samsung update 1

1 files changed, 76 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/irq-sgi.c b/arch/arm/mach-exynos/irq-sgi.c
new file mode 100644
index 00000000000..ca5973ceb09
--- /dev/null
+++ b/arch/arm/mach-exynos/irq-sgi.c
@@ -0,0 +1,76 @@
+/* linux/arch/arm/mach-exynos/irq-sgi.c
+ *
+ * Copyright (c) 2011 Gisecke & Devrient
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *
+ * Based on linux/arch/arm/plat-s5p/irq-eint.c
+ *
+ * EXYNOS - Software Generated Interrupts Dummy chip support
+ *
+ * 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/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/regs-irq.h>
+
+static inline void exynos_irq_sgi_mask(struct irq_data *d)
+{
+	/* Do nothing, because SGIs are always enabled. */
+}
+
+static void exynos_irq_sgi_unmask(struct irq_data *d)
+{
+	/* Do nothing, because SGIs are always enabled. */
+}
+
+static inline void exynos_irq_sgi_eoi(struct irq_data *d)
+{
+	unsigned int irq = (d->irq - S5P_IRQ_OFFSET);
+
+	writel(irq, S5P_VA_GIC_CPU + GIC_CPU_EOI);
+}
+
+static int exynos_irq_sgi_set_type(struct irq_data *d, unsigned int type)
+{
+	return 0;
+}
+
+static struct irq_chip exynos_irq_sgi = {
+	.name		= "exynos_sgi",
+	.irq_mask	= exynos_irq_sgi_mask,
+	.irq_unmask	= exynos_irq_sgi_unmask,
+	.irq_eoi	= exynos_irq_sgi_eoi,
+	.irq_set_type	= exynos_irq_sgi_set_type,
+};
+
+/*
+ * exynos_init_irq_sgi
+ *
+ * Setup the SGI IRQ to a dummy GIC. The interrupts use the same id
+ * as provided by get_irqnr_and_base, no demuxing is necesarry but
+ * we are handling the last 8 SGIs as normal interrupts in
+ * get_irqnr_and_base.
+ *
+ * NOTE: SGIs are bound to the CPU for which they have been generated
+ * so use with care.
+ */
+int __init exynos_init_irq_sgi(void)
+{
+	int irq;
+
+	for (irq = 8; irq <= 15; irq++) {
+		irq_set_chip_and_handler(IRQ_SGI(irq), &exynos_irq_sgi, handle_fasteoi_irq);
+		set_irq_flags(IRQ_SGI(irq), IRQF_VALID);
+	}
+
+	return 0;
+}
+
+arch_initcall(exynos_init_irq_sgi);