git.oblomov.eu Git - linux-2.6/blob - 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 void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 318 {
 319         u8 count;
 320         unsigned target_timeout, current_timeout;
 321
 322         WARN_ON(host->data);
 323
 324         if (data == NULL)
 325                 return;
 326
 327         /* Sanity checks */
 328         BUG_ON(data->blksz * data->blocks > 524288);
 329         BUG_ON(data->blksz > host->mmc->max_blk_size);
 330         BUG_ON(data->blocks > 65535);
 331
 332         host->data = data;
 333         host->data_early = 0;
 334
 335         /* timeout in us */
 336         target_timeout = data->timeout_ns / 1000 +
 337                 data->timeout_clks / host->clock;
 338
 339         /*
 340          * Figure out needed cycles.
 341          * We do this in steps in order to fit inside a 32 bit int.
 342          * The first step is the minimum timeout, which will have a
 343          * minimum resolution of 6 bits:
 344          * (1) 2^13*1000 > 2^22,
 345          * (2) host->timeout_clk < 2^16
 346          *     =>
 347          *     (1) / (2) > 2^6
 348          */
 349         count = 0;
 350         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 351         while (current_timeout < target_timeout) {
 352                 count++;
 353                 current_timeout <<= 1;
 354                 if (count >= 0xF)
 355                         break;
 356         }
 357
 358         /*
 359          * Compensate for an off-by-one error in the CaFe hardware; otherwise,
 360          * a too-small count gives us interrupt timeouts.
 361          */
 362         if ((host->quirks & SDHCI_QUIRK_INCR_TIMEOUT_CONTROL))
 363                 count++;
 364
 365         if (count >= 0xF) {
 366                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 367                         mmc_hostname(host->mmc));
 368                 count = 0xE;
 369         }
 370
 371         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 372
 373         if (host->flags & SDHCI_USE_DMA)
 374                 host->flags |= SDHCI_REQ_USE_DMA;
 375
 376         if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
 377                 (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) &&
 378                 ((data->blksz * data->blocks) & 0x3))) {
 379                 DBG("Reverting to PIO because of transfer size (%d)\n",
 380                         data->blksz * data->blocks);
 381                 host->flags &= ~SDHCI_REQ_USE_DMA;
 382         }
 383
 384         /*
 385          * The assumption here being that alignment is the same after
 386          * translation to device address space.
 387          */
 388         if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
 389                 (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 390                 (data->sg->offset & 0x3))) {
 391                 DBG("Reverting to PIO because of bad alignment\n");
 392                 host->flags &= ~SDHCI_REQ_USE_DMA;
 393         }
 394
 395         if (host->flags & SDHCI_REQ_USE_DMA) {
 396                 int count;
 397
 398                 count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 399                                 (data->flags & MMC_DATA_READ) ?
 400                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
 401                 WARN_ON(count != 1);
 402
 403                 writel(sg_dma_address(data->sg),
 404                         host->ioaddr + SDHCI_DMA_ADDRESS);
 405         } else {
 406                 host->cur_sg = data->sg;
 407                 host->num_sg = data->sg_len;
 408
 409                 host->offset = 0;
 410                 host->remain = host->cur_sg->length;
 411         }
 412
 413         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 414         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 415                 host->ioaddr + SDHCI_BLOCK_SIZE);
 416         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 417 }
 418
 419 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 420         struct mmc_data *data)
 421 {
 422         u16 mode;
 423
 424         if (data == NULL)
 425                 return;
 426
 427         WARN_ON(!host->data);
 428
 429         mode = SDHCI_TRNS_BLK_CNT_EN;
 430         if (data->blocks > 1)
 431                 mode |= SDHCI_TRNS_MULTI;
 432         if (data->flags & MMC_DATA_READ)
 433                 mode |= SDHCI_TRNS_READ;
 434         if (host->flags & SDHCI_REQ_USE_DMA)
 435                 mode |= SDHCI_TRNS_DMA;
 436
 437         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 438 }
 439
 440 static void sdhci_finish_data(struct sdhci_host *host)
 441 {
 442         struct mmc_data *data;
 443
 444         BUG_ON(!host->data);
 445
 446         data = host->data;
 447         host->data = NULL;
 448
 449         if (host->flags & SDHCI_REQ_USE_DMA) {
 450                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 451                         (data->flags & MMC_DATA_READ) ?
 452                                 DMA_FROM_DEVICE : DMA_TO_DEVICE);
 453         }
 454
 455         /*
 456          * The specification states that the block count register must
 457          * be updated, but it does not specify at what point in the
 458          * data flow. That makes the register entirely useless to read
 459          * back so we have to assume that nothing made it to the card
 460          * in the event of an error.
 461          */
 462         if (data->error)
 463                 data->bytes_xfered = 0;
 464         else
 465                 data->bytes_xfered = data->blksz * data->blocks;
 466
 467         if (data->stop) {
 468                 /*
 469                  * The controller needs a reset of internal state machines
 470                  * upon error conditions.
 471                  */
 472                 if (data->error) {
 473                         sdhci_reset(host, SDHCI_RESET_CMD);
 474                         sdhci_reset(host, SDHCI_RESET_DATA);
 475                 }
 476
 477                 sdhci_send_command(host, data->stop);
 478         } else
 479                 tasklet_schedule(&host->finish_tasklet);
 480 }
 481
 482 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 483 {
 484         int flags;
 485         u32 mask;
 486         unsigned long timeout;
 487
 488         WARN_ON(host->cmd);
 489
 490         /* Wait max 10 ms */
 491         timeout = 10;
 492
 493         mask = SDHCI_CMD_INHIBIT;
 494         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 495                 mask |= SDHCI_DATA_INHIBIT;
 496
 497         /* We shouldn't wait for data inihibit for stop commands, even
 498            though they might use busy signaling */
 499         if (host->mrq->data && (cmd == host->mrq->data->stop))
 500                 mask &= ~SDHCI_DATA_INHIBIT;
 501
 502         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 503                 if (timeout == 0) {
 504                         printk(KERN_ERR "%s: Controller never released "
 505                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 506                         sdhci_dumpregs(host);
 507                         cmd->error = -EIO;
 508                         tasklet_schedule(&host->finish_tasklet);
 509                         return;
 510                 }
 511                 timeout--;
 512                 mdelay(1);
 513         }
 514
 515         mod_timer(&host->timer, jiffies + 10 * HZ);
 516
 517         host->cmd = cmd;
 518
 519         sdhci_prepare_data(host, cmd->data);
 520
 521         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 522
 523         sdhci_set_transfer_mode(host, cmd->data);
 524
 525         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 526                 printk(KERN_ERR "%s: Unsupported response type!\n",
 527                         mmc_hostname(host->mmc));
 528                 cmd->error = -EINVAL;
 529                 tasklet_schedule(&host->finish_tasklet);
 530                 return;
 531         }
 532
 533         if (!(cmd->flags & MMC_RSP_PRESENT))
 534                 flags = SDHCI_CMD_RESP_NONE;
 535         else if (cmd->flags & MMC_RSP_136)
 536                 flags = SDHCI_CMD_RESP_LONG;
 537         else if (cmd->flags & MMC_RSP_BUSY)
 538                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 539         else
 540                 flags = SDHCI_CMD_RESP_SHORT;
 541
 542         if (cmd->flags & MMC_RSP_CRC)
 543                 flags |= SDHCI_CMD_CRC;
 544         if (cmd->flags & MMC_RSP_OPCODE)
 545                 flags |= SDHCI_CMD_INDEX;
 546         if (cmd->data)
 547                 flags |= SDHCI_CMD_DATA;
 548
 549         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 550                 host->ioaddr + SDHCI_COMMAND);
 551 }
 552
 553 static void sdhci_finish_command(struct sdhci_host *host)
 554 {
 555         int i;
 556
 557         BUG_ON(host->cmd == NULL);
 558
 559         if (host->cmd->flags & MMC_RSP_PRESENT) {
 560                 if (host->cmd->flags & MMC_RSP_136) {
 561                         /* CRC is stripped so we need to do some shifting. */
 562                         for (i = 0;i < 4;i++) {
 563                                 host->cmd->resp[i] = readl(host->ioaddr +
 564                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 565                                 if (i != 3)
 566                                         host->cmd->resp[i] |=
 567                                                 readb(host->ioaddr +
 568                                                 SDHCI_RESPONSE + (3-i)*4-1);
 569                         }
 570                 } else {
 571                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 572                 }
 573         }
 574
 575         host->cmd->error = 0;
 576
 577         if (host->data && host->data_early)
 578                 sdhci_finish_data(host);
 579
 580         if (!host->cmd->data)
 581                 tasklet_schedule(&host->finish_tasklet);
 582
 583         host->cmd = NULL;
 584 }
 585
 586 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 587 {
 588         int div;
 589         u16 clk;
 590         unsigned long timeout;
 591
 592         if (clock == host->clock)
 593                 return;
 594
 595         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 596
 597         if (clock == 0)
 598                 goto out;
 599
 600         for (div = 1;div < 256;div *= 2) {
 601                 if ((host->max_clk / div) <= clock)
 602                         break;
 603         }
 604         div >>= 1;
 605
 606         clk = div << SDHCI_DIVIDER_SHIFT;
 607         clk |= SDHCI_CLOCK_INT_EN;
 608         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 609
 610         /* Wait max 10 ms */
 611         timeout = 10;
 612         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 613                 & SDHCI_CLOCK_INT_STABLE)) {
 614                 if (timeout == 0) {
 615                         printk(KERN_ERR "%s: Internal clock never "
 616                                 "stabilised.\n", mmc_hostname(host->mmc));
 617                         sdhci_dumpregs(host);
 618                         return;
 619                 }
 620                 timeout--;
 621                 mdelay(1);
 622         }
 623
 624         clk |= SDHCI_CLOCK_CARD_EN;
 625         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 626
 627 out:
 628         host->clock = clock;
 629 }
 630
 631 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 632 {
 633         u8 pwr;
 634
 635         if (host->power == power)
 636                 return;
 637
 638         if (power == (unsigned short)-1) {
 639                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 640                 goto out;
 641         }
 642
 643         /*
 644          * Spec says that we should clear the power reg before setting
 645          * a new value. Some controllers don't seem to like this though.
 646          */
 647         if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
 648                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 649
 650         pwr = SDHCI_POWER_ON;
 651
 652         switch (1 << power) {
 653         case MMC_VDD_165_195:
 654                 pwr |= SDHCI_POWER_180;
 655                 break;
 656         case MMC_VDD_29_30:
 657         case MMC_VDD_30_31:
 658                 pwr |= SDHCI_POWER_300;
 659                 break;
 660         case MMC_VDD_32_33:
 661         case MMC_VDD_33_34:
 662                 pwr |= SDHCI_POWER_330;
 663                 break;
 664         default:
 665                 BUG();
 666         }
 667
 668         /*
 669          * At least the CaFe chip gets confused if we set the voltage
 670          * and set turn on power at the same time, so set the voltage first.
 671          */
 672         if ((host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER))
 673                 writeb(pwr & ~SDHCI_POWER_ON,
 674                                 host->ioaddr + SDHCI_POWER_CONTROL);
 675
 676         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 677
 678 out:
 679         host->power = power;
 680 }
 681
 682 /*****************************************************************************\
 683  *                                                                           *
 684  * MMC callbacks                                                             *
 685  *                                                                           *
 686 \*****************************************************************************/
 687
 688 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 689 {
 690         struct sdhci_host *host;
 691         unsigned long flags;
 692
 693         host = mmc_priv(mmc);
 694
 695         spin_lock_irqsave(&host->lock, flags);
 696
 697         WARN_ON(host->mrq != NULL);
 698
 699 #ifndef CONFIG_LEDS_CLASS
 700         sdhci_activate_led(host);
 701 #endif
 702
 703         host->mrq = mrq;
 704
 705         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 706                 host->mrq->cmd->error = -ENOMEDIUM;
 707                 tasklet_schedule(&host->finish_tasklet);
 708         } else
 709                 sdhci_send_command(host, mrq->cmd);
 710
 711         mmiowb();
 712         spin_unlock_irqrestore(&host->lock, flags);
 713 }
 714
 715 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 716 {
 717         struct sdhci_host *host;
 718         unsigned long flags;
 719         u8 ctrl;
 720
 721         host = mmc_priv(mmc);
 722
 723         spin_lock_irqsave(&host->lock, flags);
 724
 725         /*
 726          * Reset the chip on each power off.
 727          * Should clear out any weird states.
 728          */
 729         if (ios->power_mode == MMC_POWER_OFF) {
 730                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 731                 sdhci_init(host);
 732         }
 733
 734         sdhci_set_clock(host, ios->clock);
 735
 736         if (ios->power_mode == MMC_POWER_OFF)
 737                 sdhci_set_power(host, -1);
 738         else
 739                 sdhci_set_power(host, ios->vdd);
 740
 741         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 742
 743         if (ios->bus_width == MMC_BUS_WIDTH_4)
 744                 ctrl |= SDHCI_CTRL_4BITBUS;
 745         else
 746                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 747
 748         if (ios->timing == MMC_TIMING_SD_HS)
 749                 ctrl |= SDHCI_CTRL_HISPD;
 750         else
 751                 ctrl &= ~SDHCI_CTRL_HISPD;
 752
 753         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 754
 755         /*
 756          * Some (ENE) controllers go apeshit on some ios operation,
 757          * signalling timeout and CRC errors even on CMD0. Resetting
 758          * it on each ios seems to solve the problem.
 759          */
 760         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
 761                 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
 762
 763         mmiowb();
 764         spin_unlock_irqrestore(&host->lock, flags);
 765 }
 766
 767 static int sdhci_get_ro(struct mmc_host *mmc)
 768 {
 769         struct sdhci_host *host;
 770         unsigned long flags;
 771         int present;
 772
 773         host = mmc_priv(mmc);
 774
 775         spin_lock_irqsave(&host->lock, flags);
 776
 777         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 778
 779         spin_unlock_irqrestore(&host->lock, flags);
 780
 781         return !(present & SDHCI_WRITE_PROTECT);
 782 }
 783
 784 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
 785 {
 786         struct sdhci_host *host;
 787         unsigned long flags;
 788         u32 ier;
 789
 790         host = mmc_priv(mmc);
 791
 792         spin_lock_irqsave(&host->lock, flags);
 793
 794         ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
 795
 796         ier &= ~SDHCI_INT_CARD_INT;
 797         if (enable)
 798                 ier |= SDHCI_INT_CARD_INT;
 799
 800         writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
 801         writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 802
 803         mmiowb();
 804
 805         spin_unlock_irqrestore(&host->lock, flags);
 806 }
 807
 808 static const struct mmc_host_ops sdhci_ops = {
 809         .request        = sdhci_request,
 810         .set_ios        = sdhci_set_ios,
 811         .get_ro         = sdhci_get_ro,
 812         .enable_sdio_irq = sdhci_enable_sdio_irq,
 813 };
 814
 815 /*****************************************************************************\
 816  *                                                                           *
 817  * Tasklets                                                                  *
 818  *                                                                           *
 819 \*****************************************************************************/
 820
 821 static void sdhci_tasklet_card(unsigned long param)
 822 {
 823         struct sdhci_host *host;
 824         unsigned long flags;
 825
 826         host = (struct sdhci_host*)param;
 827
 828         spin_lock_irqsave(&host->lock, flags);
 829
 830         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 831                 if (host->mrq) {
 832                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 833                                 mmc_hostname(host->mmc));
 834                         printk(KERN_ERR "%s: Resetting controller.\n",
 835                                 mmc_hostname(host->mmc));
 836
 837                         sdhci_reset(host, SDHCI_RESET_CMD);
 838                         sdhci_reset(host, SDHCI_RESET_DATA);
 839
 840                         host->mrq->cmd->error = -ENOMEDIUM;
 841                         tasklet_schedule(&host->finish_tasklet);
 842                 }
 843         }
 844
 845         spin_unlock_irqrestore(&host->lock, flags);
 846
 847         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 848 }
 849
 850 static void sdhci_tasklet_finish(unsigned long param)
 851 {
 852         struct sdhci_host *host;
 853         unsigned long flags;
 854         struct mmc_request *mrq;
 855
 856         host = (struct sdhci_host*)param;
 857
 858         spin_lock_irqsave(&host->lock, flags);
 859
 860         del_timer(&host->timer);
 861
 862         mrq = host->mrq;
 863
 864         /*
 865          * The controller needs a reset of internal state machines
 866          * upon error conditions.
 867          */
 868         if (mrq->cmd->error ||
 869                 (mrq->data && (mrq->data->error ||
 870                 (mrq->data->stop && mrq->data->stop->error))) ||
 871                 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)) {
 872
 873                 /* Some controllers need this kick or reset won't work here */
 874                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 875                         unsigned int clock;
 876
 877                         /* This is to force an update */
 878                         clock = host->clock;
 879                         host->clock = 0;
 880                         sdhci_set_clock(host, clock);
 881                 }
 882
 883                 /* Spec says we should do both at the same time, but Ricoh
 884                    controllers do not like that. */
 885                 sdhci_reset(host, SDHCI_RESET_CMD);
 886                 sdhci_reset(host, SDHCI_RESET_DATA);
 887         }
 888
 889         host->mrq = NULL;
 890         host->cmd = NULL;
 891         host->data = NULL;
 892
 893 #ifndef CONFIG_LEDS_CLASS
 894         sdhci_deactivate_led(host);
 895 #endif
 896
 897         mmiowb();
 898         spin_unlock_irqrestore(&host->lock, flags);
 899
 900         mmc_request_done(host->mmc, mrq);
 901 }
 902
 903 static void sdhci_timeout_timer(unsigned long data)
 904 {
 905         struct sdhci_host *host;
 906         unsigned long flags;
 907
 908         host = (struct sdhci_host*)data;
 909
 910         spin_lock_irqsave(&host->lock, flags);
 911
 912         if (host->mrq) {
 913                 printk(KERN_ERR "%s: Timeout waiting for hardware "
 914                         "interrupt.\n", mmc_hostname(host->mmc));
 915                 sdhci_dumpregs(host);
 916
 917                 if (host->data) {
 918                         host->data->error = -ETIMEDOUT;
 919                         sdhci_finish_data(host);
 920                 } else {
 921                         if (host->cmd)
 922                                 host->cmd->error = -ETIMEDOUT;
 923                         else
 924                                 host->mrq->cmd->error = -ETIMEDOUT;
 925
 926                         tasklet_schedule(&host->finish_tasklet);
 927                 }
 928         }
 929
 930         mmiowb();
 931         spin_unlock_irqrestore(&host->lock, flags);
 932 }
 933
 934 /*****************************************************************************\
 935  *                                                                           *
 936  * Interrupt handling                                                        *
 937  *                                                                           *
 938 \*****************************************************************************/
 939
 940 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 941 {
 942         BUG_ON(intmask == 0);
 943
 944         if (!host->cmd) {
 945                 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
 946                         "though no command operation was in progress.\n",
 947                         mmc_hostname(host->mmc), (unsigned)intmask);
 948                 sdhci_dumpregs(host);
 949                 return;
 950         }
 951
 952         if (intmask & SDHCI_INT_TIMEOUT)
 953                 host->cmd->error = -ETIMEDOUT;
 954         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
 955                         SDHCI_INT_INDEX))
 956                 host->cmd->error = -EILSEQ;
 957
 958         if (host->cmd->error)
 959                 tasklet_schedule(&host->finish_tasklet);
 960         else if (intmask & SDHCI_INT_RESPONSE)
 961                 sdhci_finish_command(host);
 962 }
 963
 964 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 965 {
 966         BUG_ON(intmask == 0);
 967
 968         if (!host->data) {
 969                 /*
 970                  * A data end interrupt is sent together with the response
 971                  * for the stop command.
 972                  */
 973                 if (intmask & SDHCI_INT_DATA_END)
 974                         return;
 975
 976                 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
 977                         "though no data operation was in progress.\n",
 978                         mmc_hostname(host->mmc), (unsigned)intmask);
 979                 sdhci_dumpregs(host);
 980
 981                 return;
 982         }
 983
 984         if (intmask & SDHCI_INT_DATA_TIMEOUT)
 985                 host->data->error = -ETIMEDOUT;
 986         else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
 987                 host->data->error = -EILSEQ;
 988
 989         if (host->data->error)
 990                 sdhci_finish_data(host);
 991         else {
 992                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
 993                         sdhci_transfer_pio(host);
 994
 995                 /*
 996                  * We currently don't do anything fancy with DMA
 997                  * boundaries, but as we can't disable the feature
 998                  * we need to at least restart the transfer.
 999                  */
1000                 if (intmask & SDHCI_INT_DMA_END)
1001                         writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1002                                 host->ioaddr + SDHCI_DMA_ADDRESS);
1003
1004                 if (intmask & SDHCI_INT_DATA_END) {
1005                         if (host->cmd) {
1006                                 /*
1007                                  * Data managed to finish before the
1008                                  * command completed. Make sure we do
1009                                  * things in the proper order.
1010                                  */
1011                                 host->data_early = 1;
1012                         } else {
1013                                 sdhci_finish_data(host);
1014                         }
1015                 }
1016         }
1017 }
1018
1019 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1020 {
1021         irqreturn_t result;
1022         struct sdhci_host* host = dev_id;
1023         u32 intmask;
1024         int cardint = 0;
1025
1026         spin_lock(&host->lock);
1027
1028         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1029
1030         if (!intmask || intmask == 0xffffffff) {
1031                 result = IRQ_NONE;
1032                 goto out;
1033         }
1034
1035         DBG("*** %s got interrupt: 0x%08x\n",
1036                 mmc_hostname(host->mmc), intmask);
1037
1038         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1039                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1040                         host->ioaddr + SDHCI_INT_STATUS);
1041                 tasklet_schedule(&host->card_tasklet);
1042         }
1043
1044         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1045
1046         if (intmask & SDHCI_INT_CMD_MASK) {
1047                 writel(intmask & SDHCI_INT_CMD_MASK,
1048                         host->ioaddr + SDHCI_INT_STATUS);
1049                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1050         }
1051
1052         if (intmask & SDHCI_INT_DATA_MASK) {
1053                 writel(intmask & SDHCI_INT_DATA_MASK,
1054                         host->ioaddr + SDHCI_INT_STATUS);
1055                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1056         }
1057
1058         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1059
1060         intmask &= ~SDHCI_INT_ERROR;
1061
1062         if (intmask & SDHCI_INT_BUS_POWER) {
1063                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1064                         mmc_hostname(host->mmc));
1065                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1066         }
1067
1068         intmask &= ~SDHCI_INT_BUS_POWER;
1069
1070         if (intmask & SDHCI_INT_CARD_INT)
1071                 cardint = 1;
1072
1073         intmask &= ~SDHCI_INT_CARD_INT;
1074
1075         if (intmask) {
1076                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1077                         mmc_hostname(host->mmc), intmask);
1078                 sdhci_dumpregs(host);
1079
1080                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1081         }
1082
1083         result = IRQ_HANDLED;
1084
1085         mmiowb();
1086 out:
1087         spin_unlock(&host->lock);
1088
1089         /*
1090          * We have to delay this as it calls back into the driver.
1091          */
1092         if (cardint)
1093                 mmc_signal_sdio_irq(host->mmc);
1094
1095         return result;
1096 }
1097
1098 /*****************************************************************************\
1099  *                                                                           *
1100  * Suspend/resume                                                            *
1101  *                                                                           *
1102 \*****************************************************************************/
1103
1104 #ifdef CONFIG_PM
1105
1106 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1107 {
1108         int ret;
1109
1110         ret = mmc_suspend_host(host->mmc, state);
1111         if (ret)
1112                 return ret;
1113
1114         free_irq(host->irq, host);
1115
1116         return 0;
1117 }
1118
1119 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1120
1121 int sdhci_resume_host(struct sdhci_host *host)
1122 {
1123         int ret;
1124
1125         if (host->flags & SDHCI_USE_DMA) {
1126                 if (host->ops->enable_dma)
1127                         host->ops->enable_dma(host);
1128         }
1129
1130         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1131                           mmc_hostname(host->mmc), host);
1132         if (ret)
1133                 return ret;
1134
1135         sdhci_init(host);
1136         mmiowb();
1137
1138         ret = mmc_resume_host(host->mmc);
1139         if (ret)
1140                 return ret;
1141
1142         return 0;
1143 }
1144
1145 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1146
1147 #endif /* CONFIG_PM */
1148
1149 /*****************************************************************************\
1150  *                                                                           *
1151  * Device allocation/registration                                            *
1152  *                                                                           *
1153 \*****************************************************************************/
1154
1155 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1156         size_t priv_size)
1157 {
1158         struct mmc_host *mmc;
1159         struct sdhci_host *host;
1160
1161         WARN_ON(dev == NULL);
1162
1163         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1164         if (!mmc)
1165                 return ERR_PTR(-ENOMEM);
1166
1167         host = mmc_priv(mmc);
1168         host->mmc = mmc;
1169
1170         return host;
1171 }
1172
1173 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1174
1175 int sdhci_add_host(struct sdhci_host *host)
1176 {
1177         struct mmc_host *mmc;
1178         unsigned int caps;
1179         unsigned int version;
1180         int ret;
1181
1182         WARN_ON(host == NULL);
1183         if (host == NULL)
1184                 return -EINVAL;
1185
1186         mmc = host->mmc;
1187
1188         if (debug_quirks)
1189                 host->quirks = debug_quirks;
1190
1191         sdhci_reset(host, SDHCI_RESET_ALL);
1192
1193         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1194         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1195         if (version > 1) {
1196                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1197                         "You may experience problems.\n", mmc_hostname(mmc),
1198                         version);
1199         }
1200
1201         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1202
1203         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1204                 host->flags |= SDHCI_USE_DMA;
1205         else if (!(caps & SDHCI_CAN_DO_DMA))
1206                 DBG("Controller doesn't have DMA capability\n");
1207         else
1208                 host->flags |= SDHCI_USE_DMA;
1209
1210         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1211                 (host->flags & SDHCI_USE_DMA)) {
1212                 DBG("Disabling DMA as it is marked broken\n");
1213                 host->flags &= ~SDHCI_USE_DMA;
1214         }
1215
1216         if (host->flags & SDHCI_USE_DMA) {
1217                 if (host->ops->enable_dma) {
1218                         if (host->ops->enable_dma(host)) {
1219                                 printk(KERN_WARNING "%s: No suitable DMA "
1220                                         "available. Falling back to PIO.\n",
1221                                         mmc_hostname(mmc));
1222                                 host->flags &= ~SDHCI_USE_DMA;
1223                         }
1224                 }
1225         }
1226
1227         /* XXX: Hack to get MMC layer to avoid highmem */
1228         if (!(host->flags & SDHCI_USE_DMA))
1229                 mmc_dev(host->mmc)->dma_mask = 0;
1230
1231         host->max_clk =
1232                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1233         if (host->max_clk == 0) {
1234                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1235                         "frequency.\n", mmc_hostname(mmc));
1236                 return -ENODEV;
1237         }
1238         host->max_clk *= 1000000;
1239
1240         host->timeout_clk =
1241                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1242         if (host->timeout_clk == 0) {
1243                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1244                         "frequency.\n", mmc_hostname(mmc));
1245                 return -ENODEV;
1246         }
1247         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1248                 host->timeout_clk *= 1000;
1249
1250         /*
1251          * Set host parameters.
1252          */
1253         mmc->ops = &sdhci_ops;
1254         mmc->f_min = host->max_clk / 256;
1255         mmc->f_max = host->max_clk;
1256         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1257
1258         if (caps & SDHCI_CAN_DO_HISPD)
1259                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1260
1261         mmc->ocr_avail = 0;
1262         if (caps & SDHCI_CAN_VDD_330)
1263                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1264         if (caps & SDHCI_CAN_VDD_300)
1265                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1266         if (caps & SDHCI_CAN_VDD_180)
1267                 mmc->ocr_avail |= MMC_VDD_165_195;
1268
1269         if (mmc->ocr_avail == 0) {
1270                 printk(KERN_ERR "%s: Hardware doesn't report any "
1271                         "support voltages.\n", mmc_hostname(mmc));
1272                 return -ENODEV;
1273         }
1274
1275         spin_lock_init(&host->lock);
1276
1277         /*
1278          * Maximum number of segments. Hardware cannot do scatter lists.
1279          */
1280         if (host->flags & SDHCI_USE_DMA)
1281                 mmc->max_hw_segs = 1;
1282         else
1283                 mmc->max_hw_segs = 16;
1284         mmc->max_phys_segs = 16;
1285
1286         /*
1287          * Maximum number of sectors in one transfer. Limited by DMA boundary
1288          * size (512KiB).
1289          */
1290         mmc->max_req_size = 524288;
1291
1292         /*
1293          * Maximum segment size. Could be one segment with the maximum number
1294          * of bytes.
1295          */
1296         mmc->max_seg_size = mmc->max_req_size;
1297
1298         /*
1299          * Maximum block size. This varies from controller to controller and
1300          * is specified in the capabilities register.
1301          */
1302         mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1303         if (mmc->max_blk_size >= 3) {
1304                 printk(KERN_WARNING "%s: Invalid maximum block size, "
1305                         "assuming 512 bytes\n", mmc_hostname(mmc));
1306                 mmc->max_blk_size = 512;
1307         } else
1308                 mmc->max_blk_size = 512 << mmc->max_blk_size;
1309
1310         /*
1311          * Maximum block count.
1312          */
1313         mmc->max_blk_count = 65535;
1314
1315         /*
1316          * Init tasklets.
1317          */
1318         tasklet_init(&host->card_tasklet,
1319                 sdhci_tasklet_card, (unsigned long)host);
1320         tasklet_init(&host->finish_tasklet,
1321                 sdhci_tasklet_finish, (unsigned long)host);
1322
1323         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1324
1325         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1326                 mmc_hostname(mmc), host);
1327         if (ret)
1328                 goto untasklet;
1329
1330         sdhci_init(host);
1331
1332 #ifdef CONFIG_MMC_DEBUG
1333         sdhci_dumpregs(host);
1334 #endif
1335
1336 #ifdef CONFIG_LEDS_CLASS
1337         host->led.name = mmc_hostname(mmc);
1338         host->led.brightness = LED_OFF;
1339         host->led.default_trigger = mmc_hostname(mmc);
1340         host->led.brightness_set = sdhci_led_control;
1341
1342         ret = led_classdev_register(mmc_dev(mmc), &host->led);
1343         if (ret)
1344                 goto reset;
1345 #endif
1346
1347         mmiowb();
1348
1349         mmc_add_host(mmc);
1350
1351         printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s\n",
1352                 mmc_hostname(mmc), host->hw_name, mmc_dev(mmc)->bus_id,
1353                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1354
1355         return 0;
1356
1357 #ifdef CONFIG_LEDS_CLASS
1358 reset:
1359         sdhci_reset(host, SDHCI_RESET_ALL);
1360         free_irq(host->irq, host);
1361 #endif
1362 untasklet:
1363         tasklet_kill(&host->card_tasklet);
1364         tasklet_kill(&host->finish_tasklet);
1365
1366         return ret;
1367 }
1368
1369 EXPORT_SYMBOL_GPL(sdhci_add_host);
1370
1371 void sdhci_remove_host(struct sdhci_host *host)
1372 {
1373         mmc_remove_host(host->mmc);
1374
1375 #ifdef CONFIG_LEDS_CLASS
1376         led_classdev_unregister(&host->led);
1377 #endif
1378
1379         sdhci_reset(host, SDHCI_RESET_ALL);
1380
1381         free_irq(host->irq, host);
1382
1383         del_timer_sync(&host->timer);
1384
1385         tasklet_kill(&host->card_tasklet);
1386         tasklet_kill(&host->finish_tasklet);
1387 }
1388
1389 EXPORT_SYMBOL_GPL(sdhci_remove_host);
1390
1391 void sdhci_free_host(struct sdhci_host *host)
1392 {
1393         mmc_free_host(host->mmc);
1394 }
1395
1396 EXPORT_SYMBOL_GPL(sdhci_free_host);
1397
1398 /*****************************************************************************\
1399  *                                                                           *
1400  * Driver init/exit                                                          *
1401  *                                                                           *
1402 \*****************************************************************************/
1403
1404 static int __init sdhci_drv_init(void)
1405 {
1406         printk(KERN_INFO DRIVER_NAME
1407                 ": Secure Digital Host Controller Interface driver\n");
1408         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1409
1410         return 0;
1411 }
1412
1413 static void __exit sdhci_drv_exit(void)
1414 {
1415 }
1416
1417 module_init(sdhci_drv_init);
1418 module_exit(sdhci_drv_exit);
1419
1420 module_param(debug_quirks, uint, 0444);
1421
1422 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1423 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
1424 MODULE_LICENSE("GPL");
1425
1426 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");