drivers/mmc/host/wbsd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
   4  *
   5  *  Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved.
   6  *
   7  * Warning!
   8  *
   9  * Changes to the FIFO system should be done with extreme care since
  10  * the hardware is full of bugs related to the FIFO. Known issues are:
  11  *
  12  * - FIFO size field in FSR is always zero.
  13  *
  14  * - FIFO interrupts tend not to work as they should. Interrupts are
  15  *   triggered only for full/empty events, not for threshold values.
  16  *
  17  * - On APIC systems the FIFO empty interrupt is sometimes lost.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/delay.h>
  28 #include <linux/pnp.h>
  29 #include <linux/highmem.h>
  30 #include <linux/mmc/host.h>
  31 #include <linux/mmc/mmc.h>
  32 #include <linux/mmc/sd.h>
  33 #include <linux/scatterlist.h>
  34 #include <linux/slab.h>
  35
  36 #include <asm/io.h>
  37 #include <asm/dma.h>
  38
  39 #include "wbsd.h"
  40
  41 #define DRIVER_NAME "wbsd"
  42
  43 #define DBG(x...) \
  44         pr_debug(DRIVER_NAME ": " x)
  45 #define DBGF(f, x...) \
  46         pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
  47
  48 /*
  49  * Device resources
  50  */
  51
  52 #ifdef CONFIG_PNP
  53
  54 static const struct pnp_device_id pnp_dev_table[] = {
  55         { "WEC0517", 0 },
  56         { "WEC0518", 0 },
  57         { "", 0 },
  58 };
  59
  60 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
  61
  62 #endif /* CONFIG_PNP */
  63
  64 static const int config_ports[] = { 0x2E, 0x4E };
  65 static const int unlock_codes[] = { 0x83, 0x87 };
  66
  67 static const int valid_ids[] = {
  68         0x7112,
  69 };
  70
  71 #ifdef CONFIG_PNP
  72 static unsigned int param_nopnp = 0;
  73 #else
  74 static const unsigned int param_nopnp = 1;
  75 #endif
  76 static unsigned int param_io = 0x248;
  77 static unsigned int param_irq = 6;
  78 static int param_dma = 2;
  79
  80 /*
  81  * Basic functions
  82  */
  83
  84 static inline void wbsd_unlock_config(struct wbsd_host *host)
  85 {
  86         BUG_ON(host->config == 0);
  87
  88         outb(host->unlock_code, host->config);
  89         outb(host->unlock_code, host->config);
  90 }
  91
  92 static inline void wbsd_lock_config(struct wbsd_host *host)
  93 {
  94         BUG_ON(host->config == 0);
  95
  96         outb(LOCK_CODE, host->config);
  97 }
  98
  99 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
 100 {
 101         BUG_ON(host->config == 0);
 102
 103         outb(reg, host->config);
 104         outb(value, host->config + 1);
 105 }
 106
 107 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
 108 {
 109         BUG_ON(host->config == 0);
 110
 111         outb(reg, host->config);
 112         return inb(host->config + 1);
 113 }
 114
 115 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
 116 {
 117         outb(index, host->base + WBSD_IDXR);
 118         outb(value, host->base + WBSD_DATAR);
 119 }
 120
 121 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
 122 {
 123         outb(index, host->base + WBSD_IDXR);
 124         return inb(host->base + WBSD_DATAR);
 125 }
 126
 127 /*
 128  * Common routines
 129  */
 130
 131 static void wbsd_init_device(struct wbsd_host *host)
 132 {
 133         u8 setup, ier;
 134
 135         /*
 136          * Reset chip (SD/MMC part) and fifo.
 137          */
 138         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 139         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
 140         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 141
 142         /*
 143          * Set DAT3 to input
 144          */
 145         setup &= ~WBSD_DAT3_H;
 146         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 147         host->flags &= ~WBSD_FIGNORE_DETECT;
 148
 149         /*
 150          * Read back default clock.
 151          */
 152         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
 153
 154         /*
 155          * Power down port.
 156          */
 157         outb(WBSD_POWER_N, host->base + WBSD_CSR);
 158
 159         /*
 160          * Set maximum timeout.
 161          */
 162         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
 163
 164         /*
 165          * Test for card presence
 166          */
 167         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
 168                 host->flags |= WBSD_FCARD_PRESENT;
 169         else
 170                 host->flags &= ~WBSD_FCARD_PRESENT;
 171
 172         /*
 173          * Enable interesting interrupts.
 174          */
 175         ier = 0;
 176         ier |= WBSD_EINT_CARD;
 177         ier |= WBSD_EINT_FIFO_THRE;
 178         ier |= WBSD_EINT_CRC;
 179         ier |= WBSD_EINT_TIMEOUT;
 180         ier |= WBSD_EINT_TC;
 181
 182         outb(ier, host->base + WBSD_EIR);
 183
 184         /*
 185          * Clear interrupts.
 186          */
 187         inb(host->base + WBSD_ISR);
 188 }
 189
 190 static void wbsd_reset(struct wbsd_host *host)
 191 {
 192         u8 setup;
 193
 194         pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc));
 195
 196         /*
 197          * Soft reset of chip (SD/MMC part).
 198          */
 199         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 200         setup |= WBSD_SOFT_RESET;
 201         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 202 }
 203
 204 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
 205 {
 206         unsigned long dmaflags;
 207
 208         if (host->dma >= 0) {
 209                 /*
 210                  * Release ISA DMA controller.
 211                  */
 212                 dmaflags = claim_dma_lock();
 213                 disable_dma(host->dma);
 214                 clear_dma_ff(host->dma);
 215                 release_dma_lock(dmaflags);
 216
 217                 /*
 218                  * Disable DMA on host.
 219                  */
 220                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 221         }
 222
 223         host->mrq = NULL;
 224
 225         /*
 226          * MMC layer might call back into the driver so first unlock.
 227          */
 228         spin_unlock(&host->lock);
 229         mmc_request_done(host->mmc, mrq);
 230         spin_lock(&host->lock);
 231 }
 232
 233 /*
 234  * Scatter/gather functions
 235  */
 236
 237 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
 238 {
 239         /*
 240          * Get info. about SG list from data structure.
 241          */
 242         host->cur_sg = data->sg;
 243         host->num_sg = data->sg_len;
 244
 245         host->offset = 0;
 246         host->remain = host->cur_sg->length;
 247 }
 248
 249 static inline int wbsd_next_sg(struct wbsd_host *host)
 250 {
 251         /*
 252          * Skip to next SG entry.
 253          */
 254         host->cur_sg++;
 255         host->num_sg--;
 256
 257         /*
 258          * Any entries left?
 259          */
 260         if (host->num_sg > 0) {
 261                 host->offset = 0;
 262                 host->remain = host->cur_sg->length;
 263         }
 264
 265         return host->num_sg;
 266 }
 267
 268 static inline char *wbsd_map_sg(struct wbsd_host *host)
 269 {
 270         return kmap_atomic(sg_page(host->cur_sg)) + host->cur_sg->offset;
 271 }
 272
 273 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
 274 {
 275         size_t len = 0;
 276         int i;
 277
 278         for (i = 0; i < data->sg_len; i++)
 279                 len += data->sg[i].length;
 280         sg_copy_to_buffer(data->sg, data->sg_len, host->dma_buffer, len);
 281 }
 282
 283 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
 284 {
 285         size_t len = 0;
 286         int i;
 287
 288         for (i = 0; i < data->sg_len; i++)
 289                 len += data->sg[i].length;
 290         sg_copy_from_buffer(data->sg, data->sg_len, host->dma_buffer, len);
 291 }
 292
 293 /*
 294  * Command handling
 295  */
 296
 297 static inline void wbsd_get_short_reply(struct wbsd_host *host,
 298                                         struct mmc_command *cmd)
 299 {
 300         /*
 301          * Correct response type?
 302          */
 303         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
 304                 cmd->error = -EILSEQ;
 305                 return;
 306         }
 307
 308         cmd->resp[0]  = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
 309         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
 310         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
 311         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
 312         cmd->resp[1]  = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
 313 }
 314
 315 static inline void wbsd_get_long_reply(struct wbsd_host *host,
 316         struct mmc_command *cmd)
 317 {
 318         int i;
 319
 320         /*
 321          * Correct response type?
 322          */
 323         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
 324                 cmd->error = -EILSEQ;
 325                 return;
 326         }
 327
 328         for (i = 0; i < 4; i++) {
 329                 cmd->resp[i] =
 330                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
 331                 cmd->resp[i] |=
 332                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
 333                 cmd->resp[i] |=
 334                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
 335                 cmd->resp[i] |=
 336                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
 337         }
 338 }
 339
 340 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
 341 {
 342         int i;
 343         u8 status, isr;
 344
 345         /*
 346          * Clear accumulated ISR. The interrupt routine
 347          * will fill this one with events that occur during
 348          * transfer.
 349          */
 350         host->isr = 0;
 351
 352         /*
 353          * Send the command (CRC calculated by host).
 354          */
 355         outb(cmd->opcode, host->base + WBSD_CMDR);
 356         for (i = 3; i >= 0; i--)
 357                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
 358
 359         cmd->error = 0;
 360
 361         /*
 362          * Wait for the request to complete.
 363          */
 364         do {
 365                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 366         } while (status & WBSD_CARDTRAFFIC);
 367
 368         /*
 369          * Do we expect a reply?
 370          */
 371         if (cmd->flags & MMC_RSP_PRESENT) {
 372                 /*
 373                  * Read back status.
 374                  */
 375                 isr = host->isr;
 376
 377                 /* Card removed? */
 378                 if (isr & WBSD_INT_CARD)
 379                         cmd->error = -ENOMEDIUM;
 380                 /* Timeout? */
 381                 else if (isr & WBSD_INT_TIMEOUT)
 382                         cmd->error = -ETIMEDOUT;
 383                 /* CRC? */
 384                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
 385                         cmd->error = -EILSEQ;
 386                 /* All ok */
 387                 else {
 388                         if (cmd->flags & MMC_RSP_136)
 389                                 wbsd_get_long_reply(host, cmd);
 390                         else
 391                                 wbsd_get_short_reply(host, cmd);
 392                 }
 393         }
 394 }
 395
 396 /*
 397  * Data functions
 398  */
 399
 400 static void wbsd_empty_fifo(struct wbsd_host *host)
 401 {
 402         struct mmc_data *data = host->mrq->cmd->data;
 403         char *buffer;
 404         int i, idx, fsr, fifo;
 405
 406         /*
 407          * Handle excessive data.
 408          */
 409         if (host->num_sg == 0)
 410                 return;
 411
 412         buffer = wbsd_map_sg(host) + host->offset;
 413         idx = 0;
 414
 415         /*
 416          * Drain the fifo. This has a tendency to loop longer
 417          * than the FIFO length (usually one block).
 418          */
 419         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
 420                 /*
 421                  * The size field in the FSR is broken so we have to
 422                  * do some guessing.
 423                  */
 424                 if (fsr & WBSD_FIFO_FULL)
 425                         fifo = 16;
 426                 else if (fsr & WBSD_FIFO_FUTHRE)
 427                         fifo = 8;
 428                 else
 429                         fifo = 1;
 430
 431                 for (i = 0; i < fifo; i++) {
 432                         buffer[idx++] = inb(host->base + WBSD_DFR);
 433                         host->offset++;
 434                         host->remain--;
 435
 436                         data->bytes_xfered++;
 437
 438                         /*
 439                          * End of scatter list entry?
 440                          */
 441                         if (host->remain == 0) {
 442                                 kunmap_atomic(buffer);
 443                                 /*
 444                                  * Get next entry. Check if last.
 445                                  */
 446                                 if (!wbsd_next_sg(host))
 447                                         return;
 448
 449                                 buffer = wbsd_map_sg(host);
 450                                 idx = 0;
 451                         }
 452                 }
 453         }
 454         kunmap_atomic(buffer);
 455
 456         /*
 457          * This is a very dirty hack to solve a
 458          * hardware problem. The chip doesn't trigger
 459          * FIFO threshold interrupts properly.
 460          */
 461         if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
 462                 tasklet_schedule(&host->fifo_tasklet);
 463 }
 464
 465 static void wbsd_fill_fifo(struct wbsd_host *host)
 466 {
 467         struct mmc_data *data = host->mrq->cmd->data;
 468         char *buffer;
 469         int i, idx, fsr, fifo;
 470
 471         /*
 472          * Check that we aren't being called after the
 473          * entire buffer has been transferred.
 474          */
 475         if (host->num_sg == 0)
 476                 return;
 477
 478         buffer = wbsd_map_sg(host) + host->offset;
 479         idx = 0;
 480
 481         /*
 482          * Fill the fifo. This has a tendency to loop longer
 483          * than the FIFO length (usually one block).
 484          */
 485         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
 486                 /*
 487                  * The size field in the FSR is broken so we have to
 488                  * do some guessing.
 489                  */
 490                 if (fsr & WBSD_FIFO_EMPTY)
 491                         fifo = 0;
 492                 else if (fsr & WBSD_FIFO_EMTHRE)
 493                         fifo = 8;
 494                 else
 495                         fifo = 15;
 496
 497                 for (i = 16; i > fifo; i--) {
 498                         outb(buffer[idx], host->base + WBSD_DFR);
 499                         host->offset++;
 500                         host->remain--;
 501
 502                         data->bytes_xfered++;
 503
 504                         /*
 505                          * End of scatter list entry?
 506                          */
 507                         if (host->remain == 0) {
 508                                 kunmap_atomic(buffer);
 509                                 /*
 510                                  * Get next entry. Check if last.
 511                                  */
 512                                 if (!wbsd_next_sg(host))
 513                                         return;
 514
 515                                 buffer = wbsd_map_sg(host);
 516                                 idx = 0;
 517                         }
 518                 }
 519         }
 520         kunmap_atomic(buffer);
 521
 522         /*
 523          * The controller stops sending interrupts for
 524          * 'FIFO empty' under certain conditions. So we
 525          * need to be a bit more pro-active.
 526          */
 527         tasklet_schedule(&host->fifo_tasklet);
 528 }
 529
 530 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
 531 {
 532         u16 blksize;
 533         u8 setup;
 534         unsigned long dmaflags;
 535         unsigned int size;
 536
 537         /*
 538          * Calculate size.
 539          */
 540         size = data->blocks * data->blksz;
 541
 542         /*
 543          * Check timeout values for overflow.
 544          * (Yes, some cards cause this value to overflow).
 545          */
 546         if (data->timeout_ns > 127000000)
 547                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
 548         else {
 549                 wbsd_write_index(host, WBSD_IDX_TAAC,
 550                         data->timeout_ns / 1000000);
 551         }
 552
 553         if (data->timeout_clks > 255)
 554                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
 555         else
 556                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
 557
 558         /*
 559          * Inform the chip of how large blocks will be
 560          * sent. It needs this to determine when to
 561          * calculate CRC.
 562          *
 563          * Space for CRC must be included in the size.
 564          * Two bytes are needed for each data line.
 565          */
 566         if (host->bus_width == MMC_BUS_WIDTH_1) {
 567                 blksize = data->blksz + 2;
 568
 569                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
 570                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 571         } else if (host->bus_width == MMC_BUS_WIDTH_4) {
 572                 blksize = data->blksz + 2 * 4;
 573
 574                 wbsd_write_index(host, WBSD_IDX_PBSMSB,
 575                         ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
 576                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
 577         } else {
 578                 data->error = -EINVAL;
 579                 return;
 580         }
 581
 582         /*
 583          * Clear the FIFO. This is needed even for DMA
 584          * transfers since the chip still uses the FIFO
 585          * internally.
 586          */
 587         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 588         setup |= WBSD_FIFO_RESET;
 589         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 590
 591         /*
 592          * DMA transfer?
 593          */
 594         if (host->dma >= 0) {
 595                 /*
 596                  * The buffer for DMA is only 64 kB.
 597                  */
 598                 BUG_ON(size > 0x10000);
 599                 if (size > 0x10000) {
 600                         data->error = -EINVAL;
 601                         return;
 602                 }
 603
 604                 /*
 605                  * Transfer data from the SG list to
 606                  * the DMA buffer.
 607                  */
 608                 if (data->flags & MMC_DATA_WRITE)
 609                         wbsd_sg_to_dma(host, data);
 610
 611                 /*
 612                  * Initialise the ISA DMA controller.
 613                  */
 614                 dmaflags = claim_dma_lock();
 615                 disable_dma(host->dma);
 616                 clear_dma_ff(host->dma);
 617                 if (data->flags & MMC_DATA_READ)
 618                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
 619                 else
 620                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
 621                 set_dma_addr(host->dma, host->dma_addr);
 622                 set_dma_count(host->dma, size);
 623
 624                 enable_dma(host->dma);
 625                 release_dma_lock(dmaflags);
 626
 627                 /*
 628                  * Enable DMA on the host.
 629                  */
 630                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
 631         } else {
 632                 /*
 633                  * This flag is used to keep printk
 634                  * output to a minimum.
 635                  */
 636                 host->firsterr = 1;
 637
 638                 /*
 639                  * Initialise the SG list.
 640                  */
 641                 wbsd_init_sg(host, data);
 642
 643                 /*
 644                  * Turn off DMA.
 645                  */
 646                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 647
 648                 /*
 649                  * Set up FIFO threshold levels (and fill
 650                  * buffer if doing a write).
 651                  */
 652                 if (data->flags & MMC_DATA_READ) {
 653                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 654                                 WBSD_FIFOEN_FULL | 8);
 655                 } else {
 656                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
 657                                 WBSD_FIFOEN_EMPTY | 8);
 658                         wbsd_fill_fifo(host);
 659                 }
 660         }
 661
 662         data->error = 0;
 663 }
 664
 665 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
 666 {
 667         unsigned long dmaflags;
 668         int count;
 669         u8 status;
 670
 671         WARN_ON(host->mrq == NULL);
 672
 673         /*
 674          * Send a stop command if needed.
 675          */
 676         if (data->stop)
 677                 wbsd_send_command(host, data->stop);
 678
 679         /*
 680          * Wait for the controller to leave data
 681          * transfer state.
 682          */
 683         do {
 684                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
 685         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
 686
 687         /*
 688          * DMA transfer?
 689          */
 690         if (host->dma >= 0) {
 691                 /*
 692                  * Disable DMA on the host.
 693                  */
 694                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
 695
 696                 /*
 697                  * Turn of ISA DMA controller.
 698                  */
 699                 dmaflags = claim_dma_lock();
 700                 disable_dma(host->dma);
 701                 clear_dma_ff(host->dma);
 702                 count = get_dma_residue(host->dma);
 703                 release_dma_lock(dmaflags);
 704
 705                 data->bytes_xfered = host->mrq->data->blocks *
 706                         host->mrq->data->blksz - count;
 707                 data->bytes_xfered -= data->bytes_xfered % data->blksz;
 708
 709                 /*
 710                  * Any leftover data?
 711                  */
 712                 if (count) {
 713                         pr_err("%s: Incomplete DMA transfer. "
 714                                 "%d bytes left.\n",
 715                                 mmc_hostname(host->mmc), count);
 716
 717                         if (!data->error)
 718                                 data->error = -EIO;
 719                 } else {
 720                         /*
 721                          * Transfer data from DMA buffer to
 722                          * SG list.
 723                          */
 724                         if (data->flags & MMC_DATA_READ)
 725                                 wbsd_dma_to_sg(host, data);
 726                 }
 727
 728                 if (data->error) {
 729                         if (data->bytes_xfered)
 730                                 data->bytes_xfered -= data->blksz;
 731                 }
 732         }
 733
 734         wbsd_request_end(host, host->mrq);
 735 }
 736
 737 /*****************************************************************************\
 738  *                                                                           *
 739  * MMC layer callbacks                                                       *
 740  *                                                                           *
 741 \*****************************************************************************/
 742
 743 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 744 {
 745         struct wbsd_host *host = mmc_priv(mmc);
 746         struct mmc_command *cmd;
 747
 748         /*
 749          * Disable tasklets to avoid a deadlock.
 750          */
 751         spin_lock_bh(&host->lock);
 752
 753         BUG_ON(host->mrq != NULL);
 754
 755         cmd = mrq->cmd;
 756
 757         host->mrq = mrq;
 758
 759         /*
 760          * Check that there is actually a card in the slot.
 761          */
 762         if (!(host->flags & WBSD_FCARD_PRESENT)) {
 763                 cmd->error = -ENOMEDIUM;
 764                 goto done;
 765         }
 766
 767         if (cmd->data) {
 768                 /*
 769                  * The hardware is so delightfully stupid that it has a list
 770                  * of "data" commands. If a command isn't on this list, it'll
 771                  * just go back to the idle state and won't send any data
 772                  * interrupts.
 773                  */
 774                 switch (cmd->opcode) {
 775                 case SD_SWITCH_VOLTAGE:
 776                 case MMC_READ_SINGLE_BLOCK:
 777                 case MMC_READ_MULTIPLE_BLOCK:
 778                 case MMC_WRITE_DAT_UNTIL_STOP:
 779                 case MMC_WRITE_BLOCK:
 780                 case MMC_WRITE_MULTIPLE_BLOCK:
 781                 case MMC_PROGRAM_CID:
 782                 case MMC_PROGRAM_CSD:
 783                 case MMC_SEND_WRITE_PROT:
 784                 case MMC_LOCK_UNLOCK:
 785                 case MMC_GEN_CMD:
 786                         break;
 787
 788                 /* ACMDs. We don't keep track of state, so we just treat them
 789                  * like any other command. */
 790                 case SD_APP_SEND_SCR:
 791                         break;
 792
 793                 default:
 794                         pr_warn("%s: Data command %d is not supported by this controller\n",
 795                                 mmc_hostname(host->mmc), cmd->opcode);
 796                         cmd->error = -EINVAL;
 797
 798                         goto done;
 799                 }
 800         }
 801
 802         /*
 803          * Does the request include data?
 804          */
 805         if (cmd->data) {
 806                 wbsd_prepare_data(host, cmd->data);
 807
 808                 if (cmd->data->error)
 809                         goto done;
 810         }
 811
 812         wbsd_send_command(host, cmd);
 813
 814         /*
 815          * If this is a data transfer the request
 816          * will be finished after the data has
 817          * transferred.
 818          */
 819         if (cmd->data && !cmd->error) {
 820                 /*
 821                  * Dirty fix for hardware bug.
 822                  */
 823                 if (host->dma == -1)
 824                         tasklet_schedule(&host->fifo_tasklet);
 825
 826                 spin_unlock_bh(&host->lock);
 827
 828                 return;
 829         }
 830
 831 done:
 832         wbsd_request_end(host, mrq);
 833
 834         spin_unlock_bh(&host->lock);
 835 }
 836
 837 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 838 {
 839         struct wbsd_host *host = mmc_priv(mmc);
 840         u8 clk, setup, pwr;
 841
 842         spin_lock_bh(&host->lock);
 843
 844         /*
 845          * Reset the chip on each power off.
 846          * Should clear out any weird states.
 847          */
 848         if (ios->power_mode == MMC_POWER_OFF)
 849                 wbsd_init_device(host);
 850
 851         if (ios->clock >= 24000000)
 852                 clk = WBSD_CLK_24M;
 853         else if (ios->clock >= 16000000)
 854                 clk = WBSD_CLK_16M;
 855         else if (ios->clock >= 12000000)
 856                 clk = WBSD_CLK_12M;
 857         else
 858                 clk = WBSD_CLK_375K;
 859
 860         /*
 861          * Only write to the clock register when
 862          * there is an actual change.
 863          */
 864         if (clk != host->clk) {
 865                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
 866                 host->clk = clk;
 867         }
 868
 869         /*
 870          * Power up card.
 871          */
 872         if (ios->power_mode != MMC_POWER_OFF) {
 873                 pwr = inb(host->base + WBSD_CSR);
 874                 pwr &= ~WBSD_POWER_N;
 875                 outb(pwr, host->base + WBSD_CSR);
 876         }
 877
 878         /*
 879          * MMC cards need to have pin 1 high during init.
 880          * It wreaks havoc with the card detection though so
 881          * that needs to be disabled.
 882          */
 883         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
 884         if (ios->chip_select == MMC_CS_HIGH) {
 885                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
 886                 setup |= WBSD_DAT3_H;
 887                 host->flags |= WBSD_FIGNORE_DETECT;
 888         } else {
 889                 if (setup & WBSD_DAT3_H) {
 890                         setup &= ~WBSD_DAT3_H;
 891
 892                         /*
 893                          * We cannot resume card detection immediately
 894                          * because of capacitance and delays in the chip.
 895                          */
 896                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
 897                 }
 898         }
 899         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
 900
 901         /*
 902          * Store bus width for later. Will be used when
 903          * setting up the data transfer.
 904          */
 905         host->bus_width = ios->bus_width;
 906
 907         spin_unlock_bh(&host->lock);
 908 }
 909
 910 static int wbsd_get_ro(struct mmc_host *mmc)
 911 {
 912         struct wbsd_host *host = mmc_priv(mmc);
 913         u8 csr;
 914
 915         spin_lock_bh(&host->lock);
 916
 917         csr = inb(host->base + WBSD_CSR);
 918         csr |= WBSD_MSLED;
 919         outb(csr, host->base + WBSD_CSR);
 920
 921         mdelay(1);
 922
 923         csr = inb(host->base + WBSD_CSR);
 924         csr &= ~WBSD_MSLED;
 925         outb(csr, host->base + WBSD_CSR);
 926
 927         spin_unlock_bh(&host->lock);
 928
 929         return !!(csr & WBSD_WRPT);
 930 }
 931
 932 static const struct mmc_host_ops wbsd_ops = {
 933         .request        = wbsd_request,
 934         .set_ios        = wbsd_set_ios,
 935         .get_ro         = wbsd_get_ro,
 936 };
 937
 938 /*****************************************************************************\
 939  *                                                                           *
 940  * Interrupt handling                                                        *
 941  *                                                                           *
 942 \*****************************************************************************/
 943
 944 /*
 945  * Helper function to reset detection ignore
 946  */
 947
 948 static void wbsd_reset_ignore(struct timer_list *t)
 949 {
 950         struct wbsd_host *host = from_timer(host, t, ignore_timer);
 951
 952         BUG_ON(host == NULL);
 953
 954         DBG("Resetting card detection ignore\n");
 955
 956         spin_lock_bh(&host->lock);
 957
 958         host->flags &= ~WBSD_FIGNORE_DETECT;
 959
 960         /*
 961          * Card status might have changed during the
 962          * blackout.
 963          */
 964         tasklet_schedule(&host->card_tasklet);
 965
 966         spin_unlock_bh(&host->lock);
 967 }
 968
 969 /*
 970  * Tasklets
 971  */
 972
 973 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
 974 {
 975         WARN_ON(!host->mrq);
 976         if (!host->mrq)
 977                 return NULL;
 978
 979         WARN_ON(!host->mrq->cmd);
 980         if (!host->mrq->cmd)
 981                 return NULL;
 982
 983         WARN_ON(!host->mrq->cmd->data);
 984         if (!host->mrq->cmd->data)
 985                 return NULL;
 986
 987         return host->mrq->cmd->data;
 988 }
 989
 990 static void wbsd_tasklet_card(struct tasklet_struct *t)
 991 {
 992         struct wbsd_host *host = from_tasklet(host, t, card_tasklet);
 993         u8 csr;
 994         int delay = -1;
 995
 996         spin_lock(&host->lock);
 997
 998         if (host->flags & WBSD_FIGNORE_DETECT) {
 999                 spin_unlock(&host->lock);
1000                 return;
1001         }
1002
1003         csr = inb(host->base + WBSD_CSR);
1004         WARN_ON(csr == 0xff);
1005
1006         if (csr & WBSD_CARDPRESENT) {
1007                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1008                         DBG("Card inserted\n");
1009                         host->flags |= WBSD_FCARD_PRESENT;
1010
1011                         delay = 500;
1012                 }
1013         } else if (host->flags & WBSD_FCARD_PRESENT) {
1014                 DBG("Card removed\n");
1015                 host->flags &= ~WBSD_FCARD_PRESENT;
1016
1017                 if (host->mrq) {
1018                         pr_err("%s: Card removed during transfer!\n",
1019                                 mmc_hostname(host->mmc));
1020                         wbsd_reset(host);
1021
1022                         host->mrq->cmd->error = -ENOMEDIUM;
1023                         tasklet_schedule(&host->finish_tasklet);
1024                 }
1025
1026                 delay = 0;
1027         }
1028
1029         /*
1030          * Unlock first since we might get a call back.
1031          */
1032
1033         spin_unlock(&host->lock);
1034
1035         if (delay != -1)
1036                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1037 }
1038
1039 static void wbsd_tasklet_fifo(struct tasklet_struct *t)
1040 {
1041         struct wbsd_host *host = from_tasklet(host, t, fifo_tasklet);
1042         struct mmc_data *data;
1043
1044         spin_lock(&host->lock);
1045
1046         if (!host->mrq)
1047                 goto end;
1048
1049         data = wbsd_get_data(host);
1050         if (!data)
1051                 goto end;
1052
1053         if (data->flags & MMC_DATA_WRITE)
1054                 wbsd_fill_fifo(host);
1055         else
1056                 wbsd_empty_fifo(host);
1057
1058         /*
1059          * Done?
1060          */
1061         if (host->num_sg == 0) {
1062                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1063                 tasklet_schedule(&host->finish_tasklet);
1064         }
1065
1066 end:
1067         spin_unlock(&host->lock);
1068 }
1069
1070 static void wbsd_tasklet_crc(struct tasklet_struct *t)
1071 {
1072         struct wbsd_host *host = from_tasklet(host, t, crc_tasklet);
1073         struct mmc_data *data;
1074
1075         spin_lock(&host->lock);
1076
1077         if (!host->mrq)
1078                 goto end;
1079
1080         data = wbsd_get_data(host);
1081         if (!data)
1082                 goto end;
1083
1084         DBGF("CRC error\n");
1085
1086         data->error = -EILSEQ;
1087
1088         tasklet_schedule(&host->finish_tasklet);
1089
1090 end:
1091         spin_unlock(&host->lock);
1092 }
1093
1094 static void wbsd_tasklet_timeout(struct tasklet_struct *t)
1095 {
1096         struct wbsd_host *host = from_tasklet(host, t, timeout_tasklet);
1097         struct mmc_data *data;
1098
1099         spin_lock(&host->lock);
1100
1101         if (!host->mrq)
1102                 goto end;
1103
1104         data = wbsd_get_data(host);
1105         if (!data)
1106                 goto end;
1107
1108         DBGF("Timeout\n");
1109
1110         data->error = -ETIMEDOUT;
1111
1112         tasklet_schedule(&host->finish_tasklet);
1113
1114 end:
1115         spin_unlock(&host->lock);
1116 }
1117
1118 static void wbsd_tasklet_finish(struct tasklet_struct *t)
1119 {
1120         struct wbsd_host *host = from_tasklet(host, t, finish_tasklet);
1121         struct mmc_data *data;
1122
1123         spin_lock(&host->lock);
1124
1125         WARN_ON(!host->mrq);
1126         if (!host->mrq)
1127                 goto end;
1128
1129         data = wbsd_get_data(host);
1130         if (!data)
1131                 goto end;
1132
1133         wbsd_finish_data(host, data);
1134
1135 end:
1136         spin_unlock(&host->lock);
1137 }
1138
1139 /*
1140  * Interrupt handling
1141  */
1142
1143 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1144 {
1145         struct wbsd_host *host = dev_id;
1146         int isr;
1147
1148         isr = inb(host->base + WBSD_ISR);
1149
1150         /*
1151          * Was it actually our hardware that caused the interrupt?
1152          */
1153         if (isr == 0xff || isr == 0x00)
1154                 return IRQ_NONE;
1155
1156         host->isr |= isr;
1157
1158         /*
1159          * Schedule tasklets as needed.
1160          */
1161         if (isr & WBSD_INT_CARD)
1162                 tasklet_schedule(&host->card_tasklet);
1163         if (isr & WBSD_INT_FIFO_THRE)
1164                 tasklet_schedule(&host->fifo_tasklet);
1165         if (isr & WBSD_INT_CRC)
1166                 tasklet_hi_schedule(&host->crc_tasklet);
1167         if (isr & WBSD_INT_TIMEOUT)
1168                 tasklet_hi_schedule(&host->timeout_tasklet);
1169         if (isr & WBSD_INT_TC)
1170                 tasklet_schedule(&host->finish_tasklet);
1171
1172         return IRQ_HANDLED;
1173 }
1174
1175 /*****************************************************************************\
1176  *                                                                           *
1177  * Device initialisation and shutdown                                        *
1178  *                                                                           *
1179 \*****************************************************************************/
1180
1181 /*
1182  * Allocate/free MMC structure.
1183  */
1184
1185 static int wbsd_alloc_mmc(struct device *dev)
1186 {
1187         struct mmc_host *mmc;
1188         struct wbsd_host *host;
1189
1190         /*
1191          * Allocate MMC structure.
1192          */
1193         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1194         if (!mmc)
1195                 return -ENOMEM;
1196
1197         host = mmc_priv(mmc);
1198         host->mmc = mmc;
1199
1200         host->dma = -1;
1201
1202         /*
1203          * Set host parameters.
1204          */
1205         mmc->ops = &wbsd_ops;
1206         mmc->f_min = 375000;
1207         mmc->f_max = 24000000;
1208         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1209         mmc->caps = MMC_CAP_4_BIT_DATA;
1210
1211         spin_lock_init(&host->lock);
1212
1213         /*
1214          * Set up timers
1215          */
1216         timer_setup(&host->ignore_timer, wbsd_reset_ignore, 0);
1217
1218         /*
1219          * Maximum number of segments. Worst case is one sector per segment
1220          * so this will be 64kB/512.
1221          */
1222         mmc->max_segs = 128;
1223
1224         /*
1225          * Maximum request size. Also limited by 64KiB buffer.
1226          */
1227         mmc->max_req_size = 65536;
1228
1229         /*
1230          * Maximum segment size. Could be one segment with the maximum number
1231          * of bytes.
1232          */
1233         mmc->max_seg_size = mmc->max_req_size;
1234
1235         /*
1236          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1237          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1238          */
1239         mmc->max_blk_size = 4087;
1240
1241         /*
1242          * Maximum block count. There is no real limit so the maximum
1243          * request size will be the only restriction.
1244          */
1245         mmc->max_blk_count = mmc->max_req_size;
1246
1247         dev_set_drvdata(dev, mmc);
1248
1249         return 0;
1250 }
1251
1252 static void wbsd_free_mmc(struct device *dev)
1253 {
1254         struct mmc_host *mmc;
1255         struct wbsd_host *host;
1256
1257         mmc = dev_get_drvdata(dev);
1258         if (!mmc)
1259                 return;
1260
1261         host = mmc_priv(mmc);
1262         BUG_ON(host == NULL);
1263
1264         del_timer_sync(&host->ignore_timer);
1265
1266         mmc_free_host(mmc);
1267
1268         dev_set_drvdata(dev, NULL);
1269 }
1270
1271 /*
1272  * Scan for known chip id:s
1273  */
1274
1275 static int wbsd_scan(struct wbsd_host *host)
1276 {
1277         int i, j, k;
1278         int id;
1279
1280         /*
1281          * Iterate through all ports, all codes to
1282          * find hardware that is in our known list.
1283          */
1284         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1285                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1286                         continue;
1287
1288                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1289                         id = 0xFFFF;
1290
1291                         host->config = config_ports[i];
1292                         host->unlock_code = unlock_codes[j];
1293
1294                         wbsd_unlock_config(host);
1295
1296                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1297                         id = inb(config_ports[i] + 1) << 8;
1298
1299                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1300                         id |= inb(config_ports[i] + 1);
1301
1302                         wbsd_lock_config(host);
1303
1304                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1305                                 if (id == valid_ids[k]) {
1306                                         host->chip_id = id;
1307
1308                                         return 0;
1309                                 }
1310                         }
1311
1312                         if (id != 0xFFFF) {
1313                                 DBG("Unknown hardware (id %x) found at %x\n",
1314                                         id, config_ports[i]);
1315                         }
1316                 }
1317
1318                 release_region(config_ports[i], 2);
1319         }
1320
1321         host->config = 0;
1322         host->unlock_code = 0;
1323
1324         return -ENODEV;
1325 }
1326
1327 /*
1328  * Allocate/free io port ranges
1329  */
1330
1331 static int wbsd_request_region(struct wbsd_host *host, int base)
1332 {
1333         if (base & 0x7)
1334                 return -EINVAL;
1335
1336         if (!request_region(base, 8, DRIVER_NAME))
1337                 return -EIO;
1338
1339         host->base = base;
1340
1341         return 0;
1342 }
1343
1344 static void wbsd_release_regions(struct wbsd_host *host)
1345 {
1346         if (host->base)
1347                 release_region(host->base, 8);
1348
1349         host->base = 0;
1350
1351         if (host->config)
1352                 release_region(host->config, 2);
1353
1354         host->config = 0;
1355 }
1356
1357 /*
1358  * Allocate/free DMA port and buffer
1359  */
1360
1361 static void wbsd_request_dma(struct wbsd_host *host, int dma)
1362 {
1363         if (dma < 0)
1364                 return;
1365
1366         if (request_dma(dma, DRIVER_NAME))
1367                 goto err;
1368
1369         /*
1370          * We need to allocate a special buffer in
1371          * order for ISA to be able to DMA to it.
1372          */
1373         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1374                 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1375         if (!host->dma_buffer)
1376                 goto free;
1377
1378         /*
1379          * Translate the address to a physical address.
1380          */
1381         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1382                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1383         if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1384                 goto kfree;
1385
1386         /*
1387          * ISA DMA must be aligned on a 64k basis.
1388          */
1389         if ((host->dma_addr & 0xffff) != 0)
1390                 goto unmap;
1391         /*
1392          * ISA cannot access memory above 16 MB.
1393          */
1394         else if (host->dma_addr >= 0x1000000)
1395                 goto unmap;
1396
1397         host->dma = dma;
1398
1399         return;
1400
1401 unmap:
1402         /*
1403          * If we've gotten here then there is some kind of alignment bug
1404          */
1405         BUG_ON(1);
1406
1407         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1408                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1409         host->dma_addr = 0;
1410
1411 kfree:
1412         kfree(host->dma_buffer);
1413         host->dma_buffer = NULL;
1414
1415 free:
1416         free_dma(dma);
1417
1418 err:
1419         pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1420                 dma);
1421 }
1422
1423 static void wbsd_release_dma(struct wbsd_host *host)
1424 {
1425         /*
1426          * host->dma_addr is valid here iff host->dma_buffer is not NULL.
1427          */
1428         if (host->dma_buffer) {
1429                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1430                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1431                 kfree(host->dma_buffer);
1432         }
1433         if (host->dma >= 0)
1434                 free_dma(host->dma);
1435
1436         host->dma = -1;
1437         host->dma_buffer = NULL;
1438         host->dma_addr = 0;
1439 }
1440
1441 /*
1442  * Allocate/free IRQ.
1443  */
1444
1445 static int wbsd_request_irq(struct wbsd_host *host, int irq)
1446 {
1447         int ret;
1448
1449         /*
1450          * Set up tasklets. Must be done before requesting interrupt.
1451          */
1452         tasklet_setup(&host->card_tasklet, wbsd_tasklet_card);
1453         tasklet_setup(&host->fifo_tasklet, wbsd_tasklet_fifo);
1454         tasklet_setup(&host->crc_tasklet, wbsd_tasklet_crc);
1455         tasklet_setup(&host->timeout_tasklet, wbsd_tasklet_timeout);
1456         tasklet_setup(&host->finish_tasklet, wbsd_tasklet_finish);
1457
1458         /*
1459          * Allocate interrupt.
1460          */
1461         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1462         if (ret)
1463                 return ret;
1464
1465         host->irq = irq;
1466
1467         return 0;
1468 }
1469
1470 static void  wbsd_release_irq(struct wbsd_host *host)
1471 {
1472         if (!host->irq)
1473                 return;
1474
1475         free_irq(host->irq, host);
1476
1477         host->irq = 0;
1478
1479         tasklet_kill(&host->card_tasklet);
1480         tasklet_kill(&host->fifo_tasklet);
1481         tasklet_kill(&host->crc_tasklet);
1482         tasklet_kill(&host->timeout_tasklet);
1483         tasklet_kill(&host->finish_tasklet);
1484 }
1485
1486 /*
1487  * Allocate all resources for the host.
1488  */
1489
1490 static int wbsd_request_resources(struct wbsd_host *host,
1491         int base, int irq, int dma)
1492 {
1493         int ret;
1494
1495         /*
1496          * Allocate I/O ports.
1497          */
1498         ret = wbsd_request_region(host, base);
1499         if (ret)
1500                 return ret;
1501
1502         /*
1503          * Allocate interrupt.
1504          */
1505         ret = wbsd_request_irq(host, irq);
1506         if (ret)
1507                 return ret;
1508
1509         /*
1510          * Allocate DMA.
1511          */
1512         wbsd_request_dma(host, dma);
1513
1514         return 0;
1515 }
1516
1517 /*
1518  * Release all resources for the host.
1519  */
1520
1521 static void wbsd_release_resources(struct wbsd_host *host)
1522 {
1523         wbsd_release_dma(host);
1524         wbsd_release_irq(host);
1525         wbsd_release_regions(host);
1526 }
1527
1528 /*
1529  * Configure the resources the chip should use.
1530  */
1531
1532 static void wbsd_chip_config(struct wbsd_host *host)
1533 {
1534         wbsd_unlock_config(host);
1535
1536         /*
1537          * Reset the chip.
1538          */
1539         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1540         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1541
1542         /*
1543          * Select SD/MMC function.
1544          */
1545         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1546
1547         /*
1548          * Set up card detection.
1549          */
1550         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1551
1552         /*
1553          * Configure chip
1554          */
1555         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1556         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1557
1558         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1559
1560         if (host->dma >= 0)
1561                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1562
1563         /*
1564          * Enable and power up chip.
1565          */
1566         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1567         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1568
1569         wbsd_lock_config(host);
1570 }
1571
1572 /*
1573  * Check that configured resources are correct.
1574  */
1575
1576 static int wbsd_chip_validate(struct wbsd_host *host)
1577 {
1578         int base, irq, dma;
1579
1580         wbsd_unlock_config(host);
1581
1582         /*
1583          * Select SD/MMC function.
1584          */
1585         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1586
1587         /*
1588          * Read configuration.
1589          */
1590         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1591         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1592
1593         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1594
1595         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1596
1597         wbsd_lock_config(host);
1598
1599         /*
1600          * Validate against given configuration.
1601          */
1602         if (base != host->base)
1603                 return 0;
1604         if (irq != host->irq)
1605                 return 0;
1606         if ((dma != host->dma) && (host->dma != -1))
1607                 return 0;
1608
1609         return 1;
1610 }
1611
1612 /*
1613  * Powers down the SD function
1614  */
1615
1616 static void wbsd_chip_poweroff(struct wbsd_host *host)
1617 {
1618         wbsd_unlock_config(host);
1619
1620         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1621         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1622
1623         wbsd_lock_config(host);
1624 }
1625
1626 /*****************************************************************************\
1627  *                                                                           *
1628  * Devices setup and shutdown                                                *
1629  *                                                                           *
1630 \*****************************************************************************/
1631
1632 static int wbsd_init(struct device *dev, int base, int irq, int dma,
1633         int pnp)
1634 {
1635         struct wbsd_host *host = NULL;
1636         struct mmc_host *mmc = NULL;
1637         int ret;
1638
1639         ret = wbsd_alloc_mmc(dev);
1640         if (ret)
1641                 return ret;
1642
1643         mmc = dev_get_drvdata(dev);
1644         host = mmc_priv(mmc);
1645
1646         /*
1647          * Scan for hardware.
1648          */
1649         ret = wbsd_scan(host);
1650         if (ret) {
1651                 if (pnp && (ret == -ENODEV)) {
1652                         pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
1653                 } else {
1654                         wbsd_free_mmc(dev);
1655                         return ret;
1656                 }
1657         }
1658
1659         /*
1660          * Request resources.
1661          */
1662         ret = wbsd_request_resources(host, base, irq, dma);
1663         if (ret) {
1664                 wbsd_release_resources(host);
1665                 wbsd_free_mmc(dev);
1666                 return ret;
1667         }
1668
1669         /*
1670          * See if chip needs to be configured.
1671          */
1672         if (pnp) {
1673                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1674                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1675                         wbsd_chip_config(host);
1676                 }
1677         } else
1678                 wbsd_chip_config(host);
1679
1680         /*
1681          * Power Management stuff. No idea how this works.
1682          * Not tested.
1683          */
1684 #ifdef CONFIG_PM
1685         if (host->config) {
1686                 wbsd_unlock_config(host);
1687                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1688                 wbsd_lock_config(host);
1689         }
1690 #endif
1691         /*
1692          * Allow device to initialise itself properly.
1693          */
1694         mdelay(5);
1695
1696         /*
1697          * Reset the chip into a known state.
1698          */
1699         wbsd_init_device(host);
1700
1701         mmc_add_host(mmc);
1702
1703         pr_info("%s: W83L51xD", mmc_hostname(mmc));
1704         if (host->chip_id != 0)
1705                 printk(" id %x", (int)host->chip_id);
1706         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1707         if (host->dma >= 0)
1708                 printk(" dma %d", (int)host->dma);
1709         else
1710                 printk(" FIFO");
1711         if (pnp)
1712                 printk(" PnP");
1713         printk("\n");
1714
1715         return 0;
1716 }
1717
1718 static void wbsd_shutdown(struct device *dev, int pnp)
1719 {
1720         struct mmc_host *mmc = dev_get_drvdata(dev);
1721         struct wbsd_host *host;
1722
1723         if (!mmc)
1724                 return;
1725
1726         host = mmc_priv(mmc);
1727
1728         mmc_remove_host(mmc);
1729
1730         /*
1731          * Power down the SD/MMC function.
1732          */
1733         if (!pnp)
1734                 wbsd_chip_poweroff(host);
1735
1736         wbsd_release_resources(host);
1737
1738         wbsd_free_mmc(dev);
1739 }
1740
1741 /*
1742  * Non-PnP
1743  */
1744
1745 static int wbsd_probe(struct platform_device *dev)
1746 {
1747         /* Use the module parameters for resources */
1748         return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1749 }
1750
1751 static int wbsd_remove(struct platform_device *dev)
1752 {
1753         wbsd_shutdown(&dev->dev, 0);
1754
1755         return 0;
1756 }
1757
1758 /*
1759  * PnP
1760  */
1761
1762 #ifdef CONFIG_PNP
1763
1764 static int
1765 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1766 {
1767         int io, irq, dma;
1768
1769         /*
1770          * Get resources from PnP layer.
1771          */
1772         io = pnp_port_start(pnpdev, 0);
1773         irq = pnp_irq(pnpdev, 0);
1774         if (pnp_dma_valid(pnpdev, 0))
1775                 dma = pnp_dma(pnpdev, 0);
1776         else
1777                 dma = -1;
1778
1779         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1780
1781         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1782 }
1783
1784 static void wbsd_pnp_remove(struct pnp_dev *dev)
1785 {
1786         wbsd_shutdown(&dev->dev, 1);
1787 }
1788
1789 #endif /* CONFIG_PNP */
1790
1791 /*
1792  * Power management
1793  */
1794
1795 #ifdef CONFIG_PM
1796
1797 static int wbsd_platform_suspend(struct platform_device *dev,
1798                                  pm_message_t state)
1799 {
1800         struct mmc_host *mmc = platform_get_drvdata(dev);
1801         struct wbsd_host *host;
1802
1803         if (mmc == NULL)
1804                 return 0;
1805
1806         DBGF("Suspending...\n");
1807
1808         host = mmc_priv(mmc);
1809
1810         wbsd_chip_poweroff(host);
1811         return 0;
1812 }
1813
1814 static int wbsd_platform_resume(struct platform_device *dev)
1815 {
1816         struct mmc_host *mmc = platform_get_drvdata(dev);
1817         struct wbsd_host *host;
1818
1819         if (mmc == NULL)
1820                 return 0;
1821
1822         DBGF("Resuming...\n");
1823
1824         host = mmc_priv(mmc);
1825
1826         wbsd_chip_config(host);
1827
1828         /*
1829          * Allow device to initialise itself properly.
1830          */
1831         mdelay(5);
1832
1833         wbsd_init_device(host);
1834         return 0;
1835 }
1836
1837 #ifdef CONFIG_PNP
1838
1839 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1840 {
1841         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1842
1843         if (mmc == NULL)
1844                 return 0;
1845
1846         DBGF("Suspending...\n");
1847         return 0;
1848 }
1849
1850 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1851 {
1852         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1853         struct wbsd_host *host;
1854
1855         if (mmc == NULL)
1856                 return 0;
1857
1858         DBGF("Resuming...\n");
1859
1860         host = mmc_priv(mmc);
1861
1862         /*
1863          * See if chip needs to be configured.
1864          */
1865         if (host->config != 0) {
1866                 if (!wbsd_chip_validate(host)) {
1867                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1868                         wbsd_chip_config(host);
1869                 }
1870         }
1871
1872         /*
1873          * Allow device to initialise itself properly.
1874          */
1875         mdelay(5);
1876
1877         wbsd_init_device(host);
1878         return 0;
1879 }
1880
1881 #endif /* CONFIG_PNP */
1882
1883 #else /* CONFIG_PM */
1884
1885 #define wbsd_platform_suspend NULL
1886 #define wbsd_platform_resume NULL
1887
1888 #define wbsd_pnp_suspend NULL
1889 #define wbsd_pnp_resume NULL
1890
1891 #endif /* CONFIG_PM */
1892
1893 static struct platform_device *wbsd_device;
1894
1895 static struct platform_driver wbsd_driver = {
1896         .probe          = wbsd_probe,
1897         .remove         = wbsd_remove,
1898
1899         .suspend        = wbsd_platform_suspend,
1900         .resume         = wbsd_platform_resume,
1901         .driver         = {
1902                 .name   = DRIVER_NAME,
1903                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1904         },
1905 };
1906
1907 #ifdef CONFIG_PNP
1908
1909 static struct pnp_driver wbsd_pnp_driver = {
1910         .name           = DRIVER_NAME,
1911         .id_table       = pnp_dev_table,
1912         .probe          = wbsd_pnp_probe,
1913         .remove         = wbsd_pnp_remove,
1914
1915         .suspend        = wbsd_pnp_suspend,
1916         .resume         = wbsd_pnp_resume,
1917 };
1918
1919 #endif /* CONFIG_PNP */
1920
1921 /*
1922  * Module loading/unloading
1923  */
1924
1925 static int __init wbsd_drv_init(void)
1926 {
1927         int result;
1928
1929         pr_info(DRIVER_NAME
1930                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1931         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1932
1933 #ifdef CONFIG_PNP
1934
1935         if (!param_nopnp) {
1936                 result = pnp_register_driver(&wbsd_pnp_driver);
1937                 if (result < 0)
1938                         return result;
1939         }
1940 #endif /* CONFIG_PNP */
1941
1942         if (param_nopnp) {
1943                 result = platform_driver_register(&wbsd_driver);
1944                 if (result < 0)
1945                         return result;
1946
1947                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1948                 if (!wbsd_device) {
1949                         platform_driver_unregister(&wbsd_driver);
1950                         return -ENOMEM;
1951                 }
1952
1953                 result = platform_device_add(wbsd_device);
1954                 if (result) {
1955                         platform_device_put(wbsd_device);
1956                         platform_driver_unregister(&wbsd_driver);
1957                         return result;
1958                 }
1959         }
1960
1961         return 0;
1962 }
1963
1964 static void __exit wbsd_drv_exit(void)
1965 {
1966 #ifdef CONFIG_PNP
1967
1968         if (!param_nopnp)
1969                 pnp_unregister_driver(&wbsd_pnp_driver);
1970
1971 #endif /* CONFIG_PNP */
1972
1973         if (param_nopnp) {
1974                 platform_device_unregister(wbsd_device);
1975
1976                 platform_driver_unregister(&wbsd_driver);
1977         }
1978
1979         DBG("unloaded\n");
1980 }
1981
1982 module_init(wbsd_drv_init);
1983 module_exit(wbsd_drv_exit);
1984 #ifdef CONFIG_PNP
1985 module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
1986 #endif
1987 module_param_hw_named(io, param_io, uint, ioport, 0444);
1988 module_param_hw_named(irq, param_irq, uint, irq, 0444);
1989 module_param_hw_named(dma, param_dma, int, dma, 0444);
1990
1991 MODULE_LICENSE("GPL");
1992 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
1993 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
1994
1995 #ifdef CONFIG_PNP
1996 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
1997 #endif
1998 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
1999 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2000 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");