2 * Atheros AR71XX/AR724X/AR913X GPIO API support
4 * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
5 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
8 * Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
15 #include <linux/gpio/driver.h>
16 #include <linux/platform_data/gpio-ath79.h>
17 #include <linux/of_device.h>
19 #include <asm/mach-ath79/ar71xx_regs.h>
21 struct ath79_gpio_ctrl
{
22 struct gpio_chip chip
;
27 static void ath79_gpio_set_value(struct gpio_chip
*chip
,
28 unsigned gpio
, int value
)
30 struct ath79_gpio_ctrl
*ctrl
= gpiochip_get_data(chip
);
33 __raw_writel(BIT(gpio
), ctrl
->base
+ AR71XX_GPIO_REG_SET
);
35 __raw_writel(BIT(gpio
), ctrl
->base
+ AR71XX_GPIO_REG_CLEAR
);
38 static int ath79_gpio_get_value(struct gpio_chip
*chip
, unsigned gpio
)
40 struct ath79_gpio_ctrl
*ctrl
= gpiochip_get_data(chip
);
42 return (__raw_readl(ctrl
->base
+ AR71XX_GPIO_REG_IN
) >> gpio
) & 1;
45 static int ath79_gpio_direction_input(struct gpio_chip
*chip
,
48 struct ath79_gpio_ctrl
*ctrl
= gpiochip_get_data(chip
);
51 spin_lock_irqsave(&ctrl
->lock
, flags
);
54 __raw_readl(ctrl
->base
+ AR71XX_GPIO_REG_OE
) & ~BIT(offset
),
55 ctrl
->base
+ AR71XX_GPIO_REG_OE
);
57 spin_unlock_irqrestore(&ctrl
->lock
, flags
);
62 static int ath79_gpio_direction_output(struct gpio_chip
*chip
,
63 unsigned offset
, int value
)
65 struct ath79_gpio_ctrl
*ctrl
= gpiochip_get_data(chip
);
68 spin_lock_irqsave(&ctrl
->lock
, flags
);
71 __raw_writel(BIT(offset
), ctrl
->base
+ AR71XX_GPIO_REG_SET
);
73 __raw_writel(BIT(offset
), ctrl
->base
+ AR71XX_GPIO_REG_CLEAR
);
76 __raw_readl(ctrl
->base
+ AR71XX_GPIO_REG_OE
) | BIT(offset
),
77 ctrl
->base
+ AR71XX_GPIO_REG_OE
);
79 spin_unlock_irqrestore(&ctrl
->lock
, flags
);
84 static int ar934x_gpio_direction_input(struct gpio_chip
*chip
, unsigned offset
)
86 struct ath79_gpio_ctrl
*ctrl
= gpiochip_get_data(chip
);
89 spin_lock_irqsave(&ctrl
->lock
, flags
);
92 __raw_readl(ctrl
->base
+ AR71XX_GPIO_REG_OE
) | BIT(offset
),
93 ctrl
->base
+ AR71XX_GPIO_REG_OE
);
95 spin_unlock_irqrestore(&ctrl
->lock
, flags
);
100 static int ar934x_gpio_direction_output(struct gpio_chip
*chip
, unsigned offset
,
103 struct ath79_gpio_ctrl
*ctrl
= gpiochip_get_data(chip
);
106 spin_lock_irqsave(&ctrl
->lock
, flags
);
109 __raw_writel(BIT(offset
), ctrl
->base
+ AR71XX_GPIO_REG_SET
);
111 __raw_writel(BIT(offset
), ctrl
->base
+ AR71XX_GPIO_REG_CLEAR
);
114 __raw_readl(ctrl
->base
+ AR71XX_GPIO_REG_OE
) & ~BIT(offset
),
115 ctrl
->base
+ AR71XX_GPIO_REG_OE
);
117 spin_unlock_irqrestore(&ctrl
->lock
, flags
);
122 static const struct gpio_chip ath79_gpio_chip
= {
124 .get
= ath79_gpio_get_value
,
125 .set
= ath79_gpio_set_value
,
126 .direction_input
= ath79_gpio_direction_input
,
127 .direction_output
= ath79_gpio_direction_output
,
131 static const struct of_device_id ath79_gpio_of_match
[] = {
132 { .compatible
= "qca,ar7100-gpio" },
133 { .compatible
= "qca,ar9340-gpio" },
137 static int ath79_gpio_probe(struct platform_device
*pdev
)
139 struct ath79_gpio_platform_data
*pdata
= dev_get_platdata(&pdev
->dev
);
140 struct device_node
*np
= pdev
->dev
.of_node
;
141 struct ath79_gpio_ctrl
*ctrl
;
142 struct resource
*res
;
143 u32 ath79_gpio_count
;
147 ctrl
= devm_kzalloc(&pdev
->dev
, sizeof(*ctrl
), GFP_KERNEL
);
152 err
= of_property_read_u32(np
, "ngpios", &ath79_gpio_count
);
154 dev_err(&pdev
->dev
, "ngpios property is not valid\n");
157 if (ath79_gpio_count
>= 32) {
158 dev_err(&pdev
->dev
, "ngpios must be less than 32\n");
161 oe_inverted
= of_device_is_compatible(np
, "qca,ar9340-gpio");
163 ath79_gpio_count
= pdata
->ngpios
;
164 oe_inverted
= pdata
->oe_inverted
;
166 dev_err(&pdev
->dev
, "No DT node or platform data found\n");
170 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
171 ctrl
->base
= devm_ioremap_nocache(
172 &pdev
->dev
, res
->start
, resource_size(res
));
176 spin_lock_init(&ctrl
->lock
);
177 memcpy(&ctrl
->chip
, &ath79_gpio_chip
, sizeof(ctrl
->chip
));
178 ctrl
->chip
.parent
= &pdev
->dev
;
179 ctrl
->chip
.ngpio
= ath79_gpio_count
;
181 ctrl
->chip
.direction_input
= ar934x_gpio_direction_input
;
182 ctrl
->chip
.direction_output
= ar934x_gpio_direction_output
;
185 err
= gpiochip_add_data(&ctrl
->chip
, ctrl
);
188 "cannot add AR71xx GPIO chip, error=%d", err
);
195 static struct platform_driver ath79_gpio_driver
= {
197 .name
= "ath79-gpio",
198 .of_match_table
= ath79_gpio_of_match
,
200 .probe
= ath79_gpio_probe
,
203 module_platform_driver(ath79_gpio_driver
);