22 files changed, 906 insertions, 254 deletions

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index f60b2b6a093..d31590e7011 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -122,6 +122,31 @@ static int __init amba_init(void)
 
 postcore_initcall(amba_init);
 
+static int amba_get_enable_pclk(struct amba_device *pcdev)
+{
+	struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
+	int ret;
+
+	pcdev->pclk = pclk;
+
+	if (IS_ERR(pclk))
+		return PTR_ERR(pclk);
+
+	ret = clk_enable(pclk);
+	if (ret)
+		clk_put(pclk);
+
+	return ret;
+}
+
+static void amba_put_disable_pclk(struct amba_device *pcdev)
+{
+	struct clk *pclk = pcdev->pclk;
+
+	clk_disable(pclk);
+	clk_put(pclk);
+}
+
 /*
  * These are the device model conversion veneers; they convert the
  * device model structures to our more specific structures.
@@ -130,17 +155,33 @@ static int amba_probe(struct device *dev)
 {
 	struct amba_device *pcdev = to_amba_device(dev);
 	struct amba_driver *pcdrv = to_amba_driver(dev->driver);
-	struct amba_id *id;
+	struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
+	int ret;
 
-	id = amba_lookup(pcdrv->id_table, pcdev);
+	do {
+		ret = amba_get_enable_pclk(pcdev);
+		if (ret)
+			break;
+
+		ret = pcdrv->probe(pcdev, id);
+		if (ret == 0)
+			break;
 
-	return pcdrv->probe(pcdev, id);
+		amba_put_disable_pclk(pcdev);
+	} while (0);
+
+	return ret;
 }
 
 static int amba_remove(struct device *dev)
 {
+	struct amba_device *pcdev = to_amba_device(dev);
 	struct amba_driver *drv = to_amba_driver(dev->driver);
-	return drv->remove(to_amba_device(dev));
+	int ret = drv->remove(pcdev);
+
+	amba_put_disable_pclk(pcdev);
+
+	return ret;
 }
 
 static void amba_shutdown(struct device *dev)
@@ -203,7 +244,6 @@ static void amba_device_release(struct device *dev)
  */
 int amba_device_register(struct amba_device *dev, struct resource *parent)
 {
-	u32 pid, cid;
 	u32 size;
 	void __iomem *tmp;
 	int i, ret;
@@ -241,25 +281,35 @@ int amba_device_register(struct amba_device *dev, struct resource *parent)
 		goto err_release;
 	}
 
-	/*
-	 * Read pid and cid based on size of resource
-	 * they are located at end of region
-	 */
-	for (pid = 0, i = 0; i < 4; i++)
-		pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << (i * 8);
-	for (cid = 0, i = 0; i < 4; i++)
-		cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << (i * 8);
+	ret = amba_get_enable_pclk(dev);
+	if (ret == 0) {
+		u32 pid, cid;
 
-	iounmap(tmp);
+		/*
+		 * Read pid and cid based on size of resource
+		 * they are located at end of region
+		 */
+		for (pid = 0, i = 0; i < 4; i++)
+			pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
+				(i * 8);
+		for (cid = 0, i = 0; i < 4; i++)
+			cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
+				(i * 8);
 
-	if (cid == 0xb105f00d)
-		dev->periphid = pid;
+		amba_put_disable_pclk(dev);
 
-	if (!dev->periphid) {
-		ret = -ENODEV;
-		goto err_release;
+		if (cid == 0xb105f00d)
+			dev->periphid = pid;
+
+		if (!dev->periphid)
+			ret = -ENODEV;
 	}
 
+	iounmap(tmp);
+
+	if (ret)
+		goto err_release;
+
 	ret = device_add(&dev->dev);
 	if (ret)
 		goto err_release;
diff --git a/drivers/gpio/pl061.c b/drivers/gpio/pl061.c
index ee568c8fcbd..5005990f751 100644
--- a/drivers/gpio/pl061.c
+++ b/drivers/gpio/pl061.c
@@ -232,7 +232,7 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
 	desc->chip->unmask(irq);
 }
 
-static int __init pl061_probe(struct amba_device *dev, struct amba_id *id)
+static int pl061_probe(struct amba_device *dev, struct amba_id *id)
 {
 	struct pl061_platform_data *pdata;
 	struct pl061_gpio *chip;
@@ -333,7 +333,7 @@ free_mem:
 	return ret;
 }
 
-static struct amba_id pl061_ids[] __initdata = {
+static struct amba_id pl061_ids[] = {
 	{
 		.id	= 0x00041061,
 		.mask	= 0x000fffff,
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 26386a92f5a..9b089dfb173 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -353,6 +353,16 @@ config VMWARE_BALLOON
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmware_balloon.
 
+config ARM_CHARLCD
+	bool "ARM Ltd. Character LCD Driver"
+	depends on PLAT_VERSATILE
+	help
+	  This is a driver for the character LCD found on the ARM Ltd.
+	  Versatile and RealView Platform Baseboards. It doesn't do
+	  very much more than display the text "ARM Linux" on the first
+	  line and the Linux version on the second line, but that's
+	  still useful.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 6ed06a19474..67552d6e932 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_IWMC3200TOP)      += iwmc3200top/
 obj-y				+= eeprom/
 obj-y				+= cb710/
 obj-$(CONFIG_VMWARE_BALLOON)	+= vmware_balloon.o
+obj-$(CONFIG_ARM_CHARLCD)	+= arm-charlcd.o
diff --git a/drivers/misc/arm-charlcd.c b/drivers/misc/arm-charlcd.c
new file mode 100644
index 00000000000..9e3879ef58f
--- /dev/null
+++ b/drivers/misc/arm-charlcd.c
@@ -0,0 +1,396 @@
+/*
+ * Driver for the on-board character LCD found on some ARM reference boards
+ * This is basically an Hitachi HD44780 LCD with a custom IP block to drive it
+ * http://en.wikipedia.org/wiki/HD44780_Character_LCD
+ * Currently it will just display the text "ARM Linux" and the linux version
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ * Author: Linus Walleij <triad@df.lth.se>
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <generated/utsrelease.h>
+
+#define DRIVERNAME "arm-charlcd"
+#define CHARLCD_TIMEOUT (msecs_to_jiffies(1000))
+
+/* Offsets to registers */
+#define CHAR_COM	0x00U
+#define CHAR_DAT	0x04U
+#define CHAR_RD		0x08U
+#define CHAR_RAW	0x0CU
+#define CHAR_MASK	0x10U
+#define CHAR_STAT	0x14U
+
+#define CHAR_RAW_CLEAR	0x00000000U
+#define CHAR_RAW_VALID	0x00000100U
+
+/* Hitachi HD44780 display commands */
+#define HD_CLEAR			0x01U
+#define HD_HOME				0x02U
+#define HD_ENTRYMODE			0x04U
+#define HD_ENTRYMODE_INCREMENT		0x02U
+#define HD_ENTRYMODE_SHIFT		0x01U
+#define HD_DISPCTRL			0x08U
+#define HD_DISPCTRL_ON			0x04U
+#define HD_DISPCTRL_CURSOR_ON		0x02U
+#define HD_DISPCTRL_CURSOR_BLINK	0x01U
+#define HD_CRSR_SHIFT			0x10U
+#define HD_CRSR_SHIFT_DISPLAY		0x08U
+#define HD_CRSR_SHIFT_DISPLAY_RIGHT	0x04U
+#define HD_FUNCSET			0x20U
+#define HD_FUNCSET_8BIT			0x10U
+#define HD_FUNCSET_2_LINES		0x08U
+#define HD_FUNCSET_FONT_5X10		0x04U
+#define HD_SET_CGRAM			0x40U
+#define HD_SET_DDRAM			0x80U
+#define HD_BUSY_FLAG			0x80U
+
+/**
+ * @dev: a pointer back to containing device
+ * @phybase: the offset to the controller in physical memory
+ * @physize: the size of the physical page
+ * @virtbase: the offset to the controller in virtual memory
+ * @irq: reserved interrupt number
+ * @complete: completion structure for the last LCD command
+ */
+struct charlcd {
+	struct device *dev;
+	u32 phybase;
+	u32 physize;
+	void __iomem *virtbase;
+	int irq;
+	struct completion complete;
+	struct delayed_work init_work;
+};
+
+static irqreturn_t charlcd_interrupt(int irq, void *data)
+{
+	struct charlcd *lcd = data;
+	u8 status;
+
+	status = readl(lcd->virtbase + CHAR_STAT) & 0x01;
+	/* Clear IRQ */
+	writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+	if (status)
+		complete(&lcd->complete);
+	else
+		dev_info(lcd->dev, "Spurious IRQ (%02x)\n", status);
+	return IRQ_HANDLED;
+}
+
+
+static void charlcd_wait_complete_irq(struct charlcd *lcd)
+{
+	int ret;
+
+	ret = wait_for_completion_interruptible_timeout(&lcd->complete,
+							CHARLCD_TIMEOUT);
+	/* Disable IRQ after completion */
+	writel(0x00, lcd->virtbase + CHAR_MASK);
+
+	if (ret < 0) {
+		dev_err(lcd->dev,
+			"wait_for_completion_interruptible_timeout() "
+			"returned %d waiting for ready\n", ret);
+		return;
+	}
+
+	if (ret == 0) {
+		dev_err(lcd->dev, "charlcd controller timed out "
+			"waiting for ready\n");
+		return;
+	}
+}
+
+static u8 charlcd_4bit_read_char(struct charlcd *lcd)
+{
+	u8 data;
+	u32 val;
+	int i;
+
+	/* If we can, use an IRQ to wait for the data, else poll */
+	if (lcd->irq >= 0)
+		charlcd_wait_complete_irq(lcd);
+	else {
+		i = 0;
+		val = 0;
+		while (!(val & CHAR_RAW_VALID) && i < 10) {
+			udelay(100);
+			val = readl(lcd->virtbase + CHAR_RAW);
+			i++;
+		}
+
+		writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+	}
+	msleep(1);
+
+	/* Read the 4 high bits of the data */
+	data = readl(lcd->virtbase + CHAR_RD) & 0xf0;
+
+	/*
+	 * The second read for the low bits does not trigger an IRQ
+	 * so in this case we have to poll for the 4 lower bits
+	 */
+	i = 0;
+	val = 0;
+	while (!(val & CHAR_RAW_VALID) && i < 10) {
+		udelay(100);
+		val = readl(lcd->virtbase + CHAR_RAW);
+		i++;
+	}
+	writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+	msleep(1);
+
+	/* Read the 4 low bits of the data */
+	data |= (readl(lcd->virtbase + CHAR_RD) >> 4) & 0x0f;
+
+	return data;
+}
+
+static bool charlcd_4bit_read_bf(struct charlcd *lcd)
+{
+	if (lcd->irq >= 0) {
+		/*
+		 * If we'll use IRQs to wait for the busyflag, clear any
+		 * pending flag and enable IRQ
+		 */
+		writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW);
+		init_completion(&lcd->complete);
+		writel(0x01, lcd->virtbase + CHAR_MASK);
+	}
+	readl(lcd->virtbase + CHAR_COM);
+	return charlcd_4bit_read_char(lcd) & HD_BUSY_FLAG ? true : false;
+}
+
+static void charlcd_4bit_wait_busy(struct charlcd *lcd)
+{
+	int retries = 50;
+
+	udelay(100);
+	while (charlcd_4bit_read_bf(lcd) && retries)
+		retries--;
+	if (!retries)
+		dev_err(lcd->dev, "timeout waiting for busyflag\n");
+}
+
+static void charlcd_4bit_command(struct charlcd *lcd, u8 cmd)
+{
+	u32 cmdlo = (cmd << 4) & 0xf0;
+	u32 cmdhi = (cmd & 0xf0);
+
+	writel(cmdhi, lcd->virtbase + CHAR_COM);
+	udelay(10);
+	writel(cmdlo, lcd->virtbase + CHAR_COM);
+	charlcd_4bit_wait_busy(lcd);
+}
+
+static void charlcd_4bit_char(struct charlcd *lcd, u8 ch)
+{
+	u32 chlo = (ch << 4) & 0xf0;
+	u32 chhi = (ch & 0xf0);
+
+	writel(chhi, lcd->virtbase + CHAR_DAT);
+	udelay(10);
+	writel(chlo, lcd->virtbase + CHAR_DAT);
+	charlcd_4bit_wait_busy(lcd);
+}
+
+static void charlcd_4bit_print(struct charlcd *lcd, int line, const char *str)
+{
+	u8 offset;
+	int i;
+
+	/*
+	 * We support line 0, 1
+	 * Line 1 runs from 0x00..0x27
+	 * Line 2 runs from 0x28..0x4f
+	 */
+	if (line == 0)
+		offset = 0;
+	else if (line == 1)
+		offset = 0x28;
+	else
+		return;
+
+	/* Set offset */
+	charlcd_4bit_command(lcd, HD_SET_DDRAM | offset);
+
+	/* Send string */
+	for (i = 0; i < strlen(str) && i < 0x28; i++)
+		charlcd_4bit_char(lcd, str[i]);
+}
+
+static void charlcd_4bit_init(struct charlcd *lcd)
+{
+	/* These commands cannot be checked with the busy flag */
+	writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM);
+	msleep(5);
+	writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM);
+	udelay(100);
+	writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM);
+	udelay(100);
+	/* Go to 4bit mode */
+	writel(HD_FUNCSET, lcd->virtbase + CHAR_COM);
+	udelay(100);
+	/*
+	 * 4bit mode, 2 lines, 5x8 font, after this the number of lines
+	 * and the font cannot be changed until the next initialization sequence
+	 */
+	charlcd_4bit_command(lcd, HD_FUNCSET | HD_FUNCSET_2_LINES);
+	charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON);
+	charlcd_4bit_command(lcd, HD_ENTRYMODE | HD_ENTRYMODE_INCREMENT);
+	charlcd_4bit_command(lcd, HD_CLEAR);
+	charlcd_4bit_command(lcd, HD_HOME);
+	/* Put something useful in the display */
+	charlcd_4bit_print(lcd, 0, "ARM Linux");
+	charlcd_4bit_print(lcd, 1, UTS_RELEASE);
+}
+
+static void charlcd_init_work(struct work_struct *work)
+{
+	struct charlcd *lcd =
+		container_of(work, struct charlcd, init_work.work);
+
+	charlcd_4bit_init(lcd);
+}
+
+static int __init charlcd_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct charlcd *lcd;
+	struct resource *res;
+
+	lcd = kzalloc(sizeof(struct charlcd), GFP_KERNEL);
+	if (!lcd)
+		return -ENOMEM;
+
+	lcd->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -ENOENT;
+		goto out_no_resource;
+	}
+	lcd->phybase = res->start;
+	lcd->physize = resource_size(res);
+
+	if (request_mem_region(lcd->phybase, lcd->physize,
+			       DRIVERNAME) == NULL) {
+		ret = -EBUSY;
+		goto out_no_memregion;
+	}
+
+	lcd->virtbase = ioremap(lcd->phybase, lcd->physize);
+	if (!lcd->virtbase) {
+		ret = -ENOMEM;
+		goto out_no_remap;
+	}
+
+	lcd->irq = platform_get_irq(pdev, 0);
+	/* If no IRQ is supplied, we'll survive without it */
+	if (lcd->irq >= 0) {
+		if (request_irq(lcd->irq, charlcd_interrupt, IRQF_DISABLED,
+				DRIVERNAME, lcd)) {
+			ret = -EIO;
+			goto out_no_irq;
+		}
+	}
+
+	platform_set_drvdata(pdev, lcd);
+
+	/*
+	 * Initialize the display in a delayed work, because
+	 * it is VERY slow and would slow down the boot of the system.
+	 */
+	INIT_DELAYED_WORK(&lcd->init_work, charlcd_init_work);
+	schedule_delayed_work(&lcd->init_work, 0);
+
+	dev_info(&pdev->dev, "initalized ARM character LCD at %08x\n",
+		lcd->phybase);
+
+	return 0;
+
+out_no_irq:
+	iounmap(lcd->virtbase);
+out_no_remap:
+	platform_set_drvdata(pdev, NULL);
+out_no_memregion:
+	release_mem_region(lcd->phybase, SZ_4K);
+out_no_resource:
+	kfree(lcd);
+	return ret;
+}
+
+static int __exit charlcd_remove(struct platform_device *pdev)
+{
+	struct charlcd *lcd = platform_get_drvdata(pdev);
+
+	if (lcd) {
+		free_irq(lcd->irq, lcd);
+		iounmap(lcd->virtbase);
+		release_mem_region(lcd->phybase, lcd->physize);
+		platform_set_drvdata(pdev, NULL);
+		kfree(lcd);
+	}
+
+	return 0;
+}
+
+static int charlcd_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct charlcd *lcd = platform_get_drvdata(pdev);
+
+	/* Power the display off */
+	charlcd_4bit_command(lcd, HD_DISPCTRL);
+	return 0;
+}
+
+static int charlcd_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct charlcd *lcd = platform_get_drvdata(pdev);
+
+	/* Turn the display back on */
+	charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON);
+	return 0;
+}
+
+static const struct dev_pm_ops charlcd_pm_ops = {
+	.suspend = charlcd_suspend,
+	.resume = charlcd_resume,
+};
+
+static struct platform_driver charlcd_driver = {
+	.driver = {
+		.name = DRIVERNAME,
+		.owner = THIS_MODULE,
+		.pm = &charlcd_pm_ops,
+	},
+	.remove = __exit_p(charlcd_remove),
+};
+
+static int __init charlcd_init(void)
+{
+	return platform_driver_probe(&charlcd_driver, charlcd_probe);
+}
+
+static void __exit charlcd_exit(void)
+{
+	platform_driver_unregister(&charlcd_driver);
+}
+
+module_init(charlcd_init);
+module_exit(charlcd_exit);
+
+MODULE_AUTHOR("Linus Walleij <triad@df.lth.se>");
+MODULE_DESCRIPTION("ARM Character LCD Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 4917af96bae..7edae83603d 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -26,7 +26,6 @@
 #include <linux/amba/mmci.h>
 #include <linux/regulator/consumer.h>
 
-#include <asm/cacheflush.h>
 #include <asm/div64.h>
 #include <asm/io.h>
 #include <asm/sizes.h>
@@ -37,12 +36,39 @@
 
 static unsigned int fmax = 515633;
 
+/**
+ * struct variant_data - MMCI variant-specific quirks
+ * @clkreg: default value for MCICLOCK register
+ * @clkreg_enable: enable value for MMCICLOCK register
+ * @datalength_bits: number of bits in the MMCIDATALENGTH register
+ */
+struct variant_data {
+	unsigned int		clkreg;
+	unsigned int		clkreg_enable;
+	unsigned int		datalength_bits;
+};
+
+static struct variant_data variant_arm = {
+	.datalength_bits	= 16,
+};
+
+static struct variant_data variant_u300 = {
+	.clkreg_enable		= 1 << 13, /* HWFCEN */
+	.datalength_bits	= 16,
+};
+
+static struct variant_data variant_ux500 = {
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= 1 << 14, /* HWFCEN */
+	.datalength_bits	= 24,
+};
 /*
  * This must be called with host->lock held
  */
 static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
 {
-	u32 clk = 0;
+	struct variant_data *variant = host->variant;
+	u32 clk = variant->clkreg;
 
 	if (desired) {
 		if (desired >= host->mclk) {
@@ -54,8 +80,8 @@ static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
 				clk = 255;
 			host->cclk = host->mclk / (2 * (clk + 1));
 		}
-		if (host->hw_designer == AMBA_VENDOR_ST)
-			clk |= MCI_ST_FCEN; /* Bug fix in ST IP block */
+
+		clk |= variant->clkreg_enable;
 		clk |= MCI_CLK_ENABLE;
 		/* This hasn't proven to be worthwhile */
 		/* clk |= MCI_CLK_PWRSAVE; */
@@ -98,6 +124,18 @@ static void mmci_stop_data(struct mmci_host *host)
 	host->data = NULL;
 }
 
+static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
+{
+	unsigned int flags = SG_MITER_ATOMIC;
+
+	if (data->flags & MMC_DATA_READ)
+		flags |= SG_MITER_TO_SG;
+	else
+		flags |= SG_MITER_FROM_SG;
+
+	sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
+}
+
 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 {
 	unsigned int datactrl, timeout, irqmask;
@@ -109,7 +147,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 		data->blksz, data->blocks, data->flags);
 
 	host->data = data;
-	host->size = data->blksz;
+	host->size = data->blksz * data->blocks;
 	host->data_xfered = 0;
 
 	mmci_init_sg(host, data);
@@ -210,8 +248,17 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 		 * We hit an error condition.  Ensure that any data
 		 * partially written to a page is properly coherent.
 		 */
-		if (host->sg_len && data->flags & MMC_DATA_READ)
-			flush_dcache_page(sg_page(host->sg_ptr));
+		if (data->flags & MMC_DATA_READ) {
+			struct sg_mapping_iter *sg_miter = &host->sg_miter;
+			unsigned long flags;
+
+			local_irq_save(flags);
+			if (sg_miter_next(sg_miter)) {
+				flush_dcache_page(sg_miter->page);
+				sg_miter_stop(sg_miter);
+			}
+			local_irq_restore(flags);
+		}
 	}
 	if (status & MCI_DATAEND) {
 		mmci_stop_data(host);
@@ -314,15 +361,18 @@ static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int rem
 static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
 {
 	struct mmci_host *host = dev_id;
+	struct sg_mapping_iter *sg_miter = &host->sg_miter;
 	void __iomem *base = host->base;
+	unsigned long flags;
 	u32 status;
 
 	status = readl(base + MMCISTATUS);
 
 	dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
 
+	local_irq_save(flags);
+
 	do {
-		unsigned long flags;
 		unsigned int remain, len;
 		char *buffer;
 
@@ -336,11 +386,11 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
 		if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
 			break;
 
-		/*
-		 * Map the current scatter buffer.
-		 */
-		buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
-		remain = host->sg_ptr->length - host->sg_off;
+		if (!sg_miter_next(sg_miter))
+			break;
+
+		buffer = sg_miter->addr;
+		remain = sg_miter->length;
 
 		len = 0;
 		if (status & MCI_RXACTIVE)
@@ -348,31 +398,24 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
 		if (status & MCI_TXACTIVE)
 			len = mmci_pio_write(host, buffer, remain, status);
 
-		/*
-		 * Unmap the buffer.
-		 */
-		mmci_kunmap_atomic(host, buffer, &flags);
+		sg_miter->consumed = len;
 
-		host->sg_off += len;
 		host->size -= len;
 		remain -= len;
 
 		if (remain)
 			break;
 
-		/*
-		 * If we were reading, and we have completed this
-		 * page, ensure that the data cache is coherent.
-		 */
 		if (status & MCI_RXACTIVE)
-			flush_dcache_page(sg_page(host->sg_ptr));
-
-		if (!mmci_next_sg(host))
-			break;
+			flush_dcache_page(sg_miter->page);
 
 		status = readl(base + MMCISTATUS);
 	} while (1);
 
+	sg_miter_stop(sg_miter);
+
+	local_irq_restore(flags);
+
 	/*
 	 * If we're nearing the end of the read, switch to
 	 * "any data available" mode.
@@ -477,16 +520,9 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 			/* This implicitly enables the regulator */
 			mmc_regulator_set_ocr(host->vcc, ios->vdd);
 #endif
-		/*
-		 * The translate_vdd function is not used if you have
-		 * an external regulator, or your design is really weird.
-		 * Using it would mean sending in power control BOTH using
-		 * a regulator AND the 4 MMCIPWR bits. If we don't have
-		 * a regulator, we might have some other platform specific
-		 * power control behind this translate function.
-		 */
-		if (!host->vcc && host->plat->translate_vdd)
-			pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
+		if (host->plat->vdd_handler)
+			pwr |= host->plat->vdd_handler(mmc_dev(mmc), ios->vdd,
+						       ios->power_mode);
 		/* The ST version does not have this, fall through to POWER_ON */
 		if (host->hw_designer != AMBA_VENDOR_ST) {
 			pwr |= MCI_PWR_UP;
@@ -551,21 +587,10 @@ static const struct mmc_host_ops mmci_ops = {
 	.get_cd		= mmci_get_cd,
 };
 
-static void mmci_check_status(unsigned long data)
-{
-	struct mmci_host *host = (struct mmci_host *)data;
-	unsigned int status = mmci_get_cd(host->mmc);
-
-	if (status ^ host->oldstat)
-		mmc_detect_change(host->mmc, 0);
-
-	host->oldstat = status;
-	mod_timer(&host->timer, jiffies + HZ);
-}
-
 static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 {
 	struct mmci_platform_data *plat = dev->dev.platform_data;
+	struct variant_data *variant = id->data;
 	struct mmci_host *host;
 	struct mmc_host *mmc;
 	int ret;
@@ -609,6 +634,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 		goto clk_free;
 
 	host->plat = plat;
+	host->variant = variant;
 	host->mclk = clk_get_rate(host->clk);
 	/*
 	 * According to the spec, mclk is max 100 MHz,
@@ -669,6 +695,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	if (host->vcc == NULL)
 		mmc->ocr_avail = plat->ocr_mask;
 	mmc->caps = plat->capabilities;
+	mmc->caps |= MMC_CAP_NEEDS_POLL;
 
 	/*
 	 * We can do SGIO
@@ -677,10 +704,11 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	mmc->max_phys_segs = NR_SG;
 
 	/*
-	 * Since we only have a 16-bit data length register, we must
-	 * ensure that we don't exceed 2^16-1 bytes in a single request.
+	 * Since only a certain number of bits are valid in the data length
+	 * register, we must ensure that we don't exceed 2^num-1 bytes in a
+	 * single request.
 	 */
-	mmc->max_req_size = 65535;
+	mmc->max_req_size = (1 << variant->datalength_bits) - 1;
 
 	/*
 	 * Set the maximum segment size.  Since we aren't doing DMA
@@ -734,7 +762,6 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
 
 	amba_set_drvdata(dev, mmc);
-	host->oldstat = mmci_get_cd(host->mmc);
 
 	mmc_add_host(mmc);
 
@@ -742,12 +769,6 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
 		mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
 		(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
 
-	init_timer(&host->timer);
-	host->timer.data = (unsigned long)host;
-	host->timer.function = mmci_check_status;
-	host->timer.expires = jiffies + HZ;
-	add_timer(&host->timer);
-
 	return 0;
 
  irq0_free:
@@ -781,8 +802,6 @@ static int __devexit mmci_remove(struct amba_device *dev)
 	if (mmc) {
 		struct mmci_host *host = mmc_priv(mmc);
 
-		del_timer_sync(&host->timer);
-
 		mmc_remove_host(mmc);
 
 		writel(0, host->base + MMCIMASK0);
@@ -856,19 +875,28 @@ static struct amba_id mmci_ids[] = {
 	{
 		.id	= 0x00041180,
 		.mask	= 0x000fffff,
+		.data	= &variant_arm,
 	},
 	{
 		.id	= 0x00041181,
 		.mask	= 0x000fffff,
+		.data	= &variant_arm,
 	},
 	/* ST Micro variants */
 	{
 		.id     = 0x00180180,
 		.mask   = 0x00ffffff,
+		.data	= &variant_u300,
 	},
 	{
 		.id     = 0x00280180,
 		.mask   = 0x00ffffff,
+		.data	= &variant_u300,
+	},
+	{
+		.id     = 0x00480180,
+		.mask   = 0x00ffffff,
+		.data	= &variant_ux500,
 	},
 	{ 0, 0 },
 };
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index d77062e5e3a..68970cfb81e 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -28,8 +28,6 @@
 #define MCI_4BIT_BUS		(1 << 11)
 /* 8bit wide buses supported in ST Micro versions */
 #define MCI_ST_8BIT_BUS		(1 << 12)
-/* HW flow control on the ST Micro version */
-#define MCI_ST_FCEN		(1 << 13)
 
 #define MMCIARGUMENT		0x008
 #define MMCICOMMAND		0x00c
@@ -145,6 +143,7 @@
 #define NR_SG		16
 
 struct clk;
+struct variant_data;
 
 struct mmci_host {
 	void __iomem		*base;
@@ -164,6 +163,7 @@ struct mmci_host {
 	unsigned int		cclk;
 	u32			pwr;
 	struct mmci_platform_data *plat;
+	struct variant_data	*variant;
 
 	u8			hw_designer;
 	u8			hw_revision:4;
@@ -171,42 +171,9 @@ struct mmci_host {
 	struct timer_list	timer;
 	unsigned int		oldstat;
 
-	unsigned int		sg_len;
-
 	/* pio stuff */
-	struct scatterlist	*sg_ptr;
-	unsigned int		sg_off;
+	struct sg_mapping_iter	sg_miter;
 	unsigned int		size;
 	struct regulator	*vcc;
 };
 
-static inline void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
-{
-	/*
-	 * Ideally, we want the higher levels to pass us a scatter list.
-	 */
-	host->sg_len = data->sg_len;
-	host->sg_ptr = data->sg;
-	host->sg_off = 0;
-}
-
-static inline int mmci_next_sg(struct mmci_host *host)
-{
-	host->sg_ptr++;
-	host->sg_off = 0;
-	return --host->sg_len;
-}
-
-static inline char *mmci_kmap_atomic(struct mmci_host *host, unsigned long *flags)
-{
-	struct scatterlist *sg = host->sg_ptr;
-
-	local_irq_save(*flags);
-	return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
-}
-
-static inline void mmci_kunmap_atomic(struct mmci_host *host, void *buffer, unsigned long *flags)
-{
-	kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
-	local_irq_restore(*flags);
-}
diff --git a/drivers/regulator/ab3100.c b/drivers/regulator/ab3100.c
index 7b14a67bdca..11790990277 100644
--- a/drivers/regulator/ab3100.c
+++ b/drivers/regulator/ab3100.c
@@ -286,7 +286,7 @@ static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
 {
 	struct ab3100_regulator *abreg = reg->reg_data;
 
-	if (selector > abreg->vo