Blackfin: GPIO: implement to_irq handler

This makes it possible to support IRQs coming from off-chip GPIO
controllers.

Signed-off-by: Joachim Eastwood <joachim.eastwood@jotron.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/include/asm/gpio.h

@@ -70,6 +70,8 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/compiler.h>
+
 /***********************************************************
 *
 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
@@ -223,6 +225,9 @@ int bfin_gpio_direction_output(unsigned gpio, int value);
 int bfin_gpio_get_value(unsigned gpio);
 void bfin_gpio_set_value(unsigned gpio, int value);
 
+#include <asm/irq.h>
+#include <asm/errno.h>
+
 #ifdef CONFIG_GPIOLIB
 #include <asm-generic/gpio.h>		/* cansleep wrappers */
 
@@ -247,6 +252,11 @@ static inline int gpio_cansleep(unsigned int gpio)
 	return __gpio_cansleep(gpio);
 }
 
+static inline int gpio_to_irq(unsigned gpio)
+{
+	return __gpio_to_irq(gpio);
+}
+
 #else /* !CONFIG_GPIOLIB */
 
 static inline int gpio_request(unsigned gpio, const char *label)
@@ -279,10 +289,6 @@ static inline void gpio_set_value(unsigned gpio, int value)
 	return bfin_gpio_set_value(gpio, value);
 }
 
-#include <asm-generic/gpio.h>		/* cansleep wrappers */
-#endif	/* !CONFIG_GPIOLIB */
-#include <asm/irq.h>
-
 static inline int gpio_to_irq(unsigned gpio)
 {
 	if (likely(gpio < MAX_BLACKFIN_GPIOS))
@@ -291,6 +297,9 @@ static inline int gpio_to_irq(unsigned gpio)
 	return -EINVAL;
 }
 
+#include <asm-generic/gpio.h>		/* cansleep wrappers */
+#endif	/* !CONFIG_GPIOLIB */
+
 static inline int irq_to_gpio(unsigned irq)
 {
 	return (irq - GPIO_IRQ_BASE);

arch/blackfin/kernel/bfin_gpio.c

@@ -1319,6 +1319,11 @@ void bfin_gpiolib_gpio_free(struct gpio_chip *chip, unsigned gpio)
 	return bfin_gpio_free(gpio);
 }
 
+int bfin_gpiolib_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
+{
+	return gpio + GPIO_IRQ_BASE;
+}
+
 static struct gpio_chip bfin_chip = {
 	.label			= "BFIN-GPIO",
 	.direction_input	= bfin_gpiolib_direction_input,
@@ -1327,6 +1332,7 @@ static struct gpio_chip bfin_chip = {
 	.set			= bfin_gpiolib_set_value,
 	.request		= bfin_gpiolib_gpio_request,
 	.free			= bfin_gpiolib_gpio_free,
+	.to_irq			= bfin_gpiolib_gpio_to_irq,
 	.base			= 0,
 	.ngpio			= MAX_BLACKFIN_GPIOS,
 };