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/*
* Copyright (C) 2012 Alexey Galakhov
* Copyright (C) 2012 Juergen Beisert, Pengutronix
*
* This codes bases partially on code from the Linux kernel:
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <errno.h>
#include <io.h>
#include <gpio.h>
#include <mach/iomux.h>
#include <mach/s3c-iomap.h>
#define S3C_GPACON (S3C_GPIO_BASE)
#define S3C_GPADAT (S3C_GPIO_BASE + 0x04)
#define S3C_GPAPUD (S3C_GPIO_BASE + 0x08)
static inline unsigned group_offset(unsigned group)
{
return group * 0x20;
}
void gpio_set_value(unsigned gpio, int value)
{
unsigned group = GET_GROUP(gpio);
unsigned bit = GET_BIT(gpio);
unsigned offset = group_offset(group);
uint32_t reg;
reg = readl(S3C_GPADAT + offset);
reg &= ~(1 << bit);
reg |= (!!value) << bit;
writel(reg, S3C_GPADAT + offset);
}
int gpio_get_value(unsigned gpio)
{
unsigned group = GET_GROUP(gpio);
unsigned bit = GET_BIT(gpio);
unsigned offset = group_offset(group);
uint32_t reg;
/* value */
reg = readl(S3C_GPADAT + offset);
return !!(reg & (1 << bit));
}
int gpio_direction_input(unsigned gpio)
{
unsigned group = GET_GROUP(gpio);
unsigned bit = GET_BIT(gpio);
unsigned offset = group_offset(group);
uint32_t reg;
bit <<= 2;
reg = readl(S3C_GPACON + offset) & ~(0xf << bit);
writel(reg, S3C_GPACON + offset);
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
unsigned group = GET_GROUP(gpio);
unsigned bit = GET_BIT(gpio);
unsigned offset = group_offset(group);
uint32_t reg;
gpio_set_value(gpio, value);
bit <<= 2;
reg = readl(S3C_GPACON + offset) & ~(0xf << bit);
reg |= 0x1 << bit;
writel(reg, S3C_GPACON + offset);
return 0;
}
/* 'gpio_mode' must be one of the 'GP?_*' macros */
void s3c_gpio_mode(unsigned gpio_mode)
{
unsigned group = GET_GROUP(gpio_mode);
unsigned bit = GET_BIT(gpio_mode);
unsigned func = GET_FUNC(gpio_mode);
unsigned offset = group_offset(group);
unsigned reg;
bit <<= 1;
if (PUD_PRESENT(gpio_mode)) {
reg = readl(S3C_GPAPUD + offset);
reg &= ~(PUD_MASK << bit);
reg |= GET_PUD(gpio_mode) << bit;
writel(reg, S3C_GPAPUD + offset);
}
bit <<= 1;
reg = readl(S3C_GPACON + offset) & ~(0xf << bit);
writel(reg | (func << bit), S3C_GPACON + offset);
if (func == 1) { /* output? if yes, also set the initial value */
reg = readl(S3C_GPADAT + offset) & ~(1 << (bit >> 2));
reg |= GET_GPIOVAL(gpio_mode) << (bit >> 2);
writel(reg, S3C_GPADAT + offset);
}
}
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