drivers/mtd/nand/fsmc_nand.c

   1 /*
   2  * drivers/mtd/nand/fsmc_nand.c
   3  *
   4  * ST Microelectronics
   5  * Flexible Static Memory Controller (FSMC)
   6  * Driver for NAND portions
   7  *
   8  * Copyright © 2010 ST Microelectronics
   9  * Vipin Kumar <vipin.kumar@st.com>
  10  * Ashish Priyadarshi
  11  *
  12  * Based on drivers/mtd/nand/nomadik_nand.c
  13  *
  14  * This file is licensed under the terms of the GNU General Public
  15  * License version 2. This program is licensed "as is" without any
  16  * warranty of any kind, whether express or implied.
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/completion.h>
  21 #include <linux/dmaengine.h>
  22 #include <linux/dma-direction.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/err.h>
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/resource.h>
  28 #include <linux/sched.h>
  29 #include <linux/types.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/nand.h>
  32 #include <linux/mtd/nand_ecc.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/of.h>
  35 #include <linux/mtd/partitions.h>
  36 #include <linux/io.h>
  37 #include <linux/slab.h>
  38 #include <linux/amba/bus.h>
  39 #include <mtd/mtd-abi.h>
  40
  41 /* fsmc controller registers for NOR flash */
  42 #define CTRL                    0x0
  43         /* ctrl register definitions */
  44         #define BANK_ENABLE             (1 << 0)
  45         #define MUXED                   (1 << 1)
  46         #define NOR_DEV                 (2 << 2)
  47         #define WIDTH_8                 (0 << 4)
  48         #define WIDTH_16                (1 << 4)
  49         #define RSTPWRDWN               (1 << 6)
  50         #define WPROT                   (1 << 7)
  51         #define WRT_ENABLE              (1 << 12)
  52         #define WAIT_ENB                (1 << 13)
  53
  54 #define CTRL_TIM                0x4
  55         /* ctrl_tim register definitions */
  56
  57 #define FSMC_NOR_BANK_SZ        0x8
  58 #define FSMC_NOR_REG_SIZE       0x40
  59
  60 #define FSMC_NOR_REG(base, bank, reg)           (base + \
  61                                                 FSMC_NOR_BANK_SZ * (bank) + \
  62                                                 reg)
  63
  64 /* fsmc controller registers for NAND flash */
  65 #define PC                      0x00
  66         /* pc register definitions */
  67         #define FSMC_RESET              (1 << 0)
  68         #define FSMC_WAITON             (1 << 1)
  69         #define FSMC_ENABLE             (1 << 2)
  70         #define FSMC_DEVTYPE_NAND       (1 << 3)
  71         #define FSMC_DEVWID_8           (0 << 4)
  72         #define FSMC_DEVWID_16          (1 << 4)
  73         #define FSMC_ECCEN              (1 << 6)
  74         #define FSMC_ECCPLEN_512        (0 << 7)
  75         #define FSMC_ECCPLEN_256        (1 << 7)
  76         #define FSMC_TCLR_1             (1)
  77         #define FSMC_TCLR_SHIFT         (9)
  78         #define FSMC_TCLR_MASK          (0xF)
  79         #define FSMC_TAR_1              (1)
  80         #define FSMC_TAR_SHIFT          (13)
  81         #define FSMC_TAR_MASK           (0xF)
  82 #define STS                     0x04
  83         /* sts register definitions */
  84         #define FSMC_CODE_RDY           (1 << 15)
  85 #define COMM                    0x08
  86         /* comm register definitions */
  87         #define FSMC_TSET_0             0
  88         #define FSMC_TSET_SHIFT         0
  89         #define FSMC_TSET_MASK          0xFF
  90         #define FSMC_TWAIT_6            6
  91         #define FSMC_TWAIT_SHIFT        8
  92         #define FSMC_TWAIT_MASK         0xFF
  93         #define FSMC_THOLD_4            4
  94         #define FSMC_THOLD_SHIFT        16
  95         #define FSMC_THOLD_MASK         0xFF
  96         #define FSMC_THIZ_1             1
  97         #define FSMC_THIZ_SHIFT         24
  98         #define FSMC_THIZ_MASK          0xFF
  99 #define ATTRIB                  0x0C
 100 #define IOATA                   0x10
 101 #define ECC1                    0x14
 102 #define ECC2                    0x18
 103 #define ECC3                    0x1C
 104 #define FSMC_NAND_BANK_SZ       0x20
 105
 106 #define FSMC_NAND_REG(base, bank, reg)          (base + FSMC_NOR_REG_SIZE + \
 107                                                 (FSMC_NAND_BANK_SZ * (bank)) + \
 108                                                 reg)
 109
 110 #define FSMC_BUSY_WAIT_TIMEOUT  (1 * HZ)
 111
 112 struct fsmc_nand_timings {
 113         uint8_t tclr;
 114         uint8_t tar;
 115         uint8_t thiz;
 116         uint8_t thold;
 117         uint8_t twait;
 118         uint8_t tset;
 119 };
 120
 121 enum access_mode {
 122         USE_DMA_ACCESS = 1,
 123         USE_WORD_ACCESS,
 124 };
 125
 126 /**
 127  * struct fsmc_nand_data - structure for FSMC NAND device state
 128  *
 129  * @pid:                Part ID on the AMBA PrimeCell format
 130  * @mtd:                MTD info for a NAND flash.
 131  * @nand:               Chip related info for a NAND flash.
 132  * @partitions:         Partition info for a NAND Flash.
 133  * @nr_partitions:      Total number of partition of a NAND flash.
 134  *
 135  * @bank:               Bank number for probed device.
 136  * @clk:                Clock structure for FSMC.
 137  *
 138  * @read_dma_chan:      DMA channel for read access
 139  * @write_dma_chan:     DMA channel for write access to NAND
 140  * @dma_access_complete: Completion structure
 141  *
 142  * @data_pa:            NAND Physical port for Data.
 143  * @data_va:            NAND port for Data.
 144  * @cmd_va:             NAND port for Command.
 145  * @addr_va:            NAND port for Address.
 146  * @regs_va:            FSMC regs base address.
 147  */
 148 struct fsmc_nand_data {
 149         u32                     pid;
 150         struct nand_chip        nand;
 151
 152         unsigned int            bank;
 153         struct device           *dev;
 154         enum access_mode        mode;
 155         struct clk              *clk;
 156
 157         /* DMA related objects */
 158         struct dma_chan         *read_dma_chan;
 159         struct dma_chan         *write_dma_chan;
 160         struct completion       dma_access_complete;
 161
 162         struct fsmc_nand_timings *dev_timings;
 163
 164         dma_addr_t              data_pa;
 165         void __iomem            *data_va;
 166         void __iomem            *cmd_va;
 167         void __iomem            *addr_va;
 168         void __iomem            *regs_va;
 169 };
 170
 171 static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
 172                                    struct mtd_oob_region *oobregion)
 173 {
 174         struct nand_chip *chip = mtd_to_nand(mtd);
 175
 176         if (section >= chip->ecc.steps)
 177                 return -ERANGE;
 178
 179         oobregion->offset = (section * 16) + 2;
 180         oobregion->length = 3;
 181
 182         return 0;
 183 }
 184
 185 static int fsmc_ecc1_ooblayout_free(struct mtd_info *mtd, int section,
 186                                     struct mtd_oob_region *oobregion)
 187 {
 188         struct nand_chip *chip = mtd_to_nand(mtd);
 189
 190         if (section >= chip->ecc.steps)
 191                 return -ERANGE;
 192
 193         oobregion->offset = (section * 16) + 8;
 194
 195         if (section < chip->ecc.steps - 1)
 196                 oobregion->length = 8;
 197         else
 198                 oobregion->length = mtd->oobsize - oobregion->offset;
 199
 200         return 0;
 201 }
 202
 203 static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
 204         .ecc = fsmc_ecc1_ooblayout_ecc,
 205         .free = fsmc_ecc1_ooblayout_free,
 206 };
 207
 208 /*
 209  * ECC placement definitions in oobfree type format.
 210  * There are 13 bytes of ecc for every 512 byte block and it has to be read
 211  * consecutively and immediately after the 512 byte data block for hardware to
 212  * generate the error bit offsets in 512 byte data.
 213  */
 214 static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
 215                                    struct mtd_oob_region *oobregion)
 216 {
 217         struct nand_chip *chip = mtd_to_nand(mtd);
 218
 219         if (section >= chip->ecc.steps)
 220                 return -ERANGE;
 221
 222         oobregion->length = chip->ecc.bytes;
 223
 224         if (!section && mtd->writesize <= 512)
 225                 oobregion->offset = 0;
 226         else
 227                 oobregion->offset = (section * 16) + 2;
 228
 229         return 0;
 230 }
 231
 232 static int fsmc_ecc4_ooblayout_free(struct mtd_info *mtd, int section,
 233                                     struct mtd_oob_region *oobregion)
 234 {
 235         struct nand_chip *chip = mtd_to_nand(mtd);
 236
 237         if (section >= chip->ecc.steps)
 238                 return -ERANGE;
 239
 240         oobregion->offset = (section * 16) + 15;
 241
 242         if (section < chip->ecc.steps - 1)
 243                 oobregion->length = 3;
 244         else
 245                 oobregion->length = mtd->oobsize - oobregion->offset;
 246
 247         return 0;
 248 }
 249
 250 static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
 251         .ecc = fsmc_ecc4_ooblayout_ecc,
 252         .free = fsmc_ecc4_ooblayout_free,
 253 };
 254
 255 static inline struct fsmc_nand_data *mtd_to_fsmc(struct mtd_info *mtd)
 256 {
 257         return container_of(mtd_to_nand(mtd), struct fsmc_nand_data, nand);
 258 }
 259
 260 /*
 261  * fsmc_cmd_ctrl - For facilitaing Hardware access
 262  * This routine allows hardware specific access to control-lines(ALE,CLE)
 263  */
 264 static void fsmc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 265 {
 266         struct nand_chip *this = mtd_to_nand(mtd);
 267         struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
 268         void __iomem *regs = host->regs_va;
 269         unsigned int bank = host->bank;
 270
 271         if (ctrl & NAND_CTRL_CHANGE) {
 272                 u32 pc;
 273
 274                 if (ctrl & NAND_CLE) {
 275                         this->IO_ADDR_R = host->cmd_va;
 276                         this->IO_ADDR_W = host->cmd_va;
 277                 } else if (ctrl & NAND_ALE) {
 278                         this->IO_ADDR_R = host->addr_va;
 279                         this->IO_ADDR_W = host->addr_va;
 280                 } else {
 281                         this->IO_ADDR_R = host->data_va;
 282                         this->IO_ADDR_W = host->data_va;
 283                 }
 284
 285                 pc = readl(FSMC_NAND_REG(regs, bank, PC));
 286                 if (ctrl & NAND_NCE)
 287                         pc |= FSMC_ENABLE;
 288                 else
 289                         pc &= ~FSMC_ENABLE;
 290                 writel_relaxed(pc, FSMC_NAND_REG(regs, bank, PC));
 291         }
 292
 293         mb();
 294
 295         if (cmd != NAND_CMD_NONE)
 296                 writeb_relaxed(cmd, this->IO_ADDR_W);
 297 }
 298
 299 /*
 300  * fsmc_nand_setup - FSMC (Flexible Static Memory Controller) init routine
 301  *
 302  * This routine initializes timing parameters related to NAND memory access in
 303  * FSMC registers
 304  */
 305 static void fsmc_nand_setup(struct fsmc_nand_data *host,
 306                             struct fsmc_nand_timings *tims)
 307 {
 308         uint32_t value = FSMC_DEVTYPE_NAND | FSMC_ENABLE | FSMC_WAITON;
 309         uint32_t tclr, tar, thiz, thold, twait, tset;
 310         unsigned int bank = host->bank;
 311         void __iomem *regs = host->regs_va;
 312
 313         tclr = (tims->tclr & FSMC_TCLR_MASK) << FSMC_TCLR_SHIFT;
 314         tar = (tims->tar & FSMC_TAR_MASK) << FSMC_TAR_SHIFT;
 315         thiz = (tims->thiz & FSMC_THIZ_MASK) << FSMC_THIZ_SHIFT;
 316         thold = (tims->thold & FSMC_THOLD_MASK) << FSMC_THOLD_SHIFT;
 317         twait = (tims->twait & FSMC_TWAIT_MASK) << FSMC_TWAIT_SHIFT;
 318         tset = (tims->tset & FSMC_TSET_MASK) << FSMC_TSET_SHIFT;
 319
 320         if (host->nand.options & NAND_BUSWIDTH_16)
 321                 writel_relaxed(value | FSMC_DEVWID_16,
 322                                 FSMC_NAND_REG(regs, bank, PC));
 323         else
 324                 writel_relaxed(value | FSMC_DEVWID_8,
 325                                 FSMC_NAND_REG(regs, bank, PC));
 326
 327         writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) | tclr | tar,
 328                         FSMC_NAND_REG(regs, bank, PC));
 329         writel_relaxed(thiz | thold | twait | tset,
 330                         FSMC_NAND_REG(regs, bank, COMM));
 331         writel_relaxed(thiz | thold | twait | tset,
 332                         FSMC_NAND_REG(regs, bank, ATTRIB));
 333 }
 334
 335 static int fsmc_calc_timings(struct fsmc_nand_data *host,
 336                              const struct nand_sdr_timings *sdrt,
 337                              struct fsmc_nand_timings *tims)
 338 {
 339         unsigned long hclk = clk_get_rate(host->clk);
 340         unsigned long hclkn = NSEC_PER_SEC / hclk;
 341         uint32_t thiz, thold, twait, tset;
 342
 343         if (sdrt->tRC_min < 30000)
 344                 return -EOPNOTSUPP;
 345
 346         tims->tar = DIV_ROUND_UP(sdrt->tAR_min / 1000, hclkn) - 1;
 347         if (tims->tar > FSMC_TAR_MASK)
 348                 tims->tar = FSMC_TAR_MASK;
 349         tims->tclr = DIV_ROUND_UP(sdrt->tCLR_min / 1000, hclkn) - 1;
 350         if (tims->tclr > FSMC_TCLR_MASK)
 351                 tims->tclr = FSMC_TCLR_MASK;
 352
 353         thiz = sdrt->tCS_min - sdrt->tWP_min;
 354         tims->thiz = DIV_ROUND_UP(thiz / 1000, hclkn);
 355
 356         thold = sdrt->tDH_min;
 357         if (thold < sdrt->tCH_min)
 358                 thold = sdrt->tCH_min;
 359         if (thold < sdrt->tCLH_min)
 360                 thold = sdrt->tCLH_min;
 361         if (thold < sdrt->tWH_min)
 362                 thold = sdrt->tWH_min;
 363         if (thold < sdrt->tALH_min)
 364                 thold = sdrt->tALH_min;
 365         if (thold < sdrt->tREH_min)
 366                 thold = sdrt->tREH_min;
 367         tims->thold = DIV_ROUND_UP(thold / 1000, hclkn);
 368         if (tims->thold == 0)
 369                 tims->thold = 1;
 370         else if (tims->thold > FSMC_THOLD_MASK)
 371                 tims->thold = FSMC_THOLD_MASK;
 372
 373         twait = max(sdrt->tRP_min, sdrt->tWP_min);
 374         tims->twait = DIV_ROUND_UP(twait / 1000, hclkn) - 1;
 375         if (tims->twait == 0)
 376                 tims->twait = 1;
 377         else if (tims->twait > FSMC_TWAIT_MASK)
 378                 tims->twait = FSMC_TWAIT_MASK;
 379
 380         tset = max(sdrt->tCS_min - sdrt->tWP_min,
 381                    sdrt->tCEA_max - sdrt->tREA_max);
 382         tims->tset = DIV_ROUND_UP(tset / 1000, hclkn) - 1;
 383         if (tims->tset == 0)
 384                 tims->tset = 1;
 385         else if (tims->tset > FSMC_TSET_MASK)
 386                 tims->tset = FSMC_TSET_MASK;
 387
 388         return 0;
 389 }
 390
 391 static int fsmc_setup_data_interface(struct mtd_info *mtd, int csline,
 392                                      const struct nand_data_interface *conf)
 393 {
 394         struct nand_chip *nand = mtd_to_nand(mtd);
 395         struct fsmc_nand_data *host = nand_get_controller_data(nand);
 396         struct fsmc_nand_timings tims;
 397         const struct nand_sdr_timings *sdrt;
 398         int ret;
 399
 400         sdrt = nand_get_sdr_timings(conf);
 401         if (IS_ERR(sdrt))
 402                 return PTR_ERR(sdrt);
 403
 404         ret = fsmc_calc_timings(host, sdrt, &tims);
 405         if (ret)
 406                 return ret;
 407
 408         if (csline == NAND_DATA_IFACE_CHECK_ONLY)
 409                 return 0;
 410
 411         fsmc_nand_setup(host, &tims);
 412
 413         return 0;
 414 }
 415
 416 /*
 417  * fsmc_enable_hwecc - Enables Hardware ECC through FSMC registers
 418  */
 419 static void fsmc_enable_hwecc(struct mtd_info *mtd, int mode)
 420 {
 421         struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
 422         void __iomem *regs = host->regs_va;
 423         uint32_t bank = host->bank;
 424
 425         writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) & ~FSMC_ECCPLEN_256,
 426                         FSMC_NAND_REG(regs, bank, PC));
 427         writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) & ~FSMC_ECCEN,
 428                         FSMC_NAND_REG(regs, bank, PC));
 429         writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) | FSMC_ECCEN,
 430                         FSMC_NAND_REG(regs, bank, PC));
 431 }
 432
 433 /*
 434  * fsmc_read_hwecc_ecc4 - Hardware ECC calculator for ecc4 option supported by
 435  * FSMC. ECC is 13 bytes for 512 bytes of data (supports error correction up to
 436  * max of 8-bits)
 437  */
 438 static int fsmc_read_hwecc_ecc4(struct mtd_info *mtd, const uint8_t *data,
 439                                 uint8_t *ecc)
 440 {
 441         struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
 442         void __iomem *regs = host->regs_va;
 443         uint32_t bank = host->bank;
 444         uint32_t ecc_tmp;
 445         unsigned long deadline = jiffies + FSMC_BUSY_WAIT_TIMEOUT;
 446
 447         do {
 448                 if (readl_relaxed(FSMC_NAND_REG(regs, bank, STS)) & FSMC_CODE_RDY)
 449                         break;
 450                 else
 451                         cond_resched();
 452         } while (!time_after_eq(jiffies, deadline));
 453
 454         if (time_after_eq(jiffies, deadline)) {
 455                 dev_err(host->dev, "calculate ecc timed out\n");
 456                 return -ETIMEDOUT;
 457         }
 458
 459         ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
 460         ecc[0] = (uint8_t) (ecc_tmp >> 0);
 461         ecc[1] = (uint8_t) (ecc_tmp >> 8);
 462         ecc[2] = (uint8_t) (ecc_tmp >> 16);
 463         ecc[3] = (uint8_t) (ecc_tmp >> 24);
 464
 465         ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC2));
 466         ecc[4] = (uint8_t) (ecc_tmp >> 0);
 467         ecc[5] = (uint8_t) (ecc_tmp >> 8);
 468         ecc[6] = (uint8_t) (ecc_tmp >> 16);
 469         ecc[7] = (uint8_t) (ecc_tmp >> 24);
 470
 471         ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC3));
 472         ecc[8] = (uint8_t) (ecc_tmp >> 0);
 473         ecc[9] = (uint8_t) (ecc_tmp >> 8);
 474         ecc[10] = (uint8_t) (ecc_tmp >> 16);
 475         ecc[11] = (uint8_t) (ecc_tmp >> 24);
 476
 477         ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, STS));
 478         ecc[12] = (uint8_t) (ecc_tmp >> 16);
 479
 480         return 0;
 481 }
 482
 483 /*
 484  * fsmc_read_hwecc_ecc1 - Hardware ECC calculator for ecc1 option supported by
 485  * FSMC. ECC is 3 bytes for 512 bytes of data (supports error correction up to
 486  * max of 1-bit)
 487  */
 488 static int fsmc_read_hwecc_ecc1(struct mtd_info *mtd, const uint8_t *data,
 489                                 uint8_t *ecc)
 490 {
 491         struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
 492         void __iomem *regs = host->regs_va;
 493         uint32_t bank = host->bank;
 494         uint32_t ecc_tmp;
 495
 496         ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
 497         ecc[0] = (uint8_t) (ecc_tmp >> 0);
 498         ecc[1] = (uint8_t) (ecc_tmp >> 8);
 499         ecc[2] = (uint8_t) (ecc_tmp >> 16);
 500
 501         return 0;
 502 }
 503
 504 /* Count the number of 0's in buff upto a max of max_bits */
 505 static int count_written_bits(uint8_t *buff, int size, int max_bits)
 506 {
 507         int k, written_bits = 0;
 508
 509         for (k = 0; k < size; k++) {
 510                 written_bits += hweight8(~buff[k]);
 511                 if (written_bits > max_bits)
 512                         break;
 513         }
 514
 515         return written_bits;
 516 }
 517
 518 static void dma_complete(void *param)
 519 {
 520         struct fsmc_nand_data *host = param;
 521
 522         complete(&host->dma_access_complete);
 523 }
 524
 525 static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
 526                 enum dma_data_direction direction)
 527 {
 528         struct dma_chan *chan;
 529         struct dma_device *dma_dev;
 530         struct dma_async_tx_descriptor *tx;
 531         dma_addr_t dma_dst, dma_src, dma_addr;
 532         dma_cookie_t cookie;
 533         unsigned long flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 534         int ret;
 535         unsigned long time_left;
 536
 537         if (direction == DMA_TO_DEVICE)
 538                 chan = host->write_dma_chan;
 539         else if (direction == DMA_FROM_DEVICE)
 540                 chan = host->read_dma_chan;
 541         else
 542                 return -EINVAL;
 543
 544         dma_dev = chan->device;
 545         dma_addr = dma_map_single(dma_dev->dev, buffer, len, direction);
 546
 547         if (direction == DMA_TO_DEVICE) {
 548                 dma_src = dma_addr;
 549                 dma_dst = host->data_pa;
 550         } else {
 551                 dma_src = host->data_pa;
 552                 dma_dst = dma_addr;
 553         }
 554
 555         tx = dma_dev->device_prep_dma_memcpy(chan, dma_dst, dma_src,
 556                         len, flags);
 557         if (!tx) {
 558                 dev_err(host->dev, "device_prep_dma_memcpy error\n");
 559                 ret = -EIO;
 560                 goto unmap_dma;
 561         }
 562
 563         tx->callback = dma_complete;
 564         tx->callback_param = host;
 565         cookie = tx->tx_submit(tx);
 566
 567         ret = dma_submit_error(cookie);
 568         if (ret) {
 569                 dev_err(host->dev, "dma_submit_error %d\n", cookie);
 570                 goto unmap_dma;
 571         }
 572
 573         dma_async_issue_pending(chan);
 574
 575         time_left =
 576         wait_for_completion_timeout(&host->dma_access_complete,
 577                                 msecs_to_jiffies(3000));
 578         if (time_left == 0) {
 579                 dmaengine_terminate_all(chan);
 580                 dev_err(host->dev, "wait_for_completion_timeout\n");
 581                 ret = -ETIMEDOUT;
 582                 goto unmap_dma;
 583         }
 584
 585         ret = 0;
 586
 587 unmap_dma:
 588         dma_unmap_single(dma_dev->dev, dma_addr, len, direction);
 589
 590         return ret;
 591 }
 592
 593 /*
 594  * fsmc_write_buf - write buffer to chip
 595  * @mtd:        MTD device structure
 596  * @buf:        data buffer
 597  * @len:        number of bytes to write
 598  */
 599 static void fsmc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 600 {
 601         int i;
 602         struct nand_chip *chip = mtd_to_nand(mtd);
 603
 604         if (IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
 605                         IS_ALIGNED(len, sizeof(uint32_t))) {
 606                 uint32_t *p = (uint32_t *)buf;
 607                 len = len >> 2;
 608                 for (i = 0; i < len; i++)
 609                         writel_relaxed(p[i], chip->IO_ADDR_W);
 610         } else {
 611                 for (i = 0; i < len; i++)
 612                         writeb_relaxed(buf[i], chip->IO_ADDR_W);
 613         }
 614 }
 615
 616 /*
 617  * fsmc_read_buf - read chip data into buffer
 618  * @mtd:        MTD device structure
 619  * @buf:        buffer to store date
 620  * @len:        number of bytes to read
 621  */
 622 static void fsmc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 623 {
 624         int i;
 625         struct nand_chip *chip = mtd_to_nand(mtd);
 626
 627         if (IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
 628                         IS_ALIGNED(len, sizeof(uint32_t))) {
 629                 uint32_t *p = (uint32_t *)buf;
 630                 len = len >> 2;
 631                 for (i = 0; i < len; i++)
 632                         p[i] = readl_relaxed(chip->IO_ADDR_R);
 633         } else {
 634                 for (i = 0; i < len; i++)
 635                         buf[i] = readb_relaxed(chip->IO_ADDR_R);
 636         }
 637 }
 638
 639 /*
 640  * fsmc_read_buf_dma - read chip data into buffer
 641  * @mtd:        MTD device structure
 642  * @buf:        buffer to store date
 643  * @len:        number of bytes to read
 644  */
 645 static void fsmc_read_buf_dma(struct mtd_info *mtd, uint8_t *buf, int len)
 646 {
 647         struct fsmc_nand_data *host  = mtd_to_fsmc(mtd);
 648
 649         dma_xfer(host, buf, len, DMA_FROM_DEVICE);
 650 }
 651
 652 /*
 653  * fsmc_write_buf_dma - write buffer to chip
 654  * @mtd:        MTD device structure
 655  * @buf:        data buffer
 656  * @len:        number of bytes to write
 657  */
 658 static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
 659                 int len)
 660 {
 661         struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
 662
 663         dma_xfer(host, (void *)buf, len, DMA_TO_DEVICE);
 664 }
 665
 666 /*
 667  * fsmc_read_page_hwecc
 668  * @mtd:        mtd info structure
 669  * @chip:       nand chip info structure
 670  * @buf:        buffer to store read data
 671  * @oob_required:       caller expects OOB data read to chip->oob_poi
 672  * @page:       page number to read
 673  *
 674  * This routine is needed for fsmc version 8 as reading from NAND chip has to be
 675  * performed in a strict sequence as follows:
 676  * data(512 byte) -> ecc(13 byte)
 677  * After this read, fsmc hardware generates and reports error data bits(up to a
 678  * max of 8 bits)
 679  */
 680 static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 681                                  uint8_t *buf, int oob_required, int page)
 682 {
 683         int i, j, s, stat, eccsize = chip->ecc.size;
 684         int eccbytes = chip->ecc.bytes;
 685         int eccsteps = chip->ecc.steps;
 686         uint8_t *p = buf;
 687         uint8_t *ecc_calc = chip->buffers->ecccalc;
 688         uint8_t *ecc_code = chip->buffers->ecccode;
 689         int off, len, group = 0;
 690         /*
 691          * ecc_oob is intentionally taken as uint16_t. In 16bit devices, we
 692          * end up reading 14 bytes (7 words) from oob. The local array is
 693          * to maintain word alignment
 694          */
 695         uint16_t ecc_oob[7];
 696         uint8_t *oob = (uint8_t *)&ecc_oob[0];
 697         unsigned int max_bitflips = 0;
 698
 699         for (i = 0, s = 0; s < eccsteps; s++, i += eccbytes, p += eccsize) {
 700                 chip->cmdfunc(mtd, NAND_CMD_READ0, s * eccsize, page);
 701                 chip->ecc.hwctl(mtd, NAND_ECC_READ);
 702                 chip->read_buf(mtd, p, eccsize);
 703
 704                 for (j = 0; j < eccbytes;) {
 705                         struct mtd_oob_region oobregion;
 706                         int ret;
 707
 708                         ret = mtd_ooblayout_ecc(mtd, group++, &oobregion);
 709                         if (ret)
 710                                 return ret;
 711
 712                         off = oobregion.offset;
 713                         len = oobregion.length;
 714
 715                         /*
 716                          * length is intentionally kept a higher multiple of 2
 717                          * to read at least 13 bytes even in case of 16 bit NAND
 718                          * devices
 719                          */
 720                         if (chip->options & NAND_BUSWIDTH_16)
 721                                 len = roundup(len, 2);
 722
 723                         chip->cmdfunc(mtd, NAND_CMD_READOOB, off, page);
 724                         chip->read_buf(mtd, oob + j, len);
 725                         j += len;
 726                 }
 727
 728                 memcpy(&ecc_code[i], oob, chip->ecc.bytes);
 729                 chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 730
 731                 stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
 732                 if (stat < 0) {
 733                         mtd->ecc_stats.failed++;
 734                 } else {
 735                         mtd->ecc_stats.corrected += stat;
 736                         max_bitflips = max_t(unsigned int, max_bitflips, stat);
 737                 }
 738         }
 739
 740         return max_bitflips;
 741 }
 742
 743 /*
 744  * fsmc_bch8_correct_data
 745  * @mtd:        mtd info structure
 746  * @dat:        buffer of read data
 747  * @read_ecc:   ecc read from device spare area
 748  * @calc_ecc:   ecc calculated from read data
 749  *
 750  * calc_ecc is a 104 bit information containing maximum of 8 error
 751  * offset informations of 13 bits each in 512 bytes of read data.
 752  */
 753 static int fsmc_bch8_correct_data(struct mtd_info *mtd, uint8_t *dat,
 754                              uint8_t *read_ecc, uint8_t *calc_ecc)
 755 {
 756         struct nand_chip *chip = mtd_to_nand(mtd);
 757         struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
 758         void __iomem *regs = host->regs_va;
 759         unsigned int bank = host->bank;
 760         uint32_t err_idx[8];
 761         uint32_t num_err, i;
 762         uint32_t ecc1, ecc2, ecc3, ecc4;
 763
 764         num_err = (readl_relaxed(FSMC_NAND_REG(regs, bank, STS)) >> 10) & 0xF;
 765
 766         /* no bit flipping */
 767         if (likely(num_err == 0))
 768                 return 0;
 769
 770         /* too many errors */
 771         if (unlikely(num_err > 8)) {
 772                 /*
 773                  * This is a temporary erase check. A newly erased page read
 774                  * would result in an ecc error because the oob data is also
 775                  * erased to FF and the calculated ecc for an FF data is not
 776                  * FF..FF.
 777                  * This is a workaround to skip performing correction in case
 778                  * data is FF..FF
 779                  *
 780                  * Logic:
 781                  * For every page, each bit written as 0 is counted until these
 782                  * number of bits are greater than 8 (the maximum correction
 783                  * capability of FSMC for each 512 + 13 bytes)
 784                  */
 785
 786                 int bits_ecc = count_written_bits(read_ecc, chip->ecc.bytes, 8);
 787                 int bits_data = count_written_bits(dat, chip->ecc.size, 8);
 788
 789                 if ((bits_ecc + bits_data) <= 8) {
 790                         if (bits_data)
 791                                 memset(dat, 0xff, chip->ecc.size);
 792                         return bits_data;
 793                 }
 794
 795                 return -EBADMSG;
 796         }
 797
 798         /*
 799          * ------------------- calc_ecc[] bit wise -----------|--13 bits--|
 800          * |---idx[7]--|--.....-----|---idx[2]--||---idx[1]--||---idx[0]--|
 801          *
 802          * calc_ecc is a 104 bit information containing maximum of 8 error
 803          * offset informations of 13 bits each. calc_ecc is copied into a
 804          * uint64_t array and error offset indexes are populated in err_idx
 805          * array
 806          */
 807         ecc1 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
 808         ecc2 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC2));
 809         ecc3 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC3));
 810         ecc4 = readl_relaxed(FSMC_NAND_REG(regs, bank, STS));
 811
 812         err_idx[0] = (ecc1 >> 0) & 0x1FFF;
 813         err_idx[1] = (ecc1 >> 13) & 0x1FFF;
 814         err_idx[2] = (((ecc2 >> 0) & 0x7F) << 6) | ((ecc1 >> 26) & 0x3F);
 815         err_idx[3] = (ecc2 >> 7) & 0x1FFF;
 816         err_idx[4] = (((ecc3 >> 0) & 0x1) << 12) | ((ecc2 >> 20) & 0xFFF);
 817         err_idx[5] = (ecc3 >> 1) & 0x1FFF;
 818         err_idx[6] = (ecc3 >> 14) & 0x1FFF;
 819         err_idx[7] = (((ecc4 >> 16) & 0xFF) << 5) | ((ecc3 >> 27) & 0x1F);
 820
 821         i = 0;
 822         while (num_err--) {
 823                 change_bit(0, (unsigned long *)&err_idx[i]);
 824                 change_bit(1, (unsigned long *)&err_idx[i]);
 825
 826                 if (err_idx[i] < chip->ecc.size * 8) {
 827                         change_bit(err_idx[i], (unsigned long *)dat);
 828                         i++;
 829                 }
 830         }
 831         return i;
 832 }
 833
 834 static bool filter(struct dma_chan *chan, void *slave)
 835 {
 836         chan->private = slave;
 837         return true;
 838 }
 839
 840 static int fsmc_nand_probe_config_dt(struct platform_device *pdev,
 841                                      struct fsmc_nand_data *host,
 842                                      struct nand_chip *nand)
 843 {
 844         struct device_node *np = pdev->dev.of_node;
 845         u32 val;
 846         int ret;
 847
 848         nand->options = 0;
 849
 850         if (!of_property_read_u32(np, "bank-width", &val)) {
 851                 if (val == 2) {
 852                         nand->options |= NAND_BUSWIDTH_16;
 853                 } else if (val != 1) {
 854                         dev_err(&pdev->dev, "invalid bank-width %u\n", val);
 855                         return -EINVAL;
 856                 }
 857         }
 858
 859         if (of_get_property(np, "nand-skip-bbtscan", NULL))
 860                 nand->options |= NAND_SKIP_BBTSCAN;
 861
 862         host->dev_timings = devm_kzalloc(&pdev->dev,
 863                                 sizeof(*host->dev_timings), GFP_KERNEL);
 864         if (!host->dev_timings)
 865                 return -ENOMEM;
 866         ret = of_property_read_u8_array(np, "timings", (u8 *)host->dev_timings,
 867                                                 sizeof(*host->dev_timings));
 868         if (ret)
 869                 host->dev_timings = NULL;
 870
 871         /* Set default NAND bank to 0 */
 872         host->bank = 0;
 873         if (!of_property_read_u32(np, "bank", &val)) {
 874                 if (val > 3) {
 875                         dev_err(&pdev->dev, "invalid bank %u\n", val);
 876                         return -EINVAL;
 877                 }
 878                 host->bank = val;
 879         }
 880         return 0;
 881 }
 882
 883 /*
 884  * fsmc_nand_probe - Probe function
 885  * @pdev:       platform device structure
 886  */
 887 static int __init fsmc_nand_probe(struct platform_device *pdev)
 888 {
 889         struct fsmc_nand_data *host;
 890         struct mtd_info *mtd;
 891         struct nand_chip *nand;
 892         struct resource *res;
 893         dma_cap_mask_t mask;
 894         int ret = 0;
 895         u32 pid;
 896         int i;
 897
 898         /* Allocate memory for the device structure (and zero it) */
 899         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 900         if (!host)
 901                 return -ENOMEM;
 902
 903         nand = &host->nand;
 904
 905         ret = fsmc_nand_probe_config_dt(pdev, host, nand);
 906         if (ret)
 907                 return ret;
 908
 909         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
 910         host->data_va = devm_ioremap_resource(&pdev->dev, res);
 911         if (IS_ERR(host->data_va))
 912                 return PTR_ERR(host->data_va);
 913
 914         host->data_pa = (dma_addr_t)res->start;
 915
 916         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_addr");
 917         host->addr_va = devm_ioremap_resource(&pdev->dev, res);
 918         if (IS_ERR(host->addr_va))
 919                 return PTR_ERR(host->addr_va);
 920
 921         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_cmd");
 922         host->cmd_va = devm_ioremap_resource(&pdev->dev, res);
 923         if (IS_ERR(host->cmd_va))
 924                 return PTR_ERR(host->cmd_va);
 925
 926         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fsmc_regs");
 927         host->regs_va = devm_ioremap_resource(&pdev->dev, res);
 928         if (IS_ERR(host->regs_va))
 929                 return PTR_ERR(host->regs_va);
 930
 931         host->clk = devm_clk_get(&pdev->dev, NULL);
 932         if (IS_ERR(host->clk)) {
 933                 dev_err(&pdev->dev, "failed to fetch block clock\n");
 934                 return PTR_ERR(host->clk);
 935         }
 936
 937         ret = clk_prepare_enable(host->clk);
 938         if (ret)
 939                 return ret;
 940
 941         /*
 942          * This device ID is actually a common AMBA ID as used on the
 943          * AMBA PrimeCell bus. However it is not a PrimeCell.
 944          */
 945         for (pid = 0, i = 0; i < 4; i++)
 946                 pid |= (readl(host->regs_va + resource_size(res) - 0x20 + 4 * i) & 255) << (i * 8);
 947         host->pid = pid;
 948         dev_info(&pdev->dev, "FSMC device partno %03x, manufacturer %02x, "
 949                  "revision %02x, config %02x\n",
 950                  AMBA_PART_BITS(pid), AMBA_MANF_BITS(pid),
 951                  AMBA_REV_BITS(pid), AMBA_CONFIG_BITS(pid));
 952
 953         host->dev = &pdev->dev;
 954
 955         if (host->mode == USE_DMA_ACCESS)
 956                 init_completion(&host->dma_access_complete);
 957
 958         /* Link all private pointers */
 959         mtd = nand_to_mtd(&host->nand);
 960         nand_set_controller_data(nand, host);
 961         nand_set_flash_node(nand, pdev->dev.of_node);
 962
 963         mtd->dev.parent = &pdev->dev;
 964         nand->IO_ADDR_R = host->data_va;
 965         nand->IO_ADDR_W = host->data_va;
 966         nand->cmd_ctrl = fsmc_cmd_ctrl;
 967         nand->chip_delay = 30;
 968
 969         /*
 970          * Setup default ECC mode. nand_dt_init() called from nand_scan_ident()
 971          * can overwrite this value if the DT provides a different value.
 972          */
 973         nand->ecc.mode = NAND_ECC_HW;
 974         nand->ecc.hwctl = fsmc_enable_hwecc;
 975         nand->ecc.size = 512;
 976         nand->badblockbits = 7;
 977
 978         switch (host->mode) {
 979         case USE_DMA_ACCESS:
 980                 dma_cap_zero(mask);
 981                 dma_cap_set(DMA_MEMCPY, mask);
 982                 host->read_dma_chan = dma_request_channel(mask, filter, NULL);
 983                 if (!host->read_dma_chan) {
 984                         dev_err(&pdev->dev, "Unable to get read dma channel\n");
 985                         goto err_req_read_chnl;
 986                 }
 987                 host->write_dma_chan = dma_request_channel(mask, filter, NULL);
 988                 if (!host->write_dma_chan) {
 989                         dev_err(&pdev->dev, "Unable to get write dma channel\n");
 990                         goto err_req_write_chnl;
 991                 }
 992                 nand->read_buf = fsmc_read_buf_dma;
 993                 nand->write_buf = fsmc_write_buf_dma;
 994                 break;
 995
 996         default:
 997         case USE_WORD_ACCESS:
 998                 nand->read_buf = fsmc_read_buf;
 999                 nand->write_buf = fsmc_write_buf;
1000                 break;
1001         }
1002
1003         if (host->dev_timings)
1004                 fsmc_nand_setup(host, host->dev_timings);
1005         else
1006                 nand->setup_data_interface = fsmc_setup_data_interface;
1007
1008         if (AMBA_REV_BITS(host->pid) >= 8) {
1009                 nand->ecc.read_page = fsmc_read_page_hwecc;
1010                 nand->ecc.calculate = fsmc_read_hwecc_ecc4;
1011                 nand->ecc.correct = fsmc_bch8_correct_data;
1012                 nand->ecc.bytes = 13;
1013                 nand->ecc.strength = 8;
1014         }
1015
1016         /*
1017          * Scan to find existence of the device
1018          */
1019         ret = nand_scan_ident(mtd, 1, NULL);
1020         if (ret) {
1021                 dev_err(&pdev->dev, "No NAND Device found!\n");
1022                 goto err_scan_ident;
1023         }
1024
1025         if (AMBA_REV_BITS(host->pid) >= 8) {
1026                 switch (mtd->oobsize) {
1027                 case 16:
1028                 case 64:
1029                 case 128:
1030                 case 224:
1031                 case 256:
1032                         break;
1033                 default:
1034                         dev_warn(&pdev->dev, "No oob scheme defined for oobsize %d\n",
1035                                  mtd->oobsize);
1036                         ret = -EINVAL;
1037                         goto err_probe;
1038                 }
1039
1040                 mtd_set_ooblayout(mtd, &fsmc_ecc4_ooblayout_ops);
1041         } else {
1042                 switch (nand->ecc.mode) {
1043                 case NAND_ECC_HW:
1044                         dev_info(&pdev->dev, "Using 1-bit HW ECC scheme\n");
1045                         nand->ecc.calculate = fsmc_read_hwecc_ecc1;
1046                         nand->ecc.correct = nand_correct_data;
1047                         nand->ecc.bytes = 3;
1048                         nand->ecc.strength = 1;
1049                         break;
1050
1051                 case NAND_ECC_SOFT:
1052                         if (nand->ecc.algo == NAND_ECC_BCH) {
1053                                 dev_info(&pdev->dev, "Using 4-bit SW BCH ECC scheme\n");
1054                                 break;
1055                         }
1056
1057                 case NAND_ECC_ON_DIE:
1058                         break;
1059
1060                 default:
1061                         dev_err(&pdev->dev, "Unsupported ECC mode!\n");
1062                         goto err_probe;
1063                 }
1064
1065                 /*
1066                  * Don't set layout for BCH4 SW ECC. This will be
1067                  * generated later in nand_bch_init() later.
1068                  */
1069                 if (nand->ecc.mode == NAND_ECC_HW) {
1070                         switch (mtd->oobsize) {
1071                         case 16:
1072                         case 64:
1073                         case 128:
1074                                 mtd_set_ooblayout(mtd,
1075                                                   &fsmc_ecc1_ooblayout_ops);
1076                                 break;
1077                         default:
1078                                 dev_warn(&pdev->dev,
1079                                          "No oob scheme defined for oobsize %d\n",
1080                                          mtd->oobsize);
1081                                 ret = -EINVAL;
1082                                 goto err_probe;
1083                         }
1084                 }
1085         }
1086
1087         /* Second stage of scan to fill MTD data-structures */
1088         ret = nand_scan_tail(mtd);
1089         if (ret)
1090                 goto err_probe;
1091
1092         mtd->name = "nand";
1093         ret = mtd_device_register(mtd, NULL, 0);
1094         if (ret)
1095                 goto err_probe;
1096
1097         platform_set_drvdata(pdev, host);
1098         dev_info(&pdev->dev, "FSMC NAND driver registration successful\n");
1099         return 0;
1100
1101 err_probe:
1102 err_scan_ident:
1103         if (host->mode == USE_DMA_ACCESS)
1104                 dma_release_channel(host->write_dma_chan);
1105 err_req_write_chnl:
1106         if (host->mode == USE_DMA_ACCESS)
1107                 dma_release_channel(host->read_dma_chan);
1108 err_req_read_chnl:
1109         clk_disable_unprepare(host->clk);
1110         return ret;
1111 }
1112
1113 /*
1114  * Clean up routine
1115  */
1116 static int fsmc_nand_remove(struct platform_device *pdev)
1117 {
1118         struct fsmc_nand_data *host = platform_get_drvdata(pdev);
1119
1120         if (host) {
1121                 nand_release(nand_to_mtd(&host->nand));
1122
1123                 if (host->mode == USE_DMA_ACCESS) {
1124                         dma_release_channel(host->write_dma_chan);
1125                         dma_release_channel(host->read_dma_chan);
1126                 }
1127                 clk_disable_unprepare(host->clk);
1128         }
1129
1130         return 0;
1131 }
1132
1133 #ifdef CONFIG_PM_SLEEP
1134 static int fsmc_nand_suspend(struct device *dev)
1135 {
1136         struct fsmc_nand_data *host = dev_get_drvdata(dev);
1137         if (host)
1138                 clk_disable_unprepare(host->clk);
1139         return 0;
1140 }
1141
1142 static int fsmc_nand_resume(struct device *dev)
1143 {
1144         struct fsmc_nand_data *host = dev_get_drvdata(dev);
1145         if (host) {
1146                 clk_prepare_enable(host->clk);
1147                 if (host->dev_timings)
1148                         fsmc_nand_setup(host, host->dev_timings);
1149         }
1150         return 0;
1151 }
1152 #endif
1153
1154 static SIMPLE_DEV_PM_OPS(fsmc_nand_pm_ops, fsmc_nand_suspend, fsmc_nand_resume);
1155
1156 static const struct of_device_id fsmc_nand_id_table[] = {
1157         { .compatible = "st,spear600-fsmc-nand" },
1158         { .compatible = "stericsson,fsmc-nand" },
1159         {}
1160 };
1161 MODULE_DEVICE_TABLE(of, fsmc_nand_id_table);
1162
1163 static struct platform_driver fsmc_nand_driver = {
1164         .remove = fsmc_nand_remove,
1165         .driver = {
1166                 .name = "fsmc-nand",
1167                 .of_match_table = fsmc_nand_id_table,
1168                 .pm = &fsmc_nand_pm_ops,
1169         },
1170 };
1171
1172 module_platform_driver_probe(fsmc_nand_driver, fsmc_nand_probe);
1173
1174 MODULE_LICENSE("GPL");
1175 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>, Ashish Priyadarshi");
1176 MODULE_DESCRIPTION("NAND driver for SPEAr Platforms");