diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c
index 537d6c7..28393dc 100644
--- a/drivers/mmc/host/jz4740_mmc.c
+++ b/drivers/mmc/host/jz4740_mmc.c
@@ -30,7 +30,9 @@
 #include <asm/mach-jz4740/gpio.h>
 #include <asm/cacheflush.h>
 #include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
 
+#include <asm/mach-jz4740/dma.h>
 #include <asm/mach-jz4740/jz4740_mmc.h>
 
 #define JZ_REG_MMC_STRPCL	0x00
@@ -122,6 +124,7 @@ struct jz4740_mmc_host {
 	int card_detect_irq;
 
 	void __iomem *base;
+	struct resource *mem_res;
 	struct mmc_request *req;
 	struct mmc_command *cmd;
 
@@ -136,8 +139,132 @@ struct jz4740_mmc_host {
 	struct timer_list timeout_timer;
 	struct sg_mapping_iter miter;
 	enum jz4740_mmc_state state;
+
+	/* DMA support */
+	struct dma_chan *dma_rx;
+	struct dma_chan *dma_tx;
+	unsigned int sg_len;
+	bool use_dma;
+
+/* The DMA trigger level is 8 words, that is to say, the DMA read
+ * trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
+ * trigger is when data words in MSC_TXFIFO is < 8.
+ */
+#define JZ4740_MMC_FIFO_HALF_SIZE 8
 };
 
+/*----------------------------------------------------------------------------*/
+/* DMA infrastructure */
+
+static void jz4740_release_dma_channels(struct jz4740_mmc_host *host)
+{
+	if (!host->use_dma)
+		return;
+
+	dma_release_channel(host->dma_tx);
+	dma_release_channel(host->dma_rx);
+}
+
+static int jz4740_acquire_dma_channels(struct jz4740_mmc_host *host)
+{
+	dma_cap_mask_t mask;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	host->dma_tx = dma_request_channel(mask, NULL, host);
+	if (!host->dma_tx) {
+		dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
+		return -ENODEV;
+	}
+
+	host->dma_rx = dma_request_channel(mask, NULL, host);
+	if (!host->dma_rx) {
+		dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
+		goto free_master_write;
+	}
+
+	return 0;
+
+free_master_write:
+	dma_release_channel(host->dma_tx);
+	return -ENODEV;
+}
+
+static inline int jz4740_get_dma_dir(struct mmc_data *data)
+{
+	return (data->flags & MMC_DATA_READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+}
+
+static void jz4740_dma_unmap(struct jz4740_mmc_host *host,
+			     struct mmc_data *data)
+{
+	enum dma_data_direction dir = jz4740_get_dma_dir(data);
+
+	dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, dir);
+}
+
+static int jz4740_start_dma_transfer(struct jz4740_mmc_host *host,
+				     struct mmc_data *data)
+{
+	struct dma_chan *chan;
+	struct dma_async_tx_descriptor *desc;
+	struct dma_slave_config conf = {
+		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
+		.dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
+	};
+	enum dma_data_direction dir = jz4740_get_dma_dir(data);
+
+	host->sg_len = dma_map_sg(mmc_dev(host->mmc),
+				  data->sg,
+				  data->sg_len,
+				  dir);
+
+	if (host->sg_len < 0) {
+		dev_err(mmc_dev(host->mmc),
+			 "Failed to map scatterlist for DMA operation\n");
+		return -EINVAL;
+	}
+
+	if (dir == DMA_TO_DEVICE) {
+		conf.direction = DMA_MEM_TO_DEV;
+		conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
+		conf.slave_id = JZ4740_DMA_TYPE_MMC_TRANSMIT;
+		chan = host->dma_tx;
+	} else {
+		conf.direction = DMA_DEV_TO_MEM;
+		conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
+		conf.slave_id = JZ4740_DMA_TYPE_MMC_RECEIVE;
+		chan = host->dma_rx;
+	}
+
+	dmaengine_slave_config(chan, &conf);
+	desc = dmaengine_prep_slave_sg(chan,
+				       data->sg,
+				       host->sg_len,
+				       conf.direction,
+				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!desc) {
+		dev_err(mmc_dev(host->mmc),
+			 "Failed to allocate DMA %s descriptor",
+			 conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
+		goto dma_unmap;
+	}
+
+	dmaengine_submit(desc);
+	dma_async_issue_pending(chan);
+
+	return 0;
+
+dma_unmap:
+	jz4740_dma_unmap(host, data);
+	return -ENOMEM;
+}
+
+/*----------------------------------------------------------------------------*/
+
 static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
 	unsigned int irq, bool enabled)
 {
@@ -442,6 +569,8 @@ static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
 			cmdat |= JZ_MMC_CMDAT_WRITE;
 		if (cmd->data->flags & MMC_DATA_STREAM)
 			cmdat |= JZ_MMC_CMDAT_STREAM;
+		if (host->use_dma)
+			cmdat |= JZ_MMC_CMDAT_DMA_EN;
 
 		writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
 		writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
@@ -465,6 +594,7 @@ static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
 	else
 		direction = SG_MITER_FROM_SG;
 
+
 	sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
 }
 
@@ -474,6 +604,7 @@ static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
 	struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
 	struct mmc_command *cmd = host->req->cmd;
 	struct mmc_request *req = host->req;
+	struct mmc_data *data = cmd->data;
 	bool timeout = false;
 
 	if (cmd->error)
@@ -484,23 +615,32 @@ static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
 		if (cmd->flags & MMC_RSP_PRESENT)
 			jz4740_mmc_read_response(host, cmd);
 
-		if (!cmd->data)
+		if (!data)
 			break;
 
 		jz_mmc_prepare_data_transfer(host);
 
 	case JZ4740_MMC_STATE_TRANSFER_DATA:
-		if (cmd->data->flags & MMC_DATA_READ)
-			timeout = jz4740_mmc_read_data(host, cmd->data);
+		if (host->use_dma) {
+			/* Use DMA if enabled, data transfer direction was
+			 * defined  before in jz_mmc_prepare_data_transfer().
+			 */
+			timeout = jz4740_start_dma_transfer(host, data);
+			data->bytes_xfered = data->blocks * data->blksz;
+		} else if (data->flags & MMC_DATA_READ)
+			/* If DMA is not enabled, rely on data flags
+			 * to establish data transfer direction.
+			 */
+			timeout = jz4740_mmc_read_data(host, data);
 		else
-			timeout = jz4740_mmc_write_data(host, cmd->data);
+			timeout = jz4740_mmc_write_data(host, data);
 
 		if (unlikely(timeout)) {
 			host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
 			break;
 		}
 
-		jz4740_mmc_transfer_check_state(host, cmd->data);
+		jz4740_mmc_transfer_check_state(host, data);
 
 		timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
 		if (unlikely(timeout)) {
@@ -757,7 +897,6 @@ static int jz4740_mmc_probe(struct platform_device* pdev)
 	struct mmc_host *mmc;
 	struct jz4740_mmc_host *host;
 	struct jz4740_mmc_platform_data *pdata;
-	struct resource *res;
 
 	pdata = pdev->dev.platform_data;
 
@@ -784,10 +923,17 @@ static int jz4740_mmc_probe(struct platform_device* pdev)
 		goto err_free_host;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	host->base = devm_ioremap_resource(&pdev->dev, res);
+	host->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!host->mem_res) {
+		ret = -EBUSY;
+		dev_err(&pdev->dev, "Failed to request memory region\n");
+		goto err_free_host;
+	}
+
+	host->base = devm_ioremap_resource(&pdev->dev, host->mem_res);
 	if (IS_ERR(host->base)) {
 		ret = PTR_ERR(host->base);
+		dev_err(&pdev->dev, "Failed to ioremap base memory\n");
 		goto err_free_host;
 	}
 
@@ -834,6 +980,10 @@ static int jz4740_mmc_probe(struct platform_device* pdev)
 	/* It is not important when it times out, it just needs to timeout. */
 	set_timer_slack(&host->timeout_timer, HZ);
 
+	host->use_dma = true;
+	if (host->use_dma && jz4740_acquire_dma_channels(host) != 0)
+		host->use_dma = false;
+
 	platform_set_drvdata(pdev, host);
 	ret = mmc_add_host(mmc);
 
@@ -843,6 +993,10 @@ static int jz4740_mmc_probe(struct platform_device* pdev)
 	}
 	dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
 
+	dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
+		 host->use_dma ? "DMA" : "PIO",
+		 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
+
 	return 0;
 
 err_free_irq:
@@ -850,6 +1004,8 @@ err_free_irq:
 err_free_gpios:
 	jz4740_mmc_free_gpios(pdev);
 err_gpio_bulk_free:
+	if (host->use_dma)
+		jz4740_release_dma_channels(host);
 	jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
 err_free_host:
 	mmc_free_host(mmc);
@@ -871,6 +1027,7 @@ static int jz4740_mmc_remove(struct platform_device *pdev)
 
 	jz4740_mmc_free_gpios(pdev);
 	jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+	jz4740_release_dma_channels(host);
 
 	mmc_free_host(host->mmc);
 
