rpi3: Add GPIO driver
This commit adds GPIO driver for RaspberryPi3. The GPIO driver for RPi3
also provides the way to do pinmux selections.
Signed-off-by: Ying-Chun Liu (PaulLiu) <paulliu@debian.org>
diff --git a/include/drivers/rpi3/gpio/rpi3_gpio.h b/include/drivers/rpi3/gpio/rpi3_gpio.h
new file mode 100644
index 0000000..159a2e0
--- /dev/null
+++ b/include/drivers/rpi3/gpio/rpi3_gpio.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2019, Linaro Limited
+ * Copyright (c) 2019, Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef RPI3_GPIO_H
+#define RPI3_GPIO_H
+
+#include <stdint.h>
+#include <drivers/gpio.h>
+
+struct rpi3_gpio_params {
+ uintptr_t reg_base;
+};
+
+void rpi3_gpio_init(struct rpi3_gpio_params *params);
+int rpi3_gpio_get_select(int gpio);
+void rpi3_gpio_set_select(int gpio, int fsel);
+
+#define RPI3_GPIO_GPFSEL(n) ((n) * U(0x04))
+#define RPI3_GPIO_GPSET(n) (((n) * U(0x04)) + U(0x1C))
+#define RPI3_GPIO_GPCLR(n) (((n) * U(0x04)) + U(0x28))
+#define RPI3_GPIO_GPLEV(n) (((n) * U(0x04)) + U(0x34))
+#define RPI3_GPIO_GPPUD U(0x94)
+#define RPI3_GPIO_GPPUDCLK(n) (((n) * U(0x04)) + U(0x98))
+
+#define RPI3_GPIO_FUNC_INPUT U(0)
+#define RPI3_GPIO_FUNC_OUTPUT U(1)
+#define RPI3_GPIO_FUNC_ALT0 U(4)
+#define RPI3_GPIO_FUNC_ALT1 U(5)
+#define RPI3_GPIO_FUNC_ALT2 U(6)
+#define RPI3_GPIO_FUNC_ALT3 U(7)
+#define RPI3_GPIO_FUNC_ALT4 U(3)
+#define RPI3_GPIO_FUNC_ALT5 U(2)
+
+#endif /* RPI3_GPIO_H */