microblaze: Fix IRQ entry/exit ftracing
[linux-2.6.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
21 #include <asm/prom.h>
22
23 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
24 {
25         struct of_irq oirq;
26
27         if (of_irq_map_one(dev, index, &oirq))
28                 return NO_IRQ;
29
30         return oirq.specifier[0];
31 }
32 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
33
34 static u32 concurrent_irq;
35
36 void __irq_entry do_IRQ(struct pt_regs *regs)
37 {
38         unsigned int irq;
39         struct pt_regs *old_regs = set_irq_regs(regs);
40
41         irq_enter();
42         irq = get_irq(regs);
43 next_irq:
44         BUG_ON(irq == -1U);
45         generic_handle_irq(irq);
46
47         irq = get_irq(regs);
48         if (irq != -1U) {
49                 pr_debug("next irq: %d\n", irq);
50                 ++concurrent_irq;
51                 goto next_irq;
52         }
53
54         irq_exit();
55         set_irq_regs(old_regs);
56 }
57
58 int show_interrupts(struct seq_file *p, void *v)
59 {
60         int i = *(loff_t *) v, j;
61         struct irqaction *action;
62         unsigned long flags;
63
64         if (i == 0) {
65                 seq_printf(p, "         ");
66                 for_each_online_cpu(j)
67                         seq_printf(p, "CPU%-8d", j);
68                 seq_putc(p, '\n');
69         }
70
71         if (i < nr_irq) {
72                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
73                 action = irq_desc[i].action;
74                 if (!action)
75                         goto skip;
76                 seq_printf(p, "%3d: ", i);
77 #ifndef CONFIG_SMP
78                 seq_printf(p, "%10u ", kstat_irqs(i));
79 #else
80                 for_each_online_cpu(j)
81                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
82 #endif
83                 seq_printf(p, " %8s", irq_desc[i].status &
84                                         IRQ_LEVEL ? "level" : "edge");
85                 seq_printf(p, " %8s", irq_desc[i].chip->name);
86                 seq_printf(p, "  %s", action->name);
87
88                 for (action = action->next; action; action = action->next)
89                         seq_printf(p, ", %s", action->name);
90
91                 seq_putc(p, '\n');
92 skip:
93                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
94         }
95         return 0;
96 }
97
98 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
99   intc without any cascades or any connection that's why mapping is 1:1 */
100 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
101 {
102         return hwirq;
103 }
104 EXPORT_SYMBOL_GPL(irq_create_mapping);
105
106 unsigned int irq_create_of_mapping(struct device_node *controller,
107                                         u32 *intspec, unsigned int intsize)
108 {
109         return intspec[0];
110 }
111 EXPORT_SYMBOL_GPL(irq_create_of_mapping);