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/*
* Marvell Orion/MVEBU SoC GPIO driver
*
* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <errno.h>
#include <gpio.h>
#include <init.h>
#include <io.h>
#include <malloc.h>
struct orion_gpio_regs {
u32 data_o;
u32 data_o_en;
u32 blink;
u32 data_i_pol;
u32 data_i;
u32 irq_cause;
u32 irq_mask;
u32 irq_level_mask;
};
struct orion_gpio_chip {
struct gpio_chip chip;
struct orion_gpio_regs __iomem *regs;
};
static int orion_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
struct orion_gpio_chip *gpio =
container_of(chip, struct orion_gpio_chip, chip);
writel(readl(&gpio->regs->data_o_en) | BIT(off),
&gpio->regs->data_o_en);
return 0;
}
static int orion_gpio_direction_output(
struct gpio_chip *chip, unsigned off, int value)
{
struct orion_gpio_chip *gpio =
container_of(chip, struct orion_gpio_chip, chip);
gpio->chip.ops->set(chip, off, value);
writel(readl(&gpio->regs->data_o_en) & ~BIT(off),
&gpio->regs->data_o_en);
return 0;
}
static int orion_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
struct orion_gpio_chip *gpio =
container_of(chip, struct orion_gpio_chip, chip);
return (readl(&gpio->regs->data_i) & BIT(off)) ? 1 : 0;
}
static void orion_gpio_set_value(
struct gpio_chip *chip, unsigned off, int value)
{
struct orion_gpio_chip *gpio =
container_of(chip, struct orion_gpio_chip, chip);
u32 val;
val = readl(&gpio->regs->data_o);
if (value)
val |= BIT(off);
else
val &= ~BIT(off);
writel(val, &gpio->regs->data_o);
}
static struct gpio_ops orion_gpio_ops = {
.direction_input = orion_gpio_direction_input,
.direction_output = orion_gpio_direction_output,
.get = orion_gpio_get_value,
.set = orion_gpio_set_value,
};
static int orion_gpio_probe(struct device_d *dev)
{
struct orion_gpio_chip *gpio;
dev->id = of_alias_get_id(dev->device_node, "gpio");
if (dev->id < 0)
return dev->id;
gpio = xzalloc(sizeof(*gpio));
gpio->regs = dev_request_mem_region(dev, 0);
if (!gpio->regs) {
free(gpio);
return -EINVAL;
}
gpio->chip.dev = dev;
gpio->chip.ops = &orion_gpio_ops;
gpio->chip.base = dev->id * 32;
gpio->chip.ngpio = 32;
of_property_read_u32(dev->device_node, "ngpios", &gpio->chip.ngpio);
gpiochip_add(&gpio->chip);
dev_dbg(dev, "probed gpio%d with base %d\n", dev->id, gpio->chip.base);
return 0;
}
static struct of_device_id orion_gpio_dt_ids[] = {
{ .compatible = "marvell,orion-gpio", },
{ }
};
static struct driver_d orion_gpio_driver = {
.name = "orion-gpio",
.probe = orion_gpio_probe,
.of_compatible = DRV_OF_COMPAT(orion_gpio_dt_ids),
};
static int orion_gpio_init(void)
{
return platform_driver_register(&orion_gpio_driver);
}
postcore_initcall(orion_gpio_init);
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