From: Noam Camus <noamc@ezchip.com>
To: <linux-snps-arc@lists.infradead.org>
CC: <linux-kernel@vger.kernel.org>, <cmetcalf@ezchip.com>,
        <daniel.lezcano@linaro.org>, <marc.zyngier@arm.com>,
        Noam Camus <noamc@ezchip.com>
Subject: [PATCH v5 10/20] ARC: IRQ: do not use hwirq directly at arch_do_IRQ()
Date: Sun, 27 Dec 2015 15:23:29 +0200
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From: Noam Camus <noamc@ezchip.com>

ARC uses hwirq at arch_do_IRQ() to pass into generic_handle_irq().
This is wrong since we need first to reverse map it into virq.

Happily, if we use handle_domain_irq() we get all we need.

Just like ARM I created a pointer to handler that should be filled
by an interrupt controller driver from driver/irqchip/

Signed-off-by: Noam Camus <noamc@ezchip.com>
---
 arch/arc/Kconfig           |    1 +
 arch/arc/include/asm/irq.h |    5 +++++
 arch/arc/kernel/irq.c      |   14 ++++++++++++++
 3 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 7be1020..079946e 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -32,6 +32,7 @@ config ARC
 	select HAVE_OPROFILE
 	select HAVE_PERF_EVENTS
 	select IRQ_DOMAIN
+	select HANDLE_DOMAIN_IRQ if ARC_PLAT_EZNPS
 	select MODULES_USE_ELF_RELA
 	select NO_BOOTMEM
 	select OF
diff --git a/arch/arc/include/asm/irq.h b/arch/arc/include/asm/irq.h
index c5f8f0f..64226c9 100644
--- a/arch/arc/include/asm/irq.h
+++ b/arch/arc/include/asm/irq.h
@@ -36,4 +36,9 @@ void arc_request_percpu_irq(int irq, int cpu,
                             irqreturn_t (*isr)(int irq, void *dev),
                             const char *irq_nm, void *percpu_dev);
 
+#ifdef CONFIG_HANDLE_DOMAIN_IRQ
+extern void set_handle_irq(void (*handle_irq)(unsigned int hwirq,
+					      struct pt_regs *));
+#endif
+
 #endif
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index ba17f85..7ae5411 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -41,6 +41,7 @@ void __init init_IRQ(void)
  * "C" Entry point for any ARC ISR, called from low level vector handler
  * @irq is the vector number read from ICAUSE reg of on-chip intc
  */
+#ifndef CONFIG_HANDLE_DOMAIN_IRQ
 void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
@@ -50,6 +51,19 @@ void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
 	irq_exit();
 	set_irq_regs(old_regs);
 }
+#else
+void (*handle_arch_irq)(unsigned int hwirq, struct pt_regs *) = NULL;
+void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+	handle_arch_irq(irq, regs);
+}
+
+void __init set_handle_irq(void (*handle_irq)(unsigned int hwirq,
+					      struct pt_regs *))
+{
+	handle_arch_irq = handle_irq;
+}
+#endif
 
 /*
  * API called for requesting percpu interrupts - called by each CPU
-- 
1.7.1

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