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 #ifdef CONFIG_MMC_DEBUG
  58 void DBG_REG(int reg, u8 value)
  59 {
  60         int i;
  61
  62         printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ",
  63                 reg, (int)value, (int)value, (value < 0x20)?'.':value);
  64
  65         for (i = 7;i >= 0;i--)
  66         {
  67                 if (value & (1 << i))
  68                         printk("x");
  69                 else
  70                         printk(".");
  71         }
  72
  73         printk("\n");
  74 }
  75 #else
  76 #define DBG_REG(r, v) do {}  while (0)
  77 #endif
  78
  79 /*
  80  * Device resources
  81  */
  82
  83 #ifdef CONFIG_PNP
  84
  85 static const struct pnp_device_id pnp_dev_table[] = {
  86         { "WEC0517", 0 },
  87         { "WEC0518", 0 },
  88         { "", 0 },
  89 };
  90
  91 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
  92
  93 #endif /* CONFIG_PNP */
  94
  95 #ifdef CONFIG_PNP
  96 static unsigned int nopnp = 0;
  97 #else
  98 static const unsigned int nopnp = 1;
  99 #endif
 100 static unsigned int io = 0x248;
 101 static unsigned int irq = 6;
 102 static int dma = 2;
 103
 104 /*
 105  * Basic functions
 106  */
 107
 108 static inline void wbsd_unlock_config(struct wbsd_host* host)
 109 {
 110         BUG_ON(host->config == 0);
 111
 112         outb(host->unlock_code, host->config);
 113         outb(host->unlock_code, host->config);
 114 }
 115
 116 static inline void wbsd_lock_config(struct wbsd_host* host)
 117 {
 118         BUG_ON(host->config == 0);
 119
 120         outb(LOCK_CODE, host->config);
 121 }
 122
 123 static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value)
 124 {
 125         BUG_ON(host->config == 0);
 126
 127         outb(reg, host->config);
 128         outb(value, host->config + 1);
 129 }
 130
 131 static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg)
 132 {
 133         BUG_ON(host->config == 0);
 134
 135         outb(reg, host->config);
 136         return inb(host->config + 1);
 137 }
 138
 139 static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value)
 140 {
 141         outb(index, host->base + WBSD_IDXR);
 142         outb(value, host->base + WBSD_DATAR);
 143 }
 144
 145 static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index)
 146 {
 147         outb(index, host->base + WBSD_IDXR);
 148         return inb(host->base + WBSD_DATAR);
 149 }
 150
 151 /*
 152  * Common routines
 153  */
 154
 155 static void wbsd_init_device(struct wbsd_host* host)
 156 {
 157         u8 setup, ier;
 158
 159         /*
 160          * Reset chip (SD/MMC part) and fifo.
 161          */
 162         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 163         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
 164         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 165
 166         /*
 167          * Set DAT3 to input
 168          */
 169         setup &= ~WBSD_DAT3_H;
 170         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 171         host->flags &= ~WBSD_FIGNORE_DETECT;
 172
 173         /*
 174          * Read back default clock.
 175          */
 176         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
 177
 178         /*
 179          * Power down port.
 180          */
 181         outb(WBSD_POWER_N, host->base + WBSD_CSR);
 182
 183         /*
 184          * Set maximum timeout.
 185          */
 186         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
 187
 188         /*
 189          * Test for card presence
 190          */
 191         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
 192                 host->flags |= WBSD_FCARD_PRESENT;
 193         else
 194                 host->flags &= ~WBSD_FCARD_PRESENT;
 195
 196         /*
 197          * Enable interesting interrupts.
 198          */
 199         ier = 0;
 200         ier |= WBSD_EINT_CARD;
 201         ier |= WBSD_EINT_FIFO_THRE;
 202         ier |= WBSD_EINT_CCRC;
 203         ier |= WBSD_EINT_TIMEOUT;
 204         ier |= WBSD_EINT_CRC;
 205         ier |= WBSD_EINT_TC;
 206
 207         outb(ier, host->base + WBSD_EIR);
 208
 209         /*
 210          * Clear interrupts.
 211          */
 212         inb(host->base + WBSD_ISR);
 213 }
 214
 215 static void wbsd_reset(struct wbsd_host* host)
 216 {
 217         u8 setup;
 218
 219         printk(KERN_ERR DRIVER_NAME ": Resetting chip\n");
 220
 221         /*
 222          * Soft reset of chip (SD/MMC part).
 223          */
 224         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 225         setup |= WBSD_SOFT_RESET;
 226         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 227 }
 228
 229 static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq)
 230 {
 231         unsigned long dmaflags;
 232
 233         DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
 234
 235         if (host->dma >= 0)
 236         {
 237                 /*
 238                  * Release ISA DMA controller.
 239                  */
 240                 dmaflags = claim_dma_lock();
 241                 disable_dma(host->dma);
 242                 clear_dma_ff(host->dma);
 243                 release_dma_lock(dmaflags);
 244
 245                 /*
 246                  * Disable DMA on host.
 247                  */
 248                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 249         }
 250
 251         host->mrq = NULL;
 252
 253         /*
 254          * MMC layer might call back into the driver so first unlock.
 255          */
 256         spin_unlock(&host->lock);
 257         mmc_request_done(host->mmc, mrq);
 258         spin_lock(&host->lock);
 259 }
 260
 261 /*
 262  * Scatter/gather functions
 263  */
 264
 265 static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data)
 266 {
 267         /*
 268          * Get info. about SG list from data structure.
 269          */
 270         host->cur_sg = data->sg;
 271         host->num_sg = data->sg_len;
 272
 273         host->offset = 0;
 274         host->remain = host->cur_sg->length;
 275 }
 276
 277 static inline int wbsd_next_sg(struct wbsd_host* host)
 278 {
 279         /*
 280          * Skip to next SG entry.
 281          */
 282         host->cur_sg++;
 283         host->num_sg--;
 284
 285         /*
 286          * Any entries left?
 287          */
 288         if (host->num_sg > 0)
 289           {
 290             host->offset = 0;
 291             host->remain = host->cur_sg->length;
 292           }
 293
 294         return host->num_sg;
 295 }
 296
 297 static inline char* wbsd_kmap_sg(struct wbsd_host* host)
 298 {
 299         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
 300                 host->cur_sg->offset;
 301         return host->mapped_sg;
 302 }
 303
 304 static inline void wbsd_kunmap_sg(struct wbsd_host* host)
 305 {
 306         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
 307 }
 308
 309 static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data)
 310 {
 311         unsigned int len, i, size;
 312         struct scatterlist* sg;
 313         char* dmabuf = host->dma_buffer;
 314         char* sgbuf;
 315
 316         size = host->size;
 317
 318         sg = data->sg;
 319         len = data->sg_len;
 320
 321         /*
 322          * Just loop through all entries. Size might not
 323          * be the entire list though so make sure that
 324          * we do not transfer too much.
 325          */
 326         for (i = 0;i < len;i++)
 327         {
 328                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
 329                 if (size < sg[i].length)
 330                         memcpy(dmabuf, sgbuf, size);
 331                 else
 332                         memcpy(dmabuf, sgbuf, sg[i].length);
 333                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
 334                 dmabuf += sg[i].length;
 335
 336                 if (size < sg[i].length)
 337                         size = 0;
 338                 else
 339                         size -= sg[i].length;
 340
 341                 if (size == 0)
 342                         break;
 343         }
 344
 345         /*
 346          * Check that we didn't get a request to transfer
 347          * more data than can fit into the SG list.
 348          */
 349
 350         BUG_ON(size != 0);
 351
 352         host->size -= size;
 353 }
 354
 355 static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data)
 356 {
 357         unsigned int len, i, size;
 358         struct scatterlist* sg;
 359         char* dmabuf = host->dma_buffer;
 360         char* sgbuf;
 361
 362         size = host->size;
 363
 364         sg = data->sg;
 365         len = data->sg_len;
 366
 367         /*
 368          * Just loop through all entries. Size might not
 369          * be the entire list though so make sure that
 370          * we do not transfer too much.
 371          */
 372         for (i = 0;i < len;i++)
 373         {
 374                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
 375                 if (size < sg[i].length)
 376                         memcpy(sgbuf, dmabuf, size);
 377                 else
 378                         memcpy(sgbuf, dmabuf, sg[i].length);
 379                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
 380                 dmabuf += sg[i].length;
 381
 382                 if (size < sg[i].length)
 383                         size = 0;
 384                 else
 385                         size -= sg[i].length;
 386
 387                 if (size == 0)
 388                         break;
 389         }
 390
 391         /*
 392          * Check that we didn't get a request to transfer
 393          * more data than can fit into the SG list.
 394          */
 395
 396         BUG_ON(size != 0);
 397
 398         host->size -= size;
 399 }
 400
 401 /*
 402  * Command handling
 403  */
 404
 405 static inline void wbsd_get_short_reply(struct wbsd_host* host,
 406         struct mmc_command* cmd)
 407 {
 408         /*
 409          * Correct response type?
 410          */
 411         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT)
 412         {
 413                 cmd->error = MMC_ERR_INVALID;
 414                 return;
 415         }
 416
 417         cmd->resp[0] =
 418                 wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
 419         cmd->resp[0] |=
 420                 wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
 421         cmd->resp[0] |=
 422                 wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
 423         cmd->resp[0] |=
 424                 wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
 425         cmd->resp[1] =
 426                 wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
 427 }
 428
 429 static inline void wbsd_get_long_reply(struct wbsd_host* host,
 430         struct mmc_command* cmd)
 431 {
 432         int i;
 433
 434         /*
 435          * Correct response type?
 436          */
 437         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG)
 438         {
 439                 cmd->error = MMC_ERR_INVALID;
 440                 return;
 441         }
 442
 443         for (i = 0;i < 4;i++)
 444         {
 445                 cmd->resp[i] =
 446                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
 447                 cmd->resp[i] |=
 448                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
 449                 cmd->resp[i] |=
 450                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
 451                 cmd->resp[i] |=
 452                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
 453         }
 454 }
 455
 456 static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd)
 457 {
 458         int i;
 459         u8 status, isr;
 460
 461         DBGF("Sending cmd (%x)\n", cmd->opcode);
 462
 463         /*
 464          * Clear accumulated ISR. The interrupt routine
 465          * will fill this one with events that occur during
 466          * transfer.
 467          */
 468         host->isr = 0;
 469
 470         /*
 471          * Send the command (CRC calculated by host).
 472          */
 473         outb(cmd->opcode, host->base + WBSD_CMDR);
 474         for (i = 3;i >= 0;i--)
 475                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
 476
 477         cmd->error = MMC_ERR_NONE;
 478
 479         /*
 480          * Wait for the request to complete.
 481          */
 482         do {
 483                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 484         } while (status & WBSD_CARDTRAFFIC);
 485
 486         /*
 487          * Do we expect a reply?
 488          */
 489         if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE)
 490         {
 491                 /*
 492                  * Read back status.
 493                  */
 494                 isr = host->isr;
 495
 496                 /* Card removed? */
 497                 if (isr & WBSD_INT_CARD)
 498                         cmd->error = MMC_ERR_TIMEOUT;
 499                 /* Timeout? */
 500                 else if (isr & WBSD_INT_TIMEOUT)
 501                         cmd->error = MMC_ERR_TIMEOUT;
 502                 /* CRC? */
 503                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 504                         cmd->error = MMC_ERR_BADCRC;
 505                 /* All ok */
 506                 else
 507                 {
 508                         if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT)
 509                                 wbsd_get_short_reply(host, cmd);
 510                         else
 511                                 wbsd_get_long_reply(host, cmd);
 512                 }
 513         }
 514
 515         DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
 516 }
 517
 518 /*
 519  * Data functions
 520  */
 521
 522 static void wbsd_empty_fifo(struct wbsd_host* host)
 523 {
 524         struct mmc_data* data = host->mrq->cmd->data;
 525         char* buffer;
 526         int i, fsr, fifo;
 527
 528         /*
 529          * Handle excessive data.
 530          */
 531         if (data->bytes_xfered == host->size)
 532                 return;
 533
 534         buffer = wbsd_kmap_sg(host) + host->offset;
 535
 536         /*
 537          * Drain the fifo. This has a tendency to loop longer
 538          * than the FIFO length (usually one block).
 539          */
 540         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY))
 541         {
 542                 /*
 543                  * The size field in the FSR is broken so we have to
 544                  * do some guessing.
 545                  */
 546                 if (fsr & WBSD_FIFO_FULL)
 547                         fifo = 16;
 548                 else if (fsr & WBSD_FIFO_FUTHRE)
 549                         fifo = 8;
 550                 else
 551                         fifo = 1;
 552
 553                 for (i = 0;i < fifo;i++)
 554                 {
 555                         *buffer = inb(host->base + WBSD_DFR);
 556                         buffer++;
 557                         host->offset++;
 558                         host->remain--;
 559
 560                         data->bytes_xfered++;
 561
 562                         /*
 563                          * Transfer done?
 564                          */
 565                         if (data->bytes_xfered == host->size)
 566                         {
 567                                 wbsd_kunmap_sg(host);
 568                                 return;
 569                         }
 570
 571                         /*
 572                          * End of scatter list entry?
 573                          */
 574                         if (host->remain == 0)
 575                         {
 576                                 wbsd_kunmap_sg(host);
 577
 578                                 /*
 579                                  * Get next entry. Check if last.
 580                                  */
 581                                 if (!wbsd_next_sg(host))
 582                                 {
 583                                         /*
 584                                          * We should never reach this point.
 585                                          * It means that we're trying to
 586                                          * transfer more blocks than can fit
 587                                          * into the scatter list.
 588                                          */
 589                                         BUG_ON(1);
 590
 591                                         host->size = data->bytes_xfered;
 592
 593                                         return;
 594                                 }
 595
 596                                 buffer = wbsd_kmap_sg(host);
 597                         }
 598                 }
 599         }
 600
 601         wbsd_kunmap_sg(host);
 602
 603         /*
 604          * This is a very dirty hack to solve a
 605          * hardware problem. The chip doesn't trigger
 606          * FIFO threshold interrupts properly.
 607          */
 608         if ((host->size - data->bytes_xfered) < 16)
 609                 tasklet_schedule(&host->fifo_tasklet);
 610 }
 611
 612 static void wbsd_fill_fifo(struct wbsd_host* host)
 613 {
 614         struct mmc_data* data = host->mrq->cmd->data;
 615         char* buffer;
 616         int i, fsr, fifo;
 617
 618         /*
 619          * Check that we aren't being called after the
 620          * entire buffer has been transfered.
 621          */
 622         if (data->bytes_xfered == host->size)
 623                 return;
 624
 625         buffer = wbsd_kmap_sg(host) + host->offset;
 626
 627         /*
 628          * Fill the fifo. This has a tendency to loop longer
 629          * than the FIFO length (usually one block).
 630          */
 631         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL))
 632         {
 633                 /*
 634                  * The size field in the FSR is broken so we have to
 635                  * do some guessing.
 636                  */
 637                 if (fsr & WBSD_FIFO_EMPTY)
 638                         fifo = 0;
 639                 else if (fsr & WBSD_FIFO_EMTHRE)
 640                         fifo = 8;
 641                 else
 642                         fifo = 15;
 643
 644                 for (i = 16;i > fifo;i--)
 645                 {
 646                         outb(*buffer, host->base + WBSD_DFR);
 647                         buffer++;
 648                         host->offset++;
 649                         host->remain--;
 650
 651                         data->bytes_xfered++;
 652
 653                         /*
 654                          * Transfer done?
 655                          */
 656                         if (data->bytes_xfered == host->size)
 657                         {
 658                                 wbsd_kunmap_sg(host);
 659                                 return;
 660                         }
 661
 662                         /*
 663                          * End of scatter list entry?
 664                          */
 665                         if (host->remain == 0)
 666                         {
 667                                 wbsd_kunmap_sg(host);
 668
 669                                 /*
 670                                  * Get next entry. Check if last.
 671                                  */
 672                                 if (!wbsd_next_sg(host))
 673                                 {
 674                                         /*
 675                                          * We should never reach this point.
 676                                          * It means that we're trying to
 677                                          * transfer more blocks than can fit
 678                                          * into the scatter list.
 679                                          */
 680                                         BUG_ON(1);
 681
 682                                         host->size = data->bytes_xfered;
 683
 684                                         return;
 685                                 }
 686
 687                                 buffer = wbsd_kmap_sg(host);
 688                         }
 689                 }
 690         }
 691
 692         wbsd_kunmap_sg(host);
 693
 694         /*
 695          * The controller stops sending interrupts for
 696          * 'FIFO empty' under certain conditions. So we
 697          * need to be a bit more pro-active.
 698          */
 699         tasklet_schedule(&host->fifo_tasklet);
 700 }
 701
 702 static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
 703 {
 704         u16 blksize;
 705         u8 setup;
 706         unsigned long dmaflags;
 707
 708         DBGF("blksz %04x blks %04x flags %08x\n",
 709                 1 << data->blksz_bits, data->blocks, data->flags);
 710         DBGF("tsac %d ms nsac %d clk\n",
 711                 data->timeout_ns / 1000000, data->timeout_clks);
 712
 713         /*
 714          * Calculate size.
 715          */
 716         host->size = data->blocks << data->blksz_bits;
 717
 718         /*
 719          * Check timeout values for overflow.
 720          * (Yes, some cards cause this value to overflow).
 721          */
 722         if (data->timeout_ns > 127000000)
 723                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
 724         else
 725                 wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000);
 726
 727         if (data->timeout_clks > 255)
 728                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
 729         else
 730                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
 731
 732         /*
 733          * Inform the chip of how large blocks will be
 734          * sent. It needs this to determine when to
 735          * calculate CRC.
 736          *
 737          * Space for CRC must be included in the size.
 738          */
 739         blksize = (1 << data->blksz_bits) + 2;
 740
 741         wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 742         wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 743
 744         /*
 745          * Clear the FIFO. This is needed even for DMA
 746          * transfers since the chip still uses the FIFO
 747          * internally.
 748          */
 749         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 750         setup |= WBSD_FIFO_RESET;
 751         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 752
 753         /*
 754          * DMA transfer?
 755          */
 756         if (host->dma >= 0)
 757         {
 758                 /*
 759                  * The buffer for DMA is only 64 kB.
 760                  */
 761                 BUG_ON(host->size > 0x10000);
 762                 if (host->size > 0x10000)
 763                 {
 764                         data->error = MMC_ERR_INVALID;
 765                         return;
 766                 }
 767
 768                 /*
 769                  * Transfer data from the SG list to
 770                  * the DMA buffer.
 771                  */
 772                 if (data->flags & MMC_DATA_WRITE)
 773                         wbsd_sg_to_dma(host, data);
 774
 775                 /*
 776                  * Initialise the ISA DMA controller.
 777                  */
 778                 dmaflags = claim_dma_lock();
 779                 disable_dma(host->dma);
 780                 clear_dma_ff(host->dma);
 781                 if (data->flags & MMC_DATA_READ)
 782                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 783                 else
 784                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 785                 set_dma_addr(host->dma, host->dma_addr);
 786                 set_dma_count(host->dma, host->size);
 787
 788                 enable_dma(host->dma);
 789                 release_dma_lock(dmaflags);
 790
 791                 /*
 792                  * Enable DMA on the host.
 793                  */
 794                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 795         }
 796         else
 797         {
 798                 /*
 799                  * This flag is used to keep printk
 800                  * output to a minimum.
 801                  */
 802                 host->firsterr = 1;
 803
 804                 /*
 805                  * Initialise the SG list.
 806                  */
 807                 wbsd_init_sg(host, data);
 808
 809                 /*
 810                  * Turn off DMA.
 811                  */
 812                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 813
 814                 /*
 815                  * Set up FIFO threshold levels (and fill
 816                  * buffer if doing a write).
 817                  */
 818                 if (data->flags & MMC_DATA_READ)
 819                 {
 820                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 821                                 WBSD_FIFOEN_FULL | 8);
 822                 }
 823                 else
 824                 {
 825                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 826                                 WBSD_FIFOEN_EMPTY | 8);
 827                         wbsd_fill_fifo(host);
 828                 }
 829         }
 830
 831         data->error = MMC_ERR_NONE;
 832 }
 833
 834 static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
 835 {
 836         unsigned long dmaflags;
 837         int count;
 838         u8 status;
 839
 840         WARN_ON(host->mrq == NULL);
 841
 842         /*
 843          * Send a stop command if needed.
 844          */
 845         if (data->stop)
 846                 wbsd_send_command(host, data->stop);
 847
 848         /*
 849          * Wait for the controller to leave data
 850          * transfer state.
 851          */
 852         do
 853         {
 854                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 855         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 856
 857         /*
 858          * DMA transfer?
 859          */
 860         if (host->dma >= 0)
 861         {
 862                 /*
 863                  * Disable DMA on the host.
 864                  */
 865                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 866
 867                 /*
 868                  * Turn of ISA DMA controller.
 869                  */
 870                 dmaflags = claim_dma_lock();
 871                 disable_dma(host->dma);
 872                 clear_dma_ff(host->dma);
 873                 count = get_dma_residue(host->dma);
 874                 release_dma_lock(dmaflags);
 875
 876                 /*
 877                  * Any leftover data?
 878                  */
 879                 if (count)
 880                 {
 881                         printk(KERN_ERR DRIVER_NAME ": Incomplete DMA "
 882                                 "transfer. %d bytes left.\n", count);
 883
 884                         data->error = MMC_ERR_FAILED;
 885                 }
 886                 else
 887                 {
 888                         /*
 889                          * Transfer data from DMA buffer to
 890                          * SG list.
 891                          */
 892                         if (data->flags & MMC_DATA_READ)
 893                                 wbsd_dma_to_sg(host, data);
 894
 895                         data->bytes_xfered = host->size;
 896                 }
 897         }
 898
 899         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 900
 901         wbsd_request_end(host, host->mrq);
 902 }
 903
 904 /*****************************************************************************\
 905  *                                                                           *
 906  * MMC layer callbacks                                                       *
 907  *                                                                           *
 908 \*****************************************************************************/
 909
 910 static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
 911 {
 912         struct wbsd_host* host = mmc_priv(mmc);
 913         struct mmc_command* cmd;
 914
 915         /*
 916          * Disable tasklets to avoid a deadlock.
 917          */
 918         spin_lock_bh(&host->lock);
 919
 920         BUG_ON(host->mrq != NULL);
 921
 922         cmd = mrq->cmd;
 923
 924         host->mrq = mrq;
 925
 926         /*
 927          * If there is no card in the slot then
 928          * timeout immediatly.
 929          */
 930         if (!(host->flags & WBSD_FCARD_PRESENT))
 931         {
 932                 cmd->error = MMC_ERR_TIMEOUT;
 933                 goto done;
 934         }
 935
 936         /*
 937          * Does the request include data?
 938          */
 939         if (cmd->data)
 940         {
 941                 wbsd_prepare_data(host, cmd->data);
 942
 943                 if (cmd->data->error != MMC_ERR_NONE)
 944                         goto done;
 945         }
 946
 947         wbsd_send_command(host, cmd);
 948
 949         /*
 950          * If this is a data transfer the request
 951          * will be finished after the data has
 952          * transfered.
 953          */
 954         if (cmd->data && (cmd->error == MMC_ERR_NONE))
 955         {
 956                 /*
 957                  * Dirty fix for hardware bug.
 958                  */
 959                 if (host->dma == -1)
 960                         tasklet_schedule(&host->fifo_tasklet);
 961
 962                 spin_unlock_bh(&host->lock);
 963
 964                 return;
 965         }
 966
 967 done:
 968         wbsd_request_end(host, mrq);
 969
 970         spin_unlock_bh(&host->lock);
 971 }
 972
 973 static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 974 {
 975         struct wbsd_host* host = mmc_priv(mmc);
 976         u8 clk, setup, pwr;
 977
 978         DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
 979                 ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
 980
 981         spin_lock_bh(&host->lock);
 982
 983         /*
 984          * Reset the chip on each power off.
 985          * Should clear out any weird states.
 986          */
 987         if (ios->power_mode == MMC_POWER_OFF)
 988                 wbsd_init_device(host);
 989
 990         if (ios->clock >= 24000000)
 991                 clk = WBSD_CLK_24M;
 992         else if (ios->clock >= 16000000)
 993                 clk = WBSD_CLK_16M;
 994         else if (ios->clock >= 12000000)
 995                 clk = WBSD_CLK_12M;
 996         else
 997                 clk = WBSD_CLK_375K;
 998
 999         /*
1000          * Only write to the clock register when
1001          * there is an actual change.
1002          */
1003         if (clk != host->clk)
1004         {
1005                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
1006                 host->clk = clk;
1007         }
1008
1009         /*
1010          * Power up card.
1011          */
1012         if (ios->power_mode != MMC_POWER_OFF)
1013         {
1014                 pwr = inb(host->base + WBSD_CSR);
1015                 pwr &= ~WBSD_POWER_N;
1016                 outb(pwr, host->base + WBSD_CSR);
1017         }
1018
1019         /*
1020          * MMC cards need to have pin 1 high during init.
1021          * Init time corresponds rather nicely with the bus mode.
1022          * It wreaks havoc with the card detection though so
1023          * that needs to be disabed.
1024          */
1025         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
1026         if ((ios->power_mode == MMC_POWER_ON) &&
1027                 (ios->bus_mode == MMC_BUSMODE_OPENDRAIN))
1028         {
1029                 setup |= WBSD_DAT3_H;
1030                 host->flags |= WBSD_FIGNORE_DETECT;
1031         }
1032         else
1033         {
1034                 setup &= ~WBSD_DAT3_H;
1035                 host->flags &= ~WBSD_FIGNORE_DETECT;
1036         }
1037         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1038
1039         spin_unlock_bh(&host->lock);
1040 }
1041
1042 static struct mmc_host_ops wbsd_ops = {
1043         .request        = wbsd_request,
1044         .set_ios        = wbsd_set_ios,
1045 };
1046
1047 /*****************************************************************************\
1048  *                                                                           *
1049  * Interrupt handling                                                        *
1050  *                                                                           *
1051 \*****************************************************************************/
1052
1053 /*
1054  * Tasklets
1055  */
1056
1057 inline static struct mmc_data* wbsd_get_data(struct wbsd_host* host)
1058 {
1059         WARN_ON(!host->mrq);
1060         if (!host->mrq)
1061                 return NULL;
1062
1063         WARN_ON(!host->mrq->cmd);
1064         if (!host->mrq->cmd)
1065                 return NULL;
1066
1067         WARN_ON(!host->mrq->cmd->data);
1068         if (!host->mrq->cmd->data)
1069                 return NULL;
1070
1071         return host->mrq->cmd->data;
1072 }
1073
1074 static void wbsd_tasklet_card(unsigned long param)
1075 {
1076         struct wbsd_host* host = (struct wbsd_host*)param;
1077         u8 csr;
1078         int change = 0;
1079
1080         spin_lock(&host->lock);
1081
1082         if (host->flags & WBSD_FIGNORE_DETECT)
1083         {
1084                 spin_unlock(&host->lock);
1085                 return;
1086         }
1087
1088         csr = inb(host->base + WBSD_CSR);
1089         WARN_ON(csr == 0xff);
1090
1091         if (csr & WBSD_CARDPRESENT)
1092         {
1093                 if (!(host->flags & WBSD_FCARD_PRESENT))
1094                 {
1095                         DBG("Card inserted\n");
1096                         host->flags |= WBSD_FCARD_PRESENT;
1097                         change = 1;
1098                 }
1099         }
1100         else if (host->flags & WBSD_FCARD_PRESENT)
1101         {
1102                 DBG("Card removed\n");
1103                 host->flags &= ~WBSD_FCARD_PRESENT;
1104                 change = 1;
1105
1106                 if (host->mrq)
1107                 {
1108                         printk(KERN_ERR DRIVER_NAME
1109                                 ": Card removed during transfer!\n");
1110                         wbsd_reset(host);
1111
1112                         host->mrq->cmd->error = MMC_ERR_FAILED;
1113                         tasklet_schedule(&host->finish_tasklet);
1114                 }
1115         }
1116
1117         /*
1118          * Unlock first since we might get a call back.
1119          */
1120         spin_unlock(&host->lock);
1121
1122         if (change)
1123                 mmc_detect_change(host->mmc);
1124 }
1125
1126 static void wbsd_tasklet_fifo(unsigned long param)
1127 {
1128         struct wbsd_host* host = (struct wbsd_host*)param;
1129         struct mmc_data* data;
1130
1131         spin_lock(&host->lock);
1132
1133         if (!host->mrq)
1134                 goto end;
1135
1136         data = wbsd_get_data(host);
1137         if (!data)
1138                 goto end;
1139
1140         if (data->flags & MMC_DATA_WRITE)
1141                 wbsd_fill_fifo(host);
1142         else
1143                 wbsd_empty_fifo(host);
1144
1145         /*
1146          * Done?
1147          */
1148         if (host->size == data->bytes_xfered)
1149         {
1150                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1151                 tasklet_schedule(&host->finish_tasklet);
1152         }
1153
1154 end:
1155         spin_unlock(&host->lock);
1156 }
1157
1158 static void wbsd_tasklet_crc(unsigned long param)
1159 {
1160         struct wbsd_host* host = (struct wbsd_host*)param;
1161         struct mmc_data* data;
1162
1163         spin_lock(&host->lock);
1164
1165         if (!host->mrq)
1166                 goto end;
1167
1168         data = wbsd_get_data(host);
1169         if (!data)
1170                 goto end;
1171
1172         DBGF("CRC error\n");
1173
1174         data->error = MMC_ERR_BADCRC;
1175
1176         tasklet_schedule(&host->finish_tasklet);
1177
1178 end:
1179         spin_unlock(&host->lock);
1180 }
1181
1182 static void wbsd_tasklet_timeout(unsigned long param)
1183 {
1184         struct wbsd_host* host = (struct wbsd_host*)param;
1185         struct mmc_data* data;
1186
1187         spin_lock(&host->lock);
1188
1189         if (!host->mrq)
1190                 goto end;
1191
1192         data = wbsd_get_data(host);
1193         if (!data)
1194                 goto end;
1195
1196         DBGF("Timeout\n");
1197
1198         data->error = MMC_ERR_TIMEOUT;
1199
1200         tasklet_schedule(&host->finish_tasklet);
1201
1202 end:
1203         spin_unlock(&host->lock);
1204 }
1205
1206 static void wbsd_tasklet_finish(unsigned long param)
1207 {
1208         struct wbsd_host* host = (struct wbsd_host*)param;
1209         struct mmc_data* data;
1210
1211         spin_lock(&host->lock);
1212
1213         WARN_ON(!host->mrq);
1214         if (!host->mrq)
1215                 goto end;
1216
1217         data = wbsd_get_data(host);
1218         if (!data)
1219                 goto end;
1220
1221         wbsd_finish_data(host, data);
1222
1223 end:
1224         spin_unlock(&host->lock);
1225 }
1226
1227 static void wbsd_tasklet_block(unsigned long param)
1228 {
1229         struct wbsd_host* host = (struct wbsd_host*)param;
1230         struct mmc_data* data;
1231
1232         spin_lock(&host->lock);
1233
1234         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1235                 WBSD_CRC_OK)
1236         {
1237                 data = wbsd_get_data(host);
1238                 if (!data)
1239                         goto end;
1240
1241                 DBGF("CRC error\n");
1242
1243                 data->error = MMC_ERR_BADCRC;
1244
1245                 tasklet_schedule(&host->finish_tasklet);
1246         }
1247
1248 end:
1249         spin_unlock(&host->lock);
1250 }
1251
1252 /*
1253  * Interrupt handling
1254  */
1255
1256 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1257 {
1258         struct wbsd_host* host = dev_id;
1259         int isr;
1260
1261         isr = inb(host->base + WBSD_ISR);
1262
1263         /*
1264          * Was it actually our hardware that caused the interrupt?
1265          */
1266         if (isr == 0xff || isr == 0x00)
1267                 return IRQ_NONE;
1268
1269         host->isr |= isr;
1270
1271         /*
1272          * Schedule tasklets as needed.
1273          */
1274         if (isr & WBSD_INT_CARD)
1275                 tasklet_schedule(&host->card_tasklet);
1276         if (isr & WBSD_INT_FIFO_THRE)
1277                 tasklet_schedule(&host->fifo_tasklet);
1278         if (isr & WBSD_INT_CRC)
1279                 tasklet_hi_schedule(&host->crc_tasklet);
1280         if (isr & WBSD_INT_TIMEOUT)
1281                 tasklet_hi_schedule(&host->timeout_tasklet);
1282         if (isr & WBSD_INT_BUSYEND)
1283                 tasklet_hi_schedule(&host->block_tasklet);
1284         if (isr & WBSD_INT_TC)
1285                 tasklet_schedule(&host->finish_tasklet);
1286
1287         return IRQ_HANDLED;
1288 }
1289
1290 /*****************************************************************************\
1291  *                                                                           *
1292  * Device initialisation and shutdown                                        *
1293  *                                                                           *
1294 \*****************************************************************************/
1295
1296 /*
1297  * Allocate/free MMC structure.
1298  */
1299
1300 static int __devinit wbsd_alloc_mmc(struct device* dev)
1301 {
1302         struct mmc_host* mmc;
1303         struct wbsd_host* host;
1304
1305         /*
1306          * Allocate MMC structure.
1307          */
1308         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1309         if (!mmc)
1310                 return -ENOMEM;
1311
1312         host = mmc_priv(mmc);
1313         host->mmc = mmc;
1314
1315         host->dma = -1;
1316
1317         /*
1318          * Set host parameters.
1319          */
1320         mmc->ops = &wbsd_ops;
1321         mmc->f_min = 375000;
1322         mmc->f_max = 24000000;
1323         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1324
1325         spin_lock_init(&host->lock);
1326
1327         /*
1328          * Maximum number of segments. Worst case is one sector per segment
1329          * so this will be 64kB/512.
1330          */
1331         mmc->max_hw_segs = 128;
1332         mmc->max_phys_segs = 128;
1333
1334         /*
1335          * Maximum number of sectors in one transfer. Also limited by 64kB
1336          * buffer.
1337          */
1338         mmc->max_sectors = 128;
1339
1340         /*
1341          * Maximum segment size. Could be one segment with the maximum number
1342          * of segments.
1343          */
1344         mmc->max_seg_size = mmc->max_sectors * 512;
1345
1346         dev_set_drvdata(dev, mmc);
1347
1348         return 0;
1349 }
1350
1351 static void __devexit wbsd_free_mmc(struct device* dev)
1352 {
1353         struct mmc_host* mmc;
1354
1355         mmc = dev_get_drvdata(dev);
1356         if (!mmc)
1357                 return;
1358
1359         mmc_free_host(mmc);
1360
1361         dev_set_drvdata(dev, NULL);
1362 }
1363
1364 /*
1365  * Scan for known chip id:s
1366  */
1367
1368 static int __devinit wbsd_scan(struct wbsd_host* host)
1369 {
1370         int i, j, k;
1371         int id;
1372
1373         /*
1374          * Iterate through all ports, all codes to
1375          * find hardware that is in our known list.
1376          */
1377         for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
1378         {
1379                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1380                         continue;
1381
1382                 for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
1383                 {
1384                         id = 0xFFFF;
1385
1386                         outb(unlock_codes[j], config_ports[i]);
1387                         outb(unlock_codes[j], config_ports[i]);
1388
1389                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1390                         id = inb(config_ports[i] + 1) << 8;
1391
1392                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1393                         id |= inb(config_ports[i] + 1);
1394
1395                         for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
1396                         {
1397                                 if (id == valid_ids[k])
1398                                 {
1399                                         host->chip_id = id;
1400                                         host->config = config_ports[i];
1401                                         host->unlock_code = unlock_codes[i];
1402
1403                                         return 0;
1404                                 }
1405                         }
1406
1407                         if (id != 0xFFFF)
1408                         {
1409                                 DBG("Unknown hardware (id %x) found at %x\n",
1410                                         id, config_ports[i]);
1411                         }
1412
1413                         outb(LOCK_CODE, config_ports[i]);
1414                 }
1415
1416                 release_region(config_ports[i], 2);
1417         }
1418
1419         return -ENODEV;
1420 }
1421
1422 /*
1423  * Allocate/free io port ranges
1424  */
1425
1426 static int __devinit wbsd_request_region(struct wbsd_host* host, int base)
1427 {
1428         if (io & 0x7)
1429                 return -EINVAL;
1430
1431         if (!request_region(base, 8, DRIVER_NAME))
1432                 return -EIO;
1433
1434         host->base = io;
1435
1436         return 0;
1437 }
1438
1439 static void __devexit wbsd_release_regions(struct wbsd_host* host)
1440 {
1441         if (host->base)
1442                 release_region(host->base, 8);
1443
1444         host->base = 0;
1445
1446         if (host->config)
1447                 release_region(host->config, 2);
1448
1449         host->config = 0;
1450 }
1451
1452 /*
1453  * Allocate/free DMA port and buffer
1454  */
1455
1456 static void __devinit wbsd_request_dma(struct wbsd_host* host, int dma)
1457 {
1458         if (dma < 0)
1459                 return;
1460
1461         if (request_dma(dma, DRIVER_NAME))
1462                 goto err;
1463
1464         /*
1465          * We need to allocate a special buffer in
1466          * order for ISA to be able to DMA to it.
1467          */
1468         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1469                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1470         if (!host->dma_buffer)
1471                 goto free;
1472
1473         /*
1474          * Translate the address to a physical address.
1475          */
1476         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1477                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1478
1479         /*
1480          * ISA DMA must be aligned on a 64k basis.
1481          */
1482         if ((host->dma_addr & 0xffff) != 0)
1483                 goto kfree;
1484         /*
1485          * ISA cannot access memory above 16 MB.
1486          */
1487         else if (host->dma_addr >= 0x1000000)
1488                 goto kfree;
1489
1490         host->dma = dma;
1491
1492         return;
1493
1494 kfree:
1495         /*
1496          * If we've gotten here then there is some kind of alignment bug
1497          */
1498         BUG_ON(1);
1499
1500         dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1501                 DMA_BIDIRECTIONAL);
1502         host->dma_addr = (dma_addr_t)NULL;
1503
1504         kfree(host->dma_buffer);
1505         host->dma_buffer = NULL;
1506
1507 free:
1508         free_dma(dma);
1509
1510 err:
1511         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1512                 "Falling back on FIFO.\n", dma);
1513 }
1514
1515 static void __devexit wbsd_release_dma(struct wbsd_host* host)
1516 {
1517         if (host->dma_addr)
1518                 dma_unmap_single(host->mmc->dev, host->dma_addr, WBSD_DMA_SIZE,
1519                         DMA_BIDIRECTIONAL);
1520         if (host->dma_buffer)
1521                 kfree(host->dma_buffer);
1522         if (host->dma >= 0)
1523                 free_dma(host->dma);
1524
1525         host->dma = -1;
1526         host->dma_buffer = NULL;
1527         host->dma_addr = (dma_addr_t)NULL;
1528 }
1529
1530 /*
1531  * Allocate/free IRQ.
1532  */
1533
1534 static int __devinit wbsd_request_irq(struct wbsd_host* host, int irq)
1535 {
1536         int ret;
1537
1538         /*
1539          * Allocate interrupt.
1540          */
1541
1542         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1543         if (ret)
1544                 return ret;
1545
1546         host->irq = irq;
1547
1548         /*
1549          * Set up tasklets.
1550          */
1551         tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
1552         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
1553         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
1554         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
1555         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
1556         tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
1557
1558         return 0;
1559 }
1560
1561 static void __devexit wbsd_release_irq(struct wbsd_host* host)
1562 {
1563         if (!host->irq)
1564                 return;
1565
1566         free_irq(host->irq, host);
1567
1568         host->irq = 0;
1569
1570         tasklet_kill(&host->card_tasklet);
1571         tasklet_kill(&host->fifo_tasklet);
1572         tasklet_kill(&host->crc_tasklet);
1573         tasklet_kill(&host->timeout_tasklet);
1574         tasklet_kill(&host->finish_tasklet);
1575         tasklet_kill(&host->block_tasklet);
1576 }
1577
1578 /*
1579  * Allocate all resources for the host.
1580  */
1581
1582 static int __devinit wbsd_request_resources(struct wbsd_host* host,
1583         int base, int irq, int dma)
1584 {
1585         int ret;
1586
1587         /*
1588          * Allocate I/O ports.
1589          */
1590         ret = wbsd_request_region(host, base);
1591         if (ret)
1592                 return ret;
1593
1594         /*
1595          * Allocate interrupt.
1596          */
1597         ret = wbsd_request_irq(host, irq);
1598         if (ret)
1599                 return ret;
1600
1601         /*
1602          * Allocate DMA.
1603          */
1604         wbsd_request_dma(host, dma);
1605
1606         return 0;
1607 }
1608
1609 /*
1610  * Release all resources for the host.
1611  */
1612
1613 static void __devexit wbsd_release_resources(struct wbsd_host* host)
1614 {
1615         wbsd_release_dma(host);
1616         wbsd_release_irq(host);
1617         wbsd_release_regions(host);
1618 }
1619
1620 /*
1621  * Configure the resources the chip should use.
1622  */
1623
1624 static void __devinit wbsd_chip_config(struct wbsd_host* host)
1625 {
1626         /*
1627          * Reset the chip.
1628          */
1629         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1630         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1631
1632         /*
1633          * Select SD/MMC function.
1634          */
1635         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1636
1637         /*
1638          * Set up card detection.
1639          */
1640         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1641
1642         /*
1643          * Configure chip
1644          */
1645         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1646         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1647
1648         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1649
1650         if (host->dma >= 0)
1651                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1652
1653         /*
1654          * Enable and power up chip.
1655          */
1656         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1657         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1658 }
1659
1660 /*
1661  * Check that configured resources are correct.
1662  */
1663
1664 static int __devinit wbsd_chip_validate(struct wbsd_host* host)
1665 {
1666         int base, irq, dma;
1667
1668         /*
1669          * Select SD/MMC function.
1670          */
1671         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1672
1673         /*
1674          * Read configuration.
1675          */
1676         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1677         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1678
1679         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1680
1681         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1682
1683         /*
1684          * Validate against given configuration.
1685          */
1686         if (base != host->base)
1687                 return 0;
1688         if (irq != host->irq)
1689                 return 0;
1690         if ((dma != host->dma) && (host->dma != -1))
1691                 return 0;
1692
1693         return 1;
1694 }
1695
1696 /*****************************************************************************\
1697  *                                                                           *
1698  * Devices setup and shutdown                                                *
1699  *                                                                           *
1700 \*****************************************************************************/
1701
1702 static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
1703         int pnp)
1704 {
1705         struct wbsd_host* host = NULL;
1706         struct mmc_host* mmc = NULL;
1707         int ret;
1708
1709         ret = wbsd_alloc_mmc(dev);
1710         if (ret)
1711                 return ret;
1712
1713         mmc = dev_get_drvdata(dev);
1714         host = mmc_priv(mmc);
1715
1716         /*
1717          * Scan for hardware.
1718          */
1719         ret = wbsd_scan(host);
1720         if (ret)
1721         {
1722                 if (pnp && (ret == -ENODEV))
1723                 {
1724                         printk(KERN_WARNING DRIVER_NAME
1725                                 ": Unable to confirm device presence. You may "
1726                                 "experience lock-ups.\n");
1727                 }
1728                 else
1729                 {
1730                         wbsd_free_mmc(dev);
1731                         return ret;
1732                 }
1733         }
1734
1735         /*
1736          * Request resources.
1737          */
1738         ret = wbsd_request_resources(host, io, irq, dma);
1739         if (ret)
1740         {
1741                 wbsd_release_resources(host);
1742                 wbsd_free_mmc(dev);
1743                 return ret;
1744         }
1745
1746         /*
1747          * See if chip needs to be configured.
1748          */
1749         if (pnp && (host->config != 0))
1750         {
1751                 if (!wbsd_chip_validate(host))
1752                 {
1753                         printk(KERN_WARNING DRIVER_NAME
1754                                 ": PnP active but chip not configured! "
1755                                 "You probably have a buggy BIOS. "
1756                                 "Configuring chip manually.\n");
1757                         wbsd_chip_config(host);
1758                 }
1759         }
1760         else
1761                 wbsd_chip_config(host);
1762
1763         /*
1764          * Power Management stuff. No idea how this works.
1765          * Not tested.
1766          */
1767 #ifdef CONFIG_PM
1768         if (host->config)
1769                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1770 #endif
1771         /*
1772          * Allow device to initialise itself properly.
1773          */
1774         mdelay(5);
1775
1776         /*
1777          * Reset the chip into a known state.
1778          */
1779         wbsd_init_device(host);
1780
1781         mmc_add_host(mmc);
1782
1783         printk(KERN_INFO "%s: W83L51xD", mmc->host_name);
1784         if (host->chip_id != 0)
1785                 printk(" id %x", (int)host->chip_id);
1786         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1787         if (host->dma >= 0)
1788                 printk(" dma %d", (int)host->dma);
1789         else
1790                 printk(" FIFO");
1791         if (pnp)
1792                 printk(" PnP");
1793         printk("\n");
1794
1795         return 0;
1796 }
1797
1798 static void __devexit wbsd_shutdown(struct device* dev, int pnp)
1799 {
1800         struct mmc_host* mmc = dev_get_drvdata(dev);
1801         struct wbsd_host* host;
1802
1803         if (!mmc)
1804                 return;
1805
1806         host = mmc_priv(mmc);
1807
1808         mmc_remove_host(mmc);
1809
1810         if (!pnp)
1811         {
1812                 /*
1813                  * Power down the SD/MMC function.
1814                  */
1815                 wbsd_unlock_config(host);
1816                 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1817                 wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1818                 wbsd_lock_config(host);
1819         }
1820
1821         wbsd_release_resources(host);
1822
1823         wbsd_free_mmc(dev);
1824 }
1825
1826 /*
1827  * Non-PnP
1828  */
1829
1830 static int __devinit wbsd_probe(struct device* dev)
1831 {
1832         return wbsd_init(dev, io, irq, dma, 0);
1833 }
1834
1835 static int __devexit wbsd_remove(struct device* dev)
1836 {
1837         wbsd_shutdown(dev, 0);
1838
1839         return 0;
1840 }
1841
1842 /*
1843  * PnP
1844  */
1845
1846 #ifdef CONFIG_PNP
1847
1848 static int __devinit
1849 wbsd_pnp_probe(struct pnp_dev * pnpdev, const struct pnp_device_id *dev_id)
1850 {
1851         int io, irq, dma;
1852
1853         /*
1854          * Get resources from PnP layer.
1855          */
1856         io = pnp_port_start(pnpdev, 0);
1857         irq = pnp_irq(pnpdev, 0);
1858         if (pnp_dma_valid(pnpdev, 0))
1859                 dma = pnp_dma(pnpdev, 0);
1860         else
1861                 dma = -1;
1862
1863         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1864
1865         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1866 }
1867
1868 static void __devexit wbsd_pnp_remove(struct pnp_dev * dev)
1869 {
1870         wbsd_shutdown(&dev->dev, 1);
1871 }
1872
1873 #endif /* CONFIG_PNP */
1874
1875 /*
1876  * Power management
1877  */
1878
1879 #ifdef CONFIG_PM
1880 static int wbsd_suspend(struct device *dev, pm_message_t state, u32 level)
1881 {
1882         DBGF("Not yet supported\n");
1883
1884         return 0;
1885 }
1886
1887 static int wbsd_resume(struct device *dev, u32 level)
1888 {
1889         DBGF("Not yet supported\n");
1890
1891         return 0;
1892 }
1893 #else
1894 #define wbsd_suspend NULL
1895 #define wbsd_resume NULL
1896 #endif
1897
1898 static struct platform_device *wbsd_device;
1899
1900 static struct device_driver wbsd_driver = {
1901         .name           = DRIVER_NAME,
1902         .bus            = &platform_bus_type,
1903         .probe          = wbsd_probe,
1904         .remove         = wbsd_remove,
1905
1906         .suspend        = wbsd_suspend,
1907         .resume         = wbsd_resume,
1908 };
1909
1910 #ifdef CONFIG_PNP
1911
1912 static struct pnp_driver wbsd_pnp_driver = {
1913         .name           = DRIVER_NAME,
1914         .id_table       = pnp_dev_table,
1915         .probe          = wbsd_pnp_probe,
1916         .remove         = wbsd_pnp_remove,
1917 };
1918
1919 #endif /* CONFIG_PNP */
1920
1921 /*
1922  * Module loading/unloading
1923  */
1924
1925 static int __init wbsd_drv_init(void)
1926 {
1927         int result;
1928
1929         printk(KERN_INFO DRIVER_NAME
1930                 ": Winbond W83L51xD SD/MMC card interface driver, "
1931                 DRIVER_VERSION "\n");
1932         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1933
1934 #ifdef CONFIG_PNP
1935
1936         if (!nopnp)
1937         {
1938                 result = pnp_register_driver(&wbsd_pnp_driver);
1939                 if (result < 0)
1940                         return result;
1941         }
1942
1943 #endif /* CONFIG_PNP */
1944
1945         if (nopnp)
1946         {
1947                 result = driver_register(&wbsd_driver);
1948                 if (result < 0)
1949                         return result;
1950
1951                 wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
1952                         NULL, 0);
1953                 if (IS_ERR(wbsd_device))
1954                         return PTR_ERR(wbsd_device);
1955         }
1956
1957         return 0;
1958 }
1959
1960 static void __exit wbsd_drv_exit(void)
1961 {
1962 #ifdef CONFIG_PNP
1963
1964         if (!nopnp)
1965                 pnp_unregister_driver(&wbsd_pnp_driver);
1966
1967 #endif /* CONFIG_PNP */
1968
1969         if (nopnp)
1970         {
1971                 platform_device_unregister(wbsd_device);
1972
1973                 driver_unregister(&wbsd_driver);
1974         }
1975
1976         DBG("unloaded\n");
1977 }
1978
1979 module_init(wbsd_drv_init);
1980 module_exit(wbsd_drv_exit);
1981 #ifdef CONFIG_PNP
1982 module_param(nopnp, uint, 0444);
1983 #endif
1984 module_param(io, uint, 0444);
1985 module_param(irq, uint, 0444);
1986 module_param(dma, int, 0444);
1987
1988 MODULE_LICENSE("GPL");
1989 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
1990 MODULE_VERSION(DRIVER_VERSION);
1991
1992 #ifdef CONFIG_PNP
1993 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
1994 #endif
1995 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
1996 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
1997 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");