1 files changed, 117 insertions, 0 deletions
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/irq.c b/target/linux/adm8668/files/arch/mips/adm8668/irq.c
new file mode 100644
index 000000000..e048c15c8
--- /dev/null
+++ b/target/linux/adm8668/files/arch/mips/adm8668/irq.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/pm.h>
+#include <linux/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/irq_cpu.h>
+#include <asm/irq.h>
+#include <adm8668.h>
+
+static void adm8668_irq_cascade(void)
+{
+	int i;
+	unsigned long intsrc;
+
+	intsrc = ADM8668_INTC_REG(IRQ_STATUS_REG) & IRQ_MASK;
+	for (i = 0; intsrc; intsrc >>= 1, i++)
+		if (intsrc & 0x1)
+			do_IRQ(i);
+}
+
+/*
+ * System irq dispatch
+ */
+void plat_irq_dispatch(void)
+{
+	unsigned int pending;
+
+	pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+	/* timer interrupt, that we renumbered */
+	if (pending & STATUSF_IP7)
+		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+	if (pending & STATUSF_IP2)
+		adm8668_irq_cascade();
+}
+
+/*
+ * enable 8668 irq
+ */
+static void enable_adm8668_irq(struct irq_data *d)
+{
+	int irq = d->irq;
+
+	if ((irq < 0) || (irq > NR_IRQS))
+		return;
+
+	ADM8668_INTC_REG(IRQ_ENABLE_REG) = (1 << irq);
+}
+
+
+/*
+ * disable 8668 irq
+ */
+static void disable_adm8668_irq(struct irq_data *d)
+{
+	int irq = d->irq;
+
+	if ((irq < 0) || (irq > NR_IRQS))
+		return;
+
+	ADM8668_INTC_REG(IRQ_DISABLE_REG) = (1 << irq);
+}
+
+static void ack_adm8668_irq(struct irq_data *d)
+{
+	int irq = d->irq;
+
+	ADM8668_INTC_REG(IRQ_DISABLE_REG) = (1 << irq);
+}
+
+/*
+ * system irq type
+ */
+
+static struct irq_chip adm8668_irq_type = {
+	.name = "adm8668",
+	.irq_ack = ack_adm8668_irq,
+	.irq_mask = disable_adm8668_irq,
+	.irq_unmask = enable_adm8668_irq
+};
+
+/*
+ * irq init
+ */
+static void __init init_adm8668_irqs(void)
+{
+	int i;
+
+	for (i = 0; i <= INT_LVL_MAX; i++)
+		irq_set_chip_and_handler(i, &adm8668_irq_type,
+			handle_level_irq);
+
+	/* hw0 is where our interrupts are uh.. interrupted at. */
+	set_c0_status(IE_IRQ0);
+}
+
+/*
+ * system init
+ */
+void __init arch_init_irq(void)
+{
+	mips_cpu_irq_init();
+	init_adm8668_irqs();
+}