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/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* This work is derived from the linux 2.6.27 kernel source
* To fetch, use the kernel repository
* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
* Use the v2.6.27 tag.
*
* Below is the original's header including its copyright
*
* linux/arch/arm/plat-omap/gpio.c
*
* Support functions for OMAP GPIO
*
* Copyright (C) 2003-2005 Nokia Corporation
* Written by Juha Yrjölä <juha.yrjola@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <common.h>
#include <mach/gpio.h>
#include <io.h>
#include <errno.h>
#ifdef CONFIG_ARCH_OMAP3
#define OMAP_GPIO_OE 0x0034
#define OMAP_GPIO_DATAIN 0x0038
#define OMAP_GPIO_DATAOUT 0x003c
#define OMAP_GPIO_CLEARDATAOUT 0x0090
#define OMAP_GPIO_SETDATAOUT 0x0094
static void __iomem *gpio_bank[] = {
(void *)0x48310000,
(void *)0x49050000,
(void *)0x49052000,
(void *)0x49054000,
(void *)0x49056000,
(void *)0x49058000,
};
#endif
#ifdef CONFIG_ARCH_OMAP4
#define OMAP_GPIO_OE 0x0134
#define OMAP_GPIO_DATAIN 0x0138
#define OMAP_GPIO_DATAOUT 0x013c
#define OMAP_GPIO_CLEARDATAOUT 0x0190
#define OMAP_GPIO_SETDATAOUT 0x0194
static void __iomem *gpio_bank[] = {
(void *)0x4a310000,
(void *)0x48055000,
(void *)0x48057000,
(void *)0x48059000,
(void *)0x4805b000,
(void *)0x4805d000,
};
#endif
static inline void __iomem *get_gpio_base(int gpio)
{
return gpio_bank[gpio >> 5];
}
static inline int get_gpio_index(int gpio)
{
return gpio & 0x1f;
}
static inline int gpio_valid(int gpio)
{
if (gpio < 0)
return -1;
if (gpio / 32 < ARRAY_SIZE(gpio_bank))
return 0;
return -1;
}
static int check_gpio(int gpio)
{
if (gpio_valid(gpio) < 0) {
printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
return -1;
}
return 0;
}
void gpio_set_value(unsigned gpio, int value)
{
void __iomem *reg;
u32 l = 0;
if (check_gpio(gpio) < 0)
return;
reg = get_gpio_base(gpio);
if (value)
reg += OMAP_GPIO_SETDATAOUT;
else
reg += OMAP_GPIO_CLEARDATAOUT;
l = 1 << get_gpio_index(gpio);
__raw_writel(l, reg);
}
int gpio_direction_input(unsigned gpio)
{
void __iomem *reg;
u32 val;
if (check_gpio(gpio) < 0)
return -EINVAL;
reg = get_gpio_base(gpio);
reg += OMAP_GPIO_OE;
val = __raw_readl(reg);
val |= 1 << get_gpio_index(gpio);
__raw_writel(val, reg);
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
void __iomem *reg;
u32 val;
if (check_gpio(gpio) < 0)
return -EINVAL;
reg = get_gpio_base(gpio);
gpio_set_value(gpio, value);
reg += OMAP_GPIO_OE;
val = __raw_readl(reg);
val &= ~(1 << get_gpio_index(gpio));
__raw_writel(val, reg);
return 0;
}
int gpio_get_value(unsigned gpio)
{
void __iomem *reg;
if (check_gpio(gpio) < 0)
return -EINVAL;
reg = get_gpio_base(gpio);
reg += OMAP_GPIO_DATAIN;
return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0;
}
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