[ARM] 4961/1: gpiolib support for SA-1100 architecture

This adds gpiolib support for the SA-1100 arch:
 - Move all GPIO API functions from generic.c into gpio.c
 - Convert all gpio functions into gpiolib callbacks.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -426,6 +426,7 @@ config ARCH_SA1100
 	select GENERIC_GPIO
 	select GENERIC_TIME
 	select HAVE_IDE
+	select HAVE_GPIO_LIB
 	help
 	  Support for StrongARM 11x0 based boards.
 

arch/arm/mach-sa1100/Makefile

@@ -3,7 +3,7 @@
 #
 
 # Common support
-obj-y := clock.o generic.o irq.o dma.o time.o #nmi-oopser.o
+obj-y := clock.o generic.o gpio.o irq.o dma.o time.o #nmi-oopser.o
 obj-m :=
 obj-n :=
 obj-  :=

arch/arm/mach-sa1100/generic.c

@@ -139,37 +139,6 @@ unsigned long long sched_clock(void)
 	return v;
 }
 
-int gpio_direction_input(unsigned gpio)
-{
-	unsigned long flags;
-
-	if (gpio > GPIO_MAX)
-		return -EINVAL;
-
-	local_irq_save(flags);
-	GPDR &= ~GPIO_GPIO(gpio);
-	local_irq_restore(flags);
-	return 0;
-}
-
-EXPORT_SYMBOL(gpio_direction_input);
-
-int gpio_direction_output(unsigned gpio, int value)
-{
-	unsigned long flags;
-
-	if (gpio > GPIO_MAX)
-		return -EINVAL;
-
-	local_irq_save(flags);
-	gpio_set_value(gpio, value);
-	GPDR |= GPIO_GPIO(gpio);
-	local_irq_restore(flags);
-	return 0;
-}
-
-EXPORT_SYMBOL(gpio_direction_output);
-
 /*
  * Default power-off for SA1100
  */

arch/arm/mach-sa1100/generic.h

@@ -9,6 +9,7 @@ struct sys_timer;
 extern struct sys_timer sa1100_timer;
 extern void __init sa1100_map_io(void);
 extern void __init sa1100_init_irq(void);
+extern void __init sa1100_init_gpio(void);
 
 #define SET_BANK(__nr,__start,__size) \
 	mi->bank[__nr].start = (__start), \

arch/arm/mach-sa1100/gpio.c

@@ -0,0 +1,65 @@
+/*
+ * linux/arch/arm/mach-sa1100/gpio.c
+ *
+ * Generic SA-1100 GPIO handling
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/gpio.h>
+#include <asm/hardware.h>
+#include "generic.h"
+
+static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	return GPLR & GPIO_GPIO(offset);
+}
+
+static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	if (value)
+		GPSR = GPIO_GPIO(offset);
+	else
+		GPCR = GPIO_GPIO(offset);
+}
+
+static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	GPDR &= ~GPIO_GPIO(offset);
+	local_irq_restore(flags);
+	return 0;
+}
+
+static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sa1100_gpio_set(chip, offset, value);
+	GPDR |= GPIO_GPIO(offset);
+	local_irq_restore(flags);
+	return 0;
+}
+
+static struct gpio_chip sa1100_gpio_chip = {
+	.label			= "gpio",
+	.direction_input	= sa1100_direction_input,
+	.direction_output	= sa1100_direction_output,
+	.set			= sa1100_gpio_set,
+	.get			= sa1100_gpio_get,
+	.base			= 0,
+	.ngpio			= GPIO_MAX + 1,
+};
+
+void __init sa1100_init_gpio(void)
+{
+	gpiochip_add(&sa1100_gpio_chip);
+}

arch/arm/mach-sa1100/irq.c

@@ -347,4 +347,6 @@ void __init sa1100_init_irq(void)
 	 */
 	set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
 	set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
+
+	sa1100_init_gpio();
 }

include/asm-arm/arch-sa1100/gpio.h

@@ -26,35 +26,28 @@
 
 #include <asm/hardware.h>
 #include <asm/irq.h>
-
-static inline int gpio_request(unsigned gpio, const char *label)
-{
-	return 0;
-}
-
-static inline void gpio_free(unsigned gpio)
-{
-	return;
-}
-
-extern int gpio_direction_input(unsigned gpio);
-extern int gpio_direction_output(unsigned gpio, int value);
-
+#include <asm-generic/gpio.h>
 
 static inline int gpio_get_value(unsigned gpio)
 {
-	return GPLR & GPIO_GPIO(gpio);
+	if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
+		return GPLR & GPIO_GPIO(gpio);
+	else
+		return __gpio_get_value(gpio);
 }
 
 static inline void gpio_set_value(unsigned gpio, int value)
 {
-	if (value)
-		GPSR = GPIO_GPIO(gpio);
+	if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
+		if (value)
+			GPSR = GPIO_GPIO(gpio);
+		else
+			GPCR = GPIO_GPIO(gpio);
 	else
-		GPCR = GPIO_GPIO(gpio);
+		__gpio_set_value(gpio, value);
 }
 
-#include <asm-generic/gpio.h>			/* cansleep wrappers */
+#define gpio_cansleep	__gpio_cansleep
 
 static inline unsigned gpio_to_irq(unsigned gpio)
 {