drivers/mmc/host/wbsd.c

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