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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2022 Nuvoton Technology Corp.
*/
#include <common.h>
#include <dm.h>
#include <asm/gpio.h>
#include <linux/io.h>
#define NPCM_GPIOS_PER_BANK 32
/* Register offsets */
#define GPIO_DIN 0x4 /* RO - Data In */
#define GPIO_DOUT 0xC /* RW - Data Out */
#define GPIO_OE 0x10 /* RW - Output Enable */
#define GPIO_IEM 0x58 /* RW - Input Enable Mask */
#define GPIO_OES 0x70 /* WO - Output Enable Register Set */
#define GPIO_OEC 0x74 /* WO - Output Enable Register Clear */
struct npcm_gpio_priv {
void __iomem *base;
};
static int npcm_gpio_direction_input(struct udevice *dev, unsigned int offset)
{
struct npcm_gpio_priv *priv = dev_get_priv(dev);
writel(BIT(offset), priv->base + GPIO_OEC);
setbits_le32(priv->base + GPIO_IEM, BIT(offset));
return 0;
}
static int npcm_gpio_direction_output(struct udevice *dev, unsigned int offset,
int value)
{
struct npcm_gpio_priv *priv = dev_get_priv(dev);
if (value)
setbits_le32(priv->base + GPIO_DOUT, BIT(offset));
else
clrbits_le32(priv->base + GPIO_DOUT, BIT(offset));
clrbits_le32(priv->base + GPIO_IEM, BIT(offset));
writel(BIT(offset), priv->base + GPIO_OES);
return 0;
}
static int npcm_gpio_get_value(struct udevice *dev, unsigned int offset)
{
struct npcm_gpio_priv *priv = dev_get_priv(dev);
if (readl(priv->base + GPIO_IEM) & BIT(offset))
return !!(readl(priv->base + GPIO_DIN) & BIT(offset));
if (readl(priv->base + GPIO_OE) & BIT(offset))
return !!(readl(priv->base + GPIO_DOUT) & BIT(offset));
return -EINVAL;
}
static int npcm_gpio_set_value(struct udevice *dev, unsigned int offset,
int value)
{
struct npcm_gpio_priv *priv = dev_get_priv(dev);
if (value)
setbits_le32(priv->base + GPIO_DOUT, BIT(offset));
else
clrbits_le32(priv->base + GPIO_DOUT, BIT(offset));
return 0;
}
static int npcm_gpio_get_function(struct udevice *dev, unsigned int offset)
{
struct npcm_gpio_priv *priv = dev_get_priv(dev);
if (readl(priv->base + GPIO_IEM) & BIT(offset))
return GPIOF_INPUT;
if (readl(priv->base + GPIO_OE) & BIT(offset))
return GPIOF_OUTPUT;
return GPIOF_FUNC;
}
static const struct dm_gpio_ops npcm_gpio_ops = {
.direction_input = npcm_gpio_direction_input,
.direction_output = npcm_gpio_direction_output,
.get_value = npcm_gpio_get_value,
.set_value = npcm_gpio_set_value,
.get_function = npcm_gpio_get_function,
};
static int npcm_gpio_probe(struct udevice *dev)
{
struct npcm_gpio_priv *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
priv->base = dev_read_addr_ptr(dev);
uc_priv->gpio_count = NPCM_GPIOS_PER_BANK;
uc_priv->bank_name = dev->name;
return 0;
}
static const struct udevice_id npcm_gpio_match[] = {
{ .compatible = "nuvoton,npcm845-gpio" },
{ .compatible = "nuvoton,npcm750-gpio" },
{ }
};
U_BOOT_DRIVER(npcm_gpio) = {
.name = "npcm_gpio",
.id = UCLASS_GPIO,
.of_match = npcm_gpio_match,
.probe = npcm_gpio_probe,
.priv_auto = sizeof(struct npcm_gpio_priv),
.ops = &npcm_gpio_ops,
};
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