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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2022 Starfive, Inc.
* Author: yanhong <yanhong.wang@starfivetech.com>
*
*/
#include <common.h>
#include <dm.h>
#include <asm/arch/gpio.h>
#include <asm/io.h>
#include <errno.h>
#include <asm/gpio.h>
#include <linux/bitops.h>
static int starfive_gpio_probe(struct udevice *dev)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
char name[18], *str;
sprintf(name, "gpio@%4lx_", (uintptr_t)plat->base);
str = strdup(name);
if (!str)
return -ENOMEM;
uc_priv->bank_name = str;
/*
* Use the gpio count mentioned in device tree,
* if not specified in dt, set NR_GPIOS as default
*/
uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", NR_GPIOS);
return 0;
}
static int starfive_gpio_direction_input(struct udevice *dev, u32 offset)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (offset > uc_priv->gpio_count)
return -EINVAL;
/* Configure gpio direction as input */
clrsetbits_le32(plat->base + GPIO_OFFSET(offset),
GPIO_DOEN_MASK << GPIO_SHIFT(offset),
HIGH << GPIO_SHIFT(offset));
return 0;
}
static int starfive_gpio_direction_output(struct udevice *dev, u32 offset,
int value)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (offset > uc_priv->gpio_count)
return -EINVAL;
/* Configure gpio direction as output */
clrsetbits_le32(plat->base + GPIO_OFFSET(offset),
GPIO_DOEN_MASK << GPIO_SHIFT(offset),
LOW << GPIO_SHIFT(offset));
/* Set the output value of the pin */
clrsetbits_le32(plat->base + GPIO_DOUT + GPIO_OFFSET(offset),
GPIO_DOUT_MASK << GPIO_SHIFT(offset),
(value & GPIO_DOUT_MASK) << GPIO_SHIFT(offset));
return 0;
}
static int starfive_gpio_get_value(struct udevice *dev, u32 offset)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int val;
if (offset > uc_priv->gpio_count)
return -EINVAL;
/*Get dout value*/
val = readl(plat->base + GPIO_DIN + GPIO_OFFSET(offset));
val &= GPIO_DIN_MASK << GPIO_SHIFT(offset);
return val ? HIGH : LOW;
}
static int starfive_gpio_set_value(struct udevice *dev, u32 offset, int value)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (offset > uc_priv->gpio_count)
return -EINVAL;
clrsetbits_le32(plat->base + GPIO_DOUT + GPIO_OFFSET(offset),
GPIO_DOUT_MASK << GPIO_SHIFT(offset),
(value & GPIO_DOUT_MASK) << GPIO_SHIFT(offset));
return 0;
}
static int starfive_gpio_get_function(struct udevice *dev, unsigned int offset)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
u32 dir, val;
if (offset > uc_priv->gpio_count)
return -1;
/*Get doen value*/
val = readl(plat->base + GPIO_OFFSET(offset));
val &= (GPIO_DOEN_MASK << GPIO_SHIFT(offset));
dir = (val > 1) ? GPIOF_UNUSED : (val ? GPIOF_INPUT : GPIOF_OUTPUT);
return dir;
}
static int starfive_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct starfive_gpio_platdata *plat = dev_get_plat(dev);
fdt_addr_t addr;
addr = dev_read_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
plat->base = (void *)addr;
writel(0, plat->base + GPIO_EN);
writel(0, plat->base + GPIO_LOW_IE);
writel(0, plat->base + GPIO_HIGH_IE);
writel(1, plat->base + GPIO_EN);
return 0;
}
static const struct udevice_id starfive_gpio_match[] = {
{ .compatible = "starfive,jh7110-gpio" },
{ }
};
static const struct dm_gpio_ops starfive_gpio_ops = {
.direction_input = starfive_gpio_direction_input,
.direction_output = starfive_gpio_direction_output,
.get_value = starfive_gpio_get_value,
.set_value = starfive_gpio_set_value,
.get_function = starfive_gpio_get_function,
};
U_BOOT_DRIVER(gpio_starfive) = {
.name = "gpio_starfive",
.id = UCLASS_GPIO,
.of_match = starfive_gpio_match,
.of_to_plat = starfive_gpio_ofdata_to_platdata,
.plat_auto = sizeof(struct starfive_gpio_platdata),
.ops = &starfive_gpio_ops,
.probe = starfive_gpio_probe,
};
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