8 files changed, 555 insertions, 174 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d3b29530554..b57ec09af89 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1,5 +1,5 @@
 #
-# platform-neutral GPIO infrastructure and expanders
+# GPIO infrastructure and drivers
 #
 
 config ARCH_WANT_OPTIONAL_GPIOLIB
@@ -31,7 +31,7 @@ menuconfig GPIOLIB
 	help
 	  This enables GPIO support through the generic GPIO library.
 	  You only need to enable this, if you also want to enable
-	  one or more of the GPIO expansion card drivers below.
+	  one or more of the GPIO drivers below.
 
 	  If unsure, say N.
 
@@ -63,21 +63,26 @@ config GPIO_SYSFS
 	  Kernel drivers may also request that a particular GPIO be
 	  exported to userspace; this can be useful when debugging.
 
-# put expanders in the right section, in alphabetical order
+# put drivers in the right section, in alphabetical order
 
 config GPIO_MAX730X
 	tristate
 
-comment "Memory mapped GPIO expanders:"
+comment "Memory mapped GPIO drivers:"
+
+config GPIO_BASIC_MMIO_CORE
+	tristate
+	help
+	  Provides core functionality for basic memory-mapped GPIO controllers.
 
 config GPIO_BASIC_MMIO
 	tristate "Basic memory-mapped GPIO controllers support"
+	select GPIO_BASIC_MMIO_CORE
 	help
 	  Say yes here to support basic memory-mapped GPIO controllers.
 
 config GPIO_IT8761E
 	tristate "IT8761E GPIO support"
-	depends on GPIOLIB
 	help
 	  Say yes here to support GPIO functionality of IT8761E super I/O chip.
 
@@ -101,7 +106,7 @@ config GPIO_VR41XX
 
 config GPIO_SCH
 	tristate "Intel SCH/TunnelCreek GPIO"
-	depends on GPIOLIB && PCI && X86
+	depends on PCI && X86
 	select MFD_CORE
 	select LPC_SCH
 	help
@@ -121,7 +126,7 @@ config GPIO_SCH
 
 config GPIO_VX855
 	tristate "VIA VX855/VX875 GPIO"
-	depends on GPIOLIB && MFD_SUPPORT && PCI
+	depends on MFD_SUPPORT && PCI
 	select MFD_CORE
 	select MFD_VX855
 	help
@@ -347,13 +352,13 @@ config GPIO_ML_IOH
 
 config GPIO_TIMBERDALE
 	bool "Support for timberdale GPIO IP"
-	depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
+	depends on MFD_TIMBERDALE && HAS_IOMEM
 	---help---
 	Add support for the GPIO IP in the timberdale FPGA.
 
 config GPIO_RDC321X
 	tristate "RDC R-321x GPIO support"
-	depends on PCI && GPIOLIB
+	depends on PCI
 	select MFD_SUPPORT
 	select MFD_CORE
 	select MFD_RDC321X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index becef595435..d92ce3a62ae 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -1,8 +1,4 @@
-# generic gpio support: dedicated expander chips, etc
-#
-# NOTE: platform-specific GPIO drivers don't belong in the
-# drivers/gpio directory; put them with other platform setup
-# code, IRQ controllers, board init, etc.
+# generic gpio support: platform drivers, dedicated expander chips, etc
 
 ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 
@@ -10,6 +6,7 @@ obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
 
 obj-$(CONFIG_GPIO_ADP5520)	+= adp5520-gpio.o
 obj-$(CONFIG_GPIO_ADP5588)	+= adp5588-gpio.o
+obj-$(CONFIG_GPIO_BASIC_MMIO_CORE)	+= basic_mmio_gpio.o
 obj-$(CONFIG_GPIO_BASIC_MMIO)	+= basic_mmio_gpio.o
 obj-$(CONFIG_GPIO_LANGWELL)	+= langwell_gpio.o
 obj-$(CONFIG_GPIO_MAX730X)	+= max730x.o
diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c
index 3addea65894..8152e9f516b 100644
--- a/drivers/gpio/basic_mmio_gpio.c
+++ b/drivers/gpio/basic_mmio_gpio.c
@@ -45,6 +45,7 @@ o        `                     ~~~~\___/~~~~    ` controller in FPGA is ,.`
  */
 
 #include <linux/init.h>
+#include <linux/err.h>
 #include <linux/bug.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -61,102 +62,101 @@ o        `                     ~~~~\___/~~~~    ` controller in FPGA is ,.`
 #include <linux/mod_devicetable.h>
 #include <linux/basic_mmio_gpio.h>
 
-struct bgpio_chip {
-	struct gpio_chip gc;
-	void __iomem *reg_dat;
-	void __iomem *reg_set;
-	void __iomem *reg_clr;
-
-	/* Number of bits (GPIOs): <register width> * 8. */
-	int bits;
-
-	/*
-	 * Some GPIO controllers work with the big-endian bits notation,
-	 * e.g. in a 8-bits register, GPIO7 is the least significant bit.
-	 */
-	int big_endian_bits;
-
-	/*
-	 * Used to lock bgpio_chip->data. Also, this is needed to keep
-	 * shadowed and real data registers writes together.
-	 */
-	spinlock_t lock;
-
-	/* Shadowed data register to clear/set bits safely. */
-	unsigned long data;
-};
+static void bgpio_write8(void __iomem *reg, unsigned long data)
+{
+	writeb(data, reg);
+}
 
-static struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
+static unsigned long bgpio_read8(void __iomem *reg)
 {
-	return container_of(gc, struct bgpio_chip, gc);
+	return readb(reg);
 }
 
-static unsigned long bgpio_in(struct bgpio_chip *bgc)
+static void bgpio_write16(void __iomem *reg, unsigned long data)
 {
-	switch (bgc->bits) {
-	case 8:
-		return __raw_readb(bgc->reg_dat);
-	case 16:
-		return __raw_readw(bgc->reg_dat);
-	case 32:
-		return __raw_readl(bgc->reg_dat);
-#if BITS_PER_LONG >= 64
-	case 64:
-		return __raw_readq(bgc->reg_dat);
-#endif
-	}
-	return -EINVAL;
+	writew(data, reg);
 }
 
-static void bgpio_out(struct bgpio_chip *bgc, void __iomem *reg,
-		      unsigned long data)
+static unsigned long bgpio_read16(void __iomem *reg)
 {
-	switch (bgc->bits) {
-	case 8:
-		__raw_writeb(data, reg);
-		return;
-	case 16:
-		__raw_writew(data, reg);
-		return;
-	case 32:
-		__raw_writel(data, reg);
-		return;
+	return readw(reg);
+}
+
+static void bgpio_write32(void __iomem *reg, unsigned long data)
+{
+	writel(data, reg);
+}
+
+static unsigned long bgpio_read32(void __iomem *reg)
+{
+	return readl(reg);
+}
+
 #if BITS_PER_LONG >= 64
-	case 64:
-		__raw_writeq(data, reg);
-		return;
-#endif
-	}
+static void bgpio_write64(void __iomem *reg, unsigned long data)
+{
+	writeq(data, reg);
 }
 
+static unsigned long bgpio_read64(void __iomem *reg)
+{
+	return readq(reg);
+}
+#endif /* BITS_PER_LONG >= 64 */
+
 static unsigned long bgpio_pin2mask(struct bgpio_chip *bgc, unsigned int pin)
 {
-	if (bgc->big_endian_bits)
-		return 1 << (bgc->bits - 1 - pin);
-	else
-		return 1 << pin;
+	return 1 << pin;
+}
+
+static unsigned long bgpio_pin2mask_be(struct bgpio_chip *bgc,
+				       unsigned int pin)
+{
+	return 1 << (bgc->bits - 1 - pin);
 }
 
 static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct bgpio_chip *bgc = to_bgpio_chip(gc);
 
-	return bgpio_in(bgc) & bgpio_pin2mask(bgc, gpio);
+	return bgc->read_reg(bgc->reg_dat) & bgc->pin2mask(bgc, gpio);
 }
 
 static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long mask = bgpio_pin2mask(bgc, gpio);
+	unsigned long mask = bgc->pin2mask(bgc, gpio);
 	unsigned long flags;
 
-	if (bgc->reg_set) {
-		if (val)
-			bgpio_out(bgc, bgc->reg_set, mask);
-		else
-			bgpio_out(bgc, bgc->reg_clr, mask);
-		return;
-	}
+	spin_lock_irqsave(&bgc->lock, flags);
+
+	if (val)
+		bgc->data |= mask;
+	else
+		bgc->data &= ~mask;
+
+	bgc->write_reg(bgc->reg_dat, bgc->data);
+
+	spin_unlock_irqrestore(&bgc->lock, flags);
+}
+
+static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
+				 int val)
+{
+	struct bgpio_chip *bgc = to_bgpio_chip(gc);
+	unsigned long mask = bgc->pin2mask(bgc, gpio);
+
+	if (val)
+		bgc->write_reg(bgc->reg_set, mask);
+	else
+		bgc->write_reg(bgc->reg_clr, mask);
+}
+
+static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+	struct bgpio_chip *bgc = to_bgpio_chip(gc);
+	unsigned long mask = bgc->pin2mask(bgc, gpio);
+	unsigned long flags;
 
 	spin_lock_irqsave(&bgc->lock, flags);
 
@@ -165,103 +165,352 @@ static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	else
 		bgc->data &= ~mask;
 
-	bgpio_out(bgc, bgc->reg_dat, bgc->data);
+	bgc->write_reg(bgc->reg_set, bgc->data);
 
 	spin_unlock_irqrestore(&bgc->lock, flags);
 }
 
+static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+	return 0;
+}
+
+static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio,
+				int val)
+{
+	gc->set(gc, gpio, val);
+
+	return 0;
+}
+
 static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
+	struct bgpio_chip *bgc = to_bgpio_chip(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&bgc->lock, flags);
+
+	bgc->dir &= ~bgc->pin2mask(bgc, gpio);
+	bgc->write_reg(bgc->reg_dir, bgc->dir);
+
+	spin_unlock_irqrestore(&bgc->lock, flags);
+
 	return 0;
 }
 
 static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 {
-	bgpio_set(gc, gpio, val);
+	struct bgpio_chip *bgc = to_bgpio_chip(gc);
+	unsigned long flags;
+
+	gc->set(gc, gpio, val);
+
+	spin_lock_irqsave(&bgc->lock, flags);
+
+	bgc->dir |= bgc->pin2mask(bgc, gpio);
+	bgc->write_reg(bgc->reg_dir, bgc->dir);
+
+	spin_unlock_irqrestore(&bgc->lock, flags);
+
 	return 0;
 }
 
-static int __devinit bgpio_probe(struct platform_device *pdev)
+static int bgpio_dir_in_inv(struct gpio_chip *gc, unsigned int gpio)
 {
-	const struct platform_device_id *platid = platform_get_device_id(pdev);
-	struct device *dev = &pdev->dev;
-	struct bgpio_pdata *pdata = dev_get_platdata(dev);
-	struct bgpio_chip *bgc;
-	struct resource *res_dat;
-	struct resource *res_set;
-	struct resource *res_clr;
-	resource_size_t dat_sz;
-	int bits;
-	int ret;
+	struct bgpio_chip *bgc = to_bgpio_chip(gc);
+	unsigned long flags;
 
-	res_dat = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
-	if (!res_dat)
-		return -EINVAL;
+	spin_lock_irqsave(&bgc->lock, flags);
 
-	dat_sz = resource_size(res_dat);
-	if (!is_power_of_2(dat_sz))
-		return -EINVAL;
+	bgc->dir |= bgc->pin2mask(bgc, gpio);
+	bgc->write_reg(bgc->reg_dir, bgc->dir);
+
+	spin_unlock_irqrestore(&bgc->lock, flags);
+
+	return 0;
+}
 
-	bits = dat_sz * 8;
-	if (bits > BITS_PER_LONG)
+static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+	struct bgpio_chip *bgc = to_bgpio_chip(gc);
+	unsigned long flags;
+
+	gc->set(gc, gpio, val);
+
+	spin_lock_irqsave(&bgc->lock, flags);
+
+	bgc->dir &= ~bgc->pin2mask(bgc, gpio);
+	bgc->write_reg(bgc->reg_dir, bgc->dir);
+
+	spin_unlock_irqrestore(&bgc->lock, flags);
+
+	return 0;
+}
+
+static int bgpio_setup_accessors(struct device *dev,
+				 struct bgpio_chip *bgc,
+				 bool be)
+{
+
+	switch (bgc->bits) {
+	case 8:
+		bgc->read_reg	= bgpio_read8;
+		bgc->write_reg	= bgpio_write8;
+		break;
+	case 16:
+		bgc->read_reg	= bgpio_read16;
+		bgc->write_reg	= bgpio_write16;
+		break;
+	case 32:
+		bgc->read_reg	= bgpio_read32;
+		bgc->write_reg	= bgpio_write32;
+		break;
+#if BITS_PER_LONG >= 64
+	case 64:
+		bgc->read_reg	= bgpio_read64;
+		bgc->write_reg	= bgpio_write64;
+		break;
+#endif /* BITS_PER_LONG >= 64 */
+	default:
+		dev_err(dev, "unsupported data width %u bits\n", bgc->bits);
 		return -EINVAL;
+	}
 
-	bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL);
-	if (!bgc)
-		return -ENOMEM;
+	bgc->pin2mask = be ? bgpio_pin2mask_be : bgpio_pin2mask;
+
+	return 0;
+}
+
+/*
+ * Create the device and allocate the resources.  For setting GPIO's there are
+ * three supported configurations:
+ *
+ *	- single input/output register resource (named "dat").
+ *	- set/clear pair (named "set" and "clr").
+ *	- single output register resource and single input resource ("set" and
+ *	dat").
+ *
+ * For the single output register, this drives a 1 by setting a bit and a zero
+ * by clearing a bit.  For the set clr pair, this drives a 1 by setting a bit
+ * in the set register and clears it by setting a bit in the clear register.
+ * The configuration is detected by which resources are present.
+ *
+ * For setting the GPIO direction, there are three supported configurations:
+ *
+ *	- simple bidirection GPIO that requires no configuration.
+ *	- an output direction register (named "dirout") where a 1 bit
+ *	indicates the GPIO is an output.
+ *	- an input direction register (named "dirin") where a 1 bit indicates
+ *	the GPIO is an input.
+ */
+static int bgpio_setup_io(struct bgpio_chip *bgc,
+			  void __iomem *dat,
+			  void __iomem *set,
+			  void __iomem *clr)
+{
 
-	bgc->reg_dat = devm_ioremap(dev, res_dat->start, dat_sz);
+	bgc->reg_dat = dat;
 	if (!bgc->reg_dat)
-		return -ENOMEM;
+		return -EINVAL;
+
+	if (set && clr) {
+		bgc->reg_set = set;
+		bgc->reg_clr = clr;
+		bgc->gc.set = bgpio_set_with_clear;
+	} else if (set && !clr) {
+		bgc->reg_set = set;
+		bgc->gc.set = bgpio_set_set;
+	} else {
+		bgc->gc.set = bgpio_set;
+	}
+
+	bgc->gc.get = bgpio_get;
+
+	return 0;
+}
 
-	res_set = platform_get_resource_byname(pdev, IORESOURCE_MEM, "set");
-	res_clr = platform_get_resource_byname(pdev, IORESOURCE_MEM, "clr");
-	if (res_set && res_clr) {
-		if (resource_size(res_set) != resource_size(res_clr) ||
-				resource_size(res_set) != dat_sz)
-			return -EINVAL;
-
-		bgc->reg_set = devm_ioremap(dev, res_set->start, dat_sz);
-		bgc->reg_clr = devm_ioremap(dev, res_clr->start, dat_sz);
-		if (!bgc->reg_set || !bgc->reg_clr)
-			return -ENOMEM;
-	} else if (res_set || res_clr) {
+static int bgpio_setup_direction(struct bgpio_chip *bgc,
+				 void __iomem *dirout,
+				 void __iomem *dirin)
+{
+	if (dirout && dirin) {
 		return -EINVAL;
+	} else if (dirout) {
+		bgc->reg_dir = dirout;
+		bgc->gc.direction_output = bgpio_dir_out;
+		bgc->gc.direction_input = bgpio_dir_in;
+	} else if (dirin) {
+		bgc->reg_dir = dirin;
+		bgc->gc.direction_output = bgpio_dir_out_inv;
+		bgc->gc.direction_input = bgpio_dir_in_inv;
+	} else {
+		bgc->gc.direction_output = bgpio_simple_dir_out;
+		bgc->gc.direction_input = bgpio_simple_dir_in;
 	}
 
-	spin_lock_init(&bgc->lock);
+	return 0;
+}
 
-	bgc->bits = bits;
-	bgc->big_endian_bits = !strcmp(platid->name, "basic-mmio-gpio-be");
-	bgc->data = bgpio_in(bgc);
+int __devexit bgpio_remove(struct bgpio_chip *bgc)
+{
+	int err = gpiochip_remove(&bgc->gc);
 
-	bgc->gc.ngpio = bits;
-	bgc->gc.direction_input = bgpio_dir_in;
-	bgc->gc.direction_output = bgpio_dir_out;
-	bgc->gc.get = bgpio_get;
-	bgc->gc.set = bgpio_set;
+	kfree(bgc);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(bgpio_remove);
+
+int __devinit bgpio_init(struct bgpio_chip *bgc,
+			 struct device *dev,
+			 unsigned long sz,
+			 void __iomem *dat,
+			 void __iomem *set,
+			 void __iomem *clr,
+			 void __iomem *dirout,
+			 void __iomem *dirin,
+			 bool big_endian)
+{
+	int ret;
+
+	if (!is_power_of_2(sz))
+		return -EINVAL;
+
+	bgc->bits = sz * 8;
+	if (bgc->bits > BITS_PER_LONG)
+		return -EINVAL;
+
+	spin_lock_init(&bgc->lock);
 	bgc->gc.dev = dev;
 	bgc->gc.label = dev_name(dev);
+	bgc->gc.base = -1;
+	bgc->gc.ngpio = bgc->bits;
 
-	if (pdata)
-		bgc->gc.base = pdata->base;
-	else
-		bgc->gc.base = -1;
+	ret = bgpio_setup_io(bgc, dat, set, clr);
+	if (ret)
+		return ret;
 
-	dev_set_drvdata(dev, bgc);
+	ret = bgpio_setup_accessors(dev, bgc, big_endian);
+	if (ret)
+		return ret;
 
-	ret = gpiochip_add(&bgc->gc);
+	ret = bgpio_setup_direction(bgc, dirout, dirin);
 	if (ret)
-		dev_err(dev, "gpiochip_add() failed: %d\n", ret);
+		return ret;
+
+	bgc->data = bgc->read_reg(bgc->reg_dat);
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(bgpio_init);
+
+#ifdef CONFIG_GPIO_BASIC_MMIO
 
-static int __devexit bgpio_remove(struct platform_device *pdev)
+static void __iomem *bgpio_map(struct platform_device *pdev,
+			       const char *name,
+			       resource_size_t sane_sz,
+			       int *err)
 {
-	struct bgpio_chip *bgc = dev_get_drvdata(&pdev->dev);
+	struct device *dev = &pdev->dev;
+	struct resource *r;
+	resource_size_t start;
+	resource_size_t sz;
+	void __iomem *ret;
+
+	*err = 0;
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
+	if (!r)
+		return NULL;
 
-	return gpiochip_remove(&bgc->gc);
+	sz = resource_size(r);
+	if (sz != sane_sz) {
+		*err = -EINVAL;
+		return NULL;
+	}
+
+	start = r->start;
+	if (!devm_request_mem_region(dev, start, sz, r->name)) {
+		*err = -EBUSY;
+		return NULL;
+	}
+
+	ret = devm_ioremap(dev, start, sz);
+	if (!ret) {
+		*err = -ENOMEM;
+		return NULL;
+	}
+
+	return ret;
+}
+
+static int __devinit bgpio_pdev_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *r;
+	void __iomem *dat;
+	void __iomem *set;
+	void __iomem *clr;
+	void __iomem *dirout;
+	void __iomem *dirin;
+	unsigned long sz;
+	bool be;
+	int err;
+	struct bgpio_chip *bgc;
+	struct bgpio_pdata *pdata = dev_get_platdata(dev);
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
+	if (!r)
+		return -EINVAL;
+
+	sz = resource_size(r);
+
+	dat = bgpio_map(pdev, "dat", sz, &err);
+	if (!dat)
+		return err ? err : -EINVAL;
+
+	set = bgpio_map(pdev, "set", sz, &err);
+	if (err)
+		return err;
+
+	clr = bgpio_map(pdev, "clr", sz, &err);
+	if (err)
+		return err;
+
+	dirout = bgpio_map(pdev, "dirout", sz, &err);
+	if (err)
+		return err;
+
+	dirin = bgpio_map(pdev, "dirin", sz, &err);
+	if (err)
+		return err;
+
+	be = !strcmp(platform_get_device_id(pdev)->name, "basic-mmio-gpio-be");
+
+	bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
+	if (!bgc)
+		return -ENOMEM;
+
+	err = bgpio_init(bgc, dev, sz, dat, set, clr, dirout, dirin, be);
+	if (err)
+		return err;
+
+	if (pdata) {
+		bgc->gc.base = pdata->base;
+		if (pdata->ngpio > 0)
+			bgc->gc.ngpio = pdata->ngpio;
+	}
+
+	platform_set_drvdata(pdev, bgc);
+
+	return gpiochip_add(&bgc->gc);
+}
+
+static int __devexit bgpio_pdev_remove(struct platform_device *pdev)
+{
+	struct bgpio_chip *bgc = platform_get_drvdata(pdev);
+
+	return bgpio_remove(bgc);
 }
 
 static const struct platform_device_id bgpio_id_table[] = {
@@ -276,21 +525,23 @@ static struct platform_driver bgpio_driver = {
 		.name = "basic-mmio-gpio",
 	},
 	.id_table = bgpio_id_table,
-	.probe = bgpio_probe,
-	.remove = __devexit_p(bgpio_remove),
+	.probe = bgpio_pdev_probe,
+	.remove = __devexit_p(bgpio_pdev_remove),
 };
 
-static int __init bgpio_init(void)
+static int __init bgpio_platform_init(void)
 {
 	return platform_driver_register(&bgpio_driver);
 }
-module_init(bgpio_init);
+module_init(bgpio_platform_init);
 
-static void __exit bgpio_exit(void)
+static void __exit bgpio_platform_exit(void)
 {
 	platform_driver_unregister(&bgpio_driver);
 }
-module_exit(bgpio_exit);
+module_exit(bgpio_platform_exit);
+
+#endif /* CONFIG_GPIO_BASIC_MMIO */
 
 MODULE_DESCRIPTION("Driver for basic memory-mapped GPIO controllers");
 MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 36a2974815b..137a8ca6782 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -12,6 +12,8 @@
 #include <linux/idr.h>
 #include <linux/slab.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/gpio.h>
 
 /* Optional implementation infrastructure for GPIO interfaces.
  *
@@ -1165,6 +1167,7 @@ struct gpio_chip *gpiochip_find(void *data,
 
 	return chip;
 }
+EXPORT_SYMBOL_GPL(gpiochip_find);
 
 /* These "optional" allocation calls help prevent drivers from stomping
  * on each other, and help provide better diagnostics in debugfs.
@@ -1404,6 +1407,8 @@ int gpio_direction_input(unsigned gpio)
 	status = chip->direction_input(chip, gpio);
 	if (status == 0)
 		clear_bit(FLAG_IS_OUT, &desc->flags);
+
+	trace_gpio_direction(chip->base + gpio, 1, status);
 lose:
 	return status;
 fail:
@@ -1457,6 +1462,8 @@ int gpio_direction_output(unsigned gpio, int value)
 	status = chip->direction_output(chip, gpio, value);
 	if (status == 0)
 		set_bit(FLAG_IS_OUT, &desc->flags);
+	trace_gpio_value(chip->base + gpio, 0, value);
+	trace_gpio_direction(chip->base + gpio, 0, status);
 lose:
 	return status;
 fail:
@@ -1546,10 +1553,13 @@ EXPORT_SYMBOL_GPL(gpio_set_debounce);
 int __gpio_get_value(unsigned gpio)
 {
 	struct gpio_chip	*chip;
+	int value;
 
 	chip = gpio_to_chip(gpio);
 	WARN_ON(chip->can_sleep);
-	return chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	value = chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	trace_gpio_value(gpio, 1, value);
+	return value;
 }
 EXPORT_SYMBOL_GPL(__gpio_get_value);
 
@@ -1568,6 +1578,7 @@ void __gpio_set_value(unsigned gpio, int value)
 
 	chip = gpio_to_chip(gpio);
 	WARN_ON(chip->can_sleep);
+	trace_gpio_value(gpio, 0, value);
 	chip->set(chip, gpio - chip->base, value);
 }
 EXPORT_SYMBOL_GPL(__gpio_set_value);
@@ -1618,10 +1629,13 @@ EXPORT_SYMBOL_GPL(__gpio_to_irq);
 int gpio_get_value_cansleep(unsigned gpio)
 {
 	struct gpio_chip	*chip;
+	int value;
 
 	might_sleep_if(extra_checks);
 	chip = gpio_to_chip(gpio);
-	return chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	value = chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	trace_gpio_value(gpio, 1, value);
+	return value;
 }
 EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
 
@@ -1631,6 +1645,7 @@ void gpio_set_value_cansleep(unsigned gpio, int value)
 
 	might_sleep_if(extra_checks);
 	chip = gpio_to_chip(gpio);
+	trace_gpio_value(gpio, 0, value);
 	chip->set(chip, gpio - chip->base, value);
 }
 EXPORT_SYMBOL_GPL(gpio_set_value_cansleep);
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 7630ab7b9be..78a843947d8 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -397,7 +397,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 
 			irq_set_chip_data(irq, chip);
 			irq_set_chip_and_handler(irq, &pca953x_irq_chip,
-						 handle_edge_irq);
+						 handle_simple_irq);
 #ifdef CONFIG_ARM
 			set_irq_flags(irq, IRQF_VALID);
 #else
diff --git a/drivers/video/via/via-gpio.c b/drivers/video/via/via-gpio.c
index c2a0a1cfd3b..ab5341814c7 100644
--- a/drivers/video/via/via-gpio.c
+++ b/drivers/video/via/via-gpio.c
@@ -145,7 +145,7 @@ static int via_gpio_get(struct gpio_chip *chip, unsigned int nr)
 }
 
 
-static struct viafb_gpio_cfg gpio_config = {
+static struct viafb_gpio_cfg viafb_gpio_config = {
 	.gpio_chip = {
 		.label = "VIAFB onboard GPIO",
 		.owner = THIS_MODULE,
@@ -183,8 +183,8 @@ static int viafb_gpio_resume(void *private)
 {
 	int i;
 
-	for (i = 0; i < gpio_config.gpio_chip.ngpio; i += 2)
-		viafb_gpio_enable(gpio_config.active_gpios[i]);
+	for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i += 2)
+		viafb_gpio_enable(viafb_gpio_config.active_gpios[i]);
 	return 0;
 }
 
@@ -201,9 +201,9 @@ int viafb_gpio_lookup(const char *name)
 {
 	int i;
 
-	for (i = 0; i < gpio_config.gpio_chip.ngpio; i++)
-		if (!strcmp(name, gpio_config.active_gpios[i]->vg_name))
-			return gpio_config.gpio_chip.base + i;
+	for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i++)
+		if (!strcmp(name, viafb_gpio_config.active_gpios[i]->vg_name))
+			return viafb_gpio_config.gpio_chip.base + i;
 	return -1;
 }
 EXPORT_SYMBOL_GPL(viafb_gpio_lookup);
@@ -229,14 +229,15 @@ static __devinit int viafb_gpio_probe(struct platform_device *platdev)
 		for (gpio = viafb_all_gpios;
 		     gpio < viafb_all_gpios + VIAFB_NUM_GPIOS; gpio++)
 			if (gpio->vg_port_index == port_cfg[i].ioport_index) {
-				gpio_config.active_gpios[ngpio] = gpio;
-				gpio_config.gpio_names[ngpio] = gpio->vg_name;
+				viafb_gpio_config.active_gpios[ngpio] = gpio;
+				viafb_gpio_config.gpio_names[ngpio] =
+					gpio->vg_name;
 				ngpio++;
 			}
 	}
-	gpio_config.gpio_chip.ngpio = ngpio;
-	gpio_config.gpio_chip.names = gpio_config.gpio_names;
-	gpio_config.vdev = vdev;
+	viafb_gpio_config.gpio_chip.ngpio = ngpio;
+	viafb_gpio_config.gpio_chip.names = viafb_gpio_config.gpio_names;
+	viafb_gpio_config.vdev = vdev;
 	if (ngpio == 0) {
 		printk(KERN_INFO "viafb: no GPIOs configured\n");
 		return 0;
@@ -245,18 +246,18 @@ static __devinit int viafb_gpio_probe(struct platform_device *platdev)
 	 * Enable the ports.  They come in pairs, with a single
 	 * enable bit for both.
 	 */
-	spin_lock_irqsave(&gpio_config.vdev->reg_lock, flags);
+	spin_lock_irqsave(&viafb_gpio_config.vdev->reg_lock, flags);
 	for (i = 0; i < ngpio; i += 2)
-		viafb_gpio_enable(gpio_config.active_gpios[i]);
-	spin_unlock_irqrestore(&gpio_config.vdev->reg_lock, flags);
+		viafb_gpio_enable(viafb_gpio_config.active_gpios[i]);
+	spin_unlock_irqrestore(&viafb_gpio_config.vdev->reg_lock, flags);
 	/*
 	 * Get registered.
 	 */
-	gpio_config.gpio_chip.base = -1;  /* Dynamic */
-	ret = gpiochip_add(&gpio_config.gpio_chip);
+	viafb_gpio_config.gpio_chip.base = -1;  /* Dynamic */
+	ret = gpiochip_add(&viafb_gpio_config.gpio_chip);
 	if (ret) {
 		printk(KERN_ERR "viafb: failed to add gpios (%d)\n", ret);
-		gpio_config.gpio_chip.ngpio = 0;
+		viafb_gpio_config.gpio_chip.ngpio = 0;
 	}
 #ifdef CONFIG_PM
 	viafb_pm_register(&viafb_gpio_pm_hooks);
@@ -277,8 +278,8 @@ static int viafb_gpio_remove(struct platform_device *platdev)
 	/*
 	 * Get unregistered.
 	 */
-	if (gpio_config.gpio_chip.ngpio > 0) {
-		ret = gpiochip_remove(&gpio_config.gpio_chip);
+	if (viafb_gpio_config.gpio_chip.ngpio > 0) {
+		ret = gpiochip_remove(&viafb_gpio_config.gpio_chip);
 		if (ret) { /* Somebody still using it? */
 			printk(KERN_ERR "Viafb: GPIO remove failed\n");
 			return ret;
@@ -287,11 +288,11 @@ static int viafb_gpio_remove(struct platform_device *platdev)
 	/*
 	 * Disable the ports.
 	 */
-	spin_lock_irqsave(&gpio_config.vdev->reg_lock, flags);
-	for (i = 0; i < gpio_config.gpio_chip.ngpio; i += 2)
-		viafb_gpio_disable(gpio_config.active_gpios[i]);
-	gpio_config.gpio_chip.ngpio = 0;
-	spin_unlock_irqrestore(&gpio_config.vdev->reg_lock, flags);
+	spin_lock_irqsave(&viafb_gpio_config.vdev->reg_lock, flags);
+	for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i += 2)
+		viafb_gpio_disable(viafb_gpio_config.active_gpios[i]);
+	viafb_gpio_config.gpio_chip.ngpio = 0;
+	spin_unlock_irqrestore(&viafb_gpio_config.vdev->reg_lock, flags);
 	return ret;
 }
 
diff --git a/include/linux/basic_mmio_gpio.h b/include/linux/basic_mmio_gpio.h
index 198087a16fc..1ae12710d73 100644
--- a/include/linux/basic_mmio_gpio.h
+++ b/include/linux/basic_mmio_gpio.h
@@ -13,8 +13,64 @@
 #ifndef __BASIC_MMIO_GPIO_H
 #define __BASIC_MMIO_GPIO_H
 
+#include <linux/gpio.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+
 struct bgpio_pdata {
 	int base;
+	int ngpio;
 };
 
+struct device;
+
+struct bgpio_chip {
+	struct gpio_chip gc;
+
+	unsigned long (*read_reg)(void __iomem *reg);
+	void (*write_reg)(void __iomem *reg, unsigned long data);
+
+	void __iomem *reg_dat;
+	void __iomem *reg_set;
+	void __iomem *reg_clr;
+	void __iomem *reg_dir;
+
+	/* Number of bits (GPIOs): <register width> * 8. */
+	int bits;
+
+	/*
+	 * Some GPIO controllers work with the big-endian bits notation,
+	 * e.g. in a 8-bits register, GPIO7 is the least significant bit.
+	 */
+	unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
+
+	/*
+	 * Used to lock bgpio_chip->data. Also, this is needed to keep
+	 * shadowed and real data registers writes together.
+	 */
+	spinlock_t lock;
+
+	/* Shadowed data register to clear/set bits safely. */
+	unsigned long data;
+
+	/* Shadowed direction registers to clear/set direction safely. */
+	unsigned long dir;
+};
+
+static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bgpio_chip, gc);
+}
+
+int __devexit bgpio_remove(struct bgpio_chip *bgc);
+int __devinit bgpio_init(struct bgpio_chip *bgc,
+			 struct device *dev,
+			 unsigned long sz,
+			 void __iomem *dat,
+			 void __iomem *set,
+			 void __iomem *clr,
+			 void __iomem *dirout,
+			 void __iomem *dirin,
+			 bool big_endian);
+
 #endif /* __BASIC_MMIO_GPIO_H */
diff --git a/include/trace/events/gpio.h b/include/trace/events/gpio.h
new file mode 100644
index 00000000000..927a8ad9e51
--- /dev/null
+++ b/include/trace/events/gpio.h
@@ -0,0 +1,56 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM gpio
+
+#if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_GPIO_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(gpio_direction,
+
+	TP_PROTO(unsigned gpio, int in, int err),
+
+	TP_ARGS(gpio, in, err),
+
+	TP_STRUCT__entry(
+		__field(unsigned, gpio)
+		__field(int, in)
+		__field(int, err)
+	),
+
+	TP_fast_assign(
+		__entry->gpio = gpio;
+		__entry->in = in;
+		__entry->err = err;
+	),
+
+	TP_printk("%u %3s (%d)", __entry->gpio,
+		__entry->in ? "in" : "out", __entry->err)
+);
+
+TRACE_EVENT(gpio_value,
+
+	TP_PROTO(unsigned gpio, int get, int value),
+
+	TP_ARGS(gpio, get, value),
+
+	TP_STRUCT__entry(
+		__field(unsigned, gpio)
+		__field(int, get)
+		__field(int, value)
+	),
+
+	TP_fast_assign(
+		__entry->gpio = gpio;
+		__entry->get = get;
+		__entry->value = value;
+	),
+
+	TP_printk("%u %3s %d", __entry->gpio,
+		__entry->get ? "get" : "set", __entry->value)
+);
+
+#endif /* if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>