a8ead3b9dd
mach/gpio.h is for the gpio API, so move unrelated stuff away. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
125 lines
3 KiB
C
125 lines
3 KiB
C
/*
|
|
* 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);
|
|
}
|
|
|
|
}
|