drivers/mmc/dw_mmc.c

   1 /*
   2  * (C) Copyright 2012 SAMSUNG Electronics
   3  * Jaehoon Chung <jh80.chung@samsung.com>
   4  * Rajeshawari Shinde <rajeshwari.s@samsung.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <bouncebuf.h>
  10 #include <common.h>
  11 #include <errno.h>
  12 #include <malloc.h>
  13 #include <memalign.h>
  14 #include <mmc.h>
  15 #include <dwmmc.h>
  16
  17 #define PAGE_SIZE 4096
  18
  19 static int dwmci_wait_reset(struct dwmci_host *host, u32 value)
  20 {
  21         unsigned long timeout = 1000;
  22         u32 ctrl;
  23
  24         dwmci_writel(host, DWMCI_CTRL, value);
  25
  26         while (timeout--) {
  27                 ctrl = dwmci_readl(host, DWMCI_CTRL);
  28                 if (!(ctrl & DWMCI_RESET_ALL))
  29                         return 1;
  30         }
  31         return 0;
  32 }
  33
  34 static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
  35                 u32 desc0, u32 desc1, u32 desc2)
  36 {
  37         struct dwmci_idmac *desc = idmac;
  38
  39         desc->flags = desc0;
  40         desc->cnt = desc1;
  41         desc->addr = desc2;
  42         desc->next_addr = (ulong)desc + sizeof(struct dwmci_idmac);
  43 }
  44
  45 static void dwmci_prepare_data(struct dwmci_host *host,
  46                                struct mmc_data *data,
  47                                struct dwmci_idmac *cur_idmac,
  48                                void *bounce_buffer)
  49 {
  50         unsigned long ctrl;
  51         unsigned int i = 0, flags, cnt, blk_cnt;
  52         ulong data_start, data_end;
  53
  54
  55         blk_cnt = data->blocks;
  56
  57         dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
  58
  59         data_start = (ulong)cur_idmac;
  60         dwmci_writel(host, DWMCI_DBADDR, (ulong)cur_idmac);
  61
  62         do {
  63                 flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH ;
  64                 flags |= (i == 0) ? DWMCI_IDMAC_FS : 0;
  65                 if (blk_cnt <= 8) {
  66                         flags |= DWMCI_IDMAC_LD;
  67                         cnt = data->blocksize * blk_cnt;
  68                 } else
  69                         cnt = data->blocksize * 8;
  70
  71                 dwmci_set_idma_desc(cur_idmac, flags, cnt,
  72                                     (ulong)bounce_buffer + (i * PAGE_SIZE));
  73
  74                 if (blk_cnt <= 8)
  75                         break;
  76                 blk_cnt -= 8;
  77                 cur_idmac++;
  78                 i++;
  79         } while(1);
  80
  81         data_end = (ulong)cur_idmac;
  82         flush_dcache_range(data_start, data_end + ARCH_DMA_MINALIGN);
  83
  84         ctrl = dwmci_readl(host, DWMCI_CTRL);
  85         ctrl |= DWMCI_IDMAC_EN | DWMCI_DMA_EN;
  86         dwmci_writel(host, DWMCI_CTRL, ctrl);
  87
  88         ctrl = dwmci_readl(host, DWMCI_BMOD);
  89         ctrl |= DWMCI_BMOD_IDMAC_FB | DWMCI_BMOD_IDMAC_EN;
  90         dwmci_writel(host, DWMCI_BMOD, ctrl);
  91
  92         dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
  93         dwmci_writel(host, DWMCI_BYTCNT, data->blocksize * data->blocks);
  94 }
  95
  96 static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
  97 {
  98         int ret = 0;
  99         u32 timeout = 240000;
 100         u32 mask, size, i, len = 0;
 101         u32 *buf = NULL;
 102         ulong start = get_timer(0);
 103         u32 fifo_depth = (((host->fifoth_val & RX_WMARK_MASK) >>
 104                             RX_WMARK_SHIFT) + 1) * 2;
 105
 106         size = data->blocksize * data->blocks / 4;
 107         if (data->flags == MMC_DATA_READ)
 108                 buf = (unsigned int *)data->dest;
 109         else
 110                 buf = (unsigned int *)data->src;
 111
 112         for (;;) {
 113                 mask = dwmci_readl(host, DWMCI_RINTSTS);
 114                 /* Error during data transfer. */
 115                 if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
 116                         debug("%s: DATA ERROR!\n", __func__);
 117                         ret = -EINVAL;
 118                         break;
 119                 }
 120
 121                 if (host->fifo_mode && size) {
 122                         len = 0;
 123                         if (data->flags == MMC_DATA_READ) {
 124                                 if ((dwmci_readl(host, DWMCI_RINTSTS) &
 125                                      DWMCI_INTMSK_RXDR)) {
 126                                         len = dwmci_readl(host, DWMCI_STATUS);
 127                                         len = (len >> DWMCI_FIFO_SHIFT) &
 128                                                     DWMCI_FIFO_MASK;
 129                                         len = min(size, len);
 130                                         for (i = 0; i < len; i++)
 131                                                 *buf++ =
 132                                                 dwmci_readl(host, DWMCI_DATA);
 133                                         dwmci_writel(host, DWMCI_RINTSTS,
 134                                                      DWMCI_INTMSK_RXDR);
 135                                 }
 136                         } else {
 137                                 if ((dwmci_readl(host, DWMCI_RINTSTS) &
 138                                      DWMCI_INTMSK_TXDR)) {
 139                                         len = dwmci_readl(host, DWMCI_STATUS);
 140                                         len = fifo_depth - ((len >>
 141                                                    DWMCI_FIFO_SHIFT) &
 142                                                    DWMCI_FIFO_MASK);
 143                                         len = min(size, len);
 144                                         for (i = 0; i < len; i++)
 145                                                 dwmci_writel(host, DWMCI_DATA,
 146                                                              *buf++);
 147                                         dwmci_writel(host, DWMCI_RINTSTS,
 148                                                      DWMCI_INTMSK_TXDR);
 149                                 }
 150                         }
 151                         size = size > len ? (size - len) : 0;
 152                 }
 153
 154                 /* Data arrived correctly. */
 155                 if (mask & DWMCI_INTMSK_DTO) {
 156                         ret = 0;
 157                         break;
 158                 }
 159
 160                 /* Check for timeout. */
 161                 if (get_timer(start) > timeout) {
 162                         debug("%s: Timeout waiting for data!\n",
 163                               __func__);
 164                         ret = -ETIMEDOUT;
 165                         break;
 166                 }
 167         }
 168
 169         dwmci_writel(host, DWMCI_RINTSTS, mask);
 170
 171         return ret;
 172 }
 173
 174 static int dwmci_set_transfer_mode(struct dwmci_host *host,
 175                 struct mmc_data *data)
 176 {
 177         unsigned long mode;
 178
 179         mode = DWMCI_CMD_DATA_EXP;
 180         if (data->flags & MMC_DATA_WRITE)
 181                 mode |= DWMCI_CMD_RW;
 182
 183         return mode;
 184 }
 185
 186 #ifdef CONFIG_DM_MMC_OPS
 187 static int dwmci_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 188                    struct mmc_data *data)
 189 {
 190         struct mmc *mmc = mmc_get_mmc_dev(dev);
 191 #else
 192 static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 193                 struct mmc_data *data)
 194 {
 195 #endif
 196         struct dwmci_host *host = mmc->priv;
 197         ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac,
 198                                  data ? DIV_ROUND_UP(data->blocks, 8) : 0);
 199         int ret = 0, flags = 0, i;
 200         unsigned int timeout = 500;
 201         u32 retry = 100000;
 202         u32 mask, ctrl;
 203         ulong start = get_timer(0);
 204         struct bounce_buffer bbstate;
 205
 206         while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
 207                 if (get_timer(start) > timeout) {
 208                         debug("%s: Timeout on data busy\n", __func__);
 209                         return -ETIMEDOUT;
 210                 }
 211         }
 212
 213         dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
 214
 215         if (data) {
 216                 if (host->fifo_mode) {
 217                         dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
 218                         dwmci_writel(host, DWMCI_BYTCNT,
 219                                      data->blocksize * data->blocks);
 220                         dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
 221                 } else {
 222                         if (data->flags == MMC_DATA_READ) {
 223                                 bounce_buffer_start(&bbstate, (void*)data->dest,
 224                                                 data->blocksize *
 225                                                 data->blocks, GEN_BB_WRITE);
 226                         } else {
 227                                 bounce_buffer_start(&bbstate, (void*)data->src,
 228                                                 data->blocksize *
 229                                                 data->blocks, GEN_BB_READ);
 230                         }
 231                         dwmci_prepare_data(host, data, cur_idmac,
 232                                            bbstate.bounce_buffer);
 233                 }
 234         }
 235
 236         dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
 237
 238         if (data)
 239                 flags = dwmci_set_transfer_mode(host, data);
 240
 241         if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
 242                 return -1;
 243
 244         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 245                 flags |= DWMCI_CMD_ABORT_STOP;
 246         else
 247                 flags |= DWMCI_CMD_PRV_DAT_WAIT;
 248
 249         if (cmd->resp_type & MMC_RSP_PRESENT) {
 250                 flags |= DWMCI_CMD_RESP_EXP;
 251                 if (cmd->resp_type & MMC_RSP_136)
 252                         flags |= DWMCI_CMD_RESP_LENGTH;
 253         }
 254
 255         if (cmd->resp_type & MMC_RSP_CRC)
 256                 flags |= DWMCI_CMD_CHECK_CRC;
 257
 258         flags |= (cmd->cmdidx | DWMCI_CMD_START | DWMCI_CMD_USE_HOLD_REG);
 259
 260         debug("Sending CMD%d\n",cmd->cmdidx);
 261
 262         dwmci_writel(host, DWMCI_CMD, flags);
 263
 264         for (i = 0; i < retry; i++) {
 265                 mask = dwmci_readl(host, DWMCI_RINTSTS);
 266                 if (mask & DWMCI_INTMSK_CDONE) {
 267                         if (!data)
 268                                 dwmci_writel(host, DWMCI_RINTSTS, mask);
 269                         break;
 270                 }
 271         }
 272
 273         if (i == retry) {
 274                 debug("%s: Timeout.\n", __func__);
 275                 return -ETIMEDOUT;
 276         }
 277
 278         if (mask & DWMCI_INTMSK_RTO) {
 279                 /*
 280                  * Timeout here is not necessarily fatal. (e)MMC cards
 281                  * will splat here when they receive CMD55 as they do
 282                  * not support this command and that is exactly the way
 283                  * to tell them apart from SD cards. Thus, this output
 284                  * below shall be debug(). eMMC cards also do not favor
 285                  * CMD8, please keep that in mind.
 286                  */
 287                 debug("%s: Response Timeout.\n", __func__);
 288                 return -ETIMEDOUT;
 289         } else if (mask & DWMCI_INTMSK_RE) {
 290                 debug("%s: Response Error.\n", __func__);
 291                 return -EIO;
 292         }
 293
 294
 295         if (cmd->resp_type & MMC_RSP_PRESENT) {
 296                 if (cmd->resp_type & MMC_RSP_136) {
 297                         cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
 298                         cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
 299                         cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
 300                         cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
 301                 } else {
 302                         cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
 303                 }
 304         }
 305
 306         if (data) {
 307                 ret = dwmci_data_transfer(host, data);
 308
 309                 /* only dma mode need it */
 310                 if (!host->fifo_mode) {
 311                         ctrl = dwmci_readl(host, DWMCI_CTRL);
 312                         ctrl &= ~(DWMCI_DMA_EN);
 313                         dwmci_writel(host, DWMCI_CTRL, ctrl);
 314                         bounce_buffer_stop(&bbstate);
 315                 }
 316         }
 317
 318         udelay(100);
 319
 320         return ret;
 321 }
 322
 323 static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
 324 {
 325         u32 div, status;
 326         int timeout = 10000;
 327         unsigned long sclk;
 328
 329         if ((freq == host->clock) || (freq == 0))
 330                 return 0;
 331         /*
 332          * If host->get_mmc_clk isn't defined,
 333          * then assume that host->bus_hz is source clock value.
 334          * host->bus_hz should be set by user.
 335          */
 336         if (host->get_mmc_clk)
 337                 sclk = host->get_mmc_clk(host, freq);
 338         else if (host->bus_hz)
 339                 sclk = host->bus_hz;
 340         else {
 341                 debug("%s: Didn't get source clock value.\n", __func__);
 342                 return -EINVAL;
 343         }
 344
 345         if (sclk == freq)
 346                 div = 0;        /* bypass mode */
 347         else
 348                 div = DIV_ROUND_UP(sclk, 2 * freq);
 349
 350         dwmci_writel(host, DWMCI_CLKENA, 0);
 351         dwmci_writel(host, DWMCI_CLKSRC, 0);
 352
 353         dwmci_writel(host, DWMCI_CLKDIV, div);
 354         dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 355                         DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
 356
 357         do {
 358                 status = dwmci_readl(host, DWMCI_CMD);
 359                 if (timeout-- < 0) {
 360                         debug("%s: Timeout!\n", __func__);
 361                         return -ETIMEDOUT;
 362                 }
 363         } while (status & DWMCI_CMD_START);
 364
 365         dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE |
 366                         DWMCI_CLKEN_LOW_PWR);
 367
 368         dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 369                         DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
 370
 371         timeout = 10000;
 372         do {
 373                 status = dwmci_readl(host, DWMCI_CMD);
 374                 if (timeout-- < 0) {
 375                         debug("%s: Timeout!\n", __func__);
 376                         return -ETIMEDOUT;
 377                 }
 378         } while (status & DWMCI_CMD_START);
 379
 380         host->clock = freq;
 381
 382         return 0;
 383 }
 384
 385 #ifdef CONFIG_DM_MMC_OPS
 386 static int dwmci_set_ios(struct udevice *dev)
 387 {
 388         struct mmc *mmc = mmc_get_mmc_dev(dev);
 389 #else
 390 static void dwmci_set_ios(struct mmc *mmc)
 391 {
 392 #endif
 393         struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
 394         u32 ctype, regs;
 395
 396         debug("Buswidth = %d, clock: %d\n", mmc->bus_width, mmc->clock);
 397
 398         dwmci_setup_bus(host, mmc->clock);
 399         switch (mmc->bus_width) {
 400         case 8:
 401                 ctype = DWMCI_CTYPE_8BIT;
 402                 break;
 403         case 4:
 404                 ctype = DWMCI_CTYPE_4BIT;
 405                 break;
 406         default:
 407                 ctype = DWMCI_CTYPE_1BIT;
 408                 break;
 409         }
 410
 411         dwmci_writel(host, DWMCI_CTYPE, ctype);
 412
 413         regs = dwmci_readl(host, DWMCI_UHS_REG);
 414         if (mmc->ddr_mode)
 415                 regs |= DWMCI_DDR_MODE;
 416         else
 417                 regs &= ~DWMCI_DDR_MODE;
 418
 419         dwmci_writel(host, DWMCI_UHS_REG, regs);
 420
 421         if (host->clksel)
 422                 host->clksel(host);
 423 #ifdef CONFIG_DM_MMC_OPS
 424         return 0;
 425 #endif
 426 }
 427
 428 static int dwmci_init(struct mmc *mmc)
 429 {
 430         struct dwmci_host *host = mmc->priv;
 431
 432         if (host->board_init)
 433                 host->board_init(host);
 434
 435         dwmci_writel(host, DWMCI_PWREN, 1);
 436
 437         if (!dwmci_wait_reset(host, DWMCI_RESET_ALL)) {
 438                 debug("%s[%d] Fail-reset!!\n", __func__, __LINE__);
 439                 return -EIO;
 440         }
 441
 442         /* Enumerate at 400KHz */
 443         dwmci_setup_bus(host, mmc->cfg->f_min);
 444
 445         dwmci_writel(host, DWMCI_RINTSTS, 0xFFFFFFFF);
 446         dwmci_writel(host, DWMCI_INTMASK, 0);
 447
 448         dwmci_writel(host, DWMCI_TMOUT, 0xFFFFFFFF);
 449
 450         dwmci_writel(host, DWMCI_IDINTEN, 0);
 451         dwmci_writel(host, DWMCI_BMOD, 1);
 452
 453         if (!host->fifoth_val) {
 454                 uint32_t fifo_size;
 455
 456                 fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
 457                 fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
 458                 host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
 459                                 TX_WMARK(fifo_size / 2);
 460         }
 461         dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
 462
 463         dwmci_writel(host, DWMCI_CLKENA, 0);
 464         dwmci_writel(host, DWMCI_CLKSRC, 0);
 465
 466         return 0;
 467 }
 468
 469 #ifdef CONFIG_DM_MMC_OPS
 470 int dwmci_probe(struct udevice *dev)
 471 {
 472         struct mmc *mmc = mmc_get_mmc_dev(dev);
 473
 474         return dwmci_init(mmc);
 475 }
 476
 477 const struct dm_mmc_ops dm_dwmci_ops = {
 478         .send_cmd       = dwmci_send_cmd,
 479         .set_ios        = dwmci_set_ios,
 480 };
 481
 482 #else
 483 static const struct mmc_ops dwmci_ops = {
 484         .send_cmd       = dwmci_send_cmd,
 485         .set_ios        = dwmci_set_ios,
 486         .init           = dwmci_init,
 487 };
 488 #endif
 489
 490 void dwmci_setup_cfg(struct mmc_config *cfg, const char *name, int buswidth,
 491                      uint caps, u32 max_clk, u32 min_clk)
 492 {
 493         cfg->name = name;
 494 #ifndef CONFIG_DM_MMC_OPS
 495         cfg->ops = &dwmci_ops;
 496 #endif
 497         cfg->f_min = min_clk;
 498         cfg->f_max = max_clk;
 499
 500         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 501
 502         cfg->host_caps = caps;
 503
 504         if (buswidth == 8) {
 505                 cfg->host_caps |= MMC_MODE_8BIT;
 506                 cfg->host_caps &= ~MMC_MODE_4BIT;
 507         } else {
 508                 cfg->host_caps |= MMC_MODE_4BIT;
 509                 cfg->host_caps &= ~MMC_MODE_8BIT;
 510         }
 511         cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
 512
 513         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 514 }
 515
 516 #ifdef CONFIG_BLK
 517 int dwmci_bind(struct udevice *dev, struct mmc *mmc, struct mmc_config *cfg)
 518 {
 519         return mmc_bind(dev, mmc, cfg);
 520 }
 521 #else
 522 int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk)
 523 {
 524         dwmci_setup_cfg(&host->cfg, host->name, host->buswidth, host->caps,
 525                         max_clk, min_clk);
 526
 527         host->mmc = mmc_create(&host->cfg, host);
 528         if (host->mmc == NULL)
 529                 return -1;
 530
 531         return 0;
 532 }
 533 #endif