1 files changed, 83 insertions, 0 deletions
diff --git a/arch/arm/mach-nomadik/gpio.c b/arch/arm/mach-nomadik/gpio.c
new file mode 100644
index 0000000000..eff5b2b75e
--- /dev/null
+++ b/arch/arm/mach-nomadik/gpio.c
@@ -0,0 +1,83 @@
+/*
+ * (C) Copyright 2009 Alessandro Rubini
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/gpio.h>
+
+static unsigned long gpio_base[4] = {
+	NOMADIK_GPIO0_BASE,
+	NOMADIK_GPIO1_BASE,
+	NOMADIK_GPIO2_BASE,
+	NOMADIK_GPIO3_BASE
+};
+
+enum gpio_registers {
+	GPIO_DAT =	0x00,		/* data register */
+	GPIO_DATS =	0x04,		/* data set */
+	GPIO_DATC =	0x08,		/* data clear */
+	GPIO_PDIS =	0x0c,		/* pull disable */
+	GPIO_DIR =	0x10,		/* direction */
+	GPIO_DIRS =	0x14,		/* direction set */
+	GPIO_DIRC =	0x18,		/* direction clear */
+	GPIO_AFSLA =	0x20,		/* alternate function select A */
+	GPIO_AFSLB =	0x24,		/* alternate function select B */
+};
+
+static inline unsigned long gpio_to_base(int gpio)
+{
+	return gpio_base[gpio / 32];
+}
+
+static inline u32 gpio_to_bit(int gpio)
+{
+	return 1 << (gpio & 0x1f);
+}
+
+void nmk_gpio_af(int gpio, int alternate_function)
+{
+	unsigned long base = gpio_to_base(gpio);
+	u32 bit = gpio_to_bit(gpio);
+	u32 afunc, bfunc;
+
+	/* alternate function is 0..3, with one bit per register */
+	afunc = readl(base + GPIO_AFSLA) & ~bit;
+	bfunc = readl(base + GPIO_AFSLB) & ~bit;
+	if (alternate_function & 1) afunc |= bit;
+	if (alternate_function & 2) bfunc |= bit;
+	writel(afunc, base + GPIO_AFSLA);
+	writel(bfunc, base + GPIO_AFSLB);
+}
+
+void nmk_gpio_dir(int gpio, int dir)
+{
+	unsigned long base = gpio_to_base(gpio);
+	u32 bit = gpio_to_bit(gpio);
+
+	if (dir)
+		writel(bit, base + GPIO_DIRS);
+	else
+		writel(bit, base + GPIO_DIRC);
+}
+
+void nmk_gpio_set(int gpio, int val)
+{
+	unsigned long base = gpio_to_base(gpio);
+	u32 bit = gpio_to_bit(gpio);
+
+	if (val)
+		writel(bit, base + GPIO_DATS);
+	else
+		writel(bit, base + GPIO_DATC);
+}
+
+int nmk_gpio_get(int gpio)
+{
+	unsigned long base = gpio_to_base(gpio);
+	u32 bit = gpio_to_bit(gpio);
+
+	return readl(base + GPIO_DAT) & bit;
+}