1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver 4 * 5 * Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved. 6 * 7 * Warning! 8 * 9 * Changes to the FIFO system should be done with extreme care since 10 * the hardware is full of bugs related to the FIFO. Known issues are: 11 * 12 * - FIFO size field in FSR is always zero. 13 * 14 * - FIFO interrupts tend not to work as they should. Interrupts are 15 * triggered only for full/empty events, not for threshold values. 16 * 17 * - On APIC systems the FIFO empty interrupt is sometimes lost. 18 */ 19 20 #include <linux/module.h> 21 #include <linux/moduleparam.h> 22 #include <linux/init.h> 23 #include <linux/ioport.h> 24 #include <linux/platform_device.h> 25 #include <linux/interrupt.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/delay.h> 28 #include <linux/pnp.h> 29 #include <linux/highmem.h> 30 #include <linux/mmc/host.h> 31 #include <linux/mmc/mmc.h> 32 #include <linux/mmc/sd.h> 33 #include <linux/scatterlist.h> 34 #include <linux/slab.h> 35 36 #include <asm/io.h> 37 #include <asm/dma.h> 38 39 #include "wbsd.h" 40 41 #define DRIVER_NAME "wbsd" 42 43 #define DBG(x...) \ 44 pr_debug(DRIVER_NAME ": " x) 45 #define DBGF(f, x...) \ 46 pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x) 47 48 /* 49 * Device resources 50 */ 51 52 #ifdef CONFIG_PNP 53 54 static const struct pnp_device_id pnp_dev_table[] = { 55 { "WEC0517", 0 }, 56 { "WEC0518", 0 }, 57 { "", 0 }, 58 }; 59 60 MODULE_DEVICE_TABLE(pnp, pnp_dev_table); 61 62 #endif /* CONFIG_PNP */ 63 64 static const int config_ports[] = { 0x2E, 0x4E }; 65 static const int unlock_codes[] = { 0x83, 0x87 }; 66 67 static const int valid_ids[] = { 68 0x7112, 69 }; 70 71 #ifdef CONFIG_PNP 72 static unsigned int param_nopnp = 0; 73 #else 74 static const unsigned int param_nopnp = 1; 75 #endif 76 static unsigned int param_io = 0x248; 77 static unsigned int param_irq = 6; 78 static int param_dma = 2; 79 80 /* 81 * Basic functions 82 */ 83 84 static inline void wbsd_unlock_config(struct wbsd_host *host) 85 { 86 BUG_ON(host->config == 0); 87 88 outb(host->unlock_code, host->config); 89 outb(host->unlock_code, host->config); 90 } 91 92 static inline void wbsd_lock_config(struct wbsd_host *host) 93 { 94 BUG_ON(host->config == 0); 95 96 outb(LOCK_CODE, host->config); 97 } 98 99 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value) 100 { 101 BUG_ON(host->config == 0); 102 103 outb(reg, host->config); 104 outb(value, host->config + 1); 105 } 106 107 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg) 108 { 109 BUG_ON(host->config == 0); 110 111 outb(reg, host->config); 112 return inb(host->config + 1); 113 } 114 115 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value) 116 { 117 outb(index, host->base + WBSD_IDXR); 118 outb(value, host->base + WBSD_DATAR); 119 } 120 121 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index) 122 { 123 outb(index, host->base + WBSD_IDXR); 124 return inb(host->base + WBSD_DATAR); 125 } 126 127 /* 128 * Common routines 129 */ 130 131 static void wbsd_init_device(struct wbsd_host *host) 132 { 133 u8 setup, ier; 134 135 /* 136 * Reset chip (SD/MMC part) and fifo. 137 */ 138 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 139 setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET; 140 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 141 142 /* 143 * Set DAT3 to input 144 */ 145 setup &= ~WBSD_DAT3_H; 146 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 147 host->flags &= ~WBSD_FIGNORE_DETECT; 148 149 /* 150 * Read back default clock. 151 */ 152 host->clk = wbsd_read_index(host, WBSD_IDX_CLK); 153 154 /* 155 * Power down port. 156 */ 157 outb(WBSD_POWER_N, host->base + WBSD_CSR); 158 159 /* 160 * Set maximum timeout. 161 */ 162 wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F); 163 164 /* 165 * Test for card presence 166 */ 167 if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT) 168 host->flags |= WBSD_FCARD_PRESENT; 169 else 170 host->flags &= ~WBSD_FCARD_PRESENT; 171 172 /* 173 * Enable interesting interrupts. 174 */ 175 ier = 0; 176 ier |= WBSD_EINT_CARD; 177 ier |= WBSD_EINT_FIFO_THRE; 178 ier |= WBSD_EINT_CRC; 179 ier |= WBSD_EINT_TIMEOUT; 180 ier |= WBSD_EINT_TC; 181 182 outb(ier, host->base + WBSD_EIR); 183 184 /* 185 * Clear interrupts. 186 */ 187 inb(host->base + WBSD_ISR); 188 } 189 190 static void wbsd_reset(struct wbsd_host *host) 191 { 192 u8 setup; 193 194 pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc)); 195 196 /* 197 * Soft reset of chip (SD/MMC part). 198 */ 199 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 200 setup |= WBSD_SOFT_RESET; 201 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 202 } 203 204 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq) 205 { 206 unsigned long dmaflags; 207 208 if (host->dma >= 0) { 209 /* 210 * Release ISA DMA controller. 211 */ 212 dmaflags = claim_dma_lock(); 213 disable_dma(host->dma); 214 clear_dma_ff(host->dma); 215 release_dma_lock(dmaflags); 216 217 /* 218 * Disable DMA on host. 219 */ 220 wbsd_write_index(host, WBSD_IDX_DMA, 0); 221 } 222 223 host->mrq = NULL; 224 225 /* 226 * MMC layer might call back into the driver so first unlock. 227 */ 228 spin_unlock(&host->lock); 229 mmc_request_done(host->mmc, mrq); 230 spin_lock(&host->lock); 231 } 232 233 /* 234 * Scatter/gather functions 235 */ 236 237 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data) 238 { 239 /* 240 * Get info. about SG list from data structure. 241 */ 242 host->cur_sg = data->sg; 243 host->num_sg = data->sg_len; 244 245 host->offset = 0; 246 host->remain = host->cur_sg->length; 247 } 248 249 static inline int wbsd_next_sg(struct wbsd_host *host) 250 { 251 /* 252 * Skip to next SG entry. 253 */ 254 host->cur_sg++; 255 host->num_sg--; 256 257 /* 258 * Any entries left? 259 */ 260 if (host->num_sg > 0) { 261 host->offset = 0; 262 host->remain = host->cur_sg->length; 263 } 264 265 return host->num_sg; 266 } 267 268 static inline char *wbsd_map_sg(struct wbsd_host *host) 269 { 270 return kmap_atomic(sg_page(host->cur_sg)) + host->cur_sg->offset; 271 } 272 273 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data) 274 { 275 size_t len = 0; 276 int i; 277 278 for (i = 0; i < data->sg_len; i++) 279 len += data->sg[i].length; 280 sg_copy_to_buffer(data->sg, data->sg_len, host->dma_buffer, len); 281 } 282 283 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data) 284 { 285 size_t len = 0; 286 int i; 287 288 for (i = 0; i < data->sg_len; i++) 289 len += data->sg[i].length; 290 sg_copy_from_buffer(data->sg, data->sg_len, host->dma_buffer, len); 291 } 292 293 /* 294 * Command handling 295 */ 296 297 static inline void wbsd_get_short_reply(struct wbsd_host *host, 298 struct mmc_command *cmd) 299 { 300 /* 301 * Correct response type? 302 */ 303 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) { 304 cmd->error = -EILSEQ; 305 return; 306 } 307 308 cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24; 309 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16; 310 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8; 311 cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0; 312 cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24; 313 } 314 315 static inline void wbsd_get_long_reply(struct wbsd_host *host, 316 struct mmc_command *cmd) 317 { 318 int i; 319 320 /* 321 * Correct response type? 322 */ 323 if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) { 324 cmd->error = -EILSEQ; 325 return; 326 } 327 328 for (i = 0; i < 4; i++) { 329 cmd->resp[i] = 330 wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24; 331 cmd->resp[i] |= 332 wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16; 333 cmd->resp[i] |= 334 wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8; 335 cmd->resp[i] |= 336 wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0; 337 } 338 } 339 340 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd) 341 { 342 int i; 343 u8 status, isr; 344 345 /* 346 * Clear accumulated ISR. The interrupt routine 347 * will fill this one with events that occur during 348 * transfer. 349 */ 350 host->isr = 0; 351 352 /* 353 * Send the command (CRC calculated by host). 354 */ 355 outb(cmd->opcode, host->base + WBSD_CMDR); 356 for (i = 3; i >= 0; i--) 357 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR); 358 359 cmd->error = 0; 360 361 /* 362 * Wait for the request to complete. 363 */ 364 do { 365 status = wbsd_read_index(host, WBSD_IDX_STATUS); 366 } while (status & WBSD_CARDTRAFFIC); 367 368 /* 369 * Do we expect a reply? 370 */ 371 if (cmd->flags & MMC_RSP_PRESENT) { 372 /* 373 * Read back status. 374 */ 375 isr = host->isr; 376 377 /* Card removed? */ 378 if (isr & WBSD_INT_CARD) 379 cmd->error = -ENOMEDIUM; 380 /* Timeout? */ 381 else if (isr & WBSD_INT_TIMEOUT) 382 cmd->error = -ETIMEDOUT; 383 /* CRC? */ 384 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC)) 385 cmd->error = -EILSEQ; 386 /* All ok */ 387 else { 388 if (cmd->flags & MMC_RSP_136) 389 wbsd_get_long_reply(host, cmd); 390 else 391 wbsd_get_short_reply(host, cmd); 392 } 393 } 394 } 395 396 /* 397 * Data functions 398 */ 399 400 static void wbsd_empty_fifo(struct wbsd_host *host) 401 { 402 struct mmc_data *data = host->mrq->cmd->data; 403 char *buffer; 404 int i, idx, fsr, fifo; 405 406 /* 407 * Handle excessive data. 408 */ 409 if (host->num_sg == 0) 410 return; 411 412 buffer = wbsd_map_sg(host) + host->offset; 413 idx = 0; 414 415 /* 416 * Drain the fifo. This has a tendency to loop longer 417 * than the FIFO length (usually one block). 418 */ 419 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) { 420 /* 421 * The size field in the FSR is broken so we have to 422 * do some guessing. 423 */ 424 if (fsr & WBSD_FIFO_FULL) 425 fifo = 16; 426 else if (fsr & WBSD_FIFO_FUTHRE) 427 fifo = 8; 428 else 429 fifo = 1; 430 431 for (i = 0; i < fifo; i++) { 432 buffer[idx++] = inb(host->base + WBSD_DFR); 433 host->offset++; 434 host->remain--; 435 436 data->bytes_xfered++; 437 438 /* 439 * End of scatter list entry? 440 */ 441 if (host->remain == 0) { 442 kunmap_atomic(buffer); 443 /* 444 * Get next entry. Check if last. 445 */ 446 if (!wbsd_next_sg(host)) 447 return; 448 449 buffer = wbsd_map_sg(host); 450 idx = 0; 451 } 452 } 453 } 454 kunmap_atomic(buffer); 455 456 /* 457 * This is a very dirty hack to solve a 458 * hardware problem. The chip doesn't trigger 459 * FIFO threshold interrupts properly. 460 */ 461 if ((data->blocks * data->blksz - data->bytes_xfered) < 16) 462 tasklet_schedule(&host->fifo_tasklet); 463 } 464 465 static void wbsd_fill_fifo(struct wbsd_host *host) 466 { 467 struct mmc_data *data = host->mrq->cmd->data; 468 char *buffer; 469 int i, idx, fsr, fifo; 470 471 /* 472 * Check that we aren't being called after the 473 * entire buffer has been transferred. 474 */ 475 if (host->num_sg == 0) 476 return; 477 478 buffer = wbsd_map_sg(host) + host->offset; 479 idx = 0; 480 481 /* 482 * Fill the fifo. This has a tendency to loop longer 483 * than the FIFO length (usually one block). 484 */ 485 while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) { 486 /* 487 * The size field in the FSR is broken so we have to 488 * do some guessing. 489 */ 490 if (fsr & WBSD_FIFO_EMPTY) 491 fifo = 0; 492 else if (fsr & WBSD_FIFO_EMTHRE) 493 fifo = 8; 494 else 495 fifo = 15; 496 497 for (i = 16; i > fifo; i--) { 498 outb(buffer[idx], host->base + WBSD_DFR); 499 host->offset++; 500 host->remain--; 501 502 data->bytes_xfered++; 503 504 /* 505 * End of scatter list entry? 506 */ 507 if (host->remain == 0) { 508 kunmap_atomic(buffer); 509 /* 510 * Get next entry. Check if last. 511 */ 512 if (!wbsd_next_sg(host)) 513 return; 514 515 buffer = wbsd_map_sg(host); 516 idx = 0; 517 } 518 } 519 } 520 kunmap_atomic(buffer); 521 522 /* 523 * The controller stops sending interrupts for 524 * 'FIFO empty' under certain conditions. So we 525 * need to be a bit more pro-active. 526 */ 527 tasklet_schedule(&host->fifo_tasklet); 528 } 529 530 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data) 531 { 532 u16 blksize; 533 u8 setup; 534 unsigned long dmaflags; 535 unsigned int size; 536 537 /* 538 * Calculate size. 539 */ 540 size = data->blocks * data->blksz; 541 542 /* 543 * Check timeout values for overflow. 544 * (Yes, some cards cause this value to overflow). 545 */ 546 if (data->timeout_ns > 127000000) 547 wbsd_write_index(host, WBSD_IDX_TAAC, 127); 548 else { 549 wbsd_write_index(host, WBSD_IDX_TAAC, 550 data->timeout_ns / 1000000); 551 } 552 553 if (data->timeout_clks > 255) 554 wbsd_write_index(host, WBSD_IDX_NSAC, 255); 555 else 556 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks); 557 558 /* 559 * Inform the chip of how large blocks will be 560 * sent. It needs this to determine when to 561 * calculate CRC. 562 * 563 * Space for CRC must be included in the size. 564 * Two bytes are needed for each data line. 565 */ 566 if (host->bus_width == MMC_BUS_WIDTH_1) { 567 blksize = data->blksz + 2; 568 569 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0); 570 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); 571 } else if (host->bus_width == MMC_BUS_WIDTH_4) { 572 blksize = data->blksz + 2 * 4; 573 574 wbsd_write_index(host, WBSD_IDX_PBSMSB, 575 ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH); 576 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); 577 } else { 578 data->error = -EINVAL; 579 return; 580 } 581 582 /* 583 * Clear the FIFO. This is needed even for DMA 584 * transfers since the chip still uses the FIFO 585 * internally. 586 */ 587 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 588 setup |= WBSD_FIFO_RESET; 589 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 590 591 /* 592 * DMA transfer? 593 */ 594 if (host->dma >= 0) { 595 /* 596 * The buffer for DMA is only 64 kB. 597 */ 598 BUG_ON(size > 0x10000); 599 if (size > 0x10000) { 600 data->error = -EINVAL; 601 return; 602 } 603 604 /* 605 * Transfer data from the SG list to 606 * the DMA buffer. 607 */ 608 if (data->flags & MMC_DATA_WRITE) 609 wbsd_sg_to_dma(host, data); 610 611 /* 612 * Initialise the ISA DMA controller. 613 */ 614 dmaflags = claim_dma_lock(); 615 disable_dma(host->dma); 616 clear_dma_ff(host->dma); 617 if (data->flags & MMC_DATA_READ) 618 set_dma_mode(host->dma, DMA_MODE_READ & ~0x40); 619 else 620 set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40); 621 set_dma_addr(host->dma, host->dma_addr); 622 set_dma_count(host->dma, size); 623 624 enable_dma(host->dma); 625 release_dma_lock(dmaflags); 626 627 /* 628 * Enable DMA on the host. 629 */ 630 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE); 631 } else { 632 /* 633 * This flag is used to keep printk 634 * output to a minimum. 635 */ 636 host->firsterr = 1; 637 638 /* 639 * Initialise the SG list. 640 */ 641 wbsd_init_sg(host, data); 642 643 /* 644 * Turn off DMA. 645 */ 646 wbsd_write_index(host, WBSD_IDX_DMA, 0); 647 648 /* 649 * Set up FIFO threshold levels (and fill 650 * buffer if doing a write). 651 */ 652 if (data->flags & MMC_DATA_READ) { 653 wbsd_write_index(host, WBSD_IDX_FIFOEN, 654 WBSD_FIFOEN_FULL | 8); 655 } else { 656 wbsd_write_index(host, WBSD_IDX_FIFOEN, 657 WBSD_FIFOEN_EMPTY | 8); 658 wbsd_fill_fifo(host); 659 } 660 } 661 662 data->error = 0; 663 } 664 665 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data) 666 { 667 unsigned long dmaflags; 668 int count; 669 u8 status; 670 671 WARN_ON(host->mrq == NULL); 672 673 /* 674 * Send a stop command if needed. 675 */ 676 if (data->stop) 677 wbsd_send_command(host, data->stop); 678 679 /* 680 * Wait for the controller to leave data 681 * transfer state. 682 */ 683 do { 684 status = wbsd_read_index(host, WBSD_IDX_STATUS); 685 } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE)); 686 687 /* 688 * DMA transfer? 689 */ 690 if (host->dma >= 0) { 691 /* 692 * Disable DMA on the host. 693 */ 694 wbsd_write_index(host, WBSD_IDX_DMA, 0); 695 696 /* 697 * Turn of ISA DMA controller. 698 */ 699 dmaflags = claim_dma_lock(); 700 disable_dma(host->dma); 701 clear_dma_ff(host->dma); 702 count = get_dma_residue(host->dma); 703 release_dma_lock(dmaflags); 704 705 data->bytes_xfered = host->mrq->data->blocks * 706 host->mrq->data->blksz - count; 707 data->bytes_xfered -= data->bytes_xfered % data->blksz; 708 709 /* 710 * Any leftover data? 711 */ 712 if (count) { 713 pr_err("%s: Incomplete DMA transfer. " 714 "%d bytes left.\n", 715 mmc_hostname(host->mmc), count); 716 717 if (!data->error) 718 data->error = -EIO; 719 } else { 720 /* 721 * Transfer data from DMA buffer to 722 * SG list. 723 */ 724 if (data->flags & MMC_DATA_READ) 725 wbsd_dma_to_sg(host, data); 726 } 727 728 if (data->error) { 729 if (data->bytes_xfered) 730 data->bytes_xfered -= data->blksz; 731 } 732 } 733 734 wbsd_request_end(host, host->mrq); 735 } 736 737 /*****************************************************************************\ 738 * * 739 * MMC layer callbacks * 740 * * 741 \*****************************************************************************/ 742 743 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq) 744 { 745 struct wbsd_host *host = mmc_priv(mmc); 746 struct mmc_command *cmd; 747 748 /* 749 * Disable tasklets to avoid a deadlock. 750 */ 751 spin_lock_bh(&host->lock); 752 753 BUG_ON(host->mrq != NULL); 754 755 cmd = mrq->cmd; 756 757 host->mrq = mrq; 758 759 /* 760 * Check that there is actually a card in the slot. 761 */ 762 if (!(host->flags & WBSD_FCARD_PRESENT)) { 763 cmd->error = -ENOMEDIUM; 764 goto done; 765 } 766 767 if (cmd->data) { 768 /* 769 * The hardware is so delightfully stupid that it has a list 770 * of "data" commands. If a command isn't on this list, it'll 771 * just go back to the idle state and won't send any data 772 * interrupts. 773 */ 774 switch (cmd->opcode) { 775 case SD_SWITCH_VOLTAGE: 776 case MMC_READ_SINGLE_BLOCK: 777 case MMC_READ_MULTIPLE_BLOCK: 778 case MMC_WRITE_DAT_UNTIL_STOP: 779 case MMC_WRITE_BLOCK: 780 case MMC_WRITE_MULTIPLE_BLOCK: 781 case MMC_PROGRAM_CID: 782 case MMC_PROGRAM_CSD: 783 case MMC_SEND_WRITE_PROT: 784 case MMC_LOCK_UNLOCK: 785 case MMC_GEN_CMD: 786 break; 787 788 /* ACMDs. We don't keep track of state, so we just treat them 789 * like any other command. */ 790 case SD_APP_SEND_SCR: 791 break; 792 793 default: 794 pr_warn("%s: Data command %d is not supported by this controller\n", 795 mmc_hostname(host->mmc), cmd->opcode); 796 cmd->error = -EINVAL; 797 798 goto done; 799 } 800 } 801 802 /* 803 * Does the request include data? 804 */ 805 if (cmd->data) { 806 wbsd_prepare_data(host, cmd->data); 807 808 if (cmd->data->error) 809 goto done; 810 } 811 812 wbsd_send_command(host, cmd); 813 814 /* 815 * If this is a data transfer the request 816 * will be finished after the data has 817 * transferred. 818 */ 819 if (cmd->data && !cmd->error) { 820 /* 821 * Dirty fix for hardware bug. 822 */ 823 if (host->dma == -1) 824 tasklet_schedule(&host->fifo_tasklet); 825 826 spin_unlock_bh(&host->lock); 827 828 return; 829 } 830 831 done: 832 wbsd_request_end(host, mrq); 833 834 spin_unlock_bh(&host->lock); 835 } 836 837 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 838 { 839 struct wbsd_host *host = mmc_priv(mmc); 840 u8 clk, setup, pwr; 841 842 spin_lock_bh(&host->lock); 843 844 /* 845 * Reset the chip on each power off. 846 * Should clear out any weird states. 847 */ 848 if (ios->power_mode == MMC_POWER_OFF) 849 wbsd_init_device(host); 850 851 if (ios->clock >= 24000000) 852 clk = WBSD_CLK_24M; 853 else if (ios->clock >= 16000000) 854 clk = WBSD_CLK_16M; 855 else if (ios->clock >= 12000000) 856 clk = WBSD_CLK_12M; 857 else 858 clk = WBSD_CLK_375K; 859 860 /* 861 * Only write to the clock register when 862 * there is an actual change. 863 */ 864 if (clk != host->clk) { 865 wbsd_write_index(host, WBSD_IDX_CLK, clk); 866 host->clk = clk; 867 } 868 869 /* 870 * Power up card. 871 */ 872 if (ios->power_mode != MMC_POWER_OFF) { 873 pwr = inb(host->base + WBSD_CSR); 874 pwr &= ~WBSD_POWER_N; 875 outb(pwr, host->base + WBSD_CSR); 876 } 877 878 /* 879 * MMC cards need to have pin 1 high during init. 880 * It wreaks havoc with the card detection though so 881 * that needs to be disabled. 882 */ 883 setup = wbsd_read_index(host, WBSD_IDX_SETUP); 884 if (ios->chip_select == MMC_CS_HIGH) { 885 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1); 886 setup |= WBSD_DAT3_H; 887 host->flags |= WBSD_FIGNORE_DETECT; 888 } else { 889 if (setup & WBSD_DAT3_H) { 890 setup &= ~WBSD_DAT3_H; 891 892 /* 893 * We cannot resume card detection immediately 894 * because of capacitance and delays in the chip. 895 */ 896 mod_timer(&host->ignore_timer, jiffies + HZ / 100); 897 } 898 } 899 wbsd_write_index(host, WBSD_IDX_SETUP, setup); 900 901 /* 902 * Store bus width for later. Will be used when 903 * setting up the data transfer. 904 */ 905 host->bus_width = ios->bus_width; 906 907 spin_unlock_bh(&host->lock); 908 } 909 910 static int wbsd_get_ro(struct mmc_host *mmc) 911 { 912 struct wbsd_host *host = mmc_priv(mmc); 913 u8 csr; 914 915 spin_lock_bh(&host->lock); 916 917 csr = inb(host->base + WBSD_CSR); 918 csr |= WBSD_MSLED; 919 outb(csr, host->base + WBSD_CSR); 920 921 mdelay(1); 922 923 csr = inb(host->base + WBSD_CSR); 924 csr &= ~WBSD_MSLED; 925 outb(csr, host->base + WBSD_CSR); 926 927 spin_unlock_bh(&host->lock); 928 929 return !!(csr & WBSD_WRPT); 930 } 931 932 static const struct mmc_host_ops wbsd_ops = { 933 .request = wbsd_request, 934 .set_ios = wbsd_set_ios, 935 .get_ro = wbsd_get_ro, 936 }; 937 938 /*****************************************************************************\ 939 * * 940 * Interrupt handling * 941 * * 942 \*****************************************************************************/ 943 944 /* 945 * Helper function to reset detection ignore 946 */ 947 948 static void wbsd_reset_ignore(struct timer_list *t) 949 { 950 struct wbsd_host *host = from_timer(host, t, ignore_timer); 951 952 BUG_ON(host == NULL); 953 954 DBG("Resetting card detection ignore\n"); 955 956 spin_lock_bh(&host->lock); 957 958 host->flags &= ~WBSD_FIGNORE_DETECT; 959 960 /* 961 * Card status might have changed during the 962 * blackout. 963 */ 964 tasklet_schedule(&host->card_tasklet); 965 966 spin_unlock_bh(&host->lock); 967 } 968 969 /* 970 * Tasklets 971 */ 972 973 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host) 974 { 975 WARN_ON(!host->mrq); 976 if (!host->mrq) 977 return NULL; 978 979 WARN_ON(!host->mrq->cmd); 980 if (!host->mrq->cmd) 981 return NULL; 982 983 WARN_ON(!host->mrq->cmd->data); 984 if (!host->mrq->cmd->data) 985 return NULL; 986 987 return host->mrq->cmd->data; 988 } 989 990 static void wbsd_tasklet_card(unsigned long param) 991 { 992 struct wbsd_host *host = (struct wbsd_host *)param; 993 u8 csr; 994 int delay = -1; 995 996 spin_lock(&host->lock); 997 998 if (host->flags & WBSD_FIGNORE_DETECT) { 999 spin_unlock(&host->lock); 1000 return; 1001 } 1002 1003 csr = inb(host->base + WBSD_CSR); 1004 WARN_ON(csr == 0xff); 1005 1006 if (csr & WBSD_CARDPRESENT) { 1007 if (!(host->flags & WBSD_FCARD_PRESENT)) { 1008 DBG("Card inserted\n"); 1009 host->flags |= WBSD_FCARD_PRESENT; 1010 1011 delay = 500; 1012 } 1013 } else if (host->flags & WBSD_FCARD_PRESENT) { 1014 DBG("Card removed\n"); 1015 host->flags &= ~WBSD_FCARD_PRESENT; 1016 1017 if (host->mrq) { 1018 pr_err("%s: Card removed during transfer!\n", 1019 mmc_hostname(host->mmc)); 1020 wbsd_reset(host); 1021 1022 host->mrq->cmd->error = -ENOMEDIUM; 1023 tasklet_schedule(&host->finish_tasklet); 1024 } 1025 1026 delay = 0; 1027 } 1028 1029 /* 1030 * Unlock first since we might get a call back. 1031 */ 1032 1033 spin_unlock(&host->lock); 1034 1035 if (delay != -1) 1036 mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); 1037 } 1038 1039 static void wbsd_tasklet_fifo(unsigned long param) 1040 { 1041 struct wbsd_host *host = (struct wbsd_host *)param; 1042 struct mmc_data *data; 1043 1044 spin_lock(&host->lock); 1045 1046 if (!host->mrq) 1047 goto end; 1048 1049 data = wbsd_get_data(host); 1050 if (!data) 1051 goto end; 1052 1053 if (data->flags & MMC_DATA_WRITE) 1054 wbsd_fill_fifo(host); 1055 else 1056 wbsd_empty_fifo(host); 1057 1058 /* 1059 * Done? 1060 */ 1061 if (host->num_sg == 0) { 1062 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); 1063 tasklet_schedule(&host->finish_tasklet); 1064 } 1065 1066 end: 1067 spin_unlock(&host->lock); 1068 } 1069 1070 static void wbsd_tasklet_crc(unsigned long param) 1071 { 1072 struct wbsd_host *host = (struct wbsd_host *)param; 1073 struct mmc_data *data; 1074 1075 spin_lock(&host->lock); 1076 1077 if (!host->mrq) 1078 goto end; 1079 1080 data = wbsd_get_data(host); 1081 if (!data) 1082 goto end; 1083 1084 DBGF("CRC error\n"); 1085 1086 data->error = -EILSEQ; 1087 1088 tasklet_schedule(&host->finish_tasklet); 1089 1090 end: 1091 spin_unlock(&host->lock); 1092 } 1093 1094 static void wbsd_tasklet_timeout(unsigned long param) 1095 { 1096 struct wbsd_host *host = (struct wbsd_host *)param; 1097 struct mmc_data *data; 1098 1099 spin_lock(&host->lock); 1100 1101 if (!host->mrq) 1102 goto end; 1103 1104 data = wbsd_get_data(host); 1105 if (!data) 1106 goto end; 1107 1108 DBGF("Timeout\n"); 1109 1110 data->error = -ETIMEDOUT; 1111 1112 tasklet_schedule(&host->finish_tasklet); 1113 1114 end: 1115 spin_unlock(&host->lock); 1116 } 1117 1118 static void wbsd_tasklet_finish(unsigned long param) 1119 { 1120 struct wbsd_host *host = (struct wbsd_host *)param; 1121 struct mmc_data *data; 1122 1123 spin_lock(&host->lock); 1124 1125 WARN_ON(!host->mrq); 1126 if (!host->mrq) 1127 goto end; 1128 1129 data = wbsd_get_data(host); 1130 if (!data) 1131 goto end; 1132 1133 wbsd_finish_data(host, data); 1134 1135 end: 1136 spin_unlock(&host->lock); 1137 } 1138 1139 /* 1140 * Interrupt handling 1141 */ 1142 1143 static irqreturn_t wbsd_irq(int irq, void *dev_id) 1144 { 1145 struct wbsd_host *host = dev_id; 1146 int isr; 1147 1148 isr = inb(host->base + WBSD_ISR); 1149 1150 /* 1151 * Was it actually our hardware that caused the interrupt? 1152 */ 1153 if (isr == 0xff || isr == 0x00) 1154 return IRQ_NONE; 1155 1156 host->isr |= isr; 1157 1158 /* 1159 * Schedule tasklets as needed. 1160 */ 1161 if (isr & WBSD_INT_CARD) 1162 tasklet_schedule(&host->card_tasklet); 1163 if (isr & WBSD_INT_FIFO_THRE) 1164 tasklet_schedule(&host->fifo_tasklet); 1165 if (isr & WBSD_INT_CRC) 1166 tasklet_hi_schedule(&host->crc_tasklet); 1167 if (isr & WBSD_INT_TIMEOUT) 1168 tasklet_hi_schedule(&host->timeout_tasklet); 1169 if (isr & WBSD_INT_TC) 1170 tasklet_schedule(&host->finish_tasklet); 1171 1172 return IRQ_HANDLED; 1173 } 1174 1175 /*****************************************************************************\ 1176 * * 1177 * Device initialisation and shutdown * 1178 * * 1179 \*****************************************************************************/ 1180 1181 /* 1182 * Allocate/free MMC structure. 1183 */ 1184 1185 static int wbsd_alloc_mmc(struct device *dev) 1186 { 1187 struct mmc_host *mmc; 1188 struct wbsd_host *host; 1189 1190 /* 1191 * Allocate MMC structure. 1192 */ 1193 mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); 1194 if (!mmc) 1195 return -ENOMEM; 1196 1197 host = mmc_priv(mmc); 1198 host->mmc = mmc; 1199 1200 host->dma = -1; 1201 1202 /* 1203 * Set host parameters. 1204 */ 1205 mmc->ops = &wbsd_ops; 1206 mmc->f_min = 375000; 1207 mmc->f_max = 24000000; 1208 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 1209 mmc->caps = MMC_CAP_4_BIT_DATA; 1210 1211 spin_lock_init(&host->lock); 1212 1213 /* 1214 * Set up timers 1215 */ 1216 timer_setup(&host->ignore_timer, wbsd_reset_ignore, 0); 1217 1218 /* 1219 * Maximum number of segments. Worst case is one sector per segment 1220 * so this will be 64kB/512. 1221 */ 1222 mmc->max_segs = 128; 1223 1224 /* 1225 * Maximum request size. Also limited by 64KiB buffer. 1226 */ 1227 mmc->max_req_size = 65536; 1228 1229 /* 1230 * Maximum segment size. Could be one segment with the maximum number 1231 * of bytes. 1232 */ 1233 mmc->max_seg_size = mmc->max_req_size; 1234 1235 /* 1236 * Maximum block size. We have 12 bits (= 4095) but have to subtract 1237 * space for CRC. So the maximum is 4095 - 4*2 = 4087. 1238 */ 1239 mmc->max_blk_size = 4087; 1240 1241 /* 1242 * Maximum block count. There is no real limit so the maximum 1243 * request size will be the only restriction. 1244 */ 1245 mmc->max_blk_count = mmc->max_req_size; 1246 1247 dev_set_drvdata(dev, mmc); 1248 1249 return 0; 1250 } 1251 1252 static void wbsd_free_mmc(struct device *dev) 1253 { 1254 struct mmc_host *mmc; 1255 struct wbsd_host *host; 1256 1257 mmc = dev_get_drvdata(dev); 1258 if (!mmc) 1259 return; 1260 1261 host = mmc_priv(mmc); 1262 BUG_ON(host == NULL); 1263 1264 del_timer_sync(&host->ignore_timer); 1265 1266 mmc_free_host(mmc); 1267 1268 dev_set_drvdata(dev, NULL); 1269 } 1270 1271 /* 1272 * Scan for known chip id:s 1273 */ 1274 1275 static int wbsd_scan(struct wbsd_host *host) 1276 { 1277 int i, j, k; 1278 int id; 1279 1280 /* 1281 * Iterate through all ports, all codes to 1282 * find hardware that is in our known list. 1283 */ 1284 for (i = 0; i < ARRAY_SIZE(config_ports); i++) { 1285 if (!request_region(config_ports[i], 2, DRIVER_NAME)) 1286 continue; 1287 1288 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) { 1289 id = 0xFFFF; 1290 1291 host->config = config_ports[i]; 1292 host->unlock_code = unlock_codes[j]; 1293 1294 wbsd_unlock_config(host); 1295 1296 outb(WBSD_CONF_ID_HI, config_ports[i]); 1297 id = inb(config_ports[i] + 1) << 8; 1298 1299 outb(WBSD_CONF_ID_LO, config_ports[i]); 1300 id |= inb(config_ports[i] + 1); 1301 1302 wbsd_lock_config(host); 1303 1304 for (k = 0; k < ARRAY_SIZE(valid_ids); k++) { 1305 if (id == valid_ids[k]) { 1306 host->chip_id = id; 1307 1308 return 0; 1309 } 1310 } 1311 1312 if (id != 0xFFFF) { 1313 DBG("Unknown hardware (id %x) found at %x\n", 1314 id, config_ports[i]); 1315 } 1316 } 1317 1318 release_region(config_ports[i], 2); 1319 } 1320 1321 host->config = 0; 1322 host->unlock_code = 0; 1323 1324 return -ENODEV; 1325 } 1326 1327 /* 1328 * Allocate/free io port ranges 1329 */ 1330 1331 static int wbsd_request_region(struct wbsd_host *host, int base) 1332 { 1333 if (base & 0x7) 1334 return -EINVAL; 1335 1336 if (!request_region(base, 8, DRIVER_NAME)) 1337 return -EIO; 1338 1339 host->base = base; 1340 1341 return 0; 1342 } 1343 1344 static void wbsd_release_regions(struct wbsd_host *host) 1345 { 1346 if (host->base) 1347 release_region(host->base, 8); 1348 1349 host->base = 0; 1350 1351 if (host->config) 1352 release_region(host->config, 2); 1353 1354 host->config = 0; 1355 } 1356 1357 /* 1358 * Allocate/free DMA port and buffer 1359 */ 1360 1361 static void wbsd_request_dma(struct wbsd_host *host, int dma) 1362 { 1363 if (dma < 0) 1364 return; 1365 1366 if (request_dma(dma, DRIVER_NAME)) 1367 goto err; 1368 1369 /* 1370 * We need to allocate a special buffer in 1371 * order for ISA to be able to DMA to it. 1372 */ 1373 host->dma_buffer = kmalloc(WBSD_DMA_SIZE, 1374 GFP_NOIO | GFP_DMA | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); 1375 if (!host->dma_buffer) 1376 goto free; 1377 1378 /* 1379 * Translate the address to a physical address. 1380 */ 1381 host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer, 1382 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1383 if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) 1384 goto kfree; 1385 1386 /* 1387 * ISA DMA must be aligned on a 64k basis. 1388 */ 1389 if ((host->dma_addr & 0xffff) != 0) 1390 goto unmap; 1391 /* 1392 * ISA cannot access memory above 16 MB. 1393 */ 1394 else if (host->dma_addr >= 0x1000000) 1395 goto unmap; 1396 1397 host->dma = dma; 1398 1399 return; 1400 1401 unmap: 1402 /* 1403 * If we've gotten here then there is some kind of alignment bug 1404 */ 1405 BUG_ON(1); 1406 1407 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1408 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1409 host->dma_addr = 0; 1410 1411 kfree: 1412 kfree(host->dma_buffer); 1413 host->dma_buffer = NULL; 1414 1415 free: 1416 free_dma(dma); 1417 1418 err: 1419 pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n", 1420 dma); 1421 } 1422 1423 static void wbsd_release_dma(struct wbsd_host *host) 1424 { 1425 /* 1426 * host->dma_addr is valid here iff host->dma_buffer is not NULL. 1427 */ 1428 if (host->dma_buffer) { 1429 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr, 1430 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL); 1431 kfree(host->dma_buffer); 1432 } 1433 if (host->dma >= 0) 1434 free_dma(host->dma); 1435 1436 host->dma = -1; 1437 host->dma_buffer = NULL; 1438 host->dma_addr = 0; 1439 } 1440 1441 /* 1442 * Allocate/free IRQ. 1443 */ 1444 1445 static int wbsd_request_irq(struct wbsd_host *host, int irq) 1446 { 1447 int ret; 1448 1449 /* 1450 * Set up tasklets. Must be done before requesting interrupt. 1451 */ 1452 tasklet_init(&host->card_tasklet, wbsd_tasklet_card, 1453 (unsigned long)host); 1454 tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, 1455 (unsigned long)host); 1456 tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, 1457 (unsigned long)host); 1458 tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, 1459 (unsigned long)host); 1460 tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, 1461 (unsigned long)host); 1462 1463 /* 1464 * Allocate interrupt. 1465 */ 1466 ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host); 1467 if (ret) 1468 return ret; 1469 1470 host->irq = irq; 1471 1472 return 0; 1473 } 1474 1475 static void wbsd_release_irq(struct wbsd_host *host) 1476 { 1477 if (!host->irq) 1478 return; 1479 1480 free_irq(host->irq, host); 1481 1482 host->irq = 0; 1483 1484 tasklet_kill(&host->card_tasklet); 1485 tasklet_kill(&host->fifo_tasklet); 1486 tasklet_kill(&host->crc_tasklet); 1487 tasklet_kill(&host->timeout_tasklet); 1488 tasklet_kill(&host->finish_tasklet); 1489 } 1490 1491 /* 1492 * Allocate all resources for the host. 1493 */ 1494 1495 static int wbsd_request_resources(struct wbsd_host *host, 1496 int base, int irq, int dma) 1497 { 1498 int ret; 1499 1500 /* 1501 * Allocate I/O ports. 1502 */ 1503 ret = wbsd_request_region(host, base); 1504 if (ret) 1505 return ret; 1506 1507 /* 1508 * Allocate interrupt. 1509 */ 1510 ret = wbsd_request_irq(host, irq); 1511 if (ret) 1512 return ret; 1513 1514 /* 1515 * Allocate DMA. 1516 */ 1517 wbsd_request_dma(host, dma); 1518 1519 return 0; 1520 } 1521 1522 /* 1523 * Release all resources for the host. 1524 */ 1525 1526 static void wbsd_release_resources(struct wbsd_host *host) 1527 { 1528 wbsd_release_dma(host); 1529 wbsd_release_irq(host); 1530 wbsd_release_regions(host); 1531 } 1532 1533 /* 1534 * Configure the resources the chip should use. 1535 */ 1536 1537 static void wbsd_chip_config(struct wbsd_host *host) 1538 { 1539 wbsd_unlock_config(host); 1540 1541 /* 1542 * Reset the chip. 1543 */ 1544 wbsd_write_config(host, WBSD_CONF_SWRST, 1); 1545 wbsd_write_config(host, WBSD_CONF_SWRST, 0); 1546 1547 /* 1548 * Select SD/MMC function. 1549 */ 1550 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1551 1552 /* 1553 * Set up card detection. 1554 */ 1555 wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11); 1556 1557 /* 1558 * Configure chip 1559 */ 1560 wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); 1561 wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); 1562 1563 wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); 1564 1565 if (host->dma >= 0) 1566 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); 1567 1568 /* 1569 * Enable and power up chip. 1570 */ 1571 wbsd_write_config(host, WBSD_CONF_ENABLE, 1); 1572 wbsd_write_config(host, WBSD_CONF_POWER, 0x20); 1573 1574 wbsd_lock_config(host); 1575 } 1576 1577 /* 1578 * Check that configured resources are correct. 1579 */ 1580 1581 static int wbsd_chip_validate(struct wbsd_host *host) 1582 { 1583 int base, irq, dma; 1584 1585 wbsd_unlock_config(host); 1586 1587 /* 1588 * Select SD/MMC function. 1589 */ 1590 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1591 1592 /* 1593 * Read configuration. 1594 */ 1595 base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8; 1596 base |= wbsd_read_config(host, WBSD_CONF_PORT_LO); 1597 1598 irq = wbsd_read_config(host, WBSD_CONF_IRQ); 1599 1600 dma = wbsd_read_config(host, WBSD_CONF_DRQ); 1601 1602 wbsd_lock_config(host); 1603 1604 /* 1605 * Validate against given configuration. 1606 */ 1607 if (base != host->base) 1608 return 0; 1609 if (irq != host->irq) 1610 return 0; 1611 if ((dma != host->dma) && (host->dma != -1)) 1612 return 0; 1613 1614 return 1; 1615 } 1616 1617 /* 1618 * Powers down the SD function 1619 */ 1620 1621 static void wbsd_chip_poweroff(struct wbsd_host *host) 1622 { 1623 wbsd_unlock_config(host); 1624 1625 wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); 1626 wbsd_write_config(host, WBSD_CONF_ENABLE, 0); 1627 1628 wbsd_lock_config(host); 1629 } 1630 1631 /*****************************************************************************\ 1632 * * 1633 * Devices setup and shutdown * 1634 * * 1635 \*****************************************************************************/ 1636 1637 static int wbsd_init(struct device *dev, int base, int irq, int dma, 1638 int pnp) 1639 { 1640 struct wbsd_host *host = NULL; 1641 struct mmc_host *mmc = NULL; 1642 int ret; 1643 1644 ret = wbsd_alloc_mmc(dev); 1645 if (ret) 1646 return ret; 1647 1648 mmc = dev_get_drvdata(dev); 1649 host = mmc_priv(mmc); 1650 1651 /* 1652 * Scan for hardware. 1653 */ 1654 ret = wbsd_scan(host); 1655 if (ret) { 1656 if (pnp && (ret == -ENODEV)) { 1657 pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n"); 1658 } else { 1659 wbsd_free_mmc(dev); 1660 return ret; 1661 } 1662 } 1663 1664 /* 1665 * Request resources. 1666 */ 1667 ret = wbsd_request_resources(host, base, irq, dma); 1668 if (ret) { 1669 wbsd_release_resources(host); 1670 wbsd_free_mmc(dev); 1671 return ret; 1672 } 1673 1674 /* 1675 * See if chip needs to be configured. 1676 */ 1677 if (pnp) { 1678 if ((host->config != 0) && !wbsd_chip_validate(host)) { 1679 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); 1680 wbsd_chip_config(host); 1681 } 1682 } else 1683 wbsd_chip_config(host); 1684 1685 /* 1686 * Power Management stuff. No idea how this works. 1687 * Not tested. 1688 */ 1689 #ifdef CONFIG_PM 1690 if (host->config) { 1691 wbsd_unlock_config(host); 1692 wbsd_write_config(host, WBSD_CONF_PME, 0xA0); 1693 wbsd_lock_config(host); 1694 } 1695 #endif 1696 /* 1697 * Allow device to initialise itself properly. 1698 */ 1699 mdelay(5); 1700 1701 /* 1702 * Reset the chip into a known state. 1703 */ 1704 wbsd_init_device(host); 1705 1706 mmc_add_host(mmc); 1707 1708 pr_info("%s: W83L51xD", mmc_hostname(mmc)); 1709 if (host->chip_id != 0) 1710 printk(" id %x", (int)host->chip_id); 1711 printk(" at 0x%x irq %d", (int)host->base, (int)host->irq); 1712 if (host->dma >= 0) 1713 printk(" dma %d", (int)host->dma); 1714 else 1715 printk(" FIFO"); 1716 if (pnp) 1717 printk(" PnP"); 1718 printk("\n"); 1719 1720 return 0; 1721 } 1722 1723 static void wbsd_shutdown(struct device *dev, int pnp) 1724 { 1725 struct mmc_host *mmc = dev_get_drvdata(dev); 1726 struct wbsd_host *host; 1727 1728 if (!mmc) 1729 return; 1730 1731 host = mmc_priv(mmc); 1732 1733 mmc_remove_host(mmc); 1734 1735 /* 1736 * Power down the SD/MMC function. 1737 */ 1738 if (!pnp) 1739 wbsd_chip_poweroff(host); 1740 1741 wbsd_release_resources(host); 1742 1743 wbsd_free_mmc(dev); 1744 } 1745 1746 /* 1747 * Non-PnP 1748 */ 1749 1750 static int wbsd_probe(struct platform_device *dev) 1751 { 1752 /* Use the module parameters for resources */ 1753 return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0); 1754 } 1755 1756 static int wbsd_remove(struct platform_device *dev) 1757 { 1758 wbsd_shutdown(&dev->dev, 0); 1759 1760 return 0; 1761 } 1762 1763 /* 1764 * PnP 1765 */ 1766 1767 #ifdef CONFIG_PNP 1768 1769 static int 1770 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id) 1771 { 1772 int io, irq, dma; 1773 1774 /* 1775 * Get resources from PnP layer. 1776 */ 1777 io = pnp_port_start(pnpdev, 0); 1778 irq = pnp_irq(pnpdev, 0); 1779 if (pnp_dma_valid(pnpdev, 0)) 1780 dma = pnp_dma(pnpdev, 0); 1781 else 1782 dma = -1; 1783 1784 DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma); 1785 1786 return wbsd_init(&pnpdev->dev, io, irq, dma, 1); 1787 } 1788 1789 static void wbsd_pnp_remove(struct pnp_dev *dev) 1790 { 1791 wbsd_shutdown(&dev->dev, 1); 1792 } 1793 1794 #endif /* CONFIG_PNP */ 1795 1796 /* 1797 * Power management 1798 */ 1799 1800 #ifdef CONFIG_PM 1801 1802 static int wbsd_platform_suspend(struct platform_device *dev, 1803 pm_message_t state) 1804 { 1805 struct mmc_host *mmc = platform_get_drvdata(dev); 1806 struct wbsd_host *host; 1807 1808 if (mmc == NULL) 1809 return 0; 1810 1811 DBGF("Suspending...\n"); 1812 1813 host = mmc_priv(mmc); 1814 1815 wbsd_chip_poweroff(host); 1816 return 0; 1817 } 1818 1819 static int wbsd_platform_resume(struct platform_device *dev) 1820 { 1821 struct mmc_host *mmc = platform_get_drvdata(dev); 1822 struct wbsd_host *host; 1823 1824 if (mmc == NULL) 1825 return 0; 1826 1827 DBGF("Resuming...\n"); 1828 1829 host = mmc_priv(mmc); 1830 1831 wbsd_chip_config(host); 1832 1833 /* 1834 * Allow device to initialise itself properly. 1835 */ 1836 mdelay(5); 1837 1838 wbsd_init_device(host); 1839 return 0; 1840 } 1841 1842 #ifdef CONFIG_PNP 1843 1844 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state) 1845 { 1846 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1847 1848 if (mmc == NULL) 1849 return 0; 1850 1851 DBGF("Suspending...\n"); 1852 return 0; 1853 } 1854 1855 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev) 1856 { 1857 struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev); 1858 struct wbsd_host *host; 1859 1860 if (mmc == NULL) 1861 return 0; 1862 1863 DBGF("Resuming...\n"); 1864 1865 host = mmc_priv(mmc); 1866 1867 /* 1868 * See if chip needs to be configured. 1869 */ 1870 if (host->config != 0) { 1871 if (!wbsd_chip_validate(host)) { 1872 pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n"); 1873 wbsd_chip_config(host); 1874 } 1875 } 1876 1877 /* 1878 * Allow device to initialise itself properly. 1879 */ 1880 mdelay(5); 1881 1882 wbsd_init_device(host); 1883 return 0; 1884 } 1885 1886 #endif /* CONFIG_PNP */ 1887 1888 #else /* CONFIG_PM */ 1889 1890 #define wbsd_platform_suspend NULL 1891 #define wbsd_platform_resume NULL 1892 1893 #define wbsd_pnp_suspend NULL 1894 #define wbsd_pnp_resume NULL 1895 1896 #endif /* CONFIG_PM */ 1897 1898 static struct platform_device *wbsd_device; 1899 1900 static struct platform_driver wbsd_driver = { 1901 .probe = wbsd_probe, 1902 .remove = wbsd_remove, 1903 1904 .suspend = wbsd_platform_suspend, 1905 .resume = wbsd_platform_resume, 1906 .driver = { 1907 .name = DRIVER_NAME, 1908 }, 1909 }; 1910 1911 #ifdef CONFIG_PNP 1912 1913 static struct pnp_driver wbsd_pnp_driver = { 1914 .name = DRIVER_NAME, 1915 .id_table = pnp_dev_table, 1916 .probe = wbsd_pnp_probe, 1917 .remove = wbsd_pnp_remove, 1918 1919 .suspend = wbsd_pnp_suspend, 1920 .resume = wbsd_pnp_resume, 1921 }; 1922 1923 #endif /* CONFIG_PNP */ 1924 1925 /* 1926 * Module loading/unloading 1927 */ 1928 1929 static int __init wbsd_drv_init(void) 1930 { 1931 int result; 1932 1933 pr_info(DRIVER_NAME 1934 ": Winbond W83L51xD SD/MMC card interface driver\n"); 1935 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 1936 1937 #ifdef CONFIG_PNP 1938 1939 if (!param_nopnp) { 1940 result = pnp_register_driver(&wbsd_pnp_driver); 1941 if (result < 0) 1942 return result; 1943 } 1944 #endif /* CONFIG_PNP */ 1945 1946 if (param_nopnp) { 1947 result = platform_driver_register(&wbsd_driver); 1948 if (result < 0) 1949 return result; 1950 1951 wbsd_device = platform_device_alloc(DRIVER_NAME, -1); 1952 if (!wbsd_device) { 1953 platform_driver_unregister(&wbsd_driver); 1954 return -ENOMEM; 1955 } 1956 1957 result = platform_device_add(wbsd_device); 1958 if (result) { 1959 platform_device_put(wbsd_device); 1960 platform_driver_unregister(&wbsd_driver); 1961 return result; 1962 } 1963 } 1964 1965 return 0; 1966 } 1967 1968 static void __exit wbsd_drv_exit(void) 1969 { 1970 #ifdef CONFIG_PNP 1971 1972 if (!param_nopnp) 1973 pnp_unregister_driver(&wbsd_pnp_driver); 1974 1975 #endif /* CONFIG_PNP */ 1976 1977 if (param_nopnp) { 1978 platform_device_unregister(wbsd_device); 1979 1980 platform_driver_unregister(&wbsd_driver); 1981 } 1982 1983 DBG("unloaded\n"); 1984 } 1985 1986 module_init(wbsd_drv_init); 1987 module_exit(wbsd_drv_exit); 1988 #ifdef CONFIG_PNP 1989 module_param_hw_named(nopnp, param_nopnp, uint, other, 0444); 1990 #endif 1991 module_param_hw_named(io, param_io, uint, ioport, 0444); 1992 module_param_hw_named(irq, param_irq, uint, irq, 0444); 1993 module_param_hw_named(dma, param_dma, int, dma, 0444); 1994 1995 MODULE_LICENSE("GPL"); 1996 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 1997 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); 1998 1999 #ifdef CONFIG_PNP 2000 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)"); 2001 #endif 2002 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); 2003 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); 2004 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)"); 2005