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s3c2440_gpio.c 1.68 KiB
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  • /*
     * Copyright (C) 2012
     * Gabriel Huau <contact@huau-gabriel.fr>
     *
    
     * SPDX-License-Identifier:	GPL-2.0+
    
     */
    #include <common.h>
    #include <asm/arch/s3c2440.h>
    #include <asm/gpio.h>
    #include <asm/io.h>
    
    #define GPIO_INPUT  0x0
    #define GPIO_OUTPUT 0x1
    
    /* 0x4 means that we want DAT and not CON register */
    #define GPIO_PORT(x)	((((x) >> 5) & 0x3) + 0x4)
    #define GPIO_BIT(x)		((x) & 0x3f)
    
    /*
     * It's how we calculate the full port address
     * We have to get the number of the port + 1 (Port A is at 0x56000001 ...)
     * We move it at the second digit, and finally we add 0x4 because we want
     * to modify GPIO DAT and not CON
     */
    #define GPIO_FULLPORT(x) (S3C24X0_GPIO_BASE | ((GPIO_PORT(gpio) + 1) << 1))
    
    int gpio_set_value(unsigned gpio, int value)
    {
    	unsigned l = readl(GPIO_FULLPORT(gpio));
    	unsigned bit;
    	unsigned port = GPIO_FULLPORT(gpio);
    
    	/*
    	 * All GPIO Port have a configuration on
    	 * 2 bits excepted the first GPIO (A) which
    	 * have only 1 bit of configuration.
    	 */
    	if (!GPIO_PORT(gpio))
    		bit = (0x1 << GPIO_BIT(gpio));
    	else
    		bit = (0x3 << GPIO_BIT(gpio));
    
    	if (value)
    		l |= bit;
    	else
    		l &= ~bit;
    
    
    	return writel(l, port);
    
    }
    
    int gpio_get_value(unsigned gpio)
    {
    	unsigned l = readl(GPIO_FULLPORT(gpio));
    
    	if (GPIO_PORT(gpio) == 0) /* PORT A */
    		return (l >> GPIO_BIT(gpio)) & 0x1;
    	return (l >> GPIO_BIT(gpio)) & 0x3;
    }
    
    int gpio_request(unsigned gpio, const char *label)
    {
    	return 0;
    }
    
    int gpio_free(unsigned gpio)
    {
    	return 0;
    }
    
    int gpio_direction_input(unsigned gpio)
    {
    
    	return writel(GPIO_INPUT << GPIO_BIT(gpio), GPIO_FULLPORT(gpio));
    
    }
    
    int gpio_direction_output(unsigned gpio, int value)
    {
    
    	writel(GPIO_OUTPUT << GPIO_BIT(gpio), GPIO_FULLPORT(gpio));
    
    	return gpio_set_value(gpio, value);
    }