Adapt arch/powerpc i8259.c driver to genirq

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Index: linux-irq-work/arch/powerpc/sysdev/i8259.c
===================================================================
--- linux-irq-work.orig/arch/powerpc/sysdev/i8259.c	2006-07-01 15:25:11.000000000 +1000
+++ linux-irq-work/arch/powerpc/sysdev/i8259.c	2006-07-01 15:25:24.000000000 +1000
@@ -69,11 +69,6 @@
 	return irq + i8259_pic_irq_offset;
 }
 
-int i8259_irq_cascade(struct pt_regs *regs, void *unused)
-{
-	return i8259_irq(regs);
-}
-
 static void i8259_mask_and_ack_irq(unsigned int irq_nr)
 {
 	unsigned long flags;
@@ -129,19 +124,11 @@
 	spin_unlock_irqrestore(&i8259_lock, flags);
 }
 
-static void i8259_end_irq(unsigned int irq)
-{
-	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))
-	    && irq_desc[irq].action)
-		i8259_unmask_irq(irq);
-}
-
-struct hw_interrupt_type i8259_pic = {
-	.typename = " i8259    ",
-	.enable = i8259_unmask_irq,
-	.disable = i8259_mask_irq,
-	.ack = i8259_mask_and_ack_irq,
-	.end = i8259_end_irq,
+static struct irq_chip i8259_pic = {
+	.typename	= " i8259    ",
+	.mask		= i8259_mask_irq,
+	.unmask		= i8259_unmask_irq,
+	.mask_ack	= i8259_mask_and_ack_irq,
 };
 
 static struct resource pic1_iores = {
@@ -207,8 +194,11 @@
 
 	spin_unlock_irqrestore(&i8259_lock, flags);
 
-	for (i = 0; i < NUM_ISA_INTERRUPTS; ++i)
-		irq_desc[offset + i].chip = &i8259_pic;
+	for (i = 0; i < NUM_ISA_INTERRUPTS; ++i) {
+		set_irq_chip_and_handler(offset + i, &i8259_pic,
+					 handle_level_irq);
+		irq_desc[offset + i].status |= IRQ_LEVEL;
+	}
 
 	/* reserve our resources */
 	setup_irq(offset + 2, &i8259_irqaction);
Index: linux-irq-work/include/asm-powerpc/i8259.h
===================================================================
--- linux-irq-work.orig/include/asm-powerpc/i8259.h	2006-07-01 15:25:11.000000000 +1000
+++ linux-irq-work/include/asm-powerpc/i8259.h	2006-07-01 15:25:24.000000000 +1000
@@ -4,11 +4,8 @@
 
 #include <linux/irq.h>
 
-extern struct hw_interrupt_type i8259_pic;
-
 extern void i8259_init(unsigned long intack_addr, int offset);
 extern int i8259_irq(struct pt_regs *regs);
-extern int i8259_irq_cascade(struct pt_regs *regs, void *unused);
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_I8259_H */