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[ARM] pxa: make pxa_gpio_irq_type() processor generic

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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>
This commit is contained in:
eric miao 2008-03-04 17:18:38 +08:00 committed by Russell King
parent 663707c1a9
commit 689c04a390
1 changed files with 18 additions and 2 deletions
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20
arch/arm/mach-pxa/gpio.c
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@ -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);