Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (83 commits)
  mmc: fix compile error when CONFIG_BLOCK is not enabled
  mmc: core: Cleanup eMMC4.5 conditionals
  mmc: omap_hsmmc: if multiblock reads are broken, disable them
  mmc: core: add workaround for controllers with broken multiblock reads
  mmc: core: Prevent too long response times for suspend
  mmc: recognise SDIO cards with SDIO_CCCR_REV 3.00
  mmc: sd: Handle SD3.0 cards not supporting UHS-I bus speed mode
  mmc: core: support HPI send command
  mmc: core: Add cache control for eMMC4.5 device
  mmc: core: Modify the timeout value for writing power class
  mmc: core: new discard feature support at eMMC v4.5
  mmc: core: mmc sanitize feature support for v4.5
  mmc: dw_mmc: modify DATA register offset
  mmc: sdhci-pci: add flag for devices that can support runtime PM
  mmc: omap_hsmmc: ensure pbias configuration is always done
  mmc: core: Add Power Off Notify Feature eMMC 4.5
  mmc: sdhci-s3c: fix potential NULL dereference
  mmc: replace printk with appropriate display macro
  mmc: core: Add default timeout value for CMD6
  mmc: sdhci-pci: add runtime pm support
  ...

1 files changed, 558 insertions, 265 deletions

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index fa8cae1d700..a7ee5027146 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -30,6 +30,7 @@
 
 #include <mach/atmel-mci.h>
 #include <linux/atmel-mci.h>
+#include <linux/atmel_pdc.h>
 
 #include <asm/io.h>
 #include <asm/unaligned.h>
@@ -39,7 +40,7 @@
 
 #include "atmel-mci-regs.h"
 
-#define ATMCI_DATA_ERROR_FLAGS	(MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE)
+#define ATMCI_DATA_ERROR_FLAGS	(ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
 #define ATMCI_DMA_THRESHOLD	16
 
 enum {
@@ -58,18 +59,35 @@ enum atmel_mci_state {
 	STATE_DATA_ERROR,
 };
 
+enum atmci_xfer_dir {
+	XFER_RECEIVE = 0,
+	XFER_TRANSMIT,
+};
+
+enum atmci_pdc_buf {
+	PDC_FIRST_BUF = 0,
+	PDC_SECOND_BUF,
+};
+
+struct atmel_mci_caps {
+	bool    has_dma;
+	bool    has_pdc;
+	bool    has_cfg_reg;
+	bool    has_cstor_reg;
+	bool    has_highspeed;
+	bool    has_rwproof;
+};
+
 struct atmel_mci_dma {
-#ifdef CONFIG_MMC_ATMELMCI_DMA
 	struct dma_chan			*chan;
 	struct dma_async_tx_descriptor	*data_desc;
-#endif
 };
 
 /**
  * struct atmel_mci - MMC controller state shared between all slots
  * @lock: Spinlock protecting the queue and associated data.
  * @regs: Pointer to MMIO registers.
- * @sg: Scatterlist entry currently being processed by PIO code, if any.
+ * @sg: Scatterlist entry currently being processed by PIO or PDC code.
  * @pio_offset: Offset into the current scatterlist entry.
  * @cur_slot: The slot which is currently using the controller.
  * @mrq: The request currently being processed on @cur_slot,
@@ -77,6 +95,7 @@ struct atmel_mci_dma {
  * @cmd: The command currently being sent to the card, or NULL.
  * @data: The data currently being transferred, or NULL if no data
  *	transfer is in progress.
+ * @data_size: just data->blocks * data->blksz.
  * @dma: DMA client state.
  * @data_chan: DMA channel being used for the current data transfer.
  * @cmd_status: Snapshot of SR taken upon completion of the current
@@ -103,6 +122,13 @@ struct atmel_mci_dma {
  * @mck: The peripheral bus clock hooked up to the MMC controller.
  * @pdev: Platform device associated with the MMC controller.
  * @slot: Slots sharing this MMC controller.
+ * @caps: MCI capabilities depending on MCI version.
+ * @prepare_data: function to setup MCI before data transfer which
+ * depends on MCI capabilities.
+ * @submit_data: function to start data transfer which depends on MCI
+ * capabilities.
+ * @stop_transfer: function to stop data transfer which depends on MCI
+ * capabilities.
  *
  * Locking
  * =======
@@ -143,6 +169,7 @@ struct atmel_mci {
 	struct mmc_request	*mrq;
 	struct mmc_command	*cmd;
 	struct mmc_data		*data;
+	unsigned int		data_size;
 
 	struct atmel_mci_dma	dma;
 	struct dma_chan		*data_chan;
@@ -166,7 +193,13 @@ struct atmel_mci {
 	struct clk		*mck;
 	struct platform_device	*pdev;
 
-	struct atmel_mci_slot	*slot[ATMEL_MCI_MAX_NR_SLOTS];
+	struct atmel_mci_slot	*slot[ATMCI_MAX_NR_SLOTS];
+
+	struct atmel_mci_caps   caps;
+
+	u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
+	void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
+	void (*stop_transfer)(struct atmel_mci *host);
 };
 
 /**
@@ -220,31 +253,6 @@ struct atmel_mci_slot {
 	set_bit(event, &host->pending_events)
 
 /*
- * Enable or disable features/registers based on
- * whether the processor supports them
- */
-static bool mci_has_rwproof(void)
-{
-	if (cpu_is_at91sam9261() || cpu_is_at91rm9200())
-		return false;
-	else
-		return true;
-}
-
-/*
- * The new MCI2 module isn't 100% compatible with the old MCI module,
- * and it has a few nice features which we want to use...
- */
-static inline bool atmci_is_mci2(void)
-{
-	if (cpu_is_at91sam9g45())
-		return true;
-
-	return false;
-}
-
-
-/*
  * The debugfs stuff below is mostly optimized away when
  * CONFIG_DEBUG_FS is not set.
  */
@@ -352,7 +360,7 @@ static int atmci_regs_show(struct seq_file *s, void *v)
 	struct atmel_mci	*host = s->private;
 	u32			*buf;
 
-	buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL);
+	buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
@@ -363,47 +371,50 @@ static int atmci_regs_show(struct seq_file *s, void *v)
 	 */
 	spin_lock_bh(&host->lock);
 	clk_enable(host->mck);
-	memcpy_fromio(buf, host->regs, MCI_REGS_SIZE);
+	memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
 	clk_disable(host->mck);
 	spin_unlock_bh(&host->lock);
 
 	seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
-			buf[MCI_MR / 4],
-			buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "",
-			buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "",
-			buf[MCI_MR / 4] & 0xff);
-	seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]);
-	seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]);
-	seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]);
+			buf[ATMCI_MR / 4],
+			buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
+			buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "",
+			buf[ATMCI_MR / 4] & 0xff);
+	seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
+	seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
+	seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
 	seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
-			buf[MCI_BLKR / 4],
-			buf[MCI_BLKR / 4] & 0xffff,
-			(buf[MCI_BLKR / 4] >> 16) & 0xffff);
-	if (atmci_is_mci2())
-		seq_printf(s, "CSTOR:\t0x%08x\n", buf[MCI_CSTOR / 4]);
+			buf[ATMCI_BLKR / 4],
+			buf[ATMCI_BLKR / 4] & 0xffff,
+			(buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
+	if (host->caps.has_cstor_reg)
+		seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
 
 	/* Don't read RSPR and RDR; it will consume the data there */
 
-	atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]);
-	atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]);
+	atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
+	atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
 
-	if (atmci_is_mci2()) {
+	if (host->caps.has_dma) {
 		u32 val;
 
-		val = buf[MCI_DMA / 4];
+		val = buf[ATMCI_DMA / 4];
 		seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
 				val, val & 3,
 				((val >> 4) & 3) ?
 					1 << (((val >> 4) & 3) + 1) : 1,
-				val & MCI_DMAEN ? " DMAEN" : "");
+				val & ATMCI_DMAEN ? " DMAEN" : "");
+	}
+	if (host->caps.has_cfg_reg) {
+		u32 val;
 
-		val = buf[MCI_CFG / 4];
+		val = buf[ATMCI_CFG / 4];
 		seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
 				val,
-				val & MCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
-				val & MCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
-				val & MCI_CFG_HSMODE ? " HSMODE" : "",
-				val & MCI_CFG_LSYNC ? " LSYNC" : "");
+				val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
+				val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
+				val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
+				val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
 	}
 
 	kfree(buf);
@@ -466,7 +477,7 @@ err:
 	dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
 }
 
-static inline unsigned int ns_to_clocks(struct atmel_mci *host,
+static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
 					unsigned int ns)
 {
 	return (ns * (host->bus_hz / 1000000) + 999) / 1000;
@@ -482,7 +493,8 @@ static void atmci_set_timeout(struct atmel_mci *host,
 	unsigned	dtocyc;
 	unsigned	dtomul;
 
-	timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks;
+	timeout = atmci_ns_to_clocks(host, data->timeout_ns)
+		+ data->timeout_clks;
 
 	for (dtomul = 0; dtomul < 8; dtomul++) {
 		unsigned shift = dtomul_to_shift[dtomul];
@@ -498,7 +510,7 @@ static void atmci_set_timeout(struct atmel_mci *host,
 
 	dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
 			dtocyc << dtomul_to_shift[dtomul]);
-	mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc)));
+	atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
 }
 
 /*
@@ -512,13 +524,13 @@ static u32 atmci_prepare_command(struct mmc_host *mmc,
 
 	cmd->error = -EINPROGRESS;
 
-	cmdr = MCI_CMDR_CMDNB(cmd->opcode);
+	cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
 
 	if (cmd->flags & MMC_RSP_PRESENT) {
 		if (cmd->flags & MMC_RSP_136)
-			cmdr |= MCI_CMDR_RSPTYP_136BIT;
+			cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
 		else
-			cmdr |= MCI_CMDR_RSPTYP_48BIT;
+			cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
 	}
 
 	/*
@@ -526,34 +538,34 @@ static u32 atmci_prepare_command(struct mmc_host *mmc,
 	 * it's too difficult to determine whether this is an ACMD or
 	 * not. Better make it 64.
 	 */
-	cmdr |= MCI_CMDR_MAXLAT_64CYC;
+	cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
 
 	if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
-		cmdr |= MCI_CMDR_OPDCMD;
+		cmdr |= ATMCI_CMDR_OPDCMD;
 
 	data = cmd->data;
 	if (data) {
-		cmdr |= MCI_CMDR_START_XFER;
+		cmdr |= ATMCI_CMDR_START_XFER;
 
 		if (cmd->opcode == SD_IO_RW_EXTENDED) {
-			cmdr |= MCI_CMDR_SDIO_BLOCK;
+			cmdr |= ATMCI_CMDR_SDIO_BLOCK;
 		} else {
 			if (data->flags & MMC_DATA_STREAM)
-				cmdr |= MCI_CMDR_STREAM;
+				cmdr |= ATMCI_CMDR_STREAM;
 			else if (data->blocks > 1)
-				cmdr |= MCI_CMDR_MULTI_BLOCK;
+				cmdr |= ATMCI_CMDR_MULTI_BLOCK;
 			else
-				cmdr |= MCI_CMDR_BLOCK;
+				cmdr |= ATMCI_CMDR_BLOCK;
 		}
 
 		if (data->flags & MMC_DATA_READ)
-			cmdr |= MCI_CMDR_TRDIR_READ;
+			cmdr |= ATMCI_CMDR_TRDIR_READ;
 	}
 
 	return cmdr;
 }
 
-static void atmci_start_command(struct atmel_mci *host,
+static void atmci_send_command(struct atmel_mci *host,
 		struct mmc_command *cmd, u32 cmd_flags)
 {
 	WARN_ON(host->cmd);
@@ -563,43 +575,119 @@ static void atmci_start_command(struct atmel_mci *host,
 			"start command: ARGR=0x%08x CMDR=0x%08x\n",
 			cmd->arg, cmd_flags);
 
-	mci_writel(host, ARGR, cmd->arg);
-	mci_writel(host, CMDR, cmd_flags);
+	atmci_writel(host, ATMCI_ARGR, cmd->arg);
+	atmci_writel(host, ATMCI_CMDR, cmd_flags);
 }
 
-static void send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
+static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
 {
-	atmci_start_command(host, data->stop, host->stop_cmdr);
-	mci_writel(host, IER, MCI_CMDRDY);
+	atmci_send_command(host, data->stop, host->stop_cmdr);
+	atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
 }
 
-#ifdef CONFIG_MMC_ATMELMCI_DMA
-static void atmci_dma_cleanup(struct atmel_mci *host)
+/*
+ * Configure given PDC buffer taking care of alignement issues.
+ * Update host->data_size and host->sg.
+ */
+static void atmci_pdc_set_single_buf(struct atmel_mci *host,
+	enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
+{
+	u32 pointer_reg, counter_reg;
+
+	if (dir == XFER_RECEIVE) {
+		pointer_reg = ATMEL_PDC_RPR;
+		counter_reg = ATMEL_PDC_RCR;
+	} else {
+		pointer_reg = ATMEL_PDC_TPR;
+		counter_reg = ATMEL_PDC_TCR;
+	}
+
+	if (buf_nb == PDC_SECOND_BUF) {
+		pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
+		counter_reg += ATMEL_PDC_SCND_BUF_OFF;
+	}
+
+	atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
+	if (host->data_size <= sg_dma_len(host->sg)) {
+		if (host->data_size & 0x3) {
+			/* If size is different from modulo 4, transfer bytes */
+			atmci_writel(host, counter_reg, host->data_size);
+			atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
+		} else {
+			/* Else transfer 32-bits words */
+			atmci_writel(host, counter_reg, host->data_size / 4);
+		}
+		host->data_size = 0;
+	} else {
+		/* We assume the size of a page is 32-bits aligned */
+		atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
+		host->data_size -= sg_dma_len(host->sg);
+		if (host->data_size)
+			host->sg = sg_next(host->sg);
+	}
+}
+
+/*
+ * Configure PDC buffer according to the data size ie configuring one or two
+ * buffers. Don't use this function if you want to configure only the second
+ * buffer. In this case, use atmci_pdc_set_single_buf.
+ */
+static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
 {
-	struct mmc_data			*data = host->data;
+	atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
+	if (host->data_size)
+		atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
+}
+
+/*
+ * Unmap sg lists, called when transfer is finished.
+ */
+static void atmci_pdc_cleanup(struct atmel_mci *host)
+{
+	struct mmc_data         *data = host->data;
 
 	if (data)
-		dma_unmap_sg(host->dma.chan->device->dev,
-			     data->sg, data->sg_len,
-			     ((data->flags & MMC_DATA_WRITE)
-			      ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+		dma_unmap_sg(&host->pdev->dev,
+				data->sg, data->sg_len,
+				((data->flags & MMC_DATA_WRITE)
+				 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
 }
 
-static void atmci_stop_dma(struct atmel_mci *host)
+/*
+ * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
+ * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
+ * interrupt needed for both transfer directions.
+ */
+static void atmci_pdc_complete(struct atmel_mci *host)
 {
-	struct dma_chan *chan = host->data_chan;
+	atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
+	atmci_pdc_cleanup(host);
 
-	if (chan) {
-		dmaengine_terminate_all(chan);
-		atmci_dma_cleanup(host);
-	} else {
-		/* Data transfer was stopped by the interrupt handler */
+	/*
+	 * If the card was removed, data will be NULL. No point trying
+	 * to send the stop command or waiting for NBUSY in this case.
+	 */
+	if (host->data) {
 		atmci_set_pending(host, EVENT_XFER_COMPLETE);
-		mci_writel(host, IER, MCI_NOTBUSY);
+		tasklet_schedule(&host->tasklet);
+		atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 	}
 }
 
-/* This function is called by the DMA driver from tasklet context. */
+static void atmci_dma_cleanup(struct atmel_mci *host)
+{
+	struct mmc_data                 *data = host->data;
+
+	if (data)
+		dma_unmap_sg(host->dma.chan->device->dev,
+				data->sg, data->sg_len,
+				((data->flags & MMC_DATA_WRITE)
+				 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+}
+
+/*
+ * This function is called by the DMA driver from tasklet context.
+ */
 static void atmci_dma_complete(void *arg)
 {
 	struct atmel_mci	*host = arg;
@@ -607,9 +695,9 @@ static void atmci_dma_complete(void *arg)
 
 	dev_vdbg(&host->pdev->dev, "DMA complete\n");
 
-	if (atmci_is_mci2())
+	if (host->caps.has_dma)
 		/* Disable DMA hardware handshaking on MCI */
-		mci_writel(host, DMA, mci_readl(host, DMA) & ~MCI_DMAEN);
+		atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
 
 	atmci_dma_cleanup(host);
 
@@ -641,11 +729,93 @@ static void atmci_dma_complete(void *arg)
 		 * completion callback" rule of the dma engine
 		 * framework.
 		 */
-		mci_writel(host, IER, MCI_NOTBUSY);
+		atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 	}
 }
 
-static int
+/*
+ * Returns a mask of interrupt flags to be enabled after the whole
+ * request has been prepared.
+ */
+static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
+{
+	u32 iflags;
+
+	data->error = -EINPROGRESS;
+
+	host->sg = data->sg;
+	host->data = data;
+	host->data_chan = NULL;
+
+	iflags = ATMCI_DATA_ERROR_FLAGS;
+
+	/*
+	 * Errata: MMC data write operation with less than 12
+	 * bytes is impossible.
+	 *
+	 * Errata: MCI Transmit Data Register (TDR) FIFO
+	 * corruption when length is not multiple of 4.
+	 */
+	if (data->blocks * data->blksz < 12
+			|| (data->blocks * data->blksz) & 3)
+		host->need_reset = true;
+
+	host->pio_offset = 0;
+	if (data->flags & MMC_DATA_READ)
+		iflags |= ATMCI_RXRDY;
+	else
+		iflags |= ATMCI_TXRDY;
+
+	return iflags;
+}
+
+/*
+ * Set interrupt flags and set block length into the MCI mode register even
+ * if this value is also accessible in the MCI block register. It seems to be
+ * necessary before the High Speed MCI version. It also map sg and configure
+ * PDC registers.
+ */
+static u32
+atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
+{
+	u32 iflags, tmp;
+	unsigned int sg_len;
+	enum dma_data_direction dir;
+
+	data->error = -EINPROGRESS;
+
+	host->data = data;
+	host->sg = data->sg;
+	iflags = ATMCI_DATA_ERROR_FLAGS;
+
+	/* Enable pdc mode */
+	atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
+
+	if (data->flags & MMC_DATA_READ) {
+		dir = DMA_FROM_DEVICE;
+		iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
+	} else {
+		dir = DMA_TO_DEVICE;
+		iflags |= ATMCI_ENDTX | ATMCI_TXBUFE;
+	}
+
+	/* Set BLKLEN */
+	tmp = atmci_readl(host, ATMCI_MR);
+	tmp &= 0x0000ffff;
+	tmp |= ATMCI_BLKLEN(data->blksz);
+	atmci_writel(host, ATMCI_MR, tmp);
+
+	/* Configure PDC */
+	host->data_size = data->blocks * data->blksz;
+	sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
+	if (host->data_size)
+		atmci_pdc_set_both_buf(host,
+			((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
+
+	return iflags;
+}
+
+static u32
 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 {
 	struct dma_chan			*chan;
@@ -654,6 +824,15 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 	unsigned int			i;
 	enum dma_data_direction		direction;
 	unsigned int			sglen;
+	u32 iflags;
+
+	data->error = -EINPROGRESS;
+
+	WARN_ON(host->data);
+	host->sg = NULL;
+	host->data = data;
+
+	iflags = ATMCI_DATA_ERROR_FLAGS;
 
 	/*
 	 * We don't do DMA on "complex" transfers, i.e. with
@@ -661,13 +840,13 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 	 * with all the DMA setup overhead for short transfers.
 	 */
 	if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
-		return -EINVAL;
+		return atmci_prepare_data(host, data);
 	if (data->blksz & 3)
-		return -EINVAL;
+		return atmci_prepare_data(host, data);
 
 	for_each_sg(data->sg, sg, data->sg_len, i) {
 		if (sg->offset & 3 || sg->length & 3)
-			return -EINVAL;
+			return atmci_prepare_data(host, data);
 	}
 
 	/* If we don't have a channel, we can't do DMA */
@@ -678,8 +857,8 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 	if (!chan)
 		return -ENODEV;
 
-	if (atmci_is_mci2())
-		mci_writel(host, DMA, MCI_DMA_CHKSIZE(3) | MCI_DMAEN);
+	if (host->caps.has_dma)
+		atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
 
 	if (data->flags & MMC_DATA_READ)
 		direction = DMA_FROM_DEVICE;
@@ -687,7 +866,7 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 		direction = DMA_TO_DEVICE;
 
 	sglen = dma_map_sg(chan->device->dev, data->sg,
-			   data->sg_len, direction);
+			data->sg_len, direction);
 
 	desc = chan->device->device_prep_slave_sg(chan,
 			data->sg, sglen, direction,
@@ -699,13 +878,32 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 	desc->callback = atmci_dma_complete;
 	desc->callback_param = host;
 
-	return 0;
+	return iflags;
 unmap_exit:
 	dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
 	return -ENOMEM;
 }
 
-static void atmci_submit_data(struct atmel_mci *host)
+static void
+atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
+{
+	return;
+}
+
+/*
+ * Start PDC according to transfer direction.
+ */
+static void
+atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
+{
+	if (data->flags & MMC_DATA_READ)
+		atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
+	else
+		atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
+}
+
+static void
+atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
 {
 	struct dma_chan			*chan = host->data_chan;
 	struct dma_async_tx_descriptor	*desc = host->dma.data_desc;
@@ -716,64 +914,39 @@ static void atmci_submit_data(struct atmel_mci *host)
 	}
 }
 
-#else /* CONFIG_MMC_ATMELMCI_DMA */
-
-static int atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
-{
-	return -ENOSYS;
-}
-
-static void atmci_submit_data(struct atmel_mci *host) {}
-
-static void atmci_stop_dma(struct atmel_mci *host)
+static void atmci_stop_transfer(struct atmel_mci *host)
 {
-	/* Data transfer was stopped by the interrupt handler */
 	atmci_set_pending(host, EVENT_XFER_COMPLETE);
-	mci_writel(host, IER, MCI_NOTBUSY);
+	atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 }
 
-#endif /* CONFIG_MMC_ATMELMCI_DMA */
-
 /*
- * Returns a mask of interrupt flags to be enabled after the whole
- * request has been prepared.
+ * Stop data transfer because error(s) occured.
  */
-static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
+static void atmci_stop_transfer_pdc(struct atmel_mci *host)
 {
-	u32 iflags;
-
-	data->error = -EINPROGRESS;
-
-	WARN_ON(host->data);
-	host->sg = NULL;
-	host->data = data;
-
-	iflags = ATMCI_DATA_ERROR_FLAGS;
-	if (atmci_prepare_data_dma(host, data)) {
-		host->data_chan = NULL;
+	atmci_set_pending(host, EVENT_XFER_COMPLETE);
+	atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
+}
 
-		/*
-		 * Errata: MMC data write operation with less than 12
-		 * bytes is impossible.
-		 *
-		 * Errata: MCI Transmit Data Register (TDR) FIFO
-		 * corruption when length is not multiple of 4.
-		 */
-		if (data->blocks * data->blksz < 12
-				|| (data->blocks * data->blksz) & 3)
-			host->need_reset = true;
+static void atmci_stop_transfer_dma(struct atmel_mci *host)
+{
+	struct dma_chan *chan = host->data_chan;
 
-		host->sg = data->sg;
-		host->pio_offset = 0;
-		if (data->flags & MMC_DATA_READ)
-			iflags |= MCI_RXRDY;
-		else
-			iflags |= MCI_TXRDY;
+	if (chan) {
+		dmaengine_terminate_all(chan);
+		atmci_dma_cleanup(host);
+	} else {
+		/* Data transfer was stopped by the interrupt handler */
+		atmci_set_pending(host, EVENT_XFER_COMPLETE);
+		atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 	}
-
-	return iflags;
 }
 
+/*
+ * Start a request: prepare data if needed, prepare the command and activate
+ * interrupts.
+ */
 static void atmci_start_request(struct atmel_mci *host,
 		struct atmel_mci_slot *slot)
 {
@@ -792,24 +965,24 @@ static void atmci_start_request(struct atmel_mci *host,
 	host->data_status = 0;
 
 	if (host->need_reset) {
-		mci_writel(host, CR, MCI_CR_SWRST);
-		mci_writel(host, CR, MCI_CR_MCIEN);
-		mci_writel(host, MR, host->mode_reg);
-		if (atmci_is_mci2())
-			mci_writel(host, CFG, host->cfg_reg);
+		atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
+		atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
+		atmci_writel(host, ATMCI_MR, host->mode_reg);
+		if (host->caps.has_cfg_reg)
+			atmci_writel(host, ATMCI_CFG, host->cfg_reg);
 		host->need_reset = false;
 	}
-	mci_writel(host, SDCR, slot->sdc_reg);
+	atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
 
-	iflags = mci_readl(host, IMR);
-	if (iflags & ~(MCI_SDIOIRQA | MCI_SDIOIRQB))
+	iflags = atmci_readl(host, ATMCI_IMR);
+	if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
 		dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
 				iflags);
 
 	if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
 		/* Send init sequence (74 clock cycles) */
-		mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT);
-		while (!(mci_readl(host, SR) & MCI_CMDRDY))
+		atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
+		while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
 			cpu_relax();
 	}
 	iflags = 0;
@@ -818,31 +991,31 @@ static void atmci_start_request(struct atmel_mci *host,
 		atmci_set_timeout(host, slot, data);
 
 		/* Must set block count/size before sending command */
-		mci_writel(host, BLKR, MCI_BCNT(data->blocks)
-				| MCI_BLKLEN(data->blksz));
+		atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
+				| ATMCI_BLKLEN(data->blksz));
 		dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
-			MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz));
+			ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
 
-		iflags |= atmci_prepare_data(host, data);
+		iflags |= host->prepare_data(host, data);
 	}
 
-	iflags |= MCI_CMDRDY;
+	iflags |= ATMCI_CMDRDY;
 	cmd = mrq->cmd;
 	cmdflags = atmci_prepare_command(slot->mmc, cmd);
-	atmci_start_command(host, cmd, cmdflags);
+	atmci_send_command(host, cmd, cmdflags);
 
 	if (data)
-		atmci_submit_data(host);
+		host->submit_data(host, data);
 
 	if (mrq->stop) {
 		host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
-		host->stop_cmdr |= MCI_CMDR_STOP_XFER;
+		host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
 		if (!(data->flags & MMC_DATA_WRITE))
-			host->stop_cmdr |= MCI_CMDR_TRDIR_READ;
+			host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
 		if (data->flags & MMC_DATA_STREAM)
-			host->stop_cmdr |= MCI_CMDR_STREAM;
+			host->stop_cmdr |= ATMCI_CMDR_STREAM;
 		else
-			host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK;
+			host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
 	}
 
 	/*
@@ -851,7 +1024,7 @@ static void atmci_start_request(struct atmel_mci *host,
 	 * conditions (e.g. command and data complete, but stop not
 	 * prepared yet.)
 	 */
-	mci_writel(host, IER, iflags);
+	atmci_writel(host, ATMCI_IER, iflags);
 }
 
 static void atmci_queue_request(struct atmel_mci *host,
@@ -909,13 +1082,13 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	struct atmel_mci	*host = slot->host;
 	unsigned int		i;
 
-	slot->sdc_reg &= ~MCI_SDCBUS_MASK;
+	slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
 	switch (ios->bus_width) {
 	case MMC_BUS_WIDTH_1:
-		slot->sdc_reg |= MCI_SDCBUS_1BIT;
+		slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
 		break;
 	case MMC_BUS_WIDTH_4:
-		slot->sdc_reg |= MCI_SDCBUS_4BIT;
+		slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
 		break;
 	}
 
@@ -926,10 +1099,10 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		spin_lock_bh(&host->lock);
 		if (!host->mode_reg) {
 			clk_enable(host->mck);
-			mci_writel(host, CR, MCI_CR_SWRST);
-			mci_writel(host, CR, MCI_CR_MCIEN);
-			if (atmci_is_mci2())
-				mci_writel(host, CFG, host->cfg_reg);
+			atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
+			atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
+			if (host->caps.has_cfg_reg)
+				atmci_writel(host, ATMCI_CFG, host->cfg_reg);
 		}
 
 		/*
@@ -937,7 +1110,7 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		 * core ios update when finding the minimum.
 		 */
 		slot->clock = ios->clock;
-		for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+		for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 			if (host->slot[i] && host->slot[i]->clock
 					&& host->slot[i]->clock < clock_min)
 				clock_min = host->slot[i]->clock;
@@ -952,28 +1125,28 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 			clkdiv = 255;
 		}
 
-		host->mode_reg = MCI_MR_CLKDIV(clkdiv);
+		host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
 
 		/*
 		 * WRPROOF and RDPROOF prevent overruns/underruns by
 		 * stopping the clock when the FIFO is full/empty.
 		 * This state is not expected to last for long.
 		 */
-		if (mci_has_rwproof())
-			host->mode_reg |= (MCI_MR_WRPROOF | MCI_MR_RDPROOF);
+		if (host->caps.has_rwproof)
+			host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
 
-		if (atmci_is_mci2()) {
+		if (host->caps.has_cfg_reg) {
 			/* setup High Speed mode in relation with card capacity */
 			if (ios->timing == MMC_TIMING_SD_HS)
-				host->cfg_reg |= MCI_CFG_HSMODE;
+				host->cfg_reg |= ATMCI_CFG_HSMODE;
 			else
-				host->cfg_reg &= ~MCI_CFG_HSMODE;
+				host->cfg_reg &= ~ATMCI_CFG_HSMODE;
 		}
 
 		if (list_empty(&host->queue)) {
-			mci_writel(host, MR, host->mode_reg);
-			if (atmci_is_mci2())
-				mci_writel(host, CFG, host->cfg_reg);
+			atmci_writel(host, ATMCI_MR, host->mode_reg);
+			if (host->caps.has_cfg_reg)
+				atmci_writel(host, ATMCI_CFG, host->cfg_reg);
 		} else {
 			host->need_clock_update = true;
 		}
@@ -984,16 +1157,16 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
 		spin_lock_bh(&host->lock);
 		slot->clock = 0;
-		for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+		for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 			if (host->slot[i] && host->slot[i]->clock) {
 				any_slot_active = true;
 				break;
 			}
 		}
 		if (!any_slot_active) {
-			mci_writel(host, CR, MCI_CR_MCIDIS);
+			atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
 			if (host->mode_reg) {
-				mci_readl(host, MR);
+				atmci_readl(host, ATMCI_MR);
 				clk_disable(host->mck);
 			}
 			host->mode_reg = 0;
@@ -1057,9 +1230,9 @@ static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
 	struct atmel_mci	*host = slot->host;
 
 	if (enable)
-		mci_writel(host, IER, slot->sdio_irq);
+		atmci_writel(host, ATMCI_IER, slot->sdio_irq);
 	else
-		mci_writel(host, IDR, slot->sdio_irq);
+		atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
 }
 
 static const struct mmc_host_ops atmci_ops = {
@@ -1086,9 +1259,9 @@ static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
 	 * busy transferring data.
 	 */
 	if (host->need_clock_update) {
-		mci_writel(host, MR, host->mode_reg);
-		if (atmci_is_mci2())
-			mci_writel(host, CFG, host->cfg_reg);
+		atmci_writel(host, ATMCI_MR, host->mode_reg);
+		if (host->caps.has_cfg_reg)
+			atmci_writel(host, ATMCI_CFG, host->cfg_reg);
 	}
 
 	host->cur_slot->mrq = NULL;
@@ -1117,16 +1290,16 @@ static void atmci_command_complete(struct atmel_mci *host,
 	u32		status = host->cmd_status;
 
 	/* Read the response from the card (up to 16 bytes) */
-	cmd->resp[0] = mci_readl(host, RSPR);
-	cmd->resp[1] = mci_readl(host, RSPR);
-	cmd->resp[2] = mci_readl(host, RSPR);
-	cmd->resp[3] = mci_readl(host, RSPR);
+	cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
+	cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
+	cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
+	cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
 
-	if (status & MCI_RTOE)
+	if (status & ATMCI_RTOE)
 		cmd->error = -ETIMEDOUT;
-	else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE))
+	else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
 		cmd->error = -EILSEQ;
-	else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE))
+	else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
 		cmd->error = -EIO;
 	else
 		cmd->error = 0;
@@ -1136,10 +1309,10 @@ static void atmci_command_complete(struct atmel_mci *host,
 			"command error: status=0x%08x\n", status);
 
 		if (cmd->data) {
-			atmci_stop_dma(host);
+			host->stop_transfer(host);
 			host->data = NULL;
-			mci_writel(host, IDR, MCI_NOTBUSY
-					| MCI_TXRDY | MCI_RXRDY
+			atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY
+					| ATMCI_TXRDY | ATMCI_RXRDY
 					| ATMCI_DATA_ERROR_FLAGS);
 		}
 	}
@@ -1191,11 +1364,11 @@ static void atmci_detect_change(unsigned long data)
 				 * Reset controller to terminate any ongoing
 				 * commands or data transfers.
 				 */
-				mci_writel(host, CR, MCI_CR_SWRST);
-				mci_writel(host, CR, MCI_CR_MCIEN);
-				mci_writel(host, MR, host->mode_reg);
-				if (atmci_is_mci2())
-					mci_writel(host, CFG, host->cfg_reg);
+				atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
+				atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
+				atmci_writel(host, ATMCI_MR, host->mode_reg);
+				if (host->caps.has_cfg_reg)
+					atmci_writel(host, ATMCI_CFG, host->cfg_reg);
 
 				host->data = NULL;
 				host->cmd = NULL;
@@ -1210,7 +1383,7 @@ static void atmci_detect_change(unsigned long data)
 					/* fall through */
 				case STATE_SENDING_DATA:
 					mrq->data->error = -ENOMEDIUM;
-					atmci_stop_dma(host);
+					host->stop_transfer(host);
 					break;
 				case STATE_DATA_BUSY:
 				case STATE_DATA_ERROR:
@@ -1261,7 +1434,7 @@ static void atmci_tasklet_func(unsigned long priv)
 	dev_vdbg(&host->pdev->dev,
 		"tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
 		state, host->pending_events, host->completed_events,
-		mci_readl(host, IMR));
+		atmci_readl(host, ATMCI_IMR));
 
 	do {
 		prev_state = state;
@@ -1289,9 +1462,9 @@ static void atmci_tasklet_func(unsigned long priv)
 		case STATE_SENDING_DATA:
 			if (atmci_test_and_clear_pending(host,
 						EVENT_DATA_ERROR)) {
-				atmci_stop_dma(host);
+				host->stop_transfer(host);
 				if (data->stop)
-					send_stop_cmd(host, data);
+					atmci_send_stop_cmd(host, data);
 				state = STATE_DATA_ERROR;
 				break;
 			}
@@ -1313,11 +1486,11 @@ static void atmci_tasklet_func(unsigned long priv)
 			atmci_set_completed(host, EVENT_DATA_COMPLETE);
 			status = host->data_status;
 			if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) {
-				if (status & MCI_DTOE) {
+				if (status & ATMCI_DTOE) {
 					dev_dbg(&host->pdev->dev,
 							"data timeout error\n");
 					data->error = -ETIMEDOUT;
-				} else if (status & MCI_DCRCE) {
+				} else if (status & ATMCI_DCRCE) {
 					dev_dbg(&host->pdev->dev,
 							"data CRC error\n");
 					data->error = -EILSEQ;
@@ -1330,7 +1503,7 @@ static void atmci_tasklet_func(unsigned long priv)
 			} else {
 				data->bytes_xfered = data->blocks * data->blksz;
 				data->error = 0;
-				mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS);
+				atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS);
 			}
 
 			if (!data->stop) {
@@ -1340,7 +1513,7 @@ static void atmci_tasklet_func(unsigned long priv)
 
 			prev_state = state = STATE_SENDING_STOP;
 			if (!data->error)
-				send_stop_cmd(host, data);
+				atmci_send_stop_cmd(host, data);
 			/* fall through */
 
 		case STATE_SENDING_STOP:
@@ -1380,7 +1553,7 @@ static void atmci_read_data_pio(struct atmel_mci *host)
 	unsigned int		nbytes = 0;
 
 	do {
-		value = mci_readl(host, RDR);
+		value = atmci_readl(host, ATMCI_RDR);
 		if (likely(offset + 4 <= sg->length)) {
 			put_unaligned(value, (u32 *)(buf + offset));
 
@@ -1412,9 +1585,9 @@ static void atmci_read_data_pio(struct atmel_mci *host)
 			nbytes += offset;
 		}
 
-		status = mci_readl(host, SR);
+		status = atmci_readl(host, ATMCI_SR);
 		if (status & ATMCI_DATA_ERROR_FLAGS) {
-			mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY
+			atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
 						| ATMCI_DATA_ERROR_FLAGS));
 			host->data_status = status;
 			data->bytes_xfered += nbytes;
@@ -1423,7 +1596,7 @@ static void atmci_read_data_pio(struct atmel_mci *host)
 			tasklet_schedule(&host->tasklet);
 			return;
 		}
-	} while (status & MCI_RXRDY);
+	} while (status & ATMCI_RXRDY);
 
 	host->pio_offset = offset;
 	data->bytes_xfered += nbytes;
@@ -1431,8 +1604,8 @@ static void atmci_read_data_pio(struct atmel_mci *host)
 	return;
 
 done:
-	mci_writel(host, IDR, MCI_RXRDY);
-	mci_writel(host, IER, MCI_NOTBUSY);
+	atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
+	atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 	data->bytes_xfered += nbytes;
 	smp_wmb();
 	atmci_set_pending(host, EVENT_XFER_COMPLETE);
@@ -1451,7 +1624,7 @@ static void atmci_write_data_pio(struct atmel_mci *host)
 	do {
 		if (likely(offset + 4 <= sg->length)) {
 			value = get_unaligned((u32 *)(buf + offset));
-			mci_writel(host, TDR, value);
+			atmci_writel(host, ATMCI_TDR, value);
 
 			offset += 4;
 			nbytes += 4;
@@ -1472,20 +1645,20 @@ static void atmci_write_data_pio(struct atmel_mci *host)
 
 			host->sg = sg = sg_next(sg);
 			if (!sg) {
-				mci_writel(host, TDR, value);
+				atmci_writel(host, ATMCI_TDR, value);
 				goto done;
 			}
 
 			offset = 4 - remaining;
 			buf = sg_virt(sg);
 			memcpy((u8 *)&value + remaining, buf, offset);
-			mci_writel(host, TDR, value);
+			atmci_writel(host, ATMCI_TDR, value);
 			nbytes += offset;
 		}
 
-		status = mci_readl(host, SR);
+		status = atmci_readl(host, ATMCI_SR);
 		if (status & ATMCI_DATA_ERROR_FLAGS) {
-			mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY
+			atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
 						| ATMCI_DATA_ERROR_FLAGS));
 			host->data_status = status;
 			data->bytes_xfered += nbytes;
@@ -1494,7 +1667,7 @@ static void atmci_write_data_pio(struct atmel_mci *host)
 			tasklet_schedule(&host->tasklet);
 			return;
 		}
-	} while (status & MCI_TXRDY);
+	} while (status & ATMCI_TXRDY);
 
 	host->pio_offset = offset;
 	data->bytes_xfered += nbytes;
@@ -1502,8 +1675,8 @@ static void atmci_write_data_pio(struct atmel_mci *host)
 	return;
 
 done:
-	mci_writel(host, IDR, MCI_TXRDY);
-	mci_writel(host, IER, MCI_NOTBUSY);
+	atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
+	atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 	data->bytes_xfered += nbytes;
 	smp_wmb();
 	atmci_set_pending(host, EVENT_XFER_COMPLETE);
@@ -1511,7 +1684,7 @@ done:
 
 static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
 {
-	mci_writel(host, IDR, MCI_CMDRDY);
+	atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
 
 	host->cmd_status = status;
 	smp_wmb();
@@ -1523,7 +1696,7 @@ static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
 {
 	int	i;
 
-	for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+	for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 		struct atmel_mci_slot *slot = host->slot[i];
 		if (slot && (status & slot->sdio_irq)) {
 			mmc_signal_sdio_irq(slot->mmc);
@@ -1539,40 +1712,92 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
 	unsigned int		pass_count = 0;
 
 	do {
-		status = mci_readl(host, SR);
-		mask = mci_readl(host, IMR);
+		status = atmci_readl(host, ATMCI_SR);
+		mask = atmci_readl(host, ATMCI_IMR);
 		pending = status & mask;
 		if (!pending)
 			break;
 
 		if (pending & ATMCI_DATA_ERROR_FLAGS) {
-			mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS
-					| MCI_RXRDY | MCI_TXRDY);
-			pending &= mci_readl(host, IMR);
+			atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
+					| ATMCI_RXRDY | ATMCI_TXRDY);
+			pending &= atmci_readl(host, ATMCI_IMR);
 
 			host->data_status = status;
 			smp_wmb();
 			atmci_set_pending(host, EVENT_DATA_ERROR);
 			tasklet_schedule(&host->tasklet);
 		}
-		if (pending & MCI_NOTBUSY) {
-			mci_writel(host, IDR,
-					ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY);
+
+		if (pending & ATMCI_TXBUFE) {
+			atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
+			atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
+			/*
+			 * We can receive this interruption before having configured
+			 * the second pdc buffer, so we need to reconfigure first and
+			 * second buffers again
+			 */
+			if (host->data_size) {
+				atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
+				atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
+				atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
+			} else {
+				atmci_pdc_complete(host);
+			}
+		} else if (pending & ATMCI_ENDTX) {
+			atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
+
+			if (host->data_size) {
+				atmci_pdc_set_single_buf(host,
+						XFER_TRANSMIT, PDC_SECOND_BUF);
+				atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
+			}
+		}
+
+		if (pending & ATMCI_RXBUFF) {
+			atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
+			atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
+			/*
+			 * We can receive this interruption before having configured
+			 * the second pdc buffer, so we need to reconfigure first and
+			 * second buffers again
+			 */
+			if (host->data_size) {
+				atmci_pdc_set_both_buf(host, XFER_RECEIVE);
+				atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
+				atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
+			} else {
+				atmci_pdc_complete(host);
+			}
+		} else if (pending & ATMCI_ENDRX) {
+			atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
+
+			if (host->data_size) {
+				atmci_pdc_set_single_buf(host,
+						XFER_RECEIVE, PDC_SECOND_BUF);
+				atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
+			}
+		}
+
+
+		if (pending & ATMCI_NOTBUSY) {
+			atmci_writel(host, ATMCI_IDR,
+					ATMCI_DATA_ERROR_FLAGS | ATMCI_NOTBUSY);
 			if (!host->data_status)
 				host->data_status = status;
 			smp_wmb();
 			atmci_set_pending(host, EVENT_DATA_COMPLETE);
 			tasklet_schedule(&host->tasklet);
 		}
-		if (pending & MCI_RXRDY)
+		if (pending & ATMCI_RXRDY)
 			atmci_read_data_pio(host);
-		if (pending & MCI_TXRDY)
+		if (pending & ATMCI_TXRDY)
 			atmci_write_data_pio(host);
 
-		if (pending & MCI_CMDRDY)
+		if (pending & ATMCI_CMDRDY)
 			atmci_cmd_interrupt(host, status);
 
-		if (pending & (MCI_SDIOIRQA | MCI_SDIOIRQB))
+		if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
 			atmci_sdio_interrupt(host, status);
 
 	} while (pass_count++ < 5);
@@ -1621,7 +1846,7 @@ static int __init atmci_init_slot(struct atmel_mci *host,
 	mmc->ocr_avail	= MMC_VDD_32_33 | MMC_VDD_33_34;
 	if (sdio_irq)
 		mmc->caps |= MMC_CAP_SDIO_IRQ;
-	if (atmci_is_mci2())
+	if (host->caps.has_highspeed)
 		mmc->caps |= MMC_CAP_SD_HIGHSPEED;
 	if (slot_data->bus_width >= 4)
 		mmc->caps |= MMC_CAP_4_BIT_DATA;
@@ -1704,8 +1929,7 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
 	mmc_free_host(slot->mmc);
 }
 
-#ifdef CONFIG_MMC_ATMELMCI_DMA
-static bool filter(struct dma_chan *chan, void *slave)
+static bool atmci_filter(struct dma_chan *chan, void *slave)
 {
 	struct mci_dma_data	*sl = slave;
 
@@ -1730,14 +1954,14 @@ static void atmci_configure_dma(struct atmel_mci *host)
 		dma_cap_mask_t mask;
 
 		setup_dma_addr(pdata->dma_slave,
-			       host->mapbase + MCI_TDR,
-			       host->mapbase + MCI_RDR);
+			       host->mapbase + ATMCI_TDR,
+			       host->mapbase + ATMCI_RDR);
 
 		/* Try to grab a DMA channel */
 		dma_cap_zero(mask);
 		dma_cap_set(DMA_SLAVE, mask);
 		host->dma.chan =
-			dma_request_channel(mask, filter, pdata->dma_slave);
+			dma_request_channel(mask, atmci_filter, pdata->dma_slave);
 	}
 	if (!host->dma.chan)
 		dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
@@ -1746,9 +1970,60 @@ static void atmci_configure_dma(struct atmel_mci *host)
 					"Using %s for DMA transfers\n",
 					dma_chan_name(host->dma.chan));
 }
+
+static inline unsigned int atmci_get_version(struct atmel_mci *host)
+{
+	return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
+}
+
+/*
+ * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
+ * HSMCI provides DMA support and a new config register but no more supports
+ * PDC.
+ */
+static void __init atmci_get_cap(struct atmel_mci *host)
+{
+	unsigned int version;
+
+	version = atmci_get_version(host);
+	dev_info(&host->pdev->dev,
+			"version: 0x%x\n", version);
+
+	host->caps.has_dma = 0;
+	host->caps.has_pdc = 0;
+	host->caps.has_cfg_reg = 0;
+	host->caps.has_cstor_reg = 0;
+	host->caps.has_highspeed = 0;
+	host->caps.has_rwproof = 0;
+
+	/* keep only major version number */
+	switch (version & 0xf00) {
+	case 0x100:
+	case 0x200:
+		host->caps.has_pdc = 1;
+		host->caps.has_rwproof = 1;
+		break;
+	case 0x300:
+	case 0x400:
+	case 0x500:
+#ifdef CONFIG_AT_HDMAC
+		host->caps.has_dma = 1;
 #else
-static void atmci_configure_dma(struct atmel_mci *host) {}
+		host->caps.has_dma = 0;
+		dev_info(&host->pdev->dev,
+			"has dma capability but dma engine is not selected, then use pio\n");
 #endif
+		host->caps.has_cfg_reg = 1;
+		host->caps.has_cstor_reg = 1;
+		host->caps.has_highspeed = 1;
+		host->caps.has_rwproof = 1;
+		break;
+	default:
+		dev_warn(&host->pdev->dev,
+				"Unmanaged mci version, set minimum capabilities\n");
+		break;
+	}
+}
 
 static int __init atmci_probe(struct platform_device *pdev)
 {
@@ -1789,7 +2064,7 @@ static int __init atmci_probe(struct platform_device *pdev)
 		goto err_ioremap;
 
 	clk_enable(host->mck);
-	mci_writel(host, CR, MCI_CR_SWRST);
+	atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
 	host->bus_hz = clk_get_rate(host->mck);
 	clk_disable(host->mck);
 
@@ -1801,7 +2076,27 @@ static int __init atmci_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_request_irq;
 
-	atmci_configure_dma(host);
+	/* Get MCI capabilities and set operations according to it */
+	atmci_get_cap(host);
+	if (host->caps.has_dma) {
+		dev_info(&pdev->dev, "using DMA\n");
+		host->prepare_data = &atmci_prepare_data_dma;
+		host->submit_data = &atmci_submit_data_dma;
+		host->stop_transfer = &atmci_stop_transfer_dma;
+	} else if (host->caps.has_pdc) {
+		dev_info(&pdev->dev, "using PDC\n");
+		host->prepare_data = &atmci_prepare_data_pdc;
+		host->submit_data = &atmci_submit_data_pdc;
+		host->stop_transfer = &atmci_stop_transfer_pdc;
+	} else {
+		dev_info(&pdev->dev, "no DMA, no PDC\n");
+		host->prepare_data = &atmci_prepare_data;
+		host->submit_data = &atmci_submit_data;
+		host->stop_transfer = &atmci_stop_transfer;
+	}
+
+	if (host->caps.has_dma)
+		atmci_configure_dma(host);
 
 	platform_set_drvdata(pdev, host);
 
@@ -1810,13 +2105,13 @@ static int __init atmci_probe(struct platform_device *pdev)
 	ret = -ENODEV;
 	if (pdata->slot[0].bus_width) {
 		ret = atmci_init_slot(host, &pdata->slot[0],
-				0, MCI_SDCSEL_SLOT_A, MCI_SDIOIRQA);
+				0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
 		if (!ret)
 			nr_slots++;
 	}
 	if (pdata->slot[1].bus_width) {
 		ret = atmci_init_slot(host, &pdata->slot[1],
-				1, MCI_SDCSEL_SLOT_B, MCI_SDIOIRQB);
+				1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
 		if (!ret)
 			nr_slots++;
 	}
@@ -1833,10 +2128,8 @@ static int __init atmci_probe(struct platform_device *pdev)
 	return 0;
 
 err_init_slot:
-#ifdef CONFIG_MMC_ATMELMCI_DMA
 	if (host->dma.chan)
 		dma_release_channel(host->dma.chan);
-#endif
 	free_irq(irq, host);
 err_request_irq:
 	iounmap(host->regs);
@@ -1854,15 +2147,15 @@ static int __exit atmci_remove(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, NULL);
 
-	for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+	for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 		if (host->slot[i])
 			atmci_cleanup_slot(host->slot[i], i);
 	}
 
 	clk_enable(host->mck);
-	mci_writel(host, IDR, ~0UL);
-	mci_writel(host, CR, MCI_CR_MCIDIS);
-	mci_readl(host, SR);
+	atmci_writel(host, ATMCI_IDR, ~0UL);
+	atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
+	atmci_readl(host, ATMCI_SR);
 	clk_disable(host->mck);
 
 #ifdef CONFIG_MMC_ATMELMCI_DMA
@@ -1885,7 +2178,7 @@ static int atmci_suspend(struct device *dev)
 	struct atmel_mci *host = dev_get_drvdata(dev);
 	int i;
 
-	 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+	 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 		struct atmel_mci_slot *slot = host->slot[i];
 		int ret;
 
@@ -1916,7 +2209,7 @@ static int atmci_resume(struct device *dev)
 	int i;
 	int ret = 0;
 
-	for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+	for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 		struct atmel_mci_slot *slot = host->slot[i];
 		int err;