1 /* 2 * MOXA ART MMC host driver. 3 * 4 * Copyright (C) 2014 Jonas Jensen 5 * 6 * Jonas Jensen <jonas.jensen@gmail.com> 7 * 8 * Based on code from 9 * Moxa Technologies Co., Ltd. <www.moxa.com> 10 * 11 * This file is licensed under the terms of the GNU General Public 12 * License version 2. This program is licensed "as is" without any 13 * warranty of any kind, whether express or implied. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/platform_device.h> 19 #include <linux/delay.h> 20 #include <linux/interrupt.h> 21 #include <linux/blkdev.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/dmaengine.h> 24 #include <linux/mmc/host.h> 25 #include <linux/mmc/sd.h> 26 #include <linux/sched.h> 27 #include <linux/io.h> 28 #include <linux/of_address.h> 29 #include <linux/of_irq.h> 30 #include <linux/clk.h> 31 #include <linux/bitops.h> 32 #include <linux/of_dma.h> 33 #include <linux/spinlock.h> 34 35 #define REG_COMMAND 0 36 #define REG_ARGUMENT 4 37 #define REG_RESPONSE0 8 38 #define REG_RESPONSE1 12 39 #define REG_RESPONSE2 16 40 #define REG_RESPONSE3 20 41 #define REG_RESPONSE_COMMAND 24 42 #define REG_DATA_CONTROL 28 43 #define REG_DATA_TIMER 32 44 #define REG_DATA_LENGTH 36 45 #define REG_STATUS 40 46 #define REG_CLEAR 44 47 #define REG_INTERRUPT_MASK 48 48 #define REG_POWER_CONTROL 52 49 #define REG_CLOCK_CONTROL 56 50 #define REG_BUS_WIDTH 60 51 #define REG_DATA_WINDOW 64 52 #define REG_FEATURE 68 53 #define REG_REVISION 72 54 55 /* REG_COMMAND */ 56 #define CMD_SDC_RESET BIT(10) 57 #define CMD_EN BIT(9) 58 #define CMD_APP_CMD BIT(8) 59 #define CMD_LONG_RSP BIT(7) 60 #define CMD_NEED_RSP BIT(6) 61 #define CMD_IDX_MASK 0x3f 62 63 /* REG_RESPONSE_COMMAND */ 64 #define RSP_CMD_APP BIT(6) 65 #define RSP_CMD_IDX_MASK 0x3f 66 67 /* REG_DATA_CONTROL */ 68 #define DCR_DATA_FIFO_RESET BIT(8) 69 #define DCR_DATA_THRES BIT(7) 70 #define DCR_DATA_EN BIT(6) 71 #define DCR_DMA_EN BIT(5) 72 #define DCR_DATA_WRITE BIT(4) 73 #define DCR_BLK_SIZE 0x0f 74 75 /* REG_DATA_LENGTH */ 76 #define DATA_LEN_MASK 0xffffff 77 78 /* REG_STATUS */ 79 #define WRITE_PROT BIT(12) 80 #define CARD_DETECT BIT(11) 81 /* 1-10 below can be sent to either registers, interrupt or clear. */ 82 #define CARD_CHANGE BIT(10) 83 #define FIFO_ORUN BIT(9) 84 #define FIFO_URUN BIT(8) 85 #define DATA_END BIT(7) 86 #define CMD_SENT BIT(6) 87 #define DATA_CRC_OK BIT(5) 88 #define RSP_CRC_OK BIT(4) 89 #define DATA_TIMEOUT BIT(3) 90 #define RSP_TIMEOUT BIT(2) 91 #define DATA_CRC_FAIL BIT(1) 92 #define RSP_CRC_FAIL BIT(0) 93 94 #define MASK_RSP (RSP_TIMEOUT | RSP_CRC_FAIL | \ 95 RSP_CRC_OK | CARD_DETECT | CMD_SENT) 96 97 #define MASK_DATA (DATA_CRC_OK | DATA_END | \ 98 DATA_CRC_FAIL | DATA_TIMEOUT) 99 100 #define MASK_INTR_PIO (FIFO_URUN | FIFO_ORUN | CARD_CHANGE) 101 102 /* REG_POWER_CONTROL */ 103 #define SD_POWER_ON BIT(4) 104 #define SD_POWER_MASK 0x0f 105 106 /* REG_CLOCK_CONTROL */ 107 #define CLK_HISPD BIT(9) 108 #define CLK_OFF BIT(8) 109 #define CLK_SD BIT(7) 110 #define CLK_DIV_MASK 0x7f 111 112 /* REG_BUS_WIDTH */ 113 #define BUS_WIDTH_8 BIT(2) 114 #define BUS_WIDTH_4 BIT(1) 115 #define BUS_WIDTH_1 BIT(0) 116 117 #define MMC_VDD_360 23 118 #define MIN_POWER (MMC_VDD_360 - SD_POWER_MASK) 119 #define MAX_RETRIES 500000 120 121 struct moxart_host { 122 spinlock_t lock; 123 124 void __iomem *base; 125 126 phys_addr_t reg_phys; 127 128 struct dma_chan *dma_chan_tx; 129 struct dma_chan *dma_chan_rx; 130 struct dma_async_tx_descriptor *tx_desc; 131 struct mmc_host *mmc; 132 struct mmc_request *mrq; 133 struct scatterlist *cur_sg; 134 struct completion dma_complete; 135 struct completion pio_complete; 136 137 u32 num_sg; 138 u32 data_remain; 139 u32 data_len; 140 u32 fifo_width; 141 u32 timeout; 142 u32 rate; 143 144 long sysclk; 145 146 bool have_dma; 147 bool is_removed; 148 }; 149 150 static inline void moxart_init_sg(struct moxart_host *host, 151 struct mmc_data *data) 152 { 153 host->cur_sg = data->sg; 154 host->num_sg = data->sg_len; 155 host->data_remain = host->cur_sg->length; 156 157 if (host->data_remain > host->data_len) 158 host->data_remain = host->data_len; 159 } 160 161 static inline int moxart_next_sg(struct moxart_host *host) 162 { 163 int remain; 164 struct mmc_data *data = host->mrq->cmd->data; 165 166 host->cur_sg++; 167 host->num_sg--; 168 169 if (host->num_sg > 0) { 170 host->data_remain = host->cur_sg->length; 171 remain = host->data_len - data->bytes_xfered; 172 if (remain > 0 && remain < host->data_remain) 173 host->data_remain = remain; 174 } 175 176 return host->num_sg; 177 } 178 179 static int moxart_wait_for_status(struct moxart_host *host, 180 u32 mask, u32 *status) 181 { 182 int ret = -ETIMEDOUT; 183 u32 i; 184 185 for (i = 0; i < MAX_RETRIES; i++) { 186 *status = readl(host->base + REG_STATUS); 187 if (!(*status & mask)) { 188 udelay(5); 189 continue; 190 } 191 writel(*status & mask, host->base + REG_CLEAR); 192 ret = 0; 193 break; 194 } 195 196 if (ret) 197 dev_err(mmc_dev(host->mmc), "timed out waiting for status\n"); 198 199 return ret; 200 } 201 202 203 static void moxart_send_command(struct moxart_host *host, 204 struct mmc_command *cmd) 205 { 206 u32 status, cmdctrl; 207 208 writel(RSP_TIMEOUT | RSP_CRC_OK | 209 RSP_CRC_FAIL | CMD_SENT, host->base + REG_CLEAR); 210 writel(cmd->arg, host->base + REG_ARGUMENT); 211 212 cmdctrl = cmd->opcode & CMD_IDX_MASK; 213 if (cmdctrl == SD_APP_SET_BUS_WIDTH || cmdctrl == SD_APP_OP_COND || 214 cmdctrl == SD_APP_SEND_SCR || cmdctrl == SD_APP_SD_STATUS || 215 cmdctrl == SD_APP_SEND_NUM_WR_BLKS) 216 cmdctrl |= CMD_APP_CMD; 217 218 if (cmd->flags & MMC_RSP_PRESENT) 219 cmdctrl |= CMD_NEED_RSP; 220 221 if (cmd->flags & MMC_RSP_136) 222 cmdctrl |= CMD_LONG_RSP; 223 224 writel(cmdctrl | CMD_EN, host->base + REG_COMMAND); 225 226 if (moxart_wait_for_status(host, MASK_RSP, &status) == -ETIMEDOUT) 227 cmd->error = -ETIMEDOUT; 228 229 if (status & RSP_TIMEOUT) { 230 cmd->error = -ETIMEDOUT; 231 return; 232 } 233 if (status & RSP_CRC_FAIL) { 234 cmd->error = -EIO; 235 return; 236 } 237 if (status & RSP_CRC_OK) { 238 if (cmd->flags & MMC_RSP_136) { 239 cmd->resp[3] = readl(host->base + REG_RESPONSE0); 240 cmd->resp[2] = readl(host->base + REG_RESPONSE1); 241 cmd->resp[1] = readl(host->base + REG_RESPONSE2); 242 cmd->resp[0] = readl(host->base + REG_RESPONSE3); 243 } else { 244 cmd->resp[0] = readl(host->base + REG_RESPONSE0); 245 } 246 } 247 } 248 249 static void moxart_dma_complete(void *param) 250 { 251 struct moxart_host *host = param; 252 253 complete(&host->dma_complete); 254 } 255 256 static void moxart_transfer_dma(struct mmc_data *data, struct moxart_host *host) 257 { 258 u32 len, dir_data, dir_slave; 259 unsigned long dma_time; 260 struct dma_async_tx_descriptor *desc = NULL; 261 struct dma_chan *dma_chan; 262 263 if (host->data_len == data->bytes_xfered) 264 return; 265 266 if (data->flags & MMC_DATA_WRITE) { 267 dma_chan = host->dma_chan_tx; 268 dir_data = DMA_TO_DEVICE; 269 dir_slave = DMA_MEM_TO_DEV; 270 } else { 271 dma_chan = host->dma_chan_rx; 272 dir_data = DMA_FROM_DEVICE; 273 dir_slave = DMA_DEV_TO_MEM; 274 } 275 276 len = dma_map_sg(dma_chan->device->dev, data->sg, 277 data->sg_len, dir_data); 278 279 if (len > 0) { 280 desc = dmaengine_prep_slave_sg(dma_chan, data->sg, 281 len, dir_slave, 282 DMA_PREP_INTERRUPT | 283 DMA_CTRL_ACK); 284 } else { 285 dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n"); 286 } 287 288 if (desc) { 289 host->tx_desc = desc; 290 desc->callback = moxart_dma_complete; 291 desc->callback_param = host; 292 dmaengine_submit(desc); 293 dma_async_issue_pending(dma_chan); 294 } 295 296 data->bytes_xfered += host->data_remain; 297 298 dma_time = wait_for_completion_interruptible_timeout( 299 &host->dma_complete, host->timeout); 300 301 dma_unmap_sg(dma_chan->device->dev, 302 data->sg, data->sg_len, 303 dir_data); 304 } 305 306 307 static void moxart_transfer_pio(struct moxart_host *host) 308 { 309 struct mmc_data *data = host->mrq->cmd->data; 310 u32 *sgp, len = 0, remain, status; 311 312 if (host->data_len == data->bytes_xfered) 313 return; 314 315 sgp = sg_virt(host->cur_sg); 316 remain = host->data_remain; 317 318 if (data->flags & MMC_DATA_WRITE) { 319 while (remain > 0) { 320 if (moxart_wait_for_status(host, FIFO_URUN, &status) 321 == -ETIMEDOUT) { 322 data->error = -ETIMEDOUT; 323 complete(&host->pio_complete); 324 return; 325 } 326 for (len = 0; len < remain && len < host->fifo_width;) { 327 iowrite32(*sgp, host->base + REG_DATA_WINDOW); 328 sgp++; 329 len += 4; 330 } 331 remain -= len; 332 } 333 334 } else { 335 while (remain > 0) { 336 if (moxart_wait_for_status(host, FIFO_ORUN, &status) 337 == -ETIMEDOUT) { 338 data->error = -ETIMEDOUT; 339 complete(&host->pio_complete); 340 return; 341 } 342 for (len = 0; len < remain && len < host->fifo_width;) { 343 /* SCR data must be read in big endian. */ 344 if (data->mrq->cmd->opcode == SD_APP_SEND_SCR) 345 *sgp = ioread32be(host->base + 346 REG_DATA_WINDOW); 347 else 348 *sgp = ioread32(host->base + 349 REG_DATA_WINDOW); 350 sgp++; 351 len += 4; 352 } 353 remain -= len; 354 } 355 } 356 357 data->bytes_xfered += host->data_remain - remain; 358 host->data_remain = remain; 359 360 if (host->data_len != data->bytes_xfered) 361 moxart_next_sg(host); 362 else 363 complete(&host->pio_complete); 364 } 365 366 static void moxart_prepare_data(struct moxart_host *host) 367 { 368 struct mmc_data *data = host->mrq->cmd->data; 369 u32 datactrl; 370 int blksz_bits; 371 372 if (!data) 373 return; 374 375 host->data_len = data->blocks * data->blksz; 376 blksz_bits = ffs(data->blksz) - 1; 377 BUG_ON(1 << blksz_bits != data->blksz); 378 379 moxart_init_sg(host, data); 380 381 datactrl = DCR_DATA_EN | (blksz_bits & DCR_BLK_SIZE); 382 383 if (data->flags & MMC_DATA_WRITE) 384 datactrl |= DCR_DATA_WRITE; 385 386 if ((host->data_len > host->fifo_width) && host->have_dma) 387 datactrl |= DCR_DMA_EN; 388 389 writel(DCR_DATA_FIFO_RESET, host->base + REG_DATA_CONTROL); 390 writel(MASK_DATA | FIFO_URUN | FIFO_ORUN, host->base + REG_CLEAR); 391 writel(host->rate, host->base + REG_DATA_TIMER); 392 writel(host->data_len, host->base + REG_DATA_LENGTH); 393 writel(datactrl, host->base + REG_DATA_CONTROL); 394 } 395 396 static void moxart_request(struct mmc_host *mmc, struct mmc_request *mrq) 397 { 398 struct moxart_host *host = mmc_priv(mmc); 399 unsigned long pio_time, flags; 400 u32 status; 401 402 spin_lock_irqsave(&host->lock, flags); 403 404 init_completion(&host->dma_complete); 405 init_completion(&host->pio_complete); 406 407 host->mrq = mrq; 408 409 if (readl(host->base + REG_STATUS) & CARD_DETECT) { 410 mrq->cmd->error = -ETIMEDOUT; 411 goto request_done; 412 } 413 414 moxart_prepare_data(host); 415 moxart_send_command(host, host->mrq->cmd); 416 417 if (mrq->cmd->data) { 418 if ((host->data_len > host->fifo_width) && host->have_dma) { 419 420 writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK); 421 422 spin_unlock_irqrestore(&host->lock, flags); 423 424 moxart_transfer_dma(mrq->cmd->data, host); 425 426 spin_lock_irqsave(&host->lock, flags); 427 } else { 428 429 writel(MASK_INTR_PIO, host->base + REG_INTERRUPT_MASK); 430 431 spin_unlock_irqrestore(&host->lock, flags); 432 433 /* PIO transfers start from interrupt. */ 434 pio_time = wait_for_completion_interruptible_timeout( 435 &host->pio_complete, host->timeout); 436 437 spin_lock_irqsave(&host->lock, flags); 438 } 439 440 if (host->is_removed) { 441 dev_err(mmc_dev(host->mmc), "card removed\n"); 442 mrq->cmd->error = -ETIMEDOUT; 443 goto request_done; 444 } 445 446 if (moxart_wait_for_status(host, MASK_DATA, &status) 447 == -ETIMEDOUT) { 448 mrq->cmd->data->error = -ETIMEDOUT; 449 goto request_done; 450 } 451 452 if (status & DATA_CRC_FAIL) 453 mrq->cmd->data->error = -ETIMEDOUT; 454 455 if (mrq->cmd->data->stop) 456 moxart_send_command(host, mrq->cmd->data->stop); 457 } 458 459 request_done: 460 spin_unlock_irqrestore(&host->lock, flags); 461 mmc_request_done(host->mmc, mrq); 462 } 463 464 static irqreturn_t moxart_irq(int irq, void *devid) 465 { 466 struct moxart_host *host = (struct moxart_host *)devid; 467 u32 status; 468 unsigned long flags; 469 470 spin_lock_irqsave(&host->lock, flags); 471 472 status = readl(host->base + REG_STATUS); 473 if (status & CARD_CHANGE) { 474 host->is_removed = status & CARD_DETECT; 475 if (host->is_removed && host->have_dma) { 476 dmaengine_terminate_all(host->dma_chan_tx); 477 dmaengine_terminate_all(host->dma_chan_rx); 478 } 479 host->mrq = NULL; 480 writel(MASK_INTR_PIO, host->base + REG_CLEAR); 481 writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK); 482 mmc_detect_change(host->mmc, 0); 483 } 484 if (status & (FIFO_ORUN | FIFO_URUN) && host->mrq) 485 moxart_transfer_pio(host); 486 487 spin_unlock_irqrestore(&host->lock, flags); 488 489 return IRQ_HANDLED; 490 } 491 492 static void moxart_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 493 { 494 struct moxart_host *host = mmc_priv(mmc); 495 unsigned long flags; 496 u8 power, div; 497 u32 ctrl; 498 499 spin_lock_irqsave(&host->lock, flags); 500 501 if (ios->clock) { 502 for (div = 0; div < CLK_DIV_MASK; ++div) { 503 if (ios->clock >= host->sysclk / (2 * (div + 1))) 504 break; 505 } 506 ctrl = CLK_SD | div; 507 host->rate = host->sysclk / (2 * (div + 1)); 508 if (host->rate > host->sysclk) 509 ctrl |= CLK_HISPD; 510 writel(ctrl, host->base + REG_CLOCK_CONTROL); 511 } 512 513 if (ios->power_mode == MMC_POWER_OFF) { 514 writel(readl(host->base + REG_POWER_CONTROL) & ~SD_POWER_ON, 515 host->base + REG_POWER_CONTROL); 516 } else { 517 if (ios->vdd < MIN_POWER) 518 power = 0; 519 else 520 power = ios->vdd - MIN_POWER; 521 522 writel(SD_POWER_ON | (u32) power, 523 host->base + REG_POWER_CONTROL); 524 } 525 526 switch (ios->bus_width) { 527 case MMC_BUS_WIDTH_4: 528 writel(BUS_WIDTH_4, host->base + REG_BUS_WIDTH); 529 break; 530 case MMC_BUS_WIDTH_8: 531 writel(BUS_WIDTH_8, host->base + REG_BUS_WIDTH); 532 break; 533 default: 534 writel(BUS_WIDTH_1, host->base + REG_BUS_WIDTH); 535 break; 536 } 537 538 spin_unlock_irqrestore(&host->lock, flags); 539 } 540 541 542 static int moxart_get_ro(struct mmc_host *mmc) 543 { 544 struct moxart_host *host = mmc_priv(mmc); 545 546 return !!(readl(host->base + REG_STATUS) & WRITE_PROT); 547 } 548 549 static struct mmc_host_ops moxart_ops = { 550 .request = moxart_request, 551 .set_ios = moxart_set_ios, 552 .get_ro = moxart_get_ro, 553 }; 554 555 static int moxart_probe(struct platform_device *pdev) 556 { 557 struct device *dev = &pdev->dev; 558 struct device_node *node = dev->of_node; 559 struct resource res_mmc; 560 struct mmc_host *mmc; 561 struct moxart_host *host = NULL; 562 struct dma_slave_config cfg; 563 struct clk *clk; 564 void __iomem *reg_mmc; 565 dma_cap_mask_t mask; 566 int irq, ret; 567 u32 i; 568 569 mmc = mmc_alloc_host(sizeof(struct moxart_host), dev); 570 if (!mmc) { 571 dev_err(dev, "mmc_alloc_host failed\n"); 572 ret = -ENOMEM; 573 goto out; 574 } 575 576 ret = of_address_to_resource(node, 0, &res_mmc); 577 if (ret) { 578 dev_err(dev, "of_address_to_resource failed\n"); 579 goto out; 580 } 581 582 irq = irq_of_parse_and_map(node, 0); 583 if (irq <= 0) { 584 dev_err(dev, "irq_of_parse_and_map failed\n"); 585 ret = -EINVAL; 586 goto out; 587 } 588 589 clk = of_clk_get(node, 0); 590 if (IS_ERR(clk)) { 591 dev_err(dev, "of_clk_get failed\n"); 592 ret = PTR_ERR(clk); 593 goto out; 594 } 595 596 reg_mmc = devm_ioremap_resource(dev, &res_mmc); 597 if (IS_ERR(reg_mmc)) { 598 ret = PTR_ERR(reg_mmc); 599 goto out; 600 } 601 602 mmc_of_parse(mmc); 603 604 dma_cap_zero(mask); 605 dma_cap_set(DMA_SLAVE, mask); 606 607 host = mmc_priv(mmc); 608 host->mmc = mmc; 609 host->base = reg_mmc; 610 host->reg_phys = res_mmc.start; 611 host->timeout = msecs_to_jiffies(1000); 612 host->sysclk = clk_get_rate(clk); 613 host->fifo_width = readl(host->base + REG_FEATURE) << 2; 614 host->dma_chan_tx = of_dma_request_slave_channel(node, "tx"); 615 host->dma_chan_rx = of_dma_request_slave_channel(node, "rx"); 616 617 spin_lock_init(&host->lock); 618 619 mmc->ops = &moxart_ops; 620 mmc->f_max = DIV_ROUND_CLOSEST(host->sysclk, 2); 621 mmc->f_min = DIV_ROUND_CLOSEST(host->sysclk, CLK_DIV_MASK * 2); 622 mmc->ocr_avail = 0xffff00; /* Support 2.0v - 3.6v power. */ 623 624 if (IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) { 625 dev_dbg(dev, "PIO mode transfer enabled\n"); 626 host->have_dma = false; 627 } else { 628 dev_dbg(dev, "DMA channels found (%p,%p)\n", 629 host->dma_chan_tx, host->dma_chan_rx); 630 host->have_dma = true; 631 632 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 633 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 634 635 cfg.direction = DMA_MEM_TO_DEV; 636 cfg.src_addr = 0; 637 cfg.dst_addr = host->reg_phys + REG_DATA_WINDOW; 638 dmaengine_slave_config(host->dma_chan_tx, &cfg); 639 640 cfg.direction = DMA_DEV_TO_MEM; 641 cfg.src_addr = host->reg_phys + REG_DATA_WINDOW; 642 cfg.dst_addr = 0; 643 dmaengine_slave_config(host->dma_chan_rx, &cfg); 644 } 645 646 switch ((readl(host->base + REG_BUS_WIDTH) >> 3) & 3) { 647 case 1: 648 mmc->caps |= MMC_CAP_4_BIT_DATA; 649 break; 650 case 2: 651 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; 652 break; 653 default: 654 break; 655 } 656 657 writel(0, host->base + REG_INTERRUPT_MASK); 658 659 writel(CMD_SDC_RESET, host->base + REG_COMMAND); 660 for (i = 0; i < MAX_RETRIES; i++) { 661 if (!(readl(host->base + REG_COMMAND) & CMD_SDC_RESET)) 662 break; 663 udelay(5); 664 } 665 666 ret = devm_request_irq(dev, irq, moxart_irq, 0, "moxart-mmc", host); 667 if (ret) 668 goto out; 669 670 dev_set_drvdata(dev, mmc); 671 mmc_add_host(mmc); 672 673 dev_dbg(dev, "IRQ=%d, FIFO is %d bytes\n", irq, host->fifo_width); 674 675 return 0; 676 677 out: 678 if (mmc) 679 mmc_free_host(mmc); 680 return ret; 681 } 682 683 static int moxart_remove(struct platform_device *pdev) 684 { 685 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev); 686 struct moxart_host *host = mmc_priv(mmc); 687 688 dev_set_drvdata(&pdev->dev, NULL); 689 690 if (mmc) { 691 if (!IS_ERR(host->dma_chan_tx)) 692 dma_release_channel(host->dma_chan_tx); 693 if (!IS_ERR(host->dma_chan_rx)) 694 dma_release_channel(host->dma_chan_rx); 695 mmc_remove_host(mmc); 696 mmc_free_host(mmc); 697 698 writel(0, host->base + REG_INTERRUPT_MASK); 699 writel(0, host->base + REG_POWER_CONTROL); 700 writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF, 701 host->base + REG_CLOCK_CONTROL); 702 } 703 704 kfree(host); 705 706 return 0; 707 } 708 709 static const struct of_device_id moxart_mmc_match[] = { 710 { .compatible = "moxa,moxart-mmc" }, 711 { .compatible = "faraday,ftsdc010" }, 712 { } 713 }; 714 715 static struct platform_driver moxart_mmc_driver = { 716 .probe = moxart_probe, 717 .remove = moxart_remove, 718 .driver = { 719 .name = "mmc-moxart", 720 .of_match_table = moxart_mmc_match, 721 }, 722 }; 723 module_platform_driver(moxart_mmc_driver); 724 725 MODULE_ALIAS("platform:mmc-moxart"); 726 MODULE_DESCRIPTION("MOXA ART MMC driver"); 727 MODULE_LICENSE("GPL v2"); 728 MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); 729