1 files changed, 288 insertions, 186 deletions

diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 04ae884383f6..24e09454e522 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -3,6 +3,7 @@
  *
  *  Copyright (C) 2007 Google Inc,
  *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *  Copyright (C) 2009, Code Aurora Forum. All Rights Reserved.
  *
  * 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
@@ -26,6 +27,7 @@
 #include <linux/log2.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
 #include <linux/clk.h>
 #include <linux/scatterlist.h>
 #include <linux/platform_device.h>
@@ -47,6 +49,8 @@
 
 #define DRIVER_NAME "msm-sdcc"
 
+#define BUSCLK_PWRSAVE 1
+#define BUSCLK_TIMEOUT (HZ)
 static unsigned int msmsdcc_fmin = 144000;
 static unsigned int msmsdcc_fmax = 50000000;
 static unsigned int msmsdcc_4bit = 1;
@@ -57,6 +61,67 @@ static unsigned int msmsdcc_sdioirq;
 #define PIO_SPINMAX 30
 #define CMD_SPINMAX 20
 
+
+static inline void
+msmsdcc_disable_clocks(struct msmsdcc_host *host, int deferr)
+{
+	WARN_ON(!host->clks_on);
+
+	BUG_ON(host->curr.mrq);
+
+	if (deferr) {
+		mod_timer(&host->busclk_timer, jiffies + BUSCLK_TIMEOUT);
+	} else {
+		del_timer_sync(&host->busclk_timer);
+		/* Need to check clks_on again in case the busclk
+		 * timer fired
+		 */
+		if (host->clks_on) {
+			clk_disable(host->clk);
+			clk_disable(host->pclk);
+			host->clks_on = 0;
+		}
+	}
+}
+
+static inline int
+msmsdcc_enable_clocks(struct msmsdcc_host *host)
+{
+	int rc;
+
+	del_timer_sync(&host->busclk_timer);
+
+	if (!host->clks_on) {
+		rc = clk_enable(host->pclk);
+		if (rc)
+			return rc;
+		rc = clk_enable(host->clk);
+		if (rc) {
+			clk_disable(host->pclk);
+			return rc;
+		}
+		udelay(1 + ((3 * USEC_PER_SEC) /
+		       (host->clk_rate ? host->clk_rate : msmsdcc_fmin)));
+		host->clks_on = 1;
+	}
+	return 0;
+}
+
+static inline unsigned int
+msmsdcc_readl(struct msmsdcc_host *host, unsigned int reg)
+{
+	return readl(host->base + reg);
+}
+
+static inline void
+msmsdcc_writel(struct msmsdcc_host *host, u32 data, unsigned int reg)
+{
+	writel(data, host->base + reg);
+	/* 3 clk delay required! */
+	udelay(1 + ((3 * USEC_PER_SEC) /
+	       (host->clk_rate ? host->clk_rate : msmsdcc_fmin)));
+}
+
 static void
 msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd,
 		      u32 c);
@@ -64,8 +129,6 @@ msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd,
 static void
 msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
 {
-	writel(0, host->base + MMCICOMMAND);
-
 	BUG_ON(host->curr.data);
 
 	host->curr.mrq = NULL;
@@ -76,6 +139,9 @@ msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
 	if (mrq->cmd->error == -ETIMEDOUT)
 		mdelay(5);
 
+#if BUSCLK_PWRSAVE
+	msmsdcc_disable_clocks(host, 1);
+#endif
 	/*
 	 * Need to drop the host lock here; mmc_request_done may call
 	 * back into the driver...
@@ -88,7 +154,6 @@ msmsdcc_request_end(struct msmsdcc_host *host, struct mmc_request *mrq)
 static void
 msmsdcc_stop_data(struct msmsdcc_host *host)
 {
-	writel(0, host->base + MMCIDATACTRL);
 	host->curr.data = NULL;
 	host->curr.got_dataend = host->curr.got_datablkend = 0;
 }
@@ -109,6 +174,31 @@ uint32_t msmsdcc_fifo_addr(struct msmsdcc_host *host)
 	return 0;
 }
 
+static inline void
+msmsdcc_start_command_exec(struct msmsdcc_host *host, u32 arg, u32 c) {
+       msmsdcc_writel(host, arg, MMCIARGUMENT);
+       msmsdcc_writel(host, c, MMCICOMMAND);
+}
+
+static void
+msmsdcc_dma_exec_func(struct msm_dmov_cmd *cmd)
+{
+	struct msmsdcc_host *host = (struct msmsdcc_host *)cmd->data;
+
+	msmsdcc_writel(host, host->cmd_timeout, MMCIDATATIMER);
+	msmsdcc_writel(host, (unsigned int)host->curr.xfer_size,
+		       MMCIDATALENGTH);
+	msmsdcc_writel(host, host->cmd_pio_irqmask, MMCIMASK1);
+	msmsdcc_writel(host, host->cmd_datactrl, MMCIDATACTRL);
+
+	if (host->cmd_cmd) {
+		msmsdcc_start_command_exec(host,
+					   (u32) host->cmd_cmd->arg,
+					   (u32) host->cmd_c);
+	}
+	host->dma.active = 1;
+}
+
 static void
 msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
 			  unsigned int result,
@@ -121,8 +211,11 @@ msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
 	struct mmc_request	*mrq;
 
 	spin_lock_irqsave(&host->lock, flags);
+	host->dma.active = 0;
+
 	mrq = host->curr.mrq;
 	BUG_ON(!mrq);
+	WARN_ON(!mrq->data);
 
 	if (!(result & DMOV_RSLT_VALID)) {
 		pr_err("msmsdcc: Invalid DataMover result\n");
@@ -146,7 +239,6 @@ msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
 		if (!mrq->data->error)
 			mrq->data->error = -EIO;
 	}
-	host->dma.busy = 0;
 	dma_unmap_sg(mmc_dev(host->mmc), host->dma.sg, host->dma.num_ents,
 		     host->dma.dir);
 
@@ -159,6 +251,7 @@ msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
 	}
 
 	host->dma.sg = NULL;
+	host->dma.busy = 0;
 
 	if ((host->curr.got_dataend && host->curr.got_datablkend)
 	     || mrq->data->error) {
@@ -172,12 +265,14 @@ msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
 		if (!mrq->data->error)
 			host->curr.data_xfered = host->curr.xfer_size;
 		if (!mrq->data->stop || mrq->cmd->error) {
-			writel(0, host->base + MMCICOMMAND);
 			host->curr.mrq = NULL;
 			host->curr.cmd = NULL;
 			mrq->data->bytes_xfered = host->curr.data_xfered;
 
 			spin_unlock_irqrestore(&host->lock, flags);
+#if BUSCLK_PWRSAVE
+			msmsdcc_disable_clocks(host, 1);
+#endif
 			mmc_request_done(host->mmc, mrq);
 			return;
 		} else
@@ -218,6 +313,8 @@ static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
 	host->dma.sg = data->sg;
 	host->dma.num_ents = data->sg_len;
 
+       BUG_ON(host->dma.num_ents > NR_SG); /* Prevent memory corruption */
+
 	nc = host->dma.nc;
 
 	switch (host->pdev_id) {
@@ -246,22 +343,15 @@ static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
 
 	host->curr.user_pages = 0;
 
-	n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
-		       host->dma.num_ents, host->dma.dir);
-
-	if (n != host->dma.num_ents) {
-		pr_err("%s: Unable to map in all sg elements\n",
-		       mmc_hostname(host->mmc));
-		host->dma.sg = NULL;
-		host->dma.num_ents = 0;
-		return -ENOMEM;
-	}
-
 	box = &nc->cmd[0];
 	for (i = 0; i < host->dma.num_ents; i++) {
 		box->cmd = CMD_MODE_BOX;
 
-		if (i == (host->dma.num_ents - 1))
+	/* Initialize sg dma address */
+	sg->dma_address = page_to_dma(mmc_dev(host->mmc), sg_page(sg))
+				+ sg->offset;
+
+	if (i == (host->dma.num_ents - 1))
 			box->cmd |= CMD_LC;
 		rows = (sg_dma_len(sg) % MCI_FIFOSIZE) ?
 			(sg_dma_len(sg) / MCI_FIFOSIZE) + 1 :
@@ -300,15 +390,70 @@ static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
 			       DMOV_CMD_ADDR(host->dma.cmdptr_busaddr);
 	host->dma.hdr.complete_func = msmsdcc_dma_complete_func;
 
+	n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
+			host->dma.num_ents, host->dma.dir);
+/* dsb inside dma_map_sg will write nc out to mem as well */
+
+	if (n != host->dma.num_ents) {
+		printk(KERN_ERR "%s: Unable to map in all sg elements\n",
+			mmc_hostname(host->mmc));
+		host->dma.sg = NULL;
+		host->dma.num_ents = 0;
+		return -ENOMEM;
+	}
+
 	return 0;
 }
 
+static int
+snoop_cccr_abort(struct mmc_command *cmd)
+{
+	if ((cmd->opcode == 52) &&
+	    (cmd->arg & 0x80000000) &&
+	    (((cmd->arg >> 9) & 0x1ffff) == SDIO_CCCR_ABORT))
+		return 1;
+	return 0;
+}
+
+static void
+msmsdcc_start_command_deferred(struct msmsdcc_host *host,
+				struct mmc_command *cmd, u32 *c)
+{
+	*c |= (cmd->opcode | MCI_CPSM_ENABLE);
+
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136)
+			*c |= MCI_CPSM_LONGRSP;
+		*c |= MCI_CPSM_RESPONSE;
+	}
+
+	if (/*interrupt*/0)
+		*c |= MCI_CPSM_INTERRUPT;
+
+	if ((((cmd->opcode == 17) || (cmd->opcode == 18))  ||
+	     ((cmd->opcode == 24) || (cmd->opcode == 25))) ||
+	      (cmd->opcode == 53))
+		*c |= MCI_CSPM_DATCMD;
+
+	if (cmd == cmd->mrq->stop)
+		*c |= MCI_CSPM_MCIABORT;
+
+	if (snoop_cccr_abort(cmd))
+		*c |= MCI_CSPM_MCIABORT;
+
+	if (host->curr.cmd != NULL) {
+		printk(KERN_ERR "%s: Overlapping command requests\n",
+			mmc_hostname(host->mmc));
+	}
+	host->curr.cmd = cmd;
+}
+
 static void
-msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data)
+msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data,
+			struct mmc_command *cmd, u32 c)
 {
 	unsigned int datactrl, timeout;
 	unsigned long long clks;
-	void __iomem *base = host->base;
 	unsigned int pio_irqmask = 0;
 
 	host->curr.data = data;
@@ -320,13 +465,6 @@ msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data)
 
 	memset(&host->pio, 0, sizeof(host->pio));
 
-	clks = (unsigned long long)data->timeout_ns * host->clk_rate;
-	do_div(clks, NSEC_PER_SEC);
-	timeout = data->timeout_clks + (unsigned int)clks;
-	writel(timeout, base + MMCIDATATIMER);
-
-	writel(host->curr.xfer_size, base + MMCIDATALENGTH);
-
 	datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
 
 	if (!msmsdcc_config_dma(host, data))
@@ -347,47 +485,51 @@ msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data)
 	if (data->flags & MMC_DATA_READ)
 		datactrl |= MCI_DPSM_DIRECTION;
 
-	writel(pio_irqmask, base + MMCIMASK1);
-	writel(datactrl, base + MMCIDATACTRL);
+	clks = (unsigned long long)data->timeout_ns * host->clk_rate;
+	do_div(clks, NSEC_PER_SEC);
+	timeout = data->timeout_clks + (unsigned int)clks*2 ;
 
 	if (datactrl & MCI_DPSM_DMAENABLE) {
+		/* Save parameters for the exec function */
+		host->cmd_timeout = timeout;
+		host->cmd_pio_irqmask = pio_irqmask;
+		host->cmd_datactrl = datactrl;
+		host->cmd_cmd = cmd;
+
+		host->dma.hdr.execute_func = msmsdcc_dma_exec_func;
+		host->dma.hdr.data = (void *)host;
 		host->dma.busy = 1;
+
+		if (cmd) {
+			msmsdcc_start_command_deferred(host, cmd, &c);
+			host->cmd_c = c;
+		}
 		msm_dmov_enqueue_cmd(host->dma.channel, &host->dma.hdr);
+	} else {
+		msmsdcc_writel(host, timeout, MMCIDATATIMER);
+
+		msmsdcc_writel(host, host->curr.xfer_size, MMCIDATALENGTH);
+
+		msmsdcc_writel(host, pio_irqmask, MMCIMASK1);
+		msmsdcc_writel(host, datactrl, MMCIDATACTRL);
+
+		if (cmd) {
+			/* Daisy-chain the command if requested */
+			msmsdcc_start_command(host, cmd, c);
+		}
 	}
 }
 
 static void
 msmsdcc_start_command(struct msmsdcc_host *host, struct mmc_command *cmd, u32 c)
 {
-	void __iomem *base = host->base;
-
-	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
-		writel(0, base + MMCICOMMAND);
-		udelay(2 + ((5 * 1000000) / host->clk_rate));
-	}
-
-	c |= cmd->opcode | MCI_CPSM_ENABLE;
-
-	if (cmd->flags & MMC_RSP_PRESENT) {
-		if (cmd->flags & MMC_RSP_136)
-			c |= MCI_CPSM_LONGRSP;
-		c |= MCI_CPSM_RESPONSE;
-	}
-
-	if (cmd->opcode == 17 || cmd->opcode == 18 ||
-	    cmd->opcode == 24 || cmd->opcode == 25 ||
-	    cmd->opcode == 53)
-		c |= MCI_CSPM_DATCMD;
-
 	if (cmd == cmd->mrq->stop)
 		c |= MCI_CSPM_MCIABORT;
 
-	host->curr.cmd = cmd;
-
 	host->stats.cmds++;
 
-	writel(cmd->arg, base + MMCIARGUMENT);
-	writel(c, base + MMCICOMMAND);
+	msmsdcc_start_command_deferred(host, cmd, &c);
+	msmsdcc_start_command_exec(host, cmd->arg, c);
 }
 
 static void
@@ -421,13 +563,11 @@ msmsdcc_data_err(struct msmsdcc_host *host, struct mmc_data *data,
 static int
 msmsdcc_pio_read(struct msmsdcc_host *host, char *buffer, unsigned int remain)
 {
-	void __iomem	*base = host->base;
 	uint32_t	*ptr = (uint32_t *) buffer;
 	int		count = 0;
 
-	while (readl(base + MMCISTATUS) & MCI_RXDATAAVLBL) {
-
-		*ptr = readl(base + MMCIFIFO + (count % MCI_FIFOSIZE));
+	while (msmsdcc_readl(host, MMCISTATUS) & MCI_RXDATAAVLBL) {
+		*ptr = msmsdcc_readl(host, MMCIFIFO + (count % MCI_FIFOSIZE));
 		ptr++;
 		count += sizeof(uint32_t);
 
@@ -459,7 +599,7 @@ msmsdcc_pio_write(struct msmsdcc_host *host, char *buffer,
 		if (remain == 0)
 			break;
 
-		status = readl(base + MMCISTATUS);
+		status = msmsdcc_readl(host, MMCISTATUS);
 	} while (status & MCI_TXFIFOHALFEMPTY);
 
 	return ptr - buffer;
@@ -469,7 +609,7 @@ static int
 msmsdcc_spin_on_status(struct msmsdcc_host *host, uint32_t mask, int maxspin)
 {
 	while (maxspin) {
-		if ((readl(host->base + MMCISTATUS) & mask))
+		if ((msmsdcc_readl(host, MMCISTATUS) & mask))
 			return 0;
 		udelay(1);
 		--maxspin;
@@ -477,14 +617,13 @@ msmsdcc_spin_on_status(struct msmsdcc_host *host, uint32_t mask, int maxspin)
 	return -ETIMEDOUT;
 }
 
-static int
+static irqreturn_t
 msmsdcc_pio_irq(int irq, void *dev_id)
 {
 	struct msmsdcc_host	*host = dev_id;
-	void __iomem		*base = host->base;
 	uint32_t		status;
 
-	status = readl(base + MMCISTATUS);
+	status = msmsdcc_readl(host, MMCISTATUS);
 
 	do {
 		unsigned long flags;
@@ -539,14 +678,14 @@ msmsdcc_pio_irq(int irq, void *dev_id)
 			host->pio.sg_off = 0;
 		}
 
-		status = readl(base + MMCISTATUS);
+		status = msmsdcc_readl(host, MMCISTATUS);
 	} while (1);
 
 	if (status & MCI_RXACTIVE && host->curr.xfer_remain < MCI_FIFOSIZE)
-		writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
+		msmsdcc_writel(host, MCI_RXDATAAVLBLMASK, MMCIMASK1);
 
 	if (!host->curr.xfer_remain)
-		writel(0, base + MMCIMASK1);
+		msmsdcc_writel(host, 0, MMCIMASK1);
 
 	return IRQ_HANDLED;
 }
@@ -554,15 +693,13 @@ msmsdcc_pio_irq(int irq, void *dev_id)
 static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
 {
 	struct mmc_command *cmd = host->curr.cmd;
-	void __iomem	   *base = host->base;
 
 	host->curr.cmd = NULL;
-	cmd->resp[0] = readl(base + MMCIRESPONSE0);
-	cmd->resp[1] = readl(base + MMCIRESPONSE1);
-	cmd->resp[2] = readl(base + MMCIRESPONSE2);
-	cmd->resp[3] = readl(base + MMCIRESPONSE3);
+	cmd->resp[0] = msmsdcc_readl(host, MMCIRESPONSE0);
+	cmd->resp[1] = msmsdcc_readl(host, MMCIRESPONSE1);
+	cmd->resp[2] = msmsdcc_readl(host, MMCIRESPONSE2);
+	cmd->resp[3] = msmsdcc_readl(host, MMCIRESPONSE3);
 
-	del_timer(&host->command_timer);
 	if (status & MCI_CMDTIMEOUT) {
 		cmd->error = -ETIMEDOUT;
 	} else if (status & MCI_CMDCRCFAIL &&
@@ -580,8 +717,10 @@ static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
 			msmsdcc_request_end(host, cmd->mrq);
 		} else /* host->data == NULL */
 			msmsdcc_request_end(host, cmd->mrq);
-	} else if (!(cmd->data->flags & MMC_DATA_READ))
-		msmsdcc_start_data(host, cmd->data);
+	} else if (cmd->data)
+		if (!(cmd->data->flags & MMC_DATA_READ))
+			msmsdcc_start_data(host, cmd->data,
+						NULL, 0);
 }
 
 static void
@@ -590,6 +729,11 @@ msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
 {
 	struct mmc_data *data = host->curr.data;
 
+	if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
+	              MCI_CMDTIMEOUT) && host->curr.cmd) {
+		msmsdcc_do_cmdirq(host, status);
+	}
+
 	if (!data)
 		return;
 
@@ -602,7 +746,8 @@ msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
 			msm_dmov_stop_cmd(host->dma.channel,
 					  &host->dma.hdr, 0);
 		else {
-			msmsdcc_stop_data(host);
+			if (host->curr.data)
+				msmsdcc_stop_data(host);
 			if (!data->stop)
 				msmsdcc_request_end(host, data->mrq);
 			else
@@ -657,17 +802,18 @@ msmsdcc_irq(int irq, void *dev_id)
 	spin_lock(&host->lock);
 
 	do {
-		status = readl(base + MMCISTATUS);
+		status = msmsdcc_readl(host, MMCISTATUS);
+		status &= (msmsdcc_readl(host, MMCIMASK0) |
+					      MCI_DATABLOCKENDMASK);
+		msmsdcc_writel(host, status, MMCICLEAR);
 
-		status &= (readl(base + MMCIMASK0) | MCI_DATABLOCKENDMASK);
-		writel(status, base + MMCICLEAR);
+		if (status & MCI_SDIOINTR)
+			status &= ~MCI_SDIOINTR;
 
-		msmsdcc_handle_irq_data(host, status, base);
+		if (!status)
+			break;
 
-		if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
-			      MCI_CMDTIMEOUT) && host->curr.cmd) {
-			msmsdcc_do_cmdirq(host, status);
-		}
+		msmsdcc_handle_irq_data(host, status, base);
 
 		if (status & MCI_SDIOINTOPER) {
 			cardint = 1;
@@ -714,24 +860,27 @@ msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		return;
 	}
 
+	msmsdcc_enable_clocks(host);
+
 	host->curr.mrq = mrq;
 
 	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
-		msmsdcc_start_data(host, mrq->data);
-
-	msmsdcc_start_command(host, mrq->cmd, 0);
+		/* Queue/read data, daisy-chain command when data starts */
+		msmsdcc_start_data(host, mrq->data, mrq->cmd, 0);
+	else
+		msmsdcc_start_command(host, mrq->cmd, 0);
 
 	if (host->cmdpoll && !msmsdcc_spin_on_status(host,
 				MCI_CMDRESPEND|MCI_CMDCRCFAIL|MCI_CMDTIMEOUT,
 				CMD_SPINMAX)) {
-		uint32_t status = readl(host->base + MMCISTATUS);
+		uint32_t status = msmsdcc_readl(host, MMCISTATUS);
 		msmsdcc_do_cmdirq(host, status);
-		writel(MCI_CMDRESPEND | MCI_CMDCRCFAIL | MCI_CMDTIMEOUT,
-		       host->base + MMCICLEAR);
+		msmsdcc_writel(host,
+			       MCI_CMDRESPEND | MCI_CMDCRCFAIL | MCI_CMDTIMEOUT,
+			       MMCICLEAR);
 		host->stats.cmdpoll_hits++;
 	} else {
 		host->stats.cmdpoll_misses++;
-		mod_timer(&host->command_timer, jiffies + HZ);
 	}
 	spin_unlock_irqrestore(&host->lock, flags);
 }
@@ -742,14 +891,13 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	struct msmsdcc_host *host = mmc_priv(mmc);
 	u32 clk = 0, pwr = 0;
 	int rc;
+	unsigned long flags;
 
-	if (ios->clock) {
+	spin_lock_irqsave(&host->lock, flags);
 
-		if (!host->clks_on) {
-			clk_enable(host->pclk);
-			clk_enable(host->clk);
-			host->clks_on = 1;
-		}
+	msmsdcc_enable_clocks(host);
+
+	if (ios->clock) {
 		if (ios->clock != host->clk_rate) {
 			rc = clk_set_rate(host->clk, ios->clock);
 			if (rc < 0)
@@ -787,18 +935,16 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 		pwr |= MCI_OD;
 
-	writel(clk, host->base + MMCICLOCK);
+	msmsdcc_writel(host, clk, MMCICLOCK);
 
 	if (host->pwr != pwr) {
 		host->pwr = pwr;
-		writel(pwr, host->base + MMCIPOWER);
-	}
-
-	if (!(clk & MCI_CLK_ENABLE) && host->clks_on) {
-		clk_disable(host->clk);
-		clk_disable(host->pclk);
-		host->clks_on = 0;
+		msmsdcc_writel(host, pwr, MMCIPOWER);
 	}
+#if BUSCLK_PWRSAVE
+	msmsdcc_disable_clocks(host, 1);
+#endif
+	spin_unlock_irqrestore(&host->lock, flags);
 }
 
 static void msmsdcc_enable_sdio_irq(struct mmc_host *mmc, int enable)
@@ -809,13 +955,13 @@ static void msmsdcc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 
 	spin_lock_irqsave(&host->lock, flags);
 	if (msmsdcc_sdioirq == 1) {
-		status = readl(host->base + MMCIMASK0);
+		status = msmsdcc_readl(host, MMCIMASK0);
 		if (enable)
 			status |= MCI_SDIOINTOPERMASK;
 		else
 			status &= ~MCI_SDIOINTOPERMASK;
 		host->saved_irq0mask = status;
-		writel(status, host->base + MMCIMASK0);
+		msmsdcc_writel(host, status, MMCIMASK0);
 	}
 	spin_unlock_irqrestore(&host->lock, flags);
 }
@@ -875,42 +1021,13 @@ msmsdcc_status_notify_cb(int card_present, void *dev_id)
 	msmsdcc_check_status((unsigned long) host);
 }
 
-/*
- * called when a command expires.
- * Dump some debugging, and then error
- * out the transaction.
- */
 static void
-msmsdcc_command_expired(unsigned long _data)
+msmsdcc_busclk_expired(unsigned long _data)
 {
 	struct msmsdcc_host	*host = (struct msmsdcc_host *) _data;
-	struct mmc_request	*mrq;
-	unsigned long		flags;
-
-	spin_lock_irqsave(&host->lock, flags);
-	mrq = host->curr.mrq;
-
-	if (!mrq) {
-		pr_info("%s: Command expiry misfire\n",
-			mmc_hostname(host->mmc));
-		spin_unlock_irqrestore(&host->lock, flags);
-		return;
-	}
-
-	pr_err("%s: Command timeout (%p %p %p %p)\n",
-	       mmc_hostname(host->mmc), mrq, mrq->cmd,
-	       mrq->data, host->dma.sg);
 
-	mrq->cmd->error = -ETIMEDOUT;
-	msmsdcc_stop_data(host);
-
-	writel(0, host->base + MMCICOMMAND);
-
-	host->curr.mrq = NULL;
-	host->curr.cmd = NULL;
-
-	spin_unlock_irqrestore(&host->lock, flags);
-	mmc_request_done(host->mmc, mrq);
+	if (host->clks_on)
+		msmsdcc_disable_clocks(host, 0);
 }
 
 static int
@@ -1012,6 +1129,7 @@ msmsdcc_probe(struct platform_device *pdev)
 	host->pdev_id = pdev->id;
 	host->plat = plat;
 	host->mmc = mmc;
+	host->curr.cmd = NULL;
 
 	host->cmdpoll = 1;
 
@@ -1027,36 +1145,35 @@ msmsdcc_probe(struct platform_device *pdev)
 	host->dmares = dmares;
 	spin_lock_init(&host->lock);
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+	if (plat->embedded_sdio)
+		mmc_set_embedded_sdio_data(mmc,
+					   &plat->embedded_sdio->cis,
+					   &plat->embedded_sdio->cccr,
+					   plat->embedded_sdio->funcs,
+					   plat->embedded_sdio->num_funcs);
+#endif
+
 	/*
 	 * Setup DMA
 	 */
 	msmsdcc_init_dma(host);
 
-	/*
-	 * Setup main peripheral bus clock
-	 */
+	/* Get our clocks */
 	host->pclk = clk_get(&pdev->dev, "sdc_pclk");
 	if (IS_ERR(host->pclk)) {
 		ret = PTR_ERR(host->pclk);
 		goto host_free;
 	}
 
-	ret = clk_enable(host->pclk);
-	if (ret)
-		goto pclk_put;
-
-	host->pclk_rate = clk_get_rate(host->pclk);
-
-	/*
-	 * Setup SDC MMC clock
-	 */
 	host->clk = clk_get(&pdev->dev, "sdc_clk");
 	if (IS_ERR(host->clk)) {
 		ret = PTR_ERR(host->clk);
-		goto pclk_disable;
+		goto pclk_put;
 	}
 
-	ret = clk_enable(host->clk);
+	/* Enable clocks */
+	ret = msmsdcc_enable_clocks(host);
 	if (ret)
 		goto clk_put;
 
@@ -1066,10 +1183,9 @@ msmsdcc_probe(struct platform_device *pdev)
 		goto clk_disable;
 	}
 
+	host->pclk_rate = clk_get_rate(host->pclk);
 	host->clk_rate = clk_get_rate(host->clk);
 
-	host->clks_on = 1;
-
 	/*
 	 * Setup MMC host structure
 	 */
@@ -1092,10 +1208,10 @@ msmsdcc_probe(struct platform_device *pdev)
 	mmc->max_req_size = 33554432;	/* MCI_DATA_LENGTH is 25 bits */
 	mmc->max_seg_size = mmc->max_req_size;
 
-	writel(0, host->base + MMCIMASK0);
-	writel(0x5e007ff, host->base + MMCICLEAR); /* Add: 1 << 25 */
+	msmsdcc_writel(host, 0, MMCIMASK0);
+	msmsdcc_writel(host, 0x5e007ff, MMCICLEAR);
 
-	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+	msmsdcc_writel(host, MCI_IRQENABLE, MMCIMASK0);
 	host->saved_irq0mask = MCI_IRQENABLE;
 
 	/*
@@ -1137,13 +1253,9 @@ msmsdcc_probe(struct platform_device *pdev)
 		host->eject = !host->oldstat;
 	}
 
-	/*
-	 * Setup a command timer. We currently need this due to
-	 * some 'strange' timeout / error handling situations.
-	 */
-	init_timer(&host->command_timer);
-	host->command_timer.data = (unsigned long) host;
-	host->command_timer.function = msmsdcc_command_expired;
+	init_timer(&host->busclk_timer);
+	host->busclk_timer.data = (unsigned long) host;
+	host->busclk_timer.function = msmsdcc_busclk_expired;
 
 	ret = request_irq(cmd_irqres->start, msmsdcc_irq, IRQF_SHARED,
 			  DRIVER_NAME " (cmd)", host);
@@ -1181,6 +1293,9 @@ msmsdcc_probe(struct platform_device *pdev)
 	if (host->timer.function)
 		pr_info("%s: Polling status mode enabled\n", mmc_hostname(mmc));
 
+#if BUSCLK_PWRSAVE
+	msmsdcc_disable_clocks(host, 1);
+#endif
 	return 0;
  cmd_irq_free:
 	free_irq(cmd_irqres->start, host);
@@ -1188,11 +1303,9 @@ msmsdcc_probe(struct platform_device *pdev)
 	if (host->stat_irq)
 		free_irq(host->stat_irq, host);
  clk_disable:
-	clk_disable(host->clk);
+	msmsdcc_disable_clocks(host, 0);
  clk_put:
 	clk_put(host->clk);
- pclk_disable:
-	clk_disable(host->pclk);
  pclk_put:
 	clk_put(host->pclk);
  host_free:
@@ -1214,16 +1327,11 @@ msmsdcc_suspend(struct platform_device *dev, pm_message_t state)
 			disable_irq(host->stat_irq);
 
 		if (mmc->card && mmc->card->type != MMC_TYPE_SDIO)
-			rc = mmc_suspend_host(mmc, state);
-		if (!rc) {
-			writel(0, host->base + MMCIMASK0);
-
-			if (host->clks_on) {
-				clk_disable(host->clk);
-				clk_disable(host->pclk);
-				host->clks_on = 0;
-			}
-		}
+			rc = mmc_suspend_host(mmc);
+		if (!rc)
+			msmsdcc_writel(host, 0, MMCIMASK0);
+		if (host->clks_on)
+			msmsdcc_disable_clocks(host, 0);
 	}
 	return rc;
 }
@@ -1232,27 +1340,21 @@ static int
 msmsdcc_resume(struct platform_device *dev)
 {
 	struct mmc_host *mmc = mmc_get_drvdata(dev);
-	unsigned long flags;
 
 	if (mmc) {
 		struct msmsdcc_host *host = mmc_priv(mmc);
 
-		spin_lock_irqsave(&host->lock, flags);
+		msmsdcc_enable_clocks(host);
 
-		if (!host->clks_on) {
-			clk_enable(host->pclk);
-			clk_enable(host->clk);
-			host->clks_on = 1;
-		}
-
-		writel(host->saved_irq0mask, host->base + MMCIMASK0);
-
-		spin_unlock_irqrestore(&host->lock, flags);
+		msmsdcc_writel(host, host->saved_irq0mask, MMCIMASK0);
 
 		if (mmc->card && mmc->card->type != MMC_TYPE_SDIO)
 			mmc_resume_host(mmc);
 		if (host->stat_irq)
 			enable_irq(host->stat_irq);
+#if BUSCLK_PWRSAVE
+		msmsdcc_disable_clocks(host, 1);
+#endif
 	}
 	return 0;
 }