diff options
| author | eric miao <eric.miao@marvell.com> | 2008-03-04 17:18:38 +0800 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-19 11:29:04 +0100 |
| commit | 689c04a3904d68343a9258e2de12412e3bb89d09 (patch) | |
| tree | 777b047f0a21f87296dd9e29bea06108b6e03e91 /arch | |
| parent | 663707c1a99b23a79f9e21117b7c1bdbfe80a899 (diff) | |
[ARM] pxa: make pxa_gpio_irq_type() processor generic
The main issue here is that pxa3xx does not have GAFRx registers,
access directly to these registers should be avoided for pxa3xx:
1. introduce __gpio_is_occupied() to indicate the GAFRx and GPDRx
registers are already configured on pxa{25x,27x} while returns
0 always on pxa3xx
2. pxa_gpio_mode(gpio | GPIO_IN) is replaced directly with assign-
ment of GPDRx, the side effect of this change is that the pin
_must_ be configured before use, pxa_gpio_irq_type() will not
change the pin to GPIO, as this restriction is sane, esp. with
the new MFP framework
Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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); |