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 version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/highmem.h>
  13 #include <linux/pci.h>
  14 #include <linux/dma-mapping.h>
  15
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/protocol.h>
  18
  19 #include <asm/scatterlist.h>
  20
  21 #include "sdhci.h"
  22
  23 #define DRIVER_NAME "sdhci"
  24 #define DRIVER_VERSION "0.12"
  25
  26 #define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
  27
  28 #define DBG(f, x...) \
  29         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  30
  31 static unsigned int debug_nodma = 0;
  32 static unsigned int debug_forcedma = 0;
  33 static unsigned int debug_quirks = 0;
  34
  35 #define SDHCI_QUIRK_CLOCK_BEFORE_RESET                  (1<<0)
  36 #define SDHCI_QUIRK_FORCE_DMA                           (1<<1)
  37
  38 static const struct pci_device_id pci_ids[] __devinitdata = {
  39         {
  40                 .vendor         = PCI_VENDOR_ID_RICOH,
  41                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  42                 .subvendor      = PCI_VENDOR_ID_IBM,
  43                 .subdevice      = PCI_ANY_ID,
  44                 .driver_data    = SDHCI_QUIRK_CLOCK_BEFORE_RESET |
  45                                   SDHCI_QUIRK_FORCE_DMA,
  46         },
  47
  48         {
  49                 .vendor         = PCI_VENDOR_ID_RICOH,
  50                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  51                 .subvendor      = PCI_ANY_ID,
  52                 .subdevice      = PCI_ANY_ID,
  53                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
  54         },
  55
  56         {
  57                 .vendor         = PCI_VENDOR_ID_TI,
  58                 .device         = PCI_DEVICE_ID_TI_XX21_XX11_SD,
  59                 .subvendor      = PCI_ANY_ID,
  60                 .subdevice      = PCI_ANY_ID,
  61                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
  62         },
  63
  64         {       /* Generic SD host controller */
  65                 PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
  66         },
  67
  68         { /* end: all zeroes */ },
  69 };
  70
  71 MODULE_DEVICE_TABLE(pci, pci_ids);
  72
  73 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  74 static void sdhci_finish_data(struct sdhci_host *);
  75
  76 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  77 static void sdhci_finish_command(struct sdhci_host *);
  78
  79 static void sdhci_dumpregs(struct sdhci_host *host)
  80 {
  81         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  82
  83         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  84                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
  85                 readw(host->ioaddr + SDHCI_HOST_VERSION));
  86         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  87                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
  88                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
  89         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  90                 readl(host->ioaddr + SDHCI_ARGUMENT),
  91                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
  92         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  93                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
  94                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
  95         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  96                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
  97                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
  98         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  99                 readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
 100                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
 101         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
 102                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
 103                 readl(host->ioaddr + SDHCI_INT_STATUS));
 104         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
 105                 readl(host->ioaddr + SDHCI_INT_ENABLE),
 106                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
 107         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
 108                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
 109                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
 110         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
 111                 readl(host->ioaddr + SDHCI_CAPABILITIES),
 112                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
 113
 114         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
 115 }
 116
 117 /*****************************************************************************\
 118  *                                                                           *
 119  * Low level functions                                                       *
 120  *                                                                           *
 121 \*****************************************************************************/
 122
 123 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 124 {
 125         unsigned long timeout;
 126
 127         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
 128
 129         if (mask & SDHCI_RESET_ALL)
 130                 host->clock = 0;
 131
 132         /* Wait max 100 ms */
 133         timeout = 100;
 134
 135         /* hw clears the bit when it's done */
 136         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
 137                 if (timeout == 0) {
 138                         printk(KERN_ERR "%s: Reset 0x%x never completed. "
 139                                 "Please report this to " BUGMAIL ".\n",
 140                                 mmc_hostname(host->mmc), (int)mask);
 141                         sdhci_dumpregs(host);
 142                         return;
 143                 }
 144                 timeout--;
 145                 mdelay(1);
 146         }
 147 }
 148
 149 static void sdhci_init(struct sdhci_host *host)
 150 {
 151         u32 intmask;
 152
 153         sdhci_reset(host, SDHCI_RESET_ALL);
 154
 155         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 156                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 157                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 158                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
 159                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
 160                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
 161
 162         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 163         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 164 }
 165
 166 static void sdhci_activate_led(struct sdhci_host *host)
 167 {
 168         u8 ctrl;
 169
 170         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 171         ctrl |= SDHCI_CTRL_LED;
 172         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 173 }
 174
 175 static void sdhci_deactivate_led(struct sdhci_host *host)
 176 {
 177         u8 ctrl;
 178
 179         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 180         ctrl &= ~SDHCI_CTRL_LED;
 181         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 182 }
 183
 184 /*****************************************************************************\
 185  *                                                                           *
 186  * Core functions                                                            *
 187  *                                                                           *
 188 \*****************************************************************************/
 189
 190 static inline char* sdhci_kmap_sg(struct sdhci_host* host)
 191 {
 192         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
 193         return host->mapped_sg + host->cur_sg->offset;
 194 }
 195
 196 static inline void sdhci_kunmap_sg(struct sdhci_host* host)
 197 {
 198         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
 199 }
 200
 201 static inline int sdhci_next_sg(struct sdhci_host* host)
 202 {
 203         /*
 204          * Skip to next SG entry.
 205          */
 206         host->cur_sg++;
 207         host->num_sg--;
 208
 209         /*
 210          * Any entries left?
 211          */
 212         if (host->num_sg > 0) {
 213                 host->offset = 0;
 214                 host->remain = host->cur_sg->length;
 215         }
 216
 217         return host->num_sg;
 218 }
 219
 220 static void sdhci_read_block_pio(struct sdhci_host *host)
 221 {
 222         int blksize, chunk_remain;
 223         u32 data;
 224         char *buffer;
 225         int size;
 226
 227         DBG("PIO reading\n");
 228
 229         blksize = host->data->blksz;
 230         chunk_remain = 0;
 231         data = 0;
 232
 233         buffer = sdhci_kmap_sg(host) + host->offset;
 234
 235         while (blksize) {
 236                 if (chunk_remain == 0) {
 237                         data = readl(host->ioaddr + SDHCI_BUFFER);
 238                         chunk_remain = min(blksize, 4);
 239                 }
 240
 241                 size = min(host->size, host->remain);
 242                 size = min(size, chunk_remain);
 243
 244                 chunk_remain -= size;
 245                 blksize -= size;
 246                 host->offset += size;
 247                 host->remain -= size;
 248                 host->size -= size;
 249                 while (size) {
 250                         *buffer = data & 0xFF;
 251                         buffer++;
 252                         data >>= 8;
 253                         size--;
 254                 }
 255
 256                 if (host->remain == 0) {
 257                         sdhci_kunmap_sg(host);
 258                         if (sdhci_next_sg(host) == 0) {
 259                                 BUG_ON(blksize != 0);
 260                                 return;
 261                         }
 262                         buffer = sdhci_kmap_sg(host);
 263                 }
 264         }
 265
 266         sdhci_kunmap_sg(host);
 267 }
 268
 269 static void sdhci_write_block_pio(struct sdhci_host *host)
 270 {
 271         int blksize, chunk_remain;
 272         u32 data;
 273         char *buffer;
 274         int bytes, size;
 275
 276         DBG("PIO writing\n");
 277
 278         blksize = host->data->blksz;
 279         chunk_remain = 4;
 280         data = 0;
 281
 282         bytes = 0;
 283         buffer = sdhci_kmap_sg(host) + host->offset;
 284
 285         while (blksize) {
 286                 size = min(host->size, host->remain);
 287                 size = min(size, chunk_remain);
 288
 289                 chunk_remain -= size;
 290                 blksize -= size;
 291                 host->offset += size;
 292                 host->remain -= size;
 293                 host->size -= size;
 294                 while (size) {
 295                         data >>= 8;
 296                         data |= (u32)*buffer << 24;
 297                         buffer++;
 298                         size--;
 299                 }
 300
 301                 if (chunk_remain == 0) {
 302                         writel(data, host->ioaddr + SDHCI_BUFFER);
 303                         chunk_remain = min(blksize, 4);
 304                 }
 305
 306                 if (host->remain == 0) {
 307                         sdhci_kunmap_sg(host);
 308                         if (sdhci_next_sg(host) == 0) {
 309                                 BUG_ON(blksize != 0);
 310                                 return;
 311                         }
 312                         buffer = sdhci_kmap_sg(host);
 313                 }
 314         }
 315
 316         sdhci_kunmap_sg(host);
 317 }
 318
 319 static void sdhci_transfer_pio(struct sdhci_host *host)
 320 {
 321         u32 mask;
 322
 323         BUG_ON(!host->data);
 324
 325         if (host->size == 0)
 326                 return;
 327
 328         if (host->data->flags & MMC_DATA_READ)
 329                 mask = SDHCI_DATA_AVAILABLE;
 330         else
 331                 mask = SDHCI_SPACE_AVAILABLE;
 332
 333         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 334                 if (host->data->flags & MMC_DATA_READ)
 335                         sdhci_read_block_pio(host);
 336                 else
 337                         sdhci_write_block_pio(host);
 338
 339                 if (host->size == 0)
 340                         break;
 341
 342                 BUG_ON(host->num_sg == 0);
 343         }
 344
 345         DBG("PIO transfer complete.\n");
 346 }
 347
 348 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 349 {
 350         u8 count;
 351         unsigned target_timeout, current_timeout;
 352
 353         WARN_ON(host->data);
 354
 355         if (data == NULL)
 356                 return;
 357
 358         DBG("blksz %04x blks %04x flags %08x\n",
 359                 data->blksz, data->blocks, data->flags);
 360         DBG("tsac %d ms nsac %d clk\n",
 361                 data->timeout_ns / 1000000, data->timeout_clks);
 362
 363         /* Sanity checks */
 364         BUG_ON(data->blksz * data->blocks > 524288);
 365         BUG_ON(data->blksz > host->max_block);
 366         BUG_ON(data->blocks > 65535);
 367
 368         /* timeout in us */
 369         target_timeout = data->timeout_ns / 1000 +
 370                 data->timeout_clks / host->clock;
 371
 372         /*
 373          * Figure out needed cycles.
 374          * We do this in steps in order to fit inside a 32 bit int.
 375          * The first step is the minimum timeout, which will have a
 376          * minimum resolution of 6 bits:
 377          * (1) 2^13*1000 > 2^22,
 378          * (2) host->timeout_clk < 2^16
 379          *     =>
 380          *     (1) / (2) > 2^6
 381          */
 382         count = 0;
 383         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 384         while (current_timeout < target_timeout) {
 385                 count++;
 386                 current_timeout <<= 1;
 387                 if (count >= 0xF)
 388                         break;
 389         }
 390
 391         if (count >= 0xF) {
 392                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 393                         mmc_hostname(host->mmc));
 394                 count = 0xE;
 395         }
 396
 397         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 398
 399         if (host->flags & SDHCI_USE_DMA) {
 400                 int count;
 401
 402                 count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
 403                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 404                 BUG_ON(count != 1);
 405
 406                 writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
 407         } else {
 408                 host->size = data->blksz * data->blocks;
 409
 410                 host->cur_sg = data->sg;
 411                 host->num_sg = data->sg_len;
 412
 413                 host->offset = 0;
 414                 host->remain = host->cur_sg->length;
 415         }
 416
 417         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 418         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 419                 host->ioaddr + SDHCI_BLOCK_SIZE);
 420         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 421 }
 422
 423 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 424         struct mmc_data *data)
 425 {
 426         u16 mode;
 427
 428         WARN_ON(host->data);
 429
 430         if (data == NULL)
 431                 return;
 432
 433         mode = SDHCI_TRNS_BLK_CNT_EN;
 434         if (data->blocks > 1)
 435                 mode |= SDHCI_TRNS_MULTI;
 436         if (data->flags & MMC_DATA_READ)
 437                 mode |= SDHCI_TRNS_READ;
 438         if (host->flags & SDHCI_USE_DMA)
 439                 mode |= SDHCI_TRNS_DMA;
 440
 441         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 442 }
 443
 444 static void sdhci_finish_data(struct sdhci_host *host)
 445 {
 446         struct mmc_data *data;
 447         u16 blocks;
 448
 449         BUG_ON(!host->data);
 450
 451         data = host->data;
 452         host->data = NULL;
 453
 454         if (host->flags & SDHCI_USE_DMA) {
 455                 pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
 456                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 457         }
 458
 459         /*
 460          * Controller doesn't count down when in single block mode.
 461          */
 462         if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
 463                 blocks = 0;
 464         else
 465                 blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
 466         data->bytes_xfered = data->blksz * (data->blocks - blocks);
 467
 468         if ((data->error == MMC_ERR_NONE) && blocks) {
 469                 printk(KERN_ERR "%s: Controller signalled completion even "
 470                         "though there were blocks left. Please report this "
 471                         "to " BUGMAIL ".\n", mmc_hostname(host->mmc));
 472                 data->error = MMC_ERR_FAILED;
 473         }
 474
 475         if (host->size != 0) {
 476                 printk(KERN_ERR "%s: %d bytes were left untransferred. "
 477                         "Please report this to " BUGMAIL ".\n",
 478                         mmc_hostname(host->mmc), host->size);
 479                 data->error = MMC_ERR_FAILED;
 480         }
 481
 482         DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 483
 484         if (data->stop) {
 485                 /*
 486                  * The controller needs a reset of internal state machines
 487                  * upon error conditions.
 488                  */
 489                 if (data->error != MMC_ERR_NONE) {
 490                         sdhci_reset(host, SDHCI_RESET_CMD);
 491                         sdhci_reset(host, SDHCI_RESET_DATA);
 492                 }
 493
 494                 sdhci_send_command(host, data->stop);
 495         } else
 496                 tasklet_schedule(&host->finish_tasklet);
 497 }
 498
 499 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 500 {
 501         int flags;
 502         u32 mask;
 503         unsigned long timeout;
 504
 505         WARN_ON(host->cmd);
 506
 507         DBG("Sending cmd (%x)\n", cmd->opcode);
 508
 509         /* Wait max 10 ms */
 510         timeout = 10;
 511
 512         mask = SDHCI_CMD_INHIBIT;
 513         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 514                 mask |= SDHCI_DATA_INHIBIT;
 515
 516         /* We shouldn't wait for data inihibit for stop commands, even
 517            though they might use busy signaling */
 518         if (host->mrq->data && (cmd == host->mrq->data->stop))
 519                 mask &= ~SDHCI_DATA_INHIBIT;
 520
 521         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 522                 if (timeout == 0) {
 523                         printk(KERN_ERR "%s: Controller never released "
 524                                 "inhibit bit(s). Please report this to "
 525                                 BUGMAIL ".\n", mmc_hostname(host->mmc));
 526                         sdhci_dumpregs(host);
 527                         cmd->error = MMC_ERR_FAILED;
 528                         tasklet_schedule(&host->finish_tasklet);
 529                         return;
 530                 }
 531                 timeout--;
 532                 mdelay(1);
 533         }
 534
 535         mod_timer(&host->timer, jiffies + 10 * HZ);
 536
 537         host->cmd = cmd;
 538
 539         sdhci_prepare_data(host, cmd->data);
 540
 541         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 542
 543         sdhci_set_transfer_mode(host, cmd->data);
 544
 545         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 546                 printk(KERN_ERR "%s: Unsupported response type! "
 547                         "Please report this to " BUGMAIL ".\n",
 548                         mmc_hostname(host->mmc));
 549                 cmd->error = MMC_ERR_INVALID;
 550                 tasklet_schedule(&host->finish_tasklet);
 551                 return;
 552         }
 553
 554         if (!(cmd->flags & MMC_RSP_PRESENT))
 555                 flags = SDHCI_CMD_RESP_NONE;
 556         else if (cmd->flags & MMC_RSP_136)
 557                 flags = SDHCI_CMD_RESP_LONG;
 558         else if (cmd->flags & MMC_RSP_BUSY)
 559                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 560         else
 561                 flags = SDHCI_CMD_RESP_SHORT;
 562
 563         if (cmd->flags & MMC_RSP_CRC)
 564                 flags |= SDHCI_CMD_CRC;
 565         if (cmd->flags & MMC_RSP_OPCODE)
 566                 flags |= SDHCI_CMD_INDEX;
 567         if (cmd->data)
 568                 flags |= SDHCI_CMD_DATA;
 569
 570         writel(SDHCI_MAKE_CMD(cmd->opcode, flags),
 571                 host->ioaddr + SDHCI_COMMAND);
 572 }
 573
 574 static void sdhci_finish_command(struct sdhci_host *host)
 575 {
 576         int i;
 577
 578         BUG_ON(host->cmd == NULL);
 579
 580         if (host->cmd->flags & MMC_RSP_PRESENT) {
 581                 if (host->cmd->flags & MMC_RSP_136) {
 582                         /* CRC is stripped so we need to do some shifting. */
 583                         for (i = 0;i < 4;i++) {
 584                                 host->cmd->resp[i] = readl(host->ioaddr +
 585                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 586                                 if (i != 3)
 587                                         host->cmd->resp[i] |=
 588                                                 readb(host->ioaddr +
 589                                                 SDHCI_RESPONSE + (3-i)*4-1);
 590                         }
 591                 } else {
 592                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 593                 }
 594         }
 595
 596         host->cmd->error = MMC_ERR_NONE;
 597
 598         DBG("Ending cmd (%x)\n", host->cmd->opcode);
 599
 600         if (host->cmd->data)
 601                 host->data = host->cmd->data;
 602         else
 603                 tasklet_schedule(&host->finish_tasklet);
 604
 605         host->cmd = NULL;
 606 }
 607
 608 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 609 {
 610         int div;
 611         u16 clk;
 612         unsigned long timeout;
 613
 614         if (clock == host->clock)
 615                 return;
 616
 617         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 618
 619         if (clock == 0)
 620                 goto out;
 621
 622         for (div = 1;div < 256;div *= 2) {
 623                 if ((host->max_clk / div) <= clock)
 624                         break;
 625         }
 626         div >>= 1;
 627
 628         clk = div << SDHCI_DIVIDER_SHIFT;
 629         clk |= SDHCI_CLOCK_INT_EN;
 630         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 631
 632         /* Wait max 10 ms */
 633         timeout = 10;
 634         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 635                 & SDHCI_CLOCK_INT_STABLE)) {
 636                 if (timeout == 0) {
 637                         printk(KERN_ERR "%s: Internal clock never stabilised. "
 638                                 "Please report this to " BUGMAIL ".\n",
 639                                 mmc_hostname(host->mmc));
 640                         sdhci_dumpregs(host);
 641                         return;
 642                 }
 643                 timeout--;
 644                 mdelay(1);
 645         }
 646
 647         clk |= SDHCI_CLOCK_CARD_EN;
 648         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 649
 650 out:
 651         host->clock = clock;
 652 }
 653
 654 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 655 {
 656         u8 pwr;
 657
 658         if (host->power == power)
 659                 return;
 660
 661         writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 662
 663         if (power == (unsigned short)-1)
 664                 goto out;
 665
 666         pwr = SDHCI_POWER_ON;
 667
 668         switch (power) {
 669         case MMC_VDD_170:
 670         case MMC_VDD_180:
 671         case MMC_VDD_190:
 672                 pwr |= SDHCI_POWER_180;
 673                 break;
 674         case MMC_VDD_290:
 675         case MMC_VDD_300:
 676         case MMC_VDD_310:
 677                 pwr |= SDHCI_POWER_300;
 678                 break;
 679         case MMC_VDD_320:
 680         case MMC_VDD_330:
 681         case MMC_VDD_340:
 682                 pwr |= SDHCI_POWER_330;
 683                 break;
 684         default:
 685                 BUG();
 686         }
 687
 688         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 689
 690 out:
 691         host->power = power;
 692 }
 693
 694 /*****************************************************************************\
 695  *                                                                           *
 696  * MMC callbacks                                                             *
 697  *                                                                           *
 698 \*****************************************************************************/
 699
 700 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 701 {
 702         struct sdhci_host *host;
 703         unsigned long flags;
 704
 705         host = mmc_priv(mmc);
 706
 707         spin_lock_irqsave(&host->lock, flags);
 708
 709         WARN_ON(host->mrq != NULL);
 710
 711         sdhci_activate_led(host);
 712
 713         host->mrq = mrq;
 714
 715         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 716                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 717                 tasklet_schedule(&host->finish_tasklet);
 718         } else
 719                 sdhci_send_command(host, mrq->cmd);
 720
 721         spin_unlock_irqrestore(&host->lock, flags);
 722 }
 723
 724 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 725 {
 726         struct sdhci_host *host;
 727         unsigned long flags;
 728         u8 ctrl;
 729
 730         host = mmc_priv(mmc);
 731
 732         spin_lock_irqsave(&host->lock, flags);
 733
 734         /*
 735          * Reset the chip on each power off.
 736          * Should clear out any weird states.
 737          */
 738         if (ios->power_mode == MMC_POWER_OFF) {
 739                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 740                 sdhci_init(host);
 741         }
 742
 743         sdhci_set_clock(host, ios->clock);
 744
 745         if (ios->power_mode == MMC_POWER_OFF)
 746                 sdhci_set_power(host, -1);
 747         else
 748                 sdhci_set_power(host, ios->vdd);
 749
 750         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 751         if (ios->bus_width == MMC_BUS_WIDTH_4)
 752                 ctrl |= SDHCI_CTRL_4BITBUS;
 753         else
 754                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 755         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 756
 757         spin_unlock_irqrestore(&host->lock, flags);
 758 }
 759
 760 static int sdhci_get_ro(struct mmc_host *mmc)
 761 {
 762         struct sdhci_host *host;
 763         unsigned long flags;
 764         int present;
 765
 766         host = mmc_priv(mmc);
 767
 768         spin_lock_irqsave(&host->lock, flags);
 769
 770         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 771
 772         spin_unlock_irqrestore(&host->lock, flags);
 773
 774         return !(present & SDHCI_WRITE_PROTECT);
 775 }
 776
 777 static struct mmc_host_ops sdhci_ops = {
 778         .request        = sdhci_request,
 779         .set_ios        = sdhci_set_ios,
 780         .get_ro         = sdhci_get_ro,
 781 };
 782
 783 /*****************************************************************************\
 784  *                                                                           *
 785  * Tasklets                                                                  *
 786  *                                                                           *
 787 \*****************************************************************************/
 788
 789 static void sdhci_tasklet_card(unsigned long param)
 790 {
 791         struct sdhci_host *host;
 792         unsigned long flags;
 793
 794         host = (struct sdhci_host*)param;
 795
 796         spin_lock_irqsave(&host->lock, flags);
 797
 798         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 799                 if (host->mrq) {
 800                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 801                                 mmc_hostname(host->mmc));
 802                         printk(KERN_ERR "%s: Resetting controller.\n",
 803                                 mmc_hostname(host->mmc));
 804
 805                         sdhci_reset(host, SDHCI_RESET_CMD);
 806                         sdhci_reset(host, SDHCI_RESET_DATA);
 807
 808                         host->mrq->cmd->error = MMC_ERR_FAILED;
 809                         tasklet_schedule(&host->finish_tasklet);
 810                 }
 811         }
 812
 813         spin_unlock_irqrestore(&host->lock, flags);
 814
 815         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 816 }
 817
 818 static void sdhci_tasklet_finish(unsigned long param)
 819 {
 820         struct sdhci_host *host;
 821         unsigned long flags;
 822         struct mmc_request *mrq;
 823
 824         host = (struct sdhci_host*)param;
 825
 826         spin_lock_irqsave(&host->lock, flags);
 827
 828         del_timer(&host->timer);
 829
 830         mrq = host->mrq;
 831
 832         DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 833
 834         /*
 835          * The controller needs a reset of internal state machines
 836          * upon error conditions.
 837          */
 838         if ((mrq->cmd->error != MMC_ERR_NONE) ||
 839                 (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
 840                 (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
 841
 842                 /* Some controllers need this kick or reset won't work here */
 843                 if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 844                         unsigned int clock;
 845
 846                         /* This is to force an update */
 847                         clock = host->clock;
 848                         host->clock = 0;
 849                         sdhci_set_clock(host, clock);
 850                 }
 851
 852                 /* Spec says we should do both at the same time, but Ricoh
 853                    controllers do not like that. */
 854                 sdhci_reset(host, SDHCI_RESET_CMD);
 855                 sdhci_reset(host, SDHCI_RESET_DATA);
 856         }
 857
 858         host->mrq = NULL;
 859         host->cmd = NULL;
 860         host->data = NULL;
 861
 862         sdhci_deactivate_led(host);
 863
 864         spin_unlock_irqrestore(&host->lock, flags);
 865
 866         mmc_request_done(host->mmc, mrq);
 867 }
 868
 869 static void sdhci_timeout_timer(unsigned long data)
 870 {
 871         struct sdhci_host *host;
 872         unsigned long flags;
 873
 874         host = (struct sdhci_host*)data;
 875
 876         spin_lock_irqsave(&host->lock, flags);
 877
 878         if (host->mrq) {
 879                 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
 880                         "Please report this to " BUGMAIL ".\n",
 881                         mmc_hostname(host->mmc));
 882                 sdhci_dumpregs(host);
 883
 884                 if (host->data) {
 885                         host->data->error = MMC_ERR_TIMEOUT;
 886                         sdhci_finish_data(host);
 887                 } else {
 888                         if (host->cmd)
 889                                 host->cmd->error = MMC_ERR_TIMEOUT;
 890                         else
 891                                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 892
 893                         tasklet_schedule(&host->finish_tasklet);
 894                 }
 895         }
 896
 897         spin_unlock_irqrestore(&host->lock, flags);
 898 }
 899
 900 /*****************************************************************************\
 901  *                                                                           *
 902  * Interrupt handling                                                        *
 903  *                                                                           *
 904 \*****************************************************************************/
 905
 906 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 907 {
 908         BUG_ON(intmask == 0);
 909
 910         if (!host->cmd) {
 911                 printk(KERN_ERR "%s: Got command interrupt even though no "
 912                         "command operation was in progress.\n",
 913                         mmc_hostname(host->mmc));
 914                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 915                         mmc_hostname(host->mmc));
 916                 sdhci_dumpregs(host);
 917                 return;
 918         }
 919
 920         if (intmask & SDHCI_INT_RESPONSE)
 921                 sdhci_finish_command(host);
 922         else {
 923                 if (intmask & SDHCI_INT_TIMEOUT)
 924                         host->cmd->error = MMC_ERR_TIMEOUT;
 925                 else if (intmask & SDHCI_INT_CRC)
 926                         host->cmd->error = MMC_ERR_BADCRC;
 927                 else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
 928                         host->cmd->error = MMC_ERR_FAILED;
 929                 else
 930                         host->cmd->error = MMC_ERR_INVALID;
 931
 932                 tasklet_schedule(&host->finish_tasklet);
 933         }
 934 }
 935
 936 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 937 {
 938         BUG_ON(intmask == 0);
 939
 940         if (!host->data) {
 941                 /*
 942                  * A data end interrupt is sent together with the response
 943                  * for the stop command.
 944                  */
 945                 if (intmask & SDHCI_INT_DATA_END)
 946                         return;
 947
 948                 printk(KERN_ERR "%s: Got data interrupt even though no "
 949                         "data operation was in progress.\n",
 950                         mmc_hostname(host->mmc));
 951                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 952                         mmc_hostname(host->mmc));
 953                 sdhci_dumpregs(host);
 954
 955                 return;
 956         }
 957
 958         if (intmask & SDHCI_INT_DATA_TIMEOUT)
 959                 host->data->error = MMC_ERR_TIMEOUT;
 960         else if (intmask & SDHCI_INT_DATA_CRC)
 961                 host->data->error = MMC_ERR_BADCRC;
 962         else if (intmask & SDHCI_INT_DATA_END_BIT)
 963                 host->data->error = MMC_ERR_FAILED;
 964
 965         if (host->data->error != MMC_ERR_NONE)
 966                 sdhci_finish_data(host);
 967         else {
 968                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
 969                         sdhci_transfer_pio(host);
 970
 971                 if (intmask & SDHCI_INT_DATA_END)
 972                         sdhci_finish_data(host);
 973         }
 974 }
 975
 976 static irqreturn_t sdhci_irq(int irq, void *dev_id, struct pt_regs *regs)
 977 {
 978         irqreturn_t result;
 979         struct sdhci_host* host = dev_id;
 980         u32 intmask;
 981
 982         spin_lock(&host->lock);
 983
 984         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
 985
 986         if (!intmask) {
 987                 result = IRQ_NONE;
 988                 goto out;
 989         }
 990
 991         DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
 992
 993         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
 994                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
 995                         host->ioaddr + SDHCI_INT_STATUS);
 996                 tasklet_schedule(&host->card_tasklet);
 997         }
 998
 999         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1000
1001         if (intmask & SDHCI_INT_CMD_MASK) {
1002                 writel(intmask & SDHCI_INT_CMD_MASK,
1003                         host->ioaddr + SDHCI_INT_STATUS);
1004                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1005         }
1006
1007         if (intmask & SDHCI_INT_DATA_MASK) {
1008                 writel(intmask & SDHCI_INT_DATA_MASK,
1009                         host->ioaddr + SDHCI_INT_STATUS);
1010                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1011         }
1012
1013         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1014
1015         if (intmask & SDHCI_INT_BUS_POWER) {
1016                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1017                         mmc_hostname(host->mmc));
1018                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1019         }
1020
1021         intmask &= SDHCI_INT_BUS_POWER;
1022
1023         if (intmask) {
1024                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x. Please "
1025                         "report this to " BUGMAIL ".\n",
1026                         mmc_hostname(host->mmc), intmask);
1027                 sdhci_dumpregs(host);
1028
1029                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1030         }
1031
1032         result = IRQ_HANDLED;
1033
1034 out:
1035         spin_unlock(&host->lock);
1036
1037         return result;
1038 }
1039
1040 /*****************************************************************************\
1041  *                                                                           *
1042  * Suspend/resume                                                            *
1043  *                                                                           *
1044 \*****************************************************************************/
1045
1046 #ifdef CONFIG_PM
1047
1048 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
1049 {
1050         struct sdhci_chip *chip;
1051         int i, ret;
1052
1053         chip = pci_get_drvdata(pdev);
1054         if (!chip)
1055                 return 0;
1056
1057         DBG("Suspending...\n");
1058
1059         for (i = 0;i < chip->num_slots;i++) {
1060                 if (!chip->hosts[i])
1061                         continue;
1062                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
1063                 if (ret) {
1064                         for (i--;i >= 0;i--)
1065                                 mmc_resume_host(chip->hosts[i]->mmc);
1066                         return ret;
1067                 }
1068         }
1069
1070         pci_save_state(pdev);
1071         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
1072         pci_disable_device(pdev);
1073         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1074
1075         return 0;
1076 }
1077
1078 static int sdhci_resume (struct pci_dev *pdev)
1079 {
1080         struct sdhci_chip *chip;
1081         int i, ret;
1082
1083         chip = pci_get_drvdata(pdev);
1084         if (!chip)
1085                 return 0;
1086
1087         DBG("Resuming...\n");
1088
1089         pci_set_power_state(pdev, PCI_D0);
1090         pci_restore_state(pdev);
1091         pci_enable_device(pdev);
1092
1093         for (i = 0;i < chip->num_slots;i++) {
1094                 if (!chip->hosts[i])
1095                         continue;
1096                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
1097                         pci_set_master(pdev);
1098                 sdhci_init(chip->hosts[i]);
1099                 ret = mmc_resume_host(chip->hosts[i]->mmc);
1100                 if (ret)
1101                         return ret;
1102         }
1103
1104         return 0;
1105 }
1106
1107 #else /* CONFIG_PM */
1108
1109 #define sdhci_suspend NULL
1110 #define sdhci_resume NULL
1111
1112 #endif /* CONFIG_PM */
1113
1114 /*****************************************************************************\
1115  *                                                                           *
1116  * Device probing/removal                                                    *
1117  *                                                                           *
1118 \*****************************************************************************/
1119
1120 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
1121 {
1122         int ret;
1123         unsigned int version;
1124         struct sdhci_chip *chip;
1125         struct mmc_host *mmc;
1126         struct sdhci_host *host;
1127
1128         u8 first_bar;
1129         unsigned int caps;
1130
1131         chip = pci_get_drvdata(pdev);
1132         BUG_ON(!chip);
1133
1134         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
1135         if (ret)
1136                 return ret;
1137
1138         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
1139
1140         if (first_bar > 5) {
1141                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
1142                 return -ENODEV;
1143         }
1144
1145         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
1146                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
1147                 return -ENODEV;
1148         }
1149
1150         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
1151                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. Aborting.\n");
1152                 return -ENODEV;
1153         }
1154
1155         if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
1156                 printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
1157                 return -ENODEV;
1158         }
1159
1160         if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
1161                 printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
1162                 return -ENODEV;
1163         }
1164
1165         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
1166         if (!mmc)
1167                 return -ENOMEM;
1168
1169         host = mmc_priv(mmc);
1170         host->mmc = mmc;
1171
1172         host->bar = first_bar + slot;
1173
1174         host->addr = pci_resource_start(pdev, host->bar);
1175         host->irq = pdev->irq;
1176
1177         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1178
1179         snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
1180
1181         ret = pci_request_region(pdev, host->bar, host->slot_descr);
1182         if (ret)
1183                 goto free;
1184
1185         host->ioaddr = ioremap_nocache(host->addr,
1186                 pci_resource_len(pdev, host->bar));
1187         if (!host->ioaddr) {
1188                 ret = -ENOMEM;
1189                 goto release;
1190         }
1191
1192         sdhci_reset(host, SDHCI_RESET_ALL);
1193
1194         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1195         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1196         if (version != 0) {
1197                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1198                         "Cowardly refusing to continue.\n", host->slot_descr,
1199                         version);
1200                 ret = -ENODEV;
1201                 goto unmap;
1202         }
1203
1204         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1205
1206         if (debug_nodma)
1207                 DBG("DMA forced off\n");
1208         else if (debug_forcedma) {
1209                 DBG("DMA forced on\n");
1210                 host->flags |= SDHCI_USE_DMA;
1211         } else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
1212                 host->flags |= SDHCI_USE_DMA;
1213         else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
1214                 DBG("Controller doesn't have DMA interface\n");
1215         else if (!(caps & SDHCI_CAN_DO_DMA))
1216                 DBG("Controller doesn't have DMA capability\n");
1217         else
1218                 host->flags |= SDHCI_USE_DMA;
1219
1220         if (host->flags & SDHCI_USE_DMA) {
1221                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1222                         printk(KERN_WARNING "%s: No suitable DMA available. "
1223                                 "Falling back to PIO.\n", host->slot_descr);
1224                         host->flags &= ~SDHCI_USE_DMA;
1225                 }
1226         }
1227
1228         if (host->flags & SDHCI_USE_DMA)
1229                 pci_set_master(pdev);
1230         else /* XXX: Hack to get MMC layer to avoid highmem */
1231                 pdev->dma_mask = 0;
1232
1233         host->max_clk =
1234                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1235         if (host->max_clk == 0) {
1236                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1237                         "frequency.\n", host->slot_descr);
1238                 ret = -ENODEV;
1239                 goto unmap;
1240         }
1241         host->max_clk *= 1000000;
1242
1243         host->timeout_clk =
1244                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1245         if (host->timeout_clk == 0) {
1246                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1247                         "frequency.\n", host->slot_descr);
1248                 ret = -ENODEV;
1249                 goto unmap;
1250         }
1251         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1252                 host->timeout_clk *= 1000;
1253
1254         host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1255         if (host->max_block >= 3) {
1256                 printk(KERN_ERR "%s: Invalid maximum block size.\n",
1257                         host->slot_descr);
1258                 ret = -ENODEV;
1259                 goto unmap;
1260         }
1261         host->max_block = 512 << host->max_block;
1262
1263         /*
1264          * Set host parameters.
1265          */
1266         mmc->ops = &sdhci_ops;
1267         mmc->f_min = host->max_clk / 256;
1268         mmc->f_max = host->max_clk;
1269         mmc->caps = MMC_CAP_4_BIT_DATA;
1270
1271         mmc->ocr_avail = 0;
1272         if (caps & SDHCI_CAN_VDD_330)
1273                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1274         else if (caps & SDHCI_CAN_VDD_300)
1275                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1276         else if (caps & SDHCI_CAN_VDD_180)
1277                 mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
1278
1279         if (mmc->ocr_avail == 0) {
1280                 printk(KERN_ERR "%s: Hardware doesn't report any "
1281                         "support voltages.\n", host->slot_descr);
1282                 ret = -ENODEV;
1283                 goto unmap;
1284         }
1285
1286         spin_lock_init(&host->lock);
1287
1288         /*
1289          * Maximum number of segments. Hardware cannot do scatter lists.
1290          */
1291         if (host->flags & SDHCI_USE_DMA)
1292                 mmc->max_hw_segs = 1;
1293         else
1294                 mmc->max_hw_segs = 16;
1295         mmc->max_phys_segs = 16;
1296
1297         /*
1298          * Maximum number of sectors in one transfer. Limited by DMA boundary
1299          * size (512KiB), which means (512 KiB/512=) 1024 entries.
1300          */
1301         mmc->max_sectors = 1024;
1302
1303         /*
1304          * Maximum segment size. Could be one segment with the maximum number
1305          * of sectors.
1306          */
1307         mmc->max_seg_size = mmc->max_sectors * 512;
1308
1309         /*
1310          * Init tasklets.
1311          */
1312         tasklet_init(&host->card_tasklet,
1313                 sdhci_tasklet_card, (unsigned long)host);
1314         tasklet_init(&host->finish_tasklet,
1315                 sdhci_tasklet_finish, (unsigned long)host);
1316
1317         setup_timer(&host->timer, sdhci_timeout_timer, (long)host);
1318
1319         ret = request_irq(host->irq, sdhci_irq, SA_SHIRQ,
1320                 host->slot_descr, host);
1321         if (ret)
1322                 goto untasklet;
1323
1324         sdhci_init(host);
1325
1326 #ifdef CONFIG_MMC_DEBUG
1327         sdhci_dumpregs(host);
1328 #endif
1329
1330         host->chip = chip;
1331         chip->hosts[slot] = host;
1332
1333         mmc_add_host(mmc);
1334
1335         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
1336                 host->addr, host->irq,
1337                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1338
1339         return 0;
1340
1341 untasklet:
1342         tasklet_kill(&host->card_tasklet);
1343         tasklet_kill(&host->finish_tasklet);
1344 unmap:
1345         iounmap(host->ioaddr);
1346 release:
1347         pci_release_region(pdev, host->bar);
1348 free:
1349         mmc_free_host(mmc);
1350
1351         return ret;
1352 }
1353
1354 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1355 {
1356         struct sdhci_chip *chip;
1357         struct mmc_host *mmc;
1358         struct sdhci_host *host;
1359
1360         chip = pci_get_drvdata(pdev);
1361         host = chip->hosts[slot];
1362         mmc = host->mmc;
1363
1364         chip->hosts[slot] = NULL;
1365
1366         mmc_remove_host(mmc);
1367
1368         sdhci_reset(host, SDHCI_RESET_ALL);
1369
1370         free_irq(host->irq, host);
1371
1372         del_timer_sync(&host->timer);
1373
1374         tasklet_kill(&host->card_tasklet);
1375         tasklet_kill(&host->finish_tasklet);
1376
1377         iounmap(host->ioaddr);
1378
1379         pci_release_region(pdev, host->bar);
1380
1381         mmc_free_host(mmc);
1382 }
1383
1384 static int __devinit sdhci_probe(struct pci_dev *pdev,
1385         const struct pci_device_id *ent)
1386 {
1387         int ret, i;
1388         u8 slots, rev;
1389         struct sdhci_chip *chip;
1390
1391         BUG_ON(pdev == NULL);
1392         BUG_ON(ent == NULL);
1393
1394         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
1395
1396         printk(KERN_INFO DRIVER_NAME
1397                 ": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
1398                 pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
1399                 (int)rev);
1400
1401         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1402         if (ret)
1403                 return ret;
1404
1405         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1406         DBG("found %d slot(s)\n", slots);
1407         if (slots == 0)
1408                 return -ENODEV;
1409
1410         ret = pci_enable_device(pdev);
1411         if (ret)
1412                 return ret;
1413
1414         chip = kzalloc(sizeof(struct sdhci_chip) +
1415                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1416         if (!chip) {
1417                 ret = -ENOMEM;
1418                 goto err;
1419         }
1420
1421         chip->pdev = pdev;
1422         chip->quirks = ent->driver_data;
1423
1424         if (debug_quirks)
1425                 chip->quirks = debug_quirks;
1426
1427         chip->num_slots = slots;
1428         pci_set_drvdata(pdev, chip);
1429
1430         for (i = 0;i < slots;i++) {
1431                 ret = sdhci_probe_slot(pdev, i);
1432                 if (ret) {
1433                         for (i--;i >= 0;i--)
1434                                 sdhci_remove_slot(pdev, i);
1435                         goto free;
1436                 }
1437         }
1438
1439         return 0;
1440
1441 free:
1442         pci_set_drvdata(pdev, NULL);
1443         kfree(chip);
1444
1445 err:
1446         pci_disable_device(pdev);
1447         return ret;
1448 }
1449
1450 static void __devexit sdhci_remove(struct pci_dev *pdev)
1451 {
1452         int i;
1453         struct sdhci_chip *chip;
1454
1455         chip = pci_get_drvdata(pdev);
1456
1457         if (chip) {
1458                 for (i = 0;i < chip->num_slots;i++)
1459                         sdhci_remove_slot(pdev, i);
1460
1461                 pci_set_drvdata(pdev, NULL);
1462
1463                 kfree(chip);
1464         }
1465
1466         pci_disable_device(pdev);
1467 }
1468
1469 static struct pci_driver sdhci_driver = {
1470         .name =         DRIVER_NAME,
1471         .id_table =     pci_ids,
1472         .probe =        sdhci_probe,
1473         .remove =       __devexit_p(sdhci_remove),
1474         .suspend =      sdhci_suspend,
1475         .resume =       sdhci_resume,
1476 };
1477
1478 /*****************************************************************************\
1479  *                                                                           *
1480  * Driver init/exit                                                          *
1481  *                                                                           *
1482 \*****************************************************************************/
1483
1484 static int __init sdhci_drv_init(void)
1485 {
1486         printk(KERN_INFO DRIVER_NAME
1487                 ": Secure Digital Host Controller Interface driver, "
1488                 DRIVER_VERSION "\n");
1489         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1490
1491         return pci_register_driver(&sdhci_driver);
1492 }
1493
1494 static void __exit sdhci_drv_exit(void)
1495 {
1496         DBG("Exiting\n");
1497
1498         pci_unregister_driver(&sdhci_driver);
1499 }
1500
1501 module_init(sdhci_drv_init);
1502 module_exit(sdhci_drv_exit);
1503
1504 module_param(debug_nodma, uint, 0444);
1505 module_param(debug_forcedma, uint, 0444);
1506 module_param(debug_quirks, uint, 0444);
1507
1508 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1509 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1510 MODULE_VERSION(DRIVER_VERSION);
1511 MODULE_LICENSE("GPL");
1512
1513 MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
1514 MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
1515 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");