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Diffstat (limited to 'kernel/arch/sh/boards/mach-se/7724/irq.c')
-rw-r--r--kernel/arch/sh/boards/mach-se/7724/irq.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/kernel/arch/sh/boards/mach-se/7724/irq.c b/kernel/arch/sh/boards/mach-se/7724/irq.c
new file mode 100644
index 000000000..5d1d3ec9a
--- /dev/null
+++ b/kernel/arch/sh/boards/mach-se/7724/irq.c
@@ -0,0 +1,145 @@
+/*
+ * 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 <linux/export.h>
+#include <linux/topology.h>
+#include <linux/io.h>
+#include <linux/err.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(struct irq_data *data)
+{
+ unsigned int irq = data->irq;
+ struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
+ unsigned int bit = irq - set.base;
+ __raw_writew(__raw_readw(set.mraddr) | 0x0001 << bit, set.mraddr);
+}
+
+static void enable_se7724_irq(struct irq_data *data)
+{
+ unsigned int irq = data->irq;
+ struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
+ unsigned int bit = irq - set.base;
+ __raw_writew(__raw_readw(set.mraddr) & ~(0x0001 << bit), set.mraddr);
+}
+
+static struct irq_chip se7724_irq_chip __read_mostly = {
+ .name = "SE7724-FPGA",
+ .irq_mask = disable_se7724_irq,
+ .irq_unmask = enable_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 = __raw_readw(set.sraddr);
+ unsigned int ext_irq = set.base;
+
+ intv &= set.mask;
+
+ for (; intv; intv >>= 1, ext_irq++) {
+ if (!(intv & 1))
+ continue;
+
+ generic_handle_irq(ext_irq);
+ }
+}
+
+/*
+ * Initialize IRQ setting
+ */
+void __init init_se7724_IRQ(void)
+{
+ int irq_base, i;
+
+ __raw_writew(0xffff, IRQ0_MR); /* mask all */
+ __raw_writew(0xffff, IRQ1_MR); /* mask all */
+ __raw_writew(0xffff, IRQ2_MR); /* mask all */
+ __raw_writew(0x0000, IRQ0_SR); /* clear irq */
+ __raw_writew(0x0000, IRQ1_SR); /* clear irq */
+ __raw_writew(0x0000, IRQ2_SR); /* clear irq */
+ __raw_writew(0x002a, IRQ_MODE); /* set irq type */
+
+ irq_base = irq_alloc_descs(SE7724_FPGA_IRQ_BASE, SE7724_FPGA_IRQ_BASE,
+ SE7724_FPGA_IRQ_NR, numa_node_id());
+ if (IS_ERR_VALUE(irq_base)) {
+ pr_err("%s: failed hooking irqs for FPGA\n", __func__);
+ return;
+ }
+
+ for (i = 0; i < SE7724_FPGA_IRQ_NR; i++)
+ irq_set_chip_and_handler_name(irq_base + i, &se7724_irq_chip,
+ handle_level_irq, "level");
+
+ irq_set_chained_handler(IRQ0_IRQ, se7724_irq_demux);
+ irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
+
+ irq_set_chained_handler(IRQ1_IRQ, se7724_irq_demux);
+ irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
+
+ irq_set_chained_handler(IRQ2_IRQ, se7724_irq_demux);
+ irq_set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW);
+}