[PATCH] mci: add designware mmc controller support

[Sascha Hauer <s.hauer@pengutronix.de>]

Based on the U-Boot driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/mci/Kconfig            |   8 +
 drivers/mci/Makefile           |   1 +
 drivers/mci/dw_mmc.c           | 606 +++++++++++++++++++++++++++++++++++++++++
 include/platform_data/dw_mmc.h |   9 +
 4 files changed, 624 insertions(+)
 create mode 100644 drivers/mci/dw_mmc.c
 create mode 100644 include/platform_data/dw_mmc.h

diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig
index 7aff7df..f34c119 100644
--- a/drivers/mci/Kconfig
+++ b/drivers/mci/Kconfig
@@ -34,6 +34,14 @@ config MCI_MMC_BOOT_PARTITIONS
 
 comment "--- MCI host drivers ---"
 
+config MCI_DW
+	bool "Synopsys DesignWare Memory Card Interface"
+	depends on ARM
+	help
+	  This selects support for the Synopsys DesignWare Mobile Storage IP
+	  block, this provides host support for SD and MMC interfaces, in both
+	  PIO and external DMA modes.
+
 config MCI_MXS
 	bool "i.MX23/i.MX28"
 	depends on ARCH_MXS
diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile
index df06a08..c13dad3 100644
--- a/drivers/mci/Makefile
+++ b/drivers/mci/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_MCI_OMAP_HSMMC)	+= omap_hsmmc.o
 obj-$(CONFIG_MCI_PXA)		+= pxamci.o
 obj-$(CONFIG_MCI_S3C)		+= s3c.o
 obj-$(CONFIG_MCI_SPI)		+= mci_spi.o
+obj-$(CONFIG_MCI_DW)		+= dw_mmc.o
diff --git a/drivers/mci/dw_mmc.c b/drivers/mci/dw_mmc.c
new file mode 100644
index 0000000..bd640ae
--- /dev/null
+++ b/drivers/mci/dw_mmc.c
@@ -0,0 +1,606 @@
+/*
+ * Copyright (C) 2013 Altera Corporation <www.altera.com>
+ *
+ * (C) Copyright 2012 SAMSUNG Electronics
+ * Jaehoon Chung <jh80.chung@samsung.com>
+ * Rajeshawari Shinde <rajeshwari.s@samsung.com>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,  MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <malloc.h>
+#include <clock.h>
+#include <init.h>
+#include <mci.h>
+#include <io.h>
+#include <platform_data/dw_mmc.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <asm-generic/errno.h>
+#include <asm/mmu.h>
+
+#define DWMCI_CTRL		0x000
+#define	DWMCI_PWREN		0x004
+#define DWMCI_CLKDIV		0x008
+#define DWMCI_CLKSRC		0x00C
+#define DWMCI_CLKENA		0x010
+#define DWMCI_TMOUT		0x014
+#define DWMCI_CTYPE		0x018
+#define DWMCI_BLKSIZ		0x01C
+#define DWMCI_BYTCNT		0x020
+#define DWMCI_INTMASK		0x024
+#define DWMCI_CMDARG		0x028
+#define DWMCI_CMD		0x02C
+#define DWMCI_RESP0		0x030
+#define DWMCI_RESP1		0x034
+#define DWMCI_RESP2		0x038
+#define DWMCI_RESP3		0x03C
+#define DWMCI_MINTSTS		0x040
+#define DWMCI_RINTSTS		0x044
+#define DWMCI_STATUS		0x048
+#define DWMCI_FIFOTH		0x04C
+#define DWMCI_CDETECT		0x050
+#define DWMCI_WRTPRT		0x054
+#define DWMCI_GPIO		0x058
+#define DWMCI_TCMCNT		0x05C
+#define DWMCI_TBBCNT		0x060
+#define DWMCI_DEBNCE		0x064
+#define DWMCI_USRID		0x068
+#define DWMCI_VERID		0x06C
+#define DWMCI_HCON		0x070
+#define DWMCI_UHS_REG		0x074
+#define DWMCI_BMOD		0x080
+#define DWMCI_PLDMND		0x084
+#define DWMCI_DBADDR		0x088
+#define DWMCI_IDSTS		0x08C
+#define DWMCI_IDINTEN		0x090
+#define DWMCI_DSCADDR		0x094
+#define DWMCI_BUFADDR		0x098
+#define DWMCI_DATA		0x200
+
+/* Interrupt Mask register */
+#define DWMCI_INTMSK_ALL		0xffffffff
+#define DWMCI_INTMSK_RE			(1 << 1)
+#define DWMCI_INTMSK_CDONE		(1 << 2)
+#define DWMCI_INTMSK_DTO		(1 << 3)
+#define DWMCI_INTMSK_TXDR		(1 << 4)
+#define DWMCI_INTMSK_RXDR		(1 << 5)
+#define DWMCI_INTMSK_RCRC		(1 << 6)
+#define DWMCI_INTMSK_DCRC		(1 << 7)
+#define DWMCI_INTMSK_RTO		(1 << 8)
+#define DWMCI_INTMSK_DRTO		(1 << 9)
+#define DWMCI_INTMSK_HTO		(1 << 10)
+#define DWMCI_INTMSK_FRUN		(1 << 11)
+#define DWMCI_INTMSK_HLE		(1 << 12)
+#define DWMCI_INTMSK_SBE		(1 << 13)
+#define DWMCI_INTMSK_ACD		(1 << 14)
+#define DWMCI_INTMSK_EBE		(1 << 15)
+
+/* Raw interrupt Register */
+#define DWMCI_DATA_ERR	(DWMCI_INTMSK_EBE | DWMCI_INTMSK_SBE | DWMCI_INTMSK_HLE |\
+			DWMCI_INTMSK_FRUN | DWMCI_INTMSK_DCRC)
+#define DWMCI_DATA_TOUT	(DWMCI_INTMSK_HTO | DWMCI_INTMSK_DRTO)
+
+/* CTRL register */
+#define DWMCI_CTRL_RESET		(1 << 0)
+#define DWMCI_CTRL_FIFO_RESET		(1 << 1)
+#define DWMCI_CTRL_DMA_RESET		(1 << 2)
+#define DWMCI_DMA_EN			(1 << 5)
+#define DWMCI_CTRL_SEND_AS_CCSD		(1 << 10)
+#define DWMCI_IDMAC_EN			(1 << 25)
+#define DWMCI_RESET_ALL			(DWMCI_CTRL_RESET | DWMCI_CTRL_FIFO_RESET |\
+				DWMCI_CTRL_DMA_RESET)
+
+/* CMD register */
+#define DWMCI_CMD_RESP_EXP		(1 << 6)
+#define DWMCI_CMD_RESP_LENGTH		(1 << 7)
+#define DWMCI_CMD_CHECK_CRC		(1 << 8)
+#define DWMCI_CMD_DATA_EXP		(1 << 9)
+#define DWMCI_CMD_RW			(1 << 10)
+#define DWMCI_CMD_SEND_STOP		(1 << 12)
+#define DWMCI_CMD_ABORT_STOP		(1 << 14)
+#define DWMCI_CMD_PRV_DAT_WAIT		(1 << 13)
+#define DWMCI_CMD_UPD_CLK		(1 << 21)
+#define DWMCI_CMD_USE_HOLD_REG		(1 << 29)
+#define DWMCI_CMD_START			(1 << 31)
+
+/* CLKENA register */
+#define DWMCI_CLKEN_ENABLE		(1 << 0)
+#define DWMCI_CLKEN_LOW_PWR		(1 << 16)
+
+/* Card-type register */
+#define DWMCI_CTYPE_1BIT		0
+#define DWMCI_CTYPE_4BIT		(1 << 0)
+#define DWMCI_CTYPE_8BIT		(1 << 16)
+
+/* Status Register */
+#define DWMCI_STATUS_BUSY		(1 << 9)
+
+/* FIFOTH Register */
+#define DWMCI_FIFOTH_MSIZE(x)		((x) << 28)
+#define DWMCI_FIFOTH_RX_WMARK(x)	((x) << 16)
+#define DWMCI_FIFOTH_TX_WMARK(x)	(x)
+#define DWMCI_FIFOTH_FIFO_DEPTH(x)	((((x) >> 16) & 0x3ff) + 1)
+
+#define DWMCI_IDMAC_OWN			(1 << 31)
+#define DWMCI_IDMAC_CH			(1 << 4)
+#define DWMCI_IDMAC_FS			(1 << 3)
+#define DWMCI_IDMAC_LD			(1 << 2)
+
+/* Bus Mode Register */
+#define DWMCI_BMOD_IDMAC_RESET		(1 << 0)
+#define DWMCI_BMOD_IDMAC_FB		(1 << 1)
+#define DWMCI_BMOD_IDMAC_EN		(1 << 7)
+
+struct dwmci_host {
+	struct mci_host mci;
+	struct device_d *dev;
+	struct clk *clk_biu, *clk_ciu;
+	void *ioaddr;
+	unsigned int fifo_size_bytes;
+
+	struct dwmci_idmac *idmac;
+	unsigned long clkrate;
+	int ciu_div;
+};
+
+struct dwmci_idmac {
+	uint32_t flags;
+	uint32_t cnt;
+	uint32_t addr;
+	uint32_t next_addr;
+};
+
+static inline void dwmci_writel(struct dwmci_host *host, int reg, uint32_t val)
+{
+	writel(val, host->ioaddr + reg);
+}
+
+static inline uint32_t dwmci_readl(struct dwmci_host *host, int reg)
+{
+	return readl(host->ioaddr + reg);
+}
+
+#define DW_MMC_NUM_IDMACS	(PAGE_SIZE / sizeof(struct dwmci_idmac))
+
+static inline struct dwmci_host *to_dwmci_host(struct mci_host *mci)
+{
+	return container_of(mci, struct dwmci_host, mci);
+}
+
+static int dwmci_wait_reset(struct dwmci_host *host, uint32_t value)
+{
+	uint64_t start;
+	uint32_t ctrl;
+
+	start = get_time_ns();
+
+	dwmci_writel(host, DWMCI_CTRL, value);
+
+	while (!is_timeout(start, SECOND)) {
+		ctrl = dwmci_readl(host, DWMCI_CTRL);
+		if (!(ctrl & DWMCI_RESET_ALL))
+			return 0;
+	}
+
+	return -EIO;
+}
+
+static int dwmci_prepare_data(struct dwmci_host *host,
+		struct mci_data *data)
+{
+	unsigned long ctrl;
+	unsigned int i = 0, flags, cnt, blk_cnt;
+	unsigned long data_start, start_addr;
+	struct dwmci_idmac *desc = host->idmac;
+
+	blk_cnt = data->blocks;
+
+	if (blk_cnt > DW_MMC_NUM_IDMACS)
+		return -EINVAL;
+
+	dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
+
+	data_start = (uint32_t)desc;
+	dwmci_writel(host, DWMCI_DBADDR, (uint32_t)desc);
+
+	if (data->flags & MMC_DATA_READ)
+		start_addr = (uint32_t)data->dest;
+	else
+		start_addr = (uint32_t)data->src;
+
+	do {
+		flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH;
+		flags |= (i == 0) ? DWMCI_IDMAC_FS : 0;
+
+		if (blk_cnt <= 8) {
+			flags |= DWMCI_IDMAC_LD;
+			cnt = data->blocksize * blk_cnt;
+		} else {
+			cnt = data->blocksize * 8;
+		}
+
+		desc->flags = flags;
+		desc->cnt = cnt;
+		desc->addr = start_addr + (i * PAGE_SIZE);
+		desc->next_addr = (uint32_t)(desc + 1);
+
+		dev_dbg(host->dev, "desc@ 0x%p 0x%08x 0x%08x 0x%08x 0x%08x\n",
+				desc, flags, cnt, desc->addr, desc->next_addr);
+		if (blk_cnt < 8)
+			break;
+
+		blk_cnt -= 8;
+		desc++;
+		i++;
+	} while (1);
+
+	ctrl = dwmci_readl(host, DWMCI_CTRL);
+	ctrl |= DWMCI_IDMAC_EN | DWMCI_DMA_EN;
+	dwmci_writel(host, DWMCI_CTRL, ctrl);
+
+	ctrl = dwmci_readl(host, DWMCI_BMOD);
+	ctrl |= DWMCI_BMOD_IDMAC_FB | DWMCI_BMOD_IDMAC_EN;
+	dwmci_writel(host, DWMCI_BMOD, ctrl);
+
+	dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
+	dwmci_writel(host, DWMCI_BYTCNT, data->blocksize * data->blocks);
+
+	return 0;
+}
+
+static int dwmci_set_transfer_mode(struct dwmci_host *host,
+		struct mci_data *data)
+{
+	unsigned long mode;
+
+	mode = DWMCI_CMD_DATA_EXP;
+	if (data->flags & MMC_DATA_WRITE)
+		mode |= DWMCI_CMD_RW;
+
+	return mode;
+}
+
+static int
+dwmci_cmd(struct mci_host *mci, struct mci_cmd *cmd, struct mci_data *data)
+{
+	struct dwmci_host *host = to_dwmci_host(mci);
+	int flags = 0, i;
+	unsigned int timeout = 100000;
+	uint32_t retry = 10000;
+	uint32_t mask, ctrl;
+	uint64_t start;
+	int ret;
+	unsigned int num_bytes = 0;
+	const void *writebuf = NULL;
+
+	while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_STATUS_BUSY) {
+		if (timeout == 0) {
+			dev_dbg(host->dev, "Timeout on data busy\n");
+			return -ETIMEDOUT;
+		}
+		timeout--;
+	}
+
+	dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
+
+
+	if (data) {
+		num_bytes = data->blocks * data->blocksize;
+
+		if (data->flags & MMC_DATA_WRITE) {
+			dma_flush_range((unsigned long)data->src,
+				(unsigned long)(data->src + data->blocks * 512));
+
+			writebuf = data->src;
+		}
+
+		ret = dwmci_prepare_data(host, data);
+		if (ret)
+			return ret;
+	}
+
+	dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
+
+	if (data)
+		flags = dwmci_set_transfer_mode(host, data);
+
+	if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
+		return -EINVAL;
+
+	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
+		flags |= DWMCI_CMD_ABORT_STOP;
+	else
+		flags |= DWMCI_CMD_PRV_DAT_WAIT;
+
+	if (cmd->resp_type & MMC_RSP_PRESENT) {
+		flags |= DWMCI_CMD_RESP_EXP;
+		if (cmd->resp_type & MMC_RSP_136)
+			flags |= DWMCI_CMD_RESP_LENGTH;
+	}
+
+	if (cmd->resp_type & MMC_RSP_CRC)
+		flags |= DWMCI_CMD_CHECK_CRC;
+
+	flags |= (cmd->cmdidx | DWMCI_CMD_START | DWMCI_CMD_USE_HOLD_REG);
+
+	dev_dbg(host->dev, "Sending CMD%d\n", cmd->cmdidx);
+
+	dwmci_writel(host, DWMCI_CMD, flags);
+
+	for (i = 0; i < retry; i++) {
+		mask = dwmci_readl(host, DWMCI_RINTSTS);
+		if (mask & DWMCI_INTMSK_CDONE) {
+			if (!data)
+				dwmci_writel(host, DWMCI_RINTSTS, mask);
+			break;
+		}
+	}
+
+	if (i == retry)
+		return -ETIMEDOUT;
+
+	if (mask & DWMCI_INTMSK_RTO) {
+		dev_dbg(host->dev, "Response Timeout..\n");
+		return -ETIMEDOUT;
+	} else if (mask & DWMCI_INTMSK_RE) {
+		dev_dbg(host->dev, "Response Error..\n");
+		return -EIO;
+	}
+
+	if (cmd->resp_type & MMC_RSP_PRESENT) {
+		if (cmd->resp_type & MMC_RSP_136) {
+			cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
+			cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
+			cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
+			cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
+		} else {
+			cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
+		}
+	}
+
+	if (data) {
+		start = get_time_ns();
+		do {
+			mask = dwmci_readl(host, DWMCI_RINTSTS);
+			if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
+				dev_dbg(host->dev, "DATA ERROR!\n");
+				return -EIO;
+			}
+			if (is_timeout(start, SECOND))
+				return -ETIMEDOUT;
+		} while (!(mask & DWMCI_INTMSK_DTO));
+
+		dwmci_writel(host, DWMCI_RINTSTS, mask);
+
+		ctrl = dwmci_readl(host, DWMCI_CTRL);
+		ctrl &= ~(DWMCI_DMA_EN);
+		dwmci_writel(host, DWMCI_CTRL, ctrl);
+
+		if (data->flags & MMC_DATA_READ) {
+			dma_inv_range((unsigned long)data->dest,
+					(unsigned long)(data->dest + data->blocks * 512));
+		}
+	}
+
+	udelay(100);
+
+	return 0;
+}
+
+static int dwmci_send_cmd(struct dwmci_host *host, u32 cmd, u32 arg)
+{
+	uint64_t start = get_time_ns();
+	uint32_t status;
+
+	dwmci_writel(host, DWMCI_CMDARG, arg);
+
+	dwmci_writel(host, DWMCI_CMD, cmd | DWMCI_CMD_START);
+
+	while (1) {
+		status = dwmci_readl(host, DWMCI_CMD);
+		if (!(status & DWMCI_CMD_START))
+			return 0;
+
+		if (is_timeout(start, 100 * MSECOND)) {
+			dev_err(host->dev, "TIMEOUT error!!\n");
+			return -ETIMEDOUT;
+		}
+	}
+}
+
+static int dwmci_setup_bus(struct dwmci_host *host, uint32_t freq)
+{
+	uint32_t div;
+	unsigned long sclk;
+
+	sclk = host->clkrate / host->ciu_div;
+
+	div = DIV_ROUND_UP(sclk, 2 * freq);
+	if (div > 255)
+		div = 255;
+
+	dwmci_writel(host, DWMCI_CLKENA, 0);
+	dwmci_writel(host, DWMCI_CLKSRC, 0);
+
+	dwmci_writel(host, DWMCI_CLKDIV, div);
+
+	dwmci_send_cmd(host, DWMCI_CMD_PRV_DAT_WAIT | DWMCI_CMD_UPD_CLK, 0);
+
+	dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE);
+
+	dwmci_send_cmd(host, DWMCI_CMD_PRV_DAT_WAIT | DWMCI_CMD_UPD_CLK, 0);
+
+	return 0;
+}
+
+static void dwmci_set_ios(struct mci_host *mci, struct mci_ios *ios)
+{
+	struct dwmci_host *host = to_dwmci_host(mci);
+	uint32_t ctype;
+
+	dev_dbg(host->dev, "Buswidth = %d, clock: %d\n", ios->bus_width, ios->clock);
+
+	if (ios->clock)
+		dwmci_setup_bus(host, ios->clock);
+
+	switch (ios->bus_width) {
+	case 8:
+		ctype = DWMCI_CTYPE_8BIT;
+		break;
+	case 4:
+		ctype = DWMCI_CTYPE_4BIT;
+		break;
+	default:
+		ctype = DWMCI_CTYPE_1BIT;
+		break;
+	}
+
+	dwmci_writel(host, DWMCI_CTYPE, ctype);
+}
+
+static int dwmci_card_present(struct mci_host *mci)
+{
+	return 1;
+}
+
+static int dwmci_init(struct mci_host *mci, struct device_d *dev)
+{
+	struct dwmci_host *host = to_dwmci_host(mci);
+	uint32_t fifo_size, fifoth_val;
+
+	dwmci_writel(host, DWMCI_PWREN, 1);
+
+	if (dwmci_wait_reset(host, DWMCI_RESET_ALL)) {
+		dev_err(host->dev, "reset failed\n");
+		return -EIO;
+	}
+
+	dwmci_writel(host, DWMCI_RINTSTS, 0xffffffff);
+	dwmci_writel(host, DWMCI_INTMASK, 0);
+
+	dwmci_writel(host, DWMCI_TMOUT, 0xffffffff);
+
+	dwmci_writel(host, DWMCI_IDINTEN, 0);
+	dwmci_writel(host, DWMCI_BMOD, 1);
+
+	fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
+
+	/*
+	 * Use reset default of the rx_wmark field to determine the
+	 * fifo depth.
+	 */
+	fifo_size = DWMCI_FIFOTH_FIFO_DEPTH(fifo_size);
+	host->fifo_size_bytes = fifo_size * 4;
+
+	fifoth_val = DWMCI_FIFOTH_MSIZE(0x2) |
+		DWMCI_FIFOTH_RX_WMARK(fifo_size / 2 - 1) |
+		DWMCI_FIFOTH_TX_WMARK(fifo_size / 2);
+
+	dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);
+
+	dwmci_writel(host, DWMCI_CLKENA, 0);
+	dwmci_writel(host, DWMCI_CLKSRC, 0);
+
+	return 0;
+}
+
+static int dw_mmc_detect(struct device_d *dev)
+{
+	struct dwmci_host *host = dev->priv;
+
+	return mci_detect_card(&host->mci);
+}
+
+static int dw_mmc_probe(struct device_d *dev)
+{
+	struct dwmci_host *host;
+	struct mci_host *mci;
+	struct dw_mmc_platform_data *pdata = dev->platform_data;
+
+	host = xzalloc(sizeof(*host));
+	mci = &host->mci;
+
+	host->clk_biu = clk_get(dev, "biu");
+	if (IS_ERR(host->clk_biu))
+		return PTR_ERR(host->clk_biu);
+
+	host->clk_ciu = clk_get(dev, "ciu");
+	if (IS_ERR(host->clk_ciu))
+		return PTR_ERR(host->clk_ciu);
+
+	clk_enable(host->clk_biu);
+	clk_enable(host->clk_ciu);
+
+	host->dev = dev;
+	host->ioaddr = dev_request_mem_region(dev, 0);
+	if (!host->ioaddr)
+		return -EBUSY;
+
+	if (pdata) {
+		mci->devname = pdata->devname;
+		host->ciu_div = pdata->ciu_div;
+	} else if (dev->device_node) {
+		const char *alias = of_alias_get(dev->device_node);
+		if (alias)
+			mci->devname = xstrdup(alias);
+		of_property_read_u32(dev->device_node, "dw-mshc-ciu-div",
+				&host->ciu_div);
+	}
+
+	/* divider is 0 based in pdata and 1 based in our private struct */
+	host->ciu_div++;
+
+	host->idmac = dma_alloc_coherent(sizeof(*host->idmac) * DW_MMC_NUM_IDMACS);
+
+	host->mci.send_cmd = dwmci_cmd;
+	host->mci.set_ios = dwmci_set_ios;
+	host->mci.init = dwmci_init;
+	host->mci.card_present = dwmci_card_present;
+	host->mci.hw_dev = dev;
+	host->mci.voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+	dev->detect = dw_mmc_detect;
+
+	host->clkrate = clk_get_rate(host->clk_ciu);
+	host->mci.f_min = host->clkrate / 510 / host->ciu_div;
+	if (host->mci.f_min < 200000)
+		host->mci.f_min = 200000;
+	host->mci.f_max = host->clkrate / host->ciu_div;
+
+	mci_of_parse(&host->mci);
+
+	dev->priv = host;
+
+	return mci_register(&host->mci);
+}
+
+static __maybe_unused struct of_device_id dw_mmc_compatible[] = {
+	{
+		.compatible = "altr,socfpga-dw-mshc",
+	}, {
+		/* sentinel */
+	}
+};
+
+static struct driver_d dw_mmc_driver = {
+	.name  = "dw_mmc",
+	.probe = dw_mmc_probe,
+	.of_compatible = DRV_OF_COMPAT(dw_mmc_compatible),
+};
+device_platform_driver(dw_mmc_driver);
diff --git a/include/platform_data/dw_mmc.h b/include/platform_data/dw_mmc.h
new file mode 100644
index 0000000..48faa76
--- /dev/null
+++ b/include/platform_data/dw_mmc.h
@@ -0,0 +1,9 @@
+#ifndef __INCLUDE_PLATFORM_DATA_DW_MMC_H
+#define __INCLUDE_PLATFORM_DATA_DW_MMC_H
+
+struct dw_mmc_platform_data {
+	char *devname;
+	int ciu_div;
+};
+
+#endif /* __INCLUDE_PLATFORM_DATA_DW_MMC_H */
-- 
1.8.4.rc3


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