xref: /openbmc/linux/arch/sh/kernel/irq.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /* $Id: irq.c,v 1.20 2004/01/13 05:52:11 kkojima Exp $
2  *
3  * linux/arch/sh/kernel/irq.c
4  *
5  *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
6  *
7  *
8  * SuperH version:  Copyright (C) 1999  Niibe Yutaka
9  */
10 
11 /*
12  * IRQs are in fact implemented a bit like signal handlers for the kernel.
13  * Naturally it's not a 1:1 relation, but there are similarities.
14  */
15 
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/ptrace.h>
19 #include <linux/errno.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/signal.h>
22 #include <linux/sched.h>
23 #include <linux/ioport.h>
24 #include <linux/interrupt.h>
25 #include <linux/timex.h>
26 #include <linux/mm.h>
27 #include <linux/slab.h>
28 #include <linux/random.h>
29 #include <linux/smp.h>
30 #include <linux/smp_lock.h>
31 #include <linux/init.h>
32 #include <linux/seq_file.h>
33 #include <linux/kallsyms.h>
34 #include <linux/bitops.h>
35 
36 #include <asm/system.h>
37 #include <asm/io.h>
38 #include <asm/pgalloc.h>
39 #include <asm/delay.h>
40 #include <asm/irq.h>
41 #include <linux/irq.h>
42 
43 
44 /*
45  * 'what should we do if we get a hw irq event on an illegal vector'.
46  * each architecture has to answer this themselves, it doesn't deserve
47  * a generic callback i think.
48  */
49 void ack_bad_irq(unsigned int irq)
50 {
51 	printk("unexpected IRQ trap at vector %02x\n", irq);
52 }
53 
54 #if defined(CONFIG_PROC_FS)
55 int show_interrupts(struct seq_file *p, void *v)
56 {
57 	int i = *(loff_t *) v, j;
58 	struct irqaction * action;
59 	unsigned long flags;
60 
61 	if (i == 0) {
62 		seq_puts(p, "           ");
63 		for (j=0; j<NR_CPUS; j++)
64 			if (cpu_online(j))
65 				seq_printf(p, "CPU%d       ",j);
66 		seq_putc(p, '\n');
67 	}
68 
69 	if (i < ACTUAL_NR_IRQS) {
70 		spin_lock_irqsave(&irq_desc[i].lock, flags);
71 		action = irq_desc[i].action;
72 		if (!action)
73 			goto unlock;
74 		seq_printf(p, "%3d: ",i);
75 		seq_printf(p, "%10u ", kstat_irqs(i));
76 		seq_printf(p, " %14s", irq_desc[i].handler->typename);
77 		seq_printf(p, "  %s", action->name);
78 
79 		for (action=action->next; action; action = action->next)
80 			seq_printf(p, ", %s", action->name);
81 		seq_putc(p, '\n');
82 unlock:
83 		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
84 	}
85 	return 0;
86 }
87 #endif
88 
89 asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
90 		      unsigned long r6, unsigned long r7,
91 		      struct pt_regs regs)
92 {
93 	int irq;
94 
95 	irq_enter();
96 	asm volatile("stc	r2_bank, %0\n\t"
97 		     "shlr2	%0\n\t"
98 		     "shlr2	%0\n\t"
99 		     "shlr	%0\n\t"
100 		     "add	#-16, %0\n\t"
101 		     :"=z" (irq));
102 	irq = irq_demux(irq);
103 	__do_IRQ(irq, &regs);
104 	irq_exit();
105 	return 1;
106 }
107