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   1 /*
   2  *  linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver
   3  *
   4  *  Copyright (C) 2004-2005 Pierre Ossman, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *
  11  * Warning!
  12  *
  13  * Changes to the FIFO system should be done with extreme care since
  14  * the hardware is full of bugs related to the FIFO. Known issues are:
  15  *
  16  * - FIFO size field in FSR is always zero.
  17  *
  18  * - FIFO interrupts tend not to work as they should. Interrupts are
  19  *   triggered only for full/empty events, not for threshold values.
  20  *
  21  * - On APIC systems the FIFO empty interrupt is sometimes lost.
  22  */
  23
  24 #include <linux/config.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/init.h>
  28 #include <linux/ioport.h>
  29 #include <linux/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 "1.5"
  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                  * Release ISA DMA controller.
 223                  */
 224                 dmaflags = claim_dma_lock();
 225                 disable_dma(host->dma);
 226                 clear_dma_ff(host->dma);
 227                 release_dma_lock(dmaflags);
 228
 229                 /*
 230                  * Disable DMA on host.
 231                  */
 232                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 233         }
 234
 235         host->mrq = NULL;
 236
 237         /*
 238          * MMC layer might call back into the driver so first unlock.
 239          */
 240         spin_unlock(&host->lock);
 241         mmc_request_done(host->mmc, mrq);
 242         spin_lock(&host->lock);
 243 }
 244
 245 /*
 246  * Scatter/gather functions
 247  */
 248
 249 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
 250 {
 251         /*
 252          * Get info. about SG list from data structure.
 253          */
 254         host->cur_sg = data->sg;
 255         host->num_sg = data->sg_len;
 256
 257         host->offset = 0;
 258         host->remain = host->cur_sg->length;
 259 }
 260
 261 static inline int wbsd_next_sg(struct wbsd_host *host)
 262 {
 263         /*
 264          * Skip to next SG entry.
 265          */
 266         host->cur_sg++;
 267         host->num_sg--;
 268
 269         /*
 270          * Any entries left?
 271          */
 272         if (host->num_sg > 0) {
 273                 host->offset = 0;
 274                 host->remain = host->cur_sg->length;
 275         }
 276
 277         return host->num_sg;
 278 }
 279
 280 static inline char *wbsd_kmap_sg(struct wbsd_host *host)
 281 {
 282         host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
 283                 host->cur_sg->offset;
 284         return host->mapped_sg;
 285 }
 286
 287 static inline void wbsd_kunmap_sg(struct wbsd_host *host)
 288 {
 289         kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
 290 }
 291
 292 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
 293 {
 294         unsigned int len, i, size;
 295         struct scatterlist *sg;
 296         char *dmabuf = host->dma_buffer;
 297         char *sgbuf;
 298
 299         size = host->size;
 300
 301         sg = data->sg;
 302         len = data->sg_len;
 303
 304         /*
 305          * Just loop through all entries. Size might not
 306          * be the entire list though so make sure that
 307          * we do not transfer too much.
 308          */
 309         for (i = 0; i < len; i++) {
 310                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
 311                 if (size < sg[i].length)
 312                         memcpy(dmabuf, sgbuf, size);
 313                 else
 314                         memcpy(dmabuf, sgbuf, sg[i].length);
 315                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
 316                 dmabuf += sg[i].length;
 317
 318                 if (size < sg[i].length)
 319                         size = 0;
 320                 else
 321                         size -= sg[i].length;
 322
 323                 if (size == 0)
 324                         break;
 325         }
 326
 327         /*
 328          * Check that we didn't get a request to transfer
 329          * more data than can fit into the SG list.
 330          */
 331
 332         BUG_ON(size != 0);
 333
 334         host->size -= size;
 335 }
 336
 337 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
 338 {
 339         unsigned int len, i, size;
 340         struct scatterlist *sg;
 341         char *dmabuf = host->dma_buffer;
 342         char *sgbuf;
 343
 344         size = host->size;
 345
 346         sg = data->sg;
 347         len = data->sg_len;
 348
 349         /*
 350          * Just loop through all entries. Size might not
 351          * be the entire list though so make sure that
 352          * we do not transfer too much.
 353          */
 354         for (i = 0; i < len; i++) {
 355                 sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
 356                 if (size < sg[i].length)
 357                         memcpy(sgbuf, dmabuf, size);
 358                 else
 359                         memcpy(sgbuf, dmabuf, sg[i].length);
 360                 kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
 361                 dmabuf += sg[i].length;
 362
 363                 if (size < sg[i].length)
 364                         size = 0;
 365                 else
 366                         size -= sg[i].length;
 367
 368                 if (size == 0)
 369                         break;
 370         }
 371
 372         /*
 373          * Check that we didn't get a request to transfer
 374          * more data than can fit into the SG list.
 375          */
 376
 377         BUG_ON(size != 0);
 378
 379         host->size -= size;
 380 }
 381
 382 /*
 383  * Command handling
 384  */
 385
 386 static inline void wbsd_get_short_reply(struct wbsd_host *host,
 387                                         struct mmc_command *cmd)
 388 {
 389         /*
 390          * Correct response type?
 391          */
 392         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
 393                 cmd->error = MMC_ERR_INVALID;
 394                 return;
 395         }
 396
 397         cmd->resp[0]  = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
 398         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
 399         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
 400         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
 401         cmd->resp[1]  = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
 402 }
 403
 404 static inline void wbsd_get_long_reply(struct wbsd_host *host,
 405         struct mmc_command *cmd)
 406 {
 407         int i;
 408
 409         /*
 410          * Correct response type?
 411          */
 412         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
 413                 cmd->error = MMC_ERR_INVALID;
 414                 return;
 415         }
 416
 417         for (i = 0; i < 4; i++) {
 418                 cmd->resp[i] =
 419                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
 420                 cmd->resp[i] |=
 421                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
 422                 cmd->resp[i] |=
 423                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
 424                 cmd->resp[i] |=
 425                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
 426         }
 427 }
 428
 429 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
 430 {
 431         int i;
 432         u8 status, isr;
 433
 434         DBGF("Sending cmd (%x)\n", cmd->opcode);
 435
 436         /*
 437          * Clear accumulated ISR. The interrupt routine
 438          * will fill this one with events that occur during
 439          * transfer.
 440          */
 441         host->isr = 0;
 442
 443         /*
 444          * Send the command (CRC calculated by host).
 445          */
 446         outb(cmd->opcode, host->base + WBSD_CMDR);
 447         for (i = 3; i >= 0; i--)
 448                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
 449
 450         cmd->error = MMC_ERR_NONE;
 451
 452         /*
 453          * Wait for the request to complete.
 454          */
 455         do {
 456                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 457         } while (status & WBSD_CARDTRAFFIC);
 458
 459         /*
 460          * Do we expect a reply?
 461          */
 462         if (cmd->flags & MMC_RSP_PRESENT) {
 463                 /*
 464                  * Read back status.
 465                  */
 466                 isr = host->isr;
 467
 468                 /* Card removed? */
 469                 if (isr & WBSD_INT_CARD)
 470                         cmd->error = MMC_ERR_TIMEOUT;
 471                 /* Timeout? */
 472                 else if (isr & WBSD_INT_TIMEOUT)
 473                         cmd->error = MMC_ERR_TIMEOUT;
 474                 /* CRC? */
 475                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 476                         cmd->error = MMC_ERR_BADCRC;
 477                 /* All ok */
 478                 else {
 479                         if (cmd->flags & MMC_RSP_136)
 480                                 wbsd_get_long_reply(host, cmd);
 481                         else
 482                                 wbsd_get_short_reply(host, cmd);
 483                 }
 484         }
 485
 486         DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
 487 }
 488
 489 /*
 490  * Data functions
 491  */
 492
 493 static void wbsd_empty_fifo(struct wbsd_host *host)
 494 {
 495         struct mmc_data *data = host->mrq->cmd->data;
 496         char *buffer;
 497         int i, fsr, fifo;
 498
 499         /*
 500          * Handle excessive data.
 501          */
 502         if (data->bytes_xfered == host->size)
 503                 return;
 504
 505         buffer = wbsd_kmap_sg(host) + host->offset;
 506
 507         /*
 508          * Drain the fifo. This has a tendency to loop longer
 509          * than the FIFO length (usually one block).
 510          */
 511         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
 512                 /*
 513                  * The size field in the FSR is broken so we have to
 514                  * do some guessing.
 515                  */
 516                 if (fsr & WBSD_FIFO_FULL)
 517                         fifo = 16;
 518                 else if (fsr & WBSD_FIFO_FUTHRE)
 519                         fifo = 8;
 520                 else
 521                         fifo = 1;
 522
 523                 for (i = 0; i < fifo; i++) {
 524                         *buffer = inb(host->base + WBSD_DFR);
 525                         buffer++;
 526                         host->offset++;
 527                         host->remain--;
 528
 529                         data->bytes_xfered++;
 530
 531                         /*
 532                          * Transfer done?
 533                          */
 534                         if (data->bytes_xfered == host->size) {
 535                                 wbsd_kunmap_sg(host);
 536                                 return;
 537                         }
 538
 539                         /*
 540                          * End of scatter list entry?
 541                          */
 542                         if (host->remain == 0) {
 543                                 wbsd_kunmap_sg(host);
 544
 545                                 /*
 546                                  * Get next entry. Check if last.
 547                                  */
 548                                 if (!wbsd_next_sg(host)) {
 549                                         /*
 550                                          * We should never reach this point.
 551                                          * It means that we're trying to
 552                                          * transfer more blocks than can fit
 553                                          * into the scatter list.
 554                                          */
 555                                         BUG_ON(1);
 556
 557                                         host->size = data->bytes_xfered;
 558
 559                                         return;
 560                                 }
 561
 562                                 buffer = wbsd_kmap_sg(host);
 563                         }
 564                 }
 565         }
 566
 567         wbsd_kunmap_sg(host);
 568
 569         /*
 570          * This is a very dirty hack to solve a
 571          * hardware problem. The chip doesn't trigger
 572          * FIFO threshold interrupts properly.
 573          */
 574         if ((host->size - data->bytes_xfered) < 16)
 575                 tasklet_schedule(&host->fifo_tasklet);
 576 }
 577
 578 static void wbsd_fill_fifo(struct wbsd_host *host)
 579 {
 580         struct mmc_data *data = host->mrq->cmd->data;
 581         char *buffer;
 582         int i, fsr, fifo;
 583
 584         /*
 585          * Check that we aren't being called after the
 586          * entire buffer has been transfered.
 587          */
 588         if (data->bytes_xfered == host->size)
 589                 return;
 590
 591         buffer = wbsd_kmap_sg(host) + host->offset;
 592
 593         /*
 594          * Fill the fifo. This has a tendency to loop longer
 595          * than the FIFO length (usually one block).
 596          */
 597         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
 598                 /*
 599                  * The size field in the FSR is broken so we have to
 600                  * do some guessing.
 601                  */
 602                 if (fsr & WBSD_FIFO_EMPTY)
 603                         fifo = 0;
 604                 else if (fsr & WBSD_FIFO_EMTHRE)
 605                         fifo = 8;
 606                 else
 607                         fifo = 15;
 608
 609                 for (i = 16; i > fifo; i--) {
 610                         outb(*buffer, host->base + WBSD_DFR);
 611                         buffer++;
 612                         host->offset++;
 613                         host->remain--;
 614
 615                         data->bytes_xfered++;
 616
 617                         /*
 618                          * Transfer done?
 619                          */
 620                         if (data->bytes_xfered == host->size) {
 621                                 wbsd_kunmap_sg(host);
 622                                 return;
 623                         }
 624
 625                         /*
 626                          * End of scatter list entry?
 627                          */
 628                         if (host->remain == 0) {
 629                                 wbsd_kunmap_sg(host);
 630
 631                                 /*
 632                                  * Get next entry. Check if last.
 633                                  */
 634                                 if (!wbsd_next_sg(host)) {
 635                                         /*
 636                                          * We should never reach this point.
 637                                          * It means that we're trying to
 638                                          * transfer more blocks than can fit
 639                                          * into the scatter list.
 640                                          */
 641                                         BUG_ON(1);
 642
 643                                         host->size = data->bytes_xfered;
 644
 645                                         return;
 646                                 }
 647
 648                                 buffer = wbsd_kmap_sg(host);
 649                         }
 650                 }
 651         }
 652
 653         wbsd_kunmap_sg(host);
 654
 655         /*
 656          * The controller stops sending interrupts for
 657          * 'FIFO empty' under certain conditions. So we
 658          * need to be a bit more pro-active.
 659          */
 660         tasklet_schedule(&host->fifo_tasklet);
 661 }
 662
 663 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
 664 {
 665         u16 blksize;
 666         u8 setup;
 667         unsigned long dmaflags;
 668
 669         DBGF("blksz %04x blks %04x flags %08x\n",
 670                 1 << data->blksz_bits, data->blocks, data->flags);
 671         DBGF("tsac %d ms nsac %d clk\n",
 672                 data->timeout_ns / 1000000, data->timeout_clks);
 673
 674         /*
 675          * Calculate size.
 676          */
 677         host->size = data->blocks << data->blksz_bits;
 678
 679         /*
 680          * Check timeout values for overflow.
 681          * (Yes, some cards cause this value to overflow).
 682          */
 683         if (data->timeout_ns > 127000000)
 684                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
 685         else {
 686                 wbsd_write_index(host, WBSD_IDX_TAAC,
 687                         data->timeout_ns / 1000000);
 688         }
 689
 690         if (data->timeout_clks > 255)
 691                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
 692         else
 693                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
 694
 695         /*
 696          * Inform the chip of how large blocks will be
 697          * sent. It needs this to determine when to
 698          * calculate CRC.
 699          *
 700          * Space for CRC must be included in the size.
 701          * Two bytes are needed for each data line.
 702          */
 703         if (host->bus_width == MMC_BUS_WIDTH_1) {
 704                 blksize = (1 << data->blksz_bits) + 2;
 705
 706                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 707                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 708         } else if (host->bus_width == MMC_BUS_WIDTH_4) {
 709                 blksize = (1 << data->blksz_bits) + 2 * 4;
 710
 711                 wbsd_write_index(host, WBSD_IDX_PBSMSB,
 712                         ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
 713                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 714         } else {
 715                 data->error = MMC_ERR_INVALID;
 716                 return;
 717         }
 718
 719         /*
 720          * Clear the FIFO. This is needed even for DMA
 721          * transfers since the chip still uses the FIFO
 722          * internally.
 723          */
 724         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 725         setup |= WBSD_FIFO_RESET;
 726         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 727
 728         /*
 729          * DMA transfer?
 730          */
 731         if (host->dma >= 0) {
 732                 /*
 733                  * The buffer for DMA is only 64 kB.
 734                  */
 735                 BUG_ON(host->size > 0x10000);
 736                 if (host->size > 0x10000) {
 737                         data->error = MMC_ERR_INVALID;
 738                         return;
 739                 }
 740
 741                 /*
 742                  * Transfer data from the SG list to
 743                  * the DMA buffer.
 744                  */
 745                 if (data->flags & MMC_DATA_WRITE)
 746                         wbsd_sg_to_dma(host, data);
 747
 748                 /*
 749                  * Initialise the ISA DMA controller.
 750                  */
 751                 dmaflags = claim_dma_lock();
 752                 disable_dma(host->dma);
 753                 clear_dma_ff(host->dma);
 754                 if (data->flags & MMC_DATA_READ)
 755                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 756                 else
 757                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 758                 set_dma_addr(host->dma, host->dma_addr);
 759                 set_dma_count(host->dma, host->size);
 760
 761                 enable_dma(host->dma);
 762                 release_dma_lock(dmaflags);
 763
 764                 /*
 765                  * Enable DMA on the host.
 766                  */
 767                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 768         } else {
 769                 /*
 770                  * This flag is used to keep printk
 771                  * output to a minimum.
 772                  */
 773                 host->firsterr = 1;
 774
 775                 /*
 776                  * Initialise the SG list.
 777                  */
 778                 wbsd_init_sg(host, data);
 779
 780                 /*
 781                  * Turn off DMA.
 782                  */
 783                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 784
 785                 /*
 786                  * Set up FIFO threshold levels (and fill
 787                  * buffer if doing a write).
 788                  */
 789                 if (data->flags & MMC_DATA_READ) {
 790                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 791                                 WBSD_FIFOEN_FULL | 8);
 792                 } else {
 793                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 794                                 WBSD_FIFOEN_EMPTY | 8);
 795                         wbsd_fill_fifo(host);
 796                 }
 797         }
 798
 799         data->error = MMC_ERR_NONE;
 800 }
 801
 802 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
 803 {
 804         unsigned long dmaflags;
 805         int count;
 806         u8 status;
 807
 808         WARN_ON(host->mrq == NULL);
 809
 810         /*
 811          * Send a stop command if needed.
 812          */
 813         if (data->stop)
 814                 wbsd_send_command(host, data->stop);
 815
 816         /*
 817          * Wait for the controller to leave data
 818          * transfer state.
 819          */
 820         do {
 821                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 822         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 823
 824         /*
 825          * DMA transfer?
 826          */
 827         if (host->dma >= 0) {
 828                 /*
 829                  * Disable DMA on the host.
 830                  */
 831                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 832
 833                 /*
 834                  * Turn of ISA DMA controller.
 835                  */
 836                 dmaflags = claim_dma_lock();
 837                 disable_dma(host->dma);
 838                 clear_dma_ff(host->dma);
 839                 count = get_dma_residue(host->dma);
 840                 release_dma_lock(dmaflags);
 841
 842                 /*
 843                  * Any leftover data?
 844                  */
 845                 if (count) {
 846                         printk(KERN_ERR "%s: Incomplete DMA transfer. "
 847                                 "%d bytes left.\n",
 848                                 mmc_hostname(host->mmc), count);
 849
 850                         data->error = MMC_ERR_FAILED;
 851                 } else {
 852                         /*
 853                          * Transfer data from DMA buffer to
 854                          * SG list.
 855                          */
 856                         if (data->flags & MMC_DATA_READ)
 857                                 wbsd_dma_to_sg(host, data);
 858
 859                         data->bytes_xfered = host->size;
 860                 }
 861         }
 862
 863         DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
 864
 865         wbsd_request_end(host, host->mrq);
 866 }
 867
 868 /*****************************************************************************\
 869  *                                                                           *
 870  * MMC layer callbacks                                                       *
 871  *                                                                           *
 872 \*****************************************************************************/
 873
 874 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 875 {
 876         struct wbsd_host *host = mmc_priv(mmc);
 877         struct mmc_command *cmd;
 878
 879         /*
 880          * Disable tasklets to avoid a deadlock.
 881          */
 882         spin_lock_bh(&host->lock);
 883
 884         BUG_ON(host->mrq != NULL);
 885
 886         cmd = mrq->cmd;
 887
 888         host->mrq = mrq;
 889
 890         /*
 891          * If there is no card in the slot then
 892          * timeout immediatly.
 893          */
 894         if (!(host->flags & WBSD_FCARD_PRESENT)) {
 895                 cmd->error = MMC_ERR_TIMEOUT;
 896                 goto done;
 897         }
 898
 899         /*
 900          * Does the request include data?
 901          */
 902         if (cmd->data) {
 903                 wbsd_prepare_data(host, cmd->data);
 904
 905                 if (cmd->data->error != MMC_ERR_NONE)
 906                         goto done;
 907         }
 908
 909         wbsd_send_command(host, cmd);
 910
 911         /*
 912          * If this is a data transfer the request
 913          * will be finished after the data has
 914          * transfered.
 915          */
 916         if (cmd->data && (cmd->error == MMC_ERR_NONE)) {
 917                 /*
 918                  * Dirty fix for hardware bug.
 919                  */
 920                 if (host->dma == -1)
 921                         tasklet_schedule(&host->fifo_tasklet);
 922
 923                 spin_unlock_bh(&host->lock);
 924
 925                 return;
 926         }
 927
 928 done:
 929         wbsd_request_end(host, mrq);
 930
 931         spin_unlock_bh(&host->lock);
 932 }
 933
 934 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 935 {
 936         struct wbsd_host *host = mmc_priv(mmc);
 937         u8 clk, setup, pwr;
 938
 939         DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
 940                 ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
 941                 ios->vdd, ios->bus_width);
 942
 943         spin_lock_bh(&host->lock);
 944
 945         /*
 946          * Reset the chip on each power off.
 947          * Should clear out any weird states.
 948          */
 949         if (ios->power_mode == MMC_POWER_OFF)
 950                 wbsd_init_device(host);
 951
 952         if (ios->clock >= 24000000)
 953                 clk = WBSD_CLK_24M;
 954         else if (ios->clock >= 16000000)
 955                 clk = WBSD_CLK_16M;
 956         else if (ios->clock >= 12000000)
 957                 clk = WBSD_CLK_12M;
 958         else
 959                 clk = WBSD_CLK_375K;
 960
 961         /*
 962          * Only write to the clock register when
 963          * there is an actual change.
 964          */
 965         if (clk != host->clk) {
 966                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
 967                 host->clk = clk;
 968         }
 969
 970         /*
 971          * Power up card.
 972          */
 973         if (ios->power_mode != MMC_POWER_OFF) {
 974                 pwr = inb(host->base + WBSD_CSR);
 975                 pwr &= ~WBSD_POWER_N;
 976                 outb(pwr, host->base + WBSD_CSR);
 977         }
 978
 979         /*
 980          * MMC cards need to have pin 1 high during init.
 981          * It wreaks havoc with the card detection though so
 982          * that needs to be disabled.
 983          */
 984         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 985         if (ios->chip_select == MMC_CS_HIGH) {
 986                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
 987                 setup |= WBSD_DAT3_H;
 988                 host->flags |= WBSD_FIGNORE_DETECT;
 989         } else {
 990                 if (setup & WBSD_DAT3_H) {
 991                         setup &= ~WBSD_DAT3_H;
 992
 993                         /*
 994                          * We cannot resume card detection immediatly
 995                          * because of capacitance and delays in the chip.
 996                          */
 997                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
 998                 }
 999         }
1000         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
1001
1002         /*
1003          * Store bus width for later. Will be used when
1004          * setting up the data transfer.
1005          */
1006         host->bus_width = ios->bus_width;
1007
1008         spin_unlock_bh(&host->lock);
1009 }
1010
1011 static int wbsd_get_ro(struct mmc_host *mmc)
1012 {
1013         struct wbsd_host *host = mmc_priv(mmc);
1014         u8 csr;
1015
1016         spin_lock_bh(&host->lock);
1017
1018         csr = inb(host->base + WBSD_CSR);
1019         csr |= WBSD_MSLED;
1020         outb(csr, host->base + WBSD_CSR);
1021
1022         mdelay(1);
1023
1024         csr = inb(host->base + WBSD_CSR);
1025         csr &= ~WBSD_MSLED;
1026         outb(csr, host->base + WBSD_CSR);
1027
1028         spin_unlock_bh(&host->lock);
1029
1030         return csr & WBSD_WRPT;
1031 }
1032
1033 static struct mmc_host_ops wbsd_ops = {
1034         .request        = wbsd_request,
1035         .set_ios        = wbsd_set_ios,
1036         .get_ro         = wbsd_get_ro,
1037 };
1038
1039 /*****************************************************************************\
1040  *                                                                           *
1041  * Interrupt handling                                                        *
1042  *                                                                           *
1043 \*****************************************************************************/
1044
1045 /*
1046  * Helper function to reset detection ignore
1047  */
1048
1049 static void wbsd_reset_ignore(unsigned long data)
1050 {
1051         struct wbsd_host *host = (struct wbsd_host *)data;
1052
1053         BUG_ON(host == NULL);
1054
1055         DBG("Resetting card detection ignore\n");
1056
1057         spin_lock_bh(&host->lock);
1058
1059         host->flags &= ~WBSD_FIGNORE_DETECT;
1060
1061         /*
1062          * Card status might have changed during the
1063          * blackout.
1064          */
1065         tasklet_schedule(&host->card_tasklet);
1066
1067         spin_unlock_bh(&host->lock);
1068 }
1069
1070 /*
1071  * Tasklets
1072  */
1073
1074 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
1075 {
1076         WARN_ON(!host->mrq);
1077         if (!host->mrq)
1078                 return NULL;
1079
1080         WARN_ON(!host->mrq->cmd);
1081         if (!host->mrq->cmd)
1082                 return NULL;
1083
1084         WARN_ON(!host->mrq->cmd->data);
1085         if (!host->mrq->cmd->data)
1086                 return NULL;
1087
1088         return host->mrq->cmd->data;
1089 }
1090
1091 static void wbsd_tasklet_card(unsigned long param)
1092 {
1093         struct wbsd_host *host = (struct wbsd_host *)param;
1094         u8 csr;
1095         int delay = -1;
1096
1097         spin_lock(&host->lock);
1098
1099         if (host->flags & WBSD_FIGNORE_DETECT) {
1100                 spin_unlock(&host->lock);
1101                 return;
1102         }
1103
1104         csr = inb(host->base + WBSD_CSR);
1105         WARN_ON(csr == 0xff);
1106
1107         if (csr & WBSD_CARDPRESENT) {
1108                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1109                         DBG("Card inserted\n");
1110                         host->flags |= WBSD_FCARD_PRESENT;
1111
1112                         delay = 500;
1113                 }
1114         } else if (host->flags & WBSD_FCARD_PRESENT) {
1115                 DBG("Card removed\n");
1116                 host->flags &= ~WBSD_FCARD_PRESENT;
1117
1118                 if (host->mrq) {
1119                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1120                                 mmc_hostname(host->mmc));
1121                         wbsd_reset(host);
1122
1123                         host->mrq->cmd->error = MMC_ERR_FAILED;
1124                         tasklet_schedule(&host->finish_tasklet);
1125                 }
1126
1127                 delay = 0;
1128         }
1129
1130         /*
1131          * Unlock first since we might get a call back.
1132          */
1133
1134         spin_unlock(&host->lock);
1135
1136         if (delay != -1)
1137                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1138 }
1139
1140 static void wbsd_tasklet_fifo(unsigned long param)
1141 {
1142         struct wbsd_host *host = (struct wbsd_host *)param;
1143         struct mmc_data *data;
1144
1145         spin_lock(&host->lock);
1146
1147         if (!host->mrq)
1148                 goto end;
1149
1150         data = wbsd_get_data(host);
1151         if (!data)
1152                 goto end;
1153
1154         if (data->flags & MMC_DATA_WRITE)
1155                 wbsd_fill_fifo(host);
1156         else
1157                 wbsd_empty_fifo(host);
1158
1159         /*
1160          * Done?
1161          */
1162         if (host->size == data->bytes_xfered) {
1163                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1164                 tasklet_schedule(&host->finish_tasklet);
1165         }
1166
1167 end:
1168         spin_unlock(&host->lock);
1169 }
1170
1171 static void wbsd_tasklet_crc(unsigned long param)
1172 {
1173         struct wbsd_host *host = (struct wbsd_host *)param;
1174         struct mmc_data *data;
1175
1176         spin_lock(&host->lock);
1177
1178         if (!host->mrq)
1179                 goto end;
1180
1181         data = wbsd_get_data(host);
1182         if (!data)
1183                 goto end;
1184
1185         DBGF("CRC error\n");
1186
1187         data->error = MMC_ERR_BADCRC;
1188
1189         tasklet_schedule(&host->finish_tasklet);
1190
1191 end:
1192         spin_unlock(&host->lock);
1193 }
1194
1195 static void wbsd_tasklet_timeout(unsigned long param)
1196 {
1197         struct wbsd_host *host = (struct wbsd_host *)param;
1198         struct mmc_data *data;
1199
1200         spin_lock(&host->lock);
1201
1202         if (!host->mrq)
1203                 goto end;
1204
1205         data = wbsd_get_data(host);
1206         if (!data)
1207                 goto end;
1208
1209         DBGF("Timeout\n");
1210
1211         data->error = MMC_ERR_TIMEOUT;
1212
1213         tasklet_schedule(&host->finish_tasklet);
1214
1215 end:
1216         spin_unlock(&host->lock);
1217 }
1218
1219 static void wbsd_tasklet_finish(unsigned long param)
1220 {
1221         struct wbsd_host *host = (struct wbsd_host *)param;
1222         struct mmc_data *data;
1223
1224         spin_lock(&host->lock);
1225
1226         WARN_ON(!host->mrq);
1227         if (!host->mrq)
1228                 goto end;
1229
1230         data = wbsd_get_data(host);
1231         if (!data)
1232                 goto end;
1233
1234         wbsd_finish_data(host, data);
1235
1236 end:
1237         spin_unlock(&host->lock);
1238 }
1239
1240 static void wbsd_tasklet_block(unsigned long param)
1241 {
1242         struct wbsd_host *host = (struct wbsd_host *)param;
1243         struct mmc_data *data;
1244
1245         spin_lock(&host->lock);
1246
1247         if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
1248                 WBSD_CRC_OK) {
1249                 data = wbsd_get_data(host);
1250                 if (!data)
1251                         goto end;
1252
1253                 DBGF("CRC error\n");
1254
1255                 data->error = MMC_ERR_BADCRC;
1256
1257                 tasklet_schedule(&host->finish_tasklet);
1258         }
1259
1260 end:
1261         spin_unlock(&host->lock);
1262 }
1263
1264 /*
1265  * Interrupt handling
1266  */
1267
1268 static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
1269 {
1270         struct wbsd_host *host = dev_id;
1271         int isr;
1272
1273         isr = inb(host->base + WBSD_ISR);
1274
1275         /*
1276          * Was it actually our hardware that caused the interrupt?
1277          */
1278         if (isr == 0xff || isr == 0x00)
1279                 return IRQ_NONE;
1280
1281         host->isr |= isr;
1282
1283         /*
1284          * Schedule tasklets as needed.
1285          */
1286         if (isr & WBSD_INT_CARD)
1287                 tasklet_schedule(&host->card_tasklet);
1288         if (isr & WBSD_INT_FIFO_THRE)
1289                 tasklet_schedule(&host->fifo_tasklet);
1290         if (isr & WBSD_INT_CRC)
1291                 tasklet_hi_schedule(&host->crc_tasklet);
1292         if (isr & WBSD_INT_TIMEOUT)
1293                 tasklet_hi_schedule(&host->timeout_tasklet);
1294         if (isr & WBSD_INT_BUSYEND)
1295                 tasklet_hi_schedule(&host->block_tasklet);
1296         if (isr & WBSD_INT_TC)
1297                 tasklet_schedule(&host->finish_tasklet);
1298
1299         return IRQ_HANDLED;
1300 }
1301
1302 /*****************************************************************************\
1303  *                                                                           *
1304  * Device initialisation and shutdown                                        *
1305  *                                                                           *
1306 \*****************************************************************************/
1307
1308 /*
1309  * Allocate/free MMC structure.
1310  */
1311
1312 static int __devinit wbsd_alloc_mmc(struct device *dev)
1313 {
1314         struct mmc_host *mmc;
1315         struct wbsd_host *host;
1316
1317         /*
1318          * Allocate MMC structure.
1319          */
1320         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1321         if (!mmc)
1322                 return -ENOMEM;
1323
1324         host = mmc_priv(mmc);
1325         host->mmc = mmc;
1326
1327         host->dma = -1;
1328
1329         /*
1330          * Set host parameters.
1331          */
1332         mmc->ops = &wbsd_ops;
1333         mmc->f_min = 375000;
1334         mmc->f_max = 24000000;
1335         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1336         mmc->caps = MMC_CAP_4_BIT_DATA;
1337
1338         spin_lock_init(&host->lock);
1339
1340         /*
1341          * Set up timers
1342          */
1343         init_timer(&host->ignore_timer);
1344         host->ignore_timer.data = (unsigned long)host;
1345         host->ignore_timer.function = wbsd_reset_ignore;
1346
1347         /*
1348          * Maximum number of segments. Worst case is one sector per segment
1349          * so this will be 64kB/512.
1350          */
1351         mmc->max_hw_segs = 128;
1352         mmc->max_phys_segs = 128;
1353
1354         /*
1355          * Maximum number of sectors in one transfer. Also limited by 64kB
1356          * buffer.
1357          */
1358         mmc->max_sectors = 128;
1359
1360         /*
1361          * Maximum segment size. Could be one segment with the maximum number
1362          * of segments.
1363          */
1364         mmc->max_seg_size = mmc->max_sectors * 512;
1365
1366         dev_set_drvdata(dev, mmc);
1367
1368         return 0;
1369 }
1370
1371 static void __devexit wbsd_free_mmc(struct device *dev)
1372 {
1373         struct mmc_host *mmc;
1374         struct wbsd_host *host;
1375
1376         mmc = dev_get_drvdata(dev);
1377         if (!mmc)
1378                 return;
1379
1380         host = mmc_priv(mmc);
1381         BUG_ON(host == NULL);
1382
1383         del_timer_sync(&host->ignore_timer);
1384
1385         mmc_free_host(mmc);
1386
1387         dev_set_drvdata(dev, NULL);
1388 }
1389
1390 /*
1391  * Scan for known chip id:s
1392  */
1393
1394 static int __devinit wbsd_scan(struct wbsd_host *host)
1395 {
1396         int i, j, k;
1397         int id;
1398
1399         /*
1400          * Iterate through all ports, all codes to
1401          * find hardware that is in our known list.
1402          */
1403         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1404                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1405                         continue;
1406
1407                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1408                         id = 0xFFFF;
1409
1410                         host->config = config_ports[i];
1411                         host->unlock_code = unlock_codes[j];
1412
1413                         wbsd_unlock_config(host);
1414
1415                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1416                         id = inb(config_ports[i] + 1) << 8;
1417
1418                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1419                         id |= inb(config_ports[i] + 1);
1420
1421                         wbsd_lock_config(host);
1422
1423                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1424                                 if (id == valid_ids[k]) {
1425                                         host->chip_id = id;
1426
1427                                         return 0;
1428                                 }
1429                         }
1430
1431                         if (id != 0xFFFF) {
1432                                 DBG("Unknown hardware (id %x) found at %x\n",
1433                                         id, config_ports[i]);
1434                         }
1435                 }
1436
1437                 release_region(config_ports[i], 2);
1438         }
1439
1440         host->config = 0;
1441         host->unlock_code = 0;
1442
1443         return -ENODEV;
1444 }
1445
1446 /*
1447  * Allocate/free io port ranges
1448  */
1449
1450 static int __devinit wbsd_request_region(struct wbsd_host *host, int base)
1451 {
1452         if (io & 0x7)
1453                 return -EINVAL;
1454
1455         if (!request_region(base, 8, DRIVER_NAME))
1456                 return -EIO;
1457
1458         host->base = io;
1459
1460         return 0;
1461 }
1462
1463 static void __devexit wbsd_release_regions(struct wbsd_host *host)
1464 {
1465         if (host->base)
1466                 release_region(host->base, 8);
1467
1468         host->base = 0;
1469
1470         if (host->config)
1471                 release_region(host->config, 2);
1472
1473         host->config = 0;
1474 }
1475
1476 /*
1477  * Allocate/free DMA port and buffer
1478  */
1479
1480 static void __devinit wbsd_request_dma(struct wbsd_host *host, int dma)
1481 {
1482         if (dma < 0)
1483                 return;
1484
1485         if (request_dma(dma, DRIVER_NAME))
1486                 goto err;
1487
1488         /*
1489          * We need to allocate a special buffer in
1490          * order for ISA to be able to DMA to it.
1491          */
1492         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1493                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1494         if (!host->dma_buffer)
1495                 goto free;
1496
1497         /*
1498          * Translate the address to a physical address.
1499          */
1500         host->dma_addr = dma_map_single(host->mmc->dev, host->dma_buffer,
1501                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1502
1503         /*
1504          * ISA DMA must be aligned on a 64k basis.
1505          */
1506         if ((host->dma_addr & 0xffff) != 0)
1507                 goto kfree;
1508         /*
1509          * ISA cannot access memory above 16 MB.
1510          */
1511         else if (host->dma_addr >= 0x1000000)
1512                 goto kfree;
1513
1514         host->dma = dma;
1515
1516         return;
1517
1518 kfree:
1519         /*
1520          * If we've gotten here then there is some kind of alignment bug
1521          */
1522         BUG_ON(1);
1523
1524         dma_unmap_single(host->mmc->dev, host->dma_addr,
1525                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1526         host->dma_addr = (dma_addr_t)NULL;
1527
1528         kfree(host->dma_buffer);
1529         host->dma_buffer = NULL;
1530
1531 free:
1532         free_dma(dma);
1533
1534 err:
1535         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1536                 "Falling back on FIFO.\n", dma);
1537 }
1538
1539 static void __devexit wbsd_release_dma(struct wbsd_host *host)
1540 {
1541         if (host->dma_addr) {
1542                 dma_unmap_single(host->mmc->dev, host->dma_addr,
1543                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1544         }
1545         kfree(host->dma_buffer);
1546         if (host->dma >= 0)
1547                 free_dma(host->dma);
1548
1549         host->dma = -1;
1550         host->dma_buffer = NULL;
1551         host->dma_addr = (dma_addr_t)NULL;
1552 }
1553
1554 /*
1555  * Allocate/free IRQ.
1556  */
1557
1558 static int __devinit wbsd_request_irq(struct wbsd_host *host, int irq)
1559 {
1560         int ret;
1561
1562         /*
1563          * Allocate interrupt.
1564          */
1565
1566         ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
1567         if (ret)
1568                 return ret;
1569
1570         host->irq = irq;
1571
1572         /*
1573          * Set up tasklets.
1574          */
1575         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1576                         (unsigned long)host);
1577         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1578                         (unsigned long)host);
1579         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1580                         (unsigned long)host);
1581         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1582                         (unsigned long)host);
1583         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1584                         (unsigned long)host);
1585         tasklet_init(&host->block_tasklet, wbsd_tasklet_block,
1586                         (unsigned long)host);
1587
1588         return 0;
1589 }
1590
1591 static void __devexit wbsd_release_irq(struct wbsd_host *host)
1592 {
1593         if (!host->irq)
1594                 return;
1595
1596         free_irq(host->irq, host);
1597
1598         host->irq = 0;
1599
1600         tasklet_kill(&host->card_tasklet);
1601         tasklet_kill(&host->fifo_tasklet);
1602         tasklet_kill(&host->crc_tasklet);
1603         tasklet_kill(&host->timeout_tasklet);
1604         tasklet_kill(&host->finish_tasklet);
1605         tasklet_kill(&host->block_tasklet);
1606 }
1607
1608 /*
1609  * Allocate all resources for the host.
1610  */
1611
1612 static int __devinit wbsd_request_resources(struct wbsd_host *host,
1613         int base, int irq, int dma)
1614 {
1615         int ret;
1616
1617         /*
1618          * Allocate I/O ports.
1619          */
1620         ret = wbsd_request_region(host, base);
1621         if (ret)
1622                 return ret;
1623
1624         /*
1625          * Allocate interrupt.
1626          */
1627         ret = wbsd_request_irq(host, irq);
1628         if (ret)
1629                 return ret;
1630
1631         /*
1632          * Allocate DMA.
1633          */
1634         wbsd_request_dma(host, dma);
1635
1636         return 0;
1637 }
1638
1639 /*
1640  * Release all resources for the host.
1641  */
1642
1643 static void __devexit wbsd_release_resources(struct wbsd_host *host)
1644 {
1645         wbsd_release_dma(host);
1646         wbsd_release_irq(host);
1647         wbsd_release_regions(host);
1648 }
1649
1650 /*
1651  * Configure the resources the chip should use.
1652  */
1653
1654 static void wbsd_chip_config(struct wbsd_host *host)
1655 {
1656         wbsd_unlock_config(host);
1657
1658         /*
1659          * Reset the chip.
1660          */
1661         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1662         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1663
1664         /*
1665          * Select SD/MMC function.
1666          */
1667         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1668
1669         /*
1670          * Set up card detection.
1671          */
1672         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1673
1674         /*
1675          * Configure chip
1676          */
1677         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1678         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1679
1680         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1681
1682         if (host->dma >= 0)
1683                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1684
1685         /*
1686          * Enable and power up chip.
1687          */
1688         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1689         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1690
1691         wbsd_lock_config(host);
1692 }
1693
1694 /*
1695  * Check that configured resources are correct.
1696  */
1697
1698 static int wbsd_chip_validate(struct wbsd_host *host)
1699 {
1700         int base, irq, dma;
1701
1702         wbsd_unlock_config(host);
1703
1704         /*
1705          * Select SD/MMC function.
1706          */
1707         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1708
1709         /*
1710          * Read configuration.
1711          */
1712         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1713         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1714
1715         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1716
1717         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1718
1719         wbsd_lock_config(host);
1720
1721         /*
1722          * Validate against given configuration.
1723          */
1724         if (base != host->base)
1725                 return 0;
1726         if (irq != host->irq)
1727                 return 0;
1728         if ((dma != host->dma) && (host->dma != -1))
1729                 return 0;
1730
1731         return 1;
1732 }
1733
1734 /*
1735  * Powers down the SD function
1736  */
1737
1738 static void wbsd_chip_poweroff(struct wbsd_host *host)
1739 {
1740         wbsd_unlock_config(host);
1741
1742         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1743         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1744
1745         wbsd_lock_config(host);
1746 }
1747
1748 /*****************************************************************************\
1749  *                                                                           *
1750  * Devices setup and shutdown                                                *
1751  *                                                                           *
1752 \*****************************************************************************/
1753
1754 static int __devinit wbsd_init(struct device *dev, int base, int irq, int dma,
1755         int pnp)
1756 {
1757         struct wbsd_host *host = NULL;
1758         struct mmc_host *mmc = NULL;
1759         int ret;
1760
1761         ret = wbsd_alloc_mmc(dev);
1762         if (ret)
1763                 return ret;
1764
1765         mmc = dev_get_drvdata(dev);
1766         host = mmc_priv(mmc);
1767
1768         /*
1769          * Scan for hardware.
1770          */
1771         ret = wbsd_scan(host);
1772         if (ret) {
1773                 if (pnp && (ret == -ENODEV)) {
1774                         printk(KERN_WARNING DRIVER_NAME
1775                                 ": Unable to confirm device presence. You may "
1776                                 "experience lock-ups.\n");
1777                 } else {
1778                         wbsd_free_mmc(dev);
1779                         return ret;
1780                 }
1781         }
1782
1783         /*
1784          * Request resources.
1785          */
1786         ret = wbsd_request_resources(host, io, irq, dma);
1787         if (ret) {
1788                 wbsd_release_resources(host);
1789                 wbsd_free_mmc(dev);
1790                 return ret;
1791         }
1792
1793         /*
1794          * See if chip needs to be configured.
1795          */
1796         if (pnp) {
1797                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1798                         printk(KERN_WARNING DRIVER_NAME
1799                                 ": PnP active but chip not configured! "
1800                                 "You probably have a buggy BIOS. "
1801                                 "Configuring chip manually.\n");
1802                         wbsd_chip_config(host);
1803                 }
1804         } else
1805                 wbsd_chip_config(host);
1806
1807         /*
1808          * Power Management stuff. No idea how this works.
1809          * Not tested.
1810          */
1811 #ifdef CONFIG_PM
1812         if (host->config) {
1813                 wbsd_unlock_config(host);
1814                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1815                 wbsd_lock_config(host);
1816         }
1817 #endif
1818         /*
1819          * Allow device to initialise itself properly.
1820          */
1821         mdelay(5);
1822
1823         /*
1824          * Reset the chip into a known state.
1825          */
1826         wbsd_init_device(host);
1827
1828         mmc_add_host(mmc);
1829
1830         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1831         if (host->chip_id != 0)
1832                 printk(" id %x", (int)host->chip_id);
1833         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1834         if (host->dma >= 0)
1835                 printk(" dma %d", (int)host->dma);
1836         else
1837                 printk(" FIFO");
1838         if (pnp)
1839                 printk(" PnP");
1840         printk("\n");
1841
1842         return 0;
1843 }
1844
1845 static void __devexit wbsd_shutdown(struct device *dev, int pnp)
1846 {
1847         struct mmc_host *mmc = dev_get_drvdata(dev);
1848         struct wbsd_host *host;
1849
1850         if (!mmc)
1851                 return;
1852
1853         host = mmc_priv(mmc);
1854
1855         mmc_remove_host(mmc);
1856
1857         /*
1858          * Power down the SD/MMC function.
1859          */
1860         if (!pnp)
1861                 wbsd_chip_poweroff(host);
1862
1863         wbsd_release_resources(host);
1864
1865         wbsd_free_mmc(dev);
1866 }
1867
1868 /*
1869  * Non-PnP
1870  */
1871
1872 static int __devinit wbsd_probe(struct platform_device *dev)
1873 {
1874         return wbsd_init(&dev->dev, io, irq, dma, 0);
1875 }
1876
1877 static int __devexit wbsd_remove(struct platform_device *dev)
1878 {
1879         wbsd_shutdown(&dev->dev, 0);
1880
1881         return 0;
1882 }
1883
1884 /*
1885  * PnP
1886  */
1887
1888 #ifdef CONFIG_PNP
1889
1890 static int __devinit
1891 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1892 {
1893         int io, irq, dma;
1894
1895         /*
1896          * Get resources from PnP layer.
1897          */
1898         io = pnp_port_start(pnpdev, 0);
1899         irq = pnp_irq(pnpdev, 0);
1900         if (pnp_dma_valid(pnpdev, 0))
1901                 dma = pnp_dma(pnpdev, 0);
1902         else
1903                 dma = -1;
1904
1905         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1906
1907         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1908 }
1909
1910 static void __devexit wbsd_pnp_remove(struct pnp_dev *dev)
1911 {
1912         wbsd_shutdown(&dev->dev, 1);
1913 }
1914
1915 #endif /* CONFIG_PNP */
1916
1917 /*
1918  * Power management
1919  */
1920
1921 #ifdef CONFIG_PM
1922
1923 static int wbsd_suspend(struct wbsd_host *host, pm_message_t state)
1924 {
1925         BUG_ON(host == NULL);
1926
1927         return mmc_suspend_host(host->mmc, state);
1928 }
1929
1930 static int wbsd_resume(struct wbsd_host *host)
1931 {
1932         BUG_ON(host == NULL);
1933
1934         wbsd_init_device(host);
1935
1936         return mmc_resume_host(host->mmc);
1937 }
1938
1939 static int wbsd_platform_suspend(struct platform_device *dev,
1940                                  pm_message_t state)
1941 {
1942         struct mmc_host *mmc = platform_get_drvdata(dev);
1943         struct wbsd_host *host;
1944         int ret;
1945
1946         if (mmc == NULL)
1947                 return 0;
1948
1949         DBGF("Suspending...\n");
1950
1951         host = mmc_priv(mmc);
1952
1953         ret = wbsd_suspend(host, state);
1954         if (ret)
1955                 return ret;
1956
1957         wbsd_chip_poweroff(host);
1958
1959         return 0;
1960 }
1961
1962 static int wbsd_platform_resume(struct platform_device *dev)
1963 {
1964         struct mmc_host *mmc = platform_get_drvdata(dev);
1965         struct wbsd_host *host;
1966
1967         if (mmc == NULL)
1968                 return 0;
1969
1970         DBGF("Resuming...\n");
1971
1972         host = mmc_priv(mmc);
1973
1974         wbsd_chip_config(host);
1975
1976         /*
1977          * Allow device to initialise itself properly.
1978          */
1979         mdelay(5);
1980
1981         return wbsd_resume(host);
1982 }
1983
1984 #ifdef CONFIG_PNP
1985
1986 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1987 {
1988         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1989         struct wbsd_host *host;
1990
1991         if (mmc == NULL)
1992                 return 0;
1993
1994         DBGF("Suspending...\n");
1995
1996         host = mmc_priv(mmc);
1997
1998         return wbsd_suspend(host, state);
1999 }
2000
2001 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
2002 {
2003         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
2004         struct wbsd_host *host;
2005
2006         if (mmc == NULL)
2007                 return 0;
2008
2009         DBGF("Resuming...\n");
2010
2011         host = mmc_priv(mmc);
2012
2013         /*
2014          * See if chip needs to be configured.
2015          */
2016         if (host->config != 0) {
2017                 if (!wbsd_chip_validate(host)) {
2018                         printk(KERN_WARNING DRIVER_NAME
2019                                 ": PnP active but chip not configured! "
2020                                 "You probably have a buggy BIOS. "
2021                                 "Configuring chip manually.\n");
2022                         wbsd_chip_config(host);
2023                 }
2024         }
2025
2026         /*
2027          * Allow device to initialise itself properly.
2028          */
2029         mdelay(5);
2030
2031         return wbsd_resume(host);
2032 }
2033
2034 #endif /* CONFIG_PNP */
2035
2036 #else /* CONFIG_PM */
2037
2038 #define wbsd_platform_suspend NULL
2039 #define wbsd_platform_resume NULL
2040
2041 #define wbsd_pnp_suspend NULL
2042 #define wbsd_pnp_resume NULL
2043
2044 #endif /* CONFIG_PM */
2045
2046 static struct platform_device *wbsd_device;
2047
2048 static struct platform_driver wbsd_driver = {
2049         .probe          = wbsd_probe,
2050         .remove         = __devexit_p(wbsd_remove),
2051
2052         .suspend        = wbsd_platform_suspend,
2053         .resume         = wbsd_platform_resume,
2054         .driver         = {
2055                 .name   = DRIVER_NAME,
2056         },
2057 };
2058
2059 #ifdef CONFIG_PNP
2060
2061 static struct pnp_driver wbsd_pnp_driver = {
2062         .name           = DRIVER_NAME,
2063         .id_table       = pnp_dev_table,
2064         .probe          = wbsd_pnp_probe,
2065         .remove         = __devexit_p(wbsd_pnp_remove),
2066
2067         .suspend        = wbsd_pnp_suspend,
2068         .resume         = wbsd_pnp_resume,
2069 };
2070
2071 #endif /* CONFIG_PNP */
2072
2073 /*
2074  * Module loading/unloading
2075  */
2076
2077 static int __init wbsd_drv_init(void)
2078 {
2079         int result;
2080
2081         printk(KERN_INFO DRIVER_NAME
2082                 ": Winbond W83L51xD SD/MMC card interface driver, "
2083                 DRIVER_VERSION "\n");
2084         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2085
2086 #ifdef CONFIG_PNP
2087
2088         if (!nopnp) {
2089                 result = pnp_register_driver(&wbsd_pnp_driver);
2090                 if (result < 0)
2091                         return result;
2092         }
2093 #endif /* CONFIG_PNP */
2094
2095         if (nopnp) {
2096                 result = platform_driver_register(&wbsd_driver);
2097                 if (result < 0)
2098                         return result;
2099
2100                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
2101                 if (!wbsd_device) {
2102                         platform_driver_unregister(&wbsd_driver);
2103                         return -ENOMEM;
2104                 }
2105
2106                 result = platform_device_add(wbsd_device);
2107                 if (result) {
2108                         platform_device_put(wbsd_device);
2109                         platform_driver_unregister(&wbsd_driver);
2110                         return result;
2111                 }
2112         }
2113
2114         return 0;
2115 }
2116
2117 static void __exit wbsd_drv_exit(void)
2118 {
2119 #ifdef CONFIG_PNP
2120
2121         if (!nopnp)
2122                 pnp_unregister_driver(&wbsd_pnp_driver);
2123
2124 #endif /* CONFIG_PNP */
2125
2126         if (nopnp) {
2127                 platform_device_unregister(wbsd_device);
2128
2129                 platform_driver_unregister(&wbsd_driver);
2130         }
2131
2132         DBG("unloaded\n");
2133 }
2134
2135 module_init(wbsd_drv_init);
2136 module_exit(wbsd_drv_exit);
2137 #ifdef CONFIG_PNP
2138 module_param(nopnp, uint, 0444);
2139 #endif
2140 module_param(io, uint, 0444);
2141 module_param(irq, uint, 0444);
2142 module_param(dma, int, 0444);
2143
2144 MODULE_LICENSE("GPL");
2145 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
2146 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2147 MODULE_VERSION(DRIVER_VERSION);
2148
2149 #ifdef CONFIG_PNP
2150 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2151 #endif
2152 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2153 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2154 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");