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                             (mask & DWMCI_INTMSK_RXDR)) {
 125                                 while (size) {
 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                                         size = size > len ? (size - len) : 0;
 134                                 }
 135                                 dwmci_writel(host, DWMCI_RINTSTS,
 136                                              DWMCI_INTMSK_RXDR);
 137                         } else if (data->flags == MMC_DATA_WRITE &&
 138                                    (mask & DWMCI_INTMSK_TXDR)) {
 139                                 while (size) {
 140                                         len = dwmci_readl(host, DWMCI_STATUS);
 141                                         len = fifo_depth - ((len >>
 142                                                    DWMCI_FIFO_SHIFT) &
 143                                                    DWMCI_FIFO_MASK);
 144                                         len = min(size, len);
 145                                         for (i = 0; i < len; i++)
 146                                                 dwmci_writel(host, DWMCI_DATA,
 147                                                              *buf++);
 148                                         size = size > len ? (size - len) : 0;
 149                                 }
 150                                 dwmci_writel(host, DWMCI_RINTSTS,
 151                                              DWMCI_INTMSK_TXDR);
 152                         }
 153                 }
 154
 155                 /* Data arrived correctly. */
 156                 if (mask & DWMCI_INTMSK_DTO) {
 157                         ret = 0;
 158                         break;
 159                 }
 160
 161                 /* Check for timeout. */
 162                 if (get_timer(start) > timeout) {
 163                         debug("%s: Timeout waiting for data!\n",
 164                               __func__);
 165                         ret = -ETIMEDOUT;
 166                         break;
 167                 }
 168         }
 169
 170         dwmci_writel(host, DWMCI_RINTSTS, mask);
 171
 172         return ret;
 173 }
 174
 175 static int dwmci_set_transfer_mode(struct dwmci_host *host,
 176                 struct mmc_data *data)
 177 {
 178         unsigned long mode;
 179
 180         mode = DWMCI_CMD_DATA_EXP;
 181         if (data->flags & MMC_DATA_WRITE)
 182                 mode |= DWMCI_CMD_RW;
 183
 184         return mode;
 185 }
 186
 187 #ifdef CONFIG_DM_MMC
 188 static int dwmci_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 189                    struct mmc_data *data)
 190 {
 191         struct mmc *mmc = mmc_get_mmc_dev(dev);
 192 #else
 193 static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 194                 struct mmc_data *data)
 195 {
 196 #endif
 197         struct dwmci_host *host = mmc->priv;
 198         ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac,
 199                                  data ? DIV_ROUND_UP(data->blocks, 8) : 0);
 200         int ret = 0, flags = 0, i;
 201         unsigned int timeout = 500;
 202         u32 retry = 100000;
 203         u32 mask, ctrl;
 204         ulong start = get_timer(0);
 205         struct bounce_buffer bbstate;
 206
 207         while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
 208                 if (get_timer(start) > timeout) {
 209                         debug("%s: Timeout on data busy\n", __func__);
 210                         return -ETIMEDOUT;
 211                 }
 212         }
 213
 214         dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
 215
 216         if (data) {
 217                 if (host->fifo_mode) {
 218                         dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
 219                         dwmci_writel(host, DWMCI_BYTCNT,
 220                                      data->blocksize * data->blocks);
 221                         dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
 222                 } else {
 223                         if (data->flags == MMC_DATA_READ) {
 224                                 bounce_buffer_start(&bbstate, (void*)data->dest,
 225                                                 data->blocksize *
 226                                                 data->blocks, GEN_BB_WRITE);
 227                         } else {
 228                                 bounce_buffer_start(&bbstate, (void*)data->src,
 229                                                 data->blocksize *
 230                                                 data->blocks, GEN_BB_READ);
 231                         }
 232                         dwmci_prepare_data(host, data, cur_idmac,
 233                                            bbstate.bounce_buffer);
 234                 }
 235         }
 236
 237         dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
 238
 239         if (data)
 240                 flags = dwmci_set_transfer_mode(host, data);
 241
 242         if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
 243                 return -1;
 244
 245         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 246                 flags |= DWMCI_CMD_ABORT_STOP;
 247         else
 248                 flags |= DWMCI_CMD_PRV_DAT_WAIT;
 249
 250         if (cmd->resp_type & MMC_RSP_PRESENT) {
 251                 flags |= DWMCI_CMD_RESP_EXP;
 252                 if (cmd->resp_type & MMC_RSP_136)
 253                         flags |= DWMCI_CMD_RESP_LENGTH;
 254         }
 255
 256         if (cmd->resp_type & MMC_RSP_CRC)
 257                 flags |= DWMCI_CMD_CHECK_CRC;
 258
 259         flags |= (cmd->cmdidx | DWMCI_CMD_START | DWMCI_CMD_USE_HOLD_REG);
 260
 261         debug("Sending CMD%d\n",cmd->cmdidx);
 262
 263         dwmci_writel(host, DWMCI_CMD, flags);
 264
 265         for (i = 0; i < retry; i++) {
 266                 mask = dwmci_readl(host, DWMCI_RINTSTS);
 267                 if (mask & DWMCI_INTMSK_CDONE) {
 268                         if (!data)
 269                                 dwmci_writel(host, DWMCI_RINTSTS, mask);
 270                         break;
 271                 }
 272         }
 273
 274         if (i == retry) {
 275                 debug("%s: Timeout.\n", __func__);
 276                 return -ETIMEDOUT;
 277         }
 278
 279         if (mask & DWMCI_INTMSK_RTO) {
 280                 /*
 281                  * Timeout here is not necessarily fatal. (e)MMC cards
 282                  * will splat here when they receive CMD55 as they do
 283                  * not support this command and that is exactly the way
 284                  * to tell them apart from SD cards. Thus, this output
 285                  * below shall be debug(). eMMC cards also do not favor
 286                  * CMD8, please keep that in mind.
 287                  */
 288                 debug("%s: Response Timeout.\n", __func__);
 289                 return -ETIMEDOUT;
 290         } else if (mask & DWMCI_INTMSK_RE) {
 291                 debug("%s: Response Error.\n", __func__);
 292                 return -EIO;
 293         }
 294
 295
 296         if (cmd->resp_type & MMC_RSP_PRESENT) {
 297                 if (cmd->resp_type & MMC_RSP_136) {
 298                         cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
 299                         cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
 300                         cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
 301                         cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
 302                 } else {
 303                         cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
 304                 }
 305         }
 306
 307         if (data) {
 308                 ret = dwmci_data_transfer(host, data);
 309
 310                 /* only dma mode need it */
 311                 if (!host->fifo_mode) {
 312                         ctrl = dwmci_readl(host, DWMCI_CTRL);
 313                         ctrl &= ~(DWMCI_DMA_EN);
 314                         dwmci_writel(host, DWMCI_CTRL, ctrl);
 315                         bounce_buffer_stop(&bbstate);
 316                 }
 317         }
 318
 319         udelay(100);
 320
 321         return ret;
 322 }
 323
 324 static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
 325 {
 326         u32 div, status;
 327         int timeout = 10000;
 328         unsigned long sclk;
 329
 330         if ((freq == host->clock) || (freq == 0))
 331                 return 0;
 332         /*
 333          * If host->get_mmc_clk isn't defined,
 334          * then assume that host->bus_hz is source clock value.
 335          * host->bus_hz should be set by user.
 336          */
 337         if (host->get_mmc_clk)
 338                 sclk = host->get_mmc_clk(host, freq);
 339         else if (host->bus_hz)
 340                 sclk = host->bus_hz;
 341         else {
 342                 debug("%s: Didn't get source clock value.\n", __func__);
 343                 return -EINVAL;
 344         }
 345
 346         if (sclk == freq)
 347                 div = 0;        /* bypass mode */
 348         else
 349                 div = DIV_ROUND_UP(sclk, 2 * freq);
 350
 351         dwmci_writel(host, DWMCI_CLKENA, 0);
 352         dwmci_writel(host, DWMCI_CLKSRC, 0);
 353
 354         dwmci_writel(host, DWMCI_CLKDIV, div);
 355         dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 356                         DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
 357
 358         do {
 359                 status = dwmci_readl(host, DWMCI_CMD);
 360                 if (timeout-- < 0) {
 361                         debug("%s: Timeout!\n", __func__);
 362                         return -ETIMEDOUT;
 363                 }
 364         } while (status & DWMCI_CMD_START);
 365
 366         dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE |
 367                         DWMCI_CLKEN_LOW_PWR);
 368
 369         dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 370                         DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
 371
 372         timeout = 10000;
 373         do {
 374                 status = dwmci_readl(host, DWMCI_CMD);
 375                 if (timeout-- < 0) {
 376                         debug("%s: Timeout!\n", __func__);
 377                         return -ETIMEDOUT;
 378                 }
 379         } while (status & DWMCI_CMD_START);
 380
 381         host->clock = freq;
 382
 383         return 0;
 384 }
 385
 386 #ifdef CONFIG_DM_MMC
 387 static int dwmci_set_ios(struct udevice *dev)
 388 {
 389         struct mmc *mmc = mmc_get_mmc_dev(dev);
 390 #else
 391 static int dwmci_set_ios(struct mmc *mmc)
 392 {
 393 #endif
 394         struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
 395         u32 ctype, regs;
 396
 397         debug("Buswidth = %d, clock: %d\n", mmc->bus_width, mmc->clock);
 398
 399         dwmci_setup_bus(host, mmc->clock);
 400         switch (mmc->bus_width) {
 401         case 8:
 402                 ctype = DWMCI_CTYPE_8BIT;
 403                 break;
 404         case 4:
 405                 ctype = DWMCI_CTYPE_4BIT;
 406                 break;
 407         default:
 408                 ctype = DWMCI_CTYPE_1BIT;
 409                 break;
 410         }
 411
 412         dwmci_writel(host, DWMCI_CTYPE, ctype);
 413
 414         regs = dwmci_readl(host, DWMCI_UHS_REG);
 415         if (mmc->ddr_mode)
 416                 regs |= DWMCI_DDR_MODE;
 417         else
 418                 regs &= ~DWMCI_DDR_MODE;
 419
 420         dwmci_writel(host, DWMCI_UHS_REG, regs);
 421
 422         if (host->clksel)
 423                 host->clksel(host);
 424
 425         return 0;
 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
 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, struct dwmci_host *host,
 491                 u32 max_clk, u32 min_clk)
 492 {
 493         cfg->name = host->name;
 494 #ifndef CONFIG_DM_MMC
 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 = host->caps;
 503
 504         if (host->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, max_clk, min_clk);
 525
 526         host->mmc = mmc_create(&host->cfg, host);
 527         if (host->mmc == NULL)
 528                 return -1;
 529
 530         return 0;
 531 }
 532 #endif