[ARM] Orion: provide GPIO method for enabling hardware assisted blinking
This is a pre-requisite for implementing proper hardware accelerated
GPIO LED flashing, and since we want proper locking, it's sensible to provide
the orion specific orion_gpio_set_blink() implementation within
mach-orion/gpio.c. The functions orion_gpio_set_blink() and gpio_set_value()
implicitly turn off each others state.
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Acked-by: Tzachi Perelstein <tzachi@marvell.com>
Acked-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-orion/gpio.c b/arch/arm/mach-orion/gpio.c
index af8553c..0418f5b 100644
--- a/arch/arm/mach-orion/gpio.c
+++ b/arch/arm/mach-orion/gpio.c
@@ -76,6 +76,7 @@
gpio_label[pin] = "?";
mask = 1 << pin;
+ orion_clrbits(GPIO_BLINK_EN, mask);
if (value)
orion_setbits(GPIO_OUT, mask);
else
@@ -107,6 +108,7 @@
spin_lock_irqsave(&gpio_lock, flags);
+ orion_clrbits(GPIO_BLINK_EN, mask);
if (value)
orion_setbits(GPIO_OUT, mask);
else
@@ -116,6 +118,23 @@
}
EXPORT_SYMBOL(gpio_set_value);
+void orion_gpio_set_blink(unsigned pin, int blink)
+{
+ unsigned long flags;
+ int mask = 1 << pin;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ orion_clrbits(GPIO_OUT, mask);
+ if (blink)
+ orion_setbits(GPIO_BLINK_EN, mask);
+ else
+ orion_clrbits(GPIO_BLINK_EN, mask);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+}
+EXPORT_SYMBOL(orion_gpio_set_blink);
+
int gpio_request(unsigned pin, const char *label)
{
int ret = 0;
diff --git a/include/asm-arm/arch-orion/gpio.h b/include/asm-arm/arch-orion/gpio.h
index 6d5848e..d66284f 100644
--- a/include/asm-arm/arch-orion/gpio.h
+++ b/include/asm-arm/arch-orion/gpio.h
@@ -12,6 +12,7 @@
extern int gpio_direction_output(unsigned pin, int value);
extern int gpio_get_value(unsigned pin);
extern void gpio_set_value(unsigned pin, int value);
+extern void orion_gpio_set_blink(unsigned pin, int blink);
extern void gpio_display(void); /* debug */
static inline int gpio_to_irq(int pin)
