/* * Portions copyright (C) 2003 Russell King, PXA MMCI Driver * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver * * Copyright 2008 Embedded Alley Solutions, Inc. * Copyright 2009-2011 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_gpio.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/highmem.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/completion.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/mmc/sdio.h> #include <linux/mmc/slot-gpio.h> #include <linux/gpio.h> #include <linux/regulator/consumer.h> #include <linux/module.h> #include <linux/stmp_device.h> #include <linux/spi/mxs-spi.h> #define DRIVER_NAME "mxs-mmc" #define MXS_MMC_IRQ_BITS (BM_SSP_CTRL1_SDIO_IRQ | \ BM_SSP_CTRL1_RESP_ERR_IRQ | \ BM_SSP_CTRL1_RESP_TIMEOUT_IRQ | \ BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | \ BM_SSP_CTRL1_DATA_CRC_IRQ | \ BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | \ BM_SSP_CTRL1_RECV_TIMEOUT_IRQ | \ BM_SSP_CTRL1_FIFO_OVERRUN_IRQ) /* card detect polling timeout */ #define MXS_MMC_DETECT_TIMEOUT (HZ/2) struct mxs_mmc_host { struct mxs_ssp ssp; struct mmc_host *mmc; struct mmc_request *mrq; struct mmc_command *cmd; struct mmc_data *data; unsigned char bus_width; spinlock_t lock; int sdio_irq_en; bool broken_cd; }; static int mxs_mmc_get_cd(struct mmc_host *mmc) { struct mxs_mmc_host *host = mmc_priv(mmc); struct mxs_ssp *ssp = &host->ssp; int present, ret; if (host->broken_cd) return -ENOSYS; ret = mmc_gpio_get_cd(mmc); if (ret >= 0) return ret; present = mmc->caps & MMC_CAP_NEEDS_POLL || !(readl(ssp->base + HW_SSP_STATUS(ssp)) & BM_SSP_STATUS_CARD_DETECT); if (mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH) present = !present; return present; } static int mxs_mmc_reset(struct mxs_mmc_host *host) { struct mxs_ssp *ssp = &host->ssp; u32 ctrl0, ctrl1; int ret; ret = stmp_reset_block(ssp->base); if (ret) return ret; ctrl0 = BM_SSP_CTRL0_IGNORE_CRC; ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) | BF_SSP(0x7, CTRL1_WORD_LENGTH) | BM_SSP_CTRL1_DMA_ENABLE | BM_SSP_CTRL1_POLARITY | BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN | BM_SSP_CTRL1_DATA_CRC_IRQ_EN | BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN | BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN | BM_SSP_CTRL1_RESP_ERR_IRQ_EN; writel(BF_SSP(0xffff, TIMING_TIMEOUT) | BF_SSP(2, TIMING_CLOCK_DIVIDE) | BF_SSP(0, TIMING_CLOCK_RATE), ssp->base + HW_SSP_TIMING(ssp)); if (host->sdio_irq_en) { ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; ctrl1 |= BM_SSP_CTRL1_SDIO_IRQ_EN; } writel(ctrl0, ssp->base + HW_SSP_CTRL0); writel(ctrl1, ssp->base + HW_SSP_CTRL1(ssp)); return 0; } static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, struct mmc_command *cmd); static void mxs_mmc_request_done(struct mxs_mmc_host *host) { struct mmc_command *cmd = host->cmd; struct mmc_data *data = host->data; struct mmc_request *mrq = host->mrq; struct mxs_ssp *ssp = &host->ssp; if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) { if (mmc_resp_type(cmd) & MMC_RSP_136) { cmd->resp[3] = readl(ssp->base + HW_SSP_SDRESP0(ssp)); cmd->resp[2] = readl(ssp->base + HW_SSP_SDRESP1(ssp)); cmd->resp[1] = readl(ssp->base + HW_SSP_SDRESP2(ssp)); cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP3(ssp)); } else { cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP0(ssp)); } } if (data) { dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, ssp->dma_dir); /* * If there was an error on any block, we mark all * data blocks as being in error. */ if (!data->error) data->bytes_xfered = data->blocks * data->blksz; else data->bytes_xfered = 0; host->data = NULL; if (mrq->stop) { mxs_mmc_start_cmd(host, mrq->stop); return; } } host->mrq = NULL; mmc_request_done(host->mmc, mrq); } static void mxs_mmc_dma_irq_callback(void *param) { struct mxs_mmc_host *host = param; mxs_mmc_request_done(host); } static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id) { struct mxs_mmc_host *host = dev_id; struct mmc_command *cmd = host->cmd; struct mmc_data *data = host->data; struct mxs_ssp *ssp = &host->ssp; u32 stat; spin_lock(&host->lock); stat = readl(ssp->base + HW_SSP_CTRL1(ssp)); writel(stat & MXS_MMC_IRQ_BITS, ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR); spin_unlock(&host->lock); if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN)) mmc_signal_sdio_irq(host->mmc); if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ) cmd->error = -ETIMEDOUT; else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ) cmd->error = -EIO; if (data) { if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | BM_SSP_CTRL1_RECV_TIMEOUT_IRQ)) data->error = -ETIMEDOUT; else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ) data->error = -EILSEQ; else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | BM_SSP_CTRL1_FIFO_OVERRUN_IRQ)) data->error = -EIO; } return IRQ_HANDLED; } static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( struct mxs_mmc_host *host, unsigned long flags) { struct mxs_ssp *ssp = &host->ssp; struct dma_async_tx_descriptor *desc; struct mmc_data *data = host->data; struct scatterlist * sgl; unsigned int sg_len; if (data) { /* data */ dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, ssp->dma_dir); sgl = data->sg; sg_len = data->sg_len; } else { /* pio */ sgl = (struct scatterlist *) ssp->ssp_pio_words; sg_len = SSP_PIO_NUM; } desc = dmaengine_prep_slave_sg(ssp->dmach, sgl, sg_len, ssp->slave_dirn, flags); if (desc) { desc->callback = mxs_mmc_dma_irq_callback; desc->callback_param = host; } else { if (data) dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, ssp->dma_dir); } return desc; } static void mxs_mmc_bc(struct mxs_mmc_host *host) { struct mxs_ssp *ssp = &host->ssp; struct mmc_command *cmd = host->cmd; struct dma_async_tx_descriptor *desc; u32 ctrl0, cmd0, cmd1; ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC; cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC; cmd1 = cmd->arg; if (host->sdio_irq_en) { ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; } ssp->ssp_pio_words[0] = ctrl0; ssp->ssp_pio_words[1] = cmd0; ssp->ssp_pio_words[2] = cmd1; ssp->dma_dir = DMA_NONE; ssp->slave_dirn = DMA_TRANS_NONE; desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK); if (!desc) goto out; dmaengine_submit(desc); dma_async_issue_pending(ssp->dmach); return; out: dev_warn(mmc_dev(host->mmc), "%s: failed to prep dma\n", __func__); } static void mxs_mmc_ac(struct mxs_mmc_host *host) { struct mxs_ssp *ssp = &host->ssp; struct mmc_command *cmd = host->cmd; struct dma_async_tx_descriptor *desc; u32 ignore_crc, get_resp, long_resp; u32 ctrl0, cmd0, cmd1; ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? 0 : BM_SSP_CTRL0_IGNORE_CRC; get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? BM_SSP_CTRL0_GET_RESP : 0; long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? BM_SSP_CTRL0_LONG_RESP : 0; ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp; cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); cmd1 = cmd->arg; if (host->sdio_irq_en) { ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; } ssp->ssp_pio_words[0] = ctrl0; ssp->ssp_pio_words[1] = cmd0; ssp->ssp_pio_words[2] = cmd1; ssp->dma_dir = DMA_NONE; ssp->slave_dirn = DMA_TRANS_NONE; desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK); if (!desc) goto out; dmaengine_submit(desc); dma_async_issue_pending(ssp->dmach); return; out: dev_warn(mmc_dev(host->mmc), "%s: failed to prep dma\n", __func__); } static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns) { const unsigned int ssp_timeout_mul = 4096; /* * Calculate ticks in ms since ns are large numbers * and might overflow */ const unsigned int clock_per_ms = clock_rate / 1000; const unsigned int ms = ns / 1000; const unsigned int ticks = ms * clock_per_ms; const unsigned int ssp_ticks = ticks / ssp_timeout_mul; WARN_ON(ssp_ticks == 0); return ssp_ticks; } static void mxs_mmc_adtc(struct mxs_mmc_host *host) { struct mmc_command *cmd = host->cmd; struct mmc_data *data = cmd->data; struct dma_async_tx_descriptor *desc; struct scatterlist *sgl = data->sg, *sg; unsigned int sg_len = data->sg_len; unsigned int i; unsigned short dma_data_dir, timeout; enum dma_transfer_direction slave_dirn; unsigned int data_size = 0, log2_blksz; unsigned int blocks = data->blocks; struct mxs_ssp *ssp = &host->ssp; u32 ignore_crc, get_resp, long_resp, read; u32 ctrl0, cmd0, cmd1, val; ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? 0 : BM_SSP_CTRL0_IGNORE_CRC; get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? BM_SSP_CTRL0_GET_RESP : 0; long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? BM_SSP_CTRL0_LONG_RESP : 0; if (data->flags & MMC_DATA_WRITE) { dma_data_dir = DMA_TO_DEVICE; slave_dirn = DMA_MEM_TO_DEV; read = 0; } else { dma_data_dir = DMA_FROM_DEVICE; slave_dirn = DMA_DEV_TO_MEM; read = BM_SSP_CTRL0_READ; } ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) | ignore_crc | get_resp | long_resp | BM_SSP_CTRL0_DATA_XFER | read | BM_SSP_CTRL0_WAIT_FOR_IRQ | BM_SSP_CTRL0_ENABLE; cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); /* get logarithm to base 2 of block size for setting register */ log2_blksz = ilog2(data->blksz); /* * take special care of the case that data size from data->sg * is not equal to blocks x blksz */ for_each_sg(sgl, sg, sg_len, i) data_size += sg->length; if (data_size != data->blocks * data->blksz) blocks = 1; /* xfer count, block size and count need to be set differently */ if (ssp_is_old(ssp)) { ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT); cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) | BF_SSP(blocks - 1, CMD0_BLOCK_COUNT); } else { writel(data_size, ssp->base + HW_SSP_XFER_SIZE); writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) | BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT), ssp->base + HW_SSP_BLOCK_SIZE); } if ((cmd->opcode == MMC_STOP_TRANSMISSION) || (cmd->opcode == SD_IO_RW_EXTENDED)) cmd0 |= BM_SSP_CMD0_APPEND_8CYC; cmd1 = cmd->arg; if (host->sdio_irq_en) { ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; } /* set the timeout count */ timeout = mxs_ns_to_ssp_ticks(ssp->clk_rate, data->timeout_ns); val = readl(ssp->base + HW_SSP_TIMING(ssp)); val &= ~(BM_SSP_TIMING_TIMEOUT); val |= BF_SSP(timeout, TIMING_TIMEOUT); writel(val, ssp->base + HW_SSP_TIMING(ssp)); /* pio */ ssp->ssp_pio_words[0] = ctrl0; ssp->ssp_pio_words[1] = cmd0; ssp->ssp_pio_words[2] = cmd1; ssp->dma_dir = DMA_NONE; ssp->slave_dirn = DMA_TRANS_NONE; desc = mxs_mmc_prep_dma(host, 0); if (!desc) goto out; /* append data sg */ WARN_ON(host->data != NULL); host->data = data; ssp->dma_dir = dma_data_dir; ssp->slave_dirn = slave_dirn; desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) goto out; dmaengine_submit(desc); dma_async_issue_pending(ssp->dmach); return; out: dev_warn(mmc_dev(host->mmc), "%s: failed to prep dma\n", __func__); } static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, struct mmc_command *cmd) { host->cmd = cmd; switch (mmc_cmd_type(cmd)) { case MMC_CMD_BC: mxs_mmc_bc(host); break; case MMC_CMD_BCR: mxs_mmc_ac(host); break; case MMC_CMD_AC: mxs_mmc_ac(host); break; case MMC_CMD_ADTC: mxs_mmc_adtc(host); break; default: dev_warn(mmc_dev(host->mmc), "%s: unknown MMC command\n", __func__); break; } } static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct mxs_mmc_host *host = mmc_priv(mmc); WARN_ON(host->mrq != NULL); host->mrq = mrq; mxs_mmc_start_cmd(host, mrq->cmd); } static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct mxs_mmc_host *host = mmc_priv(mmc); if (ios->bus_width == MMC_BUS_WIDTH_8) host->bus_width = 2; else if (ios->bus_width == MMC_BUS_WIDTH_4) host->bus_width = 1; else host->bus_width = 0; if (ios->clock) mxs_ssp_set_clk_rate(&host->ssp, ios->clock); } static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) { struct mxs_mmc_host *host = mmc_priv(mmc); struct mxs_ssp *ssp = &host->ssp; unsigned long flags; spin_lock_irqsave(&host->lock, flags); host->sdio_irq_en = enable; if (enable) { writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); writel(BM_SSP_CTRL1_SDIO_IRQ_EN, ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_SET); } else { writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR); writel(BM_SSP_CTRL1_SDIO_IRQ_EN, ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR); } spin_unlock_irqrestore(&host->lock, flags); if (enable && readl(ssp->base + HW_SSP_STATUS(ssp)) & BM_SSP_STATUS_SDIO_IRQ) mmc_signal_sdio_irq(host->mmc); } static const struct mmc_host_ops mxs_mmc_ops = { .request = mxs_mmc_request, .get_ro = mmc_gpio_get_ro, .get_cd = mxs_mmc_get_cd, .set_ios = mxs_mmc_set_ios, .enable_sdio_irq = mxs_mmc_enable_sdio_irq, }; static struct platform_device_id mxs_ssp_ids[] = { { .name = "imx23-mmc", .driver_data = IMX23_SSP, }, { .name = "imx28-mmc", .driver_data = IMX28_SSP, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, mxs_ssp_ids); static const struct of_device_id mxs_mmc_dt_ids[] = { { .compatible = "fsl,imx23-mmc", .data = (void *) IMX23_SSP, }, { .compatible = "fsl,imx28-mmc", .data = (void *) IMX28_SSP, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids); static int mxs_mmc_probe(struct platform_device *pdev) { const struct of_device_id *of_id = of_match_device(mxs_mmc_dt_ids, &pdev->dev); struct device_node *np = pdev->dev.of_node; struct mxs_mmc_host *host; struct mmc_host *mmc; struct resource *iores; int ret = 0, irq_err; struct regulator *reg_vmmc; struct mxs_ssp *ssp; iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq_err = platform_get_irq(pdev, 0); if (!iores || irq_err < 0) return -EINVAL; mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev); if (!mmc) return -ENOMEM; host = mmc_priv(mmc); ssp = &host->ssp; ssp->dev = &pdev->dev; ssp->base = devm_ioremap_resource(&pdev->dev, iores); if (IS_ERR(ssp->base)) { ret = PTR_ERR(ssp->base); goto out_mmc_free; } ssp->devid = (enum mxs_ssp_id) of_id->data; host->mmc = mmc; host->sdio_irq_en = 0; reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc"); if (!IS_ERR(reg_vmmc)) { ret = regulator_enable(reg_vmmc); if (ret) { dev_err(&pdev->dev, "Failed to enable vmmc regulator: %d\n", ret); goto out_mmc_free; } } ssp->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(ssp->clk)) { ret = PTR_ERR(ssp->clk); goto out_mmc_free; } clk_prepare_enable(ssp->clk); ret = mxs_mmc_reset(host); if (ret) { dev_err(&pdev->dev, "Failed to reset mmc: %d\n", ret); goto out_clk_disable; } ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx"); if (!ssp->dmach) { dev_err(mmc_dev(host->mmc), "%s: failed to request dma\n", __func__); ret = -ENODEV; goto out_clk_disable; } /* set mmc core parameters */ mmc->ops = &mxs_mmc_ops; mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL; host->broken_cd = of_property_read_bool(np, "broken-cd"); mmc->f_min = 400000; mmc->f_max = 288000000; ret = mmc_of_parse(mmc); if (ret) goto out_clk_disable; mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; mmc->max_segs = 52; mmc->max_blk_size = 1 << 0xf; mmc->max_blk_count = (ssp_is_old(ssp)) ? 0xff : 0xffffff; mmc->max_req_size = (ssp_is_old(ssp)) ? 0xffff : 0xffffffff; mmc->max_seg_size = dma_get_max_seg_size(ssp->dmach->device->dev); platform_set_drvdata(pdev, mmc); ret = devm_request_irq(&pdev->dev, irq_err, mxs_mmc_irq_handler, 0, DRIVER_NAME, host); if (ret) goto out_free_dma; spin_lock_init(&host->lock); ret = mmc_add_host(mmc); if (ret) goto out_free_dma; dev_info(mmc_dev(host->mmc), "initialized\n"); return 0; out_free_dma: if (ssp->dmach) dma_release_channel(ssp->dmach); out_clk_disable: clk_disable_unprepare(ssp->clk); out_mmc_free: mmc_free_host(mmc); return ret; } static int mxs_mmc_remove(struct platform_device *pdev) { struct mmc_host *mmc = platform_get_drvdata(pdev); struct mxs_mmc_host *host = mmc_priv(mmc); struct mxs_ssp *ssp = &host->ssp; mmc_remove_host(mmc); if (ssp->dmach) dma_release_channel(ssp->dmach); clk_disable_unprepare(ssp->clk); mmc_free_host(mmc); return 0; } #ifdef CONFIG_PM static int mxs_mmc_suspend(struct device *dev) { struct mmc_host *mmc = dev_get_drvdata(dev); struct mxs_mmc_host *host = mmc_priv(mmc); struct mxs_ssp *ssp = &host->ssp; clk_disable_unprepare(ssp->clk); return 0; } static int mxs_mmc_resume(struct device *dev) { struct mmc_host *mmc = dev_get_drvdata(dev); struct mxs_mmc_host *host = mmc_priv(mmc); struct mxs_ssp *ssp = &host->ssp; clk_prepare_enable(ssp->clk); return 0; } static const struct dev_pm_ops mxs_mmc_pm_ops = { .suspend = mxs_mmc_suspend, .resume = mxs_mmc_resume, }; #endif static struct platform_driver mxs_mmc_driver = { .probe = mxs_mmc_probe, .remove = mxs_mmc_remove, .id_table = mxs_ssp_ids, .driver = { .name = DRIVER_NAME, #ifdef CONFIG_PM .pm = &mxs_mmc_pm_ops, #endif .of_match_table = mxs_mmc_dt_ids, }, }; module_platform_driver(mxs_mmc_driver); MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral"); MODULE_AUTHOR("Freescale Semiconductor"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRIVER_NAME);