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   1 /*
   2  *  linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver
   3  *
   4  *  Copyright (C) 2004-2005 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  * Warning!
  12  *
  13  * Changes to the FIFO system should be done with extreme care since
  14  * the hardware is full of bugs related to the FIFO. Known issues are:
  15  *
  16  * - FIFO size field in FSR is always zero.
  17  *
  18  * - FIFO interrupts tend not to work as they should. Interrupts are
  19  *   triggered only for full/empty events, not for threshold values.
  20  *
  21  * - On APIC systems the FIFO empty interrupt is sometimes lost.
  22  */
  23
  24 #include <linux/config.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/init.h>
  28 #include <linux/ioport.h>
  29 #include <linux/device.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/delay.h>
  33 #include <linux/pnp.h>
  34 #include <linux/highmem.h>
  35 #include <linux/mmc/host.h>
  36 #include <linux/mmc/protocol.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/dma.h>
  40 #include <asm/scatterlist.h>
  41
  42 #include "wbsd.h"
  43
  44 #define DRIVER_NAME "wbsd"
  45 #define DRIVER_VERSION "1.4"
  46
  47 #ifdef CONFIG_MMC_DEBUG
  48 #define DBG(x...) \
  49         printk(KERN_DEBUG DRIVER_NAME ": " x)
  50 #define DBGF(f, x...) \
  51         printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__ , ##x)
  52 #else
  53 #define DBG(x...)       do { } while (0)
  54 #define DBGF(x...)      do { } while (0)
  55 #endif
  56
  57 /*
  58  * Device resources
  59  */
  60
  61 #ifdef CONFIG_PNP
  62
  63 static const struct pnp_device_id pnp_dev_table[] = {
  64         { "WEC0517", 0 },
  65         { "WEC0518", 0 },
  66         { "", 0 },
  67 };
  68
  69 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
  70
  71 #endif /* CONFIG_PNP */
  72
  73 static const int config_ports[] = { 0x2E, 0x4E };
  74 static const int unlock_codes[] = { 0x83, 0x87 };
  75
  76 static const int valid_ids[] = {
  77         0x7112,
  78         };
  79
  80 #ifdef CONFIG_PNP
  81 static unsigned int nopnp = 0;
  82 #else
  83 static const unsigned int nopnp = 1;
  84 #endif
  85 static unsigned int io = 0x248;
  86 static unsigned int irq = 6;
  87 static int dma = 2;
  88
  89 /*
  90  * Basic functions
  91  */
  92
  93 static inline void wbsd_unlock_config(struct wbsd_host* host)
  94 {
  95         BUG_ON(host->config == 0);
  96
  97         outb(host->unlock_code, host->config);
  98         outb(host->unlock_code, host->config);
  99 }
 100
 101 static inline void wbsd_lock_config(struct wbsd_host* host)
 102 {
 103         BUG_ON(host->config == 0);
 104
 105         outb(LOCK_CODE, host->config);
 106 }
 107
 108 static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value)
 109 {
 110         BUG_ON(host->config == 0);
 111
 112         outb(reg, host->config);
 113         outb(value, host->config + 1);
 114 }
 115
 116 static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg)
 117 {
 118         BUG_ON(host->config == 0);
 119
 120         outb(reg, host->config);
 121         return inb(host->config + 1);
 122 }
 123
 124 static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value)
 125 {
 126         outb(index, host->base + WBSD_IDXR);
 127         outb(value, host->base + WBSD_DATAR);
 128 }
 129
 130 static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index)
 131 {
 132         outb(index, host->base + WBSD_IDXR);
 133         return inb(host->base + WBSD_DATAR);
 134 }
 135
 136 /*
 137  * Common routines
 138  */
 139
 140 static void wbsd_init_device(struct wbsd_host* host)
 141 {
 142         u8 setup, ier;
 143
 144         /*
 145          * Reset chip (SD/MMC part) and fifo.
 146          */
 147         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 148         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
 149         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 150
 151         /*
 152          * Set DAT3 to input
 153          */
 154         setup &= ~WBSD_DAT3_H;
 155         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 156         host->flags &= ~WBSD_FIGNORE_DETECT;
 157
 158         /*
 159          * Read back default clock.
 160          */
 161         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
 162
 163         /*
 164          * Power down port.
 165          */
 166         outb(WBSD_POWER_N, host->base + WBSD_CSR);
 167
 168         /*
 169          * Set maximum timeout.
 170          */
 171         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
 172
 173         /*
 174          * Test for card presence
 175          */
 176         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
 177                 host->flags |= WBSD_FCARD_PRESENT;
 178         else
 179                 host->flags &= ~WBSD_FCARD_PRESENT;
 180
 181         /*
 182          * Enable interesting interrupts.
 183          */
 184         ier = 0;
 185         ier |= WBSD_EINT_CARD;
 186         ier |= WBSD_EINT_FIFO_THRE;
 187         ier |= WBSD_EINT_CCRC;
 188         ier |= WBSD_EINT_TIMEOUT;
 189         ier |= WBSD_EINT_CRC;
 190         ier |= WBSD_EINT_TC;
 191
 192         outb(ier, host->base + WBSD_EIR);
 193
 194         /*
 195          * Clear interrupts.
 196          */
 197         inb(host->base + WBSD_ISR);
 198 }
 199
 200 static void wbsd_reset(struct wbsd_host* host)
 201 {
 202         u8 setup;
 203
 204         printk(KERN_ERR DRIVER_NAME ": Resetting chip\n");
 205
 206         /*
 207          * Soft reset of chip (SD/MMC part).
 208          */
 209         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 210         setup |= WBSD_SOFT_RESET;
 211         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 212 }
 213
 214 static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq)
 215 {
 216         unsigned long dmaflags;
 217
 218         DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 219
 220         if (host->dma >= 0)
 221         {
 222                 /*
 223                  * Release ISA DMA controller.
 224                  */
 225                 dmaflags = claim_dma_lock();
 226                 disable_dma(host->dma);
 227                 clear_dma_ff(host->dma);
 228                 release_dma_lock(dmaflags);
 229
 230                 /*
 231                  * Disable DMA on host.
 232                  */
 233                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 234         }
 235
 236         host->mrq = NULL;
 237
 238         /*
 239          * MMC layer might call back into the driver so first unlock.
 240          */
 241         spin_unlock(&host->lock);
 242         mmc_request_done(host->mmc, mrq);
 243         spin_lock(&host->lock);
 244 }
 245
 246 /*
 247  * Scatter/gather functions
 248  */
 249
 250 static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data)
 251 {
 252         /*
 253          * Get info. about SG list from data structure.
 254          */
 255         host->cur_sg = data->sg;
 256         host->num_sg = data->sg_len;
 257
 258         host->offset = 0;
 259         host->remain = host->cur_sg->length;
 260 }
 261
 262 static inline int wbsd_next_sg(struct wbsd_host* host)
 263 {
 264         /*
 265          * Skip to next SG entry.
 266          */
 267         host->cur_sg++;
 268         host->num_sg--;
 269
 270         /*
 271          * Any entries left?
 272          */
 273         if (host->num_sg > 0)
 274           {
 275             host->offset = 0;
 276             host->remain = host->cur_sg->length;
 277           }
 278
 279         return host->num_sg;
 280 }
 281
 282 static inline char* wbsd_kmap_sg(struct wbsd_host* host)
 283 {
 284         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
 285                 host->cur_sg->offset;
 286         return host->mapped_sg;
 287 }
 288
 289 static inline void wbsd_kunmap_sg(struct wbsd_host* host)
 290 {
 291         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
 292 }
 293
 294 static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data)
 295 {
 296         unsigned int len, i, size;
 297         struct scatterlist* sg;
 298         char* dmabuf = host->dma_buffer;
 299         char* sgbuf;
 300
 301         size = host->size;
 302
 303         sg = data->sg;
 304         len = data->sg_len;
 305
 306         /*
 307          * Just loop through all entries. Size might not
 308          * be the entire list though so make sure that
 309          * we do not transfer too much.
 310          */
 311         for (i = 0;i < len;i++)
 312         {
 313                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
 314                 if (size < sg[i].length)
 315                         memcpy(dmabuf, sgbuf, size);
 316                 else
 317                         memcpy(dmabuf, sgbuf, sg[i].length);
 318                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
 319                 dmabuf += sg[i].length;
 320
 321                 if (size < sg[i].length)
 322                         size = 0;
 323                 else
 324                         size -= sg[i].length;
 325
 326                 if (size == 0)
 327                         break;
 328         }
 329
 330         /*
 331          * Check that we didn't get a request to transfer
 332          * more data than can fit into the SG list.
 333          */
 334
 335         BUG_ON(size != 0);
 336
 337         host->size -= size;
 338 }
 339
 340 static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data)
 341 {
 342         unsigned int len, i, size;
 343         struct scatterlist* sg;
 344         char* dmabuf = host->dma_buffer;
 345         char* sgbuf;
 346
 347         size = host->size;
 348
 349         sg = data->sg;
 350         len = data->sg_len;
 351
 352         /*
 353          * Just loop through all entries. Size might not
 354          * be the entire list though so make sure that
 355          * we do not transfer too much.
 356          */
 357         for (i = 0;i < len;i++)
 358         {
 359                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
 360                 if (size < sg[i].length)
 361                         memcpy(sgbuf, dmabuf, size);
 362                 else
 363                         memcpy(sgbuf, dmabuf, sg[i].length);
 364                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
 365                 dmabuf += sg[i].length;
 366
 367                 if (size < sg[i].length)
 368                         size = 0;
 369                 else
 370                         size -= sg[i].length;
 371
 372                 if (size == 0)
 373                         break;
 374         }
 375
 376         /*
 377          * Check that we didn't get a request to transfer
 378          * more data than can fit into the SG list.
 379          */
 380
 381         BUG_ON(size != 0);
 382
 383         host->size -= size;
 384 }
 385
 386 /*
 387  * Command handling
 388  */
 389
 390 static inline void wbsd_get_short_reply(struct wbsd_host* host,
 391         struct mmc_command* cmd)
 392 {
 393         /*
 394          * Correct response type?
 395          */
 396         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT)
 397         {
 398                 cmd->error = MMC_ERR_INVALID;
 399                 return;
 400         }
 401
 402         cmd->resp[0] =
 403                 wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
 404         cmd->resp[0] |=
 405                 wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
 406         cmd->resp[0] |=
 407                 wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
 408         cmd->resp[0] |=
 409                 wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
 410         cmd->resp[1] =
 411                 wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
 412 }
 413
 414 static inline void wbsd_get_long_reply(struct wbsd_host* host,
 415         struct mmc_command* cmd)
 416 {
 417         int i;
 418
 419         /*
 420          * Correct response type?
 421          */
 422         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG)
 423         {
 424                 cmd->error = MMC_ERR_INVALID;
 425                 return;
 426         }
 427
 428         for (i = 0;i < 4;i++)
 429         {
 430                 cmd->resp[i] =
 431                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
 432                 cmd->resp[i] |=
 433                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
 434                 cmd->resp[i] |=
 435                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
 436                 cmd->resp[i] |=
 437                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
 438         }
 439 }
 440
 441 static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd)
 442 {
 443         int i;
 444         u8 status, isr;
 445
 446         DBGF("Sending cmd (%x)\n", cmd->opcode);
 447
 448         /*
 449          * Clear accumulated ISR. The interrupt routine
 450          * will fill this one with events that occur during
 451          * transfer.
 452          */
 453         host->isr = 0;
 454
 455         /*
 456          * Send the command (CRC calculated by host).
 457          */
 458         outb(cmd->opcode, host->base + WBSD_CMDR);
 459         for (i = 3;i >= 0;i--)
 460                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
 461
 462         cmd->error = MMC_ERR_NONE;
 463
 464         /*
 465          * Wait for the request to complete.
 466          */
 467         do {
 468                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 469         } while (status & WBSD_CARDTRAFFIC);
 470
 471         /*
 472          * Do we expect a reply?
 473          */
 474         if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE)
 475         {
 476                 /*
 477                  * Read back status.
 478                  */
 479                 isr = host->isr;
 480
 481                 /* Card removed? */
 482                 if (isr & WBSD_INT_CARD)
 483                         cmd->error = MMC_ERR_TIMEOUT;
 484                 /* Timeout? */
 485                 else if (isr & WBSD_INT_TIMEOUT)
 486                         cmd->error = MMC_ERR_TIMEOUT;
 487                 /* CRC? */
 488                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 489                         cmd->error = MMC_ERR_BADCRC;
 490                 /* All ok */
 491                 else
 492                 {
 493                         if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT)
 494                                 wbsd_get_short_reply(host, cmd);
 495                         else
 496                                 wbsd_get_long_reply(host, cmd);
 497                 }
 498         }
 499
 500         DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
 501 }
 502
 503 /*
 504  * Data functions
 505  */
 506
 507 static void wbsd_empty_fifo(struct wbsd_host* host)
 508 {
 509         struct mmc_data* data = host->mrq->cmd->data;
 510         char* buffer;
 511         int i, fsr, fifo;
 512
 513         /*
 514          * Handle excessive data.
 515          */
 516         if (data->bytes_xfered == host->size)
 517                 return;
 518
 519         buffer = wbsd_kmap_sg(host) + host->offset;
 520
 521         /*
 522          * Drain the fifo. This has a tendency to loop longer
 523          * than the FIFO length (usually one block).
 524          */
 525         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY))
 526         {
 527                 /*
 528                  * The size field in the FSR is broken so we have to
 529                  * do some guessing.
 530                  */
 531                 if (fsr & WBSD_FIFO_FULL)
 532                         fifo = 16;
 533                 else if (fsr & WBSD_FIFO_FUTHRE)
 534                         fifo = 8;
 535                 else
 536                         fifo = 1;
 537
 538                 for (i = 0;i < fifo;i++)
 539                 {
 540                         *buffer = inb(host->base + WBSD_DFR);
 541                         buffer++;
 542                         host->offset++;
 543                         host->remain--;
 544
 545                         data->bytes_xfered++;
 546
 547                         /*
 548                          * Transfer done?
 549                          */
 550                         if (data->bytes_xfered == host->size)
 551                         {
 552                                 wbsd_kunmap_sg(host);
 553                                 return;
 554                         }
 555
 556                         /*
 557                          * End of scatter list entry?
 558                          */
 559                         if (host->remain == 0)
 560                         {
 561                                 wbsd_kunmap_sg(host);
 562
 563                                 /*
 564                                  * Get next entry. Check if last.
 565                                  */
 566                                 if (!wbsd_next_sg(host))
 567                                 {
 568                                         /*
 569                                          * We should never reach this point.
 570                                          * It means that we're trying to
 571                                          * transfer more blocks than can fit
 572                                          * into the scatter list.
 573                                          */
 574                                         BUG_ON(1);
 575
 576                                         host->size = data->bytes_xfered;
 577
 578                                         return;
 579                                 }
 580
 581                                 buffer = wbsd_kmap_sg(host);
 582                         }
 583                 }
 584         }
 585
 586         wbsd_kunmap_sg(host);
 587
 588         /*
 589          * This is a very dirty hack to solve a
 590          * hardware problem. The chip doesn't trigger
 591          * FIFO threshold interrupts properly.
 592          */
 593         if ((host->size - data->bytes_xfered) < 16)
 594                 tasklet_schedule(&host->fifo_tasklet);
 595 }
 596
 597 static void wbsd_fill_fifo(struct wbsd_host* host)
 598 {
 599         struct mmc_data* data = host->mrq->cmd->data;
 600         char* buffer;
 601         int i, fsr, fifo;
 602
 603         /*
 604          * Check that we aren't being called after the
 605          * entire buffer has been transfered.
 606          */
 607         if (data->bytes_xfered == host->size)
 608                 return;
 609
 610         buffer = wbsd_kmap_sg(host) + host->offset;
 611
 612         /*
 613          * Fill the fifo. This has a tendency to loop longer
 614          * than the FIFO length (usually one block).
 615          */
 616         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL))
 617         {
 618                 /*
 619                  * The size field in the FSR is broken so we have to
 620                  * do some guessing.
 621                  */
 622                 if (fsr & WBSD_FIFO_EMPTY)
 623                         fifo = 0;
 624                 else if (fsr & WBSD_FIFO_EMTHRE)
 625                         fifo = 8;
 626                 else
 627                         fifo = 15;
 628
 629                 for (i = 16;i > fifo;i--)
 630                 {
 631                         outb(*buffer, host->base + WBSD_DFR);
 632                         buffer++;
 633                         host->offset++;
 634                         host->remain--;
 635
 636                         data->bytes_xfered++;
 637
 638                         /*
 639                          * Transfer done?
 640                          */
 641                         if (data->bytes_xfered == host->size)
 642                         {
 643                                 wbsd_kunmap_sg(host);
 644                                 return;
 645                         }
 646
 647                         /*
 648                          * End of scatter list entry?
 649                          */
 650                         if (host->remain == 0)
 651                         {
 652                                 wbsd_kunmap_sg(host);
 653
 654                                 /*
 655                                  * Get next entry. Check if last.
 656                                  */
 657                                 if (!wbsd_next_sg(host))
 658                                 {
 659                                         /*
 660                                          * We should never reach this point.
 661                                          * It means that we're trying to
 662                                          * transfer more blocks than can fit
 663                                          * into the scatter list.
 664                                          */
 665                                         BUG_ON(1);
 666
 667                                         host->size = data->bytes_xfered;
 668
 669                                         return;
 670                                 }
 671
 672                                 buffer = wbsd_kmap_sg(host);
 673                         }
 674                 }
 675         }
 676
 677         wbsd_kunmap_sg(host);
 678
 679         /*
 680          * The controller stops sending interrupts for
 681          * 'FIFO empty' under certain conditions. So we
 682          * need to be a bit more pro-active.
 683          */
 684         tasklet_schedule(&host->fifo_tasklet);
 685 }
 686
 687 static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
 688 {
 689         u16 blksize;
 690         u8 setup;
 691         unsigned long dmaflags;
 692
 693         DBGF("blksz %04x blks %04x flags %08x\n",
 694                 1 << data->blksz_bits, data->blocks, data->flags);
 695         DBGF("tsac %d ms nsac %d clk\n",
 696                 data->timeout_ns / 1000000, data->timeout_clks);
 697
 698         /*
 699          * Calculate size.
 700          */
 701         host->size = data->blocks << data->blksz_bits;
 702
 703         /*
 704          * Check timeout values for overflow.
 705          * (Yes, some cards cause this value to overflow).
 706          */
 707         if (data->timeout_ns > 127000000)
 708                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
 709         else
 710                 wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000);
 711
 712         if (data->timeout_clks > 255)
 713                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
 714         else
 715                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
 716
 717         /*
 718          * Inform the chip of how large blocks will be
 719          * sent. It needs this to determine when to
 720          * calculate CRC.
 721          *
 722          * Space for CRC must be included in the size.
 723          * Two bytes are needed for each data line.
 724          */
 725         if (host->bus_width == MMC_BUS_WIDTH_1)
 726         {
 727                 blksize = (1 << data->blksz_bits) + 2;
 728
 729                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 730                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 731         }
 732         else if (host->bus_width == MMC_BUS_WIDTH_4)
 733         {
 734                 blksize = (1 << data->blksz_bits) + 2 * 4;
 735
 736                 wbsd_write_index(host, WBSD_IDX_PBSMSB, ((blksize >> 4) & 0xF0)
 737                         | WBSD_DATA_WIDTH);
 738                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 739         }
 740         else
 741         {
 742                 data->error = MMC_ERR_INVALID;
 743                 return;
 744         }
 745
 746         /*
 747          * Clear the FIFO. This is needed even for DMA
 748          * transfers since the chip still uses the FIFO
 749          * internally.
 750          */
 751         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 752         setup |= WBSD_FIFO_RESET;
 753         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 754
 755         /*
 756          * DMA transfer?
 757          */
 758         if (host->dma >= 0)
 759         {
 760                 /*
 761                  * The buffer for DMA is only 64 kB.
 762                  */
 763                 BUG_ON(host->size > 0x10000);
 764                 if (host->size > 0x10000)
 765                 {
 766                         data->error = MMC_ERR_INVALID;
 767                         return;
 768                 }
 769
 770                 /*
 771                  * Transfer data from the SG list to
 772                  * the DMA buffer.
 773                  */
 774                 if (data->flags & MMC_DATA_WRITE)
 775                         wbsd_sg_to_dma(host, data);
 776
 777                 /*
 778                  * Initialise the ISA DMA controller.
 779                  */
 780                 dmaflags = claim_dma_lock();
 781                 disable_dma(host->dma);
 782                 clear_dma_ff(host->dma);
 783                 if (data->flags & MMC_DATA_READ)
 784                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 785                 else
 786                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 787                 set_dma_addr(host->dma, host->dma_addr);
 788                 set_dma_count(host->dma, host->size);
 789
 790                 enable_dma(host->dma);
 791                 release_dma_lock(dmaflags);
 792
 793                 /*
 794                  * Enable DMA on the host.
 795                  */
 796                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 797         }
 798         else
 799         {
 800                 /*
 801                  * This flag is used to keep printk
 802                  * output to a minimum.
 803                  */
 804                 host->firsterr = 1;
 805
 806                 /*
 807                  * Initialise the SG list.
 808                  */
 809                 wbsd_init_sg(host, data);
 810
 811                 /*
 812                  * Turn off DMA.
 813                  */
 814                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 815
 816                 /*
 817                  * Set up FIFO threshold levels (and fill
 818                  * buffer if doing a write).
 819                  */
 820                 if (data->flags & MMC_DATA_READ)
 821                 {
 822                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 823                                 WBSD_FIFOEN_FULL | 8);
 824                 }
 825                 else
 826                 {
 827                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 828                                 WBSD_FIFOEN_EMPTY | 8);
 829                         wbsd_fill_fifo(host);
 830                 }
 831         }
 832
 833         data->error = MMC_ERR_NONE;
 834 }
 835
 836 static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
 837 {
 838         unsigned long dmaflags;
 839         int count;
 840         u8 status;
 841
 842         WARN_ON(host->mrq == NULL);
 843
 844         /*
 845          * Send a stop command if needed.
 846          */
 847         if (data->stop)
 848                 wbsd_send_command(host, data->stop);
 849
 850         /*
 851          * Wait for the controller to leave data
 852          * transfer state.
 853          */
 854         do
 855         {
 856                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 857         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 858
 859         /*
 860          * DMA transfer?
 861          */
 862         if (host->dma >= 0)
 863         {
 864                 /*
 865                  * Disable DMA on the host.
 866                  */
 867                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 868
 869                 /*
 870                  * Turn of ISA DMA controller.
 871                  */
 872                 dmaflags = claim_dma_lock();
 873                 disable_dma(host->dma);
 874                 clear_dma_ff(host->dma);
 875                 count = get_dma_residue(host->dma);
 876                 release_dma_lock(dmaflags);
 877
 878                 /*
 879                  * Any leftover data?
 880                  */
 881                 if (count)
 882                 {
 883                         printk(KERN_ERR DRIVER_NAME ": Incomplete DMA "
 884                                 "transfer. %d bytes left.\n", count);
 885
 886                         data->error = MMC_ERR_FAILED;
 887                 }
 888                 else
 889                 {
 890                         /*
 891                          * Transfer data from DMA buffer to
 892                          * SG list.
 893                          */
 894                         if (data->flags & MMC_DATA_READ)
 895                                 wbsd_dma_to_sg(host, data);
 896
 897                         data->bytes_xfered = host->size;
 898                 }
 899         }
 900
 901         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 902
 903         wbsd_request_end(host, host->mrq);
 904 }
 905
 906 /*****************************************************************************\
 907  *                                                                           *
 908  * MMC layer callbacks                                                       *
 909  *                                                                           *
 910 \*****************************************************************************/
 911
 912 static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
 913 {
 914         struct wbsd_host* host = mmc_priv(mmc);
 915         struct mmc_command* cmd;
 916
 917         /*
 918          * Disable tasklets to avoid a deadlock.
 919          */
 920         spin_lock_bh(&host->lock);
 921
 922         BUG_ON(host->mrq != NULL);
 923
 924         cmd = mrq->cmd;
 925
 926         host->mrq = mrq;
 927
 928         /*
 929          * If there is no card in the slot then
 930          * timeout immediatly.
 931          */
 932         if (!(host->flags & WBSD_FCARD_PRESENT))
 933         {
 934                 cmd->error = MMC_ERR_TIMEOUT;
 935                 goto done;
 936         }
 937
 938         /*
 939          * Does the request include data?
 940          */
 941         if (cmd->data)
 942         {
 943                 wbsd_prepare_data(host, cmd->data);
 944
 945                 if (cmd->data->error != MMC_ERR_NONE)
 946                         goto done;
 947         }
 948
 949         wbsd_send_command(host, cmd);
 950
 951         /*
 952          * If this is a data transfer the request
 953          * will be finished after the data has
 954          * transfered.
 955          */
 956         if (cmd->data && (cmd->error == MMC_ERR_NONE))
 957         {
 958                 /*
 959                  * Dirty fix for hardware bug.
 960                  */
 961                 if (host->dma == -1)
 962                         tasklet_schedule(&host->fifo_tasklet);
 963
 964                 spin_unlock_bh(&host->lock);
 965
 966                 return;
 967         }
 968
 969 done:
 970         wbsd_request_end(host, mrq);
 971
 972         spin_unlock_bh(&host->lock);
 973 }
 974
 975 static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 976 {
 977         struct wbsd_host* host = mmc_priv(mmc);
 978         u8 clk, setup, pwr;
 979
 980         DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
 981              ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
 982              ios->vdd, ios->bus_width);
 983
 984         spin_lock_bh(&host->lock);
 985
 986         /*
 987          * Reset the chip on each power off.
 988          * Should clear out any weird states.
 989          */
 990         if (ios->power_mode == MMC_POWER_OFF)
 991                 wbsd_init_device(host);
 992
 993         if (ios->clock >= 24000000)
 994                 clk = WBSD_CLK_24M;
 995         else if (ios->clock >= 16000000)
 996                 clk = WBSD_CLK_16M;
 997         else if (ios->clock >= 12000000)
 998                 clk = WBSD_CLK_12M;
 999         else
1000                 clk = WBSD_CLK_375K;
1001
1002         /*
1003          * Only write to the clock register when
1004          * there is an actual change.
1005          */
1006         if (clk != host->clk)
1007         {
1008                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
1009                 host->clk = clk;
1010         }
1011
1012         /*
1013          * Power up card.
1014          */
1015         if (ios->power_mode != MMC_POWER_OFF)
1016         {
1017                 pwr = inb(host->base + WBSD_CSR);
1018                 pwr &= ~WBSD_POWER_N;
1019                 outb(pwr, host->base + WBSD_CSR);
1020         }
1021
1022         /*
1023          * MMC cards need to have pin 1 high during init.
1024          * It wreaks havoc with the card detection though so
1025          * that needs to be disabled.
1026          */
1027         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
1028         if (ios->chip_select == MMC_CS_HIGH)
1029         {
1030                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
1031                 setup |= WBSD_DAT3_H;
1032                 host->flags |= WBSD_FIGNORE_DETECT;
1033         }
1034         else
1035         {
1036                 setup &= ~WBSD_DAT3_H;
1037
1038                 /*
1039                  * We cannot resume card detection immediatly
1040                  * because of capacitance and delays in the chip.
1041                  */
1042                 mod_timer(&host->ignore_timer, jiffies + HZ/100);
1043         }
1044         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1045
1046         /*
1047          * Store bus width for later. Will be used when
1048          * setting up the data transfer.
1049          */
1050         host->bus_width = ios->bus_width;
1051
1052         spin_unlock_bh(&host->lock);
1053 }
1054
1055 static int wbsd_get_ro(struct mmc_host* mmc)
1056 {
1057         struct wbsd_host* host = mmc_priv(mmc);
1058         u8 csr;
1059
1060         spin_lock_bh(&host->lock);
1061
1062         csr = inb(host->base + WBSD_CSR);
1063         csr |= WBSD_MSLED;
1064         outb(csr, host->base + WBSD_CSR);
1065
1066         mdelay(1);
1067
1068         csr = inb(host->base + WBSD_CSR);
1069         csr &= ~WBSD_MSLED;
1070         outb(csr, host->base + WBSD_CSR);
1071
1072         spin_unlock_bh(&host->lock);
1073
1074         return csr & WBSD_WRPT;
1075 }
1076
1077 static struct mmc_host_ops wbsd_ops = {
1078         .request        = wbsd_request,
1079         .set_ios        = wbsd_set_ios,
1080         .get_ro         = wbsd_get_ro,
1081 };
1082
1083 /*****************************************************************************\
1084  *                                                                           *
1085  * Interrupt handling                                                        *
1086  *                                                                           *
1087 \*****************************************************************************/
1088
1089 /*
1090  * Helper function to reset detection ignore
1091  */
1092
1093 static void wbsd_reset_ignore(unsigned long data)
1094 {
1095         struct wbsd_host *host = (struct wbsd_host*)data;
1096
1097         BUG_ON(host == NULL);
1098
1099         DBG("Resetting card detection ignore\n");
1100
1101         spin_lock_bh(&host->lock);
1102
1103         host->flags &= ~WBSD_FIGNORE_DETECT;
1104
1105         /*
1106          * Card status might have changed during the
1107          * blackout.
1108          */
1109         tasklet_schedule(&host->card_tasklet);
1110
1111         spin_unlock_bh(&host->lock);
1112 }
1113
1114 /*
1115  * Helper function for card detection
1116  */
1117 static void wbsd_detect_card(unsigned long data)
1118 {
1119         struct wbsd_host *host = (struct wbsd_host*)data;
1120
1121         BUG_ON(host == NULL);
1122
1123         DBG("Executing card detection\n");
1124
1125         mmc_detect_change(host->mmc);
1126 }
1127
1128 /*
1129  * Tasklets
1130  */
1131
1132 static inline struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1133 {
1134         WARN_ON(!host->mrq);
1135         if (!host->mrq)
1136                 return NULL;
1137
1138         WARN_ON(!host->mrq->cmd);
1139         if (!host->mrq->cmd)
1140                 return NULL;
1141
1142         WARN_ON(!host->mrq->cmd->data);
1143         if (!host->mrq->cmd->data)
1144                 return NULL;
1145
1146         return host->mrq->cmd->data;
1147 }
1148
1149 static void wbsd_tasklet_card(unsigned long param)
1150 {
1151         struct wbsd_host* host = (struct wbsd_host*)param;
1152         u8 csr;
1153
1154         spin_lock(&host->lock);
1155
1156         if (host->flags & WBSD_FIGNORE_DETECT)
1157         {
1158                 spin_unlock(&host->lock);
1159                 return;
1160         }
1161
1162         csr = inb(host->base + WBSD_CSR);
1163         WARN_ON(csr == 0xff);
1164
1165         if (csr & WBSD_CARDPRESENT)
1166         {
1167                 if (!(host->flags & WBSD_FCARD_PRESENT))
1168                 {
1169                         DBG("Card inserted\n");
1170                         host->flags |= WBSD_FCARD_PRESENT;
1171
1172                         /*
1173                          * Delay card detection to allow electrical connections
1174                          * to stabilise.
1175                          */
1176                         mod_timer(&host->detect_timer, jiffies + HZ/2);
1177                 }
1178
1179                 spin_unlock(&host->lock);
1180         }
1181         else if (host->flags & WBSD_FCARD_PRESENT)
1182         {
1183                 DBG("Card removed\n");
1184                 host->flags &= ~WBSD_FCARD_PRESENT;
1185
1186                 if (host->mrq)
1187                 {
1188                         printk(KERN_ERR DRIVER_NAME
1189                                 ": Card removed during transfer!\n");
1190                         wbsd_reset(host);
1191
1192                         host->mrq->cmd->error = MMC_ERR_FAILED;
1193                         tasklet_schedule(&host->finish_tasklet);
1194                 }
1195
1196                 /*
1197                  * Unlock first since we might get a call back.
1198                  */
1199                 spin_unlock(&host->lock);
1200
1201                 mmc_detect_change(host->mmc);
1202         }
1203         else
1204                 spin_unlock(&host->lock);
1205 }
1206
1207 static void wbsd_tasklet_fifo(unsigned long param)
1208 {
1209         struct wbsd_host* host = (struct wbsd_host*)param;
1210         struct mmc_data* data;
1211
1212         spin_lock(&host->lock);
1213
1214         if (!host->mrq)
1215                 goto end;
1216
1217         data = wbsd_get_data(host);
1218         if (!data)
1219                 goto end;
1220
1221         if (data->flags & MMC_DATA_WRITE)
1222                 wbsd_fill_fifo(host);
1223         else
1224                 wbsd_empty_fifo(host);
1225
1226         /*
1227          * Done?
1228          */
1229         if (host->size == data->bytes_xfered)
1230         {
1231                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1232                 tasklet_schedule(&host->finish_tasklet);
1233         }
1234
1235 end:
1236         spin_unlock(&host->lock);
1237 }
1238
1239 static void wbsd_tasklet_crc(unsigned long param)
1240 {
1241         struct wbsd_host* host = (struct wbsd_host*)param;
1242         struct mmc_data* data;
1243
1244         spin_lock(&host->lock);
1245
1246         if (!host->mrq)
1247                 goto end;
1248
1249         data = wbsd_get_data(host);
1250         if (!data)
1251                 goto end;
1252
1253         DBGF("CRC error\n");
1254
1255         data->error = MMC_ERR_BADCRC;
1256
1257         tasklet_schedule(&host->finish_tasklet);
1258
1259 end:
1260         spin_unlock(&host->lock);
1261 }
1262
1263 static void wbsd_tasklet_timeout(unsigned long param)
1264 {
1265         struct wbsd_host* host = (struct wbsd_host*)param;
1266         struct mmc_data* data;
1267
1268         spin_lock(&host->lock);
1269
1270         if (!host->mrq)
1271                 goto end;
1272
1273         data = wbsd_get_data(host);
1274         if (!data)
1275                 goto end;
1276
1277         DBGF("Timeout\n");
1278
1279         data->error = MMC_ERR_TIMEOUT;
1280
1281         tasklet_schedule(&host->finish_tasklet);
1282
1283 end:
1284         spin_unlock(&host->lock);
1285 }
1286
1287 static void wbsd_tasklet_finish(unsigned long param)
1288 {
1289         struct wbsd_host* host = (struct wbsd_host*)param;
1290         struct mmc_data* data;
1291
1292         spin_lock(&host->lock);
1293
1294         WARN_ON(!host->mrq);
1295         if (!host->mrq)
1296                 goto end;
1297
1298         data = wbsd_get_data(host);
1299         if (!data)
1300                 goto end;
1301
1302         wbsd_finish_data(host, data);
1303
1304 end:
1305         spin_unlock(&host->lock);
1306 }
1307
1308 static void wbsd_tasklet_block(unsigned long param)
1309 {
1310         struct wbsd_host* host = (struct wbsd_host*)param;
1311         struct mmc_data* data;
1312
1313         spin_lock(&host->lock);
1314
1315         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1316                 WBSD_CRC_OK)
1317         {
1318                 data = wbsd_get_data(host);
1319                 if (!data)
1320                         goto end;
1321
1322                 DBGF("CRC error\n");
1323
1324                 data->error = MMC_ERR_BADCRC;
1325
1326                 tasklet_schedule(&host->finish_tasklet);
1327         }
1328
1329 end:
1330         spin_unlock(&host->lock);
1331 }
1332
1333 /*
1334  * Interrupt handling
1335  */
1336
1337 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1338 {
1339         struct wbsd_host* host = dev_id;
1340         int isr;
1341
1342         isr = inb(host->base + WBSD_ISR);
1343
1344         /*
1345          * Was it actually our hardware that caused the interrupt?
1346          */
1347         if (isr == 0xff || isr == 0x00)
1348                 return IRQ_NONE;
1349
1350         host->isr |= isr;
1351
1352         /*
1353          * Schedule tasklets as needed.
1354          */
1355         if (isr & WBSD_INT_CARD)
1356                 tasklet_schedule(&host->card_tasklet);
1357         if (isr & WBSD_INT_FIFO_THRE)
1358                 tasklet_schedule(&host->fifo_tasklet);
1359         if (isr & WBSD_INT_CRC)
1360                 tasklet_hi_schedule(&host->crc_tasklet);
1361         if (isr & WBSD_INT_TIMEOUT)
1362                 tasklet_hi_schedule(&host->timeout_tasklet);
1363         if (isr & WBSD_INT_BUSYEND)
1364                 tasklet_hi_schedule(&host->block_tasklet);
1365         if (isr & WBSD_INT_TC)
1366                 tasklet_schedule(&host->finish_tasklet);
1367
1368         return IRQ_HANDLED;
1369 }
1370
1371 /*****************************************************************************\
1372  *                                                                           *
1373  * Device initialisation and shutdown                                        *
1374  *                                                                           *
1375 \*****************************************************************************/
1376
1377 /*
1378  * Allocate/free MMC structure.
1379  */
1380
1381 static int __devinit wbsd_alloc_mmc(struct device* dev)
1382 {
1383         struct mmc_host* mmc;
1384         struct wbsd_host* host;
1385
1386         /*
1387          * Allocate MMC structure.
1388          */
1389         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1390         if (!mmc)
1391                 return -ENOMEM;
1392
1393         host = mmc_priv(mmc);
1394         host->mmc = mmc;
1395
1396         host->dma = -1;
1397
1398         /*
1399          * Set host parameters.
1400          */
1401         mmc->ops = &wbsd_ops;
1402         mmc->f_min = 375000;
1403         mmc->f_max = 24000000;
1404         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1405         mmc->caps = MMC_CAP_4_BIT_DATA;
1406
1407         spin_lock_init(&host->lock);
1408
1409         /*
1410          * Set up timers
1411          */
1412         init_timer(&host->detect_timer);
1413         host->detect_timer.data = (unsigned long)host;
1414         host->detect_timer.function = wbsd_detect_card;
1415
1416         init_timer(&host->ignore_timer);
1417         host->ignore_timer.data = (unsigned long)host;
1418         host->ignore_timer.function = wbsd_reset_ignore;
1419
1420         /*
1421          * Maximum number of segments. Worst case is one sector per segment
1422          * so this will be 64kB/512.
1423          */
1424         mmc->max_hw_segs = 128;
1425         mmc->max_phys_segs = 128;
1426
1427         /*
1428          * Maximum number of sectors in one transfer. Also limited by 64kB
1429          * buffer.
1430          */
1431         mmc->max_sectors = 128;
1432
1433         /*
1434          * Maximum segment size. Could be one segment with the maximum number
1435          * of segments.
1436          */
1437         mmc->max_seg_size = mmc->max_sectors * 512;
1438
1439         dev_set_drvdata(dev, mmc);
1440
1441         return 0;
1442 }
1443
1444 static void __devexit wbsd_free_mmc(struct device* dev)
1445 {
1446         struct mmc_host* mmc;
1447         struct wbsd_host* host;
1448
1449         mmc = dev_get_drvdata(dev);
1450         if (!mmc)
1451                 return;
1452
1453         host = mmc_priv(mmc);
1454         BUG_ON(host == NULL);
1455
1456         del_timer_sync(&host->ignore_timer);
1457         del_timer_sync(&host->detect_timer);
1458
1459         mmc_free_host(mmc);
1460
1461         dev_set_drvdata(dev, NULL);
1462 }
1463
1464 /*
1465  * Scan for known chip id:s
1466  */
1467
1468 static int __devinit wbsd_scan(struct wbsd_host* host)
1469 {
1470         int i, j, k;
1471         int id;
1472
1473         /*
1474          * Iterate through all ports, all codes to
1475          * find hardware that is in our known list.
1476          */
1477         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1478         {
1479                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1480                         continue;
1481
1482                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1483                 {
1484                         id = 0xFFFF;
1485
1486                         outb(unlock_codes[j], config_ports[i]);
1487                         outb(unlock_codes[j], config_ports[i]);
1488
1489                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1490                         id = inb(config_ports[i] + 1) << 8;
1491
1492                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1493                         id |= inb(config_ports[i] + 1);
1494
1495                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1496                         {
1497                                 if (id == valid_ids[k])
1498                                 {
1499                                         host->chip_id = id;
1500                                         host->config = config_ports[i];
1501                                         host->unlock_code = unlock_codes[i];
1502
1503                                         return 0;
1504                                 }
1505                         }
1506
1507                         if (id != 0xFFFF)
1508                         {
1509                                 DBG("Unknown hardware (id %x) found at %x\n",
1510                                         id, config_ports[i]);
1511                         }
1512
1513                         outb(LOCK_CODE, config_ports[i]);
1514                 }
1515
1516                 release_region(config_ports[i], 2);
1517         }
1518
1519         return -ENODEV;
1520 }
1521
1522 /*
1523  * Allocate/free io port ranges
1524  */
1525
1526 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1527 {
1528         if (io & 0x7)
1529                 return -EINVAL;
1530
1531         if (!request_region(base, 8, DRIVER_NAME))
1532                 return -EIO;
1533
1534         host->base = io;
1535
1536         return 0;
1537 }
1538
1539 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1540 {
1541         if (host->base)
1542                 release_region(host->base, 8);
1543
1544         host->base = 0;
1545
1546         if (host->config)
1547                 release_region(host->config, 2);
1548
1549         host->config = 0;
1550 }
1551
1552 /*
1553  * Allocate/free DMA port and buffer
1554  */
1555
1556 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1557 {
1558         if (dma < 0)
1559                 return;
1560
1561         if (request_dma(dma, DRIVER_NAME))
1562                 goto err;
1563
1564         /*
1565          * We need to allocate a special buffer in
1566          * order for ISA to be able to DMA to it.
1567          */
1568         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1569                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1570         if (!host->dma_buffer)
1571                 goto free;
1572
1573         /*
1574          * Translate the address to a physical address.
1575          */
1576         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1577                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1578
1579         /*
1580          * ISA DMA must be aligned on a 64k basis.
1581          */
1582         if ((host->dma_addr & 0xffff) != 0)
1583                 goto kfree;
1584         /*
1585          * ISA cannot access memory above 16 MB.
1586          */
1587         else if (host->dma_addr >= 0x1000000)
1588                 goto kfree;
1589
1590         host->dma = dma;
1591
1592         return;
1593
1594 kfree:
1595         /*
1596          * If we've gotten here then there is some kind of alignment bug
1597          */
1598         BUG_ON(1);
1599
1600         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1601                 DMA_BIDIRECTIONAL);
1602         host->dma_addr = (dma_addr_t)NULL;
1603
1604         kfree(host->dma_buffer);
1605         host->dma_buffer = NULL;
1606
1607 free:
1608         free_dma(dma);
1609
1610 err:
1611         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1612                 "Falling back on FIFO.\n", dma);
1613 }
1614
1615 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1616 {
1617         if (host->dma_addr)
1618                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1619                         DMA_BIDIRECTIONAL);
1620         if (host->dma_buffer)
1621                 kfree(host->dma_buffer);
1622         if (host->dma >= 0)
1623                 free_dma(host->dma);
1624
1625         host->dma = -1;
1626         host->dma_buffer = NULL;
1627         host->dma_addr = (dma_addr_t)NULL;
1628 }
1629
1630 /*
1631  * Allocate/free IRQ.
1632  */
1633
1634 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1635 {
1636         int ret;
1637
1638         /*
1639          * Allocate interrupt.
1640          */
1641
1642         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1643         if (ret)
1644                 return ret;
1645
1646         host->irq = irq;
1647
1648         /*
1649          * Set up tasklets.
1650          */
1651         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1652         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1653         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1654         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1655         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1656         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1657
1658         return 0;
1659 }
1660
1661 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1662 {
1663         if (!host->irq)
1664                 return;
1665
1666         free_irq(host->irq, host);
1667
1668         host->irq = 0;
1669
1670         tasklet_kill(&host->card_tasklet);
1671         tasklet_kill(&host->fifo_tasklet);
1672         tasklet_kill(&host->crc_tasklet);
1673         tasklet_kill(&host->timeout_tasklet);
1674         tasklet_kill(&host->finish_tasklet);
1675         tasklet_kill(&host->block_tasklet);
1676 }
1677
1678 /*
1679  * Allocate all resources for the host.
1680  */
1681
1682 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1683         int base, int irq, int dma)
1684 {
1685         int ret;
1686
1687         /*
1688          * Allocate I/O ports.
1689          */
1690         ret = wbsd_request_region(host, base);
1691         if (ret)
1692                 return ret;
1693
1694         /*
1695          * Allocate interrupt.
1696          */
1697         ret = wbsd_request_irq(host, irq);
1698         if (ret)
1699                 return ret;
1700
1701         /*
1702          * Allocate DMA.
1703          */
1704         wbsd_request_dma(host, dma);
1705
1706         return 0;
1707 }
1708
1709 /*
1710  * Release all resources for the host.
1711  */
1712
1713 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1714 {
1715         wbsd_release_dma(host);
1716         wbsd_release_irq(host);
1717         wbsd_release_regions(host);
1718 }
1719
1720 /*
1721  * Configure the resources the chip should use.
1722  */
1723
1724 static void __devinit wbsd_chip_config(struct wbsd_host* host)
1725 {
1726         /*
1727          * Reset the chip.
1728          */
1729         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1730         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1731
1732         /*
1733          * Select SD/MMC function.
1734          */
1735         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1736
1737         /*
1738          * Set up card detection.
1739          */
1740         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1741
1742         /*
1743          * Configure chip
1744          */
1745         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1746         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1747
1748         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1749
1750         if (host->dma >= 0)
1751                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1752
1753         /*
1754          * Enable and power up chip.
1755          */
1756         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1757         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1758 }
1759
1760 /*
1761  * Check that configured resources are correct.
1762  */
1763
1764 static int __devinit wbsd_chip_validate(struct wbsd_host* host)
1765 {
1766         int base, irq, dma;
1767
1768         /*
1769          * Select SD/MMC function.
1770          */
1771         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1772
1773         /*
1774          * Read configuration.
1775          */
1776         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1777         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1778
1779         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1780
1781         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1782
1783         /*
1784          * Validate against given configuration.
1785          */
1786         if (base != host->base)
1787                 return 0;
1788         if (irq != host->irq)
1789                 return 0;
1790         if ((dma != host->dma) && (host->dma != -1))
1791                 return 0;
1792
1793         return 1;
1794 }
1795
1796 /*****************************************************************************\
1797  *                                                                           *
1798  * Devices setup and shutdown                                                *
1799  *                                                                           *
1800 \*****************************************************************************/
1801
1802 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1803         int pnp)
1804 {
1805         struct wbsd_host* host = NULL;
1806         struct mmc_host* mmc = NULL;
1807         int ret;
1808
1809         ret = wbsd_alloc_mmc(dev);
1810         if (ret)
1811                 return ret;
1812
1813         mmc = dev_get_drvdata(dev);
1814         host = mmc_priv(mmc);
1815
1816         /*
1817          * Scan for hardware.
1818          */
1819         ret = wbsd_scan(host);
1820         if (ret)
1821         {
1822                 if (pnp && (ret == -ENODEV))
1823                 {
1824                         printk(KERN_WARNING DRIVER_NAME
1825                                 ": Unable to confirm device presence. You may "
1826                                 "experience lock-ups.\n");
1827                 }
1828                 else
1829                 {
1830                         wbsd_free_mmc(dev);
1831                         return ret;
1832                 }
1833         }
1834
1835         /*
1836          * Request resources.
1837          */
1838         ret = wbsd_request_resources(host, io, irq, dma);
1839         if (ret)
1840         {
1841                 wbsd_release_resources(host);
1842                 wbsd_free_mmc(dev);
1843                 return ret;
1844         }
1845
1846         /*
1847          * See if chip needs to be configured.
1848          */
1849         if (pnp && (host->config != 0))
1850         {
1851                 if (!wbsd_chip_validate(host))
1852                 {
1853                         printk(KERN_WARNING DRIVER_NAME
1854                                 ": PnP active but chip not configured! "
1855                                 "You probably have a buggy BIOS. "
1856                                 "Configuring chip manually.\n");
1857                         wbsd_chip_config(host);
1858                 }
1859         }
1860         else
1861                 wbsd_chip_config(host);
1862
1863         /*
1864          * Power Management stuff. No idea how this works.
1865          * Not tested.
1866          */
1867 #ifdef CONFIG_PM
1868         if (host->config)
1869                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1870 #endif
1871         /*
1872          * Allow device to initialise itself properly.
1873          */
1874         mdelay(5);
1875
1876         /*
1877          * Reset the chip into a known state.
1878          */
1879         wbsd_init_device(host);
1880
1881         mmc_add_host(mmc);
1882
1883         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1884         if (host->chip_id != 0)
1885                 printk(" id %x", (int)host->chip_id);
1886         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1887         if (host->dma >= 0)
1888                 printk(" dma %d", (int)host->dma);
1889         else
1890                 printk(" FIFO");
1891         if (pnp)
1892                 printk(" PnP");
1893         printk("\n");
1894
1895         return 0;
1896 }
1897
1898 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1899 {
1900         struct mmc_host* mmc = dev_get_drvdata(dev);
1901         struct wbsd_host* host;
1902
1903         if (!mmc)
1904                 return;
1905
1906         host = mmc_priv(mmc);
1907
1908         mmc_remove_host(mmc);
1909
1910         if (!pnp)
1911         {
1912                 /*
1913                  * Power down the SD/MMC function.
1914                  */
1915                 wbsd_unlock_config(host);
1916                 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1917                 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1918                 wbsd_lock_config(host);
1919         }
1920
1921         wbsd_release_resources(host);
1922
1923         wbsd_free_mmc(dev);
1924 }
1925
1926 /*
1927  * Non-PnP
1928  */
1929
1930 static int __devinit wbsd_probe(struct device* dev)
1931 {
1932         return wbsd_init(dev, io, irq, dma, 0);
1933 }
1934
1935 static int __devexit wbsd_remove(struct device* dev)
1936 {
1937         wbsd_shutdown(dev, 0);
1938
1939         return 0;
1940 }
1941
1942 /*
1943  * PnP
1944  */
1945
1946 #ifdef CONFIG_PNP
1947
1948 static int __devinit
1949 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1950 {
1951         int io, irq, dma;
1952
1953         /*
1954          * Get resources from PnP layer.
1955          */
1956         io = pnp_port_start(pnpdev, 0);
1957         irq = pnp_irq(pnpdev, 0);
1958         if (pnp_dma_valid(pnpdev, 0))
1959                 dma = pnp_dma(pnpdev, 0);
1960         else
1961                 dma = -1;
1962
1963         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1964
1965         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1966 }
1967
1968 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1969 {
1970         wbsd_shutdown(&dev->dev, 1);
1971 }
1972
1973 #endif /* CONFIG_PNP */
1974
1975 /*
1976  * Power management
1977  */
1978
1979 #ifdef CONFIG_PM
1980 static int wbsd_suspend(struct device *dev, pm_message_t state, u32 level)
1981 {
1982         DBGF("Not yet supported\n");
1983
1984         return 0;
1985 }
1986
1987 static int wbsd_resume(struct device *dev, u32 level)
1988 {
1989         DBGF("Not yet supported\n");
1990
1991         return 0;
1992 }
1993 #else
1994 #define wbsd_suspend NULL
1995 #define wbsd_resume NULL
1996 #endif
1997
1998 static struct platform_device *wbsd_device;
1999
2000 static struct device_driver wbsd_driver = {
2001         .name           = DRIVER_NAME,
2002         .bus            = &platform_bus_type,
2003         .probe          = wbsd_probe,
2004         .remove         = wbsd_remove,
2005
2006         .suspend        = wbsd_suspend,
2007         .resume         = wbsd_resume,
2008 };
2009
2010 #ifdef CONFIG_PNP
2011
2012 static struct pnp_driver wbsd_pnp_driver = {
2013         .name           = DRIVER_NAME,
2014         .id_table       = pnp_dev_table,
2015         .probe          = wbsd_pnp_probe,
2016         .remove         = wbsd_pnp_remove,
2017 };
2018
2019 #endif /* CONFIG_PNP */
2020
2021 /*
2022  * Module loading/unloading
2023  */
2024
2025 static int __init wbsd_drv_init(void)
2026 {
2027         int result;
2028
2029         printk(KERN_INFO DRIVER_NAME
2030                 ": Winbond W83L51xD SD/MMC card interface driver, "
2031                 DRIVER_VERSION "\n");
2032         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2033
2034 #ifdef CONFIG_PNP
2035
2036         if (!nopnp)
2037         {
2038                 result = pnp_register_driver(&wbsd_pnp_driver);
2039                 if (result < 0)
2040                         return result;
2041         }
2042
2043 #endif /* CONFIG_PNP */
2044
2045         if (nopnp)
2046         {
2047                 result = driver_register(&wbsd_driver);
2048                 if (result < 0)
2049                         return result;
2050
2051                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
2052                         NULL, 0);
2053                 if (IS_ERR(wbsd_device))
2054                         return PTR_ERR(wbsd_device);
2055         }
2056
2057         return 0;
2058 }
2059
2060 static void __exit wbsd_drv_exit(void)
2061 {
2062 #ifdef CONFIG_PNP
2063
2064         if (!nopnp)
2065                 pnp_unregister_driver(&wbsd_pnp_driver);
2066
2067 #endif /* CONFIG_PNP */
2068
2069         if (nopnp)
2070         {
2071                 platform_device_unregister(wbsd_device);
2072
2073                 driver_unregister(&wbsd_driver);
2074         }
2075
2076         DBG("unloaded\n");
2077 }
2078
2079 module_init(wbsd_drv_init);
2080 module_exit(wbsd_drv_exit);
2081 #ifdef CONFIG_PNP
2082 module_param(nopnp, uint, 0444);
2083 #endif
2084 module_param(io, uint, 0444);
2085 module_param(irq, uint, 0444);
2086 module_param(dma, int, 0444);
2087
2088 MODULE_LICENSE("GPL");
2089 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2090 MODULE_VERSION(DRIVER_VERSION);
2091
2092 #ifdef CONFIG_PNP
2093 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2094 #endif
2095 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2096 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2097 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");