diff options
| author | Rabin Vincent <rabin.vincent@stericsson.com> | 2010-05-06 14:58:12 +0530 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2010-09-02 22:45:23 -0600 |
| commit | 6d50402881c6abd03f9bebc45bb16d41d4e6c71b (patch) | |
| tree | e2e9638bac85a562e79df11fd5ca1d8e1d19dd36 /arch | |
| parent | ede8eb976e239fbfc27ee08f92d0dd5e87f30566 (diff) | |
| download | linux-2.6.34-ux500-6d50402881c6abd03f9bebc45bb16d41d4e6c71b.tar.gz | |
nomadik-gpio: add function to configure sleep mode behaviour
ST-Ericsson Change ID: AP261164
Change-Id: I6c00ff124810e38aabaef7b30248809dda824e04
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-nomadik/gpio.c | 40 | ||||
| -rw-r--r-- | arch/arm/plat-nomadik/include/plat/gpio.h | 7 |
2 files changed, 47 insertions, 0 deletions
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c index e23fa7c200b..99542aff287 100644 --- a/arch/arm/plat-nomadik/gpio.c +++ b/arch/arm/plat-nomadik/gpio.c @@ -46,6 +46,46 @@ struct nmk_gpio_chip { u32 backup[10]; }; +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); +} + +/** + * 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 it + * 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 diff --git a/arch/arm/plat-nomadik/include/plat/gpio.h b/arch/arm/plat-nomadik/include/plat/gpio.h index c45b99671ec..a5d1b50f9ab 100644 --- a/arch/arm/plat-nomadik/include/plat/gpio.h +++ b/arch/arm/plat-nomadik/include/plat/gpio.h @@ -60,6 +60,13 @@ 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); |