From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/mips/cobalt/irq.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 arch/mips/cobalt/irq.c

(limited to 'arch/mips/cobalt/irq.c')

diff --git a/arch/mips/cobalt/irq.c b/arch/mips/cobalt/irq.c
new file mode 100644
index 00000000000..6d2a8158139
--- /dev/null
+++ b/arch/mips/cobalt/irq.c
@@ -0,0 +1,102 @@
+/*
+ * IRQ vector handles
+ *
+ * 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) 1995, 1996, 1997, 2003 by Ralf Baechle
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <asm/i8259.h>
+#include <asm/irq_cpu.h>
+#include <asm/gt64120.h>
+#include <asm/ptrace.h>
+
+#include <asm/cobalt/cobalt.h>
+
+extern void cobalt_handle_int(void);
+
+/*
+ * We have two types of interrupts that we handle, ones that come in through
+ * the CPU interrupt lines, and ones that come in on the via chip. The CPU
+ * mappings are:
+ *
+ *    16,  - Software interrupt 0 (unused)	IE_SW0
+ *    17   - Software interrupt 1 (unused)	IE_SW0
+ *    18   - Galileo chip (timer)		IE_IRQ0
+ *    19   - Tulip 0 + NCR SCSI			IE_IRQ1
+ *    20   - Tulip 1				IE_IRQ2
+ *    21   - 16550 UART				IE_IRQ3
+ *    22   - VIA southbridge PIC		IE_IRQ4
+ *    23   - unused				IE_IRQ5
+ *
+ * The VIA chip is a master/slave 8259 setup and has the following interrupts:
+ *
+ *     8  - RTC
+ *     9  - PCI
+ *    14  - IDE0
+ *    15  - IDE1
+ */
+
+asmlinkage void cobalt_irq(struct pt_regs *regs)
+{
+	unsigned int pending = read_c0_status() & read_c0_cause();
+
+	if (pending & CAUSEF_IP2) {			/* int 18 */
+		unsigned long irq_src = GALILEO_INL(GT_INTRCAUSE_OFS);
+
+		/* Check for timer irq ... */
+		if (irq_src & GALILEO_T0EXP) {
+			/* Clear the int line */
+			GALILEO_OUTL(0, GT_INTRCAUSE_OFS);
+			do_IRQ(COBALT_TIMER_IRQ, regs);
+		}
+		return;
+	}
+
+	if (pending & CAUSEF_IP6) {			/* int 22 */
+		int irq = i8259_irq();
+
+		if (irq >= 0)
+			do_IRQ(irq, regs);
+		return;
+	}
+
+	if (pending & CAUSEF_IP3) {			/* int 19 */
+		do_IRQ(COBALT_ETH0_IRQ, regs);
+		return;
+	}
+
+	if (pending & CAUSEF_IP4) {			/* int 20 */
+		do_IRQ(COBALT_ETH1_IRQ, regs);
+		return;
+	}
+
+	if (pending & CAUSEF_IP5) {			/* int 21 */
+		do_IRQ(COBALT_SERIAL_IRQ, regs);
+		return;
+	}
+
+	if (pending & CAUSEF_IP7) {			/* int 23 */
+		do_IRQ(COBALT_QUBE_SLOT_IRQ, regs);
+		return;
+	}
+}
+
+void __init arch_init_irq(void)
+{
+	set_except_vector(0, cobalt_handle_int);
+
+	init_i8259_irqs();				/*  0 ... 15 */
+	mips_cpu_irq_init(16);				/* 16 ... 23 */
+
+	/*
+	 * Mask all cpu interrupts
+	 *  (except IE4, we already masked those at VIA level)
+	 */
+	change_c0_status(ST0_IM, IE_IRQ4);
+}
-- 
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