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[ARM] pxa: generalize the muxed gpio IRQ handling code with loop and ffs()

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1. As David Brownell suggests, using ffs() is going to make the loop
   a bit faster (by avoiding unnecessary shift and iteration)

2. Russell suggested find_{first,next}_bit() being used with the
   gedr[] array

Signed-off-by: eric miao <eric.miao@marvell.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
eric miao 2008-03-04 10:57:18 +08:00 committed by Russell King
parent d72b1370b0
commit 7a26d3a33f
1 changed files with 17 additions and 59 deletions
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76
arch/arm/mach-pxa/irq.c
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@ -178,73 +178,31 @@ static struct irq_chip pxa_low_gpio_chip = {
* Demux handler for GPIO>=2 edge detect interrupts
*/
#define GEDR_BITS (sizeof(gedr) * BITS_PER_BYTE)
static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned int mask;
int loop;
int loop, bit, n;
unsigned long gedr[4];
do {
gedr[0] = GEDR0 & GPIO_IRQ_mask[0] & ~3;
gedr[1] = GEDR1 & GPIO_IRQ_mask[1];
gedr[2] = GEDR2 & GPIO_IRQ_mask[2];
gedr[3] = GEDR3 & GPIO_IRQ_mask[3];
GEDR0 = gedr[0]; GEDR1 = gedr[1];
GEDR2 = gedr[2]; GEDR3 = gedr[3];
loop = 0;
mask = GEDR0 & GPIO_IRQ_mask[0] & ~3;
if (mask) {
GEDR0 = mask;
irq = IRQ_GPIO(2);
desc = irq_desc + irq;
mask >>= 2;
do {
if (mask & 1)
desc_handle_irq(irq, desc);
irq++;
desc++;
mask >>= 1;
} while (mask);
bit = find_first_bit(gedr, GEDR_BITS);
while (bit < GEDR_BITS) {
loop = 1;
}
mask = GEDR1 & GPIO_IRQ_mask[1];
if (mask) {
GEDR1 = mask;
irq = IRQ_GPIO(32);
desc = irq_desc + irq;
do {
if (mask & 1)
desc_handle_irq(irq, desc);
irq++;
desc++;
mask >>= 1;
} while (mask);
loop = 1;
}
n = PXA_GPIO_IRQ_BASE + bit;
desc_handle_irq(n, irq_desc + n);
mask = GEDR2 & GPIO_IRQ_mask[2];
if (mask) {
GEDR2 = mask;
irq = IRQ_GPIO(64);
desc = irq_desc + irq;
do {
if (mask & 1)
desc_handle_irq(irq, desc);
irq++;
desc++;
mask >>= 1;
} while (mask);
loop = 1;
}
mask = GEDR3 & GPIO_IRQ_mask[3];
if (mask) {
GEDR3 = mask;
irq = IRQ_GPIO(96);
desc = irq_desc + irq;
do {
if (mask & 1)
desc_handle_irq(irq, desc);
irq++;
desc++;
mask >>= 1;
} while (mask);
loop = 1;
bit = find_next_bit(gedr, GEDR_BITS, bit + 1);
}
} while (loop);
}