1/* 2 * Portions copyright (C) 2003 Russell King, PXA MMCI Driver 3 * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver 4 * 5 * Copyright 2008 Embedded Alley Solutions, Inc. 6 * Copyright 2009-2011 Freescale Semiconductor, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 21 */ 22 23#include <linux/kernel.h> 24#include <linux/init.h> 25#include <linux/ioport.h> 26#include <linux/of.h> 27#include <linux/of_device.h> 28#include <linux/of_gpio.h> 29#include <linux/platform_device.h> 30#include <linux/delay.h> 31#include <linux/interrupt.h> 32#include <linux/dma-mapping.h> 33#include <linux/dmaengine.h> 34#include <linux/highmem.h> 35#include <linux/clk.h> 36#include <linux/err.h> 37#include <linux/completion.h> 38#include <linux/mmc/host.h> 39#include <linux/mmc/mmc.h> 40#include <linux/mmc/sdio.h> 41#include <linux/mmc/slot-gpio.h> 42#include <linux/gpio.h> 43#include <linux/regulator/consumer.h> 44#include <linux/module.h> 45#include <linux/stmp_device.h> 46#include <linux/spi/mxs-spi.h> 47 48#define DRIVER_NAME "mxs-mmc" 49 50#define MXS_MMC_IRQ_BITS (BM_SSP_CTRL1_SDIO_IRQ | \ 51 BM_SSP_CTRL1_RESP_ERR_IRQ | \ 52 BM_SSP_CTRL1_RESP_TIMEOUT_IRQ | \ 53 BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | \ 54 BM_SSP_CTRL1_DATA_CRC_IRQ | \ 55 BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | \ 56 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ | \ 57 BM_SSP_CTRL1_FIFO_OVERRUN_IRQ) 58 59/* card detect polling timeout */ 60#define MXS_MMC_DETECT_TIMEOUT (HZ/2) 61 62struct mxs_mmc_host { 63 struct mxs_ssp ssp; 64 65 struct mmc_host *mmc; 66 struct mmc_request *mrq; 67 struct mmc_command *cmd; 68 struct mmc_data *data; 69 70 unsigned char bus_width; 71 spinlock_t lock; 72 int sdio_irq_en; 73 bool broken_cd; 74}; 75 76static int mxs_mmc_get_cd(struct mmc_host *mmc) 77{ 78 struct mxs_mmc_host *host = mmc_priv(mmc); 79 struct mxs_ssp *ssp = &host->ssp; 80 int present, ret; 81 82 if (host->broken_cd) 83 return -ENOSYS; 84 85 ret = mmc_gpio_get_cd(mmc); 86 if (ret >= 0) 87 return ret; 88 89 present = mmc->caps & MMC_CAP_NEEDS_POLL || 90 !(readl(ssp->base + HW_SSP_STATUS(ssp)) & 91 BM_SSP_STATUS_CARD_DETECT); 92 93 if (mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH) 94 present = !present; 95 96 return present; 97} 98 99static int mxs_mmc_reset(struct mxs_mmc_host *host) 100{ 101 struct mxs_ssp *ssp = &host->ssp; 102 u32 ctrl0, ctrl1; 103 int ret; 104 105 ret = stmp_reset_block(ssp->base); 106 if (ret) 107 return ret; 108 109 ctrl0 = BM_SSP_CTRL0_IGNORE_CRC; 110 ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) | 111 BF_SSP(0x7, CTRL1_WORD_LENGTH) | 112 BM_SSP_CTRL1_DMA_ENABLE | 113 BM_SSP_CTRL1_POLARITY | 114 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN | 115 BM_SSP_CTRL1_DATA_CRC_IRQ_EN | 116 BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN | 117 BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN | 118 BM_SSP_CTRL1_RESP_ERR_IRQ_EN; 119 120 writel(BF_SSP(0xffff, TIMING_TIMEOUT) | 121 BF_SSP(2, TIMING_CLOCK_DIVIDE) | 122 BF_SSP(0, TIMING_CLOCK_RATE), 123 ssp->base + HW_SSP_TIMING(ssp)); 124 125 if (host->sdio_irq_en) { 126 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; 127 ctrl1 |= BM_SSP_CTRL1_SDIO_IRQ_EN; 128 } 129 130 writel(ctrl0, ssp->base + HW_SSP_CTRL0); 131 writel(ctrl1, ssp->base + HW_SSP_CTRL1(ssp)); 132 return 0; 133} 134 135static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, 136 struct mmc_command *cmd); 137 138static void mxs_mmc_request_done(struct mxs_mmc_host *host) 139{ 140 struct mmc_command *cmd = host->cmd; 141 struct mmc_data *data = host->data; 142 struct mmc_request *mrq = host->mrq; 143 struct mxs_ssp *ssp = &host->ssp; 144 145 if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) { 146 if (mmc_resp_type(cmd) & MMC_RSP_136) { 147 cmd->resp[3] = readl(ssp->base + HW_SSP_SDRESP0(ssp)); 148 cmd->resp[2] = readl(ssp->base + HW_SSP_SDRESP1(ssp)); 149 cmd->resp[1] = readl(ssp->base + HW_SSP_SDRESP2(ssp)); 150 cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP3(ssp)); 151 } else { 152 cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP0(ssp)); 153 } 154 } 155 156 if (data) { 157 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 158 data->sg_len, ssp->dma_dir); 159 /* 160 * If there was an error on any block, we mark all 161 * data blocks as being in error. 162 */ 163 if (!data->error) 164 data->bytes_xfered = data->blocks * data->blksz; 165 else 166 data->bytes_xfered = 0; 167 168 host->data = NULL; 169 if (mrq->stop) { 170 mxs_mmc_start_cmd(host, mrq->stop); 171 return; 172 } 173 } 174 175 host->mrq = NULL; 176 mmc_request_done(host->mmc, mrq); 177} 178 179static void mxs_mmc_dma_irq_callback(void *param) 180{ 181 struct mxs_mmc_host *host = param; 182 183 mxs_mmc_request_done(host); 184} 185 186static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id) 187{ 188 struct mxs_mmc_host *host = dev_id; 189 struct mmc_command *cmd = host->cmd; 190 struct mmc_data *data = host->data; 191 struct mxs_ssp *ssp = &host->ssp; 192 u32 stat; 193 194 spin_lock(&host->lock); 195 196 stat = readl(ssp->base + HW_SSP_CTRL1(ssp)); 197 writel(stat & MXS_MMC_IRQ_BITS, 198 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR); 199 200 spin_unlock(&host->lock); 201 202 if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN)) 203 mmc_signal_sdio_irq(host->mmc); 204 205 if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ) 206 cmd->error = -ETIMEDOUT; 207 else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ) 208 cmd->error = -EIO; 209 210 if (data) { 211 if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | 212 BM_SSP_CTRL1_RECV_TIMEOUT_IRQ)) 213 data->error = -ETIMEDOUT; 214 else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ) 215 data->error = -EILSEQ; 216 else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | 217 BM_SSP_CTRL1_FIFO_OVERRUN_IRQ)) 218 data->error = -EIO; 219 } 220 221 return IRQ_HANDLED; 222} 223 224static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( 225 struct mxs_mmc_host *host, unsigned long flags) 226{ 227 struct mxs_ssp *ssp = &host->ssp; 228 struct dma_async_tx_descriptor *desc; 229 struct mmc_data *data = host->data; 230 struct scatterlist * sgl; 231 unsigned int sg_len; 232 233 if (data) { 234 /* data */ 235 dma_map_sg(mmc_dev(host->mmc), data->sg, 236 data->sg_len, ssp->dma_dir); 237 sgl = data->sg; 238 sg_len = data->sg_len; 239 } else { 240 /* pio */ 241 sgl = (struct scatterlist *) ssp->ssp_pio_words; 242 sg_len = SSP_PIO_NUM; 243 } 244 245 desc = dmaengine_prep_slave_sg(ssp->dmach, 246 sgl, sg_len, ssp->slave_dirn, flags); 247 if (desc) { 248 desc->callback = mxs_mmc_dma_irq_callback; 249 desc->callback_param = host; 250 } else { 251 if (data) 252 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 253 data->sg_len, ssp->dma_dir); 254 } 255 256 return desc; 257} 258 259static void mxs_mmc_bc(struct mxs_mmc_host *host) 260{ 261 struct mxs_ssp *ssp = &host->ssp; 262 struct mmc_command *cmd = host->cmd; 263 struct dma_async_tx_descriptor *desc; 264 u32 ctrl0, cmd0, cmd1; 265 266 ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC; 267 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC; 268 cmd1 = cmd->arg; 269 270 if (host->sdio_irq_en) { 271 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; 272 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; 273 } 274 275 ssp->ssp_pio_words[0] = ctrl0; 276 ssp->ssp_pio_words[1] = cmd0; 277 ssp->ssp_pio_words[2] = cmd1; 278 ssp->dma_dir = DMA_NONE; 279 ssp->slave_dirn = DMA_TRANS_NONE; 280 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK); 281 if (!desc) 282 goto out; 283 284 dmaengine_submit(desc); 285 dma_async_issue_pending(ssp->dmach); 286 return; 287 288out: 289 dev_warn(mmc_dev(host->mmc), 290 "%s: failed to prep dma\n", __func__); 291} 292 293static void mxs_mmc_ac(struct mxs_mmc_host *host) 294{ 295 struct mxs_ssp *ssp = &host->ssp; 296 struct mmc_command *cmd = host->cmd; 297 struct dma_async_tx_descriptor *desc; 298 u32 ignore_crc, get_resp, long_resp; 299 u32 ctrl0, cmd0, cmd1; 300 301 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? 302 0 : BM_SSP_CTRL0_IGNORE_CRC; 303 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? 304 BM_SSP_CTRL0_GET_RESP : 0; 305 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? 306 BM_SSP_CTRL0_LONG_RESP : 0; 307 308 ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp; 309 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); 310 cmd1 = cmd->arg; 311 312 if (host->sdio_irq_en) { 313 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; 314 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; 315 } 316 317 ssp->ssp_pio_words[0] = ctrl0; 318 ssp->ssp_pio_words[1] = cmd0; 319 ssp->ssp_pio_words[2] = cmd1; 320 ssp->dma_dir = DMA_NONE; 321 ssp->slave_dirn = DMA_TRANS_NONE; 322 desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK); 323 if (!desc) 324 goto out; 325 326 dmaengine_submit(desc); 327 dma_async_issue_pending(ssp->dmach); 328 return; 329 330out: 331 dev_warn(mmc_dev(host->mmc), 332 "%s: failed to prep dma\n", __func__); 333} 334 335static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns) 336{ 337 const unsigned int ssp_timeout_mul = 4096; 338 /* 339 * Calculate ticks in ms since ns are large numbers 340 * and might overflow 341 */ 342 const unsigned int clock_per_ms = clock_rate / 1000; 343 const unsigned int ms = ns / 1000; 344 const unsigned int ticks = ms * clock_per_ms; 345 const unsigned int ssp_ticks = ticks / ssp_timeout_mul; 346 347 WARN_ON(ssp_ticks == 0); 348 return ssp_ticks; 349} 350 351static void mxs_mmc_adtc(struct mxs_mmc_host *host) 352{ 353 struct mmc_command *cmd = host->cmd; 354 struct mmc_data *data = cmd->data; 355 struct dma_async_tx_descriptor *desc; 356 struct scatterlist *sgl = data->sg, *sg; 357 unsigned int sg_len = data->sg_len; 358 unsigned int i; 359 360 unsigned short dma_data_dir, timeout; 361 enum dma_transfer_direction slave_dirn; 362 unsigned int data_size = 0, log2_blksz; 363 unsigned int blocks = data->blocks; 364 365 struct mxs_ssp *ssp = &host->ssp; 366 367 u32 ignore_crc, get_resp, long_resp, read; 368 u32 ctrl0, cmd0, cmd1, val; 369 370 ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? 371 0 : BM_SSP_CTRL0_IGNORE_CRC; 372 get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? 373 BM_SSP_CTRL0_GET_RESP : 0; 374 long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? 375 BM_SSP_CTRL0_LONG_RESP : 0; 376 377 if (data->flags & MMC_DATA_WRITE) { 378 dma_data_dir = DMA_TO_DEVICE; 379 slave_dirn = DMA_MEM_TO_DEV; 380 read = 0; 381 } else { 382 dma_data_dir = DMA_FROM_DEVICE; 383 slave_dirn = DMA_DEV_TO_MEM; 384 read = BM_SSP_CTRL0_READ; 385 } 386 387 ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) | 388 ignore_crc | get_resp | long_resp | 389 BM_SSP_CTRL0_DATA_XFER | read | 390 BM_SSP_CTRL0_WAIT_FOR_IRQ | 391 BM_SSP_CTRL0_ENABLE; 392 393 cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); 394 395 /* get logarithm to base 2 of block size for setting register */ 396 log2_blksz = ilog2(data->blksz); 397 398 /* 399 * take special care of the case that data size from data->sg 400 * is not equal to blocks x blksz 401 */ 402 for_each_sg(sgl, sg, sg_len, i) 403 data_size += sg->length; 404 405 if (data_size != data->blocks * data->blksz) 406 blocks = 1; 407 408 /* xfer count, block size and count need to be set differently */ 409 if (ssp_is_old(ssp)) { 410 ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT); 411 cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) | 412 BF_SSP(blocks - 1, CMD0_BLOCK_COUNT); 413 } else { 414 writel(data_size, ssp->base + HW_SSP_XFER_SIZE); 415 writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) | 416 BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT), 417 ssp->base + HW_SSP_BLOCK_SIZE); 418 } 419 420 if ((cmd->opcode == MMC_STOP_TRANSMISSION) || 421 (cmd->opcode == SD_IO_RW_EXTENDED)) 422 cmd0 |= BM_SSP_CMD0_APPEND_8CYC; 423 424 cmd1 = cmd->arg; 425 426 if (host->sdio_irq_en) { 427 ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; 428 cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; 429 } 430 431 /* set the timeout count */ 432 timeout = mxs_ns_to_ssp_ticks(ssp->clk_rate, data->timeout_ns); 433 val = readl(ssp->base + HW_SSP_TIMING(ssp)); 434 val &= ~(BM_SSP_TIMING_TIMEOUT); 435 val |= BF_SSP(timeout, TIMING_TIMEOUT); 436 writel(val, ssp->base + HW_SSP_TIMING(ssp)); 437 438 /* pio */ 439 ssp->ssp_pio_words[0] = ctrl0; 440 ssp->ssp_pio_words[1] = cmd0; 441 ssp->ssp_pio_words[2] = cmd1; 442 ssp->dma_dir = DMA_NONE; 443 ssp->slave_dirn = DMA_TRANS_NONE; 444 desc = mxs_mmc_prep_dma(host, 0); 445 if (!desc) 446 goto out; 447 448 /* append data sg */ 449 WARN_ON(host->data != NULL); 450 host->data = data; 451 ssp->dma_dir = dma_data_dir; 452 ssp->slave_dirn = slave_dirn; 453 desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 454 if (!desc) 455 goto out; 456 457 dmaengine_submit(desc); 458 dma_async_issue_pending(ssp->dmach); 459 return; 460out: 461 dev_warn(mmc_dev(host->mmc), 462 "%s: failed to prep dma\n", __func__); 463} 464 465static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, 466 struct mmc_command *cmd) 467{ 468 host->cmd = cmd; 469 470 switch (mmc_cmd_type(cmd)) { 471 case MMC_CMD_BC: 472 mxs_mmc_bc(host); 473 break; 474 case MMC_CMD_BCR: 475 mxs_mmc_ac(host); 476 break; 477 case MMC_CMD_AC: 478 mxs_mmc_ac(host); 479 break; 480 case MMC_CMD_ADTC: 481 mxs_mmc_adtc(host); 482 break; 483 default: 484 dev_warn(mmc_dev(host->mmc), 485 "%s: unknown MMC command\n", __func__); 486 break; 487 } 488} 489 490static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 491{ 492 struct mxs_mmc_host *host = mmc_priv(mmc); 493 494 WARN_ON(host->mrq != NULL); 495 host->mrq = mrq; 496 mxs_mmc_start_cmd(host, mrq->cmd); 497} 498 499static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 500{ 501 struct mxs_mmc_host *host = mmc_priv(mmc); 502 503 if (ios->bus_width == MMC_BUS_WIDTH_8) 504 host->bus_width = 2; 505 else if (ios->bus_width == MMC_BUS_WIDTH_4) 506 host->bus_width = 1; 507 else 508 host->bus_width = 0; 509 510 if (ios->clock) 511 mxs_ssp_set_clk_rate(&host->ssp, ios->clock); 512} 513 514static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) 515{ 516 struct mxs_mmc_host *host = mmc_priv(mmc); 517 struct mxs_ssp *ssp = &host->ssp; 518 unsigned long flags; 519 520 spin_lock_irqsave(&host->lock, flags); 521 522 host->sdio_irq_en = enable; 523 524 if (enable) { 525 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, 526 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); 527 writel(BM_SSP_CTRL1_SDIO_IRQ_EN, 528 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_SET); 529 } else { 530 writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, 531 ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR); 532 writel(BM_SSP_CTRL1_SDIO_IRQ_EN, 533 ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR); 534 } 535 536 spin_unlock_irqrestore(&host->lock, flags); 537 538 if (enable && readl(ssp->base + HW_SSP_STATUS(ssp)) & 539 BM_SSP_STATUS_SDIO_IRQ) 540 mmc_signal_sdio_irq(host->mmc); 541 542} 543 544static const struct mmc_host_ops mxs_mmc_ops = { 545 .request = mxs_mmc_request, 546 .get_ro = mmc_gpio_get_ro, 547 .get_cd = mxs_mmc_get_cd, 548 .set_ios = mxs_mmc_set_ios, 549 .enable_sdio_irq = mxs_mmc_enable_sdio_irq, 550}; 551 552static struct platform_device_id mxs_ssp_ids[] = { 553 { 554 .name = "imx23-mmc", 555 .driver_data = IMX23_SSP, 556 }, { 557 .name = "imx28-mmc", 558 .driver_data = IMX28_SSP, 559 }, { 560 /* sentinel */ 561 } 562}; 563MODULE_DEVICE_TABLE(platform, mxs_ssp_ids); 564 565static const struct of_device_id mxs_mmc_dt_ids[] = { 566 { .compatible = "fsl,imx23-mmc", .data = (void *) IMX23_SSP, }, 567 { .compatible = "fsl,imx28-mmc", .data = (void *) IMX28_SSP, }, 568 { /* sentinel */ } 569}; 570MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids); 571 572static int mxs_mmc_probe(struct platform_device *pdev) 573{ 574 const struct of_device_id *of_id = 575 of_match_device(mxs_mmc_dt_ids, &pdev->dev); 576 struct device_node *np = pdev->dev.of_node; 577 struct mxs_mmc_host *host; 578 struct mmc_host *mmc; 579 struct resource *iores; 580 int ret = 0, irq_err; 581 struct regulator *reg_vmmc; 582 struct mxs_ssp *ssp; 583 584 irq_err = platform_get_irq(pdev, 0); 585 if (irq_err < 0) 586 return irq_err; 587 588 mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev); 589 if (!mmc) 590 return -ENOMEM; 591 592 host = mmc_priv(mmc); 593 ssp = &host->ssp; 594 ssp->dev = &pdev->dev; 595 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 596 ssp->base = devm_ioremap_resource(&pdev->dev, iores); 597 if (IS_ERR(ssp->base)) { 598 ret = PTR_ERR(ssp->base); 599 goto out_mmc_free; 600 } 601 602 ssp->devid = (enum mxs_ssp_id) of_id->data; 603 604 host->mmc = mmc; 605 host->sdio_irq_en = 0; 606 607 reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc"); 608 if (!IS_ERR(reg_vmmc)) { 609 ret = regulator_enable(reg_vmmc); 610 if (ret) { 611 dev_err(&pdev->dev, 612 "Failed to enable vmmc regulator: %d\n", ret); 613 goto out_mmc_free; 614 } 615 } 616 617 ssp->clk = devm_clk_get(&pdev->dev, NULL); 618 if (IS_ERR(ssp->clk)) { 619 ret = PTR_ERR(ssp->clk); 620 goto out_mmc_free; 621 } 622 ret = clk_prepare_enable(ssp->clk); 623 if (ret) 624 goto out_mmc_free; 625 626 ret = mxs_mmc_reset(host); 627 if (ret) { 628 dev_err(&pdev->dev, "Failed to reset mmc: %d\n", ret); 629 goto out_clk_disable; 630 } 631 632 ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx"); 633 if (!ssp->dmach) { 634 dev_err(mmc_dev(host->mmc), 635 "%s: failed to request dma\n", __func__); 636 ret = -ENODEV; 637 goto out_clk_disable; 638 } 639 640 /* set mmc core parameters */ 641 mmc->ops = &mxs_mmc_ops; 642 mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | 643 MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL; 644 645 host->broken_cd = of_property_read_bool(np, "broken-cd"); 646 647 mmc->f_min = 400000; 648 mmc->f_max = 288000000; 649 650 ret = mmc_of_parse(mmc); 651 if (ret) 652 goto out_clk_disable; 653 654 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 655 656 mmc->max_segs = 52; 657 mmc->max_blk_size = 1 << 0xf; 658 mmc->max_blk_count = (ssp_is_old(ssp)) ? 0xff : 0xffffff; 659 mmc->max_req_size = (ssp_is_old(ssp)) ? 0xffff : 0xffffffff; 660 mmc->max_seg_size = dma_get_max_seg_size(ssp->dmach->device->dev); 661 662 platform_set_drvdata(pdev, mmc); 663 664 ret = devm_request_irq(&pdev->dev, irq_err, mxs_mmc_irq_handler, 0, 665 dev_name(&pdev->dev), host); 666 if (ret) 667 goto out_free_dma; 668 669 spin_lock_init(&host->lock); 670 671 ret = mmc_add_host(mmc); 672 if (ret) 673 goto out_free_dma; 674 675 dev_info(mmc_dev(host->mmc), "initialized\n"); 676 677 return 0; 678 679out_free_dma: 680 dma_release_channel(ssp->dmach); 681out_clk_disable: 682 clk_disable_unprepare(ssp->clk); 683out_mmc_free: 684 mmc_free_host(mmc); 685 return ret; 686} 687 688static int mxs_mmc_remove(struct platform_device *pdev) 689{ 690 struct mmc_host *mmc = platform_get_drvdata(pdev); 691 struct mxs_mmc_host *host = mmc_priv(mmc); 692 struct mxs_ssp *ssp = &host->ssp; 693 694 mmc_remove_host(mmc); 695 696 if (ssp->dmach) 697 dma_release_channel(ssp->dmach); 698 699 clk_disable_unprepare(ssp->clk); 700 701 mmc_free_host(mmc); 702 703 return 0; 704} 705 706#ifdef CONFIG_PM_SLEEP 707static int mxs_mmc_suspend(struct device *dev) 708{ 709 struct mmc_host *mmc = dev_get_drvdata(dev); 710 struct mxs_mmc_host *host = mmc_priv(mmc); 711 struct mxs_ssp *ssp = &host->ssp; 712 713 clk_disable_unprepare(ssp->clk); 714 return 0; 715} 716 717static int mxs_mmc_resume(struct device *dev) 718{ 719 struct mmc_host *mmc = dev_get_drvdata(dev); 720 struct mxs_mmc_host *host = mmc_priv(mmc); 721 struct mxs_ssp *ssp = &host->ssp; 722 723 return clk_prepare_enable(ssp->clk); 724} 725#endif 726 727static SIMPLE_DEV_PM_OPS(mxs_mmc_pm_ops, mxs_mmc_suspend, mxs_mmc_resume); 728 729static struct platform_driver mxs_mmc_driver = { 730 .probe = mxs_mmc_probe, 731 .remove = mxs_mmc_remove, 732 .id_table = mxs_ssp_ids, 733 .driver = { 734 .name = DRIVER_NAME, 735 .pm = &mxs_mmc_pm_ops, 736 .of_match_table = mxs_mmc_dt_ids, 737 }, 738}; 739 740module_platform_driver(mxs_mmc_driver); 741 742MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral"); 743MODULE_AUTHOR("Freescale Semiconductor"); 744MODULE_LICENSE("GPL"); 745MODULE_ALIAS("platform:" DRIVER_NAME); 746