[MIPS] Wind River 4KC PPMC Eval Board Support

    
Support for the GT-64120-based Wind River 4KC PPMC Evaluation board.

Signed-off-by: Rongkai.Zhan <Rongkai.zhan@windriver.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/arch/mips/gt64120/wrppmc/irq.c b/arch/mips/gt64120/wrppmc/irq.c
new file mode 100644
index 000000000000..8605687e24ed
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/irq.c
@@ -0,0 +1,63 @@
+/*
+ * irq.c: GT64120 Interrupt Controller
+ *
+ * Copyright (C) 2006, Wind River System Inc.
+ * Author: Rongkai.Zhan, <rongkai.zhan@windriver.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/irq_cpu.h>
+#include <asm/gt64120.h>
+
+extern asmlinkage void handle_IRQ(void);
+
+/**
+ * Initialize GT64120 Interrupt Controller
+ */
+void gt64120_init_pic(void)
+{
+	/* clear CPU Interrupt Cause Registers */
+	GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21));
+	GT_WRITE(GT_HINTRCAUSE_OFS, 0x00);
+
+	/* Disable all interrupts from GT64120 bridge chip */
+	GT_WRITE(GT_INTRMASK_OFS, 0x00);
+	GT_WRITE(GT_HINTRMASK_OFS, 0x00);
+	GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00);
+	GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00);
+}
+
+void __init arch_init_irq(void)
+{
+	/* enable all CPU interrupt bits. */
+	set_c0_status(ST0_IM);	/* IE bit is still 0 */
+
+	/* Install MIPS Interrupt Trap Vector */
+	set_except_vector(0, handle_IRQ);
+
+	/* IRQ 0 - 7 are for MIPS common irq_cpu controller */
+	mips_cpu_irq_init(0);
+
+	gt64120_init_pic();
+}