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