git.oblomov.eu Git - linux-2.6/blob - 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/platform_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 "%s: Resetting chip\n", mmc_hostname(host->mmc));
 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 "%s: Incomplete DMA transfer. "
 884                                 "%d bytes left.\n",
 885                                 mmc_hostname(host->mmc), count);
 886
 887                         data->error = MMC_ERR_FAILED;
 888                 }
 889                 else
 890                 {
 891                         /*
 892                          * Transfer data from DMA buffer to
 893                          * SG list.
 894                          */
 895                         if (data->flags & MMC_DATA_READ)
 896                                 wbsd_dma_to_sg(host, data);
 897
 898                         data->bytes_xfered = host->size;
 899                 }
 900         }
 901
 902         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 903
 904         wbsd_request_end(host, host->mrq);
 905 }
 906
 907 /*****************************************************************************\
 908  *                                                                           *
 909  * MMC layer callbacks                                                       *
 910  *                                                                           *
 911 \*****************************************************************************/
 912
 913 static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
 914 {
 915         struct wbsd_host* host = mmc_priv(mmc);
 916         struct mmc_command* cmd;
 917
 918         /*
 919          * Disable tasklets to avoid a deadlock.
 920          */
 921         spin_lock_bh(&host->lock);
 922
 923         BUG_ON(host->mrq != NULL);
 924
 925         cmd = mrq->cmd;
 926
 927         host->mrq = mrq;
 928
 929         /*
 930          * If there is no card in the slot then
 931          * timeout immediatly.
 932          */
 933         if (!(host->flags & WBSD_FCARD_PRESENT))
 934         {
 935                 cmd->error = MMC_ERR_TIMEOUT;
 936                 goto done;
 937         }
 938
 939         /*
 940          * Does the request include data?
 941          */
 942         if (cmd->data)
 943         {
 944                 wbsd_prepare_data(host, cmd->data);
 945
 946                 if (cmd->data->error != MMC_ERR_NONE)
 947                         goto done;
 948         }
 949
 950         wbsd_send_command(host, cmd);
 951
 952         /*
 953          * If this is a data transfer the request
 954          * will be finished after the data has
 955          * transfered.
 956          */
 957         if (cmd->data && (cmd->error == MMC_ERR_NONE))
 958         {
 959                 /*
 960                  * Dirty fix for hardware bug.
 961                  */
 962                 if (host->dma == -1)
 963                         tasklet_schedule(&host->fifo_tasklet);
 964
 965                 spin_unlock_bh(&host->lock);
 966
 967                 return;
 968         }
 969
 970 done:
 971         wbsd_request_end(host, mrq);
 972
 973         spin_unlock_bh(&host->lock);
 974 }
 975
 976 static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 977 {
 978         struct wbsd_host* host = mmc_priv(mmc);
 979         u8 clk, setup, pwr;
 980
 981         DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
 982              ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
 983              ios->vdd, ios->bus_width);
 984
 985         spin_lock_bh(&host->lock);
 986
 987         /*
 988          * Reset the chip on each power off.
 989          * Should clear out any weird states.
 990          */
 991         if (ios->power_mode == MMC_POWER_OFF)
 992                 wbsd_init_device(host);
 993
 994         if (ios->clock >= 24000000)
 995                 clk = WBSD_CLK_24M;
 996         else if (ios->clock >= 16000000)
 997                 clk = WBSD_CLK_16M;
 998         else if (ios->clock >= 12000000)
 999                 clk = WBSD_CLK_12M;
1000         else
1001                 clk = WBSD_CLK_375K;
1002
1003         /*
1004          * Only write to the clock register when
1005          * there is an actual change.
1006          */
1007         if (clk != host->clk)
1008         {
1009                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
1010                 host->clk = clk;
1011         }
1012
1013         /*
1014          * Power up card.
1015          */
1016         if (ios->power_mode != MMC_POWER_OFF)
1017         {
1018                 pwr = inb(host->base + WBSD_CSR);
1019                 pwr &= ~WBSD_POWER_N;
1020                 outb(pwr, host->base + WBSD_CSR);
1021         }
1022
1023         /*
1024          * MMC cards need to have pin 1 high during init.
1025          * It wreaks havoc with the card detection though so
1026          * that needs to be disabled.
1027          */
1028         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
1029         if (ios->chip_select == MMC_CS_HIGH)
1030         {
1031                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
1032                 setup |= WBSD_DAT3_H;
1033                 host->flags |= WBSD_FIGNORE_DETECT;
1034         }
1035         else
1036         {
1037                 if (setup & WBSD_DAT3_H)
1038                 {
1039                         setup &= ~WBSD_DAT3_H;
1040
1041                         /*
1042                          * We cannot resume card detection immediatly
1043                          * because of capacitance and delays in the chip.
1044                          */
1045                         mod_timer(&host->ignore_timer, jiffies + HZ/100);
1046                 }
1047         }
1048         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1049
1050         /*
1051          * Store bus width for later. Will be used when
1052          * setting up the data transfer.
1053          */
1054         host->bus_width = ios->bus_width;
1055
1056         spin_unlock_bh(&host->lock);
1057 }
1058
1059 static int wbsd_get_ro(struct mmc_host* mmc)
1060 {
1061         struct wbsd_host* host = mmc_priv(mmc);
1062         u8 csr;
1063
1064         spin_lock_bh(&host->lock);
1065
1066         csr = inb(host->base + WBSD_CSR);
1067         csr |= WBSD_MSLED;
1068         outb(csr, host->base + WBSD_CSR);
1069
1070         mdelay(1);
1071
1072         csr = inb(host->base + WBSD_CSR);
1073         csr &= ~WBSD_MSLED;
1074         outb(csr, host->base + WBSD_CSR);
1075
1076         spin_unlock_bh(&host->lock);
1077
1078         return csr & WBSD_WRPT;
1079 }
1080
1081 static struct mmc_host_ops wbsd_ops = {
1082         .request        = wbsd_request,
1083         .set_ios        = wbsd_set_ios,
1084         .get_ro         = wbsd_get_ro,
1085 };
1086
1087 /*****************************************************************************\
1088  *                                                                           *
1089  * Interrupt handling                                                        *
1090  *                                                                           *
1091 \*****************************************************************************/
1092
1093 /*
1094  * Helper function to reset detection ignore
1095  */
1096
1097 static void wbsd_reset_ignore(unsigned long data)
1098 {
1099         struct wbsd_host *host = (struct wbsd_host*)data;
1100
1101         BUG_ON(host == NULL);
1102
1103         DBG("Resetting card detection ignore\n");
1104
1105         spin_lock_bh(&host->lock);
1106
1107         host->flags &= ~WBSD_FIGNORE_DETECT;
1108
1109         /*
1110          * Card status might have changed during the
1111          * blackout.
1112          */
1113         tasklet_schedule(&host->card_tasklet);
1114
1115         spin_unlock_bh(&host->lock);
1116 }
1117
1118 /*
1119  * Tasklets
1120  */
1121
1122 static inline struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1123 {
1124         WARN_ON(!host->mrq);
1125         if (!host->mrq)
1126                 return NULL;
1127
1128         WARN_ON(!host->mrq->cmd);
1129         if (!host->mrq->cmd)
1130                 return NULL;
1131
1132         WARN_ON(!host->mrq->cmd->data);
1133         if (!host->mrq->cmd->data)
1134                 return NULL;
1135
1136         return host->mrq->cmd->data;
1137 }
1138
1139 static void wbsd_tasklet_card(unsigned long param)
1140 {
1141         struct wbsd_host* host = (struct wbsd_host*)param;
1142         u8 csr;
1143         int delay = -1;
1144
1145         spin_lock(&host->lock);
1146
1147         if (host->flags & WBSD_FIGNORE_DETECT)
1148         {
1149                 spin_unlock(&host->lock);
1150                 return;
1151         }
1152
1153         csr = inb(host->base + WBSD_CSR);
1154         WARN_ON(csr == 0xff);
1155
1156         if (csr & WBSD_CARDPRESENT)
1157         {
1158                 if (!(host->flags & WBSD_FCARD_PRESENT))
1159                 {
1160                         DBG("Card inserted\n");
1161                         host->flags |= WBSD_FCARD_PRESENT;
1162
1163                         delay = 500;
1164                 }
1165         }
1166         else if (host->flags & WBSD_FCARD_PRESENT)
1167         {
1168                 DBG("Card removed\n");
1169                 host->flags &= ~WBSD_FCARD_PRESENT;
1170
1171                 if (host->mrq)
1172                 {
1173                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1174                                 mmc_hostname(host->mmc));
1175                         wbsd_reset(host);
1176
1177                         host->mrq->cmd->error = MMC_ERR_FAILED;
1178                         tasklet_schedule(&host->finish_tasklet);
1179                 }
1180
1181                 delay = 0;
1182         }
1183
1184         /*
1185          * Unlock first since we might get a call back.
1186          */
1187
1188         spin_unlock(&host->lock);
1189
1190         if (delay != -1)
1191                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1192 }
1193
1194 static void wbsd_tasklet_fifo(unsigned long param)
1195 {
1196         struct wbsd_host* host = (struct wbsd_host*)param;
1197         struct mmc_data* data;
1198
1199         spin_lock(&host->lock);
1200
1201         if (!host->mrq)
1202                 goto end;
1203
1204         data = wbsd_get_data(host);
1205         if (!data)
1206                 goto end;
1207
1208         if (data->flags & MMC_DATA_WRITE)
1209                 wbsd_fill_fifo(host);
1210         else
1211                 wbsd_empty_fifo(host);
1212
1213         /*
1214          * Done?
1215          */
1216         if (host->size == data->bytes_xfered)
1217         {
1218                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1219                 tasklet_schedule(&host->finish_tasklet);
1220         }
1221
1222 end:
1223         spin_unlock(&host->lock);
1224 }
1225
1226 static void wbsd_tasklet_crc(unsigned long param)
1227 {
1228         struct wbsd_host* host = (struct wbsd_host*)param;
1229         struct mmc_data* data;
1230
1231         spin_lock(&host->lock);
1232
1233         if (!host->mrq)
1234                 goto end;
1235
1236         data = wbsd_get_data(host);
1237         if (!data)
1238                 goto end;
1239
1240         DBGF("CRC error\n");
1241
1242         data->error = MMC_ERR_BADCRC;
1243
1244         tasklet_schedule(&host->finish_tasklet);
1245
1246 end:
1247         spin_unlock(&host->lock);
1248 }
1249
1250 static void wbsd_tasklet_timeout(unsigned long param)
1251 {
1252         struct wbsd_host* host = (struct wbsd_host*)param;
1253         struct mmc_data* data;
1254
1255         spin_lock(&host->lock);
1256
1257         if (!host->mrq)
1258                 goto end;
1259
1260         data = wbsd_get_data(host);
1261         if (!data)
1262                 goto end;
1263
1264         DBGF("Timeout\n");
1265
1266         data->error = MMC_ERR_TIMEOUT;
1267
1268         tasklet_schedule(&host->finish_tasklet);
1269
1270 end:
1271         spin_unlock(&host->lock);
1272 }
1273
1274 static void wbsd_tasklet_finish(unsigned long param)
1275 {
1276         struct wbsd_host* host = (struct wbsd_host*)param;
1277         struct mmc_data* data;
1278
1279         spin_lock(&host->lock);
1280
1281         WARN_ON(!host->mrq);
1282         if (!host->mrq)
1283                 goto end;
1284
1285         data = wbsd_get_data(host);
1286         if (!data)
1287                 goto end;
1288
1289         wbsd_finish_data(host, data);
1290
1291 end:
1292         spin_unlock(&host->lock);
1293 }
1294
1295 static void wbsd_tasklet_block(unsigned long param)
1296 {
1297         struct wbsd_host* host = (struct wbsd_host*)param;
1298         struct mmc_data* data;
1299
1300         spin_lock(&host->lock);
1301
1302         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1303                 WBSD_CRC_OK)
1304         {
1305                 data = wbsd_get_data(host);
1306                 if (!data)
1307                         goto end;
1308
1309                 DBGF("CRC error\n");
1310
1311                 data->error = MMC_ERR_BADCRC;
1312
1313                 tasklet_schedule(&host->finish_tasklet);
1314         }
1315
1316 end:
1317         spin_unlock(&host->lock);
1318 }
1319
1320 /*
1321  * Interrupt handling
1322  */
1323
1324 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1325 {
1326         struct wbsd_host* host = dev_id;
1327         int isr;
1328
1329         isr = inb(host->base + WBSD_ISR);
1330
1331         /*
1332          * Was it actually our hardware that caused the interrupt?
1333          */
1334         if (isr == 0xff || isr == 0x00)
1335                 return IRQ_NONE;
1336
1337         host->isr |= isr;
1338
1339         /*
1340          * Schedule tasklets as needed.
1341          */
1342         if (isr & WBSD_INT_CARD)
1343                 tasklet_schedule(&host->card_tasklet);
1344         if (isr & WBSD_INT_FIFO_THRE)
1345                 tasklet_schedule(&host->fifo_tasklet);
1346         if (isr & WBSD_INT_CRC)
1347                 tasklet_hi_schedule(&host->crc_tasklet);
1348         if (isr & WBSD_INT_TIMEOUT)
1349                 tasklet_hi_schedule(&host->timeout_tasklet);
1350         if (isr & WBSD_INT_BUSYEND)
1351                 tasklet_hi_schedule(&host->block_tasklet);
1352         if (isr & WBSD_INT_TC)
1353                 tasklet_schedule(&host->finish_tasklet);
1354
1355         return IRQ_HANDLED;
1356 }
1357
1358 /*****************************************************************************\
1359  *                                                                           *
1360  * Device initialisation and shutdown                                        *
1361  *                                                                           *
1362 \*****************************************************************************/
1363
1364 /*
1365  * Allocate/free MMC structure.
1366  */
1367
1368 static int __devinit wbsd_alloc_mmc(struct device* dev)
1369 {
1370         struct mmc_host* mmc;
1371         struct wbsd_host* host;
1372
1373         /*
1374          * Allocate MMC structure.
1375          */
1376         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1377         if (!mmc)
1378                 return -ENOMEM;
1379
1380         host = mmc_priv(mmc);
1381         host->mmc = mmc;
1382
1383         host->dma = -1;
1384
1385         /*
1386          * Set host parameters.
1387          */
1388         mmc->ops = &wbsd_ops;
1389         mmc->f_min = 375000;
1390         mmc->f_max = 24000000;
1391         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1392         mmc->caps = MMC_CAP_4_BIT_DATA;
1393
1394         spin_lock_init(&host->lock);
1395
1396         /*
1397          * Set up timers
1398          */
1399         init_timer(&host->ignore_timer);
1400         host->ignore_timer.data = (unsigned long)host;
1401         host->ignore_timer.function = wbsd_reset_ignore;
1402
1403         /*
1404          * Maximum number of segments. Worst case is one sector per segment
1405          * so this will be 64kB/512.
1406          */
1407         mmc->max_hw_segs = 128;
1408         mmc->max_phys_segs = 128;
1409
1410         /*
1411          * Maximum number of sectors in one transfer. Also limited by 64kB
1412          * buffer.
1413          */
1414         mmc->max_sectors = 128;
1415
1416         /*
1417          * Maximum segment size. Could be one segment with the maximum number
1418          * of segments.
1419          */
1420         mmc->max_seg_size = mmc->max_sectors * 512;
1421
1422         dev_set_drvdata(dev, mmc);
1423
1424         return 0;
1425 }
1426
1427 static void __devexit wbsd_free_mmc(struct device* dev)
1428 {
1429         struct mmc_host* mmc;
1430         struct wbsd_host* host;
1431
1432         mmc = dev_get_drvdata(dev);
1433         if (!mmc)
1434                 return;
1435
1436         host = mmc_priv(mmc);
1437         BUG_ON(host == NULL);
1438
1439         del_timer_sync(&host->ignore_timer);
1440
1441         mmc_free_host(mmc);
1442
1443         dev_set_drvdata(dev, NULL);
1444 }
1445
1446 /*
1447  * Scan for known chip id:s
1448  */
1449
1450 static int __devinit wbsd_scan(struct wbsd_host* host)
1451 {
1452         int i, j, k;
1453         int id;
1454
1455         /*
1456          * Iterate through all ports, all codes to
1457          * find hardware that is in our known list.
1458          */
1459         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1460         {
1461                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1462                         continue;
1463
1464                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1465                 {
1466                         id = 0xFFFF;
1467
1468                         host->config = config_ports[i];
1469                         host->unlock_code = unlock_codes[j];
1470
1471                         wbsd_unlock_config(host);
1472
1473                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1474                         id = inb(config_ports[i] + 1) << 8;
1475
1476                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1477                         id |= inb(config_ports[i] + 1);
1478
1479                         wbsd_lock_config(host);
1480
1481                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1482                         {
1483                                 if (id == valid_ids[k])
1484                                 {
1485                                         host->chip_id = id;
1486
1487                                         return 0;
1488                                 }
1489                         }
1490
1491                         if (id != 0xFFFF)
1492                         {
1493                                 DBG("Unknown hardware (id %x) found at %x\n",
1494                                         id, config_ports[i]);
1495                         }
1496                 }
1497
1498                 release_region(config_ports[i], 2);
1499         }
1500
1501         host->config = 0;
1502         host->unlock_code = 0;
1503
1504         return -ENODEV;
1505 }
1506
1507 /*
1508  * Allocate/free io port ranges
1509  */
1510
1511 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1512 {
1513         if (io & 0x7)
1514                 return -EINVAL;
1515
1516         if (!request_region(base, 8, DRIVER_NAME))
1517                 return -EIO;
1518
1519         host->base = io;
1520
1521         return 0;
1522 }
1523
1524 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1525 {
1526         if (host->base)
1527                 release_region(host->base, 8);
1528
1529         host->base = 0;
1530
1531         if (host->config)
1532                 release_region(host->config, 2);
1533
1534         host->config = 0;
1535 }
1536
1537 /*
1538  * Allocate/free DMA port and buffer
1539  */
1540
1541 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1542 {
1543         if (dma < 0)
1544                 return;
1545
1546         if (request_dma(dma, DRIVER_NAME))
1547                 goto err;
1548
1549         /*
1550          * We need to allocate a special buffer in
1551          * order for ISA to be able to DMA to it.
1552          */
1553         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1554                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1555         if (!host->dma_buffer)
1556                 goto free;
1557
1558         /*
1559          * Translate the address to a physical address.
1560          */
1561         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1562                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1563
1564         /*
1565          * ISA DMA must be aligned on a 64k basis.
1566          */
1567         if ((host->dma_addr & 0xffff) != 0)
1568                 goto kfree;
1569         /*
1570          * ISA cannot access memory above 16 MB.
1571          */
1572         else if (host->dma_addr >= 0x1000000)
1573                 goto kfree;
1574
1575         host->dma = dma;
1576
1577         return;
1578
1579 kfree:
1580         /*
1581          * If we've gotten here then there is some kind of alignment bug
1582          */
1583         BUG_ON(1);
1584
1585         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1586                 DMA_BIDIRECTIONAL);
1587         host->dma_addr = (dma_addr_t)NULL;
1588
1589         kfree(host->dma_buffer);
1590         host->dma_buffer = NULL;
1591
1592 free:
1593         free_dma(dma);
1594
1595 err:
1596         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1597                 "Falling back on FIFO.\n", dma);
1598 }
1599
1600 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1601 {
1602         if (host->dma_addr)
1603                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1604                         DMA_BIDIRECTIONAL);
1605         kfree(host->dma_buffer);
1606         if (host->dma >= 0)
1607                 free_dma(host->dma);
1608
1609         host->dma = -1;
1610         host->dma_buffer = NULL;
1611         host->dma_addr = (dma_addr_t)NULL;
1612 }
1613
1614 /*
1615  * Allocate/free IRQ.
1616  */
1617
1618 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1619 {
1620         int ret;
1621
1622         /*
1623          * Allocate interrupt.
1624          */
1625
1626         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1627         if (ret)
1628                 return ret;
1629
1630         host->irq = irq;
1631
1632         /*
1633          * Set up tasklets.
1634          */
1635         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1636         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1637         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1638         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1639         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1640         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1641
1642         return 0;
1643 }
1644
1645 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1646 {
1647         if (!host->irq)
1648                 return;
1649
1650         free_irq(host->irq, host);
1651
1652         host->irq = 0;
1653
1654         tasklet_kill(&host->card_tasklet);
1655         tasklet_kill(&host->fifo_tasklet);
1656         tasklet_kill(&host->crc_tasklet);
1657         tasklet_kill(&host->timeout_tasklet);
1658         tasklet_kill(&host->finish_tasklet);
1659         tasklet_kill(&host->block_tasklet);
1660 }
1661
1662 /*
1663  * Allocate all resources for the host.
1664  */
1665
1666 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1667         int base, int irq, int dma)
1668 {
1669         int ret;
1670
1671         /*
1672          * Allocate I/O ports.
1673          */
1674         ret = wbsd_request_region(host, base);
1675         if (ret)
1676                 return ret;
1677
1678         /*
1679          * Allocate interrupt.
1680          */
1681         ret = wbsd_request_irq(host, irq);
1682         if (ret)
1683                 return ret;
1684
1685         /*
1686          * Allocate DMA.
1687          */
1688         wbsd_request_dma(host, dma);
1689
1690         return 0;
1691 }
1692
1693 /*
1694  * Release all resources for the host.
1695  */
1696
1697 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1698 {
1699         wbsd_release_dma(host);
1700         wbsd_release_irq(host);
1701         wbsd_release_regions(host);
1702 }
1703
1704 /*
1705  * Configure the resources the chip should use.
1706  */
1707
1708 static void wbsd_chip_config(struct wbsd_host* host)
1709 {
1710         wbsd_unlock_config(host);
1711
1712         /*
1713          * Reset the chip.
1714          */
1715         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1716         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1717
1718         /*
1719          * Select SD/MMC function.
1720          */
1721         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1722
1723         /*
1724          * Set up card detection.
1725          */
1726         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1727
1728         /*
1729          * Configure chip
1730          */
1731         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1732         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1733
1734         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1735
1736         if (host->dma >= 0)
1737                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1738
1739         /*
1740          * Enable and power up chip.
1741          */
1742         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1743         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1744
1745         wbsd_lock_config(host);
1746 }
1747
1748 /*
1749  * Check that configured resources are correct.
1750  */
1751
1752 static int wbsd_chip_validate(struct wbsd_host* host)
1753 {
1754         int base, irq, dma;
1755
1756         wbsd_unlock_config(host);
1757
1758         /*
1759          * Select SD/MMC function.
1760          */
1761         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1762
1763         /*
1764          * Read configuration.
1765          */
1766         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1767         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1768
1769         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1770
1771         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1772
1773         wbsd_lock_config(host);
1774
1775         /*
1776          * Validate against given configuration.
1777          */
1778         if (base != host->base)
1779                 return 0;
1780         if (irq != host->irq)
1781                 return 0;
1782         if ((dma != host->dma) && (host->dma != -1))
1783                 return 0;
1784
1785         return 1;
1786 }
1787
1788 /*
1789  * Powers down the SD function
1790  */
1791
1792 static void wbsd_chip_poweroff(struct wbsd_host* host)
1793 {
1794         wbsd_unlock_config(host);
1795
1796         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1797         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1798
1799         wbsd_lock_config(host);
1800 }
1801
1802 /*****************************************************************************\
1803  *                                                                           *
1804  * Devices setup and shutdown                                                *
1805  *                                                                           *
1806 \*****************************************************************************/
1807
1808 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1809         int pnp)
1810 {
1811         struct wbsd_host* host = NULL;
1812         struct mmc_host* mmc = NULL;
1813         int ret;
1814
1815         ret = wbsd_alloc_mmc(dev);
1816         if (ret)
1817                 return ret;
1818
1819         mmc = dev_get_drvdata(dev);
1820         host = mmc_priv(mmc);
1821
1822         /*
1823          * Scan for hardware.
1824          */
1825         ret = wbsd_scan(host);
1826         if (ret)
1827         {
1828                 if (pnp && (ret == -ENODEV))
1829                 {
1830                         printk(KERN_WARNING DRIVER_NAME
1831                                 ": Unable to confirm device presence. You may "
1832                                 "experience lock-ups.\n");
1833                 }
1834                 else
1835                 {
1836                         wbsd_free_mmc(dev);
1837                         return ret;
1838                 }
1839         }
1840
1841         /*
1842          * Request resources.
1843          */
1844         ret = wbsd_request_resources(host, io, irq, dma);
1845         if (ret)
1846         {
1847                 wbsd_release_resources(host);
1848                 wbsd_free_mmc(dev);
1849                 return ret;
1850         }
1851
1852         /*
1853          * See if chip needs to be configured.
1854          */
1855         if (pnp)
1856         {
1857                 if ((host->config != 0) && !wbsd_chip_validate(host))
1858                 {
1859                         printk(KERN_WARNING DRIVER_NAME
1860                                 ": PnP active but chip not configured! "
1861                                 "You probably have a buggy BIOS. "
1862                                 "Configuring chip manually.\n");
1863                         wbsd_chip_config(host);
1864                 }
1865         }
1866         else
1867                 wbsd_chip_config(host);
1868
1869         /*
1870          * Power Management stuff. No idea how this works.
1871          * Not tested.
1872          */
1873 #ifdef CONFIG_PM
1874         if (host->config)
1875         {
1876                 wbsd_unlock_config(host);
1877                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1878                 wbsd_lock_config(host);
1879         }
1880 #endif
1881         /*
1882          * Allow device to initialise itself properly.
1883          */
1884         mdelay(5);
1885
1886         /*
1887          * Reset the chip into a known state.
1888          */
1889         wbsd_init_device(host);
1890
1891         mmc_add_host(mmc);
1892
1893         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1894         if (host->chip_id != 0)
1895                 printk(" id %x", (int)host->chip_id);
1896         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1897         if (host->dma >= 0)
1898                 printk(" dma %d", (int)host->dma);
1899         else
1900                 printk(" FIFO");
1901         if (pnp)
1902                 printk(" PnP");
1903         printk("\n");
1904
1905         return 0;
1906 }
1907
1908 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1909 {
1910         struct mmc_host* mmc = dev_get_drvdata(dev);
1911         struct wbsd_host* host;
1912
1913         if (!mmc)
1914                 return;
1915
1916         host = mmc_priv(mmc);
1917
1918         mmc_remove_host(mmc);
1919
1920         /*
1921          * Power down the SD/MMC function.
1922          */
1923         if (!pnp)
1924                 wbsd_chip_poweroff(host);
1925
1926         wbsd_release_resources(host);
1927
1928         wbsd_free_mmc(dev);
1929 }
1930
1931 /*
1932  * Non-PnP
1933  */
1934
1935 static int __devinit wbsd_probe(struct device* dev)
1936 {
1937         return wbsd_init(dev, io, irq, dma, 0);
1938 }
1939
1940 static int __devexit wbsd_remove(struct device* dev)
1941 {
1942         wbsd_shutdown(dev, 0);
1943
1944         return 0;
1945 }
1946
1947 /*
1948  * PnP
1949  */
1950
1951 #ifdef CONFIG_PNP
1952
1953 static int __devinit
1954 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1955 {
1956         int io, irq, dma;
1957
1958         /*
1959          * Get resources from PnP layer.
1960          */
1961         io = pnp_port_start(pnpdev, 0);
1962         irq = pnp_irq(pnpdev, 0);
1963         if (pnp_dma_valid(pnpdev, 0))
1964                 dma = pnp_dma(pnpdev, 0);
1965         else
1966                 dma = -1;
1967
1968         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1969
1970         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1971 }
1972
1973 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1974 {
1975         wbsd_shutdown(&dev->dev, 1);
1976 }
1977
1978 #endif /* CONFIG_PNP */
1979
1980 /*
1981  * Power management
1982  */
1983
1984 #ifdef CONFIG_PM
1985
1986 static int wbsd_suspend(struct device *dev, pm_message_t state)
1987 {
1988         struct mmc_host *mmc = dev_get_drvdata(dev);
1989         struct wbsd_host *host;
1990         int ret;
1991
1992         if (!mmc)
1993                 return 0;
1994
1995         DBG("Suspending...\n");
1996
1997         ret = mmc_suspend_host(mmc, state);
1998         if (!ret)
1999                 return ret;
2000
2001         host = mmc_priv(mmc);
2002
2003         wbsd_chip_poweroff(host);
2004
2005         return 0;
2006 }
2007
2008 static int wbsd_resume(struct device *dev)
2009 {
2010         struct mmc_host *mmc = dev_get_drvdata(dev);
2011         struct wbsd_host *host;
2012
2013         if (!mmc)
2014                 return 0;
2015
2016         DBG("Resuming...\n");
2017
2018         host = mmc_priv(mmc);
2019
2020         wbsd_chip_config(host);
2021
2022         /*
2023          * Allow device to initialise itself properly.
2024          */
2025         mdelay(5);
2026
2027         wbsd_init_device(host);
2028
2029         return mmc_resume_host(mmc);
2030 }
2031
2032 #else /* CONFIG_PM */
2033
2034 #define wbsd_suspend NULL
2035 #define wbsd_resume NULL
2036
2037 #endif /* CONFIG_PM */
2038
2039 static struct platform_device *wbsd_device;
2040
2041 static struct device_driver wbsd_driver = {
2042         .name           = DRIVER_NAME,
2043         .bus            = &platform_bus_type,
2044         .probe          = wbsd_probe,
2045         .remove         = wbsd_remove,
2046
2047         .suspend        = wbsd_suspend,
2048         .resume         = wbsd_resume,
2049 };
2050
2051 #ifdef CONFIG_PNP
2052
2053 static struct pnp_driver wbsd_pnp_driver = {
2054         .name           = DRIVER_NAME,
2055         .id_table       = pnp_dev_table,
2056         .probe          = wbsd_pnp_probe,
2057         .remove         = wbsd_pnp_remove,
2058 };
2059
2060 #endif /* CONFIG_PNP */
2061
2062 /*
2063  * Module loading/unloading
2064  */
2065
2066 static int __init wbsd_drv_init(void)
2067 {
2068         int result;
2069
2070         printk(KERN_INFO DRIVER_NAME
2071                 ": Winbond W83L51xD SD/MMC card interface driver, "
2072                 DRIVER_VERSION "\n");
2073         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2074
2075 #ifdef CONFIG_PNP
2076
2077         if (!nopnp)
2078         {
2079                 result = pnp_register_driver(&wbsd_pnp_driver);
2080                 if (result < 0)
2081                         return result;
2082         }
2083
2084 #endif /* CONFIG_PNP */
2085
2086         if (nopnp)
2087         {
2088                 result = driver_register(&wbsd_driver);
2089                 if (result < 0)
2090                         return result;
2091
2092                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
2093                         NULL, 0);
2094                 if (IS_ERR(wbsd_device))
2095                         return PTR_ERR(wbsd_device);
2096         }
2097
2098         return 0;
2099 }
2100
2101 static void __exit wbsd_drv_exit(void)
2102 {
2103 #ifdef CONFIG_PNP
2104
2105         if (!nopnp)
2106                 pnp_unregister_driver(&wbsd_pnp_driver);
2107
2108 #endif /* CONFIG_PNP */
2109
2110         if (nopnp)
2111         {
2112                 platform_device_unregister(wbsd_device);
2113
2114                 driver_unregister(&wbsd_driver);
2115         }
2116
2117         DBG("unloaded\n");
2118 }
2119
2120 module_init(wbsd_drv_init);
2121 module_exit(wbsd_drv_exit);
2122 #ifdef CONFIG_PNP
2123 module_param(nopnp, uint, 0444);
2124 #endif
2125 module_param(io, uint, 0444);
2126 module_param(irq, uint, 0444);
2127 module_param(dma, int, 0444);
2128
2129 MODULE_LICENSE("GPL");
2130 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2131 MODULE_VERSION(DRIVER_VERSION);
2132
2133 #ifdef CONFIG_PNP
2134 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2135 #endif
2136 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2137 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2138 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");