40, 41, 42, 43, 44, 45, 46, 47,
1117                 48, 49, 50, 51, 52, 53, 54, 55,
1118                 56, 57, 58, 59, 60, 61, 62, 63},
1119         .oobfree = { {2, 38} }
1120 };
1121
1122 static void pxa3xx_nand_init_mtd(struct mtd_info *mtd,
1123                                  struct pxa3xx_nand_info *info)
1124 {
1125         const struct pxa3xx_nand_flash *f = info->flash_info;
1126         struct nand_chip *this = &info->nand_chip;
1127
1128         this->options = (f->flash_width == 16) ? NAND_BUSWIDTH_16: 0;
1129
1130         this->waitfunc          = pxa3xx_nand_waitfunc;
1131         this->select_chip       = pxa3xx_nand_select_chip;
1132         this->dev_ready         = pxa3xx_nand_dev_ready;
1133         this->cmdfunc           = pxa3xx_nand_cmdfunc;
1134         this->read_word         = pxa3xx_nand_read_word;
1135         this->read_byte         = pxa3xx_nand_read_byte;
1136         this->read_buf          = pxa3xx_nand_read_buf;
1137         this->write_buf         = pxa3xx_nand_write_buf;
1138         this->verify_buf        = pxa3xx_nand_verify_buf;
1139
1140         this->ecc.mode          = NAND_ECC_HW;
1141         this->ecc.hwctl         = pxa3xx_nand_ecc_hwctl;
1142         this->ecc.calculate     = pxa3xx_nand_ecc_calculate;
1143         this->ecc.correct       = pxa3xx_nand_ecc_correct;
1144         this->ecc.size          = f->page_size;
1145
1146         if (f->page_size == 2048)
1147                 this->ecc.layout = &hw_largepage_ecclayout;
1148         else
1149                 this->ecc.layout = &hw_smallpage_ecclayout;
1150
1151         this->chip_delay = 25;
1152 }
1153
1154 static int pxa3xx_nand_probe(struct platform_device *pdev)
1155 {
1156         struct pxa3xx_nand_platform_data *pdata;
1157         struct pxa3xx_nand_info *info;
1158         struct nand_chip *this;
1159         struct mtd_info *mtd;
1160         struct resource *r;
1161         int ret = 0, irq;
1162
1163         pdata = pdev->dev.platform_data;
1164
1165         if (!pdata) {
1166                 dev_err(&pdev->dev, "no platform data defined\n");
1167                 return -ENODEV;
1168         }
1169
1170         mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct pxa3xx_nand_info),
1171                         GFP_KERNEL);
1172         if (!mtd) {
1173                 dev_err(&pdev->dev, "failed to allocate memory\n");
1174                 return -ENOMEM;
1175         }
1176
1177         info = (struct pxa3xx_nand_info *)(&mtd[1]);
1178         info->pdev = pdev;
1179
1180         this = &info->nand_chip;
1181         mtd->priv = info;
1182         mtd->owner = THIS_MODULE;
1183
1184         info->clk = clk_get(&pdev->dev, NULL);
1185         if (IS_ERR(info->clk)) {
1186                 dev_err(&pdev->dev, "failed to get nand clock\n");
1187                 ret = PTR_ERR(info->clk);
1188                 goto fail_free_mtd;
1189         }
1190         clk_enable(info->clk);
1191
1192         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1193         if (r == NULL) {
1194                 dev_err(&pdev->dev, "no resource defined for data DMA\n");
1195                 ret = -ENXIO;
1196                 goto fail_put_clk;
1197         }
1198         info->drcmr_dat = r->start;
1199
1200         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1201         if (r == NULL) {
1202                 dev_err(&pdev->dev, "no resource defined for command DMA\n");
1203                 ret = -ENXIO;
1204                 goto fail_put_clk;
1205         }
1206         info->drcmr_cmd = r->start;
1207
1208         irq = platform_get_irq(pdev, 0);
1209         if (irq < 0) {
1210                 dev_err(&pdev->dev, "no IRQ resource defined\n");
1211                 ret = -ENXIO;
1212                 goto fail_put_clk;
1213         }
1214
1215         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1216         if (r == NULL) {
1217                 dev_err(&pdev->dev, "no IO memory resource defined\n");
1218                 ret = -ENODEV;
1219                 goto fail_put_clk;
1220         }
1221
1222         r = request_mem_region(r->start, resource_size(r), pdev->name);
1223         if (r == NULL) {
1224                 dev_err(&pdev->dev, "failed to request memory resource\n");
1225                 ret = -EBUSY;
1226                 goto fail_put_clk;
1227         }
1228
1229         info->mmio_base = ioremap(r->start, resource_size(r));
1230         if (info->mmio_base == NULL) {
1231                 dev_err(&pdev->dev, "ioremap() failed\n");
1232                 ret = -ENODEV;
1233                 goto fail_free_res;
1234         }
1235
1236         ret = pxa3xx_nand_init_buff(info);
1237         if (ret)
1238                 goto fail_free_io;
1239
1240         ret = request_irq(IRQ_NAND, pxa3xx_nand_irq, IRQF_DISABLED,
1241                                 pdev->name, info);
1242         if (ret < 0) {
1243                 dev_err(&pdev->dev, "failed to request IRQ\n");
1244                 goto fail_free_buf;
1245         }
1246
1247         ret = pxa3xx_nand_detect_flash(info, pdata);
1248         if (ret) {
1249                 dev_err(&pdev->dev, "failed to detect flash\n");
1250                 ret = -ENODEV;
1251                 goto fail_free_irq;
1252         }
1253
1254         pxa3xx_nand_init_mtd(mtd, info);
1255
1256         platform_set_drvdata(pdev, mtd);
1257
1258         if (nand_scan(mtd, 1)) {
1259                 dev_err(&pdev->dev, "failed to scan nand\n");
1260                 ret = -ENXIO;
1261                 goto fail_free_irq;
1262         }
1263
1264         return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
1265
1266 fail_free_irq:
1267         free_irq(IRQ_NAND, info);
1268 fail_free_buf:
1269         if (use_dma) {
1270                 pxa_free_dma(info->data_dma_ch);
1271                 dma_free_coherent(&pdev->dev, info->data_buff_size,
1272                         info->data_buff, info->data_buff_phys);
1273         } else
1274                 kfree(info->data_buff);
1275 fail_free_io:
1276         iounmap(info->mmio_base);
1277 fail_free_res:
1278         release_mem_region(r->start, resource_size(r));
1279 fail_put_clk:
1280         clk_disable(info->clk);
1281         clk_put(info->clk);
1282 fail_free_mtd:
1283         kfree(mtd);
1284         return ret;
1285 }
1286
1287 static int pxa3xx_nand_remove(struct platform_device *pdev)
1288 {
1289         struct mtd_info *mtd = platform_get_drvdata(pdev);
1290         struct pxa3xx_nand_info *info = mtd->priv;
1291         struct resource *r;
1292
1293         platform_set_drvdata(pdev, NULL);
1294
1295         del_mtd_device(mtd);
1296         del_mtd_partitions(mtd);
1297         free_irq(IRQ_NAND, info);
1298         if (use_dma) {
1299                 pxa_free_dma(info->data_dma_ch);
1300                 dma_free_writecombine(&pdev->dev, info->data_buff_size,
1301                                 info->data_buff, info->data_buff_phys);
1302         } else
1303                 kfree(info->data_buff);
1304
1305         iounmap(info->mmio_base);
1306         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1307         release_mem_region(r->start, resource_size(r));
1308
1309         clk_disable(info->clk);
1310         clk_put(info->clk);
1311
1312         kfree(mtd);
1313         return 0;
1314 }
1315
1316 #ifdef CONFIG_PM
1317 static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
1318 {
1319         struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1320         struct pxa3xx_nand_info *info = mtd->priv;
1321
1322         if (info->state != STATE_READY) {
1323                 dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
1324                 return -EAGAIN;
1325         }
1326
1327         return 0;
1328 }
1329
1330 static int pxa3xx_nand_resume(struct platform_device *pdev)
1331 {
1332         struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1333         struct pxa3xx_nand_info *info = mtd->priv;
1334
1335         clk_enable(info->clk);
1336
1337         return pxa3xx_nand_config_flash(info, info->flash_info);
1338 }
1339 #else
1340 #define pxa3xx_nand_suspend     NULL
1341 #define pxa3xx_nand_resume      NULL
1342 #endif
1343
1344 static struct platform_driver pxa3xx_nand_driver = {
1345         .driver = {
1346                 .name   = "pxa3xx-nand",
1347         },
1348         .probe          = pxa3xx_nand_probe,
1349         .remove         = pxa3xx_nand_remove,
1350         .suspend        = pxa3xx_nand_suspend,
1351         .resume         = pxa3xx_nand_resume,
1352 };
1353
1354 static int __init pxa3xx_nand_init(void)
1355 {
1356         return platform_driver_register(&pxa3xx_nand_driver);
1357 }
1358 module_init(pxa3xx_nand_init);
1359
1360 static void __exit pxa3xx_nand_exit(void)
1361 {
1362         platform_driver_unregister(&pxa3xx_nand_driver);
1363 }
1364 module_exit(pxa3xx_nand_exit);
1365
1366 MODULE_LICENSE("GPL");
1367 MODULE_DESCRIPTION("PXA3xx NAND controller driver");