2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/spinlock.h>
13 #include <linux/platform_device.h>
14 #include <linux/gpio.h>
16 #include <bcm63xx_cpu.h>
17 #include <bcm63xx_gpio.h>
18 #include <bcm63xx_io.h>
19 #include <bcm63xx_regs.h>
21 static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
22 static u32 gpio_out_low, gpio_out_high;
24 static void bcm63xx_gpio_set(struct gpio_chip *chip,
25 unsigned gpio, int val)
32 if (gpio >= chip->ngpio)
36 reg = GPIO_DATA_LO_REG;
40 reg = GPIO_DATA_HI_REG;
41 mask = 1 << (gpio - 32);
45 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
50 bcm_gpio_writel(*v, reg);
51 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
54 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
59 if (gpio >= chip->ngpio)
63 reg = GPIO_DATA_LO_REG;
66 reg = GPIO_DATA_HI_REG;
67 mask = 1 << (gpio - 32);
70 return !!(bcm_gpio_readl(reg) & mask);
73 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
74 unsigned gpio, int dir)
81 if (gpio >= chip->ngpio)
85 reg = GPIO_CTL_LO_REG;
88 reg = GPIO_CTL_HI_REG;
89 mask = 1 << (gpio - 32);
92 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
93 tmp = bcm_gpio_readl(reg);
94 if (dir == BCM63XX_GPIO_DIR_IN)
98 bcm_gpio_writel(tmp, reg);
99 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
104 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
106 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
109 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
110 unsigned gpio, int value)
112 bcm63xx_gpio_set(chip, gpio, value);
113 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
117 static struct gpio_chip bcm63xx_gpio_chip = {
118 .label = "bcm63xx-gpio",
119 .direction_input = bcm63xx_gpio_direction_input,
120 .direction_output = bcm63xx_gpio_direction_output,
121 .get = bcm63xx_gpio_get,
122 .set = bcm63xx_gpio_set,
126 int __init bcm63xx_gpio_init(void)
128 gpio_out_low = bcm_gpio_readl(GPIO_DATA_LO_REG);
129 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
130 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
131 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
133 return gpiochip_add(&bcm63xx_gpio_chip);