git.oblomov.eu Git - linux-2.6/blob - drivers/mmc/host/sdhci.c

   1 /*
   2  *  linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
   3  *
   4  *  Copyright (C) 2005-2008 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  * Thanks to the following companies for their support:
  12  *
  13  *     - JMicron (hardware and technical support)
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/highmem.h>
  18 #include <linux/pci.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include <linux/leds.h>
  23
  24 #include <linux/mmc/host.h>
  25
  26 #include "sdhci.h"
  27
  28 #define DRIVER_NAME "sdhci"
  29
  30 #define DBG(f, x...) \
  31         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  32
  33 static unsigned int debug_quirks = 0;
  34
  35 /*
  36  * Different quirks to handle when the hardware deviates from a strict
  37  * interpretation of the SDHCI specification.
  38  */
  39
  40 /* Controller doesn't honor resets unless we touch the clock register */
  41 #define SDHCI_QUIRK_CLOCK_BEFORE_RESET                  (1<<0)
  42 /* Controller has bad caps bits, but really supports DMA */
  43 #define SDHCI_QUIRK_FORCE_DMA                           (1<<1)
  44 /* Controller doesn't like to be reset when there is no card inserted. */
  45 #define SDHCI_QUIRK_NO_CARD_NO_RESET                    (1<<2)
  46 /* Controller doesn't like clearing the power reg before a change */
  47 #define SDHCI_QUIRK_SINGLE_POWER_WRITE                  (1<<3)
  48 /* Controller has flaky internal state so reset it on each ios change */
  49 #define SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS               (1<<4)
  50 /* Controller has an unusable DMA engine */
  51 #define SDHCI_QUIRK_BROKEN_DMA                          (1<<5)
  52 /* Controller can only DMA from 32-bit aligned addresses */
  53 #define SDHCI_QUIRK_32BIT_DMA_ADDR                      (1<<6)
  54 /* Controller can only DMA chunk sizes that are a multiple of 32 bits */
  55 #define SDHCI_QUIRK_32BIT_DMA_SIZE                      (1<<7)
  56 /* Controller needs to be reset after each request to stay stable */
  57 #define SDHCI_QUIRK_RESET_AFTER_REQUEST                 (1<<8)
  58
  59 static const struct pci_device_id pci_ids[] __devinitdata = {
  60         {
  61                 .vendor         = PCI_VENDOR_ID_RICOH,
  62                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  63                 .subvendor      = PCI_VENDOR_ID_IBM,
  64                 .subdevice      = PCI_ANY_ID,
  65                 .driver_data    = SDHCI_QUIRK_CLOCK_BEFORE_RESET |
  66                                   SDHCI_QUIRK_FORCE_DMA,
  67         },
  68
  69         {
  70                 .vendor         = PCI_VENDOR_ID_RICOH,
  71                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  72                 .subvendor      = PCI_VENDOR_ID_SAMSUNG,
  73                 .subdevice      = PCI_ANY_ID,
  74                 .driver_data    = SDHCI_QUIRK_FORCE_DMA |
  75                                   SDHCI_QUIRK_NO_CARD_NO_RESET,
  76         },
  77
  78         {
  79                 .vendor         = PCI_VENDOR_ID_RICOH,
  80                 .device         = PCI_DEVICE_ID_RICOH_R5C822,
  81                 .subvendor      = PCI_ANY_ID,
  82                 .subdevice      = PCI_ANY_ID,
  83                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
  84         },
  85
  86         {
  87                 .vendor         = PCI_VENDOR_ID_TI,
  88                 .device         = PCI_DEVICE_ID_TI_XX21_XX11_SD,
  89                 .subvendor      = PCI_ANY_ID,
  90                 .subdevice      = PCI_ANY_ID,
  91                 .driver_data    = SDHCI_QUIRK_FORCE_DMA,
  92         },
  93
  94         {
  95                 .vendor         = PCI_VENDOR_ID_ENE,
  96                 .device         = PCI_DEVICE_ID_ENE_CB712_SD,
  97                 .subvendor      = PCI_ANY_ID,
  98                 .subdevice      = PCI_ANY_ID,
  99                 .driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE |
 100                                   SDHCI_QUIRK_BROKEN_DMA,
 101         },
 102
 103         {
 104                 .vendor         = PCI_VENDOR_ID_ENE,
 105                 .device         = PCI_DEVICE_ID_ENE_CB712_SD_2,
 106                 .subvendor      = PCI_ANY_ID,
 107                 .subdevice      = PCI_ANY_ID,
 108                 .driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE |
 109                                   SDHCI_QUIRK_BROKEN_DMA,
 110         },
 111
 112         {
 113                 .vendor         = PCI_VENDOR_ID_ENE,
 114                 .device         = PCI_DEVICE_ID_ENE_CB714_SD,
 115                 .subvendor      = PCI_ANY_ID,
 116                 .subdevice      = PCI_ANY_ID,
 117                 .driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE |
 118                                   SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS,
 119         },
 120
 121         {
 122                 .vendor         = PCI_VENDOR_ID_ENE,
 123                 .device         = PCI_DEVICE_ID_ENE_CB714_SD_2,
 124                 .subvendor      = PCI_ANY_ID,
 125                 .subdevice      = PCI_ANY_ID,
 126                 .driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE |
 127                                   SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS,
 128         },
 129
 130         {
 131                 .vendor         = PCI_VENDOR_ID_JMICRON,
 132                 .device         = PCI_DEVICE_ID_JMICRON_JMB38X_SD,
 133                 .subvendor      = PCI_ANY_ID,
 134                 .subdevice      = PCI_ANY_ID,
 135                 .driver_data    = SDHCI_QUIRK_32BIT_DMA_ADDR |
 136                                   SDHCI_QUIRK_32BIT_DMA_SIZE |
 137                                   SDHCI_QUIRK_RESET_AFTER_REQUEST,
 138         },
 139
 140         {       /* Generic SD host controller */
 141                 PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
 142         },
 143
 144         { /* end: all zeroes */ },
 145 };
 146
 147 MODULE_DEVICE_TABLE(pci, pci_ids);
 148
 149 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
 150 static void sdhci_finish_data(struct sdhci_host *);
 151
 152 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
 153 static void sdhci_finish_command(struct sdhci_host *);
 154
 155 static void sdhci_dumpregs(struct sdhci_host *host)
 156 {
 157         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
 158
 159         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
 160                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
 161                 readw(host->ioaddr + SDHCI_HOST_VERSION));
 162         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
 163                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
 164                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
 165         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
 166                 readl(host->ioaddr + SDHCI_ARGUMENT),
 167                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
 168         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
 169                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
 170                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
 171         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
 172                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
 173                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
 174         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
 175                 readb(host->ioaddr + SDHCI_WAKE_UP_CONTROL),
 176                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
 177         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
 178                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
 179                 readl(host->ioaddr + SDHCI_INT_STATUS));
 180         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
 181                 readl(host->ioaddr + SDHCI_INT_ENABLE),
 182                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
 183         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
 184                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
 185                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
 186         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
 187                 readl(host->ioaddr + SDHCI_CAPABILITIES),
 188                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
 189
 190         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
 191 }
 192
 193 /*****************************************************************************\
 194  *                                                                           *
 195  * Low level functions                                                       *
 196  *                                                                           *
 197 \*****************************************************************************/
 198
 199 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 200 {
 201         unsigned long timeout;
 202
 203         if (host->chip->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 204                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
 205                         SDHCI_CARD_PRESENT))
 206                         return;
 207         }
 208
 209         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
 210
 211         if (mask & SDHCI_RESET_ALL)
 212                 host->clock = 0;
 213
 214         /* Wait max 100 ms */
 215         timeout = 100;
 216
 217         /* hw clears the bit when it's done */
 218         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
 219                 if (timeout == 0) {
 220                         printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
 221                                 mmc_hostname(host->mmc), (int)mask);
 222                         sdhci_dumpregs(host);
 223                         return;
 224                 }
 225                 timeout--;
 226                 mdelay(1);
 227         }
 228 }
 229
 230 static void sdhci_init(struct sdhci_host *host)
 231 {
 232         u32 intmask;
 233
 234         sdhci_reset(host, SDHCI_RESET_ALL);
 235
 236         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 237                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 238                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 239                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
 240                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
 241                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
 242
 243         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 244         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 245 }
 246
 247 static void sdhci_activate_led(struct sdhci_host *host)
 248 {
 249         u8 ctrl;
 250
 251         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 252         ctrl |= SDHCI_CTRL_LED;
 253         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 254 }
 255
 256 static void sdhci_deactivate_led(struct sdhci_host *host)
 257 {
 258         u8 ctrl;
 259
 260         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 261         ctrl &= ~SDHCI_CTRL_LED;
 262         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 263 }
 264
 265 #ifdef CONFIG_LEDS_CLASS
 266 static void sdhci_led_control(struct led_classdev *led,
 267         enum led_brightness brightness)
 268 {
 269         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 270         unsigned long flags;
 271
 272         spin_lock_irqsave(&host->lock, flags);
 273
 274         if (brightness == LED_OFF)
 275                 sdhci_deactivate_led(host);
 276         else
 277                 sdhci_activate_led(host);
 278
 279         spin_unlock_irqrestore(&host->lock, flags);
 280 }
 281 #endif
 282
 283 /*****************************************************************************\
 284  *                                                                           *
 285  * Core functions                                                            *
 286  *                                                                           *
 287 \*****************************************************************************/
 288
 289 static inline char* sdhci_sg_to_buffer(struct sdhci_host* host)
 290 {
 291         return sg_virt(host->cur_sg);
 292 }
 293
 294 static inline int sdhci_next_sg(struct sdhci_host* host)
 295 {
 296         /*
 297          * Skip to next SG entry.
 298          */
 299         host->cur_sg++;
 300         host->num_sg--;
 301
 302         /*
 303          * Any entries left?
 304          */
 305         if (host->num_sg > 0) {
 306                 host->offset = 0;
 307                 host->remain = host->cur_sg->length;
 308         }
 309
 310         return host->num_sg;
 311 }
 312
 313 static void sdhci_read_block_pio(struct sdhci_host *host)
 314 {
 315         int blksize, chunk_remain;
 316         u32 data;
 317         char *buffer;
 318         int size;
 319
 320         DBG("PIO reading\n");
 321
 322         blksize = host->data->blksz;
 323         chunk_remain = 0;
 324         data = 0;
 325
 326         buffer = sdhci_sg_to_buffer(host) + host->offset;
 327
 328         while (blksize) {
 329                 if (chunk_remain == 0) {
 330                         data = readl(host->ioaddr + SDHCI_BUFFER);
 331                         chunk_remain = min(blksize, 4);
 332                 }
 333
 334                 size = min(host->remain, chunk_remain);
 335
 336                 chunk_remain -= size;
 337                 blksize -= size;
 338                 host->offset += size;
 339                 host->remain -= size;
 340
 341                 while (size) {
 342                         *buffer = data & 0xFF;
 343                         buffer++;
 344                         data >>= 8;
 345                         size--;
 346                 }
 347
 348                 if (host->remain == 0) {
 349                         if (sdhci_next_sg(host) == 0) {
 350                                 BUG_ON(blksize != 0);
 351                                 return;
 352                         }
 353                         buffer = sdhci_sg_to_buffer(host);
 354                 }
 355         }
 356 }
 357
 358 static void sdhci_write_block_pio(struct sdhci_host *host)
 359 {
 360         int blksize, chunk_remain;
 361         u32 data;
 362         char *buffer;
 363         int bytes, size;
 364
 365         DBG("PIO writing\n");
 366
 367         blksize = host->data->blksz;
 368         chunk_remain = 4;
 369         data = 0;
 370
 371         bytes = 0;
 372         buffer = sdhci_sg_to_buffer(host) + host->offset;
 373
 374         while (blksize) {
 375                 size = min(host->remain, chunk_remain);
 376
 377                 chunk_remain -= size;
 378                 blksize -= size;
 379                 host->offset += size;
 380                 host->remain -= size;
 381
 382                 while (size) {
 383                         data >>= 8;
 384                         data |= (u32)*buffer << 24;
 385                         buffer++;
 386                         size--;
 387                 }
 388
 389                 if (chunk_remain == 0) {
 390                         writel(data, host->ioaddr + SDHCI_BUFFER);
 391                         chunk_remain = min(blksize, 4);
 392                 }
 393
 394                 if (host->remain == 0) {
 395                         if (sdhci_next_sg(host) == 0) {
 396                                 BUG_ON(blksize != 0);
 397                                 return;
 398                         }
 399                         buffer = sdhci_sg_to_buffer(host);
 400                 }
 401         }
 402 }
 403
 404 static void sdhci_transfer_pio(struct sdhci_host *host)
 405 {
 406         u32 mask;
 407
 408         BUG_ON(!host->data);
 409
 410         if (host->num_sg == 0)
 411                 return;
 412
 413         if (host->data->flags & MMC_DATA_READ)
 414                 mask = SDHCI_DATA_AVAILABLE;
 415         else
 416                 mask = SDHCI_SPACE_AVAILABLE;
 417
 418         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 419                 if (host->data->flags & MMC_DATA_READ)
 420                         sdhci_read_block_pio(host);
 421                 else
 422                         sdhci_write_block_pio(host);
 423
 424                 if (host->num_sg == 0)
 425                         break;
 426         }
 427
 428         DBG("PIO transfer complete.\n");
 429 }
 430
 431 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 432 {
 433         u8 count;
 434         unsigned target_timeout, current_timeout;
 435
 436         WARN_ON(host->data);
 437
 438         if (data == NULL)
 439                 return;
 440
 441         /* Sanity checks */
 442         BUG_ON(data->blksz * data->blocks > 524288);
 443         BUG_ON(data->blksz > host->mmc->max_blk_size);
 444         BUG_ON(data->blocks > 65535);
 445
 446         host->data = data;
 447         host->data_early = 0;
 448
 449         /* timeout in us */
 450         target_timeout = data->timeout_ns / 1000 +
 451                 data->timeout_clks / host->clock;
 452
 453         /*
 454          * Figure out needed cycles.
 455          * We do this in steps in order to fit inside a 32 bit int.
 456          * The first step is the minimum timeout, which will have a
 457          * minimum resolution of 6 bits:
 458          * (1) 2^13*1000 > 2^22,
 459          * (2) host->timeout_clk < 2^16
 460          *     =>
 461          *     (1) / (2) > 2^6
 462          */
 463         count = 0;
 464         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 465         while (current_timeout < target_timeout) {
 466                 count++;
 467                 current_timeout <<= 1;
 468                 if (count >= 0xF)
 469                         break;
 470         }
 471
 472         if (count >= 0xF) {
 473                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 474                         mmc_hostname(host->mmc));
 475                 count = 0xE;
 476         }
 477
 478         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 479
 480         if (host->flags & SDHCI_USE_DMA)
 481                 host->flags |= SDHCI_REQ_USE_DMA;
 482
 483         if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
 484                 (host->chip->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) &&
 485                 ((data->blksz * data->blocks) & 0x3))) {
 486                 DBG("Reverting to PIO because of transfer size (%d)\n",
 487                         data->blksz * data->blocks);
 488                 host->flags &= ~SDHCI_REQ_USE_DMA;
 489         }
 490
 491         /*
 492          * The assumption here being that alignment is the same after
 493          * translation to device address space.
 494          */
 495         if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
 496                 (host->chip->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 497                 (data->sg->offset & 0x3))) {
 498                 DBG("Reverting to PIO because of bad alignment\n");
 499                 host->flags &= ~SDHCI_REQ_USE_DMA;
 500         }
 501
 502         if (host->flags & SDHCI_REQ_USE_DMA) {
 503                 int count;
 504
 505                 count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
 506                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 507                 BUG_ON(count != 1);
 508
 509                 writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
 510         } else {
 511                 host->cur_sg = data->sg;
 512                 host->num_sg = data->sg_len;
 513
 514                 host->offset = 0;
 515                 host->remain = host->cur_sg->length;
 516         }
 517
 518         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 519         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 520                 host->ioaddr + SDHCI_BLOCK_SIZE);
 521         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 522 }
 523
 524 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 525         struct mmc_data *data)
 526 {
 527         u16 mode;
 528
 529         if (data == NULL)
 530                 return;
 531
 532         WARN_ON(!host->data);
 533
 534         mode = SDHCI_TRNS_BLK_CNT_EN;
 535         if (data->blocks > 1)
 536                 mode |= SDHCI_TRNS_MULTI;
 537         if (data->flags & MMC_DATA_READ)
 538                 mode |= SDHCI_TRNS_READ;
 539         if (host->flags & SDHCI_REQ_USE_DMA)
 540                 mode |= SDHCI_TRNS_DMA;
 541
 542         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 543 }
 544
 545 static void sdhci_finish_data(struct sdhci_host *host)
 546 {
 547         struct mmc_data *data;
 548         u16 blocks;
 549
 550         BUG_ON(!host->data);
 551
 552         data = host->data;
 553         host->data = NULL;
 554
 555         if (host->flags & SDHCI_REQ_USE_DMA) {
 556                 pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
 557                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 558         }
 559
 560         /*
 561          * Controller doesn't count down when in single block mode.
 562          */
 563         if (data->blocks == 1)
 564                 blocks = (data->error == 0) ? 0 : 1;
 565         else
 566                 blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
 567         data->bytes_xfered = data->blksz * (data->blocks - blocks);
 568
 569         if (!data->error && blocks) {
 570                 printk(KERN_ERR "%s: Controller signalled completion even "
 571                         "though there were blocks left.\n",
 572                         mmc_hostname(host->mmc));
 573                 data->error = -EIO;
 574         }
 575
 576         if (data->stop) {
 577                 /*
 578                  * The controller needs a reset of internal state machines
 579                  * upon error conditions.
 580                  */
 581                 if (data->error) {
 582                         sdhci_reset(host, SDHCI_RESET_CMD);
 583                         sdhci_reset(host, SDHCI_RESET_DATA);
 584                 }
 585
 586                 sdhci_send_command(host, data->stop);
 587         } else
 588                 tasklet_schedule(&host->finish_tasklet);
 589 }
 590
 591 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 592 {
 593         int flags;
 594         u32 mask;
 595         unsigned long timeout;
 596
 597         WARN_ON(host->cmd);
 598
 599         /* Wait max 10 ms */
 600         timeout = 10;
 601
 602         mask = SDHCI_CMD_INHIBIT;
 603         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 604                 mask |= SDHCI_DATA_INHIBIT;
 605
 606         /* We shouldn't wait for data inihibit for stop commands, even
 607            though they might use busy signaling */
 608         if (host->mrq->data && (cmd == host->mrq->data->stop))
 609                 mask &= ~SDHCI_DATA_INHIBIT;
 610
 611         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 612                 if (timeout == 0) {
 613                         printk(KERN_ERR "%s: Controller never released "
 614                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 615                         sdhci_dumpregs(host);
 616                         cmd->error = -EIO;
 617                         tasklet_schedule(&host->finish_tasklet);
 618                         return;
 619                 }
 620                 timeout--;
 621                 mdelay(1);
 622         }
 623
 624         mod_timer(&host->timer, jiffies + 10 * HZ);
 625
 626         host->cmd = cmd;
 627
 628         sdhci_prepare_data(host, cmd->data);
 629
 630         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 631
 632         sdhci_set_transfer_mode(host, cmd->data);
 633
 634         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 635                 printk(KERN_ERR "%s: Unsupported response type!\n",
 636                         mmc_hostname(host->mmc));
 637                 cmd->error = -EINVAL;
 638                 tasklet_schedule(&host->finish_tasklet);
 639                 return;
 640         }
 641
 642         if (!(cmd->flags & MMC_RSP_PRESENT))
 643                 flags = SDHCI_CMD_RESP_NONE;
 644         else if (cmd->flags & MMC_RSP_136)
 645                 flags = SDHCI_CMD_RESP_LONG;
 646         else if (cmd->flags & MMC_RSP_BUSY)
 647                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 648         else
 649                 flags = SDHCI_CMD_RESP_SHORT;
 650
 651         if (cmd->flags & MMC_RSP_CRC)
 652                 flags |= SDHCI_CMD_CRC;
 653         if (cmd->flags & MMC_RSP_OPCODE)
 654                 flags |= SDHCI_CMD_INDEX;
 655         if (cmd->data)
 656                 flags |= SDHCI_CMD_DATA;
 657
 658         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 659                 host->ioaddr + SDHCI_COMMAND);
 660 }
 661
 662 static void sdhci_finish_command(struct sdhci_host *host)
 663 {
 664         int i;
 665
 666         BUG_ON(host->cmd == NULL);
 667
 668         if (host->cmd->flags & MMC_RSP_PRESENT) {
 669                 if (host->cmd->flags & MMC_RSP_136) {
 670                         /* CRC is stripped so we need to do some shifting. */
 671                         for (i = 0;i < 4;i++) {
 672                                 host->cmd->resp[i] = readl(host->ioaddr +
 673                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 674                                 if (i != 3)
 675                                         host->cmd->resp[i] |=
 676                                                 readb(host->ioaddr +
 677                                                 SDHCI_RESPONSE + (3-i)*4-1);
 678                         }
 679                 } else {
 680                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 681                 }
 682         }
 683
 684         host->cmd->error = 0;
 685
 686         if (host->data && host->data_early)
 687                 sdhci_finish_data(host);
 688
 689         if (!host->cmd->data)
 690                 tasklet_schedule(&host->finish_tasklet);
 691
 692         host->cmd = NULL;
 693 }
 694
 695 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 696 {
 697         int div;
 698         u16 clk;
 699         unsigned long timeout;
 700
 701         if (clock == host->clock)
 702                 return;
 703
 704         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 705
 706         if (clock == 0)
 707                 goto out;
 708
 709         for (div = 1;div < 256;div *= 2) {
 710                 if ((host->max_clk / div) <= clock)
 711                         break;
 712         }
 713         div >>= 1;
 714
 715         clk = div << SDHCI_DIVIDER_SHIFT;
 716         clk |= SDHCI_CLOCK_INT_EN;
 717         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 718
 719         /* Wait max 10 ms */
 720         timeout = 10;
 721         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 722                 & SDHCI_CLOCK_INT_STABLE)) {
 723                 if (timeout == 0) {
 724                         printk(KERN_ERR "%s: Internal clock never "
 725                                 "stabilised.\n", mmc_hostname(host->mmc));
 726                         sdhci_dumpregs(host);
 727                         return;
 728                 }
 729                 timeout--;
 730                 mdelay(1);
 731         }
 732
 733         clk |= SDHCI_CLOCK_CARD_EN;
 734         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 735
 736 out:
 737         host->clock = clock;
 738 }
 739
 740 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 741 {
 742         u8 pwr;
 743
 744         if (host->power == power)
 745                 return;
 746
 747         if (power == (unsigned short)-1) {
 748                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 749                 goto out;
 750         }
 751
 752         /*
 753          * Spec says that we should clear the power reg before setting
 754          * a new value. Some controllers don't seem to like this though.
 755          */
 756         if (!(host->chip->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
 757                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 758
 759         pwr = SDHCI_POWER_ON;
 760
 761         switch (1 << power) {
 762         case MMC_VDD_165_195:
 763                 pwr |= SDHCI_POWER_180;
 764                 break;
 765         case MMC_VDD_29_30:
 766         case MMC_VDD_30_31:
 767                 pwr |= SDHCI_POWER_300;
 768                 break;
 769         case MMC_VDD_32_33:
 770         case MMC_VDD_33_34:
 771                 pwr |= SDHCI_POWER_330;
 772                 break;
 773         default:
 774                 BUG();
 775         }
 776
 777         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 778
 779 out:
 780         host->power = power;
 781 }
 782
 783 /*****************************************************************************\
 784  *                                                                           *
 785  * MMC callbacks                                                             *
 786  *                                                                           *
 787 \*****************************************************************************/
 788
 789 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 790 {
 791         struct sdhci_host *host;
 792         unsigned long flags;
 793
 794         host = mmc_priv(mmc);
 795
 796         spin_lock_irqsave(&host->lock, flags);
 797
 798         WARN_ON(host->mrq != NULL);
 799
 800 #ifndef CONFIG_LEDS_CLASS
 801         sdhci_activate_led(host);
 802 #endif
 803
 804         host->mrq = mrq;
 805
 806         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 807                 host->mrq->cmd->error = -ENOMEDIUM;
 808                 tasklet_schedule(&host->finish_tasklet);
 809         } else
 810                 sdhci_send_command(host, mrq->cmd);
 811
 812         mmiowb();
 813         spin_unlock_irqrestore(&host->lock, flags);
 814 }
 815
 816 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 817 {
 818         struct sdhci_host *host;
 819         unsigned long flags;
 820         u8 ctrl;
 821
 822         host = mmc_priv(mmc);
 823
 824         spin_lock_irqsave(&host->lock, flags);
 825
 826         /*
 827          * Reset the chip on each power off.
 828          * Should clear out any weird states.
 829          */
 830         if (ios->power_mode == MMC_POWER_OFF) {
 831                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 832                 sdhci_init(host);
 833         }
 834
 835         sdhci_set_clock(host, ios->clock);
 836
 837         if (ios->power_mode == MMC_POWER_OFF)
 838                 sdhci_set_power(host, -1);
 839         else
 840                 sdhci_set_power(host, ios->vdd);
 841
 842         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 843
 844         if (ios->bus_width == MMC_BUS_WIDTH_4)
 845                 ctrl |= SDHCI_CTRL_4BITBUS;
 846         else
 847                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 848
 849         if (ios->timing == MMC_TIMING_SD_HS)
 850                 ctrl |= SDHCI_CTRL_HISPD;
 851         else
 852                 ctrl &= ~SDHCI_CTRL_HISPD;
 853
 854         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 855
 856         /*
 857          * Some (ENE) controllers go apeshit on some ios operation,
 858          * signalling timeout and CRC errors even on CMD0. Resetting
 859          * it on each ios seems to solve the problem.
 860          */
 861         if(host->chip->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
 862                 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
 863
 864         mmiowb();
 865         spin_unlock_irqrestore(&host->lock, flags);
 866 }
 867
 868 static int sdhci_get_ro(struct mmc_host *mmc)
 869 {
 870         struct sdhci_host *host;
 871         unsigned long flags;
 872         int present;
 873
 874         host = mmc_priv(mmc);
 875
 876         spin_lock_irqsave(&host->lock, flags);
 877
 878         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 879
 880         spin_unlock_irqrestore(&host->lock, flags);
 881
 882         return !(present & SDHCI_WRITE_PROTECT);
 883 }
 884
 885 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
 886 {
 887         struct sdhci_host *host;
 888         unsigned long flags;
 889         u32 ier;
 890
 891         host = mmc_priv(mmc);
 892
 893         spin_lock_irqsave(&host->lock, flags);
 894
 895         ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
 896
 897         ier &= ~SDHCI_INT_CARD_INT;
 898         if (enable)
 899                 ier |= SDHCI_INT_CARD_INT;
 900
 901         writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
 902         writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 903
 904         mmiowb();
 905
 906         spin_unlock_irqrestore(&host->lock, flags);
 907 }
 908
 909 static const struct mmc_host_ops sdhci_ops = {
 910         .request        = sdhci_request,
 911         .set_ios        = sdhci_set_ios,
 912         .get_ro         = sdhci_get_ro,
 913         .enable_sdio_irq = sdhci_enable_sdio_irq,
 914 };
 915
 916 /*****************************************************************************\
 917  *                                                                           *
 918  * Tasklets                                                                  *
 919  *                                                                           *
 920 \*****************************************************************************/
 921
 922 static void sdhci_tasklet_card(unsigned long param)
 923 {
 924         struct sdhci_host *host;
 925         unsigned long flags;
 926
 927         host = (struct sdhci_host*)param;
 928
 929         spin_lock_irqsave(&host->lock, flags);
 930
 931         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 932                 if (host->mrq) {
 933                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 934                                 mmc_hostname(host->mmc));
 935                         printk(KERN_ERR "%s: Resetting controller.\n",
 936                                 mmc_hostname(host->mmc));
 937
 938                         sdhci_reset(host, SDHCI_RESET_CMD);
 939                         sdhci_reset(host, SDHCI_RESET_DATA);
 940
 941                         host->mrq->cmd->error = -ENOMEDIUM;
 942                         tasklet_schedule(&host->finish_tasklet);
 943                 }
 944         }
 945
 946         spin_unlock_irqrestore(&host->lock, flags);
 947
 948         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 949 }
 950
 951 static void sdhci_tasklet_finish(unsigned long param)
 952 {
 953         struct sdhci_host *host;
 954         unsigned long flags;
 955         struct mmc_request *mrq;
 956
 957         host = (struct sdhci_host*)param;
 958
 959         spin_lock_irqsave(&host->lock, flags);
 960
 961         del_timer(&host->timer);
 962
 963         mrq = host->mrq;
 964
 965         /*
 966          * The controller needs a reset of internal state machines
 967          * upon error conditions.
 968          */
 969         if (mrq->cmd->error ||
 970                 (mrq->data && (mrq->data->error ||
 971                 (mrq->data->stop && mrq->data->stop->error))) ||
 972                 (host->chip->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)) {
 973
 974                 /* Some controllers need this kick or reset won't work here */
 975                 if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
 976                         unsigned int clock;
 977
 978                         /* This is to force an update */
 979                         clock = host->clock;
 980                         host->clock = 0;
 981                         sdhci_set_clock(host, clock);
 982                 }
 983
 984                 /* Spec says we should do both at the same time, but Ricoh
 985                    controllers do not like that. */
 986                 sdhci_reset(host, SDHCI_RESET_CMD);
 987                 sdhci_reset(host, SDHCI_RESET_DATA);
 988         }
 989
 990         host->mrq = NULL;
 991         host->cmd = NULL;
 992         host->data = NULL;
 993
 994 #ifndef CONFIG_LEDS_CLASS
 995         sdhci_deactivate_led(host);
 996 #endif
 997
 998         mmiowb();
 999         spin_unlock_irqrestore(&host->lock, flags);
1000
1001         mmc_request_done(host->mmc, mrq);
1002 }
1003
1004 static void sdhci_timeout_timer(unsigned long data)
1005 {
1006         struct sdhci_host *host;
1007         unsigned long flags;
1008
1009         host = (struct sdhci_host*)data;
1010
1011         spin_lock_irqsave(&host->lock, flags);
1012
1013         if (host->mrq) {
1014                 printk(KERN_ERR "%s: Timeout waiting for hardware "
1015                         "interrupt.\n", mmc_hostname(host->mmc));
1016                 sdhci_dumpregs(host);
1017
1018                 if (host->data) {
1019                         host->data->error = -ETIMEDOUT;
1020                         sdhci_finish_data(host);
1021                 } else {
1022                         if (host->cmd)
1023                                 host->cmd->error = -ETIMEDOUT;
1024                         else
1025                                 host->mrq->cmd->error = -ETIMEDOUT;
1026
1027                         tasklet_schedule(&host->finish_tasklet);
1028                 }
1029         }
1030
1031         mmiowb();
1032         spin_unlock_irqrestore(&host->lock, flags);
1033 }
1034
1035 /*****************************************************************************\
1036  *                                                                           *
1037  * Interrupt handling                                                        *
1038  *                                                                           *
1039 \*****************************************************************************/
1040
1041 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
1042 {
1043         BUG_ON(intmask == 0);
1044
1045         if (!host->cmd) {
1046                 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
1047                         "though no command operation was in progress.\n",
1048                         mmc_hostname(host->mmc), (unsigned)intmask);
1049                 sdhci_dumpregs(host);
1050                 return;
1051         }
1052
1053         if (intmask & SDHCI_INT_TIMEOUT)
1054                 host->cmd->error = -ETIMEDOUT;
1055         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
1056                         SDHCI_INT_INDEX))
1057                 host->cmd->error = -EILSEQ;
1058
1059         if (host->cmd->error)
1060                 tasklet_schedule(&host->finish_tasklet);
1061         else if (intmask & SDHCI_INT_RESPONSE)
1062                 sdhci_finish_command(host);
1063 }
1064
1065 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
1066 {
1067         BUG_ON(intmask == 0);
1068
1069         if (!host->data) {
1070                 /*
1071                  * A data end interrupt is sent together with the response
1072                  * for the stop command.
1073                  */
1074                 if (intmask & SDHCI_INT_DATA_END)
1075                         return;
1076
1077                 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
1078                         "though no data operation was in progress.\n",
1079                         mmc_hostname(host->mmc), (unsigned)intmask);
1080                 sdhci_dumpregs(host);
1081
1082                 return;
1083         }
1084
1085         if (intmask & SDHCI_INT_DATA_TIMEOUT)
1086                 host->data->error = -ETIMEDOUT;
1087         else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
1088                 host->data->error = -EILSEQ;
1089
1090         if (host->data->error)
1091                 sdhci_finish_data(host);
1092         else {
1093                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1094                         sdhci_transfer_pio(host);
1095
1096                 /*
1097                  * We currently don't do anything fancy with DMA
1098                  * boundaries, but as we can't disable the feature
1099                  * we need to at least restart the transfer.
1100                  */
1101                 if (intmask & SDHCI_INT_DMA_END)
1102                         writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1103                                 host->ioaddr + SDHCI_DMA_ADDRESS);
1104
1105                 if (intmask & SDHCI_INT_DATA_END) {
1106                         if (host->cmd) {
1107                                 /*
1108                                  * Data managed to finish before the
1109                                  * command completed. Make sure we do
1110                                  * things in the proper order.
1111                                  */
1112                                 host->data_early = 1;
1113                         } else {
1114                                 sdhci_finish_data(host);
1115                         }
1116                 }
1117         }
1118 }
1119
1120 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1121 {
1122         irqreturn_t result;
1123         struct sdhci_host* host = dev_id;
1124         u32 intmask;
1125         int cardint = 0;
1126
1127         spin_lock(&host->lock);
1128
1129         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1130
1131         if (!intmask || intmask == 0xffffffff) {
1132                 result = IRQ_NONE;
1133                 goto out;
1134         }
1135
1136         DBG("*** %s got interrupt: 0x%08x\n",
1137                 mmc_hostname(host->mmc), intmask);
1138
1139         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1140                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1141                         host->ioaddr + SDHCI_INT_STATUS);
1142                 tasklet_schedule(&host->card_tasklet);
1143         }
1144
1145         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1146
1147         if (intmask & SDHCI_INT_CMD_MASK) {
1148                 writel(intmask & SDHCI_INT_CMD_MASK,
1149                         host->ioaddr + SDHCI_INT_STATUS);
1150                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1151         }
1152
1153         if (intmask & SDHCI_INT_DATA_MASK) {
1154                 writel(intmask & SDHCI_INT_DATA_MASK,
1155                         host->ioaddr + SDHCI_INT_STATUS);
1156                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1157         }
1158
1159         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1160
1161         intmask &= ~SDHCI_INT_ERROR;
1162
1163         if (intmask & SDHCI_INT_BUS_POWER) {
1164                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1165                         mmc_hostname(host->mmc));
1166                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1167         }
1168
1169         intmask &= ~SDHCI_INT_BUS_POWER;
1170
1171         if (intmask & SDHCI_INT_CARD_INT)
1172                 cardint = 1;
1173
1174         intmask &= ~SDHCI_INT_CARD_INT;
1175
1176         if (intmask) {
1177                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1178                         mmc_hostname(host->mmc), intmask);
1179                 sdhci_dumpregs(host);
1180
1181                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1182         }
1183
1184         result = IRQ_HANDLED;
1185
1186         mmiowb();
1187 out:
1188         spin_unlock(&host->lock);
1189
1190         /*
1191          * We have to delay this as it calls back into the driver.
1192          */
1193         if (cardint)
1194                 mmc_signal_sdio_irq(host->mmc);
1195
1196         return result;
1197 }
1198
1199 /*****************************************************************************\
1200  *                                                                           *
1201  * Suspend/resume                                                            *
1202  *                                                                           *
1203 \*****************************************************************************/
1204
1205 #ifdef CONFIG_PM
1206
1207 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
1208 {
1209         struct sdhci_chip *chip;
1210         int i, ret;
1211
1212         chip = pci_get_drvdata(pdev);
1213         if (!chip)
1214                 return 0;
1215
1216         DBG("Suspending...\n");
1217
1218         for (i = 0;i < chip->num_slots;i++) {
1219                 if (!chip->hosts[i])
1220                         continue;
1221                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
1222                 if (ret) {
1223                         for (i--;i >= 0;i--)
1224                                 mmc_resume_host(chip->hosts[i]->mmc);
1225                         return ret;
1226                 }
1227         }
1228
1229         pci_save_state(pdev);
1230         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
1231
1232         for (i = 0;i < chip->num_slots;i++) {
1233                 if (!chip->hosts[i])
1234                         continue;
1235                 free_irq(chip->hosts[i]->irq, chip->hosts[i]);
1236         }
1237
1238         pci_disable_device(pdev);
1239         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1240
1241         return 0;
1242 }
1243
1244 static int sdhci_resume (struct pci_dev *pdev)
1245 {
1246         struct sdhci_chip *chip;
1247         int i, ret;
1248
1249         chip = pci_get_drvdata(pdev);
1250         if (!chip)
1251                 return 0;
1252
1253         DBG("Resuming...\n");
1254
1255         pci_set_power_state(pdev, PCI_D0);
1256         pci_restore_state(pdev);
1257         ret = pci_enable_device(pdev);
1258         if (ret)
1259                 return ret;
1260
1261         for (i = 0;i < chip->num_slots;i++) {
1262                 if (!chip->hosts[i])
1263                         continue;
1264                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
1265                         pci_set_master(pdev);
1266                 ret = request_irq(chip->hosts[i]->irq, sdhci_irq,
1267                         IRQF_SHARED, mmc_hostname(chip->hosts[i]->mmc),
1268                         chip->hosts[i]);
1269                 if (ret)
1270                         return ret;
1271                 sdhci_init(chip->hosts[i]);
1272                 mmiowb();
1273                 ret = mmc_resume_host(chip->hosts[i]->mmc);
1274                 if (ret)
1275                         return ret;
1276         }
1277
1278         return 0;
1279 }
1280
1281 #else /* CONFIG_PM */
1282
1283 #define sdhci_suspend NULL
1284 #define sdhci_resume NULL
1285
1286 #endif /* CONFIG_PM */
1287
1288 /*****************************************************************************\
1289  *                                                                           *
1290  * Device probing/removal                                                    *
1291  *                                                                           *
1292 \*****************************************************************************/
1293
1294 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
1295 {
1296         int ret;
1297         unsigned int version;
1298         struct sdhci_chip *chip;
1299         struct mmc_host *mmc;
1300         struct sdhci_host *host;
1301
1302         u8 first_bar;
1303         unsigned int caps;
1304
1305         chip = pci_get_drvdata(pdev);
1306         BUG_ON(!chip);
1307
1308         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
1309         if (ret)
1310                 return ret;
1311
1312         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
1313
1314         if (first_bar > 5) {
1315                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
1316                 return -ENODEV;
1317         }
1318
1319         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
1320                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
1321                 return -ENODEV;
1322         }
1323
1324         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
1325                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. "
1326                         "You may experience problems.\n");
1327         }
1328
1329         if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
1330                 printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
1331                 return -ENODEV;
1332         }
1333
1334         if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
1335                 printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
1336                 return -ENODEV;
1337         }
1338
1339         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
1340         if (!mmc)
1341                 return -ENOMEM;
1342
1343         host = mmc_priv(mmc);
1344         host->mmc = mmc;
1345
1346         host->chip = chip;
1347         chip->hosts[slot] = host;
1348
1349         host->bar = first_bar + slot;
1350
1351         host->addr = pci_resource_start(pdev, host->bar);
1352         host->irq = pdev->irq;
1353
1354         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1355
1356         ret = pci_request_region(pdev, host->bar, mmc_hostname(mmc));
1357         if (ret)
1358                 goto free;
1359
1360         host->ioaddr = ioremap_nocache(host->addr,
1361                 pci_resource_len(pdev, host->bar));
1362         if (!host->ioaddr) {
1363                 ret = -ENOMEM;
1364                 goto release;
1365         }
1366
1367         sdhci_reset(host, SDHCI_RESET_ALL);
1368
1369         version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1370         version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1371         if (version > 1) {
1372                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1373                         "You may experience problems.\n", mmc_hostname(mmc),
1374                         version);
1375         }
1376
1377         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1378
1379         if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
1380                 host->flags |= SDHCI_USE_DMA;
1381         else if (!(caps & SDHCI_CAN_DO_DMA))
1382                 DBG("Controller doesn't have DMA capability\n");
1383         else
1384                 host->flags |= SDHCI_USE_DMA;
1385
1386         if ((chip->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1387                 (host->flags & SDHCI_USE_DMA)) {
1388                 DBG("Disabling DMA as it is marked broken\n");
1389                 host->flags &= ~SDHCI_USE_DMA;
1390         }
1391
1392         if (((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA) &&
1393                 (host->flags & SDHCI_USE_DMA)) {
1394                 printk(KERN_WARNING "%s: Will use DMA "
1395                         "mode even though HW doesn't fully "
1396                         "claim to support it.\n", mmc_hostname(mmc));
1397         }
1398
1399         if (host->flags & SDHCI_USE_DMA) {
1400                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1401                         printk(KERN_WARNING "%s: No suitable DMA available. "
1402                                 "Falling back to PIO.\n", mmc_hostname(mmc));
1403                         host->flags &= ~SDHCI_USE_DMA;
1404                 }
1405         }
1406
1407         if (host->flags & SDHCI_USE_DMA)
1408                 pci_set_master(pdev);
1409         else /* XXX: Hack to get MMC layer to avoid highmem */
1410                 pdev->dma_mask = 0;
1411
1412         host->max_clk =
1413                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1414         if (host->max_clk == 0) {
1415                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1416                         "frequency.\n", mmc_hostname(mmc));
1417                 ret = -ENODEV;
1418                 goto unmap;
1419         }
1420         host->max_clk *= 1000000;
1421
1422         host->timeout_clk =
1423                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1424         if (host->timeout_clk == 0) {
1425                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1426                         "frequency.\n", mmc_hostname(mmc));
1427                 ret = -ENODEV;
1428                 goto unmap;
1429         }
1430         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1431                 host->timeout_clk *= 1000;
1432
1433         /*
1434          * Set host parameters.
1435          */
1436         mmc->ops = &sdhci_ops;
1437         mmc->f_min = host->max_clk / 256;
1438         mmc->f_max = host->max_clk;
1439         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_SDIO_IRQ;
1440
1441         if (caps & SDHCI_CAN_DO_HISPD)
1442                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1443
1444         mmc->ocr_avail = 0;
1445         if (caps & SDHCI_CAN_VDD_330)
1446                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1447         if (caps & SDHCI_CAN_VDD_300)
1448                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1449         if (caps & SDHCI_CAN_VDD_180)
1450                 mmc->ocr_avail |= MMC_VDD_165_195;
1451
1452         if (mmc->ocr_avail == 0) {
1453                 printk(KERN_ERR "%s: Hardware doesn't report any "
1454                         "support voltages.\n", mmc_hostname(mmc));
1455                 ret = -ENODEV;
1456                 goto unmap;
1457         }
1458
1459         spin_lock_init(&host->lock);
1460
1461         /*
1462          * Maximum number of segments. Hardware cannot do scatter lists.
1463          */
1464         if (host->flags & SDHCI_USE_DMA)
1465                 mmc->max_hw_segs = 1;
1466         else
1467                 mmc->max_hw_segs = 16;
1468         mmc->max_phys_segs = 16;
1469
1470         /*
1471          * Maximum number of sectors in one transfer. Limited by DMA boundary
1472          * size (512KiB).
1473          */
1474         mmc->max_req_size = 524288;
1475
1476         /*
1477          * Maximum segment size. Could be one segment with the maximum number
1478          * of bytes.
1479          */
1480         mmc->max_seg_size = mmc->max_req_size;
1481
1482         /*
1483          * Maximum block size. This varies from controller to controller and
1484          * is specified in the capabilities register.
1485          */
1486         mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1487         if (mmc->max_blk_size >= 3) {
1488                 printk(KERN_WARNING "%s: Invalid maximum block size, "
1489                         "assuming 512 bytes\n", mmc_hostname(mmc));
1490                 mmc->max_blk_size = 512;
1491         } else
1492                 mmc->max_blk_size = 512 << mmc->max_blk_size;
1493
1494         /*
1495          * Maximum block count.
1496          */
1497         mmc->max_blk_count = 65535;
1498
1499         /*
1500          * Init tasklets.
1501          */
1502         tasklet_init(&host->card_tasklet,
1503                 sdhci_tasklet_card, (unsigned long)host);
1504         tasklet_init(&host->finish_tasklet,
1505                 sdhci_tasklet_finish, (unsigned long)host);
1506
1507         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1508
1509         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1510                 mmc_hostname(mmc), host);
1511         if (ret)
1512                 goto untasklet;
1513
1514         sdhci_init(host);
1515
1516 #ifdef CONFIG_MMC_DEBUG
1517         sdhci_dumpregs(host);
1518 #endif
1519
1520 #ifdef CONFIG_LEDS_CLASS
1521         host->led.name = mmc_hostname(mmc);
1522         host->led.brightness = LED_OFF;
1523         host->led.default_trigger = mmc_hostname(mmc);
1524         host->led.brightness_set = sdhci_led_control;
1525
1526         ret = led_classdev_register(&pdev->dev, &host->led);
1527         if (ret)
1528                 goto reset;
1529 #endif
1530
1531         mmiowb();
1532
1533         mmc_add_host(mmc);
1534
1535         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n",
1536                 mmc_hostname(mmc), host->addr, host->irq,
1537                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1538
1539         return 0;
1540
1541 #ifdef CONFIG_LEDS_CLASS
1542 reset:
1543         sdhci_reset(host, SDHCI_RESET_ALL);
1544         free_irq(host->irq, host);
1545 #endif
1546 untasklet:
1547         tasklet_kill(&host->card_tasklet);
1548         tasklet_kill(&host->finish_tasklet);
1549 unmap:
1550         iounmap(host->ioaddr);
1551 release:
1552         pci_release_region(pdev, host->bar);
1553 free:
1554         mmc_free_host(mmc);
1555
1556         return ret;
1557 }
1558
1559 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1560 {
1561         struct sdhci_chip *chip;
1562         struct mmc_host *mmc;
1563         struct sdhci_host *host;
1564
1565         chip = pci_get_drvdata(pdev);
1566         host = chip->hosts[slot];
1567         mmc = host->mmc;
1568
1569         chip->hosts[slot] = NULL;
1570
1571         mmc_remove_host(mmc);
1572
1573 #ifdef CONFIG_LEDS_CLASS
1574         led_classdev_unregister(&host->led);
1575 #endif
1576
1577         sdhci_reset(host, SDHCI_RESET_ALL);
1578
1579         free_irq(host->irq, host);
1580
1581         del_timer_sync(&host->timer);
1582
1583         tasklet_kill(&host->card_tasklet);
1584         tasklet_kill(&host->finish_tasklet);
1585
1586         iounmap(host->ioaddr);
1587
1588         pci_release_region(pdev, host->bar);
1589
1590         mmc_free_host(mmc);
1591 }
1592
1593 static int __devinit sdhci_probe(struct pci_dev *pdev,
1594         const struct pci_device_id *ent)
1595 {
1596         int ret, i;
1597         u8 slots, rev;
1598         struct sdhci_chip *chip;
1599
1600         BUG_ON(pdev == NULL);
1601         BUG_ON(ent == NULL);
1602
1603         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
1604
1605         printk(KERN_INFO DRIVER_NAME
1606                 ": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
1607                 pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
1608                 (int)rev);
1609
1610         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1611         if (ret)
1612                 return ret;
1613
1614         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1615         DBG("found %d slot(s)\n", slots);
1616         if (slots == 0)
1617                 return -ENODEV;
1618
1619         ret = pci_enable_device(pdev);
1620         if (ret)
1621                 return ret;
1622
1623         chip = kzalloc(sizeof(struct sdhci_chip) +
1624                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1625         if (!chip) {
1626                 ret = -ENOMEM;
1627                 goto err;
1628         }
1629
1630         chip->pdev = pdev;
1631         chip->quirks = ent->driver_data;
1632
1633         if (debug_quirks)
1634                 chip->quirks = debug_quirks;
1635
1636         chip->num_slots = slots;
1637         pci_set_drvdata(pdev, chip);
1638
1639         for (i = 0;i < slots;i++) {
1640                 ret = sdhci_probe_slot(pdev, i);
1641                 if (ret) {
1642                         for (i--;i >= 0;i--)
1643                                 sdhci_remove_slot(pdev, i);
1644                         goto free;
1645                 }
1646         }
1647
1648         return 0;
1649
1650 free:
1651         pci_set_drvdata(pdev, NULL);
1652         kfree(chip);
1653
1654 err:
1655         pci_disable_device(pdev);
1656         return ret;
1657 }
1658
1659 static void __devexit sdhci_remove(struct pci_dev *pdev)
1660 {
1661         int i;
1662         struct sdhci_chip *chip;
1663
1664         chip = pci_get_drvdata(pdev);
1665
1666         if (chip) {
1667                 for (i = 0;i < chip->num_slots;i++)
1668                         sdhci_remove_slot(pdev, i);
1669
1670                 pci_set_drvdata(pdev, NULL);
1671
1672                 kfree(chip);
1673         }
1674
1675         pci_disable_device(pdev);
1676 }
1677
1678 static struct pci_driver sdhci_driver = {
1679         .name =         DRIVER_NAME,
1680         .id_table =     pci_ids,
1681         .probe =        sdhci_probe,
1682         .remove =       __devexit_p(sdhci_remove),
1683         .suspend =      sdhci_suspend,
1684         .resume =       sdhci_resume,
1685 };
1686
1687 /*****************************************************************************\
1688  *                                                                           *
1689  * Driver init/exit                                                          *
1690  *                                                                           *
1691 \*****************************************************************************/
1692
1693 static int __init sdhci_drv_init(void)
1694 {
1695         printk(KERN_INFO DRIVER_NAME
1696                 ": Secure Digital Host Controller Interface driver\n");
1697         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1698
1699         return pci_register_driver(&sdhci_driver);
1700 }
1701
1702 static void __exit sdhci_drv_exit(void)
1703 {
1704         DBG("Exiting\n");
1705
1706         pci_unregister_driver(&sdhci_driver);
1707 }
1708
1709 module_init(sdhci_drv_init);
1710 module_exit(sdhci_drv_exit);
1711
1712 module_param(debug_quirks, uint, 0444);
1713
1714 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1715 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1716 MODULE_LICENSE("GPL");
1717
1718 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");