mvebu_gpio.c
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/*
* Copyright (C) 2016 Stefan Roese <sr@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
#define MVEBU_GPIOS_PER_BANK 32
struct mvebu_gpio_regs {
u32 data_out;
u32 io_conf;
u32 blink_en;
u32 in_pol;
u32 data_in;
};
struct mvebu_gpio_priv {
struct mvebu_gpio_regs *regs;
char name[2];
};
static int mvebu_gpio_direction_input(struct udevice *dev, unsigned int gpio)
{
struct mvebu_gpio_priv *priv = dev_get_priv(dev);
struct mvebu_gpio_regs *regs = priv->regs;
setbits_le32(®s->io_conf, BIT(gpio));
return 0;
}
static int mvebu_gpio_direction_output(struct udevice *dev, unsigned gpio,
int value)
{
struct mvebu_gpio_priv *priv = dev_get_priv(dev);
struct mvebu_gpio_regs *regs = priv->regs;
if (value)
setbits_le32(®s->data_out, BIT(gpio));
else
clrbits_le32(®s->data_out, BIT(gpio));
clrbits_le32(®s->io_conf, BIT(gpio));
return 0;
}
static int mvebu_gpio_get_function(struct udevice *dev, unsigned gpio)
{
struct mvebu_gpio_priv *priv = dev_get_priv(dev);
struct mvebu_gpio_regs *regs = priv->regs;
u32 val;
val = readl(®s->io_conf) & BIT(gpio);
if (val)
return GPIOF_INPUT;
else
return GPIOF_OUTPUT;
}
static int mvebu_gpio_set_value(struct udevice *dev, unsigned gpio,
int value)
{
struct mvebu_gpio_priv *priv = dev_get_priv(dev);
struct mvebu_gpio_regs *regs = priv->regs;
if (value)
setbits_le32(®s->data_out, BIT(gpio));
else
clrbits_le32(®s->data_out, BIT(gpio));
return 0;
}
static int mvebu_gpio_get_value(struct udevice *dev, unsigned gpio)
{
struct mvebu_gpio_priv *priv = dev_get_priv(dev);
struct mvebu_gpio_regs *regs = priv->regs;
return !!(readl(®s->data_in) & BIT(gpio));
}
static int mvebu_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct mvebu_gpio_priv *priv = dev_get_priv(dev);
priv->regs = (struct mvebu_gpio_regs *)devfdt_get_addr(dev);
uc_priv->gpio_count = MVEBU_GPIOS_PER_BANK;
priv->name[0] = 'A' + dev->req_seq;
uc_priv->bank_name = priv->name;
return 0;
}
static const struct dm_gpio_ops mvebu_gpio_ops = {
.direction_input = mvebu_gpio_direction_input,
.direction_output = mvebu_gpio_direction_output,
.get_function = mvebu_gpio_get_function,
.get_value = mvebu_gpio_get_value,
.set_value = mvebu_gpio_set_value,
};
static const struct udevice_id mvebu_gpio_ids[] = {
{ .compatible = "marvell,orion-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_mvebu) = {
.name = "gpio_mvebu",
.id = UCLASS_GPIO,
.of_match = mvebu_gpio_ids,
.ops = &mvebu_gpio_ops,
.probe = mvebu_gpio_probe,
.priv_auto_alloc_size = sizeof(struct mvebu_gpio_priv),
};