[PATCH v2 01/16] MIPS: Provide a generic plat_irq_dispatch

[Andrew Bresticker <abrestic-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>]

For platforms which boot with device-tree and use the MIPS CPU interrupt
controller binding, a generic plat_irq_dispatch() can be used since all
CPU interrupts should be mapped through the CPU IRQ domain.  Implement a
plat_irq_dispatch() which simply handles the highest pending interrupt.

Signed-off-by: Andrew Bresticker <abrestic-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Tested-by: Jonas Gorski <jogo-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
---
No changes from v1.
---
 arch/mips/kernel/irq_cpu.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/arch/mips/kernel/irq_cpu.c b/arch/mips/kernel/irq_cpu.c
index e498f2b..9cf8459 100644
--- a/arch/mips/kernel/irq_cpu.c
+++ b/arch/mips/kernel/irq_cpu.c
@@ -116,6 +116,24 @@ void __init mips_cpu_irq_init(void)
 }
 
 #ifdef CONFIG_IRQ_DOMAIN
+static struct irq_domain *mips_intc_domain;
+
+asmlinkage void __weak plat_irq_dispatch(void)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+	unsigned int hw;
+	int irq;
+
+	if (!pending) {
+		spurious_interrupt();
+		return;
+	}
+
+	hw = fls(pending) - CAUSEB_IP - 1;
+	irq = irq_linear_revmap(mips_intc_domain, hw);
+	do_IRQ(irq);
+}
+
 static int mips_cpu_intc_map(struct irq_domain *d, unsigned int irq,
 			     irq_hw_number_t hw)
 {
@@ -141,15 +159,15 @@ static const struct irq_domain_ops mips_cpu_intc_irq_domain_ops = {
 int __init mips_cpu_intc_init(struct device_node *of_node,
 			      struct device_node *parent)
 {
-	struct irq_domain *domain;
-
 	/* Mask interrupts. */
 	clear_c0_status(ST0_IM);
 	clear_c0_cause(CAUSEF_IP);
 
-	domain = irq_domain_add_legacy(of_node, 8, MIPS_CPU_IRQ_BASE, 0,
-				       &mips_cpu_intc_irq_domain_ops, NULL);
-	if (!domain)
+	mips_intc_domain = irq_domain_add_legacy(of_node, 8,
+						 MIPS_CPU_IRQ_BASE, 0,
+						 &mips_cpu_intc_irq_domain_ops,
+						 NULL);
+	if (!mips_intc_domain)
 		panic("Failed to add irqdomain for MIPS CPU");
 
 	return 0;
-- 
2.1.0.rc2.206.gedb03e5

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