bcm6345_gpio.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/arch/mips/bcm63xx/gpio.c:
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
* Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
struct bcm6345_gpio_priv {
void __iomem *reg_dirout;
void __iomem *reg_data;
};
static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
return !!(readl(priv->reg_data) & BIT(offset));
}
static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
if (value)
setbits_32(priv->reg_data, BIT(offset));
else
clrbits_32(priv->reg_data, BIT(offset));
return 0;
}
static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset,
bool input)
{
if (input)
clrbits_32(dirout, BIT(offset));
else
setbits_32(dirout, BIT(offset));
return 0;
}
static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1);
}
static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
bcm6345_gpio_set_value(dev, offset, value);
return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0);
}
static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
if (readl(priv->reg_dirout) & BIT(offset))
return GPIOF_OUTPUT;
else
return GPIOF_INPUT;
}
static const struct dm_gpio_ops bcm6345_gpio_ops = {
.direction_input = bcm6345_gpio_direction_input,
.direction_output = bcm6345_gpio_direction_output,
.get_value = bcm6345_gpio_get_value,
.set_value = bcm6345_gpio_set_value,
.get_function = bcm6345_gpio_get_function,
};
static int bcm6345_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
priv->reg_dirout = dev_remap_addr_index(dev, 0);
if (!priv->reg_dirout)
return -EINVAL;
priv->reg_data = dev_remap_addr_index(dev, 1);
if (!priv->reg_data)
return -EINVAL;
uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
uc_priv->bank_name = dev->name;
return 0;
}
static const struct udevice_id bcm6345_gpio_ids[] = {
{ .compatible = "brcm,bcm6345-gpio" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(bcm6345_gpio) = {
.name = "bcm6345-gpio",
.id = UCLASS_GPIO,
.of_match = bcm6345_gpio_ids,
.ops = &bcm6345_gpio_ops,
.priv_auto_alloc_size = sizeof(struct bcm6345_gpio_priv),
.probe = bcm6345_gpio_probe,
};