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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/irq.c | |
3 | * | |
4 | * Copyright (C) 1992 Linus Torvalds | |
5 | * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. | |
6 | * | |
8749af68 RK |
7 | * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. |
8 | * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and | |
9 | * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. | |
10 | * | |
1da177e4 LT |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * This file contains the code used by various IRQ handling routines: | |
16 | * asking for different IRQ's should be done through these routines | |
17 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
18 | * shouldn't result in any weird surprises, and installing new handlers | |
19 | * should be easier. | |
20 | * | |
21 | * IRQ's are in fact implemented a bit like signal handlers for the kernel. | |
22 | * Naturally it's not a 1:1 relation, but there are similarities. | |
23 | */ | |
1da177e4 LT |
24 | #include <linux/kernel_stat.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/signal.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/interrupt.h> | |
4a2581a0 | 29 | #include <linux/irq.h> |
1da177e4 LT |
30 | #include <linux/random.h> |
31 | #include <linux/smp.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/seq_file.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/list.h> | |
36 | #include <linux/kallsyms.h> | |
37 | #include <linux/proc_fs.h> | |
38 | ||
1da177e4 | 39 | #include <asm/system.h> |
897d8527 | 40 | #include <asm/mach/irq.h> |
8749af68 | 41 | #include <asm/mach/time.h> |
1da177e4 | 42 | |
1da177e4 LT |
43 | /* |
44 | * No architecture-specific irq_finish function defined in arm/arch/irqs.h. | |
45 | */ | |
46 | #ifndef irq_finish | |
47 | #define irq_finish(irq) do { } while (0) | |
48 | #endif | |
49 | ||
354e6f72 | 50 | unsigned int arch_nr_irqs; |
4a2581a0 TG |
51 | void (*init_arch_irq)(void) __initdata = NULL; |
52 | unsigned long irq_err_count; | |
1da177e4 LT |
53 | |
54 | int show_interrupts(struct seq_file *p, void *v) | |
55 | { | |
56 | int i = *(loff_t *) v, cpu; | |
354e6f72 | 57 | struct irq_desc *desc; |
1da177e4 LT |
58 | struct irqaction * action; |
59 | unsigned long flags; | |
60 | ||
61 | if (i == 0) { | |
62 | char cpuname[12]; | |
63 | ||
64 | seq_printf(p, " "); | |
65 | for_each_present_cpu(cpu) { | |
66 | sprintf(cpuname, "CPU%d", cpu); | |
67 | seq_printf(p, " %10s", cpuname); | |
68 | } | |
69 | seq_putc(p, '\n'); | |
70 | } | |
71 | ||
354e6f72 | 72 | if (i < nr_irqs) { |
73 | desc = irq_to_desc(i); | |
74 | raw_spin_lock_irqsave(&desc->lock, flags); | |
75 | action = desc->action; | |
1da177e4 LT |
76 | if (!action) |
77 | goto unlock; | |
78 | ||
79 | seq_printf(p, "%3d: ", i); | |
80 | for_each_present_cpu(cpu) | |
0b0f0b1c | 81 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu)); |
354e6f72 | 82 | seq_printf(p, " %10s", desc->chip->name ? : "-"); |
1da177e4 LT |
83 | seq_printf(p, " %s", action->name); |
84 | for (action = action->next; action; action = action->next) | |
85 | seq_printf(p, ", %s", action->name); | |
86 | ||
87 | seq_putc(p, '\n'); | |
88 | unlock: | |
354e6f72 | 89 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
90 | } else if (i == nr_irqs) { | |
baa28e35 | 91 | #ifdef CONFIG_FIQ |
1da177e4 LT |
92 | show_fiq_list(p, v); |
93 | #endif | |
94 | #ifdef CONFIG_SMP | |
95 | show_ipi_list(p); | |
37ee16ae | 96 | show_local_irqs(p); |
1da177e4 LT |
97 | #endif |
98 | seq_printf(p, "Err: %10lu\n", irq_err_count); | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
1da177e4 LT |
103 | /* |
104 | * do_IRQ handles all hardware IRQ's. Decoded IRQs should not | |
105 | * come via this function. Instead, they should provide their | |
106 | * own 'handler' | |
107 | */ | |
7ab3f8d5 | 108 | asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs) |
1da177e4 | 109 | { |
e6300155 | 110 | struct pt_regs *old_regs = set_irq_regs(regs); |
d8aa0251 DB |
111 | |
112 | irq_enter(); | |
1da177e4 LT |
113 | |
114 | /* | |
115 | * Some hardware gives randomly wrong interrupts. Rather | |
116 | * than crashing, do something sensible. | |
117 | */ | |
354e6f72 | 118 | if (unlikely(irq >= nr_irqs)) { |
7aa5514e AK |
119 | if (printk_ratelimit()) |
120 | printk(KERN_WARNING "Bad IRQ%u\n", irq); | |
121 | ack_bad_irq(irq); | |
122 | } else { | |
d8aa0251 | 123 | generic_handle_irq(irq); |
7aa5514e | 124 | } |
1da177e4 | 125 | |
4a2581a0 | 126 | /* AT91 specific workaround */ |
1da177e4 LT |
127 | irq_finish(irq); |
128 | ||
1da177e4 | 129 | irq_exit(); |
e6300155 | 130 | set_irq_regs(old_regs); |
1da177e4 LT |
131 | } |
132 | ||
1da177e4 LT |
133 | void set_irq_flags(unsigned int irq, unsigned int iflags) |
134 | { | |
10dd5ce2 | 135 | struct irq_desc *desc; |
1da177e4 LT |
136 | unsigned long flags; |
137 | ||
354e6f72 | 138 | if (irq >= nr_irqs) { |
1da177e4 LT |
139 | printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq); |
140 | return; | |
141 | } | |
142 | ||
354e6f72 | 143 | desc = irq_to_desc(irq); |
239007b8 | 144 | raw_spin_lock_irqsave(&desc->lock, flags); |
4a2581a0 TG |
145 | desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; |
146 | if (iflags & IRQF_VALID) | |
147 | desc->status &= ~IRQ_NOREQUEST; | |
148 | if (iflags & IRQF_PROBE) | |
149 | desc->status &= ~IRQ_NOPROBE; | |
150 | if (!(iflags & IRQF_NOAUTOEN)) | |
151 | desc->status &= ~IRQ_NOAUTOEN; | |
239007b8 | 152 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1da177e4 LT |
153 | } |
154 | ||
155 | void __init init_IRQ(void) | |
156 | { | |
1da177e4 | 157 | init_arch_irq(); |
1da177e4 LT |
158 | } |
159 | ||
354e6f72 | 160 | #ifdef CONFIG_SPARSE_IRQ |
161 | int __init arch_probe_nr_irqs(void) | |
162 | { | |
163 | nr_irqs = arch_nr_irqs ? arch_nr_irqs : NR_IRQS; | |
b683de2b | 164 | return nr_irqs; |
354e6f72 | 165 | } |
166 | #endif | |
167 | ||
a054a811 | 168 | #ifdef CONFIG_HOTPLUG_CPU |
f7ede370 | 169 | |
10dd5ce2 | 170 | static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu) |
f7ede370 | 171 | { |
41184f6a | 172 | pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->node, cpu); |
f7ede370 | 173 | |
239007b8 | 174 | raw_spin_lock_irq(&desc->lock); |
0de26520 | 175 | desc->chip->set_affinity(irq, cpumask_of(cpu)); |
239007b8 | 176 | raw_spin_unlock_irq(&desc->lock); |
f7ede370 TG |
177 | } |
178 | ||
a054a811 RK |
179 | /* |
180 | * The CPU has been marked offline. Migrate IRQs off this CPU. If | |
181 | * the affinity settings do not allow other CPUs, force them onto any | |
182 | * available CPU. | |
183 | */ | |
184 | void migrate_irqs(void) | |
185 | { | |
186 | unsigned int i, cpu = smp_processor_id(); | |
354e6f72 | 187 | struct irq_desc *desc; |
a054a811 | 188 | |
354e6f72 | 189 | for_each_irq_desc(i, desc) { |
41184f6a | 190 | if (desc->node == cpu) { |
e65e49d0 MT |
191 | unsigned int newcpu = cpumask_any_and(desc->affinity, |
192 | cpu_online_mask); | |
193 | if (newcpu >= nr_cpu_ids) { | |
a054a811 RK |
194 | if (printk_ratelimit()) |
195 | printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n", | |
196 | i, cpu); | |
197 | ||
e65e49d0 MT |
198 | cpumask_setall(desc->affinity); |
199 | newcpu = cpumask_any_and(desc->affinity, | |
200 | cpu_online_mask); | |
a054a811 RK |
201 | } |
202 | ||
203 | route_irq(desc, i, newcpu); | |
204 | } | |
205 | } | |
206 | } | |
207 | #endif /* CONFIG_HOTPLUG_CPU */ |