1 files changed, 125 insertions, 0 deletions

diff --git a/arch/arm/mach-s5pv310/irq-combiner.c b/arch/arm/mach-s5pv310/irq-combiner.c
new file mode 100644
index 000000000000..0f7052164f23
--- /dev/null
+++ b/arch/arm/mach-s5pv310/irq-combiner.c
@@ -0,0 +1,125 @@
+/* linux/arch/arm/mach-s5pv310/irq-combiner.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Based on arch/arm/common/gic.c
+ *
+ * IRQ COMBINER 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/io.h>
+
+#include <asm/mach/irq.h>
+
+#define COMBINER_ENABLE_SET     0x0
+#define COMBINER_ENABLE_CLEAR   0x4
+#define COMBINER_INT_STATUS     0xC
+
+static DEFINE_SPINLOCK(irq_controller_lock);
+
+struct combiner_chip_data {
+        unsigned int irq_offset;
+        void __iomem *base;
+};
+
+static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
+
+static inline void __iomem *combiner_base(unsigned int irq)
+{
+        struct combiner_chip_data *combiner_data = get_irq_chip_data(irq);
+        return combiner_data->base;
+}
+
+static void combiner_mask_irq(unsigned int irq)
+{
+        u32 mask = 1 << (irq % 32);
+
+        __raw_writel(mask, combiner_base(irq) + COMBINER_ENABLE_CLEAR);
+}
+
+static void combiner_unmask_irq(unsigned int irq)
+{
+        u32 mask = 1 << (irq % 32);
+
+        __raw_writel(mask, combiner_base(irq) + COMBINER_ENABLE_SET);
+}
+
+static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
+{
+        struct combiner_chip_data *chip_data = get_irq_data(irq);
+        struct irq_chip *chip = get_irq_chip(irq);
+        unsigned int cascade_irq, combiner_irq;
+        unsigned long status;
+
+        /* primary controller ack'ing */
+        chip->ack(irq);
+
+        spin_lock(&irq_controller_lock);
+        status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
+        spin_unlock(&irq_controller_lock);
+
+        if (status == 0)
+                goto out;
+
+        for (combiner_irq = 0; combiner_irq < 32; combiner_irq++) {
+                if (status & 0x1)
+                        break;
+                status >>= 1;
+        }
+
+        cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
+        if (unlikely(cascade_irq >= NR_IRQS))
+                do_bad_IRQ(cascade_irq, desc);
+        else
+                generic_handle_irq(cascade_irq);
+
+ out:
+        /* primary controller unmasking */
+        chip->unmask(irq);
+}
+
+static struct irq_chip combiner_chip = {
+        .name           = "COMBINER",
+        .mask           = combiner_mask_irq,
+        .unmask         = combiner_unmask_irq,
+};
+
+void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
+{
+        if (combiner_nr >= MAX_COMBINER_NR)
+                BUG();
+        if (set_irq_data(irq, &combiner_data[combiner_nr]) != 0)
+                BUG();
+        set_irq_chained_handler(irq, combiner_handle_cascade_irq);
+}
+
+void __init combiner_init(unsigned int combiner_nr, void __iomem *base,
+                          unsigned int irq_start)
+{
+        unsigned int i;
+
+        if (combiner_nr >= MAX_COMBINER_NR)
+                BUG();
+
+        combiner_data[combiner_nr].base = base;
+        combiner_data[combiner_nr].irq_offset = irq_start;
+
+        /* Disable all interrupts */
+
+        __raw_writel(0xffffffff, base + COMBINER_ENABLE_CLEAR);
+
+        /* Setup the Linux IRQ subsystem */
+
+        for (i = irq_start; i < combiner_data[combiner_nr].irq_offset
+                                + MAX_IRQ_IN_COMBINER; i++) {
+                set_irq_chip(i, &combiner_chip);
+                set_irq_chip_data(i, &combiner_data[combiner_nr]);
+                set_irq_handler(i, handle_level_irq);
+                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+        }
+}