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/*
* Atheros AR71XX/AR724X/AR913X GPIO API support
*
* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/gpio/driver.h>
#include <linux/platform_data/gpio-ath79.h>
#include <linux/of_device.h>
#define AR71XX_GPIO_REG_OE 0x00
#define AR71XX_GPIO_REG_IN 0x04
#define AR71XX_GPIO_REG_SET 0x0c
#define AR71XX_GPIO_REG_CLEAR 0x10
struct ath79_gpio_ctrl {
struct gpio_chip gc;
void __iomem *base;
spinlock_t lock;
};
static const struct of_device_id ath79_gpio_of_match[] = {
{ .compatible = "qca,ar7100-gpio" },
{ .compatible = "qca,ar9340-gpio" },
{},
};
static int ath79_gpio_probe(struct platform_device *pdev)
{
struct ath79_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
struct ath79_gpio_ctrl *ctrl;
struct resource *res;
u32 ath79_gpio_count;
bool oe_inverted;
int err;
ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
if (np) {
err = of_property_read_u32(np, "ngpios", &ath79_gpio_count);
if (err) {
dev_err(&pdev->dev, "ngpios property is not valid\n");
return err;
}
if (ath79_gpio_count >= 32) {
dev_err(&pdev->dev, "ngpios must be less than 32\n");
return -EINVAL;
}
oe_inverted = of_device_is_compatible(np, "qca,ar9340-gpio");
} else if (pdata) {
ath79_gpio_count = pdata->ngpios;
oe_inverted = pdata->oe_inverted;
} else {
dev_err(&pdev->dev, "No DT node or platform data found\n");
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ctrl->base = devm_ioremap_nocache(
&pdev->dev, res->start, resource_size(res));
if (!ctrl->base)
return -ENOMEM;
spin_lock_init(&ctrl->lock);
err = bgpio_init(&ctrl->gc, &pdev->dev, 4,
ctrl->base + AR71XX_GPIO_REG_IN,
ctrl->base + AR71XX_GPIO_REG_SET,
ctrl->base + AR71XX_GPIO_REG_CLEAR,
oe_inverted ? NULL : ctrl->base + AR71XX_GPIO_REG_OE,
oe_inverted ? ctrl->base + AR71XX_GPIO_REG_OE : NULL,
0);
if (err) {
dev_err(&pdev->dev, "bgpio_init failed\n");
return err;
}
/* Use base 0 to stay compatible with legacy platforms */
ctrl->gc.base = 0;
err = gpiochip_add_data(&ctrl->gc, ctrl);
if (err) {
dev_err(&pdev->dev,
"cannot add AR71xx GPIO chip, error=%d", err);
return err;
}
return 0;
}
static struct platform_driver ath79_gpio_driver = {
.driver = {
.name = "ath79-gpio",
.of_match_table = ath79_gpio_of_match,
},
.probe = ath79_gpio_probe,
};
module_platform_driver(ath79_gpio_driver);
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