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