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
  26 #define DBG(f, x...) \
  27         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  28
  29 static unsigned int debug_nodma = 0;
  30 static unsigned int debug_forcedma = 0;
  31 static unsigned int debug_quirks = 0;
  32
  33 #define SDHCI_QUIRK_CLOCK_BEFORE_RESET                  (1<<0)
  34 #define SDHCI_QUIRK_FORCE_DMA                           (1<<1)
  35 /* Controller doesn't like some resets when there is no card inserted. */
  36 #define SDHCI_QUIRK_NO_CARD_NO_RESET                    (1<<2)
  37 #define SDHCI_QUIRK_SINGLE_POWER_WRITE                  (1<<3)
  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                                   SDHCI_QUIRK_NO_CARD_NO_RESET,
  56         },
  57
  58         {
  59                 .vendor         = PCI_VENDOR_ID_TI,
  60                 .device         = PCI_DEVICE_ID_TI_XX21_XX11_SD,
  61                 .subvendor      = PCI_ANY_ID,
  62                 .subdevice      = PCI_ANY_ID,
  63                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
  64         },
  65
  66         {
  67                 .vendor         = PCI_VENDOR_ID_ENE,
  68                 .device         = PCI_DEVICE_ID_ENE_CB712_SD,
  69                 .subvendor      = PCI_ANY_ID,
  70                 .subdevice      = PCI_ANY_ID,
  71                 .driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE,
  72         },
  73
  74         {       /* Generic SD host controller */
  75                 PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
  76         },
  77
  78         { /* end: all zeroes */ },
  79 };
  80
  81 MODULE_DEVICE_TABLE(pci, pci_ids);
  82
  83 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  84 static void sdhci_finish_data(struct sdhci_host *);
  85
  86 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  87 static void sdhci_finish_command(struct sdhci_host *);
  88
  89 static void sdhci_dumpregs(struct sdhci_host *host)
  90 {
  91         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  92
  93         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  94                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
  95                 readw(host->ioaddr + SDHCI_HOST_VERSION));
  96         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  97                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
  98                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
  99         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
 100                 readl(host->ioaddr + SDHCI_ARGUMENT),
 101                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
 102         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
 103                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
 104                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
 105         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
 106                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
 107                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
 108         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
 109                 readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
 110                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
 111         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
 112                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
 113                 readl(host->ioaddr + SDHCI_INT_STATUS));
 114         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
 115                 readl(host->ioaddr + SDHCI_INT_ENABLE),
 116                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
 117         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
 118                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
 119                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
 120         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
 121                 readl(host->ioaddr + SDHCI_CAPABILITIES),
 122                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
 123
 124         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
 125 }
 126
 127 /*****************************************************************************\
 128  *                                                                           *
 129  * Low level functions                                                       *
 130  *                                                                           *
 131 \*****************************************************************************/
 132
 133 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 134 {
 135         unsigned long timeout;
 136
 137         if (host->chip->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 138                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
 139                         SDHCI_CARD_PRESENT))
 140                         return;
 141         }
 142
 143         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
 144
 145         if (mask & SDHCI_RESET_ALL)
 146                 host->clock = 0;
 147
 148         /* Wait max 100 ms */
 149         timeout = 100;
 150
 151         /* hw clears the bit when it's done */
 152         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
 153                 if (timeout == 0) {
 154                         printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
 155                                 mmc_hostname(host->mmc), (int)mask);
 156                         sdhci_dumpregs(host);
 157                         return;
 158                 }
 159                 timeout--;
 160                 mdelay(1);
 161         }
 162 }
 163
 164 static void sdhci_init(struct sdhci_host *host)
 165 {
 166         u32 intmask;
 167
 168         sdhci_reset(host, SDHCI_RESET_ALL);
 169
 170         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 171                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 172                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 173                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
 174                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
 175                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
 176
 177         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 178         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 179 }
 180
 181 static void sdhci_activate_led(struct sdhci_host *host)
 182 {
 183         u8 ctrl;
 184
 185         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 186         ctrl |= SDHCI_CTRL_LED;
 187         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 188 }
 189
 190 static void sdhci_deactivate_led(struct sdhci_host *host)
 191 {
 192         u8 ctrl;
 193
 194         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 195         ctrl &= ~SDHCI_CTRL_LED;
 196         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 197 }
 198
 199 /*****************************************************************************\
 200  *                                                                           *
 201  * Core functions                                                            *
 202  *                                                                           *
 203 \*****************************************************************************/
 204
 205 static inline char* sdhci_sg_to_buffer(struct sdhci_host* host)
 206 {
 207         return page_address(host->cur_sg->page) + host->cur_sg->offset;
 208 }
 209
 210 static inline int sdhci_next_sg(struct sdhci_host* host)
 211 {
 212         /*
 213          * Skip to next SG entry.
 214          */
 215         host->cur_sg++;
 216         host->num_sg--;
 217
 218         /*
 219          * Any entries left?
 220          */
 221         if (host->num_sg > 0) {
 222                 host->offset = 0;
 223                 host->remain = host->cur_sg->length;
 224         }
 225
 226         return host->num_sg;
 227 }
 228
 229 static void sdhci_read_block_pio(struct sdhci_host *host)
 230 {
 231         int blksize, chunk_remain;
 232         u32 data;
 233         char *buffer;
 234         int size;
 235
 236         DBG("PIO reading\n");
 237
 238         blksize = host->data->blksz;
 239         chunk_remain = 0;
 240         data = 0;
 241
 242         buffer = sdhci_sg_to_buffer(host) + host->offset;
 243
 244         while (blksize) {
 245                 if (chunk_remain == 0) {
 246                         data = readl(host->ioaddr + SDHCI_BUFFER);
 247                         chunk_remain = min(blksize, 4);
 248                 }
 249
 250                 size = min(host->size, host->remain);
 251                 size = min(size, chunk_remain);
 252
 253                 chunk_remain -= size;
 254                 blksize -= size;
 255                 host->offset += size;
 256                 host->remain -= size;
 257                 host->size -= size;
 258                 while (size) {
 259                         *buffer = data & 0xFF;
 260                         buffer++;
 261                         data >>= 8;
 262                         size--;
 263                 }
 264
 265                 if (host->remain == 0) {
 266                         if (sdhci_next_sg(host) == 0) {
 267                                 BUG_ON(blksize != 0);
 268                                 return;
 269                         }
 270                         buffer = sdhci_sg_to_buffer(host);
 271                 }
 272         }
 273 }
 274
 275 static void sdhci_write_block_pio(struct sdhci_host *host)
 276 {
 277         int blksize, chunk_remain;
 278         u32 data;
 279         char *buffer;
 280         int bytes, size;
 281
 282         DBG("PIO writing\n");
 283
 284         blksize = host->data->blksz;
 285         chunk_remain = 4;
 286         data = 0;
 287
 288         bytes = 0;
 289         buffer = sdhci_sg_to_buffer(host) + host->offset;
 290
 291         while (blksize) {
 292                 size = min(host->size, host->remain);
 293                 size = min(size, chunk_remain);
 294
 295                 chunk_remain -= size;
 296                 blksize -= size;
 297                 host->offset += size;
 298                 host->remain -= size;
 299                 host->size -= size;
 300                 while (size) {
 301                         data >>= 8;
 302                         data |= (u32)*buffer << 24;
 303                         buffer++;
 304                         size--;
 305                 }
 306
 307                 if (chunk_remain == 0) {
 308                         writel(data, host->ioaddr + SDHCI_BUFFER);
 309                         chunk_remain = min(blksize, 4);
 310                 }
 311
 312                 if (host->remain == 0) {
 313                         if (sdhci_next_sg(host) == 0) {
 314                                 BUG_ON(blksize != 0);
 315                                 return;
 316                         }
 317                         buffer = sdhci_sg_to_buffer(host);
 318                 }
 319         }
 320 }
 321
 322 static void sdhci_transfer_pio(struct sdhci_host *host)
 323 {
 324         u32 mask;
 325
 326         BUG_ON(!host->data);
 327
 328         if (host->size == 0)
 329                 return;
 330
 331         if (host->data->flags & MMC_DATA_READ)
 332                 mask = SDHCI_DATA_AVAILABLE;
 333         else
 334                 mask = SDHCI_SPACE_AVAILABLE;
 335
 336         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 337                 if (host->data->flags & MMC_DATA_READ)
 338                         sdhci_read_block_pio(host);
 339                 else
 340                         sdhci_write_block_pio(host);
 341
 342                 if (host->size == 0)
 343                         break;
 344
 345                 BUG_ON(host->num_sg == 0);
 346         }
 347
 348         DBG("PIO transfer complete.\n");
 349 }
 350
 351 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 352 {
 353         u8 count;
 354         unsigned target_timeout, current_timeout;
 355
 356         WARN_ON(host->data);
 357
 358         if (data == NULL)
 359                 return;
 360
 361         DBG("blksz %04x blks %04x flags %08x\n",
 362                 data->blksz, data->blocks, data->flags);
 363         DBG("tsac %d ms nsac %d clk\n",
 364                 data->timeout_ns / 1000000, data->timeout_clks);
 365
 366         /* Sanity checks */
 367         BUG_ON(data->blksz * data->blocks > 524288);
 368         BUG_ON(data->blksz > host->mmc->max_blk_size);
 369         BUG_ON(data->blocks > 65535);
 370
 371         /* timeout in us */
 372         target_timeout = data->timeout_ns / 1000 +
 373                 data->timeout_clks / host->clock;
 374
 375         /*
 376          * Figure out needed cycles.
 377          * We do this in steps in order to fit inside a 32 bit int.
 378          * The first step is the minimum timeout, which will have a
 379          * minimum resolution of 6 bits:
 380          * (1) 2^13*1000 > 2^22,
 381          * (2) host->timeout_clk < 2^16
 382          *     =>
 383          *     (1) / (2) > 2^6
 384          */
 385         count = 0;
 386         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 387         while (current_timeout < target_timeout) {
 388                 count++;
 389                 current_timeout <<= 1;
 390                 if (count >= 0xF)
 391                         break;
 392         }
 393
 394         if (count >= 0xF) {
 395                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 396                         mmc_hostname(host->mmc));
 397                 count = 0xE;
 398         }
 399
 400         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 401
 402         if (host->flags & SDHCI_USE_DMA) {
 403                 int count;
 404
 405                 count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
 406                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 407                 BUG_ON(count != 1);
 408
 409                 writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
 410         } else {
 411                 host->size = data->blksz * data->blocks;
 412
 413                 host->cur_sg = data->sg;
 414                 host->num_sg = data->sg_len;
 415
 416                 host->offset = 0;
 417                 host->remain = host->cur_sg->length;
 418         }
 419
 420         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 421         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 422                 host->ioaddr + SDHCI_BLOCK_SIZE);
 423         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 424 }
 425
 426 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 427         struct mmc_data *data)
 428 {
 429         u16 mode;
 430
 431         WARN_ON(host->data);
 432
 433         if (data == NULL)
 434                 return;
 435
 436         mode = SDHCI_TRNS_BLK_CNT_EN;
 437         if (data->blocks > 1)
 438                 mode |= SDHCI_TRNS_MULTI;
 439         if (data->flags & MMC_DATA_READ)
 440                 mode |= SDHCI_TRNS_READ;
 441         if (host->flags & SDHCI_USE_DMA)
 442                 mode |= SDHCI_TRNS_DMA;
 443
 444         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 445 }
 446
 447 static void sdhci_finish_data(struct sdhci_host *host)
 448 {
 449         struct mmc_data *data;
 450         u16 blocks;
 451
 452         BUG_ON(!host->data);
 453
 454         data = host->data;
 455         host->data = NULL;
 456
 457         if (host->flags & SDHCI_USE_DMA) {
 458                 pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
 459                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 460         }
 461
 462         /*
 463          * Controller doesn't count down when in single block mode.
 464          */
 465         if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
 466                 blocks = 0;
 467         else
 468                 blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
 469         data->bytes_xfered = data->blksz * (data->blocks - blocks);
 470
 471         if ((data->error == MMC_ERR_NONE) && blocks) {
 472                 printk(KERN_ERR "%s: Controller signalled completion even "
 473                         "though there were blocks left.\n",
 474                         mmc_hostname(host->mmc));
 475                 data->error = MMC_ERR_FAILED;
 476         } else if (host->size != 0) {
 477                 printk(KERN_ERR "%s: %d bytes were left untransferred.\n",
 478                         mmc_hostname(host->mmc), host->size);
 479                 data->error = MMC_ERR_FAILED;
 480         }
 481
 482         DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 483
 484         if (data->stop) {
 485                 /*
 486                  * The controller needs a reset of internal state machines
 487                  * upon error conditions.
 488                  */
 489                 if (data->error != MMC_ERR_NONE) {
 490                         sdhci_reset(host, SDHCI_RESET_CMD);
 491                         sdhci_reset(host, SDHCI_RESET_DATA);
 492                 }
 493
 494                 sdhci_send_command(host, data->stop);
 495         } else
 496                 tasklet_schedule(&host->finish_tasklet);
 497 }
 498
 499 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 500 {
 501         int flags;
 502         u32 mask;
 503         unsigned long timeout;
 504
 505         WARN_ON(host->cmd);
 506
 507         DBG("Sending cmd (%x)\n", cmd->opcode);
 508
 509         /* Wait max 10 ms */
 510         timeout = 10;
 511
 512         mask = SDHCI_CMD_INHIBIT;
 513         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 514                 mask |= SDHCI_DATA_INHIBIT;
 515
 516         /* We shouldn't wait for data inihibit for stop commands, even
 517            though they might use busy signaling */
 518         if (host->mrq->data && (cmd == host->mrq->data->stop))
 519                 mask &= ~SDHCI_DATA_INHIBIT;
 520
 521         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 522                 if (timeout == 0) {
 523                         printk(KERN_ERR "%s: Controller never released "
 524                                 "inhibit bit(s).\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!\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 "
 636                                 "stabilised.\n", mmc_hostname(host->mmc));
 637                         sdhci_dumpregs(host);
 638                         return;
 639                 }
 640                 timeout--;
 641                 mdelay(1);
 642         }
 643
 644         clk |= SDHCI_CLOCK_CARD_EN;
 645         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 646
 647 out:
 648         host->clock = clock;
 649 }
 650
 651 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 652 {
 653         u8 pwr;
 654
 655         if (host->power == power)
 656                 return;
 657
 658         if (power == (unsigned short)-1) {
 659                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 660                 goto out;
 661         }
 662
 663         /*
 664          * Spec says that we should clear the power reg before setting
 665          * a new value. Some controllers don't seem to like this though.
 666          */
 667         if (!(host->chip->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
 668                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 669
 670         pwr = SDHCI_POWER_ON;
 671
 672         switch (power) {
 673         case MMC_VDD_170:
 674         case MMC_VDD_180:
 675         case MMC_VDD_190:
 676                 pwr |= SDHCI_POWER_180;
 677                 break;
 678         case MMC_VDD_290:
 679         case MMC_VDD_300:
 680         case MMC_VDD_310:
 681                 pwr |= SDHCI_POWER_300;
 682                 break;
 683         case MMC_VDD_320:
 684         case MMC_VDD_330:
 685         case MMC_VDD_340:
 686                 pwr |= SDHCI_POWER_330;
 687                 break;
 688         default:
 689                 BUG();
 690         }
 691
 692         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 693
 694 out:
 695         host->power = power;
 696 }
 697
 698 /*****************************************************************************\
 699  *                                                                           *
 700  * MMC callbacks                                                             *
 701  *                                                                           *
 702 \*****************************************************************************/
 703
 704 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 705 {
 706         struct sdhci_host *host;
 707         unsigned long flags;
 708
 709         host = mmc_priv(mmc);
 710
 711         spin_lock_irqsave(&host->lock, flags);
 712
 713         WARN_ON(host->mrq != NULL);
 714
 715         sdhci_activate_led(host);
 716
 717         host->mrq = mrq;
 718
 719         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 720                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 721                 tasklet_schedule(&host->finish_tasklet);
 722         } else
 723                 sdhci_send_command(host, mrq->cmd);
 724
 725         mmiowb();
 726         spin_unlock_irqrestore(&host->lock, flags);
 727 }
 728
 729 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 730 {
 731         struct sdhci_host *host;
 732         unsigned long flags;
 733         u8 ctrl;
 734
 735         host = mmc_priv(mmc);
 736
 737         spin_lock_irqsave(&host->lock, flags);
 738
 739         /*
 740          * Reset the chip on each power off.
 741          * Should clear out any weird states.
 742          */
 743         if (ios->power_mode == MMC_POWER_OFF) {
 744                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 745                 sdhci_init(host);
 746         }
 747
 748         sdhci_set_clock(host, ios->clock);
 749
 750         if (ios->power_mode == MMC_POWER_OFF)
 751                 sdhci_set_power(host, -1);
 752         else
 753                 sdhci_set_power(host, ios->vdd);
 754
 755         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 756
 757         if (ios->bus_width == MMC_BUS_WIDTH_4)
 758                 ctrl |= SDHCI_CTRL_4BITBUS;
 759         else
 760                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 761
 762         if (ios->timing == MMC_TIMING_SD_HS)
 763                 ctrl |= SDHCI_CTRL_HISPD;
 764         else
 765                 ctrl &= ~SDHCI_CTRL_HISPD;
 766
 767         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 768
 769         mmiowb();
 770         spin_unlock_irqrestore(&host->lock, flags);
 771 }
 772
 773 static int sdhci_get_ro(struct mmc_host *mmc)
 774 {
 775         struct sdhci_host *host;
 776         unsigned long flags;
 777         int present;
 778
 779         host = mmc_priv(mmc);
 780
 781         spin_lock_irqsave(&host->lock, flags);
 782
 783         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 784
 785         spin_unlock_irqrestore(&host->lock, flags);
 786
 787         return !(present & SDHCI_WRITE_PROTECT);
 788 }
 789
 790 static const struct mmc_host_ops sdhci_ops = {
 791         .request        = sdhci_request,
 792         .set_ios        = sdhci_set_ios,
 793         .get_ro         = sdhci_get_ro,
 794 };
 795
 796 /*****************************************************************************\
 797  *                                                                           *
 798  * Tasklets                                                                  *
 799  *                                                                           *
 800 \*****************************************************************************/
 801
 802 static void sdhci_tasklet_card(unsigned long param)
 803 {
 804         struct sdhci_host *host;
 805         unsigned long flags;
 806
 807         host = (struct sdhci_host*)param;
 808
 809         spin_lock_irqsave(&host->lock, flags);
 810
 811         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 812                 if (host->mrq) {
 813                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 814                                 mmc_hostname(host->mmc));
 815                         printk(KERN_ERR "%s: Resetting controller.\n",
 816                                 mmc_hostname(host->mmc));
 817
 818                         sdhci_reset(host, SDHCI_RESET_CMD);
 819                         sdhci_reset(host, SDHCI_RESET_DATA);
 820
 821                         host->mrq->cmd->error = MMC_ERR_FAILED;
 822                         tasklet_schedule(&host->finish_tasklet);
 823                 }
 824         }
 825
 826         spin_unlock_irqrestore(&host->lock, flags);
 827
 828         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 829 }
 830
 831 static void sdhci_tasklet_finish(unsigned long param)
 832 {
 833         struct sdhci_host *host;
 834         unsigned long flags;
 835         struct mmc_request *mrq;
 836
 837         host = (struct sdhci_host*)param;
 838
 839         spin_lock_irqsave(&host->lock, flags);
 840
 841         del_timer(&host->timer);
 842
 843         mrq = host->mrq;
 844
 845         DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 846
 847         /*
 848          * The controller needs a reset of internal state machines
 849          * upon error conditions.
 850          */
 851         if ((mrq->cmd->error != MMC_ERR_NONE) ||
 852                 (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
 853                 (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
 854
 855                 /* Some controllers need this kick or reset won't work here */
 856                 if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 857                         unsigned int clock;
 858
 859                         /* This is to force an update */
 860                         clock = host->clock;
 861                         host->clock = 0;
 862                         sdhci_set_clock(host, clock);
 863                 }
 864
 865                 /* Spec says we should do both at the same time, but Ricoh
 866                    controllers do not like that. */
 867                 sdhci_reset(host, SDHCI_RESET_CMD);
 868                 sdhci_reset(host, SDHCI_RESET_DATA);
 869         }
 870
 871         host->mrq = NULL;
 872         host->cmd = NULL;
 873         host->data = NULL;
 874
 875         sdhci_deactivate_led(host);
 876
 877         mmiowb();
 878         spin_unlock_irqrestore(&host->lock, flags);
 879
 880         mmc_request_done(host->mmc, mrq);
 881 }
 882
 883 static void sdhci_timeout_timer(unsigned long data)
 884 {
 885         struct sdhci_host *host;
 886         unsigned long flags;
 887
 888         host = (struct sdhci_host*)data;
 889
 890         spin_lock_irqsave(&host->lock, flags);
 891
 892         if (host->mrq) {
 893                 printk(KERN_ERR "%s: Timeout waiting for hardware "
 894                         "interrupt.\n", mmc_hostname(host->mmc));
 895                 sdhci_dumpregs(host);
 896
 897                 if (host->data) {
 898                         host->data->error = MMC_ERR_TIMEOUT;
 899                         sdhci_finish_data(host);
 900                 } else {
 901                         if (host->cmd)
 902                                 host->cmd->error = MMC_ERR_TIMEOUT;
 903                         else
 904                                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 905
 906                         tasklet_schedule(&host->finish_tasklet);
 907                 }
 908         }
 909
 910         mmiowb();
 911         spin_unlock_irqrestore(&host->lock, flags);
 912 }
 913
 914 /*****************************************************************************\
 915  *                                                                           *
 916  * Interrupt handling                                                        *
 917  *                                                                           *
 918 \*****************************************************************************/
 919
 920 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 921 {
 922         BUG_ON(intmask == 0);
 923
 924         if (!host->cmd) {
 925                 printk(KERN_ERR "%s: Got command interrupt even though no "
 926                         "command operation was in progress.\n",
 927                         mmc_hostname(host->mmc));
 928                 sdhci_dumpregs(host);
 929                 return;
 930         }
 931
 932         if (intmask & SDHCI_INT_RESPONSE)
 933                 sdhci_finish_command(host);
 934         else {
 935                 if (intmask & SDHCI_INT_TIMEOUT)
 936                         host->cmd->error = MMC_ERR_TIMEOUT;
 937                 else if (intmask & SDHCI_INT_CRC)
 938                         host->cmd->error = MMC_ERR_BADCRC;
 939                 else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
 940                         host->cmd->error = MMC_ERR_FAILED;
 941                 else
 942                         host->cmd->error = MMC_ERR_INVALID;
 943
 944                 tasklet_schedule(&host->finish_tasklet);
 945         }
 946 }
 947
 948 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 949 {
 950         BUG_ON(intmask == 0);
 951
 952         if (!host->data) {
 953                 /*
 954                  * A data end interrupt is sent together with the response
 955                  * for the stop command.
 956                  */
 957                 if (intmask & SDHCI_INT_DATA_END)
 958                         return;
 959
 960                 printk(KERN_ERR "%s: Got data interrupt even though no "
 961                         "data operation was in progress.\n",
 962                         mmc_hostname(host->mmc));
 963                 sdhci_dumpregs(host);
 964
 965                 return;
 966         }
 967
 968         if (intmask & SDHCI_INT_DATA_TIMEOUT)
 969                 host->data->error = MMC_ERR_TIMEOUT;
 970         else if (intmask & SDHCI_INT_DATA_CRC)
 971                 host->data->error = MMC_ERR_BADCRC;
 972         else if (intmask & SDHCI_INT_DATA_END_BIT)
 973                 host->data->error = MMC_ERR_FAILED;
 974
 975         if (host->data->error != MMC_ERR_NONE)
 976                 sdhci_finish_data(host);
 977         else {
 978                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
 979                         sdhci_transfer_pio(host);
 980
 981                 if (intmask & SDHCI_INT_DATA_END)
 982                         sdhci_finish_data(host);
 983         }
 984 }
 985
 986 static irqreturn_t sdhci_irq(int irq, void *dev_id)
 987 {
 988         irqreturn_t result;
 989         struct sdhci_host* host = dev_id;
 990         u32 intmask;
 991
 992         spin_lock(&host->lock);
 993
 994         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
 995
 996         if (!intmask || intmask == 0xffffffff) {
 997                 result = IRQ_NONE;
 998                 goto out;
 999         }
1000
1001         DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
1002
1003         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1004                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1005                         host->ioaddr + SDHCI_INT_STATUS);
1006                 tasklet_schedule(&host->card_tasklet);
1007         }
1008
1009         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1010
1011         if (intmask & SDHCI_INT_CMD_MASK) {
1012                 writel(intmask & SDHCI_INT_CMD_MASK,
1013                         host->ioaddr + SDHCI_INT_STATUS);
1014                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1015         }
1016
1017         if (intmask & SDHCI_INT_DATA_MASK) {
1018                 writel(intmask & SDHCI_INT_DATA_MASK,
1019                         host->ioaddr + SDHCI_INT_STATUS);
1020                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1021         }
1022
1023         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1024
1025         if (intmask & SDHCI_INT_BUS_POWER) {
1026                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1027                         mmc_hostname(host->mmc));
1028                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1029         }
1030
1031         intmask &= SDHCI_INT_BUS_POWER;
1032
1033         if (intmask) {
1034                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1035                         mmc_hostname(host->mmc), intmask);
1036                 sdhci_dumpregs(host);
1037
1038                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1039         }
1040
1041         result = IRQ_HANDLED;
1042
1043         mmiowb();
1044 out:
1045         spin_unlock(&host->lock);
1046
1047         return result;
1048 }
1049
1050 /*****************************************************************************\
1051  *                                                                           *
1052  * Suspend/resume                                                            *
1053  *                                                                           *
1054 \*****************************************************************************/
1055
1056 #ifdef CONFIG_PM
1057
1058 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
1059 {
1060         struct sdhci_chip *chip;
1061         int i, ret;
1062
1063         chip = pci_get_drvdata(pdev);
1064         if (!chip)
1065                 return 0;
1066
1067         DBG("Suspending...\n");
1068
1069         for (i = 0;i < chip->num_slots;i++) {
1070                 if (!chip->hosts[i])
1071                         continue;
1072                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
1073                 if (ret) {
1074                         for (i--;i >= 0;i--)
1075                                 mmc_resume_host(chip->hosts[i]->mmc);
1076                         return ret;
1077                 }
1078         }
1079
1080         pci_save_state(pdev);
1081         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
1082
1083         for (i = 0;i < chip->num_slots;i++) {
1084                 if (!chip->hosts[i])
1085                         continue;
1086                 free_irq(chip->hosts[i]->irq, chip->hosts[i]);
1087         }
1088
1089         pci_disable_device(pdev);
1090         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1091
1092         return 0;
1093 }
1094
1095 static int sdhci_resume (struct pci_dev *pdev)
1096 {
1097         struct sdhci_chip *chip;
1098         int i, ret;
1099
1100         chip = pci_get_drvdata(pdev);
1101         if (!chip)
1102                 return 0;
1103
1104         DBG("Resuming...\n");
1105
1106         pci_set_power_state(pdev, PCI_D0);
1107         pci_restore_state(pdev);
1108         ret = pci_enable_device(pdev);
1109         if (ret)
1110                 return ret;
1111
1112         for (i = 0;i < chip->num_slots;i++) {
1113                 if (!chip->hosts[i])
1114                         continue;
1115                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
1116                         pci_set_master(pdev);
1117                 ret = request_irq(chip->hosts[i]->irq, sdhci_irq,
1118                         IRQF_SHARED, chip->hosts[i]->slot_descr,
1119                         chip->hosts[i]);
1120                 if (ret)
1121                         return ret;
1122                 sdhci_init(chip->hosts[i]);
1123                 mmiowb();
1124                 ret = mmc_resume_host(chip->hosts[i]->mmc);
1125                 if (ret)
1126                         return ret;
1127         }
1128
1129         return 0;
1130 }
1131
1132 #else /* CONFIG_PM */
1133
1134 #define sdhci_suspend NULL
1135 #define sdhci_resume NULL
1136
1137 #endif /* CONFIG_PM */
1138
1139 /*****************************************************************************\
1140  *                                                                           *
1141  * Device probing/removal                                                    *
1142  *                                                                           *
1143 \*****************************************************************************/
1144
1145 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
1146 {
1147         int ret;
1148         unsigned int version;
1149         struct sdhci_chip *chip;
1150         struct mmc_host *mmc;
1151         struct sdhci_host *host;
1152
1153         u8 first_bar;
1154         unsigned int caps;
1155
1156         chip = pci_get_drvdata(pdev);
1157         BUG_ON(!chip);
1158
1159         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
1160         if (ret)
1161                 return ret;
1162
1163         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
1164
1165         if (first_bar > 5) {
1166                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
1167                 return -ENODEV;
1168         }
1169
1170         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
1171                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
1172                 return -ENODEV;
1173         }
1174
1175         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
1176                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. "
1177                         "You may experience problems.\n");
1178         }
1179
1180         if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
1181                 printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
1182                 return -ENODEV;
1183         }
1184
1185         if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
1186                 printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
1187                 return -ENODEV;
1188         }
1189
1190         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
1191         if (!mmc)
1192                 return -ENOMEM;
1193
1194         host = mmc_priv(mmc);
1195         host->mmc = mmc;
1196
1197         host->chip = chip;
1198         chip->hosts[slot] = host;
1199
1200         host->bar = first_bar + slot;
1201
1202         host->addr = pci_resource_start(pdev, host->bar);
1203         host->irq = pdev->irq;
1204
1205         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1206
1207         snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
1208
1209         ret = pci_request_region(pdev, host->bar, host->slot_descr);
1210         if (ret)
1211                 goto free;
1212
1213         host->ioaddr = ioremap_nocache(host->addr,
1214                 pci_resource_len(pdev, host->bar));
1215         if (!host->ioaddr) {
1216                 ret = -ENOMEM;
1217                 goto release;
1218         }
1219
1220         sdhci_reset(host, SDHCI_RESET_ALL);
1221
1222         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1223         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1224         if (version != 0) {
1225                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1226                         "You may experience problems.\n", host->slot_descr,
1227                         version);
1228         }
1229
1230         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1231
1232         if (debug_nodma)
1233                 DBG("DMA forced off\n");
1234         else if (debug_forcedma) {
1235                 DBG("DMA forced on\n");
1236                 host->flags |= SDHCI_USE_DMA;
1237         } else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
1238                 host->flags |= SDHCI_USE_DMA;
1239         else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
1240                 DBG("Controller doesn't have DMA interface\n");
1241         else if (!(caps & SDHCI_CAN_DO_DMA))
1242                 DBG("Controller doesn't have DMA capability\n");
1243         else
1244                 host->flags |= SDHCI_USE_DMA;
1245
1246         if (host->flags & SDHCI_USE_DMA) {
1247                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1248                         printk(KERN_WARNING "%s: No suitable DMA available. "
1249                                 "Falling back to PIO.\n", host->slot_descr);
1250                         host->flags &= ~SDHCI_USE_DMA;
1251                 }
1252         }
1253
1254         if (host->flags & SDHCI_USE_DMA)
1255                 pci_set_master(pdev);
1256         else /* XXX: Hack to get MMC layer to avoid highmem */
1257                 pdev->dma_mask = 0;
1258
1259         host->max_clk =
1260                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1261         if (host->max_clk == 0) {
1262                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1263                         "frequency.\n", host->slot_descr);
1264                 ret = -ENODEV;
1265                 goto unmap;
1266         }
1267         host->max_clk *= 1000000;
1268
1269         host->timeout_clk =
1270                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1271         if (host->timeout_clk == 0) {
1272                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1273                         "frequency.\n", host->slot_descr);
1274                 ret = -ENODEV;
1275                 goto unmap;
1276         }
1277         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1278                 host->timeout_clk *= 1000;
1279
1280         /*
1281          * Set host parameters.
1282          */
1283         mmc->ops = &sdhci_ops;
1284         mmc->f_min = host->max_clk / 256;
1285         mmc->f_max = host->max_clk;
1286         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1287
1288         if (caps & SDHCI_CAN_DO_HISPD)
1289                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1290
1291         mmc->ocr_avail = 0;
1292         if (caps & SDHCI_CAN_VDD_330)
1293                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1294         if (caps & SDHCI_CAN_VDD_300)
1295                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1296         if (caps & SDHCI_CAN_VDD_180)
1297                 mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
1298
1299         if (mmc->ocr_avail == 0) {
1300                 printk(KERN_ERR "%s: Hardware doesn't report any "
1301                         "support voltages.\n", host->slot_descr);
1302                 ret = -ENODEV;
1303                 goto unmap;
1304         }
1305
1306         spin_lock_init(&host->lock);
1307
1308         /*
1309          * Maximum number of segments. Hardware cannot do scatter lists.
1310          */
1311         if (host->flags & SDHCI_USE_DMA)
1312                 mmc->max_hw_segs = 1;
1313         else
1314                 mmc->max_hw_segs = 16;
1315         mmc->max_phys_segs = 16;
1316
1317         /*
1318          * Maximum number of sectors in one transfer. Limited by DMA boundary
1319          * size (512KiB).
1320          */
1321         mmc->max_req_size = 524288;
1322
1323         /*
1324          * Maximum segment size. Could be one segment with the maximum number
1325          * of bytes.
1326          */
1327         mmc->max_seg_size = mmc->max_req_size;
1328
1329         /*
1330          * Maximum block size. This varies from controller to controller and
1331          * is specified in the capabilities register.
1332          */
1333         mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1334         if (mmc->max_blk_size >= 3) {
1335                 printk(KERN_ERR "%s: Invalid maximum block size.\n",
1336                         host->slot_descr);
1337                 ret = -ENODEV;
1338                 goto unmap;
1339         }
1340         mmc->max_blk_size = 512 << mmc->max_blk_size;
1341
1342         /*
1343          * Maximum block count.
1344          */
1345         mmc->max_blk_count = 65535;
1346
1347         /*
1348          * Init tasklets.
1349          */
1350         tasklet_init(&host->card_tasklet,
1351                 sdhci_tasklet_card, (unsigned long)host);
1352         tasklet_init(&host->finish_tasklet,
1353                 sdhci_tasklet_finish, (unsigned long)host);
1354
1355         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1356
1357         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1358                 host->slot_descr, host);
1359         if (ret)
1360                 goto untasklet;
1361
1362         sdhci_init(host);
1363
1364 #ifdef CONFIG_MMC_DEBUG
1365         sdhci_dumpregs(host);
1366 #endif
1367
1368         mmiowb();
1369
1370         mmc_add_host(mmc);
1371
1372         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
1373                 host->addr, host->irq,
1374                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1375
1376         return 0;
1377
1378 untasklet:
1379         tasklet_kill(&host->card_tasklet);
1380         tasklet_kill(&host->finish_tasklet);
1381 unmap:
1382         iounmap(host->ioaddr);
1383 release:
1384         pci_release_region(pdev, host->bar);
1385 free:
1386         mmc_free_host(mmc);
1387
1388         return ret;
1389 }
1390
1391 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1392 {
1393         struct sdhci_chip *chip;
1394         struct mmc_host *mmc;
1395         struct sdhci_host *host;
1396
1397         chip = pci_get_drvdata(pdev);
1398         host = chip->hosts[slot];
1399         mmc = host->mmc;
1400
1401         chip->hosts[slot] = NULL;
1402
1403         mmc_remove_host(mmc);
1404
1405         sdhci_reset(host, SDHCI_RESET_ALL);
1406
1407         free_irq(host->irq, host);
1408
1409         del_timer_sync(&host->timer);
1410
1411         tasklet_kill(&host->card_tasklet);
1412         tasklet_kill(&host->finish_tasklet);
1413
1414         iounmap(host->ioaddr);
1415
1416         pci_release_region(pdev, host->bar);
1417
1418         mmc_free_host(mmc);
1419 }
1420
1421 static int __devinit sdhci_probe(struct pci_dev *pdev,
1422         const struct pci_device_id *ent)
1423 {
1424         int ret, i;
1425         u8 slots, rev;
1426         struct sdhci_chip *chip;
1427
1428         BUG_ON(pdev == NULL);
1429         BUG_ON(ent == NULL);
1430
1431         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
1432
1433         printk(KERN_INFO DRIVER_NAME
1434                 ": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
1435                 pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
1436                 (int)rev);
1437
1438         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1439         if (ret)
1440                 return ret;
1441
1442         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1443         DBG("found %d slot(s)\n", slots);
1444         if (slots == 0)
1445                 return -ENODEV;
1446
1447         ret = pci_enable_device(pdev);
1448         if (ret)
1449                 return ret;
1450
1451         chip = kzalloc(sizeof(struct sdhci_chip) +
1452                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1453         if (!chip) {
1454                 ret = -ENOMEM;
1455                 goto err;
1456         }
1457
1458         chip->pdev = pdev;
1459         chip->quirks = ent->driver_data;
1460
1461         if (debug_quirks)
1462                 chip->quirks = debug_quirks;
1463
1464         chip->num_slots = slots;
1465         pci_set_drvdata(pdev, chip);
1466
1467         for (i = 0;i < slots;i++) {
1468                 ret = sdhci_probe_slot(pdev, i);
1469                 if (ret) {
1470                         for (i--;i >= 0;i--)
1471                                 sdhci_remove_slot(pdev, i);
1472                         goto free;
1473                 }
1474         }
1475
1476         return 0;
1477
1478 free:
1479         pci_set_drvdata(pdev, NULL);
1480         kfree(chip);
1481
1482 err:
1483         pci_disable_device(pdev);
1484         return ret;
1485 }
1486
1487 static void __devexit sdhci_remove(struct pci_dev *pdev)
1488 {
1489         int i;
1490         struct sdhci_chip *chip;
1491
1492         chip = pci_get_drvdata(pdev);
1493
1494         if (chip) {
1495                 for (i = 0;i < chip->num_slots;i++)
1496                         sdhci_remove_slot(pdev, i);
1497
1498                 pci_set_drvdata(pdev, NULL);
1499
1500                 kfree(chip);
1501         }
1502
1503         pci_disable_device(pdev);
1504 }
1505
1506 static struct pci_driver sdhci_driver = {
1507         .name =         DRIVER_NAME,
1508         .id_table =     pci_ids,
1509         .probe =        sdhci_probe,
1510         .remove =       __devexit_p(sdhci_remove),
1511         .suspend =      sdhci_suspend,
1512         .resume =       sdhci_resume,
1513 };
1514
1515 /*****************************************************************************\
1516  *                                                                           *
1517  * Driver init/exit                                                          *
1518  *                                                                           *
1519 \*****************************************************************************/
1520
1521 static int __init sdhci_drv_init(void)
1522 {
1523         printk(KERN_INFO DRIVER_NAME
1524                 ": Secure Digital Host Controller Interface driver\n");
1525         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1526
1527         return pci_register_driver(&sdhci_driver);
1528 }
1529
1530 static void __exit sdhci_drv_exit(void)
1531 {
1532         DBG("Exiting\n");
1533
1534         pci_unregister_driver(&sdhci_driver);
1535 }
1536
1537 module_init(sdhci_drv_init);
1538 module_exit(sdhci_drv_exit);
1539
1540 module_param(debug_nodma, uint, 0444);
1541 module_param(debug_forcedma, uint, 0444);
1542 module_param(debug_quirks, uint, 0444);
1543
1544 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1545 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1546 MODULE_LICENSE("GPL");
1547
1548 MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
1549 MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
1550 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");