1 files changed, 78 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/gpio/bcm2835_gpio.c b/qemu/roms/u-boot/drivers/gpio/bcm2835_gpio.c
new file mode 100644
index 000000000..97b513711
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/gpio/bcm2835_gpio.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2012 Vikram Narayananan
+ * <vikram186@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+
+inline int gpio_is_valid(unsigned gpio)
+{
+	return (gpio < BCM2835_GPIO_COUNT);
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	return !gpio_is_valid(gpio);
+}
+
+int gpio_free(unsigned gpio)
+{
+	return 0;
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+	struct bcm2835_gpio_regs *reg =
+		(struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
+	unsigned val;
+
+	val = readl(&reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+	val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
+	val |= (BCM2835_GPIO_INPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
+	writel(val, &reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+
+	return 0;
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	struct bcm2835_gpio_regs *reg =
+		(struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
+	unsigned val;
+
+	gpio_set_value(gpio, value);
+
+	val = readl(&reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+	val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
+	val |= (BCM2835_GPIO_OUTPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
+	writel(val, &reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+
+	return 0;
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	struct bcm2835_gpio_regs *reg =
+		(struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
+	unsigned val;
+
+	val = readl(&reg->gplev[BCM2835_GPIO_COMMON_BANK(gpio)]);
+
+	return (val >> BCM2835_GPIO_COMMON_SHIFT(gpio)) & 0x1;
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+	struct bcm2835_gpio_regs *reg =
+		(struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
+	u32 *output_reg = value ? reg->gpset : reg->gpclr;
+
+	writel(1 << BCM2835_GPIO_COMMON_SHIFT(gpio),
+				&output_reg[BCM2835_GPIO_COMMON_BANK(gpio)]);
+
+	return 0;
+}