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(unsigned long data)
 960 {
 961         struct wbsd_host *host = (struct wbsd_host *)data;
 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         init_timer(&host->ignore_timer);
1228         host->ignore_timer.data = (unsigned long)host;
1229         host->ignore_timer.function = wbsd_reset_ignore;
1230
1231         /*
1232          * Maximum number of segments. Worst case is one sector per segment
1233          * so this will be 64kB/512.
1234          */
1235         mmc->max_segs = 128;
1236
1237         /*
1238          * Maximum request size. Also limited by 64KiB buffer.
1239          */
1240         mmc->max_req_size = 65536;
1241
1242         /*
1243          * Maximum segment size. Could be one segment with the maximum number
1244          * of bytes.
1245          */
1246         mmc->max_seg_size = mmc->max_req_size;
1247
1248         /*
1249          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1250          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1251          */
1252         mmc->max_blk_size = 4087;
1253
1254         /*
1255          * Maximum block count. There is no real limit so the maximum
1256          * request size will be the only restriction.
1257          */
1258         mmc->max_blk_count = mmc->max_req_size;
1259
1260         dev_set_drvdata(dev, mmc);
1261
1262         return 0;
1263 }
1264
1265 static void wbsd_free_mmc(struct device *dev)
1266 {
1267         struct mmc_host *mmc;
1268         struct wbsd_host *host;
1269
1270         mmc = dev_get_drvdata(dev);
1271         if (!mmc)
1272                 return;
1273
1274         host = mmc_priv(mmc);
1275         BUG_ON(host == NULL);
1276
1277         del_timer_sync(&host->ignore_timer);
1278
1279         mmc_free_host(mmc);
1280
1281         dev_set_drvdata(dev, NULL);
1282 }
1283
1284 /*
1285  * Scan for known chip id:s
1286  */
1287
1288 static int wbsd_scan(struct wbsd_host *host)
1289 {
1290         int i, j, k;
1291         int id;
1292
1293         /*
1294          * Iterate through all ports, all codes to
1295          * find hardware that is in our known list.
1296          */
1297         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1298                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1299                         continue;
1300
1301                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1302                         id = 0xFFFF;
1303
1304                         host->config = config_ports[i];
1305                         host->unlock_code = unlock_codes[j];
1306
1307                         wbsd_unlock_config(host);
1308
1309                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1310                         id = inb(config_ports[i] + 1) << 8;
1311
1312                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1313                         id |= inb(config_ports[i] + 1);
1314
1315                         wbsd_lock_config(host);
1316
1317                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1318                                 if (id == valid_ids[k]) {
1319                                         host->chip_id = id;
1320
1321                                         return 0;
1322                                 }
1323                         }
1324
1325                         if (id != 0xFFFF) {
1326                                 DBG("Unknown hardware (id %x) found at %x\n",
1327                                         id, config_ports[i]);
1328                         }
1329                 }
1330
1331                 release_region(config_ports[i], 2);
1332         }
1333
1334         host->config = 0;
1335         host->unlock_code = 0;
1336
1337         return -ENODEV;
1338 }
1339
1340 /*
1341  * Allocate/free io port ranges
1342  */
1343
1344 static int wbsd_request_region(struct wbsd_host *host, int base)
1345 {
1346         if (base & 0x7)
1347                 return -EINVAL;
1348
1349         if (!request_region(base, 8, DRIVER_NAME))
1350                 return -EIO;
1351
1352         host->base = base;
1353
1354         return 0;
1355 }
1356
1357 static void wbsd_release_regions(struct wbsd_host *host)
1358 {
1359         if (host->base)
1360                 release_region(host->base, 8);
1361
1362         host->base = 0;
1363
1364         if (host->config)
1365                 release_region(host->config, 2);
1366
1367         host->config = 0;
1368 }
1369
1370 /*
1371  * Allocate/free DMA port and buffer
1372  */
1373
1374 static void wbsd_request_dma(struct wbsd_host *host, int dma)
1375 {
1376         if (dma < 0)
1377                 return;
1378
1379         if (request_dma(dma, DRIVER_NAME))
1380                 goto err;
1381
1382         /*
1383          * We need to allocate a special buffer in
1384          * order for ISA to be able to DMA to it.
1385          */
1386         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1387                 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1388         if (!host->dma_buffer)
1389                 goto free;
1390
1391         /*
1392          * Translate the address to a physical address.
1393          */
1394         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1395                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1396         if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1397                 goto kfree;
1398
1399         /*
1400          * ISA DMA must be aligned on a 64k basis.
1401          */
1402         if ((host->dma_addr & 0xffff) != 0)
1403                 goto unmap;
1404         /*
1405          * ISA cannot access memory above 16 MB.
1406          */
1407         else if (host->dma_addr >= 0x1000000)
1408                 goto unmap;
1409
1410         host->dma = dma;
1411
1412         return;
1413
1414 unmap:
1415         /*
1416          * If we've gotten here then there is some kind of alignment bug
1417          */
1418         BUG_ON(1);
1419
1420         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1421                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1422         host->dma_addr = 0;
1423
1424 kfree:
1425         kfree(host->dma_buffer);
1426         host->dma_buffer = NULL;
1427
1428 free:
1429         free_dma(dma);
1430
1431 err:
1432         pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1433                 dma);
1434 }
1435
1436 static void wbsd_release_dma(struct wbsd_host *host)
1437 {
1438         /*
1439          * host->dma_addr is valid here iff host->dma_buffer is not NULL.
1440          */
1441         if (host->dma_buffer) {
1442                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1443                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1444                 kfree(host->dma_buffer);
1445         }
1446         if (host->dma >= 0)
1447                 free_dma(host->dma);
1448
1449         host->dma = -1;
1450         host->dma_buffer = NULL;
1451         host->dma_addr = 0;
1452 }
1453
1454 /*
1455  * Allocate/free IRQ.
1456  */
1457
1458 static int wbsd_request_irq(struct wbsd_host *host, int irq)
1459 {
1460         int ret;
1461
1462         /*
1463          * Set up tasklets. Must be done before requesting interrupt.
1464          */
1465         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1466                         (unsigned long)host);
1467         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1468                         (unsigned long)host);
1469         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1470                         (unsigned long)host);
1471         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1472                         (unsigned long)host);
1473         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1474                         (unsigned long)host);
1475
1476         /*
1477          * Allocate interrupt.
1478          */
1479         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1480         if (ret)
1481                 return ret;
1482
1483         host->irq = irq;
1484
1485         return 0;
1486 }
1487
1488 static void  wbsd_release_irq(struct wbsd_host *host)
1489 {
1490         if (!host->irq)
1491                 return;
1492
1493         free_irq(host->irq, host);
1494
1495         host->irq = 0;
1496
1497         tasklet_kill(&host->card_tasklet);
1498         tasklet_kill(&host->fifo_tasklet);
1499         tasklet_kill(&host->crc_tasklet);
1500         tasklet_kill(&host->timeout_tasklet);
1501         tasklet_kill(&host->finish_tasklet);
1502 }
1503
1504 /*
1505  * Allocate all resources for the host.
1506  */
1507
1508 static int wbsd_request_resources(struct wbsd_host *host,
1509         int base, int irq, int dma)
1510 {
1511         int ret;
1512
1513         /*
1514          * Allocate I/O ports.
1515          */
1516         ret = wbsd_request_region(host, base);
1517         if (ret)
1518                 return ret;
1519
1520         /*
1521          * Allocate interrupt.
1522          */
1523         ret = wbsd_request_irq(host, irq);
1524         if (ret)
1525                 return ret;
1526
1527         /*
1528          * Allocate DMA.
1529          */
1530         wbsd_request_dma(host, dma);
1531
1532         return 0;
1533 }
1534
1535 /*
1536  * Release all resources for the host.
1537  */
1538
1539 static void wbsd_release_resources(struct wbsd_host *host)
1540 {
1541         wbsd_release_dma(host);
1542         wbsd_release_irq(host);
1543         wbsd_release_regions(host);
1544 }
1545
1546 /*
1547  * Configure the resources the chip should use.
1548  */
1549
1550 static void wbsd_chip_config(struct wbsd_host *host)
1551 {
1552         wbsd_unlock_config(host);
1553
1554         /*
1555          * Reset the chip.
1556          */
1557         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1558         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1559
1560         /*
1561          * Select SD/MMC function.
1562          */
1563         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1564
1565         /*
1566          * Set up card detection.
1567          */
1568         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1569
1570         /*
1571          * Configure chip
1572          */
1573         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1574         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1575
1576         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1577
1578         if (host->dma >= 0)
1579                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1580
1581         /*
1582          * Enable and power up chip.
1583          */
1584         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1585         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1586
1587         wbsd_lock_config(host);
1588 }
1589
1590 /*
1591  * Check that configured resources are correct.
1592  */
1593
1594 static int wbsd_chip_validate(struct wbsd_host *host)
1595 {
1596         int base, irq, dma;
1597
1598         wbsd_unlock_config(host);
1599
1600         /*
1601          * Select SD/MMC function.
1602          */
1603         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1604
1605         /*
1606          * Read configuration.
1607          */
1608         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1609         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1610
1611         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1612
1613         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1614
1615         wbsd_lock_config(host);
1616
1617         /*
1618          * Validate against given configuration.
1619          */
1620         if (base != host->base)
1621                 return 0;
1622         if (irq != host->irq)
1623                 return 0;
1624         if ((dma != host->dma) && (host->dma != -1))
1625                 return 0;
1626
1627         return 1;
1628 }
1629
1630 /*
1631  * Powers down the SD function
1632  */
1633
1634 static void wbsd_chip_poweroff(struct wbsd_host *host)
1635 {
1636         wbsd_unlock_config(host);
1637
1638         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1639         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1640
1641         wbsd_lock_config(host);
1642 }
1643
1644 /*****************************************************************************\
1645  *                                                                           *
1646  * Devices setup and shutdown                                                *
1647  *                                                                           *
1648 \*****************************************************************************/
1649
1650 static int wbsd_init(struct device *dev, int base, int irq, int dma,
1651         int pnp)
1652 {
1653         struct wbsd_host *host = NULL;
1654         struct mmc_host *mmc = NULL;
1655         int ret;
1656
1657         ret = wbsd_alloc_mmc(dev);
1658         if (ret)
1659                 return ret;
1660
1661         mmc = dev_get_drvdata(dev);
1662         host = mmc_priv(mmc);
1663
1664         /*
1665          * Scan for hardware.
1666          */
1667         ret = wbsd_scan(host);
1668         if (ret) {
1669                 if (pnp && (ret == -ENODEV)) {
1670                         pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1671                 } else {
1672                         wbsd_free_mmc(dev);
1673                         return ret;
1674                 }
1675         }
1676
1677         /*
1678          * Request resources.
1679          */
1680         ret = wbsd_request_resources(host, base, irq, dma);
1681         if (ret) {
1682                 wbsd_release_resources(host);
1683                 wbsd_free_mmc(dev);
1684                 return ret;
1685         }
1686
1687         /*
1688          * See if chip needs to be configured.
1689          */
1690         if (pnp) {
1691                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1692                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1693                         wbsd_chip_config(host);
1694                 }
1695         } else
1696                 wbsd_chip_config(host);
1697
1698         /*
1699          * Power Management stuff. No idea how this works.
1700          * Not tested.
1701          */
1702 #ifdef CONFIG_PM
1703         if (host->config) {
1704                 wbsd_unlock_config(host);
1705                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1706                 wbsd_lock_config(host);
1707         }
1708 #endif
1709         /*
1710          * Allow device to initialise itself properly.
1711          */
1712         mdelay(5);
1713
1714         /*
1715          * Reset the chip into a known state.
1716          */
1717         wbsd_init_device(host);
1718
1719         mmc_add_host(mmc);
1720
1721         pr_info("%s: W83L51xD", mmc_hostname(mmc));
1722         if (host->chip_id != 0)
1723                 printk(" id %x", (int)host->chip_id);
1724         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1725         if (host->dma >= 0)
1726                 printk(" dma %d", (int)host->dma);
1727         else
1728                 printk(" FIFO");
1729         if (pnp)
1730                 printk(" PnP");
1731         printk("\n");
1732
1733         return 0;
1734 }
1735
1736 static void wbsd_shutdown(struct device *dev, int pnp)
1737 {
1738         struct mmc_host *mmc = dev_get_drvdata(dev);
1739         struct wbsd_host *host;
1740
1741         if (!mmc)
1742                 return;
1743
1744         host = mmc_priv(mmc);
1745
1746         mmc_remove_host(mmc);
1747
1748         /*
1749          * Power down the SD/MMC function.
1750          */
1751         if (!pnp)
1752                 wbsd_chip_poweroff(host);
1753
1754         wbsd_release_resources(host);
1755
1756         wbsd_free_mmc(dev);
1757 }
1758
1759 /*
1760  * Non-PnP
1761  */
1762
1763 static int wbsd_probe(struct platform_device *dev)
1764 {
1765         /* Use the module parameters for resources */
1766         return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1767 }
1768
1769 static int wbsd_remove(struct platform_device *dev)
1770 {
1771         wbsd_shutdown(&dev->dev, 0);
1772
1773         return 0;
1774 }
1775
1776 /*
1777  * PnP
1778  */
1779
1780 #ifdef CONFIG_PNP
1781
1782 static int
1783 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1784 {
1785         int io, irq, dma;
1786
1787         /*
1788          * Get resources from PnP layer.
1789          */
1790         io = pnp_port_start(pnpdev, 0);
1791         irq = pnp_irq(pnpdev, 0);
1792         if (pnp_dma_valid(pnpdev, 0))
1793                 dma = pnp_dma(pnpdev, 0);
1794         else
1795                 dma = -1;
1796
1797         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1798
1799         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1800 }
1801
1802 static void wbsd_pnp_remove(struct pnp_dev *dev)
1803 {
1804         wbsd_shutdown(&dev->dev, 1);
1805 }
1806
1807 #endif /* CONFIG_PNP */
1808
1809 /*
1810  * Power management
1811  */
1812
1813 #ifdef CONFIG_PM
1814
1815 static int wbsd_platform_suspend(struct platform_device *dev,
1816                                  pm_message_t state)
1817 {
1818         struct mmc_host *mmc = platform_get_drvdata(dev);
1819         struct wbsd_host *host;
1820
1821         if (mmc == NULL)
1822                 return 0;
1823
1824         DBGF("Suspending...\n");
1825
1826         host = mmc_priv(mmc);
1827
1828         wbsd_chip_poweroff(host);
1829         return 0;
1830 }
1831
1832 static int wbsd_platform_resume(struct platform_device *dev)
1833 {
1834         struct mmc_host *mmc = platform_get_drvdata(dev);
1835         struct wbsd_host *host;
1836
1837         if (mmc == NULL)
1838                 return 0;
1839
1840         DBGF("Resuming...\n");
1841
1842         host = mmc_priv(mmc);
1843
1844         wbsd_chip_config(host);
1845
1846         /*
1847          * Allow device to initialise itself properly.
1848          */
1849         mdelay(5);
1850
1851         wbsd_init_device(host);
1852         return 0;
1853 }
1854
1855 #ifdef CONFIG_PNP
1856
1857 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1858 {
1859         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1860
1861         if (mmc == NULL)
1862                 return 0;
1863
1864         DBGF("Suspending...\n");
1865         return 0;
1866 }
1867
1868 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1869 {
1870         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1871         struct wbsd_host *host;
1872
1873         if (mmc == NULL)
1874                 return 0;
1875
1876         DBGF("Resuming...\n");
1877
1878         host = mmc_priv(mmc);
1879
1880         /*
1881          * See if chip needs to be configured.
1882          */
1883         if (host->config != 0) {
1884                 if (!wbsd_chip_validate(host)) {
1885                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1886                         wbsd_chip_config(host);
1887                 }
1888         }
1889
1890         /*
1891          * Allow device to initialise itself properly.
1892          */
1893         mdelay(5);
1894
1895         wbsd_init_device(host);
1896         return 0;
1897 }
1898
1899 #endif /* CONFIG_PNP */
1900
1901 #else /* CONFIG_PM */
1902
1903 #define wbsd_platform_suspend NULL
1904 #define wbsd_platform_resume NULL
1905
1906 #define wbsd_pnp_suspend NULL
1907 #define wbsd_pnp_resume NULL
1908
1909 #endif /* CONFIG_PM */
1910
1911 static struct platform_device *wbsd_device;
1912
1913 static struct platform_driver wbsd_driver = {
1914         .probe          = wbsd_probe,
1915         .remove         = wbsd_remove,
1916
1917         .suspend        = wbsd_platform_suspend,
1918         .resume         = wbsd_platform_resume,
1919         .driver         = {
1920                 .name   = DRIVER_NAME,
1921         },
1922 };
1923
1924 #ifdef CONFIG_PNP
1925
1926 static struct pnp_driver wbsd_pnp_driver = {
1927         .name           = DRIVER_NAME,
1928         .id_table       = pnp_dev_table,
1929         .probe          = wbsd_pnp_probe,
1930         .remove         = wbsd_pnp_remove,
1931
1932         .suspend        = wbsd_pnp_suspend,
1933         .resume         = wbsd_pnp_resume,
1934 };
1935
1936 #endif /* CONFIG_PNP */
1937
1938 /*
1939  * Module loading/unloading
1940  */
1941
1942 static int __init wbsd_drv_init(void)
1943 {
1944         int result;
1945
1946         pr_info(DRIVER_NAME
1947                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1948         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1949
1950 #ifdef CONFIG_PNP
1951
1952         if (!param_nopnp) {
1953                 result = pnp_register_driver(&wbsd_pnp_driver);
1954                 if (result < 0)
1955                         return result;
1956         }
1957 #endif /* CONFIG_PNP */
1958
1959         if (param_nopnp) {
1960                 result = platform_driver_register(&wbsd_driver);
1961                 if (result < 0)
1962                         return result;
1963
1964                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1965                 if (!wbsd_device) {
1966                         platform_driver_unregister(&wbsd_driver);
1967                         return -ENOMEM;
1968                 }
1969
1970                 result = platform_device_add(wbsd_device);
1971                 if (result) {
1972                         platform_device_put(wbsd_device);
1973                         platform_driver_unregister(&wbsd_driver);
1974                         return result;
1975                 }
1976         }
1977
1978         return 0;
1979 }
1980
1981 static void __exit wbsd_drv_exit(void)
1982 {
1983 #ifdef CONFIG_PNP
1984
1985         if (!param_nopnp)
1986                 pnp_unregister_driver(&wbsd_pnp_driver);
1987
1988 #endif /* CONFIG_PNP */
1989
1990         if (param_nopnp) {
1991                 platform_device_unregister(wbsd_device);
1992
1993                 platform_driver_unregister(&wbsd_driver);
1994         }
1995
1996         DBG("unloaded\n");
1997 }
1998
1999 module_init(wbsd_drv_init);
2000 module_exit(wbsd_drv_exit);
2001 #ifdef CONFIG_PNP
2002 module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
2003 #endif
2004 module_param_hw_named(io, param_io, uint, ioport, 0444);
2005 module_param_hw_named(irq, param_irq, uint, irq, 0444);
2006 module_param_hw_named(dma, param_dma, int, dma, 0444);
2007
2008 MODULE_LICENSE("GPL");
2009 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2010 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2011
2012 #ifdef CONFIG_PNP
2013 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2014 #endif
2015 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2016 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2017 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");