[ARM] pxa: move IRQ handling of GPIO 0 and 1 outside of gpio.c

This is part of the work making gpio.c generic enough, the changes
include:

1. move IRQ handling of GPIO 0 and 1 outside (and back into irq.c)

2. pxa_init_gpio() accepts a range for muxed GPIO IRQs, and an IRQ
   number for the muxed GPIOs

3. __gpio_is_occupied() and __gpio_is_inverted() are made inline,
   and are moved into <mach/gpio.h> instead of generic gpio.c

Signed-off-by: Eric Miao <eric.miao@marvell.com>

1 files changed, 36 insertions, 2 deletions

diff --git a/arch/arm/mach-pxa/include/mach/gpio.h b/arch/arm/mach-pxa/include/mach/gpio.h
index 2c538d8c362d..c7ac3d62d34d 100644
--- a/arch/arm/mach-pxa/include/mach/gpio.h
+++ b/arch/arm/mach-pxa/include/mach/gpio.h
@@ -56,10 +56,44 @@ static inline void gpio_set_value(unsigned gpio, int value)
         }
 }
 
-#define gpio_cansleep __gpio_cansleep
-
+#define gpio_cansleep           __gpio_cansleep
 #define gpio_to_irq(gpio)       IRQ_GPIO(gpio)
 #define irq_to_gpio(irq)        IRQ_TO_GPIO(irq)
 
 
+#ifdef CONFIG_CPU_PXA26x
+/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
+ * as well as their Alternate Function value being '1' for GPIO in GAFRx.
+ */
+static inline int __gpio_is_inverted(unsigned gpio)
+{
+        return cpu_is_pxa25x() && gpio > 85;
+}
+#else
+static inline int __gpio_is_inverted(unsigned gpio) { return 0; }
+#endif
+
+/*
+ * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
+ * function of a GPIO, and GPDRx cannot be altered once configured. It
+ * is attributed as "occupied" here (I know this terminology isn't
+ * accurate, you are welcome to propose a better one :-)
+ */
+static inline int __gpio_is_occupied(unsigned gpio)
+{
+        if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
+                int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
+                int dir = GPDR(gpio) & GPIO_bit(gpio);
+
+                if (__gpio_is_inverted(gpio))
+                        return af != 1 || dir == 0;
+                else
+                        return af != 0 || dir != 0;
+        } else
+                return GPDR(gpio) & GPIO_bit(gpio);
+}
+
+typedef int (*set_wake_t)(unsigned int irq, unsigned int on);
+
+extern void pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn);
 #endif