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authorRabin Vincent <rabin.vincent@stericsson.com>2010-05-27 13:39:23 +0200
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-06-16 23:26:10 +0200
commit81a3c2989227e025b715e18299431395083b39e5 (patch)
tree08008a20cb1625bc20460d81c0d426d5ee94c5d0 /arch/arm/plat-nomadik/gpio.c
parentARM: 6148/1: nomadik-gpio: add function to configure pullup/pulldown (diff)
downloadlinux-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/arm/plat-nomadik/gpio.c')
-rw-r--r--arch/arm/plat-nomadik/gpio.c40
1 files changed, 40 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