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/*
* Copyright (C) 2009
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
#include <common.h>
#include <asm/arch/imx-regs.h>
#include <asm/io.h>
#include <mxc_gpio.h>
#include <errno.h>
/* GPIO port description */
static unsigned long gpio_ports[] = {
[0] = GPIO1_BASE_ADDR,
[1] = GPIO2_BASE_ADDR,
[2] = GPIO3_BASE_ADDR,
#if defined(CONFIG_MX51) || defined(CONFIG_MX53)
[3] = GPIO4_BASE_ADDR,
#endif
#if defined(CONFIG_MX53)
[4] = GPIO5_BASE_ADDR,
[5] = GPIO6_BASE_ADDR,
[6] = GPIO7_BASE_ADDR,
#endif
};
int mxc_gpio_direction(unsigned int gpio, enum mxc_gpio_direction direction)
{
unsigned int port = gpio >> 5;
struct gpio_regs *regs;
u32 l;
if (port >= ARRAY_SIZE(gpio_ports))
return -EINVAL;
gpio &= 0x1f;
regs = (struct gpio_regs *)gpio_ports[port];
l = readl(®s->gpio_dir);
switch (direction) {
case MXC_GPIO_DIRECTION_OUT:
l |= 1 << gpio;
break;
case MXC_GPIO_DIRECTION_IN:
l &= ~(1 << gpio);
}
writel(l, ®s->gpio_dir);
return 0;
}
void mxc_gpio_set(unsigned int gpio, unsigned int value)
{
unsigned int port = gpio >> 5;
struct gpio_regs *regs;
u32 l;
if (port >= ARRAY_SIZE(gpio_ports))
return;
gpio &= 0x1f;
regs = (struct gpio_regs *)gpio_ports[port];
l = readl(®s->gpio_dr);
if (value)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
writel(l, ®s->gpio_dr);
}
int mxc_gpio_get(unsigned int gpio)
{
unsigned int port = gpio >> 5;
struct gpio_regs *regs;
u32 l;
if (port >= ARRAY_SIZE(gpio_ports))
return -EINVAL;
gpio &= 0x1f;
regs = (struct gpio_regs *)gpio_ports[port];
l = (readl(®s->gpio_dr) >> gpio) & 0x01;
return l;
}
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