avr32: Add GPIO manipulation functions

Adds GPIO manipulation functions for AVR32 AP7 platform.

Signed-off-by: Peter Ma <pma@mediamatech.com>
[haavard.skinnemoen@atmel.com: coding style fixup, slight simplification]
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

cpu/at32ap/pio.c

@@ -58,3 +58,59 @@ void gpio_select_periph_B(unsigned int pin, int use_pullup)
 	else
 		pio2_writel(base, PUDR, mask);
 }
+
+void gpio_select_pio(unsigned int pin, unsigned long gpiof_flags)
+{
+	void *base = gpio_pin_to_addr(pin);
+	uint32_t mask = 1 << (pin & 0x1f);
+
+	if (!base)
+		panic("Invalid GPIO pin %u\n", pin);
+
+	if (gpiof_flags & GPIOF_OUTPUT) {
+		if (gpiof_flags & GPIOF_MULTIDRV)
+			pio2_writel(base, MDER, mask);
+		else
+			pio2_writel(base, MDDR, mask);
+		pio2_writel(base, PUDR, mask);
+		pio2_writel(base, OER, mask);
+	} else {
+		if (gpiof_flags & GPIOF_PULLUP)
+			pio2_writel(base, PUER, mask);
+		else
+			pio2_writel(base, PUDR, mask);
+		if (gpiof_flags & GPIOF_DEGLITCH)
+			pio2_writel(base, IFER, mask);
+		else
+			pio2_writel(base, IFDR, mask);
+		pio2_writel(base, ODR, mask);
+	}
+
+	pio2_writel(base, PER, mask);
+}
+
+void gpio_set_value(unsigned int pin, int value)
+{
+	void *base = gpio_pin_to_addr(pin);
+	uint32_t mask = 1 << (pin & 0x1f);
+
+	if (!base)
+		panic("Invalid GPIO pin %u\n", pin);
+
+	if (value)
+		pio2_writel(base, SODR, mask);
+	else
+		pio2_writel(base, CODR, mask);
+}
+
+int gpio_get_value(unsigned int pin)
+{
+	void *base = gpio_pin_to_addr(pin);
+	int value;
+
+	if (!base)
+		panic("Invalid GPIO pin %u\n", pin);
+
+	value = pio2_readl(base, PDSR);
+	return (value >> (pin & 0x1f)) & 1;
+}

include/asm-avr32/arch-at32ap700x/gpio.h

@@ -180,6 +180,11 @@
 #define GPIO_PIN_PE25	(GPIO_PIOE_BASE + 25)
 #define GPIO_PIN_PE26	(GPIO_PIOE_BASE + 26)
 
+#define GPIOF_PULLUP	0x00000001	/* (not-OUT) Enable pull-up */
+#define GPIOF_OUTPUT	0x00000002	/* (OUT) Enable output driver */
+#define GPIOF_DEGLITCH	0x00000004	/* (IN) Filter glitches */
+#define GPIOF_MULTIDRV	0x00000008	/* Enable multidriver option */
+
 static inline void *gpio_pin_to_addr(unsigned int pin)
 {
 	switch (pin >> 5) {
@@ -200,6 +205,9 @@ static inline void *gpio_pin_to_addr(unsigned int pin)
 
 void gpio_select_periph_A(unsigned int pin, int use_pullup);
 void gpio_select_periph_B(unsigned int pin, int use_pullup);
+void gpio_select_pio(unsigned int pin, unsigned long gpiof_flags);
+void gpio_set_value(unsigned int pin, int value);
+int gpio_get_value(unsigned int pin);
 
 void gpio_enable_ebi(void);