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   1 /*
   2  *  linux/drivers/mmc/sdhci.c - Secure Digital Host Controller Interface driver
   3  *
   4  *  Copyright (C) 2005-2006 Pierre Ossman, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11  /*
  12   * Note that PIO transfer is rather crappy atm. The buffer full/empty
  13   * interrupts aren't reliable so we currently transfer the entire buffer
  14   * directly. Patches to solve the problem are welcome.
  15   */
  16
  17 #include <linux/delay.h>
  18 #include <linux/highmem.h>
  19 #include <linux/pci.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include <linux/mmc/host.h>
  23 #include <linux/mmc/protocol.h>
  24
  25 #include <asm/scatterlist.h>
  26
  27 #include "sdhci.h"
  28
  29 #define DRIVER_NAME "sdhci"
  30 #define DRIVER_VERSION "0.11"
  31
  32 #define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
  33
  34 #define DBG(f, x...) \
  35         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  36
  37 static const struct pci_device_id pci_ids[] __devinitdata = {
  38         /* handle any SD host controller */
  39         {PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)},
  40         { /* end: all zeroes */ },
  41 };
  42
  43 MODULE_DEVICE_TABLE(pci, pci_ids);
  44
  45 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  46 static void sdhci_finish_data(struct sdhci_host *);
  47
  48 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  49 static void sdhci_finish_command(struct sdhci_host *);
  50
  51 static void sdhci_dumpregs(struct sdhci_host *host)
  52 {
  53         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  54
  55         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  56                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
  57                 readw(host->ioaddr + SDHCI_HOST_VERSION));
  58         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  59                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
  60                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
  61         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  62                 readl(host->ioaddr + SDHCI_ARGUMENT),
  63                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
  64         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  65                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
  66                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
  67         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  68                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
  69                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
  70         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  71                 readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
  72                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
  73         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
  74                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
  75                 readl(host->ioaddr + SDHCI_INT_STATUS));
  76         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
  77                 readl(host->ioaddr + SDHCI_INT_ENABLE),
  78                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
  79         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
  80                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
  81                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
  82         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
  83                 readl(host->ioaddr + SDHCI_CAPABILITIES),
  84                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
  85
  86         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
  87 }
  88
  89 /*****************************************************************************\
  90  *                                                                           *
  91  * Low level functions                                                       *
  92  *                                                                           *
  93 \*****************************************************************************/
  94
  95 static void sdhci_reset(struct sdhci_host *host, u8 mask)
  96 {
  97         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
  98
  99         if (mask & SDHCI_RESET_ALL) {
 100                 host->clock = 0;
 101
 102                 mdelay(50);
 103         }
 104 }
 105
 106 static void sdhci_init(struct sdhci_host *host)
 107 {
 108         u32 intmask;
 109
 110         sdhci_reset(host, SDHCI_RESET_ALL);
 111
 112         intmask = ~(SDHCI_INT_CARD_INT | SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
 113
 114         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 115         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 116
 117         /* This is unknown magic. */
 118         writeb(0xE, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 119 }
 120
 121 static void sdhci_activate_led(struct sdhci_host *host)
 122 {
 123         u8 ctrl;
 124
 125         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 126         ctrl |= SDHCI_CTRL_LED;
 127         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 128 }
 129
 130 static void sdhci_deactivate_led(struct sdhci_host *host)
 131 {
 132         u8 ctrl;
 133
 134         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 135         ctrl &= ~SDHCI_CTRL_LED;
 136         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 137 }
 138
 139 /*****************************************************************************\
 140  *                                                                           *
 141  * Core functions                                                            *
 142  *                                                                           *
 143 \*****************************************************************************/
 144
 145 static inline char* sdhci_kmap_sg(struct sdhci_host* host)
 146 {
 147         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
 148         return host->mapped_sg + host->cur_sg->offset;
 149 }
 150
 151 static inline void sdhci_kunmap_sg(struct sdhci_host* host)
 152 {
 153         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
 154 }
 155
 156 static inline int sdhci_next_sg(struct sdhci_host* host)
 157 {
 158         /*
 159          * Skip to next SG entry.
 160          */
 161         host->cur_sg++;
 162         host->num_sg--;
 163
 164         /*
 165          * Any entries left?
 166          */
 167         if (host->num_sg > 0) {
 168                 host->offset = 0;
 169                 host->remain = host->cur_sg->length;
 170         }
 171
 172         return host->num_sg;
 173 }
 174
 175 static void sdhci_transfer_pio(struct sdhci_host *host)
 176 {
 177         char *buffer;
 178         u32 mask;
 179         int bytes, size;
 180         unsigned long max_jiffies;
 181
 182         BUG_ON(!host->data);
 183
 184         if (host->num_sg == 0)
 185                 return;
 186
 187         bytes = 0;
 188         if (host->data->flags & MMC_DATA_READ)
 189                 mask = SDHCI_DATA_AVAILABLE;
 190         else
 191                 mask = SDHCI_SPACE_AVAILABLE;
 192
 193         buffer = sdhci_kmap_sg(host) + host->offset;
 194
 195         /* Transfer shouldn't take more than 5 s */
 196         max_jiffies = jiffies + HZ * 5;
 197
 198         while (host->size > 0) {
 199                 if (time_after(jiffies, max_jiffies)) {
 200                         printk(KERN_ERR "%s: PIO transfer stalled. "
 201                                 "Please report this to "
 202                                 BUGMAIL ".\n", mmc_hostname(host->mmc));
 203                         sdhci_dumpregs(host);
 204
 205                         sdhci_kunmap_sg(host);
 206
 207                         host->data->error = MMC_ERR_FAILED;
 208                         sdhci_finish_data(host);
 209                         return;
 210                 }
 211
 212                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask))
 213                         continue;
 214
 215                 size = min(host->size, host->remain);
 216
 217                 if (size >= 4) {
 218                         if (host->data->flags & MMC_DATA_READ)
 219                                 *(u32*)buffer = readl(host->ioaddr + SDHCI_BUFFER);
 220                         else
 221                                 writel(*(u32*)buffer, host->ioaddr + SDHCI_BUFFER);
 222                         size = 4;
 223                 } else if (size >= 2) {
 224                         if (host->data->flags & MMC_DATA_READ)
 225                                 *(u16*)buffer = readw(host->ioaddr + SDHCI_BUFFER);
 226                         else
 227                                 writew(*(u16*)buffer, host->ioaddr + SDHCI_BUFFER);
 228                         size = 2;
 229                 } else {
 230                         if (host->data->flags & MMC_DATA_READ)
 231                                 *(u8*)buffer = readb(host->ioaddr + SDHCI_BUFFER);
 232                         else
 233                                 writeb(*(u8*)buffer, host->ioaddr + SDHCI_BUFFER);
 234                         size = 1;
 235                 }
 236
 237                 buffer += size;
 238                 host->offset += size;
 239                 host->remain -= size;
 240
 241                 bytes += size;
 242                 host->size -= size;
 243
 244                 if (host->remain == 0) {
 245                         sdhci_kunmap_sg(host);
 246                         if (sdhci_next_sg(host) == 0) {
 247                                 DBG("PIO transfer: %d bytes\n", bytes);
 248                                 return;
 249                         }
 250                         buffer = sdhci_kmap_sg(host);
 251                 }
 252         }
 253
 254         sdhci_kunmap_sg(host);
 255
 256         DBG("PIO transfer: %d bytes\n", bytes);
 257 }
 258
 259 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 260 {
 261         u16 mode;
 262
 263         WARN_ON(host->data);
 264
 265         if (data == NULL) {
 266                 writew(0, host->ioaddr + SDHCI_TRANSFER_MODE);
 267                 return;
 268         }
 269
 270         DBG("blksz %04x blks %04x flags %08x\n",
 271                 1 << data->blksz_bits, data->blocks, data->flags);
 272         DBG("tsac %d ms nsac %d clk\n",
 273                 data->timeout_ns / 1000000, data->timeout_clks);
 274
 275         mode = SDHCI_TRNS_BLK_CNT_EN;
 276         if (data->blocks > 1)
 277                 mode |= SDHCI_TRNS_MULTI;
 278         if (data->flags & MMC_DATA_READ)
 279                 mode |= SDHCI_TRNS_READ;
 280         if (host->flags & SDHCI_USE_DMA)
 281                 mode |= SDHCI_TRNS_DMA;
 282
 283         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 284
 285         writew(1 << data->blksz_bits, host->ioaddr + SDHCI_BLOCK_SIZE);
 286         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 287
 288         if (host->flags & SDHCI_USE_DMA) {
 289                 int count;
 290
 291                 count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
 292                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 293                 BUG_ON(count != 1);
 294
 295                 writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
 296         } else {
 297                 host->size = (1 << data->blksz_bits) * data->blocks;
 298
 299                 host->cur_sg = data->sg;
 300                 host->num_sg = data->sg_len;
 301
 302                 host->offset = 0;
 303                 host->remain = host->cur_sg->length;
 304         }
 305 }
 306
 307 static void sdhci_finish_data(struct sdhci_host *host)
 308 {
 309         struct mmc_data *data;
 310         u32 intmask;
 311         u16 blocks;
 312
 313         BUG_ON(!host->data);
 314
 315         data = host->data;
 316         host->data = NULL;
 317
 318         if (host->flags & SDHCI_USE_DMA) {
 319                 pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
 320                         (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
 321         } else {
 322                 intmask = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
 323                 intmask &= ~(SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
 324                 writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 325
 326                 intmask = readl(host->ioaddr + SDHCI_INT_ENABLE);
 327                 intmask &= ~(SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
 328                 writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 329         }
 330
 331         /*
 332          * Controller doesn't count down when in single block mode.
 333          */
 334         if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
 335                 blocks = 0;
 336         else
 337                 blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
 338         data->bytes_xfered = (1 << data->blksz_bits) * (data->blocks - blocks);
 339
 340         if ((data->error == MMC_ERR_NONE) && blocks) {
 341                 printk(KERN_ERR "%s: Controller signalled completion even "
 342                         "though there were blocks left. Please report this "
 343                         "to " BUGMAIL ".\n", mmc_hostname(host->mmc));
 344                 data->error = MMC_ERR_FAILED;
 345         }
 346
 347         if (host->size != 0) {
 348                 printk(KERN_ERR "%s: %d bytes were left untransferred. "
 349                         "Please report this to " BUGMAIL ".\n",
 350                         mmc_hostname(host->mmc), host->size);
 351                 data->error = MMC_ERR_FAILED;
 352         }
 353
 354         DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 355
 356         if (data->stop) {
 357                 /*
 358                  * The controller needs a reset of internal state machines
 359                  * upon error conditions.
 360                  */
 361                 if (data->error != MMC_ERR_NONE) {
 362                         sdhci_reset(host, SDHCI_RESET_CMD);
 363                         sdhci_reset(host, SDHCI_RESET_DATA);
 364                 }
 365
 366                 sdhci_send_command(host, data->stop);
 367         } else
 368                 tasklet_schedule(&host->finish_tasklet);
 369 }
 370
 371 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 372 {
 373         int flags;
 374         u32 present;
 375         unsigned long max_jiffies;
 376
 377         WARN_ON(host->cmd);
 378
 379         DBG("Sending cmd (%x)\n", cmd->opcode);
 380
 381         /* Wait max 10 ms */
 382         max_jiffies = jiffies + (HZ + 99)/100;
 383         do {
 384                 if (time_after(jiffies, max_jiffies)) {
 385                         printk(KERN_ERR "%s: Controller never released "
 386                                 "inhibit bits. Please report this to "
 387                                 BUGMAIL ".\n", mmc_hostname(host->mmc));
 388                         sdhci_dumpregs(host);
 389                         cmd->error = MMC_ERR_FAILED;
 390                         tasklet_schedule(&host->finish_tasklet);
 391                         return;
 392                 }
 393                 present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 394         } while (present & (SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT));
 395
 396         mod_timer(&host->timer, jiffies + 10 * HZ);
 397
 398         host->cmd = cmd;
 399
 400         sdhci_prepare_data(host, cmd->data);
 401
 402         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 403
 404         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 405                 printk(KERN_ERR "%s: Unsupported response type! "
 406                         "Please report this to " BUGMAIL ".\n",
 407                         mmc_hostname(host->mmc));
 408                 cmd->error = MMC_ERR_INVALID;
 409                 tasklet_schedule(&host->finish_tasklet);
 410                 return;
 411         }
 412
 413         if (!(cmd->flags & MMC_RSP_PRESENT))
 414                 flags = SDHCI_CMD_RESP_NONE;
 415         else if (cmd->flags & MMC_RSP_136)
 416                 flags = SDHCI_CMD_RESP_LONG;
 417         else if (cmd->flags & MMC_RSP_BUSY)
 418                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 419         else
 420                 flags = SDHCI_CMD_RESP_SHORT;
 421
 422         if (cmd->flags & MMC_RSP_CRC)
 423                 flags |= SDHCI_CMD_CRC;
 424         if (cmd->flags & MMC_RSP_OPCODE)
 425                 flags |= SDHCI_CMD_INDEX;
 426         if (cmd->data)
 427                 flags |= SDHCI_CMD_DATA;
 428
 429         writel(SDHCI_MAKE_CMD(cmd->opcode, flags),
 430                 host->ioaddr + SDHCI_COMMAND);
 431 }
 432
 433 static void sdhci_finish_command(struct sdhci_host *host)
 434 {
 435         int i;
 436
 437         BUG_ON(host->cmd == NULL);
 438
 439         if (host->cmd->flags & MMC_RSP_PRESENT) {
 440                 if (host->cmd->flags & MMC_RSP_136) {
 441                         /* CRC is stripped so we need to do some shifting. */
 442                         for (i = 0;i < 4;i++) {
 443                                 host->cmd->resp[i] = readl(host->ioaddr +
 444                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 445                                 if (i != 3)
 446                                         host->cmd->resp[i] |=
 447                                                 readb(host->ioaddr +
 448                                                 SDHCI_RESPONSE + (3-i)*4-1);
 449                         }
 450                 } else {
 451                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 452                 }
 453         }
 454
 455         host->cmd->error = MMC_ERR_NONE;
 456
 457         DBG("Ending cmd (%x)\n", host->cmd->opcode);
 458
 459         if (host->cmd->data) {
 460                 u32 intmask;
 461
 462                 host->data = host->cmd->data;
 463
 464                 if (!(host->flags & SDHCI_USE_DMA)) {
 465                         /*
 466                          * Don't enable the interrupts until now to make sure we
 467                          * get stable handling of the FIFO.
 468                          */
 469                         intmask = readl(host->ioaddr + SDHCI_INT_ENABLE);
 470                         intmask |= SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL;
 471                         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 472
 473                         intmask = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
 474                         intmask |= SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL;
 475                         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 476
 477                         /*
 478                          * The buffer interrupts are to unreliable so we
 479                          * start the transfer immediatly.
 480                          */
 481                         sdhci_transfer_pio(host);
 482                 }
 483         } else
 484                 tasklet_schedule(&host->finish_tasklet);
 485
 486         host->cmd = NULL;
 487 }
 488
 489 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 490 {
 491         int div;
 492         u16 clk;
 493         unsigned long max_jiffies;
 494
 495         if (clock == host->clock)
 496                 return;
 497
 498         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 499
 500         if (clock == 0)
 501                 goto out;
 502
 503         for (div = 1;div < 256;div *= 2) {
 504                 if ((host->max_clk / div) <= clock)
 505                         break;
 506         }
 507         div >>= 1;
 508
 509         clk = div << SDHCI_DIVIDER_SHIFT;
 510         clk |= SDHCI_CLOCK_INT_EN;
 511         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 512
 513         /* Wait max 10 ms */
 514         max_jiffies = jiffies + (HZ + 99)/100;
 515         do {
 516                 if (time_after(jiffies, max_jiffies)) {
 517                         printk(KERN_ERR "%s: Internal clock never stabilised. "
 518                                 "Please report this to " BUGMAIL ".\n",
 519                                 mmc_hostname(host->mmc));
 520                         sdhci_dumpregs(host);
 521                         return;
 522                 }
 523                 clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL);
 524         } while (!(clk & SDHCI_CLOCK_INT_STABLE));
 525
 526         clk |= SDHCI_CLOCK_CARD_EN;
 527         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 528
 529 out:
 530         host->clock = clock;
 531 }
 532
 533 /*****************************************************************************\
 534  *                                                                           *
 535  * MMC callbacks                                                             *
 536  *                                                                           *
 537 \*****************************************************************************/
 538
 539 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 540 {
 541         struct sdhci_host *host;
 542         unsigned long flags;
 543
 544         host = mmc_priv(mmc);
 545
 546         spin_lock_irqsave(&host->lock, flags);
 547
 548         WARN_ON(host->mrq != NULL);
 549
 550         sdhci_activate_led(host);
 551
 552         host->mrq = mrq;
 553
 554         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 555                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 556                 tasklet_schedule(&host->finish_tasklet);
 557         } else
 558                 sdhci_send_command(host, mrq->cmd);
 559
 560         spin_unlock_irqrestore(&host->lock, flags);
 561 }
 562
 563 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 564 {
 565         struct sdhci_host *host;
 566         unsigned long flags;
 567         u8 ctrl;
 568
 569         host = mmc_priv(mmc);
 570
 571         spin_lock_irqsave(&host->lock, flags);
 572
 573         DBG("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
 574              ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
 575              ios->vdd, ios->bus_width);
 576
 577         /*
 578          * Reset the chip on each power off.
 579          * Should clear out any weird states.
 580          */
 581         if (ios->power_mode == MMC_POWER_OFF) {
 582                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 583                 spin_unlock_irqrestore(&host->lock, flags);
 584                 sdhci_init(host);
 585                 spin_lock_irqsave(&host->lock, flags);
 586         }
 587
 588         sdhci_set_clock(host, ios->clock);
 589
 590         if (ios->power_mode == MMC_POWER_OFF)
 591                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 592         else
 593                 writeb(0xFF, host->ioaddr + SDHCI_POWER_CONTROL);
 594
 595         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 596         if (ios->bus_width == MMC_BUS_WIDTH_4)
 597                 ctrl |= SDHCI_CTRL_4BITBUS;
 598         else
 599                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 600         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 601
 602         spin_unlock_irqrestore(&host->lock, flags);
 603 }
 604
 605 static int sdhci_get_ro(struct mmc_host *mmc)
 606 {
 607         struct sdhci_host *host;
 608         unsigned long flags;
 609         int present;
 610
 611         host = mmc_priv(mmc);
 612
 613         spin_lock_irqsave(&host->lock, flags);
 614
 615         present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
 616
 617         spin_unlock_irqrestore(&host->lock, flags);
 618
 619         return !(present & SDHCI_WRITE_PROTECT);
 620 }
 621
 622 static struct mmc_host_ops sdhci_ops = {
 623         .request        = sdhci_request,
 624         .set_ios        = sdhci_set_ios,
 625         .get_ro         = sdhci_get_ro,
 626 };
 627
 628 /*****************************************************************************\
 629  *                                                                           *
 630  * Tasklets                                                                  *
 631  *                                                                           *
 632 \*****************************************************************************/
 633
 634 static void sdhci_tasklet_card(unsigned long param)
 635 {
 636         struct sdhci_host *host;
 637         unsigned long flags;
 638
 639         host = (struct sdhci_host*)param;
 640
 641         spin_lock_irqsave(&host->lock, flags);
 642
 643         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
 644                 if (host->mrq) {
 645                         printk(KERN_ERR "%s: Card removed during transfer!\n",
 646                                 mmc_hostname(host->mmc));
 647                         printk(KERN_ERR "%s: Resetting controller.\n",
 648                                 mmc_hostname(host->mmc));
 649
 650                         sdhci_reset(host, SDHCI_RESET_CMD);
 651                         sdhci_reset(host, SDHCI_RESET_DATA);
 652
 653                         host->mrq->cmd->error = MMC_ERR_FAILED;
 654                         tasklet_schedule(&host->finish_tasklet);
 655                 }
 656         }
 657
 658         spin_unlock_irqrestore(&host->lock, flags);
 659
 660         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 661 }
 662
 663 static void sdhci_tasklet_finish(unsigned long param)
 664 {
 665         struct sdhci_host *host;
 666         unsigned long flags;
 667         struct mmc_request *mrq;
 668
 669         host = (struct sdhci_host*)param;
 670
 671         spin_lock_irqsave(&host->lock, flags);
 672
 673         del_timer(&host->timer);
 674
 675         mrq = host->mrq;
 676
 677         DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 678
 679         /*
 680          * The controller needs a reset of internal state machines
 681          * upon error conditions.
 682          */
 683         if ((mrq->cmd->error != MMC_ERR_NONE) ||
 684                 (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
 685                 (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
 686                 sdhci_reset(host, SDHCI_RESET_CMD);
 687                 sdhci_reset(host, SDHCI_RESET_DATA);
 688         }
 689
 690         host->mrq = NULL;
 691         host->cmd = NULL;
 692         host->data = NULL;
 693
 694         sdhci_deactivate_led(host);
 695
 696         spin_unlock_irqrestore(&host->lock, flags);
 697
 698         mmc_request_done(host->mmc, mrq);
 699 }
 700
 701 static void sdhci_timeout_timer(unsigned long data)
 702 {
 703         struct sdhci_host *host;
 704         unsigned long flags;
 705
 706         host = (struct sdhci_host*)data;
 707
 708         spin_lock_irqsave(&host->lock, flags);
 709
 710         if (host->mrq) {
 711                 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
 712                         "Please report this to " BUGMAIL ".\n",
 713                         mmc_hostname(host->mmc));
 714                 sdhci_dumpregs(host);
 715
 716                 if (host->data) {
 717                         host->data->error = MMC_ERR_TIMEOUT;
 718                         sdhci_finish_data(host);
 719                 } else {
 720                         if (host->cmd)
 721                                 host->cmd->error = MMC_ERR_TIMEOUT;
 722                         else
 723                                 host->mrq->cmd->error = MMC_ERR_TIMEOUT;
 724
 725                         tasklet_schedule(&host->finish_tasklet);
 726                 }
 727         }
 728
 729         spin_unlock_irqrestore(&host->lock, flags);
 730 }
 731
 732 /*****************************************************************************\
 733  *                                                                           *
 734  * Interrupt handling                                                        *
 735  *                                                                           *
 736 \*****************************************************************************/
 737
 738 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
 739 {
 740         BUG_ON(intmask == 0);
 741
 742         if (!host->cmd) {
 743                 printk(KERN_ERR "%s: Got command interrupt even though no "
 744                         "command operation was in progress.\n",
 745                         mmc_hostname(host->mmc));
 746                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 747                         mmc_hostname(host->mmc));
 748                 sdhci_dumpregs(host);
 749                 return;
 750         }
 751
 752         if (intmask & SDHCI_INT_RESPONSE)
 753                 sdhci_finish_command(host);
 754         else {
 755                 if (intmask & SDHCI_INT_TIMEOUT)
 756                         host->cmd->error = MMC_ERR_TIMEOUT;
 757                 else if (intmask & SDHCI_INT_CRC)
 758                         host->cmd->error = MMC_ERR_BADCRC;
 759                 else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
 760                         host->cmd->error = MMC_ERR_FAILED;
 761                 else
 762                         host->cmd->error = MMC_ERR_INVALID;
 763
 764                 tasklet_schedule(&host->finish_tasklet);
 765         }
 766 }
 767
 768 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 769 {
 770         BUG_ON(intmask == 0);
 771
 772         if (!host->data) {
 773                 /*
 774                  * A data end interrupt is sent together with the response
 775                  * for the stop command.
 776                  */
 777                 if (intmask & SDHCI_INT_DATA_END)
 778                         return;
 779
 780                 printk(KERN_ERR "%s: Got data interrupt even though no "
 781                         "data operation was in progress.\n",
 782                         mmc_hostname(host->mmc));
 783                 printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
 784                         mmc_hostname(host->mmc));
 785                 sdhci_dumpregs(host);
 786
 787                 return;
 788         }
 789
 790         if (intmask & SDHCI_INT_DATA_TIMEOUT)
 791                 host->data->error = MMC_ERR_TIMEOUT;
 792         else if (intmask & SDHCI_INT_DATA_CRC)
 793                 host->data->error = MMC_ERR_BADCRC;
 794         else if (intmask & SDHCI_INT_DATA_END_BIT)
 795                 host->data->error = MMC_ERR_FAILED;
 796
 797         if (host->data->error != MMC_ERR_NONE)
 798                 sdhci_finish_data(host);
 799         else {
 800                 if (intmask & (SDHCI_INT_BUF_FULL | SDHCI_INT_BUF_EMPTY))
 801                         sdhci_transfer_pio(host);
 802
 803                 if (intmask & SDHCI_INT_DATA_END)
 804                         sdhci_finish_data(host);
 805         }
 806 }
 807
 808 static irqreturn_t sdhci_irq(int irq, void *dev_id, struct pt_regs *regs)
 809 {
 810         irqreturn_t result;
 811         struct sdhci_host* host = dev_id;
 812         u32 intmask;
 813
 814         spin_lock(&host->lock);
 815
 816         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
 817
 818         if (!intmask) {
 819                 result = IRQ_NONE;
 820                 goto out;
 821         }
 822
 823         DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
 824
 825         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE))
 826                 tasklet_schedule(&host->card_tasklet);
 827
 828         if (intmask & SDHCI_INT_CMD_MASK) {
 829                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
 830
 831                 writel(intmask & SDHCI_INT_CMD_MASK,
 832                         host->ioaddr + SDHCI_INT_STATUS);
 833         }
 834
 835         if (intmask & SDHCI_INT_DATA_MASK) {
 836                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
 837
 838                 writel(intmask & SDHCI_INT_DATA_MASK,
 839                         host->ioaddr + SDHCI_INT_STATUS);
 840         }
 841
 842         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
 843
 844         if (intmask & SDHCI_INT_CARD_INT) {
 845                 printk(KERN_ERR "%s: Unexpected card interrupt. Please "
 846                         "report this to " BUGMAIL ".\n",
 847                         mmc_hostname(host->mmc));
 848                 sdhci_dumpregs(host);
 849         }
 850
 851         if (intmask & SDHCI_INT_BUS_POWER) {
 852                 printk(KERN_ERR "%s: Unexpected bus power interrupt. Please "
 853                         "report this to " BUGMAIL ".\n",
 854                         mmc_hostname(host->mmc));
 855                 sdhci_dumpregs(host);
 856         }
 857
 858         if (intmask & SDHCI_INT_ACMD12ERR) {
 859                 printk(KERN_ERR "%s: Unexpected auto CMD12 error. Please "
 860                         "report this to " BUGMAIL ".\n",
 861                         mmc_hostname(host->mmc));
 862                 sdhci_dumpregs(host);
 863
 864                 writew(~0, host->ioaddr + SDHCI_ACMD12_ERR);
 865         }
 866
 867         if (intmask)
 868                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
 869
 870         result = IRQ_HANDLED;
 871
 872 out:
 873         spin_unlock(&host->lock);
 874
 875         return result;
 876 }
 877
 878 /*****************************************************************************\
 879  *                                                                           *
 880  * Suspend/resume                                                            *
 881  *                                                                           *
 882 \*****************************************************************************/
 883
 884 #ifdef CONFIG_PM
 885
 886 static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
 887 {
 888         struct sdhci_chip *chip;
 889         int i, ret;
 890
 891         chip = pci_get_drvdata(pdev);
 892         if (!chip)
 893                 return 0;
 894
 895         DBG("Suspending...\n");
 896
 897         for (i = 0;i < chip->num_slots;i++) {
 898                 if (!chip->hosts[i])
 899                         continue;
 900                 ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
 901                 if (ret) {
 902                         for (i--;i >= 0;i--)
 903                                 mmc_resume_host(chip->hosts[i]->mmc);
 904                         return ret;
 905                 }
 906         }
 907
 908         pci_save_state(pdev);
 909         pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
 910         pci_disable_device(pdev);
 911         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 912
 913         return 0;
 914 }
 915
 916 static int sdhci_resume (struct pci_dev *pdev)
 917 {
 918         struct sdhci_chip *chip;
 919         int i, ret;
 920
 921         chip = pci_get_drvdata(pdev);
 922         if (!chip)
 923                 return 0;
 924
 925         DBG("Resuming...\n");
 926
 927         pci_set_power_state(pdev, PCI_D0);
 928         pci_restore_state(pdev);
 929         pci_enable_device(pdev);
 930
 931         for (i = 0;i < chip->num_slots;i++) {
 932                 if (!chip->hosts[i])
 933                         continue;
 934                 if (chip->hosts[i]->flags & SDHCI_USE_DMA)
 935                         pci_set_master(pdev);
 936                 sdhci_init(chip->hosts[i]);
 937                 ret = mmc_resume_host(chip->hosts[i]->mmc);
 938                 if (ret)
 939                         return ret;
 940         }
 941
 942         return 0;
 943 }
 944
 945 #else /* CONFIG_PM */
 946
 947 #define sdhci_suspend NULL
 948 #define sdhci_resume NULL
 949
 950 #endif /* CONFIG_PM */
 951
 952 /*****************************************************************************\
 953  *                                                                           *
 954  * Device probing/removal                                                    *
 955  *                                                                           *
 956 \*****************************************************************************/
 957
 958 static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
 959 {
 960         int ret;
 961         struct sdhci_chip *chip;
 962         struct mmc_host *mmc;
 963         struct sdhci_host *host;
 964
 965         u8 first_bar;
 966         unsigned int caps;
 967
 968         chip = pci_get_drvdata(pdev);
 969         BUG_ON(!chip);
 970
 971         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
 972         if (ret)
 973                 return ret;
 974
 975         first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
 976
 977         if (first_bar > 5) {
 978                 printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
 979                 return -ENODEV;
 980         }
 981
 982         if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
 983                 printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
 984                 return -ENODEV;
 985         }
 986
 987         if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
 988                 printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. Aborting.\n");
 989                 return -ENODEV;
 990         }
 991
 992         mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
 993         if (!mmc)
 994                 return -ENOMEM;
 995
 996         host = mmc_priv(mmc);
 997         host->mmc = mmc;
 998
 999         host->bar = first_bar + slot;
1000
1001         host->addr = pci_resource_start(pdev, host->bar);
1002         host->irq = pdev->irq;
1003
1004         DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
1005
1006         snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
1007
1008         ret = pci_request_region(pdev, host->bar, host->slot_descr);
1009         if (ret)
1010                 goto free;
1011
1012         host->ioaddr = ioremap_nocache(host->addr,
1013                 pci_resource_len(pdev, host->bar));
1014         if (!host->ioaddr) {
1015                 ret = -ENOMEM;
1016                 goto release;
1017         }
1018
1019         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1020
1021         if ((caps & SDHCI_CAN_DO_DMA) && ((pdev->class & 0x0000FF) == 0x01))
1022                 host->flags |= SDHCI_USE_DMA;
1023
1024         if (host->flags & SDHCI_USE_DMA) {
1025                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
1026                         printk(KERN_WARNING "%s: No suitable DMA available. "
1027                                 "Falling back to PIO.\n", host->slot_descr);
1028                         host->flags &= ~SDHCI_USE_DMA;
1029                 }
1030         }
1031
1032         if (host->flags & SDHCI_USE_DMA)
1033                 pci_set_master(pdev);
1034         else /* XXX: Hack to get MMC layer to avoid highmem */
1035                 pdev->dma_mask = 0;
1036
1037         host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1038         host->max_clk *= 1000000;
1039
1040         /*
1041          * Set host parameters.
1042          */
1043         mmc->ops = &sdhci_ops;
1044         mmc->f_min = host->max_clk / 256;
1045         mmc->f_max = host->max_clk;
1046         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1047         mmc->caps = MMC_CAP_4_BIT_DATA;
1048
1049         spin_lock_init(&host->lock);
1050
1051         /*
1052          * Maximum number of segments. Hardware cannot do scatter lists.
1053          */
1054         if (host->flags & SDHCI_USE_DMA)
1055                 mmc->max_hw_segs = 1;
1056         else
1057                 mmc->max_hw_segs = 16;
1058         mmc->max_phys_segs = 16;
1059
1060         /*
1061          * Maximum number of sectors in one transfer. Limited by sector
1062          * count register.
1063          */
1064         mmc->max_sectors = 0x3FFF;
1065
1066         /*
1067          * Maximum segment size. Could be one segment with the maximum number
1068          * of sectors.
1069          */
1070         mmc->max_seg_size = mmc->max_sectors * 512;
1071
1072         /*
1073          * Init tasklets.
1074          */
1075         tasklet_init(&host->card_tasklet,
1076                 sdhci_tasklet_card, (unsigned long)host);
1077         tasklet_init(&host->finish_tasklet,
1078                 sdhci_tasklet_finish, (unsigned long)host);
1079
1080         setup_timer(&host->timer, sdhci_timeout_timer, (int)host);
1081
1082         ret = request_irq(host->irq, sdhci_irq, SA_SHIRQ,
1083                 host->slot_descr, host);
1084         if (ret)
1085                 goto unmap;
1086
1087         sdhci_init(host);
1088
1089 #ifdef CONFIG_MMC_DEBUG
1090         sdhci_dumpregs(host);
1091 #endif
1092
1093         host->chip = chip;
1094         chip->hosts[slot] = host;
1095
1096         mmc_add_host(mmc);
1097
1098         printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
1099                 host->addr, host->irq,
1100                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1101
1102         return 0;
1103
1104 unmap:
1105         tasklet_kill(&host->card_tasklet);
1106         tasklet_kill(&host->finish_tasklet);
1107
1108         iounmap(host->ioaddr);
1109 release:
1110         pci_release_region(pdev, host->bar);
1111 free:
1112         mmc_free_host(mmc);
1113
1114         return ret;
1115 }
1116
1117 static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
1118 {
1119         struct sdhci_chip *chip;
1120         struct mmc_host *mmc;
1121         struct sdhci_host *host;
1122
1123         chip = pci_get_drvdata(pdev);
1124         host = chip->hosts[slot];
1125         mmc = host->mmc;
1126
1127         chip->hosts[slot] = NULL;
1128
1129         mmc_remove_host(mmc);
1130
1131         sdhci_reset(host, SDHCI_RESET_ALL);
1132
1133         free_irq(host->irq, host);
1134
1135         del_timer_sync(&host->timer);
1136
1137         tasklet_kill(&host->card_tasklet);
1138         tasklet_kill(&host->finish_tasklet);
1139
1140         iounmap(host->ioaddr);
1141
1142         pci_release_region(pdev, host->bar);
1143
1144         mmc_free_host(mmc);
1145 }
1146
1147 static int __devinit sdhci_probe(struct pci_dev *pdev,
1148         const struct pci_device_id *ent)
1149 {
1150         int ret, i;
1151         u8 slots;
1152         struct sdhci_chip *chip;
1153
1154         BUG_ON(pdev == NULL);
1155         BUG_ON(ent == NULL);
1156
1157         DBG("found at %s\n", pci_name(pdev));
1158
1159         ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
1160         if (ret)
1161                 return ret;
1162
1163         slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
1164         DBG("found %d slot(s)\n", slots);
1165         if (slots == 0)
1166                 return -ENODEV;
1167
1168         ret = pci_enable_device(pdev);
1169         if (ret)
1170                 return ret;
1171
1172         chip = kzalloc(sizeof(struct sdhci_chip) +
1173                 sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
1174         if (!chip) {
1175                 ret = -ENOMEM;
1176                 goto err;
1177         }
1178
1179         chip->pdev = pdev;
1180
1181         chip->num_slots = slots;
1182         pci_set_drvdata(pdev, chip);
1183
1184         for (i = 0;i < slots;i++) {
1185                 ret = sdhci_probe_slot(pdev, i);
1186                 if (ret) {
1187                         for (i--;i >= 0;i--)
1188                                 sdhci_remove_slot(pdev, i);
1189                         goto free;
1190                 }
1191         }
1192
1193         return 0;
1194
1195 free:
1196         pci_set_drvdata(pdev, NULL);
1197         kfree(chip);
1198
1199 err:
1200         pci_disable_device(pdev);
1201         return ret;
1202 }
1203
1204 static void __devexit sdhci_remove(struct pci_dev *pdev)
1205 {
1206         int i;
1207         struct sdhci_chip *chip;
1208
1209         chip = pci_get_drvdata(pdev);
1210
1211         if (chip) {
1212                 for (i = 0;i < chip->num_slots;i++)
1213                         sdhci_remove_slot(pdev, i);
1214
1215                 pci_set_drvdata(pdev, NULL);
1216
1217                 kfree(chip);
1218         }
1219
1220         pci_disable_device(pdev);
1221 }
1222
1223 static struct pci_driver sdhci_driver = {
1224         .name =         DRIVER_NAME,
1225         .id_table =     pci_ids,
1226         .probe =        sdhci_probe,
1227         .remove =       __devexit_p(sdhci_remove),
1228         .suspend =      sdhci_suspend,
1229         .resume =       sdhci_resume,
1230 };
1231
1232 /*****************************************************************************\
1233  *                                                                           *
1234  * Driver init/exit                                                          *
1235  *                                                                           *
1236 \*****************************************************************************/
1237
1238 static int __init sdhci_drv_init(void)
1239 {
1240         printk(KERN_INFO DRIVER_NAME
1241                 ": Secure Digital Host Controller Interface driver, "
1242                 DRIVER_VERSION "\n");
1243         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1244
1245         return pci_register_driver(&sdhci_driver);
1246 }
1247
1248 static void __exit sdhci_drv_exit(void)
1249 {
1250         DBG("Exiting\n");
1251
1252         pci_unregister_driver(&sdhci_driver);
1253 }
1254
1255 module_init(sdhci_drv_init);
1256 module_exit(sdhci_drv_exit);
1257
1258 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1259 MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
1260 MODULE_VERSION(DRIVER_VERSION);
1261 MODULE_LICENSE("GPL");