powerpc/86xx: Refactor pic init

Moved the pic initialization into its own common file and out of the board
code.  Also fixed the OF reference counting on the mpic node.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/86xx/pic.c b/arch/powerpc/platforms/86xx/pic.c
new file mode 100644
index 000000000000..8881c5de500d
--- /dev/null
+++ b/arch/powerpc/platforms/86xx/pic.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * 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/stddef.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/of_platform.h>
+
+#include <asm/system.h>
+#include <asm/mpic.h>
+#include <asm/i8259.h>
+
+#ifdef CONFIG_PPC_I8259
+static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
+{
+	unsigned int cascade_irq = i8259_irq();
+	if (cascade_irq != NO_IRQ)
+		generic_handle_irq(cascade_irq);
+	desc->chip->eoi(irq);
+}
+#endif	/* CONFIG_PPC_I8259 */
+
+void __init mpc86xx_init_irq(void)
+{
+	struct mpic *mpic;
+	struct device_node *np;
+	struct resource res;
+#ifdef CONFIG_PPC_I8259
+	struct device_node *cascade_node = NULL;
+	int cascade_irq;
+#endif
+
+	/* Determine PIC address. */
+	np = of_find_node_by_type(NULL, "open-pic");
+	if (np == NULL)
+		return;
+	of_address_to_resource(np, 0, &res);
+
+	mpic = mpic_alloc(np, res.start,
+			MPIC_PRIMARY | MPIC_WANTS_RESET |
+			MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
+			0, 256, " MPIC     ");
+	of_node_put(np);
+	BUG_ON(mpic == NULL);
+
+	mpic_init(mpic);
+
+#ifdef CONFIG_PPC_I8259
+	/* Initialize i8259 controller */
+	for_each_node_by_type(np, "interrupt-controller")
+		if (of_device_is_compatible(np, "chrp,iic")) {
+			cascade_node = np;
+			break;
+		}
+
+	if (cascade_node == NULL) {
+		printk(KERN_DEBUG "Could not find i8259 PIC\n");
+		return;
+	}
+
+	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
+	if (cascade_irq == NO_IRQ) {
+		printk(KERN_ERR "Failed to map cascade interrupt\n");
+		return;
+	}
+
+	i8259_init(cascade_node, 0);
+	of_node_put(cascade_node);
+
+	set_irq_chained_handler(cascade_irq, mpc86xx_8259_cascade);
+#endif
+}