drivers/mtd/nand/lpc32xx_mlc.c

   1 /*
   2  * Driver for NAND MLC Controller in LPC32xx
   3  *
   4  * Author: Roland Stigge <stigge@antcom.de>
   5  *
   6  * Copyright © 2011 WORK Microwave GmbH
   7  * Copyright © 2011, 2012 Roland Stigge
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  *
  20  * NAND Flash Controller Operation:
  21  * - Read: Auto Decode
  22  * - Write: Auto Encode
  23  * - Tested Page Sizes: 2048, 4096
  24  */
  25
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/nand.h>
  31 #include <linux/mtd/partitions.h>
  32 #include <linux/clk.h>
  33 #include <linux/err.h>
  34 #include <linux/delay.h>
  35 #include <linux/completion.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/of.h>
  38 #include <linux/of_gpio.h>
  39 #include <linux/mtd/lpc32xx_mlc.h>
  40 #include <linux/io.h>
  41 #include <linux/mm.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/dmaengine.h>
  44 #include <linux/mtd/nand_ecc.h>
  45
  46 #define DRV_NAME "lpc32xx_mlc"
  47
  48 /**********************************************************************
  49 * MLC NAND controller register offsets
  50 **********************************************************************/
  51
  52 #define MLC_BUFF(x)                     (x + 0x00000)
  53 #define MLC_DATA(x)                     (x + 0x08000)
  54 #define MLC_CMD(x)                      (x + 0x10000)
  55 #define MLC_ADDR(x)                     (x + 0x10004)
  56 #define MLC_ECC_ENC_REG(x)              (x + 0x10008)
  57 #define MLC_ECC_DEC_REG(x)              (x + 0x1000C)
  58 #define MLC_ECC_AUTO_ENC_REG(x)         (x + 0x10010)
  59 #define MLC_ECC_AUTO_DEC_REG(x)         (x + 0x10014)
  60 #define MLC_RPR(x)                      (x + 0x10018)
  61 #define MLC_WPR(x)                      (x + 0x1001C)
  62 #define MLC_RUBP(x)                     (x + 0x10020)
  63 #define MLC_ROBP(x)                     (x + 0x10024)
  64 #define MLC_SW_WP_ADD_LOW(x)            (x + 0x10028)
  65 #define MLC_SW_WP_ADD_HIG(x)            (x + 0x1002C)
  66 #define MLC_ICR(x)                      (x + 0x10030)
  67 #define MLC_TIME_REG(x)                 (x + 0x10034)
  68 #define MLC_IRQ_MR(x)                   (x + 0x10038)
  69 #define MLC_IRQ_SR(x)                   (x + 0x1003C)
  70 #define MLC_LOCK_PR(x)                  (x + 0x10044)
  71 #define MLC_ISR(x)                      (x + 0x10048)
  72 #define MLC_CEH(x)                      (x + 0x1004C)
  73
  74 /**********************************************************************
  75 * MLC_CMD bit definitions
  76 **********************************************************************/
  77 #define MLCCMD_RESET                    0xFF
  78
  79 /**********************************************************************
  80 * MLC_ICR bit definitions
  81 **********************************************************************/
  82 #define MLCICR_WPROT                    (1 << 3)
  83 #define MLCICR_LARGEBLOCK               (1 << 2)
  84 #define MLCICR_LONGADDR                 (1 << 1)
  85 #define MLCICR_16BIT                    (1 << 0)  /* unsupported by LPC32x0! */
  86
  87 /**********************************************************************
  88 * MLC_TIME_REG bit definitions
  89 **********************************************************************/
  90 #define MLCTIMEREG_TCEA_DELAY(n)        (((n) & 0x03) << 24)
  91 #define MLCTIMEREG_BUSY_DELAY(n)        (((n) & 0x1F) << 19)
  92 #define MLCTIMEREG_NAND_TA(n)           (((n) & 0x07) << 16)
  93 #define MLCTIMEREG_RD_HIGH(n)           (((n) & 0x0F) << 12)
  94 #define MLCTIMEREG_RD_LOW(n)            (((n) & 0x0F) << 8)
  95 #define MLCTIMEREG_WR_HIGH(n)           (((n) & 0x0F) << 4)
  96 #define MLCTIMEREG_WR_LOW(n)            (((n) & 0x0F) << 0)
  97
  98 /**********************************************************************
  99 * MLC_IRQ_MR and MLC_IRQ_SR bit definitions
 100 **********************************************************************/
 101 #define MLCIRQ_NAND_READY               (1 << 5)
 102 #define MLCIRQ_CONTROLLER_READY         (1 << 4)
 103 #define MLCIRQ_DECODE_FAILURE           (1 << 3)
 104 #define MLCIRQ_DECODE_ERROR             (1 << 2)
 105 #define MLCIRQ_ECC_READY                (1 << 1)
 106 #define MLCIRQ_WRPROT_FAULT             (1 << 0)
 107
 108 /**********************************************************************
 109 * MLC_LOCK_PR bit definitions
 110 **********************************************************************/
 111 #define MLCLOCKPR_MAGIC                 0xA25E
 112
 113 /**********************************************************************
 114 * MLC_ISR bit definitions
 115 **********************************************************************/
 116 #define MLCISR_DECODER_FAILURE          (1 << 6)
 117 #define MLCISR_ERRORS                   ((1 << 4) | (1 << 5))
 118 #define MLCISR_ERRORS_DETECTED          (1 << 3)
 119 #define MLCISR_ECC_READY                (1 << 2)
 120 #define MLCISR_CONTROLLER_READY         (1 << 1)
 121 #define MLCISR_NAND_READY               (1 << 0)
 122
 123 /**********************************************************************
 124 * MLC_CEH bit definitions
 125 **********************************************************************/
 126 #define MLCCEH_NORMAL                   (1 << 0)
 127
 128 struct lpc32xx_nand_cfg_mlc {
 129         uint32_t tcea_delay;
 130         uint32_t busy_delay;
 131         uint32_t nand_ta;
 132         uint32_t rd_high;
 133         uint32_t rd_low;
 134         uint32_t wr_high;
 135         uint32_t wr_low;
 136         int wp_gpio;
 137         struct mtd_partition *parts;
 138         unsigned num_parts;
 139 };
 140
 141 static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
 142                                  struct mtd_oob_region *oobregion)
 143 {
 144         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 145
 146         if (section >= nand_chip->ecc.steps)
 147                 return -ERANGE;
 148
 149         oobregion->offset = ((section + 1) * 16) - nand_chip->ecc.bytes;
 150         oobregion->length = nand_chip->ecc.bytes;
 151
 152         return 0;
 153 }
 154
 155 static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
 156                                   struct mtd_oob_region *oobregion)
 157 {
 158         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 159
 160         if (section >= nand_chip->ecc.steps)
 161                 return -ERANGE;
 162
 163         oobregion->offset = 16 * section;
 164         oobregion->length = 16 - nand_chip->ecc.bytes;
 165
 166         return 0;
 167 }
 168
 169 static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
 170         .ecc = lpc32xx_ooblayout_ecc,
 171         .free = lpc32xx_ooblayout_free,
 172 };
 173
 174 static struct nand_bbt_descr lpc32xx_nand_bbt = {
 175         .options = NAND_BBT_ABSPAGE | NAND_BBT_2BIT | NAND_BBT_NO_OOB |
 176                    NAND_BBT_WRITE,
 177         .pages = { 524224, 0, 0, 0, 0, 0, 0, 0 },
 178 };
 179
 180 static struct nand_bbt_descr lpc32xx_nand_bbt_mirror = {
 181         .options = NAND_BBT_ABSPAGE | NAND_BBT_2BIT | NAND_BBT_NO_OOB |
 182                    NAND_BBT_WRITE,
 183         .pages = { 524160, 0, 0, 0, 0, 0, 0, 0 },
 184 };
 185
 186 struct lpc32xx_nand_host {
 187         struct nand_chip        nand_chip;
 188         struct lpc32xx_mlc_platform_data *pdata;
 189         struct clk              *clk;
 190         void __iomem            *io_base;
 191         int                     irq;
 192         struct lpc32xx_nand_cfg_mlc     *ncfg;
 193         struct completion       comp_nand;
 194         struct completion       comp_controller;
 195         uint32_t llptr;
 196         /*
 197          * Physical addresses of ECC buffer, DMA data buffers, OOB data buffer
 198          */
 199         dma_addr_t              oob_buf_phy;
 200         /*
 201          * Virtual addresses of ECC buffer, DMA data buffers, OOB data buffer
 202          */
 203         uint8_t                 *oob_buf;
 204         /* Physical address of DMA base address */
 205         dma_addr_t              io_base_phy;
 206
 207         struct completion       comp_dma;
 208         struct dma_chan         *dma_chan;
 209         struct dma_slave_config dma_slave_config;
 210         struct scatterlist      sgl;
 211         uint8_t                 *dma_buf;
 212         uint8_t                 *dummy_buf;
 213         int                     mlcsubpages; /* number of 512bytes-subpages */
 214 };
 215
 216 /*
 217  * Activate/Deactivate DMA Operation:
 218  *
 219  * Using the PL080 DMA Controller for transferring the 512 byte subpages
 220  * instead of doing readl() / writel() in a loop slows it down significantly.
 221  * Measurements via getnstimeofday() upon 512 byte subpage reads reveal:
 222  *
 223  * - readl() of 128 x 32 bits in a loop: ~20us
 224  * - DMA read of 512 bytes (32 bit, 4...128 words bursts): ~60us
 225  * - DMA read of 512 bytes (32 bit, no bursts): ~100us
 226  *
 227  * This applies to the transfer itself. In the DMA case: only the
 228  * wait_for_completion() (DMA setup _not_ included).
 229  *
 230  * Note that the 512 bytes subpage transfer is done directly from/to a
 231  * FIFO/buffer inside the NAND controller. Most of the time (~400-800us for a
 232  * 2048 bytes page) is spent waiting for the NAND IRQ, anyway. (The NAND
 233  * controller transferring data between its internal buffer to/from the NAND
 234  * chip.)
 235  *
 236  * Therefore, using the PL080 DMA is disabled by default, for now.
 237  *
 238  */
 239 static int use_dma;
 240
 241 static void lpc32xx_nand_setup(struct lpc32xx_nand_host *host)
 242 {
 243         uint32_t clkrate, tmp;
 244
 245         /* Reset MLC controller */
 246         writel(MLCCMD_RESET, MLC_CMD(host->io_base));
 247         udelay(1000);
 248
 249         /* Get base clock for MLC block */
 250         clkrate = clk_get_rate(host->clk);
 251         if (clkrate == 0)
 252                 clkrate = 104000000;
 253
 254         /* Unlock MLC_ICR
 255          * (among others, will be locked again automatically) */
 256         writew(MLCLOCKPR_MAGIC, MLC_LOCK_PR(host->io_base));
 257
 258         /* Configure MLC Controller: Large Block, 5 Byte Address */
 259         tmp = MLCICR_LARGEBLOCK | MLCICR_LONGADDR;
 260         writel(tmp, MLC_ICR(host->io_base));
 261
 262         /* Unlock MLC_TIME_REG
 263          * (among others, will be locked again automatically) */
 264         writew(MLCLOCKPR_MAGIC, MLC_LOCK_PR(host->io_base));
 265
 266         /* Compute clock setup values, see LPC and NAND manual */
 267         tmp = 0;
 268         tmp |= MLCTIMEREG_TCEA_DELAY(clkrate / host->ncfg->tcea_delay + 1);
 269         tmp |= MLCTIMEREG_BUSY_DELAY(clkrate / host->ncfg->busy_delay + 1);
 270         tmp |= MLCTIMEREG_NAND_TA(clkrate / host->ncfg->nand_ta + 1);
 271         tmp |= MLCTIMEREG_RD_HIGH(clkrate / host->ncfg->rd_high + 1);
 272         tmp |= MLCTIMEREG_RD_LOW(clkrate / host->ncfg->rd_low);
 273         tmp |= MLCTIMEREG_WR_HIGH(clkrate / host->ncfg->wr_high + 1);
 274         tmp |= MLCTIMEREG_WR_LOW(clkrate / host->ncfg->wr_low);
 275         writel(tmp, MLC_TIME_REG(host->io_base));
 276
 277         /* Enable IRQ for CONTROLLER_READY and NAND_READY */
 278         writeb(MLCIRQ_CONTROLLER_READY | MLCIRQ_NAND_READY,
 279                         MLC_IRQ_MR(host->io_base));
 280
 281         /* Normal nCE operation: nCE controlled by controller */
 282         writel(MLCCEH_NORMAL, MLC_CEH(host->io_base));
 283 }
 284
 285 /*
 286  * Hardware specific access to control lines
 287  */
 288 static void lpc32xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
 289                                   unsigned int ctrl)
 290 {
 291         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 292         struct lpc32xx_nand_host *host = nand_get_controller_data(nand_chip);
 293
 294         if (cmd != NAND_CMD_NONE) {
 295                 if (ctrl & NAND_CLE)
 296                         writel(cmd, MLC_CMD(host->io_base));
 297                 else
 298                         writel(cmd, MLC_ADDR(host->io_base));
 299         }
 300 }
 301
 302 /*
 303  * Read Device Ready (NAND device _and_ controller ready)
 304  */
 305 static int lpc32xx_nand_device_ready(struct mtd_info *mtd)
 306 {
 307         struct nand_chip *nand_chip = mtd_to_nand(mtd);
 308         struct lpc32xx_nand_host *host = nand_get_controller_data(nand_chip);
 309
 310         if ((readb(MLC_ISR(host->io_base)) &
 311              (MLCISR_CONTROLLER_READY | MLCISR_NAND_READY)) ==
 312             (MLCISR_CONTROLLER_READY | MLCISR_NAND_READY))
 313                 return  1;
 314
 315         return 0;
 316 }
 317
 318 static irqreturn_t lpc3xxx_nand_irq(int irq, struct lpc32xx_nand_host *host)
 319 {
 320         uint8_t sr;
 321
 322         /* Clear interrupt flag by reading status */
 323         sr = readb(MLC_IRQ_SR(host->io_base));
 324         if (sr & MLCIRQ_NAND_READY)
 325                 complete(&host->comp_nand);
 326         if (sr & MLCIRQ_CONTROLLER_READY)
 327                 complete(&host->comp_controller);
 328
 329         return IRQ_HANDLED;
 330 }
 331
 332 static int lpc32xx_waitfunc_nand(struct mtd_info *mtd, struct nand_chip *chip)
 333 {
 334         struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
 335
 336         if (readb(MLC_ISR(host->io_base)) & MLCISR_NAND_READY)
 337                 goto exit;
 338
 339         wait_for_completion(&host->comp_nand);
 340
 341         while (!(readb(MLC_ISR(host->io_base)) & MLCISR_NAND_READY)) {
 342                 /* Seems to be delayed sometimes by controller */
 343                 dev_dbg(&mtd->dev, "Warning: NAND not ready.\n");
 344                 cpu_relax();
 345         }
 346
 347 exit:
 348         return NAND_STATUS_READY;
 349 }
 350
 351 static int lpc32xx_waitfunc_controller(struct mtd_info *mtd,
 352                                        struct nand_chip *chip)
 353 {
 354         struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
 355
 356         if (readb(MLC_ISR(host->io_base)) & MLCISR_CONTROLLER_READY)
 357                 goto exit;
 358
 359         wait_for_completion(&host->comp_controller);
 360
 361         while (!(readb(MLC_ISR(host->io_base)) &
 362                  MLCISR_CONTROLLER_READY)) {
 363                 dev_dbg(&mtd->dev, "Warning: Controller not ready.\n");
 364                 cpu_relax();
 365         }
 366
 367 exit:
 368         return NAND_STATUS_READY;
 369 }
 370
 371 static int lpc32xx_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
 372 {
 373         lpc32xx_waitfunc_nand(mtd, chip);
 374         lpc32xx_waitfunc_controller(mtd, chip);
 375
 376         return NAND_STATUS_READY;
 377 }
 378
 379 /*
 380  * Enable NAND write protect
 381  */
 382 static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
 383 {
 384         if (gpio_is_valid(host->ncfg->wp_gpio))
 385                 gpio_set_value(host->ncfg->wp_gpio, 0);
 386 }
 387
 388 /*
 389  * Disable NAND write protect
 390  */
 391 static void lpc32xx_wp_disable(struct lpc32xx_nand_host *host)
 392 {
 393         if (gpio_is_valid(host->ncfg->wp_gpio))
 394                 gpio_set_value(host->ncfg->wp_gpio, 1);
 395 }
 396
 397 static void lpc32xx_dma_complete_func(void *completion)
 398 {
 399         complete(completion);
 400 }
 401
 402 static int lpc32xx_xmit_dma(struct mtd_info *mtd, void *mem, int len,
 403                             enum dma_transfer_direction dir)
 404 {
 405         struct nand_chip *chip = mtd_to_nand(mtd);
 406         struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
 407         struct dma_async_tx_descriptor *desc;
 408         int flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 409         int res;
 410
 411         sg_init_one(&host->sgl, mem, len);
 412
 413         res = dma_map_sg(host->dma_chan->device->dev, &host->sgl, 1,
 414                          DMA_BIDIRECTIONAL);
 415         if (res != 1) {
 416                 dev_err(mtd->dev.parent, "Failed to map sg list\n");
 417                 return -ENXIO;
 418         }
 419         desc = dmaengine_prep_slave_sg(host->dma_chan, &host->sgl, 1, dir,
 420                                        flags);
 421         if (!desc) {
 422                 dev_err(mtd->dev.parent, "Failed to prepare slave sg\n");
 423                 goto out1;
 424         }
 425
 426         init_completion(&host->comp_dma);
 427         desc->callback = lpc32xx_dma_complete_func;
 428         desc->callback_param = &host->comp_dma;
 429
 430         dmaengine_submit(desc);
 431         dma_async_issue_pending(host->dma_chan);
 432
 433         wait_for_completion_timeout(&host->comp_dma, msecs_to_jiffies(1000));
 434
 435         dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1,
 436                      DMA_BIDIRECTIONAL);
 437         return 0;
 438 out1:
 439         dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1,
 440                      DMA_BIDIRECTIONAL);
 441         return -ENXIO;
 442 }
 443
 444 static int lpc32xx_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 445                              uint8_t *buf, int oob_required, int page)
 446 {
 447         struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
 448         int i, j;
 449         uint8_t *oobbuf = chip->oob_poi;
 450         uint32_t mlc_isr;
 451         int res;
 452         uint8_t *dma_buf;
 453         bool dma_mapped;
 454
 455         if ((void *)buf <= high_memory) {
 456                 dma_buf = buf;
 457                 dma_mapped = true;
 458         } else {
 459                 dma_buf = host->dma_buf;
 460                 dma_mapped = false;
 461         }
 462
 463         /* Writing Command and Address */
 464         chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 465
 466         /* For all sub-pages */
 467         for (i = 0; i < host->mlcsubpages; i++) {
 468                 /* Start Auto Decode Command */
 469                 writeb(0x00, MLC_ECC_AUTO_DEC_REG(host->io_base));
 470
 471                 /* Wait for Controller Ready */
 472                 lpc32xx_waitfunc_controller(mtd, chip);
 473
 474                 /* Check ECC Error status */
 475                 mlc_isr = readl(MLC_ISR(host->io_base));
 476                 if (mlc_isr & MLCISR_DECODER_FAILURE) {
 477                         mtd->ecc_stats.failed++;
 478                         dev_warn(&mtd->dev, "%s: DECODER_FAILURE\n", __func__);
 479                 } else if (mlc_isr & MLCISR_ERRORS_DETECTED) {
 480                         mtd->ecc_stats.corrected += ((mlc_isr >> 4) & 0x3) + 1;
 481                 }
 482
 483                 /* Read 512 + 16 Bytes */
 484                 if (use_dma) {
 485                         res = lpc32xx_xmit_dma(mtd, dma_buf + i * 512, 512,
 486                                                DMA_DEV_TO_MEM);
 487                         if (res)
 488                                 return res;
 489                 } else {
 490                         for (j = 0; j < (512 >> 2); j++) {
 491                                 *((uint32_t *)(buf)) =
 492                                         readl(MLC_BUFF(host->io_base));
 493                                 buf += 4;
 494                         }
 495                 }
 496                 for (j = 0; j < (16 >> 2); j++) {
 497                         *((uint32_t *)(oobbuf)) =
 498                                 readl(MLC_BUFF(host->io_base));
 499                         oobbuf += 4;
 500                 }
 501         }
 502
 503         if (use_dma && !dma_mapped)
 504                 memcpy(buf, dma_buf, mtd->writesize);
 505
 506         return 0;
 507 }
 508
 509 static int lpc32xx_write_page_lowlevel(struct mtd_info *mtd,
 510                                        struct nand_chip *chip,
 511                                        const uint8_t *buf, int oob_required,
 512                                        int page)
 513 {
 514         struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
 515         const uint8_t *oobbuf = chip->oob_poi;
 516         uint8_t *dma_buf = (uint8_t *)buf;
 517         int res;
 518         int i, j;
 519
 520         if (use_dma && (void *)buf >= high_memory) {
 521                 dma_buf = host->dma_buf;
 522                 memcpy(dma_buf, buf, mtd->writesize);
 523         }
 524
 525         for (i = 0; i < host->mlcsubpages; i++) {
 526                 /* Start Encode */
 527                 writeb(0x00, MLC_ECC_ENC_REG(host->io_base));
 528
 529                 /* Write 512 + 6 Bytes to Buffer */
 530                 if (use_dma) {
 531                         res = lpc32xx_xmit_dma(mtd, dma_buf + i * 512, 512,
 532                                                DMA_MEM_TO_DEV);
 533                         if (res)
 534                                 return res;
 535                 } else {
 536                         for (j = 0; j < (512 >> 2); j++) {
 537                                 writel(*((uint32_t *)(buf)),
 538                                        MLC_BUFF(host->io_base));
 539                                 buf += 4;
 540                         }
 541                 }
 542                 writel(*((uint32_t *)(oobbuf)), MLC_BUFF(host->io_base));
 543                 oobbuf += 4;
 544                 writew(*((uint16_t *)(oobbuf)), MLC_BUFF(host->io_base));
 545                 oobbuf += 12;
 546
 547                 /* Auto Encode w/ Bit 8 = 0 (see LPC MLC Controller manual) */
 548                 writeb(0x00, MLC_ECC_AUTO_ENC_REG(host->io_base));
 549
 550                 /* Wait for Controller Ready */
 551                 lpc32xx_waitfunc_controller(mtd, chip);
 552         }
 553         return 0;
 554 }
 555
 556 static int lpc32xx_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 557                             int page)
 558 {
 559         struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
 560
 561         /* Read whole page - necessary with MLC controller! */
 562         lpc32xx_read_page(mtd, chip, host->dummy_buf, 1, page);
 563
 564         return 0;
 565 }
 566
 567 static int lpc32xx_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 568                               int page)
 569 {
 570         /* None, write_oob conflicts with the automatic LPC MLC ECC decoder! */
 571         return 0;
 572 }
 573
 574 /* Prepares MLC for transfers with H/W ECC enabled: always enabled anyway */
 575 static void lpc32xx_ecc_enable(struct mtd_info *mtd, int mode)
 576 {
 577         /* Always enabled! */
 578 }
 579
 580 static int lpc32xx_dma_setup(struct lpc32xx_nand_host *host)
 581 {
 582         struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
 583         dma_cap_mask_t mask;
 584
 585         if (!host->pdata || !host->pdata->dma_filter) {
 586                 dev_err(mtd->dev.parent, "no DMA platform data\n");
 587                 return -ENOENT;
 588         }
 589
 590         dma_cap_zero(mask);
 591         dma_cap_set(DMA_SLAVE, mask);
 592         host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
 593                                              "nand-mlc");
 594         if (!host->dma_chan) {
 595                 dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
 596                 return -EBUSY;
 597         }
 598
 599         /*
 600          * Set direction to a sensible value even if the dmaengine driver
 601          * should ignore it. With the default (DMA_MEM_TO_MEM), the amba-pl08x
 602          * driver criticizes it as "alien transfer direction".
 603          */
 604         host->dma_slave_config.direction = DMA_DEV_TO_MEM;
 605         host->dma_slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 606         host->dma_slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 607         host->dma_slave_config.src_maxburst = 128;
 608         host->dma_slave_config.dst_maxburst = 128;
 609         /* DMA controller does flow control: */
 610         host->dma_slave_config.device_fc = false;
 611         host->dma_slave_config.src_addr = MLC_BUFF(host->io_base_phy);
 612         host->dma_slave_config.dst_addr = MLC_BUFF(host->io_base_phy);
 613         if (dmaengine_slave_config(host->dma_chan, &host->dma_slave_config)) {
 614                 dev_err(mtd->dev.parent, "Failed to setup DMA slave\n");
 615                 goto out1;
 616         }
 617
 618         return 0;
 619 out1:
 620         dma_release_channel(host->dma_chan);
 621         return -ENXIO;
 622 }
 623
 624 static struct lpc32xx_nand_cfg_mlc *lpc32xx_parse_dt(struct device *dev)
 625 {
 626         struct lpc32xx_nand_cfg_mlc *ncfg;
 627         struct device_node *np = dev->of_node;
 628
 629         ncfg = devm_kzalloc(dev, sizeof(*ncfg), GFP_KERNEL);
 630         if (!ncfg)
 631                 return NULL;
 632
 633         of_property_read_u32(np, "nxp,tcea-delay", &ncfg->tcea_delay);
 634         of_property_read_u32(np, "nxp,busy-delay", &ncfg->busy_delay);
 635         of_property_read_u32(np, "nxp,nand-ta", &ncfg->nand_ta);
 636         of_property_read_u32(np, "nxp,rd-high", &ncfg->rd_high);
 637         of_property_read_u32(np, "nxp,rd-low", &ncfg->rd_low);
 638         of_property_read_u32(np, "nxp,wr-high", &ncfg->wr_high);
 639         of_property_read_u32(np, "nxp,wr-low", &ncfg->wr_low);
 640
 641         if (!ncfg->tcea_delay || !ncfg->busy_delay || !ncfg->nand_ta ||
 642             !ncfg->rd_high || !ncfg->rd_low || !ncfg->wr_high ||
 643             !ncfg->wr_low) {
 644                 dev_err(dev, "chip parameters not specified correctly\n");
 645                 return NULL;
 646         }
 647
 648         ncfg->wp_gpio = of_get_named_gpio(np, "gpios", 0);
 649
 650         return ncfg;
 651 }
 652
 653 /*
 654  * Probe for NAND controller
 655  */
 656 static int lpc32xx_nand_probe(struct platform_device *pdev)
 657 {
 658         struct lpc32xx_nand_host *host;
 659         struct mtd_info *mtd;
 660         struct nand_chip *nand_chip;
 661         struct resource *rc;
 662         int res;
 663
 664         /* Allocate memory for the device structure (and zero it) */
 665         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 666         if (!host)
 667                 return -ENOMEM;
 668
 669         rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 670         host->io_base = devm_ioremap_resource(&pdev->dev, rc);
 671         if (IS_ERR(host->io_base))
 672                 return PTR_ERR(host->io_base);
 673
 674         host->io_base_phy = rc->start;
 675
 676         nand_chip = &host->nand_chip;
 677         mtd = nand_to_mtd(nand_chip);
 678         if (pdev->dev.of_node)
 679                 host->ncfg = lpc32xx_parse_dt(&pdev->dev);
 680         if (!host->ncfg) {
 681                 dev_err(&pdev->dev,
 682                         "Missing or bad NAND config from device tree\n");
 683                 return -ENOENT;
 684         }
 685         if (host->ncfg->wp_gpio == -EPROBE_DEFER)
 686                 return -EPROBE_DEFER;
 687         if (gpio_is_valid(host->ncfg->wp_gpio) &&
 688                         gpio_request(host->ncfg->wp_gpio, "NAND WP")) {
 689                 dev_err(&pdev->dev, "GPIO not available\n");
 690                 return -EBUSY;
 691         }
 692         lpc32xx_wp_disable(host);
 693
 694         host->pdata = dev_get_platdata(&pdev->dev);
 695
 696         /* link the private data structures */
 697         nand_set_controller_data(nand_chip, host);
 698         nand_set_flash_node(nand_chip, pdev->dev.of_node);
 699         mtd->dev.parent = &pdev->dev;
 700
 701         /* Get NAND clock */
 702         host->clk = clk_get(&pdev->dev, NULL);
 703         if (IS_ERR(host->clk)) {
 704                 dev_err(&pdev->dev, "Clock initialization failure\n");
 705                 res = -ENOENT;
 706                 goto err_exit1;
 707         }
 708         clk_prepare_enable(host->clk);
 709
 710         nand_chip->cmd_ctrl = lpc32xx_nand_cmd_ctrl;
 711         nand_chip->dev_ready = lpc32xx_nand_device_ready;
 712         nand_chip->chip_delay = 25; /* us */
 713         nand_chip->IO_ADDR_R = MLC_DATA(host->io_base);
 714         nand_chip->IO_ADDR_W = MLC_DATA(host->io_base);
 715
 716         /* Init NAND controller */
 717         lpc32xx_nand_setup(host);
 718
 719         platform_set_drvdata(pdev, host);
 720
 721         /* Initialize function pointers */
 722         nand_chip->ecc.hwctl = lpc32xx_ecc_enable;
 723         nand_chip->ecc.read_page_raw = lpc32xx_read_page;
 724         nand_chip->ecc.read_page = lpc32xx_read_page;
 725         nand_chip->ecc.write_page_raw = lpc32xx_write_page_lowlevel;
 726         nand_chip->ecc.write_page = lpc32xx_write_page_lowlevel;
 727         nand_chip->ecc.write_oob = lpc32xx_write_oob;
 728         nand_chip->ecc.read_oob = lpc32xx_read_oob;
 729         nand_chip->ecc.strength = 4;
 730         nand_chip->ecc.bytes = 10;
 731         nand_chip->waitfunc = lpc32xx_waitfunc;
 732
 733         nand_chip->options = NAND_NO_SUBPAGE_WRITE;
 734         nand_chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
 735         nand_chip->bbt_td = &lpc32xx_nand_bbt;
 736         nand_chip->bbt_md = &lpc32xx_nand_bbt_mirror;
 737
 738         if (use_dma) {
 739                 res = lpc32xx_dma_setup(host);
 740                 if (res) {
 741                         res = -EIO;
 742                         goto err_exit2;
 743                 }
 744         }
 745
 746         /*
 747          * Scan to find existance of the device and
 748          * Get the type of NAND device SMALL block or LARGE block
 749          */
 750         res = nand_scan_ident(mtd, 1, NULL);
 751         if (res)
 752                 goto err_exit3;
 753
 754         host->dma_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
 755         if (!host->dma_buf) {
 756                 res = -ENOMEM;
 757                 goto err_exit3;
 758         }
 759
 760         host->dummy_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
 761         if (!host->dummy_buf) {
 762                 res = -ENOMEM;
 763                 goto err_exit3;
 764         }
 765
 766         nand_chip->ecc.mode = NAND_ECC_HW;
 767         nand_chip->ecc.size = 512;
 768         mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 769         host->mlcsubpages = mtd->writesize / 512;
 770
 771         /* initially clear interrupt status */
 772         readb(MLC_IRQ_SR(host->io_base));
 773
 774         init_completion(&host->comp_nand);
 775         init_completion(&host->comp_controller);
 776
 777         host->irq = platform_get_irq(pdev, 0);
 778         if (host->irq < 0) {
 779                 dev_err(&pdev->dev, "failed to get platform irq\n");
 780                 res = -EINVAL;
 781                 goto err_exit3;
 782         }
 783
 784         if (request_irq(host->irq, (irq_handler_t)&lpc3xxx_nand_irq,
 785                         IRQF_TRIGGER_HIGH, DRV_NAME, host)) {
 786                 dev_err(&pdev->dev, "Error requesting NAND IRQ\n");
 787                 res = -ENXIO;
 788                 goto err_exit3;
 789         }
 790
 791         /*
 792          * Fills out all the uninitialized function pointers with the defaults
 793          * And scans for a bad block table if appropriate.
 794          */
 795         res = nand_scan_tail(mtd);
 796         if (res)
 797                 goto err_exit4;
 798
 799         mtd->name = DRV_NAME;
 800
 801         res = mtd_device_register(mtd, host->ncfg->parts,
 802                                   host->ncfg->num_parts);
 803         if (!res)
 804                 return res;
 805
 806         nand_release(mtd);
 807
 808 err_exit4:
 809         free_irq(host->irq, host);
 810 err_exit3:
 811         if (use_dma)
 812                 dma_release_channel(host->dma_chan);
 813 err_exit2:
 814         clk_disable_unprepare(host->clk);
 815         clk_put(host->clk);
 816 err_exit1:
 817         lpc32xx_wp_enable(host);
 818         gpio_free(host->ncfg->wp_gpio);
 819
 820         return res;
 821 }
 822
 823 /*
 824  * Remove NAND device
 825  */
 826 static int lpc32xx_nand_remove(struct platform_device *pdev)
 827 {
 828         struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 829         struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);
 830
 831         nand_release(mtd);
 832         free_irq(host->irq, host);
 833         if (use_dma)
 834                 dma_release_channel(host->dma_chan);
 835
 836         clk_disable_unprepare(host->clk);
 837         clk_put(host->clk);
 838
 839         lpc32xx_wp_enable(host);
 840         gpio_free(host->ncfg->wp_gpio);
 841
 842         return 0;
 843 }
 844
 845 #ifdef CONFIG_PM
 846 static int lpc32xx_nand_resume(struct platform_device *pdev)
 847 {
 848         struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 849
 850         /* Re-enable NAND clock */
 851         clk_prepare_enable(host->clk);
 852
 853         /* Fresh init of NAND controller */
 854         lpc32xx_nand_setup(host);
 855
 856         /* Disable write protect */
 857         lpc32xx_wp_disable(host);
 858
 859         return 0;
 860 }
 861
 862 static int lpc32xx_nand_suspend(struct platform_device *pdev, pm_message_t pm)
 863 {
 864         struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 865
 866         /* Enable write protect for safety */
 867         lpc32xx_wp_enable(host);
 868
 869         /* Disable clock */
 870         clk_disable_unprepare(host->clk);
 871         return 0;
 872 }
 873
 874 #else
 875 #define lpc32xx_nand_resume NULL
 876 #define lpc32xx_nand_suspend NULL
 877 #endif
 878
 879 static const struct of_device_id lpc32xx_nand_match[] = {
 880         { .compatible = "nxp,lpc3220-mlc" },
 881         { /* sentinel */ },
 882 };
 883 MODULE_DEVICE_TABLE(of, lpc32xx_nand_match);
 884
 885 static struct platform_driver lpc32xx_nand_driver = {
 886         .probe          = lpc32xx_nand_probe,
 887         .remove         = lpc32xx_nand_remove,
 888         .resume         = lpc32xx_nand_resume,
 889         .suspend        = lpc32xx_nand_suspend,
 890         .driver         = {
 891                 .name   = DRV_NAME,
 892                 .of_match_table = lpc32xx_nand_match,
 893         },
 894 };
 895
 896 module_platform_driver(lpc32xx_nand_driver);
 897
 898 MODULE_LICENSE("GPL");
 899 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 900 MODULE_DESCRIPTION("NAND driver for the NXP LPC32XX MLC controller");