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authorKrzysztof Hałasa <khc@pm.waw.pl>2009-04-28 19:32:55 +0200
committerKrzysztof Hałasa <khc@pm.waw.pl>2009-05-23 23:37:04 +0200
commit0771c6939484d2ebe0ec28257c2570aecd9911e0 (patch)
treee66e640986fcf3a8201a82203a1728f6d366c791 /arch/arm
parentd4c9e9fc97515588529e7fe48c7d5725292c6734 (diff)
IXP42x: Use __fls() in QMgr interrupt handlers.
Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-ixp4xx/ixp4xx_qmgr.c35
1 files changed, 20 insertions, 15 deletions
diff --git a/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c b/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c
index 6e6dc4c78a1..bfdbe4b5a3c 100644
--- a/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c
+++ b/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c
@@ -52,14 +52,15 @@ void qmgr_set_irq(unsigned int queue, int src,
static irqreturn_t qmgr_irq1_a0(int irq, void *pdev)
{
int i, ret = 0;
+ u32 en_bitmap, src, stat;
/* ACK - it may clear any bits so don't rely on it */
__raw_writel(0xFFFFFFFF, &qmgr_regs->irqstat[0]);
- for (i = 0; i < HALF_QUEUES; i++) {
- u32 src, stat;
- if (!(qmgr_regs->irqen[0] & BIT(i)))
- continue;
+ en_bitmap = qmgr_regs->irqen[0];
+ while (en_bitmap) {
+ i = __fls(en_bitmap); /* number of the last "low" queue */
+ en_bitmap &= ~BIT(i);
src = qmgr_regs->irqsrc[i >> 3];
stat = qmgr_regs->stat1[i >> 3];
if (src & 4) /* the IRQ condition is inverted */
@@ -82,9 +83,9 @@ static irqreturn_t qmgr_irq2_a0(int irq, void *pdev)
__raw_writel(0xFFFFFFFF, &qmgr_regs->irqstat[1]);
req_bitmap = qmgr_regs->irqen[1] & qmgr_regs->statne_h;
- for (i = 0; i < HALF_QUEUES; i++) {
- if (!(req_bitmap & BIT(i)))
- continue;
+ while (req_bitmap) {
+ i = __fls(req_bitmap); /* number of the last "high" queue */
+ req_bitmap &= ~BIT(i);
irq_handlers[HALF_QUEUES + i](irq_pdevs[HALF_QUEUES + i]);
ret = IRQ_HANDLED;
}
@@ -95,15 +96,19 @@ static irqreturn_t qmgr_irq2_a0(int irq, void *pdev)
static irqreturn_t qmgr_irq(int irq, void *pdev)
{
int i, half = (irq == IRQ_IXP4XX_QM1 ? 0 : 1);
- u32 val = __raw_readl(&qmgr_regs->irqstat[half]);
- __raw_writel(val, &qmgr_regs->irqstat[half]); /* ACK */
+ u32 req_bitmap = __raw_readl(&qmgr_regs->irqstat[half]);
- for (i = 0; i < HALF_QUEUES; i++)
- if (val & (1 << i)) {
- int irq = half * HALF_QUEUES + i;
- irq_handlers[irq](irq_pdevs[irq]);
- }
- return val ? IRQ_HANDLED : 0;
+ if (!req_bitmap)
+ return 0;
+ __raw_writel(req_bitmap, &qmgr_regs->irqstat[half]); /* ACK */
+
+ while (req_bitmap) {
+ i = __fls(req_bitmap); /* number of the last queue */
+ req_bitmap &= ~BIT(i);
+ i += half * HALF_QUEUES;
+ irq_handlers[i](irq_pdevs[i]);
+ }
+ return IRQ_HANDLED;
}