drivers/mmc/sdhci.c

   1 /*
   2  *  linux/drivers/mmc/sdhci.c - Secure Digital Host Controller Interface driver
   3  *
   4  *  Copyright (C) 2005-2006 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
  12 #include <linux/delay.h>
  13 #include <linux/highmem.h>
  14 #include <linux/pci.h>
  15 #include <linux/dma-mapping.h>
  16
  17 #include <linux/mmc/host.h>
  18 #include <linux/mmc/protocol.h>
  19
  20 #include <asm/scatterlist.h>
  21
  22 #include "sdhci.h"
  23
  24 #define DRIVER_NAME "sdhci"
  25 #define DRIVER_VERSION "0.12"
  26
  27 #define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
  28
  29 #define DBG(f, x...) \
  30         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  31
  32 static unsigned int debug_nodma = 0;
  33 static unsigned int debug_forcedma = 0;
  34 static unsigned int debug_quirks = 0;
  35
  36 #define SDHCI_QUIRK_CLOCK_BEFORE_RESET                  (1<<0)
  37 #define SDHCI_QUIRK_FORCE_DMA                           (1<<1)
  38 /* Controller doesn't like some resets when there is no card inserted. */
  39 #define SDHCI_QUIRK_NO_CARD_NO_RESET                    (1<<2)
  40
  41 static const struct pci_device_id pci_ids[] __devinitdata = {
  42         {
  43                 .vendor         = PCI_VENDOR_ID_RICOH,
  44                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  45                 .subvendor      = PCI_VENDOR_ID_IBM,
  46                 .subdevice      = PCI_ANY_ID,
  47                 .driver_data    = SDHCI_QUIRK_CLOCK_BEFORE_RESET |
  48                                   SDHCI_QUIRK_FORCE_DMA,
  49         },
  50
  51         {
  52                 .vendor         = PCI_VENDOR_ID_RICOH,
  53                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  54                 .subvendor      = PCI_ANY_ID,
  55                 .subdevice      = PCI_ANY_ID,
  56                 .driver_data    = SDHCI_QUIRK_FORCE_DMA |
  57                                   SDHCI_QUIRK_NO_CARD_NO_RESET,
  58         },
  59
  60         {
  61                 .vendor         = PCI_VENDOR_ID_TI,
  62                 .device         = PCI_DEVICE_ID_TI_XX21_XX11_SD,
  63                 .subvendor      = PCI_ANY_ID,
  64                 .subdevice      = PCI_ANY_ID,
  65                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
  66         },
  67
  68         {       /* Generic SD host controller */
  69                 PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
  70         },
  71
  72         { /* end: all zeroes */ },
  73 };
  74
  75 MODULE_DEVICE_TABLE(pci, pci_ids);
  76
  77 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  78 static void sdhci_finish_data(struct sdhci_host *);
  79
  80 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  81 static void sdhci_finish_command(struct sdhci_host *);
  82
  83 static void sdhci_dumpregs(struct sdhci_host *host)
  84 {
  85         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  86
  87         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  88                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
  89                 readw(host->ioaddr + SDHCI_HOST_VERSION));
  90         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  91                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
  92                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
  93         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  94                 readl(host->ioaddr + SDHCI_ARGUMENT),
  95                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
  96         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  97                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
  98                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
  99         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
 100                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
 101                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
 102         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
 103                 readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
 104                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
 105         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
 106                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
 107                 readl(host->ioaddr + SDHCI_INT_STATUS));
 108         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
 109                 readl(host->ioaddr + SDHCI_INT_ENABLE),
 110                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
 111         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
 112                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
 113                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
 114         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
 115                 readl(host->ioaddr + SDHCI_CAPABILITIES),
 116                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
 117
 118         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
 119 }
 120
 121 /*****************************************************************************\
 122  *                                                                           *
 123  * Low level functions                                                       *
 124  *                                                                           *
 125 \*****************************************************************************/
 126
 127 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 128 {
 129         unsigned long timeout;
 130
 131         if (host->chip->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 132                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
 133                         SDHCI_CARD_PRESENT))
 134                         return;
 135         }
 136
 137         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
 138
 139         if (mask & SDHCI_RESET_ALL)
 140                 host->clock = 0;
 141
 142         /* Wait max 100 ms */
 143         timeout = 100;
 144
 145         /* hw clears the bit when it's done */
 146         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
 147                 if (timeout == 0) {
 148                         printk(KERN_ERR "%s: Reset 0x%x never completed. "
 149                                 "Please report this to " BUGMAIL ".\n",
 150                                 mmc_hostname(host->mmc), (int)mask);
 151                         sdhci_dumpregs(host);
 152                         return;
 153                 }
 154                 timeout--;
 155                 mdelay(1);
 156         }
 157 }
 158
 159 static void sdhci_init(struct sdhci_host *host)
 160 {
 161         u32 intmask;
 162
 163         sdhci_reset(host, SDHCI_RESET_ALL);
 164
 165         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 166                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 167                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 168                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
 169                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
 170                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
 171
 172         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 173         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 174 }
 175
 176 static void sdhci_activate_led(struct sdhci_host *host)
 177 {
 178         u8 ctrl;
 179
 180         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 181         ctrl |= SDHCI_CTRL_LED;
 182         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 183 }
 184
 185 static void sdhci_deactivate_led(struct sdhci_host *host)
 186 {
 187         u8 ctrl;
 188
 189         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 190         ctrl &= ~SDHCI_CTRL_LED;
 191         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 192 }
 193
 194 /*****************************************************************************\
 195  *                                                                           *
 196  * Core functions                                                            *
 197  *                                                                           *
 198 \*****************************************************************************/
 199
 200 static inline char* sdhci_kmap_sg(struct sdhci_host* host)
 201 {
 202         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
 203         return host->mapped_sg + host->cur_sg->offset;
 204 }
 205
 206 static inline void sdhci_kunmap_sg(struct sdhci_host* host)
 207 {
 208         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
 209 }
 210
 211 static inline int sdhci_next_sg(struct sdhci_host* host)
 212 {
 213         /*
 214          * Skip to next SG entry.
 215          */
 216         host->cur_sg++;
 217         host->num_sg--;
 218
 219         /*
 220          * Any entries left?
 221          */
 222         if (host->num_sg > 0) {
 223                 host->offset = 0;
 224                 host->remain = host->cur_sg->length;
 225         }
 226
 227         return host->num_sg;
 228 }
 229
 230 static void sdhci_read_block_pio(struct sdhci_host *host)
 231 {
 232         int blksize, chunk_remain;
 233         u32 data;
 234         char *buffer;
 235         int size;
 236
 237         DBG("PIO reading\n");
 238
 239         blksize = host->data->blksz;
 240         chunk_remain = 0;
 241         data = 0;
 242
 243         buffer = sdhci_kmap_sg(host) + host->offset;
 244
 245         while (blksize) {
 246                 if (chunk_remain == 0) {
 247                         data = readl(host->ioaddr + SDHCI_BUFFER);
 248                         chunk_remain = min(blksize, 4);
 249                 }
 250
 251                 size = min(host->size, host->remain);
 252                 size = min(size, chunk_remain);
 253
 254                 chunk_remain -= size;
 255                 blksize -= size;
 256                 host->offset += size;
 257                 host->remain -= size;
 258                 host->size -= size;
 259                 while (size) {
 260                         *buffer = data & 0xFF;
 261                         buffer++;
 262                         data >>= 8;
 263                         size--;
 264                 }
 265
 266                 if (host->remain == 0) {
 267                         sdhci_kunmap_sg(host);
 268                         if (sdhci_next_sg(host) == 0) {
 269                                 BUG_ON(blksize != 0);
 270                                 return;
 271                         }
 272                         buffer = sdhci_kmap_sg(host);
 273                 }
 274         }
 275
 276         sdhci_kunmap_sg(host);
 277 }
 278
 279 static void sdhci_write_block_pio(struct sdhci_host *host)
 280 {
 281         int blksize, chunk_remain;
 282         u32 data;
 283         char *buffer;
 284         int bytes, size;
 285
 286         DBG("PIO writing\n");
 287
 288         blksize = host->data->blksz;
 289         chunk_remain = 4;
 290         data = 0;
 291
 292         bytes = 0;
 293         buffer = sdhci_kmap_sg(host) + host->offset;
 294
 295         while (blksize) {
 296                 size = min(host->size, host->remain);
 297                 size = min(size, chunk_remain);
 298
 299                 chunk_remain -= size;
 300                 blksize -= size;
 301                 host->offset += size;
 302                 host->remain -= size;
 303                 host->size -= size;
 304                 while (size) {
 305                         data >>= 8;
 306                         data |= (u32)*buffer << 24;
 307                         buffer++;
 308                         size--;
 309                 }
 310
 311                 if (chunk_remain == 0) {
 312                         writel(data, host->ioaddr + SDHCI_BUFFER);
 313                         chunk_remain = min(blksize, 4);
 314                 }
 315
 316                 if (host->remain == 0) {
 317                         sdhci_kunmap_sg(host);
 318                         if (sdhci_next_sg(host) == 0) {
 319                                 BUG_ON(blksize != 0);
 320                                 return;
 321                         }
 322                         buffer = sdhci_kmap_sg(host);
 323                 }
 324         }
 325
 326         sdhci_kunmap_sg(host);
 327 }
 328
 329 static void sdhci_transfer_pio(struct sdhci_host *host)
 330 {
 331         u32 mask;
 332
 333         BUG_ON(!host->data);
 334
 335         if (host->size == 0)
 336                 return;
 337
 338         if (host->data->flags & MMC_DATA_READ)
 339                 mask = SDHCI_DATA_AVAILABLE;
 340         else
 341                 mask = SDHCI_SPACE_AVAILABLE;
 342
 343         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 344                 if (host->data->flags & MMC_DATA_READ)
 345                         sdhci_read_block_pio(host);
 346                 else
 347                         sdhci_write_block_pio(host);
 348
 349                 if (host->size == 0)
 350                         break;
 351
 352                 BUG_ON(host->num_sg == 0);
 353         }
 354
 355         DBG("PIO transfer complete.\n");
 356 }
 357
 358 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 359 {
 360         u8 count;
 361         unsigned target_timeout, current_timeout;
 362
 363         WARN_ON(host->data);
 364
 365         if (data == NULL)
 366                 return;
 367
 368         DBG("blksz %04x blks %04x flags %08x\n",
 369                 data->blksz, data->blocks, data->flags);
 370         DBG("tsac %d ms nsac %d clk\n",
 371                 data->timeout_ns / 1000000, data->timeout_clks);
 372
 373         /* Sanity checks */
 374         BUG_ON(data->blksz * data->blocks > 524288);
 375         BUG_ON(data->blksz > host->max_block);
 376         BUG_ON(data->blocks > 65535);
 377
 378         /* timeout in us */
 379         target_timeout = data->timeout_ns / 1000 +
 380                 data->timeout_clks / host->clock;
 381
 382         /*
 383          * Figure out needed cycles.
 384          * We do this in steps in order to fit inside a 32 bit int.
 385          * The first step is the minimum timeout, which will have a
 386          * minimum resolution of 6 bits:
 387          * (1) 2^13*1000 > 2^22,
 388          * (2) host->timeout_clk < 2^16
 389          *     =>
 390          *     (1) / (2) > 2^6
 391          */
 392         count = 0;
 393         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 394         while (current_timeout < target_timeout) {
 395                 count++;
 396                 current_timeout <<= 1;
 397                 if (count >= 0xF)
 398                         break;
 399         }
 400
 401         if (count >= 0xF) {
 402                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 403                         mmc_hostname(host->mmc));
 404                 count = 0xE;
 405         }
 406
 407         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 408
 409         if (host->flags & SDHCI_USE_DMA) {
 410                 int count;
 411
 412                 count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
 413                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 414                 BUG_ON(count != 1);
 415
 416                 writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
 417         } else {
 418                 host->size = data->blksz * data->blocks;
 419
 420                 host->cur_sg = data->sg;
 421                 host->num_sg = data->sg_len;
 422
 423                 host->offset = 0;
 424                 host->remain = host->cur_sg->length;
 425         }
 426
 427         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 428         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 429                 host->ioaddr + SDHCI_BLOCK_SIZE);
 430         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 431 }
 432
 433 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 434         struct mmc_data *data)
 435 {
 436         u16 mode;
 437
 438         WARN_ON(host->data);
 439
 440         if (data == NULL)
 441                 return;
 442
 443         mode = SDHCI_TRNS_BLK_CNT_EN;
 444         if (data->blocks > 1)
 445                 mode |= SDHCI_TRNS_MULTI;
 446         if (data->flags & MMC_DATA_READ)
 447                 mode |= SDHCI_TRNS_READ;
 448         if (host->flags & SDHCI_USE_DMA)
 449                 mode |= SDHCI_TRNS_DMA;
 450
 451         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 452 }
 453
 454 static void sdhci_finish_data(struct sdhci_host *host)
 455 {
 456         struct mmc_data *data;
 457         u16 blocks;
 458
 459         BUG_ON(!host->data);
 460
 461         data = host->data;
 462         host->data = NULL;
 463
 464         if (host->flags & SDHCI_USE_DMA) {
 465                 pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
 466                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 467         }
 468
 469         /*
 470          * Controller doesn't count down when in single block mode.
 471          */
 472         if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
 473                 blocks = 0;
 474         else
 475                 blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
 476         data->bytes_xfered = data->blksz * (data->blocks - blocks);
 477
 478         if ((data->error == MMC_ERR_NONE) && blocks) {
 479                 printk(KERN_ERR "%s: Controller signalled completion even "
 480                         "though there were blocks left. Please report this "
 481                         "to " BUGMAIL ".\n", mmc_hostname(host->mmc));
 482                 data->error = MMC_ERR_FAILED;
 483         } else if (host->size != 0) {
 484                 printk(KERN_ERR "%s: %d bytes were left untransferred. "
 485                         "Please report this to " BUGMAIL ".\n",
 486                         mmc_hostname(host->mmc), host->size);
 487                 data->error = MMC_ERR_FAILED;
 488         }
 489
 490         DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 491
 492         if (data->stop) {
 493                 /*
 494                  * The controller needs a reset of internal state machines
 495                  * upon error conditions.
 496                  */
 497                 if (data->error != MMC_ERR_NONE) {
 498                         sdhci_reset(host, SDHCI_RESET_CMD);
 499                         sdhci_reset(host, SDHCI_RESET_DATA);
 500                 }
 501
 502                 sdhci_send_command(host, data->stop);
 503         } else
 504                 tasklet_schedule(&host->finish_tasklet);
 505 }
 506
 507 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 508 {
 509         int flags;
 510         u32 mask;
 511         unsigned long timeout;
 512
 513         WARN_ON(host->cmd);
 514
 515         DBG("Sending cmd (%x)\n", cmd->opcode);
 516
 517         /* Wait max 10 ms */
 518         timeout = 10;
 519
 520         mask = SDHCI_CMD_INHIBIT;
 521         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 522                 mask |= SDHCI_DATA_INHIBIT;
 523
 524         /* We shouldn't wait for data inihibit for stop commands, even
 525            though they might use busy signaling */
 526         if (host->mrq->data && (cmd == host->mrq->data->stop))
 527                 mask &= ~SDHCI_DATA_INHIBIT;
 528
 529         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 530                 if (timeout == 0) {
 531                         printk(KERN_ERR "%s: Controller never released "
 532                                 "inhibit bit(s). Please report this to "
 533                                 BUGMAIL ".\n", mmc_hostname(host->mmc));
 534                         sdhci_dumpregs(host);
 535                         cmd->error = MMC_ERR_FAILED;
 536                         tasklet_schedule(&host->finish_tasklet);
 537                         return;
 538                 }
 539                 timeout--;
 540                 mdelay(1);
 541         }
 542
 543         mod_timer(&host->timer, jiffies + 10 * HZ);
 544
 545         host->cmd = cmd;
 546
 547         sdhci_prepare_data(host, cmd->data);
 548
 549         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 550
 551         sdhci_set_transfer_mode(host, cmd->data);
 552
 553         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 554                 printk(KERN_ERR "%s: Unsupported response type! "
 555                         "Please report this to " BUGMAIL ".\n",
 556                         mmc_hostname(host->mmc));
 557                 cmd->error = MMC_ERR_INVALID;
 558                 tasklet_schedule(&host->finish_tasklet);
 559                 return;
 560         }
 561
 562         if (!(cmd->flags & MMC_RSP_PRESENT))
 563                 flags = SDHCI_CMD_RESP_NONE;
 564         else if (cmd->flags & MMC_RSP_136)
 565                 flags = SDHCI_CMD_RESP_LONG;
 566         else if (cmd->flags & MMC_RSP_BUSY)
 567                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 568         else
 569                 flags = SDHCI_CMD_RESP_SHORT;
 570
 571         if (cmd->flags & MMC_RSP_CRC)
 572                 flags |= SDHCI_CMD_CRC;
 573         if (cmd->flags & MMC_RSP_OPCODE)
 574                 flags |= SDHCI_CMD_INDEX;
 575         if (cmd->data)
 576                 flags |= SDHCI_CMD_DATA;
 577
 578         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 579                 host->ioaddr + SDHCI_COMMAND);
 580 }
 581
 582 static void sdhci_finish_command(struct sdhci_host *host)
 583 {
 584         int i;
 585
 586         BUG_ON(host->cmd == NULL);
 587
 588         if (host->cmd->flags & MMC_RSP_PRESENT) {
 589                 if (host->cmd->flags & MMC_RSP_136) {
 590                         /* CRC is stripped so we need to do some shifting. */
 591                         for (i = 0;i < 4;i++) {
 592                                 host->cmd->resp[i] = readl(host->ioaddr +
 593                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 594                                 if (i != 3)
 595                                         host->cmd->resp[i] |=
 596                                                 readb(host->ioaddr +
 597                                                 SDHCI_RESPONSE + (3-i)*4-1);
 598                         }
 599                 } else {
 600                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 601                 }
 602         }
 603
 604         host->cmd->error = MMC_ERR_NONE;
 605
 606         DBG("Ending cmd (%x)\n", host->cmd->opcode);
 607
 608         if (host->cmd->data)
 609                 host->data = host->cmd->data;
 610         else
 611                 tasklet_schedule(&host->finish_tasklet);
 612
 613         host->cmd = NULL;
 614 }
 615
 616 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 617 {
 618         int div;
 619         u8 ctrl;
 620         u16 clk;
 621         unsigned long timeout;
 622
 623         if (clock == host->clock)
 624                 return;
 625
 626         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 627
 628         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 629         if (clock > 25000000)
 630                 ctrl |= SDHCI_CTRL_HISPD;
 631         else
 632                 ctrl &= ~SDHCI_CTRL_HISPD;
 633         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 634
 635         if (clock == 0)
 636                 goto out;
 637
 638         for (div = 1;div < 256;div *= 2) {
 639                 if ((host->max_clk / div) <= clock)
 640                         break;
 641         }
 642         div >>= 1;
 643
 644         clk = div << SDHCI_DIVIDER_SHIFT;
 645         clk |= SDHCI_CLOCK_INT_EN;
 646         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 647
 648         /* Wait max 10 ms */
 649         timeout = 10;
 650         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 651                 & SDHCI_CLOCK_INT_STABLE)) {
 652                 if (timeout == 0) {
 653                         printk(KERN_ERR "%s: Internal clock never stabilised. "
 654                                 "Please report this to " BUGMAIL ".\n",
 655                                 mmc_hostname(host->mmc));
 656                         sdhci_dumpregs(host);
 657                         return;
 658                 }
 659                 timeout--;
 660                 mdelay(1);
 661         }
 662
 663         clk |= SDHCI_CLOCK_CARD_EN;
 664         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 665
 666 out:
 667         host->clock = clock;
 668 }
 669
 670 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 671 {
 672         u8 pwr;
 673
 674         if (host->power == power)
 675                 return;
 676
 677         writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 678
 679         if (power == (unsigned short)-1)
 680                 goto out;
 681
 682         pwr = SDHCI_POWER_ON;
 683
 684         switch (power) {
 685         case MMC_VDD_170:
 686         case MMC_VDD_180:
 687         case MMC_VDD_190:
 688                 pwr |= SDHCI_POWER_180;
 689                 break;
 690         case MMC_VDD_290:
 691         case MMC_VDD_300:
 692         case MMC_VDD_310:
 693                 pwr |= SDHCI_POWER_300;
 694                 break;
 695         case MMC_VDD_320:
 696         case MMC_VDD_330:
 697         case MMC_VDD_340:
 698                 pwr |= SDHCI_POWER_330;
 699                 break;
 700         default:
 701                 BUG();
 702         }
 703
 704         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 705
 706 out:
 707         host->power = power;
 708 }
 709
 710 /*****************************************************************************\
 711  *                                                                           *
 712  * MMC callbacks                                                             *
 713  *                                                                           *
 714 \*****************************************************************************/
 715
 716 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 717 {
 718         struct sdhci_host *host;
 719         unsigned long flags;
 720
 721         host = mmc_priv(mmc);
 722
 723         spin_lock_irqsave(&host->lock, flags);
 724
 725         WARN_ON(host->mrq != NULL);
 726
 727         sdhci_activate_led(host);
 728
 729         host->mrq = mrq;
 730
 731         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 732                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 733                 tasklet_schedule(&host->finish_tasklet);
 734         } else
 735                 sdhci_send_command(host, mrq->cmd);
 736
 737         mmiowb();
 738         spin_unlock_irqrestore(&host->lock, flags);
 739 }
 740
 741 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 742 {
 743         struct sdhci_host *host;
 744         unsigned long flags;
 745         u8 ctrl;
 746
 747         host = mmc_priv(mmc);
 748
 749         spin_lock_irqsave(&host->lock, flags);
 750
 751         /*
 752          * Reset the chip on each power off.
 753          * Should clear out any weird states.
 754          */
 755         if (ios->power_mode == MMC_POWER_OFF) {
 756                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 757                 sdhci_init(host);
 758         }
 759
 760         sdhci_set_clock(host, ios->clock);
 761
 762         if (ios->power_mode == MMC_POWER_OFF)
 763                 sdhci_set_power(host, -1);
 764         else
 765                 sdhci_set_power(host, ios->vdd);
 766
 767         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 768         if (ios->bus_width == MMC_BUS_WIDTH_4)
 769                 ctrl |= SDHCI_CTRL_4BITBUS;
 770         else
 771                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 772         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 773
 774         mmiowb();
 775         spin_unlock_irqrestore(&host->lock, flags);
 776 }
 777
 778 static int sdhci_get_ro(struct mmc_host *mmc)
 779 {
 780         struct sdhci_host *host;
 781         unsigned long flags;
 782         int present;
 783
 784         host = mmc_priv(mmc);
 785
 786         spin_lock_irqsave(&host->lock, flags);
 787
 788         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 789
 790         spin_unlock_irqrestore(&host->lock, flags);
 791
 792         return !(present & SDHCI_WRITE_PROTECT);
 793 }
 794
 795 static const struct mmc_host_ops sdhci_ops = {
 796         .request        = sdhci_request,
 797         .set_ios        = sdhci_set_ios,
 798         .get_ro         = sdhci_get_ro,
 799 };
 800
 801 /*****************************************************************************\
 802  *                                                                           *
 803  * Tasklets                                                                  *
 804  *                                                                           *
 805 \*****************************************************************************/
 806
 807 static void sdhci_tasklet_card(unsigned long param)
 808 {
 809         struct sdhci_host *host;
 810         unsigned long flags;
 811
 812         host = (struct sdhci_host*)param;
 813
 814         spin_lock_irqsave(&host->lock, flags);
 815
 816         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 817                 if (host->mrq) {
 818                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 819                                 mmc_hostname(host->mmc));
 820                         printk(KERN_ERR "%s: Resetting controller.\n",
 821                                 mmc_hostname(host->mmc));
 822
 823                         sdhci_reset(host, SDHCI_RESET_CMD);
 824                         sdhci_reset(host, SDHCI_RESET_DATA);
 825
 826                         host->mrq->cmd->error = MMC_ERR_FAILED;
 827                         tasklet_schedule(&host->finish_tasklet);
 828                 }
 829         }
 830
 831         spin_unlock_irqrestore(&host->lock, flags);
 832
 833         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 834 }
 835
 836 static void sdhci_tasklet_finish(unsigned long param)
 837 {
 838         struct sdhci_host *host;
 839         unsigned long flags;
 840         struct mmc_request *mrq;
 841
 842         host = (struct sdhci_host*)param;
 843
 844         spin_lock_irqsave(&host->lock, flags);
 845
 846         del_timer(&host->timer);
 847
 848         mrq = host->mrq;
 849
 850         DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 851
 852         /*
 853          * The controller needs a reset of internal state machines
 854          * upon error conditions.
 855          */
 856         if ((mrq->cmd->error != MMC_ERR_NONE) ||
 857                 (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
 858                 (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
 859
 860                 /* Some controllers need this kick or reset won't work here */
 861                 if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 862                         unsigned int clock;
 863
 864                         /* This is to force an update */
 865                         clock = host->clock;
 866                         host->clock = 0;
 867                         sdhci_set_clock(host, clock);
 868                 }
 869
 870                 /* Spec says we should do both at the same time, but Ricoh
 871                    controllers do not like that. */
 872                 sdhci_reset(host, SDHCI_RESET_CMD);
 873                 sdhci_reset(host, SDHCI_RESET_DATA);
 874         }
 875
 876         host->mrq = NULL;
 877         host->cmd = NULL;
 878         host->data = NULL;
 879
 880         sdhci_deactivate_led(host);
 881
 882         mmiowb();
 883         spin_unlock_irqrestore(&host->lock, flags);
 884
 885         mmc_request_done(host->mmc, mrq);
 886 }
 887
 888 static void sdhci_timeout_timer(unsigned long data)
 889 {
 890         struct sdhci_host *host;
 891         unsigned long flags;
 892
 893         host = (struct sdhci_host*)data;
 894
 895         spin_lock_irqsave(&host->lock, flags);
 896
 897         if (host->mrq) {
 898                 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
 899                         "Please report this to " BUGMAIL ".\n",
 900                         mmc_hostname(host->mmc));
 901                 sdhci_dumpregs(host);
 902
 903                 if (host->data) {
 904                         host->data->error = MMC_ERR_TIMEOUT;
 905                         sdhci_finish_data(host);
 906                 } else {
 907                         if (host->cmd)
 908                                 host->cmd->error = MMC_ERR_TIMEOUT;
 909                         else
 910                                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 911
 912                         tasklet_schedule(&host->finish_tasklet);
 913                 }
 914         }
 915
 916         mmiowb();
 917         spin_unlock_irqrestore(&host->lock, flags);
 918 }
 919
 920 /*****************************************************************************\
 921  *                                                                           *
 922  * Interrupt handling                                                        *
 923  *                                                                           *
 924 \*****************************************************************************/
 925
 926 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 927 {
 928         BUG_ON(intmask == 0);
 929
 930         if (!host->cmd) {
 931                 printk(KERN_ERR "%s: Got command interrupt even though no "
 932                         "command operation was in progress.\n",
 933                         mmc_hostname(host->mmc));
 934                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 935                         mmc_hostname(host->mmc));
 936                 sdhci_dumpregs(host);
 937                 return;
 938         }
 939
 940         if (intmask & SDHCI_INT_RESPONSE)
 941                 sdhci_finish_command(host);
 942         else {
 943                 if (intmask & SDHCI_INT_TIMEOUT)
 944                         host->cmd->error = MMC_ERR_TIMEOUT;
 945                 else if (intmask & SDHCI_INT_CRC)
 946                         host->cmd->error = MMC_ERR_BADCRC;
 947                 else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
 948                         host->cmd->error = MMC_ERR_FAILED;
 949                 else
 950                         host->cmd->error = MMC_ERR_INVALID;
 951
 952                 tasklet_schedule(&host->finish_tasklet);
 953         }
 954 }
 955
 956 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 957 {
 958         BUG_ON(intmask == 0);
 959
 960         if (!host->data) {
 961                 /*
 962                  * A data end interrupt is sent together with the response
 963                  * for the stop command.
 964                  */
 965                 if (intmask & SDHCI_INT_DATA_END)
 966                         return;
 967
 968                 printk(KERN_ERR "%s: Got data interrupt even though no "
 969                         "data operation was in progress.\n",
 970                         mmc_hostname(host->mmc));
 971                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 972                         mmc_hostname(host->mmc));
 973                 sdhci_dumpregs(host);
 974
 975                 return;
 976         }
 977
 978         if (intmask & SDHCI_INT_DATA_TIMEOUT)
 979                 host->data->error = MMC_ERR_TIMEOUT;
 980         else if (intmask & SDHCI_INT_DATA_CRC)
 981                 host->data->error = MMC_ERR_BADCRC;
 982         else if (intmask & SDHCI_INT_DATA_END_BIT)
 983                 host->data->error = MMC_ERR_FAILED;
 984
 985         if (host->data->error != MMC_ERR_NONE)
 986                 sdhci_finish_data(host);
 987         else {
 988                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
 989                         sdhci_transfer_pio(host);
 990
 991                 if (intmask & SDHCI_INT_DATA_END)
 992                         sdhci_finish_data(host);
 993         }
 994 }
 995
 996 static irqreturn_t sdhci_irq(int irq, void *dev_id)
 997 {
 998         irqreturn_t result;
 999         struct sdhci_host* host = dev_id;
1000         u32 intmask;
1001
1002         spin_lock(&host->lock);
1003
1004         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1005
1006         if (!intmask) {
1007                 result = IRQ_NONE;
1008                 goto out;
1009         }
1010
1011         DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
1012
1013         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1014                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1015                         host->ioaddr + SDHCI_INT_STATUS);
1016                 tasklet_schedule(&host->card_tasklet);
1017         }
1018
1019         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1020
1021         if (intmask & SDHCI_INT_CMD_MASK) {
1022                 writel(intmask & SDHCI_INT_CMD_MASK,
1023                         host->ioaddr + SDHCI_INT_STATUS);
1024                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1025         }
1026
1027         if (intmask & SDHCI_INT_DATA_MASK) {
1028                 writel(intmask & SDHCI_INT_DATA_MASK,
1029                         host->ioaddr + SDHCI_INT_STATUS);
1030                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1031         }
1032
1033         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1034
1035         if (intmask & SDHCI_INT_BUS_POWER) {
1036                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1037                         mmc_hostname(host->mmc));
1038                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1039         }
1040
1041         intmask &= SDHCI_INT_BUS_POWER;
1042
1043         if (intmask) {
1044                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x. Please "
1045                         "report this to " BUGMAIL ".\n",
1046                         mmc_hostname(host->mmc), intmask);
1047                 sdhci_dumpregs(host);
1048
1049                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1050         }
1051
1052         result = IRQ_HANDLED;
1053
1054         mmiowb();
1055 out:
1056         spin_unlock(&host->lock);
1057
1058         return result;
1059 }
1060
1061 /*****************************************************************************\
1062  *                                                                           *
1063  * Suspend/resume                                                            *
1064  *                                                                           *
1065 \*****************************************************************************/
1066
1067 #ifdef CONFIG_PM
1068
1069 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
1070 {
1071         struct sdhci_chip *chip;
1072         int i, ret;
1073
1074         chip = pci_get_drvdata(pdev);
1075         if (!chip)
1076                 return 0;
1077
1078         DBG("Suspending...\n");
1079
1080         for (i = 0;i < chip->num_slots;i++) {
1081                 if (!chip->hosts[i])
1082                         continue;
1083                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
1084                 if (ret) {
1085                         for (i--;i >= 0;i--)
1086                                 mmc_resume_host(chip->hosts[i]->mmc);
1087                         return ret;
1088                 }
1089         }
1090
1091         pci_save_state(pdev);
1092         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
1093         pci_disable_device(pdev);
1094         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1095
1096         return 0;
1097 }
1098
1099 static int sdhci_resume (struct pci_dev *pdev)
1100 {
1101         struct sdhci_chip *chip;
1102         int i, ret;
1103
1104         chip = pci_get_drvdata(pdev);
1105         if (!chip)
1106                 return 0;
1107
1108         DBG("Resuming...\n");
1109
1110         pci_set_power_state(pdev, PCI_D0);
1111         pci_restore_state(pdev);
1112         pci_enable_device(pdev);
1113
1114         for (i = 0;i < chip->num_slots;i++) {
1115                 if (!chip->hosts[i])
1116                         continue;
1117                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
1118                         pci_set_master(pdev);
1119                 sdhci_init(chip->hosts[i]);
1120                 mmiowb();
1121                 ret = mmc_resume_host(chip->hosts[i]->mmc);
1122                 if (ret)
1123                         return ret;
1124         }
1125
1126         return 0;
1127 }
1128
1129 #else /* CONFIG_PM */
1130
1131 #define sdhci_suspend NULL
1132 #define sdhci_resume NULL
1133
1134 #endif /* CONFIG_PM */
1135
1136 /*****************************************************************************\
1137  *                                                                           *
1138  * Device probing/removal                                                    *
1139  *                                                                           *
1140 \*****************************************************************************/
1141
1142 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
1143 {
1144         int ret;
1145         unsigned int version;
1146         struct sdhci_chip *chip;
1147         struct mmc_host *mmc;
1148         struct sdhci_host *host;
1149
1150         u8 first_bar;
1151         unsigned int caps;
1152
1153         chip = pci_get_drvdata(pdev);
1154         BUG_ON(!chip);
1155
1156         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
1157         if (ret)
1158                 return ret;
1159
1160         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
1161
1162         if (first_bar > 5) {
1163                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
1164                 return -ENODEV;
1165         }
1166
1167         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
1168                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
1169                 return -ENODEV;
1170         }
1171
1172         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
1173                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. Aborting.\n");
1174                 return -ENODEV;
1175         }
1176
1177         if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
1178                 printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
1179                 return -ENODEV;
1180         }
1181
1182         if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
1183                 printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
1184                 return -ENODEV;
1185         }
1186
1187         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
1188         if (!mmc)
1189                 return -ENOMEM;
1190
1191         host = mmc_priv(mmc);
1192         host->mmc = mmc;
1193
1194         host->chip = chip;
1195         chip->hosts[slot] = host;
1196
1197         host->bar = first_bar + slot;
1198
1199         host->addr = pci_resource_start(pdev, host->bar);
1200         host->irq = pdev->irq;
1201
1202         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1203
1204         snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
1205
1206         ret = pci_request_region(pdev, host->bar, host->slot_descr);
1207         if (ret)
1208                 goto free;
1209
1210         host->ioaddr = ioremap_nocache(host->addr,
1211                 pci_resource_len(pdev, host->bar));
1212         if (!host->ioaddr) {
1213                 ret = -ENOMEM;
1214                 goto release;
1215         }
1216
1217         sdhci_reset(host, SDHCI_RESET_ALL);
1218
1219         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1220         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1221         if (version != 0) {
1222                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1223                         "You may experience problems.\n", host->slot_descr,
1224                         version);
1225         }
1226
1227         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1228
1229         if (debug_nodma)
1230                 DBG("DMA forced off\n");
1231         else if (debug_forcedma) {
1232                 DBG("DMA forced on\n");
1233                 host->flags |= SDHCI_USE_DMA;
1234         } else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
1235                 host->flags |= SDHCI_USE_DMA;
1236         else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
1237                 DBG("Controller doesn't have DMA interface\n");
1238         else if (!(caps & SDHCI_CAN_DO_DMA))
1239                 DBG("Controller doesn't have DMA capability\n");
1240         else
1241                 host->flags |= SDHCI_USE_DMA;
1242
1243         if (host->flags & SDHCI_USE_DMA) {
1244                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1245                         printk(KERN_WARNING "%s: No suitable DMA available. "
1246                                 "Falling back to PIO.\n", host->slot_descr);
1247                         host->flags &= ~SDHCI_USE_DMA;
1248                 }
1249         }
1250
1251         if (host->flags & SDHCI_USE_DMA)
1252                 pci_set_master(pdev);
1253         else /* XXX: Hack to get MMC layer to avoid highmem */
1254                 pdev->dma_mask = 0;
1255
1256         host->max_clk =
1257                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1258         if (host->max_clk == 0) {
1259                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1260                         "frequency.\n", host->slot_descr);
1261                 ret = -ENODEV;
1262                 goto unmap;
1263         }
1264         host->max_clk *= 1000000;
1265
1266         host->timeout_clk =
1267                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1268         if (host->timeout_clk == 0) {
1269                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1270                         "frequency.\n", host->slot_descr);
1271                 ret = -ENODEV;
1272                 goto unmap;
1273         }
1274         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1275                 host->timeout_clk *= 1000;
1276
1277         host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1278         if (host->max_block >= 3) {
1279                 printk(KERN_ERR "%s: Invalid maximum block size.\n",
1280                         host->slot_descr);
1281                 ret = -ENODEV;
1282                 goto unmap;
1283         }
1284         host->max_block = 512 << host->max_block;
1285
1286         /*
1287          * Set host parameters.
1288          */
1289         mmc->ops = &sdhci_ops;
1290         mmc->f_min = host->max_clk / 256;
1291         mmc->f_max = host->max_clk;
1292         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1293
1294         mmc->ocr_avail = 0;
1295         if (caps & SDHCI_CAN_VDD_330)
1296                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1297         else if (caps & SDHCI_CAN_VDD_300)
1298                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1299         else if (caps & SDHCI_CAN_VDD_180)
1300                 mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
1301
1302         if ((host->max_clk > 25000000) && !(caps & SDHCI_CAN_DO_HISPD)) {
1303                 printk(KERN_ERR "%s: Controller reports > 25 MHz base clock,"
1304                         " but no high speed support.\n",
1305                         host->slot_descr);
1306                 mmc->f_max = 25000000;
1307         }
1308
1309         if (mmc->ocr_avail == 0) {
1310                 printk(KERN_ERR "%s: Hardware doesn't report any "
1311                         "support voltages.\n", host->slot_descr);
1312                 ret = -ENODEV;
1313                 goto unmap;
1314         }
1315
1316         spin_lock_init(&host->lock);
1317
1318         /*
1319          * Maximum number of segments. Hardware cannot do scatter lists.
1320          */
1321         if (host->flags & SDHCI_USE_DMA)
1322                 mmc->max_hw_segs = 1;
1323         else
1324                 mmc->max_hw_segs = 16;
1325         mmc->max_phys_segs = 16;
1326
1327         /*
1328          * Maximum number of sectors in one transfer. Limited by DMA boundary
1329          * size (512KiB), which means (512 KiB/512=) 1024 entries.
1330          */
1331         mmc->max_sectors = 1024;
1332
1333         /*
1334          * Maximum segment size. Could be one segment with the maximum number
1335          * of sectors.
1336          */
1337         mmc->max_seg_size = mmc->max_sectors * 512;
1338
1339         /*
1340          * Init tasklets.
1341          */
1342         tasklet_init(&host->card_tasklet,
1343                 sdhci_tasklet_card, (unsigned long)host);
1344         tasklet_init(&host->finish_tasklet,
1345                 sdhci_tasklet_finish, (unsigned long)host);
1346
1347         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1348
1349         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1350                 host->slot_descr, host);
1351         if (ret)
1352                 goto untasklet;
1353
1354         sdhci_init(host);
1355
1356 #ifdef CONFIG_MMC_DEBUG
1357         sdhci_dumpregs(host);
1358 #endif
1359
1360         mmiowb();
1361
1362         mmc_add_host(mmc);
1363
1364         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
1365                 host->addr, host->irq,
1366                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1367
1368         return 0;
1369
1370 untasklet:
1371         tasklet_kill(&host->card_tasklet);
1372         tasklet_kill(&host->finish_tasklet);
1373 unmap:
1374         iounmap(host->ioaddr);
1375 release:
1376         pci_release_region(pdev, host->bar);
1377 free:
1378         mmc_free_host(mmc);
1379
1380         return ret;
1381 }
1382
1383 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1384 {
1385         struct sdhci_chip *chip;
1386         struct mmc_host *mmc;
1387         struct sdhci_host *host;
1388
1389         chip = pci_get_drvdata(pdev);
1390         host = chip->hosts[slot];
1391         mmc = host->mmc;
1392
1393         chip->hosts[slot] = NULL;
1394
1395         mmc_remove_host(mmc);
1396
1397         sdhci_reset(host, SDHCI_RESET_ALL);
1398
1399         free_irq(host->irq, host);
1400
1401         del_timer_sync(&host->timer);
1402
1403         tasklet_kill(&host->card_tasklet);
1404         tasklet_kill(&host->finish_tasklet);
1405
1406         iounmap(host->ioaddr);
1407
1408         pci_release_region(pdev, host->bar);
1409
1410         mmc_free_host(mmc);
1411 }
1412
1413 static int __devinit sdhci_probe(struct pci_dev *pdev,
1414         const struct pci_device_id *ent)
1415 {
1416         int ret, i;
1417         u8 slots, rev;
1418         struct sdhci_chip *chip;
1419
1420         BUG_ON(pdev == NULL);
1421         BUG_ON(ent == NULL);
1422
1423         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
1424
1425         printk(KERN_INFO DRIVER_NAME
1426                 ": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
1427                 pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
1428                 (int)rev);
1429
1430         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1431         if (ret)
1432                 return ret;
1433
1434         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1435         DBG("found %d slot(s)\n", slots);
1436         if (slots == 0)
1437                 return -ENODEV;
1438
1439         ret = pci_enable_device(pdev);
1440         if (ret)
1441                 return ret;
1442
1443         chip = kzalloc(sizeof(struct sdhci_chip) +
1444                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1445         if (!chip) {
1446                 ret = -ENOMEM;
1447                 goto err;
1448         }
1449
1450         chip->pdev = pdev;
1451         chip->quirks = ent->driver_data;
1452
1453         if (debug_quirks)
1454                 chip->quirks = debug_quirks;
1455
1456         chip->num_slots = slots;
1457         pci_set_drvdata(pdev, chip);
1458
1459         for (i = 0;i < slots;i++) {
1460                 ret = sdhci_probe_slot(pdev, i);
1461                 if (ret) {
1462                         for (i--;i >= 0;i--)
1463                                 sdhci_remove_slot(pdev, i);
1464                         goto free;
1465                 }
1466         }
1467
1468         return 0;
1469
1470 free:
1471         pci_set_drvdata(pdev, NULL);
1472         kfree(chip);
1473
1474 err:
1475         pci_disable_device(pdev);
1476         return ret;
1477 }
1478
1479 static void __devexit sdhci_remove(struct pci_dev *pdev)
1480 {
1481         int i;
1482         struct sdhci_chip *chip;
1483
1484         chip = pci_get_drvdata(pdev);
1485
1486         if (chip) {
1487                 for (i = 0;i < chip->num_slots;i++)
1488                         sdhci_remove_slot(pdev, i);
1489
1490                 pci_set_drvdata(pdev, NULL);
1491
1492                 kfree(chip);
1493         }
1494
1495         pci_disable_device(pdev);
1496 }
1497
1498 static struct pci_driver sdhci_driver = {
1499         .name =         DRIVER_NAME,
1500         .id_table =     pci_ids,
1501         .probe =        sdhci_probe,
1502         .remove =       __devexit_p(sdhci_remove),
1503         .suspend =      sdhci_suspend,
1504         .resume =       sdhci_resume,
1505 };
1506
1507 /*****************************************************************************\
1508  *                                                                           *
1509  * Driver init/exit                                                          *
1510  *                                                                           *
1511 \*****************************************************************************/
1512
1513 static int __init sdhci_drv_init(void)
1514 {
1515         printk(KERN_INFO DRIVER_NAME
1516                 ": Secure Digital Host Controller Interface driver, "
1517                 DRIVER_VERSION "\n");
1518         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1519
1520         return pci_register_driver(&sdhci_driver);
1521 }
1522
1523 static void __exit sdhci_drv_exit(void)
1524 {
1525         DBG("Exiting\n");
1526
1527         pci_unregister_driver(&sdhci_driver);
1528 }
1529
1530 module_init(sdhci_drv_init);
1531 module_exit(sdhci_drv_exit);
1532
1533 module_param(debug_nodma, uint, 0444);
1534 module_param(debug_forcedma, uint, 0444);
1535 module_param(debug_quirks, uint, 0444);
1536
1537 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1538 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1539 MODULE_VERSION(DRIVER_VERSION);
1540 MODULE_LICENSE("GPL");
1541
1542 MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
1543 MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
1544 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");