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From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 03/16] ARM: GIC: Add global gic_handle_irq() function
Date: Mon, 26 Sep 2011 12:02:22 +0100	[thread overview]
Message-ID: <1317034955-1029-4-git-send-email-marc.zyngier@arm.com> (raw)
In-Reply-To: <1317034955-1029-1-git-send-email-marc.zyngier@arm.com>

Provide the GIC code with a low level handler that can be used
by platforms using CONFIG_MULTI_IRQ_HANDLER. Though the handler is
written in C, the compiled code doesn't feel much slower than its
assembly counterpart (at least with my gcc 4.4.1).

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/common/gic.c               |   23 +++++++++++++++++++++++
 arch/arm/include/asm/hardware/gic.h |    1 +
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index a3f335c..5a22896 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -209,6 +209,29 @@ static int gic_set_wake(struct irq_data *d, unsigned int on)
 #define gic_set_wake	NULL
 #endif
 
+asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
+{
+	u32 irqstat, irqnr;
+
+	do {
+		irqstat = readl_relaxed(gic_cpu_base_addr + GIC_CPU_INTACK);
+		irqnr = irqstat & ~0x1c00;
+
+		if (likely(irqnr > 15 && irqnr < 1021)) {
+			handle_IRQ(irqnr, regs);
+			continue;
+		}
+		if (irqnr < 16) {
+			writel_relaxed(irqstat, gic_cpu_base_addr + GIC_CPU_EOI);
+#ifdef CONFIG_SMP
+			handle_IPI(irqnr, regs);
+#endif
+			continue;
+		}
+		break;
+	} while (1);
+}
+
 static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
 {
 	struct gic_chip_data *chip_data = irq_get_handler_data(irq);
diff --git a/arch/arm/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h
index 2dadd50..45e4ab4 100644
--- a/arch/arm/include/asm/hardware/gic.h
+++ b/arch/arm/include/asm/hardware/gic.h
@@ -38,6 +38,7 @@ extern struct irq_chip gic_arch_extn;
 
 void gic_init(unsigned int, unsigned int, void __iomem *, void __iomem *);
 void gic_secondary_init(unsigned int);
+void gic_handle_irq(struct pt_regs *regs);
 void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
 void gic_raise_softirq(const struct cpumask *mask, unsigned int irq);
 
-- 
1.7.0.4

  parent reply	other threads:[~2011-09-26 11:02 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-26 11:02 [PATCH v2 00/16] Switch GIC users (and omap2plus) to CONFIG_MULTI_IRQ_HANDLER Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 01/16] ARM: Make global handler and CONFIG_MULTI_IRQ_HANDLER mutually exclusive Marc Zyngier
2011-09-28  1:00   ` Tony Lindgren
2011-09-26 11:02 ` [PATCH v2 02/16] ARM: smp: Add an IPI handler callable from C code Marc Zyngier
2011-09-28  1:01   ` Tony Lindgren
2011-09-26 11:02 ` Marc Zyngier [this message]
2011-09-28  1:01   ` [PATCH v2 03/16] ARM: GIC: Add global gic_handle_irq() function Tony Lindgren
2011-09-26 11:02 ` [PATCH v2 04/16] ARM: RealView: convert to CONFIG_MULTI_IRQ_HANDLER Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 05/16] ARM: VExpress: " Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 06/16] ARM: msm: convert SMP platforms " Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 07/16] ARM: GIC: Add global gic_handle_irq_offset() function Marc Zyngier
2011-09-28 15:50   ` Rob Herring
2011-09-29  8:53     ` Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 08/16] ARM: exynos4: convert to CONFIG_MULTI_IRQ_HANDLER Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 09/16] ARM: tegra2: " Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 10/16] ARM: ux500: " Marc Zyngier
2011-09-27 11:47   ` Linus Walleij
2011-09-27 12:33     ` Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 11/16] ARM: shmobile: convert smp platforms to gic_handle_irq() Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 12/16] ARM: cns3xxx: convert to CONFIG_MULTI_IRQ_HANDLER Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 13/16] ARM: zynq: " Marc Zyngier
2011-09-26 11:02 ` [PATCH v2 14/16] ARM: omap2/3: Add global omap2/3_intc_handle_irq() functions Marc Zyngier
2011-09-28  1:02   ` Tony Lindgren
2011-09-26 11:02 ` [PATCH v2 15/16] ARM: omap2plus: convert to CONFIG_MULTI_IRQ_HANDLER Marc Zyngier
2011-09-28  1:04   ` Tony Lindgren
2011-09-26 11:02 ` [PATCH v2 16/16] ARM: GIC: Make MULTI_IRQ_HANDLER mandatory Marc Zyngier
2011-09-27  3:43   ` Shawn Guo
2011-09-27  8:32     ` Marc Zyngier
2011-09-27 10:19       ` Shawn Guo
2011-09-28  1:04   ` Tony Lindgren
2011-09-26 20:20 ` [PATCH v2 00/16] Switch GIC users (and omap2plus) to CONFIG_MULTI_IRQ_HANDLER David Brown
2011-09-27  0:15   ` David Brown
2011-09-27  8:58     ` Marc Zyngier
2011-09-27 10:20 ` Shawn Guo
2011-09-27 10:22   ` Marc Zyngier
2011-09-27 23:53 ` Tony Lindgren
2011-09-28  0:53   ` Tony Lindgren

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