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