Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / platforms / 86xx / pic.c

diff --git a/kernel/arch/powerpc/platforms/86xx/pic.c b/kernel/arch/powerpc/platforms/86xx/pic.c
new file mode 100644 (file)
index 0000000..d5b98c0
--- /dev/null
+++ b/kernel/arch/powerpc/platforms/86xx/pic.c
@@ -0,0 +1,71 @@
+/*
+ * 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_irq.h>
+#include <linux/of_platform.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)
+{
+       struct irq_chip *chip = irq_desc_get_chip(desc);
+       unsigned int cascade_irq = i8259_irq();
+
+       if (cascade_irq != NO_IRQ)
+               generic_handle_irq(cascade_irq);
+
+       chip->irq_eoi(&desc->irq_data);
+}
+#endif /* CONFIG_PPC_I8259 */
+
+void __init mpc86xx_init_irq(void)
+{
+#ifdef CONFIG_PPC_I8259
+       struct device_node *np;
+       struct device_node *cascade_node = NULL;
+       int cascade_irq;
+#endif
+
+       struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
+                       MPIC_SINGLE_DEST_CPU,
+                       0, 256, " MPIC     ");
+       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);
+
+       irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
+#endif
+}