2005-04-17 00:20:36 +02:00
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/*
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* linux/arch/arm/kernel/irq.c
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*
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* Copyright (C) 1992 Linus Torvalds
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* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
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*
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2005-06-25 20:39:45 +02:00
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* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
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* Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
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* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
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*
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2005-04-17 00:20:36 +02:00
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file contains the code used by various IRQ handling routines:
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* asking for different IRQ's should be done through these routines
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* instead of just grabbing them. Thus setups with different IRQ numbers
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* shouldn't result in any weird surprises, and installing new handlers
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* should be easier.
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*
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* IRQ's are in fact implemented a bit like signal handlers for the kernel.
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* Naturally it's not a 1:1 relation, but there are similarities.
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*/
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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2006-07-01 23:30:09 +02:00
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#include <linux/irq.h>
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2005-04-17 00:20:36 +02:00
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#include <linux/random.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/kallsyms.h>
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#include <linux/proc_fs.h>
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2010-10-07 17:21:58 +02:00
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#include <linux/ftrace.h>
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2005-04-17 00:20:36 +02:00
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#include <asm/system.h>
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2010-12-20 11:18:36 +01:00
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#include <asm/mach/arch.h>
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2008-08-03 16:04:04 +02:00
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#include <asm/mach/irq.h>
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2005-06-25 20:39:45 +02:00
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#include <asm/mach/time.h>
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2005-04-17 00:20:36 +02:00
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/*
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* No architecture-specific irq_finish function defined in arm/arch/irqs.h.
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*/
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#ifndef irq_finish
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#define irq_finish(irq) do { } while (0)
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#endif
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2006-07-01 23:30:09 +02:00
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unsigned long irq_err_count;
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2005-04-17 00:20:36 +02:00
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, cpu;
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2010-06-25 10:46:09 +02:00
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struct irq_desc *desc;
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2005-04-17 00:20:36 +02:00
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struct irqaction * action;
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unsigned long flags;
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2010-11-15 15:33:51 +01:00
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int prec, n;
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for (prec = 3, n = 1000; prec < 10 && n <= nr_irqs; prec++)
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n *= 10;
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2005-04-17 00:20:36 +02:00
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2010-11-15 15:40:29 +01:00
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#ifdef CONFIG_SMP
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if (prec < 4)
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prec = 4;
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#endif
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2005-04-17 00:20:36 +02:00
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if (i == 0) {
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char cpuname[12];
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2010-11-15 15:33:51 +01:00
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seq_printf(p, "%*s ", prec, "");
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2005-04-17 00:20:36 +02:00
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for_each_present_cpu(cpu) {
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sprintf(cpuname, "CPU%d", cpu);
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seq_printf(p, " %10s", cpuname);
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}
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seq_putc(p, '\n');
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}
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2010-06-25 10:46:09 +02:00
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if (i < nr_irqs) {
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desc = irq_to_desc(i);
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raw_spin_lock_irqsave(&desc->lock, flags);
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action = desc->action;
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2005-04-17 00:20:36 +02:00
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if (!action)
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goto unlock;
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2010-11-15 15:33:51 +01:00
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seq_printf(p, "%*d: ", prec, i);
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2005-04-17 00:20:36 +02:00
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for_each_present_cpu(cpu)
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2009-01-11 22:35:56 +01:00
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seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
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2010-11-29 10:21:48 +01:00
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seq_printf(p, " %10s", desc->irq_data.chip->name ? : "-");
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2005-04-17 00:20:36 +02:00
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seq_printf(p, " %s", action->name);
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for (action = action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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unlock:
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2010-06-25 10:46:09 +02:00
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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} else if (i == nr_irqs) {
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2009-08-03 16:11:29 +02:00
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#ifdef CONFIG_FIQ
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2010-11-15 15:33:51 +01:00
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show_fiq_list(p, prec);
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2005-04-17 00:20:36 +02:00
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#endif
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#ifdef CONFIG_SMP
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2010-11-15 15:33:51 +01:00
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show_ipi_list(p, prec);
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2010-11-15 14:38:06 +01:00
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#endif
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#ifdef CONFIG_LOCAL_TIMERS
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2010-11-15 15:33:51 +01:00
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show_local_irqs(p, prec);
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2005-04-17 00:20:36 +02:00
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#endif
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2010-11-15 15:33:51 +01:00
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seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
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2005-04-17 00:20:36 +02:00
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}
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return 0;
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}
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/*
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* do_IRQ handles all hardware IRQ's. Decoded IRQs should not
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* come via this function. Instead, they should provide their
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* own 'handler'
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*/
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2010-10-07 17:21:58 +02:00
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asmlinkage void __exception_irq_entry
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asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
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2005-04-17 00:20:36 +02:00
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{
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2006-10-06 22:11:15 +02:00
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struct pt_regs *old_regs = set_irq_regs(regs);
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2008-10-09 14:36:24 +02:00
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irq_enter();
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2005-04-17 00:20:36 +02:00
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/*
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* Some hardware gives randomly wrong interrupts. Rather
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* than crashing, do something sensible.
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*/
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2010-06-25 10:46:09 +02:00
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if (unlikely(irq >= nr_irqs)) {
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2009-06-22 10:23:36 +02:00
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if (printk_ratelimit())
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printk(KERN_WARNING "Bad IRQ%u\n", irq);
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ack_bad_irq(irq);
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} else {
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2008-10-09 14:36:24 +02:00
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generic_handle_irq(irq);
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2009-06-22 10:23:36 +02:00
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}
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2005-04-17 00:20:36 +02:00
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2006-07-01 23:30:09 +02:00
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/* AT91 specific workaround */
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2005-04-17 00:20:36 +02:00
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irq_finish(irq);
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irq_exit();
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2006-10-06 22:11:15 +02:00
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set_irq_regs(old_regs);
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2005-04-17 00:20:36 +02:00
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}
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void set_irq_flags(unsigned int irq, unsigned int iflags)
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{
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2006-11-23 12:41:32 +01:00
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struct irq_desc *desc;
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2005-04-17 00:20:36 +02:00
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unsigned long flags;
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2010-06-25 10:46:09 +02:00
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if (irq >= nr_irqs) {
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2005-04-17 00:20:36 +02:00
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printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq);
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return;
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}
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2010-06-25 10:46:09 +02:00
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desc = irq_to_desc(irq);
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2009-11-17 16:46:45 +01:00
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raw_spin_lock_irqsave(&desc->lock, flags);
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2006-07-01 23:30:09 +02:00
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desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
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if (iflags & IRQF_VALID)
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desc->status &= ~IRQ_NOREQUEST;
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if (iflags & IRQF_PROBE)
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desc->status &= ~IRQ_NOPROBE;
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if (!(iflags & IRQF_NOAUTOEN))
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desc->status &= ~IRQ_NOAUTOEN;
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2009-11-17 16:46:45 +01:00
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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2005-04-17 00:20:36 +02:00
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}
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void __init init_IRQ(void)
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{
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2010-12-20 11:18:36 +01:00
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machine_desc->init_irq();
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2005-04-17 00:20:36 +02:00
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}
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2010-06-25 10:46:09 +02:00
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#ifdef CONFIG_SPARSE_IRQ
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int __init arch_probe_nr_irqs(void)
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{
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2010-12-20 11:18:36 +01:00
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nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
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2010-09-27 20:55:03 +02:00
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return nr_irqs;
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2010-06-25 10:46:09 +02:00
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}
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#endif
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2005-11-02 23:24:33 +01:00
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#ifdef CONFIG_HOTPLUG_CPU
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2006-07-11 23:54:34 +02:00
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2006-11-23 12:41:32 +01:00
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static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
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2006-07-11 23:54:34 +02:00
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{
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2010-11-29 10:21:48 +01:00
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pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->irq_data.node, cpu);
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2006-07-11 23:54:34 +02:00
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2009-11-17 16:46:45 +01:00
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raw_spin_lock_irq(&desc->lock);
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2010-11-29 10:21:48 +01:00
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desc->irq_data.chip->irq_set_affinity(&desc->irq_data,
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cpumask_of(cpu), false);
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2009-11-17 16:46:45 +01:00
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raw_spin_unlock_irq(&desc->lock);
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2006-07-11 23:54:34 +02:00
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}
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2005-11-02 23:24:33 +01:00
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/*
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* The CPU has been marked offline. Migrate IRQs off this CPU. If
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* the affinity settings do not allow other CPUs, force them onto any
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* available CPU.
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*/
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void migrate_irqs(void)
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{
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unsigned int i, cpu = smp_processor_id();
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2010-06-25 10:46:09 +02:00
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struct irq_desc *desc;
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2005-11-02 23:24:33 +01:00
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2010-06-25 10:46:09 +02:00
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for_each_irq_desc(i, desc) {
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2010-11-29 10:21:48 +01:00
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struct irq_data *d = &desc->irq_data;
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if (d->node == cpu) {
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unsigned int newcpu = cpumask_any_and(d->affinity,
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2009-01-13 00:27:13 +01:00
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cpu_online_mask);
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if (newcpu >= nr_cpu_ids) {
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2005-11-02 23:24:33 +01:00
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if (printk_ratelimit())
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printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
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i, cpu);
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2010-11-29 10:21:48 +01:00
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cpumask_setall(d->affinity);
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newcpu = cpumask_any_and(d->affinity,
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2009-01-13 00:27:13 +01:00
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cpu_online_mask);
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2005-11-02 23:24:33 +01:00
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}
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route_irq(desc, i, newcpu);
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}
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}
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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