microblaze_v8: Interrupt handling and timer support

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 104 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/irq.c b/arch/microblaze/kernel/irq.c
new file mode 100644
index 000000000000..f688ee93e3b9
--- /dev/null
+++ b/arch/microblaze/kernel/irq.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2007-2009 PetaLogix
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/hardirq.h>
+#include <linux/interrupt.h>
+#include <linux/irqflags.h>
+#include <linux/seq_file.h>
+#include <linux/kernel_stat.h>
+#include <linux/irq.h>
+
+#include <asm/prom.h>
+
+unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
+{
+        struct of_irq oirq;
+
+        if (of_irq_map_one(dev, index, &oirq))
+                return NO_IRQ;
+
+        return oirq.specifier[0];
+}
+EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
+
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+        printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
+}
+
+static u32 concurrent_irq;
+
+void do_IRQ(struct pt_regs *regs)
+{
+        unsigned int irq;
+        struct pt_regs *old_regs = set_irq_regs(regs);
+
+        irq_enter();
+        irq = get_irq(regs);
+next_irq:
+        BUG_ON(irq == -1U);
+        generic_handle_irq(irq);
+
+        irq = get_irq(regs);
+        if (irq != -1U) {
+                pr_debug("next irq: %d\n", irq);
+                ++concurrent_irq;
+                goto next_irq;
+        }
+
+        irq_exit();
+        set_irq_regs(old_regs);
+}
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+        int i = *(loff_t *) v, j;
+        struct irqaction *action;
+        unsigned long flags;
+
+        if (i == 0) {
+                seq_printf(p, "         ");
+                for_each_online_cpu(j)
+                        seq_printf(p, "CPU%-8d", j);
+                seq_putc(p, '\n');
+        }
+
+        if (i < nr_irq) {
+                spin_lock_irqsave(&irq_desc[i].lock, flags);
+                action = irq_desc[i].action;
+                if (!action)
+                        goto skip;
+                seq_printf(p, "%3d: ", i);
+#ifndef CONFIG_SMP
+                seq_printf(p, "%10u ", kstat_irqs(i));
+#else
+                for_each_online_cpu(j)
+                        seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+#endif
+                seq_printf(p, " %8s", irq_desc[i].status &
+                                        IRQ_LEVEL ? "level" : "edge");
+                seq_printf(p, " %8s", irq_desc[i].chip->name);
+                seq_printf(p, "  %s", action->name);
+
+                for (action = action->next; action; action = action->next)
+                        seq_printf(p, ", %s", action->name);
+
+                seq_putc(p, '\n');
+skip:
+                spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+        }
+        return 0;
+}