Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
[pandora-kernel.git] / arch / microblaze / kernel / irq.c
1 /*
2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3  * Copyright (C) 2007-2009 PetaLogix
4  * Copyright (C) 2006 Atmark Techno, Inc.
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file "COPYING" in the main directory of this archive
8  * for more details.
9  */
10
11 #include <linux/init.h>
12 #include <linux/ftrace.h>
13 #include <linux/kernel.h>
14 #include <linux/hardirq.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqflags.h>
17 #include <linux/seq_file.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/irq.h>
20 #include <linux/of_irq.h>
21
22 #include <asm/prom.h>
23
24 static u32 concurrent_irq;
25
26 void __irq_entry do_IRQ(struct pt_regs *regs)
27 {
28         unsigned int irq;
29         struct pt_regs *old_regs = set_irq_regs(regs);
30         trace_hardirqs_off();
31
32         irq_enter();
33         irq = get_irq(regs);
34 next_irq:
35         BUG_ON(irq == -1U);
36         generic_handle_irq(irq);
37
38         irq = get_irq(regs);
39         if (irq != -1U) {
40                 pr_debug("next irq: %d\n", irq);
41                 ++concurrent_irq;
42                 goto next_irq;
43         }
44
45         irq_exit();
46         set_irq_regs(old_regs);
47         trace_hardirqs_on();
48 }
49
50 int show_interrupts(struct seq_file *p, void *v)
51 {
52         int i = *(loff_t *) v, j;
53         struct irq_desc *desc;
54         struct irqaction *action;
55         unsigned long flags;
56
57         if (i == 0) {
58                 seq_printf(p, "         ");
59                 for_each_online_cpu(j)
60                         seq_printf(p, "CPU%-8d", j);
61                 seq_putc(p, '\n');
62         }
63
64         if (i < nr_irq) {
65                 desc = irq_to_desc(i);
66                 raw_spin_lock_irqsave(&desc->lock, flags);
67                 action = desc->action;
68                 if (!action)
69                         goto skip;
70                 seq_printf(p, "%3d: ", i);
71 #ifndef CONFIG_SMP
72                 seq_printf(p, "%10u ", kstat_irqs(i));
73 #else
74                 for_each_online_cpu(j)
75                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
76 #endif
77                 seq_printf(p, " %8s", desc->status &
78                                         IRQ_LEVEL ? "level" : "edge");
79                 seq_printf(p, " %8s", desc->irq_data.chip->name);
80                 seq_printf(p, "  %s", action->name);
81
82                 for (action = action->next; action; action = action->next)
83                         seq_printf(p, ", %s", action->name);
84
85                 seq_putc(p, '\n');
86 skip:
87                 raw_spin_unlock_irqrestore(&desc->lock, flags);
88         }
89         return 0;
90 }
91
92 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
93   intc without any cascades or any connection that's why mapping is 1:1 */
94 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
95 {
96         return hwirq;
97 }
98 EXPORT_SYMBOL_GPL(irq_create_mapping);
99
100 unsigned int irq_create_of_mapping(struct device_node *controller,
101                                    const u32 *intspec, unsigned int intsize)
102 {
103         return intspec[0];
104 }
105 EXPORT_SYMBOL_GPL(irq_create_of_mapping);