patch-2.4.19 linux-2.4.19/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c

• Lines: 114
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c linux-2.4.19/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c
@@ -0,0 +1,113 @@
+/*
+ * The irq controller for vrc5476.
+ *
+ * Copyright (C) 2001 MontaVista Software Inc.
+ * Author: jsun@mvista.com or jsun@junsun.net
+ *
+ * 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/init.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+
+#include <asm/system.h>
+
+#include <asm/ddb5xxx/ddb5xxx.h>
+
+static int irq_base;
+
+static void vrc5476_irq_enable(uint irq)
+{
+	nile4_enable_irq(irq - irq_base);
+}
+
+static void vrc5476_irq_disable(uint irq)
+{
+	nile4_disable_irq(irq - irq_base);
+}
+
+static unsigned int vrc5476_irq_startup(uint irq)
+{
+	nile4_enable_irq(irq - irq_base);
+	return 0;
+}
+
+#define vrc5476_irq_shutdown	vrc5476_irq_disable
+
+static void vrc5476_irq_ack(uint irq)
+{
+	nile4_clear_irq(irq - irq_base);
+	nile4_disable_irq(irq - irq_base);
+}
+
+static void vrc5476_irq_end(uint irq)
+{
+	if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		vrc5476_irq_enable(irq);
+}
+
+static hw_irq_controller vrc5476_irq_controller = {
+	"vrc5476",
+	vrc5476_irq_startup,
+	vrc5476_irq_shutdown,
+	vrc5476_irq_enable,
+	vrc5476_irq_disable,
+	vrc5476_irq_ack,
+	vrc5476_irq_end,
+	NULL				/* no affinity stuff for UP */
+};
+
+void __init 
+vrc5476_irq_init(u32 base)
+{
+	extern irq_desc_t irq_desc[];
+	u32 i;
+
+	irq_base = base;
+	for (i= base; i< base + NUM_VRC5476_IRQ; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = NULL;
+		 irq_desc[i].depth = 1;
+		 irq_desc[i].handler = &vrc5476_irq_controller;
+	}
+}
+
+
+asmlinkage void 
+vrc5476_irq_dispatch(struct pt_regs *regs)
+{
+	extern unsigned int do_IRQ(int irq, struct pt_regs *regs);
+	extern void spurious_interrupt(void);
+
+	u32 mask;
+	int nile4_irq;
+
+	mask = nile4_get_irq_stat(0);
+
+	/* quick check for possible time interrupt */
+	if (mask & (1 << VRC5476_IRQ_GPT)) {
+		do_IRQ(VRC5476_IRQ_BASE + VRC5476_IRQ_GPT, regs);
+		return;
+	}
+
+	/* check for i8259 interrupts */
+	if (mask & (1 << VRC5476_I8259_CASCADE)) {
+		int i8259_irq = nile4_i8259_iack();
+		do_IRQ(I8259_IRQ_BASE + i8259_irq, regs);
+		return;
+	}
+
+	/* regular nile4 interrupts (we should not really have any */
+	for (nile4_irq = 0; mask; nile4_irq++, mask >>= 1) {
+		if (mask & 1) {
+			do_IRQ(VRC5476_IRQ_BASE + nile4_irq, regs);
+			return;
+		}
+	}
+	spurious_interrupt();
+}