[ARM] pxa: add muxed gpio wakeup sources on pxa2xx architectures

PXA SoC have several GPIOs muxed on only one wakeup source.
Add support for these wakeup sources which were missing
in mfp core support.
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NEric Miao <eric.miao@marvell.com>

arch/arm/mach-pxa/mfp-pxa2xx.c

@@ -39,6 +39,7 @@ struct gpio_desc {
 	unsigned	can_wakeup	: 1;
 	unsigned	keypad_gpio	: 1;
 	unsigned int	mask; /* bit mask in PWER or PKWR */
+	unsigned int	mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
 	unsigned long	config;
 };
 
@@ -169,7 +170,7 @@ void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 int gpio_set_wake(unsigned int gpio, unsigned int on)
 {
 	struct gpio_desc *d;
-	unsigned long c;
+	unsigned long c, mux_taken;
 
 	if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 		return -EINVAL;
@@ -183,9 +184,13 @@ int gpio_set_wake(unsigned int gpio, unsigned int on)
 	if (d->keypad_gpio)
 		return -EINVAL;
 
+	mux_taken = (PWER & d->mux_mask) & (~d->mask);
+	if (on && mux_taken)
+		return -EBUSY;
+
 	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 		if (on) {
-			PWER |= d->mask;
+			PWER = (PWER & ~d->mux_mask) | d->mask;
 
 			if (c & MFP_LPM_EDGE_RISE)
 				PRER |= d->mask;
@@ -251,6 +256,22 @@ int keypad_set_wake(unsigned int on)
 	return 0;
 }
 
+#define PWER_WEMUX2_GPIO38	(1 << 16)
+#define PWER_WEMUX2_GPIO53	(2 << 16)
+#define PWER_WEMUX2_GPIO40	(3 << 16)
+#define PWER_WEMUX2_GPIO36	(4 << 16)
+#define PWER_WEMUX2_MASK	(7 << 16)
+#define PWER_WEMUX3_GPIO31	(1 << 19)
+#define PWER_WEMUX3_GPIO113	(2 << 19)
+#define PWER_WEMUX3_MASK	(3 << 19)
+
+#define INIT_GPIO_DESC_MUXED(mux, gpio)				\
+do {								\
+	gpio_desc[(gpio)].can_wakeup = 1;			\
+	gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;	\
+	gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;	\
+} while (0)
+
 static void __init pxa27x_mfp_init(void)
 {
 	int i, gpio;
@@ -286,6 +307,12 @@ static void __init pxa27x_mfp_init(void)
 	gpio_desc[35].can_wakeup = 1;
 	gpio_desc[35].mask = PWER_WE35;
 
+	INIT_GPIO_DESC_MUXED(WEMUX3, 31);
+	INIT_GPIO_DESC_MUXED(WEMUX3, 113);
+	INIT_GPIO_DESC_MUXED(WEMUX2, 38);
+	INIT_GPIO_DESC_MUXED(WEMUX2, 53);
+	INIT_GPIO_DESC_MUXED(WEMUX2, 40);
+	INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 	gpio_nr = 121;
 }
 #else