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