[ARM] KS8695: Fixup the KS8695 GPIO to be GPIOLIB

This patch is as small a change as possible to the KS8695 GPIO layer
to use GPIOLIB to allow the generic GPIO expanders and the like to
be compiled.

As a side-effect, we also remove __init_or_module from several
functions which could be called by drivers such as i2c-gpio which
could plausibly be compiled into a non-modular kernel.

Signed-off-by: Daniel Silverstone <dsilvers@simtec.co.uk>
Signed-off-by: Vincent Sanders <vince@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/Kconfig

@@ -397,6 +397,7 @@ config ARCH_KS8695
 	bool "Micrel/Kendin KS8695"
 	select CPU_ARM922T
 	select GENERIC_GPIO
+        select ARCH_REQUIRE_GPIOLIB
 	help
 	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 	  System-on-Chip devices.

arch/arm/mach-ks8695/board-micrel.c

@@ -18,6 +18,7 @@
 #include <asm/mach/map.h>
 #include <asm/mach/irq.h>
 
+#include <mach/gpio.h>
 #include <mach/devices.h>
 
 #include "generic.h"
@@ -39,6 +40,8 @@ static void __init micrel_init(void)
 {
 	printk(KERN_INFO "Micrel KS8695 Development Board initializing\n");
 
+	ks8695_register_gpios();
+
 #ifdef CONFIG_PCI
 	ks8695_init_pci(&micrel_pci);
 #endif

arch/arm/mach-ks8695/gpio.c

@@ -2,6 +2,8 @@
  * arch/arm/mach-ks8695/gpio.c
  *
  * Copyright (C) 2006 Andrew Victor
+ * Updated to GPIOLIB, Copyright 2008 Simtec Electronics
+ *                     Daniel Silverstone <dsilvers@simtec.co.uk>
  *
  * 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
@@ -35,7 +37,7 @@
  * Configure a GPIO line for either GPIO function, or its internal
  * function (Interrupt, Timer, etc).
  */
-static void __init_or_module ks8695_gpio_mode(unsigned int pin, short gpio)
+static void ks8695_gpio_mode(unsigned int pin, short gpio)
 {
 	unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
 	unsigned long x, flags;
@@ -61,7 +63,7 @@ static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8
 /*
  * Configure GPIO pin as external interrupt source.
  */
-int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
+int ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
 {
 	unsigned long x, flags;
 
@@ -94,7 +96,7 @@ EXPORT_SYMBOL(ks8695_gpio_interrupt);
 /*
  * Configure the GPIO line as an input.
  */
-int __init_or_module gpio_direction_input(unsigned int pin)
+static int ks8695_gpio_direction_input(struct gpio_chip *gc, unsigned int pin)
 {
 	unsigned long x, flags;
 
@@ -115,13 +117,13 @@ int __init_or_module gpio_direction_input(unsigned int pin)
 
 	return 0;
 }
-EXPORT_SYMBOL(gpio_direction_input);
 
 
 /*
  * Configure the GPIO line as an output, with default state.
  */
-int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state)
+static int ks8695_gpio_direction_output(struct gpio_chip *gc,
+					unsigned int pin, int state)
 {
 	unsigned long x, flags;
 
@@ -150,13 +152,13 @@ int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state)
 
 	return 0;
 }
-EXPORT_SYMBOL(gpio_direction_output);
 
 
 /*
  * Set the state of an output GPIO line.
  */
-void gpio_set_value(unsigned int pin, unsigned int state)
+static void ks8695_gpio_set_value(struct gpio_chip *gc,
+				  unsigned int pin, int state)
 {
 	unsigned long x, flags;
 
@@ -175,13 +177,12 @@ void gpio_set_value(unsigned int pin, unsigned int state)
 
 	local_irq_restore(flags);
 }
-EXPORT_SYMBOL(gpio_set_value);
 
 
 /*
  * Read the state of a GPIO line.
  */
-int gpio_get_value(unsigned int pin)
+static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
 {
 	unsigned long x;
 
@@ -191,7 +192,6 @@ int gpio_get_value(unsigned int pin)
 	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
 	return (x & IOPD(pin)) != 0;
 }
-EXPORT_SYMBOL(gpio_get_value);
 
 
 /*
@@ -219,6 +219,25 @@ int irq_to_gpio(unsigned int irq)
 }
 EXPORT_SYMBOL(irq_to_gpio);
 
+/* GPIOLIB interface */
+
+static struct gpio_chip ks8695_gpio_chip = {
+	.label			= "KS8695",
+	.direction_input	= ks8695_gpio_direction_input,
+	.direction_output	= ks8695_gpio_direction_output,
+	.get			= ks8695_gpio_get_value,
+	.set			= ks8695_gpio_set_value,
+	.base			= 0,
+	.ngpio			= 16,
+	.can_sleep		= 0,
+};
+
+/* Register the GPIOs */
+void ks8695_register_gpios(void)
+{
+	if (gpiochip_add(&ks8695_gpio_chip))
+		printk(KERN_ERR "Unable to register core GPIOs\n");
+}
 
 /* .... Debug interface ..................................................... */
 

arch/arm/mach-ks8695/include/mach/gpio.h

@@ -30,53 +30,32 @@
 #define KS8695_GPIO_14		14
 #define KS8695_GPIO_15		15
 
-
 /*
  * Configure GPIO pin as external interrupt source.
  */
-int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type);
-
-/*
- * Configure the GPIO line as an input.
- */
-int __init_or_module gpio_direction_input(unsigned int pin);
-
-/*
- * Configure the GPIO line as an output, with default state.
- */
-int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state);
-
-/*
- * Set the state of an output GPIO line.
- */
-void gpio_set_value(unsigned int pin, unsigned int state);
-
-/*
- * Read the state of a GPIO line.
- */
-int gpio_get_value(unsigned int pin);
+extern int ks8695_gpio_interrupt(unsigned int pin, unsigned int type);
 
 /*
  * Map GPIO line to IRQ number.
  */
-int gpio_to_irq(unsigned int pin);
+extern int gpio_to_irq(unsigned int pin);
 
 /*
  * Map IRQ number to GPIO line.
  */
-int irq_to_gpio(unsigned int irq);
-
+extern int irq_to_gpio(unsigned int irq);
 
 #include <asm-generic/gpio.h>
 
-static inline int gpio_request(unsigned int pin, const char *label)
-{
-	return 0;
-}
+/* If it turns out that we need to optimise GPIO access for the
+ * Micrel's GPIOs, then these can be changed to check their argument
+ * directly as static inlines. However for now it's probably not
+ * worthwhile.
+ */
+#define gpio_get_value __gpio_get_value
+#define gpio_set_value __gpio_set_value
 
-static inline void gpio_free(unsigned int pin)
-{
-	might_sleep();
-}
+/* Register the GPIOs */
+extern void ks8695_register_gpios(void);
 
 #endif