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ARM: 6149/1: nomadik-gpio: add function to configure sleep mode behaviour

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Cc: Alessandro Rubini <rubini@unipv.it>

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2010-05-27 12:39:23 +01:00 committed by Russell King
parent 5b327edf03
commit 81a3c29892
2 changed files with 47 additions and 0 deletions
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40
arch/arm/plat-nomadik/gpio.c
View File

@ -46,6 +46,20 @@ struct nmk_gpio_chip {
u32 edge_falling;
};
static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
unsigned offset, enum nmk_gpio_slpm mode)
{
u32 bit = 1 << offset;
u32 slpm;
slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
if (mode == NMK_GPIO_SLPM_NOCHANGE)
slpm |= bit;
else
slpm &= ~bit;
writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
}
static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
unsigned offset, enum nmk_gpio_pull pull)
{
@ -65,6 +79,32 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
}
/**
* nmk_gpio_set_slpm() - configure the sleep mode of a pin
* @gpio: pin number
* @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
*
* Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is
* changed to an input (with pullup/down enabled) in sleep and deep sleep. If
* @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was
* configured even when in sleep and deep sleep.
*/
int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
{
struct nmk_gpio_chip *nmk_chip;
unsigned long flags;
nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
if (!nmk_chip)
return -EINVAL;
spin_lock_irqsave(&nmk_chip->lock, flags);
__nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode);
spin_unlock_irqrestore(&nmk_chip->lock, flags);
return 0;
}
/**
* nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
* @gpio: pin number

7
arch/arm/plat-nomadik/include/plat/gpio.h
View File

@ -62,6 +62,13 @@ enum nmk_gpio_pull {
NMK_GPIO_PULL_DOWN,
};
/* Sleep mode */
enum nmk_gpio_slpm {
NMK_GPIO_SLPM_INPUT,
NMK_GPIO_SLPM_NOCHANGE,
};
extern int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode);
extern int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull);
extern int nmk_gpio_set_mode(int gpio, int gpio_mode);
extern int nmk_gpio_get_mode(int gpio);