From 0771c6939484d2ebe0ec28257c2570aecd9911e0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Krzysztof=20Ha=C5=82asa?= Date: Tue, 28 Apr 2009 19:32:55 +0200 Subject: IXP42x: Use __fls() in QMgr interrupt handlers. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Krzysztof Hałasa --- arch/arm/mach-ixp4xx/ixp4xx_qmgr.c | 35 ++++++++++++++++++++--------------- 1 file changed, 20 insertions(+), 15 deletions(-) (limited to 'arch/arm/mach-ixp4xx') diff --git a/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c b/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c index 6e6dc4c78a10..bfdbe4b5a3cc 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; } -- cgit v1.2.3