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