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         } else if (host->size != 0) {
 474                 printk(KERN_ERR "%s: %d bytes were left untransferred. "
 475                         "Please report this to " BUGMAIL ".\n",
 476                         mmc_hostname(host->mmc), host->size);
 477                 data->error = MMC_ERR_FAILED;
 478         }
 479
 480         DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 481
 482         if (data->stop) {
 483                 /*
 484                  * The controller needs a reset of internal state machines
 485                  * upon error conditions.
 486                  */
 487                 if (data->error != MMC_ERR_NONE) {
 488                         sdhci_reset(host, SDHCI_RESET_CMD);
 489                         sdhci_reset(host, SDHCI_RESET_DATA);
 490                 }
 491
 492                 sdhci_send_command(host, data->stop);
 493         } else
 494                 tasklet_schedule(&host->finish_tasklet);
 495 }
 496
 497 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 498 {
 499         int flags;
 500         u32 mask;
 501         unsigned long timeout;
 502
 503         WARN_ON(host->cmd);
 504
 505         DBG("Sending cmd (%x)\n", cmd->opcode);
 506
 507         /* Wait max 10 ms */
 508         timeout = 10;
 509
 510         mask = SDHCI_CMD_INHIBIT;
 511         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 512                 mask |= SDHCI_DATA_INHIBIT;
 513
 514         /* We shouldn't wait for data inihibit for stop commands, even
 515            though they might use busy signaling */
 516         if (host->mrq->data && (cmd == host->mrq->data->stop))
 517                 mask &= ~SDHCI_DATA_INHIBIT;
 518
 519         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 520                 if (timeout == 0) {
 521                         printk(KERN_ERR "%s: Controller never released "
 522                                 "inhibit bit(s). Please report this to "
 523                                 BUGMAIL ".\n", mmc_hostname(host->mmc));
 524                         sdhci_dumpregs(host);
 525                         cmd->error = MMC_ERR_FAILED;
 526                         tasklet_schedule(&host->finish_tasklet);
 527                         return;
 528                 }
 529                 timeout--;
 530                 mdelay(1);
 531         }
 532
 533         mod_timer(&host->timer, jiffies + 10 * HZ);
 534
 535         host->cmd = cmd;
 536
 537         sdhci_prepare_data(host, cmd->data);
 538
 539         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 540
 541         sdhci_set_transfer_mode(host, cmd->data);
 542
 543         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 544                 printk(KERN_ERR "%s: Unsupported response type! "
 545                         "Please report this to " BUGMAIL ".\n",
 546                         mmc_hostname(host->mmc));
 547                 cmd->error = MMC_ERR_INVALID;
 548                 tasklet_schedule(&host->finish_tasklet);
 549                 return;
 550         }
 551
 552         if (!(cmd->flags & MMC_RSP_PRESENT))
 553                 flags = SDHCI_CMD_RESP_NONE;
 554         else if (cmd->flags & MMC_RSP_136)
 555                 flags = SDHCI_CMD_RESP_LONG;
 556         else if (cmd->flags & MMC_RSP_BUSY)
 557                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 558         else
 559                 flags = SDHCI_CMD_RESP_SHORT;
 560
 561         if (cmd->flags & MMC_RSP_CRC)
 562                 flags |= SDHCI_CMD_CRC;
 563         if (cmd->flags & MMC_RSP_OPCODE)
 564                 flags |= SDHCI_CMD_INDEX;
 565         if (cmd->data)
 566                 flags |= SDHCI_CMD_DATA;
 567
 568         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 569                 host->ioaddr + SDHCI_COMMAND);
 570 }
 571
 572 static void sdhci_finish_command(struct sdhci_host *host)
 573 {
 574         int i;
 575
 576         BUG_ON(host->cmd == NULL);
 577
 578         if (host->cmd->flags & MMC_RSP_PRESENT) {
 579                 if (host->cmd->flags & MMC_RSP_136) {
 580                         /* CRC is stripped so we need to do some shifting. */
 581                         for (i = 0;i < 4;i++) {
 582                                 host->cmd->resp[i] = readl(host->ioaddr +
 583                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 584                                 if (i != 3)
 585                                         host->cmd->resp[i] |=
 586                                                 readb(host->ioaddr +
 587                                                 SDHCI_RESPONSE + (3-i)*4-1);
 588                         }
 589                 } else {
 590                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 591                 }
 592         }
 593
 594         host->cmd->error = MMC_ERR_NONE;
 595
 596         DBG("Ending cmd (%x)\n", host->cmd->opcode);
 597
 598         if (host->cmd->data)
 599                 host->data = host->cmd->data;
 600         else
 601                 tasklet_schedule(&host->finish_tasklet);
 602
 603         host->cmd = NULL;
 604 }
 605
 606 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 607 {
 608         int div;
 609         u16 clk;
 610         unsigned long timeout;
 611
 612         if (clock == host->clock)
 613                 return;
 614
 615         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 616
 617         if (clock == 0)
 618                 goto out;
 619
 620         for (div = 1;div < 256;div *= 2) {
 621                 if ((host->max_clk / div) <= clock)
 622                         break;
 623         }
 624         div >>= 1;
 625
 626         clk = div << SDHCI_DIVIDER_SHIFT;
 627         clk |= SDHCI_CLOCK_INT_EN;
 628         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 629
 630         /* Wait max 10 ms */
 631         timeout = 10;
 632         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 633                 & SDHCI_CLOCK_INT_STABLE)) {
 634                 if (timeout == 0) {
 635                         printk(KERN_ERR "%s: Internal clock never stabilised. "
 636                                 "Please report this to " BUGMAIL ".\n",
 637                                 mmc_hostname(host->mmc));
 638                         sdhci_dumpregs(host);
 639                         return;
 640                 }
 641                 timeout--;
 642                 mdelay(1);
 643         }
 644
 645         clk |= SDHCI_CLOCK_CARD_EN;
 646         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 647
 648 out:
 649         host->clock = clock;
 650 }
 651
 652 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 653 {
 654         u8 pwr;
 655
 656         if (host->power == power)
 657                 return;
 658
 659         writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 660
 661         if (power == (unsigned short)-1)
 662                 goto out;
 663
 664         pwr = SDHCI_POWER_ON;
 665
 666         switch (power) {
 667         case MMC_VDD_170:
 668         case MMC_VDD_180:
 669         case MMC_VDD_190:
 670                 pwr |= SDHCI_POWER_180;
 671                 break;
 672         case MMC_VDD_290:
 673         case MMC_VDD_300:
 674         case MMC_VDD_310:
 675                 pwr |= SDHCI_POWER_300;
 676                 break;
 677         case MMC_VDD_320:
 678         case MMC_VDD_330:
 679         case MMC_VDD_340:
 680                 pwr |= SDHCI_POWER_330;
 681                 break;
 682         default:
 683                 BUG();
 684         }
 685
 686         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 687
 688 out:
 689         host->power = power;
 690 }
 691
 692 /*****************************************************************************\
 693  *                                                                           *
 694  * MMC callbacks                                                             *
 695  *                                                                           *
 696 \*****************************************************************************/
 697
 698 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 699 {
 700         struct sdhci_host *host;
 701         unsigned long flags;
 702
 703         host = mmc_priv(mmc);
 704
 705         spin_lock_irqsave(&host->lock, flags);
 706
 707         WARN_ON(host->mrq != NULL);
 708
 709         sdhci_activate_led(host);
 710
 711         host->mrq = mrq;
 712
 713         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 714                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 715                 tasklet_schedule(&host->finish_tasklet);
 716         } else
 717                 sdhci_send_command(host, mrq->cmd);
 718
 719         spin_unlock_irqrestore(&host->lock, flags);
 720 }
 721
 722 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 723 {
 724         struct sdhci_host *host;
 725         unsigned long flags;
 726         u8 ctrl;
 727
 728         host = mmc_priv(mmc);
 729
 730         spin_lock_irqsave(&host->lock, flags);
 731
 732         /*
 733          * Reset the chip on each power off.
 734          * Should clear out any weird states.
 735          */
 736         if (ios->power_mode == MMC_POWER_OFF) {
 737                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 738                 sdhci_init(host);
 739         }
 740
 741         sdhci_set_clock(host, ios->clock);
 742
 743         if (ios->power_mode == MMC_POWER_OFF)
 744                 sdhci_set_power(host, -1);
 745         else
 746                 sdhci_set_power(host, ios->vdd);
 747
 748         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 749         if (ios->bus_width == MMC_BUS_WIDTH_4)
 750                 ctrl |= SDHCI_CTRL_4BITBUS;
 751         else
 752                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 753         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 754
 755         spin_unlock_irqrestore(&host->lock, flags);
 756 }
 757
 758 static int sdhci_get_ro(struct mmc_host *mmc)
 759 {
 760         struct sdhci_host *host;
 761         unsigned long flags;
 762         int present;
 763
 764         host = mmc_priv(mmc);
 765
 766         spin_lock_irqsave(&host->lock, flags);
 767
 768         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 769
 770         spin_unlock_irqrestore(&host->lock, flags);
 771
 772         return !(present & SDHCI_WRITE_PROTECT);
 773 }
 774
 775 static struct mmc_host_ops sdhci_ops = {
 776         .request        = sdhci_request,
 777         .set_ios        = sdhci_set_ios,
 778         .get_ro         = sdhci_get_ro,
 779 };
 780
 781 /*****************************************************************************\
 782  *                                                                           *
 783  * Tasklets                                                                  *
 784  *                                                                           *
 785 \*****************************************************************************/
 786
 787 static void sdhci_tasklet_card(unsigned long param)
 788 {
 789         struct sdhci_host *host;
 790         unsigned long flags;
 791
 792         host = (struct sdhci_host*)param;
 793
 794         spin_lock_irqsave(&host->lock, flags);
 795
 796         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 797                 if (host->mrq) {
 798                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 799                                 mmc_hostname(host->mmc));
 800                         printk(KERN_ERR "%s: Resetting controller.\n",
 801                                 mmc_hostname(host->mmc));
 802
 803                         sdhci_reset(host, SDHCI_RESET_CMD);
 804                         sdhci_reset(host, SDHCI_RESET_DATA);
 805
 806                         host->mrq->cmd->error = MMC_ERR_FAILED;
 807                         tasklet_schedule(&host->finish_tasklet);
 808                 }
 809         }
 810
 811         spin_unlock_irqrestore(&host->lock, flags);
 812
 813         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 814 }
 815
 816 static void sdhci_tasklet_finish(unsigned long param)
 817 {
 818         struct sdhci_host *host;
 819         unsigned long flags;
 820         struct mmc_request *mrq;
 821
 822         host = (struct sdhci_host*)param;
 823
 824         spin_lock_irqsave(&host->lock, flags);
 825
 826         del_timer(&host->timer);
 827
 828         mrq = host->mrq;
 829
 830         DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 831
 832         /*
 833          * The controller needs a reset of internal state machines
 834          * upon error conditions.
 835          */
 836         if ((mrq->cmd->error != MMC_ERR_NONE) ||
 837                 (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
 838                 (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
 839
 840                 /* Some controllers need this kick or reset won't work here */
 841                 if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 842                         unsigned int clock;
 843
 844                         /* This is to force an update */
 845                         clock = host->clock;
 846                         host->clock = 0;
 847                         sdhci_set_clock(host, clock);
 848                 }
 849
 850                 /* Spec says we should do both at the same time, but Ricoh
 851                    controllers do not like that. */
 852                 sdhci_reset(host, SDHCI_RESET_CMD);
 853                 sdhci_reset(host, SDHCI_RESET_DATA);
 854         }
 855
 856         host->mrq = NULL;
 857         host->cmd = NULL;
 858         host->data = NULL;
 859
 860         sdhci_deactivate_led(host);
 861
 862         spin_unlock_irqrestore(&host->lock, flags);
 863
 864         mmc_request_done(host->mmc, mrq);
 865 }
 866
 867 static void sdhci_timeout_timer(unsigned long data)
 868 {
 869         struct sdhci_host *host;
 870         unsigned long flags;
 871
 872         host = (struct sdhci_host*)data;
 873
 874         spin_lock_irqsave(&host->lock, flags);
 875
 876         if (host->mrq) {
 877                 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
 878                         "Please report this to " BUGMAIL ".\n",
 879                         mmc_hostname(host->mmc));
 880                 sdhci_dumpregs(host);
 881
 882                 if (host->data) {
 883                         host->data->error = MMC_ERR_TIMEOUT;
 884                         sdhci_finish_data(host);
 885                 } else {
 886                         if (host->cmd)
 887                                 host->cmd->error = MMC_ERR_TIMEOUT;
 888                         else
 889                                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 890
 891                         tasklet_schedule(&host->finish_tasklet);
 892                 }
 893         }
 894
 895         spin_unlock_irqrestore(&host->lock, flags);
 896 }
 897
 898 /*****************************************************************************\
 899  *                                                                           *
 900  * Interrupt handling                                                        *
 901  *                                                                           *
 902 \*****************************************************************************/
 903
 904 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 905 {
 906         BUG_ON(intmask == 0);
 907
 908         if (!host->cmd) {
 909                 printk(KERN_ERR "%s: Got command interrupt even though no "
 910                         "command operation was in progress.\n",
 911                         mmc_hostname(host->mmc));
 912                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 913                         mmc_hostname(host->mmc));
 914                 sdhci_dumpregs(host);
 915                 return;
 916         }
 917
 918         if (intmask & SDHCI_INT_RESPONSE)
 919                 sdhci_finish_command(host);
 920         else {
 921                 if (intmask & SDHCI_INT_TIMEOUT)
 922                         host->cmd->error = MMC_ERR_TIMEOUT;
 923                 else if (intmask & SDHCI_INT_CRC)
 924                         host->cmd->error = MMC_ERR_BADCRC;
 925                 else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
 926                         host->cmd->error = MMC_ERR_FAILED;
 927                 else
 928                         host->cmd->error = MMC_ERR_INVALID;
 929
 930                 tasklet_schedule(&host->finish_tasklet);
 931         }
 932 }
 933
 934 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 935 {
 936         BUG_ON(intmask == 0);
 937
 938         if (!host->data) {
 939                 /*
 940                  * A data end interrupt is sent together with the response
 941                  * for the stop command.
 942                  */
 943                 if (intmask & SDHCI_INT_DATA_END)
 944                         return;
 945
 946                 printk(KERN_ERR "%s: Got data interrupt even though no "
 947                         "data operation was in progress.\n",
 948                         mmc_hostname(host->mmc));
 949                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 950                         mmc_hostname(host->mmc));
 951                 sdhci_dumpregs(host);
 952
 953                 return;
 954         }
 955
 956         if (intmask & SDHCI_INT_DATA_TIMEOUT)
 957                 host->data->error = MMC_ERR_TIMEOUT;
 958         else if (intmask & SDHCI_INT_DATA_CRC)
 959                 host->data->error = MMC_ERR_BADCRC;
 960         else if (intmask & SDHCI_INT_DATA_END_BIT)
 961                 host->data->error = MMC_ERR_FAILED;
 962
 963         if (host->data->error != MMC_ERR_NONE)
 964                 sdhci_finish_data(host);
 965         else {
 966                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
 967                         sdhci_transfer_pio(host);
 968
 969                 if (intmask & SDHCI_INT_DATA_END)
 970                         sdhci_finish_data(host);
 971         }
 972 }
 973
 974 static irqreturn_t sdhci_irq(int irq, void *dev_id, struct pt_regs *regs)
 975 {
 976         irqreturn_t result;
 977         struct sdhci_host* host = dev_id;
 978         u32 intmask;
 979
 980         spin_lock(&host->lock);
 981
 982         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
 983
 984         if (!intmask) {
 985                 result = IRQ_NONE;
 986                 goto out;
 987         }
 988
 989         DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
 990
 991         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
 992                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
 993                         host->ioaddr + SDHCI_INT_STATUS);
 994                 tasklet_schedule(&host->card_tasklet);
 995         }
 996
 997         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
 998
 999         if (intmask & SDHCI_INT_CMD_MASK) {
1000                 writel(intmask & SDHCI_INT_CMD_MASK,
1001                         host->ioaddr + SDHCI_INT_STATUS);
1002                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1003         }
1004
1005         if (intmask & SDHCI_INT_DATA_MASK) {
1006                 writel(intmask & SDHCI_INT_DATA_MASK,
1007                         host->ioaddr + SDHCI_INT_STATUS);
1008                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1009         }
1010
1011         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1012
1013         if (intmask & SDHCI_INT_BUS_POWER) {
1014                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1015                         mmc_hostname(host->mmc));
1016                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1017         }
1018
1019         intmask &= SDHCI_INT_BUS_POWER;
1020
1021         if (intmask) {
1022                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x. Please "
1023                         "report this to " BUGMAIL ".\n",
1024                         mmc_hostname(host->mmc), intmask);
1025                 sdhci_dumpregs(host);
1026
1027                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1028         }
1029
1030         result = IRQ_HANDLED;
1031
1032 out:
1033         spin_unlock(&host->lock);
1034
1035         return result;
1036 }
1037
1038 /*****************************************************************************\
1039  *                                                                           *
1040  * Suspend/resume                                                            *
1041  *                                                                           *
1042 \*****************************************************************************/
1043
1044 #ifdef CONFIG_PM
1045
1046 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
1047 {
1048         struct sdhci_chip *chip;
1049         int i, ret;
1050
1051         chip = pci_get_drvdata(pdev);
1052         if (!chip)
1053                 return 0;
1054
1055         DBG("Suspending...\n");
1056
1057         for (i = 0;i < chip->num_slots;i++) {
1058                 if (!chip->hosts[i])
1059                         continue;
1060                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
1061                 if (ret) {
1062                         for (i--;i >= 0;i--)
1063                                 mmc_resume_host(chip->hosts[i]->mmc);
1064                         return ret;
1065                 }
1066         }
1067
1068         pci_save_state(pdev);
1069         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
1070         pci_disable_device(pdev);
1071         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1072
1073         return 0;
1074 }
1075
1076 static int sdhci_resume (struct pci_dev *pdev)
1077 {
1078         struct sdhci_chip *chip;
1079         int i, ret;
1080
1081         chip = pci_get_drvdata(pdev);
1082         if (!chip)
1083                 return 0;
1084
1085         DBG("Resuming...\n");
1086
1087         pci_set_power_state(pdev, PCI_D0);
1088         pci_restore_state(pdev);
1089         pci_enable_device(pdev);
1090
1091         for (i = 0;i < chip->num_slots;i++) {
1092                 if (!chip->hosts[i])
1093                         continue;
1094                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
1095                         pci_set_master(pdev);
1096                 sdhci_init(chip->hosts[i]);
1097                 ret = mmc_resume_host(chip->hosts[i]->mmc);
1098                 if (ret)
1099                         return ret;
1100         }
1101
1102         return 0;
1103 }
1104
1105 #else /* CONFIG_PM */
1106
1107 #define sdhci_suspend NULL
1108 #define sdhci_resume NULL
1109
1110 #endif /* CONFIG_PM */
1111
1112 /*****************************************************************************\
1113  *                                                                           *
1114  * Device probing/removal                                                    *
1115  *                                                                           *
1116 \*****************************************************************************/
1117
1118 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
1119 {
1120         int ret;
1121         unsigned int version;
1122         struct sdhci_chip *chip;
1123         struct mmc_host *mmc;
1124         struct sdhci_host *host;
1125
1126         u8 first_bar;
1127         unsigned int caps;
1128
1129         chip = pci_get_drvdata(pdev);
1130         BUG_ON(!chip);
1131
1132         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
1133         if (ret)
1134                 return ret;
1135
1136         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
1137
1138         if (first_bar > 5) {
1139                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
1140                 return -ENODEV;
1141         }
1142
1143         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
1144                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
1145                 return -ENODEV;
1146         }
1147
1148         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
1149                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. Aborting.\n");
1150                 return -ENODEV;
1151         }
1152
1153         if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
1154                 printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
1155                 return -ENODEV;
1156         }
1157
1158         if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
1159                 printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
1160                 return -ENODEV;
1161         }
1162
1163         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
1164         if (!mmc)
1165                 return -ENOMEM;
1166
1167         host = mmc_priv(mmc);
1168         host->mmc = mmc;
1169
1170         host->bar = first_bar + slot;
1171
1172         host->addr = pci_resource_start(pdev, host->bar);
1173         host->irq = pdev->irq;
1174
1175         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1176
1177         snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
1178
1179         ret = pci_request_region(pdev, host->bar, host->slot_descr);
1180         if (ret)
1181                 goto free;
1182
1183         host->ioaddr = ioremap_nocache(host->addr,
1184                 pci_resource_len(pdev, host->bar));
1185         if (!host->ioaddr) {
1186                 ret = -ENOMEM;
1187                 goto release;
1188         }
1189
1190         sdhci_reset(host, SDHCI_RESET_ALL);
1191
1192         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1193         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1194         if (version != 0) {
1195                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1196                         "You may experience problems.\n", host->slot_descr,
1197                         version);
1198         }
1199
1200         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1201
1202         if (debug_nodma)
1203                 DBG("DMA forced off\n");
1204         else if (debug_forcedma) {
1205                 DBG("DMA forced on\n");
1206                 host->flags |= SDHCI_USE_DMA;
1207         } else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
1208                 host->flags |= SDHCI_USE_DMA;
1209         else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
1210                 DBG("Controller doesn't have DMA interface\n");
1211         else if (!(caps & SDHCI_CAN_DO_DMA))
1212                 DBG("Controller doesn't have DMA capability\n");
1213         else
1214                 host->flags |= SDHCI_USE_DMA;
1215
1216         if (host->flags & SDHCI_USE_DMA) {
1217                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1218                         printk(KERN_WARNING "%s: No suitable DMA available. "
1219                                 "Falling back to PIO.\n", host->slot_descr);
1220                         host->flags &= ~SDHCI_USE_DMA;
1221                 }
1222         }
1223
1224         if (host->flags & SDHCI_USE_DMA)
1225                 pci_set_master(pdev);
1226         else /* XXX: Hack to get MMC layer to avoid highmem */
1227                 pdev->dma_mask = 0;
1228
1229         host->max_clk =
1230                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1231         if (host->max_clk == 0) {
1232                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1233                         "frequency.\n", host->slot_descr);
1234                 ret = -ENODEV;
1235                 goto unmap;
1236         }
1237         host->max_clk *= 1000000;
1238
1239         host->timeout_clk =
1240                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1241         if (host->timeout_clk == 0) {
1242                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1243                         "frequency.\n", host->slot_descr);
1244                 ret = -ENODEV;
1245                 goto unmap;
1246         }
1247         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1248                 host->timeout_clk *= 1000;
1249
1250         host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1251         if (host->max_block >= 3) {
1252                 printk(KERN_ERR "%s: Invalid maximum block size.\n",
1253                         host->slot_descr);
1254                 ret = -ENODEV;
1255                 goto unmap;
1256         }
1257         host->max_block = 512 << host->max_block;
1258
1259         /*
1260          * Set host parameters.
1261          */
1262         mmc->ops = &sdhci_ops;
1263         mmc->f_min = host->max_clk / 256;
1264         mmc->f_max = host->max_clk;
1265         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1266
1267         mmc->ocr_avail = 0;
1268         if (caps & SDHCI_CAN_VDD_330)
1269                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1270         else if (caps & SDHCI_CAN_VDD_300)
1271                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1272         else if (caps & SDHCI_CAN_VDD_180)
1273                 mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
1274
1275         if (mmc->ocr_avail == 0) {
1276                 printk(KERN_ERR "%s: Hardware doesn't report any "
1277                         "support voltages.\n", host->slot_descr);
1278                 ret = -ENODEV;
1279                 goto unmap;
1280         }
1281
1282         spin_lock_init(&host->lock);
1283
1284         /*
1285          * Maximum number of segments. Hardware cannot do scatter lists.
1286          */
1287         if (host->flags & SDHCI_USE_DMA)
1288                 mmc->max_hw_segs = 1;
1289         else
1290                 mmc->max_hw_segs = 16;
1291         mmc->max_phys_segs = 16;
1292
1293         /*
1294          * Maximum number of sectors in one transfer. Limited by DMA boundary
1295          * size (512KiB), which means (512 KiB/512=) 1024 entries.
1296          */
1297         mmc->max_sectors = 1024;
1298
1299         /*
1300          * Maximum segment size. Could be one segment with the maximum number
1301          * of sectors.
1302          */
1303         mmc->max_seg_size = mmc->max_sectors * 512;
1304
1305         /*
1306          * Init tasklets.
1307          */
1308         tasklet_init(&host->card_tasklet,
1309                 sdhci_tasklet_card, (unsigned long)host);
1310         tasklet_init(&host->finish_tasklet,
1311                 sdhci_tasklet_finish, (unsigned long)host);
1312
1313         setup_timer(&host->timer, sdhci_timeout_timer, (long)host);
1314
1315         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1316                 host->slot_descr, host);
1317         if (ret)
1318                 goto untasklet;
1319
1320         sdhci_init(host);
1321
1322 #ifdef CONFIG_MMC_DEBUG
1323         sdhci_dumpregs(host);
1324 #endif
1325
1326         host->chip = chip;
1327         chip->hosts[slot] = host;
1328
1329         mmc_add_host(mmc);
1330
1331         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
1332                 host->addr, host->irq,
1333                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1334
1335         return 0;
1336
1337 untasklet:
1338         tasklet_kill(&host->card_tasklet);
1339         tasklet_kill(&host->finish_tasklet);
1340 unmap:
1341         iounmap(host->ioaddr);
1342 release:
1343         pci_release_region(pdev, host->bar);
1344 free:
1345         mmc_free_host(mmc);
1346
1347         return ret;
1348 }
1349
1350 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1351 {
1352         struct sdhci_chip *chip;
1353         struct mmc_host *mmc;
1354         struct sdhci_host *host;
1355
1356         chip = pci_get_drvdata(pdev);
1357         host = chip->hosts[slot];
1358         mmc = host->mmc;
1359
1360         chip->hosts[slot] = NULL;
1361
1362         mmc_remove_host(mmc);
1363
1364         sdhci_reset(host, SDHCI_RESET_ALL);
1365
1366         free_irq(host->irq, host);
1367
1368         del_timer_sync(&host->timer);
1369
1370         tasklet_kill(&host->card_tasklet);
1371         tasklet_kill(&host->finish_tasklet);
1372
1373         iounmap(host->ioaddr);
1374
1375         pci_release_region(pdev, host->bar);
1376
1377         mmc_free_host(mmc);
1378 }
1379
1380 static int __devinit sdhci_probe(struct pci_dev *pdev,
1381         const struct pci_device_id *ent)
1382 {
1383         int ret, i;
1384         u8 slots, rev;
1385         struct sdhci_chip *chip;
1386
1387         BUG_ON(pdev == NULL);
1388         BUG_ON(ent == NULL);
1389
1390         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
1391
1392         printk(KERN_INFO DRIVER_NAME
1393                 ": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
1394                 pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
1395                 (int)rev);
1396
1397         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1398         if (ret)
1399                 return ret;
1400
1401         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1402         DBG("found %d slot(s)\n", slots);
1403         if (slots == 0)
1404                 return -ENODEV;
1405
1406         ret = pci_enable_device(pdev);
1407         if (ret)
1408                 return ret;
1409
1410         chip = kzalloc(sizeof(struct sdhci_chip) +
1411                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1412         if (!chip) {
1413                 ret = -ENOMEM;
1414                 goto err;
1415         }
1416
1417         chip->pdev = pdev;
1418         chip->quirks = ent->driver_data;
1419
1420         if (debug_quirks)
1421                 chip->quirks = debug_quirks;
1422
1423         chip->num_slots = slots;
1424         pci_set_drvdata(pdev, chip);
1425
1426         for (i = 0;i < slots;i++) {
1427                 ret = sdhci_probe_slot(pdev, i);
1428                 if (ret) {
1429                         for (i--;i >= 0;i--)
1430                                 sdhci_remove_slot(pdev, i);
1431                         goto free;
1432                 }
1433         }
1434
1435         return 0;
1436
1437 free:
1438         pci_set_drvdata(pdev, NULL);
1439         kfree(chip);
1440
1441 err:
1442         pci_disable_device(pdev);
1443         return ret;
1444 }
1445
1446 static void __devexit sdhci_remove(struct pci_dev *pdev)
1447 {
1448         int i;
1449         struct sdhci_chip *chip;
1450
1451         chip = pci_get_drvdata(pdev);
1452
1453         if (chip) {
1454                 for (i = 0;i < chip->num_slots;i++)
1455                         sdhci_remove_slot(pdev, i);
1456
1457                 pci_set_drvdata(pdev, NULL);
1458
1459                 kfree(chip);
1460         }
1461
1462         pci_disable_device(pdev);
1463 }
1464
1465 static struct pci_driver sdhci_driver = {
1466         .name =         DRIVER_NAME,
1467         .id_table =     pci_ids,
1468         .probe =        sdhci_probe,
1469         .remove =       __devexit_p(sdhci_remove),
1470         .suspend =      sdhci_suspend,
1471         .resume =       sdhci_resume,
1472 };
1473
1474 /*****************************************************************************\
1475  *                                                                           *
1476  * Driver init/exit                                                          *
1477  *                                                                           *
1478 \*****************************************************************************/
1479
1480 static int __init sdhci_drv_init(void)
1481 {
1482         printk(KERN_INFO DRIVER_NAME
1483                 ": Secure Digital Host Controller Interface driver, "
1484                 DRIVER_VERSION "\n");
1485         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1486
1487         return pci_register_driver(&sdhci_driver);
1488 }
1489
1490 static void __exit sdhci_drv_exit(void)
1491 {
1492         DBG("Exiting\n");
1493
1494         pci_unregister_driver(&sdhci_driver);
1495 }
1496
1497 module_init(sdhci_drv_init);
1498 module_exit(sdhci_drv_exit);
1499
1500 module_param(debug_nodma, uint, 0444);
1501 module_param(debug_forcedma, uint, 0444);
1502 module_param(debug_quirks, uint, 0444);
1503
1504 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1505 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1506 MODULE_VERSION(DRIVER_VERSION);
1507 MODULE_LICENSE("GPL");
1508
1509 MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
1510 MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
1511 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");