1 files changed, 119 insertions, 0 deletions

diff --git a/kernel/arch/sh/boards/mach-se/7722/irq.c b/kernel/arch/sh/boards/mach-se/7722/irq.c
new file mode 100644
index 000000000..00e699232
--- /dev/null
+++ b/kernel/arch/sh/boards/mach-se/7722/irq.c
@@ -0,0 +1,119 @@
+/*
+ * Hitachi UL SolutionEngine 7722 FPGA IRQ Support.
+ *
+ * Copyright (C) 2007  Nobuhiro Iwamatsu
+ * Copyright (C) 2012  Paul Mundt
+ *
+ * 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.
+ */
+#define DRV_NAME "SE7722-FPGA"
+#define pr_fmt(fmt) DRV_NAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <asm/sizes.h>
+#include <mach-se/mach/se7722.h>
+
+#define IRQ01_BASE_ADDR	0x11800000
+#define IRQ01_MODE_REG	0
+#define IRQ01_STS_REG	4
+#define IRQ01_MASK_REG	8
+
+static void __iomem *se7722_irq_regs;
+struct irq_domain *se7722_irq_domain;
+
+static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc)
+{
+	struct irq_data *data = irq_get_irq_data(irq);
+	struct irq_chip *chip = irq_data_get_irq_chip(data);
+	unsigned long mask;
+	int bit;
+
+	chip->irq_mask_ack(data);
+
+	mask = ioread16(se7722_irq_regs + IRQ01_STS_REG);
+
+	for_each_set_bit(bit, &mask, SE7722_FPGA_IRQ_NR)
+		generic_handle_irq(irq_linear_revmap(se7722_irq_domain, bit));
+
+	chip->irq_unmask(data);
+}
+
+static void __init se7722_domain_init(void)
+{
+	int i;
+
+	se7722_irq_domain = irq_domain_add_linear(NULL, SE7722_FPGA_IRQ_NR,
+						  &irq_domain_simple_ops, NULL);
+	if (unlikely(!se7722_irq_domain)) {
+		printk("Failed to get IRQ domain\n");
+		return;
+	}
+
+	for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) {
+		int irq = irq_create_mapping(se7722_irq_domain, i);
+
+		if (unlikely(irq == 0)) {
+			printk("Failed to allocate IRQ %d\n", i);
+			return;
+		}
+	}
+}
+
+static void __init se7722_gc_init(void)
+{
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	unsigned int irq_base;
+
+	irq_base = irq_linear_revmap(se7722_irq_domain, 0);
+
+	gc = irq_alloc_generic_chip(DRV_NAME, 1, irq_base, se7722_irq_regs,
+				    handle_level_irq);
+	if (unlikely(!gc))
+		return;
+
+	ct = gc->chip_types;
+	ct->chip.irq_mask = irq_gc_mask_set_bit;
+	ct->chip.irq_unmask = irq_gc_mask_clr_bit;
+
+	ct->regs.mask = IRQ01_MASK_REG;
+
+	irq_setup_generic_chip(gc, IRQ_MSK(SE7722_FPGA_IRQ_NR),
+			       IRQ_GC_INIT_MASK_CACHE,
+			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+
+	irq_set_chained_handler(IRQ0_IRQ, se7722_irq_demux);
+	irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
+
+	irq_set_chained_handler(IRQ1_IRQ, se7722_irq_demux);
+	irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
+}
+
+/*
+ * Initialize FPGA IRQs
+ */
+void __init init_se7722_IRQ(void)
+{
+	se7722_irq_regs = ioremap(IRQ01_BASE_ADDR, SZ_16);
+	if (unlikely(!se7722_irq_regs)) {
+		printk("Failed to remap IRQ01 regs\n");
+		return;
+	}
+
+	/*
+	 * All FPGA IRQs disabled by default
+	 */
+	iowrite16(0, se7722_irq_regs + IRQ01_MASK_REG);
+
+	__raw_writew(0x2000, 0xb03fffec);  /* mrshpc irq enable */
+
+	se7722_domain_init();
+	se7722_gc_init();
+}