149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
|
|
* Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio/driver.h>
|
|
|
|
#include <bcm63xx_cpu.h>
|
|
#include <bcm63xx_gpio.h>
|
|
#include <bcm63xx_io.h>
|
|
#include <bcm63xx_regs.h>
|
|
|
|
static u32 gpio_out_low_reg;
|
|
|
|
static void bcm63xx_gpio_out_low_reg_init(void)
|
|
{
|
|
switch (bcm63xx_get_cpu_id()) {
|
|
case BCM6345_CPU_ID:
|
|
gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
|
|
break;
|
|
default:
|
|
gpio_out_low_reg = GPIO_DATA_LO_REG;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
|
|
static u32 gpio_out_low, gpio_out_high;
|
|
|
|
static void bcm63xx_gpio_set(struct gpio_chip *chip,
|
|
unsigned gpio, int val)
|
|
{
|
|
u32 reg;
|
|
u32 mask;
|
|
u32 *v;
|
|
unsigned long flags;
|
|
|
|
BUG_ON(gpio >= chip->ngpio);
|
|
|
|
if (gpio < 32) {
|
|
reg = gpio_out_low_reg;
|
|
mask = 1 << gpio;
|
|
v = &gpio_out_low;
|
|
} else {
|
|
reg = GPIO_DATA_HI_REG;
|
|
mask = 1 << (gpio - 32);
|
|
v = &gpio_out_high;
|
|
}
|
|
|
|
spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
|
|
if (val)
|
|
*v |= mask;
|
|
else
|
|
*v &= ~mask;
|
|
bcm_gpio_writel(*v, reg);
|
|
spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
|
|
}
|
|
|
|
static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
u32 reg;
|
|
u32 mask;
|
|
|
|
BUG_ON(gpio >= chip->ngpio);
|
|
|
|
if (gpio < 32) {
|
|
reg = gpio_out_low_reg;
|
|
mask = 1 << gpio;
|
|
} else {
|
|
reg = GPIO_DATA_HI_REG;
|
|
mask = 1 << (gpio - 32);
|
|
}
|
|
|
|
return !!(bcm_gpio_readl(reg) & mask);
|
|
}
|
|
|
|
static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
|
|
unsigned gpio, int dir)
|
|
{
|
|
u32 reg;
|
|
u32 mask;
|
|
u32 tmp;
|
|
unsigned long flags;
|
|
|
|
BUG_ON(gpio >= chip->ngpio);
|
|
|
|
if (gpio < 32) {
|
|
reg = GPIO_CTL_LO_REG;
|
|
mask = 1 << gpio;
|
|
} else {
|
|
reg = GPIO_CTL_HI_REG;
|
|
mask = 1 << (gpio - 32);
|
|
}
|
|
|
|
spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
|
|
tmp = bcm_gpio_readl(reg);
|
|
if (dir == BCM63XX_GPIO_DIR_IN)
|
|
tmp &= ~mask;
|
|
else
|
|
tmp |= mask;
|
|
bcm_gpio_writel(tmp, reg);
|
|
spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
|
|
}
|
|
|
|
static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
|
|
unsigned gpio, int value)
|
|
{
|
|
bcm63xx_gpio_set(chip, gpio, value);
|
|
return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
|
|
}
|
|
|
|
|
|
static struct gpio_chip bcm63xx_gpio_chip = {
|
|
.label = "bcm63xx-gpio",
|
|
.direction_input = bcm63xx_gpio_direction_input,
|
|
.direction_output = bcm63xx_gpio_direction_output,
|
|
.get = bcm63xx_gpio_get,
|
|
.set = bcm63xx_gpio_set,
|
|
.base = 0,
|
|
};
|
|
|
|
int __init bcm63xx_gpio_init(void)
|
|
{
|
|
bcm63xx_gpio_out_low_reg_init();
|
|
|
|
gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
|
|
if (!BCMCPU_IS_6345())
|
|
gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
|
|
bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
|
|
pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
|
|
|
|
return gpiochip_add_data(&bcm63xx_gpio_chip, NULL);
|
|
}
|