MIPS: add irqdomain support for the CPU IRQ controller
Add code to load a irq_domain for the MIPS IRQ controller from a devicetree
file.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: David Daney <david.daney@cavium.com>
Patchwork: http://patchwork.linux-mips.org/patch/4902/
diff --git a/arch/mips/include/asm/irq_cpu.h b/arch/mips/include/asm/irq_cpu.h
index ef6a07c..3f11fdb 100644
--- a/arch/mips/include/asm/irq_cpu.h
+++ b/arch/mips/include/asm/irq_cpu.h
@@ -17,4 +17,10 @@
extern void rm7k_cpu_irq_init(void);
extern void rm9k_cpu_irq_init(void);
+#ifdef CONFIG_IRQ_DOMAIN
+struct device_node;
+extern int mips_cpu_intc_init(struct device_node *of_node,
+ struct device_node *parent);
+#endif
+
#endif /* _ASM_IRQ_CPU_H */
diff --git a/arch/mips/kernel/irq_cpu.c b/arch/mips/kernel/irq_cpu.c
index 972263b..49bc9ca 100644
--- a/arch/mips/kernel/irq_cpu.c
+++ b/arch/mips/kernel/irq_cpu.c
@@ -31,6 +31,7 @@
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
@@ -113,3 +114,44 @@
irq_set_chip_and_handler(i, &mips_cpu_irq_controller,
handle_percpu_irq);
}
+
+#ifdef CONFIG_IRQ_DOMAIN
+static int mips_cpu_intc_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ static struct irq_chip *chip;
+
+ if (hw < 2 && cpu_has_mipsmt) {
+ /* Software interrupts are used for MT/CMT IPI */
+ chip = &mips_mt_cpu_irq_controller;
+ } else {
+ chip = &mips_cpu_irq_controller;
+ }
+
+ irq_set_chip_and_handler(irq, chip, handle_percpu_irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops mips_cpu_intc_irq_domain_ops = {
+ .map = mips_cpu_intc_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+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)
+ panic("Failed to add irqdomain for MIPS CPU\n");
+
+ return 0;
+}
+#endif /* CONFIG_IRQ_DOMAIN */
