lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] Orion: provide GPIO method for enabling hardware assisted blinking

Browse Source 
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>
This commit is contained in:
Herbert Valerio Riedel
2007-11-29 15:19:56 +01:00
committed by Russell King
parent 01af72e4e3
commit b11e9e020c
2 changed files with 20 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/arm/mach-orion/gpio.c
View File

@@ -76,6 +76,7 @@ int gpio_direction_output(unsigned pin, int value)
gpio_label[pin] = "?"; gpio_label[pin] = "?";
mask = 1 << pin; mask = 1 << pin;
orion_clrbits(GPIO_BLINK_EN, mask);
if (value) if (value)
orion_setbits(GPIO_OUT, mask); orion_setbits(GPIO_OUT, mask);
else else
@@ -107,6 +108,7 @@ void gpio_set_value(unsigned pin, int value)
spin_lock_irqsave(&gpio_lock, flags); spin_lock_irqsave(&gpio_lock, flags);
orion_clrbits(GPIO_BLINK_EN, mask);
if (value) if (value)
orion_setbits(GPIO_OUT, mask); orion_setbits(GPIO_OUT, mask);
else else
@@ -116,6 +118,23 @@ void gpio_set_value(unsigned pin, int value)
} }
EXPORT_SYMBOL(gpio_set_value); 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 gpio_request(unsigned pin, const char *label)
{ {
int ret = 0; int ret = 0;

1
include/asm-arm/arch-orion/gpio.h
View File

@@ -12,6 +12,7 @@ extern int gpio_direction_input(unsigned pin);
extern int gpio_direction_output(unsigned pin, int value); extern int gpio_direction_output(unsigned pin, int value);
extern int gpio_get_value(unsigned pin); extern int gpio_get_value(unsigned pin);
extern void gpio_set_value(unsigned pin, int value); 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 */ extern void gpio_display(void); /* debug */
static inline int gpio_to_irq(int pin) static inline int gpio_to_irq(int pin)