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>

2 files changed, 33 insertions, 28 deletions

diff --git a/include/asm-arm/arch-pxa/gpio.h b/include/asm-arm/arch-pxa/gpio.h
index 9dbc2dc794f7..bdbf5f9ffdd5 100644
--- a/include/asm-arm/arch-pxa/gpio.h
+++ b/include/asm-arm/arch-pxa/gpio.h
@@ -28,43 +28,35 @@
 #include <asm/irq.h>
 #include <asm/hardware.h>
 
-static inline int gpio_request(unsigned gpio, const char *label)
-{
-        return 0;
-}
+#include <asm-generic/gpio.h>
 
-static inline void gpio_free(unsigned gpio)
-{
-        return;
-}
 
-extern int gpio_direction_input(unsigned gpio);
-extern int gpio_direction_output(unsigned gpio, int value);
+/* NOTE: some PXAs have fewer on-chip GPIOs (like PXA255, with 85).
+ * Those cases currently cause holes in the GPIO number space.
+ */
+#define NR_BUILTIN_GPIO 128
 
-static inline int __gpio_get_value(unsigned gpio)
+static inline int gpio_get_value(unsigned gpio)
 {
-        return GPLR(gpio) & GPIO_bit(gpio);
+        if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO))
+                return GPLR(gpio) & GPIO_bit(gpio);
+        else
+                return __gpio_get_value(gpio);
 }
 
-#define gpio_get_value(gpio)                    \
-        (__builtin_constant_p(gpio) ?           \
-         __gpio_get_value(gpio) :               \
-         pxa_gpio_get_value(gpio))
-
-static inline void __gpio_set_value(unsigned gpio, int value)
+static inline void gpio_set_value(unsigned gpio, int value)
 {
-        if (value)
-                GPSR(gpio) = GPIO_bit(gpio);
-        else
-                GPCR(gpio) = GPIO_bit(gpio);
+        if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO)) {
+                if (value)
+                        GPSR(gpio) = GPIO_bit(gpio);
+                else
+                        GPCR(gpio) = GPIO_bit(gpio);
+        } else {
+                __gpio_set_value(gpio, value);
+        }
 }
 
-#define gpio_set_value(gpio,value)              \
-        (__builtin_constant_p(gpio) ?           \
-         __gpio_set_value(gpio, value) :        \
-         pxa_gpio_set_value(gpio, value))
-
-#include <asm-generic/gpio.h>                   /* cansleep wrappers */
+#define gpio_cansleep __gpio_cansleep
 
 #define gpio_to_irq(gpio)       IRQ_GPIO(gpio)
 #define irq_to_gpio(irq)        IRQ_TO_GPIO(irq)
diff --git a/include/asm-arm/arch-pxa/pxa-regs.h b/include/asm-arm/arch-pxa/pxa-regs.h
index 16ed24dbda4e..ac175b4d10cb 100644
--- a/include/asm-arm/arch-pxa/pxa-regs.h
+++ b/include/asm-arm/arch-pxa/pxa-regs.h
@@ -1131,6 +1131,19 @@
  * General Purpose I/O
  */
 
+#define GPIO0_BASE      ((void __iomem *)io_p2v(0x40E00000))
+#define GPIO1_BASE      ((void __iomem *)io_p2v(0x40E00004))
+#define GPIO2_BASE      ((void __iomem *)io_p2v(0x40E00008))
+#define GPIO3_BASE      ((void __iomem *)io_p2v(0x40E00100))
+
+#define GPLR_OFFSET     0x00
+#define GPDR_OFFSET     0x0C
+#define GPSR_OFFSET     0x18
+#define GPCR_OFFSET     0x24
+#define GRER_OFFSET     0x30
+#define GFER_OFFSET     0x3C
+#define GEDR_OFFSET     0x48
+
 #define GPLR0           __REG(0x40E00000)  /* GPIO Pin-Level Register GPIO<31:0> */
 #define GPLR1           __REG(0x40E00004)  /* GPIO Pin-Level Register GPIO<63:32> */
 #define GPLR2           __REG(0x40E00008)  /* GPIO Pin-Level Register GPIO<80:64> */