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From 85f7cdacbb81db8c4cc8e474837eab1f0e4ff77b Mon Sep 17 00:00:00 2001
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From: Andrew Bresticker <abrestic@chromium.org>
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Date: Thu, 18 Sep 2014 14:47:09 -0700
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Subject: [PATCH 3/3] MIPS: Provide a generic plat_irq_dispatch
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For platforms which boot with device-tree or have correctly chained
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all external interrupt controllers, a generic plat_irq_dispatch() can
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be used. Implement a plat_irq_dispatch() which simply handles all the
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pending interrupts as reported by C0_Cause.
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Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
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Reviewed-by: Qais Yousef <qais.yousef@imgtec.com>
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Tested-by: Qais Yousef <qais.yousef@imgtec.com>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: Jason Cooper <jason@lakedaemon.net>
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Cc: Andrew Bresticker <abrestic@chromium.org>
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Cc: Jeffrey Deans <jeffrey.deans@imgtec.com>
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Cc: Markos Chandras <markos.chandras@imgtec.com>
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Cc: Paul Burton <paul.burton@imgtec.com>
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Cc: Qais Yousef <qais.yousef@imgtec.com>
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Cc: Jonas Gorski <jogo@openwrt.org>
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Cc: John Crispin <blogic@openwrt.org>
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Cc: David Daney <ddaney.cavm@gmail.com>
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Cc: linux-mips@linux-mips.org
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Cc: linux-kernel@vger.kernel.org
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Patchwork: https://patchwork.linux-mips.org/patch/7801/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/kernel/irq_cpu.c | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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--- a/arch/mips/kernel/irq_cpu.c
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+++ b/arch/mips/kernel/irq_cpu.c
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@@ -98,6 +98,24 @@ static struct irq_chip mips_mt_cpu_irq_c
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.irq_enable = unmask_mips_irq,
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};
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+asmlinkage void __weak plat_irq_dispatch(void)
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+{
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+ unsigned long pending = read_c0_cause() & read_c0_status() & ST0_IM;
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+ int irq;
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+
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+ if (!pending) {
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+ spurious_interrupt();
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+ return;
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+ }
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+
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+ pending >>= CAUSEB_IP;
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+ while (pending) {
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+ irq = fls(pending) - 1;
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+ do_IRQ(MIPS_CPU_IRQ_BASE + irq);
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+ pending &= ~BIT(irq);
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+ }
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+}
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+
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static int mips_cpu_intc_map(struct irq_domain *d, unsigned int irq,
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irq_hw_number_t hw)
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{
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