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hi6220_gpio.c 1.99 KiB
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  • /*
     * 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),
    };