drivers/mmc/sdhci.c

   1 /*
   2  * Copyright 2011, Marvell Semiconductor Inc.
   3  * Lei Wen <leiwen@marvell.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  *
  23  * Back ported to the 8xx platform (from the 8260 platform) by
  24  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
  25  */
  26
  27 #include <common.h>
  28 #include <malloc.h>
  29 #include <mmc.h>
  30 #include <sdhci.h>
  31
  32 void *aligned_buffer;
  33
  34 static void sdhci_reset(struct sdhci_host *host, u8 mask)
  35 {
  36         unsigned long timeout;
  37
  38         /* Wait max 100 ms */
  39         timeout = 100;
  40         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
  41         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
  42                 if (timeout == 0) {
  43                         printf("Reset 0x%x never completed.\n", (int)mask);
  44                         return;
  45                 }
  46                 timeout--;
  47                 udelay(1000);
  48         }
  49 }
  50
  51 static void sdhci_cmd_done(struct sdhci_host *host, struct mmc_cmd *cmd)
  52 {
  53         int i;
  54         if (cmd->resp_type & MMC_RSP_136) {
  55                 /* CRC is stripped so we need to do some shifting. */
  56                 for (i = 0; i < 4; i++) {
  57                         cmd->response[i] = sdhci_readl(host,
  58                                         SDHCI_RESPONSE + (3-i)*4) << 8;
  59                         if (i != 3)
  60                                 cmd->response[i] |= sdhci_readb(host,
  61                                                 SDHCI_RESPONSE + (3-i)*4-1);
  62                 }
  63         } else {
  64                 cmd->response[0] = sdhci_readl(host, SDHCI_RESPONSE);
  65         }
  66 }
  67
  68 static void sdhci_transfer_pio(struct sdhci_host *host, struct mmc_data *data)
  69 {
  70         int i;
  71         char *offs;
  72         for (i = 0; i < data->blocksize; i += 4) {
  73                 offs = data->dest + i;
  74                 if (data->flags == MMC_DATA_READ)
  75                         *(u32 *)offs = sdhci_readl(host, SDHCI_BUFFER);
  76                 else
  77                         sdhci_writel(host, *(u32 *)offs, SDHCI_BUFFER);
  78         }
  79 }
  80
  81 static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
  82                                 unsigned int start_addr)
  83 {
  84         unsigned int stat, rdy, mask, timeout, block = 0;
  85
  86         timeout = 10000;
  87         rdy = SDHCI_INT_SPACE_AVAIL | SDHCI_INT_DATA_AVAIL;
  88         mask = SDHCI_DATA_AVAILABLE | SDHCI_SPACE_AVAILABLE;
  89         do {
  90                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
  91                 if (stat & SDHCI_INT_ERROR) {
  92                         printf("Error detected in status(0x%X)!\n", stat);
  93                         return -1;
  94                 }
  95                 if (stat & rdy) {
  96                         if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & mask))
  97                                 continue;
  98                         sdhci_writel(host, rdy, SDHCI_INT_STATUS);
  99                         sdhci_transfer_pio(host, data);
 100                         data->dest += data->blocksize;
 101                         if (++block >= data->blocks)
 102                                 break;
 103                 }
 104 #ifdef CONFIG_MMC_SDMA
 105                 if (stat & SDHCI_INT_DMA_END) {
 106                         sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
 107                         start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
 108                         start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
 109                         sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 110                 }
 111 #endif
 112                 if (timeout-- > 0)
 113                         udelay(10);
 114                 else {
 115                         printf("Transfer data timeout\n");
 116                         return -1;
 117                 }
 118         } while (!(stat & SDHCI_INT_DATA_END));
 119         return 0;
 120 }
 121
 122 int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 123                        struct mmc_data *data)
 124 {
 125         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 126         unsigned int stat = 0;
 127         int ret = 0;
 128         int trans_bytes = 0, is_aligned = 1;
 129         u32 mask, flags, mode;
 130         unsigned int timeout, start_addr = 0;
 131         unsigned int retry = 10000;
 132
 133         /* Wait max 10 ms */
 134         timeout = 10;
 135
 136         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 137         mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;
 138
 139         /* We shouldn't wait for data inihibit for stop commands, even
 140            though they might use busy signaling */
 141         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 142                 mask &= ~SDHCI_DATA_INHIBIT;
 143
 144         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 145                 if (timeout == 0) {
 146                         printf("Controller never released inhibit bit(s).\n");
 147                         return COMM_ERR;
 148                 }
 149                 timeout--;
 150                 udelay(1000);
 151         }
 152
 153         mask = SDHCI_INT_RESPONSE;
 154         if (!(cmd->resp_type & MMC_RSP_PRESENT))
 155                 flags = SDHCI_CMD_RESP_NONE;
 156         else if (cmd->resp_type & MMC_RSP_136)
 157                 flags = SDHCI_CMD_RESP_LONG;
 158         else if (cmd->resp_type & MMC_RSP_BUSY) {
 159                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 160                 mask |= SDHCI_INT_DATA_END;
 161         } else
 162                 flags = SDHCI_CMD_RESP_SHORT;
 163
 164         if (cmd->resp_type & MMC_RSP_CRC)
 165                 flags |= SDHCI_CMD_CRC;
 166         if (cmd->resp_type & MMC_RSP_OPCODE)
 167                 flags |= SDHCI_CMD_INDEX;
 168         if (data)
 169                 flags |= SDHCI_CMD_DATA;
 170
 171         /*Set Transfer mode regarding to data flag*/
 172         if (data != 0) {
 173                 sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
 174                 mode = SDHCI_TRNS_BLK_CNT_EN;
 175                 trans_bytes = data->blocks * data->blocksize;
 176                 if (data->blocks > 1)
 177                         mode |= SDHCI_TRNS_MULTI;
 178
 179                 if (data->flags == MMC_DATA_READ)
 180                         mode |= SDHCI_TRNS_READ;
 181
 182 #ifdef CONFIG_MMC_SDMA
 183                 if (data->flags == MMC_DATA_READ)
 184                         start_addr = (unsigned int)data->dest;
 185                 else
 186                         start_addr = (unsigned int)data->src;
 187                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 188                                 (start_addr & 0x7) != 0x0) {
 189                         is_aligned = 0;
 190                         start_addr = (unsigned int)aligned_buffer;
 191                         if (data->flags != MMC_DATA_READ)
 192                                 memcpy(aligned_buffer, data->src, trans_bytes);
 193                 }
 194
 195                 sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 196                 mode |= SDHCI_TRNS_DMA;
 197 #endif
 198                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 199                                 data->blocksize),
 200                                 SDHCI_BLOCK_SIZE);
 201                 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 202                 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 203         }
 204
 205         sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
 206 #ifdef CONFIG_MMC_SDMA
 207         flush_cache(start_addr, trans_bytes);
 208 #endif
 209         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
 210         do {
 211                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
 212                 if (stat & SDHCI_INT_ERROR)
 213                         break;
 214                 if (--retry == 0)
 215                         break;
 216         } while ((stat & mask) != mask);
 217
 218         if (retry == 0) {
 219                 if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
 220                         return 0;
 221                 else {
 222                         printf("Timeout for status update!\n");
 223                         return TIMEOUT;
 224                 }
 225         }
 226
 227         if ((stat & (SDHCI_INT_ERROR | mask)) == mask) {
 228                 sdhci_cmd_done(host, cmd);
 229                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
 230         } else
 231                 ret = -1;
 232
 233         if (!ret && data)
 234                 ret = sdhci_transfer_data(host, data, start_addr);
 235
 236         stat = sdhci_readl(host, SDHCI_INT_STATUS);
 237         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 238         if (!ret) {
 239                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 240                                 !is_aligned && (data->flags == MMC_DATA_READ))
 241                         memcpy(data->dest, aligned_buffer, trans_bytes);
 242                 return 0;
 243         }
 244
 245         sdhci_reset(host, SDHCI_RESET_CMD);
 246         sdhci_reset(host, SDHCI_RESET_DATA);
 247         if (stat & SDHCI_INT_TIMEOUT)
 248                 return TIMEOUT;
 249         else
 250                 return COMM_ERR;
 251 }
 252
 253 static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
 254 {
 255         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 256         unsigned int div, clk, timeout;
 257
 258         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
 259
 260         if (clock == 0)
 261                 return 0;
 262
 263         if (host->version >= SDHCI_SPEC_300) {
 264                 /* Version 3.00 divisors must be a multiple of 2. */
 265                 if (mmc->f_max <= clock)
 266                         div = 1;
 267                 else {
 268                         for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
 269                                 if ((mmc->f_max / div) <= clock)
 270                                         break;
 271                         }
 272                 }
 273         } else {
 274                 /* Version 2.00 divisors must be a power of 2. */
 275                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
 276                         if ((mmc->f_max / div) <= clock)
 277                                 break;
 278                 }
 279         }
 280         div >>= 1;
 281
 282         clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
 283         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
 284                 << SDHCI_DIVIDER_HI_SHIFT;
 285         clk |= SDHCI_CLOCK_INT_EN;
 286         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 287
 288         /* Wait max 20 ms */
 289         timeout = 20;
 290         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
 291                 & SDHCI_CLOCK_INT_STABLE)) {
 292                 if (timeout == 0) {
 293                         printf("Internal clock never stabilised.\n");
 294                         return -1;
 295                 }
 296                 timeout--;
 297                 udelay(1000);
 298         }
 299
 300         clk |= SDHCI_CLOCK_CARD_EN;
 301         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 302         return 0;
 303 }
 304
 305 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 306 {
 307         u8 pwr = 0;
 308
 309         if (power != (unsigned short)-1) {
 310                 switch (1 << power) {
 311                 case MMC_VDD_165_195:
 312                         pwr = SDHCI_POWER_180;
 313                         break;
 314                 case MMC_VDD_29_30:
 315                 case MMC_VDD_30_31:
 316                         pwr = SDHCI_POWER_300;
 317                         break;
 318                 case MMC_VDD_32_33:
 319                 case MMC_VDD_33_34:
 320                         pwr = SDHCI_POWER_330;
 321                         break;
 322                 }
 323         }
 324
 325         if (pwr == 0) {
 326                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
 327                 return;
 328         }
 329
 330         pwr |= SDHCI_POWER_ON;
 331
 332         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
 333 }
 334
 335 void sdhci_set_ios(struct mmc *mmc)
 336 {
 337         u32 ctrl;
 338         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 339
 340         if (host->set_control_reg)
 341                 host->set_control_reg(host);
 342
 343         if (mmc->clock != host->clock)
 344                 sdhci_set_clock(mmc, mmc->clock);
 345
 346         /* Set bus width */
 347         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 348         if (mmc->bus_width == 8) {
 349                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 350                 if (host->version >= SDHCI_SPEC_300)
 351                         ctrl |= SDHCI_CTRL_8BITBUS;
 352         } else {
 353                 if (host->version >= SDHCI_SPEC_300)
 354                         ctrl &= ~SDHCI_CTRL_8BITBUS;
 355                 if (mmc->bus_width == 4)
 356                         ctrl |= SDHCI_CTRL_4BITBUS;
 357                 else
 358                         ctrl &= ~SDHCI_CTRL_4BITBUS;
 359         }
 360
 361         if (mmc->clock > 26000000)
 362                 ctrl |= SDHCI_CTRL_HISPD;
 363         else
 364                 ctrl &= ~SDHCI_CTRL_HISPD;
 365
 366         if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
 367                 ctrl &= ~SDHCI_CTRL_HISPD;
 368
 369         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 370 }
 371
 372 int sdhci_init(struct mmc *mmc)
 373 {
 374         struct sdhci_host *host = (struct sdhci_host *)mmc->priv;
 375
 376         if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) && !aligned_buffer) {
 377                 aligned_buffer = memalign(8, 512*1024);
 378                 if (!aligned_buffer) {
 379                         printf("Aligned buffer alloc failed!!!");
 380                         return -1;
 381                 }
 382         }
 383
 384         /* Eable all state */
 385         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_ENABLE);
 386         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_SIGNAL_ENABLE);
 387
 388         sdhci_set_power(host, fls(mmc->voltages) - 1);
 389
 390         return 0;
 391 }
 392
 393 int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
 394 {
 395         struct mmc *mmc;
 396         unsigned int caps;
 397
 398         mmc = malloc(sizeof(struct mmc));
 399         if (!mmc) {
 400                 printf("mmc malloc fail!\n");
 401                 return -1;
 402         }
 403
 404         mmc->priv = host;
 405         host->mmc = mmc;
 406
 407         sprintf(mmc->name, "%s", host->name);
 408         mmc->send_cmd = sdhci_send_command;
 409         mmc->set_ios = sdhci_set_ios;
 410         mmc->init = sdhci_init;
 411         mmc->getcd = NULL;
 412
 413         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 414 #ifdef CONFIG_MMC_SDMA
 415         if (!(caps & SDHCI_CAN_DO_SDMA)) {
 416                 printf("Your controller don't support sdma!!\n");
 417                 return -1;
 418         }
 419 #endif
 420
 421         if (max_clk)
 422                 mmc->f_max = max_clk;
 423         else {
 424                 if (host->version >= SDHCI_SPEC_300)
 425                         mmc->f_max = (caps & SDHCI_CLOCK_V3_BASE_MASK)
 426                                 >> SDHCI_CLOCK_BASE_SHIFT;
 427                 else
 428                         mmc->f_max = (caps & SDHCI_CLOCK_BASE_MASK)
 429                                 >> SDHCI_CLOCK_BASE_SHIFT;
 430                 mmc->f_max *= 1000000;
 431         }
 432         if (mmc->f_max == 0) {
 433                 printf("Hardware doesn't specify base clock frequency\n");
 434                 return -1;
 435         }
 436         if (min_clk)
 437                 mmc->f_min = min_clk;
 438         else {
 439                 if (host->version >= SDHCI_SPEC_300)
 440                         mmc->f_min = mmc->f_max / SDHCI_MAX_DIV_SPEC_300;
 441                 else
 442                         mmc->f_min = mmc->f_max / SDHCI_MAX_DIV_SPEC_200;
 443         }
 444
 445         mmc->voltages = 0;
 446         if (caps & SDHCI_CAN_VDD_330)
 447                 mmc->voltages |= MMC_VDD_32_33 | MMC_VDD_33_34;
 448         if (caps & SDHCI_CAN_VDD_300)
 449                 mmc->voltages |= MMC_VDD_29_30 | MMC_VDD_30_31;
 450         if (caps & SDHCI_CAN_VDD_180)
 451                 mmc->voltages |= MMC_VDD_165_195;
 452
 453         if (host->quirks & SDHCI_QUIRK_BROKEN_VOLTAGE)
 454                 mmc->voltages |= host->voltages;
 455
 456         mmc->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT;
 457         if (caps & SDHCI_CAN_DO_8BIT)
 458                 mmc->host_caps |= MMC_MODE_8BIT;
 459         if (host->host_caps)
 460                 mmc->host_caps |= host->host_caps;
 461
 462         sdhci_reset(host, SDHCI_RESET_ALL);
 463         mmc_register(mmc);
 464
 465         return 0;
 466 }