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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2019 Stephan Gerhold */
#include <dm.h>
#include <asm/gpio.h>
#include <asm/io.h>
struct nmk_gpio_regs {
u32 dat; /* data */
u32 dats; /* data set */
u32 datc; /* data clear */
u32 pdis; /* pull disable */
u32 dir; /* direction */
u32 dirs; /* direction set */
u32 dirc; /* direction clear */
u32 slpm; /* sleep mode */
u32 afsla; /* alternate function select A */
u32 afslb; /* alternate function select B */
u32 lowemi; /* low EMI mode */
};
struct nmk_gpio {
struct nmk_gpio_regs *regs;
};
static int nmk_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct nmk_gpio *priv = dev_get_priv(dev);
return !!(readl(&priv->regs->dat) & BIT(offset));
}
static int nmk_gpio_set_value(struct udevice *dev, unsigned offset, int value)
{
struct nmk_gpio *priv = dev_get_priv(dev);
if (value)
writel(BIT(offset), &priv->regs->dats);
else
writel(BIT(offset), &priv->regs->datc);
return 0;
}
static int nmk_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct nmk_gpio *priv = dev_get_priv(dev);
if (readl(&priv->regs->afsla) & BIT(offset) ||
readl(&priv->regs->afslb) & BIT(offset))
return GPIOF_FUNC;
if (readl(&priv->regs->dir) & BIT(offset))
return GPIOF_OUTPUT;
else
return GPIOF_INPUT;
}
static int nmk_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct nmk_gpio *priv = dev_get_priv(dev);
writel(BIT(offset), &priv->regs->dirc);
return 0;
}
static int nmk_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
struct nmk_gpio *priv = dev_get_priv(dev);
writel(BIT(offset), &priv->regs->dirs);
return nmk_gpio_set_value(dev, offset, value);
}
static const struct dm_gpio_ops nmk_gpio_ops = {
.get_value = nmk_gpio_get_value,
.set_value = nmk_gpio_set_value,
.get_function = nmk_gpio_get_function,
.direction_input = nmk_gpio_direction_input,
.direction_output = nmk_gpio_direction_output,
};
static int nmk_gpio_probe(struct udevice *dev)
{
struct nmk_gpio *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
char buf[20];
u32 bank;
int ret;
priv->regs = dev_read_addr_ptr(dev);
if (!priv->regs)
return -EINVAL;
ret = dev_read_u32(dev, "gpio-bank", &bank);
if (ret < 0) {
printf("nmk_gpio(%s): Failed to read gpio-bank\n", dev->name);
return ret;
}
sprintf(buf, "nmk%u-gpio", bank);
uc_priv->bank_name = strdup(buf);
if (!uc_priv->bank_name)
return -ENOMEM;
uc_priv->gpio_count = sizeof(priv->regs->dat) * BITS_PER_BYTE;
return 0;
}
static const struct udevice_id nmk_gpio_ids[] = {
{ .compatible = "st,nomadik-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_nmk) = {
.name = "nmk_gpio",
.id = UCLASS_GPIO,
.of_match = nmk_gpio_ids,
.probe = nmk_gpio_probe,
.ops = &nmk_gpio_ops,
.priv_auto = sizeof(struct nmk_gpio),
};
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