mirror of
https://github.com/u-boot/u-boot.git
synced 2024-12-11 13:43:27 +08:00
151 lines
3.2 KiB
C
151 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2009
|
|
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
|
|
*
|
|
* Copyright (C) 2011
|
|
* Stefano Babic, DENX Software Engineering, <sbabic@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/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <errno.h>
|
|
|
|
enum mxc_gpio_direction {
|
|
MXC_GPIO_DIRECTION_IN,
|
|
MXC_GPIO_DIRECTION_OUT,
|
|
};
|
|
|
|
#define GPIO_TO_PORT(n) (n / 32)
|
|
|
|
/* GPIO port description */
|
|
static unsigned long gpio_ports[] = {
|
|
[0] = GPIO1_BASE_ADDR,
|
|
[1] = GPIO2_BASE_ADDR,
|
|
[2] = GPIO3_BASE_ADDR,
|
|
#if defined(CONFIG_MX25) || defined(CONFIG_MX51) || defined(CONFIG_MX53) || \
|
|
defined(CONFIG_MX6Q)
|
|
[3] = GPIO4_BASE_ADDR,
|
|
#endif
|
|
#if defined(CONFIG_MX53) || defined(CONFIG_MX6Q)
|
|
[4] = GPIO5_BASE_ADDR,
|
|
[5] = GPIO6_BASE_ADDR,
|
|
[6] = GPIO7_BASE_ADDR,
|
|
#endif
|
|
};
|
|
|
|
static int mxc_gpio_direction(unsigned int gpio,
|
|
enum mxc_gpio_direction direction)
|
|
{
|
|
unsigned int port = GPIO_TO_PORT(gpio);
|
|
struct gpio_regs *regs;
|
|
u32 l;
|
|
|
|
if (port >= ARRAY_SIZE(gpio_ports))
|
|
return -1;
|
|
|
|
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;
|
|
}
|
|
|
|
int gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
unsigned int port = GPIO_TO_PORT(gpio);
|
|
struct gpio_regs *regs;
|
|
u32 l;
|
|
|
|
if (port >= ARRAY_SIZE(gpio_ports))
|
|
return -1;
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_get_value(unsigned gpio)
|
|
{
|
|
unsigned int port = GPIO_TO_PORT(gpio);
|
|
struct gpio_regs *regs;
|
|
u32 val;
|
|
|
|
if (port >= ARRAY_SIZE(gpio_ports))
|
|
return -1;
|
|
|
|
gpio &= 0x1f;
|
|
|
|
regs = (struct gpio_regs *)gpio_ports[port];
|
|
|
|
val = (readl(®s->gpio_dr) >> gpio) & 0x01;
|
|
|
|
return val;
|
|
}
|
|
|
|
int gpio_request(unsigned gpio, const char *label)
|
|
{
|
|
unsigned int port = GPIO_TO_PORT(gpio);
|
|
if (port >= ARRAY_SIZE(gpio_ports))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
int gpio_free(unsigned gpio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int gpio_direction_input(unsigned gpio)
|
|
{
|
|
return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN);
|
|
}
|
|
|
|
int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
int ret = mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return gpio_set_value(gpio, value);
|
|
}
|