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                         if (data->flags == MMC_DATA_READ) {
 123                                 if ((dwmci_readl(host, DWMCI_RINTSTS) &
 124                                      DWMCI_INTMSK_RXDR)) {
 125                                         len = dwmci_readl(host, DWMCI_STATUS);
 126                                         len = (len >> DWMCI_FIFO_SHIFT) &
 127                                                     DWMCI_FIFO_MASK;
 128                                         for (i = 0; i < len; i++)
 129                                                 *buf++ =
 130                                                 dwmci_readl(host, DWMCI_DATA);
 131                                         dwmci_writel(host, DWMCI_RINTSTS,
 132                                                      DWMCI_INTMSK_RXDR);
 133                                 }
 134                         } else {
 135                                 if ((dwmci_readl(host, DWMCI_RINTSTS) &
 136                                      DWMCI_INTMSK_TXDR)) {
 137                                         len = dwmci_readl(host, DWMCI_STATUS);
 138                                         len = fifo_depth - ((len >>
 139                                                    DWMCI_FIFO_SHIFT) &
 140                                                    DWMCI_FIFO_MASK);
 141                                         for (i = 0; i < len; i++)
 142                                                 dwmci_writel(host, DWMCI_DATA,
 143                                                              *buf++);
 144                                         dwmci_writel(host, DWMCI_RINTSTS,
 145                                                      DWMCI_INTMSK_TXDR);
 146                                 }
 147                         }
 148                         size = size > len ? (size - len) : 0;
 149                 }
 150
 151                 /* Data arrived correctly. */
 152                 if (mask & DWMCI_INTMSK_DTO) {
 153                         ret = 0;
 154                         break;
 155                 }
 156
 157                 /* Check for timeout. */
 158                 if (get_timer(start) > timeout) {
 159                         debug("%s: Timeout waiting for data!\n",
 160                               __func__);
 161                         ret = TIMEOUT;
 162                         break;
 163                 }
 164         }
 165
 166         dwmci_writel(host, DWMCI_RINTSTS, mask);
 167
 168         return ret;
 169 }
 170
 171 static int dwmci_set_transfer_mode(struct dwmci_host *host,
 172                 struct mmc_data *data)
 173 {
 174         unsigned long mode;
 175
 176         mode = DWMCI_CMD_DATA_EXP;
 177         if (data->flags & MMC_DATA_WRITE)
 178                 mode |= DWMCI_CMD_RW;
 179
 180         return mode;
 181 }
 182
 183 #ifdef CONFIG_DM_MMC_OPS
 184 static int dwmci_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 185                    struct mmc_data *data)
 186 {
 187         struct mmc *mmc = mmc_get_mmc_dev(dev);
 188 #else
 189 static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 190                 struct mmc_data *data)
 191 {
 192 #endif
 193         struct dwmci_host *host = mmc->priv;
 194         ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac,
 195                                  data ? DIV_ROUND_UP(data->blocks, 8) : 0);
 196         int ret = 0, flags = 0, i;
 197         unsigned int timeout = 500;
 198         u32 retry = 100000;
 199         u32 mask, ctrl;
 200         ulong start = get_timer(0);
 201         struct bounce_buffer bbstate;
 202
 203         while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
 204                 if (get_timer(start) > timeout) {
 205                         debug("%s: Timeout on data busy\n", __func__);
 206                         return TIMEOUT;
 207                 }
 208         }
 209
 210         dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
 211
 212         if (data) {
 213                 if (host->fifo_mode) {
 214                         dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
 215                         dwmci_writel(host, DWMCI_BYTCNT,
 216                                      data->blocksize * data->blocks);
 217                         dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
 218                 } else {
 219                         if (data->flags == MMC_DATA_READ) {
 220                                 bounce_buffer_start(&bbstate, (void*)data->dest,
 221                                                 data->blocksize *
 222                                                 data->blocks, GEN_BB_WRITE);
 223                         } else {
 224                                 bounce_buffer_start(&bbstate, (void*)data->src,
 225                                                 data->blocksize *
 226                                                 data->blocks, GEN_BB_READ);
 227                         }
 228                         dwmci_prepare_data(host, data, cur_idmac,
 229                                            bbstate.bounce_buffer);
 230                 }
 231         }
 232
 233         dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
 234
 235         if (data)
 236                 flags = dwmci_set_transfer_mode(host, data);
 237
 238         if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
 239                 return -1;
 240
 241         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 242                 flags |= DWMCI_CMD_ABORT_STOP;
 243         else
 244                 flags |= DWMCI_CMD_PRV_DAT_WAIT;
 245
 246         if (cmd->resp_type & MMC_RSP_PRESENT) {
 247                 flags |= DWMCI_CMD_RESP_EXP;
 248                 if (cmd->resp_type & MMC_RSP_136)
 249                         flags |= DWMCI_CMD_RESP_LENGTH;
 250         }
 251
 252         if (cmd->resp_type & MMC_RSP_CRC)
 253                 flags |= DWMCI_CMD_CHECK_CRC;
 254
 255         flags |= (cmd->cmdidx | DWMCI_CMD_START | DWMCI_CMD_USE_HOLD_REG);
 256
 257         debug("Sending CMD%d\n",cmd->cmdidx);
 258
 259         dwmci_writel(host, DWMCI_CMD, flags);
 260
 261         for (i = 0; i < retry; i++) {
 262                 mask = dwmci_readl(host, DWMCI_RINTSTS);
 263                 if (mask & DWMCI_INTMSK_CDONE) {
 264                         if (!data)
 265                                 dwmci_writel(host, DWMCI_RINTSTS, mask);
 266                         break;
 267                 }
 268         }
 269
 270         if (i == retry) {
 271                 debug("%s: Timeout.\n", __func__);
 272                 return TIMEOUT;
 273         }
 274
 275         if (mask & DWMCI_INTMSK_RTO) {
 276                 /*
 277                  * Timeout here is not necessarily fatal. (e)MMC cards
 278                  * will splat here when they receive CMD55 as they do
 279                  * not support this command and that is exactly the way
 280                  * to tell them apart from SD cards. Thus, this output
 281                  * below shall be debug(). eMMC cards also do not favor
 282                  * CMD8, please keep that in mind.
 283                  */
 284                 debug("%s: Response Timeout.\n", __func__);
 285                 return TIMEOUT;
 286         } else if (mask & DWMCI_INTMSK_RE) {
 287                 debug("%s: Response Error.\n", __func__);
 288                 return -EIO;
 289         }
 290
 291
 292         if (cmd->resp_type & MMC_RSP_PRESENT) {
 293                 if (cmd->resp_type & MMC_RSP_136) {
 294                         cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
 295                         cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
 296                         cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
 297                         cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
 298                 } else {
 299                         cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
 300                 }
 301         }
 302
 303         if (data) {
 304                 ret = dwmci_data_transfer(host, data);
 305
 306                 /* only dma mode need it */
 307                 if (!host->fifo_mode) {
 308                         ctrl = dwmci_readl(host, DWMCI_CTRL);
 309                         ctrl &= ~(DWMCI_DMA_EN);
 310                         dwmci_writel(host, DWMCI_CTRL, ctrl);
 311                         bounce_buffer_stop(&bbstate);
 312                 }
 313         }
 314
 315         udelay(100);
 316
 317         return ret;
 318 }
 319
 320 static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
 321 {
 322         u32 div, status;
 323         int timeout = 10000;
 324         unsigned long sclk;
 325
 326         if ((freq == host->clock) || (freq == 0))
 327                 return 0;
 328         /*
 329          * If host->get_mmc_clk isn't defined,
 330          * then assume that host->bus_hz is source clock value.
 331          * host->bus_hz should be set by user.
 332          */
 333         if (host->get_mmc_clk)
 334                 sclk = host->get_mmc_clk(host, freq);
 335         else if (host->bus_hz)
 336                 sclk = host->bus_hz;
 337         else {
 338                 debug("%s: Didn't get source clock value.\n", __func__);
 339                 return -EINVAL;
 340         }
 341
 342         if (sclk == freq)
 343                 div = 0;        /* bypass mode */
 344         else
 345                 div = DIV_ROUND_UP(sclk, 2 * freq);
 346
 347         dwmci_writel(host, DWMCI_CLKENA, 0);
 348         dwmci_writel(host, DWMCI_CLKSRC, 0);
 349
 350         dwmci_writel(host, DWMCI_CLKDIV, div);
 351         dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 352                         DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
 353
 354         do {
 355                 status = dwmci_readl(host, DWMCI_CMD);
 356                 if (timeout-- < 0) {
 357                         debug("%s: Timeout!\n", __func__);
 358                         return -ETIMEDOUT;
 359                 }
 360         } while (status & DWMCI_CMD_START);
 361
 362         dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE |
 363                         DWMCI_CLKEN_LOW_PWR);
 364
 365         dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 366                         DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
 367
 368         timeout = 10000;
 369         do {
 370                 status = dwmci_readl(host, DWMCI_CMD);
 371                 if (timeout-- < 0) {
 372                         debug("%s: Timeout!\n", __func__);
 373                         return -ETIMEDOUT;
 374                 }
 375         } while (status & DWMCI_CMD_START);
 376
 377         host->clock = freq;
 378
 379         return 0;
 380 }
 381
 382 #ifdef CONFIG_DM_MMC_OPS
 383 static int dwmci_set_ios(struct udevice *dev)
 384 {
 385         struct mmc *mmc = mmc_get_mmc_dev(dev);
 386 #else
 387 static void dwmci_set_ios(struct mmc *mmc)
 388 {
 389 #endif
 390         struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
 391         u32 ctype, regs;
 392
 393         debug("Buswidth = %d, clock: %d\n", mmc->bus_width, mmc->clock);
 394
 395         dwmci_setup_bus(host, mmc->clock);
 396         switch (mmc->bus_width) {
 397         case 8:
 398                 ctype = DWMCI_CTYPE_8BIT;
 399                 break;
 400         case 4:
 401                 ctype = DWMCI_CTYPE_4BIT;
 402                 break;
 403         default:
 404                 ctype = DWMCI_CTYPE_1BIT;
 405                 break;
 406         }
 407
 408         dwmci_writel(host, DWMCI_CTYPE, ctype);
 409
 410         regs = dwmci_readl(host, DWMCI_UHS_REG);
 411         if (mmc->ddr_mode)
 412                 regs |= DWMCI_DDR_MODE;
 413         else
 414                 regs &= ~DWMCI_DDR_MODE;
 415
 416         dwmci_writel(host, DWMCI_UHS_REG, regs);
 417
 418         if (host->clksel)
 419                 host->clksel(host);
 420 #ifdef CONFIG_DM_MMC_OPS
 421         return 0;
 422 #endif
 423 }
 424
 425 static int dwmci_init(struct mmc *mmc)
 426 {
 427         struct dwmci_host *host = mmc->priv;
 428
 429         if (host->board_init)
 430                 host->board_init(host);
 431
 432         dwmci_writel(host, DWMCI_PWREN, 1);
 433
 434         if (!dwmci_wait_reset(host, DWMCI_RESET_ALL)) {
 435                 debug("%s[%d] Fail-reset!!\n", __func__, __LINE__);
 436                 return -EIO;
 437         }
 438
 439         /* Enumerate at 400KHz */
 440         dwmci_setup_bus(host, mmc->cfg->f_min);
 441
 442         dwmci_writel(host, DWMCI_RINTSTS, 0xFFFFFFFF);
 443         dwmci_writel(host, DWMCI_INTMASK, 0);
 444
 445         dwmci_writel(host, DWMCI_TMOUT, 0xFFFFFFFF);
 446
 447         dwmci_writel(host, DWMCI_IDINTEN, 0);
 448         dwmci_writel(host, DWMCI_BMOD, 1);
 449
 450         if (!host->fifoth_val) {
 451                 uint32_t fifo_size;
 452
 453                 fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
 454                 fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
 455                 host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
 456                                 TX_WMARK(fifo_size / 2);
 457         }
 458         dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
 459
 460         dwmci_writel(host, DWMCI_CLKENA, 0);
 461         dwmci_writel(host, DWMCI_CLKSRC, 0);
 462
 463         return 0;
 464 }
 465
 466 #ifdef CONFIG_DM_MMC_OPS
 467 int dwmci_probe(struct udevice *dev)
 468 {
 469         struct mmc *mmc = mmc_get_mmc_dev(dev);
 470
 471         return dwmci_init(mmc);
 472 }
 473
 474 const struct dm_mmc_ops dm_dwmci_ops = {
 475         .send_cmd       = dwmci_send_cmd,
 476         .set_ios        = dwmci_set_ios,
 477 };
 478
 479 #else
 480 static const struct mmc_ops dwmci_ops = {
 481         .send_cmd       = dwmci_send_cmd,
 482         .set_ios        = dwmci_set_ios,
 483         .init           = dwmci_init,
 484 };
 485 #endif
 486
 487 void dwmci_setup_cfg(struct mmc_config *cfg, const char *name, int buswidth,
 488                      uint caps, u32 max_clk, u32 min_clk)
 489 {
 490         cfg->name = name;
 491 #ifndef CONFIG_DM_MMC_OPS
 492         cfg->ops = &dwmci_ops;
 493 #endif
 494         cfg->f_min = min_clk;
 495         cfg->f_max = max_clk;
 496
 497         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 498
 499         cfg->host_caps = caps;
 500
 501         if (buswidth == 8) {
 502                 cfg->host_caps |= MMC_MODE_8BIT;
 503                 cfg->host_caps &= ~MMC_MODE_4BIT;
 504         } else {
 505                 cfg->host_caps |= MMC_MODE_4BIT;
 506                 cfg->host_caps &= ~MMC_MODE_8BIT;
 507         }
 508         cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
 509
 510         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 511 }
 512
 513 #ifdef CONFIG_BLK
 514 int dwmci_bind(struct udevice *dev, struct mmc *mmc, struct mmc_config *cfg)
 515 {
 516         return mmc_bind(dev, mmc, cfg);
 517 }
 518 #else
 519 int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk)
 520 {
 521         dwmci_setup_cfg(&host->cfg, host->name, host->buswidth, host->caps,
 522                         max_clk, min_clk);
 523
 524         host->mmc = mmc_create(&host->cfg, host);
 525         if (host->mmc == NULL)
 526                 return -1;
 527
 528         return 0;
 529 }
 530 #endif