ARM: S3C64XX: Update regulator names for debugfs compatiblity on SMDK6410
[deliverable/linux.git] / arch / alpha / kernel / irq.c
1 /*
2 * linux/arch/alpha/kernel/irq.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 *
6 * This file contains the code used by various IRQ handling routines:
7 * asking for different IRQ's should be done through these routines
8 * instead of just grabbing them. Thus setups with different IRQ numbers
9 * shouldn't result in any weird surprises, and installing new handlers
10 * should be easier.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/signal.h>
18 #include <linux/sched.h>
19 #include <linux/ptrace.h>
20 #include <linux/interrupt.h>
21 #include <linux/random.h>
22 #include <linux/init.h>
23 #include <linux/irq.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/profile.h>
27 #include <linux/bitops.h>
28
29 #include <asm/system.h>
30 #include <asm/io.h>
31 #include <asm/uaccess.h>
32
33 volatile unsigned long irq_err_count;
34 DEFINE_PER_CPU(unsigned long, irq_pmi_count);
35
36 void ack_bad_irq(unsigned int irq)
37 {
38 irq_err_count++;
39 printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
40 }
41
42 #ifdef CONFIG_SMP
43 static char irq_user_affinity[NR_IRQS];
44
45 int irq_select_affinity(unsigned int irq)
46 {
47 struct irq_desc *desc = irq_to_desc[irq];
48 static int last_cpu;
49 int cpu = last_cpu + 1;
50
51 if (!desc || !get_irq_desc_chip(desc)->set_affinity || irq_user_affinity[irq])
52 return 1;
53
54 while (!cpu_possible(cpu) ||
55 !cpumask_test_cpu(cpu, irq_default_affinity))
56 cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
57 last_cpu = cpu;
58
59 cpumask_copy(desc->affinity, cpumask_of(cpu));
60 get_irq_desc_chip(desc)->set_affinity(irq, cpumask_of(cpu));
61 return 0;
62 }
63 #endif /* CONFIG_SMP */
64
65 int
66 show_interrupts(struct seq_file *p, void *v)
67 {
68 int j;
69 int irq = *(loff_t *) v;
70 struct irqaction * action;
71 struct irq_desc *desc;
72 unsigned long flags;
73
74 #ifdef CONFIG_SMP
75 if (irq == 0) {
76 seq_puts(p, " ");
77 for_each_online_cpu(j)
78 seq_printf(p, "CPU%d ", j);
79 seq_putc(p, '\n');
80 }
81 #endif
82
83 if (irq < ACTUAL_NR_IRQS) {
84 desc = irq_to_desc(irq);
85
86 if (!desc)
87 return 0;
88
89 raw_spin_lock_irqsave(&desc->lock, flags);
90 action = desc->action;
91 if (!action)
92 goto unlock;
93 seq_printf(p, "%3d: ", irq);
94 #ifndef CONFIG_SMP
95 seq_printf(p, "%10u ", kstat_irqs(irq));
96 #else
97 for_each_online_cpu(j)
98 seq_printf(p, "%10u ", kstat_irqs_cpu(irq, j));
99 #endif
100 seq_printf(p, " %14s", get_irq_desc_chip(desc)->name);
101 seq_printf(p, " %c%s",
102 (action->flags & IRQF_DISABLED)?'+':' ',
103 action->name);
104
105 for (action=action->next; action; action = action->next) {
106 seq_printf(p, ", %c%s",
107 (action->flags & IRQF_DISABLED)?'+':' ',
108 action->name);
109 }
110
111 seq_putc(p, '\n');
112 unlock:
113 raw_spin_unlock_irqrestore(&desc->lock, flags);
114 } else if (irq == ACTUAL_NR_IRQS) {
115 #ifdef CONFIG_SMP
116 seq_puts(p, "IPI: ");
117 for_each_online_cpu(j)
118 seq_printf(p, "%10lu ", cpu_data[j].ipi_count);
119 seq_putc(p, '\n');
120 #endif
121 seq_puts(p, "PMI: ");
122 for_each_online_cpu(j)
123 seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j));
124 seq_puts(p, " Performance Monitoring\n");
125 seq_printf(p, "ERR: %10lu\n", irq_err_count);
126 }
127 return 0;
128 }
129
130 /*
131 * handle_irq handles all normal device IRQ's (the special
132 * SMP cross-CPU interrupts have their own specific
133 * handlers).
134 */
135
136 #define MAX_ILLEGAL_IRQS 16
137
138 void
139 handle_irq(int irq)
140 {
141 /*
142 * We ack quickly, we don't want the irq controller
143 * thinking we're snobs just because some other CPU has
144 * disabled global interrupts (we have already done the
145 * INT_ACK cycles, it's too late to try to pretend to the
146 * controller that we aren't taking the interrupt).
147 *
148 * 0 return value means that this irq is already being
149 * handled by some other CPU. (or is disabled)
150 */
151 static unsigned int illegal_count=0;
152 struct irq_desc *desc = irq_to_desc(irq);
153
154 if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS &&
155 illegal_count < MAX_ILLEGAL_IRQS)) {
156 irq_err_count++;
157 illegal_count++;
158 printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
159 irq);
160 return;
161 }
162
163 /*
164 * From here we must proceed with IPL_MAX. Note that we do not
165 * explicitly enable interrupts afterwards - some MILO PALcode
166 * (namely LX164 one) seems to have severe problems with RTI
167 * at IPL 0.
168 */
169 local_irq_disable();
170 irq_enter();
171 generic_handle_irq_desc(irq, desc);
172 irq_exit();
173 }
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