1 files changed, 95 insertions, 0 deletions
diff --git a/arch/arm/mach-iop32x/irq.c b/arch/arm/mach-iop32x/irq.c
new file mode 100644
index 000000000..6dca7e97d
--- /dev/null
+++ b/arch/arm/mach-iop32x/irq.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/arm/mach-iop32x/irq.c
+ *
+ * Generic IOP32X IRQ handling functionality
+ *
+ * Author: Rory Bolt <rorybolt@pacbell.net>
+ * Copyright (C) 2002 Rory Bolt
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <asm/mach/irq.h>
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+
+#include "hardware.h"
+
+static u32 iop32x_mask;
+
+static void intctl_write(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c0, c0, 0" : : "r" (val));
+}
+
+static void intstr_write(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
+}
+
+static u32 iintsrc_read(void)
+{
+	int irq;
+
+	asm volatile("mrc p6, 0, %0, c8, c0, 0" : "=r" (irq));
+
+	return irq;
+}
+
+static void
+iop32x_irq_mask(struct irq_data *d)
+{
+	iop32x_mask &= ~(1 << (d->irq - 1));
+	intctl_write(iop32x_mask);
+}
+
+static void
+iop32x_irq_unmask(struct irq_data *d)
+{
+	iop32x_mask |= 1 << (d->irq - 1);
+	intctl_write(iop32x_mask);
+}
+
+struct irq_chip ext_chip = {
+	.name		= "IOP32x",
+	.irq_ack	= iop32x_irq_mask,
+	.irq_mask	= iop32x_irq_mask,
+	.irq_unmask	= iop32x_irq_unmask,
+};
+
+static void iop_handle_irq(struct pt_regs *regs)
+{
+	u32 mask;
+
+	iop_enable_cp6();
+
+	do {
+		mask = iintsrc_read();
+		if (mask)
+			generic_handle_irq(fls(mask));
+	} while (mask);
+}
+
+void __init iop32x_init_irq(void)
+{
+	int i;
+
+	iop_init_cp6_handler();
+	set_handle_irq(iop_handle_irq);
+
+	intctl_write(0);
+	intstr_write(0);
+	if (machine_is_glantank() ||
+	    machine_is_iq80321() ||
+	    machine_is_iq31244() ||
+	    machine_is_n2100() ||
+	    machine_is_em7210())
+		*IOP3XX_PCIIRSR = 0x0f;
+
+	for (i = 1; i < NR_IRQS; i++) {
+		irq_set_chip_and_handler(i, &ext_chip, handle_level_irq);
+		irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
+	}
+}