1 files changed, 76 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-se/7722/irq.c b/arch/sh/boards/mach-se/7722/irq.c
new file mode 100644
index 000000000000..02d21a3e2a8f
--- /dev/null
+++ b/arch/sh/boards/mach-se/7722/irq.c
@@ -0,0 +1,76 @@
+/*
+ * linux/arch/sh/boards/se/7722/irq.c
+ *
+ * Copyright (C) 2007  Nobuhiro Iwamatsu
+ *
+ * Hitachi UL SolutionEngine 7722 Support.
+ *
+ * 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/irq.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <mach-se/mach/se7722.h>
+
+static void disable_se7722_irq(unsigned int irq)
+{
+	unsigned int bit = irq - SE7722_FPGA_IRQ_BASE;
+	ctrl_outw(ctrl_inw(IRQ01_MASK) | 1 << bit, IRQ01_MASK);
+}
+
+static void enable_se7722_irq(unsigned int irq)
+{
+	unsigned int bit = irq - SE7722_FPGA_IRQ_BASE;
+	ctrl_outw(ctrl_inw(IRQ01_MASK) & ~(1 << bit), IRQ01_MASK);
+}
+
+static struct irq_chip se7722_irq_chip __read_mostly = {
+	.name           = "SE7722-FPGA",
+	.mask           = disable_se7722_irq,
+	.unmask         = enable_se7722_irq,
+	.mask_ack       = disable_se7722_irq,
+};
+
+static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc)
+{
+	unsigned short intv = ctrl_inw(IRQ01_STS);
+	struct irq_desc *ext_desc;
+	unsigned int ext_irq = SE7722_FPGA_IRQ_BASE;
+
+	intv &= (1 << SE7722_FPGA_IRQ_NR) - 1;
+
+	while (intv) {
+		if (intv & 1) {
+			ext_desc = irq_desc + ext_irq;
+			handle_level_irq(ext_irq, ext_desc);
+		}
+		intv >>= 1;
+		ext_irq++;
+	}
+}
+
+/*
+ * Initialize IRQ setting
+ */
+void __init init_se7722_IRQ(void)
+{
+	int i;
+
+	ctrl_outw(0, IRQ01_MASK);       /* disable all irqs */
+	ctrl_outw(0x2000, 0xb03fffec);  /* mrshpc irq enable */
+
+	for (i = 0; i < SE7722_FPGA_IRQ_NR; i++)
+		set_irq_chip_and_handler_name(SE7722_FPGA_IRQ_BASE + i,
+					      &se7722_irq_chip,
+					      handle_level_irq, "level");
+
+	set_irq_chained_handler(IRQ0_IRQ, se7722_irq_demux);
+	set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
+
+	set_irq_chained_handler(IRQ1_IRQ, se7722_irq_demux);
+	set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
+}