Commit 0218d5a8 authored by Axel Lin's avatar Axel Lin Committed by Linus Walleij
Browse files

gpio: bcm-kona: Implement get_direction callback 



Implement gpio_chip's get_direction() callback, that lets other drivers get
particular GPIOs direction using gpiod_get_direction().

Signed-off-by: default avatarAxel Lin <axel.lin@ingics.com>
Reviewed-by: default avatarRay Jui <rjui@broadcom.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent b787f68c

drivers/gpio/gpio-bcm-kona.c

+16 −10
Original line number Diff line number Diff line
@@ -122,6 +122,16 @@ static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio, 
	spin_unlock_irqrestore(&kona_gpio->lock, flags);

}



static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio)

{

	struct bcm_kona_gpio *kona_gpio = to_kona_gpio(chip);

	void __iomem *reg_base = kona_gpio->reg_base;

	u32 val;



	val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK;

	return val ? GPIOF_DIR_IN : GPIOF_DIR_OUT;

}



static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)

{

	struct bcm_kona_gpio *kona_gpio;
@@ -135,12 +145,8 @@ static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value) 
	reg_base = kona_gpio->reg_base;

	spin_lock_irqsave(&kona_gpio->lock, flags);



	/* determine the GPIO pin direction */

	val = readl(reg_base + GPIO_CONTROL(gpio));

	val &= GPIO_GPCTR0_IOTR_MASK;



	/* this function only applies to output pin */

	if (GPIO_GPCTR0_IOTR_CMD_INPUT == val)

	if (bcm_kona_gpio_get_dir(chip, gpio) == GPIOF_DIR_IN)

		goto out;



	reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
@@ -166,13 +172,12 @@ static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio) 
	reg_base = kona_gpio->reg_base;

	spin_lock_irqsave(&kona_gpio->lock, flags);



	/* determine the GPIO pin direction */

	val = readl(reg_base + GPIO_CONTROL(gpio));

	val &= GPIO_GPCTR0_IOTR_MASK;

	if (bcm_kona_gpio_get_dir(chip, gpio) == GPIOF_DIR_IN)

		reg_offset = GPIO_IN_STATUS(bank_id);

	else

		reg_offset = GPIO_OUT_STATUS(bank_id);



	/* read the GPIO bank status */

	reg_offset = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ?

	    GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id);

	val = readl(reg_base + reg_offset);



	spin_unlock_irqrestore(&kona_gpio->lock, flags);
@@ -310,6 +315,7 @@ static struct gpio_chip template_chip = { 
	.owner = THIS_MODULE,

	.request = bcm_kona_gpio_request,

	.free = bcm_kona_gpio_free,

	.get_direction = bcm_kona_gpio_get_dir,

	.direction_input = bcm_kona_gpio_direction_input,

	.get = bcm_kona_gpio_get,

	.direction_output = bcm_kona_gpio_direction_output,

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