Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mach-iop32x / irq.c

diff --git a/kernel/arch/arm/mach-iop32x/irq.c b/kernel/arch/arm/mach-iop32x/irq.c
new file mode 100644 (file)
index 0000000..d7ee278
--- /dev/null
+++ b/kernel/arch/arm/mach-iop32x/irq.c
@@ -0,0 +1,74 @@
+/*
+ * arch/arm/mach-iop32x/irq.c
+ *
+ * Generic IOP32X IRQ handling functionality
+ *
+ * Author: Rory Bolt <rorybolt@pacbell.net>
+ * Copyright (C) 2002 Rory Bolt
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <asm/mach/irq.h>
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <asm/mach-types.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 void
+iop32x_irq_mask(struct irq_data *d)
+{
+       iop32x_mask &= ~(1 << d->irq);
+       intctl_write(iop32x_mask);
+}
+
+static void
+iop32x_irq_unmask(struct irq_data *d)
+{
+       iop32x_mask |= 1 << d->irq;
+       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,
+};
+
+void __init iop32x_init_irq(void)
+{
+       int i;
+
+       iop_init_cp6_handler();
+
+       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 = 0; i < NR_IRQS; i++) {
+               irq_set_chip_and_handler(i, &ext_chip, handle_level_irq);
+               set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+       }
+}