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/dma/pxa-dma.h> 28 #include <linux/clk.h> 29 #include <linux/err.h> 30 #include <linux/mmc/host.h> 31 #include <linux/mmc/slot-gpio.h> 32 #include <linux/io.h> 33 #include <linux/regulator/consumer.h> 34 #include <linux/gpio.h> 35 #include <linux/gfp.h> 36 #include <linux/of.h> 37 #include <linux/of_gpio.h> 38 #include <linux/of_device.h> 39 40 #include <asm/sizes.h> 41 42 #include <mach/hardware.h> 43 #include <linux/platform_data/mmc-pxamci.h> 44 45 #include "pxamci.h" 46 47 #define DRIVER_NAME "pxa2xx-mci" 48 49 #define NR_SG 1 50 #define CLKRT_OFF (~0) 51 52 #define mmc_has_26MHz() (cpu_is_pxa300() || cpu_is_pxa310() \ 53 || cpu_is_pxa935()) 54 55 struct pxamci_host { 56 struct mmc_host *mmc; 57 spinlock_t lock; 58 struct resource *res; 59 void __iomem *base; 60 struct clk *clk; 61 unsigned long clkrate; 62 int irq; 63 unsigned int clkrt; 64 unsigned int cmdat; 65 unsigned int imask; 66 unsigned int power_mode; 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 dma_addr_t sg_dma; 77 unsigned int dma_len; 78 79 unsigned int dma_dir; 80 unsigned int dma_drcmrrx; 81 unsigned int dma_drcmrtx; 82 83 struct regulator *vcc; 84 }; 85 86 static inline void pxamci_init_ocr(struct pxamci_host *host) 87 { 88 #ifdef CONFIG_REGULATOR 89 host->vcc = devm_regulator_get_optional(mmc_dev(host->mmc), "vmmc"); 90 91 if (IS_ERR(host->vcc)) 92 host->vcc = NULL; 93 else { 94 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc); 95 if (host->pdata && host->pdata->ocr_mask) 96 dev_warn(mmc_dev(host->mmc), 97 "ocr_mask/setpower will not be used\n"); 98 } 99 #endif 100 if (host->vcc == NULL) { 101 /* fall-back to platform data */ 102 host->mmc->ocr_avail = host->pdata ? 103 host->pdata->ocr_mask : 104 MMC_VDD_32_33 | MMC_VDD_33_34; 105 } 106 } 107 108 static inline int pxamci_set_power(struct pxamci_host *host, 109 unsigned char power_mode, 110 unsigned int vdd) 111 { 112 int on; 113 114 if (host->vcc) { 115 int ret; 116 117 if (power_mode == MMC_POWER_UP) { 118 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); 119 if (ret) 120 return ret; 121 } else if (power_mode == MMC_POWER_OFF) { 122 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0); 123 if (ret) 124 return ret; 125 } 126 } 127 if (!host->vcc && host->pdata && 128 gpio_is_valid(host->pdata->gpio_power)) { 129 on = ((1 << vdd) & host->pdata->ocr_mask); 130 gpio_set_value(host->pdata->gpio_power, 131 !!on ^ host->pdata->gpio_power_invert); 132 } 133 if (!host->vcc && host->pdata && host->pdata->setpower) 134 return host->pdata->setpower(mmc_dev(host->mmc), vdd); 135 136 return 0; 137 } 138 139 static void pxamci_stop_clock(struct pxamci_host *host) 140 { 141 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) { 142 unsigned long timeout = 10000; 143 unsigned int v; 144 145 writel(STOP_CLOCK, host->base + MMC_STRPCL); 146 147 do { 148 v = readl(host->base + MMC_STAT); 149 if (!(v & STAT_CLK_EN)) 150 break; 151 udelay(1); 152 } while (timeout--); 153 154 if (v & STAT_CLK_EN) 155 dev_err(mmc_dev(host->mmc), "unable to stop clock\n"); 156 } 157 } 158 159 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask) 160 { 161 unsigned long flags; 162 163 spin_lock_irqsave(&host->lock, flags); 164 host->imask &= ~mask; 165 writel(host->imask, host->base + MMC_I_MASK); 166 spin_unlock_irqrestore(&host->lock, flags); 167 } 168 169 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask) 170 { 171 unsigned long flags; 172 173 spin_lock_irqsave(&host->lock, flags); 174 host->imask |= mask; 175 writel(host->imask, host->base + MMC_I_MASK); 176 spin_unlock_irqrestore(&host->lock, flags); 177 } 178 179 static void pxamci_dma_irq(void *param); 180 181 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data) 182 { 183 struct dma_async_tx_descriptor *tx; 184 enum dma_data_direction direction; 185 struct dma_slave_config config; 186 struct dma_chan *chan; 187 unsigned int nob = data->blocks; 188 unsigned long long clks; 189 unsigned int timeout; 190 int ret; 191 192 host->data = data; 193 194 writel(nob, host->base + MMC_NOB); 195 writel(data->blksz, host->base + MMC_BLKLEN); 196 197 clks = (unsigned long long)data->timeout_ns * host->clkrate; 198 do_div(clks, 1000000000UL); 199 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt); 200 writel((timeout + 255) / 256, host->base + MMC_RDTO); 201 202 memset(&config, 0, sizeof(config)); 203 config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 204 config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 205 config.src_addr = host->res->start + MMC_RXFIFO; 206 config.dst_addr = host->res->start + MMC_TXFIFO; 207 config.src_maxburst = 32; 208 config.dst_maxburst = 32; 209 210 if (data->flags & MMC_DATA_READ) { 211 host->dma_dir = DMA_FROM_DEVICE; 212 direction = DMA_DEV_TO_MEM; 213 chan = host->dma_chan_rx; 214 } else { 215 host->dma_dir = DMA_TO_DEVICE; 216 direction = DMA_MEM_TO_DEV; 217 chan = host->dma_chan_tx; 218 } 219 220 config.direction = direction; 221 222 ret = dmaengine_slave_config(chan, &config); 223 if (ret < 0) { 224 dev_err(mmc_dev(host->mmc), "dma slave config failed\n"); 225 return; 226 } 227 228 host->dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len, 229 host->dma_dir); 230 231 tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction, 232 DMA_PREP_INTERRUPT); 233 if (!tx) { 234 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n"); 235 return; 236 } 237 238 if (!(data->flags & MMC_DATA_READ)) { 239 tx->callback = pxamci_dma_irq; 240 tx->callback_param = host; 241 } 242 243 host->dma_cookie = dmaengine_submit(tx); 244 245 /* 246 * workaround for erratum #91: 247 * only start DMA now if we are doing a read, 248 * otherwise we wait until CMD/RESP has finished 249 * before starting DMA. 250 */ 251 if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ) 252 dma_async_issue_pending(chan); 253 } 254 255 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat) 256 { 257 WARN_ON(host->cmd != NULL); 258 host->cmd = cmd; 259 260 if (cmd->flags & MMC_RSP_BUSY) 261 cmdat |= CMDAT_BUSY; 262 263 #define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE)) 264 switch (RSP_TYPE(mmc_resp_type(cmd))) { 265 case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */ 266 cmdat |= CMDAT_RESP_SHORT; 267 break; 268 case RSP_TYPE(MMC_RSP_R3): 269 cmdat |= CMDAT_RESP_R3; 270 break; 271 case RSP_TYPE(MMC_RSP_R2): 272 cmdat |= CMDAT_RESP_R2; 273 break; 274 default: 275 break; 276 } 277 278 writel(cmd->opcode, host->base + MMC_CMD); 279 writel(cmd->arg >> 16, host->base + MMC_ARGH); 280 writel(cmd->arg & 0xffff, host->base + MMC_ARGL); 281 writel(cmdat, host->base + MMC_CMDAT); 282 writel(host->clkrt, host->base + MMC_CLKRT); 283 284 writel(START_CLOCK, host->base + MMC_STRPCL); 285 286 pxamci_enable_irq(host, END_CMD_RES); 287 } 288 289 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq) 290 { 291 host->mrq = NULL; 292 host->cmd = NULL; 293 host->data = NULL; 294 mmc_request_done(host->mmc, mrq); 295 } 296 297 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat) 298 { 299 struct mmc_command *cmd = host->cmd; 300 int i; 301 u32 v; 302 303 if (!cmd) 304 return 0; 305 306 host->cmd = NULL; 307 308 /* 309 * Did I mention this is Sick. We always need to 310 * discard the upper 8 bits of the first 16-bit word. 311 */ 312 v = readl(host->base + MMC_RES) & 0xffff; 313 for (i = 0; i < 4; i++) { 314 u32 w1 = readl(host->base + MMC_RES) & 0xffff; 315 u32 w2 = readl(host->base + MMC_RES) & 0xffff; 316 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8; 317 v = w2; 318 } 319 320 if (stat & STAT_TIME_OUT_RESPONSE) { 321 cmd->error = -ETIMEDOUT; 322 } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 323 /* 324 * workaround for erratum #42: 325 * Intel PXA27x Family Processor Specification Update Rev 001 326 * A bogus CRC error can appear if the msb of a 136 bit 327 * response is a one. 328 */ 329 if (cpu_is_pxa27x() && 330 (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000)) 331 pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode); 332 else 333 cmd->error = -EILSEQ; 334 } 335 336 pxamci_disable_irq(host, END_CMD_RES); 337 if (host->data && !cmd->error) { 338 pxamci_enable_irq(host, DATA_TRAN_DONE); 339 /* 340 * workaround for erratum #91, if doing write 341 * enable DMA late 342 */ 343 if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE) 344 dma_async_issue_pending(host->dma_chan_tx); 345 } else { 346 pxamci_finish_request(host, host->mrq); 347 } 348 349 return 1; 350 } 351 352 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat) 353 { 354 struct mmc_data *data = host->data; 355 struct dma_chan *chan; 356 357 if (!data) 358 return 0; 359 360 if (data->flags & MMC_DATA_READ) 361 chan = host->dma_chan_rx; 362 else 363 chan = host->dma_chan_tx; 364 dma_unmap_sg(chan->device->dev, 365 data->sg, data->sg_len, host->dma_dir); 366 367 if (stat & STAT_READ_TIME_OUT) 368 data->error = -ETIMEDOUT; 369 else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR)) 370 data->error = -EILSEQ; 371 372 /* 373 * There appears to be a hardware design bug here. There seems to 374 * be no way to find out how much data was transferred to the card. 375 * This means that if there was an error on any block, we mark all 376 * data blocks as being in error. 377 */ 378 if (!data->error) 379 data->bytes_xfered = data->blocks * data->blksz; 380 else 381 data->bytes_xfered = 0; 382 383 pxamci_disable_irq(host, DATA_TRAN_DONE); 384 385 host->data = NULL; 386 if (host->mrq->stop) { 387 pxamci_stop_clock(host); 388 pxamci_start_cmd(host, host->mrq->stop, host->cmdat); 389 } else { 390 pxamci_finish_request(host, host->mrq); 391 } 392 393 return 1; 394 } 395 396 static irqreturn_t pxamci_irq(int irq, void *devid) 397 { 398 struct pxamci_host *host = devid; 399 unsigned int ireg; 400 int handled = 0; 401 402 ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK); 403 404 if (ireg) { 405 unsigned stat = readl(host->base + MMC_STAT); 406 407 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat); 408 409 if (ireg & END_CMD_RES) 410 handled |= pxamci_cmd_done(host, stat); 411 if (ireg & DATA_TRAN_DONE) 412 handled |= pxamci_data_done(host, stat); 413 if (ireg & SDIO_INT) { 414 mmc_signal_sdio_irq(host->mmc); 415 handled = 1; 416 } 417 } 418 419 return IRQ_RETVAL(handled); 420 } 421 422 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq) 423 { 424 struct pxamci_host *host = mmc_priv(mmc); 425 unsigned int cmdat; 426 427 WARN_ON(host->mrq != NULL); 428 429 host->mrq = mrq; 430 431 pxamci_stop_clock(host); 432 433 cmdat = host->cmdat; 434 host->cmdat &= ~CMDAT_INIT; 435 436 if (mrq->data) { 437 pxamci_setup_data(host, mrq->data); 438 439 cmdat &= ~CMDAT_BUSY; 440 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN; 441 if (mrq->data->flags & MMC_DATA_WRITE) 442 cmdat |= CMDAT_WRITE; 443 } 444 445 pxamci_start_cmd(host, mrq->cmd, cmdat); 446 } 447 448 static int pxamci_get_ro(struct mmc_host *mmc) 449 { 450 struct pxamci_host *host = mmc_priv(mmc); 451 452 if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro)) 453 return mmc_gpio_get_ro(mmc); 454 if (host->pdata && host->pdata->get_ro) 455 return !!host->pdata->get_ro(mmc_dev(mmc)); 456 /* 457 * Board doesn't support read only detection; let the mmc core 458 * decide what to do. 459 */ 460 return -ENOSYS; 461 } 462 463 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 464 { 465 struct pxamci_host *host = mmc_priv(mmc); 466 467 if (ios->clock) { 468 unsigned long rate = host->clkrate; 469 unsigned int clk = rate / ios->clock; 470 471 if (host->clkrt == CLKRT_OFF) 472 clk_prepare_enable(host->clk); 473 474 if (ios->clock == 26000000) { 475 /* to support 26MHz */ 476 host->clkrt = 7; 477 } else { 478 /* to handle (19.5MHz, 26MHz) */ 479 if (!clk) 480 clk = 1; 481 482 /* 483 * clk might result in a lower divisor than we 484 * desire. check for that condition and adjust 485 * as appropriate. 486 */ 487 if (rate / clk > ios->clock) 488 clk <<= 1; 489 host->clkrt = fls(clk) - 1; 490 } 491 492 /* 493 * we write clkrt on the next command 494 */ 495 } else { 496 pxamci_stop_clock(host); 497 if (host->clkrt != CLKRT_OFF) { 498 host->clkrt = CLKRT_OFF; 499 clk_disable_unprepare(host->clk); 500 } 501 } 502 503 if (host->power_mode != ios->power_mode) { 504 int ret; 505 506 host->power_mode = ios->power_mode; 507 508 ret = pxamci_set_power(host, ios->power_mode, ios->vdd); 509 if (ret) { 510 dev_err(mmc_dev(mmc), "unable to set power\n"); 511 /* 512 * The .set_ios() function in the mmc_host_ops 513 * struct return void, and failing to set the 514 * power should be rare so we print an error and 515 * return here. 516 */ 517 return; 518 } 519 520 if (ios->power_mode == MMC_POWER_ON) 521 host->cmdat |= CMDAT_INIT; 522 } 523 524 if (ios->bus_width == MMC_BUS_WIDTH_4) 525 host->cmdat |= CMDAT_SD_4DAT; 526 else 527 host->cmdat &= ~CMDAT_SD_4DAT; 528 529 dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n", 530 host->clkrt, host->cmdat); 531 } 532 533 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable) 534 { 535 struct pxamci_host *pxa_host = mmc_priv(host); 536 537 if (enable) 538 pxamci_enable_irq(pxa_host, SDIO_INT); 539 else 540 pxamci_disable_irq(pxa_host, SDIO_INT); 541 } 542 543 static const struct mmc_host_ops pxamci_ops = { 544 .request = pxamci_request, 545 .get_cd = mmc_gpio_get_cd, 546 .get_ro = pxamci_get_ro, 547 .set_ios = pxamci_set_ios, 548 .enable_sdio_irq = pxamci_enable_sdio_irq, 549 }; 550 551 static void pxamci_dma_irq(void *param) 552 { 553 struct pxamci_host *host = param; 554 struct dma_tx_state state; 555 enum dma_status status; 556 struct dma_chan *chan; 557 unsigned long flags; 558 559 spin_lock_irqsave(&host->lock, flags); 560 561 if (!host->data) 562 goto out_unlock; 563 564 if (host->data->flags & MMC_DATA_READ) 565 chan = host->dma_chan_rx; 566 else 567 chan = host->dma_chan_tx; 568 569 status = dmaengine_tx_status(chan, host->dma_cookie, &state); 570 571 if (likely(status == DMA_COMPLETE)) { 572 writel(BUF_PART_FULL, host->base + MMC_PRTBUF); 573 } else { 574 pr_err("%s: DMA error on %s channel\n", mmc_hostname(host->mmc), 575 host->data->flags & MMC_DATA_READ ? "rx" : "tx"); 576 host->data->error = -EIO; 577 pxamci_data_done(host, 0); 578 } 579 580 out_unlock: 581 spin_unlock_irqrestore(&host->lock, flags); 582 } 583 584 static irqreturn_t pxamci_detect_irq(int irq, void *devid) 585 { 586 struct pxamci_host *host = mmc_priv(devid); 587 588 mmc_detect_change(devid, msecs_to_jiffies(host->pdata->detect_delay_ms)); 589 return IRQ_HANDLED; 590 } 591 592 #ifdef CONFIG_OF 593 static const struct of_device_id pxa_mmc_dt_ids[] = { 594 { .compatible = "marvell,pxa-mmc" }, 595 { } 596 }; 597 598 MODULE_DEVICE_TABLE(of, pxa_mmc_dt_ids); 599 600 static int pxamci_of_init(struct platform_device *pdev) 601 { 602 struct device_node *np = pdev->dev.of_node; 603 struct pxamci_platform_data *pdata; 604 u32 tmp; 605 606 if (!np) 607 return 0; 608 609 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 610 if (!pdata) 611 return -ENOMEM; 612 613 pdata->gpio_card_detect = 614 of_get_named_gpio(np, "cd-gpios", 0); 615 pdata->gpio_card_ro = 616 of_get_named_gpio(np, "wp-gpios", 0); 617 618 /* pxa-mmc specific */ 619 pdata->gpio_power = 620 of_get_named_gpio(np, "pxa-mmc,gpio-power", 0); 621 622 if (of_property_read_u32(np, "pxa-mmc,detect-delay-ms", &tmp) == 0) 623 pdata->detect_delay_ms = tmp; 624 625 pdev->dev.platform_data = pdata; 626 627 return 0; 628 } 629 #else 630 static int pxamci_of_init(struct platform_device *pdev) 631 { 632 return 0; 633 } 634 #endif 635 636 static int pxamci_probe(struct platform_device *pdev) 637 { 638 struct mmc_host *mmc; 639 struct pxamci_host *host = NULL; 640 struct resource *r, *dmarx, *dmatx; 641 struct pxad_param param_rx, param_tx; 642 int ret, irq, gpio_cd = -1, gpio_ro = -1, gpio_power = -1; 643 dma_cap_mask_t mask; 644 645 ret = pxamci_of_init(pdev); 646 if (ret) 647 return ret; 648 649 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 650 irq = platform_get_irq(pdev, 0); 651 if (irq < 0) 652 return irq; 653 654 mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev); 655 if (!mmc) { 656 ret = -ENOMEM; 657 goto out; 658 } 659 660 mmc->ops = &pxamci_ops; 661 662 /* 663 * We can do SG-DMA, but we don't because we never know how much 664 * data we successfully wrote to the card. 665 */ 666 mmc->max_segs = NR_SG; 667 668 /* 669 * Our hardware DMA can handle a maximum of one page per SG entry. 670 */ 671 mmc->max_seg_size = PAGE_SIZE; 672 673 /* 674 * Block length register is only 10 bits before PXA27x. 675 */ 676 mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048; 677 678 /* 679 * Block count register is 16 bits. 680 */ 681 mmc->max_blk_count = 65535; 682 683 host = mmc_priv(mmc); 684 host->mmc = mmc; 685 host->pdata = pdev->dev.platform_data; 686 host->clkrt = CLKRT_OFF; 687 688 host->clk = devm_clk_get(&pdev->dev, NULL); 689 if (IS_ERR(host->clk)) { 690 ret = PTR_ERR(host->clk); 691 host->clk = NULL; 692 goto out; 693 } 694 695 host->clkrate = clk_get_rate(host->clk); 696 697 /* 698 * Calculate minimum clock rate, rounding up. 699 */ 700 mmc->f_min = (host->clkrate + 63) / 64; 701 mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate; 702 703 pxamci_init_ocr(host); 704 705 mmc->caps = 0; 706 host->cmdat = 0; 707 if (!cpu_is_pxa25x()) { 708 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 709 host->cmdat |= CMDAT_SDIO_INT_EN; 710 if (mmc_has_26MHz()) 711 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | 712 MMC_CAP_SD_HIGHSPEED; 713 } 714 715 spin_lock_init(&host->lock); 716 host->res = r; 717 host->irq = irq; 718 host->imask = MMC_I_MASK_ALL; 719 720 host->base = devm_ioremap_resource(&pdev->dev, r); 721 if (IS_ERR(host->base)) { 722 ret = PTR_ERR(host->base); 723 goto out; 724 } 725 726 /* 727 * Ensure that the host controller is shut down, and setup 728 * with our defaults. 729 */ 730 pxamci_stop_clock(host); 731 writel(0, host->base + MMC_SPI); 732 writel(64, host->base + MMC_RESTO); 733 writel(host->imask, host->base + MMC_I_MASK); 734 735 ret = devm_request_irq(&pdev->dev, host->irq, pxamci_irq, 0, 736 DRIVER_NAME, host); 737 if (ret) 738 goto out; 739 740 platform_set_drvdata(pdev, mmc); 741 742 if (!pdev->dev.of_node) { 743 dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0); 744 dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1); 745 if (!dmarx || !dmatx) { 746 ret = -ENXIO; 747 goto out; 748 } 749 param_rx.prio = PXAD_PRIO_LOWEST; 750 param_rx.drcmr = dmarx->start; 751 param_tx.prio = PXAD_PRIO_LOWEST; 752 param_tx.drcmr = dmatx->start; 753 } 754 755 dma_cap_zero(mask); 756 dma_cap_set(DMA_SLAVE, mask); 757 758 host->dma_chan_rx = 759 dma_request_slave_channel_compat(mask, pxad_filter_fn, 760 ¶m_rx, &pdev->dev, "rx"); 761 if (host->dma_chan_rx == NULL) { 762 dev_err(&pdev->dev, "unable to request rx dma channel\n"); 763 ret = -ENODEV; 764 goto out; 765 } 766 767 host->dma_chan_tx = 768 dma_request_slave_channel_compat(mask, pxad_filter_fn, 769 ¶m_tx, &pdev->dev, "tx"); 770 if (host->dma_chan_tx == NULL) { 771 dev_err(&pdev->dev, "unable to request tx dma channel\n"); 772 ret = -ENODEV; 773 goto out; 774 } 775 776 if (host->pdata) { 777 gpio_cd = host->pdata->gpio_card_detect; 778 gpio_ro = host->pdata->gpio_card_ro; 779 gpio_power = host->pdata->gpio_power; 780 } 781 if (gpio_is_valid(gpio_power)) { 782 ret = devm_gpio_request(&pdev->dev, gpio_power, 783 "mmc card power"); 784 if (ret) { 785 dev_err(&pdev->dev, "Failed requesting gpio_power %d\n", 786 gpio_power); 787 goto out; 788 } 789 gpio_direction_output(gpio_power, 790 host->pdata->gpio_power_invert); 791 } 792 if (gpio_is_valid(gpio_ro)) 793 ret = mmc_gpio_request_ro(mmc, gpio_ro); 794 if (ret) { 795 dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro); 796 goto out; 797 } else { 798 mmc->caps2 |= host->pdata->gpio_card_ro_invert ? 799 0 : MMC_CAP2_RO_ACTIVE_HIGH; 800 } 801 802 if (gpio_is_valid(gpio_cd)) 803 ret = mmc_gpio_request_cd(mmc, gpio_cd, 0); 804 if (ret) { 805 dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_cd); 806 goto out; 807 } 808 809 if (host->pdata && host->pdata->init) 810 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc); 811 812 if (gpio_is_valid(gpio_power) && host->pdata->setpower) 813 dev_warn(&pdev->dev, "gpio_power and setpower() both defined\n"); 814 if (gpio_is_valid(gpio_ro) && host->pdata->get_ro) 815 dev_warn(&pdev->dev, "gpio_ro and get_ro() both defined\n"); 816 817 mmc_add_host(mmc); 818 819 return 0; 820 821 out: 822 if (host) { 823 if (host->dma_chan_rx) 824 dma_release_channel(host->dma_chan_rx); 825 if (host->dma_chan_tx) 826 dma_release_channel(host->dma_chan_tx); 827 } 828 if (mmc) 829 mmc_free_host(mmc); 830 return ret; 831 } 832 833 static int pxamci_remove(struct platform_device *pdev) 834 { 835 struct mmc_host *mmc = platform_get_drvdata(pdev); 836 int gpio_cd = -1, gpio_ro = -1, gpio_power = -1; 837 838 if (mmc) { 839 struct pxamci_host *host = mmc_priv(mmc); 840 841 mmc_remove_host(mmc); 842 843 if (host->pdata) { 844 gpio_cd = host->pdata->gpio_card_detect; 845 gpio_ro = host->pdata->gpio_card_ro; 846 gpio_power = host->pdata->gpio_power; 847 } 848 if (host->pdata && host->pdata->exit) 849 host->pdata->exit(&pdev->dev, mmc); 850 851 pxamci_stop_clock(host); 852 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD| 853 END_CMD_RES|PRG_DONE|DATA_TRAN_DONE, 854 host->base + MMC_I_MASK); 855 856 dmaengine_terminate_all(host->dma_chan_rx); 857 dmaengine_terminate_all(host->dma_chan_tx); 858 dma_release_channel(host->dma_chan_rx); 859 dma_release_channel(host->dma_chan_tx); 860 861 mmc_free_host(mmc); 862 } 863 return 0; 864 } 865 866 static struct platform_driver pxamci_driver = { 867 .probe = pxamci_probe, 868 .remove = pxamci_remove, 869 .driver = { 870 .name = DRIVER_NAME, 871 .of_match_table = of_match_ptr(pxa_mmc_dt_ids), 872 }, 873 }; 874 875 module_platform_driver(pxamci_driver); 876 877 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver"); 878 MODULE_LICENSE("GPL"); 879 MODULE_ALIAS("platform:pxa2xx-mci"); 880