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// SPDX-License-Identifier: GPL-2.0+
/*
* Faraday Technology's FTGPIO010 controller.
*/
#include <dm.h>
#include <asm/io.h>
#include <asm/gpio.h>
struct ftgpio010_regs {
u32 out;
u32 in;
u32 direction; // 1 - output
u32 reserved;
u32 set;
u32 clear;
};
struct ftgpio010_plat {
struct ftgpio010_regs __iomem *regs;
};
static int ftgpio010_direction_input(struct udevice *dev, unsigned int pin)
{
struct ftgpio010_plat *plat = dev_get_plat(dev);
struct ftgpio010_regs *const regs = plat->regs;
clrbits_le32(®s->direction, 1 << pin);
return 0;
}
static int ftgpio010_direction_output(struct udevice *dev, unsigned int pin,
int val)
{
struct ftgpio010_plat *plat = dev_get_plat(dev);
struct ftgpio010_regs *const regs = plat->regs;
/* change the data first, then the direction. to avoid glitch */
out_le32(val ? ®s->set : ®s->clear, 1 << pin);
setbits_le32(®s->direction, 1 << pin);
return 0;
}
static int ftgpio010_get_value(struct udevice *dev, unsigned int pin)
{
struct ftgpio010_plat *plat = dev_get_plat(dev);
struct ftgpio010_regs *const regs = plat->regs;
return in_le32(®s->in) >> pin & 1;
}
static int ftgpio010_set_value(struct udevice *dev, unsigned int pin, int val)
{
struct ftgpio010_plat *plat = dev_get_plat(dev);
struct ftgpio010_regs *const regs = plat->regs;
out_le32(val ? ®s->set : ®s->clear, 1 << pin);
return 0;
}
static int ftgpio010_get_function(struct udevice *dev, unsigned int pin)
{
struct ftgpio010_plat *plat = dev_get_plat(dev);
struct ftgpio010_regs *const regs = plat->regs;
if (in_le32(®s->direction) >> pin & 1)
return GPIOF_OUTPUT;
return GPIOF_INPUT;
}
static int ftgpio010_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->gpio_count = ofnode_read_u32_default(dev_ofnode(dev),
"nr-gpios", 32);
return 0;
}
static int ftgpio010_of_to_plat(struct udevice *dev)
{
struct ftgpio010_plat *plat = dev_get_plat(dev);
plat->regs = dev_read_addr_ptr(dev);
return 0;
}
static const struct dm_gpio_ops ftgpio010_ops = {
.direction_input = ftgpio010_direction_input,
.direction_output = ftgpio010_direction_output,
.get_value = ftgpio010_get_value,
.set_value = ftgpio010_set_value,
.get_function = ftgpio010_get_function,
};
static const struct udevice_id ftgpio010_ids[] = {
{ .compatible = "faraday,ftgpio010" },
{ }
};
U_BOOT_DRIVER(ftgpio010) = {
.name = "ftgpio010",
.id = UCLASS_GPIO,
.of_match = ftgpio010_ids,
.ops = &ftgpio010_ops,
.of_to_plat = ftgpio010_of_to_plat,
.plat_auto = sizeof(struct ftgpio010_plat),
.probe = ftgpio010_probe,
};
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