1 /* 2 * linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver 3 * 4 * Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or (at 9 * your option) any later version. 10 * 11 * 12 * Warning! 13 * 14 * Changes to the FIFO system should be done with extreme care since 15 * the hardware is full of bugs related to the FIFO. Known issues are: 16 * 17 * - FIFO size field in FSR is always zero. 18 * 19 * - FIFO interrupts tend not to work as they should. Interrupts are 20 * triggered only for full/empty events, not for threshold values. 21 * 22 * - On APIC systems the FIFO empty interrupt is sometimes lost. 23 */ 24 25 #include <linux/module.h> 26 #include <linux/moduleparam.h> 27 #include <linux/init.h> 28 #include <linux/ioport.h> 29 #include <linux/platform_device.h> 30 #include <linux/interrupt.h> 31 #include <linux/dma-mapping.h> 32 #include <linux/delay.h> 33 #include <linux/pnp.h> 34 #include <linux/highmem.h> 35 #include <linux/mmc/host.h> 36 #include <linux/scatterlist.h> 37 #include <linux/slab.h> 38 39 #include <asm/io.h> 40 #include <asm/dma.h> 41 42 #include "wbsd.h" 43 44 #define DRIVER_NAME "wbsd" 45 46 #define DBG(x...) \ 47 pr_debug(DRIVER_NAME ": " x) 48 #define DBGF(f, x...) \ 49 pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x) 50 51 /* 52 * Device resources 53 */ 54 55 #ifdef CONFIG_PNP 56 57 static const struct pnp_device_id pnp_dev_table[] = { 58 { "WEC0517", 0 }, 59 { "WEC0518", 0 }, 60 { "", 0 }, 61 }; 62 63 MODULE_DEVICE_TABLE(pnp, pnp_dev_table); 64 65 #endif /* CONFIG_PNP */ 66 67 static const int config_ports[] = { 0x2E, 0x4E }; 68 static const int unlock_codes[] = { 0x83, 0x87 }; 69 70 static const int valid_ids[] = { 71 0x7112, 72 }; 73 74 #ifdef CONFIG_PNP 75 static unsigned int param_nopnp = 0; 76 #else 77 static const unsigned int param_nopnp = 1; 78 #endif 79 static unsigned int param_io = 0x248; 80 static unsigned int param_irq = 6; 81 static int param_dma = 2; 82 83 /* 84 * Basic functions 85 */ 86 87 static inline void wbsd_unlock_config(struct wbsd_host *host) 88 { 89 BUG_ON(host->config == 0); 90 91 outb(host->unlock_code, host->config); 92 outb(host->unlock_code, host->config); 93 } 94 95 static inline void wbsd_lock_config(struct wbsd_host *host) 96 { 97 BUG_ON(host->config == 0); 98 99 outb(LOCK_CODE, host->config); 100 } 101 102 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value) 103 { 104 BUG_ON(host->config == 0); 105 106 outb(reg, host->config); 107 outb(value, host->config + 1); 108 } 109 110 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg) 111 { 112 BUG_ON(host->config == 0); 113 114 outb(reg, host->config); 115 return inb(host->config + 1); 116 } 117 118 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value) 119 { 120 outb(index, host->base + WBSD_IDXR); 121 outb(value, host->base + WBSD_DATAR); 122 } 123 124 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index) 125 { 126 outb(index, host->base + WBSD_IDXR); 127 return inb(host->base + WBSD_DATAR); 128 } 129 130 /* 131 * Common routines 132 */ 133 134 static void wbsd_init_device(struct wbsd_host *host) 135 { 136 u8 setup, ier; 137 138 /* 139 * Reset chip (SD/MMC part) and fifo. 140 */ 141 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 142 setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET; 143 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 144 145 /* 146 * Set DAT3 to input 147 */ 148 setup &= ~WBSD_DAT3_H; 149 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 150 host->flags &= ~WBSD_FIGNORE_DETECT; 151 152 /* 153 * Read back default clock. 154 */ 155 host->clk = wbsd_read_index(host, WBSD_IDX_CLK); 156 157 /* 158 * Power down port. 159 */ 160 outb(WBSD_POWER_N, host->base + WBSD_CSR); 161 162 /* 163 * Set maximum timeout. 164 */ 165 wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F); 166 167 /* 168 * Test for card presence 169 */ 170 if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT) 171 host->flags |= WBSD_FCARD_PRESENT; 172 else 173 host->flags &= ~WBSD_FCARD_PRESENT; 174 175 /* 176 * Enable interesting interrupts. 177 */ 178 ier = 0; 179 ier |= WBSD_EINT_CARD; 180 ier |= WBSD_EINT_FIFO_THRE; 181 ier |= WBSD_EINT_CRC; 182 ier |= WBSD_EINT_TIMEOUT; 183 ier |= WBSD_EINT_TC; 184 185 outb(ier, host->base + WBSD_EIR); 186 187 /* 188 * Clear interrupts. 189 */ 190 inb(host->base + WBSD_ISR); 191 } 192 193 static void wbsd_reset(struct wbsd_host *host) 194 { 195 u8 setup; 196 197 pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc)); 198 199 /* 200 * Soft reset of chip (SD/MMC part). 201 */ 202 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 203 setup |= WBSD_SOFT_RESET; 204 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 205 } 206 207 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq) 208 { 209 unsigned long dmaflags; 210 211 if (host->dma >= 0) { 212 /* 213 * Release ISA DMA controller. 214 */ 215 dmaflags = claim_dma_lock(); 216 disable_dma(host->dma); 217 clear_dma_ff(host->dma); 218 release_dma_lock(dmaflags); 219 220 /* 221 * Disable DMA on host. 222 */ 223 wbsd_write_index(host, WBSD_IDX_DMA, 0); 224 } 225 226 host->mrq = NULL; 227 228 /* 229 * MMC layer might call back into the driver so first unlock. 230 */ 231 spin_unlock(&host->lock); 232 mmc_request_done(host->mmc, mrq); 233 spin_lock(&host->lock); 234 } 235 236 /* 237 * Scatter/gather functions 238 */ 239 240 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data) 241 { 242 /* 243 * Get info. about SG list from data structure. 244 */ 245 host->cur_sg = data->sg; 246 host->num_sg = data->sg_len; 247 248 host->offset = 0; 249 host->remain = host->cur_sg->length; 250 } 251 252 static inline int wbsd_next_sg(struct wbsd_host *host) 253 { 254 /* 255 * Skip to next SG entry. 256 */ 257 host->cur_sg++; 258 host->num_sg--; 259 260 /* 261 * Any entries left? 262 */ 263 if (host->num_sg > 0) { 264 host->offset = 0; 265 host->remain = host->cur_sg->length; 266 } 267 268 return host->num_sg; 269 } 270 271 static inline char *wbsd_sg_to_buffer(struct wbsd_host *host) 272 { 273 return sg_virt(host->cur_sg); 274 } 275 276 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data) 277 { 278 unsigned int len, i; 279 struct scatterlist *sg; 280 char *dmabuf = host->dma_buffer; 281 char *sgbuf; 282 283 sg = data->sg; 284 len = data->sg_len; 285 286 for (i = 0; i < len; i++) { 287 sgbuf = sg_virt(&sg[i]); 288 memcpy(dmabuf, sgbuf, sg[i].length); 289 dmabuf += sg[i].length; 290 } 291 } 292 293 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data) 294 { 295 unsigned int len, i; 296 struct scatterlist *sg; 297 char *dmabuf = host->dma_buffer; 298 char *sgbuf; 299 300 sg = data->sg; 301 len = data->sg_len; 302 303 for (i = 0; i < len; i++) { 304 sgbuf = sg_virt(&sg[i]); 305 memcpy(sgbuf, dmabuf, sg[i].length); 306 dmabuf += sg[i].length; 307 } 308 } 309 310 /* 311 * Command handling 312 */ 313 314 static inline void wbsd_get_short_reply(struct wbsd_host *host, 315 struct mmc_command *cmd) 316 { 317 /* 318 * Correct response type? 319 */ 320 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) { 321 cmd->error = -EILSEQ; 322 return; 323 } 324 325 cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24; 326 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16; 327 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8; 328 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0; 329 cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24; 330 } 331 332 static inline void wbsd_get_long_reply(struct wbsd_host *host, 333 struct mmc_command *cmd) 334 { 335 int i; 336 337 /* 338 * Correct response type? 339 */ 340 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) { 341 cmd->error = -EILSEQ; 342 return; 343 } 344 345 for (i = 0; i < 4; i++) { 346 cmd->resp[i] = 347 wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24; 348 cmd->resp[i] |= 349 wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16; 350 cmd->resp[i] |= 351 wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8; 352 cmd->resp[i] |= 353 wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0; 354 } 355 } 356 357 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd) 358 { 359 int i; 360 u8 status, isr; 361 362 /* 363 * Clear accumulated ISR. The interrupt routine 364 * will fill this one with events that occur during 365 * transfer. 366 */ 367 host->isr = 0; 368 369 /* 370 * Send the command (CRC calculated by host). 371 */ 372 outb(cmd->opcode, host->base + WBSD_CMDR); 373 for (i = 3; i >= 0; i--) 374 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR); 375 376 cmd->error = 0; 377 378 /* 379 * Wait for the request to complete. 380 */ 381 do { 382 status = wbsd_read_index(host, WBSD_IDX_STATUS); 383 } while (status & WBSD_CARDTRAFFIC); 384 385 /* 386 * Do we expect a reply? 387 */ 388 if (cmd->flags & MMC_RSP_PRESENT) { 389 /* 390 * Read back status. 391 */ 392 isr = host->isr; 393 394 /* Card removed? */ 395 if (isr & WBSD_INT_CARD) 396 cmd->error = -ENOMEDIUM; 397 /* Timeout? */ 398 else if (isr & WBSD_INT_TIMEOUT) 399 cmd->error = -ETIMEDOUT; 400 /* CRC? */ 401 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC)) 402 cmd->error = -EILSEQ; 403 /* All ok */ 404 else { 405 if (cmd->flags & MMC_RSP_136) 406 wbsd_get_long_reply(host, cmd); 407 else 408 wbsd_get_short_reply(host, cmd); 409 } 410 } 411 } 412 413 /* 414 * Data functions 415 */ 416 417 static void wbsd_empty_fifo(struct wbsd_host *host) 418 { 419 struct mmc_data *data = host->mrq->cmd->data; 420 char *buffer; 421 int i, fsr, fifo; 422 423 /* 424 * Handle excessive data. 425 */ 426 if (host->num_sg == 0) 427 return; 428 429 buffer = wbsd_sg_to_buffer(host) + host->offset; 430 431 /* 432 * Drain the fifo. This has a tendency to loop longer 433 * than the FIFO length (usually one block). 434 */ 435 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) { 436 /* 437 * The size field in the FSR is broken so we have to 438 * do some guessing. 439 */ 440 if (fsr & WBSD_FIFO_FULL) 441 fifo = 16; 442 else if (fsr & WBSD_FIFO_FUTHRE) 443 fifo = 8; 444 else 445 fifo = 1; 446 447 for (i = 0; i < fifo; i++) { 448 *buffer = inb(host->base + WBSD_DFR); 449 buffer++; 450 host->offset++; 451 host->remain--; 452 453 data->bytes_xfered++; 454 455 /* 456 * End of scatter list entry? 457 */ 458 if (host->remain == 0) { 459 /* 460 * Get next entry. Check if last. 461 */ 462 if (!wbsd_next_sg(host)) 463 return; 464 465 buffer = wbsd_sg_to_buffer(host); 466 } 467 } 468 } 469 470 /* 471 * This is a very dirty hack to solve a 472 * hardware problem. The chip doesn't trigger 473 * FIFO threshold interrupts properly. 474 */ 475 if ((data->blocks * data->blksz - data->bytes_xfered) < 16) 476 tasklet_schedule(&host->fifo_tasklet); 477 } 478 479 static void wbsd_fill_fifo(struct wbsd_host *host) 480 { 481 struct mmc_data *data = host->mrq->cmd->data; 482 char *buffer; 483 int i, fsr, fifo; 484 485 /* 486 * Check that we aren't being called after the 487 * entire buffer has been transferred. 488 */ 489 if (host->num_sg == 0) 490 return; 491 492 buffer = wbsd_sg_to_buffer(host) + host->offset; 493 494 /* 495 * Fill the fifo. This has a tendency to loop longer 496 * than the FIFO length (usually one block). 497 */ 498 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) { 499 /* 500 * The size field in the FSR is broken so we have to 501 * do some guessing. 502 */ 503 if (fsr & WBSD_FIFO_EMPTY) 504 fifo = 0; 505 else if (fsr & WBSD_FIFO_EMTHRE) 506 fifo = 8; 507 else 508 fifo = 15; 509 510 for (i = 16; i > fifo; i--) { 511 outb(*buffer, host->base + WBSD_DFR); 512 buffer++; 513 host->offset++; 514 host->remain--; 515 516 data->bytes_xfered++; 517 518 /* 519 * End of scatter list entry? 520 */ 521 if (host->remain == 0) { 522 /* 523 * Get next entry. Check if last. 524 */ 525 if (!wbsd_next_sg(host)) 526 return; 527 528 buffer = wbsd_sg_to_buffer(host); 529 } 530 } 531 } 532 533 /* 534 * The controller stops sending interrupts for 535 * 'FIFO empty' under certain conditions. So we 536 * need to be a bit more pro-active. 537 */ 538 tasklet_schedule(&host->fifo_tasklet); 539 } 540 541 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data) 542 { 543 u16 blksize; 544 u8 setup; 545 unsigned long dmaflags; 546 unsigned int size; 547 548 /* 549 * Calculate size. 550 */ 551 size = data->blocks * data->blksz; 552 553 /* 554 * Check timeout values for overflow. 555 * (Yes, some cards cause this value to overflow). 556 */ 557 if (data->timeout_ns > 127000000) 558 wbsd_write_index(host, WBSD_IDX_TAAC, 127); 559 else { 560 wbsd_write_index(host, WBSD_IDX_TAAC, 561 data->timeout_ns / 1000000); 562 } 563 564 if (data->timeout_clks > 255) 565 wbsd_write_index(host, WBSD_IDX_NSAC, 255); 566 else 567 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks); 568 569 /* 570 * Inform the chip of how large blocks will be 571 * sent. It needs this to determine when to 572 * calculate CRC. 573 * 574 * Space for CRC must be included in the size. 575 * Two bytes are needed for each data line. 576 */ 577 if (host->bus_width == MMC_BUS_WIDTH_1) { 578 blksize = data->blksz + 2; 579 580 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0); 581 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); 582 } else if (host->bus_width == MMC_BUS_WIDTH_4) { 583 blksize = data->blksz + 2 * 4; 584 585 wbsd_write_index(host, WBSD_IDX_PBSMSB, 586 ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH); 587 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); 588 } else { 589 data->error = -EINVAL; 590 return; 591 } 592 593 /* 594 * Clear the FIFO. This is needed even for DMA 595 * transfers since the chip still uses the FIFO 596 * internally. 597 */ 598 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 599 setup |= WBSD_FIFO_RESET; 600 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 601 602 /* 603 * DMA transfer? 604 */ 605 if (host->dma >= 0) { 606 /* 607 * The buffer for DMA is only 64 kB. 608 */ 609 BUG_ON(size > 0x10000); 610 if (size > 0x10000) { 611 data->error = -EINVAL; 612 return; 613 } 614 615 /* 616 * Transfer data from the SG list to 617 * the DMA buffer. 618 */ 619 if (data->flags & MMC_DATA_WRITE) 620 wbsd_sg_to_dma(host, data); 621 622 /* 623 * Initialise the ISA DMA controller. 624 */ 625 dmaflags = claim_dma_lock(); 626 disable_dma(host->dma); 627 clear_dma_ff(host->dma); 628 if (data->flags & MMC_DATA_READ) 629 set_dma_mode(host->dma, DMA_MODE_READ & ~0x40); 630 else 631 set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40); 632 set_dma_addr(host->dma, host->dma_addr); 633 set_dma_count(host->dma, size); 634 635 enable_dma(host->dma); 636 release_dma_lock(dmaflags); 637 638 /* 639 * Enable DMA on the host. 640 */ 641 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE); 642 } else { 643 /* 644 * This flag is used to keep printk 645 * output to a minimum. 646 */ 647 host->firsterr = 1; 648 649 /* 650 * Initialise the SG list. 651 */ 652 wbsd_init_sg(host, data); 653 654 /* 655 * Turn off DMA. 656 */ 657 wbsd_write_index(host, WBSD_IDX_DMA, 0); 658 659 /* 660 * Set up FIFO threshold levels (and fill 661 * buffer if doing a write). 662 */ 663 if (data->flags & MMC_DATA_READ) { 664 wbsd_write_index(host, WBSD_IDX_FIFOEN, 665 WBSD_FIFOEN_FULL | 8); 666 } else { 667 wbsd_write_index(host, WBSD_IDX_FIFOEN, 668 WBSD_FIFOEN_EMPTY | 8); 669 wbsd_fill_fifo(host); 670 } 671 } 672 673 data->error = 0; 674 } 675 676 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data) 677 { 678 unsigned long dmaflags; 679 int count; 680 u8 status; 681 682 WARN_ON(host->mrq == NULL); 683 684 /* 685 * Send a stop command if needed. 686 */ 687 if (data->stop) 688 wbsd_send_command(host, data->stop); 689 690 /* 691 * Wait for the controller to leave data 692 * transfer state. 693 */ 694 do { 695 status = wbsd_read_index(host, WBSD_IDX_STATUS); 696 } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE)); 697 698 /* 699 * DMA transfer? 700 */ 701 if (host->dma >= 0) { 702 /* 703 * Disable DMA on the host. 704 */ 705 wbsd_write_index(host, WBSD_IDX_DMA, 0); 706 707 /* 708 * Turn of ISA DMA controller. 709 */ 710 dmaflags = claim_dma_lock(); 711 disable_dma(host->dma); 712 clear_dma_ff(host->dma); 713 count = get_dma_residue(host->dma); 714 release_dma_lock(dmaflags); 715 716 data->bytes_xfered = host->mrq->data->blocks * 717 host->mrq->data->blksz - count; 718 data->bytes_xfered -= data->bytes_xfered % data->blksz; 719 720 /* 721 * Any leftover data? 722 */ 723 if (count) { 724 pr_err("%s: Incomplete DMA transfer. " 725 "%d bytes left.\n", 726 mmc_hostname(host->mmc), count); 727 728 if (!data->error) 729 data->error = -EIO; 730 } else { 731 /* 732 * Transfer data from DMA buffer to 733 * SG list. 734 */ 735 if (data->flags & MMC_DATA_READ) 736 wbsd_dma_to_sg(host, data); 737 } 738 739 if (data->error) { 740 if (data->bytes_xfered) 741 data->bytes_xfered -= data->blksz; 742 } 743 } 744 745 wbsd_request_end(host, host->mrq); 746 } 747 748 /*****************************************************************************\ 749 * * 750 * MMC layer callbacks * 751 * * 752 \*****************************************************************************/ 753 754 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq) 755 { 756 struct wbsd_host *host = mmc_priv(mmc); 757 struct mmc_command *cmd; 758 759 /* 760 * Disable tasklets to avoid a deadlock. 761 */ 762 spin_lock_bh(&host->lock); 763 764 BUG_ON(host->mrq != NULL); 765 766 cmd = mrq->cmd; 767 768 host->mrq = mrq; 769 770 /* 771 * Check that there is actually a card in the slot. 772 */ 773 if (!(host->flags & WBSD_FCARD_PRESENT)) { 774 cmd->error = -ENOMEDIUM; 775 goto done; 776 } 777 778 if (cmd->data) { 779 /* 780 * The hardware is so delightfully stupid that it has a list 781 * of "data" commands. If a command isn't on this list, it'll 782 * just go back to the idle state and won't send any data 783 * interrupts. 784 */ 785 switch (cmd->opcode) { 786 case 11: 787 case 17: 788 case 18: 789 case 20: 790 case 24: 791 case 25: 792 case 26: 793 case 27: 794 case 30: 795 case 42: 796 case 56: 797 break; 798 799 /* ACMDs. We don't keep track of state, so we just treat them 800 * like any other command. */ 801 case 51: 802 break; 803 804 default: 805 #ifdef CONFIG_MMC_DEBUG 806 pr_warning("%s: Data command %d is not " 807 "supported by this controller.\n", 808 mmc_hostname(host->mmc), cmd->opcode); 809 #endif 810 cmd->error = -EINVAL; 811 812 goto done; 813 }; 814 } 815 816 /* 817 * Does the request include data? 818 */ 819 if (cmd->data) { 820 wbsd_prepare_data(host, cmd->data); 821 822 if (cmd->data->error) 823 goto done; 824 } 825 826 wbsd_send_command(host, cmd); 827 828 /* 829 * If this is a data transfer the request 830 * will be finished after the data has 831 * transferred. 832 */ 833 if (cmd->data && !cmd->error) { 834 /* 835 * Dirty fix for hardware bug. 836 */ 837 if (host->dma == -1) 838 tasklet_schedule(&host->fifo_tasklet); 839 840 spin_unlock_bh(&host->lock); 841 842 return; 843 } 844 845 done: 846 wbsd_request_end(host, mrq); 847 848 spin_unlock_bh(&host->lock); 849 } 850 851 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 852 { 853 struct wbsd_host *host = mmc_priv(mmc); 854 u8 clk, setup, pwr; 855 856 spin_lock_bh(&host->lock); 857 858 /* 859 * Reset the chip on each power off. 860 * Should clear out any weird states. 861 */ 862 if (ios->power_mode == MMC_POWER_OFF) 863 wbsd_init_device(host); 864 865 if (ios->clock >= 24000000) 866 clk = WBSD_CLK_24M; 867 else if (ios->clock >= 16000000) 868 clk = WBSD_CLK_16M; 869 else if (ios->clock >= 12000000) 870 clk = WBSD_CLK_12M; 871 else 872 clk = WBSD_CLK_375K; 873 874 /* 875 * Only write to the clock register when 876 * there is an actual change. 877 */ 878 if (clk != host->clk) { 879 wbsd_write_index(host, WBSD_IDX_CLK, clk); 880 host->clk = clk; 881 } 882 883 /* 884 * Power up card. 885 */ 886 if (ios->power_mode != MMC_POWER_OFF) { 887 pwr = inb(host->base + WBSD_CSR); 888 pwr &= ~WBSD_POWER_N; 889 outb(pwr, host->base + WBSD_CSR); 890 } 891 892 /* 893 * MMC cards need to have pin 1 high during init. 894 * It wreaks havoc with the card detection though so 895 * that needs to be disabled. 896 */ 897 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 898 if (ios->chip_select == MMC_CS_HIGH) { 899 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1); 900 setup |= WBSD_DAT3_H; 901 host->flags |= WBSD_FIGNORE_DETECT; 902 } else { 903 if (setup & WBSD_DAT3_H) { 904 setup &= ~WBSD_DAT3_H; 905 906 /* 907 * We cannot resume card detection immediately 908 * because of capacitance and delays in the chip. 909 */ 910 mod_timer(&host->ignore_timer, jiffies + HZ / 100); 911 } 912 } 913 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 914 915 /* 916 * Store bus width for later. Will be used when 917 * setting up the data transfer. 918 */ 919 host->bus_width = ios->bus_width; 920 921 spin_unlock_bh(&host->lock); 922 } 923 924 static int wbsd_get_ro(struct mmc_host *mmc) 925 { 926 struct wbsd_host *host = mmc_priv(mmc); 927 u8 csr; 928 929 spin_lock_bh(&host->lock); 930 931 csr = inb(host->base + WBSD_CSR); 932 csr |= WBSD_MSLED; 933 outb(csr, host->base + WBSD_CSR); 934 935 mdelay(1); 936 937 csr = inb(host->base + WBSD_CSR); 938 csr &= ~WBSD_MSLED; 939 outb(csr, host->base + WBSD_CSR); 940 941 spin_unlock_bh(&host->lock); 942 943 return !!(csr & WBSD_WRPT); 944 } 945 946 static const struct mmc_host_ops wbsd_ops = { 947 .request = wbsd_request, 948 .set_ios = wbsd_set_ios, 949 .get_ro = wbsd_get_ro, 950 }; 951 952 /*****************************************************************************\ 953 * * 954 * Interrupt handling * 955 * * 956 \*****************************************************************************/ 957 958 /* 959 * Helper function to reset detection ignore 960 */ 961 962 static void wbsd_reset_ignore(unsigned long data) 963 { 964 struct wbsd_host *host = (struct wbsd_host *)data; 965 966 BUG_ON(host == NULL); 967 968 DBG("Resetting card detection ignore\n"); 969 970 spin_lock_bh(&host->lock); 971 972 host->flags &= ~WBSD_FIGNORE_DETECT; 973 974 /* 975 * Card status might have changed during the 976 * blackout. 977 */ 978 tasklet_schedule(&host->card_tasklet); 979 980 spin_unlock_bh(&host->lock); 981 } 982 983 /* 984 * Tasklets 985 */ 986 987 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host) 988 { 989 WARN_ON(!host->mrq); 990 if (!host->mrq) 991 return NULL; 992 993 WARN_ON(!host->mrq->cmd); 994 if (!host->mrq->cmd) 995 return NULL; 996 997 WARN_ON(!host->mrq->cmd->data); 998 if (!host->mrq->cmd->data) 999 return NULL; 1000 1001 return host->mrq->cmd->data; 1002 } 1003 1004 static void wbsd_tasklet_card(unsigned long param) 1005 { 1006 struct wbsd_host *host = (struct wbsd_host *)param; 1007 u8 csr; 1008 int delay = -1; 1009 1010 spin_lock(&host->lock); 1011 1012 if (host->flags & WBSD_FIGNORE_DETECT) { 1013 spin_unlock(&host->lock); 1014 return; 1015 } 1016 1017 csr = inb(host->base + WBSD_CSR); 1018 WARN_ON(csr == 0xff); 1019 1020 if (csr & WBSD_CARDPRESENT) { 1021 if (!(host->flags & WBSD_FCARD_PRESENT)) { 1022 DBG("Card inserted\n"); 1023 host->flags |= WBSD_FCARD_PRESENT; 1024 1025 delay = 500; 1026 } 1027 } else if (host->flags & WBSD_FCARD_PRESENT) { 1028 DBG("Card removed\n"); 1029 host->flags &= ~WBSD_FCARD_PRESENT; 1030 1031 if (host->mrq) { 1032 pr_err("%s: Card removed during transfer!\n", 1033 mmc_hostname(host->mmc)); 1034 wbsd_reset(host); 1035 1036 host->mrq->cmd->error = -ENOMEDIUM; 1037 tasklet_schedule(&host->finish_tasklet); 1038 } 1039 1040 delay = 0; 1041 } 1042 1043 /* 1044 * Unlock first since we might get a call back. 1045 */ 1046 1047 spin_unlock(&host->lock); 1048 1049 if (delay != -1) 1050 mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); 1051 } 1052 1053 static void wbsd_tasklet_fifo(unsigned long param) 1054 { 1055 struct wbsd_host *host = (struct wbsd_host *)param; 1056 struct mmc_data *data; 1057 1058 spin_lock(&host->lock); 1059 1060 if (!host->mrq) 1061 goto end; 1062 1063 data = wbsd_get_data(host); 1064 if (!data) 1065 goto end; 1066 1067 if (data->flags & MMC_DATA_WRITE) 1068 wbsd_fill_fifo(host); 1069 else 1070 wbsd_empty_fifo(host); 1071 1072 /* 1073 * Done? 1074 */ 1075 if (host->num_sg == 0) { 1076 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); 1077 tasklet_schedule(&host->finish_tasklet); 1078 } 1079 1080 end: 1081 spin_unlock(&host->lock); 1082 } 1083 1084 static void wbsd_tasklet_crc(unsigned long param) 1085 { 1086 struct wbsd_host *host = (struct wbsd_host *)param; 1087 struct mmc_data *data; 1088 1089 spin_lock(&host->lock); 1090 1091 if (!host->mrq) 1092 goto end; 1093 1094 data = wbsd_get_data(host); 1095 if (!data) 1096 goto end; 1097 1098 DBGF("CRC error\n"); 1099 1100 data->error = -EILSEQ; 1101 1102 tasklet_schedule(&host->finish_tasklet); 1103 1104 end: 1105 spin_unlock(&host->lock); 1106 } 1107 1108 static void wbsd_tasklet_timeout(unsigned long param) 1109 { 1110 struct wbsd_host *host = (struct wbsd_host *)param; 1111 struct mmc_data *data; 1112 1113 spin_lock(&host->lock); 1114 1115 if (!host->mrq) 1116 goto end; 1117 1118 data = wbsd_get_data(host); 1119 if (!data) 1120 goto end; 1121 1122 DBGF("Timeout\n"); 1123 1124 data->error = -ETIMEDOUT; 1125 1126 tasklet_schedule(&host->finish_tasklet); 1127 1128 end: 1129 spin_unlock(&host->lock); 1130 } 1131 1132 static void wbsd_tasklet_finish(unsigned long param) 1133 { 1134 struct wbsd_host *host = (struct wbsd_host *)param; 1135 struct mmc_data *data; 1136 1137 spin_lock(&host->lock); 1138 1139 WARN_ON(!host->mrq); 1140 if (!host->mrq) 1141 goto end; 1142 1143 data = wbsd_get_data(host); 1144 if (!data) 1145 goto end; 1146 1147 wbsd_finish_data(host, data); 1148 1149 end: 1150 spin_unlock(&host->lock); 1151 } 1152 1153 /* 1154 * Interrupt handling 1155 */ 1156 1157 static irqreturn_t wbsd_irq(int irq, void *dev_id) 1158 { 1159 struct wbsd_host *host = dev_id; 1160 int isr; 1161 1162 isr = inb(host->base + WBSD_ISR); 1163 1164 /* 1165 * Was it actually our hardware that caused the interrupt? 1166 */ 1167 if (isr == 0xff || isr == 0x00) 1168 return IRQ_NONE; 1169 1170 host->isr |= isr; 1171 1172 /* 1173 * Schedule tasklets as needed. 1174 */ 1175 if (isr & WBSD_INT_CARD) 1176 tasklet_schedule(&host->card_tasklet); 1177 if (isr & WBSD_INT_FIFO_THRE) 1178 tasklet_schedule(&host->fifo_tasklet); 1179 if (isr & WBSD_INT_CRC) 1180 tasklet_hi_schedule(&host->crc_tasklet); 1181 if (isr & WBSD_INT_TIMEOUT) 1182 tasklet_hi_schedule(&host->timeout_tasklet); 1183 if (isr & WBSD_INT_TC) 1184 tasklet_schedule(&host->finish_tasklet); 1185 1186 return IRQ_HANDLED; 1187 } 1188 1189 /*****************************************************************************\ 1190 * * 1191 * Device initialisation and shutdown * 1192 * * 1193 \*****************************************************************************/ 1194 1195 /* 1196 * Allocate/free MMC structure. 1197 */ 1198 1199 static int wbsd_alloc_mmc(struct device *dev) 1200 { 1201 struct mmc_host *mmc; 1202 struct wbsd_host *host; 1203 1204 /* 1205 * Allocate MMC structure. 1206 */ 1207 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); 1208 if (!mmc) 1209 return -ENOMEM; 1210 1211 host = mmc_priv(mmc); 1212 host->mmc = mmc; 1213 1214 host->dma = -1; 1215 1216 /* 1217 * Set host parameters. 1218 */ 1219 mmc->ops = &wbsd_ops; 1220 mmc->f_min = 375000; 1221 mmc->f_max = 24000000; 1222 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 1223 mmc->caps = MMC_CAP_4_BIT_DATA; 1224 1225 spin_lock_init(&host->lock); 1226 1227 /* 1228 * Set up timers 1229 */ 1230 init_timer(&host->ignore_timer); 1231 host->ignore_timer.data = (unsigned long)host; 1232 host->ignore_timer.function = wbsd_reset_ignore; 1233 1234 /* 1235 * Maximum number of segments. Worst case is one sector per segment 1236 * so this will be 64kB/512. 1237 */ 1238 mmc->max_segs = 128; 1239 1240 /* 1241 * Maximum request size. Also limited by 64KiB buffer. 1242 */ 1243 mmc->max_req_size = 65536; 1244 1245 /* 1246 * Maximum segment size. Could be one segment with the maximum number 1247 * of bytes. 1248 */ 1249 mmc->max_seg_size = mmc->max_req_size; 1250 1251 /* 1252 * Maximum block size. We have 12 bits (= 4095) but have to subtract 1253 * space for CRC. So the maximum is 4095 - 4*2 = 4087. 1254 */ 1255 mmc->max_blk_size = 4087; 1256 1257 /* 1258 * Maximum block count. There is no real limit so the maximum 1259 * request size will be the only restriction. 1260 */ 1261 mmc->max_blk_count = mmc->max_req_size; 1262 1263 dev_set_drvdata(dev, mmc); 1264 1265 return 0; 1266 } 1267 1268 static void wbsd_free_mmc(struct device *dev) 1269 { 1270 struct mmc_host *mmc; 1271 struct wbsd_host *host; 1272 1273 mmc = dev_get_drvdata(dev); 1274 if (!mmc) 1275 return; 1276 1277 host = mmc_priv(mmc); 1278 BUG_ON(host == NULL); 1279 1280 del_timer_sync(&host->ignore_timer); 1281 1282 mmc_free_host(mmc); 1283 1284 dev_set_drvdata(dev, NULL); 1285 } 1286 1287 /* 1288 * Scan for known chip id:s 1289 */ 1290 1291 static int wbsd_scan(struct wbsd_host *host) 1292 { 1293 int i, j, k; 1294 int id; 1295 1296 /* 1297 * Iterate through all ports, all codes to 1298 * find hardware that is in our known list. 1299 */ 1300 for (i = 0; i < ARRAY_SIZE(config_ports); i++) { 1301 if (!request_region(config_ports[i], 2, DRIVER_NAME)) 1302 continue; 1303 1304 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) { 1305 id = 0xFFFF; 1306 1307 host->config = config_ports[i]; 1308 host->unlock_code = unlock_codes[j]; 1309 1310 wbsd_unlock_config(host); 1311 1312 outb(WBSD_CONF_ID_HI, config_ports[i]); 1313 id = inb(config_ports[i] + 1) << 8; 1314 1315 outb(WBSD_CONF_ID_LO, config_ports[i]); 1316 id |= inb(config_ports[i] + 1); 1317 1318 wbsd_lock_config(host); 1319 1320 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) { 1321 if (id == valid_ids[k]) { 1322 host->chip_id = id; 1323 1324 return 0; 1325 } 1326 } 1327 1328 if (id != 0xFFFF) { 1329 DBG("Unknown hardware (id %x) found at %x\n", 1330 id, config_ports[i]); 1331 } 1332 } 1333 1334 release_region(config_ports[i], 2); 1335 } 1336 1337 host->config = 0; 1338 host->unlock_code = 0; 1339 1340 return -ENODEV; 1341 } 1342 1343 /* 1344 * Allocate/free io port ranges 1345 */ 1346 1347 static int wbsd_request_region(struct wbsd_host *host, int base) 1348 { 1349 if (base & 0x7) 1350 return -EINVAL; 1351 1352 if (!request_region(base, 8, DRIVER_NAME)) 1353 return -EIO; 1354 1355 host->base = base; 1356 1357 return 0; 1358 } 1359 1360 static void wbsd_release_regions(struct wbsd_host *host) 1361 { 1362 if (host->base) 1363 release_region(host->base, 8); 1364 1365 host->base = 0; 1366 1367 if (host->config) 1368 release_region(host->config, 2); 1369 1370 host->config = 0; 1371 } 1372 1373 /* 1374 * Allocate/free DMA port and buffer 1375 */ 1376 1377 static void wbsd_request_dma(struct wbsd_host *host, int dma) 1378 { 1379 if (dma < 0) 1380 return; 1381 1382 if (request_dma(dma, DRIVER_NAME)) 1383 goto err; 1384 1385 /* 1386 * We need to allocate a special buffer in 1387 * order for ISA to be able to DMA to it. 1388 */ 1389 host->dma_buffer = kmalloc(WBSD_DMA_SIZE, 1390 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN); 1391 if (!host->dma_buffer) 1392 goto free; 1393 1394 /* 1395 * Translate the address to a physical address. 1396 */ 1397 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer, 1398 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1399 1400 /* 1401 * ISA DMA must be aligned on a 64k basis. 1402 */ 1403 if ((host->dma_addr & 0xffff) != 0) 1404 goto kfree; 1405 /* 1406 * ISA cannot access memory above 16 MB. 1407 */ 1408 else if (host->dma_addr >= 0x1000000) 1409 goto kfree; 1410 1411 host->dma = dma; 1412 1413 return; 1414 1415 kfree: 1416 /* 1417 * If we've gotten here then there is some kind of alignment bug 1418 */ 1419 BUG_ON(1); 1420 1421 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1422 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1423 host->dma_addr = 0; 1424 1425 kfree(host->dma_buffer); 1426 host->dma_buffer = NULL; 1427 1428 free: 1429 free_dma(dma); 1430 1431 err: 1432 pr_warning(DRIVER_NAME ": Unable to allocate DMA %d. " 1433 "Falling back on FIFO.\n", dma); 1434 } 1435 1436 static void wbsd_release_dma(struct wbsd_host *host) 1437 { 1438 if (host->dma_addr) { 1439 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1440 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1441 } 1442 kfree(host->dma_buffer); 1443 if (host->dma >= 0) 1444 free_dma(host->dma); 1445 1446 host->dma = -1; 1447 host->dma_buffer = NULL; 1448 host->dma_addr = 0; 1449 } 1450 1451 /* 1452 * Allocate/free IRQ. 1453 */ 1454 1455 static int wbsd_request_irq(struct wbsd_host *host, int irq) 1456 { 1457 int ret; 1458 1459 /* 1460 * Set up tasklets. Must be done before requesting interrupt. 1461 */ 1462 tasklet_init(&host->card_tasklet, wbsd_tasklet_card, 1463 (unsigned long)host); 1464 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, 1465 (unsigned long)host); 1466 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, 1467 (unsigned long)host); 1468 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, 1469 (unsigned long)host); 1470 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, 1471 (unsigned long)host); 1472 1473 /* 1474 * Allocate interrupt. 1475 */ 1476 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host); 1477 if (ret) 1478 return ret; 1479 1480 host->irq = irq; 1481 1482 return 0; 1483 } 1484 1485 static void wbsd_release_irq(struct wbsd_host *host) 1486 { 1487 if (!host->irq) 1488 return; 1489 1490 free_irq(host->irq, host); 1491 1492 host->irq = 0; 1493 1494 tasklet_kill(&host->card_tasklet); 1495 tasklet_kill(&host->fifo_tasklet); 1496 tasklet_kill(&host->crc_tasklet); 1497 tasklet_kill(&host->timeout_tasklet); 1498 tasklet_kill(&host->finish_tasklet); 1499 } 1500 1501 /* 1502 * Allocate all resources for the host. 1503 */ 1504 1505 static int wbsd_request_resources(struct wbsd_host *host, 1506 int base, int irq, int dma) 1507 { 1508 int ret; 1509 1510 /* 1511 * Allocate I/O ports. 1512 */ 1513 ret = wbsd_request_region(host, base); 1514 if (ret) 1515 return ret; 1516 1517 /* 1518 * Allocate interrupt. 1519 */ 1520 ret = wbsd_request_irq(host, irq); 1521 if (ret) 1522 return ret; 1523 1524 /* 1525 * Allocate DMA. 1526 */ 1527 wbsd_request_dma(host, dma); 1528 1529 return 0; 1530 } 1531 1532 /* 1533 * Release all resources for the host. 1534 */ 1535 1536 static void wbsd_release_resources(struct wbsd_host *host) 1537 { 1538 wbsd_release_dma(host); 1539 wbsd_release_irq(host); 1540 wbsd_release_regions(host); 1541 } 1542 1543 /* 1544 * Configure the resources the chip should use. 1545 */ 1546 1547 static void wbsd_chip_config(struct wbsd_host *host) 1548 { 1549 wbsd_unlock_config(host); 1550 1551 /* 1552 * Reset the chip. 1553 */ 1554 wbsd_write_config(host, WBSD_CONF_SWRST, 1); 1555 wbsd_write_config(host, WBSD_CONF_SWRST, 0); 1556 1557 /* 1558 * Select SD/MMC function. 1559 */ 1560 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1561 1562 /* 1563 * Set up card detection. 1564 */ 1565 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11); 1566 1567 /* 1568 * Configure chip 1569 */ 1570 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); 1571 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); 1572 1573 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); 1574 1575 if (host->dma >= 0) 1576 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); 1577 1578 /* 1579 * Enable and power up chip. 1580 */ 1581 wbsd_write_config(host, WBSD_CONF_ENABLE, 1); 1582 wbsd_write_config(host, WBSD_CONF_POWER, 0x20); 1583 1584 wbsd_lock_config(host); 1585 } 1586 1587 /* 1588 * Check that configured resources are correct. 1589 */ 1590 1591 static int wbsd_chip_validate(struct wbsd_host *host) 1592 { 1593 int base, irq, dma; 1594 1595 wbsd_unlock_config(host); 1596 1597 /* 1598 * Select SD/MMC function. 1599 */ 1600 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1601 1602 /* 1603 * Read configuration. 1604 */ 1605 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8; 1606 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO); 1607 1608 irq = wbsd_read_config(host, WBSD_CONF_IRQ); 1609 1610 dma = wbsd_read_config(host, WBSD_CONF_DRQ); 1611 1612 wbsd_lock_config(host); 1613 1614 /* 1615 * Validate against given configuration. 1616 */ 1617 if (base != host->base) 1618 return 0; 1619 if (irq != host->irq) 1620 return 0; 1621 if ((dma != host->dma) && (host->dma != -1)) 1622 return 0; 1623 1624 return 1; 1625 } 1626 1627 /* 1628 * Powers down the SD function 1629 */ 1630 1631 static void wbsd_chip_poweroff(struct wbsd_host *host) 1632 { 1633 wbsd_unlock_config(host); 1634 1635 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1636 wbsd_write_config(host, WBSD_CONF_ENABLE, 0); 1637 1638 wbsd_lock_config(host); 1639 } 1640 1641 /*****************************************************************************\ 1642 * * 1643 * Devices setup and shutdown * 1644 * * 1645 \*****************************************************************************/ 1646 1647 static int wbsd_init(struct device *dev, int base, int irq, int dma, 1648 int pnp) 1649 { 1650 struct wbsd_host *host = NULL; 1651 struct mmc_host *mmc = NULL; 1652 int ret; 1653 1654 ret = wbsd_alloc_mmc(dev); 1655 if (ret) 1656 return ret; 1657 1658 mmc = dev_get_drvdata(dev); 1659 host = mmc_priv(mmc); 1660 1661 /* 1662 * Scan for hardware. 1663 */ 1664 ret = wbsd_scan(host); 1665 if (ret) { 1666 if (pnp && (ret == -ENODEV)) { 1667 pr_warning(DRIVER_NAME 1668 ": Unable to confirm device presence. You may " 1669 "experience lock-ups.\n"); 1670 } else { 1671 wbsd_free_mmc(dev); 1672 return ret; 1673 } 1674 } 1675 1676 /* 1677 * Request resources. 1678 */ 1679 ret = wbsd_request_resources(host, base, irq, dma); 1680 if (ret) { 1681 wbsd_release_resources(host); 1682 wbsd_free_mmc(dev); 1683 return ret; 1684 } 1685 1686 /* 1687 * See if chip needs to be configured. 1688 */ 1689 if (pnp) { 1690 if ((host->config != 0) && !wbsd_chip_validate(host)) { 1691 pr_warning(DRIVER_NAME 1692 ": PnP active but chip not configured! " 1693 "You probably have a buggy BIOS. " 1694 "Configuring chip manually.\n"); 1695 wbsd_chip_config(host); 1696 } 1697 } else 1698 wbsd_chip_config(host); 1699 1700 /* 1701 * Power Management stuff. No idea how this works. 1702 * Not tested. 1703 */ 1704 #ifdef CONFIG_PM 1705 if (host->config) { 1706 wbsd_unlock_config(host); 1707 wbsd_write_config(host, WBSD_CONF_PME, 0xA0); 1708 wbsd_lock_config(host); 1709 } 1710 #endif 1711 /* 1712 * Allow device to initialise itself properly. 1713 */ 1714 mdelay(5); 1715 1716 /* 1717 * Reset the chip into a known state. 1718 */ 1719 wbsd_init_device(host); 1720 1721 mmc_add_host(mmc); 1722 1723 pr_info("%s: W83L51xD", mmc_hostname(mmc)); 1724 if (host->chip_id != 0) 1725 printk(" id %x", (int)host->chip_id); 1726 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq); 1727 if (host->dma >= 0) 1728 printk(" dma %d", (int)host->dma); 1729 else 1730 printk(" FIFO"); 1731 if (pnp) 1732 printk(" PnP"); 1733 printk("\n"); 1734 1735 return 0; 1736 } 1737 1738 static void wbsd_shutdown(struct device *dev, int pnp) 1739 { 1740 struct mmc_host *mmc = dev_get_drvdata(dev); 1741 struct wbsd_host *host; 1742 1743 if (!mmc) 1744 return; 1745 1746 host = mmc_priv(mmc); 1747 1748 mmc_remove_host(mmc); 1749 1750 /* 1751 * Power down the SD/MMC function. 1752 */ 1753 if (!pnp) 1754 wbsd_chip_poweroff(host); 1755 1756 wbsd_release_resources(host); 1757 1758 wbsd_free_mmc(dev); 1759 } 1760 1761 /* 1762 * Non-PnP 1763 */ 1764 1765 static int wbsd_probe(struct platform_device *dev) 1766 { 1767 /* Use the module parameters for resources */ 1768 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0); 1769 } 1770 1771 static int wbsd_remove(struct platform_device *dev) 1772 { 1773 wbsd_shutdown(&dev->dev, 0); 1774 1775 return 0; 1776 } 1777 1778 /* 1779 * PnP 1780 */ 1781 1782 #ifdef CONFIG_PNP 1783 1784 static int 1785 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id) 1786 { 1787 int io, irq, dma; 1788 1789 /* 1790 * Get resources from PnP layer. 1791 */ 1792 io = pnp_port_start(pnpdev, 0); 1793 irq = pnp_irq(pnpdev, 0); 1794 if (pnp_dma_valid(pnpdev, 0)) 1795 dma = pnp_dma(pnpdev, 0); 1796 else 1797 dma = -1; 1798 1799 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma); 1800 1801 return wbsd_init(&pnpdev->dev, io, irq, dma, 1); 1802 } 1803 1804 static void wbsd_pnp_remove(struct pnp_dev *dev) 1805 { 1806 wbsd_shutdown(&dev->dev, 1); 1807 } 1808 1809 #endif /* CONFIG_PNP */ 1810 1811 /* 1812 * Power management 1813 */ 1814 1815 #ifdef CONFIG_PM 1816 1817 static int wbsd_platform_suspend(struct platform_device *dev, 1818 pm_message_t state) 1819 { 1820 struct mmc_host *mmc = platform_get_drvdata(dev); 1821 struct wbsd_host *host; 1822 1823 if (mmc == NULL) 1824 return 0; 1825 1826 DBGF("Suspending...\n"); 1827 1828 host = mmc_priv(mmc); 1829 1830 wbsd_chip_poweroff(host); 1831 return 0; 1832 } 1833 1834 static int wbsd_platform_resume(struct platform_device *dev) 1835 { 1836 struct mmc_host *mmc = platform_get_drvdata(dev); 1837 struct wbsd_host *host; 1838 1839 if (mmc == NULL) 1840 return 0; 1841 1842 DBGF("Resuming...\n"); 1843 1844 host = mmc_priv(mmc); 1845 1846 wbsd_chip_config(host); 1847 1848 /* 1849 * Allow device to initialise itself properly. 1850 */ 1851 mdelay(5); 1852 1853 wbsd_init_device(host); 1854 return 0; 1855 } 1856 1857 #ifdef CONFIG_PNP 1858 1859 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state) 1860 { 1861 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1862 struct wbsd_host *host; 1863 1864 if (mmc == NULL) 1865 return 0; 1866 1867 DBGF("Suspending...\n"); 1868 return 0; 1869 } 1870 1871 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev) 1872 { 1873 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1874 struct wbsd_host *host; 1875 1876 if (mmc == NULL) 1877 return 0; 1878 1879 DBGF("Resuming...\n"); 1880 1881 host = mmc_priv(mmc); 1882 1883 /* 1884 * See if chip needs to be configured. 1885 */ 1886 if (host->config != 0) { 1887 if (!wbsd_chip_validate(host)) { 1888 pr_warning(DRIVER_NAME 1889 ": PnP active but chip not configured! " 1890 "You probably have a buggy BIOS. " 1891 "Configuring chip manually.\n"); 1892 wbsd_chip_config(host); 1893 } 1894 } 1895 1896 /* 1897 * Allow device to initialise itself properly. 1898 */ 1899 mdelay(5); 1900 1901 wbsd_init_device(host); 1902 return 0; 1903 } 1904 1905 #endif /* CONFIG_PNP */ 1906 1907 #else /* CONFIG_PM */ 1908 1909 #define wbsd_platform_suspend NULL 1910 #define wbsd_platform_resume NULL 1911 1912 #define wbsd_pnp_suspend NULL 1913 #define wbsd_pnp_resume NULL 1914 1915 #endif /* CONFIG_PM */ 1916 1917 static struct platform_device *wbsd_device; 1918 1919 static struct platform_driver wbsd_driver = { 1920 .probe = wbsd_probe, 1921 .remove = wbsd_remove, 1922 1923 .suspend = wbsd_platform_suspend, 1924 .resume = wbsd_platform_resume, 1925 .driver = { 1926 .name = DRIVER_NAME, 1927 .owner = THIS_MODULE, 1928 }, 1929 }; 1930 1931 #ifdef CONFIG_PNP 1932 1933 static struct pnp_driver wbsd_pnp_driver = { 1934 .name = DRIVER_NAME, 1935 .id_table = pnp_dev_table, 1936 .probe = wbsd_pnp_probe, 1937 .remove = wbsd_pnp_remove, 1938 1939 .suspend = wbsd_pnp_suspend, 1940 .resume = wbsd_pnp_resume, 1941 }; 1942 1943 #endif /* CONFIG_PNP */ 1944 1945 /* 1946 * Module loading/unloading 1947 */ 1948 1949 static int __init wbsd_drv_init(void) 1950 { 1951 int result; 1952 1953 pr_info(DRIVER_NAME 1954 ": Winbond W83L51xD SD/MMC card interface driver\n"); 1955 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 1956 1957 #ifdef CONFIG_PNP 1958 1959 if (!param_nopnp) { 1960 result = pnp_register_driver(&wbsd_pnp_driver); 1961 if (result < 0) 1962 return result; 1963 } 1964 #endif /* CONFIG_PNP */ 1965 1966 if (param_nopnp) { 1967 result = platform_driver_register(&wbsd_driver); 1968 if (result < 0) 1969 return result; 1970 1971 wbsd_device = platform_device_alloc(DRIVER_NAME, -1); 1972 if (!wbsd_device) { 1973 platform_driver_unregister(&wbsd_driver); 1974 return -ENOMEM; 1975 } 1976 1977 result = platform_device_add(wbsd_device); 1978 if (result) { 1979 platform_device_put(wbsd_device); 1980 platform_driver_unregister(&wbsd_driver); 1981 return result; 1982 } 1983 } 1984 1985 return 0; 1986 } 1987 1988 static void __exit wbsd_drv_exit(void) 1989 { 1990 #ifdef CONFIG_PNP 1991 1992 if (!param_nopnp) 1993 pnp_unregister_driver(&wbsd_pnp_driver); 1994 1995 #endif /* CONFIG_PNP */ 1996 1997 if (param_nopnp) { 1998 platform_device_unregister(wbsd_device); 1999 2000 platform_driver_unregister(&wbsd_driver); 2001 } 2002 2003 DBG("unloaded\n"); 2004 } 2005 2006 module_init(wbsd_drv_init); 2007 module_exit(wbsd_drv_exit); 2008 #ifdef CONFIG_PNP 2009 module_param_named(nopnp, param_nopnp, uint, 0444); 2010 #endif 2011 module_param_named(io, param_io, uint, 0444); 2012 module_param_named(irq, param_irq, uint, 0444); 2013 module_param_named(dma, param_dma, int, 0444); 2014 2015 MODULE_LICENSE("GPL"); 2016 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 2017 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); 2018 2019 #ifdef CONFIG_PNP 2020 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)"); 2021 #endif 2022 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); 2023 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); 2024 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)"); 2025