drivers/mmc/sdhci.c

   1 /*
   2  * Copyright 2011, Marvell Semiconductor Inc.
   3  * Lei Wen <leiwen@marvell.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Back ported to the 8xx platform (from the 8260 platform) by
   8  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
   9  */
  10
  11 #include <common.h>
  12 #include <malloc.h>
  13 #include <mmc.h>
  14 #include <sdhci.h>
  15
  16 void *aligned_buffer;
  17
  18 static void sdhci_reset(struct sdhci_host *host, u8 mask)
  19 {
  20         unsigned long timeout;
  21
  22         /* Wait max 100 ms */
  23         timeout = 100;
  24         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
  25         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
  26                 if (timeout == 0) {
  27                         printf("%s: Reset 0x%x never completed.\n",
  28                                __func__, (int)mask);
  29                         return;
  30                 }
  31                 timeout--;
  32                 udelay(1000);
  33         }
  34 }
  35
  36 static void sdhci_cmd_done(struct sdhci_host *host, struct mmc_cmd *cmd)
  37 {
  38         int i;
  39         if (cmd->resp_type & MMC_RSP_136) {
  40                 /* CRC is stripped so we need to do some shifting. */
  41                 for (i = 0; i < 4; i++) {
  42                         cmd->response[i] = sdhci_readl(host,
  43                                         SDHCI_RESPONSE + (3-i)*4) << 8;
  44                         if (i != 3)
  45                                 cmd->response[i] |= sdhci_readb(host,
  46                                                 SDHCI_RESPONSE + (3-i)*4-1);
  47                 }
  48         } else {
  49                 cmd->response[0] = sdhci_readl(host, SDHCI_RESPONSE);
  50         }
  51 }
  52
  53 static void sdhci_transfer_pio(struct sdhci_host *host, struct mmc_data *data)
  54 {
  55         int i;
  56         char *offs;
  57         for (i = 0; i < data->blocksize; i += 4) {
  58                 offs = data->dest + i;
  59                 if (data->flags == MMC_DATA_READ)
  60                         *(u32 *)offs = sdhci_readl(host, SDHCI_BUFFER);
  61                 else
  62                         sdhci_writel(host, *(u32 *)offs, SDHCI_BUFFER);
  63         }
  64 }
  65
  66 static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
  67                                 unsigned int start_addr)
  68 {
  69         unsigned int stat, rdy, mask, timeout, block = 0;
  70 #ifdef CONFIG_MMC_SDMA
  71         unsigned char ctrl;
  72         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
  73         ctrl &= ~SDHCI_CTRL_DMA_MASK;
  74         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
  75 #endif
  76
  77         timeout = 1000000;
  78         rdy = SDHCI_INT_SPACE_AVAIL | SDHCI_INT_DATA_AVAIL;
  79         mask = SDHCI_DATA_AVAILABLE | SDHCI_SPACE_AVAILABLE;
  80         do {
  81                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
  82                 if (stat & SDHCI_INT_ERROR) {
  83                         printf("%s: Error detected in status(0x%X)!\n",
  84                                __func__, stat);
  85                         return -1;
  86                 }
  87                 if (stat & rdy) {
  88                         if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & mask))
  89                                 continue;
  90                         sdhci_writel(host, rdy, SDHCI_INT_STATUS);
  91                         sdhci_transfer_pio(host, data);
  92                         data->dest += data->blocksize;
  93                         if (++block >= data->blocks)
  94                                 break;
  95                 }
  96 #ifdef CONFIG_MMC_SDMA
  97                 if (stat & SDHCI_INT_DMA_END) {
  98                         sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
  99                         start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
 100                         start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
 101                         sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 102                 }
 103 #endif
 104                 if (timeout-- > 0)
 105                         udelay(10);
 106                 else {
 107                         printf("%s: Transfer data timeout\n", __func__);
 108                         return -1;
 109                 }
 110         } while (!(stat & SDHCI_INT_DATA_END));
 111         return 0;
 112 }
 113
 114 /*
 115  * No command will be sent by driver if card is busy, so driver must wait
 116  * for card ready state.
 117  * Every time when card is busy after timeout then (last) timeout value will be
 118  * increased twice but only if it doesn't exceed global defined maximum.
 119  * Each function call will use last timeout value. Max timeout can be redefined
 120  * in board config file.
 121  */
 122 #ifndef CONFIG_SDHCI_CMD_MAX_TIMEOUT
 123 #define CONFIG_SDHCI_CMD_MAX_TIMEOUT            3200
 124 #endif
 125 #define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT        100
 126
 127 int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 128                        struct mmc_data *data)
 129 {
 130         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 131         unsigned int stat = 0;
 132         int ret = 0;
 133         int trans_bytes = 0, is_aligned = 1;
 134         u32 mask, flags, mode;
 135         unsigned int time = 0, start_addr = 0;
 136         unsigned int retry = 10000;
 137         int mmc_dev = mmc->block_dev.dev;
 138
 139         /* Timeout unit - ms */
 140         static unsigned int cmd_timeout = CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT;
 141
 142         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 143         mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;
 144
 145         /* We shouldn't wait for data inihibit for stop commands, even
 146            though they might use busy signaling */
 147         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 148                 mask &= ~SDHCI_DATA_INHIBIT;
 149
 150         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 151                 if (time >= cmd_timeout) {
 152                         printf("%s: MMC: %d busy ", __func__, mmc_dev);
 153                         if (2 * cmd_timeout <= CONFIG_SDHCI_CMD_MAX_TIMEOUT) {
 154                                 cmd_timeout += cmd_timeout;
 155                                 printf("timeout increasing to: %u ms.\n",
 156                                        cmd_timeout);
 157                         } else {
 158                                 puts("timeout.\n");
 159                                 return COMM_ERR;
 160                         }
 161                 }
 162                 time++;
 163                 udelay(1000);
 164         }
 165
 166         mask = SDHCI_INT_RESPONSE;
 167         if (!(cmd->resp_type & MMC_RSP_PRESENT))
 168                 flags = SDHCI_CMD_RESP_NONE;
 169         else if (cmd->resp_type & MMC_RSP_136)
 170                 flags = SDHCI_CMD_RESP_LONG;
 171         else if (cmd->resp_type & MMC_RSP_BUSY) {
 172                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 173                 mask |= SDHCI_INT_DATA_END;
 174         } else
 175                 flags = SDHCI_CMD_RESP_SHORT;
 176
 177         if (cmd->resp_type & MMC_RSP_CRC)
 178                 flags |= SDHCI_CMD_CRC;
 179         if (cmd->resp_type & MMC_RSP_OPCODE)
 180                 flags |= SDHCI_CMD_INDEX;
 181         if (data)
 182                 flags |= SDHCI_CMD_DATA;
 183
 184         /* Set Transfer mode regarding to data flag */
 185         if (data != 0) {
 186                 sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
 187                 mode = SDHCI_TRNS_BLK_CNT_EN;
 188                 trans_bytes = data->blocks * data->blocksize;
 189                 if (data->blocks > 1)
 190                         mode |= SDHCI_TRNS_MULTI;
 191
 192                 if (data->flags == MMC_DATA_READ)
 193                         mode |= SDHCI_TRNS_READ;
 194
 195 #ifdef CONFIG_MMC_SDMA
 196                 if (data->flags == MMC_DATA_READ)
 197                         start_addr = (unsigned int)data->dest;
 198                 else
 199                         start_addr = (unsigned int)data->src;
 200                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 201                                 (start_addr & 0x7) != 0x0) {
 202                         is_aligned = 0;
 203                         start_addr = (unsigned int)aligned_buffer;
 204                         if (data->flags != MMC_DATA_READ)
 205                                 memcpy(aligned_buffer, data->src, trans_bytes);
 206                 }
 207
 208                 sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 209                 mode |= SDHCI_TRNS_DMA;
 210 #endif
 211                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 212                                 data->blocksize),
 213                                 SDHCI_BLOCK_SIZE);
 214                 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 215                 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 216         }
 217
 218         sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
 219 #ifdef CONFIG_MMC_SDMA
 220         flush_cache(start_addr, trans_bytes);
 221 #endif
 222         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
 223         do {
 224                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
 225                 if (stat & SDHCI_INT_ERROR)
 226                         break;
 227                 if (--retry == 0)
 228                         break;
 229         } while ((stat & mask) != mask);
 230
 231         if (retry == 0) {
 232                 if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
 233                         return 0;
 234                 else {
 235                         printf("%s: Timeout for status update!\n", __func__);
 236                         return TIMEOUT;
 237                 }
 238         }
 239
 240         if ((stat & (SDHCI_INT_ERROR | mask)) == mask) {
 241                 sdhci_cmd_done(host, cmd);
 242                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
 243         } else
 244                 ret = -1;
 245
 246         if (!ret && data)
 247                 ret = sdhci_transfer_data(host, data, start_addr);
 248
 249         if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD)
 250                 udelay(1000);
 251
 252         stat = sdhci_readl(host, SDHCI_INT_STATUS);
 253         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 254         if (!ret) {
 255                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 256                                 !is_aligned && (data->flags == MMC_DATA_READ))
 257                         memcpy(data->dest, aligned_buffer, trans_bytes);
 258                 return 0;
 259         }
 260
 261         sdhci_reset(host, SDHCI_RESET_CMD);
 262         sdhci_reset(host, SDHCI_RESET_DATA);
 263         if (stat & SDHCI_INT_TIMEOUT)
 264                 return TIMEOUT;
 265         else
 266                 return COMM_ERR;
 267 }
 268
 269 static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
 270 {
 271         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 272         unsigned int div, clk, timeout;
 273
 274         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
 275
 276         if (clock == 0)
 277                 return 0;
 278
 279         if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
 280                 /* Version 3.00 divisors must be a multiple of 2. */
 281                 if (mmc->f_max <= clock)
 282                         div = 1;
 283                 else {
 284                         for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
 285                                 if ((mmc->f_max / div) <= clock)
 286                                         break;
 287                         }
 288                 }
 289         } else {
 290                 /* Version 2.00 divisors must be a power of 2. */
 291                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
 292                         if ((mmc->f_max / div) <= clock)
 293                                 break;
 294                 }
 295         }
 296         div >>= 1;
 297
 298         if (host->set_clock)
 299                 host->set_clock(host->index, div);
 300
 301         clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
 302         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
 303                 << SDHCI_DIVIDER_HI_SHIFT;
 304         clk |= SDHCI_CLOCK_INT_EN;
 305         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 306
 307         /* Wait max 20 ms */
 308         timeout = 20;
 309         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
 310                 & SDHCI_CLOCK_INT_STABLE)) {
 311                 if (timeout == 0) {
 312                         printf("%s: Internal clock never stabilised.\n",
 313                                __func__);
 314                         return -1;
 315                 }
 316                 timeout--;
 317                 udelay(1000);
 318         }
 319
 320         clk |= SDHCI_CLOCK_CARD_EN;
 321         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 322         return 0;
 323 }
 324
 325 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 326 {
 327         u8 pwr = 0;
 328
 329         if (power != (unsigned short)-1) {
 330                 switch (1 << power) {
 331                 case MMC_VDD_165_195:
 332                         pwr = SDHCI_POWER_180;
 333                         break;
 334                 case MMC_VDD_29_30:
 335                 case MMC_VDD_30_31:
 336                         pwr = SDHCI_POWER_300;
 337                         break;
 338                 case MMC_VDD_32_33:
 339                 case MMC_VDD_33_34:
 340                         pwr = SDHCI_POWER_330;
 341                         break;
 342                 }
 343         }
 344
 345         if (pwr == 0) {
 346                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
 347                 return;
 348         }
 349
 350         if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
 351                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
 352
 353         pwr |= SDHCI_POWER_ON;
 354
 355         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
 356 }
 357
 358 void sdhci_set_ios(struct mmc *mmc)
 359 {
 360         u32 ctrl;
 361         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 362
 363         if (host->set_control_reg)
 364                 host->set_control_reg(host);
 365
 366         if (mmc->clock != host->clock)
 367                 sdhci_set_clock(mmc, mmc->clock);
 368
 369         /* Set bus width */
 370         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 371         if (mmc->bus_width == 8) {
 372                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 373                 if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) ||
 374                                 (host->quirks & SDHCI_QUIRK_USE_WIDE8))
 375                         ctrl |= SDHCI_CTRL_8BITBUS;
 376         } else {
 377                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 378                         ctrl &= ~SDHCI_CTRL_8BITBUS;
 379                 if (mmc->bus_width == 4)
 380                         ctrl |= SDHCI_CTRL_4BITBUS;
 381                 else
 382                         ctrl &= ~SDHCI_CTRL_4BITBUS;
 383         }
 384
 385         if (mmc->clock > 26000000)
 386                 ctrl |= SDHCI_CTRL_HISPD;
 387         else
 388                 ctrl &= ~SDHCI_CTRL_HISPD;
 389
 390         if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
 391                 ctrl &= ~SDHCI_CTRL_HISPD;
 392
 393         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 394 }
 395
 396 int sdhci_init(struct mmc *mmc)
 397 {
 398         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 399
 400         if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) && !aligned_buffer) {
 401                 aligned_buffer = memalign(8, 512*1024);
 402                 if (!aligned_buffer) {
 403                         printf("%s: Aligned buffer alloc failed!!!\n",
 404                                __func__);
 405                         return -1;
 406                 }
 407         }
 408
 409         sdhci_set_power(host, fls(mmc->voltages) - 1);
 410
 411         if (host->quirks & SDHCI_QUIRK_NO_CD) {
 412                 unsigned int status;
 413
 414                 sdhci_writel(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
 415                         SDHCI_HOST_CONTROL);
 416
 417                 status = sdhci_readl(host, SDHCI_PRESENT_STATE);
 418                 while ((!(status & SDHCI_CARD_PRESENT)) ||
 419                     (!(status & SDHCI_CARD_STATE_STABLE)) ||
 420                     (!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
 421                         status = sdhci_readl(host, SDHCI_PRESENT_STATE);
 422         }
 423
 424         /* Enable only interrupts served by the SD controller */
 425         sdhci_writel(host, SDHCI_INT_DATA_MASK | SDHCI_INT_CMD_MASK,
 426                      SDHCI_INT_ENABLE);
 427         /* Mask all sdhci interrupt sources */
 428         sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);
 429
 430         return 0;
 431 }
 432
 433 int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
 434 {
 435         struct mmc *mmc;
 436         unsigned int caps;
 437
 438         mmc = malloc(sizeof(struct mmc));
 439         if (!mmc) {
 440                 printf("%s: mmc malloc fail!\n", __func__);
 441                 return -1;
 442         }
 443
 444         mmc->priv = host;
 445         host->mmc = mmc;
 446
 447         sprintf(mmc->name, "%s", host->name);
 448         mmc->send_cmd = sdhci_send_command;
 449         mmc->set_ios = sdhci_set_ios;
 450         mmc->init = sdhci_init;
 451         mmc->getcd = NULL;
 452         mmc->getwp = NULL;
 453
 454         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 455 #ifdef CONFIG_MMC_SDMA
 456         if (!(caps & SDHCI_CAN_DO_SDMA)) {
 457                 printf("%s: Your controller doesn't support SDMA!!\n",
 458                        __func__);
 459                 return -1;
 460         }
 461 #endif
 462
 463         if (max_clk)
 464                 mmc->f_max = max_clk;
 465         else {
 466                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 467                         mmc->f_max = (caps & SDHCI_CLOCK_V3_BASE_MASK)
 468                                 >> SDHCI_CLOCK_BASE_SHIFT;
 469                 else
 470                         mmc->f_max = (caps & SDHCI_CLOCK_BASE_MASK)
 471                                 >> SDHCI_CLOCK_BASE_SHIFT;
 472                 mmc->f_max *= 1000000;
 473         }
 474         if (mmc->f_max == 0) {
 475                 printf("%s: Hardware doesn't specify base clock frequency\n",
 476                        __func__);
 477                 return -1;
 478         }
 479         if (min_clk)
 480                 mmc->f_min = min_clk;
 481         else {
 482                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 483                         mmc->f_min = mmc->f_max / SDHCI_MAX_DIV_SPEC_300;
 484                 else
 485                         mmc->f_min = mmc->f_max / SDHCI_MAX_DIV_SPEC_200;
 486         }
 487
 488         mmc->voltages = 0;
 489         if (caps & SDHCI_CAN_VDD_330)
 490                 mmc->voltages |= MMC_VDD_32_33 | MMC_VDD_33_34;
 491         if (caps & SDHCI_CAN_VDD_300)
 492                 mmc->voltages |= MMC_VDD_29_30 | MMC_VDD_30_31;
 493         if (caps & SDHCI_CAN_VDD_180)
 494                 mmc->voltages |= MMC_VDD_165_195;
 495
 496         if (host->quirks & SDHCI_QUIRK_BROKEN_VOLTAGE)
 497                 mmc->voltages |= host->voltages;
 498
 499         mmc->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT;
 500         if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
 501                 if (caps & SDHCI_CAN_DO_8BIT)
 502                         mmc->host_caps |= MMC_MODE_8BIT;
 503         }
 504         if (host->host_caps)
 505                 mmc->host_caps |= host->host_caps;
 506
 507         sdhci_reset(host, SDHCI_RESET_ALL);
 508         mmc_register(mmc);
 509
 510         return 0;
 511 }