linux-kernel - [PATCH v2 15/16] MIPS: GIC: Use local interrupts for timer

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Date:	Fri,  5 Sep 2014 10:30:17 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	Jeffrey Deans <jeffrey.deans@...tec.com>,
	Markos Chandras <markos.chandras@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Arnd Bergmann <arnd@...db.de>,
	John Crispin <blogic@...nwrt.org>,
	David Daney <ddaney.cavm@...il.com>, linux-mips@...ux-mips.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 15/16] MIPS: GIC: Use local interrupts for timer

Instead of using GIC interrupt 0 for the timer (which was not even
handled correctly by the GIC irqchip code and could conflict with an
actual external interrupt), use the designated local interrupt for
the GIC timer.

Also, since the timer is a per-CPU interrupt, initialize it with
setup_percpu_irq() and enable it with enable_percpu_irq() instead
of using direct register writes.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
---
No changes from v1.
---
 arch/mips/kernel/cevt-gic.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/mips/kernel/cevt-gic.c b/arch/mips/kernel/cevt-gic.c
index 6093716..cae72a4 100644
--- a/arch/mips/kernel/cevt-gic.c
+++ b/arch/mips/kernel/cevt-gic.c
@@ -68,7 +68,7 @@ int gic_clockevent_init(void)
 	if (!cpu_has_counter || !gic_frequency)
 		return -ENXIO;
 
-	irq = MIPS_GIC_IRQ_BASE;
+	irq = MIPS_GIC_LOCAL_IRQ_BASE + GIC_LOCAL_INTR_COMPARE;
 
 	cd = &per_cpu(gic_clockevent_device, cpu);
 
@@ -91,15 +91,13 @@ int gic_clockevent_init(void)
 
 	clockevents_register_device(cd);
 
-	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_MAP), 0x80000002);
-	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), GIC_VPE_SMASK_CMP_MSK);
+	if (!gic_timer_irq_installed) {
+		setup_percpu_irq(irq, &gic_compare_irqaction);
+		irq_set_handler(irq, handle_percpu_irq);
+		gic_timer_irq_installed = 1;
+	}
 
-	if (gic_timer_irq_installed)
-		return 0;
+	enable_percpu_irq(irq, 0);
 
-	gic_timer_irq_installed = 1;
-
-	setup_irq(irq, &gic_compare_irqaction);
-	irq_set_handler(irq, handle_percpu_irq);
 	return 0;
 }
-- 
2.1.0.rc2.206.gedb03e5

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