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>

arch/arm/include/asm/arch-hi6220/gpio.h

+/*
+ * Copyright (C) 2015 Linaro
+ * Peter Griffin <peter.griffin@linaro.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _HI6220_GPIO_H_
+#define _HI6220_GPIO_H_
+
+#define HI6220_GPIO_BASE(bank)	(((bank < 4) ? 0xf8011000 : \
+				0xf7020000 - 0x4000) + (0x1000 * bank))
+
+#define BIT(x)			(1 << (x))
+
+#define HI6220_GPIO_PER_BANK	8
+#define HI6220_GPIO_DIR		0x400
+
+struct gpio_bank {
+	u8 *base;	/* address of registers in physical memory */
+};
+
+/* Information about a GPIO bank */
+struct hikey_gpio_platdata {
+	int bank_index;
+	unsigned int base;     /* address of registers in physical memory */
+};
+
+#endif /* _HI6220_GPIO_H_ */

drivers/gpio/Makefile

@@ -42,3 +42,5 @@ obj-$(CONFIG_LPC32XX_GPIO)	+= lpc32xx_gpio.o
 obj-$(CONFIG_STM32_GPIO)	+= stm32_gpio.o
 obj-$(CONFIG_ZYNQ_GPIO)		+= zynq_gpio.o
 obj-$(CONFIG_VYBRID_GPIO)	+= vybrid_gpio.o
+obj-$(CONFIG_HIKEY_GPIO)	+= hi6220_gpio.o
+

drivers/gpio/hi6220_gpio.c

+/*
+ * 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),
+};
+
+