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authorRabin Vincent <rabin.vincent@stericsson.com>2010-05-27 13:29:50 +0200
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-06-16 23:26:10 +0200
commit5b327edf03c037ea6dc49a98a2b7f7186298ad1e (patch)
treee971eed0cbd971dd30f821b4d32f4bf0fb848541 /arch/arm/plat-nomadik/gpio.c
parentARM: 6147/1: nomadik-gpio: set val in ->direction_output() (diff)
downloadlinux-5b327edf03c037ea6dc49a98a2b7f7186298ad1e.tar.xz
linux-5b327edf03c037ea6dc49a98a2b7f7186298ad1e.zip
ARM: 6148/1: nomadik-gpio: add function to configure pullup/pulldown
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.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index 13cdbbdc08ca..50c49fa9e01a 100644
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -46,6 +46,54 @@ struct nmk_gpio_chip {
u32 edge_falling;
};
+static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
+ unsigned offset, enum nmk_gpio_pull pull)
+{
+ u32 bit = 1 << offset;
+ u32 pdis;
+
+ pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
+ if (pull == NMK_GPIO_PULL_NONE)
+ pdis |= bit;
+ else
+ pdis &= ~bit;
+ writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
+
+ if (pull == NMK_GPIO_PULL_UP)
+ writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
+ else if (pull == NMK_GPIO_PULL_DOWN)
+ writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
+}
+
+/**
+ * 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
+ *
+ * Enables/disables pull up/down on a specified pin. This only takes effect if
+ * the pin is configured as an input (either explicitly or by the alternate
+ * function).
+ *
+ * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
+ * configured as an input. Otherwise, due to the way the controller registers
+ * work, this function will change the value output on the pin.
+ */
+int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
+{
+ 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_pull(nmk_chip, gpio - nmk_chip->chip.base, pull);
+ spin_unlock_irqrestore(&nmk_chip->lock, flags);
+
+ return 0;
+}
+
/* Mode functions */
int nmk_gpio_set_mode(int gpio, int gpio_mode)
{