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_warn("%s: Data command %d is not supported by this controller\n", 807 mmc_hostname(host->mmc), cmd->opcode); 808 #endif 809 cmd->error = -EINVAL; 810 811 goto done; 812 } 813 } 814 815 /* 816 * Does the request include data? 817 */ 818 if (cmd->data) { 819 wbsd_prepare_data(host, cmd->data); 820 821 if (cmd->data->error) 822 goto done; 823 } 824 825 wbsd_send_command(host, cmd); 826 827 /* 828 * If this is a data transfer the request 829 * will be finished after the data has 830 * transferred. 831 */ 832 if (cmd->data && !cmd->error) { 833 /* 834 * Dirty fix for hardware bug. 835 */ 836 if (host->dma == -1) 837 tasklet_schedule(&host->fifo_tasklet); 838 839 spin_unlock_bh(&host->lock); 840 841 return; 842 } 843 844 done: 845 wbsd_request_end(host, mrq); 846 847 spin_unlock_bh(&host->lock); 848 } 849 850 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 851 { 852 struct wbsd_host *host = mmc_priv(mmc); 853 u8 clk, setup, pwr; 854 855 spin_lock_bh(&host->lock); 856 857 /* 858 * Reset the chip on each power off. 859 * Should clear out any weird states. 860 */ 861 if (ios->power_mode == MMC_POWER_OFF) 862 wbsd_init_device(host); 863 864 if (ios->clock >= 24000000) 865 clk = WBSD_CLK_24M; 866 else if (ios->clock >= 16000000) 867 clk = WBSD_CLK_16M; 868 else if (ios->clock >= 12000000) 869 clk = WBSD_CLK_12M; 870 else 871 clk = WBSD_CLK_375K; 872 873 /* 874 * Only write to the clock register when 875 * there is an actual change. 876 */ 877 if (clk != host->clk) { 878 wbsd_write_index(host, WBSD_IDX_CLK, clk); 879 host->clk = clk; 880 } 881 882 /* 883 * Power up card. 884 */ 885 if (ios->power_mode != MMC_POWER_OFF) { 886 pwr = inb(host->base + WBSD_CSR); 887 pwr &= ~WBSD_POWER_N; 888 outb(pwr, host->base + WBSD_CSR); 889 } 890 891 /* 892 * MMC cards need to have pin 1 high during init. 893 * It wreaks havoc with the card detection though so 894 * that needs to be disabled. 895 */ 896 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 897 if (ios->chip_select == MMC_CS_HIGH) { 898 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1); 899 setup |= WBSD_DAT3_H; 900 host->flags |= WBSD_FIGNORE_DETECT; 901 } else { 902 if (setup & WBSD_DAT3_H) { 903 setup &= ~WBSD_DAT3_H; 904 905 /* 906 * We cannot resume card detection immediately 907 * because of capacitance and delays in the chip. 908 */ 909 mod_timer(&host->ignore_timer, jiffies + HZ / 100); 910 } 911 } 912 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 913 914 /* 915 * Store bus width for later. Will be used when 916 * setting up the data transfer. 917 */ 918 host->bus_width = ios->bus_width; 919 920 spin_unlock_bh(&host->lock); 921 } 922 923 static int wbsd_get_ro(struct mmc_host *mmc) 924 { 925 struct wbsd_host *host = mmc_priv(mmc); 926 u8 csr; 927 928 spin_lock_bh(&host->lock); 929 930 csr = inb(host->base + WBSD_CSR); 931 csr |= WBSD_MSLED; 932 outb(csr, host->base + WBSD_CSR); 933 934 mdelay(1); 935 936 csr = inb(host->base + WBSD_CSR); 937 csr &= ~WBSD_MSLED; 938 outb(csr, host->base + WBSD_CSR); 939 940 spin_unlock_bh(&host->lock); 941 942 return !!(csr & WBSD_WRPT); 943 } 944 945 static const struct mmc_host_ops wbsd_ops = { 946 .request = wbsd_request, 947 .set_ios = wbsd_set_ios, 948 .get_ro = wbsd_get_ro, 949 }; 950 951 /*****************************************************************************\ 952 * * 953 * Interrupt handling * 954 * * 955 \*****************************************************************************/ 956 957 /* 958 * Helper function to reset detection ignore 959 */ 960 961 static void wbsd_reset_ignore(unsigned long data) 962 { 963 struct wbsd_host *host = (struct wbsd_host *)data; 964 965 BUG_ON(host == NULL); 966 967 DBG("Resetting card detection ignore\n"); 968 969 spin_lock_bh(&host->lock); 970 971 host->flags &= ~WBSD_FIGNORE_DETECT; 972 973 /* 974 * Card status might have changed during the 975 * blackout. 976 */ 977 tasklet_schedule(&host->card_tasklet); 978 979 spin_unlock_bh(&host->lock); 980 } 981 982 /* 983 * Tasklets 984 */ 985 986 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host) 987 { 988 WARN_ON(!host->mrq); 989 if (!host->mrq) 990 return NULL; 991 992 WARN_ON(!host->mrq->cmd); 993 if (!host->mrq->cmd) 994 return NULL; 995 996 WARN_ON(!host->mrq->cmd->data); 997 if (!host->mrq->cmd->data) 998 return NULL; 999 1000 return host->mrq->cmd->data; 1001 } 1002 1003 static void wbsd_tasklet_card(unsigned long param) 1004 { 1005 struct wbsd_host *host = (struct wbsd_host *)param; 1006 u8 csr; 1007 int delay = -1; 1008 1009 spin_lock(&host->lock); 1010 1011 if (host->flags & WBSD_FIGNORE_DETECT) { 1012 spin_unlock(&host->lock); 1013 return; 1014 } 1015 1016 csr = inb(host->base + WBSD_CSR); 1017 WARN_ON(csr == 0xff); 1018 1019 if (csr & WBSD_CARDPRESENT) { 1020 if (!(host->flags & WBSD_FCARD_PRESENT)) { 1021 DBG("Card inserted\n"); 1022 host->flags |= WBSD_FCARD_PRESENT; 1023 1024 delay = 500; 1025 } 1026 } else if (host->flags & WBSD_FCARD_PRESENT) { 1027 DBG("Card removed\n"); 1028 host->flags &= ~WBSD_FCARD_PRESENT; 1029 1030 if (host->mrq) { 1031 pr_err("%s: Card removed during transfer!\n", 1032 mmc_hostname(host->mmc)); 1033 wbsd_reset(host); 1034 1035 host->mrq->cmd->error = -ENOMEDIUM; 1036 tasklet_schedule(&host->finish_tasklet); 1037 } 1038 1039 delay = 0; 1040 } 1041 1042 /* 1043 * Unlock first since we might get a call back. 1044 */ 1045 1046 spin_unlock(&host->lock); 1047 1048 if (delay != -1) 1049 mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); 1050 } 1051 1052 static void wbsd_tasklet_fifo(unsigned long param) 1053 { 1054 struct wbsd_host *host = (struct wbsd_host *)param; 1055 struct mmc_data *data; 1056 1057 spin_lock(&host->lock); 1058 1059 if (!host->mrq) 1060 goto end; 1061 1062 data = wbsd_get_data(host); 1063 if (!data) 1064 goto end; 1065 1066 if (data->flags & MMC_DATA_WRITE) 1067 wbsd_fill_fifo(host); 1068 else 1069 wbsd_empty_fifo(host); 1070 1071 /* 1072 * Done? 1073 */ 1074 if (host->num_sg == 0) { 1075 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); 1076 tasklet_schedule(&host->finish_tasklet); 1077 } 1078 1079 end: 1080 spin_unlock(&host->lock); 1081 } 1082 1083 static void wbsd_tasklet_crc(unsigned long param) 1084 { 1085 struct wbsd_host *host = (struct wbsd_host *)param; 1086 struct mmc_data *data; 1087 1088 spin_lock(&host->lock); 1089 1090 if (!host->mrq) 1091 goto end; 1092 1093 data = wbsd_get_data(host); 1094 if (!data) 1095 goto end; 1096 1097 DBGF("CRC error\n"); 1098 1099 data->error = -EILSEQ; 1100 1101 tasklet_schedule(&host->finish_tasklet); 1102 1103 end: 1104 spin_unlock(&host->lock); 1105 } 1106 1107 static void wbsd_tasklet_timeout(unsigned long param) 1108 { 1109 struct wbsd_host *host = (struct wbsd_host *)param; 1110 struct mmc_data *data; 1111 1112 spin_lock(&host->lock); 1113 1114 if (!host->mrq) 1115 goto end; 1116 1117 data = wbsd_get_data(host); 1118 if (!data) 1119 goto end; 1120 1121 DBGF("Timeout\n"); 1122 1123 data->error = -ETIMEDOUT; 1124 1125 tasklet_schedule(&host->finish_tasklet); 1126 1127 end: 1128 spin_unlock(&host->lock); 1129 } 1130 1131 static void wbsd_tasklet_finish(unsigned long param) 1132 { 1133 struct wbsd_host *host = (struct wbsd_host *)param; 1134 struct mmc_data *data; 1135 1136 spin_lock(&host->lock); 1137 1138 WARN_ON(!host->mrq); 1139 if (!host->mrq) 1140 goto end; 1141 1142 data = wbsd_get_data(host); 1143 if (!data) 1144 goto end; 1145 1146 wbsd_finish_data(host, data); 1147 1148 end: 1149 spin_unlock(&host->lock); 1150 } 1151 1152 /* 1153 * Interrupt handling 1154 */ 1155 1156 static irqreturn_t wbsd_irq(int irq, void *dev_id) 1157 { 1158 struct wbsd_host *host = dev_id; 1159 int isr; 1160 1161 isr = inb(host->base + WBSD_ISR); 1162 1163 /* 1164 * Was it actually our hardware that caused the interrupt? 1165 */ 1166 if (isr == 0xff || isr == 0x00) 1167 return IRQ_NONE; 1168 1169 host->isr |= isr; 1170 1171 /* 1172 * Schedule tasklets as needed. 1173 */ 1174 if (isr & WBSD_INT_CARD) 1175 tasklet_schedule(&host->card_tasklet); 1176 if (isr & WBSD_INT_FIFO_THRE) 1177 tasklet_schedule(&host->fifo_tasklet); 1178 if (isr & WBSD_INT_CRC) 1179 tasklet_hi_schedule(&host->crc_tasklet); 1180 if (isr & WBSD_INT_TIMEOUT) 1181 tasklet_hi_schedule(&host->timeout_tasklet); 1182 if (isr & WBSD_INT_TC) 1183 tasklet_schedule(&host->finish_tasklet); 1184 1185 return IRQ_HANDLED; 1186 } 1187 1188 /*****************************************************************************\ 1189 * * 1190 * Device initialisation and shutdown * 1191 * * 1192 \*****************************************************************************/ 1193 1194 /* 1195 * Allocate/free MMC structure. 1196 */ 1197 1198 static int wbsd_alloc_mmc(struct device *dev) 1199 { 1200 struct mmc_host *mmc; 1201 struct wbsd_host *host; 1202 1203 /* 1204 * Allocate MMC structure. 1205 */ 1206 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); 1207 if (!mmc) 1208 return -ENOMEM; 1209 1210 host = mmc_priv(mmc); 1211 host->mmc = mmc; 1212 1213 host->dma = -1; 1214 1215 /* 1216 * Set host parameters. 1217 */ 1218 mmc->ops = &wbsd_ops; 1219 mmc->f_min = 375000; 1220 mmc->f_max = 24000000; 1221 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 1222 mmc->caps = MMC_CAP_4_BIT_DATA; 1223 1224 spin_lock_init(&host->lock); 1225 1226 /* 1227 * Set up timers 1228 */ 1229 init_timer(&host->ignore_timer); 1230 host->ignore_timer.data = (unsigned long)host; 1231 host->ignore_timer.function = wbsd_reset_ignore; 1232 1233 /* 1234 * Maximum number of segments. Worst case is one sector per segment 1235 * so this will be 64kB/512. 1236 */ 1237 mmc->max_segs = 128; 1238 1239 /* 1240 * Maximum request size. Also limited by 64KiB buffer. 1241 */ 1242 mmc->max_req_size = 65536; 1243 1244 /* 1245 * Maximum segment size. Could be one segment with the maximum number 1246 * of bytes. 1247 */ 1248 mmc->max_seg_size = mmc->max_req_size; 1249 1250 /* 1251 * Maximum block size. We have 12 bits (= 4095) but have to subtract 1252 * space for CRC. So the maximum is 4095 - 4*2 = 4087. 1253 */ 1254 mmc->max_blk_size = 4087; 1255 1256 /* 1257 * Maximum block count. There is no real limit so the maximum 1258 * request size will be the only restriction. 1259 */ 1260 mmc->max_blk_count = mmc->max_req_size; 1261 1262 dev_set_drvdata(dev, mmc); 1263 1264 return 0; 1265 } 1266 1267 static void wbsd_free_mmc(struct device *dev) 1268 { 1269 struct mmc_host *mmc; 1270 struct wbsd_host *host; 1271 1272 mmc = dev_get_drvdata(dev); 1273 if (!mmc) 1274 return; 1275 1276 host = mmc_priv(mmc); 1277 BUG_ON(host == NULL); 1278 1279 del_timer_sync(&host->ignore_timer); 1280 1281 mmc_free_host(mmc); 1282 1283 dev_set_drvdata(dev, NULL); 1284 } 1285 1286 /* 1287 * Scan for known chip id:s 1288 */ 1289 1290 static int wbsd_scan(struct wbsd_host *host) 1291 { 1292 int i, j, k; 1293 int id; 1294 1295 /* 1296 * Iterate through all ports, all codes to 1297 * find hardware that is in our known list. 1298 */ 1299 for (i = 0; i < ARRAY_SIZE(config_ports); i++) { 1300 if (!request_region(config_ports[i], 2, DRIVER_NAME)) 1301 continue; 1302 1303 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) { 1304 id = 0xFFFF; 1305 1306 host->config = config_ports[i]; 1307 host->unlock_code = unlock_codes[j]; 1308 1309 wbsd_unlock_config(host); 1310 1311 outb(WBSD_CONF_ID_HI, config_ports[i]); 1312 id = inb(config_ports[i] + 1) << 8; 1313 1314 outb(WBSD_CONF_ID_LO, config_ports[i]); 1315 id |= inb(config_ports[i] + 1); 1316 1317 wbsd_lock_config(host); 1318 1319 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) { 1320 if (id == valid_ids[k]) { 1321 host->chip_id = id; 1322 1323 return 0; 1324 } 1325 } 1326 1327 if (id != 0xFFFF) { 1328 DBG("Unknown hardware (id %x) found at %x\n", 1329 id, config_ports[i]); 1330 } 1331 } 1332 1333 release_region(config_ports[i], 2); 1334 } 1335 1336 host->config = 0; 1337 host->unlock_code = 0; 1338 1339 return -ENODEV; 1340 } 1341 1342 /* 1343 * Allocate/free io port ranges 1344 */ 1345 1346 static int wbsd_request_region(struct wbsd_host *host, int base) 1347 { 1348 if (base & 0x7) 1349 return -EINVAL; 1350 1351 if (!request_region(base, 8, DRIVER_NAME)) 1352 return -EIO; 1353 1354 host->base = base; 1355 1356 return 0; 1357 } 1358 1359 static void wbsd_release_regions(struct wbsd_host *host) 1360 { 1361 if (host->base) 1362 release_region(host->base, 8); 1363 1364 host->base = 0; 1365 1366 if (host->config) 1367 release_region(host->config, 2); 1368 1369 host->config = 0; 1370 } 1371 1372 /* 1373 * Allocate/free DMA port and buffer 1374 */ 1375 1376 static void wbsd_request_dma(struct wbsd_host *host, int dma) 1377 { 1378 if (dma < 0) 1379 return; 1380 1381 if (request_dma(dma, DRIVER_NAME)) 1382 goto err; 1383 1384 /* 1385 * We need to allocate a special buffer in 1386 * order for ISA to be able to DMA to it. 1387 */ 1388 host->dma_buffer = kmalloc(WBSD_DMA_SIZE, 1389 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN); 1390 if (!host->dma_buffer) 1391 goto free; 1392 1393 /* 1394 * Translate the address to a physical address. 1395 */ 1396 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer, 1397 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1398 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) 1399 goto kfree; 1400 1401 /* 1402 * ISA DMA must be aligned on a 64k basis. 1403 */ 1404 if ((host->dma_addr & 0xffff) != 0) 1405 goto unmap; 1406 /* 1407 * ISA cannot access memory above 16 MB. 1408 */ 1409 else if (host->dma_addr >= 0x1000000) 1410 goto unmap; 1411 1412 host->dma = dma; 1413 1414 return; 1415 1416 unmap: 1417 /* 1418 * If we've gotten here then there is some kind of alignment bug 1419 */ 1420 BUG_ON(1); 1421 1422 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1423 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1424 host->dma_addr = 0; 1425 1426 kfree: 1427 kfree(host->dma_buffer); 1428 host->dma_buffer = NULL; 1429 1430 free: 1431 free_dma(dma); 1432 1433 err: 1434 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n", 1435 dma); 1436 } 1437 1438 static void wbsd_release_dma(struct wbsd_host *host) 1439 { 1440 if (!dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) { 1441 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1442 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1443 } 1444 kfree(host->dma_buffer); 1445 if (host->dma >= 0) 1446 free_dma(host->dma); 1447 1448 host->dma = -1; 1449 host->dma_buffer = NULL; 1450 host->dma_addr = 0; 1451 } 1452 1453 /* 1454 * Allocate/free IRQ. 1455 */ 1456 1457 static int wbsd_request_irq(struct wbsd_host *host, int irq) 1458 { 1459 int ret; 1460 1461 /* 1462 * Set up tasklets. Must be done before requesting interrupt. 1463 */ 1464 tasklet_init(&host->card_tasklet, wbsd_tasklet_card, 1465 (unsigned long)host); 1466 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, 1467 (unsigned long)host); 1468 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, 1469 (unsigned long)host); 1470 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, 1471 (unsigned long)host); 1472 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, 1473 (unsigned long)host); 1474 1475 /* 1476 * Allocate interrupt. 1477 */ 1478 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host); 1479 if (ret) 1480 return ret; 1481 1482 host->irq = irq; 1483 1484 return 0; 1485 } 1486 1487 static void wbsd_release_irq(struct wbsd_host *host) 1488 { 1489 if (!host->irq) 1490 return; 1491 1492 free_irq(host->irq, host); 1493 1494 host->irq = 0; 1495 1496 tasklet_kill(&host->card_tasklet); 1497 tasklet_kill(&host->fifo_tasklet); 1498 tasklet_kill(&host->crc_tasklet); 1499 tasklet_kill(&host->timeout_tasklet); 1500 tasklet_kill(&host->finish_tasklet); 1501 } 1502 1503 /* 1504 * Allocate all resources for the host. 1505 */ 1506 1507 static int wbsd_request_resources(struct wbsd_host *host, 1508 int base, int irq, int dma) 1509 { 1510 int ret; 1511 1512 /* 1513 * Allocate I/O ports. 1514 */ 1515 ret = wbsd_request_region(host, base); 1516 if (ret) 1517 return ret; 1518 1519 /* 1520 * Allocate interrupt. 1521 */ 1522 ret = wbsd_request_irq(host, irq); 1523 if (ret) 1524 return ret; 1525 1526 /* 1527 * Allocate DMA. 1528 */ 1529 wbsd_request_dma(host, dma); 1530 1531 return 0; 1532 } 1533 1534 /* 1535 * Release all resources for the host. 1536 */ 1537 1538 static void wbsd_release_resources(struct wbsd_host *host) 1539 { 1540 wbsd_release_dma(host); 1541 wbsd_release_irq(host); 1542 wbsd_release_regions(host); 1543 } 1544 1545 /* 1546 * Configure the resources the chip should use. 1547 */ 1548 1549 static void wbsd_chip_config(struct wbsd_host *host) 1550 { 1551 wbsd_unlock_config(host); 1552 1553 /* 1554 * Reset the chip. 1555 */ 1556 wbsd_write_config(host, WBSD_CONF_SWRST, 1); 1557 wbsd_write_config(host, WBSD_CONF_SWRST, 0); 1558 1559 /* 1560 * Select SD/MMC function. 1561 */ 1562 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1563 1564 /* 1565 * Set up card detection. 1566 */ 1567 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11); 1568 1569 /* 1570 * Configure chip 1571 */ 1572 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); 1573 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); 1574 1575 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); 1576 1577 if (host->dma >= 0) 1578 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); 1579 1580 /* 1581 * Enable and power up chip. 1582 */ 1583 wbsd_write_config(host, WBSD_CONF_ENABLE, 1); 1584 wbsd_write_config(host, WBSD_CONF_POWER, 0x20); 1585 1586 wbsd_lock_config(host); 1587 } 1588 1589 /* 1590 * Check that configured resources are correct. 1591 */ 1592 1593 static int wbsd_chip_validate(struct wbsd_host *host) 1594 { 1595 int base, irq, dma; 1596 1597 wbsd_unlock_config(host); 1598 1599 /* 1600 * Select SD/MMC function. 1601 */ 1602 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1603 1604 /* 1605 * Read configuration. 1606 */ 1607 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8; 1608 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO); 1609 1610 irq = wbsd_read_config(host, WBSD_CONF_IRQ); 1611 1612 dma = wbsd_read_config(host, WBSD_CONF_DRQ); 1613 1614 wbsd_lock_config(host); 1615 1616 /* 1617 * Validate against given configuration. 1618 */ 1619 if (base != host->base) 1620 return 0; 1621 if (irq != host->irq) 1622 return 0; 1623 if ((dma != host->dma) && (host->dma != -1)) 1624 return 0; 1625 1626 return 1; 1627 } 1628 1629 /* 1630 * Powers down the SD function 1631 */ 1632 1633 static void wbsd_chip_poweroff(struct wbsd_host *host) 1634 { 1635 wbsd_unlock_config(host); 1636 1637 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1638 wbsd_write_config(host, WBSD_CONF_ENABLE, 0); 1639 1640 wbsd_lock_config(host); 1641 } 1642 1643 /*****************************************************************************\ 1644 * * 1645 * Devices setup and shutdown * 1646 * * 1647 \*****************************************************************************/ 1648 1649 static int wbsd_init(struct device *dev, int base, int irq, int dma, 1650 int pnp) 1651 { 1652 struct wbsd_host *host = NULL; 1653 struct mmc_host *mmc = NULL; 1654 int ret; 1655 1656 ret = wbsd_alloc_mmc(dev); 1657 if (ret) 1658 return ret; 1659 1660 mmc = dev_get_drvdata(dev); 1661 host = mmc_priv(mmc); 1662 1663 /* 1664 * Scan for hardware. 1665 */ 1666 ret = wbsd_scan(host); 1667 if (ret) { 1668 if (pnp && (ret == -ENODEV)) { 1669 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may 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_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); 1692 wbsd_chip_config(host); 1693 } 1694 } else 1695 wbsd_chip_config(host); 1696 1697 /* 1698 * Power Management stuff. No idea how this works. 1699 * Not tested. 1700 */ 1701 #ifdef CONFIG_PM 1702 if (host->config) { 1703 wbsd_unlock_config(host); 1704 wbsd_write_config(host, WBSD_CONF_PME, 0xA0); 1705 wbsd_lock_config(host); 1706 } 1707 #endif 1708 /* 1709 * Allow device to initialise itself properly. 1710 */ 1711 mdelay(5); 1712 1713 /* 1714 * Reset the chip into a known state. 1715 */ 1716 wbsd_init_device(host); 1717 1718 mmc_add_host(mmc); 1719 1720 pr_info("%s: W83L51xD", mmc_hostname(mmc)); 1721 if (host->chip_id != 0) 1722 printk(" id %x", (int)host->chip_id); 1723 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq); 1724 if (host->dma >= 0) 1725 printk(" dma %d", (int)host->dma); 1726 else 1727 printk(" FIFO"); 1728 if (pnp) 1729 printk(" PnP"); 1730 printk("\n"); 1731 1732 return 0; 1733 } 1734 1735 static void wbsd_shutdown(struct device *dev, int pnp) 1736 { 1737 struct mmc_host *mmc = dev_get_drvdata(dev); 1738 struct wbsd_host *host; 1739 1740 if (!mmc) 1741 return; 1742 1743 host = mmc_priv(mmc); 1744 1745 mmc_remove_host(mmc); 1746 1747 /* 1748 * Power down the SD/MMC function. 1749 */ 1750 if (!pnp) 1751 wbsd_chip_poweroff(host); 1752 1753 wbsd_release_resources(host); 1754 1755 wbsd_free_mmc(dev); 1756 } 1757 1758 /* 1759 * Non-PnP 1760 */ 1761 1762 static int wbsd_probe(struct platform_device *dev) 1763 { 1764 /* Use the module parameters for resources */ 1765 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0); 1766 } 1767 1768 static int wbsd_remove(struct platform_device *dev) 1769 { 1770 wbsd_shutdown(&dev->dev, 0); 1771 1772 return 0; 1773 } 1774 1775 /* 1776 * PnP 1777 */ 1778 1779 #ifdef CONFIG_PNP 1780 1781 static int 1782 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id) 1783 { 1784 int io, irq, dma; 1785 1786 /* 1787 * Get resources from PnP layer. 1788 */ 1789 io = pnp_port_start(pnpdev, 0); 1790 irq = pnp_irq(pnpdev, 0); 1791 if (pnp_dma_valid(pnpdev, 0)) 1792 dma = pnp_dma(pnpdev, 0); 1793 else 1794 dma = -1; 1795 1796 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma); 1797 1798 return wbsd_init(&pnpdev->dev, io, irq, dma, 1); 1799 } 1800 1801 static void wbsd_pnp_remove(struct pnp_dev *dev) 1802 { 1803 wbsd_shutdown(&dev->dev, 1); 1804 } 1805 1806 #endif /* CONFIG_PNP */ 1807 1808 /* 1809 * Power management 1810 */ 1811 1812 #ifdef CONFIG_PM 1813 1814 static int wbsd_platform_suspend(struct platform_device *dev, 1815 pm_message_t state) 1816 { 1817 struct mmc_host *mmc = platform_get_drvdata(dev); 1818 struct wbsd_host *host; 1819 1820 if (mmc == NULL) 1821 return 0; 1822 1823 DBGF("Suspending...\n"); 1824 1825 host = mmc_priv(mmc); 1826 1827 wbsd_chip_poweroff(host); 1828 return 0; 1829 } 1830 1831 static int wbsd_platform_resume(struct platform_device *dev) 1832 { 1833 struct mmc_host *mmc = platform_get_drvdata(dev); 1834 struct wbsd_host *host; 1835 1836 if (mmc == NULL) 1837 return 0; 1838 1839 DBGF("Resuming...\n"); 1840 1841 host = mmc_priv(mmc); 1842 1843 wbsd_chip_config(host); 1844 1845 /* 1846 * Allow device to initialise itself properly. 1847 */ 1848 mdelay(5); 1849 1850 wbsd_init_device(host); 1851 return 0; 1852 } 1853 1854 #ifdef CONFIG_PNP 1855 1856 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state) 1857 { 1858 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1859 1860 if (mmc == NULL) 1861 return 0; 1862 1863 DBGF("Suspending...\n"); 1864 return 0; 1865 } 1866 1867 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev) 1868 { 1869 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1870 struct wbsd_host *host; 1871 1872 if (mmc == NULL) 1873 return 0; 1874 1875 DBGF("Resuming...\n"); 1876 1877 host = mmc_priv(mmc); 1878 1879 /* 1880 * See if chip needs to be configured. 1881 */ 1882 if (host->config != 0) { 1883 if (!wbsd_chip_validate(host)) { 1884 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); 1885 wbsd_chip_config(host); 1886 } 1887 } 1888 1889 /* 1890 * Allow device to initialise itself properly. 1891 */ 1892 mdelay(5); 1893 1894 wbsd_init_device(host); 1895 return 0; 1896 } 1897 1898 #endif /* CONFIG_PNP */ 1899 1900 #else /* CONFIG_PM */ 1901 1902 #define wbsd_platform_suspend NULL 1903 #define wbsd_platform_resume NULL 1904 1905 #define wbsd_pnp_suspend NULL 1906 #define wbsd_pnp_resume NULL 1907 1908 #endif /* CONFIG_PM */ 1909 1910 static struct platform_device *wbsd_device; 1911 1912 static struct platform_driver wbsd_driver = { 1913 .probe = wbsd_probe, 1914 .remove = wbsd_remove, 1915 1916 .suspend = wbsd_platform_suspend, 1917 .resume = wbsd_platform_resume, 1918 .driver = { 1919 .name = DRIVER_NAME, 1920 }, 1921 }; 1922 1923 #ifdef CONFIG_PNP 1924 1925 static struct pnp_driver wbsd_pnp_driver = { 1926 .name = DRIVER_NAME, 1927 .id_table = pnp_dev_table, 1928 .probe = wbsd_pnp_probe, 1929 .remove = wbsd_pnp_remove, 1930 1931 .suspend = wbsd_pnp_suspend, 1932 .resume = wbsd_pnp_resume, 1933 }; 1934 1935 #endif /* CONFIG_PNP */ 1936 1937 /* 1938 * Module loading/unloading 1939 */ 1940 1941 static int __init wbsd_drv_init(void) 1942 { 1943 int result; 1944 1945 pr_info(DRIVER_NAME 1946 ": Winbond W83L51xD SD/MMC card interface driver\n"); 1947 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 1948 1949 #ifdef CONFIG_PNP 1950 1951 if (!param_nopnp) { 1952 result = pnp_register_driver(&wbsd_pnp_driver); 1953 if (result < 0) 1954 return result; 1955 } 1956 #endif /* CONFIG_PNP */ 1957 1958 if (param_nopnp) { 1959 result = platform_driver_register(&wbsd_driver); 1960 if (result < 0) 1961 return result; 1962 1963 wbsd_device = platform_device_alloc(DRIVER_NAME, -1); 1964 if (!wbsd_device) { 1965 platform_driver_unregister(&wbsd_driver); 1966 return -ENOMEM; 1967 } 1968 1969 result = platform_device_add(wbsd_device); 1970 if (result) { 1971 platform_device_put(wbsd_device); 1972 platform_driver_unregister(&wbsd_driver); 1973 return result; 1974 } 1975 } 1976 1977 return 0; 1978 } 1979 1980 static void __exit wbsd_drv_exit(void) 1981 { 1982 #ifdef CONFIG_PNP 1983 1984 if (!param_nopnp) 1985 pnp_unregister_driver(&wbsd_pnp_driver); 1986 1987 #endif /* CONFIG_PNP */ 1988 1989 if (param_nopnp) { 1990 platform_device_unregister(wbsd_device); 1991 1992 platform_driver_unregister(&wbsd_driver); 1993 } 1994 1995 DBG("unloaded\n"); 1996 } 1997 1998 module_init(wbsd_drv_init); 1999 module_exit(wbsd_drv_exit); 2000 #ifdef CONFIG_PNP 2001 module_param_named(nopnp, param_nopnp, uint, 0444); 2002 #endif 2003 module_param_named(io, param_io, uint, 0444); 2004 module_param_named(irq, param_irq, uint, 0444); 2005 module_param_named(dma, param_dma, int, 0444); 2006 2007 MODULE_LICENSE("GPL"); 2008 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 2009 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); 2010 2011 #ifdef CONFIG_PNP 2012 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)"); 2013 #endif 2014 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); 2015 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); 2016 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)"); 2017