mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 05:42:58 +00:00
c0c374024d
In current gpio_set_value() implementation, it always sets the gpio control bit no matter the value argument is 0 or 1. Thus the GPIOs never set to low. This patch fixes this bug. The address bus is used as a mask on read/write operations, so that independent software drivers can set their GPIO bits without affecting any other pins in a single write operation. Thus we don't need a read-modify-write to update the register. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Stefan Roese <sr@denx.de> Reviewed-by: Vipin Kumar <vipin.kumar@st.com> Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
89 lines
1.5 KiB
C
89 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2012 Stefan Roese <sr@denx.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* Driver for SPEAr600 GPIO controller
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <errno.h>
|
|
|
|
static int gpio_direction(unsigned gpio,
|
|
enum gpio_direction direction)
|
|
{
|
|
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
|
u32 val;
|
|
|
|
val = readl(®s->gpiodir);
|
|
|
|
if (direction == GPIO_DIRECTION_OUT)
|
|
val |= 1 << gpio;
|
|
else
|
|
val &= ~(1 << gpio);
|
|
|
|
writel(val, ®s->gpiodir);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
|
|
|
if (value)
|
|
writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
|
else
|
|
writel(0, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_get_value(unsigned gpio)
|
|
{
|
|
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
|
u32 val;
|
|
|
|
val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
|
|
|
return !!val;
|
|
}
|
|
|
|
int gpio_request(unsigned gpio, const char *label)
|
|
{
|
|
if (gpio >= SPEAR_GPIO_COUNT)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_free(unsigned gpio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void gpio_toggle_value(unsigned gpio)
|
|
{
|
|
gpio_set_value(gpio, !gpio_get_value(gpio));
|
|
}
|
|
|
|
int gpio_direction_input(unsigned gpio)
|
|
{
|
|
return gpio_direction(gpio, GPIO_DIRECTION_IN);
|
|
}
|
|
|
|
int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
gpio_set_value(gpio, value);
|
|
return 0;
|
|
}
|