drivers/mmc/host/wbsd.c

   1 /*
   2  *  linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
   3  *
   4  *  Copyright (C) 2004-2007 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 as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  *
  12  * Warning!
  13  *
  14  * Changes to the FIFO system should be done with extreme care since
  15  * the hardware is full of bugs related to the FIFO. Known issues are:
  16  *
  17  * - FIFO size field in FSR is always zero.
  18  *
  19  * - FIFO interrupts tend not to work as they should. Interrupts are
  20  *   triggered only for full/empty events, not for threshold values.
  21  *
  22  * - On APIC systems the FIFO empty interrupt is sometimes lost.
  23  */
  24
  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/scatterlist.h>
  37 #include <linux/slab.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/dma.h>
  41
  42 #include "wbsd.h"
  43
  44 #define DRIVER_NAME "wbsd"
  45
  46 #define DBG(x...) \
  47         pr_debug(DRIVER_NAME ": " x)
  48 #define DBGF(f, x...) \
  49         pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
  50
  51 /*
  52  * Device resources
  53  */
  54
  55 #ifdef CONFIG_PNP
  56
  57 static const struct pnp_device_id pnp_dev_table[] = {
  58         { "WEC0517", 0 },
  59         { "WEC0518", 0 },
  60         { "", 0 },
  61 };
  62
  63 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
  64
  65 #endif /* CONFIG_PNP */
  66
  67 static const int config_ports[] = { 0x2E, 0x4E };
  68 static const int unlock_codes[] = { 0x83, 0x87 };
  69
  70 static const int valid_ids[] = {
  71         0x7112,
  72 };
  73
  74 #ifdef CONFIG_PNP
  75 static unsigned int param_nopnp = 0;
  76 #else
  77 static const unsigned int param_nopnp = 1;
  78 #endif
  79 static unsigned int param_io = 0x248;
  80 static unsigned int param_irq = 6;
  81 static int param_dma = 2;
  82
  83 /*
  84  * Basic functions
  85  */
  86
  87 static inline void wbsd_unlock_config(struct wbsd_host *host)
  88 {
  89         BUG_ON(host->config == 0);
  90
  91         outb(host->unlock_code, host->config);
  92         outb(host->unlock_code, host->config);
  93 }
  94
  95 static inline void wbsd_lock_config(struct wbsd_host *host)
  96 {
  97         BUG_ON(host->config == 0);
  98
  99         outb(LOCK_CODE, host->config);
 100 }
 101
 102 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
 103 {
 104         BUG_ON(host->config == 0);
 105
 106         outb(reg, host->config);
 107         outb(value, host->config + 1);
 108 }
 109
 110 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
 111 {
 112         BUG_ON(host->config == 0);
 113
 114         outb(reg, host->config);
 115         return inb(host->config + 1);
 116 }
 117
 118 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
 119 {
 120         outb(index, host->base + WBSD_IDXR);
 121         outb(value, host->base + WBSD_DATAR);
 122 }
 123
 124 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
 125 {
 126         outb(index, host->base + WBSD_IDXR);
 127         return inb(host->base + WBSD_DATAR);
 128 }
 129
 130 /*
 131  * Common routines
 132  */
 133
 134 static void wbsd_init_device(struct wbsd_host *host)
 135 {
 136         u8 setup, ier;
 137
 138         /*
 139          * Reset chip (SD/MMC part) and fifo.
 140          */
 141         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 142         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
 143         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 144
 145         /*
 146          * Set DAT3 to input
 147          */
 148         setup &= ~WBSD_DAT3_H;
 149         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 150         host->flags &= ~WBSD_FIGNORE_DETECT;
 151
 152         /*
 153          * Read back default clock.
 154          */
 155         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
 156
 157         /*
 158          * Power down port.
 159          */
 160         outb(WBSD_POWER_N, host->base + WBSD_CSR);
 161
 162         /*
 163          * Set maximum timeout.
 164          */
 165         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
 166
 167         /*
 168          * Test for card presence
 169          */
 170         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
 171                 host->flags |= WBSD_FCARD_PRESENT;
 172         else
 173                 host->flags &= ~WBSD_FCARD_PRESENT;
 174
 175         /*
 176          * Enable interesting interrupts.
 177          */
 178         ier = 0;
 179         ier |= WBSD_EINT_CARD;
 180         ier |= WBSD_EINT_FIFO_THRE;
 181         ier |= WBSD_EINT_CRC;
 182         ier |= WBSD_EINT_TIMEOUT;
 183         ier |= WBSD_EINT_TC;
 184
 185         outb(ier, host->base + WBSD_EIR);
 186
 187         /*
 188          * Clear interrupts.
 189          */
 190         inb(host->base + WBSD_ISR);
 191 }
 192
 193 static void wbsd_reset(struct wbsd_host *host)
 194 {
 195         u8 setup;
 196
 197         pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc));
 198
 199         /*
 200          * Soft reset of chip (SD/MMC part).
 201          */
 202         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 203         setup |= WBSD_SOFT_RESET;
 204         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 205 }
 206
 207 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
 208 {
 209         unsigned long dmaflags;
 210
 211         if (host->dma >= 0) {
 212                 /*
 213                  * Release ISA DMA controller.
 214                  */
 215                 dmaflags = claim_dma_lock();
 216                 disable_dma(host->dma);
 217                 clear_dma_ff(host->dma);
 218                 release_dma_lock(dmaflags);
 219
 220                 /*
 221                  * Disable DMA on host.
 222                  */
 223                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 224         }
 225
 226         host->mrq = NULL;
 227
 228         /*
 229          * MMC layer might call back into the driver so first unlock.
 230          */
 231         spin_unlock(&host->lock);
 232         mmc_request_done(host->mmc, mrq);
 233         spin_lock(&host->lock);
 234 }
 235
 236 /*
 237  * Scatter/gather functions
 238  */
 239
 240 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
 241 {
 242         /*
 243          * Get info. about SG list from data structure.
 244          */
 245         host->cur_sg = data->sg;
 246         host->num_sg = data->sg_len;
 247
 248         host->offset = 0;
 249         host->remain = host->cur_sg->length;
 250 }
 251
 252 static inline int wbsd_next_sg(struct wbsd_host *host)
 253 {
 254         /*
 255          * Skip to next SG entry.
 256          */
 257         host->cur_sg++;
 258         host->num_sg--;
 259
 260         /*
 261          * Any entries left?
 262          */
 263         if (host->num_sg > 0) {
 264                 host->offset = 0;
 265                 host->remain = host->cur_sg->length;
 266         }
 267
 268         return host->num_sg;
 269 }
 270
 271 static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
 272 {
 273         return sg_virt(host->cur_sg);
 274 }
 275
 276 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
 277 {
 278         unsigned int len, i;
 279         struct scatterlist *sg;
 280         char *dmabuf = host->dma_buffer;
 281         char *sgbuf;
 282
 283         sg = data->sg;
 284         len = data->sg_len;
 285
 286         for (i = 0; i < len; i++) {
 287                 sgbuf = sg_virt(&sg[i]);
 288                 memcpy(dmabuf, sgbuf, sg[i].length);
 289                 dmabuf += sg[i].length;
 290         }
 291 }
 292
 293 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
 294 {
 295         unsigned int len, i;
 296         struct scatterlist *sg;
 297         char *dmabuf = host->dma_buffer;
 298         char *sgbuf;
 299
 300         sg = data->sg;
 301         len = data->sg_len;
 302
 303         for (i = 0; i < len; i++) {
 304                 sgbuf = sg_virt(&sg[i]);
 305                 memcpy(sgbuf, dmabuf, sg[i].length);
 306                 dmabuf += sg[i].length;
 307         }
 308 }
 309
 310 /*
 311  * Command handling
 312  */
 313
 314 static inline void wbsd_get_short_reply(struct wbsd_host *host,
 315                                         struct mmc_command *cmd)
 316 {
 317         /*
 318          * Correct response type?
 319          */
 320         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
 321                 cmd->error = -EILSEQ;
 322                 return;
 323         }
 324
 325         cmd->resp[0]  = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
 326         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
 327         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
 328         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
 329         cmd->resp[1]  = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
 330 }
 331
 332 static inline void wbsd_get_long_reply(struct wbsd_host *host,
 333         struct mmc_command *cmd)
 334 {
 335         int i;
 336
 337         /*
 338          * Correct response type?
 339          */
 340         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
 341                 cmd->error = -EILSEQ;
 342                 return;
 343         }
 344
 345         for (i = 0; i < 4; i++) {
 346                 cmd->resp[i] =
 347                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
 348                 cmd->resp[i] |=
 349                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
 350                 cmd->resp[i] |=
 351                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
 352                 cmd->resp[i] |=
 353                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
 354         }
 355 }
 356
 357 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
 358 {
 359         int i;
 360         u8 status, isr;
 361
 362         /*
 363          * Clear accumulated ISR. The interrupt routine
 364          * will fill this one with events that occur during
 365          * transfer.
 366          */
 367         host->isr = 0;
 368
 369         /*
 370          * Send the command (CRC calculated by host).
 371          */
 372         outb(cmd->opcode, host->base + WBSD_CMDR);
 373         for (i = 3; i >= 0; i--)
 374                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
 375
 376         cmd->error = 0;
 377
 378         /*
 379          * Wait for the request to complete.
 380          */
 381         do {
 382                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 383         } while (status & WBSD_CARDTRAFFIC);
 384
 385         /*
 386          * Do we expect a reply?
 387          */
 388         if (cmd->flags & MMC_RSP_PRESENT) {
 389                 /*
 390                  * Read back status.
 391                  */
 392                 isr = host->isr;
 393
 394                 /* Card removed? */
 395                 if (isr & WBSD_INT_CARD)
 396                         cmd->error = -ENOMEDIUM;
 397                 /* Timeout? */
 398                 else if (isr & WBSD_INT_TIMEOUT)
 399                         cmd->error = -ETIMEDOUT;
 400                 /* CRC? */
 401                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 402                         cmd->error = -EILSEQ;
 403                 /* All ok */
 404                 else {
 405                         if (cmd->flags & MMC_RSP_136)
 406                                 wbsd_get_long_reply(host, cmd);
 407                         else
 408                                 wbsd_get_short_reply(host, cmd);
 409                 }
 410         }
 411 }
 412
 413 /*
 414  * Data functions
 415  */
 416
 417 static void wbsd_empty_fifo(struct wbsd_host *host)
 418 {
 419         struct mmc_data *data = host->mrq->cmd->data;
 420         char *buffer;
 421         int i, fsr, fifo;
 422
 423         /*
 424          * Handle excessive data.
 425          */
 426         if (host->num_sg == 0)
 427                 return;
 428
 429         buffer = wbsd_sg_to_buffer(host) + host->offset;
 430
 431         /*
 432          * Drain the fifo. This has a tendency to loop longer
 433          * than the FIFO length (usually one block).
 434          */
 435         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
 436                 /*
 437                  * The size field in the FSR is broken so we have to
 438                  * do some guessing.
 439                  */
 440                 if (fsr & WBSD_FIFO_FULL)
 441                         fifo = 16;
 442                 else if (fsr & WBSD_FIFO_FUTHRE)
 443                         fifo = 8;
 444                 else
 445                         fifo = 1;
 446
 447                 for (i = 0; i < fifo; i++) {
 448                         *buffer = inb(host->base + WBSD_DFR);
 449                         buffer++;
 450                         host->offset++;
 451                         host->remain--;
 452
 453                         data->bytes_xfered++;
 454
 455                         /*
 456                          * End of scatter list entry?
 457                          */
 458                         if (host->remain == 0) {
 459                                 /*
 460                                  * Get next entry. Check if last.
 461                                  */
 462                                 if (!wbsd_next_sg(host))
 463                                         return;
 464
 465                                 buffer = wbsd_sg_to_buffer(host);
 466                         }
 467                 }
 468         }
 469
 470         /*
 471          * This is a very dirty hack to solve a
 472          * hardware problem. The chip doesn't trigger
 473          * FIFO threshold interrupts properly.
 474          */
 475         if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
 476                 tasklet_schedule(&host->fifo_tasklet);
 477 }
 478
 479 static void wbsd_fill_fifo(struct wbsd_host *host)
 480 {
 481         struct mmc_data *data = host->mrq->cmd->data;
 482         char *buffer;
 483         int i, fsr, fifo;
 484
 485         /*
 486          * Check that we aren't being called after the
 487          * entire buffer has been transferred.
 488          */
 489         if (host->num_sg == 0)
 490                 return;
 491
 492         buffer = wbsd_sg_to_buffer(host) + host->offset;
 493
 494         /*
 495          * Fill the fifo. This has a tendency to loop longer
 496          * than the FIFO length (usually one block).
 497          */
 498         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
 499                 /*
 500                  * The size field in the FSR is broken so we have to
 501                  * do some guessing.
 502                  */
 503                 if (fsr & WBSD_FIFO_EMPTY)
 504                         fifo = 0;
 505                 else if (fsr & WBSD_FIFO_EMTHRE)
 506                         fifo = 8;
 507                 else
 508                         fifo = 15;
 509
 510                 for (i = 16; i > fifo; i--) {
 511                         outb(*buffer, host->base + WBSD_DFR);
 512                         buffer++;
 513                         host->offset++;
 514                         host->remain--;
 515
 516                         data->bytes_xfered++;
 517
 518                         /*
 519                          * End of scatter list entry?
 520                          */
 521                         if (host->remain == 0) {
 522                                 /*
 523                                  * Get next entry. Check if last.
 524                                  */
 525                                 if (!wbsd_next_sg(host))
 526                                         return;
 527
 528                                 buffer = wbsd_sg_to_buffer(host);
 529                         }
 530                 }
 531         }
 532
 533         /*
 534          * The controller stops sending interrupts for
 535          * 'FIFO empty' under certain conditions. So we
 536          * need to be a bit more pro-active.
 537          */
 538         tasklet_schedule(&host->fifo_tasklet);
 539 }
 540
 541 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
 542 {
 543         u16 blksize;
 544         u8 setup;
 545         unsigned long dmaflags;
 546         unsigned int size;
 547
 548         /*
 549          * Calculate size.
 550          */
 551         size = data->blocks * data->blksz;
 552
 553         /*
 554          * Check timeout values for overflow.
 555          * (Yes, some cards cause this value to overflow).
 556          */
 557         if (data->timeout_ns > 127000000)
 558                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
 559         else {
 560                 wbsd_write_index(host, WBSD_IDX_TAAC,
 561                         data->timeout_ns / 1000000);
 562         }
 563
 564         if (data->timeout_clks > 255)
 565                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
 566         else
 567                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
 568
 569         /*
 570          * Inform the chip of how large blocks will be
 571          * sent. It needs this to determine when to
 572          * calculate CRC.
 573          *
 574          * Space for CRC must be included in the size.
 575          * Two bytes are needed for each data line.
 576          */
 577         if (host->bus_width == MMC_BUS_WIDTH_1) {
 578                 blksize = data->blksz + 2;
 579
 580                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 581                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 582         } else if (host->bus_width == MMC_BUS_WIDTH_4) {
 583                 blksize = data->blksz + 2 * 4;
 584
 585                 wbsd_write_index(host, WBSD_IDX_PBSMSB,
 586                         ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
 587                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 588         } else {
 589                 data->error = -EINVAL;
 590                 return;
 591         }
 592
 593         /*
 594          * Clear the FIFO. This is needed even for DMA
 595          * transfers since the chip still uses the FIFO
 596          * internally.
 597          */
 598         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 599         setup |= WBSD_FIFO_RESET;
 600         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 601
 602         /*
 603          * DMA transfer?
 604          */
 605         if (host->dma >= 0) {
 606                 /*
 607                  * The buffer for DMA is only 64 kB.
 608                  */
 609                 BUG_ON(size > 0x10000);
 610                 if (size > 0x10000) {
 611                         data->error = -EINVAL;
 612                         return;
 613                 }
 614
 615                 /*
 616                  * Transfer data from the SG list to
 617                  * the DMA buffer.
 618                  */
 619                 if (data->flags & MMC_DATA_WRITE)
 620                         wbsd_sg_to_dma(host, data);
 621
 622                 /*
 623                  * Initialise the ISA DMA controller.
 624                  */
 625                 dmaflags = claim_dma_lock();
 626                 disable_dma(host->dma);
 627                 clear_dma_ff(host->dma);
 628                 if (data->flags & MMC_DATA_READ)
 629                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 630                 else
 631                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 632                 set_dma_addr(host->dma, host->dma_addr);
 633                 set_dma_count(host->dma, size);
 634
 635                 enable_dma(host->dma);
 636                 release_dma_lock(dmaflags);
 637
 638                 /*
 639                  * Enable DMA on the host.
 640                  */
 641                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 642         } else {
 643                 /*
 644                  * This flag is used to keep printk
 645                  * output to a minimum.
 646                  */
 647                 host->firsterr = 1;
 648
 649                 /*
 650                  * Initialise the SG list.
 651                  */
 652                 wbsd_init_sg(host, data);
 653
 654                 /*
 655                  * Turn off DMA.
 656                  */
 657                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 658
 659                 /*
 660                  * Set up FIFO threshold levels (and fill
 661                  * buffer if doing a write).
 662                  */
 663                 if (data->flags & MMC_DATA_READ) {
 664                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 665                                 WBSD_FIFOEN_FULL | 8);
 666                 } else {
 667                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 668                                 WBSD_FIFOEN_EMPTY | 8);
 669                         wbsd_fill_fifo(host);
 670                 }
 671         }
 672
 673         data->error = 0;
 674 }
 675
 676 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
 677 {
 678         unsigned long dmaflags;
 679         int count;
 680         u8 status;
 681
 682         WARN_ON(host->mrq == NULL);
 683
 684         /*
 685          * Send a stop command if needed.
 686          */
 687         if (data->stop)
 688                 wbsd_send_command(host, data->stop);
 689
 690         /*
 691          * Wait for the controller to leave data
 692          * transfer state.
 693          */
 694         do {
 695                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 696         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 697
 698         /*
 699          * DMA transfer?
 700          */
 701         if (host->dma >= 0) {
 702                 /*
 703                  * Disable DMA on the host.
 704                  */
 705                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 706
 707                 /*
 708                  * Turn of ISA DMA controller.
 709                  */
 710                 dmaflags = claim_dma_lock();
 711                 disable_dma(host->dma);
 712                 clear_dma_ff(host->dma);
 713                 count = get_dma_residue(host->dma);
 714                 release_dma_lock(dmaflags);
 715
 716                 data->bytes_xfered = host->mrq->data->blocks *
 717                         host->mrq->data->blksz - count;
 718                 data->bytes_xfered -= data->bytes_xfered % data->blksz;
 719
 720                 /*
 721                  * Any leftover data?
 722                  */
 723                 if (count) {
 724                         pr_err("%s: Incomplete DMA transfer. "
 725                                 "%d bytes left.\n",
 726                                 mmc_hostname(host->mmc), count);
 727
 728                         if (!data->error)
 729                                 data->error = -EIO;
 730                 } else {
 731                         /*
 732                          * Transfer data from DMA buffer to
 733                          * SG list.
 734                          */
 735                         if (data->flags & MMC_DATA_READ)
 736                                 wbsd_dma_to_sg(host, data);
 737                 }
 738
 739                 if (data->error) {
 740                         if (data->bytes_xfered)
 741                                 data->bytes_xfered -= data->blksz;
 742                 }
 743         }
 744
 745         wbsd_request_end(host, host->mrq);
 746 }
 747
 748 /*****************************************************************************\
 749  *                                                                           *
 750  * MMC layer callbacks                                                       *
 751  *                                                                           *
 752 \*****************************************************************************/
 753
 754 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 755 {
 756         struct wbsd_host *host = mmc_priv(mmc);
 757         struct mmc_command *cmd;
 758
 759         /*
 760          * Disable tasklets to avoid a deadlock.
 761          */
 762         spin_lock_bh(&host->lock);
 763
 764         BUG_ON(host->mrq != NULL);
 765
 766         cmd = mrq->cmd;
 767
 768         host->mrq = mrq;
 769
 770         /*
 771          * Check that there is actually a card in the slot.
 772          */
 773         if (!(host->flags & WBSD_FCARD_PRESENT)) {
 774                 cmd->error = -ENOMEDIUM;
 775                 goto done;
 776         }
 777
 778         if (cmd->data) {
 779                 /*
 780                  * The hardware is so delightfully stupid that it has a list
 781                  * of "data" commands. If a command isn't on this list, it'll
 782                  * just go back to the idle state and won't send any data
 783                  * interrupts.
 784                  */
 785                 switch (cmd->opcode) {
 786                 case 11:
 787                 case 17:
 788                 case 18:
 789                 case 20:
 790                 case 24:
 791                 case 25:
 792                 case 26:
 793                 case 27:
 794                 case 30:
 795                 case 42:
 796                 case 56:
 797                         break;
 798
 799                 /* ACMDs. We don't keep track of state, so we just treat them
 800                  * like any other command. */
 801                 case 51:
 802                         break;
 803
 804                 default:
 805 #ifdef CONFIG_MMC_DEBUG
 806                         pr_warn("%s: Data command %d is not supported by this controller\n",
 807                                 mmc_hostname(host->mmc), cmd->opcode);
 808 #endif
 809                         cmd->error = -EINVAL;
 810
 811                         goto done;
 812                 }
 813         }
 814
 815         /*
 816          * Does the request include data?
 817          */
 818         if (cmd->data) {
 819                 wbsd_prepare_data(host, cmd->data);
 820
 821                 if (cmd->data->error)
 822                         goto done;
 823         }
 824
 825         wbsd_send_command(host, cmd);
 826
 827         /*
 828          * If this is a data transfer the request
 829          * will be finished after the data has
 830          * transferred.
 831          */
 832         if (cmd->data && !cmd->error) {
 833                 /*
 834                  * Dirty fix for hardware bug.
 835                  */
 836                 if (host->dma == -1)
 837                         tasklet_schedule(&host->fifo_tasklet);
 838
 839                 spin_unlock_bh(&host->lock);
 840
 841                 return;
 842         }
 843
 844 done:
 845         wbsd_request_end(host, mrq);
 846
 847         spin_unlock_bh(&host->lock);
 848 }
 849
 850 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 851 {
 852         struct wbsd_host *host = mmc_priv(mmc);
 853         u8 clk, setup, pwr;
 854
 855         spin_lock_bh(&host->lock);
 856
 857         /*
 858          * Reset the chip on each power off.
 859          * Should clear out any weird states.
 860          */
 861         if (ios->power_mode == MMC_POWER_OFF)
 862                 wbsd_init_device(host);
 863
 864         if (ios->clock >= 24000000)
 865                 clk = WBSD_CLK_24M;
 866         else if (ios->clock >= 16000000)
 867                 clk = WBSD_CLK_16M;
 868         else if (ios->clock >= 12000000)
 869                 clk = WBSD_CLK_12M;
 870         else
 871                 clk = WBSD_CLK_375K;
 872
 873         /*
 874          * Only write to the clock register when
 875          * there is an actual change.
 876          */
 877         if (clk != host->clk) {
 878                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
 879                 host->clk = clk;
 880         }
 881
 882         /*
 883          * Power up card.
 884          */
 885         if (ios->power_mode != MMC_POWER_OFF) {
 886                 pwr = inb(host->base + WBSD_CSR);
 887                 pwr &= ~WBSD_POWER_N;
 888                 outb(pwr, host->base + WBSD_CSR);
 889         }
 890
 891         /*
 892          * MMC cards need to have pin 1 high during init.
 893          * It wreaks havoc with the card detection though so
 894          * that needs to be disabled.
 895          */
 896         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 897         if (ios->chip_select == MMC_CS_HIGH) {
 898                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
 899                 setup |= WBSD_DAT3_H;
 900                 host->flags |= WBSD_FIGNORE_DETECT;
 901         } else {
 902                 if (setup & WBSD_DAT3_H) {
 903                         setup &= ~WBSD_DAT3_H;
 904
 905                         /*
 906                          * We cannot resume card detection immediately
 907                          * because of capacitance and delays in the chip.
 908                          */
 909                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
 910                 }
 911         }
 912         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 913
 914         /*
 915          * Store bus width for later. Will be used when
 916          * setting up the data transfer.
 917          */
 918         host->bus_width = ios->bus_width;
 919
 920         spin_unlock_bh(&host->lock);
 921 }
 922
 923 static int wbsd_get_ro(struct mmc_host *mmc)
 924 {
 925         struct wbsd_host *host = mmc_priv(mmc);
 926         u8 csr;
 927
 928         spin_lock_bh(&host->lock);
 929
 930         csr = inb(host->base + WBSD_CSR);
 931         csr |= WBSD_MSLED;
 932         outb(csr, host->base + WBSD_CSR);
 933
 934         mdelay(1);
 935
 936         csr = inb(host->base + WBSD_CSR);
 937         csr &= ~WBSD_MSLED;
 938         outb(csr, host->base + WBSD_CSR);
 939
 940         spin_unlock_bh(&host->lock);
 941
 942         return !!(csr & WBSD_WRPT);
 943 }
 944
 945 static const struct mmc_host_ops wbsd_ops = {
 946         .request        = wbsd_request,
 947         .set_ios        = wbsd_set_ios,
 948         .get_ro         = wbsd_get_ro,
 949 };
 950
 951 /*****************************************************************************\
 952  *                                                                           *
 953  * Interrupt handling                                                        *
 954  *                                                                           *
 955 \*****************************************************************************/
 956
 957 /*
 958  * Helper function to reset detection ignore
 959  */
 960
 961 static void wbsd_reset_ignore(unsigned long data)
 962 {
 963         struct wbsd_host *host = (struct wbsd_host *)data;
 964
 965         BUG_ON(host == NULL);
 966
 967         DBG("Resetting card detection ignore\n");
 968
 969         spin_lock_bh(&host->lock);
 970
 971         host->flags &= ~WBSD_FIGNORE_DETECT;
 972
 973         /*
 974          * Card status might have changed during the
 975          * blackout.
 976          */
 977         tasklet_schedule(&host->card_tasklet);
 978
 979         spin_unlock_bh(&host->lock);
 980 }
 981
 982 /*
 983  * Tasklets
 984  */
 985
 986 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
 987 {
 988         WARN_ON(!host->mrq);
 989         if (!host->mrq)
 990                 return NULL;
 991
 992         WARN_ON(!host->mrq->cmd);
 993         if (!host->mrq->cmd)
 994                 return NULL;
 995
 996         WARN_ON(!host->mrq->cmd->data);
 997         if (!host->mrq->cmd->data)
 998                 return NULL;
 999
1000         return host->mrq->cmd->data;
1001 }
1002
1003 static void wbsd_tasklet_card(unsigned long param)
1004 {
1005         struct wbsd_host *host = (struct wbsd_host *)param;
1006         u8 csr;
1007         int delay = -1;
1008
1009         spin_lock(&host->lock);
1010
1011         if (host->flags & WBSD_FIGNORE_DETECT) {
1012                 spin_unlock(&host->lock);
1013                 return;
1014         }
1015
1016         csr = inb(host->base + WBSD_CSR);
1017         WARN_ON(csr == 0xff);
1018
1019         if (csr & WBSD_CARDPRESENT) {
1020                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1021                         DBG("Card inserted\n");
1022                         host->flags |= WBSD_FCARD_PRESENT;
1023
1024                         delay = 500;
1025                 }
1026         } else if (host->flags & WBSD_FCARD_PRESENT) {
1027                 DBG("Card removed\n");
1028                 host->flags &= ~WBSD_FCARD_PRESENT;
1029
1030                 if (host->mrq) {
1031                         pr_err("%s: Card removed during transfer!\n",
1032                                 mmc_hostname(host->mmc));
1033                         wbsd_reset(host);
1034
1035                         host->mrq->cmd->error = -ENOMEDIUM;
1036                         tasklet_schedule(&host->finish_tasklet);
1037                 }
1038
1039                 delay = 0;
1040         }
1041
1042         /*
1043          * Unlock first since we might get a call back.
1044          */
1045
1046         spin_unlock(&host->lock);
1047
1048         if (delay != -1)
1049                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1050 }
1051
1052 static void wbsd_tasklet_fifo(unsigned long param)
1053 {
1054         struct wbsd_host *host = (struct wbsd_host *)param;
1055         struct mmc_data *data;
1056
1057         spin_lock(&host->lock);
1058
1059         if (!host->mrq)
1060                 goto end;
1061
1062         data = wbsd_get_data(host);
1063         if (!data)
1064                 goto end;
1065
1066         if (data->flags & MMC_DATA_WRITE)
1067                 wbsd_fill_fifo(host);
1068         else
1069                 wbsd_empty_fifo(host);
1070
1071         /*
1072          * Done?
1073          */
1074         if (host->num_sg == 0) {
1075                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1076                 tasklet_schedule(&host->finish_tasklet);
1077         }
1078
1079 end:
1080         spin_unlock(&host->lock);
1081 }
1082
1083 static void wbsd_tasklet_crc(unsigned long param)
1084 {
1085         struct wbsd_host *host = (struct wbsd_host *)param;
1086         struct mmc_data *data;
1087
1088         spin_lock(&host->lock);
1089
1090         if (!host->mrq)
1091                 goto end;
1092
1093         data = wbsd_get_data(host);
1094         if (!data)
1095                 goto end;
1096
1097         DBGF("CRC error\n");
1098
1099         data->error = -EILSEQ;
1100
1101         tasklet_schedule(&host->finish_tasklet);
1102
1103 end:
1104         spin_unlock(&host->lock);
1105 }
1106
1107 static void wbsd_tasklet_timeout(unsigned long param)
1108 {
1109         struct wbsd_host *host = (struct wbsd_host *)param;
1110         struct mmc_data *data;
1111
1112         spin_lock(&host->lock);
1113
1114         if (!host->mrq)
1115                 goto end;
1116
1117         data = wbsd_get_data(host);
1118         if (!data)
1119                 goto end;
1120
1121         DBGF("Timeout\n");
1122
1123         data->error = -ETIMEDOUT;
1124
1125         tasklet_schedule(&host->finish_tasklet);
1126
1127 end:
1128         spin_unlock(&host->lock);
1129 }
1130
1131 static void wbsd_tasklet_finish(unsigned long param)
1132 {
1133         struct wbsd_host *host = (struct wbsd_host *)param;
1134         struct mmc_data *data;
1135
1136         spin_lock(&host->lock);
1137
1138         WARN_ON(!host->mrq);
1139         if (!host->mrq)
1140                 goto end;
1141
1142         data = wbsd_get_data(host);
1143         if (!data)
1144                 goto end;
1145
1146         wbsd_finish_data(host, data);
1147
1148 end:
1149         spin_unlock(&host->lock);
1150 }
1151
1152 /*
1153  * Interrupt handling
1154  */
1155
1156 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1157 {
1158         struct wbsd_host *host = dev_id;
1159         int isr;
1160
1161         isr = inb(host->base + WBSD_ISR);
1162
1163         /*
1164          * Was it actually our hardware that caused the interrupt?
1165          */
1166         if (isr == 0xff || isr == 0x00)
1167                 return IRQ_NONE;
1168
1169         host->isr |= isr;
1170
1171         /*
1172          * Schedule tasklets as needed.
1173          */
1174         if (isr & WBSD_INT_CARD)
1175                 tasklet_schedule(&host->card_tasklet);
1176         if (isr & WBSD_INT_FIFO_THRE)
1177                 tasklet_schedule(&host->fifo_tasklet);
1178         if (isr & WBSD_INT_CRC)
1179                 tasklet_hi_schedule(&host->crc_tasklet);
1180         if (isr & WBSD_INT_TIMEOUT)
1181                 tasklet_hi_schedule(&host->timeout_tasklet);
1182         if (isr & WBSD_INT_TC)
1183                 tasklet_schedule(&host->finish_tasklet);
1184
1185         return IRQ_HANDLED;
1186 }
1187
1188 /*****************************************************************************\
1189  *                                                                           *
1190  * Device initialisation and shutdown                                        *
1191  *                                                                           *
1192 \*****************************************************************************/
1193
1194 /*
1195  * Allocate/free MMC structure.
1196  */
1197
1198 static int wbsd_alloc_mmc(struct device *dev)
1199 {
1200         struct mmc_host *mmc;
1201         struct wbsd_host *host;
1202
1203         /*
1204          * Allocate MMC structure.
1205          */
1206         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1207         if (!mmc)
1208                 return -ENOMEM;
1209
1210         host = mmc_priv(mmc);
1211         host->mmc = mmc;
1212
1213         host->dma = -1;
1214
1215         /*
1216          * Set host parameters.
1217          */
1218         mmc->ops = &wbsd_ops;
1219         mmc->f_min = 375000;
1220         mmc->f_max = 24000000;
1221         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1222         mmc->caps = MMC_CAP_4_BIT_DATA;
1223
1224         spin_lock_init(&host->lock);
1225
1226         /*
1227          * Set up timers
1228          */
1229         init_timer(&host->ignore_timer);
1230         host->ignore_timer.data = (unsigned long)host;
1231         host->ignore_timer.function = wbsd_reset_ignore;
1232
1233         /*
1234          * Maximum number of segments. Worst case is one sector per segment
1235          * so this will be 64kB/512.
1236          */
1237         mmc->max_segs = 128;
1238
1239         /*
1240          * Maximum request size. Also limited by 64KiB buffer.
1241          */
1242         mmc->max_req_size = 65536;
1243
1244         /*
1245          * Maximum segment size. Could be one segment with the maximum number
1246          * of bytes.
1247          */
1248         mmc->max_seg_size = mmc->max_req_size;
1249
1250         /*
1251          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1252          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1253          */
1254         mmc->max_blk_size = 4087;
1255
1256         /*
1257          * Maximum block count. There is no real limit so the maximum
1258          * request size will be the only restriction.
1259          */
1260         mmc->max_blk_count = mmc->max_req_size;
1261
1262         dev_set_drvdata(dev, mmc);
1263
1264         return 0;
1265 }
1266
1267 static void wbsd_free_mmc(struct device *dev)
1268 {
1269         struct mmc_host *mmc;
1270         struct wbsd_host *host;
1271
1272         mmc = dev_get_drvdata(dev);
1273         if (!mmc)
1274                 return;
1275
1276         host = mmc_priv(mmc);
1277         BUG_ON(host == NULL);
1278
1279         del_timer_sync(&host->ignore_timer);
1280
1281         mmc_free_host(mmc);
1282
1283         dev_set_drvdata(dev, NULL);
1284 }
1285
1286 /*
1287  * Scan for known chip id:s
1288  */
1289
1290 static int wbsd_scan(struct wbsd_host *host)
1291 {
1292         int i, j, k;
1293         int id;
1294
1295         /*
1296          * Iterate through all ports, all codes to
1297          * find hardware that is in our known list.
1298          */
1299         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1300                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1301                         continue;
1302
1303                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1304                         id = 0xFFFF;
1305
1306                         host->config = config_ports[i];
1307                         host->unlock_code = unlock_codes[j];
1308
1309                         wbsd_unlock_config(host);
1310
1311                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1312                         id = inb(config_ports[i] + 1) << 8;
1313
1314                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1315                         id |= inb(config_ports[i] + 1);
1316
1317                         wbsd_lock_config(host);
1318
1319                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1320                                 if (id == valid_ids[k]) {
1321                                         host->chip_id = id;
1322
1323                                         return 0;
1324                                 }
1325                         }
1326
1327                         if (id != 0xFFFF) {
1328                                 DBG("Unknown hardware (id %x) found at %x\n",
1329                                         id, config_ports[i]);
1330                         }
1331                 }
1332
1333                 release_region(config_ports[i], 2);
1334         }
1335
1336         host->config = 0;
1337         host->unlock_code = 0;
1338
1339         return -ENODEV;
1340 }
1341
1342 /*
1343  * Allocate/free io port ranges
1344  */
1345
1346 static int wbsd_request_region(struct wbsd_host *host, int base)
1347 {
1348         if (base & 0x7)
1349                 return -EINVAL;
1350
1351         if (!request_region(base, 8, DRIVER_NAME))
1352                 return -EIO;
1353
1354         host->base = base;
1355
1356         return 0;
1357 }
1358
1359 static void wbsd_release_regions(struct wbsd_host *host)
1360 {
1361         if (host->base)
1362                 release_region(host->base, 8);
1363
1364         host->base = 0;
1365
1366         if (host->config)
1367                 release_region(host->config, 2);
1368
1369         host->config = 0;
1370 }
1371
1372 /*
1373  * Allocate/free DMA port and buffer
1374  */
1375
1376 static void wbsd_request_dma(struct wbsd_host *host, int dma)
1377 {
1378         if (dma < 0)
1379                 return;
1380
1381         if (request_dma(dma, DRIVER_NAME))
1382                 goto err;
1383
1384         /*
1385          * We need to allocate a special buffer in
1386          * order for ISA to be able to DMA to it.
1387          */
1388         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1389                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1390         if (!host->dma_buffer)
1391                 goto free;
1392
1393         /*
1394          * Translate the address to a physical address.
1395          */
1396         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1397                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1398         if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1399                 goto kfree;
1400
1401         /*
1402          * ISA DMA must be aligned on a 64k basis.
1403          */
1404         if ((host->dma_addr & 0xffff) != 0)
1405                 goto unmap;
1406         /*
1407          * ISA cannot access memory above 16 MB.
1408          */
1409         else if (host->dma_addr >= 0x1000000)
1410                 goto unmap;
1411
1412         host->dma = dma;
1413
1414         return;
1415
1416 unmap:
1417         /*
1418          * If we've gotten here then there is some kind of alignment bug
1419          */
1420         BUG_ON(1);
1421
1422         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1423                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1424         host->dma_addr = 0;
1425
1426 kfree:
1427         kfree(host->dma_buffer);
1428         host->dma_buffer = NULL;
1429
1430 free:
1431         free_dma(dma);
1432
1433 err:
1434         pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1435                 dma);
1436 }
1437
1438 static void wbsd_release_dma(struct wbsd_host *host)
1439 {
1440         /*
1441          * host->dma_addr is valid here iff host->dma_buffer is not NULL.
1442          */
1443         if (host->dma_buffer) {
1444                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1445                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1446                 kfree(host->dma_buffer);
1447         }
1448         if (host->dma >= 0)
1449                 free_dma(host->dma);
1450
1451         host->dma = -1;
1452         host->dma_buffer = NULL;
1453         host->dma_addr = 0;
1454 }
1455
1456 /*
1457  * Allocate/free IRQ.
1458  */
1459
1460 static int wbsd_request_irq(struct wbsd_host *host, int irq)
1461 {
1462         int ret;
1463
1464         /*
1465          * Set up tasklets. Must be done before requesting interrupt.
1466          */
1467         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1468                         (unsigned long)host);
1469         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1470                         (unsigned long)host);
1471         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1472                         (unsigned long)host);
1473         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1474                         (unsigned long)host);
1475         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1476                         (unsigned long)host);
1477
1478         /*
1479          * Allocate interrupt.
1480          */
1481         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1482         if (ret)
1483                 return ret;
1484
1485         host->irq = irq;
1486
1487         return 0;
1488 }
1489
1490 static void  wbsd_release_irq(struct wbsd_host *host)
1491 {
1492         if (!host->irq)
1493                 return;
1494
1495         free_irq(host->irq, host);
1496
1497         host->irq = 0;
1498
1499         tasklet_kill(&host->card_tasklet);
1500         tasklet_kill(&host->fifo_tasklet);
1501         tasklet_kill(&host->crc_tasklet);
1502         tasklet_kill(&host->timeout_tasklet);
1503         tasklet_kill(&host->finish_tasklet);
1504 }
1505
1506 /*
1507  * Allocate all resources for the host.
1508  */
1509
1510 static int wbsd_request_resources(struct wbsd_host *host,
1511         int base, int irq, int dma)
1512 {
1513         int ret;
1514
1515         /*
1516          * Allocate I/O ports.
1517          */
1518         ret = wbsd_request_region(host, base);
1519         if (ret)
1520                 return ret;
1521
1522         /*
1523          * Allocate interrupt.
1524          */
1525         ret = wbsd_request_irq(host, irq);
1526         if (ret)
1527                 return ret;
1528
1529         /*
1530          * Allocate DMA.
1531          */
1532         wbsd_request_dma(host, dma);
1533
1534         return 0;
1535 }
1536
1537 /*
1538  * Release all resources for the host.
1539  */
1540
1541 static void wbsd_release_resources(struct wbsd_host *host)
1542 {
1543         wbsd_release_dma(host);
1544         wbsd_release_irq(host);
1545         wbsd_release_regions(host);
1546 }
1547
1548 /*
1549  * Configure the resources the chip should use.
1550  */
1551
1552 static void wbsd_chip_config(struct wbsd_host *host)
1553 {
1554         wbsd_unlock_config(host);
1555
1556         /*
1557          * Reset the chip.
1558          */
1559         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1560         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1561
1562         /*
1563          * Select SD/MMC function.
1564          */
1565         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1566
1567         /*
1568          * Set up card detection.
1569          */
1570         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1571
1572         /*
1573          * Configure chip
1574          */
1575         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1576         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1577
1578         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1579
1580         if (host->dma >= 0)
1581                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1582
1583         /*
1584          * Enable and power up chip.
1585          */
1586         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1587         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1588
1589         wbsd_lock_config(host);
1590 }
1591
1592 /*
1593  * Check that configured resources are correct.
1594  */
1595
1596 static int wbsd_chip_validate(struct wbsd_host *host)
1597 {
1598         int base, irq, dma;
1599
1600         wbsd_unlock_config(host);
1601
1602         /*
1603          * Select SD/MMC function.
1604          */
1605         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1606
1607         /*
1608          * Read configuration.
1609          */
1610         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1611         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1612
1613         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1614
1615         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1616
1617         wbsd_lock_config(host);
1618
1619         /*
1620          * Validate against given configuration.
1621          */
1622         if (base != host->base)
1623                 return 0;
1624         if (irq != host->irq)
1625                 return 0;
1626         if ((dma != host->dma) && (host->dma != -1))
1627                 return 0;
1628
1629         return 1;
1630 }
1631
1632 /*
1633  * Powers down the SD function
1634  */
1635
1636 static void wbsd_chip_poweroff(struct wbsd_host *host)
1637 {
1638         wbsd_unlock_config(host);
1639
1640         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1641         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1642
1643         wbsd_lock_config(host);
1644 }
1645
1646 /*****************************************************************************\
1647  *                                                                           *
1648  * Devices setup and shutdown                                                *
1649  *                                                                           *
1650 \*****************************************************************************/
1651
1652 static int wbsd_init(struct device *dev, int base, int irq, int dma,
1653         int pnp)
1654 {
1655         struct wbsd_host *host = NULL;
1656         struct mmc_host *mmc = NULL;
1657         int ret;
1658
1659         ret = wbsd_alloc_mmc(dev);
1660         if (ret)
1661                 return ret;
1662
1663         mmc = dev_get_drvdata(dev);
1664         host = mmc_priv(mmc);
1665
1666         /*
1667          * Scan for hardware.
1668          */
1669         ret = wbsd_scan(host);
1670         if (ret) {
1671                 if (pnp && (ret == -ENODEV)) {
1672                         pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1673                 } else {
1674                         wbsd_free_mmc(dev);
1675                         return ret;
1676                 }
1677         }
1678
1679         /*
1680          * Request resources.
1681          */
1682         ret = wbsd_request_resources(host, base, irq, dma);
1683         if (ret) {
1684                 wbsd_release_resources(host);
1685                 wbsd_free_mmc(dev);
1686                 return ret;
1687         }
1688
1689         /*
1690          * See if chip needs to be configured.
1691          */
1692         if (pnp) {
1693                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1694                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1695                         wbsd_chip_config(host);
1696                 }
1697         } else
1698                 wbsd_chip_config(host);
1699
1700         /*
1701          * Power Management stuff. No idea how this works.
1702          * Not tested.
1703          */
1704 #ifdef CONFIG_PM
1705         if (host->config) {
1706                 wbsd_unlock_config(host);
1707                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1708                 wbsd_lock_config(host);
1709         }
1710 #endif
1711         /*
1712          * Allow device to initialise itself properly.
1713          */
1714         mdelay(5);
1715
1716         /*
1717          * Reset the chip into a known state.
1718          */
1719         wbsd_init_device(host);
1720
1721         mmc_add_host(mmc);
1722
1723         pr_info("%s: W83L51xD", mmc_hostname(mmc));
1724         if (host->chip_id != 0)
1725                 printk(" id %x", (int)host->chip_id);
1726         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1727         if (host->dma >= 0)
1728                 printk(" dma %d", (int)host->dma);
1729         else
1730                 printk(" FIFO");
1731         if (pnp)
1732                 printk(" PnP");
1733         printk("\n");
1734
1735         return 0;
1736 }
1737
1738 static void wbsd_shutdown(struct device *dev, int pnp)
1739 {
1740         struct mmc_host *mmc = dev_get_drvdata(dev);
1741         struct wbsd_host *host;
1742
1743         if (!mmc)
1744                 return;
1745
1746         host = mmc_priv(mmc);
1747
1748         mmc_remove_host(mmc);
1749
1750         /*
1751          * Power down the SD/MMC function.
1752          */
1753         if (!pnp)
1754                 wbsd_chip_poweroff(host);
1755
1756         wbsd_release_resources(host);
1757
1758         wbsd_free_mmc(dev);
1759 }
1760
1761 /*
1762  * Non-PnP
1763  */
1764
1765 static int wbsd_probe(struct platform_device *dev)
1766 {
1767         /* Use the module parameters for resources */
1768         return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1769 }
1770
1771 static int wbsd_remove(struct platform_device *dev)
1772 {
1773         wbsd_shutdown(&dev->dev, 0);
1774
1775         return 0;
1776 }
1777
1778 /*
1779  * PnP
1780  */
1781
1782 #ifdef CONFIG_PNP
1783
1784 static int
1785 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1786 {
1787         int io, irq, dma;
1788
1789         /*
1790          * Get resources from PnP layer.
1791          */
1792         io = pnp_port_start(pnpdev, 0);
1793         irq = pnp_irq(pnpdev, 0);
1794         if (pnp_dma_valid(pnpdev, 0))
1795                 dma = pnp_dma(pnpdev, 0);
1796         else
1797                 dma = -1;
1798
1799         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1800
1801         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1802 }
1803
1804 static void wbsd_pnp_remove(struct pnp_dev *dev)
1805 {
1806         wbsd_shutdown(&dev->dev, 1);
1807 }
1808
1809 #endif /* CONFIG_PNP */
1810
1811 /*
1812  * Power management
1813  */
1814
1815 #ifdef CONFIG_PM
1816
1817 static int wbsd_platform_suspend(struct platform_device *dev,
1818                                  pm_message_t state)
1819 {
1820         struct mmc_host *mmc = platform_get_drvdata(dev);
1821         struct wbsd_host *host;
1822
1823         if (mmc == NULL)
1824                 return 0;
1825
1826         DBGF("Suspending...\n");
1827
1828         host = mmc_priv(mmc);
1829
1830         wbsd_chip_poweroff(host);
1831         return 0;
1832 }
1833
1834 static int wbsd_platform_resume(struct platform_device *dev)
1835 {
1836         struct mmc_host *mmc = platform_get_drvdata(dev);
1837         struct wbsd_host *host;
1838
1839         if (mmc == NULL)
1840                 return 0;
1841
1842         DBGF("Resuming...\n");
1843
1844         host = mmc_priv(mmc);
1845
1846         wbsd_chip_config(host);
1847
1848         /*
1849          * Allow device to initialise itself properly.
1850          */
1851         mdelay(5);
1852
1853         wbsd_init_device(host);
1854         return 0;
1855 }
1856
1857 #ifdef CONFIG_PNP
1858
1859 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1860 {
1861         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1862
1863         if (mmc == NULL)
1864                 return 0;
1865
1866         DBGF("Suspending...\n");
1867         return 0;
1868 }
1869
1870 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1871 {
1872         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1873         struct wbsd_host *host;
1874
1875         if (mmc == NULL)
1876                 return 0;
1877
1878         DBGF("Resuming...\n");
1879
1880         host = mmc_priv(mmc);
1881
1882         /*
1883          * See if chip needs to be configured.
1884          */
1885         if (host->config != 0) {
1886                 if (!wbsd_chip_validate(host)) {
1887                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1888                         wbsd_chip_config(host);
1889                 }
1890         }
1891
1892         /*
1893          * Allow device to initialise itself properly.
1894          */
1895         mdelay(5);
1896
1897         wbsd_init_device(host);
1898         return 0;
1899 }
1900
1901 #endif /* CONFIG_PNP */
1902
1903 #else /* CONFIG_PM */
1904
1905 #define wbsd_platform_suspend NULL
1906 #define wbsd_platform_resume NULL
1907
1908 #define wbsd_pnp_suspend NULL
1909 #define wbsd_pnp_resume NULL
1910
1911 #endif /* CONFIG_PM */
1912
1913 static struct platform_device *wbsd_device;
1914
1915 static struct platform_driver wbsd_driver = {
1916         .probe          = wbsd_probe,
1917         .remove         = wbsd_remove,
1918
1919         .suspend        = wbsd_platform_suspend,
1920         .resume         = wbsd_platform_resume,
1921         .driver         = {
1922                 .name   = DRIVER_NAME,
1923         },
1924 };
1925
1926 #ifdef CONFIG_PNP
1927
1928 static struct pnp_driver wbsd_pnp_driver = {
1929         .name           = DRIVER_NAME,
1930         .id_table       = pnp_dev_table,
1931         .probe          = wbsd_pnp_probe,
1932         .remove         = wbsd_pnp_remove,
1933
1934         .suspend        = wbsd_pnp_suspend,
1935         .resume         = wbsd_pnp_resume,
1936 };
1937
1938 #endif /* CONFIG_PNP */
1939
1940 /*
1941  * Module loading/unloading
1942  */
1943
1944 static int __init wbsd_drv_init(void)
1945 {
1946         int result;
1947
1948         pr_info(DRIVER_NAME
1949                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1950         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1951
1952 #ifdef CONFIG_PNP
1953
1954         if (!param_nopnp) {
1955                 result = pnp_register_driver(&wbsd_pnp_driver);
1956                 if (result < 0)
1957                         return result;
1958         }
1959 #endif /* CONFIG_PNP */
1960
1961         if (param_nopnp) {
1962                 result = platform_driver_register(&wbsd_driver);
1963                 if (result < 0)
1964                         return result;
1965
1966                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1967                 if (!wbsd_device) {
1968                         platform_driver_unregister(&wbsd_driver);
1969                         return -ENOMEM;
1970                 }
1971
1972                 result = platform_device_add(wbsd_device);
1973                 if (result) {
1974                         platform_device_put(wbsd_device);
1975                         platform_driver_unregister(&wbsd_driver);
1976                         return result;
1977                 }
1978         }
1979
1980         return 0;
1981 }
1982
1983 static void __exit wbsd_drv_exit(void)
1984 {
1985 #ifdef CONFIG_PNP
1986
1987         if (!param_nopnp)
1988                 pnp_unregister_driver(&wbsd_pnp_driver);
1989
1990 #endif /* CONFIG_PNP */
1991
1992         if (param_nopnp) {
1993                 platform_device_unregister(wbsd_device);
1994
1995                 platform_driver_unregister(&wbsd_driver);
1996         }
1997
1998         DBG("unloaded\n");
1999 }
2000
2001 module_init(wbsd_drv_init);
2002 module_exit(wbsd_drv_exit);
2003 #ifdef CONFIG_PNP
2004 module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
2005 #endif
2006 module_param_hw_named(io, param_io, uint, ioport, 0444);
2007 module_param_hw_named(irq, param_irq, uint, irq, 0444);
2008 module_param_hw_named(dma, param_dma, int, dma, 0444);
2009
2010 MODULE_LICENSE("GPL");
2011 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2012 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2013
2014 #ifdef CONFIG_PNP
2015 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2016 #endif
2017 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2018 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2019 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");