drivers/mtd/nand/atmel_nand.c

   1 /*
   2  *  Copyright © 2003 Rick Bronson
   3  *
   4  *  Derived from drivers/mtd/nand/autcpu12.c
   5  *       Copyright © 2001 Thomas Gleixner (gleixner@autronix.de)
   6  *
   7  *  Derived from drivers/mtd/spia.c
   8  *       Copyright © 2000 Steven J. Hill (sjhill@cotw.com)
   9  *
  10  *
  11  *  Add Hardware ECC support for AT91SAM9260 / AT91SAM9263
  12  *     Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright © 2007
  13  *
  14  *     Derived from Das U-Boot source code
  15  *              (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
  16  *     © Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
  17  *
  18  *  Add Programmable Multibit ECC support for various AT91 SoC
  19  *     © Copyright 2012 ATMEL, Hong Xu
  20  *
  21  *  Add Nand Flash Controller support for SAMA5 SoC
  22  *     © Copyright 2013 ATMEL, Josh Wu (josh.wu@atmel.com)
  23  *
  24  * This program is free software; you can redistribute it and/or modify
  25  * it under the terms of the GNU General Public License version 2 as
  26  * published by the Free Software Foundation.
  27  *
  28  */
  29
  30 #include <linux/clk.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/slab.h>
  33 #include <linux/module.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/of.h>
  37 #include <linux/of_device.h>
  38 #include <linux/of_gpio.h>
  39 #include <linux/of_mtd.h>
  40 #include <linux/mtd/mtd.h>
  41 #include <linux/mtd/nand.h>
  42 #include <linux/mtd/partitions.h>
  43
  44 #include <linux/delay.h>
  45 #include <linux/dmaengine.h>
  46 #include <linux/gpio.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/io.h>
  49 #include <linux/platform_data/atmel.h>
  50
  51 static int use_dma = 1;
  52 module_param(use_dma, int, 0);
  53
  54 static int on_flash_bbt = 0;
  55 module_param(on_flash_bbt, int, 0);
  56
  57 /* Register access macros */
  58 #define ecc_readl(add, reg)                             \
  59         __raw_readl(add + ATMEL_ECC_##reg)
  60 #define ecc_writel(add, reg, value)                     \
  61         __raw_writel((value), add + ATMEL_ECC_##reg)
  62
  63 #include "atmel_nand_ecc.h"     /* Hardware ECC registers */
  64 #include "atmel_nand_nfc.h"     /* Nand Flash Controller definition */
  65
  66 struct atmel_nand_caps {
  67         bool pmecc_correct_erase_page;
  68 };
  69
  70 /* oob layout for large page size
  71  * bad block info is on bytes 0 and 1
  72  * the bytes have to be consecutives to avoid
  73  * several NAND_CMD_RNDOUT during read
  74  */
  75 static struct nand_ecclayout atmel_oobinfo_large = {
  76         .eccbytes = 4,
  77         .eccpos = {60, 61, 62, 63},
  78         .oobfree = {
  79                 {2, 58}
  80         },
  81 };
  82
  83 /* oob layout for small page size
  84  * bad block info is on bytes 4 and 5
  85  * the bytes have to be consecutives to avoid
  86  * several NAND_CMD_RNDOUT during read
  87  */
  88 static struct nand_ecclayout atmel_oobinfo_small = {
  89         .eccbytes = 4,
  90         .eccpos = {0, 1, 2, 3},
  91         .oobfree = {
  92                 {6, 10}
  93         },
  94 };
  95
  96 struct atmel_nfc {
  97         void __iomem            *base_cmd_regs;
  98         void __iomem            *hsmc_regs;
  99         void                    *sram_bank0;
 100         dma_addr_t              sram_bank0_phys;
 101         bool                    use_nfc_sram;
 102         bool                    write_by_sram;
 103
 104         struct clk              *clk;
 105
 106         bool                    is_initialized;
 107         struct completion       comp_ready;
 108         struct completion       comp_cmd_done;
 109         struct completion       comp_xfer_done;
 110
 111         /* Point to the sram bank which include readed data via NFC */
 112         void                    *data_in_sram;
 113         bool                    will_write_sram;
 114 };
 115 static struct atmel_nfc nand_nfc;
 116
 117 struct atmel_nand_host {
 118         struct nand_chip        nand_chip;
 119         void __iomem            *io_base;
 120         dma_addr_t              io_phys;
 121         struct atmel_nand_data  board;
 122         struct device           *dev;
 123         void __iomem            *ecc;
 124
 125         struct completion       comp;
 126         struct dma_chan         *dma_chan;
 127
 128         struct atmel_nfc        *nfc;
 129
 130         const struct atmel_nand_caps    *caps;
 131         bool                    has_pmecc;
 132         u8                      pmecc_corr_cap;
 133         u16                     pmecc_sector_size;
 134         bool                    has_no_lookup_table;
 135         u32                     pmecc_lookup_table_offset;
 136         u32                     pmecc_lookup_table_offset_512;
 137         u32                     pmecc_lookup_table_offset_1024;
 138
 139         int                     pmecc_degree;   /* Degree of remainders */
 140         int                     pmecc_cw_len;   /* Length of codeword */
 141
 142         void __iomem            *pmerrloc_base;
 143         void __iomem            *pmecc_rom_base;
 144
 145         /* lookup table for alpha_to and index_of */
 146         void __iomem            *pmecc_alpha_to;
 147         void __iomem            *pmecc_index_of;
 148
 149         /* data for pmecc computation */
 150         int16_t                 *pmecc_partial_syn;
 151         int16_t                 *pmecc_si;
 152         int16_t                 *pmecc_smu;     /* Sigma table */
 153         int16_t                 *pmecc_lmu;     /* polynomal order */
 154         int                     *pmecc_mu;
 155         int                     *pmecc_dmu;
 156         int                     *pmecc_delta;
 157 };
 158
 159 static struct nand_ecclayout atmel_pmecc_oobinfo;
 160
 161 /*
 162  * Enable NAND.
 163  */
 164 static void atmel_nand_enable(struct atmel_nand_host *host)
 165 {
 166         if (gpio_is_valid(host->board.enable_pin))
 167                 gpio_set_value(host->board.enable_pin, 0);
 168 }
 169
 170 /*
 171  * Disable NAND.
 172  */
 173 static void atmel_nand_disable(struct atmel_nand_host *host)
 174 {
 175         if (gpio_is_valid(host->board.enable_pin))
 176                 gpio_set_value(host->board.enable_pin, 1);
 177 }
 178
 179 /*
 180  * Hardware specific access to control-lines
 181  */
 182 static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 183 {
 184         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 185         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 186
 187         if (ctrl & NAND_CTRL_CHANGE) {
 188                 if (ctrl & NAND_NCE)
 189                         atmel_nand_enable(host);
 190                 else
 191                         atmel_nand_disable(host);
 192         }
 193         if (cmd == NAND_CMD_NONE)
 194                 return;
 195
 196         if (ctrl & NAND_CLE)
 197                 writeb(cmd, host->io_base + (1 << host->board.cle));
 198         else
 199                 writeb(cmd, host->io_base + (1 << host->board.ale));
 200 }
 201
 202 /*
 203  * Read the Device Ready pin.
 204  */
 205 static int atmel_nand_device_ready(struct mtd_info *mtd)
 206 {
 207         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 208         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 209
 210         return gpio_get_value(host->board.rdy_pin) ^
 211                 !!host->board.rdy_pin_active_low;
 212 }
 213
 214 /* Set up for hardware ready pin and enable pin. */
 215 static int atmel_nand_set_enable_ready_pins(struct mtd_info *mtd)
 216 {
 217         struct nand_chip *chip = mtd_to_nand(mtd);
 218         struct atmel_nand_host *host = nand_get_controller_data(chip);
 219         int res = 0;
 220
 221         if (gpio_is_valid(host->board.rdy_pin)) {
 222                 res = devm_gpio_request(host->dev,
 223                                 host->board.rdy_pin, "nand_rdy");
 224                 if (res < 0) {
 225                         dev_err(host->dev,
 226                                 "can't request rdy gpio %d\n",
 227                                 host->board.rdy_pin);
 228                         return res;
 229                 }
 230
 231                 res = gpio_direction_input(host->board.rdy_pin);
 232                 if (res < 0) {
 233                         dev_err(host->dev,
 234                                 "can't request input direction rdy gpio %d\n",
 235                                 host->board.rdy_pin);
 236                         return res;
 237                 }
 238
 239                 chip->dev_ready = atmel_nand_device_ready;
 240         }
 241
 242         if (gpio_is_valid(host->board.enable_pin)) {
 243                 res = devm_gpio_request(host->dev,
 244                                 host->board.enable_pin, "nand_enable");
 245                 if (res < 0) {
 246                         dev_err(host->dev,
 247                                 "can't request enable gpio %d\n",
 248                                 host->board.enable_pin);
 249                         return res;
 250                 }
 251
 252                 res = gpio_direction_output(host->board.enable_pin, 1);
 253                 if (res < 0) {
 254                         dev_err(host->dev,
 255                                 "can't request output direction enable gpio %d\n",
 256                                 host->board.enable_pin);
 257                         return res;
 258                 }
 259         }
 260
 261         return res;
 262 }
 263
 264 /*
 265  * Minimal-overhead PIO for data access.
 266  */
 267 static void atmel_read_buf8(struct mtd_info *mtd, u8 *buf, int len)
 268 {
 269         struct nand_chip        *nand_chip = mtd_to_nand(mtd);
 270         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 271
 272         if (host->nfc && host->nfc->use_nfc_sram && host->nfc->data_in_sram) {
 273                 memcpy(buf, host->nfc->data_in_sram, len);
 274                 host->nfc->data_in_sram += len;
 275         } else {
 276                 __raw_readsb(nand_chip->IO_ADDR_R, buf, len);
 277         }
 278 }
 279
 280 static void atmel_read_buf16(struct mtd_info *mtd, u8 *buf, int len)
 281 {
 282         struct nand_chip        *nand_chip = mtd_to_nand(mtd);
 283         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 284
 285         if (host->nfc && host->nfc->use_nfc_sram && host->nfc->data_in_sram) {
 286                 memcpy(buf, host->nfc->data_in_sram, len);
 287                 host->nfc->data_in_sram += len;
 288         } else {
 289                 __raw_readsw(nand_chip->IO_ADDR_R, buf, len / 2);
 290         }
 291 }
 292
 293 static void atmel_write_buf8(struct mtd_info *mtd, const u8 *buf, int len)
 294 {
 295         struct nand_chip        *nand_chip = mtd_to_nand(mtd);
 296
 297         __raw_writesb(nand_chip->IO_ADDR_W, buf, len);
 298 }
 299
 300 static void atmel_write_buf16(struct mtd_info *mtd, const u8 *buf, int len)
 301 {
 302         struct nand_chip        *nand_chip = mtd_to_nand(mtd);
 303
 304         __raw_writesw(nand_chip->IO_ADDR_W, buf, len / 2);
 305 }
 306
 307 static void dma_complete_func(void *completion)
 308 {
 309         complete(completion);
 310 }
 311
 312 static int nfc_set_sram_bank(struct atmel_nand_host *host, unsigned int bank)
 313 {
 314         /* NFC only has two banks. Must be 0 or 1 */
 315         if (bank > 1)
 316                 return -EINVAL;
 317
 318         if (bank) {
 319                 struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
 320
 321                 /* Only for a 2k-page or lower flash, NFC can handle 2 banks */
 322                 if (mtd->writesize > 2048)
 323                         return -EINVAL;
 324                 nfc_writel(host->nfc->hsmc_regs, BANK, ATMEL_HSMC_NFC_BANK1);
 325         } else {
 326                 nfc_writel(host->nfc->hsmc_regs, BANK, ATMEL_HSMC_NFC_BANK0);
 327         }
 328
 329         return 0;
 330 }
 331
 332 static uint nfc_get_sram_off(struct atmel_nand_host *host)
 333 {
 334         if (nfc_readl(host->nfc->hsmc_regs, BANK) & ATMEL_HSMC_NFC_BANK1)
 335                 return NFC_SRAM_BANK1_OFFSET;
 336         else
 337                 return 0;
 338 }
 339
 340 static dma_addr_t nfc_sram_phys(struct atmel_nand_host *host)
 341 {
 342         if (nfc_readl(host->nfc->hsmc_regs, BANK) & ATMEL_HSMC_NFC_BANK1)
 343                 return host->nfc->sram_bank0_phys + NFC_SRAM_BANK1_OFFSET;
 344         else
 345                 return host->nfc->sram_bank0_phys;
 346 }
 347
 348 static int atmel_nand_dma_op(struct mtd_info *mtd, void *buf, int len,
 349                                int is_read)
 350 {
 351         struct dma_device *dma_dev;
 352         enum dma_ctrl_flags flags;
 353         dma_addr_t dma_src_addr, dma_dst_addr, phys_addr;
 354         struct dma_async_tx_descriptor *tx = NULL;
 355         dma_cookie_t cookie;
 356         struct nand_chip *chip = mtd_to_nand(mtd);
 357         struct atmel_nand_host *host = nand_get_controller_data(chip);
 358         void *p = buf;
 359         int err = -EIO;
 360         enum dma_data_direction dir = is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 361         struct atmel_nfc *nfc = host->nfc;
 362
 363         if (buf >= high_memory)
 364                 goto err_buf;
 365
 366         dma_dev = host->dma_chan->device;
 367
 368         flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 369
 370         phys_addr = dma_map_single(dma_dev->dev, p, len, dir);
 371         if (dma_mapping_error(dma_dev->dev, phys_addr)) {
 372                 dev_err(host->dev, "Failed to dma_map_single\n");
 373                 goto err_buf;
 374         }
 375
 376         if (is_read) {
 377                 if (nfc && nfc->data_in_sram)
 378                         dma_src_addr = nfc_sram_phys(host) + (nfc->data_in_sram
 379                                 - (nfc->sram_bank0 + nfc_get_sram_off(host)));
 380                 else
 381                         dma_src_addr = host->io_phys;
 382
 383                 dma_dst_addr = phys_addr;
 384         } else {
 385                 dma_src_addr = phys_addr;
 386
 387                 if (nfc && nfc->write_by_sram)
 388                         dma_dst_addr = nfc_sram_phys(host);
 389                 else
 390                         dma_dst_addr = host->io_phys;
 391         }
 392
 393         tx = dma_dev->device_prep_dma_memcpy(host->dma_chan, dma_dst_addr,
 394                                              dma_src_addr, len, flags);
 395         if (!tx) {
 396                 dev_err(host->dev, "Failed to prepare DMA memcpy\n");
 397                 goto err_dma;
 398         }
 399
 400         init_completion(&host->comp);
 401         tx->callback = dma_complete_func;
 402         tx->callback_param = &host->comp;
 403
 404         cookie = tx->tx_submit(tx);
 405         if (dma_submit_error(cookie)) {
 406                 dev_err(host->dev, "Failed to do DMA tx_submit\n");
 407                 goto err_dma;
 408         }
 409
 410         dma_async_issue_pending(host->dma_chan);
 411         wait_for_completion(&host->comp);
 412
 413         if (is_read && nfc && nfc->data_in_sram)
 414                 /* After read data from SRAM, need to increase the position */
 415                 nfc->data_in_sram += len;
 416
 417         err = 0;
 418
 419 err_dma:
 420         dma_unmap_single(dma_dev->dev, phys_addr, len, dir);
 421 err_buf:
 422         if (err != 0)
 423                 dev_dbg(host->dev, "Fall back to CPU I/O\n");
 424         return err;
 425 }
 426
 427 static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 428 {
 429         struct nand_chip *chip = mtd_to_nand(mtd);
 430         struct atmel_nand_host *host = nand_get_controller_data(chip);
 431
 432         if (use_dma && len > mtd->oobsize)
 433                 /* only use DMA for bigger than oob size: better performances */
 434                 if (atmel_nand_dma_op(mtd, buf, len, 1) == 0)
 435                         return;
 436
 437         if (host->board.bus_width_16)
 438                 atmel_read_buf16(mtd, buf, len);
 439         else
 440                 atmel_read_buf8(mtd, buf, len);
 441 }
 442
 443 static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 444 {
 445         struct nand_chip *chip = mtd_to_nand(mtd);
 446         struct atmel_nand_host *host = nand_get_controller_data(chip);
 447
 448         if (use_dma && len > mtd->oobsize)
 449                 /* only use DMA for bigger than oob size: better performances */
 450                 if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) == 0)
 451                         return;
 452
 453         if (host->board.bus_width_16)
 454                 atmel_write_buf16(mtd, buf, len);
 455         else
 456                 atmel_write_buf8(mtd, buf, len);
 457 }
 458
 459 /*
 460  * Return number of ecc bytes per sector according to sector size and
 461  * correction capability
 462  *
 463  * Following table shows what at91 PMECC supported:
 464  * Correction Capability        Sector_512_bytes        Sector_1024_bytes
 465  * =====================        ================        =================
 466  *                2-bits                 4-bytes                  4-bytes
 467  *                4-bits                 7-bytes                  7-bytes
 468  *                8-bits                13-bytes                 14-bytes
 469  *               12-bits                20-bytes                 21-bytes
 470  *               24-bits                39-bytes                 42-bytes
 471  */
 472 static int pmecc_get_ecc_bytes(int cap, int sector_size)
 473 {
 474         int m = 12 + sector_size / 512;
 475         return (m * cap + 7) / 8;
 476 }
 477
 478 static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
 479                                     int oobsize, int ecc_len)
 480 {
 481         int i;
 482
 483         layout->eccbytes = ecc_len;
 484
 485         /* ECC will occupy the last ecc_len bytes continuously */
 486         for (i = 0; i < ecc_len; i++)
 487                 layout->eccpos[i] = oobsize - ecc_len + i;
 488
 489         layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
 490         layout->oobfree[0].length =
 491                 oobsize - ecc_len - layout->oobfree[0].offset;
 492 }
 493
 494 static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
 495 {
 496         int table_size;
 497
 498         table_size = host->pmecc_sector_size == 512 ?
 499                 PMECC_LOOKUP_TABLE_SIZE_512 : PMECC_LOOKUP_TABLE_SIZE_1024;
 500
 501         return host->pmecc_rom_base + host->pmecc_lookup_table_offset +
 502                         table_size * sizeof(int16_t);
 503 }
 504
 505 static int pmecc_data_alloc(struct atmel_nand_host *host)
 506 {
 507         const int cap = host->pmecc_corr_cap;
 508         int size;
 509
 510         size = (2 * cap + 1) * sizeof(int16_t);
 511         host->pmecc_partial_syn = devm_kzalloc(host->dev, size, GFP_KERNEL);
 512         host->pmecc_si = devm_kzalloc(host->dev, size, GFP_KERNEL);
 513         host->pmecc_lmu = devm_kzalloc(host->dev,
 514                         (cap + 1) * sizeof(int16_t), GFP_KERNEL);
 515         host->pmecc_smu = devm_kzalloc(host->dev,
 516                         (cap + 2) * size, GFP_KERNEL);
 517
 518         size = (cap + 1) * sizeof(int);
 519         host->pmecc_mu = devm_kzalloc(host->dev, size, GFP_KERNEL);
 520         host->pmecc_dmu = devm_kzalloc(host->dev, size, GFP_KERNEL);
 521         host->pmecc_delta = devm_kzalloc(host->dev, size, GFP_KERNEL);
 522
 523         if (!host->pmecc_partial_syn ||
 524                 !host->pmecc_si ||
 525                 !host->pmecc_lmu ||
 526                 !host->pmecc_smu ||
 527                 !host->pmecc_mu ||
 528                 !host->pmecc_dmu ||
 529                 !host->pmecc_delta)
 530                 return -ENOMEM;
 531
 532         return 0;
 533 }
 534
 535 static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector)
 536 {
 537         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 538         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 539         int i;
 540         uint32_t value;
 541
 542         /* Fill odd syndromes */
 543         for (i = 0; i < host->pmecc_corr_cap; i++) {
 544                 value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2);
 545                 if (i & 1)
 546                         value >>= 16;
 547                 value &= 0xffff;
 548                 host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value;
 549         }
 550 }
 551
 552 static void pmecc_substitute(struct mtd_info *mtd)
 553 {
 554         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 555         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 556         int16_t __iomem *alpha_to = host->pmecc_alpha_to;
 557         int16_t __iomem *index_of = host->pmecc_index_of;
 558         int16_t *partial_syn = host->pmecc_partial_syn;
 559         const int cap = host->pmecc_corr_cap;
 560         int16_t *si;
 561         int i, j;
 562
 563         /* si[] is a table that holds the current syndrome value,
 564          * an element of that table belongs to the field
 565          */
 566         si = host->pmecc_si;
 567
 568         memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1));
 569
 570         /* Computation 2t syndromes based on S(x) */
 571         /* Odd syndromes */
 572         for (i = 1; i < 2 * cap; i += 2) {
 573                 for (j = 0; j < host->pmecc_degree; j++) {
 574                         if (partial_syn[i] & ((unsigned short)0x1 << j))
 575                                 si[i] = readw_relaxed(alpha_to + i * j) ^ si[i];
 576                 }
 577         }
 578         /* Even syndrome = (Odd syndrome) ** 2 */
 579         for (i = 2, j = 1; j <= cap; i = ++j << 1) {
 580                 if (si[j] == 0) {
 581                         si[i] = 0;
 582                 } else {
 583                         int16_t tmp;
 584
 585                         tmp = readw_relaxed(index_of + si[j]);
 586                         tmp = (tmp * 2) % host->pmecc_cw_len;
 587                         si[i] = readw_relaxed(alpha_to + tmp);
 588                 }
 589         }
 590
 591         return;
 592 }
 593
 594 static void pmecc_get_sigma(struct mtd_info *mtd)
 595 {
 596         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 597         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 598
 599         int16_t *lmu = host->pmecc_lmu;
 600         int16_t *si = host->pmecc_si;
 601         int *mu = host->pmecc_mu;
 602         int *dmu = host->pmecc_dmu;     /* Discrepancy */
 603         int *delta = host->pmecc_delta; /* Delta order */
 604         int cw_len = host->pmecc_cw_len;
 605         const int16_t cap = host->pmecc_corr_cap;
 606         const int num = 2 * cap + 1;
 607         int16_t __iomem *index_of = host->pmecc_index_of;
 608         int16_t __iomem *alpha_to = host->pmecc_alpha_to;
 609         int i, j, k;
 610         uint32_t dmu_0_count, tmp;
 611         int16_t *smu = host->pmecc_smu;
 612
 613         /* index of largest delta */
 614         int ro;
 615         int largest;
 616         int diff;
 617
 618         dmu_0_count = 0;
 619
 620         /* First Row */
 621
 622         /* Mu */
 623         mu[0] = -1;
 624
 625         memset(smu, 0, sizeof(int16_t) * num);
 626         smu[0] = 1;
 627
 628         /* discrepancy set to 1 */
 629         dmu[0] = 1;
 630         /* polynom order set to 0 */
 631         lmu[0] = 0;
 632         delta[0] = (mu[0] * 2 - lmu[0]) >> 1;
 633
 634         /* Second Row */
 635
 636         /* Mu */
 637         mu[1] = 0;
 638         /* Sigma(x) set to 1 */
 639         memset(&smu[num], 0, sizeof(int16_t) * num);
 640         smu[num] = 1;
 641
 642         /* discrepancy set to S1 */
 643         dmu[1] = si[1];
 644
 645         /* polynom order set to 0 */
 646         lmu[1] = 0;
 647
 648         delta[1] = (mu[1] * 2 - lmu[1]) >> 1;
 649
 650         /* Init the Sigma(x) last row */
 651         memset(&smu[(cap + 1) * num], 0, sizeof(int16_t) * num);
 652
 653         for (i = 1; i <= cap; i++) {
 654                 mu[i + 1] = i << 1;
 655                 /* Begin Computing Sigma (Mu+1) and L(mu) */
 656                 /* check if discrepancy is set to 0 */
 657                 if (dmu[i] == 0) {
 658                         dmu_0_count++;
 659
 660                         tmp = ((cap - (lmu[i] >> 1) - 1) / 2);
 661                         if ((cap - (lmu[i] >> 1) - 1) & 0x1)
 662                                 tmp += 2;
 663                         else
 664                                 tmp += 1;
 665
 666                         if (dmu_0_count == tmp) {
 667                                 for (j = 0; j <= (lmu[i] >> 1) + 1; j++)
 668                                         smu[(cap + 1) * num + j] =
 669                                                         smu[i * num + j];
 670
 671                                 lmu[cap + 1] = lmu[i];
 672                                 return;
 673                         }
 674
 675                         /* copy polynom */
 676                         for (j = 0; j <= lmu[i] >> 1; j++)
 677                                 smu[(i + 1) * num + j] = smu[i * num + j];
 678
 679                         /* copy previous polynom order to the next */
 680                         lmu[i + 1] = lmu[i];
 681                 } else {
 682                         ro = 0;
 683                         largest = -1;
 684                         /* find largest delta with dmu != 0 */
 685                         for (j = 0; j < i; j++) {
 686                                 if ((dmu[j]) && (delta[j] > largest)) {
 687                                         largest = delta[j];
 688                                         ro = j;
 689                                 }
 690                         }
 691
 692                         /* compute difference */
 693                         diff = (mu[i] - mu[ro]);
 694
 695                         /* Compute degree of the new smu polynomial */
 696                         if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff))
 697                                 lmu[i + 1] = lmu[i];
 698                         else
 699                                 lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2;
 700
 701                         /* Init smu[i+1] with 0 */
 702                         for (k = 0; k < num; k++)
 703                                 smu[(i + 1) * num + k] = 0;
 704
 705                         /* Compute smu[i+1] */
 706                         for (k = 0; k <= lmu[ro] >> 1; k++) {
 707                                 int16_t a, b, c;
 708
 709                                 if (!(smu[ro * num + k] && dmu[i]))
 710                                         continue;
 711                                 a = readw_relaxed(index_of + dmu[i]);
 712                                 b = readw_relaxed(index_of + dmu[ro]);
 713                                 c = readw_relaxed(index_of + smu[ro * num + k]);
 714                                 tmp = a + (cw_len - b) + c;
 715                                 a = readw_relaxed(alpha_to + tmp % cw_len);
 716                                 smu[(i + 1) * num + (k + diff)] = a;
 717                         }
 718
 719                         for (k = 0; k <= lmu[i] >> 1; k++)
 720                                 smu[(i + 1) * num + k] ^= smu[i * num + k];
 721                 }
 722
 723                 /* End Computing Sigma (Mu+1) and L(mu) */
 724                 /* In either case compute delta */
 725                 delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1;
 726
 727                 /* Do not compute discrepancy for the last iteration */
 728                 if (i >= cap)
 729                         continue;
 730
 731                 for (k = 0; k <= (lmu[i + 1] >> 1); k++) {
 732                         tmp = 2 * (i - 1);
 733                         if (k == 0) {
 734                                 dmu[i + 1] = si[tmp + 3];
 735                         } else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) {
 736                                 int16_t a, b, c;
 737                                 a = readw_relaxed(index_of +
 738                                                 smu[(i + 1) * num + k]);
 739                                 b = si[2 * (i - 1) + 3 - k];
 740                                 c = readw_relaxed(index_of + b);
 741                                 tmp = a + c;
 742                                 tmp %= cw_len;
 743                                 dmu[i + 1] = readw_relaxed(alpha_to + tmp) ^
 744                                         dmu[i + 1];
 745                         }
 746                 }
 747         }
 748
 749         return;
 750 }
 751
 752 static int pmecc_err_location(struct mtd_info *mtd)
 753 {
 754         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 755         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 756         unsigned long end_time;
 757         const int cap = host->pmecc_corr_cap;
 758         const int num = 2 * cap + 1;
 759         int sector_size = host->pmecc_sector_size;
 760         int err_nbr = 0;        /* number of error */
 761         int roots_nbr;          /* number of roots */
 762         int i;
 763         uint32_t val;
 764         int16_t *smu = host->pmecc_smu;
 765
 766         pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE);
 767
 768         for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) {
 769                 pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i,
 770                                       smu[(cap + 1) * num + i]);
 771                 err_nbr++;
 772         }
 773
 774         val = (err_nbr - 1) << 16;
 775         if (sector_size == 1024)
 776                 val |= 1;
 777
 778         pmerrloc_writel(host->pmerrloc_base, ELCFG, val);
 779         pmerrloc_writel(host->pmerrloc_base, ELEN,
 780                         sector_size * 8 + host->pmecc_degree * cap);
 781
 782         end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS);
 783         while (!(pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR)
 784                  & PMERRLOC_CALC_DONE)) {
 785                 if (unlikely(time_after(jiffies, end_time))) {
 786                         dev_err(host->dev, "PMECC: Timeout to calculate error location.\n");
 787                         return -1;
 788                 }
 789                 cpu_relax();
 790         }
 791
 792         roots_nbr = (pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR)
 793                 & PMERRLOC_ERR_NUM_MASK) >> 8;
 794         /* Number of roots == degree of smu hence <= cap */
 795         if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1)
 796                 return err_nbr - 1;
 797
 798         /* Number of roots does not match the degree of smu
 799          * unable to correct error */
 800         return -1;
 801 }
 802
 803 static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 804                 int sector_num, int extra_bytes, int err_nbr)
 805 {
 806         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 807         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 808         int i = 0;
 809         int byte_pos, bit_pos, sector_size, pos;
 810         uint32_t tmp;
 811         uint8_t err_byte;
 812
 813         sector_size = host->pmecc_sector_size;
 814
 815         while (err_nbr) {
 816                 tmp = pmerrloc_readl_el_relaxed(host->pmerrloc_base, i) - 1;
 817                 byte_pos = tmp / 8;
 818                 bit_pos  = tmp % 8;
 819
 820                 if (byte_pos >= (sector_size + extra_bytes))
 821                         BUG();  /* should never happen */
 822
 823                 if (byte_pos < sector_size) {
 824                         err_byte = *(buf + byte_pos);
 825                         *(buf + byte_pos) ^= (1 << bit_pos);
 826
 827                         pos = sector_num * host->pmecc_sector_size + byte_pos;
 828                         dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 829                                 pos, bit_pos, err_byte, *(buf + byte_pos));
 830                 } else {
 831                         /* Bit flip in OOB area */
 832                         tmp = sector_num * nand_chip->ecc.bytes
 833                                         + (byte_pos - sector_size);
 834                         err_byte = ecc[tmp];
 835                         ecc[tmp] ^= (1 << bit_pos);
 836
 837                         pos = tmp + nand_chip->ecc.layout->eccpos[0];
 838                         dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 839                                 pos, bit_pos, err_byte, ecc[tmp]);
 840                 }
 841
 842                 i++;
 843                 err_nbr--;
 844         }
 845
 846         return;
 847 }
 848
 849 static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
 850         u8 *ecc)
 851 {
 852         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 853         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 854         int i, err_nbr;
 855         uint8_t *buf_pos;
 856         int max_bitflips = 0;
 857
 858         /* If can correct bitfilps from erased page, do the normal check */
 859         if (host->caps->pmecc_correct_erase_page)
 860                 goto normal_check;
 861
 862         for (i = 0; i < nand_chip->ecc.total; i++)
 863                 if (ecc[i] != 0xff)
 864                         goto normal_check;
 865         /* Erased page, return OK */
 866         return 0;
 867
 868 normal_check:
 869         for (i = 0; i < nand_chip->ecc.steps; i++) {
 870                 err_nbr = 0;
 871                 if (pmecc_stat & 0x1) {
 872                         buf_pos = buf + i * host->pmecc_sector_size;
 873
 874                         pmecc_gen_syndrome(mtd, i);
 875                         pmecc_substitute(mtd);
 876                         pmecc_get_sigma(mtd);
 877
 878                         err_nbr = pmecc_err_location(mtd);
 879                         if (err_nbr == -1) {
 880                                 dev_err(host->dev, "PMECC: Too many errors\n");
 881                                 mtd->ecc_stats.failed++;
 882                                 return -EIO;
 883                         } else {
 884                                 pmecc_correct_data(mtd, buf_pos, ecc, i,
 885                                         nand_chip->ecc.bytes, err_nbr);
 886                                 mtd->ecc_stats.corrected += err_nbr;
 887                                 max_bitflips = max_t(int, max_bitflips, err_nbr);
 888                         }
 889                 }
 890                 pmecc_stat >>= 1;
 891         }
 892
 893         return max_bitflips;
 894 }
 895
 896 static void pmecc_enable(struct atmel_nand_host *host, int ecc_op)
 897 {
 898         u32 val;
 899
 900         if (ecc_op != NAND_ECC_READ && ecc_op != NAND_ECC_WRITE) {
 901                 dev_err(host->dev, "atmel_nand: wrong pmecc operation type!");
 902                 return;
 903         }
 904
 905         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 906         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
 907         val = pmecc_readl_relaxed(host->ecc, CFG);
 908
 909         if (ecc_op == NAND_ECC_READ)
 910                 pmecc_writel(host->ecc, CFG, (val & ~PMECC_CFG_WRITE_OP)
 911                         | PMECC_CFG_AUTO_ENABLE);
 912         else
 913                 pmecc_writel(host->ecc, CFG, (val | PMECC_CFG_WRITE_OP)
 914                         & ~PMECC_CFG_AUTO_ENABLE);
 915
 916         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
 917         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA);
 918 }
 919
 920 static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 921         struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 922 {
 923         struct atmel_nand_host *host = nand_get_controller_data(chip);
 924         int eccsize = chip->ecc.size * chip->ecc.steps;
 925         uint8_t *oob = chip->oob_poi;
 926         uint32_t *eccpos = chip->ecc.layout->eccpos;
 927         uint32_t stat;
 928         unsigned long end_time;
 929         int bitflips = 0;
 930
 931         if (!host->nfc || !host->nfc->use_nfc_sram)
 932                 pmecc_enable(host, NAND_ECC_READ);
 933
 934         chip->read_buf(mtd, buf, eccsize);
 935         chip->read_buf(mtd, oob, mtd->oobsize);
 936
 937         end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS);
 938         while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) {
 939                 if (unlikely(time_after(jiffies, end_time))) {
 940                         dev_err(host->dev, "PMECC: Timeout to get error status.\n");
 941                         return -EIO;
 942                 }
 943                 cpu_relax();
 944         }
 945
 946         stat = pmecc_readl_relaxed(host->ecc, ISR);
 947         if (stat != 0) {
 948                 bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
 949                 if (bitflips < 0)
 950                         /* uncorrectable errors */
 951                         return 0;
 952         }
 953
 954         return bitflips;
 955 }
 956
 957 static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 958                 struct nand_chip *chip, const uint8_t *buf, int oob_required,
 959                 int page)
 960 {
 961         struct atmel_nand_host *host = nand_get_controller_data(chip);
 962         uint32_t *eccpos = chip->ecc.layout->eccpos;
 963         int i, j;
 964         unsigned long end_time;
 965
 966         if (!host->nfc || !host->nfc->write_by_sram) {
 967                 pmecc_enable(host, NAND_ECC_WRITE);
 968                 chip->write_buf(mtd, (u8 *)buf, mtd->writesize);
 969         }
 970
 971         end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS);
 972         while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) {
 973                 if (unlikely(time_after(jiffies, end_time))) {
 974                         dev_err(host->dev, "PMECC: Timeout to get ECC value.\n");
 975                         return -EIO;
 976                 }
 977                 cpu_relax();
 978         }
 979
 980         for (i = 0; i < chip->ecc.steps; i++) {
 981                 for (j = 0; j < chip->ecc.bytes; j++) {
 982                         int pos;
 983
 984                         pos = i * chip->ecc.bytes + j;
 985                         chip->oob_poi[eccpos[pos]] =
 986                                 pmecc_readb_ecc_relaxed(host->ecc, i, j);
 987                 }
 988         }
 989         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 990
 991         return 0;
 992 }
 993
 994 static void atmel_pmecc_core_init(struct mtd_info *mtd)
 995 {
 996         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 997         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 998         uint32_t val = 0;
 999         struct nand_ecclayout *ecc_layout;
1000
1001         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
1002         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
1003
1004         switch (host->pmecc_corr_cap) {
1005         case 2:
1006                 val = PMECC_CFG_BCH_ERR2;
1007                 break;
1008         case 4:
1009                 val = PMECC_CFG_BCH_ERR4;
1010                 break;
1011         case 8:
1012                 val = PMECC_CFG_BCH_ERR8;
1013                 break;
1014         case 12:
1015                 val = PMECC_CFG_BCH_ERR12;
1016                 break;
1017         case 24:
1018                 val = PMECC_CFG_BCH_ERR24;
1019                 break;
1020         }
1021
1022         if (host->pmecc_sector_size == 512)
1023                 val |= PMECC_CFG_SECTOR512;
1024         else if (host->pmecc_sector_size == 1024)
1025                 val |= PMECC_CFG_SECTOR1024;
1026
1027         switch (nand_chip->ecc.steps) {
1028         case 1:
1029                 val |= PMECC_CFG_PAGE_1SECTOR;
1030                 break;
1031         case 2:
1032                 val |= PMECC_CFG_PAGE_2SECTORS;
1033                 break;
1034         case 4:
1035                 val |= PMECC_CFG_PAGE_4SECTORS;
1036                 break;
1037         case 8:
1038                 val |= PMECC_CFG_PAGE_8SECTORS;
1039                 break;
1040         }
1041
1042         val |= (PMECC_CFG_READ_OP | PMECC_CFG_SPARE_DISABLE
1043                 | PMECC_CFG_AUTO_DISABLE);
1044         pmecc_writel(host->ecc, CFG, val);
1045
1046         ecc_layout = nand_chip->ecc.layout;
1047         pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
1048         pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
1049         pmecc_writel(host->ecc, EADDR,
1050                         ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
1051         /* See datasheet about PMECC Clock Control Register */
1052         pmecc_writel(host->ecc, CLK, 2);
1053         pmecc_writel(host->ecc, IDR, 0xff);
1054         pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE);
1055 }
1056
1057 /*
1058  * Get minimum ecc requirements from NAND.
1059  * If pmecc-cap, pmecc-sector-size in DTS are not specified, this function
1060  * will set them according to minimum ecc requirement. Otherwise, use the
1061  * value in DTS file.
1062  * return 0 if success. otherwise return error code.
1063  */
1064 static int pmecc_choose_ecc(struct atmel_nand_host *host,
1065                 int *cap, int *sector_size)
1066 {
1067         /* Get minimum ECC requirements */
1068         if (host->nand_chip.ecc_strength_ds) {
1069                 *cap = host->nand_chip.ecc_strength_ds;
1070                 *sector_size = host->nand_chip.ecc_step_ds;
1071                 dev_info(host->dev, "minimum ECC: %d bits in %d bytes\n",
1072                                 *cap, *sector_size);
1073         } else {
1074                 *cap = 2;
1075                 *sector_size = 512;
1076                 dev_info(host->dev, "can't detect min. ECC, assume 2 bits in 512 bytes\n");
1077         }
1078
1079         /* If device tree doesn't specify, use NAND's minimum ECC parameters */
1080         if (host->pmecc_corr_cap == 0) {
1081                 /* use the most fitable ecc bits (the near bigger one ) */
1082                 if (*cap <= 2)
1083                         host->pmecc_corr_cap = 2;
1084                 else if (*cap <= 4)
1085                         host->pmecc_corr_cap = 4;
1086                 else if (*cap <= 8)
1087                         host->pmecc_corr_cap = 8;
1088                 else if (*cap <= 12)
1089                         host->pmecc_corr_cap = 12;
1090                 else if (*cap <= 24)
1091                         host->pmecc_corr_cap = 24;
1092                 else
1093                         return -EINVAL;
1094         }
1095         if (host->pmecc_sector_size == 0) {
1096                 /* use the most fitable sector size (the near smaller one ) */
1097                 if (*sector_size >= 1024)
1098                         host->pmecc_sector_size = 1024;
1099                 else if (*sector_size >= 512)
1100                         host->pmecc_sector_size = 512;
1101                 else
1102                         return -EINVAL;
1103         }
1104         return 0;
1105 }
1106
1107 static inline int deg(unsigned int poly)
1108 {
1109         /* polynomial degree is the most-significant bit index */
1110         return fls(poly) - 1;
1111 }
1112
1113 static int build_gf_tables(int mm, unsigned int poly,
1114                 int16_t *index_of, int16_t *alpha_to)
1115 {
1116         unsigned int i, x = 1;
1117         const unsigned int k = 1 << deg(poly);
1118         unsigned int nn = (1 << mm) - 1;
1119
1120         /* primitive polynomial must be of degree m */
1121         if (k != (1u << mm))
1122                 return -EINVAL;
1123
1124         for (i = 0; i < nn; i++) {
1125                 alpha_to[i] = x;
1126                 index_of[x] = i;
1127                 if (i && (x == 1))
1128                         /* polynomial is not primitive (a^i=1 with 0<i<2^m-1) */
1129                         return -EINVAL;
1130                 x <<= 1;
1131                 if (x & k)
1132                         x ^= poly;
1133         }
1134         alpha_to[nn] = 1;
1135         index_of[0] = 0;
1136
1137         return 0;
1138 }
1139
1140 static uint16_t *create_lookup_table(struct device *dev, int sector_size)
1141 {
1142         int degree = (sector_size == 512) ?
1143                         PMECC_GF_DIMENSION_13 :
1144                         PMECC_GF_DIMENSION_14;
1145         unsigned int poly = (sector_size == 512) ?
1146                         PMECC_GF_13_PRIMITIVE_POLY :
1147                         PMECC_GF_14_PRIMITIVE_POLY;
1148         int table_size = (sector_size == 512) ?
1149                         PMECC_LOOKUP_TABLE_SIZE_512 :
1150                         PMECC_LOOKUP_TABLE_SIZE_1024;
1151
1152         int16_t *addr = devm_kzalloc(dev, 2 * table_size * sizeof(uint16_t),
1153                         GFP_KERNEL);
1154         if (addr && build_gf_tables(degree, poly, addr, addr + table_size))
1155                 return NULL;
1156
1157         return addr;
1158 }
1159
1160 static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
1161                                          struct atmel_nand_host *host)
1162 {
1163         struct nand_chip *nand_chip = &host->nand_chip;
1164         struct mtd_info *mtd = nand_to_mtd(nand_chip);
1165         struct resource *regs, *regs_pmerr, *regs_rom;
1166         uint16_t *galois_table;
1167         int cap, sector_size, err_no;
1168
1169         err_no = pmecc_choose_ecc(host, &cap, &sector_size);
1170         if (err_no) {
1171                 dev_err(host->dev, "The NAND flash's ECC requirement are not support!");
1172                 return err_no;
1173         }
1174
1175         if (cap > host->pmecc_corr_cap ||
1176                         sector_size != host->pmecc_sector_size)
1177                 dev_info(host->dev, "WARNING: Be Caution! Using different PMECC parameters from Nand ONFI ECC reqirement.\n");
1178
1179         cap = host->pmecc_corr_cap;
1180         sector_size = host->pmecc_sector_size;
1181         host->pmecc_lookup_table_offset = (sector_size == 512) ?
1182                         host->pmecc_lookup_table_offset_512 :
1183                         host->pmecc_lookup_table_offset_1024;
1184
1185         dev_info(host->dev, "Initialize PMECC params, cap: %d, sector: %d\n",
1186                  cap, sector_size);
1187
1188         regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1189         if (!regs) {
1190                 dev_warn(host->dev,
1191                         "Can't get I/O resource regs for PMECC controller, rolling back on software ECC\n");
1192                 nand_chip->ecc.mode = NAND_ECC_SOFT;
1193                 return 0;
1194         }
1195
1196         host->ecc = devm_ioremap_resource(&pdev->dev, regs);
1197         if (IS_ERR(host->ecc)) {
1198                 err_no = PTR_ERR(host->ecc);
1199                 goto err;
1200         }
1201
1202         regs_pmerr = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1203         host->pmerrloc_base = devm_ioremap_resource(&pdev->dev, regs_pmerr);
1204         if (IS_ERR(host->pmerrloc_base)) {
1205                 err_no = PTR_ERR(host->pmerrloc_base);
1206                 goto err;
1207         }
1208
1209         if (!host->has_no_lookup_table) {
1210                 regs_rom = platform_get_resource(pdev, IORESOURCE_MEM, 3);
1211                 host->pmecc_rom_base = devm_ioremap_resource(&pdev->dev,
1212                                                                 regs_rom);
1213                 if (IS_ERR(host->pmecc_rom_base)) {
1214                         dev_err(host->dev, "Can not get I/O resource for ROM, will build a lookup table in runtime!\n");
1215                         host->has_no_lookup_table = true;
1216                 }
1217         }
1218
1219         if (host->has_no_lookup_table) {
1220                 /* Build the look-up table in runtime */
1221                 galois_table = create_lookup_table(host->dev, sector_size);
1222                 if (!galois_table) {
1223                         dev_err(host->dev, "Failed to build a lookup table in runtime!\n");
1224                         err_no = -EINVAL;
1225                         goto err;
1226                 }
1227
1228                 host->pmecc_rom_base = (void __iomem *)galois_table;
1229                 host->pmecc_lookup_table_offset = 0;
1230         }
1231
1232         nand_chip->ecc.size = sector_size;
1233
1234         /* set ECC page size and oob layout */
1235         switch (mtd->writesize) {
1236         case 512:
1237         case 1024:
1238         case 2048:
1239         case 4096:
1240         case 8192:
1241                 if (sector_size > mtd->writesize) {
1242                         dev_err(host->dev, "pmecc sector size is bigger than the page size!\n");
1243                         err_no = -EINVAL;
1244                         goto err;
1245                 }
1246
1247                 host->pmecc_degree = (sector_size == 512) ?
1248                         PMECC_GF_DIMENSION_13 : PMECC_GF_DIMENSION_14;
1249                 host->pmecc_cw_len = (1 << host->pmecc_degree) - 1;
1250                 host->pmecc_alpha_to = pmecc_get_alpha_to(host);
1251                 host->pmecc_index_of = host->pmecc_rom_base +
1252                         host->pmecc_lookup_table_offset;
1253
1254                 nand_chip->ecc.strength = cap;
1255                 nand_chip->ecc.bytes = pmecc_get_ecc_bytes(cap, sector_size);
1256                 nand_chip->ecc.steps = mtd->writesize / sector_size;
1257                 nand_chip->ecc.total = nand_chip->ecc.bytes *
1258                         nand_chip->ecc.steps;
1259                 if (nand_chip->ecc.total >
1260                                 mtd->oobsize - PMECC_OOB_RESERVED_BYTES) {
1261                         dev_err(host->dev, "No room for ECC bytes\n");
1262                         err_no = -EINVAL;
1263                         goto err;
1264                 }
1265                 pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
1266                                         mtd->oobsize,
1267                                         nand_chip->ecc.total);
1268
1269                 nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
1270                 break;
1271         default:
1272                 dev_warn(host->dev,
1273                         "Unsupported page size for PMECC, use Software ECC\n");
1274                 /* page size not handled by HW ECC */
1275                 /* switching back to soft ECC */
1276                 nand_chip->ecc.mode = NAND_ECC_SOFT;
1277                 return 0;
1278         }
1279
1280         /* Allocate data for PMECC computation */
1281         err_no = pmecc_data_alloc(host);
1282         if (err_no) {
1283                 dev_err(host->dev,
1284                                 "Cannot allocate memory for PMECC computation!\n");
1285                 goto err;
1286         }
1287
1288         nand_chip->options |= NAND_NO_SUBPAGE_WRITE;
1289         nand_chip->ecc.read_page = atmel_nand_pmecc_read_page;
1290         nand_chip->ecc.write_page = atmel_nand_pmecc_write_page;
1291
1292         atmel_pmecc_core_init(mtd);
1293
1294         return 0;
1295
1296 err:
1297         return err_no;
1298 }
1299
1300 /*
1301  * Calculate HW ECC
1302  *
1303  * function called after a write
1304  *
1305  * mtd:        MTD block structure
1306  * dat:        raw data (unused)
1307  * ecc_code:   buffer for ECC
1308  */
1309 static int atmel_nand_calculate(struct mtd_info *mtd,
1310                 const u_char *dat, unsigned char *ecc_code)
1311 {
1312         struct nand_chip *nand_chip = mtd_to_nand(mtd);
1313         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
1314         unsigned int ecc_value;
1315
1316         /* get the first 2 ECC bytes */
1317         ecc_value = ecc_readl(host->ecc, PR);
1318
1319         ecc_code[0] = ecc_value & 0xFF;
1320         ecc_code[1] = (ecc_value >> 8) & 0xFF;
1321
1322         /* get the last 2 ECC bytes */
1323         ecc_value = ecc_readl(host->ecc, NPR) & ATMEL_ECC_NPARITY;
1324
1325         ecc_code[2] = ecc_value & 0xFF;
1326         ecc_code[3] = (ecc_value >> 8) & 0xFF;
1327
1328         return 0;
1329 }
1330
1331 /*
1332  * HW ECC read page function
1333  *
1334  * mtd:        mtd info structure
1335  * chip:       nand chip info structure
1336  * buf:        buffer to store read data
1337  * oob_required:    caller expects OOB data read to chip->oob_poi
1338  */
1339 static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
1340                                 uint8_t *buf, int oob_required, int page)
1341 {
1342         int eccsize = chip->ecc.size;
1343         int eccbytes = chip->ecc.bytes;
1344         uint32_t *eccpos = chip->ecc.layout->eccpos;
1345         uint8_t *p = buf;
1346         uint8_t *oob = chip->oob_poi;
1347         uint8_t *ecc_pos;
1348         int stat;
1349         unsigned int max_bitflips = 0;
1350
1351         /*
1352          * Errata: ALE is incorrectly wired up to the ECC controller
1353          * on the AP7000, so it will include the address cycles in the
1354          * ECC calculation.
1355          *
1356          * Workaround: Reset the parity registers before reading the
1357          * actual data.
1358          */
1359         struct atmel_nand_host *host = nand_get_controller_data(chip);
1360         if (host->board.need_reset_workaround)
1361                 ecc_writel(host->ecc, CR, ATMEL_ECC_RST);
1362
1363         /* read the page */
1364         chip->read_buf(mtd, p, eccsize);
1365
1366         /* move to ECC position if needed */
1367         if (eccpos[0] != 0) {
1368                 /* This only works on large pages
1369                  * because the ECC controller waits for
1370                  * NAND_CMD_RNDOUTSTART after the
1371                  * NAND_CMD_RNDOUT.
1372                  * anyway, for small pages, the eccpos[0] == 0
1373                  */
1374                 chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
1375                                 mtd->writesize + eccpos[0], -1);
1376         }
1377
1378         /* the ECC controller needs to read the ECC just after the data */
1379         ecc_pos = oob + eccpos[0];
1380         chip->read_buf(mtd, ecc_pos, eccbytes);
1381
1382         /* check if there's an error */
1383         stat = chip->ecc.correct(mtd, p, oob, NULL);
1384
1385         if (stat < 0) {
1386                 mtd->ecc_stats.failed++;
1387         } else {
1388                 mtd->ecc_stats.corrected += stat;
1389                 max_bitflips = max_t(unsigned int, max_bitflips, stat);
1390         }
1391
1392         /* get back to oob start (end of page) */
1393         chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
1394
1395         /* read the oob */
1396         chip->read_buf(mtd, oob, mtd->oobsize);
1397
1398         return max_bitflips;
1399 }
1400
1401 /*
1402  * HW ECC Correction
1403  *
1404  * function called after a read
1405  *
1406  * mtd:        MTD block structure
1407  * dat:        raw data read from the chip
1408  * read_ecc:   ECC from the chip (unused)
1409  * isnull:     unused
1410  *
1411  * Detect and correct a 1 bit error for a page
1412  */
1413 static int atmel_nand_correct(struct mtd_info *mtd, u_char *dat,
1414                 u_char *read_ecc, u_char *isnull)
1415 {
1416         struct nand_chip *nand_chip = mtd_to_nand(mtd);
1417         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
1418         unsigned int ecc_status;
1419         unsigned int ecc_word, ecc_bit;
1420
1421         /* get the status from the Status Register */
1422         ecc_status = ecc_readl(host->ecc, SR);
1423
1424         /* if there's no error */
1425         if (likely(!(ecc_status & ATMEL_ECC_RECERR)))
1426                 return 0;
1427
1428         /* get error bit offset (4 bits) */
1429         ecc_bit = ecc_readl(host->ecc, PR) & ATMEL_ECC_BITADDR;
1430         /* get word address (12 bits) */
1431         ecc_word = ecc_readl(host->ecc, PR) & ATMEL_ECC_WORDADDR;
1432         ecc_word >>= 4;
1433
1434         /* if there are multiple errors */
1435         if (ecc_status & ATMEL_ECC_MULERR) {
1436                 /* check if it is a freshly erased block
1437                  * (filled with 0xff) */
1438                 if ((ecc_bit == ATMEL_ECC_BITADDR)
1439                                 && (ecc_word == (ATMEL_ECC_WORDADDR >> 4))) {
1440                         /* the block has just been erased, return OK */
1441                         return 0;
1442                 }
1443                 /* it doesn't seems to be a freshly
1444                  * erased block.
1445                  * We can't correct so many errors */
1446                 dev_dbg(host->dev, "atmel_nand : multiple errors detected."
1447                                 " Unable to correct.\n");
1448                 return -EBADMSG;
1449         }
1450
1451         /* if there's a single bit error : we can correct it */
1452         if (ecc_status & ATMEL_ECC_ECCERR) {
1453                 /* there's nothing much to do here.
1454                  * the bit error is on the ECC itself.
1455                  */
1456                 dev_dbg(host->dev, "atmel_nand : one bit error on ECC code."
1457                                 " Nothing to correct\n");
1458                 return 0;
1459         }
1460
1461         dev_dbg(host->dev, "atmel_nand : one bit error on data."
1462                         " (word offset in the page :"
1463                         " 0x%x bit offset : 0x%x)\n",
1464                         ecc_word, ecc_bit);
1465         /* correct the error */
1466         if (nand_chip->options & NAND_BUSWIDTH_16) {
1467                 /* 16 bits words */
1468                 ((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit);
1469         } else {
1470                 /* 8 bits words */
1471                 dat[ecc_word] ^= (1 << ecc_bit);
1472         }
1473         dev_dbg(host->dev, "atmel_nand : error corrected\n");
1474         return 1;
1475 }
1476
1477 /*
1478  * Enable HW ECC : unused on most chips
1479  */
1480 static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
1481 {
1482         struct nand_chip *nand_chip = mtd_to_nand(mtd);
1483         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
1484
1485         if (host->board.need_reset_workaround)
1486                 ecc_writel(host->ecc, CR, ATMEL_ECC_RST);
1487 }
1488
1489 static int atmel_of_init_port(struct atmel_nand_host *host,
1490                               struct device_node *np)
1491 {
1492         u32 val;
1493         u32 offset[2];
1494         int ecc_mode;
1495         struct atmel_nand_data *board = &host->board;
1496         enum of_gpio_flags flags = 0;
1497
1498         host->caps = (struct atmel_nand_caps *)
1499                 of_device_get_match_data(host->dev);
1500
1501         if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
1502                 if (val >= 32) {
1503                         dev_err(host->dev, "invalid addr-offset %u\n", val);
1504                         return -EINVAL;
1505                 }
1506                 board->ale = val;
1507         }
1508
1509         if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) {
1510                 if (val >= 32) {
1511                         dev_err(host->dev, "invalid cmd-offset %u\n", val);
1512                         return -EINVAL;
1513                 }
1514                 board->cle = val;
1515         }
1516
1517         ecc_mode = of_get_nand_ecc_mode(np);
1518
1519         board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode;
1520
1521         board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
1522
1523         board->has_dma = of_property_read_bool(np, "atmel,nand-has-dma");
1524
1525         if (of_get_nand_bus_width(np) == 16)
1526                 board->bus_width_16 = 1;
1527
1528         board->rdy_pin = of_get_gpio_flags(np, 0, &flags);
1529         board->rdy_pin_active_low = (flags == OF_GPIO_ACTIVE_LOW);
1530
1531         board->enable_pin = of_get_gpio(np, 1);
1532         board->det_pin = of_get_gpio(np, 2);
1533
1534         host->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc");
1535
1536         /* load the nfc driver if there is */
1537         of_platform_populate(np, NULL, NULL, host->dev);
1538
1539         if (!(board->ecc_mode == NAND_ECC_HW) || !host->has_pmecc)
1540                 return 0;       /* Not using PMECC */
1541
1542         /* use PMECC, get correction capability, sector size and lookup
1543          * table offset.
1544          * If correction bits and sector size are not specified, then find
1545          * them from NAND ONFI parameters.
1546          */
1547         if (of_property_read_u32(np, "atmel,pmecc-cap", &val) == 0) {
1548                 if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
1549                                 (val != 24)) {
1550                         dev_err(host->dev,
1551                                 "Required ECC strength not supported: %u\n",
1552                                 val);
1553                         return -EINVAL;
1554                 }
1555                 host->pmecc_corr_cap = (u8)val;
1556         }
1557
1558         if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) == 0) {
1559                 if ((val != 512) && (val != 1024)) {
1560                         dev_err(host->dev,
1561                                 "Required ECC sector size not supported: %u\n",
1562                                 val);
1563                         return -EINVAL;
1564                 }
1565                 host->pmecc_sector_size = (u16)val;
1566         }
1567
1568         if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset",
1569                         offset, 2) != 0) {
1570                 dev_err(host->dev, "Cannot get PMECC lookup table offset, will build a lookup table in runtime.\n");
1571                 host->has_no_lookup_table = true;
1572                 /* Will build a lookup table and initialize the offset later */
1573                 return 0;
1574         }
1575         if (!offset[0] && !offset[1]) {
1576                 dev_err(host->dev, "Invalid PMECC lookup table offset\n");
1577                 return -EINVAL;
1578         }
1579         host->pmecc_lookup_table_offset_512 = offset[0];
1580         host->pmecc_lookup_table_offset_1024 = offset[1];
1581
1582         return 0;
1583 }
1584
1585 static int atmel_hw_nand_init_params(struct platform_device *pdev,
1586                                          struct atmel_nand_host *host)
1587 {
1588         struct nand_chip *nand_chip = &host->nand_chip;
1589         struct mtd_info *mtd = nand_to_mtd(nand_chip);
1590         struct resource         *regs;
1591
1592         regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1593         if (!regs) {
1594                 dev_err(host->dev,
1595                         "Can't get I/O resource regs, use software ECC\n");
1596                 nand_chip->ecc.mode = NAND_ECC_SOFT;
1597                 return 0;
1598         }
1599
1600         host->ecc = devm_ioremap_resource(&pdev->dev, regs);
1601         if (IS_ERR(host->ecc))
1602                 return PTR_ERR(host->ecc);
1603
1604         /* ECC is calculated for the whole page (1 step) */
1605         nand_chip->ecc.size = mtd->writesize;
1606
1607         /* set ECC page size and oob layout */
1608         switch (mtd->writesize) {
1609         case 512:
1610                 nand_chip->ecc.layout = &atmel_oobinfo_small;
1611                 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
1612                 break;
1613         case 1024:
1614                 nand_chip->ecc.layout = &atmel_oobinfo_large;
1615                 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
1616                 break;
1617         case 2048:
1618                 nand_chip->ecc.layout = &atmel_oobinfo_large;
1619                 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
1620                 break;
1621         case 4096:
1622                 nand_chip->ecc.layout = &atmel_oobinfo_large;
1623                 ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
1624                 break;
1625         default:
1626                 /* page size not handled by HW ECC */
1627                 /* switching back to soft ECC */
1628                 nand_chip->ecc.mode = NAND_ECC_SOFT;
1629                 return 0;
1630         }
1631
1632         /* set up for HW ECC */
1633         nand_chip->ecc.calculate = atmel_nand_calculate;
1634         nand_chip->ecc.correct = atmel_nand_correct;
1635         nand_chip->ecc.hwctl = atmel_nand_hwctl;
1636         nand_chip->ecc.read_page = atmel_nand_read_page;
1637         nand_chip->ecc.bytes = 4;
1638         nand_chip->ecc.strength = 1;
1639
1640         return 0;
1641 }
1642
1643 static inline u32 nfc_read_status(struct atmel_nand_host *host)
1644 {
1645         u32 err_flags = NFC_SR_DTOE | NFC_SR_UNDEF | NFC_SR_AWB | NFC_SR_ASE;
1646         u32 nfc_status = nfc_readl(host->nfc->hsmc_regs, SR);
1647
1648         if (unlikely(nfc_status & err_flags)) {
1649                 if (nfc_status & NFC_SR_DTOE)
1650                         dev_err(host->dev, "NFC: Waiting Nand R/B Timeout Error\n");
1651                 else if (nfc_status & NFC_SR_UNDEF)
1652                         dev_err(host->dev, "NFC: Access Undefined Area Error\n");
1653                 else if (nfc_status & NFC_SR_AWB)
1654                         dev_err(host->dev, "NFC: Access memory While NFC is busy\n");
1655                 else if (nfc_status & NFC_SR_ASE)
1656                         dev_err(host->dev, "NFC: Access memory Size Error\n");
1657         }
1658
1659         return nfc_status;
1660 }
1661
1662 /* SMC interrupt service routine */
1663 static irqreturn_t hsmc_interrupt(int irq, void *dev_id)
1664 {
1665         struct atmel_nand_host *host = dev_id;
1666         u32 status, mask, pending;
1667         irqreturn_t ret = IRQ_NONE;
1668
1669         status = nfc_read_status(host);
1670         mask = nfc_readl(host->nfc->hsmc_regs, IMR);
1671         pending = status & mask;
1672
1673         if (pending & NFC_SR_XFR_DONE) {
1674                 complete(&host->nfc->comp_xfer_done);
1675                 nfc_writel(host->nfc->hsmc_regs, IDR, NFC_SR_XFR_DONE);
1676                 ret = IRQ_HANDLED;
1677         }
1678         if (pending & NFC_SR_RB_EDGE) {
1679                 complete(&host->nfc->comp_ready);
1680                 nfc_writel(host->nfc->hsmc_regs, IDR, NFC_SR_RB_EDGE);
1681                 ret = IRQ_HANDLED;
1682         }
1683         if (pending & NFC_SR_CMD_DONE) {
1684                 complete(&host->nfc->comp_cmd_done);
1685                 nfc_writel(host->nfc->hsmc_regs, IDR, NFC_SR_CMD_DONE);
1686                 ret = IRQ_HANDLED;
1687         }
1688
1689         return ret;
1690 }
1691
1692 /* NFC(Nand Flash Controller) related functions */
1693 static void nfc_prepare_interrupt(struct atmel_nand_host *host, u32 flag)
1694 {
1695         if (flag & NFC_SR_XFR_DONE)
1696                 init_completion(&host->nfc->comp_xfer_done);
1697
1698         if (flag & NFC_SR_RB_EDGE)
1699                 init_completion(&host->nfc->comp_ready);
1700
1701         if (flag & NFC_SR_CMD_DONE)
1702                 init_completion(&host->nfc->comp_cmd_done);
1703
1704         /* Enable interrupt that need to wait for */
1705         nfc_writel(host->nfc->hsmc_regs, IER, flag);
1706 }
1707
1708 static int nfc_wait_interrupt(struct atmel_nand_host *host, u32 flag)
1709 {
1710         int i, index = 0;
1711         struct completion *comp[3];     /* Support 3 interrupt completion */
1712
1713         if (flag & NFC_SR_XFR_DONE)
1714                 comp[index++] = &host->nfc->comp_xfer_done;
1715
1716         if (flag & NFC_SR_RB_EDGE)
1717                 comp[index++] = &host->nfc->comp_ready;
1718
1719         if (flag & NFC_SR_CMD_DONE)
1720                 comp[index++] = &host->nfc->comp_cmd_done;
1721
1722         if (index == 0) {
1723                 dev_err(host->dev, "Unknown interrupt flag: 0x%08x\n", flag);
1724                 return -EINVAL;
1725         }
1726
1727         for (i = 0; i < index; i++) {
1728                 if (wait_for_completion_timeout(comp[i],
1729                                 msecs_to_jiffies(NFC_TIME_OUT_MS)))
1730                         continue;       /* wait for next completion */
1731                 else
1732                         goto err_timeout;
1733         }
1734
1735         return 0;
1736
1737 err_timeout:
1738         dev_err(host->dev, "Time out to wait for interrupt: 0x%08x\n", flag);
1739         /* Disable the interrupt as it is not handled by interrupt handler */
1740         nfc_writel(host->nfc->hsmc_regs, IDR, flag);
1741         return -ETIMEDOUT;
1742 }
1743
1744 static int nfc_send_command(struct atmel_nand_host *host,
1745         unsigned int cmd, unsigned int addr, unsigned char cycle0)
1746 {
1747         unsigned long timeout;
1748         u32 flag = NFC_SR_CMD_DONE;
1749         flag |= cmd & NFCADDR_CMD_DATAEN ? NFC_SR_XFR_DONE : 0;
1750
1751         dev_dbg(host->dev,
1752                 "nfc_cmd: 0x%08x, addr1234: 0x%08x, cycle0: 0x%02x\n",
1753                 cmd, addr, cycle0);
1754
1755         timeout = jiffies + msecs_to_jiffies(NFC_TIME_OUT_MS);
1756         while (nfc_readl(host->nfc->hsmc_regs, SR) & NFC_SR_BUSY) {
1757                 if (time_after(jiffies, timeout)) {
1758                         dev_err(host->dev,
1759                                 "Time out to wait for NFC ready!\n");
1760                         return -ETIMEDOUT;
1761                 }
1762         }
1763
1764         nfc_prepare_interrupt(host, flag);
1765         nfc_writel(host->nfc->hsmc_regs, CYCLE0, cycle0);
1766         nfc_cmd_addr1234_writel(cmd, addr, host->nfc->base_cmd_regs);
1767         return nfc_wait_interrupt(host, flag);
1768 }
1769
1770 static int nfc_device_ready(struct mtd_info *mtd)
1771 {
1772         u32 status, mask;
1773         struct nand_chip *nand_chip = mtd_to_nand(mtd);
1774         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
1775
1776         status = nfc_read_status(host);
1777         mask = nfc_readl(host->nfc->hsmc_regs, IMR);
1778
1779         /* The mask should be 0. If not we may lost interrupts */
1780         if (unlikely(mask & status))
1781                 dev_err(host->dev, "Lost the interrupt flags: 0x%08x\n",
1782                                 mask & status);
1783
1784         return status & NFC_SR_RB_EDGE;
1785 }
1786
1787 static void nfc_select_chip(struct mtd_info *mtd, int chip)
1788 {
1789         struct nand_chip *nand_chip = mtd_to_nand(mtd);
1790         struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
1791
1792         if (chip == -1)
1793                 nfc_writel(host->nfc->hsmc_regs, CTRL, NFC_CTRL_DISABLE);
1794         else
1795                 nfc_writel(host->nfc->hsmc_regs, CTRL, NFC_CTRL_ENABLE);
1796 }
1797
1798 static int nfc_make_addr(struct mtd_info *mtd, int command, int column,
1799                 int page_addr, unsigned int *addr1234, unsigned int *cycle0)
1800 {
1801         struct nand_chip *chip = mtd_to_nand(mtd);
1802
1803         int acycle = 0;
1804         unsigned char addr_bytes[8];
1805         int index = 0, bit_shift;
1806
1807         BUG_ON(addr1234 == NULL || cycle0 == NULL);
1808
1809         *cycle0 = 0;
1810         *addr1234 = 0;
1811
1812         if (column != -1) {
1813                 if (chip->options & NAND_BUSWIDTH_16 &&
1814                                 !nand_opcode_8bits(command))
1815                         column >>= 1;
1816                 addr_bytes[acycle++] = column & 0xff;
1817                 if (mtd->writesize > 512)
1818                         addr_bytes[acycle++] = (column >> 8) & 0xff;
1819         }
1820
1821         if (page_addr != -1) {
1822                 addr_bytes[acycle++] = page_addr & 0xff;
1823                 addr_bytes[acycle++] = (page_addr >> 8) & 0xff;
1824                 if (chip->chipsize > (128 << 20))
1825                         addr_bytes[acycle++] = (page_addr >> 16) & 0xff;
1826         }
1827
1828         if (acycle > 4)
1829                 *cycle0 = addr_bytes[index++];
1830
1831         for (bit_shift = 0; index < acycle; bit_shift += 8)
1832                 *addr1234 += addr_bytes[index++] << bit_shift;
1833
1834         /* return acycle in cmd register */
1835         return acycle << NFCADDR_CMD_ACYCLE_BIT_POS;
1836 }
1837
1838 static void nfc_nand_command(struct mtd_info *mtd, unsigned int command,
1839                                 int column, int page_addr)
1840 {
1841         struct nand_chip *chip = mtd_to_nand(mtd);
1842         struct atmel_nand_host *host = nand_get_controller_data(chip);
1843         unsigned long timeout;
1844         unsigned int nfc_addr_cmd = 0;
1845
1846         unsigned int cmd1 = command << NFCADDR_CMD_CMD1_BIT_POS;
1847
1848         /* Set default settings: no cmd2, no addr cycle. read from nand */
1849         unsigned int cmd2 = 0;
1850         unsigned int vcmd2 = 0;
1851         int acycle = NFCADDR_CMD_ACYCLE_NONE;
1852         int csid = NFCADDR_CMD_CSID_3;
1853         int dataen = NFCADDR_CMD_DATADIS;
1854         int nfcwr = NFCADDR_CMD_NFCRD;
1855         unsigned int addr1234 = 0;
1856         unsigned int cycle0 = 0;
1857         bool do_addr = true;
1858         host->nfc->data_in_sram = NULL;
1859
1860         dev_dbg(host->dev, "%s: cmd = 0x%02x, col = 0x%08x, page = 0x%08x\n",
1861              __func__, command, column, page_addr);
1862
1863         switch (command) {
1864         case NAND_CMD_RESET:
1865                 nfc_addr_cmd = cmd1 | acycle | csid | dataen | nfcwr;
1866                 nfc_send_command(host, nfc_addr_cmd, addr1234, cycle0);
1867                 udelay(chip->chip_delay);
1868
1869                 nfc_nand_command(mtd, NAND_CMD_STATUS, -1, -1);
1870                 timeout = jiffies + msecs_to_jiffies(NFC_TIME_OUT_MS);
1871                 while (!(chip->read_byte(mtd) & NAND_STATUS_READY)) {
1872                         if (time_after(jiffies, timeout)) {
1873                                 dev_err(host->dev,
1874                                         "Time out to wait status ready!\n");
1875                                 break;
1876                         }
1877                 }
1878                 return;
1879         case NAND_CMD_STATUS:
1880                 do_addr = false;
1881                 break;
1882         case NAND_CMD_PARAM:
1883         case NAND_CMD_READID:
1884                 do_addr = false;
1885                 acycle = NFCADDR_CMD_ACYCLE_1;
1886                 if (column != -1)
1887                         addr1234 = column;
1888                 break;
1889         case NAND_CMD_RNDOUT:
1890                 cmd2 = NAND_CMD_RNDOUTSTART << NFCADDR_CMD_CMD2_BIT_POS;
1891                 vcmd2 = NFCADDR_CMD_VCMD2;
1892                 break;
1893         case NAND_CMD_READ0:
1894         case NAND_CMD_READOOB:
1895                 if (command == NAND_CMD_READOOB) {
1896                         column += mtd->writesize;
1897                         command = NAND_CMD_READ0; /* only READ0 is valid */
1898                         cmd1 = command << NFCADDR_CMD_CMD1_BIT_POS;
1899                 }
1900                 if (host->nfc->use_nfc_sram) {
1901                         /* Enable Data transfer to sram */
1902                         dataen = NFCADDR_CMD_DATAEN;
1903
1904                         /* Need enable PMECC now, since NFC will transfer
1905                          * data in bus after sending nfc read command.
1906                          */
1907                         if (chip->ecc.mode == NAND_ECC_HW && host->has_pmecc)
1908                                 pmecc_enable(host, NAND_ECC_READ);
1909                 }
1910
1911                 cmd2 = NAND_CMD_READSTART << NFCADDR_CMD_CMD2_BIT_POS;
1912                 vcmd2 = NFCADDR_CMD_VCMD2;
1913                 break;
1914         /* For prgramming command, the cmd need set to write enable */
1915         case NAND_CMD_PAGEPROG:
1916         case NAND_CMD_SEQIN:
1917         case NAND_CMD_RNDIN:
1918                 nfcwr = NFCADDR_CMD_NFCWR;
1919                 if (host->nfc->will_write_sram && command == NAND_CMD_SEQIN)
1920                         dataen = NFCADDR_CMD_DATAEN;
1921                 break;
1922         default:
1923                 break;
1924         }
1925
1926         if (do_addr)
1927                 acycle = nfc_make_addr(mtd, command, column, page_addr,
1928                                 &addr1234, &cycle0);
1929
1930         nfc_addr_cmd = cmd1 | cmd2 | vcmd2 | acycle | csid | dataen | nfcwr;
1931         nfc_send_command(host, nfc_addr_cmd, addr1234, cycle0);
1932
1933         /*
1934          * Program and erase have their own busy handlers status, sequential
1935          * in, and deplete1 need no delay.
1936          */
1937         switch (command) {
1938         case NAND_CMD_CACHEDPROG:
1939         case NAND_CMD_PAGEPROG:
1940         case NAND_CMD_ERASE1:
1941         case NAND_CMD_ERASE2:
1942         case NAND_CMD_RNDIN:
1943         case NAND_CMD_STATUS:
1944         case NAND_CMD_RNDOUT:
1945         case NAND_CMD_SEQIN:
1946         case NAND_CMD_READID:
1947                 return;
1948
1949         case NAND_CMD_READ0:
1950                 if (dataen == NFCADDR_CMD_DATAEN) {
1951                         host->nfc->data_in_sram = host->nfc->sram_bank0 +
1952                                 nfc_get_sram_off(host);
1953                         return;
1954                 }
1955                 /* fall through */
1956         default:
1957                 nfc_prepare_interrupt(host, NFC_SR_RB_EDGE);
1958                 nfc_wait_interrupt(host, NFC_SR_RB_EDGE);
1959         }
1960 }
1961
1962 static int nfc_sram_write_page(struct mtd_info *mtd, struct nand_chip *chip,
1963                         uint32_t offset, int data_len, const uint8_t *buf,
1964                         int oob_required, int page, int cached, int raw)
1965 {
1966         int cfg, len;
1967         int status = 0;
1968         struct atmel_nand_host *host = nand_get_controller_data(chip);
1969         void *sram = host->nfc->sram_bank0 + nfc_get_sram_off(host);
1970
1971         /* Subpage write is not supported */
1972         if (offset || (data_len < mtd->writesize))
1973                 return -EINVAL;
1974
1975         len = mtd->writesize;
1976         /* Copy page data to sram that will write to nand via NFC */
1977         if (use_dma) {
1978                 if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) != 0)
1979                         /* Fall back to use cpu copy */
1980                         memcpy(sram, buf, len);
1981         } else {
1982                 memcpy(sram, buf, len);
1983         }
1984
1985         cfg = nfc_readl(host->nfc->hsmc_regs, CFG);
1986         if (unlikely(raw) && oob_required) {
1987                 memcpy(sram + len, chip->oob_poi, mtd->oobsize);
1988                 len += mtd->oobsize;
1989                 nfc_writel(host->nfc->hsmc_regs, CFG, cfg | NFC_CFG_WSPARE);
1990         } else {
1991                 nfc_writel(host->nfc->hsmc_regs, CFG, cfg & ~NFC_CFG_WSPARE);
1992         }
1993
1994         if (chip->ecc.mode == NAND_ECC_HW && host->has_pmecc)
1995                 /*
1996                  * When use NFC sram, need set up PMECC before send
1997                  * NAND_CMD_SEQIN command. Since when the nand command
1998                  * is sent, nfc will do transfer from sram and nand.
1999                  */
2000                 pmecc_enable(host, NAND_ECC_WRITE);
2001
2002         host->nfc->will_write_sram = true;
2003         chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
2004         host->nfc->will_write_sram = false;
2005
2006         if (likely(!raw))
2007                 /* Need to write ecc into oob */
2008                 status = chip->ecc.write_page(mtd, chip, buf, oob_required,
2009                                               page);
2010
2011         if (status < 0)
2012                 return status;
2013
2014         chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
2015         status = chip->waitfunc(mtd, chip);
2016
2017         if ((status & NAND_STATUS_FAIL) && (chip->errstat))
2018                 status = chip->errstat(mtd, chip, FL_WRITING, status, page);
2019
2020         if (status & NAND_STATUS_FAIL)
2021                 return -EIO;
2022
2023         return 0;
2024 }
2025
2026 static int nfc_sram_init(struct mtd_info *mtd)
2027 {
2028         struct nand_chip *chip = mtd_to_nand(mtd);
2029         struct atmel_nand_host *host = nand_get_controller_data(chip);
2030         int res = 0;
2031
2032         /* Initialize the NFC CFG register */
2033         unsigned int cfg_nfc = 0;
2034
2035         /* set page size and oob layout */
2036         switch (mtd->writesize) {
2037         case 512:
2038                 cfg_nfc = NFC_CFG_PAGESIZE_512;
2039                 break;
2040         case 1024:
2041                 cfg_nfc = NFC_CFG_PAGESIZE_1024;
2042                 break;
2043         case 2048:
2044                 cfg_nfc = NFC_CFG_PAGESIZE_2048;
2045                 break;
2046         case 4096:
2047                 cfg_nfc = NFC_CFG_PAGESIZE_4096;
2048                 break;
2049         case 8192:
2050                 cfg_nfc = NFC_CFG_PAGESIZE_8192;
2051                 break;
2052         default:
2053                 dev_err(host->dev, "Unsupported page size for NFC.\n");
2054                 res = -ENXIO;
2055                 return res;
2056         }
2057
2058         /* oob bytes size = (NFCSPARESIZE + 1) * 4
2059          * Max support spare size is 512 bytes. */
2060         cfg_nfc |= (((mtd->oobsize / 4) - 1) << NFC_CFG_NFC_SPARESIZE_BIT_POS
2061                 & NFC_CFG_NFC_SPARESIZE);
2062         /* default set a max timeout */
2063         cfg_nfc |= NFC_CFG_RSPARE |
2064                         NFC_CFG_NFC_DTOCYC | NFC_CFG_NFC_DTOMUL;
2065
2066         nfc_writel(host->nfc->hsmc_regs, CFG, cfg_nfc);
2067
2068         host->nfc->will_write_sram = false;
2069         nfc_set_sram_bank(host, 0);
2070
2071         /* Use Write page with NFC SRAM only for PMECC or ECC NONE. */
2072         if (host->nfc->write_by_sram) {
2073                 if ((chip->ecc.mode == NAND_ECC_HW && host->has_pmecc) ||
2074                                 chip->ecc.mode == NAND_ECC_NONE)
2075                         chip->write_page = nfc_sram_write_page;
2076                 else
2077                         host->nfc->write_by_sram = false;
2078         }
2079
2080         dev_info(host->dev, "Using NFC Sram read %s\n",
2081                         host->nfc->write_by_sram ? "and write" : "");
2082         return 0;
2083 }
2084
2085 static struct platform_driver atmel_nand_nfc_driver;
2086 /*
2087  * Probe for the NAND device.
2088  */
2089 static int atmel_nand_probe(struct platform_device *pdev)
2090 {
2091         struct atmel_nand_host *host;
2092         struct mtd_info *mtd;
2093         struct nand_chip *nand_chip;
2094         struct resource *mem;
2095         int res, irq;
2096
2097         /* Allocate memory for the device structure (and zero it) */
2098         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2099         if (!host)
2100                 return -ENOMEM;
2101
2102         res = platform_driver_register(&atmel_nand_nfc_driver);
2103         if (res)
2104                 dev_err(&pdev->dev, "atmel_nand: can't register NFC driver\n");
2105
2106         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2107         host->io_base = devm_ioremap_resource(&pdev->dev, mem);
2108         if (IS_ERR(host->io_base)) {
2109                 res = PTR_ERR(host->io_base);
2110                 goto err_nand_ioremap;
2111         }
2112         host->io_phys = (dma_addr_t)mem->start;
2113
2114         nand_chip = &host->nand_chip;
2115         mtd = nand_to_mtd(nand_chip);
2116         host->dev = &pdev->dev;
2117         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
2118                 nand_set_flash_node(nand_chip, pdev->dev.of_node);
2119                 /* Only when CONFIG_OF is enabled of_node can be parsed */
2120                 res = atmel_of_init_port(host, pdev->dev.of_node);
2121                 if (res)
2122                         goto err_nand_ioremap;
2123         } else {
2124                 memcpy(&host->board, dev_get_platdata(&pdev->dev),
2125                        sizeof(struct atmel_nand_data));
2126         }
2127
2128          /* link the private data structures */
2129         nand_set_controller_data(nand_chip, host);
2130         mtd->dev.parent = &pdev->dev;
2131
2132         /* Set address of NAND IO lines */
2133         nand_chip->IO_ADDR_R = host->io_base;
2134         nand_chip->IO_ADDR_W = host->io_base;
2135
2136         if (nand_nfc.is_initialized) {
2137                 /* NFC driver is probed and initialized */
2138                 host->nfc = &nand_nfc;
2139
2140                 nand_chip->select_chip = nfc_select_chip;
2141                 nand_chip->dev_ready = nfc_device_ready;
2142                 nand_chip->cmdfunc = nfc_nand_command;
2143
2144                 /* Initialize the interrupt for NFC */
2145                 irq = platform_get_irq(pdev, 0);
2146                 if (irq < 0) {
2147                         dev_err(host->dev, "Cannot get HSMC irq!\n");
2148                         res = irq;
2149                         goto err_nand_ioremap;
2150                 }
2151
2152                 res = devm_request_irq(&pdev->dev, irq, hsmc_interrupt,
2153                                 0, "hsmc", host);
2154                 if (res) {
2155                         dev_err(&pdev->dev, "Unable to request HSMC irq %d\n",
2156                                 irq);
2157                         goto err_nand_ioremap;
2158                 }
2159         } else {
2160                 res = atmel_nand_set_enable_ready_pins(mtd);
2161                 if (res)
2162                         goto err_nand_ioremap;
2163
2164                 nand_chip->cmd_ctrl = atmel_nand_cmd_ctrl;
2165         }
2166
2167         nand_chip->ecc.mode = host->board.ecc_mode;
2168         nand_chip->chip_delay = 40;             /* 40us command delay time */
2169
2170         if (host->board.bus_width_16)   /* 16-bit bus width */
2171                 nand_chip->options |= NAND_BUSWIDTH_16;
2172
2173         nand_chip->read_buf = atmel_read_buf;
2174         nand_chip->write_buf = atmel_write_buf;
2175
2176         platform_set_drvdata(pdev, host);
2177         atmel_nand_enable(host);
2178
2179         if (gpio_is_valid(host->board.det_pin)) {
2180                 res = devm_gpio_request(&pdev->dev,
2181                                 host->board.det_pin, "nand_det");
2182                 if (res < 0) {
2183                         dev_err(&pdev->dev,
2184                                 "can't request det gpio %d\n",
2185                                 host->board.det_pin);
2186                         goto err_no_card;
2187                 }
2188
2189                 res = gpio_direction_input(host->board.det_pin);
2190                 if (res < 0) {
2191                         dev_err(&pdev->dev,
2192                                 "can't request input direction det gpio %d\n",
2193                                 host->board.det_pin);
2194                         goto err_no_card;
2195                 }
2196
2197                 if (gpio_get_value(host->board.det_pin)) {
2198                         dev_info(&pdev->dev, "No SmartMedia card inserted.\n");
2199                         res = -ENXIO;
2200                         goto err_no_card;
2201                 }
2202         }
2203
2204         if (host->board.on_flash_bbt || on_flash_bbt) {
2205                 dev_info(&pdev->dev, "Use On Flash BBT\n");
2206                 nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
2207         }
2208
2209         if (!host->board.has_dma)
2210                 use_dma = 0;
2211
2212         if (use_dma) {
2213                 dma_cap_mask_t mask;
2214
2215                 dma_cap_zero(mask);
2216                 dma_cap_set(DMA_MEMCPY, mask);
2217                 host->dma_chan = dma_request_channel(mask, NULL, NULL);
2218                 if (!host->dma_chan) {
2219                         dev_err(host->dev, "Failed to request DMA channel\n");
2220                         use_dma = 0;
2221                 }
2222         }
2223         if (use_dma)
2224                 dev_info(host->dev, "Using %s for DMA transfers.\n",
2225                                         dma_chan_name(host->dma_chan));
2226         else
2227                 dev_info(host->dev, "No DMA support for NAND access.\n");
2228
2229         /* first scan to find the device and get the page size */
2230         if (nand_scan_ident(mtd, 1, NULL)) {
2231                 res = -ENXIO;
2232                 goto err_scan_ident;
2233         }
2234
2235         if (nand_chip->ecc.mode == NAND_ECC_HW) {
2236                 if (host->has_pmecc)
2237                         res = atmel_pmecc_nand_init_params(pdev, host);
2238                 else
2239                         res = atmel_hw_nand_init_params(pdev, host);
2240
2241                 if (res != 0)
2242                         goto err_hw_ecc;
2243         }
2244
2245         /* initialize the nfc configuration register */
2246         if (host->nfc && host->nfc->use_nfc_sram) {
2247                 res = nfc_sram_init(mtd);
2248                 if (res) {
2249                         host->nfc->use_nfc_sram = false;
2250                         dev_err(host->dev, "Disable use nfc sram for data transfer.\n");
2251                 }
2252         }
2253
2254         /* second phase scan */
2255         if (nand_scan_tail(mtd)) {
2256                 res = -ENXIO;
2257                 goto err_scan_tail;
2258         }
2259
2260         mtd->name = "atmel_nand";
2261         res = mtd_device_register(mtd, host->board.parts,
2262                                   host->board.num_parts);
2263         if (!res)
2264                 return res;
2265
2266 err_scan_tail:
2267         if (host->has_pmecc && host->nand_chip.ecc.mode == NAND_ECC_HW)
2268                 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
2269 err_hw_ecc:
2270 err_scan_ident:
2271 err_no_card:
2272         atmel_nand_disable(host);
2273         if (host->dma_chan)
2274                 dma_release_channel(host->dma_chan);
2275 err_nand_ioremap:
2276         return res;
2277 }
2278
2279 /*
2280  * Remove a NAND device.
2281  */
2282 static int atmel_nand_remove(struct platform_device *pdev)
2283 {
2284         struct atmel_nand_host *host = platform_get_drvdata(pdev);
2285         struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
2286
2287         nand_release(mtd);
2288
2289         atmel_nand_disable(host);
2290
2291         if (host->has_pmecc && host->nand_chip.ecc.mode == NAND_ECC_HW) {
2292                 pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
2293                 pmerrloc_writel(host->pmerrloc_base, ELDIS,
2294                                 PMERRLOC_DISABLE);
2295         }
2296
2297         if (host->dma_chan)
2298                 dma_release_channel(host->dma_chan);
2299
2300         platform_driver_unregister(&atmel_nand_nfc_driver);
2301
2302         return 0;
2303 }
2304
2305 static const struct atmel_nand_caps at91rm9200_caps = {
2306         .pmecc_correct_erase_page = false,
2307 };
2308
2309 static const struct atmel_nand_caps sama5d4_caps = {
2310         .pmecc_correct_erase_page = true,
2311 };
2312
2313 static const struct of_device_id atmel_nand_dt_ids[] = {
2314         { .compatible = "atmel,at91rm9200-nand", .data = &at91rm9200_caps },
2315         { .compatible = "atmel,sama5d4-nand", .data = &sama5d4_caps },
2316         { /* sentinel */ }
2317 };
2318
2319 MODULE_DEVICE_TABLE(of, atmel_nand_dt_ids);
2320
2321 static int atmel_nand_nfc_probe(struct platform_device *pdev)
2322 {
2323         struct atmel_nfc *nfc = &nand_nfc;
2324         struct resource *nfc_cmd_regs, *nfc_hsmc_regs, *nfc_sram;
2325         int ret;
2326
2327         nfc_cmd_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2328         nfc->base_cmd_regs = devm_ioremap_resource(&pdev->dev, nfc_cmd_regs);
2329         if (IS_ERR(nfc->base_cmd_regs))
2330                 return PTR_ERR(nfc->base_cmd_regs);
2331
2332         nfc_hsmc_regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2333         nfc->hsmc_regs = devm_ioremap_resource(&pdev->dev, nfc_hsmc_regs);
2334         if (IS_ERR(nfc->hsmc_regs))
2335                 return PTR_ERR(nfc->hsmc_regs);
2336
2337         nfc_sram = platform_get_resource(pdev, IORESOURCE_MEM, 2);
2338         if (nfc_sram) {
2339                 nfc->sram_bank0 = (void * __force)
2340                                 devm_ioremap_resource(&pdev->dev, nfc_sram);
2341                 if (IS_ERR(nfc->sram_bank0)) {
2342                         dev_warn(&pdev->dev, "Fail to ioremap the NFC sram with error: %ld. So disable NFC sram.\n",
2343                                         PTR_ERR(nfc->sram_bank0));
2344                 } else {
2345                         nfc->use_nfc_sram = true;
2346                         nfc->sram_bank0_phys = (dma_addr_t)nfc_sram->start;
2347
2348                         if (pdev->dev.of_node)
2349                                 nfc->write_by_sram = of_property_read_bool(
2350                                                 pdev->dev.of_node,
2351                                                 "atmel,write-by-sram");
2352                 }
2353         }
2354
2355         nfc_writel(nfc->hsmc_regs, IDR, 0xffffffff);
2356         nfc_readl(nfc->hsmc_regs, SR);  /* clear the NFC_SR */
2357
2358         nfc->clk = devm_clk_get(&pdev->dev, NULL);
2359         if (!IS_ERR(nfc->clk)) {
2360                 ret = clk_prepare_enable(nfc->clk);
2361                 if (ret)
2362                         return ret;
2363         } else {
2364                 dev_warn(&pdev->dev, "NFC clock missing, update your Device Tree");
2365         }
2366
2367         nfc->is_initialized = true;
2368         dev_info(&pdev->dev, "NFC is probed.\n");
2369
2370         return 0;
2371 }
2372
2373 static int atmel_nand_nfc_remove(struct platform_device *pdev)
2374 {
2375         struct atmel_nfc *nfc = &nand_nfc;
2376
2377         if (!IS_ERR(nfc->clk))
2378                 clk_disable_unprepare(nfc->clk);
2379
2380         return 0;
2381 }
2382
2383 static const struct of_device_id atmel_nand_nfc_match[] = {
2384         { .compatible = "atmel,sama5d3-nfc" },
2385         { /* sentinel */ }
2386 };
2387 MODULE_DEVICE_TABLE(of, atmel_nand_nfc_match);
2388
2389 static struct platform_driver atmel_nand_nfc_driver = {
2390         .driver = {
2391                 .name = "atmel_nand_nfc",
2392                 .of_match_table = of_match_ptr(atmel_nand_nfc_match),
2393         },
2394         .probe = atmel_nand_nfc_probe,
2395         .remove = atmel_nand_nfc_remove,
2396 };
2397
2398 static struct platform_driver atmel_nand_driver = {
2399         .probe          = atmel_nand_probe,
2400         .remove         = atmel_nand_remove,
2401         .driver         = {
2402                 .name   = "atmel_nand",
2403                 .of_match_table = of_match_ptr(atmel_nand_dt_ids),
2404         },
2405 };
2406
2407 module_platform_driver(atmel_nand_driver);
2408
2409 MODULE_LICENSE("GPL");
2410 MODULE_AUTHOR("Rick Bronson");
2411 MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91 / AVR32");
2412 MODULE_ALIAS("platform:atmel_nand");