openwrtv4/target/linux/brcm2708/patches-3.10/014-bcm2708-sdhci-driver.patch

--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1294,7 +1294,7 @@ static void mmc_blk_rw_rq_prep(struct mm
 			brq->data.blocks = 1;
 	}
 
-	if (brq->data.blocks > 1 || do_rel_wr) {
+	if (brq->data.blocks > 1 || do_rel_wr || card->host->caps2 & MMC_CAP2_FORCE_MULTIBLOCK) {
 		/* SPI multiblock writes terminate using a special
 		 * token, not a STOP_TRANSMISSION request.
 		 */
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -13,6 +13,8 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/stat.h>
+#include <linux/jiffies.h>
+#include <linux/nmi.h>
 
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
@@ -58,6 +60,15 @@ static const unsigned int tacc_mant[] =
 		__res & __mask;						\
 	})
 
+// timeout for tries
+static const unsigned long retry_timeout_ms= 10*1000;
+
+// try at least 10 times, even if timeout is reached
+static const int retry_min_tries= 10;
+
+// delay between tries
+static const unsigned long retry_delay_ms= 10;
+
 /*
  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  */
@@ -210,12 +221,62 @@ static int mmc_decode_scr(struct mmc_car
 }
 
 /*
- * Fetch and process SD Status register.
+ * Fetch and process SD Configuration Register.
+ */
+static int mmc_read_scr(struct mmc_card *card)
+{
+	unsigned long timeout_at;
+	int err, tries;
+
+	timeout_at= jiffies + msecs_to_jiffies( retry_timeout_ms );
+	tries= 		0;
+
+	while( tries < retry_min_tries || time_before( jiffies, timeout_at ) )
+	{
+		unsigned long delay_at;
+		tries++;
+
+		err = mmc_app_send_scr(card, card->raw_scr);
+		if( !err )
+			break; // success!!!
+
+		touch_nmi_watchdog();	  // we are still alive!
+
+		// delay
+		delay_at= jiffies + msecs_to_jiffies( retry_delay_ms );
+		while( time_before( jiffies, delay_at ) )
+		{
+			mdelay( 1 );
+			touch_nmi_watchdog();	  // we are still alive!
+		}
+	}
+	
+	if( err)
+	{
+		pr_err("%s: failed to read SD Configuration register (SCR) after %d tries during %lu ms, error %d\n", mmc_hostname(card->host), tries, retry_timeout_ms, err );
+		return err;
+	}
+
+	if( tries > 1 )
+	{
+		pr_info("%s: could read SD Configuration register (SCR) at the %dth attempt\n", mmc_hostname(card->host), tries );
+	}
+
+	err = mmc_decode_scr(card);
+	if (err)
+		return err;
+	
+	return err;
+}
+
+/*
+ * Fetch and process SD Status Register.
  */
 static int mmc_read_ssr(struct mmc_card *card)
 {
+	unsigned long timeout_at;
 	unsigned int au, es, et, eo;
-	int err, i;
+	int err, i, tries;
 	u32 *ssr;
 
 	if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
@@ -228,14 +289,40 @@ static int mmc_read_ssr(struct mmc_card
 	if (!ssr)
 		return -ENOMEM;
 
+	timeout_at= jiffies + msecs_to_jiffies( retry_timeout_ms );
+	tries= 		0;
+	
+	while( tries < retry_min_tries || time_before( jiffies, timeout_at ) )
+	{
+		unsigned long delay_at;
+		tries++;
+		
 	err = mmc_app_sd_status(card, ssr);
-	if (err) {
-		pr_warning("%s: problem reading SD Status "
-			"register.\n", mmc_hostname(card->host));
-		err = 0;
+		if( !err )
+			break; // sucess!!!
+	
+		touch_nmi_watchdog();	  // we are still alive!
+	
+		// delay
+		delay_at= jiffies + msecs_to_jiffies( retry_delay_ms );
+		while( time_before( jiffies, delay_at ) )
+		{
+			mdelay( 1 );
+			touch_nmi_watchdog();	  // we are still alive!
+		}			
+	}
+	
+	if( err) 
+	{
+		pr_err("%s: failed to read SD Status register (SSR) after %d tries during %lu ms, error %d\n", mmc_hostname(card->host), tries, retry_timeout_ms, err );
 		goto out;
 	}
 
+	if( tries > 1 )
+	{
+		pr_info("%s: read SD Status register (SSR) after %d attempts\n", mmc_hostname(card->host), tries );
+	}
+
 	for (i = 0; i < 16; i++)
 		ssr[i] = be32_to_cpu(ssr[i]);
 
@@ -808,13 +895,9 @@ int mmc_sd_setup_card(struct mmc_host *h
 
 	if (!reinit) {
 		/*
-		 * Fetch SCR from card.
+		 * Fetch and decode SD Configuration register.
 		 */
-		err = mmc_app_send_scr(card, card->raw_scr);
-		if (err)
-			return err;
-
-		err = mmc_decode_scr(card);
+	  	err = mmc_read_scr(card);
 		if (err)
 			return err;
 
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -249,6 +249,27 @@ config MMC_SDHCI_S3C_DMA
 
 	  YMMV.
 
+config MMC_SDHCI_BCM2708
+	tristate "SDHCI support on BCM2708"
+	depends on MMC_SDHCI && MACH_BCM2708
+	select MMC_SDHCI_IO_ACCESSORS
+	help
+	  This selects the Secure Digital Host Controller Interface (SDHCI)
+	  often referrered to as the eMMC block.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
+config MMC_SDHCI_BCM2708_DMA
+	bool "DMA support on BCM2708 Arasan controller"
+	depends on MMC_SDHCI_BCM2708
+	help
+	Enable DMA support on the Arasan SDHCI controller in Broadcom 2708
+	  based chips.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_BCM2835
 	tristate "SDHCI platform support for the BCM2835 SD/MMC Controller"
 	depends on ARCH_BCM2835
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV2)	+= sdhci-p
 obj-$(CONFIG_MMC_SDHCI_S3C)	+= sdhci-s3c.o
 obj-$(CONFIG_MMC_SDHCI_SIRF)   	+= sdhci-sirf.o
 obj-$(CONFIG_MMC_SDHCI_SPEAR)	+= sdhci-spear.o
+obj-$(CONFIG_MMC_SDHCI_BCM2708)	+= sdhci-bcm2708.o
 obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
 obj-$(CONFIG_MMC_OMAP)		+= omap.o
--- /dev/null
+++ b/drivers/mmc/host/sdhci-bcm2708.c
@@ -0,0 +1,1420 @@
+/*
+ * sdhci-bcm2708.c Support for SDHCI device on BCM2708
+ * Copyright (c) 2010 Broadcom
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * SDHCI platform device - Arasan SD controller in BCM2708
+ *
+ * Inspired by sdhci-pci.c, by Pierre Ossman
+ */
+
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/sd.h>
+
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <mach/dma.h>
+
+#include "sdhci.h"
+
+/*****************************************************************************\
+ *									     *
+ * Configuration							     *
+ *									     *
+\*****************************************************************************/
+
+#define DRIVER_NAME "bcm2708_sdhci"
+
+/* for the time being insist on DMA mode - PIO seems not to work */
+#ifndef CONFIG_MMC_SDHCI_BCM2708_DMA
+#warning Non-DMA (PIO) version of this driver currently unavailable
+#endif
+#undef CONFIG_MMC_SDHCI_BCM2708_DMA
+#define CONFIG_MMC_SDHCI_BCM2708_DMA y
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+/* #define CHECK_DMA_USE */
+#endif
+//#define LOG_REGISTERS
+
+#define USE_SCHED_TIME
+#define USE_SPACED_WRITES_2CLK 1  /* space consecutive register writes */
+#define USE_SOFTWARE_TIMEOUTS 1   /* not hardware timeouts */
+#define SOFTWARE_ERASE_TIMEOUT_SEC 30
+
+#define SDHCI_BCM_DMA_CHAN 4   /* this default is normally overriden */
+#define SDHCI_BCM_DMA_WAITS 0  /* delays slowing DMA transfers: 0-31 */
+/* We are worried that SD card DMA use may be blocking the AXI bus for others */
+
+/*! TODO: obtain these from the physical address */
+#define DMA_SDHCI_BASE	 0x7e300000  /* EMMC register block on Videocore */
+#define DMA_SDHCI_BUFFER (DMA_SDHCI_BASE + SDHCI_BUFFER)
+
+#define BCM2708_SDHCI_SLEEP_TIMEOUT 1000   /* msecs */
+
+/* Mhz clock that the EMMC core is running at. Should match the platform clockman settings */
+#define BCM2708_EMMC_CLOCK_FREQ 50000000
+
+#define REG_EXRDFIFO_EN     0x80
+#define REG_EXRDFIFO_CFG    0x84
+
+int cycle_delay=2;
+
+/*****************************************************************************\
+ *									     *
+ * Debug								     *
+ *									     *
+\*****************************************************************************/
+
+
+
+#define DBG(f, x...) \
+	pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
+//	printk(KERN_INFO DRIVER_NAME " [%s()]: " f, __func__,## x)//GRAYG
+
+
+/*****************************************************************************\
+ *									     *
+ * High Precision Time							     *
+ *									     *
+\*****************************************************************************/
+
+#ifdef USE_SCHED_TIME
+
+#include <mach/frc.h>
+
+typedef unsigned long hptime_t;
+
+#define FMT_HPT "lu"
+
+static inline hptime_t hptime(void)
+{
+	return frc_clock_ticks32();
+}
+
+#define HPTIME_CLK_NS 1000ul
+
+#else
+
+typedef unsigned long hptime_t;
+
+#define FMT_HPT "lu"
+
+static inline hptime_t hptime(void)
+{
+	return jiffies;
+}
+
+#define HPTIME_CLK_NS (1000000000ul/HZ)
+
+#endif
+
+static inline unsigned long int since_ns(hptime_t t)
+{
+	return (unsigned long)((hptime() - t) * HPTIME_CLK_NS);
+}
+
+static bool allow_highspeed = 1;
+static int emmc_clock_freq = BCM2708_EMMC_CLOCK_FREQ;
+static bool sync_after_dma = 1;
+static bool missing_status = 1;
+static bool spurious_crc_acmd51 = 0;
+bool enable_llm = 1;
+bool extra_messages = 0;
+
+#if 0
+static void hptime_test(void)
+{
+	hptime_t now;
+	hptime_t later;
+
+	now = hptime();
+	msleep(10);
+	later = hptime();
+
+	printk(KERN_INFO DRIVER_NAME": 10ms = %"FMT_HPT" clks "
+	       "(from %"FMT_HPT" to %"FMT_HPT") = %luns\n",
+	       later-now, now, later,
+	       (unsigned long)(HPTIME_CLK_NS * (later - now)));
+
+	now = hptime();
+	msleep(1000);
+	later = hptime();
+
+	printk(KERN_INFO DRIVER_NAME": 1s = %"FMT_HPT" clks "
+	       "(from %"FMT_HPT" to %"FMT_HPT") = %luns\n",
+	       later-now, now, later,
+	       (unsigned long)(HPTIME_CLK_NS * (later - now)));
+}
+#endif
+
+/*****************************************************************************\
+ *									     *
+ * SDHCI core callbacks							     *
+ *									     *
+\*****************************************************************************/
+
+
+#ifdef CHECK_DMA_USE
+/*#define CHECK_DMA_REG_USE*/
+#endif
+
+#ifdef CHECK_DMA_REG_USE
+/* we don't expect anything to be using these registers during a
+   DMA (except the IRQ status) - so check */
+static void check_dma_reg_use(struct sdhci_host *host, int reg);
+#else
+#define check_dma_reg_use(host, reg)
+#endif
+
+
+static inline u32 sdhci_bcm2708_raw_readl(struct sdhci_host *host, int reg)
+{
+	return readl(host->ioaddr + reg);
+}
+
+u32 sdhci_bcm2708_readl(struct sdhci_host *host, int reg)
+{
+	u32 l = sdhci_bcm2708_raw_readl(host, reg);
+
+#ifdef LOG_REGISTERS
+	printk(KERN_ERR "%s: readl from 0x%02x, value 0x%08x\n",
+	       mmc_hostname(host->mmc), reg, l);
+#endif
+	check_dma_reg_use(host, reg);
+
+	return l;
+}
+
+u16 sdhci_bcm2708_readw(struct sdhci_host *host, int reg)
+{
+	u32 l = sdhci_bcm2708_raw_readl(host, reg & ~3);
+	u32 w = l >> (reg << 3 & 0x18) & 0xffff;
+
+#ifdef LOG_REGISTERS
+	printk(KERN_ERR "%s: readw from 0x%02x, value 0x%04x\n",
+	       mmc_hostname(host->mmc), reg, w);
+#endif
+	check_dma_reg_use(host, reg);
+
+	return (u16)w;
+}
+
+u8 sdhci_bcm2708_readb(struct sdhci_host *host, int reg)
+{
+	u32 l = sdhci_bcm2708_raw_readl(host, reg & ~3);
+	u32 b = l >> (reg << 3 & 0x18) & 0xff;
+
+#ifdef LOG_REGISTERS
+	printk(KERN_ERR "%s: readb from 0x%02x, value 0x%02x\n",
+	       mmc_hostname(host->mmc), reg, b);
+#endif
+	check_dma_reg_use(host, reg);
+
+	return (u8)b;
+}
+
+
+static void sdhci_bcm2708_raw_writel(struct sdhci_host *host, u32 val, int reg)
+{
+	u32 ier;
+
+#if USE_SPACED_WRITES_2CLK
+	static bool timeout_disabled = false;
+	unsigned int ns_2clk = 0;
+        
+	/* The Arasan has a bugette whereby it may lose the content of
+	 * successive writes to registers that are within two SD-card clock
+	 * cycles of each other (a clock domain crossing problem).
+	 * It seems, however, that the data register does not have this problem.
+	 * (Which is just as well - otherwise we'd have to nobble the DMA engine
+	 * too)
+	 */
+	if (reg != SDHCI_BUFFER && host->clock != 0) {
+		/* host->clock is the clock freq in Hz */
+		static hptime_t last_write_hpt;
+		hptime_t now = hptime();
+		ns_2clk = cycle_delay*1000000/(host->clock/1000);
+
+		if (now == last_write_hpt || now == last_write_hpt+1) {
+			 /* we can't guarantee any significant time has
+			  * passed - we'll have to wait anyway ! */
+			ndelay(ns_2clk);
+		} else
+		{
+			/* we must have waited at least this many ns: */
+			unsigned int ns_wait = HPTIME_CLK_NS *
+					       (last_write_hpt - now - 1);
+			if (ns_wait < ns_2clk)
+				ndelay(ns_2clk - ns_wait);
+		}
+		last_write_hpt = now;
+	}
+#if USE_SOFTWARE_TIMEOUTS
+	/* The Arasan is clocked for timeouts using the SD clock which is too
+	 * fast for ERASE commands and causes issues. So we disable timeouts
+	 * for ERASE */
+	if (host->cmd != NULL && host->cmd->opcode == MMC_ERASE &&
+            reg == (SDHCI_COMMAND & ~3)) {
+		mod_timer(&host->timer,
+                          jiffies + SOFTWARE_ERASE_TIMEOUT_SEC * HZ);
+		ier = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
+		ier &= ~SDHCI_INT_DATA_TIMEOUT;
+		writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+		timeout_disabled = true;
+		ndelay(ns_2clk);
+	} else if (timeout_disabled) {
+		ier = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
+		ier |= SDHCI_INT_DATA_TIMEOUT;
+		writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+		timeout_disabled = false;
+		ndelay(ns_2clk);
+	}
+#endif
+	writel(val, host->ioaddr + reg);
+#else
+	void __iomem * regaddr = host->ioaddr + reg;
+
+	writel(val, regaddr);
+
+	if (reg != SDHCI_BUFFER && reg != SDHCI_INT_STATUS && host->clock != 0)
+	{
+		int timeout = 100000;
+		while (val != readl(regaddr) && --timeout > 0)
+		   continue;
+
+		if (timeout <= 0)
+			printk(KERN_ERR "%s: writing 0x%X to reg 0x%X "
+			       "always gives 0x%X\n",
+			       mmc_hostname(host->mmc),
+			       val, reg, readl(regaddr));
+		BUG_ON(timeout <= 0);
+	}
+#endif
+}
+
+
+void sdhci_bcm2708_writel(struct sdhci_host *host, u32 val, int reg)
+{
+#ifdef LOG_REGISTERS
+	printk(KERN_ERR "%s: writel to 0x%02x, value 0x%08x\n",
+	       mmc_hostname(host->mmc), reg, val);
+#endif
+	check_dma_reg_use(host, reg);
+
+	sdhci_bcm2708_raw_writel(host, val, reg);
+}
+
+void sdhci_bcm2708_writew(struct sdhci_host *host, u16 val, int reg)
+{
+	static u32 shadow = 0;
+
+	u32 p = reg == SDHCI_COMMAND ? shadow :
+		       sdhci_bcm2708_raw_readl(host, reg & ~3);
+	u32 s = reg << 3 & 0x18;
+	u32 l = val << s;
+	u32 m = 0xffff << s;
+
+#ifdef LOG_REGISTERS
+	printk(KERN_ERR "%s: writew to 0x%02x, value 0x%04x\n",
+	       mmc_hostname(host->mmc), reg, val);
+#endif
+
+	if (reg == SDHCI_TRANSFER_MODE)
+		shadow = (p & ~m) | l;
+	else {
+		check_dma_reg_use(host, reg);
+		sdhci_bcm2708_raw_writel(host, (p & ~m) | l, reg & ~3);
+	}
+}
+
+void sdhci_bcm2708_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+	u32 p = sdhci_bcm2708_raw_readl(host, reg & ~3);
+	u32 s = reg << 3 & 0x18;
+	u32 l = val << s;
+	u32 m = 0xff << s;
+
+#ifdef LOG_REGISTERS
+	printk(KERN_ERR "%s: writeb to 0x%02x, value 0x%02x\n",
+	       mmc_hostname(host->mmc), reg, val);
+#endif
+
+       check_dma_reg_use(host, reg);
+       sdhci_bcm2708_raw_writel(host, (p & ~m) | l, reg & ~3);
+}
+
+static unsigned int sdhci_bcm2708_get_max_clock(struct sdhci_host *host)
+{
+	return emmc_clock_freq;
+}
+
+/*****************************************************************************\
+ *									     *
+ * DMA Operation							     *
+ *									     *
+\*****************************************************************************/
+
+struct sdhci_bcm2708_priv {
+	int			dma_chan;
+	int			dma_irq;
+	void __iomem	       *dma_chan_base;
+	struct bcm2708_dma_cb  *cb_base;   /* DMA control blocks */
+	dma_addr_t		cb_handle;
+	/* tracking scatter gather progress */
+	unsigned		sg_ix;	   /* scatter gather list index */
+	unsigned		sg_done;   /* bytes in current sg_ix done */
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	unsigned char		dma_wanted;  /* DMA transfer requested */
+	unsigned char		dma_waits;   /* wait states in DMAs */
+#ifdef CHECK_DMA_USE
+	unsigned char		dmas_pending; /* no of unfinished DMAs */
+	hptime_t		when_started;
+	hptime_t		when_reset;
+	hptime_t		when_stopped;
+#endif
+#endif
+	/* signalling the end of a transfer */
+	void		      (*complete)(struct sdhci_host *);
+};
+
+#define SDHCI_HOST_PRIV(host) \
+	(struct sdhci_bcm2708_priv *)((struct sdhci_host *)(host)+1)
+
+
+
+#ifdef CHECK_DMA_REG_USE
+static void check_dma_reg_use(struct sdhci_host *host, int reg)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	if (host_priv->dma_wanted && reg != SDHCI_INT_STATUS) {
+		printk(KERN_INFO"%s: accessing register 0x%x during DMA\n",
+		       mmc_hostname(host->mmc), reg);
+	}
+}
+#endif
+
+
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+
+static void sdhci_clear_set_irqgen(struct sdhci_host *host, u32 clear, u32 set)
+{
+	u32 ier;
+
+	ier = sdhci_bcm2708_raw_readl(host, SDHCI_SIGNAL_ENABLE);
+	ier &= ~clear;
+	ier |= set;
+	/* change which requests generate IRQs - makes no difference to
+	   the content of SDHCI_INT_STATUS, or the need to acknowledge IRQs */
+	sdhci_bcm2708_raw_writel(host, ier, SDHCI_SIGNAL_ENABLE);
+}
+
+static void sdhci_signal_irqs(struct sdhci_host *host, u32 irqs)
+{
+	sdhci_clear_set_irqgen(host, 0, irqs);
+}
+
+static void sdhci_unsignal_irqs(struct sdhci_host *host, u32 irqs)
+{
+	sdhci_clear_set_irqgen(host, irqs, 0);
+}
+
+
+
+static void schci_bcm2708_cb_read(struct sdhci_bcm2708_priv *host,
+				  int ix,
+				  dma_addr_t dma_addr, unsigned len,
+				  int /*bool*/ is_last)
+{
+	struct bcm2708_dma_cb *cb = &host->cb_base[ix];
+        unsigned char dmawaits = host->dma_waits;
+
+	cb->info   = BCM2708_DMA_PER_MAP(BCM2708_DMA_DREQ_EMMC) |
+		     BCM2708_DMA_WAITS(dmawaits) |
+		     BCM2708_DMA_S_DREQ	 |
+		     BCM2708_DMA_D_WIDTH |
+		     BCM2708_DMA_D_INC;
+	cb->src	   = DMA_SDHCI_BUFFER;	/* DATA register DMA address */
+	cb->dst	   = dma_addr;
+	cb->length = len;
+	cb->stride = 0;
+
+	if (is_last) {
+		cb->info |= BCM2708_DMA_INT_EN |
+		     BCM2708_DMA_WAIT_RESP;
+		cb->next = 0;
+	} else
+		cb->next = host->cb_handle +
+			   (ix+1)*sizeof(struct bcm2708_dma_cb);
+
+	cb->pad[0] = 0;
+	cb->pad[1] = 0;
+}
+
+static void schci_bcm2708_cb_write(struct sdhci_bcm2708_priv *host,
+				   int ix,
+				   dma_addr_t dma_addr, unsigned len,
+				   int /*bool*/ is_last)
+{
+	struct bcm2708_dma_cb *cb = &host->cb_base[ix];
+        unsigned char dmawaits = host->dma_waits;
+
+	/* We can make arbitrarily large writes as long as we specify DREQ to
+	   pace the delivery of bytes to the Arasan hardware */
+	cb->info   = BCM2708_DMA_PER_MAP(BCM2708_DMA_DREQ_EMMC) |
+		     BCM2708_DMA_WAITS(dmawaits) |
+		     BCM2708_DMA_D_DREQ	 |
+		     BCM2708_DMA_S_WIDTH |
+		     BCM2708_DMA_S_INC;
+	cb->src	   = dma_addr;
+	cb->dst	   = DMA_SDHCI_BUFFER;	/* DATA register DMA address */
+	cb->length = len;
+	cb->stride = 0;
+
+	if (is_last) {
+		cb->info |= BCM2708_DMA_INT_EN |
+		     BCM2708_DMA_WAIT_RESP;
+		cb->next = 0;
+	} else
+		cb->next = host->cb_handle +
+			   (ix+1)*sizeof(struct bcm2708_dma_cb);
+
+	cb->pad[0] = 0;
+	cb->pad[1] = 0;
+}
+
+
+static void schci_bcm2708_dma_go(struct sdhci_host *host)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	void __iomem *dma_chan_base = host_priv->dma_chan_base;
+
+	BUG_ON(host_priv->dma_wanted);
+#ifdef CHECK_DMA_USE
+	if (host_priv->dma_wanted)
+		printk(KERN_ERR "%s: DMA already in progress - "
+		       "now %"FMT_HPT", last started %lu "
+		       "reset %lu stopped %lu\n",
+		       mmc_hostname(host->mmc),
+		       hptime(), since_ns(host_priv->when_started),
+		       since_ns(host_priv->when_reset),
+		       since_ns(host_priv->when_stopped));
+	else if (host_priv->dmas_pending > 0)
+		printk(KERN_INFO "%s: note - new DMA when %d reset DMAs "
+		       "already in progress - "
+		       "now %"FMT_HPT", started %lu reset %lu stopped %lu\n",
+		       mmc_hostname(host->mmc),
+		       host_priv->dmas_pending,
+		       hptime(), since_ns(host_priv->when_started),
+		       since_ns(host_priv->when_reset),
+		       since_ns(host_priv->when_stopped));
+	host_priv->dmas_pending += 1;
+	host_priv->when_started = hptime();
+#endif
+	host_priv->dma_wanted = 1;
+	DBG("PDMA go - base %p handle %08X\n", dma_chan_base,
+	    host_priv->cb_handle);
+	bcm_dma_start(dma_chan_base, host_priv->cb_handle);
+}
+
+
+static void
+sdhci_platdma_read(struct sdhci_host *host, dma_addr_t dma_addr, size_t len)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+
+	DBG("PDMA to read %d bytes\n", len);
+	host_priv->sg_done += len;
+	schci_bcm2708_cb_read(host_priv, 0, dma_addr, len, 1/*TRUE*/);
+	schci_bcm2708_dma_go(host);
+}
+
+
+static void
+sdhci_platdma_write(struct sdhci_host *host, dma_addr_t dma_addr, size_t len)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+
+	DBG("PDMA to write %d bytes\n", len);
+	//BUG_ON(0 != (len & 0x1ff));
+
+	host_priv->sg_done += len;
+	schci_bcm2708_cb_write(host_priv, 0, dma_addr, len, 1/*TRUE*/);
+	schci_bcm2708_dma_go(host);
+}
+
+/*! space is avaiable to receive into or data is available to write
+  Platform DMA exported function
+*/
+void
+sdhci_bcm2708_platdma_avail(struct sdhci_host *host, unsigned int *ref_intmask,
+			    void(*completion_callback)(struct sdhci_host *host))
+{
+	struct mmc_data *data = host->data;
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	int sg_ix;
+	size_t bytes;
+	dma_addr_t addr;
+
+	BUG_ON(NULL == data);
+	BUG_ON(0 == data->blksz);
+
+	host_priv->complete = completion_callback;
+
+	sg_ix = host_priv->sg_ix;
+	BUG_ON(sg_ix >= data->sg_len);
+
+	/* we can DMA blocks larger than blksz - it may hang the DMA
+	   channel but we are its only user */
+	bytes = sg_dma_len(&data->sg[sg_ix]) - host_priv->sg_done;
+	addr = sg_dma_address(&data->sg[sg_ix]) + host_priv->sg_done;
+
+	if (bytes > 0) {
+		/* We're going to poll for read/write available state until
+		   we finish this DMA
+		*/
+
+		if (data->flags & MMC_DATA_READ) {
+			if (*ref_intmask & SDHCI_INT_DATA_AVAIL)  {
+				sdhci_unsignal_irqs(host, SDHCI_INT_DATA_AVAIL |
+						    SDHCI_INT_SPACE_AVAIL);
+				sdhci_platdma_read(host, addr, bytes);
+			}
+		} else {
+			if (*ref_intmask & SDHCI_INT_SPACE_AVAIL) {
+				sdhci_unsignal_irqs(host, SDHCI_INT_DATA_AVAIL |
+						    SDHCI_INT_SPACE_AVAIL);
+				sdhci_platdma_write(host, addr, bytes);
+			}
+		}
+	}
+	/* else:
+	   we have run out of bytes that need transferring (e.g. we may be in
+	   the middle of the last DMA transfer), or
+	   it is also possible that we've been called when another IRQ is
+	   signalled, even though we've turned off signalling of our own IRQ */
+
+	*ref_intmask &= ~SDHCI_INT_DATA_END;
+	/* don't let the main sdhci driver act on this .. we'll deal with it
+	   when we respond to the DMA - if one is currently in progress */
+}
+
+/* is it possible to DMA the given mmc_data structure?
+   Platform DMA exported function
+*/
+int /*bool*/
+sdhci_bcm2708_platdma_dmaable(struct sdhci_host *host, struct mmc_data *data)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	int ok = bcm_sg_suitable_for_dma(data->sg, data->sg_len);
+
+	if (!ok)
+		DBG("Reverting to PIO - bad cache alignment\n");
+
+	else {
+		host_priv->sg_ix = 0;	 /* first SG index */
+		host_priv->sg_done = 0;	 /* no bytes done */
+	}
+
+	return ok;
+}
+
+#include <mach/arm_control.h> //GRAYG
+/*! the current SD transacton has been abandonned
+  We need to tidy up if we were in the middle of a DMA
+  Platform DMA exported function
+*/
+void
+sdhci_bcm2708_platdma_reset(struct sdhci_host *host, struct mmc_data *data)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+//	unsigned long flags;
+
+	BUG_ON(NULL == host);
+
+//	spin_lock_irqsave(&host->lock, flags);
+
+	if (host_priv->dma_wanted) {
+		if (NULL == data) {
+			printk(KERN_ERR "%s: ongoing DMA reset - no data!\n",
+			       mmc_hostname(host->mmc));
+			BUG_ON(NULL == data);
+		} else {
+			struct scatterlist *sg;
+			int sg_len;
+			int sg_todo;
+			int rc;
+			unsigned long cs;
+
+			sg = data->sg;
+			sg_len = data->sg_len;
+			sg_todo = sg_dma_len(&sg[host_priv->sg_ix]);
+
+			cs = readl(host_priv->dma_chan_base + BCM2708_DMA_CS);
+
+			if (!(BCM2708_DMA_ACTIVE & cs))
+			{
+				if (extra_messages)
+					printk(KERN_INFO "%s: missed completion of "
+				       "cmd %d DMA (%d/%d [%d]/[%d]) - "
+				       "ignoring it\n",
+				       mmc_hostname(host->mmc),
+				       host->last_cmdop,
+				       host_priv->sg_done, sg_todo,
+				       host_priv->sg_ix+1, sg_len);
+			}
+			else
+				printk(KERN_INFO "%s: resetting ongoing cmd %d"
+				       "DMA before %d/%d [%d]/[%d] complete\n",
+				       mmc_hostname(host->mmc),
+				       host->last_cmdop,
+				       host_priv->sg_done, sg_todo,
+				       host_priv->sg_ix+1, sg_len);
+#ifdef CHECK_DMA_USE
+			printk(KERN_INFO "%s: now %"FMT_HPT" started %lu "
+			       "last reset %lu last stopped %lu\n",
+			       mmc_hostname(host->mmc),
+			       hptime(), since_ns(host_priv->when_started),
+			       since_ns(host_priv->when_reset),
+			       since_ns(host_priv->when_stopped));
+			{	unsigned long info, debug;
+				void __iomem *base;
+				unsigned long pend0, pend1, pend2;
+				   
+				base = host_priv->dma_chan_base;
+				cs = readl(base + BCM2708_DMA_CS);
+				info = readl(base + BCM2708_DMA_INFO);
+				debug = readl(base + BCM2708_DMA_DEBUG);
+				printk(KERN_INFO "%s: DMA%d CS=%08lX TI=%08lX "
+				       "DEBUG=%08lX\n",
+				       mmc_hostname(host->mmc),
+                                       host_priv->dma_chan,
+				       cs, info, debug);
+				pend0 = readl(__io_address(ARM_IRQ_PEND0));
+				pend1 = readl(__io_address(ARM_IRQ_PEND1));
+				pend2 = readl(__io_address(ARM_IRQ_PEND2));
+				
+				printk(KERN_INFO "%s: PEND0=%08lX "
+				       "PEND1=%08lX PEND2=%08lX\n",
+				       mmc_hostname(host->mmc),
+				       pend0, pend1, pend2);
+				
+				//gintsts = readl(__io_address(GINTSTS));
+				//gintmsk = readl(__io_address(GINTMSK));
+				//printk(KERN_INFO "%s: USB GINTSTS=%08lX"
+				//	 "GINTMSK=%08lX\n",
+				//	 mmc_hostname(host->mmc), gintsts, gintmsk);
+			}
+#endif
+			rc = bcm_dma_abort(host_priv->dma_chan_base);
+			BUG_ON(rc != 0);
+		}
+		host_priv->dma_wanted = 0;
+#ifdef CHECK_DMA_USE
+		host_priv->when_reset = hptime();
+#endif
+	}
+
+//	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+
+static void sdhci_bcm2708_dma_complete_irq(struct sdhci_host *host,
+					   u32 dma_cs)
+{
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	struct mmc_data *data;
+	struct scatterlist *sg;
+	int sg_len;
+	int sg_ix;
+	int sg_todo;
+//	unsigned long flags;
+
+	BUG_ON(NULL == host);
+
+//	spin_lock_irqsave(&host->lock, flags);
+	data = host->data;
+
+#ifdef CHECK_DMA_USE
+	if (host_priv->dmas_pending <= 0)
+		DBG("on completion no DMA in progress - "
+		    "now %"FMT_HPT" started %lu reset %lu stopped %lu\n",
+		    hptime(), since_ns(host_priv->when_started),
+		    since_ns(host_priv->when_reset),
+		    since_ns(host_priv->when_stopped));
+	else if (host_priv->dmas_pending > 1)
+		DBG("still %d DMA in progress after completion - "
+		    "now %"FMT_HPT" started %lu reset %lu stopped %lu\n",
+		    host_priv->dmas_pending - 1,
+		    hptime(), since_ns(host_priv->when_started),
+		    since_ns(host_priv->when_reset),
+		    since_ns(host_priv->when_stopped));
+	BUG_ON(host_priv->dmas_pending <= 0);
+	host_priv->dmas_pending -= 1;
+	host_priv->when_stopped = hptime();
+#endif
+	host_priv->dma_wanted = 0;
+
+	if (NULL == data) {
+		DBG("PDMA unused completion - status 0x%X\n", dma_cs);
+//		spin_unlock_irqrestore(&host->lock, flags);
+		return;
+	}
+	sg = data->sg;
+	sg_len = data->sg_len;
+	sg_todo = sg_dma_len(&sg[host_priv->sg_ix]);
+
+	DBG("PDMA complete %d/%d [%d]/[%d]..\n",
+	    host_priv->sg_done, sg_todo,
+	    host_priv->sg_ix+1, sg_len);
+
+	BUG_ON(host_priv->sg_done > sg_todo);
+
+	if (host_priv->sg_done >= sg_todo) {
+		host_priv->sg_ix++;
+		host_priv->sg_done = 0;
+	}
+
+	sg_ix = host_priv->sg_ix;
+	if (sg_ix < sg_len) {
+		u32 irq_mask;
+		/* Set off next DMA if we've got the capacity */
+
+		if (data->flags & MMC_DATA_READ)
+			irq_mask = SDHCI_INT_DATA_AVAIL;
+		else
+			irq_mask = SDHCI_INT_SPACE_AVAIL;
+
+		/* We have to use the interrupt status register on the BCM2708
+		   rather than the SDHCI_PRESENT_STATE register because latency
+		   in the glue logic means that the information retrieved from
+		   the latter is not always up-to-date w.r.t the DMA engine -
+		   it may not indicate that a read or a write is ready yet */
+		if (sdhci_bcm2708_raw_readl(host, SDHCI_INT_STATUS) &
+		    irq_mask) {
+			size_t bytes = sg_dma_len(&sg[sg_ix]) -
+				       host_priv->sg_done;
+			dma_addr_t addr = sg_dma_address(&data->sg[sg_ix]) +
+					  host_priv->sg_done;
+
+			/* acknowledge interrupt */
+			sdhci_bcm2708_raw_writel(host, irq_mask,
+						 SDHCI_INT_STATUS);
+
+			BUG_ON(0 == bytes);
+
+			if (data->flags & MMC_DATA_READ)
+				sdhci_platdma_read(host, addr, bytes);
+			else
+				sdhci_platdma_write(host, addr, bytes);
+		} else {
+			DBG("PDMA - wait avail\n");
+			/* may generate an IRQ if already present */
+			sdhci_signal_irqs(host, SDHCI_INT_DATA_AVAIL |
+						SDHCI_INT_SPACE_AVAIL);
+		}
+	} else {
+		if (sync_after_dma) {
+			/* On the Arasan controller the stop command (which will be
+			   scheduled after this completes) does not seem to work
+			   properly if we allow it to be issued when we are
+			   transferring data to/from the SD card.
+			   We get CRC and DEND errors unless we wait for
+			   the SD controller to finish reading/writing to the card. */
+			u32 state_mask;
+			int timeout=30*5000;
+
+			DBG("PDMA over - sync card\n");
+			if (data->flags & MMC_DATA_READ)
+				state_mask = SDHCI_DOING_READ;
+			else
+				state_mask = SDHCI_DOING_WRITE;
+
+			while (0 != (sdhci_bcm2708_raw_readl(host, SDHCI_PRESENT_STATE) 
+				& state_mask) && --timeout > 0)
+			{
+				udelay(1);
+				continue;
+			}
+			if (timeout <= 0)
+				printk(KERN_ERR"%s: final %s to SD card still "
+				       "running\n",
+				       mmc_hostname(host->mmc),
+				       data->flags & MMC_DATA_READ? "read": "write");
+		}
+		if (host_priv->complete) {
+			(*host_priv->complete)(host);
+			DBG("PDMA %s complete\n",
+			    data->flags & MMC_DATA_READ?"read":"write");
+			sdhci_signal_irqs(host, SDHCI_INT_DATA_AVAIL |
+						SDHCI_INT_SPACE_AVAIL);
+		}
+	}
+//	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static irqreturn_t sdhci_bcm2708_dma_irq(int irq, void *dev_id)
+{
+	irqreturn_t result = IRQ_NONE;
+	struct sdhci_host *host = dev_id;
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	u32 dma_cs; /* control and status register */
+
+	BUG_ON(NULL == dev_id);
+	BUG_ON(NULL == host_priv->dma_chan_base);
+
+	sdhci_spin_lock(host);
+
+	dma_cs = readl(host_priv->dma_chan_base + BCM2708_DMA_CS);
+
+	if (dma_cs & BCM2708_DMA_ERR) {
+		unsigned long debug;
+		debug = readl(host_priv->dma_chan_base +
+			      BCM2708_DMA_DEBUG);
+		printk(KERN_ERR "%s: DMA error - CS %lX DEBUG %lX\n",
+		       mmc_hostname(host->mmc), (unsigned long)dma_cs,
+		       (unsigned long)debug);
+		/* reset error */
+		writel(debug, host_priv->dma_chan_base +
+		       BCM2708_DMA_DEBUG);
+	}
+	if (dma_cs & BCM2708_DMA_INT) {
+		/* acknowledge interrupt */
+		writel(BCM2708_DMA_INT,
+		       host_priv->dma_chan_base + BCM2708_DMA_CS);
+
+		dsb(); /* ARM data synchronization (push) operation */
+
+		if (!host_priv->dma_wanted) {
+			/* ignore this interrupt - it was reset */
+			if (extra_messages)
+				printk(KERN_INFO "%s: DMA IRQ %X ignored - "
+			       "results were reset\n",
+			       mmc_hostname(host->mmc), dma_cs);
+#ifdef CHECK_DMA_USE
+			printk(KERN_INFO "%s: now %"FMT_HPT
+			       " started %lu reset %lu stopped %lu\n",
+			       mmc_hostname(host->mmc), hptime(),
+			       since_ns(host_priv->when_started),
+			       since_ns(host_priv->when_reset),
+			       since_ns(host_priv->when_stopped));
+			host_priv->dmas_pending--;
+#endif
+		} else
+			sdhci_bcm2708_dma_complete_irq(host, dma_cs);
+
+		result = IRQ_HANDLED;
+	}
+	sdhci_spin_unlock(host);
+
+	return result;
+}
+#endif /* CONFIG_MMC_SDHCI_BCM2708_DMA */
+
+
+/***************************************************************************** \
+ *									     *
+ * Device Attributes							     *
+ *									     *
+\*****************************************************************************/
+
+
+/**
+ * Show the DMA-using status
+ */
+static ssize_t attr_dma_show(struct device *_dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct sdhci_host *host = (struct sdhci_host *)dev_get_drvdata(_dev);
+
+	if (host) {
+		int use_dma = (host->flags & SDHCI_USE_PLATDMA? 1:0);
+		return sprintf(buf, "%d\n", use_dma);
+	} else
+		return -EINVAL;
+}
+
+/**
+ * Set the DMA-using status
+ */
+static ssize_t attr_dma_store(struct device *_dev,
+			      struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct sdhci_host *host = (struct sdhci_host *)dev_get_drvdata(_dev);
+
+	if (host) {
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+		int on = simple_strtol(buf, NULL, 0);
+		if (on) {
+			host->flags |= SDHCI_USE_PLATDMA;
+			sdhci_bcm2708_writel(host, 1, REG_EXRDFIFO_EN);
+			printk(KERN_INFO "%s: DMA enabled\n",
+			       mmc_hostname(host->mmc));
+		} else {
+			host->flags &= ~(SDHCI_USE_PLATDMA | SDHCI_REQ_USE_DMA);
+			sdhci_bcm2708_writel(host, 0, REG_EXRDFIFO_EN);
+			printk(KERN_INFO "%s: DMA disabled\n",
+			       mmc_hostname(host->mmc));
+		}
+#endif
+		return count;
+	} else
+		return -EINVAL;
+}
+
+static DEVICE_ATTR(use_dma, S_IRUGO | S_IWUGO, attr_dma_show, attr_dma_store);
+
+
+/**
+ * Show the DMA wait states used
+ */
+static ssize_t attr_dmawait_show(struct device *_dev,
+			         struct device_attribute *attr, char *buf)
+{
+	struct sdhci_host *host = (struct sdhci_host *)dev_get_drvdata(_dev);
+
+	if (host) {
+		struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+		int dmawait = host_priv->dma_waits;
+		return sprintf(buf, "%d\n", dmawait);
+	} else
+		return -EINVAL;
+}
+
+/**
+ * Set the DMA wait state used
+ */
+static ssize_t attr_dmawait_store(struct device *_dev,
+			          struct device_attribute *attr,
+    			          const char *buf, size_t count)
+{
+	struct sdhci_host *host = (struct sdhci_host *)dev_get_drvdata(_dev);
+
+	if (host) {
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+		struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+		int dma_waits = simple_strtol(buf, NULL, 0);
+		if (dma_waits >= 0 && dma_waits < 32) 
+                        host_priv->dma_waits = dma_waits;
+		else
+			printk(KERN_ERR "%s: illegal dma_waits value - %d",
+			       mmc_hostname(host->mmc), dma_waits);
+#endif
+		return count;
+	} else
+		return -EINVAL;
+}
+
+static DEVICE_ATTR(dma_wait, S_IRUGO | S_IWUGO,
+                   attr_dmawait_show, attr_dmawait_store);
+
+
+/**
+ * Show the DMA-using status
+ */
+static ssize_t attr_status_show(struct device *_dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct sdhci_host *host = (struct sdhci_host *)dev_get_drvdata(_dev);
+
+	if (host) {
+		struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+		return sprintf(buf,
+			       "present: yes\n"
+			       "power: %s\n"
+			       "clock: %u Hz\n"
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+			       "dma: %s (%d waits)\n",
+#else
+			       "dma: unconfigured\n",
+#endif
+			       "always on",
+			       host->clock
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+			       , (host->flags & SDHCI_USE_PLATDMA)? "on": "off"
+                               , host_priv->dma_waits
+#endif
+			       );
+	} else
+		return -EINVAL;
+}
+
+static DEVICE_ATTR(status, S_IRUGO, attr_status_show, NULL);
+
+/***************************************************************************** \
+ *									     *
+ * Power Management							     *
+ *									     *
+\*****************************************************************************/
+
+
+#ifdef CONFIG_PM
+static int sdhci_bcm2708_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct sdhci_host *host = (struct sdhci_host *)
+				  platform_get_drvdata(dev);
+	int ret = 0;
+
+	if (host->mmc) {
+		ret = mmc_suspend_host(host->mmc);
+	}
+
+	return ret;
+}
+
+static int sdhci_bcm2708_resume(struct platform_device *dev)
+{
+	struct sdhci_host *host = (struct sdhci_host *)
+				  platform_get_drvdata(dev);
+	int ret = 0;
+
+	if (host->mmc) {
+		ret = mmc_resume_host(host->mmc);
+	}
+
+	return ret;
+}
+#endif
+
+
+/*****************************************************************************\
+ *                                                                           *
+ * Device quirk functions. Implemented as local ops because the flags        *
+ * field is out of space with newer kernels. This implementation can be      *
+ * back ported to older kernels as well.                                     *
+\****************************************************************************/
+static unsigned int sdhci_bcm2708_quirk_extra_ints(struct sdhci_host *host)
+{
+        return 1;
+}
+
+static unsigned int sdhci_bcm2708_quirk_spurious_crc_acmd51(struct sdhci_host *host)
+{
+        return 1;
+}
+
+static unsigned int sdhci_bcm2708_quirk_voltage_broken(struct sdhci_host *host)
+{
+        return 1;
+}
+
+static unsigned int sdhci_bcm2708_uhs_broken(struct sdhci_host *host)
+{
+        return 1;
+}
+
+static unsigned int sdhci_bcm2708_missing_status(struct sdhci_host *host)
+{
+	return 1;
+}
+
+/***************************************************************************** \
+ *									     *
+ * Device ops								     *
+ *									     *
+\*****************************************************************************/
+
+static struct sdhci_ops sdhci_bcm2708_ops = {
+#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
+	.read_l = sdhci_bcm2708_readl,
+	.read_w = sdhci_bcm2708_readw,
+	.read_b = sdhci_bcm2708_readb,
+	.write_l = sdhci_bcm2708_writel,
+	.write_w = sdhci_bcm2708_writew,
+	.write_b = sdhci_bcm2708_writeb,
+#else
+#error The BCM2708 SDHCI driver needs CONFIG_MMC_SDHCI_IO_ACCESSORS to be set
+#endif
+	.get_max_clock = sdhci_bcm2708_get_max_clock,
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	// Platform DMA operations
+	.pdma_able  = sdhci_bcm2708_platdma_dmaable,
+	.pdma_avail = sdhci_bcm2708_platdma_avail,
+	.pdma_reset = sdhci_bcm2708_platdma_reset,
+#endif
+	.extra_ints = sdhci_bcm2708_quirk_extra_ints,
+	.voltage_broken = sdhci_bcm2708_quirk_voltage_broken,
+	.uhs_broken = sdhci_bcm2708_uhs_broken,
+};
+
+/*****************************************************************************\
+ *									     *
+ * Device probing/removal						     *
+ *									     *
+\*****************************************************************************/
+
+static int sdhci_bcm2708_probe(struct platform_device *pdev)
+{
+	struct sdhci_host *host;
+	struct resource *iomem;
+	struct sdhci_bcm2708_priv *host_priv;
+	int ret;
+
+	BUG_ON(pdev == NULL);
+
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iomem) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	if (resource_size(iomem) != 0x100)
+		dev_err(&pdev->dev, "Invalid iomem size. You may "
+			"experience problems.\n");
+
+	if (pdev->dev.parent)
+		host = sdhci_alloc_host(pdev->dev.parent,
+					sizeof(struct sdhci_bcm2708_priv));
+	else
+		host = sdhci_alloc_host(&pdev->dev,
+					sizeof(struct sdhci_bcm2708_priv));
+
+	if (IS_ERR(host)) {
+		ret = PTR_ERR(host);
+		goto err;
+	}
+	if (missing_status) {
+		sdhci_bcm2708_ops.missing_status = sdhci_bcm2708_missing_status;
+	}
+
+	if( spurious_crc_acmd51 ) {
+		sdhci_bcm2708_ops.spurious_crc_acmd51 = sdhci_bcm2708_quirk_spurious_crc_acmd51;
+	}
+
+
+	printk("sdhci: %s low-latency mode\n",enable_llm?"Enable":"Disable");
+
+	host->hw_name = "BCM2708_Arasan";
+	host->ops = &sdhci_bcm2708_ops;
+	host->irq = platform_get_irq(pdev, 0);
+	host->second_irq = 0;
+
+	host->quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
+		       SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
+		       SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
+               SDHCI_QUIRK_MISSING_CAPS |
+               SDHCI_QUIRK_NO_HISPD_BIT |
+               (sync_after_dma ? 0:SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12);
+
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	host->flags = SDHCI_USE_PLATDMA;
+#endif
+
+	if (!request_mem_region(iomem->start, resource_size(iomem),
+				mmc_hostname(host->mmc))) {
+		dev_err(&pdev->dev, "cannot request region\n");
+		ret = -EBUSY;
+		goto err_request;
+	}
+
+	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
+	if (!host->ioaddr) {
+		dev_err(&pdev->dev, "failed to remap registers\n");
+		ret = -ENOMEM;
+		goto err_remap;
+	}
+
+	host_priv = SDHCI_HOST_PRIV(host);
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	host_priv->dma_wanted = 0;
+#ifdef CHECK_DMA_USE
+	host_priv->dmas_pending = 0;
+	host_priv->when_started = 0;
+	host_priv->when_reset = 0;
+	host_priv->when_stopped = 0;
+#endif
+	host_priv->sg_ix = 0;
+	host_priv->sg_done = 0;
+	host_priv->complete = NULL;
+	host_priv->dma_waits = SDHCI_BCM_DMA_WAITS;
+
+	host_priv->cb_base = dma_alloc_writecombine(&pdev->dev, SZ_4K,
+						    &host_priv->cb_handle,
+						    GFP_KERNEL);
+	if (!host_priv->cb_base) {
+		dev_err(&pdev->dev, "cannot allocate DMA CBs\n");
+		ret = -ENOMEM;
+		goto err_alloc_cb;
+	}
+
+	ret = bcm_dma_chan_alloc(BCM_DMA_FEATURE_FAST,
+				 &host_priv->dma_chan_base,
+				 &host_priv->dma_irq);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "couldn't allocate a DMA channel\n");
+		goto err_add_dma;
+	}
+	host_priv->dma_chan = ret;
+
+	ret = request_irq(host_priv->dma_irq, sdhci_bcm2708_dma_irq,0,//IRQF_SHARED,
+			  DRIVER_NAME " (dma)", host);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot set DMA IRQ\n");
+		goto err_add_dma_irq;
+	}
+	host->second_irq = host_priv->dma_irq;
+	DBG("DMA CBs %p handle %08X DMA%d %p DMA IRQ %d\n",
+	    host_priv->cb_base, (unsigned)host_priv->cb_handle,
+	    host_priv->dma_chan, host_priv->dma_chan_base,
+	    host_priv->dma_irq);
+
+    if (allow_highspeed)
+        host->mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
+
+    /* single block writes cause data loss with some SD cards! */
+    host->mmc->caps2 |= MMC_CAP2_FORCE_MULTIBLOCK;
+#endif
+
+	ret = sdhci_add_host(host);
+	if (ret)
+		goto err_add_host;
+
+	platform_set_drvdata(pdev, host);
+	ret = device_create_file(&pdev->dev, &dev_attr_use_dma);
+	ret = device_create_file(&pdev->dev, &dev_attr_dma_wait);
+	ret = device_create_file(&pdev->dev, &dev_attr_status);
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	/* enable extension fifo for paced DMA transfers */
+	sdhci_bcm2708_writel(host, 1, REG_EXRDFIFO_EN);
+	sdhci_bcm2708_writel(host, 4, REG_EXRDFIFO_CFG);
+#endif
+
+	printk(KERN_INFO "%s: BCM2708 SDHC host at 0x%08llx DMA %d IRQ %d\n",
+	       mmc_hostname(host->mmc), (unsigned long long)iomem->start,
+	       host_priv->dma_chan, host_priv->dma_irq);
+
+	return 0;
+
+err_add_host:
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	free_irq(host_priv->dma_irq, host);
+err_add_dma_irq:
+	bcm_dma_chan_free(host_priv->dma_chan);
+err_add_dma:
+	dma_free_writecombine(&pdev->dev, SZ_4K, host_priv->cb_base,
+			      host_priv->cb_handle);
+err_alloc_cb:
+#endif
+	iounmap(host->ioaddr);
+err_remap:
+	release_mem_region(iomem->start, resource_size(iomem));
+err_request:
+	sdhci_free_host(host);
+err:
+	dev_err(&pdev->dev, "probe failed, err %d\n", ret);
+	return ret;
+}
+
+static int sdhci_bcm2708_remove(struct platform_device *pdev)
+{
+	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
+	int dead;
+	u32 scratch;
+
+	dead = 0;
+	scratch = sdhci_bcm2708_readl(host, SDHCI_INT_STATUS);
+	if (scratch == (u32)-1)
+		dead = 1;
+
+	device_remove_file(&pdev->dev, &dev_attr_status);
+	device_remove_file(&pdev->dev, &dev_attr_dma_wait);
+	device_remove_file(&pdev->dev, &dev_attr_use_dma);
+
+#ifdef CONFIG_MMC_SDHCI_BCM2708_DMA
+	free_irq(host_priv->dma_irq, host);
+	dma_free_writecombine(&pdev->dev, SZ_4K, host_priv->cb_base,
+			      host_priv->cb_handle);
+#endif
+	sdhci_remove_host(host, dead);
+	iounmap(host->ioaddr);
+	release_mem_region(iomem->start, resource_size(iomem));
+	sdhci_free_host(host);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver sdhci_bcm2708_driver = {
+	.driver = {
+		.name	= DRIVER_NAME,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= sdhci_bcm2708_probe,
+	.remove		= sdhci_bcm2708_remove,
+
+#ifdef CONFIG_PM
+	.suspend = sdhci_bcm2708_suspend,
+	.resume = sdhci_bcm2708_resume,
+#endif
+
+};
+
+/*****************************************************************************\
+ *									     *
+ * Driver init/exit							     *
+ *									     *
+\*****************************************************************************/
+
+static int __init sdhci_drv_init(void)
+{
+	return platform_driver_register(&sdhci_bcm2708_driver);
+}
+
+static void __exit sdhci_drv_exit(void)
+{
+	platform_driver_unregister(&sdhci_bcm2708_driver);
+}
+
+module_init(sdhci_drv_init);
+module_exit(sdhci_drv_exit);
+
+module_param(allow_highspeed, bool, 0444);
+module_param(emmc_clock_freq, int, 0444);
+module_param(sync_after_dma, bool, 0444);
+module_param(missing_status, bool, 0444);
+module_param(spurious_crc_acmd51, bool, 0444);
+module_param(enable_llm, bool, 0444);
+module_param(cycle_delay, int, 0444);
+module_param(extra_messages, bool, 0444);
+
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
+MODULE_AUTHOR("Broadcom <info@broadcom.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:"DRIVER_NAME);
+
+MODULE_PARM_DESC(allow_highspeed, "Allow high speed transfers modes");
+MODULE_PARM_DESC(emmc_clock_freq, "Specify the speed of emmc clock");
+MODULE_PARM_DESC(sync_after_dma, "Block in driver until dma complete");
+MODULE_PARM_DESC(missing_status, "Use the missing status quirk");
+MODULE_PARM_DESC(spurious_crc_acmd51, "Use the spurious crc quirk for reading SCR (ACMD51)");
+MODULE_PARM_DESC(enable_llm, "Enable low-latency mode");
+MODULE_PARM_DESC(extra_messages, "Enable more sdcard warning messages");
+
+
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -28,6 +28,7 @@
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/sd.h>
 #include <linux/mmc/slot-gpio.h>
 
 #include "sdhci.h"
@@ -123,6 +124,91 @@ static void sdhci_dumpregs(struct sdhci_
  * Low level functions                                                       *
  *                                                                           *
 \*****************************************************************************/
+extern bool enable_llm;
+static int sdhci_locked=0;
+void sdhci_spin_lock(struct sdhci_host *host)
+{
+	spin_lock(&host->lock);
+#ifdef CONFIG_PREEMPT
+	if(enable_llm)
+	{
+		disable_irq_nosync(host->irq);
+		if(host->second_irq)
+			disable_irq_nosync(host->second_irq);
+		local_irq_enable();
+	}
+#endif
+}
+
+void sdhci_spin_unlock(struct sdhci_host *host)
+{
+#ifdef CONFIG_PREEMPT
+	if(enable_llm)
+	{
+		local_irq_disable();
+		if(host->second_irq)
+			enable_irq(host->second_irq);
+		enable_irq(host->irq);
+	}
+#endif
+	spin_unlock(&host->lock);
+}
+
+void sdhci_spin_lock_irqsave(struct sdhci_host *host,unsigned long *flags)
+{
+#ifdef CONFIG_PREEMPT
+	if(enable_llm)
+	{
+		while(sdhci_locked)
+		{
+			preempt_schedule();
+		}
+		spin_lock_irqsave(&host->lock,*flags);
+		disable_irq(host->irq);
+		if(host->second_irq)
+			disable_irq(host->second_irq);
+		local_irq_enable();
+	}
+	else
+#endif
+		spin_lock_irqsave(&host->lock,*flags);
+}
+
+void sdhci_spin_unlock_irqrestore(struct sdhci_host *host,unsigned long flags)
+{
+#ifdef CONFIG_PREEMPT
+	if(enable_llm)
+	{
+		local_irq_disable();
+		if(host->second_irq)
+			enable_irq(host->second_irq);
+		enable_irq(host->irq);
+	}
+#endif
+	spin_unlock_irqrestore(&host->lock,flags);
+}
+
+static void sdhci_spin_enable_schedule(struct sdhci_host *host)
+{
+#ifdef CONFIG_PREEMPT
+	if(enable_llm)
+	{
+		sdhci_locked = 1;
+		preempt_enable();
+	}
+#endif
+}
+
+static void sdhci_spin_disable_schedule(struct sdhci_host *host)
+{
+#ifdef CONFIG_PREEMPT
+	if(enable_llm)
+	{
+		preempt_disable();
+		sdhci_locked = 0;
+	}
+#endif
+}
 
 static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
 {
@@ -288,7 +374,7 @@ static void sdhci_led_control(struct led
 	struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 	unsigned long flags;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	if (host->runtime_suspended)
 		goto out;
@@ -298,7 +384,7 @@ static void sdhci_led_control(struct led
 	else
 		sdhci_activate_led(host);
 out:
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 #endif
 
@@ -315,7 +401,7 @@ static void sdhci_read_block_pio(struct
 	u32 uninitialized_var(scratch);
 	u8 *buf;
 
-	DBG("PIO reading\n");
+	DBG("PIO reading %db\n", host->data->blksz);
 
 	blksize = host->data->blksz;
 	chunk = 0;
@@ -360,7 +446,7 @@ static void sdhci_write_block_pio(struct
 	u32 scratch;
 	u8 *buf;
 
-	DBG("PIO writing\n");
+	DBG("PIO writing %db\n", host->data->blksz);
 
 	blksize = host->data->blksz;
 	chunk = 0;
@@ -399,19 +485,28 @@ static void sdhci_write_block_pio(struct
 	local_irq_restore(flags);
 }
 
-static void sdhci_transfer_pio(struct sdhci_host *host)
+static void sdhci_transfer_pio(struct sdhci_host *host, u32 intstate)
 {
 	u32 mask;
+	u32 state = 0;
+	u32 intmask;
+	int available;
 
 	BUG_ON(!host->data);
 
 	if (host->blocks == 0)
 		return;
 
-	if (host->data->flags & MMC_DATA_READ)
+	if (host->data->flags & MMC_DATA_READ) {
 		mask = SDHCI_DATA_AVAILABLE;
-	else
+		intmask = SDHCI_INT_DATA_AVAIL;
+	} else {
 		mask = SDHCI_SPACE_AVAILABLE;
+		intmask = SDHCI_INT_SPACE_AVAIL;
+	}
+
+	/* initially we can see whether we can procede using intstate */
+	available = (intstate & intmask);
 
 	/*
 	 * Some controllers (JMicron JMB38x) mess up the buffer bits
@@ -422,7 +517,7 @@ static void sdhci_transfer_pio(struct sd
 		(host->data->blocks == 1))
 		mask = ~0;
 
-	while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
+	while (available) {
 		if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 			udelay(100);
 
@@ -434,9 +529,11 @@ static void sdhci_transfer_pio(struct sd
 		host->blocks--;
 		if (host->blocks == 0)
 			break;
+		state = sdhci_readl(host, SDHCI_PRESENT_STATE);
+		available = state & mask;
 	}
 
-	DBG("PIO transfer complete.\n");
+	DBG("PIO transfer complete - %d blocks left.\n", host->blocks);
 }
 
 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
@@ -709,7 +806,9 @@ static void sdhci_set_transfer_irqs(stru
 	u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 	u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 
-	if (host->flags & SDHCI_REQ_USE_DMA)
+	/* platform DMA will begin on receipt of PIO irqs */
+	if ((host->flags & SDHCI_REQ_USE_DMA) &&
+	    !(host->flags & SDHCI_USE_PLATDMA))
 		sdhci_clear_set_irqs(host, pio_irqs, dma_irqs);
 	else
 		sdhci_clear_set_irqs(host, dma_irqs, pio_irqs);
@@ -741,44 +840,25 @@ static void sdhci_prepare_data(struct sd
 	host->data_early = 0;
 	host->data->bytes_xfered = 0;
 
-	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA | SDHCI_USE_PLATDMA))
 		host->flags |= SDHCI_REQ_USE_DMA;
 
 	/*
 	 * FIXME: This doesn't account for merging when mapping the
 	 * scatterlist.
 	 */
-	if (host->flags & SDHCI_REQ_USE_DMA) {
-		int broken, i;
-		struct scatterlist *sg;
-
-		broken = 0;
-		if (host->flags & SDHCI_USE_ADMA) {
-			if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
-				broken = 1;
-		} else {
-			if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
-				broken = 1;
-		}
-
-		if (unlikely(broken)) {
-			for_each_sg(data->sg, sg, data->sg_len, i) {
-				if (sg->length & 0x3) {
-					DBG("Reverting to PIO because of "
-						"transfer size (%d)\n",
-						sg->length);
-					host->flags &= ~SDHCI_REQ_USE_DMA;
-					break;
-				}
-			}
-		}
-	}
 
 	/*
 	 * The assumption here being that alignment is the same after
 	 * translation to device address space.
 	 */
-	if (host->flags & SDHCI_REQ_USE_DMA) {
+	if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_PLATDMA)) ==
+	    (SDHCI_REQ_USE_DMA | SDHCI_USE_PLATDMA)) {
+		
+		if (! sdhci_platdma_dmaable(host, data))
+			host->flags &= ~SDHCI_REQ_USE_DMA;
+
+	} else if (host->flags & SDHCI_REQ_USE_DMA) {
 		int broken, i;
 		struct scatterlist *sg;
 
@@ -837,7 +917,8 @@ static void sdhci_prepare_data(struct sd
 				 */
 				WARN_ON(1);
 				host->flags &= ~SDHCI_REQ_USE_DMA;
-			} else {
+			} else 
+			if (!(host->flags & SDHCI_USE_PLATDMA)) {
 				WARN_ON(sg_cnt != 1);
 				sdhci_writel(host, sg_dma_address(data->sg),
 					SDHCI_DMA_ADDRESS);
@@ -853,11 +934,13 @@ static void sdhci_prepare_data(struct sd
 	if (host->version >= SDHCI_SPEC_200) {
 		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 		ctrl &= ~SDHCI_CTRL_DMA_MASK;
+		if (! (host->flags & SDHCI_USE_PLATDMA)) {
 		if ((host->flags & SDHCI_REQ_USE_DMA) &&
 			(host->flags & SDHCI_USE_ADMA))
 			ctrl |= SDHCI_CTRL_ADMA32;
 		else
 			ctrl |= SDHCI_CTRL_SDMA;
+		}
 		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 	}
 
@@ -909,7 +992,8 @@ static void sdhci_set_transfer_mode(stru
 
 	if (data->flags & MMC_DATA_READ)
 		mode |= SDHCI_TRNS_READ;
-	if (host->flags & SDHCI_REQ_USE_DMA)
+	if ((host->flags & SDHCI_REQ_USE_DMA) &&
+	    !(host->flags & SDHCI_USE_PLATDMA))
 		mode |= SDHCI_TRNS_DMA;
 
 	sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
@@ -925,13 +1009,16 @@ static void sdhci_finish_data(struct sdh
 	host->data = NULL;
 
 	if (host->flags & SDHCI_REQ_USE_DMA) {
-		if (host->flags & SDHCI_USE_ADMA)
-			sdhci_adma_table_post(host, data);
-		else {
+		/* we may have to abandon an ongoing platform DMA */
+		if (host->flags & SDHCI_USE_PLATDMA)
+			sdhci_platdma_reset(host, data);
+
+		if (host->flags & (SDHCI_USE_PLATDMA | SDHCI_USE_SDMA)) {
 			dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 				data->sg_len, (data->flags & MMC_DATA_READ) ?
 					DMA_FROM_DEVICE : DMA_TO_DEVICE);
-		}
+		} else if (host->flags & SDHCI_USE_ADMA)
+                        sdhci_adma_table_post(host, data);
 	}
 
 	/*
@@ -984,6 +1071,12 @@ static void sdhci_send_command(struct sd
 	if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 		mask |= SDHCI_DATA_INHIBIT;
 
+	if(host->ops->missing_status && (cmd->opcode == MMC_SEND_STATUS)) {
+		timeout = 5000; // Really obscenely large delay to send the status, due to bug in controller
+				// which might cause the STATUS command to get stuck when a data operation is in flow
+		mask |= SDHCI_DATA_INHIBIT;
+	}
+
 	/* We shouldn't wait for data inihibit for stop commands, even
 	   though they might use busy signaling */
 	if (host->mrq->data && (cmd == host->mrq->data->stop))
@@ -999,12 +1092,20 @@ static void sdhci_send_command(struct sd
 			return;
 		}
 		timeout--;
+		sdhci_spin_enable_schedule(host);
 		mdelay(1);
+		sdhci_spin_disable_schedule(host);
 	}
+	DBG("send cmd %d - wait 0x%X irq 0x%x\n", cmd->opcode, mask,
+	    sdhci_readl(host, SDHCI_INT_STATUS));
 
 	mod_timer(&host->timer, jiffies + 10 * HZ);
 
 	host->cmd = cmd;
+	if (host->last_cmdop == MMC_APP_CMD)
+		host->last_cmdop = -cmd->opcode;
+	else
+		host->last_cmdop = cmd->opcode;
 
 	sdhci_prepare_data(host, cmd);
 
@@ -1220,7 +1321,9 @@ clock_set:
 			return;
 		}
 		timeout--;
+		sdhci_spin_enable_schedule(host);
 		mdelay(1);
+		sdhci_spin_disable_schedule(host);
 	}
 
 	clk |= SDHCI_CLOCK_CARD_EN;
@@ -1316,7 +1419,7 @@ static void sdhci_request(struct mmc_hos
 
 	sdhci_runtime_pm_get(host);
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	WARN_ON(host->mrq != NULL);
 
@@ -1374,9 +1477,9 @@ static void sdhci_request(struct mmc_hos
 					mmc->card->type == MMC_TYPE_MMC ?
 					MMC_SEND_TUNING_BLOCK_HS200 :
 					MMC_SEND_TUNING_BLOCK;
-				spin_unlock_irqrestore(&host->lock, flags);
+				sdhci_spin_unlock_irqrestore(host, flags);
 				sdhci_execute_tuning(mmc, tuning_opcode);
-				spin_lock_irqsave(&host->lock, flags);
+				sdhci_spin_lock_irqsave(host, &flags);
 
 				/* Restore original mmc_request structure */
 				host->mrq = mrq;
@@ -1390,7 +1493,7 @@ static void sdhci_request(struct mmc_hos
 	}
 
 	mmiowb();
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 
 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
@@ -1399,10 +1502,10 @@ static void sdhci_do_set_ios(struct sdhc
 	int vdd_bit = -1;
 	u8 ctrl;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	if (host->flags & SDHCI_DEVICE_DEAD) {
-		spin_unlock_irqrestore(&host->lock, flags);
+		sdhci_spin_unlock_irqrestore(host, flags);
 		if (host->vmmc && ios->power_mode == MMC_POWER_OFF)
 			mmc_regulator_set_ocr(host->mmc, host->vmmc, 0);
 		return;
@@ -1429,9 +1532,9 @@ static void sdhci_do_set_ios(struct sdhc
 		vdd_bit = sdhci_set_power(host, ios->vdd);
 
 	if (host->vmmc && vdd_bit != -1) {
-		spin_unlock_irqrestore(&host->lock, flags);
+		sdhci_spin_unlock_irqrestore(host, flags);
 		mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd_bit);
-		spin_lock_irqsave(&host->lock, flags);
+		sdhci_spin_lock_irqsave(host, &flags);
 	}
 
 	if (host->ops->platform_send_init_74_clocks)
@@ -1470,7 +1573,7 @@ static void sdhci_do_set_ios(struct sdhc
 	else
 		ctrl &= ~SDHCI_CTRL_HISPD;
 
-	if (host->version >= SDHCI_SPEC_300) {
+	if (host->version >= SDHCI_SPEC_300 && !(host->ops->uhs_broken)) {
 		u16 clk, ctrl_2;
 
 		/* In case of UHS-I modes, set High Speed Enable */
@@ -1569,7 +1672,7 @@ static void sdhci_do_set_ios(struct sdhc
 		sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
 
 	mmiowb();
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 
 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
@@ -1617,7 +1720,7 @@ static int sdhci_check_ro(struct sdhci_h
 	unsigned long flags;
 	int is_readonly;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	if (host->flags & SDHCI_DEVICE_DEAD)
 		is_readonly = 0;
@@ -1627,7 +1730,7 @@ static int sdhci_check_ro(struct sdhci_h
 		is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
 				& SDHCI_WRITE_PROTECT);
 
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 
 	/* This quirk needs to be replaced by a callback-function later */
 	return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
@@ -1700,9 +1803,9 @@ static void sdhci_enable_sdio_irq(struct
 	struct sdhci_host *host = mmc_priv(mmc);
 	unsigned long flags;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 	sdhci_enable_sdio_irq_nolock(host, enable);
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 
 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
@@ -2046,7 +2149,7 @@ static void sdhci_card_event(struct mmc_
 	struct sdhci_host *host = mmc_priv(mmc);
 	unsigned long flags;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	/* Check host->mrq first in case we are runtime suspended */
 	if (host->mrq &&
@@ -2063,7 +2166,7 @@ static void sdhci_card_event(struct mmc_
 		tasklet_schedule(&host->finish_tasklet);
 	}
 
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 
 static const struct mmc_host_ops sdhci_ops = {
@@ -2102,14 +2205,14 @@ static void sdhci_tasklet_finish(unsigne
 
 	host = (struct sdhci_host*)param;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
         /*
          * If this tasklet gets rescheduled while running, it will
          * be run again afterwards but without any active request.
          */
 	if (!host->mrq) {
-		spin_unlock_irqrestore(&host->lock, flags);
+		sdhci_spin_unlock_irqrestore(host, flags);
 		return;
 	}
 
@@ -2147,7 +2250,7 @@ static void sdhci_tasklet_finish(unsigne
 #endif
 
 	mmiowb();
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 
 	mmc_request_done(host->mmc, mrq);
 	sdhci_runtime_pm_put(host);
@@ -2160,11 +2263,11 @@ static void sdhci_timeout_timer(unsigned
 
 	host = (struct sdhci_host*)data;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	if (host->mrq) {
 		pr_err("%s: Timeout waiting for hardware "
-			"interrupt.\n", mmc_hostname(host->mmc));
+			"interrupt - cmd%d.\n", mmc_hostname(host->mmc), host->last_cmdop);
 		sdhci_dumpregs(host);
 
 		if (host->data) {
@@ -2181,7 +2284,7 @@ static void sdhci_timeout_timer(unsigned
 	}
 
 	mmiowb();
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 
 static void sdhci_tuning_timer(unsigned long data)
@@ -2191,11 +2294,11 @@ static void sdhci_tuning_timer(unsigned
 
 	host = (struct sdhci_host *)data;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	host->flags |= SDHCI_NEEDS_RETUNING;
 
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 }
 
 /*****************************************************************************\
@@ -2209,10 +2312,13 @@ static void sdhci_cmd_irq(struct sdhci_h
 	BUG_ON(intmask == 0);
 
 	if (!host->cmd) {
+		if (!(host->ops->extra_ints)) {
 		pr_err("%s: Got command interrupt 0x%08x even "
 			"though no command operation was in progress.\n",
 			mmc_hostname(host->mmc), (unsigned)intmask);
 		sdhci_dumpregs(host);
+		} else
+			DBG("cmd irq 0x%08x cmd complete\n", (unsigned)intmask);
 		return;
 	}
 
@@ -2282,6 +2388,19 @@ static void sdhci_show_adma_error(struct
 static void sdhci_show_adma_error(struct sdhci_host *host) { }
 #endif
 
+static void sdhci_data_end(struct sdhci_host *host)
+{
+	if (host->cmd) {
+		/*
+		 * Data managed to finish before the
+		 * command completed. Make sure we do
+		 * things in the proper order.
+		 */
+		host->data_early = 1;
+	} else 
+		sdhci_finish_data(host);
+}
+
 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 {
 	u32 command;
@@ -2311,23 +2430,39 @@ static void sdhci_data_irq(struct sdhci_
 			}
 		}
 
+		if (!(host->ops->extra_ints)) {
 		pr_err("%s: Got data interrupt 0x%08x even "
 			"though no data operation was in progress.\n",
 			mmc_hostname(host->mmc), (unsigned)intmask);
 		sdhci_dumpregs(host);
+		} else
+			DBG("data irq 0x%08x but no data\n", (unsigned)intmask);
 
 		return;
 	}
 
 	if (intmask & SDHCI_INT_DATA_TIMEOUT)
 		host->data->error = -ETIMEDOUT;
-	else if (intmask & SDHCI_INT_DATA_END_BIT)
+	else if (intmask & SDHCI_INT_DATA_END_BIT) {
+		DBG("end error in cmd %d\n", host->last_cmdop);
+		if (host->ops->spurious_crc_acmd51 &&
+		    host->last_cmdop == -SD_APP_SEND_SCR) {
+			DBG("ignoring spurious data_end_bit error\n");
+			intmask = SDHCI_INT_DATA_AVAIL|SDHCI_INT_DATA_END;
+		} else
 		host->data->error = -EILSEQ;
-	else if ((intmask & SDHCI_INT_DATA_CRC) &&
+	} else if ((intmask & SDHCI_INT_DATA_CRC) &&
 		SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
-			!= MMC_BUS_TEST_R)
+			!= MMC_BUS_TEST_R) {
+		DBG("crc error in cmd %d\n", host->last_cmdop);
+		if (host->ops->spurious_crc_acmd51 &&
+				host->last_cmdop == -SD_APP_SEND_SCR) {
+			DBG("ignoring spurious data_crc_bit error\n");
+			intmask = SDHCI_INT_DATA_AVAIL|SDHCI_INT_DATA_END;
+		} else {
 		host->data->error = -EILSEQ;
-	else if (intmask & SDHCI_INT_ADMA_ERROR) {
+		}
+	} else if (intmask & SDHCI_INT_ADMA_ERROR) {
 		pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
 		sdhci_show_adma_error(host);
 		host->data->error = -EIO;
@@ -2335,11 +2470,18 @@ static void sdhci_data_irq(struct sdhci_
 			host->ops->adma_workaround(host, intmask);
 	}
 
-	if (host->data->error)
+	if (host->data->error) {
+		DBG("finish request early on error %d\n", host->data->error);
 		sdhci_finish_data(host);
-	else {
-		if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
-			sdhci_transfer_pio(host);
+	} else {
+		if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)) {
+			if (host->flags & SDHCI_REQ_USE_DMA) {
+				/* possible only in PLATDMA mode */
+				sdhci_platdma_avail(host, &intmask,
+						&sdhci_data_end);
+			} else
+				sdhci_transfer_pio(host, intmask);
+		}
 
 		/*
 		 * We currently don't do anything fancy with DMA
@@ -2368,18 +2510,8 @@ static void sdhci_data_irq(struct sdhci_
 			sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
 		}
 
-		if (intmask & SDHCI_INT_DATA_END) {
-			if (host->cmd) {
-				/*
-				 * Data managed to finish before the
-				 * command completed. Make sure we do
-				 * things in the proper order.
-				 */
-				host->data_early = 1;
-			} else {
-				sdhci_finish_data(host);
-			}
-		}
+		if (intmask & SDHCI_INT_DATA_END)
+			sdhci_data_end(host);
 	}
 }
 
@@ -2390,10 +2522,10 @@ static irqreturn_t sdhci_irq(int irq, vo
 	u32 intmask, unexpected = 0;
 	int cardint = 0, max_loops = 16;
 
-	spin_lock(&host->lock);
+	sdhci_spin_lock(host);
 
 	if (host->runtime_suspended) {
-		spin_unlock(&host->lock);
+		sdhci_spin_unlock(host);
 		pr_warning("%s: got irq while runtime suspended\n",
 		       mmc_hostname(host->mmc));
 		return IRQ_HANDLED;
@@ -2435,6 +2567,22 @@ again:
 		tasklet_schedule(&host->card_tasklet);
 	}
 
+	if (intmask & SDHCI_INT_ERROR_MASK & ~SDHCI_INT_ERROR)
+		DBG("controller reports error 0x%x -"
+				"%s%s%s%s%s%s%s%s%s%s",
+				intmask,
+				intmask & SDHCI_INT_TIMEOUT? " timeout": "",
+				intmask & SDHCI_INT_CRC     ? " crc": "",
+				intmask & SDHCI_INT_END_BIT? " endbit": "",
+				intmask & SDHCI_INT_INDEX? " index": "",
+				intmask & SDHCI_INT_DATA_TIMEOUT? " data_timeout": "",
+				intmask & SDHCI_INT_DATA_CRC? " data_crc": "",
+				intmask & SDHCI_INT_DATA_END_BIT? " data_endbit": "",
+				intmask & SDHCI_INT_BUS_POWER? " buspower": "",
+				intmask & SDHCI_INT_ACMD12ERR? " acmd12": "",
+				intmask & SDHCI_INT_ADMA_ERROR? " adma": ""
+		   );
+
 	if (intmask & SDHCI_INT_CMD_MASK) {
 		sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK,
 			SDHCI_INT_STATUS);
@@ -2449,7 +2597,13 @@ again:
 
 	intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
 
-	intmask &= ~SDHCI_INT_ERROR;
+	if (intmask & SDHCI_INT_ERROR_MASK) {
+		/* collect any uncovered errors */
+		sdhci_writel(host, intmask & SDHCI_INT_ERROR_MASK,
+				SDHCI_INT_STATUS);
+	}
+
+	intmask &= ~SDHCI_INT_ERROR_MASK;
 
 	if (intmask & SDHCI_INT_BUS_POWER) {
 		pr_err("%s: Card is consuming too much power!\n",
@@ -2475,7 +2629,7 @@ again:
 	if (intmask && --max_loops)
 		goto again;
 out:
-	spin_unlock(&host->lock);
+	sdhci_spin_unlock(host);
 
 	if (unexpected) {
 		pr_err("%s: Unexpected interrupt 0x%08x.\n",
@@ -2569,7 +2723,8 @@ int sdhci_resume_host(struct sdhci_host
 {
 	int ret;
 
-	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA | 
+			   SDHCI_USE_PLATDMA)) {
 		if (host->ops->enable_dma)
 			host->ops->enable_dma(host);
 	}
@@ -2636,15 +2791,15 @@ int sdhci_runtime_suspend_host(struct sd
 		host->flags &= ~SDHCI_NEEDS_RETUNING;
 	}
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 	sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 
 	synchronize_irq(host->irq);
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 	host->runtime_suspended = true;
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 
 	return ret;
 }
@@ -2670,16 +2825,16 @@ int sdhci_runtime_resume_host(struct sdh
 	sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
 	if ((host_flags & SDHCI_PV_ENABLED) &&
 		!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
-		spin_lock_irqsave(&host->lock, flags);
+		sdhci_spin_lock_irqsave(host, &flags);
 		sdhci_enable_preset_value(host, true);
-		spin_unlock_irqrestore(&host->lock, flags);
+		sdhci_spin_unlock_irqrestore(host, flags);
 	}
 
 	/* Set the re-tuning expiration flag */
 	if (host->flags & SDHCI_USING_RETUNING_TIMER)
 		host->flags |= SDHCI_NEEDS_RETUNING;
 
-	spin_lock_irqsave(&host->lock, flags);
+	sdhci_spin_lock_irqsave(host, &flags);
 
 	host->runtime_suspended = false;
 
@@ -2690,7 +2845,7 @@ int sdhci_runtime_resume_host(struct sdh
 	/* Enable Card Detection */
 	sdhci_enable_card_detection(host);
 
-	spin_unlock_irqrestore(&host->lock, flags);
+	sdhci_spin_unlock_irqrestore(host, flags);
 
 	return ret;
 }
@@ -2785,14 +2940,16 @@ int sdhci_add_host(struct sdhci_host *ho
 		host->flags &= ~SDHCI_USE_ADMA;
 	}
 
-	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA | 
+			   SDHCI_USE_PLATDMA)) {
 		if (host->ops->enable_dma) {
 			if (host->ops->enable_dma(host)) {
 				pr_warning("%s: No suitable DMA "
 					"available. Falling back to PIO.\n",
 					mmc_hostname(mmc));
 				host->flags &=
-					~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
+					~(SDHCI_USE_SDMA | SDHCI_USE_ADMA |
+					  SDHCI_USE_PLATDMA);
 			}
 		}
 	}
@@ -3080,6 +3237,12 @@ int sdhci_add_host(struct sdhci_host *ho
 				   SDHCI_MAX_CURRENT_MULTIPLIER;
 	}
 
+	if(host->ops->voltage_broken) {
+		ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
+		// Cannot support UHS modes if we are stuck at 3.3V;
+		mmc->caps &= ~(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_DDR50);
+	}
+
 	mmc->ocr_avail = ocr_avail;
 	mmc->ocr_avail_sdio = ocr_avail;
 	if (host->ocr_avail_sdio)
@@ -3174,7 +3337,7 @@ int sdhci_add_host(struct sdhci_host *ho
 		host->tuning_timer.function = sdhci_tuning_timer;
 	}
 
-	ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
+	ret = request_irq(host->irq, sdhci_irq, 0,//IRQF_SHARED,
 		mmc_hostname(mmc), host);
 	if (ret) {
 		pr_err("%s: Failed to request IRQ %d: %d\n",
@@ -3210,6 +3373,7 @@ int sdhci_add_host(struct sdhci_host *ho
 
 	pr_info("%s: SDHCI controller on %s [%s] using %s\n",
 		mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
+		(host->flags & SDHCI_USE_PLATDMA) ? "platform's DMA" :
 		(host->flags & SDHCI_USE_ADMA) ? "ADMA" :
 		(host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
 
@@ -3237,7 +3401,7 @@ void sdhci_remove_host(struct sdhci_host
 	unsigned long flags;
 
 	if (dead) {
-		spin_lock_irqsave(&host->lock, flags);
+		sdhci_spin_lock_irqsave(host, &flags);
 
 		host->flags |= SDHCI_DEVICE_DEAD;
 
@@ -3249,7 +3413,7 @@ void sdhci_remove_host(struct sdhci_host
 			tasklet_schedule(&host->finish_tasklet);
 		}
 
-		spin_unlock_irqrestore(&host->lock, flags);
+		sdhci_spin_unlock_irqrestore(host, flags);
 	}
 
 	sdhci_disable_card_detection(host);
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -289,6 +289,20 @@ struct sdhci_ops {
 	void	(*platform_reset_enter)(struct sdhci_host *host, u8 mask);
 	void	(*platform_reset_exit)(struct sdhci_host *host, u8 mask);
 	int	(*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);
+
+	int             (*pdma_able)(struct sdhci_host *host,
+				     struct mmc_data *data);
+	void            (*pdma_avail)(struct sdhci_host *host,
+				      unsigned int *ref_intmask,
+				      void(*complete)(struct sdhci_host *));
+	void            (*pdma_reset)(struct sdhci_host *host,
+				      struct mmc_data *data);
+	unsigned int 	(*extra_ints)(struct sdhci_host *host);
+	unsigned int	(*spurious_crc_acmd51)(struct sdhci_host *host);
+	unsigned int	(*voltage_broken)(struct sdhci_host *host);
+	unsigned int	(*uhs_broken)(struct sdhci_host *host);
+	unsigned int	(*missing_status)(struct sdhci_host *host);
+
 	void	(*hw_reset)(struct sdhci_host *host);
 	void	(*platform_suspend)(struct sdhci_host *host);
 	void	(*platform_resume)(struct sdhci_host *host);
@@ -399,9 +413,38 @@ extern int sdhci_resume_host(struct sdhc
 extern void sdhci_enable_irq_wakeups(struct sdhci_host *host);
 #endif
 
+static inline int /*bool*/
+sdhci_platdma_dmaable(struct sdhci_host *host, struct mmc_data *data)
+{
+	if (host->ops->pdma_able)
+		return host->ops->pdma_able(host, data);
+	else
+		return 1;
+}
+static inline void
+sdhci_platdma_avail(struct sdhci_host *host, unsigned int *ref_intmask,
+		void(*completion_callback)(struct sdhci_host *))
+{
+	if (host->ops->pdma_avail)
+		host->ops->pdma_avail(host, ref_intmask, completion_callback);
+}
+
+static inline void
+sdhci_platdma_reset(struct sdhci_host *host, struct mmc_data *data)
+{
+	if (host->ops->pdma_reset)
+		host->ops->pdma_reset(host, data);
+}
+   
 #ifdef CONFIG_PM_RUNTIME
 extern int sdhci_runtime_suspend_host(struct sdhci_host *host);
 extern int sdhci_runtime_resume_host(struct sdhci_host *host);
 #endif
 
+extern void sdhci_spin_lock_irqsave(struct sdhci_host *host,unsigned long *flags);
+extern void sdhci_spin_unlock_irqrestore(struct sdhci_host *host,unsigned long flags);
+extern void sdhci_spin_lock(struct sdhci_host *host);
+extern void sdhci_spin_unlock(struct sdhci_host *host);
+
+
 #endif /* __SDHCI_HW_H */
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -281,6 +281,7 @@ struct mmc_host {
 #define MMC_CAP2_PACKED_CMD	(MMC_CAP2_PACKED_RD | \
 				 MMC_CAP2_PACKED_WR)
 #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14)	/* Don't power up before scan */
+#define MMC_CAP2_FORCE_MULTIBLOCK (1 << 31)	/* Always use multiblock transfers */
 
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -97,6 +97,7 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_PRESET_VALUE_BROKEN		(1<<3)
 
 	int irq;		/* Device IRQ */
+	int second_irq; 	/* Additional IRQ to disable/enable in low-latency mode */
 	void __iomem *ioaddr;	/* Mapped address */
 
 	const struct sdhci_ops *ops;	/* Low level hw interface */
@@ -128,6 +129,7 @@ struct sdhci_host {
 #define SDHCI_SDIO_IRQ_ENABLED	(1<<9)	/* SDIO irq enabled */
 #define SDHCI_HS200_NEEDS_TUNING (1<<10)	/* HS200 needs tuning */
 #define SDHCI_USING_RETUNING_TIMER (1<<11)	/* Host is using a retuning timer for the card */
+#define SDHCI_USE_PLATDMA       (1<<12) /* Host uses 3rd party DMA */
 
 	unsigned int version;	/* SDHCI spec. version */
 
@@ -142,6 +144,7 @@ struct sdhci_host {
 
 	struct mmc_request *mrq;	/* Current request */
 	struct mmc_command *cmd;	/* Current command */
+	int	last_cmdop;	/* Opcode of last cmd sent */
 	struct mmc_data *data;	/* Current data request */
 	unsigned int data_early:1;	/* Data finished before cmd */