gpiolib support for the PXA architecture

This adds gpiolib support for the PXA architecture:
  - move all GPIO API functions from generic.c into gpio.c
  - convert the gpio_get/set_value macros into inline functions

This makes it easier to hook up GPIOs provided by external chips like
ASICs and CPLDs.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Eric Miao <eric.miao@marvell.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Minor ARM fixup from David Brownell folded into this ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 236 insertions, 122 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a322f58cdc90..e19e7744e366 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -385,6 +385,7 @@ config ARCH_PXA
         depends on MMU
         select ARCH_MTD_XIP
         select GENERIC_GPIO
+        select HAVE_GPIO_LIB
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
         select TICK_ONESHOT
diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index 8604938bd948..6e0c4f5b5ae6 100644
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -3,7 +3,8 @@
 #
 
 # Common support (must be linked before board specific support)
-obj-y                           += clock.o devices.o generic.o irq.o dma.o time.o
+obj-y                           += clock.o devices.o generic.o irq.o dma.o \
+                                   time.o gpio.o
 obj-$(CONFIG_PXA25x)            += pxa25x.o
 obj-$(CONFIG_PXA27x)            += pxa27x.o
 obj-$(CONFIG_PXA3xx)            += pxa3xx.o mfp.o smemc.o
diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 76970598f550..80721c610d41 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -32,7 +32,6 @@
 #include <asm/mach/map.h>
 
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/gpio.h>
 
 #include "generic.h"
 
@@ -67,97 +66,6 @@ unsigned int get_memclk_frequency_10khz(void)
 EXPORT_SYMBOL(get_memclk_frequency_10khz);
 
 /*
- * Handy function to set GPIO alternate functions
- */
-int pxa_last_gpio;
-
-int pxa_gpio_mode(int gpio_mode)
-{
-        unsigned long flags;
-        int gpio = gpio_mode & GPIO_MD_MASK_NR;
-        int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
-        int gafr;
-
-        if (gpio > pxa_last_gpio)
-                return -EINVAL;
-
-        local_irq_save(flags);
-        if (gpio_mode & GPIO_DFLT_LOW)
-                GPCR(gpio) = GPIO_bit(gpio);
-        else if (gpio_mode & GPIO_DFLT_HIGH)
-                GPSR(gpio) = GPIO_bit(gpio);
-        if (gpio_mode & GPIO_MD_MASK_DIR)
-                GPDR(gpio) |= GPIO_bit(gpio);
-        else
-                GPDR(gpio) &= ~GPIO_bit(gpio);
-        gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
-        GAFR(gpio) = gafr |  (fn  << (((gpio) & 0xf)*2));
-        local_irq_restore(flags);
-
-        return 0;
-}
-
-EXPORT_SYMBOL(pxa_gpio_mode);
-
-int gpio_direction_input(unsigned gpio)
-{
-        unsigned long flags;
-        u32 mask;
-
-        if (gpio > pxa_last_gpio)
-                return -EINVAL;
-
-        mask = GPIO_bit(gpio);
-        local_irq_save(flags);
-        GPDR(gpio) &= ~mask;
-        local_irq_restore(flags);
-
-        return 0;
-}
-EXPORT_SYMBOL(gpio_direction_input);
-
-int gpio_direction_output(unsigned gpio, int value)
-{
-        unsigned long flags;
-        u32 mask;
-
-        if (gpio > pxa_last_gpio)
-                return -EINVAL;
-
-        mask = GPIO_bit(gpio);
-        local_irq_save(flags);
-        if (value)
-                GPSR(gpio) = mask;
-        else
-                GPCR(gpio) = mask;
-        GPDR(gpio) |= mask;
-        local_irq_restore(flags);
-
-        return 0;
-}
-EXPORT_SYMBOL(gpio_direction_output);
-
-/*
- * Return GPIO level
- */
-int pxa_gpio_get_value(unsigned gpio)
-{
-        return __gpio_get_value(gpio);
-}
-
-EXPORT_SYMBOL(pxa_gpio_get_value);
-
-/*
- * Set output GPIO level
- */
-void pxa_gpio_set_value(unsigned gpio, int value)
-{
-        __gpio_set_value(gpio, value);
-}
-
-EXPORT_SYMBOL(pxa_gpio_set_value);
-
-/*
  * Routine to safely enable or disable a clock in the CKEN
  */
 void __pxa_set_cken(int clock, int enable)
@@ -172,7 +80,6 @@ void __pxa_set_cken(int clock, int enable)
 
         local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL(__pxa_set_cken);
 
 /*
diff --git a/arch/arm/mach-pxa/generic.h b/arch/arm/mach-pxa/generic.h
index 1a16ad3ecee6..b3d10b0e52a0 100644
--- a/arch/arm/mach-pxa/generic.h
+++ b/arch/arm/mach-pxa/generic.h
@@ -16,6 +16,7 @@ extern void __init pxa_init_irq_low(void);
 extern void __init pxa_init_irq_high(void);
 extern void __init pxa_init_irq_gpio(int gpio_nr);
 extern void __init pxa_init_irq_set_wake(int (*set_wake)(unsigned int, unsigned int));
+extern void __init pxa_init_gpio(int gpio_nr);
 extern void __init pxa25x_init_irq(void);
 extern void __init pxa27x_init_irq(void);
 extern void __init pxa3xx_init_irq(void);
diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c
new file mode 100644
index 000000000000..8638dd7dd076
--- /dev/null
+++ b/arch/arm/mach-pxa/gpio.c
@@ -0,0 +1,197 @@
+/*
+ *  linux/arch/arm/mach-pxa/gpio.c
+ *
+ *  Generic PXA GPIO handling
+ *
+ *  Author:     Nicolas Pitre
+ *  Created:    Jun 15, 2001
+ *  Copyright:  MontaVista Software Inc.
+ *
+ *  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 <asm/io.h>
+#include <asm/arch/pxa-regs.h>
+
+#include "generic.h"
+
+
+struct pxa_gpio_chip {