dm: gpio: hi6220: Add a hi6220 GPIO driver model driver.
This patch adds support for the GPIO perif found on hi6220
SoC.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
diff --git a/drivers/gpio/hi6220_gpio.c b/drivers/gpio/hi6220_gpio.c
new file mode 100644
index 0000000..3f41bff
--- /dev/null
+++ b/drivers/gpio/hi6220_gpio.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2015 Linaro
+ * Peter Griffin <peter.griffin@linaro.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <errno.h>
+
+static int hi6220_gpio_direction_input(struct udevice *dev, unsigned int gpio)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+ u8 data;
+
+ data = readb(bank->base + HI6220_GPIO_DIR);
+ data &= ~(1 << gpio);
+ writeb(data, bank->base + HI6220_GPIO_DIR);
+
+ return 0;
+}
+
+static int hi6220_gpio_set_value(struct udevice *dev, unsigned gpio,
+ int value)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+
+ writeb(!!value << gpio, bank->base + (BIT(gpio + 2)));
+ return 0;
+}
+
+static int hi6220_gpio_direction_output(struct udevice *dev, unsigned gpio,
+ int value)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+ u8 data;
+
+ data = readb(bank->base + HI6220_GPIO_DIR);
+ data |= 1 << gpio;
+ writeb(data, bank->base + HI6220_GPIO_DIR);
+
+ hi6220_gpio_set_value(dev, gpio, value);
+
+ return 0;
+}
+
+static int hi6220_gpio_get_value(struct udevice *dev, unsigned gpio)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+
+ return !!readb(bank->base + (BIT(gpio + 2)));
+}
+
+
+
+static const struct dm_gpio_ops gpio_hi6220_ops = {
+ .direction_input = hi6220_gpio_direction_input,
+ .direction_output = hi6220_gpio_direction_output,
+ .get_value = hi6220_gpio_get_value,
+ .set_value = hi6220_gpio_set_value,
+};
+
+static int hi6220_gpio_probe(struct udevice *dev)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+ struct hikey_gpio_platdata *plat = dev_get_platdata(dev);
+ struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+ char name[18], *str;
+
+ sprintf(name, "GPIO%d_", plat->bank_index);
+
+ str = strdup(name);
+ if (!str)
+ return -ENOMEM;
+
+ uc_priv->bank_name = str;
+ uc_priv->gpio_count = HI6220_GPIO_PER_BANK;
+
+ bank->base = (u8 *)plat->base;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(gpio_hi6220) = {
+ .name = "gpio_hi6220",
+ .id = UCLASS_GPIO,
+ .ops = &gpio_hi6220_ops,
+ .probe = hi6220_gpio_probe,
+ .priv_auto_alloc_size = sizeof(struct gpio_bank),
+};
+
+