1 files changed, 139 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-se/7724/irq.c b/arch/sh/boards/mach-se/7724/irq.c
new file mode 100644
index 00000000000..f76cf3b49f2
--- /dev/null
+++ b/arch/sh/boards/mach-se/7724/irq.c
@@ -0,0 +1,139 @@
+/*
+ * linux/arch/sh/boards/se/7724/irq.c
+ *
+ * Copyright (C) 2009 Renesas Solutions Corp.
+ *
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * Based on  linux/arch/sh/boards/se/7722/irq.c
+ * Copyright (C) 2007  Nobuhiro Iwamatsu
+ *
+ * Hitachi UL SolutionEngine 7724 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/se7724.h>
+
+struct fpga_irq {
+	unsigned long  sraddr;
+	unsigned long  mraddr;
+	unsigned short mask;
+	unsigned int   base;
+};
+
+static unsigned int fpga2irq(unsigned int irq)
+{
+	if (irq >= IRQ0_BASE &&
+	    irq <= IRQ0_END)
+		return IRQ0_IRQ;
+	else if (irq >= IRQ1_BASE &&
+		 irq <= IRQ1_END)
+		return IRQ1_IRQ;
+	else
+		return IRQ2_IRQ;
+}
+
+static struct fpga_irq get_fpga_irq(unsigned int irq)
+{
+	struct fpga_irq set;
+
+	switch (irq) {
+	case IRQ0_IRQ:
+		set.sraddr = IRQ0_SR;
+		set.mraddr = IRQ0_MR;
+		set.mask   = IRQ0_MASK;
+		set.base   = IRQ0_BASE;
+		break;
+	case IRQ1_IRQ:
+		set.sraddr = IRQ1_SR;
+		set.mraddr = IRQ1_MR;
+		set.mask   = IRQ1_MASK;
+		set.base   = IRQ1_BASE;
+		break;
+	default:
+		set.sraddr = IRQ2_SR;
+		set.mraddr = IRQ2_MR;
+		set.mask   = IRQ2_MASK;
+		set.base   = IRQ2_BASE;
+		break;
+	}
+
+	return set;
+}
+
+static void disable_se7724_irq(unsigned int irq)
+{
+	struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
+	unsigned int bit = irq - set.base;
+	ctrl_outw(ctrl_inw(set.mraddr) | 0x0001 << bit, set.mraddr);
+}
+
+static void enable_se7724_irq(unsigned int irq)
+{
+	struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
+	unsigned int bit = irq - set.base;
+	ctrl_outw(ctrl_inw(set.mraddr) & ~(0x0001 << bit), set.mraddr);
+}
+
+static struct irq_chip se7724_irq_chip __read_mostly = {
+	.name           = "SE7724-FPGA",
+	.mask           = disable_se7724_irq,
+	.unmask         = enable_se7724_irq,
+	.mask_ack       = disable_se7724_irq,
+};
+
+static void se7724_irq_demux(unsigned int irq, struct irq_desc *desc)
+{
+	struct fpga_irq set = get_fpga_irq(irq);
+	unsigned short intv = ctrl_inw(set.sraddr);
+	struct irq_desc *ext_desc;
+	unsigned int ext_irq = set.base;
+
+	intv &= set.mask;
+
+	while (intv) {
+		if (intv & 0x0001) {
+			ext_desc = irq_desc + ext_irq;
+			handle_level_irq(ext_irq, ext_desc);
+		}
+		intv >>= 1;
+		ext_irq++;
+	}
+}
+
+/*
+ * Initialize IRQ setting
+ */
+void __init init_se7724_IRQ(void)
+{
+	int i;
+
+	ctrl_outw(0xffff, IRQ0_MR);  /* mask all */
+	ctrl_outw(0xffff, IRQ1_MR);  /* mask all */
+	ctrl_outw(0xffff, IRQ2_MR);  /* mask all */
+	ctrl_outw(0x0000, IRQ0_SR);  /* clear irq */
+	ctrl_outw(0x0000, IRQ1_SR);  /* clear irq */
+	ctrl_outw(0x0000, IRQ2_SR);  /* clear irq */
+	ctrl_outw(0x002a, IRQ_MODE); /* set irq type */
+
+	for (i = 0; i < SE7724_FPGA_IRQ_NR; i++)
+		set_irq_chip_and_handler_name(SE7724_FPGA_IRQ_BASE + i,
+					      &se7724_irq_chip,
+					      handle_level_irq, "level");
+
+	set_irq_chained_handler(IRQ0_IRQ, se7724_irq_demux);
+	set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
+
+	set_irq_chained_handler(IRQ1_IRQ, se7724_irq_demux);
+	set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
+
+	set_irq_chained_handler(IRQ2_IRQ, se7724_irq_demux);
+	set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW);
+}