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/*
* arch/arm/plat-orion/gpio.c
*
* Marvell Orion SoC GPIO handling.
*
Prafulla Wadaskar
committed
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
/*
* Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver.
* Removed orion_gpiochip struct and kernel level irq handling.
*
* Dieter Kiermaier dk-arm-linux@gmx.de
*/
#include <common.h>
#include <asm/bitops.h>
#include <asm/io.h>
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#include <asm/arch/kirkwood.h>
#include <asm/arch/gpio.h>
static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];
static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)];
void __set_direction(unsigned pin, int input)
{
u32 u;
u = readl(GPIO_IO_CONF(pin));
if (input)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_IO_CONF(pin));
u = readl(GPIO_IO_CONF(pin));
}
void __set_level(unsigned pin, int high)
{
u32 u;
u = readl(GPIO_OUT(pin));
if (high)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_OUT(pin));
}
void __set_blinking(unsigned pin, int blink)
{
u32 u;
u = readl(GPIO_BLINK_EN(pin));
if (blink)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_BLINK_EN(pin));
}
int kw_gpio_is_valid(unsigned pin, int mode)
{
if (pin < GPIO_MAX) {
if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input))
goto err_out;
if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output))
goto err_out;
return 0;
}
err_out:
printf("%s: invalid GPIO %d\n", __func__, pin);
return 1;
}
void kw_gpio_set_valid(unsigned pin, int mode)
{
if (mode == 1)
mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
if (mode & GPIO_INPUT_OK)
__set_bit(pin, gpio_valid_input);
else
__clear_bit(pin, gpio_valid_input);
if (mode & GPIO_OUTPUT_OK)
__set_bit(pin, gpio_valid_output);
else
__clear_bit(pin, gpio_valid_output);
}
/*
* GENERIC_GPIO primitives.
*/
int kw_gpio_direction_input(unsigned pin)
{
if (kw_gpio_is_valid(pin, GPIO_INPUT_OK) != 0)
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return 1;
/* Configure GPIO direction. */
__set_direction(pin, 1);
return 0;
}
int kw_gpio_direction_output(unsigned pin, int value)
{
if (kw_gpio_is_valid(pin, GPIO_OUTPUT_OK) != 0)
{
printf("%s: invalid GPIO %d\n", __func__, pin);
return 1;
}
__set_blinking(pin, 0);
/* Configure GPIO output value. */
__set_level(pin, value);
/* Configure GPIO direction. */
__set_direction(pin, 0);
return 0;
}
int kw_gpio_get_value(unsigned pin)
{
int val;
if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)))
val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin));
else
val = readl(GPIO_OUT(pin));
return (val >> (pin & 31)) & 1;
}
void kw_gpio_set_value(unsigned pin, int value)
{
/* Configure GPIO output value. */
__set_level(pin, value);
}
void kw_gpio_set_blink(unsigned pin, int blink)
{
/* Set output value to zero. */
__set_level(pin, 0);
/* Set blinking. */
__set_blinking(pin, blink);
}