diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-pxa/gpio.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c index a98b2da4c96..f96cae04f6f 100644 --- a/arch/arm/mach-pxa/gpio.c +++ b/arch/arm/mach-pxa/gpio.c @@ -164,6 +164,20 @@ static long GPIO_IRQ_rising_edge[4]; static long GPIO_IRQ_falling_edge[4]; static long GPIO_IRQ_mask[4]; +/* + * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate + * function of a GPIO, and GPDRx cannot be altered once configured. It + * is attributed as "occupied" here (I know this terminology isn't + * accurate, you are welcome to propose a better one :-) + */ +static int __gpio_is_occupied(unsigned gpio) +{ + if (cpu_is_pxa25x() || cpu_is_pxa27x()) + return GAFR(gpio) & (0x3 << (((gpio) & 0xf) * 2)); + else + return 0; +} + static int pxa_gpio_irq_type(unsigned int irq, unsigned int type) { int gpio, idx; @@ -179,12 +193,14 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type) GPIO_IRQ_falling_edge[idx] | GPDR(gpio)) & GPIO_bit(gpio)) return 0; - if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2))) + + if (__gpio_is_occupied(gpio)) return 0; + type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; } - pxa_gpio_mode(gpio | GPIO_IN); + GPDR(gpio) &= ~GPIO_bit(gpio); if (type & IRQ_TYPE_EDGE_RISING) __set_bit(gpio, GPIO_IRQ_rising_edge); |