1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver 4 * 5 * Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved. 6 * 7 * Warning! 8 * 9 * Changes to the FIFO system should be done with extreme care since 10 * the hardware is full of bugs related to the FIFO. Known issues are: 11 * 12 * - FIFO size field in FSR is always zero. 13 * 14 * - FIFO interrupts tend not to work as they should. Interrupts are 15 * triggered only for full/empty events, not for threshold values. 16 * 17 * - On APIC systems the FIFO empty interrupt is sometimes lost. 18 */ 19 20#include <linux/module.h> 21#include <linux/moduleparam.h> 22#include <linux/init.h> 23#include <linux/ioport.h> 24#include <linux/platform_device.h> 25#include <linux/interrupt.h> 26#include <linux/dma-mapping.h> 27#include <linux/delay.h> 28#include <linux/pnp.h> 29#include <linux/highmem.h> 30#include <linux/mmc/host.h> 31#include <linux/mmc/mmc.h> 32#include <linux/mmc/sd.h> 33#include <linux/scatterlist.h> 34#include <linux/slab.h> 35 36#include <asm/io.h> 37#include <asm/dma.h> 38 39#include "wbsd.h" 40 41#define DRIVER_NAME "wbsd" 42 43#define DBG(x...) \ 44 pr_debug(DRIVER_NAME ": " x) 45#define DBGF(f, x...) \ 46 pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x) 47 48/* 49 * Device resources 50 */ 51 52#ifdef CONFIG_PNP 53 54static const struct pnp_device_id pnp_dev_table[] = { 55 { "WEC0517", 0 }, 56 { "WEC0518", 0 }, 57 { "", 0 }, 58}; 59 60MODULE_DEVICE_TABLE(pnp, pnp_dev_table); 61 62#endif /* CONFIG_PNP */ 63 64static const int config_ports[] = { 0x2E, 0x4E }; 65static const int unlock_codes[] = { 0x83, 0x87 }; 66 67static const int valid_ids[] = { 68 0x7112, 69}; 70 71#ifdef CONFIG_PNP 72static unsigned int param_nopnp = 0; 73#else 74static const unsigned int param_nopnp = 1; 75#endif 76static unsigned int param_io = 0x248; 77static unsigned int param_irq = 6; 78static int param_dma = 2; 79 80/* 81 * Basic functions 82 */ 83 84static inline void wbsd_unlock_config(struct wbsd_host *host) 85{ 86 BUG_ON(host->config == 0); 87 88 outb(host->unlock_code, host->config); 89 outb(host->unlock_code, host->config); 90} 91 92static inline void wbsd_lock_config(struct wbsd_host *host) 93{ 94 BUG_ON(host->config == 0); 95 96 outb(LOCK_CODE, host->config); 97} 98 99static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value) 100{ 101 BUG_ON(host->config == 0); 102 103 outb(reg, host->config); 104 outb(value, host->config + 1); 105} 106 107static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg) 108{ 109 BUG_ON(host->config == 0); 110 111 outb(reg, host->config); 112 return inb(host->config + 1); 113} 114 115static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value) 116{ 117 outb(index, host->base + WBSD_IDXR); 118 outb(value, host->base + WBSD_DATAR); 119} 120 121static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index) 122{ 123 outb(index, host->base + WBSD_IDXR); 124 return inb(host->base + WBSD_DATAR); 125} 126 127/* 128 * Common routines 129 */ 130 131static void wbsd_init_device(struct wbsd_host *host) 132{ 133 u8 setup, ier; 134 135 /* 136 * Reset chip (SD/MMC part) and fifo. 137 */ 138 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 139 setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET; 140 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 141 142 /* 143 * Set DAT3 to input 144 */ 145 setup &= ~WBSD_DAT3_H; 146 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 147 host->flags &= ~WBSD_FIGNORE_DETECT; 148 149 /* 150 * Read back default clock. 151 */ 152 host->clk = wbsd_read_index(host, WBSD_IDX_CLK); 153 154 /* 155 * Power down port. 156 */ 157 outb(WBSD_POWER_N, host->base + WBSD_CSR); 158 159 /* 160 * Set maximum timeout. 161 */ 162 wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F); 163 164 /* 165 * Test for card presence 166 */ 167 if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT) 168 host->flags |= WBSD_FCARD_PRESENT; 169 else 170 host->flags &= ~WBSD_FCARD_PRESENT; 171 172 /* 173 * Enable interesting interrupts. 174 */ 175 ier = 0; 176 ier |= WBSD_EINT_CARD; 177 ier |= WBSD_EINT_FIFO_THRE; 178 ier |= WBSD_EINT_CRC; 179 ier |= WBSD_EINT_TIMEOUT; 180 ier |= WBSD_EINT_TC; 181 182 outb(ier, host->base + WBSD_EIR); 183 184 /* 185 * Clear interrupts. 186 */ 187 inb(host->base + WBSD_ISR); 188} 189 190static void wbsd_reset(struct wbsd_host *host) 191{ 192 u8 setup; 193 194 pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc)); 195 196 /* 197 * Soft reset of chip (SD/MMC part). 198 */ 199 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 200 setup |= WBSD_SOFT_RESET; 201 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 202} 203 204static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq) 205{ 206 unsigned long dmaflags; 207 208 if (host->dma >= 0) { 209 /* 210 * Release ISA DMA controller. 211 */ 212 dmaflags = claim_dma_lock(); 213 disable_dma(host->dma); 214 clear_dma_ff(host->dma); 215 release_dma_lock(dmaflags); 216 217 /* 218 * Disable DMA on host. 219 */ 220 wbsd_write_index(host, WBSD_IDX_DMA, 0); 221 } 222 223 host->mrq = NULL; 224 225 /* 226 * MMC layer might call back into the driver so first unlock. 227 */ 228 spin_unlock(&host->lock); 229 mmc_request_done(host->mmc, mrq); 230 spin_lock(&host->lock); 231} 232 233/* 234 * Scatter/gather functions 235 */ 236 237static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data) 238{ 239 /* 240 * Get info. about SG list from data structure. 241 */ 242 host->cur_sg = data->sg; 243 host->num_sg = data->sg_len; 244 245 host->offset = 0; 246 host->remain = host->cur_sg->length; 247} 248 249static inline int wbsd_next_sg(struct wbsd_host *host) 250{ 251 /* 252 * Skip to next SG entry. 253 */ 254 host->cur_sg++; 255 host->num_sg--; 256 257 /* 258 * Any entries left? 259 */ 260 if (host->num_sg > 0) { 261 host->offset = 0; 262 host->remain = host->cur_sg->length; 263 } 264 265 return host->num_sg; 266} 267 268static inline char *wbsd_map_sg(struct wbsd_host *host) 269{ 270 return kmap_local_page(sg_page(host->cur_sg)) + host->cur_sg->offset; 271} 272 273static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data) 274{ 275 size_t len = 0; 276 int i; 277 278 for (i = 0; i < data->sg_len; i++) 279 len += data->sg[i].length; 280 sg_copy_to_buffer(data->sg, data->sg_len, host->dma_buffer, len); 281} 282 283static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data) 284{ 285 size_t len = 0; 286 int i; 287 288 for (i = 0; i < data->sg_len; i++) 289 len += data->sg[i].length; 290 sg_copy_from_buffer(data->sg, data->sg_len, host->dma_buffer, len); 291} 292 293/* 294 * Command handling 295 */ 296 297static inline void wbsd_get_short_reply(struct wbsd_host *host, 298 struct mmc_command *cmd) 299{ 300 /* 301 * Correct response type? 302 */ 303 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) { 304 cmd->error = -EILSEQ; 305 return; 306 } 307 308 cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24; 309 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16; 310 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8; 311 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0; 312 cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24; 313} 314 315static inline void wbsd_get_long_reply(struct wbsd_host *host, 316 struct mmc_command *cmd) 317{ 318 int i; 319 320 /* 321 * Correct response type? 322 */ 323 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) { 324 cmd->error = -EILSEQ; 325 return; 326 } 327 328 for (i = 0; i < 4; i++) { 329 cmd->resp[i] = 330 wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24; 331 cmd->resp[i] |= 332 wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16; 333 cmd->resp[i] |= 334 wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8; 335 cmd->resp[i] |= 336 wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0; 337 } 338} 339 340static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd) 341{ 342 int i; 343 u8 status, isr; 344 345 /* 346 * Clear accumulated ISR. The interrupt routine 347 * will fill this one with events that occur during 348 * transfer. 349 */ 350 host->isr = 0; 351 352 /* 353 * Send the command (CRC calculated by host). 354 */ 355 outb(cmd->opcode, host->base + WBSD_CMDR); 356 for (i = 3; i >= 0; i--) 357 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR); 358 359 cmd->error = 0; 360 361 /* 362 * Wait for the request to complete. 363 */ 364 do { 365 status = wbsd_read_index(host, WBSD_IDX_STATUS); 366 } while (status & WBSD_CARDTRAFFIC); 367 368 /* 369 * Do we expect a reply? 370 */ 371 if (cmd->flags & MMC_RSP_PRESENT) { 372 /* 373 * Read back status. 374 */ 375 isr = host->isr; 376 377 /* Card removed? */ 378 if (isr & WBSD_INT_CARD) 379 cmd->error = -ENOMEDIUM; 380 /* Timeout? */ 381 else if (isr & WBSD_INT_TIMEOUT) 382 cmd->error = -ETIMEDOUT; 383 /* CRC? */ 384 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC)) 385 cmd->error = -EILSEQ; 386 /* All ok */ 387 else { 388 if (cmd->flags & MMC_RSP_136) 389 wbsd_get_long_reply(host, cmd); 390 else 391 wbsd_get_short_reply(host, cmd); 392 } 393 } 394} 395 396/* 397 * Data functions 398 */ 399 400static void wbsd_empty_fifo(struct wbsd_host *host) 401{ 402 struct mmc_data *data = host->mrq->cmd->data; 403 char *buffer; 404 int i, idx, fsr, fifo; 405 406 /* 407 * Handle excessive data. 408 */ 409 if (host->num_sg == 0) 410 return; 411 412 buffer = wbsd_map_sg(host) + host->offset; 413 idx = 0; 414 415 /* 416 * Drain the fifo. This has a tendency to loop longer 417 * than the FIFO length (usually one block). 418 */ 419 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) { 420 /* 421 * The size field in the FSR is broken so we have to 422 * do some guessing. 423 */ 424 if (fsr & WBSD_FIFO_FULL) 425 fifo = 16; 426 else if (fsr & WBSD_FIFO_FUTHRE) 427 fifo = 8; 428 else 429 fifo = 1; 430 431 for (i = 0; i < fifo; i++) { 432 buffer[idx++] = inb(host->base + WBSD_DFR); 433 host->offset++; 434 host->remain--; 435 436 data->bytes_xfered++; 437 438 /* 439 * End of scatter list entry? 440 */ 441 if (host->remain == 0) { 442 kunmap_local(buffer); 443 /* 444 * Get next entry. Check if last. 445 */ 446 if (!wbsd_next_sg(host)) 447 return; 448 449 buffer = wbsd_map_sg(host); 450 idx = 0; 451 } 452 } 453 } 454 kunmap_local(buffer); 455 456 /* 457 * This is a very dirty hack to solve a 458 * hardware problem. The chip doesn't trigger 459 * FIFO threshold interrupts properly. 460 */ 461 if ((data->blocks * data->blksz - data->bytes_xfered) < 16) 462 tasklet_schedule(&host->fifo_tasklet); 463} 464 465static void wbsd_fill_fifo(struct wbsd_host *host) 466{ 467 struct mmc_data *data = host->mrq->cmd->data; 468 char *buffer; 469 int i, idx, fsr, fifo; 470 471 /* 472 * Check that we aren't being called after the 473 * entire buffer has been transferred. 474 */ 475 if (host->num_sg == 0) 476 return; 477 478 buffer = wbsd_map_sg(host) + host->offset; 479 idx = 0; 480 481 /* 482 * Fill the fifo. This has a tendency to loop longer 483 * than the FIFO length (usually one block). 484 */ 485 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) { 486 /* 487 * The size field in the FSR is broken so we have to 488 * do some guessing. 489 */ 490 if (fsr & WBSD_FIFO_EMPTY) 491 fifo = 0; 492 else if (fsr & WBSD_FIFO_EMTHRE) 493 fifo = 8; 494 else 495 fifo = 15; 496 497 for (i = 16; i > fifo; i--) { 498 outb(buffer[idx], host->base + WBSD_DFR); 499 host->offset++; 500 host->remain--; 501 502 data->bytes_xfered++; 503 504 /* 505 * End of scatter list entry? 506 */ 507 if (host->remain == 0) { 508 kunmap_local(buffer); 509 /* 510 * Get next entry. Check if last. 511 */ 512 if (!wbsd_next_sg(host)) 513 return; 514 515 buffer = wbsd_map_sg(host); 516 idx = 0; 517 } 518 } 519 } 520 kunmap_local(buffer); 521 522 /* 523 * The controller stops sending interrupts for 524 * 'FIFO empty' under certain conditions. So we 525 * need to be a bit more pro-active. 526 */ 527 tasklet_schedule(&host->fifo_tasklet); 528} 529 530static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data) 531{ 532 u16 blksize; 533 u8 setup; 534 unsigned long dmaflags; 535 unsigned int size; 536 537 /* 538 * Calculate size. 539 */ 540 size = data->blocks * data->blksz; 541 542 /* 543 * Check timeout values for overflow. 544 * (Yes, some cards cause this value to overflow). 545 */ 546 if (data->timeout_ns > 127000000) 547 wbsd_write_index(host, WBSD_IDX_TAAC, 127); 548 else { 549 wbsd_write_index(host, WBSD_IDX_TAAC, 550 data->timeout_ns / 1000000); 551 } 552 553 if (data->timeout_clks > 255) 554 wbsd_write_index(host, WBSD_IDX_NSAC, 255); 555 else 556 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks); 557 558 /* 559 * Inform the chip of how large blocks will be 560 * sent. It needs this to determine when to 561 * calculate CRC. 562 * 563 * Space for CRC must be included in the size. 564 * Two bytes are needed for each data line. 565 */ 566 if (host->bus_width == MMC_BUS_WIDTH_1) { 567 blksize = data->blksz + 2; 568 569 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0); 570 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); 571 } else if (host->bus_width == MMC_BUS_WIDTH_4) { 572 blksize = data->blksz + 2 * 4; 573 574 wbsd_write_index(host, WBSD_IDX_PBSMSB, 575 ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH); 576 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); 577 } else { 578 data->error = -EINVAL; 579 return; 580 } 581 582 /* 583 * Clear the FIFO. This is needed even for DMA 584 * transfers since the chip still uses the FIFO 585 * internally. 586 */ 587 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 588 setup |= WBSD_FIFO_RESET; 589 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 590 591 /* 592 * DMA transfer? 593 */ 594 if (host->dma >= 0) { 595 /* 596 * The buffer for DMA is only 64 kB. 597 */ 598 BUG_ON(size > 0x10000); 599 if (size > 0x10000) { 600 data->error = -EINVAL; 601 return; 602 } 603 604 /* 605 * Transfer data from the SG list to 606 * the DMA buffer. 607 */ 608 if (data->flags & MMC_DATA_WRITE) 609 wbsd_sg_to_dma(host, data); 610 611 /* 612 * Initialise the ISA DMA controller. 613 */ 614 dmaflags = claim_dma_lock(); 615 disable_dma(host->dma); 616 clear_dma_ff(host->dma); 617 if (data->flags & MMC_DATA_READ) 618 set_dma_mode(host->dma, DMA_MODE_READ & ~0x40); 619 else 620 set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40); 621 set_dma_addr(host->dma, host->dma_addr); 622 set_dma_count(host->dma, size); 623 624 enable_dma(host->dma); 625 release_dma_lock(dmaflags); 626 627 /* 628 * Enable DMA on the host. 629 */ 630 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE); 631 } else { 632 /* 633 * This flag is used to keep printk 634 * output to a minimum. 635 */ 636 host->firsterr = 1; 637 638 /* 639 * Initialise the SG list. 640 */ 641 wbsd_init_sg(host, data); 642 643 /* 644 * Turn off DMA. 645 */ 646 wbsd_write_index(host, WBSD_IDX_DMA, 0); 647 648 /* 649 * Set up FIFO threshold levels (and fill 650 * buffer if doing a write). 651 */ 652 if (data->flags & MMC_DATA_READ) { 653 wbsd_write_index(host, WBSD_IDX_FIFOEN, 654 WBSD_FIFOEN_FULL | 8); 655 } else { 656 wbsd_write_index(host, WBSD_IDX_FIFOEN, 657 WBSD_FIFOEN_EMPTY | 8); 658 wbsd_fill_fifo(host); 659 } 660 } 661 662 data->error = 0; 663} 664 665static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data) 666{ 667 unsigned long dmaflags; 668 int count; 669 u8 status; 670 671 WARN_ON(host->mrq == NULL); 672 673 /* 674 * Send a stop command if needed. 675 */ 676 if (data->stop) 677 wbsd_send_command(host, data->stop); 678 679 /* 680 * Wait for the controller to leave data 681 * transfer state. 682 */ 683 do { 684 status = wbsd_read_index(host, WBSD_IDX_STATUS); 685 } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE)); 686 687 /* 688 * DMA transfer? 689 */ 690 if (host->dma >= 0) { 691 /* 692 * Disable DMA on the host. 693 */ 694 wbsd_write_index(host, WBSD_IDX_DMA, 0); 695 696 /* 697 * Turn of ISA DMA controller. 698 */ 699 dmaflags = claim_dma_lock(); 700 disable_dma(host->dma); 701 clear_dma_ff(host->dma); 702 count = get_dma_residue(host->dma); 703 release_dma_lock(dmaflags); 704 705 data->bytes_xfered = host->mrq->data->blocks * 706 host->mrq->data->blksz - count; 707 data->bytes_xfered -= data->bytes_xfered % data->blksz; 708 709 /* 710 * Any leftover data? 711 */ 712 if (count) { 713 pr_err("%s: Incomplete DMA transfer. " 714 "%d bytes left.\n", 715 mmc_hostname(host->mmc), count); 716 717 if (!data->error) 718 data->error = -EIO; 719 } else { 720 /* 721 * Transfer data from DMA buffer to 722 * SG list. 723 */ 724 if (data->flags & MMC_DATA_READ) 725 wbsd_dma_to_sg(host, data); 726 } 727 728 if (data->error) { 729 if (data->bytes_xfered) 730 data->bytes_xfered -= data->blksz; 731 } 732 } 733 734 wbsd_request_end(host, host->mrq); 735} 736 737/*****************************************************************************\ 738 * * 739 * MMC layer callbacks * 740 * * 741\*****************************************************************************/ 742 743static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq) 744{ 745 struct wbsd_host *host = mmc_priv(mmc); 746 struct mmc_command *cmd; 747 748 /* 749 * Disable tasklets to avoid a deadlock. 750 */ 751 spin_lock_bh(&host->lock); 752 753 BUG_ON(host->mrq != NULL); 754 755 cmd = mrq->cmd; 756 757 host->mrq = mrq; 758 759 /* 760 * Check that there is actually a card in the slot. 761 */ 762 if (!(host->flags & WBSD_FCARD_PRESENT)) { 763 cmd->error = -ENOMEDIUM; 764 goto done; 765 } 766 767 if (cmd->data) { 768 /* 769 * The hardware is so delightfully stupid that it has a list 770 * of "data" commands. If a command isn't on this list, it'll 771 * just go back to the idle state and won't send any data 772 * interrupts. 773 */ 774 switch (cmd->opcode) { 775 case SD_SWITCH_VOLTAGE: 776 case MMC_READ_SINGLE_BLOCK: 777 case MMC_READ_MULTIPLE_BLOCK: 778 case MMC_WRITE_DAT_UNTIL_STOP: 779 case MMC_WRITE_BLOCK: 780 case MMC_WRITE_MULTIPLE_BLOCK: 781 case MMC_PROGRAM_CID: 782 case MMC_PROGRAM_CSD: 783 case MMC_SEND_WRITE_PROT: 784 case MMC_LOCK_UNLOCK: 785 case MMC_GEN_CMD: 786 break; 787 788 /* ACMDs. We don't keep track of state, so we just treat them 789 * like any other command. */ 790 case SD_APP_SEND_SCR: 791 break; 792 793 default: 794 pr_warn("%s: Data command %d is not supported by this controller\n", 795 mmc_hostname(host->mmc), cmd->opcode); 796 cmd->error = -EINVAL; 797 798 goto done; 799 } 800 } 801 802 /* 803 * Does the request include data? 804 */ 805 if (cmd->data) { 806 wbsd_prepare_data(host, cmd->data); 807 808 if (cmd->data->error) 809 goto done; 810 } 811 812 wbsd_send_command(host, cmd); 813 814 /* 815 * If this is a data transfer the request 816 * will be finished after the data has 817 * transferred. 818 */ 819 if (cmd->data && !cmd->error) { 820 /* 821 * Dirty fix for hardware bug. 822 */ 823 if (host->dma == -1) 824 tasklet_schedule(&host->fifo_tasklet); 825 826 spin_unlock_bh(&host->lock); 827 828 return; 829 } 830 831done: 832 wbsd_request_end(host, mrq); 833 834 spin_unlock_bh(&host->lock); 835} 836 837static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 838{ 839 struct wbsd_host *host = mmc_priv(mmc); 840 u8 clk, setup, pwr; 841 842 spin_lock_bh(&host->lock); 843 844 /* 845 * Reset the chip on each power off. 846 * Should clear out any weird states. 847 */ 848 if (ios->power_mode == MMC_POWER_OFF) 849 wbsd_init_device(host); 850 851 if (ios->clock >= 24000000) 852 clk = WBSD_CLK_24M; 853 else if (ios->clock >= 16000000) 854 clk = WBSD_CLK_16M; 855 else if (ios->clock >= 12000000) 856 clk = WBSD_CLK_12M; 857 else 858 clk = WBSD_CLK_375K; 859 860 /* 861 * Only write to the clock register when 862 * there is an actual change. 863 */ 864 if (clk != host->clk) { 865 wbsd_write_index(host, WBSD_IDX_CLK, clk); 866 host->clk = clk; 867 } 868 869 /* 870 * Power up card. 871 */ 872 if (ios->power_mode != MMC_POWER_OFF) { 873 pwr = inb(host->base + WBSD_CSR); 874 pwr &= ~WBSD_POWER_N; 875 outb(pwr, host->base + WBSD_CSR); 876 } 877 878 /* 879 * MMC cards need to have pin 1 high during init. 880 * It wreaks havoc with the card detection though so 881 * that needs to be disabled. 882 */ 883 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 884 if (ios->chip_select == MMC_CS_HIGH) { 885 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1); 886 setup |= WBSD_DAT3_H; 887 host->flags |= WBSD_FIGNORE_DETECT; 888 } else { 889 if (setup & WBSD_DAT3_H) { 890 setup &= ~WBSD_DAT3_H; 891 892 /* 893 * We cannot resume card detection immediately 894 * because of capacitance and delays in the chip. 895 */ 896 mod_timer(&host->ignore_timer, jiffies + HZ / 100); 897 } 898 } 899 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 900 901 /* 902 * Store bus width for later. Will be used when 903 * setting up the data transfer. 904 */ 905 host->bus_width = ios->bus_width; 906 907 spin_unlock_bh(&host->lock); 908} 909 910static int wbsd_get_ro(struct mmc_host *mmc) 911{ 912 struct wbsd_host *host = mmc_priv(mmc); 913 u8 csr; 914 915 spin_lock_bh(&host->lock); 916 917 csr = inb(host->base + WBSD_CSR); 918 csr |= WBSD_MSLED; 919 outb(csr, host->base + WBSD_CSR); 920 921 mdelay(1); 922 923 csr = inb(host->base + WBSD_CSR); 924 csr &= ~WBSD_MSLED; 925 outb(csr, host->base + WBSD_CSR); 926 927 spin_unlock_bh(&host->lock); 928 929 return !!(csr & WBSD_WRPT); 930} 931 932static const struct mmc_host_ops wbsd_ops = { 933 .request = wbsd_request, 934 .set_ios = wbsd_set_ios, 935 .get_ro = wbsd_get_ro, 936}; 937 938/*****************************************************************************\ 939 * * 940 * Interrupt handling * 941 * * 942\*****************************************************************************/ 943 944/* 945 * Helper function to reset detection ignore 946 */ 947 948static void wbsd_reset_ignore(struct timer_list *t) 949{ 950 struct wbsd_host *host = from_timer(host, t, ignore_timer); 951 952 BUG_ON(host == NULL); 953 954 DBG("Resetting card detection ignore\n"); 955 956 spin_lock_bh(&host->lock); 957 958 host->flags &= ~WBSD_FIGNORE_DETECT; 959 960 /* 961 * Card status might have changed during the 962 * blackout. 963 */ 964 tasklet_schedule(&host->card_tasklet); 965 966 spin_unlock_bh(&host->lock); 967} 968 969/* 970 * Tasklets 971 */ 972 973static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host) 974{ 975 WARN_ON(!host->mrq); 976 if (!host->mrq) 977 return NULL; 978 979 WARN_ON(!host->mrq->cmd); 980 if (!host->mrq->cmd) 981 return NULL; 982 983 WARN_ON(!host->mrq->cmd->data); 984 if (!host->mrq->cmd->data) 985 return NULL; 986 987 return host->mrq->cmd->data; 988} 989 990static void wbsd_tasklet_card(struct tasklet_struct *t) 991{ 992 struct wbsd_host *host = from_tasklet(host, t, card_tasklet); 993 u8 csr; 994 int delay = -1; 995 996 spin_lock(&host->lock); 997 998 if (host->flags & WBSD_FIGNORE_DETECT) { 999 spin_unlock(&host->lock); 1000 return; 1001 } 1002 1003 csr = inb(host->base + WBSD_CSR); 1004 WARN_ON(csr == 0xff); 1005 1006 if (csr & WBSD_CARDPRESENT) { 1007 if (!(host->flags & WBSD_FCARD_PRESENT)) { 1008 DBG("Card inserted\n"); 1009 host->flags |= WBSD_FCARD_PRESENT; 1010 1011 delay = 500; 1012 } 1013 } else if (host->flags & WBSD_FCARD_PRESENT) { 1014 DBG("Card removed\n"); 1015 host->flags &= ~WBSD_FCARD_PRESENT; 1016 1017 if (host->mrq) { 1018 pr_err("%s: Card removed during transfer!\n", 1019 mmc_hostname(host->mmc)); 1020 wbsd_reset(host); 1021 1022 host->mrq->cmd->error = -ENOMEDIUM; 1023 tasklet_schedule(&host->finish_tasklet); 1024 } 1025 1026 delay = 0; 1027 } 1028 1029 /* 1030 * Unlock first since we might get a call back. 1031 */ 1032 1033 spin_unlock(&host->lock); 1034 1035 if (delay != -1) 1036 mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); 1037} 1038 1039static void wbsd_tasklet_fifo(struct tasklet_struct *t) 1040{ 1041 struct wbsd_host *host = from_tasklet(host, t, fifo_tasklet); 1042 struct mmc_data *data; 1043 1044 spin_lock(&host->lock); 1045 1046 if (!host->mrq) 1047 goto end; 1048 1049 data = wbsd_get_data(host); 1050 if (!data) 1051 goto end; 1052 1053 if (data->flags & MMC_DATA_WRITE) 1054 wbsd_fill_fifo(host); 1055 else 1056 wbsd_empty_fifo(host); 1057 1058 /* 1059 * Done? 1060 */ 1061 if (host->num_sg == 0) { 1062 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); 1063 tasklet_schedule(&host->finish_tasklet); 1064 } 1065 1066end: 1067 spin_unlock(&host->lock); 1068} 1069 1070static void wbsd_tasklet_crc(struct tasklet_struct *t) 1071{ 1072 struct wbsd_host *host = from_tasklet(host, t, crc_tasklet); 1073 struct mmc_data *data; 1074 1075 spin_lock(&host->lock); 1076 1077 if (!host->mrq) 1078 goto end; 1079 1080 data = wbsd_get_data(host); 1081 if (!data) 1082 goto end; 1083 1084 DBGF("CRC error\n"); 1085 1086 data->error = -EILSEQ; 1087 1088 tasklet_schedule(&host->finish_tasklet); 1089 1090end: 1091 spin_unlock(&host->lock); 1092} 1093 1094static void wbsd_tasklet_timeout(struct tasklet_struct *t) 1095{ 1096 struct wbsd_host *host = from_tasklet(host, t, timeout_tasklet); 1097 struct mmc_data *data; 1098 1099 spin_lock(&host->lock); 1100 1101 if (!host->mrq) 1102 goto end; 1103 1104 data = wbsd_get_data(host); 1105 if (!data) 1106 goto end; 1107 1108 DBGF("Timeout\n"); 1109 1110 data->error = -ETIMEDOUT; 1111 1112 tasklet_schedule(&host->finish_tasklet); 1113 1114end: 1115 spin_unlock(&host->lock); 1116} 1117 1118static void wbsd_tasklet_finish(struct tasklet_struct *t) 1119{ 1120 struct wbsd_host *host = from_tasklet(host, t, finish_tasklet); 1121 struct mmc_data *data; 1122 1123 spin_lock(&host->lock); 1124 1125 WARN_ON(!host->mrq); 1126 if (!host->mrq) 1127 goto end; 1128 1129 data = wbsd_get_data(host); 1130 if (!data) 1131 goto end; 1132 1133 wbsd_finish_data(host, data); 1134 1135end: 1136 spin_unlock(&host->lock); 1137} 1138 1139/* 1140 * Interrupt handling 1141 */ 1142 1143static irqreturn_t wbsd_irq(int irq, void *dev_id) 1144{ 1145 struct wbsd_host *host = dev_id; 1146 int isr; 1147 1148 isr = inb(host->base + WBSD_ISR); 1149 1150 /* 1151 * Was it actually our hardware that caused the interrupt? 1152 */ 1153 if (isr == 0xff || isr == 0x00) 1154 return IRQ_NONE; 1155 1156 host->isr |= isr; 1157 1158 /* 1159 * Schedule tasklets as needed. 1160 */ 1161 if (isr & WBSD_INT_CARD) 1162 tasklet_schedule(&host->card_tasklet); 1163 if (isr & WBSD_INT_FIFO_THRE) 1164 tasklet_schedule(&host->fifo_tasklet); 1165 if (isr & WBSD_INT_CRC) 1166 tasklet_hi_schedule(&host->crc_tasklet); 1167 if (isr & WBSD_INT_TIMEOUT) 1168 tasklet_hi_schedule(&host->timeout_tasklet); 1169 if (isr & WBSD_INT_TC) 1170 tasklet_schedule(&host->finish_tasklet); 1171 1172 return IRQ_HANDLED; 1173} 1174 1175/*****************************************************************************\ 1176 * * 1177 * Device initialisation and shutdown * 1178 * * 1179\*****************************************************************************/ 1180 1181/* 1182 * Allocate/free MMC structure. 1183 */ 1184 1185static int wbsd_alloc_mmc(struct device *dev) 1186{ 1187 struct mmc_host *mmc; 1188 struct wbsd_host *host; 1189 1190 /* 1191 * Allocate MMC structure. 1192 */ 1193 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); 1194 if (!mmc) 1195 return -ENOMEM; 1196 1197 host = mmc_priv(mmc); 1198 host->mmc = mmc; 1199 1200 host->dma = -1; 1201 1202 /* 1203 * Set host parameters. 1204 */ 1205 mmc->ops = &wbsd_ops; 1206 mmc->f_min = 375000; 1207 mmc->f_max = 24000000; 1208 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 1209 mmc->caps = MMC_CAP_4_BIT_DATA; 1210 1211 spin_lock_init(&host->lock); 1212 1213 /* 1214 * Set up timers 1215 */ 1216 timer_setup(&host->ignore_timer, wbsd_reset_ignore, 0); 1217 1218 /* 1219 * Maximum number of segments. Worst case is one sector per segment 1220 * so this will be 64kB/512. 1221 */ 1222 mmc->max_segs = 128; 1223 1224 /* 1225 * Maximum request size. Also limited by 64KiB buffer. 1226 */ 1227 mmc->max_req_size = 65536; 1228 1229 /* 1230 * Maximum segment size. Could be one segment with the maximum number 1231 * of bytes. 1232 */ 1233 mmc->max_seg_size = mmc->max_req_size; 1234 1235 /* 1236 * Maximum block size. We have 12 bits (= 4095) but have to subtract 1237 * space for CRC. So the maximum is 4095 - 4*2 = 4087. 1238 */ 1239 mmc->max_blk_size = 4087; 1240 1241 /* 1242 * Maximum block count. There is no real limit so the maximum 1243 * request size will be the only restriction. 1244 */ 1245 mmc->max_blk_count = mmc->max_req_size; 1246 1247 dev_set_drvdata(dev, mmc); 1248 1249 return 0; 1250} 1251 1252static void wbsd_free_mmc(struct device *dev) 1253{ 1254 struct mmc_host *mmc; 1255 struct wbsd_host *host; 1256 1257 mmc = dev_get_drvdata(dev); 1258 if (!mmc) 1259 return; 1260 1261 host = mmc_priv(mmc); 1262 BUG_ON(host == NULL); 1263 1264 del_timer_sync(&host->ignore_timer); 1265 1266 mmc_free_host(mmc); 1267} 1268 1269/* 1270 * Scan for known chip id:s 1271 */ 1272 1273static int wbsd_scan(struct wbsd_host *host) 1274{ 1275 int i, j, k; 1276 int id; 1277 1278 /* 1279 * Iterate through all ports, all codes to 1280 * find hardware that is in our known list. 1281 */ 1282 for (i = 0; i < ARRAY_SIZE(config_ports); i++) { 1283 if (!request_region(config_ports[i], 2, DRIVER_NAME)) 1284 continue; 1285 1286 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) { 1287 host->config = config_ports[i]; 1288 host->unlock_code = unlock_codes[j]; 1289 1290 wbsd_unlock_config(host); 1291 1292 outb(WBSD_CONF_ID_HI, config_ports[i]); 1293 id = inb(config_ports[i] + 1) << 8; 1294 1295 outb(WBSD_CONF_ID_LO, config_ports[i]); 1296 id |= inb(config_ports[i] + 1); 1297 1298 wbsd_lock_config(host); 1299 1300 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) { 1301 if (id == valid_ids[k]) { 1302 host->chip_id = id; 1303 1304 return 0; 1305 } 1306 } 1307 1308 if (id != 0xFFFF) { 1309 DBG("Unknown hardware (id %x) found at %x\n", 1310 id, config_ports[i]); 1311 } 1312 } 1313 1314 release_region(config_ports[i], 2); 1315 } 1316 1317 host->config = 0; 1318 host->unlock_code = 0; 1319 1320 return -ENODEV; 1321} 1322 1323/* 1324 * Allocate/free io port ranges 1325 */ 1326 1327static int wbsd_request_region(struct wbsd_host *host, int base) 1328{ 1329 if (base & 0x7) 1330 return -EINVAL; 1331 1332 if (!request_region(base, 8, DRIVER_NAME)) 1333 return -EIO; 1334 1335 host->base = base; 1336 1337 return 0; 1338} 1339 1340static void wbsd_release_regions(struct wbsd_host *host) 1341{ 1342 if (host->base) 1343 release_region(host->base, 8); 1344 1345 host->base = 0; 1346 1347 if (host->config) 1348 release_region(host->config, 2); 1349 1350 host->config = 0; 1351} 1352 1353/* 1354 * Allocate/free DMA port and buffer 1355 */ 1356 1357static void wbsd_request_dma(struct wbsd_host *host, int dma) 1358{ 1359 if (dma < 0) 1360 return; 1361 1362 if (request_dma(dma, DRIVER_NAME)) 1363 goto err; 1364 1365 /* 1366 * We need to allocate a special buffer in 1367 * order for ISA to be able to DMA to it. 1368 */ 1369 host->dma_buffer = kmalloc(WBSD_DMA_SIZE, 1370 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); 1371 if (!host->dma_buffer) 1372 goto free; 1373 1374 /* 1375 * Translate the address to a physical address. 1376 */ 1377 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer, 1378 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1379 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) 1380 goto kfree; 1381 1382 /* 1383 * ISA DMA must be aligned on a 64k basis. 1384 */ 1385 if ((host->dma_addr & 0xffff) != 0) 1386 goto unmap; 1387 /* 1388 * ISA cannot access memory above 16 MB. 1389 */ 1390 else if (host->dma_addr >= 0x1000000) 1391 goto unmap; 1392 1393 host->dma = dma; 1394 1395 return; 1396 1397unmap: 1398 /* 1399 * If we've gotten here then there is some kind of alignment bug 1400 */ 1401 BUG_ON(1); 1402 1403 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1404 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1405 host->dma_addr = 0; 1406 1407kfree: 1408 kfree(host->dma_buffer); 1409 host->dma_buffer = NULL; 1410 1411free: 1412 free_dma(dma); 1413 1414err: 1415 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n", 1416 dma); 1417} 1418 1419static void wbsd_release_dma(struct wbsd_host *host) 1420{ 1421 /* 1422 * host->dma_addr is valid here iff host->dma_buffer is not NULL. 1423 */ 1424 if (host->dma_buffer) { 1425 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1426 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1427 kfree(host->dma_buffer); 1428 } 1429 if (host->dma >= 0) 1430 free_dma(host->dma); 1431 1432 host->dma = -1; 1433 host->dma_buffer = NULL; 1434 host->dma_addr = 0; 1435} 1436 1437/* 1438 * Allocate/free IRQ. 1439 */ 1440 1441static int wbsd_request_irq(struct wbsd_host *host, int irq) 1442{ 1443 int ret; 1444 1445 /* 1446 * Set up tasklets. Must be done before requesting interrupt. 1447 */ 1448 tasklet_setup(&host->card_tasklet, wbsd_tasklet_card); 1449 tasklet_setup(&host->fifo_tasklet, wbsd_tasklet_fifo); 1450 tasklet_setup(&host->crc_tasklet, wbsd_tasklet_crc); 1451 tasklet_setup(&host->timeout_tasklet, wbsd_tasklet_timeout); 1452 tasklet_setup(&host->finish_tasklet, wbsd_tasklet_finish); 1453 1454 /* 1455 * Allocate interrupt. 1456 */ 1457 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host); 1458 if (ret) 1459 return ret; 1460 1461 host->irq = irq; 1462 1463 return 0; 1464} 1465 1466static void wbsd_release_irq(struct wbsd_host *host) 1467{ 1468 if (!host->irq) 1469 return; 1470 1471 free_irq(host->irq, host); 1472 1473 host->irq = 0; 1474 1475 tasklet_kill(&host->card_tasklet); 1476 tasklet_kill(&host->fifo_tasklet); 1477 tasklet_kill(&host->crc_tasklet); 1478 tasklet_kill(&host->timeout_tasklet); 1479 tasklet_kill(&host->finish_tasklet); 1480} 1481 1482/* 1483 * Allocate all resources for the host. 1484 */ 1485 1486static int wbsd_request_resources(struct wbsd_host *host, 1487 int base, int irq, int dma) 1488{ 1489 int ret; 1490 1491 /* 1492 * Allocate I/O ports. 1493 */ 1494 ret = wbsd_request_region(host, base); 1495 if (ret) 1496 return ret; 1497 1498 /* 1499 * Allocate interrupt. 1500 */ 1501 ret = wbsd_request_irq(host, irq); 1502 if (ret) 1503 return ret; 1504 1505 /* 1506 * Allocate DMA. 1507 */ 1508 wbsd_request_dma(host, dma); 1509 1510 return 0; 1511} 1512 1513/* 1514 * Release all resources for the host. 1515 */ 1516 1517static void wbsd_release_resources(struct wbsd_host *host) 1518{ 1519 wbsd_release_dma(host); 1520 wbsd_release_irq(host); 1521 wbsd_release_regions(host); 1522} 1523 1524/* 1525 * Configure the resources the chip should use. 1526 */ 1527 1528static void wbsd_chip_config(struct wbsd_host *host) 1529{ 1530 wbsd_unlock_config(host); 1531 1532 /* 1533 * Reset the chip. 1534 */ 1535 wbsd_write_config(host, WBSD_CONF_SWRST, 1); 1536 wbsd_write_config(host, WBSD_CONF_SWRST, 0); 1537 1538 /* 1539 * Select SD/MMC function. 1540 */ 1541 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1542 1543 /* 1544 * Set up card detection. 1545 */ 1546 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11); 1547 1548 /* 1549 * Configure chip 1550 */ 1551 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); 1552 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); 1553 1554 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); 1555 1556 if (host->dma >= 0) 1557 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); 1558 1559 /* 1560 * Enable and power up chip. 1561 */ 1562 wbsd_write_config(host, WBSD_CONF_ENABLE, 1); 1563 wbsd_write_config(host, WBSD_CONF_POWER, 0x20); 1564 1565 wbsd_lock_config(host); 1566} 1567 1568/* 1569 * Check that configured resources are correct. 1570 */ 1571 1572static int wbsd_chip_validate(struct wbsd_host *host) 1573{ 1574 int base, irq, dma; 1575 1576 wbsd_unlock_config(host); 1577 1578 /* 1579 * Select SD/MMC function. 1580 */ 1581 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1582 1583 /* 1584 * Read configuration. 1585 */ 1586 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8; 1587 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO); 1588 1589 irq = wbsd_read_config(host, WBSD_CONF_IRQ); 1590 1591 dma = wbsd_read_config(host, WBSD_CONF_DRQ); 1592 1593 wbsd_lock_config(host); 1594 1595 /* 1596 * Validate against given configuration. 1597 */ 1598 if (base != host->base) 1599 return 0; 1600 if (irq != host->irq) 1601 return 0; 1602 if ((dma != host->dma) && (host->dma != -1)) 1603 return 0; 1604 1605 return 1; 1606} 1607 1608/* 1609 * Powers down the SD function 1610 */ 1611 1612static void wbsd_chip_poweroff(struct wbsd_host *host) 1613{ 1614 wbsd_unlock_config(host); 1615 1616 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1617 wbsd_write_config(host, WBSD_CONF_ENABLE, 0); 1618 1619 wbsd_lock_config(host); 1620} 1621 1622/*****************************************************************************\ 1623 * * 1624 * Devices setup and shutdown * 1625 * * 1626\*****************************************************************************/ 1627 1628static int wbsd_init(struct device *dev, int base, int irq, int dma, 1629 int pnp) 1630{ 1631 struct wbsd_host *host = NULL; 1632 struct mmc_host *mmc = NULL; 1633 int ret; 1634 1635 ret = wbsd_alloc_mmc(dev); 1636 if (ret) 1637 return ret; 1638 1639 mmc = dev_get_drvdata(dev); 1640 host = mmc_priv(mmc); 1641 1642 /* 1643 * Scan for hardware. 1644 */ 1645 ret = wbsd_scan(host); 1646 if (ret) { 1647 if (pnp && (ret == -ENODEV)) { 1648 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n"); 1649 } else { 1650 wbsd_free_mmc(dev); 1651 return ret; 1652 } 1653 } 1654 1655 /* 1656 * Request resources. 1657 */ 1658 ret = wbsd_request_resources(host, base, irq, dma); 1659 if (ret) { 1660 wbsd_release_resources(host); 1661 wbsd_free_mmc(dev); 1662 return ret; 1663 } 1664 1665 /* 1666 * See if chip needs to be configured. 1667 */ 1668 if (pnp) { 1669 if ((host->config != 0) && !wbsd_chip_validate(host)) { 1670 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); 1671 wbsd_chip_config(host); 1672 } 1673 } else 1674 wbsd_chip_config(host); 1675 1676 /* 1677 * Power Management stuff. No idea how this works. 1678 * Not tested. 1679 */ 1680#ifdef CONFIG_PM 1681 if (host->config) { 1682 wbsd_unlock_config(host); 1683 wbsd_write_config(host, WBSD_CONF_PME, 0xA0); 1684 wbsd_lock_config(host); 1685 } 1686#endif 1687 /* 1688 * Allow device to initialise itself properly. 1689 */ 1690 mdelay(5); 1691 1692 /* 1693 * Reset the chip into a known state. 1694 */ 1695 wbsd_init_device(host); 1696 1697 ret = mmc_add_host(mmc); 1698 if (ret) { 1699 if (!pnp) 1700 wbsd_chip_poweroff(host); 1701 1702 wbsd_release_resources(host); 1703 wbsd_free_mmc(dev); 1704 return ret; 1705 } 1706 1707 pr_info("%s: W83L51xD", mmc_hostname(mmc)); 1708 if (host->chip_id != 0) 1709 printk(" id %x", (int)host->chip_id); 1710 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq); 1711 if (host->dma >= 0) 1712 printk(" dma %d", (int)host->dma); 1713 else 1714 printk(" FIFO"); 1715 if (pnp) 1716 printk(" PnP"); 1717 printk("\n"); 1718 1719 return 0; 1720} 1721 1722static void wbsd_shutdown(struct device *dev, int pnp) 1723{ 1724 struct mmc_host *mmc = dev_get_drvdata(dev); 1725 struct wbsd_host *host; 1726 1727 if (!mmc) 1728 return; 1729 1730 host = mmc_priv(mmc); 1731 1732 mmc_remove_host(mmc); 1733 1734 /* 1735 * Power down the SD/MMC function. 1736 */ 1737 if (!pnp) 1738 wbsd_chip_poweroff(host); 1739 1740 wbsd_release_resources(host); 1741 1742 wbsd_free_mmc(dev); 1743} 1744 1745/* 1746 * Non-PnP 1747 */ 1748 1749static int wbsd_probe(struct platform_device *dev) 1750{ 1751 /* Use the module parameters for resources */ 1752 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0); 1753} 1754 1755static void wbsd_remove(struct platform_device *dev) 1756{ 1757 wbsd_shutdown(&dev->dev, 0); 1758} 1759 1760/* 1761 * PnP 1762 */ 1763 1764#ifdef CONFIG_PNP 1765 1766static int 1767wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id) 1768{ 1769 int io, irq, dma; 1770 1771 /* 1772 * Get resources from PnP layer. 1773 */ 1774 io = pnp_port_start(pnpdev, 0); 1775 irq = pnp_irq(pnpdev, 0); 1776 if (pnp_dma_valid(pnpdev, 0)) 1777 dma = pnp_dma(pnpdev, 0); 1778 else 1779 dma = -1; 1780 1781 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma); 1782 1783 return wbsd_init(&pnpdev->dev, io, irq, dma, 1); 1784} 1785 1786static void wbsd_pnp_remove(struct pnp_dev *dev) 1787{ 1788 wbsd_shutdown(&dev->dev, 1); 1789} 1790 1791#endif /* CONFIG_PNP */ 1792 1793/* 1794 * Power management 1795 */ 1796 1797#ifdef CONFIG_PM 1798 1799static int wbsd_platform_suspend(struct platform_device *dev, 1800 pm_message_t state) 1801{ 1802 struct mmc_host *mmc = platform_get_drvdata(dev); 1803 struct wbsd_host *host; 1804 1805 if (mmc == NULL) 1806 return 0; 1807 1808 DBGF("Suspending...\n"); 1809 1810 host = mmc_priv(mmc); 1811 1812 wbsd_chip_poweroff(host); 1813 return 0; 1814} 1815 1816static int wbsd_platform_resume(struct platform_device *dev) 1817{ 1818 struct mmc_host *mmc = platform_get_drvdata(dev); 1819 struct wbsd_host *host; 1820 1821 if (mmc == NULL) 1822 return 0; 1823 1824 DBGF("Resuming...\n"); 1825 1826 host = mmc_priv(mmc); 1827 1828 wbsd_chip_config(host); 1829 1830 /* 1831 * Allow device to initialise itself properly. 1832 */ 1833 mdelay(5); 1834 1835 wbsd_init_device(host); 1836 return 0; 1837} 1838 1839#ifdef CONFIG_PNP 1840 1841static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state) 1842{ 1843 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1844 1845 if (mmc == NULL) 1846 return 0; 1847 1848 DBGF("Suspending...\n"); 1849 return 0; 1850} 1851 1852static int wbsd_pnp_resume(struct pnp_dev *pnp_dev) 1853{ 1854 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1855 struct wbsd_host *host; 1856 1857 if (mmc == NULL) 1858 return 0; 1859 1860 DBGF("Resuming...\n"); 1861 1862 host = mmc_priv(mmc); 1863 1864 /* 1865 * See if chip needs to be configured. 1866 */ 1867 if (host->config != 0) { 1868 if (!wbsd_chip_validate(host)) { 1869 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); 1870 wbsd_chip_config(host); 1871 } 1872 } 1873 1874 /* 1875 * Allow device to initialise itself properly. 1876 */ 1877 mdelay(5); 1878 1879 wbsd_init_device(host); 1880 return 0; 1881} 1882 1883#endif /* CONFIG_PNP */ 1884 1885#else /* CONFIG_PM */ 1886 1887#define wbsd_platform_suspend NULL 1888#define wbsd_platform_resume NULL 1889 1890#define wbsd_pnp_suspend NULL 1891#define wbsd_pnp_resume NULL 1892 1893#endif /* CONFIG_PM */ 1894 1895static struct platform_device *wbsd_device; 1896 1897static struct platform_driver wbsd_driver = { 1898 .probe = wbsd_probe, 1899 .remove_new = wbsd_remove, 1900 .suspend = wbsd_platform_suspend, 1901 .resume = wbsd_platform_resume, 1902 .driver = { 1903 .name = DRIVER_NAME, 1904 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1905 }, 1906}; 1907 1908#ifdef CONFIG_PNP 1909 1910static struct pnp_driver wbsd_pnp_driver = { 1911 .name = DRIVER_NAME, 1912 .id_table = pnp_dev_table, 1913 .probe = wbsd_pnp_probe, 1914 .remove = wbsd_pnp_remove, 1915 1916 .suspend = wbsd_pnp_suspend, 1917 .resume = wbsd_pnp_resume, 1918}; 1919 1920#endif /* CONFIG_PNP */ 1921 1922/* 1923 * Module loading/unloading 1924 */ 1925 1926static int __init wbsd_drv_init(void) 1927{ 1928 int result; 1929 1930 pr_info(DRIVER_NAME 1931 ": Winbond W83L51xD SD/MMC card interface driver\n"); 1932 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 1933 1934#ifdef CONFIG_PNP 1935 1936 if (!param_nopnp) { 1937 result = pnp_register_driver(&wbsd_pnp_driver); 1938 if (result < 0) 1939 return result; 1940 } 1941#endif /* CONFIG_PNP */ 1942 1943 if (param_nopnp) { 1944 result = platform_driver_register(&wbsd_driver); 1945 if (result < 0) 1946 return result; 1947 1948 wbsd_device = platform_device_alloc(DRIVER_NAME, -1); 1949 if (!wbsd_device) { 1950 platform_driver_unregister(&wbsd_driver); 1951 return -ENOMEM; 1952 } 1953 1954 result = platform_device_add(wbsd_device); 1955 if (result) { 1956 platform_device_put(wbsd_device); 1957 platform_driver_unregister(&wbsd_driver); 1958 return result; 1959 } 1960 } 1961 1962 return 0; 1963} 1964 1965static void __exit wbsd_drv_exit(void) 1966{ 1967#ifdef CONFIG_PNP 1968 1969 if (!param_nopnp) 1970 pnp_unregister_driver(&wbsd_pnp_driver); 1971 1972#endif /* CONFIG_PNP */ 1973 1974 if (param_nopnp) { 1975 platform_device_unregister(wbsd_device); 1976 1977 platform_driver_unregister(&wbsd_driver); 1978 } 1979 1980 DBG("unloaded\n"); 1981} 1982 1983module_init(wbsd_drv_init); 1984module_exit(wbsd_drv_exit); 1985#ifdef CONFIG_PNP 1986module_param_hw_named(nopnp, param_nopnp, uint, other, 0444); 1987#endif 1988module_param_hw_named(io, param_io, uint, ioport, 0444); 1989module_param_hw_named(irq, param_irq, uint, irq, 0444); 1990module_param_hw_named(dma, param_dma, int, dma, 0444); 1991 1992MODULE_LICENSE("GPL"); 1993MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 1994MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); 1995 1996#ifdef CONFIG_PNP 1997MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)"); 1998#endif 1999MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); 2000MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); 2001MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)"); 2002