cortina_gpio.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Cortina-Access
*
* GPIO Driver for Cortina Access CAxxxx Line of SoCs
*/
#include <common.h>
#include <dm.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/compat.h>
#include <linux/compiler.h>
/* GPIO Register Map */
#define CORTINA_GPIO_CFG 0x00
#define CORTINA_GPIO_OUT 0x04
#define CORTINA_GPIO_IN 0x08
#define CORTINA_GPIO_LVL 0x0C
#define CORTINA_GPIO_EDGE 0x10
#define CORTINA_GPIO_BOTHEDGE 0x14
#define CORTINA_GPIO_IE 0x18
#define CORTINA_GPIO_INT 0x1C
#define CORTINA_GPIO_STAT 0x20
struct cortina_gpio_bank {
void __iomem *base;
};
#ifdef CONFIG_DM_GPIO
static int ca_gpio_direction_input(struct udevice *dev, unsigned int offset)
{
struct cortina_gpio_bank *priv = dev_get_priv(dev);
setbits_32(priv->base, BIT(offset));
return 0;
}
static int
ca_gpio_direction_output(struct udevice *dev, unsigned int offset, int value)
{
struct cortina_gpio_bank *priv = dev_get_priv(dev);
clrbits_32(priv->base, BIT(offset));
return 0;
}
static int ca_gpio_get_value(struct udevice *dev, unsigned int offset)
{
struct cortina_gpio_bank *priv = dev_get_priv(dev);
return readl(priv->base + CORTINA_GPIO_IN) & BIT(offset);
}
static int ca_gpio_set_value(struct udevice *dev, unsigned int offset,
int value)
{
struct cortina_gpio_bank *priv = dev_get_priv(dev);
setbits_32(priv->base + CORTINA_GPIO_OUT, BIT(offset));
return 0;
}
static int ca_gpio_get_function(struct udevice *dev, unsigned int offset)
{
struct cortina_gpio_bank *priv = dev_get_priv(dev);
if (readl(priv->base) & BIT(offset))
return GPIOF_INPUT;
else
return GPIOF_OUTPUT;
}
static const struct dm_gpio_ops gpio_cortina_ops = {
.direction_input = ca_gpio_direction_input,
.direction_output = ca_gpio_direction_output,
.get_value = ca_gpio_get_value,
.set_value = ca_gpio_set_value,
.get_function = ca_gpio_get_function,
};
static int ca_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct cortina_gpio_bank *priv = dev_get_priv(dev);
priv->base = dev_remap_addr_index(dev, 0);
if (!priv->base)
return -EINVAL;
uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
uc_priv->bank_name = dev->name;
debug("Done Cortina GPIO init\n");
return 0;
}
static const struct udevice_id ca_gpio_ids[] = {
{.compatible = "cortina,ca-gpio"},
{}
};
U_BOOT_DRIVER(cortina_gpio) = {
.name = "cortina-gpio",
.id = UCLASS_GPIO,
.ops = &gpio_cortina_ops,
.probe = ca_gpio_probe,
.priv_auto_alloc_size = sizeof(struct cortina_gpio_bank),
.of_match = ca_gpio_ids,
};
#endif /* CONFIG_DM_GPIO */