drivers/mtd/nand/sh_flctl.c

   1 /*
   2  * SuperH FLCTL nand controller
   3  *
   4  * Copyright (c) 2008 Renesas Solutions Corp.
   5  * Copyright (c) 2008 Atom Create Engineering Co., Ltd.
   6  *
   7  * Based on fsl_elbc_nand.c, Copyright (c) 2006-2007 Freescale Semiconductor
   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; version 2 of the License.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/completion.h>
  27 #include <linux/delay.h>
  28 #include <linux/dmaengine.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/io.h>
  32 #include <linux/of.h>
  33 #include <linux/of_device.h>
  34 #include <linux/of_mtd.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/pm_runtime.h>
  37 #include <linux/sh_dma.h>
  38 #include <linux/slab.h>
  39 #include <linux/string.h>
  40
  41 #include <linux/mtd/mtd.h>
  42 #include <linux/mtd/nand.h>
  43 #include <linux/mtd/partitions.h>
  44 #include <linux/mtd/sh_flctl.h>
  45
  46 static struct nand_ecclayout flctl_4secc_oob_16 = {
  47         .eccbytes = 10,
  48         .eccpos = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
  49         .oobfree = {
  50                 {.offset = 12,
  51                 . length = 4} },
  52 };
  53
  54 static struct nand_ecclayout flctl_4secc_oob_64 = {
  55         .eccbytes = 4 * 10,
  56         .eccpos = {
  57                  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
  58                 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  59                 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  60                 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
  61         .oobfree = {
  62                 {.offset =  2, .length = 4},
  63                 {.offset = 16, .length = 6},
  64                 {.offset = 32, .length = 6},
  65                 {.offset = 48, .length = 6} },
  66 };
  67
  68 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
  69
  70 static struct nand_bbt_descr flctl_4secc_smallpage = {
  71         .options = NAND_BBT_SCAN2NDPAGE,
  72         .offs = 11,
  73         .len = 1,
  74         .pattern = scan_ff_pattern,
  75 };
  76
  77 static struct nand_bbt_descr flctl_4secc_largepage = {
  78         .options = NAND_BBT_SCAN2NDPAGE,
  79         .offs = 0,
  80         .len = 2,
  81         .pattern = scan_ff_pattern,
  82 };
  83
  84 static void empty_fifo(struct sh_flctl *flctl)
  85 {
  86         writel(flctl->flintdmacr_base | AC1CLR | AC0CLR, FLINTDMACR(flctl));
  87         writel(flctl->flintdmacr_base, FLINTDMACR(flctl));
  88 }
  89
  90 static void start_translation(struct sh_flctl *flctl)
  91 {
  92         writeb(TRSTRT, FLTRCR(flctl));
  93 }
  94
  95 static void timeout_error(struct sh_flctl *flctl, const char *str)
  96 {
  97         dev_err(&flctl->pdev->dev, "Timeout occurred in %s\n", str);
  98 }
  99
 100 static void wait_completion(struct sh_flctl *flctl)
 101 {
 102         uint32_t timeout = LOOP_TIMEOUT_MAX;
 103
 104         while (timeout--) {
 105                 if (readb(FLTRCR(flctl)) & TREND) {
 106                         writeb(0x0, FLTRCR(flctl));
 107                         return;
 108                 }
 109                 udelay(1);
 110         }
 111
 112         timeout_error(flctl, __func__);
 113         writeb(0x0, FLTRCR(flctl));
 114 }
 115
 116 static void flctl_dma_complete(void *param)
 117 {
 118         struct sh_flctl *flctl = param;
 119
 120         complete(&flctl->dma_complete);
 121 }
 122
 123 static void flctl_release_dma(struct sh_flctl *flctl)
 124 {
 125         if (flctl->chan_fifo0_rx) {
 126                 dma_release_channel(flctl->chan_fifo0_rx);
 127                 flctl->chan_fifo0_rx = NULL;
 128         }
 129         if (flctl->chan_fifo0_tx) {
 130                 dma_release_channel(flctl->chan_fifo0_tx);
 131                 flctl->chan_fifo0_tx = NULL;
 132         }
 133 }
 134
 135 static void flctl_setup_dma(struct sh_flctl *flctl)
 136 {
 137         dma_cap_mask_t mask;
 138         struct dma_slave_config cfg;
 139         struct platform_device *pdev = flctl->pdev;
 140         struct sh_flctl_platform_data *pdata = pdev->dev.platform_data;
 141         int ret;
 142
 143         if (!pdata)
 144                 return;
 145
 146         if (pdata->slave_id_fifo0_tx <= 0 || pdata->slave_id_fifo0_rx <= 0)
 147                 return;
 148
 149         /* We can only either use DMA for both Tx and Rx or not use it at all */
 150         dma_cap_zero(mask);
 151         dma_cap_set(DMA_SLAVE, mask);
 152
 153         flctl->chan_fifo0_tx = dma_request_channel(mask, shdma_chan_filter,
 154                                             (void *)pdata->slave_id_fifo0_tx);
 155         dev_dbg(&pdev->dev, "%s: TX: got channel %p\n", __func__,
 156                 flctl->chan_fifo0_tx);
 157
 158         if (!flctl->chan_fifo0_tx)
 159                 return;
 160
 161         memset(&cfg, 0, sizeof(cfg));
 162         cfg.slave_id = pdata->slave_id_fifo0_tx;
 163         cfg.direction = DMA_MEM_TO_DEV;
 164         cfg.dst_addr = (dma_addr_t)FLDTFIFO(flctl);
 165         cfg.src_addr = 0;
 166         ret = dmaengine_slave_config(flctl->chan_fifo0_tx, &cfg);
 167         if (ret < 0)
 168                 goto err;
 169
 170         flctl->chan_fifo0_rx = dma_request_channel(mask, shdma_chan_filter,
 171                                             (void *)pdata->slave_id_fifo0_rx);
 172         dev_dbg(&pdev->dev, "%s: RX: got channel %p\n", __func__,
 173                 flctl->chan_fifo0_rx);
 174
 175         if (!flctl->chan_fifo0_rx)
 176                 goto err;
 177
 178         cfg.slave_id = pdata->slave_id_fifo0_rx;
 179         cfg.direction = DMA_DEV_TO_MEM;
 180         cfg.dst_addr = 0;
 181         cfg.src_addr = (dma_addr_t)FLDTFIFO(flctl);
 182         ret = dmaengine_slave_config(flctl->chan_fifo0_rx, &cfg);
 183         if (ret < 0)
 184                 goto err;
 185
 186         init_completion(&flctl->dma_complete);
 187
 188         return;
 189
 190 err:
 191         flctl_release_dma(flctl);
 192 }
 193
 194 static void set_addr(struct mtd_info *mtd, int column, int page_addr)
 195 {
 196         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 197         uint32_t addr = 0;
 198
 199         if (column == -1) {
 200                 addr = page_addr;       /* ERASE1 */
 201         } else if (page_addr != -1) {
 202                 /* SEQIN, READ0, etc.. */
 203                 if (flctl->chip.options & NAND_BUSWIDTH_16)
 204                         column >>= 1;
 205                 if (flctl->page_size) {
 206                         addr = column & 0x0FFF;
 207                         addr |= (page_addr & 0xff) << 16;
 208                         addr |= ((page_addr >> 8) & 0xff) << 24;
 209                         /* big than 128MB */
 210                         if (flctl->rw_ADRCNT == ADRCNT2_E) {
 211                                 uint32_t        addr2;
 212                                 addr2 = (page_addr >> 16) & 0xff;
 213                                 writel(addr2, FLADR2(flctl));
 214                         }
 215                 } else {
 216                         addr = column;
 217                         addr |= (page_addr & 0xff) << 8;
 218                         addr |= ((page_addr >> 8) & 0xff) << 16;
 219                         addr |= ((page_addr >> 16) & 0xff) << 24;
 220                 }
 221         }
 222         writel(addr, FLADR(flctl));
 223 }
 224
 225 static void wait_rfifo_ready(struct sh_flctl *flctl)
 226 {
 227         uint32_t timeout = LOOP_TIMEOUT_MAX;
 228
 229         while (timeout--) {
 230                 uint32_t val;
 231                 /* check FIFO */
 232                 val = readl(FLDTCNTR(flctl)) >> 16;
 233                 if (val & 0xFF)
 234                         return;
 235                 udelay(1);
 236         }
 237         timeout_error(flctl, __func__);
 238 }
 239
 240 static void wait_wfifo_ready(struct sh_flctl *flctl)
 241 {
 242         uint32_t len, timeout = LOOP_TIMEOUT_MAX;
 243
 244         while (timeout--) {
 245                 /* check FIFO */
 246                 len = (readl(FLDTCNTR(flctl)) >> 16) & 0xFF;
 247                 if (len >= 4)
 248                         return;
 249                 udelay(1);
 250         }
 251         timeout_error(flctl, __func__);
 252 }
 253
 254 static enum flctl_ecc_res_t wait_recfifo_ready
 255                 (struct sh_flctl *flctl, int sector_number)
 256 {
 257         uint32_t timeout = LOOP_TIMEOUT_MAX;
 258         void __iomem *ecc_reg[4];
 259         int i;
 260         int state = FL_SUCCESS;
 261         uint32_t data, size;
 262
 263         /*
 264          * First this loops checks in FLDTCNTR if we are ready to read out the
 265          * oob data. This is the case if either all went fine without errors or
 266          * if the bottom part of the loop corrected the errors or marked them as
 267          * uncorrectable and the controller is given time to push the data into
 268          * the FIFO.
 269          */
 270         while (timeout--) {
 271                 /* check if all is ok and we can read out the OOB */
 272                 size = readl(FLDTCNTR(flctl)) >> 24;
 273                 if ((size & 0xFF) == 4)
 274                         return state;
 275
 276                 /* check if a correction code has been calculated */
 277                 if (!(readl(FL4ECCCR(flctl)) & _4ECCEND)) {
 278                         /*
 279                          * either we wait for the fifo to be filled or a
 280                          * correction pattern is being generated
 281                          */
 282                         udelay(1);
 283                         continue;
 284                 }
 285
 286                 /* check for an uncorrectable error */
 287                 if (readl(FL4ECCCR(flctl)) & _4ECCFA) {
 288                         /* check if we face a non-empty page */
 289                         for (i = 0; i < 512; i++) {
 290                                 if (flctl->done_buff[i] != 0xff) {
 291                                         state = FL_ERROR; /* can't correct */
 292                                         break;
 293                                 }
 294                         }
 295
 296                         if (state == FL_SUCCESS)
 297                                 dev_dbg(&flctl->pdev->dev,
 298                                 "reading empty sector %d, ecc error ignored\n",
 299                                 sector_number);
 300
 301                         writel(0, FL4ECCCR(flctl));
 302                         continue;
 303                 }
 304
 305                 /* start error correction */
 306                 ecc_reg[0] = FL4ECCRESULT0(flctl);
 307                 ecc_reg[1] = FL4ECCRESULT1(flctl);
 308                 ecc_reg[2] = FL4ECCRESULT2(flctl);
 309                 ecc_reg[3] = FL4ECCRESULT3(flctl);
 310
 311                 for (i = 0; i < 3; i++) {
 312                         uint8_t org;
 313                         unsigned int index;
 314
 315                         data = readl(ecc_reg[i]);
 316
 317                         if (flctl->page_size)
 318                                 index = (512 * sector_number) +
 319                                         (data >> 16);
 320                         else
 321                                 index = data >> 16;
 322
 323                         org = flctl->done_buff[index];
 324                         flctl->done_buff[index] = org ^ (data & 0xFF);
 325                 }
 326                 state = FL_REPAIRABLE;
 327                 writel(0, FL4ECCCR(flctl));
 328         }
 329
 330         timeout_error(flctl, __func__);
 331         return FL_TIMEOUT;      /* timeout */
 332 }
 333
 334 static void wait_wecfifo_ready(struct sh_flctl *flctl)
 335 {
 336         uint32_t timeout = LOOP_TIMEOUT_MAX;
 337         uint32_t len;
 338
 339         while (timeout--) {
 340                 /* check FLECFIFO */
 341                 len = (readl(FLDTCNTR(flctl)) >> 24) & 0xFF;
 342                 if (len >= 4)
 343                         return;
 344                 udelay(1);
 345         }
 346         timeout_error(flctl, __func__);
 347 }
 348
 349 static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf,
 350                                         int len, enum dma_data_direction dir)
 351 {
 352         struct dma_async_tx_descriptor *desc = NULL;
 353         struct dma_chan *chan;
 354         enum dma_transfer_direction tr_dir;
 355         dma_addr_t dma_addr;
 356         dma_cookie_t cookie = -EINVAL;
 357         uint32_t reg;
 358         int ret;
 359
 360         if (dir == DMA_FROM_DEVICE) {
 361                 chan = flctl->chan_fifo0_rx;
 362                 tr_dir = DMA_DEV_TO_MEM;
 363         } else {
 364                 chan = flctl->chan_fifo0_tx;
 365                 tr_dir = DMA_MEM_TO_DEV;
 366         }
 367
 368         dma_addr = dma_map_single(chan->device->dev, buf, len, dir);
 369
 370         if (dma_addr)
 371                 desc = dmaengine_prep_slave_single(chan, dma_addr, len,
 372                         tr_dir, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 373
 374         if (desc) {
 375                 reg = readl(FLINTDMACR(flctl));
 376                 reg |= DREQ0EN;
 377                 writel(reg, FLINTDMACR(flctl));
 378
 379                 desc->callback = flctl_dma_complete;
 380                 desc->callback_param = flctl;
 381                 cookie = dmaengine_submit(desc);
 382
 383                 dma_async_issue_pending(chan);
 384         } else {
 385                 /* DMA failed, fall back to PIO */
 386                 flctl_release_dma(flctl);
 387                 dev_warn(&flctl->pdev->dev,
 388                          "DMA failed, falling back to PIO\n");
 389                 ret = -EIO;
 390                 goto out;
 391         }
 392
 393         ret =
 394         wait_for_completion_timeout(&flctl->dma_complete,
 395                                 msecs_to_jiffies(3000));
 396
 397         if (ret <= 0) {
 398                 chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
 399                 dev_err(&flctl->pdev->dev, "wait_for_completion_timeout\n");
 400         }
 401
 402 out:
 403         reg = readl(FLINTDMACR(flctl));
 404         reg &= ~DREQ0EN;
 405         writel(reg, FLINTDMACR(flctl));
 406
 407         dma_unmap_single(chan->device->dev, dma_addr, len, dir);
 408
 409         /* ret > 0 is success */
 410         return ret;
 411 }
 412
 413 static void read_datareg(struct sh_flctl *flctl, int offset)
 414 {
 415         unsigned long data;
 416         unsigned long *buf = (unsigned long *)&flctl->done_buff[offset];
 417
 418         wait_completion(flctl);
 419
 420         data = readl(FLDATAR(flctl));
 421         *buf = le32_to_cpu(data);
 422 }
 423
 424 static void read_fiforeg(struct sh_flctl *flctl, int rlen, int offset)
 425 {
 426         int i, len_4align;
 427         unsigned long *buf = (unsigned long *)&flctl->done_buff[offset];
 428
 429         len_4align = (rlen + 3) / 4;
 430
 431         /* initiate DMA transfer */
 432         if (flctl->chan_fifo0_rx && rlen >= 32 &&
 433                 flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_DEV_TO_MEM) > 0)
 434                         goto convert;   /* DMA success */
 435
 436         /* do polling transfer */
 437         for (i = 0; i < len_4align; i++) {
 438                 wait_rfifo_ready(flctl);
 439                 buf[i] = readl(FLDTFIFO(flctl));
 440         }
 441
 442 convert:
 443         for (i = 0; i < len_4align; i++)
 444                 buf[i] = be32_to_cpu(buf[i]);
 445 }
 446
 447 static enum flctl_ecc_res_t read_ecfiforeg
 448                 (struct sh_flctl *flctl, uint8_t *buff, int sector)
 449 {
 450         int i;
 451         enum flctl_ecc_res_t res;
 452         unsigned long *ecc_buf = (unsigned long *)buff;
 453
 454         res = wait_recfifo_ready(flctl , sector);
 455
 456         if (res != FL_ERROR) {
 457                 for (i = 0; i < 4; i++) {
 458                         ecc_buf[i] = readl(FLECFIFO(flctl));
 459                         ecc_buf[i] = be32_to_cpu(ecc_buf[i]);
 460                 }
 461         }
 462
 463         return res;
 464 }
 465
 466 static void write_fiforeg(struct sh_flctl *flctl, int rlen,
 467                                                 unsigned int offset)
 468 {
 469         int i, len_4align;
 470         unsigned long *buf = (unsigned long *)&flctl->done_buff[offset];
 471
 472         len_4align = (rlen + 3) / 4;
 473         for (i = 0; i < len_4align; i++) {
 474                 wait_wfifo_ready(flctl);
 475                 writel(cpu_to_be32(buf[i]), FLDTFIFO(flctl));
 476         }
 477 }
 478
 479 static void write_ec_fiforeg(struct sh_flctl *flctl, int rlen,
 480                                                 unsigned int offset)
 481 {
 482         int i, len_4align;
 483         unsigned long *buf = (unsigned long *)&flctl->done_buff[offset];
 484
 485         len_4align = (rlen + 3) / 4;
 486
 487         for (i = 0; i < len_4align; i++)
 488                 buf[i] = cpu_to_be32(buf[i]);
 489
 490         /* initiate DMA transfer */
 491         if (flctl->chan_fifo0_tx && rlen >= 32 &&
 492                 flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_MEM_TO_DEV) > 0)
 493                         return; /* DMA success */
 494
 495         /* do polling transfer */
 496         for (i = 0; i < len_4align; i++) {
 497                 wait_wecfifo_ready(flctl);
 498                 writel(buf[i], FLECFIFO(flctl));
 499         }
 500 }
 501
 502 static void set_cmd_regs(struct mtd_info *mtd, uint32_t cmd, uint32_t flcmcdr_val)
 503 {
 504         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 505         uint32_t flcmncr_val = flctl->flcmncr_base & ~SEL_16BIT;
 506         uint32_t flcmdcr_val, addr_len_bytes = 0;
 507
 508         /* Set SNAND bit if page size is 2048byte */
 509         if (flctl->page_size)
 510                 flcmncr_val |= SNAND_E;
 511         else
 512                 flcmncr_val &= ~SNAND_E;
 513
 514         /* default FLCMDCR val */
 515         flcmdcr_val = DOCMD1_E | DOADR_E;
 516
 517         /* Set for FLCMDCR */
 518         switch (cmd) {
 519         case NAND_CMD_ERASE1:
 520                 addr_len_bytes = flctl->erase_ADRCNT;
 521                 flcmdcr_val |= DOCMD2_E;
 522                 break;
 523         case NAND_CMD_READ0:
 524         case NAND_CMD_READOOB:
 525         case NAND_CMD_RNDOUT:
 526                 addr_len_bytes = flctl->rw_ADRCNT;
 527                 flcmdcr_val |= CDSRC_E;
 528                 if (flctl->chip.options & NAND_BUSWIDTH_16)
 529                         flcmncr_val |= SEL_16BIT;
 530                 break;
 531         case NAND_CMD_SEQIN:
 532                 /* This case is that cmd is READ0 or READ1 or READ00 */
 533                 flcmdcr_val &= ~DOADR_E;        /* ONLY execute 1st cmd */
 534                 break;
 535         case NAND_CMD_PAGEPROG:
 536                 addr_len_bytes = flctl->rw_ADRCNT;
 537                 flcmdcr_val |= DOCMD2_E | CDSRC_E | SELRW;
 538                 if (flctl->chip.options & NAND_BUSWIDTH_16)
 539                         flcmncr_val |= SEL_16BIT;
 540                 break;
 541         case NAND_CMD_READID:
 542                 flcmncr_val &= ~SNAND_E;
 543                 flcmdcr_val |= CDSRC_E;
 544                 addr_len_bytes = ADRCNT_1;
 545                 break;
 546         case NAND_CMD_STATUS:
 547         case NAND_CMD_RESET:
 548                 flcmncr_val &= ~SNAND_E;
 549                 flcmdcr_val &= ~(DOADR_E | DOSR_E);
 550                 break;
 551         default:
 552                 break;
 553         }
 554
 555         /* Set address bytes parameter */
 556         flcmdcr_val |= addr_len_bytes;
 557
 558         /* Now actually write */
 559         writel(flcmncr_val, FLCMNCR(flctl));
 560         writel(flcmdcr_val, FLCMDCR(flctl));
 561         writel(flcmcdr_val, FLCMCDR(flctl));
 562 }
 563
 564 static int flctl_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 565                                 uint8_t *buf, int oob_required, int page)
 566 {
 567         chip->read_buf(mtd, buf, mtd->writesize);
 568         if (oob_required)
 569                 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 570         return 0;
 571 }
 572
 573 static int flctl_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 574                                    const uint8_t *buf, int oob_required)
 575 {
 576         chip->write_buf(mtd, buf, mtd->writesize);
 577         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 578         return 0;
 579 }
 580
 581 static void execmd_read_page_sector(struct mtd_info *mtd, int page_addr)
 582 {
 583         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 584         int sector, page_sectors;
 585         enum flctl_ecc_res_t ecc_result;
 586
 587         page_sectors = flctl->page_size ? 4 : 1;
 588
 589         set_cmd_regs(mtd, NAND_CMD_READ0,
 590                 (NAND_CMD_READSTART << 8) | NAND_CMD_READ0);
 591
 592         writel(readl(FLCMNCR(flctl)) | ACM_SACCES_MODE | _4ECCCORRECT,
 593                  FLCMNCR(flctl));
 594         writel(readl(FLCMDCR(flctl)) | page_sectors, FLCMDCR(flctl));
 595         writel(page_addr << 2, FLADR(flctl));
 596
 597         empty_fifo(flctl);
 598         start_translation(flctl);
 599
 600         for (sector = 0; sector < page_sectors; sector++) {
 601                 read_fiforeg(flctl, 512, 512 * sector);
 602
 603                 ecc_result = read_ecfiforeg(flctl,
 604                         &flctl->done_buff[mtd->writesize + 16 * sector],
 605                         sector);
 606
 607                 switch (ecc_result) {
 608                 case FL_REPAIRABLE:
 609                         dev_info(&flctl->pdev->dev,
 610                                 "applied ecc on page 0x%x", page_addr);
 611                         flctl->mtd.ecc_stats.corrected++;
 612                         break;
 613                 case FL_ERROR:
 614                         dev_warn(&flctl->pdev->dev,
 615                                 "page 0x%x contains corrupted data\n",
 616                                 page_addr);
 617                         flctl->mtd.ecc_stats.failed++;
 618                         break;
 619                 default:
 620                         ;
 621                 }
 622         }
 623
 624         wait_completion(flctl);
 625
 626         writel(readl(FLCMNCR(flctl)) & ~(ACM_SACCES_MODE | _4ECCCORRECT),
 627                         FLCMNCR(flctl));
 628 }
 629
 630 static void execmd_read_oob(struct mtd_info *mtd, int page_addr)
 631 {
 632         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 633         int page_sectors = flctl->page_size ? 4 : 1;
 634         int i;
 635
 636         set_cmd_regs(mtd, NAND_CMD_READ0,
 637                 (NAND_CMD_READSTART << 8) | NAND_CMD_READ0);
 638
 639         empty_fifo(flctl);
 640
 641         for (i = 0; i < page_sectors; i++) {
 642                 set_addr(mtd, (512 + 16) * i + 512 , page_addr);
 643                 writel(16, FLDTCNTR(flctl));
 644
 645                 start_translation(flctl);
 646                 read_fiforeg(flctl, 16, 16 * i);
 647                 wait_completion(flctl);
 648         }
 649 }
 650
 651 static void execmd_write_page_sector(struct mtd_info *mtd)
 652 {
 653         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 654         int page_addr = flctl->seqin_page_addr;
 655         int sector, page_sectors;
 656
 657         page_sectors = flctl->page_size ? 4 : 1;
 658
 659         set_cmd_regs(mtd, NAND_CMD_PAGEPROG,
 660                         (NAND_CMD_PAGEPROG << 8) | NAND_CMD_SEQIN);
 661
 662         empty_fifo(flctl);
 663         writel(readl(FLCMNCR(flctl)) | ACM_SACCES_MODE, FLCMNCR(flctl));
 664         writel(readl(FLCMDCR(flctl)) | page_sectors, FLCMDCR(flctl));
 665         writel(page_addr << 2, FLADR(flctl));
 666         start_translation(flctl);
 667
 668         for (sector = 0; sector < page_sectors; sector++) {
 669                 write_fiforeg(flctl, 512, 512 * sector);
 670                 write_ec_fiforeg(flctl, 16, mtd->writesize + 16 * sector);
 671         }
 672
 673         wait_completion(flctl);
 674         writel(readl(FLCMNCR(flctl)) & ~ACM_SACCES_MODE, FLCMNCR(flctl));
 675 }
 676
 677 static void execmd_write_oob(struct mtd_info *mtd)
 678 {
 679         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 680         int page_addr = flctl->seqin_page_addr;
 681         int sector, page_sectors;
 682
 683         page_sectors = flctl->page_size ? 4 : 1;
 684
 685         set_cmd_regs(mtd, NAND_CMD_PAGEPROG,
 686                         (NAND_CMD_PAGEPROG << 8) | NAND_CMD_SEQIN);
 687
 688         for (sector = 0; sector < page_sectors; sector++) {
 689                 empty_fifo(flctl);
 690                 set_addr(mtd, sector * 528 + 512, page_addr);
 691                 writel(16, FLDTCNTR(flctl));    /* set read size */
 692
 693                 start_translation(flctl);
 694                 write_fiforeg(flctl, 16, 16 * sector);
 695                 wait_completion(flctl);
 696         }
 697 }
 698
 699 static void flctl_cmdfunc(struct mtd_info *mtd, unsigned int command,
 700                         int column, int page_addr)
 701 {
 702         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 703         uint32_t read_cmd = 0;
 704
 705         pm_runtime_get_sync(&flctl->pdev->dev);
 706
 707         flctl->read_bytes = 0;
 708         if (command != NAND_CMD_PAGEPROG)
 709                 flctl->index = 0;
 710
 711         switch (command) {
 712         case NAND_CMD_READ1:
 713         case NAND_CMD_READ0:
 714                 if (flctl->hwecc) {
 715                         /* read page with hwecc */
 716                         execmd_read_page_sector(mtd, page_addr);
 717                         break;
 718                 }
 719                 if (flctl->page_size)
 720                         set_cmd_regs(mtd, command, (NAND_CMD_READSTART << 8)
 721                                 | command);
 722                 else
 723                         set_cmd_regs(mtd, command, command);
 724
 725                 set_addr(mtd, 0, page_addr);
 726
 727                 flctl->read_bytes = mtd->writesize + mtd->oobsize;
 728                 if (flctl->chip.options & NAND_BUSWIDTH_16)
 729                         column >>= 1;
 730                 flctl->index += column;
 731                 goto read_normal_exit;
 732
 733         case NAND_CMD_READOOB:
 734                 if (flctl->hwecc) {
 735                         /* read page with hwecc */
 736                         execmd_read_oob(mtd, page_addr);
 737                         break;
 738                 }
 739
 740                 if (flctl->page_size) {
 741                         set_cmd_regs(mtd, command, (NAND_CMD_READSTART << 8)
 742                                 | NAND_CMD_READ0);
 743                         set_addr(mtd, mtd->writesize, page_addr);
 744                 } else {
 745                         set_cmd_regs(mtd, command, command);
 746                         set_addr(mtd, 0, page_addr);
 747                 }
 748                 flctl->read_bytes = mtd->oobsize;
 749                 goto read_normal_exit;
 750
 751         case NAND_CMD_RNDOUT:
 752                 if (flctl->hwecc)
 753                         break;
 754
 755                 if (flctl->page_size)
 756                         set_cmd_regs(mtd, command, (NAND_CMD_RNDOUTSTART << 8)
 757                                 | command);
 758                 else
 759                         set_cmd_regs(mtd, command, command);
 760
 761                 set_addr(mtd, column, 0);
 762
 763                 flctl->read_bytes = mtd->writesize + mtd->oobsize - column;
 764                 goto read_normal_exit;
 765
 766         case NAND_CMD_READID:
 767                 set_cmd_regs(mtd, command, command);
 768
 769                 /* READID is always performed using an 8-bit bus */
 770                 if (flctl->chip.options & NAND_BUSWIDTH_16)
 771                         column <<= 1;
 772                 set_addr(mtd, column, 0);
 773
 774                 flctl->read_bytes = 8;
 775                 writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */
 776                 empty_fifo(flctl);
 777                 start_translation(flctl);
 778                 read_fiforeg(flctl, flctl->read_bytes, 0);
 779                 wait_completion(flctl);
 780                 break;
 781
 782         case NAND_CMD_ERASE1:
 783                 flctl->erase1_page_addr = page_addr;
 784                 break;
 785
 786         case NAND_CMD_ERASE2:
 787                 set_cmd_regs(mtd, NAND_CMD_ERASE1,
 788                         (command << 8) | NAND_CMD_ERASE1);
 789                 set_addr(mtd, -1, flctl->erase1_page_addr);
 790                 start_translation(flctl);
 791                 wait_completion(flctl);
 792                 break;
 793
 794         case NAND_CMD_SEQIN:
 795                 if (!flctl->page_size) {
 796                         /* output read command */
 797                         if (column >= mtd->writesize) {
 798                                 column -= mtd->writesize;
 799                                 read_cmd = NAND_CMD_READOOB;
 800                         } else if (column < 256) {
 801                                 read_cmd = NAND_CMD_READ0;
 802                         } else {
 803                                 column -= 256;
 804                                 read_cmd = NAND_CMD_READ1;
 805                         }
 806                 }
 807                 flctl->seqin_column = column;
 808                 flctl->seqin_page_addr = page_addr;
 809                 flctl->seqin_read_cmd = read_cmd;
 810                 break;
 811
 812         case NAND_CMD_PAGEPROG:
 813                 empty_fifo(flctl);
 814                 if (!flctl->page_size) {
 815                         set_cmd_regs(mtd, NAND_CMD_SEQIN,
 816                                         flctl->seqin_read_cmd);
 817                         set_addr(mtd, -1, -1);
 818                         writel(0, FLDTCNTR(flctl));     /* set 0 size */
 819                         start_translation(flctl);
 820                         wait_completion(flctl);
 821                 }
 822                 if (flctl->hwecc) {
 823                         /* write page with hwecc */
 824                         if (flctl->seqin_column == mtd->writesize)
 825                                 execmd_write_oob(mtd);
 826                         else if (!flctl->seqin_column)
 827                                 execmd_write_page_sector(mtd);
 828                         else
 829                                 printk(KERN_ERR "Invalid address !?\n");
 830                         break;
 831                 }
 832                 set_cmd_regs(mtd, command, (command << 8) | NAND_CMD_SEQIN);
 833                 set_addr(mtd, flctl->seqin_column, flctl->seqin_page_addr);
 834                 writel(flctl->index, FLDTCNTR(flctl));  /* set write size */
 835                 start_translation(flctl);
 836                 write_fiforeg(flctl, flctl->index, 0);
 837                 wait_completion(flctl);
 838                 break;
 839
 840         case NAND_CMD_STATUS:
 841                 set_cmd_regs(mtd, command, command);
 842                 set_addr(mtd, -1, -1);
 843
 844                 flctl->read_bytes = 1;
 845                 writel(flctl->read_bytes, FLDTCNTR(flctl)); /* set read size */
 846                 start_translation(flctl);
 847                 read_datareg(flctl, 0); /* read and end */
 848                 break;
 849
 850         case NAND_CMD_RESET:
 851                 set_cmd_regs(mtd, command, command);
 852                 set_addr(mtd, -1, -1);
 853
 854                 writel(0, FLDTCNTR(flctl));     /* set 0 size */
 855                 start_translation(flctl);
 856                 wait_completion(flctl);
 857                 break;
 858
 859         default:
 860                 break;
 861         }
 862         goto runtime_exit;
 863
 864 read_normal_exit:
 865         writel(flctl->read_bytes, FLDTCNTR(flctl));     /* set read size */
 866         empty_fifo(flctl);
 867         start_translation(flctl);
 868         read_fiforeg(flctl, flctl->read_bytes, 0);
 869         wait_completion(flctl);
 870 runtime_exit:
 871         pm_runtime_put_sync(&flctl->pdev->dev);
 872         return;
 873 }
 874
 875 static void flctl_select_chip(struct mtd_info *mtd, int chipnr)
 876 {
 877         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 878         int ret;
 879
 880         switch (chipnr) {
 881         case -1:
 882                 flctl->flcmncr_base &= ~CE0_ENABLE;
 883
 884                 pm_runtime_get_sync(&flctl->pdev->dev);
 885                 writel(flctl->flcmncr_base, FLCMNCR(flctl));
 886
 887                 if (flctl->qos_request) {
 888                         dev_pm_qos_remove_request(&flctl->pm_qos);
 889                         flctl->qos_request = 0;
 890                 }
 891
 892                 pm_runtime_put_sync(&flctl->pdev->dev);
 893                 break;
 894         case 0:
 895                 flctl->flcmncr_base |= CE0_ENABLE;
 896
 897                 if (!flctl->qos_request) {
 898                         ret = dev_pm_qos_add_request(&flctl->pdev->dev,
 899                                                         &flctl->pm_qos,
 900                                                         DEV_PM_QOS_LATENCY,
 901                                                         100);
 902                         if (ret < 0)
 903                                 dev_err(&flctl->pdev->dev,
 904                                         "PM QoS request failed: %d\n", ret);
 905                         flctl->qos_request = 1;
 906                 }
 907
 908                 if (flctl->holden) {
 909                         pm_runtime_get_sync(&flctl->pdev->dev);
 910                         writel(HOLDEN, FLHOLDCR(flctl));
 911                         pm_runtime_put_sync(&flctl->pdev->dev);
 912                 }
 913                 break;
 914         default:
 915                 BUG();
 916         }
 917 }
 918
 919 static void flctl_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 920 {
 921         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 922
 923         memcpy(&flctl->done_buff[flctl->index], buf, len);
 924         flctl->index += len;
 925 }
 926
 927 static uint8_t flctl_read_byte(struct mtd_info *mtd)
 928 {
 929         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 930         uint8_t data;
 931
 932         data = flctl->done_buff[flctl->index];
 933         flctl->index++;
 934         return data;
 935 }
 936
 937 static uint16_t flctl_read_word(struct mtd_info *mtd)
 938 {
 939         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 940         uint16_t *buf = (uint16_t *)&flctl->done_buff[flctl->index];
 941
 942         flctl->index += 2;
 943         return *buf;
 944 }
 945
 946 static void flctl_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 947 {
 948         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 949
 950         memcpy(buf, &flctl->done_buff[flctl->index], len);
 951         flctl->index += len;
 952 }
 953
 954 static int flctl_chip_init_tail(struct mtd_info *mtd)
 955 {
 956         struct sh_flctl *flctl = mtd_to_flctl(mtd);
 957         struct nand_chip *chip = &flctl->chip;
 958
 959         if (mtd->writesize == 512) {
 960                 flctl->page_size = 0;
 961                 if (chip->chipsize > (32 << 20)) {
 962                         /* big than 32MB */
 963                         flctl->rw_ADRCNT = ADRCNT_4;
 964                         flctl->erase_ADRCNT = ADRCNT_3;
 965                 } else if (chip->chipsize > (2 << 16)) {
 966                         /* big than 128KB */
 967                         flctl->rw_ADRCNT = ADRCNT_3;
 968                         flctl->erase_ADRCNT = ADRCNT_2;
 969                 } else {
 970                         flctl->rw_ADRCNT = ADRCNT_2;
 971                         flctl->erase_ADRCNT = ADRCNT_1;
 972                 }
 973         } else {
 974                 flctl->page_size = 1;
 975                 if (chip->chipsize > (128 << 20)) {
 976                         /* big than 128MB */
 977                         flctl->rw_ADRCNT = ADRCNT2_E;
 978                         flctl->erase_ADRCNT = ADRCNT_3;
 979                 } else if (chip->chipsize > (8 << 16)) {
 980                         /* big than 512KB */
 981                         flctl->rw_ADRCNT = ADRCNT_4;
 982                         flctl->erase_ADRCNT = ADRCNT_2;
 983                 } else {
 984                         flctl->rw_ADRCNT = ADRCNT_3;
 985                         flctl->erase_ADRCNT = ADRCNT_1;
 986                 }
 987         }
 988
 989         if (flctl->hwecc) {
 990                 if (mtd->writesize == 512) {
 991                         chip->ecc.layout = &flctl_4secc_oob_16;
 992                         chip->badblock_pattern = &flctl_4secc_smallpage;
 993                 } else {
 994                         chip->ecc.layout = &flctl_4secc_oob_64;
 995                         chip->badblock_pattern = &flctl_4secc_largepage;
 996                 }
 997
 998                 chip->ecc.size = 512;
 999                 chip->ecc.bytes = 10;
1000                 chip->ecc.strength = 4;
1001                 chip->ecc.read_page = flctl_read_page_hwecc;
1002                 chip->ecc.write_page = flctl_write_page_hwecc;
1003                 chip->ecc.mode = NAND_ECC_HW;
1004
1005                 /* 4 symbols ECC enabled */
1006                 flctl->flcmncr_base |= _4ECCEN;
1007         } else {
1008                 chip->ecc.mode = NAND_ECC_SOFT;
1009         }
1010
1011         return 0;
1012 }
1013
1014 static irqreturn_t flctl_handle_flste(int irq, void *dev_id)
1015 {
1016         struct sh_flctl *flctl = dev_id;
1017
1018         dev_err(&flctl->pdev->dev, "flste irq: %x\n", readl(FLINTDMACR(flctl)));
1019         writel(flctl->flintdmacr_base, FLINTDMACR(flctl));
1020
1021         return IRQ_HANDLED;
1022 }
1023
1024 #ifdef CONFIG_OF
1025 struct flctl_soc_config {
1026         unsigned long flcmncr_val;
1027         unsigned has_hwecc:1;
1028         unsigned use_holden:1;
1029 };
1030
1031 static struct flctl_soc_config flctl_sh7372_config = {
1032         .flcmncr_val = CLK_16B_12L_4H | TYPESEL_SET | SHBUSSEL,
1033         .has_hwecc = 1,
1034         .use_holden = 1,
1035 };
1036
1037 static const struct of_device_id of_flctl_match[] = {
1038         { .compatible = "renesas,shmobile-flctl-sh7372",
1039                                 .data = &flctl_sh7372_config },
1040         {},
1041 };
1042 MODULE_DEVICE_TABLE(of, of_flctl_match);
1043
1044 static struct sh_flctl_platform_data *flctl_parse_dt(struct device *dev)
1045 {
1046         const struct of_device_id *match;
1047         struct flctl_soc_config *config;
1048         struct sh_flctl_platform_data *pdata;
1049         struct device_node *dn = dev->of_node;
1050         int ret;
1051
1052         match = of_match_device(of_flctl_match, dev);
1053         if (match)
1054                 config = (struct flctl_soc_config *)match->data;
1055         else {
1056                 dev_err(dev, "%s: no OF configuration attached\n", __func__);
1057                 return NULL;
1058         }
1059
1060         pdata = devm_kzalloc(dev, sizeof(struct sh_flctl_platform_data),
1061                                                                 GFP_KERNEL);
1062         if (!pdata) {
1063                 dev_err(dev, "%s: failed to allocate config data\n", __func__);
1064                 return NULL;
1065         }
1066
1067         /* set SoC specific options */
1068         pdata->flcmncr_val = config->flcmncr_val;
1069         pdata->has_hwecc = config->has_hwecc;
1070         pdata->use_holden = config->use_holden;
1071
1072         /* parse user defined options */
1073         ret = of_get_nand_bus_width(dn);
1074         if (ret == 16)
1075                 pdata->flcmncr_val |= SEL_16BIT;
1076         else if (ret != 8) {
1077                 dev_err(dev, "%s: invalid bus width\n", __func__);
1078                 return NULL;
1079         }
1080
1081         return pdata;
1082 }
1083 #else /* CONFIG_OF */
1084 #define of_flctl_match NULL
1085 static struct sh_flctl_platform_data *flctl_parse_dt(struct device *dev)
1086 {
1087         return NULL;
1088 }
1089 #endif /* CONFIG_OF */
1090
1091 static int flctl_probe(struct platform_device *pdev)
1092 {
1093         struct resource *res;
1094         struct sh_flctl *flctl;
1095         struct mtd_info *flctl_mtd;
1096         struct nand_chip *nand;
1097         struct sh_flctl_platform_data *pdata;
1098         int ret = -ENXIO;
1099         int irq;
1100         struct mtd_part_parser_data ppdata = {};
1101
1102         flctl = kzalloc(sizeof(struct sh_flctl), GFP_KERNEL);
1103         if (!flctl) {
1104                 dev_err(&pdev->dev, "failed to allocate driver data\n");
1105                 return -ENOMEM;
1106         }
1107
1108         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1109         if (!res) {
1110                 dev_err(&pdev->dev, "failed to get I/O memory\n");
1111                 goto err_iomap;
1112         }
1113
1114         flctl->reg = ioremap(res->start, resource_size(res));
1115         if (flctl->reg == NULL) {
1116                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
1117                 goto err_iomap;
1118         }
1119
1120         irq = platform_get_irq(pdev, 0);
1121         if (irq < 0) {
1122                 dev_err(&pdev->dev, "failed to get flste irq data\n");
1123                 goto err_flste;
1124         }
1125
1126         ret = request_irq(irq, flctl_handle_flste, IRQF_SHARED, "flste", flctl);
1127         if (ret) {
1128                 dev_err(&pdev->dev, "request interrupt failed.\n");
1129                 goto err_flste;
1130         }
1131
1132         if (pdev->dev.of_node)
1133                 pdata = flctl_parse_dt(&pdev->dev);
1134         else
1135                 pdata = pdev->dev.platform_data;
1136
1137         if (!pdata) {
1138                 dev_err(&pdev->dev, "no setup data defined\n");
1139                 ret = -EINVAL;
1140                 goto err_pdata;
1141         }
1142
1143         platform_set_drvdata(pdev, flctl);
1144         flctl_mtd = &flctl->mtd;
1145         nand = &flctl->chip;
1146         flctl_mtd->priv = nand;
1147         flctl->pdev = pdev;
1148         flctl->hwecc = pdata->has_hwecc;
1149         flctl->holden = pdata->use_holden;
1150         flctl->flcmncr_base = pdata->flcmncr_val;
1151         flctl->flintdmacr_base = flctl->hwecc ? (STERINTE | ECERB) : STERINTE;
1152
1153         /* Set address of hardware control function */
1154         /* 20 us command delay time */
1155         nand->chip_delay = 20;
1156
1157         nand->read_byte = flctl_read_byte;
1158         nand->write_buf = flctl_write_buf;
1159         nand->read_buf = flctl_read_buf;
1160         nand->select_chip = flctl_select_chip;
1161         nand->cmdfunc = flctl_cmdfunc;
1162
1163         if (pdata->flcmncr_val & SEL_16BIT) {
1164                 nand->options |= NAND_BUSWIDTH_16;
1165                 nand->read_word = flctl_read_word;
1166         }
1167
1168         pm_runtime_enable(&pdev->dev);
1169         pm_runtime_resume(&pdev->dev);
1170
1171         flctl_setup_dma(flctl);
1172
1173         ret = nand_scan_ident(flctl_mtd, 1, NULL);
1174         if (ret)
1175                 goto err_chip;
1176
1177         ret = flctl_chip_init_tail(flctl_mtd);
1178         if (ret)
1179                 goto err_chip;
1180
1181         ret = nand_scan_tail(flctl_mtd);
1182         if (ret)
1183                 goto err_chip;
1184
1185         ppdata.of_node = pdev->dev.of_node;
1186         ret = mtd_device_parse_register(flctl_mtd, NULL, &ppdata, pdata->parts,
1187                         pdata->nr_parts);
1188
1189         return 0;
1190
1191 err_chip:
1192         flctl_release_dma(flctl);
1193         pm_runtime_disable(&pdev->dev);
1194 err_pdata:
1195         free_irq(irq, flctl);
1196 err_flste:
1197         iounmap(flctl->reg);
1198 err_iomap:
1199         kfree(flctl);
1200         return ret;
1201 }
1202
1203 static int flctl_remove(struct platform_device *pdev)
1204 {
1205         struct sh_flctl *flctl = platform_get_drvdata(pdev);
1206
1207         flctl_release_dma(flctl);
1208         nand_release(&flctl->mtd);
1209         pm_runtime_disable(&pdev->dev);
1210         free_irq(platform_get_irq(pdev, 0), flctl);
1211         iounmap(flctl->reg);
1212         kfree(flctl);
1213
1214         return 0;
1215 }
1216
1217 static struct platform_driver flctl_driver = {
1218         .remove         = flctl_remove,
1219         .driver = {
1220                 .name   = "sh_flctl",
1221                 .owner  = THIS_MODULE,
1222                 .of_match_table = of_flctl_match,
1223         },
1224 };
1225
1226 static int __init flctl_nand_init(void)
1227 {
1228         return platform_driver_probe(&flctl_driver, flctl_probe);
1229 }
1230
1231 static void __exit flctl_nand_cleanup(void)
1232 {
1233         platform_driver_unregister(&flctl_driver);
1234 }
1235
1236 module_init(flctl_nand_init);
1237 module_exit(flctl_nand_cleanup);
1238
1239 MODULE_LICENSE("GPL");
1240 MODULE_AUTHOR("Yoshihiro Shimoda");
1241 MODULE_DESCRIPTION("SuperH FLCTL driver");
1242 MODULE_ALIAS("platform:sh_flctl");