1 files changed, 94 insertions, 0 deletions
diff --git a/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c b/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c
new file mode 100644
index 0000000..d1cab68
--- /dev/null
+++ b/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c
@@ -0,0 +1,94 @@
+/*
+ * Moschip MCS814x generic interrupt controller routines
+ *
+ * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
+ *
+ * Licensed under the GPLv2
+ */
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/irqdomain.h>
+
+#include <asm/exception.h>
+#include <asm/mach/irq.h>
+#include <mach/mcs814x.h>
+
+static void __iomem *mcs814x_intc_base;
+static struct irq_domain *domain;
+
+static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
+					unsigned int num)
+{
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+
+	if (irq_alloc_domain_generic_chips(domain, num, 1, "mcs814x-intc", handle_level_irq,
+                IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST, 0))
+		panic("unable to allocate domain generic irq chip");
+
+	gc = irq_get_domain_generic_chip(domain, irq_start);
+	if (!gc)
+		panic("unable to get generic irq chip");
+
+	gc->reg_base = base;
+	ct = gc->chip_types;
+	ct->chip.irq_ack = irq_gc_unmask_enable_reg;
+	ct->chip.irq_mask = irq_gc_mask_clr_bit;
+	ct->chip.irq_unmask = irq_gc_mask_set_bit;
+	ct->regs.mask = MCS814X_IRQ_MASK;
+	ct->regs.enable = MCS814X_IRQ_ICR;
+
+	/* Clear all interrupts */
+	writel_relaxed(0xffffffff, base + MCS814X_IRQ_ICR);
+}
+
+asmlinkage void __exception_irq_entry mcs814x_handle_irq(struct pt_regs *regs)
+{
+	u32 status, irq;
+
+	do {
+		/* read the status register */
+		status = __raw_readl(mcs814x_intc_base + MCS814X_IRQ_STS0);
+		if (!status)
+			break;
+
+		irq = ffs(status) - 1;
+		status |= (1 << irq);
+		/* clear the interrupt */
+		__raw_writel(status, mcs814x_intc_base + MCS814X_IRQ_STS0);
+		/* call the generic handler */
+		handle_domain_irq(domain, irq, regs);
+
+	} while (1);
+}
+
+static const struct of_device_id mcs814x_intc_ids[] = {
+	{ .compatible = "moschip,mcs814x-intc" },
+	{ /* sentinel */ },
+};
+
+void __init mcs814x_of_irq_init(void)
+{
+	struct device_node *np;
+
+	np = of_find_matching_node(NULL, mcs814x_intc_ids);
+	if (!np)
+		panic("unable to find compatible intc node in dtb\n");
+
+	mcs814x_intc_base = of_iomap(np, 0);
+	if (!mcs814x_intc_base)
+		panic("unable to map intc cpu registers\n");
+
+	domain = irq_domain_add_linear(np, 32, &irq_generic_chip_ops, NULL);
+	if (!domain)
+		panic("unable to add irq domain\n");
+	irq_set_default_host(domain);
+
+	of_node_put(np);
+
+	mcs814x_alloc_gc(mcs814x_intc_base, 0, 32);
+}
+