![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
765 lines
18 KiB
C
765 lines
18 KiB
C
/* irq.c: FRV IRQ handling
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*
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* Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* (mostly architecture independent, will move to kernel/irq.c in 2.5.)
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*
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* IRQs 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/config.h>
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#include <linux/ptrace.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/timex.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/smp_lock.h>
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/irq.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/atomic.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/system.h>
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#include <asm/bitops.h>
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#include <asm/uaccess.h>
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#include <asm/pgalloc.h>
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#include <asm/delay.h>
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#include <asm/irq.h>
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#include <asm/irc-regs.h>
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#include <asm/irq-routing.h>
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#include <asm/gdb-stub.h>
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extern void __init fpga_init(void);
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extern void __init route_mb93493_irqs(void);
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static void register_irq_proc (unsigned int irq);
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/*
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* Special irq handlers.
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*/
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irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) { return IRQ_HANDLED; }
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atomic_t irq_err_count;
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/*
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* Generic, controller-independent functions:
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*/
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int show_interrupts(struct seq_file *p, void *v)
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{
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struct irqaction *action;
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struct irq_group *group;
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unsigned long flags;
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int level, grp, ix, i, j;
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i = *(loff_t *) v;
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switch (i) {
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case 0:
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seq_printf(p, " ");
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for (j = 0; j < NR_CPUS; j++)
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if (cpu_online(j))
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seq_printf(p, "CPU%d ",j);
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seq_putc(p, '\n');
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break;
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case 1 ... NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP:
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local_irq_save(flags);
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grp = (i - 1) / NR_IRQ_ACTIONS_PER_GROUP;
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group = irq_groups[grp];
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if (!group)
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goto skip;
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ix = (i - 1) % NR_IRQ_ACTIONS_PER_GROUP;
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action = group->actions[ix];
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if (!action)
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goto skip;
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seq_printf(p, "%3d: ", i - 1);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for (j = 0; j < NR_CPUS; j++)
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if (cpu_online(j))
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seq_printf(p, "%10u ", kstat_cpu(j).irqs[i - 1]);
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#endif
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level = group->sources[ix]->level - frv_irq_levels;
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seq_printf(p, " %12s@%x", group->sources[ix]->muxname, level);
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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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skip:
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local_irq_restore(flags);
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break;
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case NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP + 1:
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seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
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break;
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default:
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break;
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}
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return 0;
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}
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/*
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* Generic enable/disable code: this just calls
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* down into the PIC-specific version for the actual
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* hardware disable after having gotten the irq
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* controller lock.
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*/
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/**
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* disable_irq_nosync - disable an irq without waiting
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* @irq: Interrupt to disable
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*
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* Disable the selected interrupt line. Disables and Enables are
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* nested.
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* Unlike disable_irq(), this function does not ensure existing
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* instances of the IRQ handler have completed before returning.
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*
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* This function may be called from IRQ context.
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*/
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void disable_irq_nosync(unsigned int irq)
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{
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struct irq_source *source;
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struct irq_group *group;
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struct irq_level *level;
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unsigned long flags;
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int idx = irq & (NR_IRQ_ACTIONS_PER_GROUP - 1);
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group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
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if (!group)
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BUG();
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source = group->sources[idx];
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if (!source)
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BUG();
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level = source->level;
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spin_lock_irqsave(&level->lock, flags);
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if (group->control) {
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if (!group->disable_cnt[idx]++)
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group->control(group, idx, 0);
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} else if (!level->disable_count++) {
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__set_MASK(level - frv_irq_levels);
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}
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spin_unlock_irqrestore(&level->lock, flags);
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}
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/**
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* disable_irq - disable an irq and wait for completion
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* @irq: Interrupt to disable
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*
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* Disable the selected interrupt line. Enables and Disables are
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* nested.
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* This function waits for any pending IRQ handlers for this interrupt
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* to complete before returning. If you use this function while
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* holding a resource the IRQ handler may need you will deadlock.
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*
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* This function may be called - with care - from IRQ context.
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*/
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void disable_irq(unsigned int irq)
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{
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disable_irq_nosync(irq);
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#ifdef CONFIG_SMP
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if (!local_irq_count(smp_processor_id())) {
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do {
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barrier();
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} while (irq_desc[irq].status & IRQ_INPROGRESS);
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}
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#endif
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}
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/**
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* enable_irq - enable handling of an irq
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* @irq: Interrupt to enable
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*
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* Undoes the effect of one call to disable_irq(). If this
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* matches the last disable, processing of interrupts on this
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* IRQ line is re-enabled.
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*
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* This function may be called from IRQ context.
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*/
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void enable_irq(unsigned int irq)
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{
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struct irq_source *source;
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struct irq_group *group;
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struct irq_level *level;
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unsigned long flags;
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int idx = irq & (NR_IRQ_ACTIONS_PER_GROUP - 1);
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int count;
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group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
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if (!group)
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BUG();
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source = group->sources[idx];
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if (!source)
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BUG();
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level = source->level;
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spin_lock_irqsave(&level->lock, flags);
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if (group->control)
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count = group->disable_cnt[idx];
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else
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count = level->disable_count;
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switch (count) {
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case 1:
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if (group->control) {
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if (group->actions[idx])
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group->control(group, idx, 1);
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} else {
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if (level->usage)
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__clr_MASK(level - frv_irq_levels);
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}
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/* fall-through */
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default:
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count--;
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break;
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case 0:
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printk("enable_irq(%u) unbalanced from %p\n", irq, __builtin_return_address(0));
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}
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if (group->control)
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group->disable_cnt[idx] = count;
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else
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level->disable_count = count;
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spin_unlock_irqrestore(&level->lock, flags);
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}
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/*****************************************************************************/
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/*
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* handles all normal device IRQ's
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* - registers are referred to by the __frame variable (GR28)
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* - IRQ distribution is complicated in this arch because of the many PICs, the
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* way they work and the way they cascade
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*/
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asmlinkage void do_IRQ(void)
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{
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struct irq_source *source;
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int level, cpu;
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level = (__frame->tbr >> 4) & 0xf;
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cpu = smp_processor_id();
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#if 0
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{
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static u32 irqcount;
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*(volatile u32 *) 0xe1200004 = ~((irqcount++ << 8) | level);
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*(volatile u16 *) 0xffc00100 = (u16) ~0x9999;
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mb();
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}
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#endif
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if ((unsigned long) __frame - (unsigned long) (current + 1) < 512)
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BUG();
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__set_MASK(level);
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__clr_RC(level);
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__clr_IRL();
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kstat_this_cpu.irqs[level]++;
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irq_enter();
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for (source = frv_irq_levels[level].sources; source; source = source->next)
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source->doirq(source);
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irq_exit();
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__clr_MASK(level);
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/* only process softirqs if we didn't interrupt another interrupt handler */
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if ((__frame->psr & PSR_PIL) == PSR_PIL_0)
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if (local_softirq_pending())
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do_softirq();
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#ifdef CONFIG_PREEMPT
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local_irq_disable();
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while (--current->preempt_count == 0) {
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if (!(__frame->psr & PSR_S) ||
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current->need_resched == 0 ||
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in_interrupt())
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break;
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current->preempt_count++;
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local_irq_enable();
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preempt_schedule();
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local_irq_disable();
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}
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#endif
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#if 0
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{
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*(volatile u16 *) 0xffc00100 = (u16) ~0x6666;
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mb();
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}
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#endif
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} /* end do_IRQ() */
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/*****************************************************************************/
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/*
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* handles all NMIs when not co-opted by the debugger
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* - registers are referred to by the __frame variable (GR28)
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*/
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asmlinkage void do_NMI(void)
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{
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} /* end do_NMI() */
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/*****************************************************************************/
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/**
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* request_irq - allocate an interrupt line
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* @irq: Interrupt line to allocate
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* @handler: Function to be called when the IRQ occurs
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* @irqflags: Interrupt type flags
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* @devname: An ascii name for the claiming device
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* @dev_id: A cookie passed back to the handler function
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*
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* This call allocates interrupt resources and enables the
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* interrupt line and IRQ handling. From the point this
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* call is made your handler function may be invoked. Since
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* your handler function must clear any interrupt the board
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* raises, you must take care both to initialise your hardware
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* and to set up the interrupt handler in the right order.
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*
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* Dev_id must be globally unique. Normally the address of the
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* device data structure is used as the cookie. Since the handler
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* receives this value it makes sense to use it.
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*
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* If your interrupt is shared you must pass a non NULL dev_id
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* as this is required when freeing the interrupt.
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*
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* Flags:
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*
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* SA_SHIRQ Interrupt is shared
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*
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* SA_INTERRUPT Disable local interrupts while processing
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*
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* SA_SAMPLE_RANDOM The interrupt can be used for entropy
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*
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*/
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int request_irq(unsigned int irq,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long irqflags,
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const char * devname,
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void *dev_id)
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{
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int retval;
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struct irqaction *action;
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#if 1
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/*
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* Sanity-check: shared interrupts should REALLY pass in
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* a real dev-ID, otherwise we'll have trouble later trying
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* to figure out which interrupt is which (messes up the
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* interrupt freeing logic etc).
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*/
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if (irqflags & SA_SHIRQ) {
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if (!dev_id)
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printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n",
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devname, (&irq)[-1]);
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}
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#endif
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if ((irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP) >= NR_IRQ_GROUPS)
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return -EINVAL;
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if (!handler)
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return -EINVAL;
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action = (struct irqaction *) kmalloc(sizeof(struct irqaction), GFP_KERNEL);
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if (!action)
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return -ENOMEM;
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action->handler = handler;
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action->flags = irqflags;
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action->mask = CPU_MASK_NONE;
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action->name = devname;
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action->next = NULL;
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action->dev_id = dev_id;
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retval = setup_irq(irq, action);
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if (retval)
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kfree(action);
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return retval;
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}
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/**
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* free_irq - free an interrupt
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* @irq: Interrupt line to free
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* @dev_id: Device identity to free
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*
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* Remove an interrupt handler. The handler is removed and if the
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* interrupt line is no longer in use by any driver it is disabled.
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* On a shared IRQ the caller must ensure the interrupt is disabled
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* on the card it drives before calling this function. The function
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* does not return until any executing interrupts for this IRQ
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* have completed.
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*
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* This function may be called from interrupt context.
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*
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* Bugs: Attempting to free an irq in a handler for the same irq hangs
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* the machine.
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*/
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void free_irq(unsigned int irq, void *dev_id)
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{
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struct irq_source *source;
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struct irq_group *group;
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struct irq_level *level;
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struct irqaction **p, **pp;
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unsigned long flags;
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if ((irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP) >= NR_IRQ_GROUPS)
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return;
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group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
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if (!group)
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BUG();
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source = group->sources[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
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if (!source)
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BUG();
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level = source->level;
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p = &group->actions[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
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spin_lock_irqsave(&level->lock, flags);
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for (pp = p; *pp; pp = &(*pp)->next) {
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struct irqaction *action = *pp;
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if (action->dev_id != dev_id)
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continue;
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/* found it - remove from the list of entries */
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*pp = action->next;
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level->usage--;
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if (p == pp && group->control)
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group->control(group, irq & (NR_IRQ_ACTIONS_PER_GROUP - 1), 0);
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if (level->usage == 0)
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__set_MASK(level - frv_irq_levels);
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spin_unlock_irqrestore(&level->lock,flags);
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#ifdef CONFIG_SMP
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/* Wait to make sure it's not being used on another CPU */
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while (desc->status & IRQ_INPROGRESS)
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barrier();
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#endif
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kfree(action);
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return;
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}
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}
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/*
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* IRQ autodetection code..
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*
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* This depends on the fact that any interrupt that comes in on to an
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* unassigned IRQ will cause GxICR_DETECT to be set
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*/
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static DECLARE_MUTEX(probe_sem);
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/**
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* probe_irq_on - begin an interrupt autodetect
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*
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* Commence probing for an interrupt. The interrupts are scanned
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* and a mask of potential interrupt lines is returned.
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*
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*/
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unsigned long probe_irq_on(void)
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{
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down(&probe_sem);
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return 0;
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}
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/*
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* Return a mask of triggered interrupts (this
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* can handle only legacy ISA interrupts).
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*/
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/**
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* probe_irq_mask - scan a bitmap of interrupt lines
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* @val: mask of interrupts to consider
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*
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* Scan the ISA bus interrupt lines and return a bitmap of
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* active interrupts. The interrupt probe logic state is then
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* returned to its previous value.
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*
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* Note: we need to scan all the irq's even though we will
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* only return ISA irq numbers - just so that we reset them
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* all to a known state.
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*/
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unsigned int probe_irq_mask(unsigned long xmask)
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{
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up(&probe_sem);
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return 0;
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}
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/*
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* Return the one interrupt that triggered (this can
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* handle any interrupt source).
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*/
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/**
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* probe_irq_off - end an interrupt autodetect
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* @xmask: mask of potential interrupts (unused)
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*
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* Scans the unused interrupt lines and returns the line which
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* appears to have triggered the interrupt. If no interrupt was
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* found then zero is returned. If more than one interrupt is
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* found then minus the first candidate is returned to indicate
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* their is doubt.
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*
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* The interrupt probe logic state is returned to its previous
|
|
* value.
|
|
*
|
|
* BUGS: When used in a module (which arguably shouldnt happen)
|
|
* nothing prevents two IRQ probe callers from overlapping. The
|
|
* results of this are non-optimal.
|
|
*/
|
|
|
|
int probe_irq_off(unsigned long xmask)
|
|
{
|
|
up(&probe_sem);
|
|
return -1;
|
|
}
|
|
|
|
/* this was setup_x86_irq but it seems pretty generic */
|
|
int setup_irq(unsigned int irq, struct irqaction *new)
|
|
{
|
|
struct irq_source *source;
|
|
struct irq_group *group;
|
|
struct irq_level *level;
|
|
struct irqaction **p, **pp;
|
|
unsigned long flags;
|
|
|
|
group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP];
|
|
if (!group)
|
|
BUG();
|
|
|
|
source = group->sources[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
|
|
if (!source)
|
|
BUG();
|
|
|
|
level = source->level;
|
|
|
|
p = &group->actions[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)];
|
|
|
|
/*
|
|
* Some drivers like serial.c use request_irq() heavily,
|
|
* so we have to be careful not to interfere with a
|
|
* running system.
|
|
*/
|
|
if (new->flags & SA_SAMPLE_RANDOM) {
|
|
/*
|
|
* This function might sleep, we want to call it first,
|
|
* outside of the atomic block.
|
|
* Yes, this might clear the entropy pool if the wrong
|
|
* driver is attempted to be loaded, without actually
|
|
* installing a new handler, but is this really a problem,
|
|
* only the sysadmin is able to do this.
|
|
*/
|
|
rand_initialize_irq(irq);
|
|
}
|
|
|
|
/* must juggle the interrupt processing stuff with interrupts disabled */
|
|
spin_lock_irqsave(&level->lock, flags);
|
|
|
|
/* can't share interrupts unless all parties agree to */
|
|
if (level->usage != 0 && !(level->flags & new->flags & SA_SHIRQ)) {
|
|
spin_unlock_irqrestore(&level->lock,flags);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* add new interrupt at end of irq queue */
|
|
pp = p;
|
|
while (*pp)
|
|
pp = &(*pp)->next;
|
|
|
|
*pp = new;
|
|
|
|
level->usage++;
|
|
level->flags = new->flags;
|
|
|
|
/* turn the interrupts on */
|
|
if (level->usage == 1)
|
|
__clr_MASK(level - frv_irq_levels);
|
|
|
|
if (p == pp && group->control)
|
|
group->control(group, irq & (NR_IRQ_ACTIONS_PER_GROUP - 1), 1);
|
|
|
|
spin_unlock_irqrestore(&level->lock, flags);
|
|
register_irq_proc(irq);
|
|
return 0;
|
|
}
|
|
|
|
static struct proc_dir_entry * root_irq_dir;
|
|
static struct proc_dir_entry * irq_dir [NR_IRQS];
|
|
|
|
#define HEX_DIGITS 8
|
|
|
|
static unsigned int parse_hex_value (const char *buffer,
|
|
unsigned long count, unsigned long *ret)
|
|
{
|
|
unsigned char hexnum [HEX_DIGITS];
|
|
unsigned long value;
|
|
int i;
|
|
|
|
if (!count)
|
|
return -EINVAL;
|
|
if (count > HEX_DIGITS)
|
|
count = HEX_DIGITS;
|
|
if (copy_from_user(hexnum, buffer, count))
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Parse the first 8 characters as a hex string, any non-hex char
|
|
* is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same.
|
|
*/
|
|
value = 0;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
unsigned int c = hexnum[i];
|
|
|
|
switch (c) {
|
|
case '0' ... '9': c -= '0'; break;
|
|
case 'a' ... 'f': c -= 'a'-10; break;
|
|
case 'A' ... 'F': c -= 'A'-10; break;
|
|
default:
|
|
goto out;
|
|
}
|
|
value = (value << 4) | c;
|
|
}
|
|
out:
|
|
*ret = value;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
unsigned long *mask = (unsigned long *) data;
|
|
if (count < HEX_DIGITS+1)
|
|
return -EINVAL;
|
|
return sprintf (page, "%08lx\n", *mask);
|
|
}
|
|
|
|
static int prof_cpu_mask_write_proc (struct file *file, const char *buffer,
|
|
unsigned long count, void *data)
|
|
{
|
|
unsigned long *mask = (unsigned long *) data, full_count = count, err;
|
|
unsigned long new_value;
|
|
|
|
show_state();
|
|
err = parse_hex_value(buffer, count, &new_value);
|
|
if (err)
|
|
return err;
|
|
|
|
*mask = new_value;
|
|
return full_count;
|
|
}
|
|
|
|
#define MAX_NAMELEN 10
|
|
|
|
static void register_irq_proc (unsigned int irq)
|
|
{
|
|
char name [MAX_NAMELEN];
|
|
|
|
if (!root_irq_dir || irq_dir[irq])
|
|
return;
|
|
|
|
memset(name, 0, MAX_NAMELEN);
|
|
sprintf(name, "%d", irq);
|
|
|
|
/* create /proc/irq/1234 */
|
|
irq_dir[irq] = proc_mkdir(name, root_irq_dir);
|
|
}
|
|
|
|
unsigned long prof_cpu_mask = -1;
|
|
|
|
void init_irq_proc (void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
int i;
|
|
|
|
/* create /proc/irq */
|
|
root_irq_dir = proc_mkdir("irq", 0);
|
|
|
|
/* create /proc/irq/prof_cpu_mask */
|
|
entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
|
|
if (!entry)
|
|
return;
|
|
|
|
entry->nlink = 1;
|
|
entry->data = (void *)&prof_cpu_mask;
|
|
entry->read_proc = prof_cpu_mask_read_proc;
|
|
entry->write_proc = prof_cpu_mask_write_proc;
|
|
|
|
/*
|
|
* Create entries for all existing IRQs.
|
|
*/
|
|
for (i = 0; i < NR_IRQS; i++)
|
|
register_irq_proc(i);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* initialise the interrupt system
|
|
*/
|
|
void __init init_IRQ(void)
|
|
{
|
|
route_cpu_irqs();
|
|
fpga_init();
|
|
#ifdef CONFIG_FUJITSU_MB93493
|
|
route_mb93493_irqs();
|
|
#endif
|
|
} /* end init_IRQ() */
|