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