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   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
  37 #include <asm/io.h>
  38 #include <asm/dma.h>
  39 #include <asm/scatterlist.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 page_address(host->cur_sg->page) + host->cur_sg->offset;
 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 = page_address(sg[i].page) + sg[i].offset;
 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 = page_address(sg[i].page) + sg[i].offset;
 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 = MMC_ERR_INVALID;
 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 = MMC_ERR_INVALID;
 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 = MMC_ERR_NONE;
 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 = MMC_ERR_TIMEOUT;
 396                 /* Timeout? */
 397                 else if (isr & WBSD_INT_TIMEOUT)
 398                         cmd->error = MMC_ERR_TIMEOUT;
 399                 /* CRC? */
 400                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 401                         cmd->error = MMC_ERR_BADCRC;
 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 = MMC_ERR_INVALID;
 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 = MMC_ERR_INVALID;
 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 = MMC_ERR_NONE;
 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 == MMC_ERR_NONE)
 728                                 data->error = MMC_ERR_FAILED;
 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 != MMC_ERR_NONE) {
 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          * If there is no card in the slot then
 771          * timeout immediatly.
 772          */
 773         if (!(host->flags & WBSD_FCARD_PRESENT)) {
 774                 cmd->error = MMC_ERR_TIMEOUT;
 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                         printk(KERN_WARNING "%s: Data command %d is not "
 807                                 "supported by this controller.\n",
 808                                 mmc_hostname(host->mmc), cmd->opcode);
 809 #endif
 810                         cmd->error = MMC_ERR_INVALID;
 811
 812                         goto done;
 813                 };
 814         }
 815
 816         /*
 817          * Does the request include data?
 818          */
 819         if (cmd->data) {
 820                 wbsd_prepare_data(host, cmd->data);
 821
 822                 if (cmd->data->error != MMC_ERR_NONE)
 823                         goto done;
 824         }
 825
 826         wbsd_send_command(host, cmd);
 827
 828         /*
 829          * If this is a data transfer the request
 830          * will be finished after the data has
 831          * transfered.
 832          */
 833         if (cmd->data && (cmd->error == MMC_ERR_NONE)) {
 834                 /*
 835                  * Dirty fix for hardware bug.
 836                  */
 837                 if (host->dma == -1)
 838                         tasklet_schedule(&host->fifo_tasklet);
 839
 840                 spin_unlock_bh(&host->lock);
 841
 842                 return;
 843         }
 844
 845 done:
 846         wbsd_request_end(host, mrq);
 847
 848         spin_unlock_bh(&host->lock);
 849 }
 850
 851 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 852 {
 853         struct wbsd_host *host = mmc_priv(mmc);
 854         u8 clk, setup, pwr;
 855
 856         spin_lock_bh(&host->lock);
 857
 858         /*
 859          * Reset the chip on each power off.
 860          * Should clear out any weird states.
 861          */
 862         if (ios->power_mode == MMC_POWER_OFF)
 863                 wbsd_init_device(host);
 864
 865         if (ios->clock >= 24000000)
 866                 clk = WBSD_CLK_24M;
 867         else if (ios->clock >= 16000000)
 868                 clk = WBSD_CLK_16M;
 869         else if (ios->clock >= 12000000)
 870                 clk = WBSD_CLK_12M;
 871         else
 872                 clk = WBSD_CLK_375K;
 873
 874         /*
 875          * Only write to the clock register when
 876          * there is an actual change.
 877          */
 878         if (clk != host->clk) {
 879                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
 880                 host->clk = clk;
 881         }
 882
 883         /*
 884          * Power up card.
 885          */
 886         if (ios->power_mode != MMC_POWER_OFF) {
 887                 pwr = inb(host->base + WBSD_CSR);
 888                 pwr &= ~WBSD_POWER_N;
 889                 outb(pwr, host->base + WBSD_CSR);
 890         }
 891
 892         /*
 893          * MMC cards need to have pin 1 high during init.
 894          * It wreaks havoc with the card detection though so
 895          * that needs to be disabled.
 896          */
 897         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 898         if (ios->chip_select == MMC_CS_HIGH) {
 899                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
 900                 setup |= WBSD_DAT3_H;
 901                 host->flags |= WBSD_FIGNORE_DETECT;
 902         } else {
 903                 if (setup & WBSD_DAT3_H) {
 904                         setup &= ~WBSD_DAT3_H;
 905
 906                         /*
 907                          * We cannot resume card detection immediatly
 908                          * because of capacitance and delays in the chip.
 909                          */
 910                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
 911                 }
 912         }
 913         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 914
 915         /*
 916          * Store bus width for later. Will be used when
 917          * setting up the data transfer.
 918          */
 919         host->bus_width = ios->bus_width;
 920
 921         spin_unlock_bh(&host->lock);
 922 }
 923
 924 static int wbsd_get_ro(struct mmc_host *mmc)
 925 {
 926         struct wbsd_host *host = mmc_priv(mmc);
 927         u8 csr;
 928
 929         spin_lock_bh(&host->lock);
 930
 931         csr = inb(host->base + WBSD_CSR);
 932         csr |= WBSD_MSLED;
 933         outb(csr, host->base + WBSD_CSR);
 934
 935         mdelay(1);
 936
 937         csr = inb(host->base + WBSD_CSR);
 938         csr &= ~WBSD_MSLED;
 939         outb(csr, host->base + WBSD_CSR);
 940
 941         spin_unlock_bh(&host->lock);
 942
 943         return csr & WBSD_WRPT;
 944 }
 945
 946 static const struct mmc_host_ops wbsd_ops = {
 947         .request        = wbsd_request,
 948         .set_ios        = wbsd_set_ios,
 949         .get_ro         = wbsd_get_ro,
 950 };
 951
 952 /*****************************************************************************\
 953  *                                                                           *
 954  * Interrupt handling                                                        *
 955  *                                                                           *
 956 \*****************************************************************************/
 957
 958 /*
 959  * Helper function to reset detection ignore
 960  */
 961
 962 static void wbsd_reset_ignore(unsigned long data)
 963 {
 964         struct wbsd_host *host = (struct wbsd_host *)data;
 965
 966         BUG_ON(host == NULL);
 967
 968         DBG("Resetting card detection ignore\n");
 969
 970         spin_lock_bh(&host->lock);
 971
 972         host->flags &= ~WBSD_FIGNORE_DETECT;
 973
 974         /*
 975          * Card status might have changed during the
 976          * blackout.
 977          */
 978         tasklet_schedule(&host->card_tasklet);
 979
 980         spin_unlock_bh(&host->lock);
 981 }
 982
 983 /*
 984  * Tasklets
 985  */
 986
 987 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
 988 {
 989         WARN_ON(!host->mrq);
 990         if (!host->mrq)
 991                 return NULL;
 992
 993         WARN_ON(!host->mrq->cmd);
 994         if (!host->mrq->cmd)
 995                 return NULL;
 996
 997         WARN_ON(!host->mrq->cmd->data);
 998         if (!host->mrq->cmd->data)
 999                 return NULL;
1000
1001         return host->mrq->cmd->data;
1002 }
1003
1004 static void wbsd_tasklet_card(unsigned long param)
1005 {
1006         struct wbsd_host *host = (struct wbsd_host *)param;
1007         u8 csr;
1008         int delay = -1;
1009
1010         spin_lock(&host->lock);
1011
1012         if (host->flags & WBSD_FIGNORE_DETECT) {
1013                 spin_unlock(&host->lock);
1014                 return;
1015         }
1016
1017         csr = inb(host->base + WBSD_CSR);
1018         WARN_ON(csr == 0xff);
1019
1020         if (csr & WBSD_CARDPRESENT) {
1021                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1022                         DBG("Card inserted\n");
1023                         host->flags |= WBSD_FCARD_PRESENT;
1024
1025                         delay = 500;
1026                 }
1027         } else if (host->flags & WBSD_FCARD_PRESENT) {
1028                 DBG("Card removed\n");
1029                 host->flags &= ~WBSD_FCARD_PRESENT;
1030
1031                 if (host->mrq) {
1032                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1033                                 mmc_hostname(host->mmc));
1034                         wbsd_reset(host);
1035
1036                         host->mrq->cmd->error = MMC_ERR_FAILED;
1037                         tasklet_schedule(&host->finish_tasklet);
1038                 }
1039
1040                 delay = 0;
1041         }
1042
1043         /*
1044          * Unlock first since we might get a call back.
1045          */
1046
1047         spin_unlock(&host->lock);
1048
1049         if (delay != -1)
1050                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1051 }
1052
1053 static void wbsd_tasklet_fifo(unsigned long param)
1054 {
1055         struct wbsd_host *host = (struct wbsd_host *)param;
1056         struct mmc_data *data;
1057
1058         spin_lock(&host->lock);
1059
1060         if (!host->mrq)
1061                 goto end;
1062
1063         data = wbsd_get_data(host);
1064         if (!data)
1065                 goto end;
1066
1067         if (data->flags & MMC_DATA_WRITE)
1068                 wbsd_fill_fifo(host);
1069         else
1070                 wbsd_empty_fifo(host);
1071
1072         /*
1073          * Done?
1074          */
1075         if (host->num_sg == 0) {
1076                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1077                 tasklet_schedule(&host->finish_tasklet);
1078         }
1079
1080 end:
1081         spin_unlock(&host->lock);
1082 }
1083
1084 static void wbsd_tasklet_crc(unsigned long param)
1085 {
1086         struct wbsd_host *host = (struct wbsd_host *)param;
1087         struct mmc_data *data;
1088
1089         spin_lock(&host->lock);
1090
1091         if (!host->mrq)
1092                 goto end;
1093
1094         data = wbsd_get_data(host);
1095         if (!data)
1096                 goto end;
1097
1098         DBGF("CRC error\n");
1099
1100         data->error = MMC_ERR_BADCRC;
1101
1102         tasklet_schedule(&host->finish_tasklet);
1103
1104 end:
1105         spin_unlock(&host->lock);
1106 }
1107
1108 static void wbsd_tasklet_timeout(unsigned long param)
1109 {
1110         struct wbsd_host *host = (struct wbsd_host *)param;
1111         struct mmc_data *data;
1112
1113         spin_lock(&host->lock);
1114
1115         if (!host->mrq)
1116                 goto end;
1117
1118         data = wbsd_get_data(host);
1119         if (!data)
1120                 goto end;
1121
1122         DBGF("Timeout\n");
1123
1124         data->error = MMC_ERR_TIMEOUT;
1125
1126         tasklet_schedule(&host->finish_tasklet);
1127
1128 end:
1129         spin_unlock(&host->lock);
1130 }
1131
1132 static void wbsd_tasklet_finish(unsigned long param)
1133 {
1134         struct wbsd_host *host = (struct wbsd_host *)param;
1135         struct mmc_data *data;
1136
1137         spin_lock(&host->lock);
1138
1139         WARN_ON(!host->mrq);
1140         if (!host->mrq)
1141                 goto end;
1142
1143         data = wbsd_get_data(host);
1144         if (!data)
1145                 goto end;
1146
1147         wbsd_finish_data(host, data);
1148
1149 end:
1150         spin_unlock(&host->lock);
1151 }
1152
1153 /*
1154  * Interrupt handling
1155  */
1156
1157 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1158 {
1159         struct wbsd_host *host = dev_id;
1160         int isr;
1161
1162         isr = inb(host->base + WBSD_ISR);
1163
1164         /*
1165          * Was it actually our hardware that caused the interrupt?
1166          */
1167         if (isr == 0xff || isr == 0x00)
1168                 return IRQ_NONE;
1169
1170         host->isr |= isr;
1171
1172         /*
1173          * Schedule tasklets as needed.
1174          */
1175         if (isr & WBSD_INT_CARD)
1176                 tasklet_schedule(&host->card_tasklet);
1177         if (isr & WBSD_INT_FIFO_THRE)
1178                 tasklet_schedule(&host->fifo_tasklet);
1179         if (isr & WBSD_INT_CRC)
1180                 tasklet_hi_schedule(&host->crc_tasklet);
1181         if (isr & WBSD_INT_TIMEOUT)
1182                 tasklet_hi_schedule(&host->timeout_tasklet);
1183         if (isr & WBSD_INT_TC)
1184                 tasklet_schedule(&host->finish_tasklet);
1185
1186         return IRQ_HANDLED;
1187 }
1188
1189 /*****************************************************************************\
1190  *                                                                           *
1191  * Device initialisation and shutdown                                        *
1192  *                                                                           *
1193 \*****************************************************************************/
1194
1195 /*
1196  * Allocate/free MMC structure.
1197  */
1198
1199 static int __devinit wbsd_alloc_mmc(struct device *dev)
1200 {
1201         struct mmc_host *mmc;
1202         struct wbsd_host *host;
1203
1204         /*
1205          * Allocate MMC structure.
1206          */
1207         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1208         if (!mmc)
1209                 return -ENOMEM;
1210
1211         host = mmc_priv(mmc);
1212         host->mmc = mmc;
1213
1214         host->dma = -1;
1215
1216         /*
1217          * Set host parameters.
1218          */
1219         mmc->ops = &wbsd_ops;
1220         mmc->f_min = 375000;
1221         mmc->f_max = 24000000;
1222         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1223         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1224
1225         spin_lock_init(&host->lock);
1226
1227         /*
1228          * Set up timers
1229          */
1230         init_timer(&host->ignore_timer);
1231         host->ignore_timer.data = (unsigned long)host;
1232         host->ignore_timer.function = wbsd_reset_ignore;
1233
1234         /*
1235          * Maximum number of segments. Worst case is one sector per segment
1236          * so this will be 64kB/512.
1237          */
1238         mmc->max_hw_segs = 128;
1239         mmc->max_phys_segs = 128;
1240
1241         /*
1242          * Maximum request size. Also limited by 64KiB buffer.
1243          */
1244         mmc->max_req_size = 65536;
1245
1246         /*
1247          * Maximum segment size. Could be one segment with the maximum number
1248          * of bytes.
1249          */
1250         mmc->max_seg_size = mmc->max_req_size;
1251
1252         /*
1253          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1254          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1255          */
1256         mmc->max_blk_size = 4087;
1257
1258         /*
1259          * Maximum block count. There is no real limit so the maximum
1260          * request size will be the only restriction.
1261          */
1262         mmc->max_blk_count = mmc->max_req_size;
1263
1264         dev_set_drvdata(dev, mmc);
1265
1266         return 0;
1267 }
1268
1269 static void wbsd_free_mmc(struct device *dev)
1270 {
1271         struct mmc_host *mmc;
1272         struct wbsd_host *host;
1273
1274         mmc = dev_get_drvdata(dev);
1275         if (!mmc)
1276                 return;
1277
1278         host = mmc_priv(mmc);
1279         BUG_ON(host == NULL);
1280
1281         del_timer_sync(&host->ignore_timer);
1282
1283         mmc_free_host(mmc);
1284
1285         dev_set_drvdata(dev, NULL);
1286 }
1287
1288 /*
1289  * Scan for known chip id:s
1290  */
1291
1292 static int __devinit wbsd_scan(struct wbsd_host *host)
1293 {
1294         int i, j, k;
1295         int id;
1296
1297         /*
1298          * Iterate through all ports, all codes to
1299          * find hardware that is in our known list.
1300          */
1301         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1302                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1303                         continue;
1304
1305                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1306                         id = 0xFFFF;
1307
1308                         host->config = config_ports[i];
1309                         host->unlock_code = unlock_codes[j];
1310
1311                         wbsd_unlock_config(host);
1312
1313                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1314                         id = inb(config_ports[i] + 1) << 8;
1315
1316                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1317                         id |= inb(config_ports[i] + 1);
1318
1319                         wbsd_lock_config(host);
1320
1321                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1322                                 if (id == valid_ids[k]) {
1323                                         host->chip_id = id;
1324
1325                                         return 0;
1326                                 }
1327                         }
1328
1329                         if (id != 0xFFFF) {
1330                                 DBG("Unknown hardware (id %x) found at %x\n",
1331                                         id, config_ports[i]);
1332                         }
1333                 }
1334
1335                 release_region(config_ports[i], 2);
1336         }
1337
1338         host->config = 0;
1339         host->unlock_code = 0;
1340
1341         return -ENODEV;
1342 }
1343
1344 /*
1345  * Allocate/free io port ranges
1346  */
1347
1348 static int __devinit wbsd_request_region(struct wbsd_host *host, int base)
1349 {
1350         if (base & 0x7)
1351                 return -EINVAL;
1352
1353         if (!request_region(base, 8, DRIVER_NAME))
1354                 return -EIO;
1355
1356         host->base = base;
1357
1358         return 0;
1359 }
1360
1361 static void wbsd_release_regions(struct wbsd_host *host)
1362 {
1363         if (host->base)
1364                 release_region(host->base, 8);
1365
1366         host->base = 0;
1367
1368         if (host->config)
1369                 release_region(host->config, 2);
1370
1371         host->config = 0;
1372 }
1373
1374 /*
1375  * Allocate/free DMA port and buffer
1376  */
1377
1378 static void __devinit wbsd_request_dma(struct wbsd_host *host, int dma)
1379 {
1380         if (dma < 0)
1381                 return;
1382
1383         if (request_dma(dma, DRIVER_NAME))
1384                 goto err;
1385
1386         /*
1387          * We need to allocate a special buffer in
1388          * order for ISA to be able to DMA to it.
1389          */
1390         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1391                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1392         if (!host->dma_buffer)
1393                 goto free;
1394
1395         /*
1396          * Translate the address to a physical address.
1397          */
1398         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1399                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1400
1401         /*
1402          * ISA DMA must be aligned on a 64k basis.
1403          */
1404         if ((host->dma_addr & 0xffff) != 0)
1405                 goto kfree;
1406         /*
1407          * ISA cannot access memory above 16 MB.
1408          */
1409         else if (host->dma_addr >= 0x1000000)
1410                 goto kfree;
1411
1412         host->dma = dma;
1413
1414         return;
1415
1416 kfree:
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 = (dma_addr_t)NULL;
1425
1426         kfree(host->dma_buffer);
1427         host->dma_buffer = NULL;
1428
1429 free:
1430         free_dma(dma);
1431
1432 err:
1433         printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
1434                 "Falling back on FIFO.\n", dma);
1435 }
1436
1437 static void wbsd_release_dma(struct wbsd_host *host)
1438 {
1439         if (host->dma_addr) {
1440                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1441                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1442         }
1443         kfree(host->dma_buffer);
1444         if (host->dma >= 0)
1445                 free_dma(host->dma);
1446
1447         host->dma = -1;
1448         host->dma_buffer = NULL;
1449         host->dma_addr = (dma_addr_t)NULL;
1450 }
1451
1452 /*
1453  * Allocate/free IRQ.
1454  */
1455
1456 static int __devinit wbsd_request_irq(struct wbsd_host *host, int irq)
1457 {
1458         int ret;
1459
1460         /*
1461          * Allocate interrupt.
1462          */
1463
1464         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1465         if (ret)
1466                 return ret;
1467
1468         host->irq = irq;
1469
1470         /*
1471          * Set up tasklets.
1472          */
1473         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1474                         (unsigned long)host);
1475         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1476                         (unsigned long)host);
1477         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1478                         (unsigned long)host);
1479         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1480                         (unsigned long)host);
1481         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1482                         (unsigned long)host);
1483
1484         return 0;
1485 }
1486
1487 static void  wbsd_release_irq(struct wbsd_host *host)
1488 {
1489         if (!host->irq)
1490                 return;
1491
1492         free_irq(host->irq, host);
1493
1494         host->irq = 0;
1495
1496         tasklet_kill(&host->card_tasklet);
1497         tasklet_kill(&host->fifo_tasklet);
1498         tasklet_kill(&host->crc_tasklet);
1499         tasklet_kill(&host->timeout_tasklet);
1500         tasklet_kill(&host->finish_tasklet);
1501 }
1502
1503 /*
1504  * Allocate all resources for the host.
1505  */
1506
1507 static int __devinit wbsd_request_resources(struct wbsd_host *host,
1508         int base, int irq, int dma)
1509 {
1510         int ret;
1511
1512         /*
1513          * Allocate I/O ports.
1514          */
1515         ret = wbsd_request_region(host, base);
1516         if (ret)
1517                 return ret;
1518
1519         /*
1520          * Allocate interrupt.
1521          */
1522         ret = wbsd_request_irq(host, irq);
1523         if (ret)
1524                 return ret;
1525
1526         /*
1527          * Allocate DMA.
1528          */
1529         wbsd_request_dma(host, dma);
1530
1531         return 0;
1532 }
1533
1534 /*
1535  * Release all resources for the host.
1536  */
1537
1538 static void wbsd_release_resources(struct wbsd_host *host)
1539 {
1540         wbsd_release_dma(host);
1541         wbsd_release_irq(host);
1542         wbsd_release_regions(host);
1543 }
1544
1545 /*
1546  * Configure the resources the chip should use.
1547  */
1548
1549 static void wbsd_chip_config(struct wbsd_host *host)
1550 {
1551         wbsd_unlock_config(host);
1552
1553         /*
1554          * Reset the chip.
1555          */
1556         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1557         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1558
1559         /*
1560          * Select SD/MMC function.
1561          */
1562         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1563
1564         /*
1565          * Set up card detection.
1566          */
1567         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1568
1569         /*
1570          * Configure chip
1571          */
1572         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1573         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1574
1575         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1576
1577         if (host->dma >= 0)
1578                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1579
1580         /*
1581          * Enable and power up chip.
1582          */
1583         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1584         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1585
1586         wbsd_lock_config(host);
1587 }
1588
1589 /*
1590  * Check that configured resources are correct.
1591  */
1592
1593 static int wbsd_chip_validate(struct wbsd_host *host)
1594 {
1595         int base, irq, dma;
1596
1597         wbsd_unlock_config(host);
1598
1599         /*
1600          * Select SD/MMC function.
1601          */
1602         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1603
1604         /*
1605          * Read configuration.
1606          */
1607         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1608         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1609
1610         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1611
1612         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1613
1614         wbsd_lock_config(host);
1615
1616         /*
1617          * Validate against given configuration.
1618          */
1619         if (base != host->base)
1620                 return 0;
1621         if (irq != host->irq)
1622                 return 0;
1623         if ((dma != host->dma) && (host->dma != -1))
1624                 return 0;
1625
1626         return 1;
1627 }
1628
1629 /*
1630  * Powers down the SD function
1631  */
1632
1633 static void wbsd_chip_poweroff(struct wbsd_host *host)
1634 {
1635         wbsd_unlock_config(host);
1636
1637         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1638         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1639
1640         wbsd_lock_config(host);
1641 }
1642
1643 /*****************************************************************************\
1644  *                                                                           *
1645  * Devices setup and shutdown                                                *
1646  *                                                                           *
1647 \*****************************************************************************/
1648
1649 static int __devinit wbsd_init(struct device *dev, int base, int irq, int dma,
1650         int pnp)
1651 {
1652         struct wbsd_host *host = NULL;
1653         struct mmc_host *mmc = NULL;
1654         int ret;
1655
1656         ret = wbsd_alloc_mmc(dev);
1657         if (ret)
1658                 return ret;
1659
1660         mmc = dev_get_drvdata(dev);
1661         host = mmc_priv(mmc);
1662
1663         /*
1664          * Scan for hardware.
1665          */
1666         ret = wbsd_scan(host);
1667         if (ret) {
1668                 if (pnp && (ret == -ENODEV)) {
1669                         printk(KERN_WARNING DRIVER_NAME
1670                                 ": Unable to confirm device presence. You may "
1671                                 "experience lock-ups.\n");
1672                 } else {
1673                         wbsd_free_mmc(dev);
1674                         return ret;
1675                 }
1676         }
1677
1678         /*
1679          * Request resources.
1680          */
1681         ret = wbsd_request_resources(host, base, irq, dma);
1682         if (ret) {
1683                 wbsd_release_resources(host);
1684                 wbsd_free_mmc(dev);
1685                 return ret;
1686         }
1687
1688         /*
1689          * See if chip needs to be configured.
1690          */
1691         if (pnp) {
1692                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1693                         printk(KERN_WARNING DRIVER_NAME
1694                                 ": PnP active but chip not configured! "
1695                                 "You probably have a buggy BIOS. "
1696                                 "Configuring chip manually.\n");
1697                         wbsd_chip_config(host);
1698                 }
1699         } else
1700                 wbsd_chip_config(host);
1701
1702         /*
1703          * Power Management stuff. No idea how this works.
1704          * Not tested.
1705          */
1706 #ifdef CONFIG_PM
1707         if (host->config) {
1708                 wbsd_unlock_config(host);
1709                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1710                 wbsd_lock_config(host);
1711         }
1712 #endif
1713         /*
1714          * Allow device to initialise itself properly.
1715          */
1716         mdelay(5);
1717
1718         /*
1719          * Reset the chip into a known state.
1720          */
1721         wbsd_init_device(host);
1722
1723         mmc_add_host(mmc);
1724
1725         printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
1726         if (host->chip_id != 0)
1727                 printk(" id %x", (int)host->chip_id);
1728         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1729         if (host->dma >= 0)
1730                 printk(" dma %d", (int)host->dma);
1731         else
1732                 printk(" FIFO");
1733         if (pnp)
1734                 printk(" PnP");
1735         printk("\n");
1736
1737         return 0;
1738 }
1739
1740 static void __devexit wbsd_shutdown(struct device *dev, int pnp)
1741 {
1742         struct mmc_host *mmc = dev_get_drvdata(dev);
1743         struct wbsd_host *host;
1744
1745         if (!mmc)
1746                 return;
1747
1748         host = mmc_priv(mmc);
1749
1750         mmc_remove_host(mmc);
1751
1752         /*
1753          * Power down the SD/MMC function.
1754          */
1755         if (!pnp)
1756                 wbsd_chip_poweroff(host);
1757
1758         wbsd_release_resources(host);
1759
1760         wbsd_free_mmc(dev);
1761 }
1762
1763 /*
1764  * Non-PnP
1765  */
1766
1767 static int __devinit wbsd_probe(struct platform_device *dev)
1768 {
1769         /* Use the module parameters for resources */
1770         return wbsd_init(&dev->dev, io, irq, dma, 0);
1771 }
1772
1773 static int __devexit wbsd_remove(struct platform_device *dev)
1774 {
1775         wbsd_shutdown(&dev->dev, 0);
1776
1777         return 0;
1778 }
1779
1780 /*
1781  * PnP
1782  */
1783
1784 #ifdef CONFIG_PNP
1785
1786 static int __devinit
1787 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1788 {
1789         int io, irq, dma;
1790
1791         /*
1792          * Get resources from PnP layer.
1793          */
1794         io = pnp_port_start(pnpdev, 0);
1795         irq = pnp_irq(pnpdev, 0);
1796         if (pnp_dma_valid(pnpdev, 0))
1797                 dma = pnp_dma(pnpdev, 0);
1798         else
1799                 dma = -1;
1800
1801         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1802
1803         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1804 }
1805
1806 static void __devexit wbsd_pnp_remove(struct pnp_dev *dev)
1807 {
1808         wbsd_shutdown(&dev->dev, 1);
1809 }
1810
1811 #endif /* CONFIG_PNP */
1812
1813 /*
1814  * Power management
1815  */
1816
1817 #ifdef CONFIG_PM
1818
1819 static int wbsd_suspend(struct wbsd_host *host, pm_message_t state)
1820 {
1821         BUG_ON(host == NULL);
1822
1823         return mmc_suspend_host(host->mmc, state);
1824 }
1825
1826 static int wbsd_resume(struct wbsd_host *host)
1827 {
1828         BUG_ON(host == NULL);
1829
1830         wbsd_init_device(host);
1831
1832         return mmc_resume_host(host->mmc);
1833 }
1834
1835 static int wbsd_platform_suspend(struct platform_device *dev,
1836                                  pm_message_t state)
1837 {
1838         struct mmc_host *mmc = platform_get_drvdata(dev);
1839         struct wbsd_host *host;
1840         int ret;
1841
1842         if (mmc == NULL)
1843                 return 0;
1844
1845         DBGF("Suspending...\n");
1846
1847         host = mmc_priv(mmc);
1848
1849         ret = wbsd_suspend(host, state);
1850         if (ret)
1851                 return ret;
1852
1853         wbsd_chip_poweroff(host);
1854
1855         return 0;
1856 }
1857
1858 static int wbsd_platform_resume(struct platform_device *dev)
1859 {
1860         struct mmc_host *mmc = platform_get_drvdata(dev);
1861         struct wbsd_host *host;
1862
1863         if (mmc == NULL)
1864                 return 0;
1865
1866         DBGF("Resuming...\n");
1867
1868         host = mmc_priv(mmc);
1869
1870         wbsd_chip_config(host);
1871
1872         /*
1873          * Allow device to initialise itself properly.
1874          */
1875         mdelay(5);
1876
1877         return wbsd_resume(host);
1878 }
1879
1880 #ifdef CONFIG_PNP
1881
1882 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1883 {
1884         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1885         struct wbsd_host *host;
1886
1887         if (mmc == NULL)
1888                 return 0;
1889
1890         DBGF("Suspending...\n");
1891
1892         host = mmc_priv(mmc);
1893
1894         return wbsd_suspend(host, state);
1895 }
1896
1897 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1898 {
1899         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1900         struct wbsd_host *host;
1901
1902         if (mmc == NULL)
1903                 return 0;
1904
1905         DBGF("Resuming...\n");
1906
1907         host = mmc_priv(mmc);
1908
1909         /*
1910          * See if chip needs to be configured.
1911          */
1912         if (host->config != 0) {
1913                 if (!wbsd_chip_validate(host)) {
1914                         printk(KERN_WARNING DRIVER_NAME
1915                                 ": PnP active but chip not configured! "
1916                                 "You probably have a buggy BIOS. "
1917                                 "Configuring chip manually.\n");
1918                         wbsd_chip_config(host);
1919                 }
1920         }
1921
1922         /*
1923          * Allow device to initialise itself properly.
1924          */
1925         mdelay(5);
1926
1927         return wbsd_resume(host);
1928 }
1929
1930 #endif /* CONFIG_PNP */
1931
1932 #else /* CONFIG_PM */
1933
1934 #define wbsd_platform_suspend NULL
1935 #define wbsd_platform_resume NULL
1936
1937 #define wbsd_pnp_suspend NULL
1938 #define wbsd_pnp_resume NULL
1939
1940 #endif /* CONFIG_PM */
1941
1942 static struct platform_device *wbsd_device;
1943
1944 static struct platform_driver wbsd_driver = {
1945         .probe          = wbsd_probe,
1946         .remove         = __devexit_p(wbsd_remove),
1947
1948         .suspend        = wbsd_platform_suspend,
1949         .resume         = wbsd_platform_resume,
1950         .driver         = {
1951                 .name   = DRIVER_NAME,
1952         },
1953 };
1954
1955 #ifdef CONFIG_PNP
1956
1957 static struct pnp_driver wbsd_pnp_driver = {
1958         .name           = DRIVER_NAME,
1959         .id_table       = pnp_dev_table,
1960         .probe          = wbsd_pnp_probe,
1961         .remove         = __devexit_p(wbsd_pnp_remove),
1962
1963         .suspend        = wbsd_pnp_suspend,
1964         .resume         = wbsd_pnp_resume,
1965 };
1966
1967 #endif /* CONFIG_PNP */
1968
1969 /*
1970  * Module loading/unloading
1971  */
1972
1973 static int __init wbsd_drv_init(void)
1974 {
1975         int result;
1976
1977         printk(KERN_INFO DRIVER_NAME
1978                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1979         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1980
1981 #ifdef CONFIG_PNP
1982
1983         if (!nopnp) {
1984                 result = pnp_register_driver(&wbsd_pnp_driver);
1985                 if (result < 0)
1986                         return result;
1987         }
1988 #endif /* CONFIG_PNP */
1989
1990         if (nopnp) {
1991                 result = platform_driver_register(&wbsd_driver);
1992                 if (result < 0)
1993                         return result;
1994
1995                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1996                 if (!wbsd_device) {
1997                         platform_driver_unregister(&wbsd_driver);
1998                         return -ENOMEM;
1999                 }
2000
2001                 result = platform_device_add(wbsd_device);
2002                 if (result) {
2003                         platform_device_put(wbsd_device);
2004                         platform_driver_unregister(&wbsd_driver);
2005                         return result;
2006                 }
2007         }
2008
2009         return 0;
2010 }
2011
2012 static void __exit wbsd_drv_exit(void)
2013 {
2014 #ifdef CONFIG_PNP
2015
2016         if (!nopnp)
2017                 pnp_unregister_driver(&wbsd_pnp_driver);
2018
2019 #endif /* CONFIG_PNP */
2020
2021         if (nopnp) {
2022                 platform_device_unregister(wbsd_device);
2023
2024                 platform_driver_unregister(&wbsd_driver);
2025         }
2026
2027         DBG("unloaded\n");
2028 }
2029
2030 module_init(wbsd_drv_init);
2031 module_exit(wbsd_drv_exit);
2032 #ifdef CONFIG_PNP
2033 module_param(nopnp, uint, 0444);
2034 #endif
2035 module_param(io, uint, 0444);
2036 module_param(irq, uint, 0444);
2037 module_param(dma, int, 0444);
2038
2039 MODULE_LICENSE("GPL");
2040 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
2041 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2042
2043 #ifdef CONFIG_PNP
2044 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2045 #endif
2046 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2047 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2048 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");