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38c677cb9a
Patch from David Brownell ARM genirq cleanups/updates: - Start switching platforms to newer APIs * use "irq_chip" name, not "irqchip" * providing irq_chip.name - Show irq_chip.name in /proc/interrupts, like on x86. This update a bit more than half of the ARM code. The irq_chip.name values were chosen to match docs (if I have them) or be otherwise obvious ("FPGA", "CPLD", or matching the code). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
210 lines
5.1 KiB
C
210 lines
5.1 KiB
C
/*
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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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* 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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* 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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#include <linux/irq.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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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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#include <asm/system.h>
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#include <asm/mach/time.h>
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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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void (*init_arch_irq)(void) __initdata = NULL;
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unsigned long irq_err_count;
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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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struct irqaction * action;
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unsigned long flags;
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if (i == 0) {
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char cpuname[12];
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seq_printf(p, " ");
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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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if (i < NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto unlock;
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seq_printf(p, "%3d: ", i);
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for_each_present_cpu(cpu)
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seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
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seq_printf(p, " %10s", irq_desc[i].chip->name ? : "-");
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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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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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} else if (i == NR_IRQS) {
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#ifdef CONFIG_ARCH_ACORN
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show_fiq_list(p, v);
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#endif
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#ifdef CONFIG_SMP
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show_ipi_list(p);
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show_local_irqs(p);
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#endif
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seq_printf(p, "Err: %10lu\n", irq_err_count);
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}
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return 0;
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}
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/* Handle bad interrupts */
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static struct irq_desc bad_irq_desc = {
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.handle_irq = handle_bad_irq,
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.lock = SPIN_LOCK_UNLOCKED
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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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asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
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{
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struct irqdesc *desc = irq_desc + irq;
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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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if (irq >= NR_IRQS)
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desc = &bad_irq_desc;
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irq_enter();
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desc_handle_irq(irq, desc, regs);
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/* AT91 specific workaround */
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irq_finish(irq);
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irq_exit();
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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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struct irqdesc *desc;
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unsigned long flags;
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if (irq >= NR_IRQS) {
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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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desc = irq_desc + irq;
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spin_lock_irqsave(&desc->lock, flags);
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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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spin_unlock_irqrestore(&desc->lock, flags);
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}
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void __init init_IRQ(void)
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{
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int irq;
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for (irq = 0; irq < NR_IRQS; irq++)
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irq_desc[irq].status |= IRQ_NOREQUEST | IRQ_DELAYED_DISABLE |
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IRQ_NOPROBE;
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#ifdef CONFIG_SMP
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bad_irq_desc.affinity = CPU_MASK_ALL;
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bad_irq_desc.cpu = smp_processor_id();
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#endif
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init_arch_irq();
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void route_irq(struct irqdesc *desc, unsigned int irq, unsigned int cpu)
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{
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pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu);
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spin_lock_irq(&desc->lock);
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desc->chip->set_affinity(irq, cpumask_of_cpu(cpu));
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spin_unlock_irq(&desc->lock);
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}
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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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for (i = 0; i < NR_IRQS; i++) {
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struct irqdesc *desc = irq_desc + i;
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if (desc->cpu == cpu) {
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unsigned int newcpu = any_online_cpu(desc->affinity);
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if (newcpu == NR_CPUS) {
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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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cpus_setall(desc->affinity);
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newcpu = any_online_cpu(desc->affinity);
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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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