diff options
| author | Rabin Vincent <rabin.vincent@stericsson.com> | 2010-05-27 13:39:23 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-06-16 23:26:10 +0200 |
| commit | 81a3c2989227e025b715e18299431395083b39e5 (patch) | |
| tree | 08008a20cb1625bc20460d81c0d426d5ee94c5d0 /arch | |
| parent | ARM: 6148/1: nomadik-gpio: add function to configure pullup/pulldown (diff) | |
| download | linux-81a3c2989227e025b715e18299431395083b39e5.tar.xz linux-81a3c2989227e025b715e18299431395083b39e5.zip | |
ARM: 6149/1: nomadik-gpio: add function to configure sleep mode behaviour
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>
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 50c49fa9e01a..a678e887e0fe 100644 --- a/arch/arm/plat-nomadik/gpio.c +++ b/arch/arm/plat-nomadik/gpio.c @@ -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) { @@ -66,6 +80,32 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, } /** + * 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 * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE diff --git a/arch/arm/plat-nomadik/include/plat/gpio.h b/arch/arm/plat-nomadik/include/plat/gpio.h index 1d97e96ad1f4..aba355101f49 100644 --- a/arch/arm/plat-nomadik/include/plat/gpio.h +++ b/arch/arm/plat-nomadik/include/plat/gpio.h @@ -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); |