drivers/mmc/arm_pl180_mmci.c

   1 /*
   2  * ARM PrimeCell MultiMedia Card Interface - PL180
   3  *
   4  * Copyright (C) ST-Ericsson SA 2010
   5  *
   6  * Author: Ulf Hansson <ulf.hansson@stericsson.com>
   7  * Author: Martin Lundholm <martin.xa.lundholm@stericsson.com>
   8  * Ported to drivers/mmc/ by: Matt Waddel <matt.waddel@linaro.org>
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 /* #define DEBUG */
  14
  15 #include <asm/io.h>
  16 #include "common.h"
  17 #include <errno.h>
  18 #include <mmc.h>
  19 #include "arm_pl180_mmci.h"
  20 #include <malloc.h>
  21
  22 static int wait_for_command_end(struct mmc *dev, struct mmc_cmd *cmd)
  23 {
  24         u32 hoststatus, statusmask;
  25         struct pl180_mmc_host *host = dev->priv;
  26
  27         statusmask = SDI_STA_CTIMEOUT | SDI_STA_CCRCFAIL;
  28         if ((cmd->resp_type & MMC_RSP_PRESENT))
  29                 statusmask |= SDI_STA_CMDREND;
  30         else
  31                 statusmask |= SDI_STA_CMDSENT;
  32
  33         do
  34                 hoststatus = readl(&host->base->status) & statusmask;
  35         while (!hoststatus);
  36
  37         writel(statusmask, &host->base->status_clear);
  38         if (hoststatus & SDI_STA_CTIMEOUT) {
  39                 debug("CMD%d time out\n", cmd->cmdidx);
  40                 return TIMEOUT;
  41         } else if ((hoststatus & SDI_STA_CCRCFAIL) &&
  42                    (cmd->resp_type & MMC_RSP_CRC)) {
  43                 printf("CMD%d CRC error\n", cmd->cmdidx);
  44                 return -EILSEQ;
  45         }
  46
  47         if (cmd->resp_type & MMC_RSP_PRESENT) {
  48                 cmd->response[0] = readl(&host->base->response0);
  49                 cmd->response[1] = readl(&host->base->response1);
  50                 cmd->response[2] = readl(&host->base->response2);
  51                 cmd->response[3] = readl(&host->base->response3);
  52                 debug("CMD%d response[0]:0x%08X, response[1]:0x%08X, "
  53                         "response[2]:0x%08X, response[3]:0x%08X\n",
  54                         cmd->cmdidx, cmd->response[0], cmd->response[1],
  55                         cmd->response[2], cmd->response[3]);
  56         }
  57
  58         return 0;
  59 }
  60
  61 /* send command to the mmc card and wait for results */
  62 static int do_command(struct mmc *dev, struct mmc_cmd *cmd)
  63 {
  64         int result;
  65         u32 sdi_cmd = 0;
  66         struct pl180_mmc_host *host = dev->priv;
  67
  68         sdi_cmd = ((cmd->cmdidx & SDI_CMD_CMDINDEX_MASK) | SDI_CMD_CPSMEN);
  69
  70         if (cmd->resp_type) {
  71                 sdi_cmd |= SDI_CMD_WAITRESP;
  72                 if (cmd->resp_type & MMC_RSP_136)
  73                         sdi_cmd |= SDI_CMD_LONGRESP;
  74         }
  75
  76         writel((u32)cmd->cmdarg, &host->base->argument);
  77         udelay(COMMAND_REG_DELAY);
  78         writel(sdi_cmd, &host->base->command);
  79         result = wait_for_command_end(dev, cmd);
  80
  81         /* After CMD2 set RCA to a none zero value. */
  82         if ((result == 0) && (cmd->cmdidx == MMC_CMD_ALL_SEND_CID))
  83                 dev->rca = 10;
  84
  85         /* After CMD3 open drain is switched off and push pull is used. */
  86         if ((result == 0) && (cmd->cmdidx == MMC_CMD_SET_RELATIVE_ADDR)) {
  87                 u32 sdi_pwr = readl(&host->base->power) & ~SDI_PWR_OPD;
  88                 writel(sdi_pwr, &host->base->power);
  89         }
  90
  91         return result;
  92 }
  93
  94 static int read_bytes(struct mmc *dev, u32 *dest, u32 blkcount, u32 blksize)
  95 {
  96         u32 *tempbuff = dest;
  97         u64 xfercount = blkcount * blksize;
  98         struct pl180_mmc_host *host = dev->priv;
  99         u32 status, status_err;
 100
 101         debug("read_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
 102
 103         status = readl(&host->base->status);
 104         status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
 105                                SDI_STA_RXOVERR);
 106         while ((!status_err) && (xfercount >= sizeof(u32))) {
 107                 if (status & SDI_STA_RXDAVL) {
 108                         *(tempbuff) = readl(&host->base->fifo);
 109                         tempbuff++;
 110                         xfercount -= sizeof(u32);
 111                 }
 112                 status = readl(&host->base->status);
 113                 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT |
 114                                        SDI_STA_RXOVERR);
 115         }
 116
 117         status_err = status &
 118                 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
 119                  SDI_STA_RXOVERR);
 120         while (!status_err) {
 121                 status = readl(&host->base->status);
 122                 status_err = status &
 123                         (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND |
 124                          SDI_STA_RXOVERR);
 125         }
 126
 127         if (status & SDI_STA_DTIMEOUT) {
 128                 printf("Read data timed out, xfercount: %llu, status: 0x%08X\n",
 129                         xfercount, status);
 130                 return -ETIMEDOUT;
 131         } else if (status & SDI_STA_DCRCFAIL) {
 132                 printf("Read data bytes CRC error: 0x%x\n", status);
 133                 return -EILSEQ;
 134         } else if (status & SDI_STA_RXOVERR) {
 135                 printf("Read data RX overflow error\n");
 136                 return -EIO;
 137         }
 138
 139         writel(SDI_ICR_MASK, &host->base->status_clear);
 140
 141         if (xfercount) {
 142                 printf("Read data error, xfercount: %llu\n", xfercount);
 143                 return -ENOBUFS;
 144         }
 145
 146         return 0;
 147 }
 148
 149 static int write_bytes(struct mmc *dev, u32 *src, u32 blkcount, u32 blksize)
 150 {
 151         u32 *tempbuff = src;
 152         int i;
 153         u64 xfercount = blkcount * blksize;
 154         struct pl180_mmc_host *host = dev->priv;
 155         u32 status, status_err;
 156
 157         debug("write_bytes: blkcount=%u blksize=%u\n", blkcount, blksize);
 158
 159         status = readl(&host->base->status);
 160         status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
 161         while (!status_err && xfercount) {
 162                 if (status & SDI_STA_TXFIFOBW) {
 163                         if (xfercount >= SDI_FIFO_BURST_SIZE * sizeof(u32)) {
 164                                 for (i = 0; i < SDI_FIFO_BURST_SIZE; i++)
 165                                         writel(*(tempbuff + i),
 166                                                 &host->base->fifo);
 167                                 tempbuff += SDI_FIFO_BURST_SIZE;
 168                                 xfercount -= SDI_FIFO_BURST_SIZE * sizeof(u32);
 169                         } else {
 170                                 while (xfercount >= sizeof(u32)) {
 171                                         writel(*(tempbuff), &host->base->fifo);
 172                                         tempbuff++;
 173                                         xfercount -= sizeof(u32);
 174                                 }
 175                         }
 176                 }
 177                 status = readl(&host->base->status);
 178                 status_err = status & (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT);
 179         }
 180
 181         status_err = status &
 182                 (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
 183         while (!status_err) {
 184                 status = readl(&host->base->status);
 185                 status_err = status &
 186                         (SDI_STA_DCRCFAIL | SDI_STA_DTIMEOUT | SDI_STA_DBCKEND);
 187         }
 188
 189         if (status & SDI_STA_DTIMEOUT) {
 190                 printf("Write data timed out, xfercount:%llu,status:0x%08X\n",
 191                        xfercount, status);
 192                 return -ETIMEDOUT;
 193         } else if (status & SDI_STA_DCRCFAIL) {
 194                 printf("Write data CRC error\n");
 195                 return -EILSEQ;
 196         }
 197
 198         writel(SDI_ICR_MASK, &host->base->status_clear);
 199
 200         if (xfercount) {
 201                 printf("Write data error, xfercount:%llu", xfercount);
 202                 return -ENOBUFS;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int do_data_transfer(struct mmc *dev,
 209                             struct mmc_cmd *cmd,
 210                             struct mmc_data *data)
 211 {
 212         int error = -ETIMEDOUT;
 213         struct pl180_mmc_host *host = dev->priv;
 214         u32 blksz = 0;
 215         u32 data_ctrl = 0;
 216         u32 data_len = (u32) (data->blocks * data->blocksize);
 217
 218         if (!host->version2) {
 219                 blksz = (ffs(data->blocksize) - 1);
 220                 data_ctrl |= ((blksz << 4) & SDI_DCTRL_DBLKSIZE_MASK);
 221         } else {
 222                 blksz = data->blocksize;
 223                 data_ctrl |= (blksz << SDI_DCTRL_DBLOCKSIZE_V2_SHIFT);
 224         }
 225         data_ctrl |= SDI_DCTRL_DTEN | SDI_DCTRL_BUSYMODE;
 226
 227         writel(SDI_DTIMER_DEFAULT, &host->base->datatimer);
 228         writel(data_len, &host->base->datalength);
 229         udelay(DATA_REG_DELAY);
 230
 231         if (data->flags & MMC_DATA_READ) {
 232                 data_ctrl |= SDI_DCTRL_DTDIR_IN;
 233                 writel(data_ctrl, &host->base->datactrl);
 234
 235                 error = do_command(dev, cmd);
 236                 if (error)
 237                         return error;
 238
 239                 error = read_bytes(dev, (u32 *)data->dest, (u32)data->blocks,
 240                                    (u32)data->blocksize);
 241         } else if (data->flags & MMC_DATA_WRITE) {
 242                 error = do_command(dev, cmd);
 243                 if (error)
 244                         return error;
 245
 246                 writel(data_ctrl, &host->base->datactrl);
 247                 error = write_bytes(dev, (u32 *)data->src, (u32)data->blocks,
 248                                                         (u32)data->blocksize);
 249         }
 250
 251         return error;
 252 }
 253
 254 static int host_request(struct mmc *dev,
 255                         struct mmc_cmd *cmd,
 256                         struct mmc_data *data)
 257 {
 258         int result;
 259
 260         if (data)
 261                 result = do_data_transfer(dev, cmd, data);
 262         else
 263                 result = do_command(dev, cmd);
 264
 265         return result;
 266 }
 267
 268 /* MMC uses open drain drivers in the enumeration phase */
 269 static int mmc_host_reset(struct mmc *dev)
 270 {
 271         struct pl180_mmc_host *host = dev->priv;
 272
 273         writel(host->pwr_init, &host->base->power);
 274
 275         return 0;
 276 }
 277
 278 static void host_set_ios(struct mmc *dev)
 279 {
 280         struct pl180_mmc_host *host = dev->priv;
 281         u32 sdi_clkcr;
 282
 283         sdi_clkcr = readl(&host->base->clock);
 284
 285         /* Ramp up the clock rate */
 286         if (dev->clock) {
 287                 u32 clkdiv = 0;
 288                 u32 tmp_clock;
 289
 290                 if (dev->clock >= dev->f_max) {
 291                         clkdiv = 0;
 292                         dev->clock = dev->f_max;
 293                 } else {
 294                         clkdiv = (host->clock_in / dev->clock) - 2;
 295                 }
 296
 297                 tmp_clock = host->clock_in / (clkdiv + 2);
 298                 while (tmp_clock > dev->clock) {
 299                         clkdiv++;
 300                         tmp_clock = host->clock_in / (clkdiv + 2);
 301                 }
 302
 303                 if (clkdiv > SDI_CLKCR_CLKDIV_MASK)
 304                         clkdiv = SDI_CLKCR_CLKDIV_MASK;
 305
 306                 tmp_clock = host->clock_in / (clkdiv + 2);
 307                 dev->clock = tmp_clock;
 308                 sdi_clkcr &= ~(SDI_CLKCR_CLKDIV_MASK);
 309                 sdi_clkcr |= clkdiv;
 310         }
 311
 312         /* Set the bus width */
 313         if (dev->bus_width) {
 314                 u32 buswidth = 0;
 315
 316                 switch (dev->bus_width) {
 317                 case 1:
 318                         buswidth |= SDI_CLKCR_WIDBUS_1;
 319                         break;
 320                 case 4:
 321                         buswidth |= SDI_CLKCR_WIDBUS_4;
 322                         break;
 323                 case 8:
 324                         buswidth |= SDI_CLKCR_WIDBUS_8;
 325                         break;
 326                 default:
 327                         printf("Invalid bus width: %d\n", dev->bus_width);
 328                         break;
 329                 }
 330                 sdi_clkcr &= ~(SDI_CLKCR_WIDBUS_MASK);
 331                 sdi_clkcr |= buswidth;
 332         }
 333
 334         writel(sdi_clkcr, &host->base->clock);
 335         udelay(CLK_CHANGE_DELAY);
 336 }
 337
 338 /*
 339  * mmc_host_init - initialize the mmc controller.
 340  * Set initial clock and power for mmc slot.
 341  * Initialize mmc struct and register with mmc framework.
 342  */
 343 int arm_pl180_mmci_init(struct pl180_mmc_host *host)
 344 {
 345         struct mmc *dev;
 346         u32 sdi_u32;
 347
 348         dev = malloc(sizeof(struct mmc));
 349         if (!dev)
 350                 return -ENOMEM;
 351
 352         memset(dev, 0, sizeof(struct mmc));
 353         dev->priv = host;
 354
 355         writel(host->pwr_init, &host->base->power);
 356         writel(host->clkdiv_init, &host->base->clock);
 357         udelay(CLK_CHANGE_DELAY);
 358
 359         /* Disable mmc interrupts */
 360         sdi_u32 = readl(&host->base->mask0) & ~SDI_MASK0_MASK;
 361         writel(sdi_u32, &host->base->mask0);
 362         strncpy(dev->name, host->name, sizeof(dev->name));
 363         dev->send_cmd = host_request;
 364         dev->set_ios = host_set_ios;
 365         dev->init = mmc_host_reset;
 366         dev->getcd = NULL;
 367         dev->getwp = NULL;
 368         dev->host_caps = host->caps;
 369         dev->voltages = host->voltages;
 370         dev->f_min = host->clock_min;
 371         dev->f_max = host->clock_max;
 372         dev->b_max = host->b_max;
 373         mmc_register(dev);
 374         debug("registered mmc interface number is:%d\n", dev->block_dev.dev);
 375
 376         return 0;
 377 }