1 files changed, 100 insertions, 0 deletions

diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
new file mode 100644
index 000000000000..0b608fa98d5a
--- /dev/null
+++ b/arch/mips/jazz/irq.c
@@ -0,0 +1,100 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 1992 Linus Torvalds
+ * Copyright (C) 1994 - 2001, 2003 Ralf Baechle
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+
+#include <asm/i8259.h>
+#include <asm/io.h>
+#include <asm/jazz.h>
+
+extern asmlinkage void jazz_handle_int(void);
+
+static DEFINE_SPINLOCK(r4030_lock);
+
+static void enable_r4030_irq(unsigned int irq)
+{
+        unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ);
+        unsigned long flags;
+
+        spin_lock_irqsave(&r4030_lock, flags);
+        mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
+        r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
+        spin_unlock_irqrestore(&r4030_lock, flags);
+}
+
+static unsigned int startup_r4030_irq(unsigned int irq)
+{
+        enable_r4030_irq(irq);
+        return 0; /* never anything pending */
+}
+
+#define shutdown_r4030_irq      disable_r4030_irq
+
+void disable_r4030_irq(unsigned int irq)
+{
+        unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ));
+        unsigned long flags;
+
+        spin_lock_irqsave(&r4030_lock, flags);
+        mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
+        r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
+        spin_unlock_irqrestore(&r4030_lock, flags);
+}
+
+#define mask_and_ack_r4030_irq disable_r4030_irq
+
+static void end_r4030_irq(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+                enable_r4030_irq(irq);
+}
+
+static struct hw_interrupt_type r4030_irq_type = {
+        "R4030",
+        startup_r4030_irq,
+        shutdown_r4030_irq,
+        enable_r4030_irq,
+        disable_r4030_irq,
+        mask_and_ack_r4030_irq,
+        end_r4030_irq,
+        NULL
+};
+
+void __init init_r4030_ints(void)
+{
+        int i;
+
+        for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) {
+                irq_desc[i].status     = IRQ_DISABLED;
+                irq_desc[i].action     = 0;
+                irq_desc[i].depth      = 1;
+                irq_desc[i].handler    = &r4030_irq_type;
+        }
+
+        r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
+        r4030_read_reg16(JAZZ_IO_IRQ_SOURCE);           /* clear pending IRQs */
+        r4030_read_reg32(JAZZ_R4030_INVAL_ADDR);        /* clear error bits */
+}
+
+/*
+ * On systems with i8259-style interrupt controllers we assume for
+ * driver compatibility reasons interrupts 0 - 15 to be the i8259
+ * interrupts even if the hardware uses a different interrupt numbering.
+ */
+void __init arch_init_irq(void)
+{
+        set_except_vector(0, jazz_handle_int);
+
+        init_i8259_irqs();                      /* Integrated i8259  */
+        init_r4030_ints();
+
+        change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
+}