drivers/mmc/host/sdhci.c

   1 /*
   2  *  linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
   3  *
   4  *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * Thanks to the following companies for their support:
  12  *
  13  *     - JMicron (hardware and technical support)
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/highmem.h>
  18 #include <linux/io.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include <linux/leds.h>
  23
  24 #include <linux/mmc/host.h>
  25
  26 #include "sdhci.h"
  27
  28 #define DRIVER_NAME "sdhci"
  29
  30 #define DBG(f, x...) \
  31         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  32
  33 static unsigned int debug_quirks = 0;
  34
  35 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  36 static void sdhci_finish_data(struct sdhci_host *);
  37
  38 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  39 static void sdhci_finish_command(struct sdhci_host *);
  40
  41 static void sdhci_dumpregs(struct sdhci_host *host)
  42 {
  43         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  44
  45         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  46                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
  47                 readw(host->ioaddr + SDHCI_HOST_VERSION));
  48         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  49                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
  50                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
  51         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  52                 readl(host->ioaddr + SDHCI_ARGUMENT),
  53                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
  54         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  55                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
  56                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
  57         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  58                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
  59                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
  60         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  61                 readb(host->ioaddr + SDHCI_WAKE_UP_CONTROL),
  62                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
  63         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
  64                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
  65                 readl(host->ioaddr + SDHCI_INT_STATUS));
  66         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
  67                 readl(host->ioaddr + SDHCI_INT_ENABLE),
  68                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
  69         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
  70                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
  71                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
  72         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
  73                 readl(host->ioaddr + SDHCI_CAPABILITIES),
  74                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
  75
  76         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
  77 }
  78
  79 /*****************************************************************************\
  80  *                                                                           *
  81  * Low level functions                                                       *
  82  *                                                                           *
  83 \*****************************************************************************/
  84
  85 static void sdhci_reset(struct sdhci_host *host, u8 mask)
  86 {
  87         unsigned long timeout;
  88
  89         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
  90                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
  91                         SDHCI_CARD_PRESENT))
  92                         return;
  93         }
  94
  95         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
  96
  97         if (mask & SDHCI_RESET_ALL)
  98                 host->clock = 0;
  99
 100         /* Wait max 100 ms */
 101         timeout = 100;
 102
 103         /* hw clears the bit when it's done */
 104         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
 105                 if (timeout == 0) {
 106                         printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
 107                                 mmc_hostname(host->mmc), (int)mask);
 108                         sdhci_dumpregs(host);
 109                         return;
 110                 }
 111                 timeout--;
 112                 mdelay(1);
 113         }
 114 }
 115
 116 static void sdhci_init(struct sdhci_host *host)
 117 {
 118         u32 intmask;
 119
 120         sdhci_reset(host, SDHCI_RESET_ALL);
 121
 122         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 123                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 124                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 125                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
 126                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
 127                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
 128
 129         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 130         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 131 }
 132
 133 static void sdhci_activate_led(struct sdhci_host *host)
 134 {
 135         u8 ctrl;
 136
 137         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 138         ctrl |= SDHCI_CTRL_LED;
 139         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 140 }
 141
 142 static void sdhci_deactivate_led(struct sdhci_host *host)
 143 {
 144         u8 ctrl;
 145
 146         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 147         ctrl &= ~SDHCI_CTRL_LED;
 148         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 149 }
 150
 151 #ifdef CONFIG_LEDS_CLASS
 152 static void sdhci_led_control(struct led_classdev *led,
 153         enum led_brightness brightness)
 154 {
 155         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 156         unsigned long flags;
 157
 158         spin_lock_irqsave(&host->lock, flags);
 159
 160         if (brightness == LED_OFF)
 161                 sdhci_deactivate_led(host);
 162         else
 163                 sdhci_activate_led(host);
 164
 165         spin_unlock_irqrestore(&host->lock, flags);
 166 }
 167 #endif
 168
 169 /*****************************************************************************\
 170  *                                                                           *
 171  * Core functions                                                            *
 172  *                                                                           *
 173 \*****************************************************************************/
 174
 175 static inline char* sdhci_sg_to_buffer(struct sdhci_host* host)
 176 {
 177         return sg_virt(host->cur_sg);
 178 }
 179
 180 static inline int sdhci_next_sg(struct sdhci_host* host)
 181 {
 182         /*
 183          * Skip to next SG entry.
 184          */
 185         host->cur_sg++;
 186         host->num_sg--;
 187
 188         /*
 189          * Any entries left?
 190          */
 191         if (host->num_sg > 0) {
 192                 host->offset = 0;
 193                 host->remain = host->cur_sg->length;
 194         }
 195
 196         return host->num_sg;
 197 }
 198
 199 static void sdhci_read_block_pio(struct sdhci_host *host)
 200 {
 201         int blksize, chunk_remain;
 202         u32 data;
 203         char *buffer;
 204         int size;
 205
 206         DBG("PIO reading\n");
 207
 208         blksize = host->data->blksz;
 209         chunk_remain = 0;
 210         data = 0;
 211
 212         buffer = sdhci_sg_to_buffer(host) + host->offset;
 213
 214         while (blksize) {
 215                 if (chunk_remain == 0) {
 216                         data = readl(host->ioaddr + SDHCI_BUFFER);
 217                         chunk_remain = min(blksize, 4);
 218                 }
 219
 220                 size = min(host->remain, chunk_remain);
 221
 222                 chunk_remain -= size;
 223                 blksize -= size;
 224                 host->offset += size;
 225                 host->remain -= size;
 226
 227                 while (size) {
 228                         *buffer = data & 0xFF;
 229                         buffer++;
 230                         data >>= 8;
 231                         size--;
 232                 }
 233
 234                 if (host->remain == 0) {
 235                         if (sdhci_next_sg(host) == 0) {
 236                                 BUG_ON(blksize != 0);
 237                                 return;
 238                         }
 239                         buffer = sdhci_sg_to_buffer(host);
 240                 }
 241         }
 242 }
 243
 244 static void sdhci_write_block_pio(struct sdhci_host *host)
 245 {
 246         int blksize, chunk_remain;
 247         u32 data;
 248         char *buffer;
 249         int bytes, size;
 250
 251         DBG("PIO writing\n");
 252
 253         blksize = host->data->blksz;
 254         chunk_remain = 4;
 255         data = 0;
 256
 257         bytes = 0;
 258         buffer = sdhci_sg_to_buffer(host) + host->offset;
 259
 260         while (blksize) {
 261                 size = min(host->remain, chunk_remain);
 262
 263                 chunk_remain -= size;
 264                 blksize -= size;
 265                 host->offset += size;
 266                 host->remain -= size;
 267
 268                 while (size) {
 269                         data >>= 8;
 270                         data |= (u32)*buffer << 24;
 271                         buffer++;
 272                         size--;
 273                 }
 274
 275                 if (chunk_remain == 0) {
 276                         writel(data, host->ioaddr + SDHCI_BUFFER);
 277                         chunk_remain = min(blksize, 4);
 278                 }
 279
 280                 if (host->remain == 0) {
 281                         if (sdhci_next_sg(host) == 0) {
 282                                 BUG_ON(blksize != 0);
 283                                 return;
 284                         }
 285                         buffer = sdhci_sg_to_buffer(host);
 286                 }
 287         }
 288 }
 289
 290 static void sdhci_transfer_pio(struct sdhci_host *host)
 291 {
 292         u32 mask;
 293
 294         BUG_ON(!host->data);
 295
 296         if (host->num_sg == 0)
 297                 return;
 298
 299         if (host->data->flags & MMC_DATA_READ)
 300                 mask = SDHCI_DATA_AVAILABLE;
 301         else
 302                 mask = SDHCI_SPACE_AVAILABLE;
 303
 304         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 305                 if (host->data->flags & MMC_DATA_READ)
 306                         sdhci_read_block_pio(host);
 307                 else
 308                         sdhci_write_block_pio(host);
 309
 310                 if (host->num_sg == 0)
 311                         break;
 312         }
 313
 314         DBG("PIO transfer complete.\n");
 315 }
 316
 317 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data)
 318 {
 319         u8 count;
 320         unsigned target_timeout, current_timeout;
 321
 322         /*
 323          * If the host controller provides us with an incorrect timeout
 324          * value, just skip the check and use 0xE.  The hardware may take
 325          * longer to time out, but that's much better than having a too-short
 326          * timeout value.
 327          */
 328         if ((host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL))
 329                 return 0xE;
 330
 331         /* timeout in us */
 332         target_timeout = data->timeout_ns / 1000 +
 333                 data->timeout_clks / host->clock;
 334
 335         /*
 336          * Figure out needed cycles.
 337          * We do this in steps in order to fit inside a 32 bit int.
 338          * The first step is the minimum timeout, which will have a
 339          * minimum resolution of 6 bits:
 340          * (1) 2^13*1000 > 2^22,
 341          * (2) host->timeout_clk < 2^16
 342          *     =>
 343          *     (1) / (2) > 2^6
 344          */
 345         count = 0;
 346         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 347         while (current_timeout < target_timeout) {
 348                 count++;
 349                 current_timeout <<= 1;
 350                 if (count >= 0xF)
 351                         break;
 352         }
 353
 354         if (count >= 0xF) {
 355                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 356                         mmc_hostname(host->mmc));
 357                 count = 0xE;
 358         }
 359
 360         return count;
 361 }
 362
 363 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 364 {
 365         u8 count;
 366
 367         WARN_ON(host->data);
 368
 369         if (data == NULL)
 370                 return;
 371
 372         /* Sanity checks */
 373         BUG_ON(data->blksz * data->blocks > 524288);
 374         BUG_ON(data->blksz > host->mmc->max_blk_size);
 375         BUG_ON(data->blocks > 65535);
 376
 377         host->data = data;
 378         host->data_early = 0;
 379
 380         count = sdhci_calc_timeout(host, data);
 381         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 382
 383         if (host->flags & SDHCI_USE_DMA)
 384                 host->flags |= SDHCI_REQ_USE_DMA;
 385
 386         if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
 387                 (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) &&
 388                 ((data->blksz * data->blocks) & 0x3))) {
 389                 DBG("Reverting to PIO because of transfer size (%d)\n",
 390                         data->blksz * data->blocks);
 391                 host->flags &= ~SDHCI_REQ_USE_DMA;
 392         }
 393
 394         /*
 395          * The assumption here being that alignment is the same after
 396          * translation to device address space.
 397          */
 398         if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
 399                 (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 400                 (data->sg->offset & 0x3))) {
 401                 DBG("Reverting to PIO because of bad alignment\n");
 402                 host->flags &= ~SDHCI_REQ_USE_DMA;
 403         }
 404
 405         if (host->flags & SDHCI_REQ_USE_DMA) {
 406                 int count;
 407
 408                 count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 409                                 (data->flags & MMC_DATA_READ) ?
 410                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
 411                 WARN_ON(count != 1);
 412
 413                 writel(sg_dma_address(data->sg),
 414                         host->ioaddr + SDHCI_DMA_ADDRESS);
 415         } else {
 416                 host->cur_sg = data->sg;
 417                 host->num_sg = data->sg_len;
 418
 419                 host->offset = 0;
 420                 host->remain = host->cur_sg->length;
 421         }
 422
 423         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 424         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 425                 host->ioaddr + SDHCI_BLOCK_SIZE);
 426         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 427 }
 428
 429 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 430         struct mmc_data *data)
 431 {
 432         u16 mode;
 433
 434         if (data == NULL)
 435                 return;
 436
 437         WARN_ON(!host->data);
 438
 439         mode = SDHCI_TRNS_BLK_CNT_EN;
 440         if (data->blocks > 1)
 441                 mode |= SDHCI_TRNS_MULTI;
 442         if (data->flags & MMC_DATA_READ)
 443                 mode |= SDHCI_TRNS_READ;
 444         if (host->flags & SDHCI_REQ_USE_DMA)
 445                 mode |= SDHCI_TRNS_DMA;
 446
 447         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 448 }
 449
 450 static void sdhci_finish_data(struct sdhci_host *host)
 451 {
 452         struct mmc_data *data;
 453
 454         BUG_ON(!host->data);
 455
 456         data = host->data;
 457         host->data = NULL;
 458
 459         if (host->flags & SDHCI_REQ_USE_DMA) {
 460                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 461                         (data->flags & MMC_DATA_READ) ?
 462                                 DMA_FROM_DEVICE : DMA_TO_DEVICE);
 463         }
 464
 465         /*
 466          * The specification states that the block count register must
 467          * be updated, but it does not specify at what point in the
 468          * data flow. That makes the register entirely useless to read
 469          * back so we have to assume that nothing made it to the card
 470          * in the event of an error.
 471          */
 472         if (data->error)
 473                 data->bytes_xfered = 0;
 474         else
 475                 data->bytes_xfered = data->blksz * data->blocks;
 476
 477         if (data->stop) {
 478                 /*
 479                  * The controller needs a reset of internal state machines
 480                  * upon error conditions.
 481                  */
 482                 if (data->error) {
 483                         sdhci_reset(host, SDHCI_RESET_CMD);
 484                         sdhci_reset(host, SDHCI_RESET_DATA);
 485                 }
 486
 487                 sdhci_send_command(host, data->stop);
 488         } else
 489                 tasklet_schedule(&host->finish_tasklet);
 490 }
 491
 492 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 493 {
 494         int flags;
 495         u32 mask;
 496         unsigned long timeout;
 497
 498         WARN_ON(host->cmd);
 499
 500         /* Wait max 10 ms */
 501         timeout = 10;
 502
 503         mask = SDHCI_CMD_INHIBIT;
 504         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 505                 mask |= SDHCI_DATA_INHIBIT;
 506
 507         /* We shouldn't wait for data inihibit for stop commands, even
 508            though they might use busy signaling */
 509         if (host->mrq->data && (cmd == host->mrq->data->stop))
 510                 mask &= ~SDHCI_DATA_INHIBIT;
 511
 512         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 513                 if (timeout == 0) {
 514                         printk(KERN_ERR "%s: Controller never released "
 515                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 516                         sdhci_dumpregs(host);
 517                         cmd->error = -EIO;
 518                         tasklet_schedule(&host->finish_tasklet);
 519                         return;
 520                 }
 521                 timeout--;
 522                 mdelay(1);
 523         }
 524
 525         mod_timer(&host->timer, jiffies + 10 * HZ);
 526
 527         host->cmd = cmd;
 528
 529         sdhci_prepare_data(host, cmd->data);
 530
 531         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 532
 533         sdhci_set_transfer_mode(host, cmd->data);
 534
 535         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 536                 printk(KERN_ERR "%s: Unsupported response type!\n",
 537                         mmc_hostname(host->mmc));
 538                 cmd->error = -EINVAL;
 539                 tasklet_schedule(&host->finish_tasklet);
 540                 return;
 541         }
 542
 543         if (!(cmd->flags & MMC_RSP_PRESENT))
 544                 flags = SDHCI_CMD_RESP_NONE;
 545         else if (cmd->flags & MMC_RSP_136)
 546                 flags = SDHCI_CMD_RESP_LONG;
 547         else if (cmd->flags & MMC_RSP_BUSY)
 548                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 549         else
 550                 flags = SDHCI_CMD_RESP_SHORT;
 551
 552         if (cmd->flags & MMC_RSP_CRC)
 553                 flags |= SDHCI_CMD_CRC;
 554         if (cmd->flags & MMC_RSP_OPCODE)
 555                 flags |= SDHCI_CMD_INDEX;
 556         if (cmd->data)
 557                 flags |= SDHCI_CMD_DATA;
 558
 559         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 560                 host->ioaddr + SDHCI_COMMAND);
 561 }
 562
 563 static void sdhci_finish_command(struct sdhci_host *host)
 564 {
 565         int i;
 566
 567         BUG_ON(host->cmd == NULL);
 568
 569         if (host->cmd->flags & MMC_RSP_PRESENT) {
 570                 if (host->cmd->flags & MMC_RSP_136) {
 571                         /* CRC is stripped so we need to do some shifting. */
 572                         for (i = 0;i < 4;i++) {
 573                                 host->cmd->resp[i] = readl(host->ioaddr +
 574                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 575                                 if (i != 3)
 576                                         host->cmd->resp[i] |=
 577                                                 readb(host->ioaddr +
 578                                                 SDHCI_RESPONSE + (3-i)*4-1);
 579                         }
 580                 } else {
 581                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 582                 }
 583         }
 584
 585         host->cmd->error = 0;
 586
 587         if (host->data && host->data_early)
 588                 sdhci_finish_data(host);
 589
 590         if (!host->cmd->data)
 591                 tasklet_schedule(&host->finish_tasklet);
 592
 593         host->cmd = NULL;
 594 }
 595
 596 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 597 {
 598         int div;
 599         u16 clk;
 600         unsigned long timeout;
 601
 602         if (clock == host->clock)
 603                 return;
 604
 605         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 606
 607         if (clock == 0)
 608                 goto out;
 609
 610         for (div = 1;div < 256;div *= 2) {
 611                 if ((host->max_clk / div) <= clock)
 612                         break;
 613         }
 614         div >>= 1;
 615
 616         clk = div << SDHCI_DIVIDER_SHIFT;
 617         clk |= SDHCI_CLOCK_INT_EN;
 618         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 619
 620         /* Wait max 10 ms */
 621         timeout = 10;
 622         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 623                 & SDHCI_CLOCK_INT_STABLE)) {
 624                 if (timeout == 0) {
 625                         printk(KERN_ERR "%s: Internal clock never "
 626                                 "stabilised.\n", mmc_hostname(host->mmc));
 627                         sdhci_dumpregs(host);
 628                         return;
 629                 }
 630                 timeout--;
 631                 mdelay(1);
 632         }
 633
 634         clk |= SDHCI_CLOCK_CARD_EN;
 635         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 636
 637 out:
 638         host->clock = clock;
 639 }
 640
 641 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 642 {
 643         u8 pwr;
 644
 645         if (host->power == power)
 646                 return;
 647
 648         if (power == (unsigned short)-1) {
 649                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 650                 goto out;
 651         }
 652
 653         /*
 654          * Spec says that we should clear the power reg before setting
 655          * a new value. Some controllers don't seem to like this though.
 656          */
 657         if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
 658                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 659
 660         pwr = SDHCI_POWER_ON;
 661
 662         switch (1 << power) {
 663         case MMC_VDD_165_195:
 664                 pwr |= SDHCI_POWER_180;
 665                 break;
 666         case MMC_VDD_29_30:
 667         case MMC_VDD_30_31:
 668                 pwr |= SDHCI_POWER_300;
 669                 break;
 670         case MMC_VDD_32_33:
 671         case MMC_VDD_33_34:
 672                 pwr |= SDHCI_POWER_330;
 673                 break;
 674         default:
 675                 BUG();
 676         }
 677
 678         /*
 679          * At least the CaFe chip gets confused if we set the voltage
 680          * and set turn on power at the same time, so set the voltage first.
 681          */
 682         if ((host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER))
 683                 writeb(pwr & ~SDHCI_POWER_ON,
 684                                 host->ioaddr + SDHCI_POWER_CONTROL);
 685
 686         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 687
 688 out:
 689         host->power = power;
 690 }
 691
 692 /*****************************************************************************\
 693  *                                                                           *
 694  * MMC callbacks                                                             *
 695  *                                                                           *
 696 \*****************************************************************************/
 697
 698 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 699 {
 700         struct sdhci_host *host;
 701         unsigned long flags;
 702
 703         host = mmc_priv(mmc);
 704
 705         spin_lock_irqsave(&host->lock, flags);
 706
 707         WARN_ON(host->mrq != NULL);
 708
 709 #ifndef CONFIG_LEDS_CLASS
 710         sdhci_activate_led(host);
 711 #endif
 712
 713         host->mrq = mrq;
 714
 715         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)
 716                 || (host->flags & SDHCI_DEVICE_DEAD)) {
 717                 host->mrq->cmd->error = -ENOMEDIUM;
 718                 tasklet_schedule(&host->finish_tasklet);
 719         } else
 720                 sdhci_send_command(host, mrq->cmd);
 721
 722         mmiowb();
 723         spin_unlock_irqrestore(&host->lock, flags);
 724 }
 725
 726 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 727 {
 728         struct sdhci_host *host;
 729         unsigned long flags;
 730         u8 ctrl;
 731
 732         host = mmc_priv(mmc);
 733
 734         spin_lock_irqsave(&host->lock, flags);
 735
 736         if (host->flags & SDHCI_DEVICE_DEAD)
 737                 goto out;
 738
 739         /*
 740          * Reset the chip on each power off.
 741          * Should clear out any weird states.
 742          */
 743         if (ios->power_mode == MMC_POWER_OFF) {
 744                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 745                 sdhci_init(host);
 746         }
 747
 748         sdhci_set_clock(host, ios->clock);
 749
 750         if (ios->power_mode == MMC_POWER_OFF)
 751                 sdhci_set_power(host, -1);
 752         else
 753                 sdhci_set_power(host, ios->vdd);
 754
 755         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 756
 757         if (ios->bus_width == MMC_BUS_WIDTH_4)
 758                 ctrl |= SDHCI_CTRL_4BITBUS;
 759         else
 760                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 761
 762         if (ios->timing == MMC_TIMING_SD_HS)
 763                 ctrl |= SDHCI_CTRL_HISPD;
 764         else
 765                 ctrl &= ~SDHCI_CTRL_HISPD;
 766
 767         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 768
 769         /*
 770          * Some (ENE) controllers go apeshit on some ios operation,
 771          * signalling timeout and CRC errors even on CMD0. Resetting
 772          * it on each ios seems to solve the problem.
 773          */
 774         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
 775                 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
 776
 777 out:
 778         mmiowb();
 779         spin_unlock_irqrestore(&host->lock, flags);
 780 }
 781
 782 static int sdhci_get_ro(struct mmc_host *mmc)
 783 {
 784         struct sdhci_host *host;
 785         unsigned long flags;
 786         int present;
 787
 788         host = mmc_priv(mmc);
 789
 790         spin_lock_irqsave(&host->lock, flags);
 791
 792         if (host->flags & SDHCI_DEVICE_DEAD)
 793                 present = 0;
 794         else
 795                 present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 796
 797         spin_unlock_irqrestore(&host->lock, flags);
 798
 799         return !(present & SDHCI_WRITE_PROTECT);
 800 }
 801
 802 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
 803 {
 804         struct sdhci_host *host;
 805         unsigned long flags;
 806         u32 ier;
 807
 808         host = mmc_priv(mmc);
 809
 810         spin_lock_irqsave(&host->lock, flags);
 811
 812         if (host->flags & SDHCI_DEVICE_DEAD)
 813                 goto out;
 814
 815         ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
 816
 817         ier &= ~SDHCI_INT_CARD_INT;
 818         if (enable)
 819                 ier |= SDHCI_INT_CARD_INT;
 820
 821         writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
 822         writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 823
 824 out:
 825         mmiowb();
 826
 827         spin_unlock_irqrestore(&host->lock, flags);
 828 }
 829
 830 static const struct mmc_host_ops sdhci_ops = {
 831         .request        = sdhci_request,
 832         .set_ios        = sdhci_set_ios,
 833         .get_ro         = sdhci_get_ro,
 834         .enable_sdio_irq = sdhci_enable_sdio_irq,
 835 };
 836
 837 /*****************************************************************************\
 838  *                                                                           *
 839  * Tasklets                                                                  *
 840  *                                                                           *
 841 \*****************************************************************************/
 842
 843 static void sdhci_tasklet_card(unsigned long param)
 844 {
 845         struct sdhci_host *host;
 846         unsigned long flags;
 847
 848         host = (struct sdhci_host*)param;
 849
 850         spin_lock_irqsave(&host->lock, flags);
 851
 852         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 853                 if (host->mrq) {
 854                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 855                                 mmc_hostname(host->mmc));
 856                         printk(KERN_ERR "%s: Resetting controller.\n",
 857                                 mmc_hostname(host->mmc));
 858
 859                         sdhci_reset(host, SDHCI_RESET_CMD);
 860                         sdhci_reset(host, SDHCI_RESET_DATA);
 861
 862                         host->mrq->cmd->error = -ENOMEDIUM;
 863                         tasklet_schedule(&host->finish_tasklet);
 864                 }
 865         }
 866
 867         spin_unlock_irqrestore(&host->lock, flags);
 868
 869         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 870 }
 871
 872 static void sdhci_tasklet_finish(unsigned long param)
 873 {
 874         struct sdhci_host *host;
 875         unsigned long flags;
 876         struct mmc_request *mrq;
 877
 878         host = (struct sdhci_host*)param;
 879
 880         spin_lock_irqsave(&host->lock, flags);
 881
 882         del_timer(&host->timer);
 883
 884         mrq = host->mrq;
 885
 886         /*
 887          * The controller needs a reset of internal state machines
 888          * upon error conditions.
 889          */
 890         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
 891                 (mrq->cmd->error ||
 892                  (mrq->data && (mrq->data->error ||
 893                   (mrq->data->stop && mrq->data->stop->error))) ||
 894                    (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
 895
 896                 /* Some controllers need this kick or reset won't work here */
 897                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 898                         unsigned int clock;
 899
 900                         /* This is to force an update */
 901                         clock = host->clock;
 902                         host->clock = 0;
 903                         sdhci_set_clock(host, clock);
 904                 }
 905
 906                 /* Spec says we should do both at the same time, but Ricoh
 907                    controllers do not like that. */
 908                 sdhci_reset(host, SDHCI_RESET_CMD);
 909                 sdhci_reset(host, SDHCI_RESET_DATA);
 910         }
 911
 912         host->mrq = NULL;
 913         host->cmd = NULL;
 914         host->data = NULL;
 915
 916 #ifndef CONFIG_LEDS_CLASS
 917         sdhci_deactivate_led(host);
 918 #endif
 919
 920         mmiowb();
 921         spin_unlock_irqrestore(&host->lock, flags);
 922
 923         mmc_request_done(host->mmc, mrq);
 924 }
 925
 926 static void sdhci_timeout_timer(unsigned long data)
 927 {
 928         struct sdhci_host *host;
 929         unsigned long flags;
 930
 931         host = (struct sdhci_host*)data;
 932
 933         spin_lock_irqsave(&host->lock, flags);
 934
 935         if (host->mrq) {
 936                 printk(KERN_ERR "%s: Timeout waiting for hardware "
 937                         "interrupt.\n", mmc_hostname(host->mmc));
 938                 sdhci_dumpregs(host);
 939
 940                 if (host->data) {
 941                         host->data->error = -ETIMEDOUT;
 942                         sdhci_finish_data(host);
 943                 } else {
 944                         if (host->cmd)
 945                                 host->cmd->error = -ETIMEDOUT;
 946                         else
 947                                 host->mrq->cmd->error = -ETIMEDOUT;
 948
 949                         tasklet_schedule(&host->finish_tasklet);
 950                 }
 951         }
 952
 953         mmiowb();
 954         spin_unlock_irqrestore(&host->lock, flags);
 955 }
 956
 957 /*****************************************************************************\
 958  *                                                                           *
 959  * Interrupt handling                                                        *
 960  *                                                                           *
 961 \*****************************************************************************/
 962
 963 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 964 {
 965         BUG_ON(intmask == 0);
 966
 967         if (!host->cmd) {
 968                 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
 969                         "though no command operation was in progress.\n",
 970                         mmc_hostname(host->mmc), (unsigned)intmask);
 971                 sdhci_dumpregs(host);
 972                 return;
 973         }
 974
 975         if (intmask & SDHCI_INT_TIMEOUT)
 976                 host->cmd->error = -ETIMEDOUT;
 977         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
 978                         SDHCI_INT_INDEX))
 979                 host->cmd->error = -EILSEQ;
 980
 981         if (host->cmd->error)
 982                 tasklet_schedule(&host->finish_tasklet);
 983         else if (intmask & SDHCI_INT_RESPONSE)
 984                 sdhci_finish_command(host);
 985 }
 986
 987 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 988 {
 989         BUG_ON(intmask == 0);
 990
 991         if (!host->data) {
 992                 /*
 993                  * A data end interrupt is sent together with the response
 994                  * for the stop command.
 995                  */
 996                 if (intmask & SDHCI_INT_DATA_END)
 997                         return;
 998
 999                 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
1000                         "though no data operation was in progress.\n",
1001                         mmc_hostname(host->mmc), (unsigned)intmask);
1002                 sdhci_dumpregs(host);
1003
1004                 return;
1005         }
1006
1007         if (intmask & SDHCI_INT_DATA_TIMEOUT)
1008                 host->data->error = -ETIMEDOUT;
1009         else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
1010                 host->data->error = -EILSEQ;
1011
1012         if (host->data->error)
1013                 sdhci_finish_data(host);
1014         else {
1015                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1016                         sdhci_transfer_pio(host);
1017
1018                 /*
1019                  * We currently don't do anything fancy with DMA
1020                  * boundaries, but as we can't disable the feature
1021                  * we need to at least restart the transfer.
1022                  */
1023                 if (intmask & SDHCI_INT_DMA_END)
1024                         writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1025                                 host->ioaddr + SDHCI_DMA_ADDRESS);
1026
1027                 if (intmask & SDHCI_INT_DATA_END) {
1028                         if (host->cmd) {
1029                                 /*
1030                                  * Data managed to finish before the
1031                                  * command completed. Make sure we do
1032                                  * things in the proper order.
1033                                  */
1034                                 host->data_early = 1;
1035                         } else {
1036                                 sdhci_finish_data(host);
1037                         }
1038                 }
1039         }
1040 }
1041
1042 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1043 {
1044         irqreturn_t result;
1045         struct sdhci_host* host = dev_id;
1046         u32 intmask;
1047         int cardint = 0;
1048
1049         spin_lock(&host->lock);
1050
1051         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1052
1053         if (!intmask || intmask == 0xffffffff) {
1054                 result = IRQ_NONE;
1055                 goto out;
1056         }
1057
1058         DBG("*** %s got interrupt: 0x%08x\n",
1059                 mmc_hostname(host->mmc), intmask);
1060
1061         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1062                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1063                         host->ioaddr + SDHCI_INT_STATUS);
1064                 tasklet_schedule(&host->card_tasklet);
1065         }
1066
1067         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1068
1069         if (intmask & SDHCI_INT_CMD_MASK) {
1070                 writel(intmask & SDHCI_INT_CMD_MASK,
1071                         host->ioaddr + SDHCI_INT_STATUS);
1072                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1073         }
1074
1075         if (intmask & SDHCI_INT_DATA_MASK) {
1076                 writel(intmask & SDHCI_INT_DATA_MASK,
1077                         host->ioaddr + SDHCI_INT_STATUS);
1078                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1079         }
1080
1081         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1082
1083         intmask &= ~SDHCI_INT_ERROR;
1084
1085         if (intmask & SDHCI_INT_BUS_POWER) {
1086                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1087                         mmc_hostname(host->mmc));
1088                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1089         }
1090
1091         intmask &= ~SDHCI_INT_BUS_POWER;
1092
1093         if (intmask & SDHCI_INT_CARD_INT)
1094                 cardint = 1;
1095
1096         intmask &= ~SDHCI_INT_CARD_INT;
1097
1098         if (intmask) {
1099                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1100                         mmc_hostname(host->mmc), intmask);
1101                 sdhci_dumpregs(host);
1102
1103                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1104         }
1105
1106         result = IRQ_HANDLED;
1107
1108         mmiowb();
1109 out:
1110         spin_unlock(&host->lock);
1111
1112         /*
1113          * We have to delay this as it calls back into the driver.
1114          */
1115         if (cardint)
1116                 mmc_signal_sdio_irq(host->mmc);
1117
1118         return result;
1119 }
1120
1121 /*****************************************************************************\
1122  *                                                                           *
1123  * Suspend/resume                                                            *
1124  *                                                                           *
1125 \*****************************************************************************/
1126
1127 #ifdef CONFIG_PM
1128
1129 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1130 {
1131         int ret;
1132
1133         ret = mmc_suspend_host(host->mmc, state);
1134         if (ret)
1135                 return ret;
1136
1137         free_irq(host->irq, host);
1138
1139         return 0;
1140 }
1141
1142 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1143
1144 int sdhci_resume_host(struct sdhci_host *host)
1145 {
1146         int ret;
1147
1148         if (host->flags & SDHCI_USE_DMA) {
1149                 if (host->ops->enable_dma)
1150                         host->ops->enable_dma(host);
1151         }
1152
1153         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1154                           mmc_hostname(host->mmc), host);
1155         if (ret)
1156                 return ret;
1157
1158         sdhci_init(host);
1159         mmiowb();
1160
1161         ret = mmc_resume_host(host->mmc);
1162         if (ret)
1163                 return ret;
1164
1165         return 0;
1166 }
1167
1168 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1169
1170 #endif /* CONFIG_PM */
1171
1172 /*****************************************************************************\
1173  *                                                                           *
1174  * Device allocation/registration                                            *
1175  *                                                                           *
1176 \*****************************************************************************/
1177
1178 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1179         size_t priv_size)
1180 {
1181         struct mmc_host *mmc;
1182         struct sdhci_host *host;
1183
1184         WARN_ON(dev == NULL);
1185
1186         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1187         if (!mmc)
1188                 return ERR_PTR(-ENOMEM);
1189
1190         host = mmc_priv(mmc);
1191         host->mmc = mmc;
1192
1193         return host;
1194 }
1195
1196 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1197
1198 int sdhci_add_host(struct sdhci_host *host)
1199 {
1200         struct mmc_host *mmc;
1201         unsigned int caps;
1202         unsigned int version;
1203         int ret;
1204
1205         WARN_ON(host == NULL);
1206         if (host == NULL)
1207                 return -EINVAL;
1208
1209         mmc = host->mmc;
1210
1211         if (debug_quirks)
1212                 host->quirks = debug_quirks;
1213
1214         sdhci_reset(host, SDHCI_RESET_ALL);
1215
1216         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1217         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1218         if (version > 1) {
1219                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1220                         "You may experience problems.\n", mmc_hostname(mmc),
1221                         version);
1222         }
1223
1224         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1225
1226         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1227                 host->flags |= SDHCI_USE_DMA;
1228         else if (!(caps & SDHCI_CAN_DO_DMA))
1229                 DBG("Controller doesn't have DMA capability\n");
1230         else
1231                 host->flags |= SDHCI_USE_DMA;
1232
1233         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1234                 (host->flags & SDHCI_USE_DMA)) {
1235                 DBG("Disabling DMA as it is marked broken\n");
1236                 host->flags &= ~SDHCI_USE_DMA;
1237         }
1238
1239         if (host->flags & SDHCI_USE_DMA) {
1240                 if (host->ops->enable_dma) {
1241                         if (host->ops->enable_dma(host)) {
1242                                 printk(KERN_WARNING "%s: No suitable DMA "
1243                                         "available. Falling back to PIO.\n",
1244                                         mmc_hostname(mmc));
1245                                 host->flags &= ~SDHCI_USE_DMA;
1246                         }
1247                 }
1248         }
1249
1250         /* XXX: Hack to get MMC layer to avoid highmem */
1251         if (!(host->flags & SDHCI_USE_DMA))
1252                 mmc_dev(host->mmc)->dma_mask = 0;
1253
1254         host->max_clk =
1255                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1256         if (host->max_clk == 0) {
1257                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1258                         "frequency.\n", mmc_hostname(mmc));
1259                 return -ENODEV;
1260         }
1261         host->max_clk *= 1000000;
1262
1263         host->timeout_clk =
1264                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1265         if (host->timeout_clk == 0) {
1266                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1267                         "frequency.\n", mmc_hostname(mmc));
1268                 return -ENODEV;
1269         }
1270         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1271                 host->timeout_clk *= 1000;
1272
1273         /*
1274          * Set host parameters.
1275          */
1276         mmc->ops = &sdhci_ops;
1277         mmc->f_min = host->max_clk / 256;
1278         mmc->f_max = host->max_clk;
1279         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1280
1281         if (caps & SDHCI_CAN_DO_HISPD)
1282                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1283
1284         mmc->ocr_avail = 0;
1285         if (caps & SDHCI_CAN_VDD_330)
1286                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1287         if (caps & SDHCI_CAN_VDD_300)
1288                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1289         if (caps & SDHCI_CAN_VDD_180)
1290                 mmc->ocr_avail |= MMC_VDD_165_195;
1291
1292         if (mmc->ocr_avail == 0) {
1293                 printk(KERN_ERR "%s: Hardware doesn't report any "
1294                         "support voltages.\n", mmc_hostname(mmc));
1295                 return -ENODEV;
1296         }
1297
1298         spin_lock_init(&host->lock);
1299
1300         /*
1301          * Maximum number of segments. Hardware cannot do scatter lists.
1302          */
1303         if (host->flags & SDHCI_USE_DMA)
1304                 mmc->max_hw_segs = 1;
1305         else
1306                 mmc->max_hw_segs = 16;
1307         mmc->max_phys_segs = 16;
1308
1309         /*
1310          * Maximum number of sectors in one transfer. Limited by DMA boundary
1311          * size (512KiB).
1312          */
1313         mmc->max_req_size = 524288;
1314
1315         /*
1316          * Maximum segment size. Could be one segment with the maximum number
1317          * of bytes.
1318          */
1319         mmc->max_seg_size = mmc->max_req_size;
1320
1321         /*
1322          * Maximum block size. This varies from controller to controller and
1323          * is specified in the capabilities register.
1324          */
1325         mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1326         if (mmc->max_blk_size >= 3) {
1327                 printk(KERN_WARNING "%s: Invalid maximum block size, "
1328                         "assuming 512 bytes\n", mmc_hostname(mmc));
1329                 mmc->max_blk_size = 512;
1330         } else
1331                 mmc->max_blk_size = 512 << mmc->max_blk_size;
1332
1333         /*
1334          * Maximum block count.
1335          */
1336         mmc->max_blk_count = 65535;
1337
1338         /*
1339          * Init tasklets.
1340          */
1341         tasklet_init(&host->card_tasklet,
1342                 sdhci_tasklet_card, (unsigned long)host);
1343         tasklet_init(&host->finish_tasklet,
1344                 sdhci_tasklet_finish, (unsigned long)host);
1345
1346         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1347
1348         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1349                 mmc_hostname(mmc), host);
1350         if (ret)
1351                 goto untasklet;
1352
1353         sdhci_init(host);
1354
1355 #ifdef CONFIG_MMC_DEBUG
1356         sdhci_dumpregs(host);
1357 #endif
1358
1359 #ifdef CONFIG_LEDS_CLASS
1360         host->led.name = mmc_hostname(mmc);
1361         host->led.brightness = LED_OFF;
1362         host->led.default_trigger = mmc_hostname(mmc);
1363         host->led.brightness_set = sdhci_led_control;
1364
1365         ret = led_classdev_register(mmc_dev(mmc), &host->led);
1366         if (ret)
1367                 goto reset;
1368 #endif
1369
1370         mmiowb();
1371
1372         mmc_add_host(mmc);
1373
1374         printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s\n",
1375                 mmc_hostname(mmc), host->hw_name, mmc_dev(mmc)->bus_id,
1376                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1377
1378         return 0;
1379
1380 #ifdef CONFIG_LEDS_CLASS
1381 reset:
1382         sdhci_reset(host, SDHCI_RESET_ALL);
1383         free_irq(host->irq, host);
1384 #endif
1385 untasklet:
1386         tasklet_kill(&host->card_tasklet);
1387         tasklet_kill(&host->finish_tasklet);
1388
1389         return ret;
1390 }
1391
1392 EXPORT_SYMBOL_GPL(sdhci_add_host);
1393
1394 void sdhci_remove_host(struct sdhci_host *host, int dead)
1395 {
1396         unsigned long flags;
1397
1398         if (dead) {
1399                 spin_lock_irqsave(&host->lock, flags);
1400
1401                 host->flags |= SDHCI_DEVICE_DEAD;
1402
1403                 if (host->mrq) {
1404                         printk(KERN_ERR "%s: Controller removed during "
1405                                 " transfer!\n", mmc_hostname(host->mmc));
1406
1407                         host->mrq->cmd->error = -ENOMEDIUM;
1408                         tasklet_schedule(&host->finish_tasklet);
1409                 }
1410
1411                 spin_unlock_irqrestore(&host->lock, flags);
1412         }
1413
1414         mmc_remove_host(host->mmc);
1415
1416 #ifdef CONFIG_LEDS_CLASS
1417         led_classdev_unregister(&host->led);
1418 #endif
1419
1420         if (!dead)
1421                 sdhci_reset(host, SDHCI_RESET_ALL);
1422
1423         free_irq(host->irq, host);
1424
1425         del_timer_sync(&host->timer);
1426
1427         tasklet_kill(&host->card_tasklet);
1428         tasklet_kill(&host->finish_tasklet);
1429 }
1430
1431 EXPORT_SYMBOL_GPL(sdhci_remove_host);
1432
1433 void sdhci_free_host(struct sdhci_host *host)
1434 {
1435         mmc_free_host(host->mmc);
1436 }
1437
1438 EXPORT_SYMBOL_GPL(sdhci_free_host);
1439
1440 /*****************************************************************************\
1441  *                                                                           *
1442  * Driver init/exit                                                          *
1443  *                                                                           *
1444 \*****************************************************************************/
1445
1446 static int __init sdhci_drv_init(void)
1447 {
1448         printk(KERN_INFO DRIVER_NAME
1449                 ": Secure Digital Host Controller Interface driver\n");
1450         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1451
1452         return 0;
1453 }
1454
1455 static void __exit sdhci_drv_exit(void)
1456 {
1457 }
1458
1459 module_init(sdhci_drv_init);
1460 module_exit(sdhci_drv_exit);
1461
1462 module_param(debug_quirks, uint, 0444);
1463
1464 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1465 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
1466 MODULE_LICENSE("GPL");
1467
1468 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");