1 /* 2 * linux/drivers/mmc/host/pxa.c - PXA MMCI driver 3 * 4 * Copyright (C) 2003 Russell King, 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 version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This hardware is really sick: 11 * - No way to clear interrupts. 12 * - Have to turn off the clock whenever we touch the device. 13 * - Doesn't tell you how many data blocks were transferred. 14 * Yuck! 15 * 16 * 1 and 3 byte data transfers not supported 17 * max block length up to 1023 18 */ 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/ioport.h> 22 #include <linux/platform_device.h> 23 #include <linux/delay.h> 24 #include <linux/interrupt.h> 25 #include <linux/dmaengine.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/clk.h> 28 #include <linux/err.h> 29 #include <linux/mmc/host.h> 30 #include <linux/mmc/slot-gpio.h> 31 #include <linux/io.h> 32 #include <linux/regulator/consumer.h> 33 #include <linux/gpio/consumer.h> 34 #include <linux/gfp.h> 35 #include <linux/of.h> 36 #include <linux/of_device.h> 37 38 #include <asm/sizes.h> 39 40 #include <mach/hardware.h> 41 #include <linux/platform_data/mmc-pxamci.h> 42 43 #include "pxamci.h" 44 45 #define DRIVER_NAME "pxa2xx-mci" 46 47 #define NR_SG 1 48 #define CLKRT_OFF (~0) 49 50 #define mmc_has_26MHz() (cpu_is_pxa300() || cpu_is_pxa310() \ 51 || cpu_is_pxa935()) 52 53 struct pxamci_host { 54 struct mmc_host *mmc; 55 spinlock_t lock; 56 struct resource *res; 57 void __iomem *base; 58 struct clk *clk; 59 unsigned long clkrate; 60 unsigned int clkrt; 61 unsigned int cmdat; 62 unsigned int imask; 63 unsigned int power_mode; 64 unsigned long detect_delay_ms; 65 bool use_ro_gpio; 66 struct gpio_desc *power; 67 struct pxamci_platform_data *pdata; 68 69 struct mmc_request *mrq; 70 struct mmc_command *cmd; 71 struct mmc_data *data; 72 73 struct dma_chan *dma_chan_rx; 74 struct dma_chan *dma_chan_tx; 75 dma_cookie_t dma_cookie; 76 unsigned int dma_len; 77 unsigned int dma_dir; 78 }; 79 80 static int pxamci_init_ocr(struct pxamci_host *host) 81 { 82 struct mmc_host *mmc = host->mmc; 83 int ret; 84 85 ret = mmc_regulator_get_supply(mmc); 86 if (ret < 0) 87 return ret; 88 89 if (IS_ERR(mmc->supply.vmmc)) { 90 /* fall-back to platform data */ 91 mmc->ocr_avail = host->pdata ? 92 host->pdata->ocr_mask : 93 MMC_VDD_32_33 | MMC_VDD_33_34; 94 } 95 96 return 0; 97 } 98 99 static inline int pxamci_set_power(struct pxamci_host *host, 100 unsigned char power_mode, 101 unsigned int vdd) 102 { 103 struct mmc_host *mmc = host->mmc; 104 struct regulator *supply = mmc->supply.vmmc; 105 106 if (!IS_ERR(supply)) 107 return mmc_regulator_set_ocr(mmc, supply, vdd); 108 109 if (host->power) { 110 bool on = !!((1 << vdd) & host->pdata->ocr_mask); 111 gpiod_set_value(host->power, on); 112 } 113 114 if (host->pdata && host->pdata->setpower) 115 return host->pdata->setpower(mmc_dev(host->mmc), vdd); 116 117 return 0; 118 } 119 120 static void pxamci_stop_clock(struct pxamci_host *host) 121 { 122 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) { 123 unsigned long timeout = 10000; 124 unsigned int v; 125 126 writel(STOP_CLOCK, host->base + MMC_STRPCL); 127 128 do { 129 v = readl(host->base + MMC_STAT); 130 if (!(v & STAT_CLK_EN)) 131 break; 132 udelay(1); 133 } while (timeout--); 134 135 if (v & STAT_CLK_EN) 136 dev_err(mmc_dev(host->mmc), "unable to stop clock\n"); 137 } 138 } 139 140 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask) 141 { 142 unsigned long flags; 143 144 spin_lock_irqsave(&host->lock, flags); 145 host->imask &= ~mask; 146 writel(host->imask, host->base + MMC_I_MASK); 147 spin_unlock_irqrestore(&host->lock, flags); 148 } 149 150 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask) 151 { 152 unsigned long flags; 153 154 spin_lock_irqsave(&host->lock, flags); 155 host->imask |= mask; 156 writel(host->imask, host->base + MMC_I_MASK); 157 spin_unlock_irqrestore(&host->lock, flags); 158 } 159 160 static void pxamci_dma_irq(void *param); 161 162 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data) 163 { 164 struct dma_async_tx_descriptor *tx; 165 enum dma_data_direction direction; 166 struct dma_slave_config config; 167 struct dma_chan *chan; 168 unsigned int nob = data->blocks; 169 unsigned long long clks; 170 unsigned int timeout; 171 int ret; 172 173 host->data = data; 174 175 writel(nob, host->base + MMC_NOB); 176 writel(data->blksz, host->base + MMC_BLKLEN); 177 178 clks = (unsigned long long)data->timeout_ns * host->clkrate; 179 do_div(clks, 1000000000UL); 180 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt); 181 writel((timeout + 255) / 256, host->base + MMC_RDTO); 182 183 memset(&config, 0, sizeof(config)); 184 config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 185 config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 186 config.src_addr = host->res->start + MMC_RXFIFO; 187 config.dst_addr = host->res->start + MMC_TXFIFO; 188 config.src_maxburst = 32; 189 config.dst_maxburst = 32; 190 191 if (data->flags & MMC_DATA_READ) { 192 host->dma_dir = DMA_FROM_DEVICE; 193 direction = DMA_DEV_TO_MEM; 194 chan = host->dma_chan_rx; 195 } else { 196 host->dma_dir = DMA_TO_DEVICE; 197 direction = DMA_MEM_TO_DEV; 198 chan = host->dma_chan_tx; 199 } 200 201 config.direction = direction; 202 203 ret = dmaengine_slave_config(chan, &config); 204 if (ret < 0) { 205 dev_err(mmc_dev(host->mmc), "dma slave config failed\n"); 206 return; 207 } 208 209 host->dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len, 210 host->dma_dir); 211 212 tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction, 213 DMA_PREP_INTERRUPT); 214 if (!tx) { 215 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n"); 216 return; 217 } 218 219 if (!(data->flags & MMC_DATA_READ)) { 220 tx->callback = pxamci_dma_irq; 221 tx->callback_param = host; 222 } 223 224 host->dma_cookie = dmaengine_submit(tx); 225 226 /* 227 * workaround for erratum #91: 228 * only start DMA now if we are doing a read, 229 * otherwise we wait until CMD/RESP has finished 230 * before starting DMA. 231 */ 232 if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ) 233 dma_async_issue_pending(chan); 234 } 235 236 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat) 237 { 238 WARN_ON(host->cmd != NULL); 239 host->cmd = cmd; 240 241 if (cmd->flags & MMC_RSP_BUSY) 242 cmdat |= CMDAT_BUSY; 243 244 #define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE)) 245 switch (RSP_TYPE(mmc_resp_type(cmd))) { 246 case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */ 247 cmdat |= CMDAT_RESP_SHORT; 248 break; 249 case RSP_TYPE(MMC_RSP_R3): 250 cmdat |= CMDAT_RESP_R3; 251 break; 252 case RSP_TYPE(MMC_RSP_R2): 253 cmdat |= CMDAT_RESP_R2; 254 break; 255 default: 256 break; 257 } 258 259 writel(cmd->opcode, host->base + MMC_CMD); 260 writel(cmd->arg >> 16, host->base + MMC_ARGH); 261 writel(cmd->arg & 0xffff, host->base + MMC_ARGL); 262 writel(cmdat, host->base + MMC_CMDAT); 263 writel(host->clkrt, host->base + MMC_CLKRT); 264 265 writel(START_CLOCK, host->base + MMC_STRPCL); 266 267 pxamci_enable_irq(host, END_CMD_RES); 268 } 269 270 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq) 271 { 272 host->mrq = NULL; 273 host->cmd = NULL; 274 host->data = NULL; 275 mmc_request_done(host->mmc, mrq); 276 } 277 278 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat) 279 { 280 struct mmc_command *cmd = host->cmd; 281 int i; 282 u32 v; 283 284 if (!cmd) 285 return 0; 286 287 host->cmd = NULL; 288 289 /* 290 * Did I mention this is Sick. We always need to 291 * discard the upper 8 bits of the first 16-bit word. 292 */ 293 v = readl(host->base + MMC_RES) & 0xffff; 294 for (i = 0; i < 4; i++) { 295 u32 w1 = readl(host->base + MMC_RES) & 0xffff; 296 u32 w2 = readl(host->base + MMC_RES) & 0xffff; 297 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8; 298 v = w2; 299 } 300 301 if (stat & STAT_TIME_OUT_RESPONSE) { 302 cmd->error = -ETIMEDOUT; 303 } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 304 /* 305 * workaround for erratum #42: 306 * Intel PXA27x Family Processor Specification Update Rev 001 307 * A bogus CRC error can appear if the msb of a 136 bit 308 * response is a one. 309 */ 310 if (cpu_is_pxa27x() && 311 (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000)) 312 pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode); 313 else 314 cmd->error = -EILSEQ; 315 } 316 317 pxamci_disable_irq(host, END_CMD_RES); 318 if (host->data && !cmd->error) { 319 pxamci_enable_irq(host, DATA_TRAN_DONE); 320 /* 321 * workaround for erratum #91, if doing write 322 * enable DMA late 323 */ 324 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE) 325 dma_async_issue_pending(host->dma_chan_tx); 326 } else { 327 pxamci_finish_request(host, host->mrq); 328 } 329 330 return 1; 331 } 332 333 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat) 334 { 335 struct mmc_data *data = host->data; 336 struct dma_chan *chan; 337 338 if (!data) 339 return 0; 340 341 if (data->flags & MMC_DATA_READ) 342 chan = host->dma_chan_rx; 343 else 344 chan = host->dma_chan_tx; 345 dma_unmap_sg(chan->device->dev, 346 data->sg, data->sg_len, host->dma_dir); 347 348 if (stat & STAT_READ_TIME_OUT) 349 data->error = -ETIMEDOUT; 350 else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR)) 351 data->error = -EILSEQ; 352 353 /* 354 * There appears to be a hardware design bug here. There seems to 355 * be no way to find out how much data was transferred to the card. 356 * This means that if there was an error on any block, we mark all 357 * data blocks as being in error. 358 */ 359 if (!data->error) 360 data->bytes_xfered = data->blocks * data->blksz; 361 else 362 data->bytes_xfered = 0; 363 364 pxamci_disable_irq(host, DATA_TRAN_DONE); 365 366 host->data = NULL; 367 if (host->mrq->stop) { 368 pxamci_stop_clock(host); 369 pxamci_start_cmd(host, host->mrq->stop, host->cmdat); 370 } else { 371 pxamci_finish_request(host, host->mrq); 372 } 373 374 return 1; 375 } 376 377 static irqreturn_t pxamci_irq(int irq, void *devid) 378 { 379 struct pxamci_host *host = devid; 380 unsigned int ireg; 381 int handled = 0; 382 383 ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK); 384 385 if (ireg) { 386 unsigned stat = readl(host->base + MMC_STAT); 387 388 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat); 389 390 if (ireg & END_CMD_RES) 391 handled |= pxamci_cmd_done(host, stat); 392 if (ireg & DATA_TRAN_DONE) 393 handled |= pxamci_data_done(host, stat); 394 if (ireg & SDIO_INT) { 395 mmc_signal_sdio_irq(host->mmc); 396 handled = 1; 397 } 398 } 399 400 return IRQ_RETVAL(handled); 401 } 402 403 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq) 404 { 405 struct pxamci_host *host = mmc_priv(mmc); 406 unsigned int cmdat; 407 408 WARN_ON(host->mrq != NULL); 409 410 host->mrq = mrq; 411 412 pxamci_stop_clock(host); 413 414 cmdat = host->cmdat; 415 host->cmdat &= ~CMDAT_INIT; 416 417 if (mrq->data) { 418 pxamci_setup_data(host, mrq->data); 419 420 cmdat &= ~CMDAT_BUSY; 421 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN; 422 if (mrq->data->flags & MMC_DATA_WRITE) 423 cmdat |= CMDAT_WRITE; 424 } 425 426 pxamci_start_cmd(host, mrq->cmd, cmdat); 427 } 428 429 static int pxamci_get_ro(struct mmc_host *mmc) 430 { 431 struct pxamci_host *host = mmc_priv(mmc); 432 433 if (host->use_ro_gpio) 434 return mmc_gpio_get_ro(mmc); 435 if (host->pdata && host->pdata->get_ro) 436 return !!host->pdata->get_ro(mmc_dev(mmc)); 437 /* 438 * Board doesn't support read only detection; let the mmc core 439 * decide what to do. 440 */ 441 return -ENOSYS; 442 } 443 444 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 445 { 446 struct pxamci_host *host = mmc_priv(mmc); 447 448 if (ios->clock) { 449 unsigned long rate = host->clkrate; 450 unsigned int clk = rate / ios->clock; 451 452 if (host->clkrt == CLKRT_OFF) 453 clk_prepare_enable(host->clk); 454 455 if (ios->clock == 26000000) { 456 /* to support 26MHz */ 457 host->clkrt = 7; 458 } else { 459 /* to handle (19.5MHz, 26MHz) */ 460 if (!clk) 461 clk = 1; 462 463 /* 464 * clk might result in a lower divisor than we 465 * desire. check for that condition and adjust 466 * as appropriate. 467 */ 468 if (rate / clk > ios->clock) 469 clk <<= 1; 470 host->clkrt = fls(clk) - 1; 471 } 472 473 /* 474 * we write clkrt on the next command 475 */ 476 } else { 477 pxamci_stop_clock(host); 478 if (host->clkrt != CLKRT_OFF) { 479 host->clkrt = CLKRT_OFF; 480 clk_disable_unprepare(host->clk); 481 } 482 } 483 484 if (host->power_mode != ios->power_mode) { 485 int ret; 486 487 host->power_mode = ios->power_mode; 488 489 ret = pxamci_set_power(host, ios->power_mode, ios->vdd); 490 if (ret) { 491 dev_err(mmc_dev(mmc), "unable to set power\n"); 492 /* 493 * The .set_ios() function in the mmc_host_ops 494 * struct return void, and failing to set the 495 * power should be rare so we print an error and 496 * return here. 497 */ 498 return; 499 } 500 501 if (ios->power_mode == MMC_POWER_ON) 502 host->cmdat |= CMDAT_INIT; 503 } 504 505 if (ios->bus_width == MMC_BUS_WIDTH_4) 506 host->cmdat |= CMDAT_SD_4DAT; 507 else 508 host->cmdat &= ~CMDAT_SD_4DAT; 509 510 dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n", 511 host->clkrt, host->cmdat); 512 } 513 514 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable) 515 { 516 struct pxamci_host *pxa_host = mmc_priv(host); 517 518 if (enable) 519 pxamci_enable_irq(pxa_host, SDIO_INT); 520 else 521 pxamci_disable_irq(pxa_host, SDIO_INT); 522 } 523 524 static const struct mmc_host_ops pxamci_ops = { 525 .request = pxamci_request, 526 .get_cd = mmc_gpio_get_cd, 527 .get_ro = pxamci_get_ro, 528 .set_ios = pxamci_set_ios, 529 .enable_sdio_irq = pxamci_enable_sdio_irq, 530 }; 531 532 static void pxamci_dma_irq(void *param) 533 { 534 struct pxamci_host *host = param; 535 struct dma_tx_state state; 536 enum dma_status status; 537 struct dma_chan *chan; 538 unsigned long flags; 539 540 spin_lock_irqsave(&host->lock, flags); 541 542 if (!host->data) 543 goto out_unlock; 544 545 if (host->data->flags & MMC_DATA_READ) 546 chan = host->dma_chan_rx; 547 else 548 chan = host->dma_chan_tx; 549 550 status = dmaengine_tx_status(chan, host->dma_cookie, &state); 551 552 if (likely(status == DMA_COMPLETE)) { 553 writel(BUF_PART_FULL, host->base + MMC_PRTBUF); 554 } else { 555 pr_err("%s: DMA error on %s channel\n", mmc_hostname(host->mmc), 556 host->data->flags & MMC_DATA_READ ? "rx" : "tx"); 557 host->data->error = -EIO; 558 pxamci_data_done(host, 0); 559 } 560 561 out_unlock: 562 spin_unlock_irqrestore(&host->lock, flags); 563 } 564 565 static irqreturn_t pxamci_detect_irq(int irq, void *devid) 566 { 567 struct pxamci_host *host = mmc_priv(devid); 568 569 mmc_detect_change(devid, msecs_to_jiffies(host->detect_delay_ms)); 570 return IRQ_HANDLED; 571 } 572 573 #ifdef CONFIG_OF 574 static const struct of_device_id pxa_mmc_dt_ids[] = { 575 { .compatible = "marvell,pxa-mmc" }, 576 { } 577 }; 578 579 MODULE_DEVICE_TABLE(of, pxa_mmc_dt_ids); 580 581 static int pxamci_of_init(struct platform_device *pdev, 582 struct mmc_host *mmc) 583 { 584 struct device_node *np = pdev->dev.of_node; 585 struct pxamci_host *host = mmc_priv(mmc); 586 u32 tmp; 587 int ret; 588 589 if (!np) 590 return 0; 591 592 /* pxa-mmc specific */ 593 if (of_property_read_u32(np, "pxa-mmc,detect-delay-ms", &tmp) == 0) 594 host->detect_delay_ms = tmp; 595 596 ret = mmc_of_parse(mmc); 597 if (ret < 0) 598 return ret; 599 600 return 0; 601 } 602 #else 603 static int pxamci_of_init(struct platform_device *pdev, 604 struct mmc_host *mmc) 605 { 606 return 0; 607 } 608 #endif 609 610 static int pxamci_probe(struct platform_device *pdev) 611 { 612 struct mmc_host *mmc; 613 struct pxamci_host *host = NULL; 614 struct device *dev = &pdev->dev; 615 struct resource *r; 616 int ret, irq; 617 618 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 619 irq = platform_get_irq(pdev, 0); 620 if (irq < 0) 621 return irq; 622 623 mmc = mmc_alloc_host(sizeof(struct pxamci_host), dev); 624 if (!mmc) { 625 ret = -ENOMEM; 626 goto out; 627 } 628 629 mmc->ops = &pxamci_ops; 630 631 /* 632 * We can do SG-DMA, but we don't because we never know how much 633 * data we successfully wrote to the card. 634 */ 635 mmc->max_segs = NR_SG; 636 637 /* 638 * Our hardware DMA can handle a maximum of one page per SG entry. 639 */ 640 mmc->max_seg_size = PAGE_SIZE; 641 642 /* 643 * Block length register is only 10 bits before PXA27x. 644 */ 645 mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048; 646 647 /* 648 * Block count register is 16 bits. 649 */ 650 mmc->max_blk_count = 65535; 651 652 ret = pxamci_of_init(pdev, mmc); 653 if (ret) 654 return ret; 655 656 host = mmc_priv(mmc); 657 host->mmc = mmc; 658 host->pdata = pdev->dev.platform_data; 659 host->clkrt = CLKRT_OFF; 660 661 host->clk = devm_clk_get(dev, NULL); 662 if (IS_ERR(host->clk)) { 663 ret = PTR_ERR(host->clk); 664 host->clk = NULL; 665 goto out; 666 } 667 668 host->clkrate = clk_get_rate(host->clk); 669 670 /* 671 * Calculate minimum clock rate, rounding up. 672 */ 673 mmc->f_min = (host->clkrate + 63) / 64; 674 mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate; 675 676 ret = pxamci_init_ocr(host); 677 if (ret < 0) 678 return ret; 679 680 mmc->caps = 0; 681 host->cmdat = 0; 682 if (!cpu_is_pxa25x()) { 683 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 684 host->cmdat |= CMDAT_SDIO_INT_EN; 685 if (mmc_has_26MHz()) 686 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | 687 MMC_CAP_SD_HIGHSPEED; 688 } 689 690 spin_lock_init(&host->lock); 691 host->res = r; 692 host->imask = MMC_I_MASK_ALL; 693 694 host->base = devm_ioremap_resource(dev, r); 695 if (IS_ERR(host->base)) { 696 ret = PTR_ERR(host->base); 697 goto out; 698 } 699 700 /* 701 * Ensure that the host controller is shut down, and setup 702 * with our defaults. 703 */ 704 pxamci_stop_clock(host); 705 writel(0, host->base + MMC_SPI); 706 writel(64, host->base + MMC_RESTO); 707 writel(host->imask, host->base + MMC_I_MASK); 708 709 ret = devm_request_irq(dev, irq, pxamci_irq, 0, 710 DRIVER_NAME, host); 711 if (ret) 712 goto out; 713 714 platform_set_drvdata(pdev, mmc); 715 716 host->dma_chan_rx = dma_request_slave_channel(dev, "rx"); 717 if (host->dma_chan_rx == NULL) { 718 dev_err(dev, "unable to request rx dma channel\n"); 719 ret = -ENODEV; 720 goto out; 721 } 722 723 host->dma_chan_tx = dma_request_slave_channel(dev, "tx"); 724 if (host->dma_chan_tx == NULL) { 725 dev_err(dev, "unable to request tx dma channel\n"); 726 ret = -ENODEV; 727 goto out; 728 } 729 730 if (host->pdata) { 731 host->detect_delay_ms = host->pdata->detect_delay_ms; 732 733 host->power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW); 734 if (IS_ERR(host->power)) { 735 dev_err(dev, "Failed requesting gpio_power\n"); 736 goto out; 737 } 738 739 /* FIXME: should we pass detection delay to debounce? */ 740 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL); 741 if (ret && ret != -ENOENT) { 742 dev_err(dev, "Failed requesting gpio_cd\n"); 743 goto out; 744 } 745 746 ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL); 747 if (ret && ret != -ENOENT) { 748 dev_err(dev, "Failed requesting gpio_ro\n"); 749 goto out; 750 } 751 if (!ret) { 752 host->use_ro_gpio = true; 753 mmc->caps2 |= host->pdata->gpio_card_ro_invert ? 754 0 : MMC_CAP2_RO_ACTIVE_HIGH; 755 } 756 757 if (host->pdata->init) 758 host->pdata->init(dev, pxamci_detect_irq, mmc); 759 760 if (host->power && host->pdata->setpower) 761 dev_warn(dev, "gpio_power and setpower() both defined\n"); 762 if (host->use_ro_gpio && host->pdata->get_ro) 763 dev_warn(dev, "gpio_ro and get_ro() both defined\n"); 764 } 765 766 mmc_add_host(mmc); 767 768 return 0; 769 770 out: 771 if (host) { 772 if (host->dma_chan_rx) 773 dma_release_channel(host->dma_chan_rx); 774 if (host->dma_chan_tx) 775 dma_release_channel(host->dma_chan_tx); 776 } 777 if (mmc) 778 mmc_free_host(mmc); 779 return ret; 780 } 781 782 static int pxamci_remove(struct platform_device *pdev) 783 { 784 struct mmc_host *mmc = platform_get_drvdata(pdev); 785 786 if (mmc) { 787 struct pxamci_host *host = mmc_priv(mmc); 788 789 mmc_remove_host(mmc); 790 791 if (host->pdata && host->pdata->exit) 792 host->pdata->exit(&pdev->dev, mmc); 793 794 pxamci_stop_clock(host); 795 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD| 796 END_CMD_RES|PRG_DONE|DATA_TRAN_DONE, 797 host->base + MMC_I_MASK); 798 799 dmaengine_terminate_all(host->dma_chan_rx); 800 dmaengine_terminate_all(host->dma_chan_tx); 801 dma_release_channel(host->dma_chan_rx); 802 dma_release_channel(host->dma_chan_tx); 803 804 mmc_free_host(mmc); 805 } 806 807 return 0; 808 } 809 810 static struct platform_driver pxamci_driver = { 811 .probe = pxamci_probe, 812 .remove = pxamci_remove, 813 .driver = { 814 .name = DRIVER_NAME, 815 .of_match_table = of_match_ptr(pxa_mmc_dt_ids), 816 }, 817 }; 818 819 module_platform_driver(pxamci_driver); 820 821 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver"); 822 MODULE_LICENSE("GPL"); 823 MODULE_ALIAS("platform:pxa2xx-mci"); 824