drivers/mmc/wbsd.c

   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 "1.2"
  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          */
 724         blksize = (1 << data->blksz_bits) + 2;
 725
 726         wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 727         wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 728
 729         /*
 730          * Clear the FIFO. This is needed even for DMA
 731          * transfers since the chip still uses the FIFO
 732          * internally.
 733          */
 734         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 735         setup |= WBSD_FIFO_RESET;
 736         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 737
 738         /*
 739          * DMA transfer?
 740          */
 741         if (host->dma >= 0)
 742         {
 743                 /*
 744                  * The buffer for DMA is only 64 kB.
 745                  */
 746                 BUG_ON(host->size > 0x10000);
 747                 if (host->size > 0x10000)
 748                 {
 749                         data->error = MMC_ERR_INVALID;
 750                         return;
 751                 }
 752
 753                 /*
 754                  * Transfer data from the SG list to
 755                  * the DMA buffer.
 756                  */
 757                 if (data->flags & MMC_DATA_WRITE)
 758                         wbsd_sg_to_dma(host, data);
 759
 760                 /*
 761                  * Initialise the ISA DMA controller.
 762                  */
 763                 dmaflags = claim_dma_lock();
 764                 disable_dma(host->dma);
 765                 clear_dma_ff(host->dma);
 766                 if (data->flags & MMC_DATA_READ)
 767                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 768                 else
 769                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 770                 set_dma_addr(host->dma, host->dma_addr);
 771                 set_dma_count(host->dma, host->size);
 772
 773                 enable_dma(host->dma);
 774                 release_dma_lock(dmaflags);
 775
 776                 /*
 777                  * Enable DMA on the host.
 778                  */
 779                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 780         }
 781         else
 782         {
 783                 /*
 784                  * This flag is used to keep printk
 785                  * output to a minimum.
 786                  */
 787                 host->firsterr = 1;
 788
 789                 /*
 790                  * Initialise the SG list.
 791                  */
 792                 wbsd_init_sg(host, data);
 793
 794                 /*
 795                  * Turn off DMA.
 796                  */
 797                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 798
 799                 /*
 800                  * Set up FIFO threshold levels (and fill
 801                  * buffer if doing a write).
 802                  */
 803                 if (data->flags & MMC_DATA_READ)
 804                 {
 805                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 806                                 WBSD_FIFOEN_FULL | 8);
 807                 }
 808                 else
 809                 {
 810                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 811                                 WBSD_FIFOEN_EMPTY | 8);
 812                         wbsd_fill_fifo(host);
 813                 }
 814         }
 815
 816         data->error = MMC_ERR_NONE;
 817 }
 818
 819 static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
 820 {
 821         unsigned long dmaflags;
 822         int count;
 823         u8 status;
 824
 825         WARN_ON(host->mrq == NULL);
 826
 827         /*
 828          * Send a stop command if needed.
 829          */
 830         if (data->stop)
 831                 wbsd_send_command(host, data->stop);
 832
 833         /*
 834          * Wait for the controller to leave data
 835          * transfer state.
 836          */
 837         do
 838         {
 839                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 840         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 841
 842         /*
 843          * DMA transfer?
 844          */
 845         if (host->dma >= 0)
 846         {
 847                 /*
 848                  * Disable DMA on the host.
 849                  */
 850                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 851
 852                 /*
 853                  * Turn of ISA DMA controller.
 854                  */
 855                 dmaflags = claim_dma_lock();
 856                 disable_dma(host->dma);
 857                 clear_dma_ff(host->dma);
 858                 count = get_dma_residue(host->dma);
 859                 release_dma_lock(dmaflags);
 860
 861                 /*
 862                  * Any leftover data?
 863                  */
 864                 if (count)
 865                 {
 866                         printk(KERN_ERR DRIVER_NAME ": Incomplete DMA "
 867                                 "transfer. %d bytes left.\n", count);
 868
 869                         data->error = MMC_ERR_FAILED;
 870                 }
 871                 else
 872                 {
 873                         /*
 874                          * Transfer data from DMA buffer to
 875                          * SG list.
 876                          */
 877                         if (data->flags & MMC_DATA_READ)
 878                                 wbsd_dma_to_sg(host, data);
 879
 880                         data->bytes_xfered = host->size;
 881                 }
 882         }
 883
 884         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 885
 886         wbsd_request_end(host, host->mrq);
 887 }
 888
 889 /*****************************************************************************\
 890  *                                                                           *
 891  * MMC layer callbacks                                                       *
 892  *                                                                           *
 893 \*****************************************************************************/
 894
 895 static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
 896 {
 897         struct wbsd_host* host = mmc_priv(mmc);
 898         struct mmc_command* cmd;
 899
 900         /*
 901          * Disable tasklets to avoid a deadlock.
 902          */
 903         spin_lock_bh(&host->lock);
 904
 905         BUG_ON(host->mrq != NULL);
 906
 907         cmd = mrq->cmd;
 908
 909         host->mrq = mrq;
 910
 911         /*
 912          * If there is no card in the slot then
 913          * timeout immediatly.
 914          */
 915         if (!(host->flags & WBSD_FCARD_PRESENT))
 916         {
 917                 cmd->error = MMC_ERR_TIMEOUT;
 918                 goto done;
 919         }
 920
 921         /*
 922          * Does the request include data?
 923          */
 924         if (cmd->data)
 925         {
 926                 wbsd_prepare_data(host, cmd->data);
 927
 928                 if (cmd->data->error != MMC_ERR_NONE)
 929                         goto done;
 930         }
 931
 932         wbsd_send_command(host, cmd);
 933
 934         /*
 935          * If this is a data transfer the request
 936          * will be finished after the data has
 937          * transfered.
 938          */
 939         if (cmd->data && (cmd->error == MMC_ERR_NONE))
 940         {
 941                 /*
 942                  * Dirty fix for hardware bug.
 943                  */
 944                 if (host->dma == -1)
 945                         tasklet_schedule(&host->fifo_tasklet);
 946
 947                 spin_unlock_bh(&host->lock);
 948
 949                 return;
 950         }
 951
 952 done:
 953         wbsd_request_end(host, mrq);
 954
 955         spin_unlock_bh(&host->lock);
 956 }
 957
 958 static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 959 {
 960         struct wbsd_host* host = mmc_priv(mmc);
 961         u8 clk, setup, pwr;
 962
 963         DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
 964                 ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
 965
 966         spin_lock_bh(&host->lock);
 967
 968         /*
 969          * Reset the chip on each power off.
 970          * Should clear out any weird states.
 971          */
 972         if (ios->power_mode == MMC_POWER_OFF)
 973                 wbsd_init_device(host);
 974
 975         if (ios->clock >= 24000000)
 976                 clk = WBSD_CLK_24M;
 977         else if (ios->clock >= 16000000)
 978                 clk = WBSD_CLK_16M;
 979         else if (ios->clock >= 12000000)
 980                 clk = WBSD_CLK_12M;
 981         else
 982                 clk = WBSD_CLK_375K;
 983
 984         /*
 985          * Only write to the clock register when
 986          * there is an actual change.
 987          */
 988         if (clk != host->clk)
 989         {
 990                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
 991                 host->clk = clk;
 992         }
 993
 994         /*
 995          * Power up card.
 996          */
 997         if (ios->power_mode != MMC_POWER_OFF)
 998         {
 999                 pwr = inb(host->base + WBSD_CSR);
1000                 pwr &= ~WBSD_POWER_N;
1001                 outb(pwr, host->base + WBSD_CSR);
1002         }
1003
1004         /*
1005          * MMC cards need to have pin 1 high during init.
1006          * Init time corresponds rather nicely with the bus mode.
1007          * It wreaks havoc with the card detection though so
1008          * that needs to be disabed.
1009          */
1010         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
1011         if ((ios->power_mode == MMC_POWER_ON) &&
1012                 (ios->bus_mode == MMC_BUSMODE_OPENDRAIN))
1013         {
1014                 setup |= WBSD_DAT3_H;
1015                 host->flags |= WBSD_FIGNORE_DETECT;
1016         }
1017         else
1018         {
1019                 setup &= ~WBSD_DAT3_H;
1020                 host->flags &= ~WBSD_FIGNORE_DETECT;
1021         }
1022         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1023
1024         spin_unlock_bh(&host->lock);
1025 }
1026
1027 static struct mmc_host_ops wbsd_ops = {
1028         .request        = wbsd_request,
1029         .set_ios        = wbsd_set_ios,
1030 };
1031
1032 /*****************************************************************************\
1033  *                                                                           *
1034  * Interrupt handling                                                        *
1035  *                                                                           *
1036 \*****************************************************************************/
1037
1038 /*
1039  * Helper function for card detection
1040  */
1041 static void wbsd_detect_card(unsigned long data)
1042 {
1043         struct wbsd_host *host = (struct wbsd_host*)data;
1044
1045         BUG_ON(host == NULL);
1046
1047         DBG("Executing card detection\n");
1048
1049         mmc_detect_change(host->mmc);
1050 }
1051
1052 /*
1053  * Tasklets
1054  */
1055
1056 static inline struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1057 {
1058         WARN_ON(!host->mrq);
1059         if (!host->mrq)
1060                 return NULL;
1061
1062         WARN_ON(!host->mrq->cmd);
1063         if (!host->mrq->cmd)
1064                 return NULL;
1065
1066         WARN_ON(!host->mrq->cmd->data);
1067         if (!host->mrq->cmd->data)
1068                 return NULL;
1069
1070         return host->mrq->cmd->data;
1071 }
1072
1073 static void wbsd_tasklet_card(unsigned long param)
1074 {
1075         struct wbsd_host* host = (struct wbsd_host*)param;
1076         u8 csr;
1077
1078         spin_lock(&host->lock);
1079
1080         if (host->flags & WBSD_FIGNORE_DETECT)
1081         {
1082                 spin_unlock(&host->lock);
1083                 return;
1084         }
1085
1086         csr = inb(host->base + WBSD_CSR);
1087         WARN_ON(csr == 0xff);
1088
1089         if (csr & WBSD_CARDPRESENT)
1090         {
1091                 if (!(host->flags & WBSD_FCARD_PRESENT))
1092                 {
1093                         DBG("Card inserted\n");
1094                         host->flags |= WBSD_FCARD_PRESENT;
1095
1096                         /*
1097                          * Delay card detection to allow electrical connections
1098                          * to stabilise.
1099                          */
1100                         mod_timer(&host->timer, jiffies + HZ/2);
1101                 }
1102
1103                 spin_unlock(&host->lock);
1104         }
1105         else if (host->flags & WBSD_FCARD_PRESENT)
1106         {
1107                 DBG("Card removed\n");
1108                 host->flags &= ~WBSD_FCARD_PRESENT;
1109
1110                 if (host->mrq)
1111                 {
1112                         printk(KERN_ERR DRIVER_NAME
1113                                 ": Card removed during transfer!\n");
1114                         wbsd_reset(host);
1115
1116                         host->mrq->cmd->error = MMC_ERR_FAILED;
1117                         tasklet_schedule(&host->finish_tasklet);
1118                 }
1119
1120                 /*
1121                  * Unlock first since we might get a call back.
1122                  */
1123                 spin_unlock(&host->lock);
1124
1125                 mmc_detect_change(host->mmc);
1126         }
1127 }
1128
1129 static void wbsd_tasklet_fifo(unsigned long param)
1130 {
1131         struct wbsd_host* host = (struct wbsd_host*)param;
1132         struct mmc_data* data;
1133
1134         spin_lock(&host->lock);
1135
1136         if (!host->mrq)
1137                 goto end;
1138
1139         data = wbsd_get_data(host);
1140         if (!data)
1141                 goto end;
1142
1143         if (data->flags & MMC_DATA_WRITE)
1144                 wbsd_fill_fifo(host);
1145         else
1146                 wbsd_empty_fifo(host);
1147
1148         /*
1149          * Done?
1150          */
1151         if (host->size == data->bytes_xfered)
1152         {
1153                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1154                 tasklet_schedule(&host->finish_tasklet);
1155         }
1156
1157 end:
1158         spin_unlock(&host->lock);
1159 }
1160
1161 static void wbsd_tasklet_crc(unsigned long param)
1162 {
1163         struct wbsd_host* host = (struct wbsd_host*)param;
1164         struct mmc_data* data;
1165
1166         spin_lock(&host->lock);
1167
1168         if (!host->mrq)
1169                 goto end;
1170
1171         data = wbsd_get_data(host);
1172         if (!data)
1173                 goto end;
1174
1175         DBGF("CRC error\n");
1176
1177         data->error = MMC_ERR_BADCRC;
1178
1179         tasklet_schedule(&host->finish_tasklet);
1180
1181 end:
1182         spin_unlock(&host->lock);
1183 }
1184
1185 static void wbsd_tasklet_timeout(unsigned long param)
1186 {
1187         struct wbsd_host* host = (struct wbsd_host*)param;
1188         struct mmc_data* data;
1189
1190         spin_lock(&host->lock);
1191
1192         if (!host->mrq)
1193                 goto end;
1194
1195         data = wbsd_get_data(host);
1196         if (!data)
1197                 goto end;
1198
1199         DBGF("Timeout\n");
1200
1201         data->error = MMC_ERR_TIMEOUT;
1202
1203         tasklet_schedule(&host->finish_tasklet);
1204
1205 end:
1206         spin_unlock(&host->lock);
1207 }
1208
1209 static void wbsd_tasklet_finish(unsigned long param)
1210 {
1211         struct wbsd_host* host = (struct wbsd_host*)param;
1212         struct mmc_data* data;
1213
1214         spin_lock(&host->lock);
1215
1216         WARN_ON(!host->mrq);
1217         if (!host->mrq)
1218                 goto end;
1219
1220         data = wbsd_get_data(host);
1221         if (!data)
1222                 goto end;
1223
1224         wbsd_finish_data(host, data);
1225
1226 end:
1227         spin_unlock(&host->lock);
1228 }
1229
1230 static void wbsd_tasklet_block(unsigned long param)
1231 {
1232         struct wbsd_host* host = (struct wbsd_host*)param;
1233         struct mmc_data* data;
1234
1235         spin_lock(&host->lock);
1236
1237         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1238                 WBSD_CRC_OK)
1239         {
1240                 data = wbsd_get_data(host);
1241                 if (!data)
1242                         goto end;
1243
1244                 DBGF("CRC error\n");
1245
1246                 data->error = MMC_ERR_BADCRC;
1247
1248                 tasklet_schedule(&host->finish_tasklet);
1249         }
1250
1251 end:
1252         spin_unlock(&host->lock);
1253 }
1254
1255 /*
1256  * Interrupt handling
1257  */
1258
1259 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1260 {
1261         struct wbsd_host* host = dev_id;
1262         int isr;
1263
1264         isr = inb(host->base + WBSD_ISR);
1265
1266         /*
1267          * Was it actually our hardware that caused the interrupt?
1268          */
1269         if (isr == 0xff || isr == 0x00)
1270                 return IRQ_NONE;
1271
1272         host->isr |= isr;
1273
1274         /*
1275          * Schedule tasklets as needed.
1276          */
1277         if (isr & WBSD_INT_CARD)
1278                 tasklet_schedule(&host->card_tasklet);
1279         if (isr & WBSD_INT_FIFO_THRE)
1280                 tasklet_schedule(&host->fifo_tasklet);
1281         if (isr & WBSD_INT_CRC)
1282                 tasklet_hi_schedule(&host->crc_tasklet);
1283         if (isr & WBSD_INT_TIMEOUT)
1284                 tasklet_hi_schedule(&host->timeout_tasklet);
1285         if (isr & WBSD_INT_BUSYEND)
1286                 tasklet_hi_schedule(&host->block_tasklet);
1287         if (isr & WBSD_INT_TC)
1288                 tasklet_schedule(&host->finish_tasklet);
1289
1290         return IRQ_HANDLED;
1291 }
1292
1293 /*****************************************************************************\
1294  *                                                                           *
1295  * Device initialisation and shutdown                                        *
1296  *                                                                           *
1297 \*****************************************************************************/
1298
1299 /*
1300  * Allocate/free MMC structure.
1301  */
1302
1303 static int __devinit wbsd_alloc_mmc(struct device* dev)
1304 {
1305         struct mmc_host* mmc;
1306         struct wbsd_host* host;
1307
1308         /*
1309          * Allocate MMC structure.
1310          */
1311         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1312         if (!mmc)
1313                 return -ENOMEM;
1314
1315         host = mmc_priv(mmc);
1316         host->mmc = mmc;
1317
1318         host->dma = -1;
1319
1320         /*
1321          * Set host parameters.
1322          */
1323         mmc->ops = &wbsd_ops;
1324         mmc->f_min = 375000;
1325         mmc->f_max = 24000000;
1326         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1327
1328         spin_lock_init(&host->lock);
1329
1330         /*
1331          * Set up detection timer
1332          */
1333         init_timer(&host->timer);
1334         host->timer.data = (unsigned long)host;
1335         host->timer.function = wbsd_detect_card;
1336
1337         /*
1338          * Maximum number of segments. Worst case is one sector per segment
1339          * so this will be 64kB/512.
1340          */
1341         mmc->max_hw_segs = 128;
1342         mmc->max_phys_segs = 128;
1343
1344         /*
1345          * Maximum number of sectors in one transfer. Also limited by 64kB
1346          * buffer.
1347          */
1348         mmc->max_sectors = 128;
1349
1350         /*
1351          * Maximum segment size. Could be one segment with the maximum number
1352          * of segments.
1353          */
1354         mmc->max_seg_size = mmc->max_sectors * 512;
1355
1356         dev_set_drvdata(dev, mmc);
1357
1358         return 0;
1359 }
1360
1361 static void __devexit wbsd_free_mmc(struct device* dev)
1362 {
1363         struct mmc_host* mmc;
1364         struct wbsd_host* host;
1365
1366         mmc = dev_get_drvdata(dev);
1367         if (!mmc)
1368                 return;
1369
1370         host = mmc_priv(mmc);
1371         BUG_ON(host == NULL);
1372
1373         del_timer_sync(&host->timer);
1374
1375         mmc_free_host(mmc);
1376
1377         dev_set_drvdata(dev, NULL);
1378 }
1379
1380 /*
1381  * Scan for known chip id:s
1382  */
1383
1384 static int __devinit wbsd_scan(struct wbsd_host* host)
1385 {
1386         int i, j, k;
1387         int id;
1388
1389         /*
1390          * Iterate through all ports, all codes to
1391          * find hardware that is in our known list.
1392          */
1393         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1394         {
1395                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1396                         continue;
1397
1398                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1399                 {
1400                         id = 0xFFFF;
1401
1402                         outb(unlock_codes[j], config_ports[i]);
1403                         outb(unlock_codes[j], config_ports[i]);
1404
1405                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1406                         id = inb(config_ports[i] + 1) << 8;
1407
1408                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1409                         id |= inb(config_ports[i] + 1);
1410
1411                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1412                         {
1413                                 if (id == valid_ids[k])
1414                                 {
1415                                         host->chip_id = id;
1416                                         host->config = config_ports[i];
1417                                         host->unlock_code = unlock_codes[i];
1418
1419                                         return 0;
1420                                 }
1421                         }
1422
1423                         if (id != 0xFFFF)
1424                         {
1425                                 DBG("Unknown hardware (id %x) found at %x\n",
1426                                         id, config_ports[i]);
1427                         }
1428
1429                         outb(LOCK_CODE, config_ports[i]);
1430                 }
1431
1432                 release_region(config_ports[i], 2);
1433         }
1434
1435         return -ENODEV;
1436 }
1437
1438 /*
1439  * Allocate/free io port ranges
1440  */
1441
1442 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1443 {
1444         if (io & 0x7)
1445                 return -EINVAL;
1446
1447         if (!request_region(base, 8, DRIVER_NAME))
1448                 return -EIO;
1449
1450         host->base = io;
1451
1452         return 0;
1453 }
1454
1455 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1456 {
1457         if (host->base)
1458                 release_region(host->base, 8);
1459
1460         host->base = 0;
1461
1462         if (host->config)
1463                 release_region(host->config, 2);
1464
1465         host->config = 0;
1466 }
1467
1468 /*
1469  * Allocate/free DMA port and buffer
1470  */
1471
1472 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1473 {
1474         if (dma < 0)
1475                 return;
1476
1477         if (request_dma(dma, DRIVER_NAME))
1478                 goto err;
1479
1480         /*
1481          * We need to allocate a special buffer in
1482          * order for ISA to be able to DMA to it.
1483          */
1484         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1485                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1486         if (!host->dma_buffer)
1487                 goto free;
1488
1489         /*
1490          * Translate the address to a physical address.
1491          */
1492         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1493                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1494
1495         /*
1496          * ISA DMA must be aligned on a 64k basis.
1497          */
1498         if ((host->dma_addr & 0xffff) != 0)
1499                 goto kfree;
1500         /*
1501          * ISA cannot access memory above 16 MB.
1502          */
1503         else if (host->dma_addr >= 0x1000000)
1504                 goto kfree;
1505
1506         host->dma = dma;
1507
1508         return;
1509
1510 kfree:
1511         /*
1512          * If we've gotten here then there is some kind of alignment bug
1513          */
1514         BUG_ON(1);
1515
1516         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1517                 DMA_BIDIRECTIONAL);
1518         host->dma_addr = (dma_addr_t)NULL;
1519
1520         kfree(host->dma_buffer);
1521         host->dma_buffer = NULL;
1522
1523 free:
1524         free_dma(dma);
1525
1526 err:
1527         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1528                 "Falling back on FIFO.\n", dma);
1529 }
1530
1531 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1532 {
1533         if (host->dma_addr)
1534                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1535                         DMA_BIDIRECTIONAL);
1536         if (host->dma_buffer)
1537                 kfree(host->dma_buffer);
1538         if (host->dma >= 0)
1539                 free_dma(host->dma);
1540
1541         host->dma = -1;
1542         host->dma_buffer = NULL;
1543         host->dma_addr = (dma_addr_t)NULL;
1544 }
1545
1546 /*
1547  * Allocate/free IRQ.
1548  */
1549
1550 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1551 {
1552         int ret;
1553
1554         /*
1555          * Allocate interrupt.
1556          */
1557
1558         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1559         if (ret)
1560                 return ret;
1561
1562         host->irq = irq;
1563
1564         /*
1565          * Set up tasklets.
1566          */
1567         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1568         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1569         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1570         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1571         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1572         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1573
1574         return 0;
1575 }
1576
1577 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1578 {
1579         if (!host->irq)
1580                 return;
1581
1582         free_irq(host->irq, host);
1583
1584         host->irq = 0;
1585
1586         tasklet_kill(&host->card_tasklet);
1587         tasklet_kill(&host->fifo_tasklet);
1588         tasklet_kill(&host->crc_tasklet);
1589         tasklet_kill(&host->timeout_tasklet);
1590         tasklet_kill(&host->finish_tasklet);
1591         tasklet_kill(&host->block_tasklet);
1592 }
1593
1594 /*
1595  * Allocate all resources for the host.
1596  */
1597
1598 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1599         int base, int irq, int dma)
1600 {
1601         int ret;
1602
1603         /*
1604          * Allocate I/O ports.
1605          */
1606         ret = wbsd_request_region(host, base);
1607         if (ret)
1608                 return ret;
1609
1610         /*
1611          * Allocate interrupt.
1612          */
1613         ret = wbsd_request_irq(host, irq);
1614         if (ret)
1615                 return ret;
1616
1617         /*
1618          * Allocate DMA.
1619          */
1620         wbsd_request_dma(host, dma);
1621
1622         return 0;
1623 }
1624
1625 /*
1626  * Release all resources for the host.
1627  */
1628
1629 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1630 {
1631         wbsd_release_dma(host);
1632         wbsd_release_irq(host);
1633         wbsd_release_regions(host);
1634 }
1635
1636 /*
1637  * Configure the resources the chip should use.
1638  */
1639
1640 static void __devinit wbsd_chip_config(struct wbsd_host* host)
1641 {
1642         /*
1643          * Reset the chip.
1644          */
1645         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1646         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1647
1648         /*
1649          * Select SD/MMC function.
1650          */
1651         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1652
1653         /*
1654          * Set up card detection.
1655          */
1656         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1657
1658         /*
1659          * Configure chip
1660          */
1661         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1662         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1663
1664         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1665
1666         if (host->dma >= 0)
1667                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1668
1669         /*
1670          * Enable and power up chip.
1671          */
1672         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1673         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1674 }
1675
1676 /*
1677  * Check that configured resources are correct.
1678  */
1679
1680 static int __devinit wbsd_chip_validate(struct wbsd_host* host)
1681 {
1682         int base, irq, dma;
1683
1684         /*
1685          * Select SD/MMC function.
1686          */
1687         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1688
1689         /*
1690          * Read configuration.
1691          */
1692         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1693         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1694
1695         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1696
1697         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1698
1699         /*
1700          * Validate against given configuration.
1701          */
1702         if (base != host->base)
1703                 return 0;
1704         if (irq != host->irq)
1705                 return 0;
1706         if ((dma != host->dma) && (host->dma != -1))
1707                 return 0;
1708
1709         return 1;
1710 }
1711
1712 /*****************************************************************************\
1713  *                                                                           *
1714  * Devices setup and shutdown                                                *
1715  *                                                                           *
1716 \*****************************************************************************/
1717
1718 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1719         int pnp)
1720 {
1721         struct wbsd_host* host = NULL;
1722         struct mmc_host* mmc = NULL;
1723         int ret;
1724
1725         ret = wbsd_alloc_mmc(dev);
1726         if (ret)
1727                 return ret;
1728
1729         mmc = dev_get_drvdata(dev);
1730         host = mmc_priv(mmc);
1731
1732         /*
1733          * Scan for hardware.
1734          */
1735         ret = wbsd_scan(host);
1736         if (ret)
1737         {
1738                 if (pnp && (ret == -ENODEV))
1739                 {
1740                         printk(KERN_WARNING DRIVER_NAME
1741                                 ": Unable to confirm device presence. You may "
1742                                 "experience lock-ups.\n");
1743                 }
1744                 else
1745                 {
1746                         wbsd_free_mmc(dev);
1747                         return ret;
1748                 }
1749         }
1750
1751         /*
1752          * Request resources.
1753          */
1754         ret = wbsd_request_resources(host, io, irq, dma);
1755         if (ret)
1756         {
1757                 wbsd_release_resources(host);
1758                 wbsd_free_mmc(dev);
1759                 return ret;
1760         }
1761
1762         /*
1763          * See if chip needs to be configured.
1764          */
1765         if (pnp && (host->config != 0))
1766         {
1767                 if (!wbsd_chip_validate(host))
1768                 {
1769                         printk(KERN_WARNING DRIVER_NAME
1770                                 ": PnP active but chip not configured! "
1771                                 "You probably have a buggy BIOS. "
1772                                 "Configuring chip manually.\n");
1773                         wbsd_chip_config(host);
1774                 }
1775         }
1776         else
1777                 wbsd_chip_config(host);
1778
1779         /*
1780          * Power Management stuff. No idea how this works.
1781          * Not tested.
1782          */
1783 #ifdef CONFIG_PM
1784         if (host->config)
1785                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1786 #endif
1787         /*
1788          * Allow device to initialise itself properly.
1789          */
1790         mdelay(5);
1791
1792         /*
1793          * Reset the chip into a known state.
1794          */
1795         wbsd_init_device(host);
1796
1797         mmc_add_host(mmc);
1798
1799         printk(KERN_INFO "%s: W83L51xD", mmc->host_name);
1800         if (host->chip_id != 0)
1801                 printk(" id %x", (int)host->chip_id);
1802         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1803         if (host->dma >= 0)
1804                 printk(" dma %d", (int)host->dma);
1805         else
1806                 printk(" FIFO");
1807         if (pnp)
1808                 printk(" PnP");
1809         printk("\n");
1810
1811         return 0;
1812 }
1813
1814 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1815 {
1816         struct mmc_host* mmc = dev_get_drvdata(dev);
1817         struct wbsd_host* host;
1818
1819         if (!mmc)
1820                 return;
1821
1822         host = mmc_priv(mmc);
1823
1824         mmc_remove_host(mmc);
1825
1826         if (!pnp)
1827         {
1828                 /*
1829                  * Power down the SD/MMC function.
1830                  */
1831                 wbsd_unlock_config(host);
1832                 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1833                 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1834                 wbsd_lock_config(host);
1835         }
1836
1837         wbsd_release_resources(host);
1838
1839         wbsd_free_mmc(dev);
1840 }
1841
1842 /*
1843  * Non-PnP
1844  */
1845
1846 static int __devinit wbsd_probe(struct device* dev)
1847 {
1848         return wbsd_init(dev, io, irq, dma, 0);
1849 }
1850
1851 static int __devexit wbsd_remove(struct device* dev)
1852 {
1853         wbsd_shutdown(dev, 0);
1854
1855         return 0;
1856 }
1857
1858 /*
1859  * PnP
1860  */
1861
1862 #ifdef CONFIG_PNP
1863
1864 static int __devinit
1865 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1866 {
1867         int io, irq, dma;
1868
1869         /*
1870          * Get resources from PnP layer.
1871          */
1872         io = pnp_port_start(pnpdev, 0);
1873         irq = pnp_irq(pnpdev, 0);
1874         if (pnp_dma_valid(pnpdev, 0))
1875                 dma = pnp_dma(pnpdev, 0);
1876         else
1877                 dma = -1;
1878
1879         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1880
1881         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1882 }
1883
1884 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1885 {
1886         wbsd_shutdown(&dev->dev, 1);
1887 }
1888
1889 #endif /* CONFIG_PNP */
1890
1891 /*
1892  * Power management
1893  */
1894
1895 #ifdef CONFIG_PM
1896 static int wbsd_suspend(struct device *dev, pm_message_t state, u32 level)
1897 {
1898         DBGF("Not yet supported\n");
1899
1900         return 0;
1901 }
1902
1903 static int wbsd_resume(struct device *dev, u32 level)
1904 {
1905         DBGF("Not yet supported\n");
1906
1907         return 0;
1908 }
1909 #else
1910 #define wbsd_suspend NULL
1911 #define wbsd_resume NULL
1912 #endif
1913
1914 static struct platform_device *wbsd_device;
1915
1916 static struct device_driver wbsd_driver = {
1917         .name           = DRIVER_NAME,
1918         .bus            = &platform_bus_type,
1919         .probe          = wbsd_probe,
1920         .remove         = wbsd_remove,
1921
1922         .suspend        = wbsd_suspend,
1923         .resume         = wbsd_resume,
1924 };
1925
1926 #ifdef CONFIG_PNP
1927
1928 static struct pnp_driver wbsd_pnp_driver = {
1929         .name           = DRIVER_NAME,
1930         .id_table       = pnp_dev_table,
1931         .probe          = wbsd_pnp_probe,
1932         .remove         = wbsd_pnp_remove,
1933 };
1934
1935 #endif /* CONFIG_PNP */
1936
1937 /*
1938  * Module loading/unloading
1939  */
1940
1941 static int __init wbsd_drv_init(void)
1942 {
1943         int result;
1944
1945         printk(KERN_INFO DRIVER_NAME
1946                 ": Winbond W83L51xD SD/MMC card interface driver, "
1947                 DRIVER_VERSION "\n");
1948         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1949
1950 #ifdef CONFIG_PNP
1951
1952         if (!nopnp)
1953         {
1954                 result = pnp_register_driver(&wbsd_pnp_driver);
1955                 if (result < 0)
1956                         return result;
1957         }
1958
1959 #endif /* CONFIG_PNP */
1960
1961         if (nopnp)
1962         {
1963                 result = driver_register(&wbsd_driver);
1964                 if (result < 0)
1965                         return result;
1966
1967                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
1968                         NULL, 0);
1969                 if (IS_ERR(wbsd_device))
1970                         return PTR_ERR(wbsd_device);
1971         }
1972
1973         return 0;
1974 }
1975
1976 static void __exit wbsd_drv_exit(void)
1977 {
1978 #ifdef CONFIG_PNP
1979
1980         if (!nopnp)
1981                 pnp_unregister_driver(&wbsd_pnp_driver);
1982
1983 #endif /* CONFIG_PNP */
1984
1985         if (nopnp)
1986         {
1987                 platform_device_unregister(wbsd_device);
1988
1989                 driver_unregister(&wbsd_driver);
1990         }
1991
1992         DBG("unloaded\n");
1993 }
1994
1995 module_init(wbsd_drv_init);
1996 module_exit(wbsd_drv_exit);
1997 #ifdef CONFIG_PNP
1998 module_param(nopnp, uint, 0444);
1999 #endif
2000 module_param(io, uint, 0444);
2001 module_param(irq, uint, 0444);
2002 module_param(dma, int, 0444);
2003
2004 MODULE_LICENSE("GPL");
2005 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2006 MODULE_VERSION(DRIVER_VERSION);
2007
2008 #ifdef CONFIG_PNP
2009 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2010 #endif
2011 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2012 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2013 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");