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
  38 #include <asm/io.h>
  39 #include <asm/dma.h>
  40
  41 #include "wbsd.h"
  42
  43 #define DRIVER_NAME "wbsd"
  44
  45 #define DBG(x...) \
  46         pr_debug(DRIVER_NAME ": " x)
  47 #define DBGF(f, x...) \
  48         pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
  49
  50 /*
  51  * Device resources
  52  */
  53
  54 #ifdef CONFIG_PNP
  55
  56 static const struct pnp_device_id pnp_dev_table[] = {
  57         { "WEC0517", 0 },
  58         { "WEC0518", 0 },
  59         { "", 0 },
  60 };
  61
  62 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
  63
  64 #endif /* CONFIG_PNP */
  65
  66 static const int config_ports[] = { 0x2E, 0x4E };
  67 static const int unlock_codes[] = { 0x83, 0x87 };
  68
  69 static const int valid_ids[] = {
  70         0x7112,
  71         };
  72
  73 #ifdef CONFIG_PNP
  74 static unsigned int nopnp = 0;
  75 #else
  76 static const unsigned int nopnp = 1;
  77 #endif
  78 static unsigned int io = 0x248;
  79 static unsigned int irq = 6;
  80 static int dma = 2;
  81
  82 /*
  83  * Basic functions
  84  */
  85
  86 static inline void wbsd_unlock_config(struct wbsd_host *host)
  87 {
  88         BUG_ON(host->config == 0);
  89
  90         outb(host->unlock_code, host->config);
  91         outb(host->unlock_code, host->config);
  92 }
  93
  94 static inline void wbsd_lock_config(struct wbsd_host *host)
  95 {
  96         BUG_ON(host->config == 0);
  97
  98         outb(LOCK_CODE, host->config);
  99 }
 100
 101 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
 102 {
 103         BUG_ON(host->config == 0);
 104
 105         outb(reg, host->config);
 106         outb(value, host->config + 1);
 107 }
 108
 109 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
 110 {
 111         BUG_ON(host->config == 0);
 112
 113         outb(reg, host->config);
 114         return inb(host->config + 1);
 115 }
 116
 117 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
 118 {
 119         outb(index, host->base + WBSD_IDXR);
 120         outb(value, host->base + WBSD_DATAR);
 121 }
 122
 123 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
 124 {
 125         outb(index, host->base + WBSD_IDXR);
 126         return inb(host->base + WBSD_DATAR);
 127 }
 128
 129 /*
 130  * Common routines
 131  */
 132
 133 static void wbsd_init_device(struct wbsd_host *host)
 134 {
 135         u8 setup, ier;
 136
 137         /*
 138          * Reset chip (SD/MMC part) and fifo.
 139          */
 140         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 141         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
 142         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 143
 144         /*
 145          * Set DAT3 to input
 146          */
 147         setup &= ~WBSD_DAT3_H;
 148         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 149         host->flags &= ~WBSD_FIGNORE_DETECT;
 150
 151         /*
 152          * Read back default clock.
 153          */
 154         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
 155
 156         /*
 157          * Power down port.
 158          */
 159         outb(WBSD_POWER_N, host->base + WBSD_CSR);
 160
 161         /*
 162          * Set maximum timeout.
 163          */
 164         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
 165
 166         /*
 167          * Test for card presence
 168          */
 169         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
 170                 host->flags |= WBSD_FCARD_PRESENT;
 171         else
 172                 host->flags &= ~WBSD_FCARD_PRESENT;
 173
 174         /*
 175          * Enable interesting interrupts.
 176          */
 177         ier = 0;
 178         ier |= WBSD_EINT_CARD;
 179         ier |= WBSD_EINT_FIFO_THRE;
 180         ier |= WBSD_EINT_CRC;
 181         ier |= WBSD_EINT_TIMEOUT;
 182         ier |= WBSD_EINT_TC;
 183
 184         outb(ier, host->base + WBSD_EIR);
 185
 186         /*
 187          * Clear interrupts.
 188          */
 189         inb(host->base + WBSD_ISR);
 190 }
 191
 192 static void wbsd_reset(struct wbsd_host *host)
 193 {
 194         u8 setup;
 195
 196         printk(KERN_ERR "%s: Resetting chip\n", mmc_hostname(host->mmc));
 197
 198         /*
 199          * Soft reset of chip (SD/MMC part).
 200          */
 201         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 202         setup |= WBSD_SOFT_RESET;
 203         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 204 }
 205
 206 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
 207 {
 208         unsigned long dmaflags;
 209
 210         if (host->dma >= 0) {
 211                 /*
 212                  * Release ISA DMA controller.
 213                  */
 214                 dmaflags = claim_dma_lock();
 215                 disable_dma(host->dma);
 216                 clear_dma_ff(host->dma);
 217                 release_dma_lock(dmaflags);
 218
 219                 /*
 220                  * Disable DMA on host.
 221                  */
 222                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 223         }
 224
 225         host->mrq = NULL;
 226
 227         /*
 228          * MMC layer might call back into the driver so first unlock.
 229          */
 230         spin_unlock(&host->lock);
 231         mmc_request_done(host->mmc, mrq);
 232         spin_lock(&host->lock);
 233 }
 234
 235 /*
 236  * Scatter/gather functions
 237  */
 238
 239 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
 240 {
 241         /*
 242          * Get info. about SG list from data structure.
 243          */
 244         host->cur_sg = data->sg;
 245         host->num_sg = data->sg_len;
 246
 247         host->offset = 0;
 248         host->remain = host->cur_sg->length;
 249 }
 250
 251 static inline int wbsd_next_sg(struct wbsd_host *host)
 252 {
 253         /*
 254          * Skip to next SG entry.
 255          */
 256         host->cur_sg++;
 257         host->num_sg--;
 258
 259         /*
 260          * Any entries left?
 261          */
 262         if (host->num_sg > 0) {
 263                 host->offset = 0;
 264                 host->remain = host->cur_sg->length;
 265         }
 266
 267         return host->num_sg;
 268 }
 269
 270 static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
 271 {
 272         return sg_virt(host->cur_sg);
 273 }
 274
 275 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
 276 {
 277         unsigned int len, i;
 278         struct scatterlist *sg;
 279         char *dmabuf = host->dma_buffer;
 280         char *sgbuf;
 281
 282         sg = data->sg;
 283         len = data->sg_len;
 284
 285         for (i = 0; i < len; i++) {
 286                 sgbuf = sg_virt(&sg[i]);
 287                 memcpy(dmabuf, sgbuf, sg[i].length);
 288                 dmabuf += sg[i].length;
 289         }
 290 }
 291
 292 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
 293 {
 294         unsigned int len, i;
 295         struct scatterlist *sg;
 296         char *dmabuf = host->dma_buffer;
 297         char *sgbuf;
 298
 299         sg = data->sg;
 300         len = data->sg_len;
 301
 302         for (i = 0; i < len; i++) {
 303                 sgbuf = sg_virt(&sg[i]);
 304                 memcpy(sgbuf, dmabuf, sg[i].length);
 305                 dmabuf += sg[i].length;
 306         }
 307 }
 308
 309 /*
 310  * Command handling
 311  */
 312
 313 static inline void wbsd_get_short_reply(struct wbsd_host *host,
 314                                         struct mmc_command *cmd)
 315 {
 316         /*
 317          * Correct response type?
 318          */
 319         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
 320                 cmd->error = -EILSEQ;
 321                 return;
 322         }
 323
 324         cmd->resp[0]  = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
 325         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
 326         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
 327         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
 328         cmd->resp[1]  = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
 329 }
 330
 331 static inline void wbsd_get_long_reply(struct wbsd_host *host,
 332         struct mmc_command *cmd)
 333 {
 334         int i;
 335
 336         /*
 337          * Correct response type?
 338          */
 339         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
 340                 cmd->error = -EILSEQ;
 341                 return;
 342         }
 343
 344         for (i = 0; i < 4; i++) {
 345                 cmd->resp[i] =
 346                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
 347                 cmd->resp[i] |=
 348                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
 349                 cmd->resp[i] |=
 350                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
 351                 cmd->resp[i] |=
 352                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
 353         }
 354 }
 355
 356 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
 357 {
 358         int i;
 359         u8 status, isr;
 360
 361         /*
 362          * Clear accumulated ISR. The interrupt routine
 363          * will fill this one with events that occur during
 364          * transfer.
 365          */
 366         host->isr = 0;
 367
 368         /*
 369          * Send the command (CRC calculated by host).
 370          */
 371         outb(cmd->opcode, host->base + WBSD_CMDR);
 372         for (i = 3; i >= 0; i--)
 373                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
 374
 375         cmd->error = 0;
 376
 377         /*
 378          * Wait for the request to complete.
 379          */
 380         do {
 381                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 382         } while (status & WBSD_CARDTRAFFIC);
 383
 384         /*
 385          * Do we expect a reply?
 386          */
 387         if (cmd->flags & MMC_RSP_PRESENT) {
 388                 /*
 389                  * Read back status.
 390                  */
 391                 isr = host->isr;
 392
 393                 /* Card removed? */
 394                 if (isr & WBSD_INT_CARD)
 395                         cmd->error = -ENOMEDIUM;
 396                 /* Timeout? */
 397                 else if (isr & WBSD_INT_TIMEOUT)
 398                         cmd->error = -ETIMEDOUT;
 399                 /* CRC? */
 400                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 401                         cmd->error = -EILSEQ;
 402                 /* All ok */
 403                 else {
 404                         if (cmd->flags & MMC_RSP_136)
 405                                 wbsd_get_long_reply(host, cmd);
 406                         else
 407                                 wbsd_get_short_reply(host, cmd);
 408                 }
 409         }
 410 }
 411
 412 /*
 413  * Data functions
 414  */
 415
 416 static void wbsd_empty_fifo(struct wbsd_host *host)
 417 {
 418         struct mmc_data *data = host->mrq->cmd->data;
 419         char *buffer;
 420         int i, fsr, fifo;
 421
 422         /*
 423          * Handle excessive data.
 424          */
 425         if (host->num_sg == 0)
 426                 return;
 427
 428         buffer = wbsd_sg_to_buffer(host) + host->offset;
 429
 430         /*
 431          * Drain the fifo. This has a tendency to loop longer
 432          * than the FIFO length (usually one block).
 433          */
 434         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
 435                 /*
 436                  * The size field in the FSR is broken so we have to
 437                  * do some guessing.
 438                  */
 439                 if (fsr & WBSD_FIFO_FULL)
 440                         fifo = 16;
 441                 else if (fsr & WBSD_FIFO_FUTHRE)
 442                         fifo = 8;
 443                 else
 444                         fifo = 1;
 445
 446                 for (i = 0; i < fifo; i++) {
 447                         *buffer = inb(host->base + WBSD_DFR);
 448                         buffer++;
 449                         host->offset++;
 450                         host->remain--;
 451
 452                         data->bytes_xfered++;
 453
 454                         /*
 455                          * End of scatter list entry?
 456                          */
 457                         if (host->remain == 0) {
 458                                 /*
 459                                  * Get next entry. Check if last.
 460                                  */
 461                                 if (!wbsd_next_sg(host))
 462                                         return;
 463
 464                                 buffer = wbsd_sg_to_buffer(host);
 465                         }
 466                 }
 467         }
 468
 469         /*
 470          * This is a very dirty hack to solve a
 471          * hardware problem. The chip doesn't trigger
 472          * FIFO threshold interrupts properly.
 473          */
 474         if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
 475                 tasklet_schedule(&host->fifo_tasklet);
 476 }
 477
 478 static void wbsd_fill_fifo(struct wbsd_host *host)
 479 {
 480         struct mmc_data *data = host->mrq->cmd->data;
 481         char *buffer;
 482         int i, fsr, fifo;
 483
 484         /*
 485          * Check that we aren't being called after the
 486          * entire buffer has been transfered.
 487          */
 488         if (host->num_sg == 0)
 489                 return;
 490
 491         buffer = wbsd_sg_to_buffer(host) + host->offset;
 492
 493         /*
 494          * Fill the fifo. This has a tendency to loop longer
 495          * than the FIFO length (usually one block).
 496          */
 497         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
 498                 /*
 499                  * The size field in the FSR is broken so we have to
 500                  * do some guessing.
 501                  */
 502                 if (fsr & WBSD_FIFO_EMPTY)
 503                         fifo = 0;
 504                 else if (fsr & WBSD_FIFO_EMTHRE)
 505                         fifo = 8;
 506                 else
 507                         fifo = 15;
 508
 509                 for (i = 16; i > fifo; i--) {
 510                         outb(*buffer, host->base + WBSD_DFR);
 511                         buffer++;
 512                         host->offset++;
 513                         host->remain--;
 514
 515                         data->bytes_xfered++;
 516
 517                         /*
 518                          * End of scatter list entry?
 519                          */
 520                         if (host->remain == 0) {
 521                                 /*
 522                                  * Get next entry. Check if last.
 523                                  */
 524                                 if (!wbsd_next_sg(host))
 525                                         return;
 526
 527                                 buffer = wbsd_sg_to_buffer(host);
 528                         }
 529                 }
 530         }
 531
 532         /*
 533          * The controller stops sending interrupts for
 534          * 'FIFO empty' under certain conditions. So we
 535          * need to be a bit more pro-active.
 536          */
 537         tasklet_schedule(&host->fifo_tasklet);
 538 }
 539
 540 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
 541 {
 542         u16 blksize;
 543         u8 setup;
 544         unsigned long dmaflags;
 545         unsigned int size;
 546
 547         /*
 548          * Calculate size.
 549          */
 550         size = data->blocks * data->blksz;
 551
 552         /*
 553          * Check timeout values for overflow.
 554          * (Yes, some cards cause this value to overflow).
 555          */
 556         if (data->timeout_ns > 127000000)
 557                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
 558         else {
 559                 wbsd_write_index(host, WBSD_IDX_TAAC,
 560                         data->timeout_ns / 1000000);
 561         }
 562
 563         if (data->timeout_clks > 255)
 564                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
 565         else
 566                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
 567
 568         /*
 569          * Inform the chip of how large blocks will be
 570          * sent. It needs this to determine when to
 571          * calculate CRC.
 572          *
 573          * Space for CRC must be included in the size.
 574          * Two bytes are needed for each data line.
 575          */
 576         if (host->bus_width == MMC_BUS_WIDTH_1) {
 577                 blksize = data->blksz + 2;
 578
 579                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 580                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 581         } else if (host->bus_width == MMC_BUS_WIDTH_4) {
 582                 blksize = data->blksz + 2 * 4;
 583
 584                 wbsd_write_index(host, WBSD_IDX_PBSMSB,
 585                         ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
 586                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 587         } else {
 588                 data->error = -EINVAL;
 589                 return;
 590         }
 591
 592         /*
 593          * Clear the FIFO. This is needed even for DMA
 594          * transfers since the chip still uses the FIFO
 595          * internally.
 596          */
 597         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 598         setup |= WBSD_FIFO_RESET;
 599         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 600
 601         /*
 602          * DMA transfer?
 603          */
 604         if (host->dma >= 0) {
 605                 /*
 606                  * The buffer for DMA is only 64 kB.
 607                  */
 608                 BUG_ON(size > 0x10000);
 609                 if (size > 0x10000) {
 610                         data->error = -EINVAL;
 611                         return;
 612                 }
 613
 614                 /*
 615                  * Transfer data from the SG list to
 616                  * the DMA buffer.
 617                  */
 618                 if (data->flags & MMC_DATA_WRITE)
 619                         wbsd_sg_to_dma(host, data);
 620
 621                 /*
 622                  * Initialise the ISA DMA controller.
 623                  */
 624                 dmaflags = claim_dma_lock();
 625                 disable_dma(host->dma);
 626                 clear_dma_ff(host->dma);
 627                 if (data->flags & MMC_DATA_READ)
 628                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 629                 else
 630                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 631                 set_dma_addr(host->dma, host->dma_addr);
 632                 set_dma_count(host->dma, size);
 633
 634                 enable_dma(host->dma);
 635                 release_dma_lock(dmaflags);
 636
 637                 /*
 638                  * Enable DMA on the host.
 639                  */
 640                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 641         } else {
 642                 /*
 643                  * This flag is used to keep printk
 644                  * output to a minimum.
 645                  */
 646                 host->firsterr = 1;
 647
 648                 /*
 649                  * Initialise the SG list.
 650                  */
 651                 wbsd_init_sg(host, data);
 652
 653                 /*
 654                  * Turn off DMA.
 655                  */
 656                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 657
 658                 /*
 659                  * Set up FIFO threshold levels (and fill
 660                  * buffer if doing a write).
 661                  */
 662                 if (data->flags & MMC_DATA_READ) {
 663                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 664                                 WBSD_FIFOEN_FULL | 8);
 665                 } else {
 666                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 667                                 WBSD_FIFOEN_EMPTY | 8);
 668                         wbsd_fill_fifo(host);
 669                 }
 670         }
 671
 672         data->error = 0;
 673 }
 674
 675 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
 676 {
 677         unsigned long dmaflags;
 678         int count;
 679         u8 status;
 680
 681         WARN_ON(host->mrq == NULL);
 682
 683         /*
 684          * Send a stop command if needed.
 685          */
 686         if (data->stop)
 687                 wbsd_send_command(host, data->stop);
 688
 689         /*
 690          * Wait for the controller to leave data
 691          * transfer state.
 692          */
 693         do {
 694                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 695         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 696
 697         /*
 698          * DMA transfer?
 699          */
 700         if (host->dma >= 0) {
 701                 /*
 702                  * Disable DMA on the host.
 703                  */
 704                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 705
 706                 /*
 707                  * Turn of ISA DMA controller.
 708                  */
 709                 dmaflags = claim_dma_lock();
 710                 disable_dma(host->dma);
 711                 clear_dma_ff(host->dma);
 712                 count = get_dma_residue(host->dma);
 713                 release_dma_lock(dmaflags);
 714
 715                 data->bytes_xfered = host->mrq->data->blocks *
 716                         host->mrq->data->blksz - count;
 717                 data->bytes_xfered -= data->bytes_xfered % data->blksz;
 718
 719                 /*
 720                  * Any leftover data?
 721                  */
 722                 if (count) {
 723                         printk(KERN_ERR "%s: Incomplete DMA transfer. "
 724                                 "%d bytes left.\n",
 725                                 mmc_hostname(host->mmc), count);
 726
 727                         if (!data->error)
 728                                 data->error = -EIO;
 729                 } else {
 730                         /*
 731                          * Transfer data from DMA buffer to
 732                          * SG list.
 733                          */
 734                         if (data->flags & MMC_DATA_READ)
 735                                 wbsd_dma_to_sg(host, data);
 736                 }
 737
 738                 if (data->error) {
 739                         if (data->bytes_xfered)
 740                                 data->bytes_xfered -= data->blksz;
 741                 }
 742         }
 743
 744         wbsd_request_end(host, host->mrq);
 745 }
 746
 747 /*****************************************************************************\
 748  *                                                                           *
 749  * MMC layer callbacks                                                       *
 750  *                                                                           *
 751 \*****************************************************************************/
 752
 753 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 754 {
 755         struct wbsd_host *host = mmc_priv(mmc);
 756         struct mmc_command *cmd;
 757
 758         /*
 759          * Disable tasklets to avoid a deadlock.
 760          */
 761         spin_lock_bh(&host->lock);
 762
 763         BUG_ON(host->mrq != NULL);
 764
 765         cmd = mrq->cmd;
 766
 767         host->mrq = mrq;
 768
 769         /*
 770          * Check that there is actually a card in the slot.
 771          */
 772         if (!(host->flags & WBSD_FCARD_PRESENT)) {
 773                 cmd->error = -ENOMEDIUM;
 774                 goto done;
 775         }
 776
 777         if (cmd->data) {
 778                 /*
 779                  * The hardware is so delightfully stupid that it has a list
 780                  * of "data" commands. If a command isn't on this list, it'll
 781                  * just go back to the idle state and won't send any data
 782                  * interrupts.
 783                  */
 784                 switch (cmd->opcode) {
 785                 case 11:
 786                 case 17:
 787                 case 18:
 788                 case 20:
 789                 case 24:
 790                 case 25:
 791                 case 26:
 792                 case 27:
 793                 case 30:
 794                 case 42:
 795                 case 56:
 796                         break;
 797
 798                 /* ACMDs. We don't keep track of state, so we just treat them
 799                  * like any other command. */
 800                 case 51:
 801                         break;
 802
 803                 default:
 804 #ifdef CONFIG_MMC_DEBUG
 805                         printk(KERN_WARNING "%s: Data command %d is not "
 806                                 "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          * transfered.
 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 immediatly
 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                         printk(KERN_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 __devinit 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 | MMC_CAP_MULTIWRITE;
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_hw_segs = 128;
1238         mmc->max_phys_segs = 128;
1239
1240         /*
1241          * Maximum request size. Also limited by 64KiB buffer.
1242          */
1243         mmc->max_req_size = 65536;
1244
1245         /*
1246          * Maximum segment size. Could be one segment with the maximum number
1247          * of bytes.
1248          */
1249         mmc->max_seg_size = mmc->max_req_size;
1250
1251         /*
1252          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1253          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1254          */
1255         mmc->max_blk_size = 4087;
1256
1257         /*
1258          * Maximum block count. There is no real limit so the maximum
1259          * request size will be the only restriction.
1260          */
1261         mmc->max_blk_count = mmc->max_req_size;
1262
1263         dev_set_drvdata(dev, mmc);
1264
1265         return 0;
1266 }
1267
1268 static void wbsd_free_mmc(struct device *dev)
1269 {
1270         struct mmc_host *mmc;
1271         struct wbsd_host *host;
1272
1273         mmc = dev_get_drvdata(dev);
1274         if (!mmc)
1275                 return;
1276
1277         host = mmc_priv(mmc);
1278         BUG_ON(host == NULL);
1279
1280         del_timer_sync(&host->ignore_timer);
1281
1282         mmc_free_host(mmc);
1283
1284         dev_set_drvdata(dev, NULL);
1285 }
1286
1287 /*
1288  * Scan for known chip id:s
1289  */
1290
1291 static int __devinit wbsd_scan(struct wbsd_host *host)
1292 {
1293         int i, j, k;
1294         int id;
1295
1296         /*
1297          * Iterate through all ports, all codes to
1298          * find hardware that is in our known list.
1299          */
1300         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1301                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1302                         continue;
1303
1304                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1305                         id = 0xFFFF;
1306
1307                         host->config = config_ports[i];
1308                         host->unlock_code = unlock_codes[j];
1309
1310                         wbsd_unlock_config(host);
1311
1312                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1313                         id = inb(config_ports[i] + 1) << 8;
1314
1315                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1316                         id |= inb(config_ports[i] + 1);
1317
1318                         wbsd_lock_config(host);
1319
1320                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1321                                 if (id == valid_ids[k]) {
1322                                         host->chip_id = id;
1323
1324                                         return 0;
1325                                 }
1326                         }
1327
1328                         if (id != 0xFFFF) {
1329                                 DBG("Unknown hardware (id %x) found at %x\n",
1330                                         id, config_ports[i]);
1331                         }
1332                 }
1333
1334                 release_region(config_ports[i], 2);
1335         }
1336
1337         host->config = 0;
1338         host->unlock_code = 0;
1339
1340         return -ENODEV;
1341 }
1342
1343 /*
1344  * Allocate/free io port ranges
1345  */
1346
1347 static int __devinit wbsd_request_region(struct wbsd_host *host, int base)
1348 {
1349         if (base & 0x7)
1350                 return -EINVAL;
1351
1352         if (!request_region(base, 8, DRIVER_NAME))
1353                 return -EIO;
1354
1355         host->base = base;
1356
1357         return 0;
1358 }
1359
1360 static void wbsd_release_regions(struct wbsd_host *host)
1361 {
1362         if (host->base)
1363                 release_region(host->base, 8);
1364
1365         host->base = 0;
1366
1367         if (host->config)
1368                 release_region(host->config, 2);
1369
1370         host->config = 0;
1371 }
1372
1373 /*
1374  * Allocate/free DMA port and buffer
1375  */
1376
1377 static void __devinit wbsd_request_dma(struct wbsd_host *host, int dma)
1378 {
1379         if (dma < 0)
1380                 return;
1381
1382         if (request_dma(dma, DRIVER_NAME))
1383                 goto err;
1384
1385         /*
1386          * We need to allocate a special buffer in
1387          * order for ISA to be able to DMA to it.
1388          */
1389         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1390                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1391         if (!host->dma_buffer)
1392                 goto free;
1393
1394         /*
1395          * Translate the address to a physical address.
1396          */
1397         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1398                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1399
1400         /*
1401          * ISA DMA must be aligned on a 64k basis.
1402          */
1403         if ((host->dma_addr & 0xffff) != 0)
1404                 goto kfree;
1405         /*
1406          * ISA cannot access memory above 16 MB.
1407          */
1408         else if (host->dma_addr >= 0x1000000)
1409                 goto kfree;
1410
1411         host->dma = dma;
1412
1413         return;
1414
1415 kfree:
1416         /*
1417          * If we've gotten here then there is some kind of alignment bug
1418          */
1419         BUG_ON(1);
1420
1421         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1422                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1423         host->dma_addr = (dma_addr_t)NULL;
1424
1425         kfree(host->dma_buffer);
1426         host->dma_buffer = NULL;
1427
1428 free:
1429         free_dma(dma);
1430
1431 err:
1432         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1433                 "Falling back on FIFO.\n", dma);
1434 }
1435
1436 static void wbsd_release_dma(struct wbsd_host *host)
1437 {
1438         if (host->dma_addr) {
1439                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1440                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1441         }
1442         kfree(host->dma_buffer);
1443         if (host->dma >= 0)
1444                 free_dma(host->dma);
1445
1446         host->dma = -1;
1447         host->dma_buffer = NULL;
1448         host->dma_addr = (dma_addr_t)NULL;
1449 }
1450
1451 /*
1452  * Allocate/free IRQ.
1453  */
1454
1455 static int __devinit wbsd_request_irq(struct wbsd_host *host, int irq)
1456 {
1457         int ret;
1458
1459         /*
1460          * Allocate interrupt.
1461          */
1462
1463         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1464         if (ret)
1465                 return ret;
1466
1467         host->irq = irq;
1468
1469         /*
1470          * Set up tasklets.
1471          */
1472         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1473                         (unsigned long)host);
1474         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1475                         (unsigned long)host);
1476         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1477                         (unsigned long)host);
1478         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1479                         (unsigned long)host);
1480         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1481                         (unsigned long)host);
1482
1483         return 0;
1484 }
1485
1486 static void  wbsd_release_irq(struct wbsd_host *host)
1487 {
1488         if (!host->irq)
1489                 return;
1490
1491         free_irq(host->irq, host);
1492
1493         host->irq = 0;
1494
1495         tasklet_kill(&host->card_tasklet);
1496         tasklet_kill(&host->fifo_tasklet);
1497         tasklet_kill(&host->crc_tasklet);
1498         tasklet_kill(&host->timeout_tasklet);
1499         tasklet_kill(&host->finish_tasklet);
1500 }
1501
1502 /*
1503  * Allocate all resources for the host.
1504  */
1505
1506 static int __devinit wbsd_request_resources(struct wbsd_host *host,
1507         int base, int irq, int dma)
1508 {
1509         int ret;
1510
1511         /*
1512          * Allocate I/O ports.
1513          */
1514         ret = wbsd_request_region(host, base);
1515         if (ret)
1516                 return ret;
1517
1518         /*
1519          * Allocate interrupt.
1520          */
1521         ret = wbsd_request_irq(host, irq);
1522         if (ret)
1523                 return ret;
1524
1525         /*
1526          * Allocate DMA.
1527          */
1528         wbsd_request_dma(host, dma);
1529
1530         return 0;
1531 }
1532
1533 /*
1534  * Release all resources for the host.
1535  */
1536
1537 static void wbsd_release_resources(struct wbsd_host *host)
1538 {
1539         wbsd_release_dma(host);
1540         wbsd_release_irq(host);
1541         wbsd_release_regions(host);
1542 }
1543
1544 /*
1545  * Configure the resources the chip should use.
1546  */
1547
1548 static void wbsd_chip_config(struct wbsd_host *host)
1549 {
1550         wbsd_unlock_config(host);
1551
1552         /*
1553          * Reset the chip.
1554          */
1555         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1556         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1557
1558         /*
1559          * Select SD/MMC function.
1560          */
1561         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1562
1563         /*
1564          * Set up card detection.
1565          */
1566         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1567
1568         /*
1569          * Configure chip
1570          */
1571         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1572         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1573
1574         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1575
1576         if (host->dma >= 0)
1577                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1578
1579         /*
1580          * Enable and power up chip.
1581          */
1582         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1583         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1584
1585         wbsd_lock_config(host);
1586 }
1587
1588 /*
1589  * Check that configured resources are correct.
1590  */
1591
1592 static int wbsd_chip_validate(struct wbsd_host *host)
1593 {
1594         int base, irq, dma;
1595
1596         wbsd_unlock_config(host);
1597
1598         /*
1599          * Select SD/MMC function.
1600          */
1601         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1602
1603         /*
1604          * Read configuration.
1605          */
1606         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1607         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1608
1609         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1610
1611         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1612
1613         wbsd_lock_config(host);
1614
1615         /*
1616          * Validate against given configuration.
1617          */
1618         if (base != host->base)
1619                 return 0;
1620         if (irq != host->irq)
1621                 return 0;
1622         if ((dma != host->dma) && (host->dma != -1))
1623                 return 0;
1624
1625         return 1;
1626 }
1627
1628 /*
1629  * Powers down the SD function
1630  */
1631
1632 static void wbsd_chip_poweroff(struct wbsd_host *host)
1633 {
1634         wbsd_unlock_config(host);
1635
1636         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1637         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1638
1639         wbsd_lock_config(host);
1640 }
1641
1642 /*****************************************************************************\
1643  *                                                                           *
1644  * Devices setup and shutdown                                                *
1645  *                                                                           *
1646 \*****************************************************************************/
1647
1648 static int __devinit wbsd_init(struct device *dev, int base, int irq, int dma,
1649         int pnp)
1650 {
1651         struct wbsd_host *host = NULL;
1652         struct mmc_host *mmc = NULL;
1653         int ret;
1654
1655         ret = wbsd_alloc_mmc(dev);
1656         if (ret)
1657                 return ret;
1658
1659         mmc = dev_get_drvdata(dev);
1660         host = mmc_priv(mmc);
1661
1662         /*
1663          * Scan for hardware.
1664          */
1665         ret = wbsd_scan(host);
1666         if (ret) {
1667                 if (pnp && (ret == -ENODEV)) {
1668                         printk(KERN_WARNING DRIVER_NAME
1669                                 ": Unable to confirm device presence. You may "
1670                                 "experience lock-ups.\n");
1671                 } else {
1672                         wbsd_free_mmc(dev);
1673                         return ret;
1674                 }
1675         }
1676
1677         /*
1678          * Request resources.
1679          */
1680         ret = wbsd_request_resources(host, base, irq, dma);
1681         if (ret) {
1682                 wbsd_release_resources(host);
1683                 wbsd_free_mmc(dev);
1684                 return ret;
1685         }
1686
1687         /*
1688          * See if chip needs to be configured.
1689          */
1690         if (pnp) {
1691                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1692                         printk(KERN_WARNING DRIVER_NAME
1693                                 ": PnP active but chip not configured! "
1694                                 "You probably have a buggy BIOS. "
1695                                 "Configuring chip manually.\n");
1696                         wbsd_chip_config(host);
1697                 }
1698         } else
1699                 wbsd_chip_config(host);
1700
1701         /*
1702          * Power Management stuff. No idea how this works.
1703          * Not tested.
1704          */
1705 #ifdef CONFIG_PM
1706         if (host->config) {
1707                 wbsd_unlock_config(host);
1708                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1709                 wbsd_lock_config(host);
1710         }
1711 #endif
1712         /*
1713          * Allow device to initialise itself properly.
1714          */
1715         mdelay(5);
1716
1717         /*
1718          * Reset the chip into a known state.
1719          */
1720         wbsd_init_device(host);
1721
1722         mmc_add_host(mmc);
1723
1724         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1725         if (host->chip_id != 0)
1726                 printk(" id %x", (int)host->chip_id);
1727         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1728         if (host->dma >= 0)
1729                 printk(" dma %d", (int)host->dma);
1730         else
1731                 printk(" FIFO");
1732         if (pnp)
1733                 printk(" PnP");
1734         printk("\n");
1735
1736         return 0;
1737 }
1738
1739 static void __devexit wbsd_shutdown(struct device *dev, int pnp)
1740 {
1741         struct mmc_host *mmc = dev_get_drvdata(dev);
1742         struct wbsd_host *host;
1743
1744         if (!mmc)
1745                 return;
1746
1747         host = mmc_priv(mmc);
1748
1749         mmc_remove_host(mmc);
1750
1751         /*
1752          * Power down the SD/MMC function.
1753          */
1754         if (!pnp)
1755                 wbsd_chip_poweroff(host);
1756
1757         wbsd_release_resources(host);
1758
1759         wbsd_free_mmc(dev);
1760 }
1761
1762 /*
1763  * Non-PnP
1764  */
1765
1766 static int __devinit wbsd_probe(struct platform_device *dev)
1767 {
1768         /* Use the module parameters for resources */
1769         return wbsd_init(&dev->dev, io, irq, dma, 0);
1770 }
1771
1772 static int __devexit wbsd_remove(struct platform_device *dev)
1773 {
1774         wbsd_shutdown(&dev->dev, 0);
1775
1776         return 0;
1777 }
1778
1779 /*
1780  * PnP
1781  */
1782
1783 #ifdef CONFIG_PNP
1784
1785 static int __devinit
1786 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1787 {
1788         int io, irq, dma;
1789
1790         /*
1791          * Get resources from PnP layer.
1792          */
1793         io = pnp_port_start(pnpdev, 0);
1794         irq = pnp_irq(pnpdev, 0);
1795         if (pnp_dma_valid(pnpdev, 0))
1796                 dma = pnp_dma(pnpdev, 0);
1797         else
1798                 dma = -1;
1799
1800         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1801
1802         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1803 }
1804
1805 static void __devexit wbsd_pnp_remove(struct pnp_dev *dev)
1806 {
1807         wbsd_shutdown(&dev->dev, 1);
1808 }
1809
1810 #endif /* CONFIG_PNP */
1811
1812 /*
1813  * Power management
1814  */
1815
1816 #ifdef CONFIG_PM
1817
1818 static int wbsd_suspend(struct wbsd_host *host, pm_message_t state)
1819 {
1820         BUG_ON(host == NULL);
1821
1822         return mmc_suspend_host(host->mmc, state);
1823 }
1824
1825 static int wbsd_resume(struct wbsd_host *host)
1826 {
1827         BUG_ON(host == NULL);
1828
1829         wbsd_init_device(host);
1830
1831         return mmc_resume_host(host->mmc);
1832 }
1833
1834 static int wbsd_platform_suspend(struct platform_device *dev,
1835                                  pm_message_t state)
1836 {
1837         struct mmc_host *mmc = platform_get_drvdata(dev);
1838         struct wbsd_host *host;
1839         int ret;
1840
1841         if (mmc == NULL)
1842                 return 0;
1843
1844         DBGF("Suspending...\n");
1845
1846         host = mmc_priv(mmc);
1847
1848         ret = wbsd_suspend(host, state);
1849         if (ret)
1850                 return ret;
1851
1852         wbsd_chip_poweroff(host);
1853
1854         return 0;
1855 }
1856
1857 static int wbsd_platform_resume(struct platform_device *dev)
1858 {
1859         struct mmc_host *mmc = platform_get_drvdata(dev);
1860         struct wbsd_host *host;
1861
1862         if (mmc == NULL)
1863                 return 0;
1864
1865         DBGF("Resuming...\n");
1866
1867         host = mmc_priv(mmc);
1868
1869         wbsd_chip_config(host);
1870
1871         /*
1872          * Allow device to initialise itself properly.
1873          */
1874         mdelay(5);
1875
1876         return wbsd_resume(host);
1877 }
1878
1879 #ifdef CONFIG_PNP
1880
1881 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1882 {
1883         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1884         struct wbsd_host *host;
1885
1886         if (mmc == NULL)
1887                 return 0;
1888
1889         DBGF("Suspending...\n");
1890
1891         host = mmc_priv(mmc);
1892
1893         return wbsd_suspend(host, state);
1894 }
1895
1896 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1897 {
1898         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1899         struct wbsd_host *host;
1900
1901         if (mmc == NULL)
1902                 return 0;
1903
1904         DBGF("Resuming...\n");
1905
1906         host = mmc_priv(mmc);
1907
1908         /*
1909          * See if chip needs to be configured.
1910          */
1911         if (host->config != 0) {
1912                 if (!wbsd_chip_validate(host)) {
1913                         printk(KERN_WARNING DRIVER_NAME
1914                                 ": PnP active but chip not configured! "
1915                                 "You probably have a buggy BIOS. "
1916                                 "Configuring chip manually.\n");
1917                         wbsd_chip_config(host);
1918                 }
1919         }
1920
1921         /*
1922          * Allow device to initialise itself properly.
1923          */
1924         mdelay(5);
1925
1926         return wbsd_resume(host);
1927 }
1928
1929 #endif /* CONFIG_PNP */
1930
1931 #else /* CONFIG_PM */
1932
1933 #define wbsd_platform_suspend NULL
1934 #define wbsd_platform_resume NULL
1935
1936 #define wbsd_pnp_suspend NULL
1937 #define wbsd_pnp_resume NULL
1938
1939 #endif /* CONFIG_PM */
1940
1941 static struct platform_device *wbsd_device;
1942
1943 static struct platform_driver wbsd_driver = {
1944         .probe          = wbsd_probe,
1945         .remove         = __devexit_p(wbsd_remove),
1946
1947         .suspend        = wbsd_platform_suspend,
1948         .resume         = wbsd_platform_resume,
1949         .driver         = {
1950                 .name   = DRIVER_NAME,
1951         },
1952 };
1953
1954 #ifdef CONFIG_PNP
1955
1956 static struct pnp_driver wbsd_pnp_driver = {
1957         .name           = DRIVER_NAME,
1958         .id_table       = pnp_dev_table,
1959         .probe          = wbsd_pnp_probe,
1960         .remove         = __devexit_p(wbsd_pnp_remove),
1961
1962         .suspend        = wbsd_pnp_suspend,
1963         .resume         = wbsd_pnp_resume,
1964 };
1965
1966 #endif /* CONFIG_PNP */
1967
1968 /*
1969  * Module loading/unloading
1970  */
1971
1972 static int __init wbsd_drv_init(void)
1973 {
1974         int result;
1975
1976         printk(KERN_INFO DRIVER_NAME
1977                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1978         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1979
1980 #ifdef CONFIG_PNP
1981
1982         if (!nopnp) {
1983                 result = pnp_register_driver(&wbsd_pnp_driver);
1984                 if (result < 0)
1985                         return result;
1986         }
1987 #endif /* CONFIG_PNP */
1988
1989         if (nopnp) {
1990                 result = platform_driver_register(&wbsd_driver);
1991                 if (result < 0)
1992                         return result;
1993
1994                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1995                 if (!wbsd_device) {
1996                         platform_driver_unregister(&wbsd_driver);
1997                         return -ENOMEM;
1998                 }
1999
2000                 result = platform_device_add(wbsd_device);
2001                 if (result) {
2002                         platform_device_put(wbsd_device);
2003                         platform_driver_unregister(&wbsd_driver);
2004                         return result;
2005                 }
2006         }
2007
2008         return 0;
2009 }
2010
2011 static void __exit wbsd_drv_exit(void)
2012 {
2013 #ifdef CONFIG_PNP
2014
2015         if (!nopnp)
2016                 pnp_unregister_driver(&wbsd_pnp_driver);
2017
2018 #endif /* CONFIG_PNP */
2019
2020         if (nopnp) {
2021                 platform_device_unregister(wbsd_device);
2022
2023                 platform_driver_unregister(&wbsd_driver);
2024         }
2025
2026         DBG("unloaded\n");
2027 }
2028
2029 module_init(wbsd_drv_init);
2030 module_exit(wbsd_drv_exit);
2031 #ifdef CONFIG_PNP
2032 module_param(nopnp, uint, 0444);
2033 #endif
2034 module_param(io, uint, 0444);
2035 module_param(irq, uint, 0444);
2036 module_param(dma, int, 0444);
2037
2038 MODULE_LICENSE("GPL");
2039 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
2040 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2041
2042 #ifdef CONFIG_PNP
2043 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2044 #endif
2045 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2046 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2047 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");