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authoreric miao <eric.miao@marvell.com>2008-03-04 10:57:18 +0800
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-19 11:29:03 +0100
commit7a26d3a33fd9adcbfd4fa2ca2d7e8a8272817935 (patch)
tree2e0aac15ed22525880dcf35f23cd60f7bd098a96 /arch/arm/mach-pxa/irq.c
parentd72b1370b0b45f1fabda5ae4d603773d8a2c226a (diff)
[ARM] pxa: generalize the muxed gpio IRQ handling code with loop and ffs()
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>
Diffstat (limited to 'arch/arm/mach-pxa/irq.c')
-rw-r--r--arch/arm/mach-pxa/irq.c74
1 files changed, 16 insertions, 58 deletions
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 36c6a68beca..381fde66aee 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -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 {
- loop = 0;
+ 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];
- 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);
- loop = 1;
- }
+ GEDR0 = gedr[0]; GEDR1 = gedr[1];
+ GEDR2 = gedr[2]; GEDR3 = gedr[3];
- 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 = 0;
+ bit = find_first_bit(gedr, GEDR_BITS);
+ while (bit < GEDR_BITS) {
loop = 1;
- }
- 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;
- }
+ n = PXA_GPIO_IRQ_BASE + bit;
+ desc_handle_irq(n, irq_desc + n);
- 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);
}