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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2009 Wind River Systems, Inc. (Tom Rix <Tom.Rix@windriver.com>)
// SPDX-FileCopyrightText: 2003-2005 Nokia Corporation (Juha Yrjölä <juha.yrjola@nokia.com>)
/*
* Support functions for OMAP GPIO
*
* This work is derived from the omap GPIO driver in Linux 2.6.27.
*/
#include <common.h>
#include <io.h>
#include <errno.h>
#include <gpio.h>
#include <init.h>
#include <linux/err.h>
#define OMAP_GPIO_OE 0x0034
#define OMAP_GPIO_DATAIN 0x0038
#define OMAP_GPIO_DATAOUT 0x003c
#define OMAP_GPIO_CLEARDATAOUT 0x0090
#define OMAP_GPIO_SETDATAOUT 0x0094
struct omap_gpio_chip {
void __iomem *base;
struct gpio_chip chip;
};
struct omap_gpio_drvdata {
unsigned int regofs;
};
static struct omap_gpio_drvdata gpio_omap3_drvdata = {
.regofs = 0x0,
};
static struct omap_gpio_drvdata gpio_omap4_drvdata = {
.regofs = 0x100,
};
static inline int omap_get_gpio_index(int gpio)
{
return gpio & 0x1f;
}
static void omap_gpio_set_value(struct gpio_chip *chip,
unsigned gpio, int value)
{
struct omap_gpio_chip *omapgpio =
container_of(chip, struct omap_gpio_chip, chip);
void __iomem *base = omapgpio->base;
u32 l = 0;
if (value)
base += OMAP_GPIO_SETDATAOUT;
else
base += OMAP_GPIO_CLEARDATAOUT;
l = 1 << omap_get_gpio_index(gpio);
writel(l, base);
}
static int omap_gpio_direction_input(struct gpio_chip *chip,
unsigned gpio)
{
struct omap_gpio_chip *omapgpio =
container_of(chip, struct omap_gpio_chip, chip);
void __iomem *base = omapgpio->base;
u32 val;
base += OMAP_GPIO_OE;
val = readl(base);
val |= 1 << omap_get_gpio_index(gpio);
writel(val, base);
return 0;
}
static int omap_gpio_direction_output(struct gpio_chip *chip,
unsigned gpio, int value)
{
struct omap_gpio_chip *omapgpio =
container_of(chip, struct omap_gpio_chip, chip);
void __iomem *base = omapgpio->base;
u32 val;
omap_gpio_set_value(chip, gpio, value);
base += OMAP_GPIO_OE;
val = readl(base);
val &= ~(1 << omap_get_gpio_index(gpio));
writel(val, base);
return 0;
}
static int omap_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
struct omap_gpio_chip *omapgpio =
container_of(chip, struct omap_gpio_chip, chip);
void __iomem *base = omapgpio->base;
base += OMAP_GPIO_DATAIN;
return (readl(base) & (1 << omap_get_gpio_index(gpio))) != 0;
}
static struct gpio_ops omap_gpio_ops = {
.direction_input = omap_gpio_direction_input,
.direction_output = omap_gpio_direction_output,
.get = omap_gpio_get_value,
.set = omap_gpio_set_value,
};
static int omap_gpio_probe(struct device_d *dev)
{
struct resource *iores;
struct omap_gpio_chip *omapgpio;
struct omap_gpio_drvdata *drvdata = NULL;
dev_get_drvdata(dev, (const void **)&drvdata);
omapgpio = xzalloc(sizeof(*omapgpio));
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
omapgpio->base = IOMEM(iores->start);
if (drvdata)
omapgpio->base += drvdata->regofs;
omapgpio->chip.ops = &omap_gpio_ops;
if (dev->id < 0) {
omapgpio->chip.base = of_alias_get_id(dev->device_node, "gpio");
if (omapgpio->chip.base < 0)
return omapgpio->chip.base;
omapgpio->chip.base *= 32;
} else {
omapgpio->chip.base = dev->id * 32;
}
omapgpio->chip.ngpio = 32;
omapgpio->chip.dev = dev;
gpiochip_add(&omapgpio->chip);
dev_dbg(dev, "probed gpiochip%d with base %d\n",
dev->id, omapgpio->chip.base);
return 0;
}
static __maybe_unused struct of_device_id omap_gpio_dt_ids[] = {
{
.compatible = "ti,omap4-gpio",
.data = &gpio_omap4_drvdata,
}, {
.compatible = "ti,omap3-gpio",
.data = &gpio_omap3_drvdata,
}, {
}
};
static struct driver_d omap_gpio_driver = {
.name = "omap-gpio",
.probe = omap_gpio_probe,
.of_compatible = DRV_OF_COMPAT(omap_gpio_dt_ids),
};
coredevice_platform_driver(omap_gpio_driver);
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