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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
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* Copyright (C) 2012
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* Gabriel Huau <contact@huau-gabriel.fr>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/arch/s3c2440.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#define GPIO_INPUT 0x0
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#define GPIO_OUTPUT 0x1
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/* 0x4 means that we want DAT and not CON register */
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#define GPIO_PORT(x) ((((x) >> 5) & 0x3) + 0x4)
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#define GPIO_BIT(x) ((x) & 0x3f)
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/*
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* It's how we calculate the full port address
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* We have to get the number of the port + 1 (Port A is at 0x56000001 ...)
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* We move it at the second digit, and finally we add 0x4 because we want
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* to modify GPIO DAT and not CON
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*/
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#define GPIO_FULLPORT(x) (S3C24X0_GPIO_BASE | ((GPIO_PORT(gpio) + 1) << 1))
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int gpio_set_value(unsigned gpio, int value)
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{
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unsigned l = readl(GPIO_FULLPORT(gpio));
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unsigned bit;
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unsigned port = GPIO_FULLPORT(gpio);
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/*
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* All GPIO Port have a configuration on
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* 2 bits excepted the first GPIO (A) which
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* have only 1 bit of configuration.
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*/
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if (!GPIO_PORT(gpio))
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bit = (0x1 << GPIO_BIT(gpio));
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else
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bit = (0x3 << GPIO_BIT(gpio));
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if (value)
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l |= bit;
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else
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l &= ~bit;
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return writel(l, port);
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}
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int gpio_get_value(unsigned gpio)
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{
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unsigned l = readl(GPIO_FULLPORT(gpio));
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if (GPIO_PORT(gpio) == 0) /* PORT A */
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return (l >> GPIO_BIT(gpio)) & 0x1;
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return (l >> GPIO_BIT(gpio)) & 0x3;
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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return 0;
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}
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int gpio_free(unsigned gpio)
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{
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return 0;
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}
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int gpio_direction_input(unsigned gpio)
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{
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return writel(GPIO_INPUT << GPIO_BIT(gpio), GPIO_FULLPORT(gpio));
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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writel(GPIO_OUTPUT << GPIO_BIT(gpio), GPIO_FULLPORT(gpio));
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return gpio_set_value(gpio, value);
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}
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