[ARM] pxa: allow dynamic enable/disable of GPIO wakeup for pxa{25x,27x}

Changes include:

1. rename MFP_LPM_WAKEUP_ENABLE into MFP_LPM_CAN_WAKEUP to indicate
   the board capability of this pin to wakeup the system

2. add gpio_set_wake() and keypad_set_wake() to allow dynamically
   enable/disable wakeup from GPIOs and keypad GPIO

   * these functions are currently kept in mfp-pxa2xx.c due to their
     dependency to the MFP configuration

3. pxa2xx_mfp_config() only gives early warning if MFP_LPM_CAN_WAKEUP
   is set on incorrect pins

So that the GPIO's wakeup capability is now decided by the following:

   a) processor's capability: (only those GPIOs which have dedicated
      bits within PWER/PRER/PFER can wakeup the system), this is
      initialized by pxa{25x,27x}_init_mfp()

   b) board design decides:
      - whether the pin is designed to wakeup the system (some of
        the GPIOs are configured as other functions, which is not
        intended to be a wakeup source), by OR'ing the pin config
        with MFP_LPM_CAN_WAKEUP

      - which edge the pin is designed to wakeup the system, this
        may depends on external peripherals/connections, which is
        totally board specific; this is indicated by MFP_LPM_EDGE_*

   c) the corresponding device's (most likely the gpio_keys.c) wakeup
      attribute:

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 5 insertions, 26 deletions

diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index 87ade40865f..b230af22ae0 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -23,6 +23,7 @@
 #include <asm/arch/irqs.h>
 #include <asm/arch/pxa-regs.h>
 #include <asm/arch/pxa2xx-regs.h>
+#include <asm/arch/mfp-pxa27x.h>
 #include <asm/arch/ohci.h>
 #include <asm/arch/pm.h>
 #include <asm/arch/dma.h>
@@ -286,37 +287,16 @@ static inline void pxa27x_init_pm(void) {}
 /* PXA27x:  Various gpios can issue wakeup events.  This logic only
  * handles the simple cases, not the WEMUX2 and WEMUX3 options
  */
-#define PXA27x_GPIO_NOWAKE_MASK \
-        ((1 << 8) | (1 << 7) | (1 << 6) | (1 << 5) | (1 << 2))
-#define WAKEMASK(gpio) \
-        (((gpio) <= 15) \
-                 ? ((1 << (gpio)) & ~PXA27x_GPIO_NOWAKE_MASK) \
-                 : ((gpio == 35) ? (1 << 24) : 0))
-
 static int pxa27x_set_wake(unsigned int irq, unsigned int on)
 {
 	int gpio = IRQ_TO_GPIO(irq);
 	uint32_t mask;
 
-	if ((gpio >= 0 && gpio <= 15) || (gpio == 35)) {
-		if (WAKEMASK(gpio) == 0)
-			return -EINVAL;
-
-		mask = WAKEMASK(gpio);
-
-		if (on) {
-			if (GRER(gpio) | GPIO_bit(gpio))
-				PRER |= mask;
-			else
-				PRER &= ~mask;
+	if (gpio >= 0 && gpio < 128)
+		return gpio_set_wake(gpio, on);
 
-			if (GFER(gpio) | GPIO_bit(gpio))
-				PFER |= mask;
-			else
-				PFER &= ~mask;
-		}
-		goto set_pwer;
-	}
+	if (irq == IRQ_KEYPAD)
+		return keypad_set_wake(on);
 
 	switch (irq) {
 	case IRQ_RTCAlrm:
@@ -329,7 +309,6 @@ static int pxa27x_set_wake(unsigned int irq, unsigned int on)
 		return -EINVAL;
 	}
 
-set_pwer:
 	if (on)
 		PWER |= mask;
 	else