1 files changed, 880 insertions, 0 deletions

diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
new file mode 100644
index 0000000..dda0be4
--- /dev/null
+++ b/drivers/mmc/host/mxcmmc.c
@@ -0,0 +1,880 @@
+/*
+ *  linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver
+ *
+ *  This is a driver for the SDHC controller found in Freescale MX2/MX3
+ *  SoCs. It is basically the same hardware as found on MX1 (imxmmc.c).
+ *  Unlike the hardware found on MX1, this hardware just works and does
+ *  not need all the quirks found in imxmmc.c, hence the seperate driver.
+ *
+ *  Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+ *  Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
+ *
+ *  derived from pxamci.c by Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/blkdev.h>
+#include <linux/dma-mapping.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/sizes.h>
+#include <mach/mmc.h>
+
+#ifdef CONFIG_ARCH_MX2
+#include <mach/dma-mx1-mx2.h>
+#define HAS_DMA
+#endif
+
+#define DRIVER_NAME "imx-mmc"
+
+#define MMC_REG_STR_STP_CLK		0x00
+#define MMC_REG_STATUS			0x04
+#define MMC_REG_CLK_RATE		0x08
+#define MMC_REG_CMD_DAT_CONT		0x0C
+#define MMC_REG_RES_TO			0x10
+#define MMC_REG_READ_TO			0x14
+#define MMC_REG_BLK_LEN			0x18
+#define MMC_REG_NOB			0x1C
+#define MMC_REG_REV_NO			0x20
+#define MMC_REG_INT_CNTR		0x24
+#define MMC_REG_CMD			0x28
+#define MMC_REG_ARG			0x2C
+#define MMC_REG_RES_FIFO		0x34
+#define MMC_REG_BUFFER_ACCESS		0x38
+
+#define STR_STP_CLK_RESET               (1 << 3)
+#define STR_STP_CLK_START_CLK           (1 << 1)
+#define STR_STP_CLK_STOP_CLK            (1 << 0)
+
+#define STATUS_CARD_INSERTION		(1 << 31)
+#define STATUS_CARD_REMOVAL		(1 << 30)
+#define STATUS_YBUF_EMPTY		(1 << 29)
+#define STATUS_XBUF_EMPTY		(1 << 28)
+#define STATUS_YBUF_FULL		(1 << 27)
+#define STATUS_XBUF_FULL		(1 << 26)
+#define STATUS_BUF_UND_RUN		(1 << 25)
+#define STATUS_BUF_OVFL			(1 << 24)
+#define STATUS_SDIO_INT_ACTIVE		(1 << 14)
+#define STATUS_END_CMD_RESP		(1 << 13)
+#define STATUS_WRITE_OP_DONE		(1 << 12)
+#define STATUS_DATA_TRANS_DONE		(1 << 11)
+#define STATUS_READ_OP_DONE		(1 << 11)
+#define STATUS_WR_CRC_ERROR_CODE_MASK	(3 << 10)
+#define STATUS_CARD_BUS_CLK_RUN		(1 << 8)
+#define STATUS_BUF_READ_RDY		(1 << 7)
+#define STATUS_BUF_WRITE_RDY		(1 << 6)
+#define STATUS_RESP_CRC_ERR		(1 << 5)
+#define STATUS_CRC_READ_ERR		(1 << 3)
+#define STATUS_CRC_WRITE_ERR		(1 << 2)
+#define STATUS_TIME_OUT_RESP		(1 << 1)
+#define STATUS_TIME_OUT_READ		(1 << 0)
+#define STATUS_ERR_MASK			0x2f
+
+#define CMD_DAT_CONT_CMD_RESP_LONG_OFF	(1 << 12)
+#define CMD_DAT_CONT_STOP_READWAIT	(1 << 11)
+#define CMD_DAT_CONT_START_READWAIT	(1 << 10)
+#define CMD_DAT_CONT_BUS_WIDTH_4	(2 << 8)
+#define CMD_DAT_CONT_INIT		(1 << 7)
+#define CMD_DAT_CONT_WRITE		(1 << 4)
+#define CMD_DAT_CONT_DATA_ENABLE	(1 << 3)
+#define CMD_DAT_CONT_RESPONSE_48BIT_CRC	(1 << 0)
+#define CMD_DAT_CONT_RESPONSE_136BIT	(2 << 0)
+#define CMD_DAT_CONT_RESPONSE_48BIT	(3 << 0)
+
+#define INT_SDIO_INT_WKP_EN		(1 << 18)
+#define INT_CARD_INSERTION_WKP_EN	(1 << 17)
+#define INT_CARD_REMOVAL_WKP_EN		(1 << 16)
+#define INT_CARD_INSERTION_EN		(1 << 15)
+#define INT_CARD_REMOVAL_EN		(1 << 14)
+#define INT_SDIO_IRQ_EN			(1 << 13)
+#define INT_DAT0_EN			(1 << 12)
+#define INT_BUF_READ_EN			(1 << 4)
+#define INT_BUF_WRITE_EN		(1 << 3)
+#define INT_END_CMD_RES_EN		(1 << 2)
+#define INT_WRITE_OP_DONE_EN		(1 << 1)
+#define INT_READ_OP_EN			(1 << 0)
+
+struct mxcmci_host {
+	struct mmc_host		*mmc;
+	struct resource		*res;
+	void __iomem		*base;
+	int			irq;
+	int			detect_irq;
+	int			dma;
+	int			do_dma;
+	unsigned int		power_mode;
+	struct imxmmc_platform_data *pdata;
+
+	struct mmc_request	*req;
+	struct mmc_command	*cmd;
+	struct mmc_data		*data;
+
+	unsigned int		dma_nents;
+	unsigned int		datasize;
+	unsigned int		dma_dir;
+
+	u16			rev_no;
+	unsigned int		cmdat;
+
+	struct clk		*clk;
+
+	int			clock;
+
+	struct work_struct	datawork;
+};
+
+static inline int mxcmci_use_dma(struct mxcmci_host *host)
+{
+	return host->do_dma;
+}
+
+static void mxcmci_softreset(struct mxcmci_host *host)
+{
+	int i;
+
+	/* reset sequence */
+	writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK);
+	writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
+			host->base + MMC_REG_STR_STP_CLK);
+
+	for (i = 0; i < 8; i++)
+		writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
+
+	writew(0xff, host->base + MMC_REG_RES_TO);
+}
+
+static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
+{
+	unsigned int nob = data->blocks;
+	unsigned int blksz = data->blksz;
+	unsigned int datasize = nob * blksz;
+#ifdef HAS_DMA
+	struct scatterlist *sg;
+	int i;
+#endif
+	if (data->flags & MMC_DATA_STREAM)
+		nob = 0xffff;
+
+	host->data = data;
+	data->bytes_xfered = 0;
+
+	writew(nob, host->base + MMC_REG_NOB);
+	writew(blksz, host->base + MMC_REG_BLK_LEN);
+	host->datasize = datasize;
+
+#ifdef HAS_DMA
+	for_each_sg(data->sg, sg, data->sg_len, i) {
+		if (sg->offset & 3 || sg->length & 3) {
+			host->do_dma = 0;
+			return;
+		}
+	}
+
+	if (data->flags & MMC_DATA_READ) {
+		host->dma_dir = DMA_FROM_DEVICE;
+		host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
+					     data->sg_len,  host->dma_dir);
+
+		imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize,
+				 host->res->start + MMC_REG_BUFFER_ACCESS,
+				 DMA_MODE_READ);
+	} else {
+		host->dma_dir = DMA_TO_DEVICE;
+		host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
+					     data->sg_len,  host->dma_dir);
+
+		imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize,
+				 host->res->start + MMC_REG_BUFFER_ACCESS,
+				 DMA_MODE_WRITE);
+	}
+
+	wmb();
+
+	imx_dma_enable(host->dma);
+#endif /* HAS_DMA */
+}
+
+static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
+		unsigned int cmdat)
+{
+	WARN_ON(host->cmd != NULL);
+	host->cmd = cmd;
+
+	switch (mmc_resp_type(cmd)) {
+	case MMC_RSP_R1: /* short CRC, OPCODE */
+	case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
+		cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
+		break;
+	case MMC_RSP_R2: /* long 136 bit + CRC */
+		cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
+		break;
+	case MMC_RSP_R3: /* short */
+		cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
+		break;
+	case MMC_RSP_NONE:
+		break;
+	default:
+		dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
+				mmc_resp_type(cmd));
+		cmd->error = -EINVAL;
+		return -EINVAL;
+	}
+
+	if (mxcmci_use_dma(host))
+		writel(INT_READ_OP_EN | INT_WRITE_OP_DONE_EN |
+				INT_END_CMD_RES_EN,
+				host->base + MMC_REG_INT_CNTR);
+	else
+		writel(INT_END_CMD_RES_EN, host->base + MMC_REG_INT_CNTR);
+
+	writew(cmd->opcode, host->base + MMC_REG_CMD);
+	writel(cmd->arg, host->base + MMC_REG_ARG);
+	writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
+
+	return 0;
+}
+
+static void mxcmci_finish_request(struct mxcmci_host *host,
+		struct mmc_request *req)
+{
+	writel(0, host->base + MMC_REG_INT_CNTR);
+
+	host->req = NULL;
+	host->cmd = NULL;
+	host->data = NULL;
+
+	mmc_request_done(host->mmc, req);
+}
+
+static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
+{
+	struct mmc_data *data = host->data;
+	int data_error;
+
+#ifdef HAS_DMA
+	if (mxcmci_use_dma(host)) {
+		imx_dma_disable(host->dma);
+		dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
+				host->dma_dir);
+	}
+#endif
+
+	if (stat & STATUS_ERR_MASK) {
+		dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
+				stat);
+		if (stat & STATUS_CRC_READ_ERR) {
+			data->error = -EILSEQ;
+		} else if (stat & STATUS_CRC_WRITE_ERR) {
+			u32 err_code = (stat >> 9) & 0x3;
+			if (err_code == 2) /* No CRC response */
+				data->error = -ETIMEDOUT;
+			else
+				data->error = -EILSEQ;
+		} else if (stat & STATUS_TIME_OUT_READ) {
+			data->error = -ETIMEDOUT;
+		} else {
+			data->error = -EIO;
+		}
+	} else {
+		data->bytes_xfered = host->datasize;
+	}
+
+	data_error = data->error;
+
+	host->data = NULL;
+
+	return data_error;
+}
+
+static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
+{
+	struct mmc_command *cmd = host->cmd;
+	int i;
+	u32 a, b, c;
+
+	if (!cmd)
+		return;
+
+	if (stat & STATUS_TIME_OUT_RESP) {
+		dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
+		cmd->error = -ETIMEDOUT;
+	} else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
+		dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
+		cmd->error = -EILSEQ;
+	}
+
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136) {
+			for (i = 0; i < 4; i++) {
+				a = readw(host->base + MMC_REG_RES_FIFO);
+				b = readw(host->base + MMC_REG_RES_FIFO);
+				cmd->resp[i] = a << 16 | b;
+			}
+		} else {
+			a = readw(host->base + MMC_REG_RES_FIFO);
+			b = readw(host->base + MMC_REG_RES_FIFO);
+			c = readw(host->base + MMC_REG_RES_FIFO);
+			cmd->resp[0] = a << 24 | b << 8 | c >> 8;
+		}
+	}
+}
+
+static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
+{
+	u32 stat;
+	unsigned long timeout = jiffies + HZ;
+
+	do {
+		stat = readl(host->base + MMC_REG_STATUS);
+		if (stat & STATUS_ERR_MASK)
+			return stat;
+		if (time_after(jiffies, timeout))
+			return STATUS_TIME_OUT_READ;
+		if (stat & mask)
+			return 0;
+		cpu_relax();
+	} while (1);
+}
+
+static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
+{
+	unsigned int stat;
+	u32 *buf = _buf;
+
+	while (bytes > 3) {
+		stat = mxcmci_poll_status(host,
+				STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
+		if (stat)
+			return stat;
+		*buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS);
+		bytes -= 4;
+	}
+
+	if (bytes) {
+		u8 *b = (u8 *)buf;
+		u32 tmp;
+
+		stat = mxcmci_poll_status(host,
+				STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
+		if (stat)
+			return stat;
+		tmp = readl(host->base + MMC_REG_BUFFER_ACCESS);
+		memcpy(b, &tmp, bytes);
+	}
+
+	return 0;
+}
+
+static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
+{
+	unsigned int stat;
+	u32 *buf = _buf;
+
+	while (bytes > 3) {
+		stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+		if (stat)
+			return stat;
+		writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS);
+		bytes -= 4;
+	}
+
+	if (bytes) {
+		u8 *b = (u8 *)buf;
+		u32 tmp;
+
+		stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+		if (stat)
+			return stat;
+
+		memcpy(&tmp, b, bytes);
+		writel(tmp, host->base + MMC_REG_BUFFER_ACCESS);
+	}
+
+	stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+	if (stat)
+		return stat;
+
+	return 0;
+}
+
+static int mxcmci_transfer_data(struct mxcmci_host *host)
+{
+	struct mmc_data *data = host->req->data;
+	struct scatterlist *sg;
+	int stat, i;
+
+	host->datasize = 0;
+
+	host->data = data;
+	host->datasize = 0;
+
+	if (data->flags & MMC_DATA_READ) {
+		for_each_sg(data->sg, sg, data->sg_len, i) {
+			stat = mxcmci_pull(host, sg_virt(sg), sg->length);
+			if (stat)
+				return stat;
+			host->datasize += sg->length;
+		}
+	} else {
+		for_each_sg(data->sg, sg, data->sg_len, i) {
+			stat = mxcmci_push(host, sg_virt(sg), sg->length);
+			if (stat)
+				return stat;
+			host->datasize += sg->length;
+		}
+		stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
+		if (stat)
+			return stat;
+	}
+	return 0;
+}
+
+static void mxcmci_datawork(struct work_struct *work)
+{
+	struct mxcmci_host *host = container_of(work, struct mxcmci_host,
+						  datawork);
+	int datastat = mxcmci_transfer_data(host);
+	mxcmci_finish_data(host, datastat);
+
+	if (host->req->stop) {
+		if (mxcmci_start_cmd(host, host->req->stop, 0)) {
+			mxcmci_finish_request(host, host->req);
+			return;
+		}
+	} else {
+		mxcmci_finish_request(host, host->req);
+	}
+}
+
+#ifdef HAS_DMA
+static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
+{
+	struct mmc_data *data = host->data;
+	int data_error;
+
+	if (!data)
+		return;
+
+	data_error = mxcmci_finish_data(host, stat);
+
+	mxcmci_read_response(host, stat);
+	host->cmd = NULL;
+
+	if (host->req->stop) {
+		if (mxcmci_start_cmd(host, host->req->stop, 0)) {
+			mxcmci_finish_request(host, host->req);
+			return;
+		}
+	} else {
+		mxcmci_finish_request(host, host->req);
+	}
+}
+#endif /* HAS_DMA */
+
+static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
+{
+	mxcmci_read_response(host, stat);
+	host->cmd = NULL;
+
+	if (!host->data && host->req) {
+		mxcmci_finish_request(host, host->req);
+		return;
+	}
+
+	/* For the DMA case the DMA engine handles the data transfer
+	 * automatically. For non DMA we have to to it ourselves.
+	 * Don't do it in interrupt context though.
+	 */
+	if (!mxcmci_use_dma(host) && host->data)
+		schedule_work(&host->datawork);
+
+}
+
+static irqreturn_t mxcmci_irq(int irq, void *devid)
+{
+	struct mxcmci_host *host = devid;
+	u32 stat;
+
+	stat = readl(host->base + MMC_REG_STATUS);
+	writel(stat, host->base + MMC_REG_STATUS);
+
+	dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
+
+	if (stat & STATUS_END_CMD_RESP)
+		mxcmci_cmd_done(host, stat);
+#ifdef HAS_DMA
+	if (mxcmci_use_dma(host) &&
+		  (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE)))
+		mxcmci_data_done(host, stat);
+#endif
+	return IRQ_HANDLED;
+}
+
+static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
+{
+	struct mxcmci_host *host = mmc_priv(mmc);
+	unsigned int cmdat = host->cmdat;
+
+	WARN_ON(host->req != NULL);
+
+	host->req = req;
+	host->cmdat &= ~CMD_DAT_CONT_INIT;
+#ifdef HAS_DMA
+	host->do_dma = 1;
+#endif
+	if (req->data) {
+		mxcmci_setup_data(host, req->data);
+
+		cmdat |= CMD_DAT_CONT_DATA_ENABLE;
+
+		if (req->data->flags & MMC_DATA_WRITE)
+			cmdat |= CMD_DAT_CONT_WRITE;
+	}
+
+	if (mxcmci_start_cmd(host, req->cmd, cmdat))
+		mxcmci_finish_request(host, req);
+}
+
+static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
+{
+	unsigned int divider;
+	int prescaler = 0;
+	unsigned int clk_in = clk_get_rate(host->clk);
+
+	while (prescaler <= 0x800) {
+		for (divider = 1; divider <= 0xF; divider++) {
+			int x;
+
+			x = (clk_in / (divider + 1));
+
+			if (prescaler)
+				x /= (prescaler * 2);
+
+			if (x <= clk_ios)
+				break;
+		}
+		if (divider < 0x10)
+			break;
+
+		if (prescaler == 0)
+			prescaler = 1;
+		else
+			prescaler <<= 1;
+	}
+
+	writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE);
+
+	dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
+			prescaler, divider, clk_in, clk_ios);
+}
+
+static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct mxcmci_host *host = mmc_priv(mmc);
+#ifdef HAS_DMA
+	unsigned int blen;
+	/*
+	 * use burstlen of 64 in 4 bit mode (--> reg value  0)
+	 * use burstlen of 16 in 1 bit mode (--> reg value 16)
+	 */
+	if (ios->bus_width == MMC_BUS_WIDTH_4)
+		blen = 0;
+	else
+		blen = 16;
+
+	imx_dma_config_burstlen(host->dma, blen);
+#endif
+	if (ios->bus_width == MMC_BUS_WIDTH_4)
+		host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
+	else
+		host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
+
+	if (host->power_mode != ios->power_mode) {
+		if (host->pdata && host->pdata->setpower)
+			host->pdata->setpower(mmc_dev(mmc), ios->vdd);
+		host->power_mode = ios->power_mode;
+		if (ios->power_mode == MMC_POWER_ON)
+			host->cmdat |= CMD_DAT_CONT_INIT;
+	}
+
+	if (ios->clock) {
+		mxcmci_set_clk_rate(host, ios->clock);
+		writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
+	} else {
+		writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
+	}
+
+	host->clock = ios->clock;
+}
+
+static irqreturn_t mxcmci_detect_irq(int irq, void *data)
+{
+	struct mmc_host *mmc = data;
+
+	dev_dbg(mmc_dev(mmc), "%s\n", __func__);
+
+	mmc_detect_change(mmc, msecs_to_jiffies(250));
+	return IRQ_HANDLED;
+}
+
+static int mxcmci_get_ro(struct mmc_host *mmc)
+{
+	struct mxcmci_host *host = mmc_priv(mmc);
+
+	if (host->pdata && host->pdata->get_ro)
+		return !!host->pdata->get_ro(mmc_dev(mmc));
+	/*
+	 * Board doesn't support read only detection; let the mmc core
+	 * decide what to do.
+	 */
+	return -ENOSYS;
+}
+
+
+static const struct mmc_host_ops mxcmci_ops = {
+	.request	= mxcmci_request,
+	.set_ios	= mxcmci_set_ios,
+	.get_ro		= mxcmci_get_ro,
+};
+
+static int mxcmci_probe(struct platform_device *pdev)
+{
+	struct mmc_host *mmc;
+	struct mxcmci_host *host = NULL;
+	struct resource *r;
+	int ret = 0, irq;
+
+	printk(KERN_INFO "i.MX SDHC driver\n");
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (!r || irq < 0)
+		return -EINVAL;
+
+	r = request_mem_region(r->start, resource_size(r), pdev->name);
+	if (!r)
+		return -EBUSY;
+
+	mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev);
+	if (!mmc) {
+		ret = -ENOMEM;
+		goto out_release_mem;
+	}
+
+	mmc->ops = &mxcmci_ops;
+	mmc->caps = MMC_CAP_4_BIT_DATA;
+
+	/* MMC core transfer sizes tunable parameters */
+	mmc->max_hw_segs = 64;
+	mmc->max_phys_segs = 64;
+	mmc->max_blk_size = 2048;
+	mmc->max_blk_count = 65535;
+	mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+	mmc->max_seg_size = mmc->max_seg_size;
+
+	host = mmc_priv(mmc);
+	host->base = ioremap(r->start, resource_size(r));
+	if (!host->base) {
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
+	host->mmc = mmc;
+	host->pdata = pdev->dev.platform_data;
+
+	if (host->pdata && host->pdata->ocr_avail)
+		mmc->ocr_avail = host->pdata->ocr_avail;
+	else
+		mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+	host->res = r;
+	host->irq = irq;
+
+	host->clk = clk_get(&pdev->dev, "sdhc_clk");
+	if (IS_ERR(host->clk)) {
+		ret = PTR_ERR(host->clk);
+		goto out_iounmap;
+	}
+	clk_enable(host->clk);
+
+	mxcmci_softreset(host);
+
+	host->rev_no = readw(host->base + MMC_REG_REV_NO);
+	if (host->rev_no != 0x400) {
+		ret = -ENODEV;
+		dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
+			host->rev_no);
+		goto out_clk_put;
+	}
+
+	mmc->f_min = clk_get_rate(host->clk) >> 7;
+	mmc->f_max = clk_get_rate(host->clk) >> 1;
+
+	/* recommended in data sheet */
+	writew(0x2db4, host->base + MMC_REG_READ_TO);
+
+	writel(0, host->base + MMC_REG_INT_CNTR);
+
+#ifdef HAS_DMA
+	host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW);
+	if (host->dma < 0) {
+		dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
+		ret = -EBUSY;
+		goto out_clk_put;
+	}
+
+	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!r) {
+		ret = -EINVAL;
+		goto out_free_dma;
+	}
+
+	ret = imx_dma_config_channel(host->dma,
+				     IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO,
+				     IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
+				     r->start, 0);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc), "failed to config DMA channel\n");
+		goto out_free_dma;
+	}
+#endif
+	INIT_WORK(&host->datawork, mxcmci_datawork);
+
+	ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host);
+	if (ret)
+		goto out_free_dma;
+
+	platform_set_drvdata(pdev, mmc);
+
+	if (host->pdata && host->pdata->init) {
+		ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
+				host->mmc);
+		if (ret)
+			goto out_free_irq;
+	}
+
+	mmc_add_host(mmc);
+
+	return 0;
+
+out_free_irq:
+	free_irq(host->irq, host);
+out_free_dma:
+#ifdef HAS_DMA
+	imx_dma_free(host->dma);
+#endif
+out_clk_put:
+	clk_disable(host->clk);
+	clk_put(host->clk);
+out_iounmap:
+	iounmap(host->base);
+out_free:
+	mmc_free_host(mmc);
+out_release_mem:
+	release_mem_region(host->res->start, resource_size(host->res));
+	return ret;
+}
+
+static int mxcmci_remove(struct platform_device *pdev)
+{
+	struct mmc_host *mmc = platform_get_drvdata(pdev);
+	struct mxcmci_host *host = mmc_priv(mmc);
+
+	platform_set_drvdata(pdev, NULL);
+
+	mmc_remove_host(mmc);
+
+	if (host->pdata && host->pdata->exit)
+		host->pdata->exit(&pdev->dev, mmc);
+
+	free_irq(host->irq, host);
+	iounmap(host->base);
+#ifdef HAS_DMA
+	imx_dma_free(host->dma);
+#endif
+	clk_disable(host->clk);
+	clk_put(host->clk);
+
+	release_mem_region(host->res->start, resource_size(host->res));
+	release_resource(host->res);
+
+	mmc_free_host(mmc);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int mxcmci_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct mmc_host *mmc = platform_get_drvdata(dev);
+	int ret = 0;
+
+	if (mmc)
+		ret = mmc_suspend_host(mmc, state);
+
+	return ret;
+}
+
+static int mxcmci_resume(struct platform_device *dev)
+{
+	struct mmc_host *mmc = platform_get_drvdata(dev);
+	struct mxcmci_host *host;
+	int ret = 0;
+
+	if (mmc) {
+		host = mmc_priv(mmc);
+		ret = mmc_resume_host(mmc);
+	}
+
+	return ret;
+}
+#else
+#define mxcmci_suspend  NULL
+#define mxcmci_resume   NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver mxcmci_driver = {
+	.probe		= mxcmci_probe,
+	.remove		= mxcmci_remove,
+	.suspend	= mxcmci_suspend,
+	.resume		= mxcmci_resume,
+	.driver		= {
+		.name		= DRIVER_NAME,
+		.owner		= THIS_MODULE,
+	}
+};
+
+static int __init mxcmci_init(void)
+{
+	return platform_driver_register(&mxcmci_driver);
+}
+
+static void __exit mxcmci_exit(void)
+{
+	platform_driver_unregister(&mxcmci_driver);
+}
+
+module_init(mxcmci_init);
+module_exit(mxcmci_exit);
+
+MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx-mmc");