676 lines
16 KiB
C
676 lines
16 KiB
C
/* $Id: irq.c,v 1.114 2001/12/11 04:55:51 davem Exp $
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* arch/sparc/kernel/irq.c: Interrupt request handling routines. On the
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* Sparc the IRQs are basically 'cast in stone'
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* and you are supposed to probe the prom's device
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* node trees to find out who's got which IRQ.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
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* Copyright (C) 1995,2002 Pete A. Zaitcev (zaitcev@yahoo.com)
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* Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
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* Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org)
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/delay.h>
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#include <linux/threads.h>
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#include <linux/spinlock.h>
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#include <linux/seq_file.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/psr.h>
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#include <asm/smp.h>
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#include <asm/vaddrs.h>
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#include <asm/timer.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/traps.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/pcic.h>
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#include <asm/cacheflush.h>
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#include <asm/irq_regs.h>
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#include "irq.h"
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#ifdef CONFIG_SMP
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#define SMP_NOP2 "nop; nop;\n\t"
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#define SMP_NOP3 "nop; nop; nop;\n\t"
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#else
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#define SMP_NOP2
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#define SMP_NOP3
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#endif /* SMP */
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unsigned long __local_irq_save(void)
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{
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unsigned long retval;
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unsigned long tmp;
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__asm__ __volatile__(
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"rd %%psr, %0\n\t"
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SMP_NOP3 /* Sun4m + Cypress + SMP bug */
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"or %0, %2, %1\n\t"
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"wr %1, 0, %%psr\n\t"
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"nop; nop; nop\n"
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: "=&r" (retval), "=r" (tmp)
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: "i" (PSR_PIL)
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: "memory");
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return retval;
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}
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void local_irq_enable(void)
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{
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unsigned long tmp;
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__asm__ __volatile__(
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"rd %%psr, %0\n\t"
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SMP_NOP3 /* Sun4m + Cypress + SMP bug */
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"andn %0, %1, %0\n\t"
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"wr %0, 0, %%psr\n\t"
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"nop; nop; nop\n"
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: "=&r" (tmp)
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: "i" (PSR_PIL)
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: "memory");
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}
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void local_irq_restore(unsigned long old_psr)
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{
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unsigned long tmp;
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__asm__ __volatile__(
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"rd %%psr, %0\n\t"
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"and %2, %1, %2\n\t"
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SMP_NOP2 /* Sun4m + Cypress + SMP bug */
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"andn %0, %1, %0\n\t"
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"wr %0, %2, %%psr\n\t"
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"nop; nop; nop\n"
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: "=&r" (tmp)
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: "i" (PSR_PIL), "r" (old_psr)
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: "memory");
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}
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EXPORT_SYMBOL(__local_irq_save);
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EXPORT_SYMBOL(local_irq_enable);
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EXPORT_SYMBOL(local_irq_restore);
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/*
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* Dave Redman (djhr@tadpole.co.uk)
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*
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* IRQ numbers.. These are no longer restricted to 15..
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*
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* this is done to enable SBUS cards and onboard IO to be masked
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* correctly. using the interrupt level isn't good enough.
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*
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* For example:
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* A device interrupting at sbus level6 and the Floppy both come in
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* at IRQ11, but enabling and disabling them requires writing to
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* different bits in the SLAVIO/SEC.
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*
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* As a result of these changes sun4m machines could now support
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* directed CPU interrupts using the existing enable/disable irq code
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* with tweaks.
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*
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*/
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static void irq_panic(void)
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{
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extern char *cputypval;
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prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval);
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prom_halt();
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}
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void (*sparc_init_timers)(irq_handler_t ) =
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(void (*)(irq_handler_t )) irq_panic;
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/*
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* Dave Redman (djhr@tadpole.co.uk)
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*
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* There used to be extern calls and hard coded values here.. very sucky!
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* instead, because some of the devices attach very early, I do something
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* equally sucky but at least we'll never try to free statically allocated
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* space or call kmalloc before kmalloc_init :(.
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*
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* In fact it's the timer10 that attaches first.. then timer14
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* then kmalloc_init is called.. then the tty interrupts attach.
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* hmmm....
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*
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*/
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#define MAX_STATIC_ALLOC 4
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struct irqaction static_irqaction[MAX_STATIC_ALLOC];
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int static_irq_count;
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struct {
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struct irqaction *action;
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int flags;
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} sparc_irq[NR_IRQS];
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#define SPARC_IRQ_INPROGRESS 1
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/* Used to protect the IRQ action lists */
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DEFINE_SPINLOCK(irq_action_lock);
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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;
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struct irqaction * action;
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unsigned long flags;
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#ifdef CONFIG_SMP
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int j;
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#endif
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if (sparc_cpu_model == sun4d) {
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extern int show_sun4d_interrupts(struct seq_file *, void *);
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return show_sun4d_interrupts(p, v);
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}
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spin_lock_irqsave(&irq_action_lock, flags);
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if (i < NR_IRQS) {
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action = sparc_irq[i].action;
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if (!action)
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goto out_unlock;
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seq_printf(p, "%3d: ", i);
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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_each_online_cpu(j) {
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seq_printf(p, "%10u ",
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kstat_cpu(j).irqs[i]);
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}
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#endif
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seq_printf(p, " %c %s",
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(action->flags & IRQF_DISABLED) ? '+' : ' ',
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action->name);
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for (action=action->next; action; action = action->next) {
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seq_printf(p, ",%s %s",
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(action->flags & IRQF_DISABLED) ? " +" : "",
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action->name);
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}
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seq_putc(p, '\n');
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}
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out_unlock:
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spin_unlock_irqrestore(&irq_action_lock, flags);
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return 0;
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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 irqaction * action;
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struct irqaction **actionp;
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unsigned long flags;
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unsigned int cpu_irq;
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if (sparc_cpu_model == sun4d) {
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extern void sun4d_free_irq(unsigned int, void *);
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sun4d_free_irq(irq, dev_id);
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return;
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}
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cpu_irq = irq & (NR_IRQS - 1);
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if (cpu_irq > 14) { /* 14 irq levels on the sparc */
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printk("Trying to free bogus IRQ %d\n", irq);
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return;
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}
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spin_lock_irqsave(&irq_action_lock, flags);
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actionp = &sparc_irq[cpu_irq].action;
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action = *actionp;
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if (!action->handler) {
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printk("Trying to free free IRQ%d\n",irq);
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goto out_unlock;
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}
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if (dev_id) {
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for (; action; action = action->next) {
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if (action->dev_id == dev_id)
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break;
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actionp = &action->next;
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}
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if (!action) {
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printk("Trying to free free shared IRQ%d\n",irq);
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goto out_unlock;
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}
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} else if (action->flags & IRQF_SHARED) {
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printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
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goto out_unlock;
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}
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if (action->flags & SA_STATIC_ALLOC)
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{
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/* This interrupt is marked as specially allocated
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* so it is a bad idea to free it.
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*/
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printk("Attempt to free statically allocated IRQ%d (%s)\n",
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irq, action->name);
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goto out_unlock;
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}
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*actionp = action->next;
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spin_unlock_irqrestore(&irq_action_lock, flags);
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synchronize_irq(irq);
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spin_lock_irqsave(&irq_action_lock, flags);
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kfree(action);
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if (!sparc_irq[cpu_irq].action)
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__disable_irq(irq);
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out_unlock:
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spin_unlock_irqrestore(&irq_action_lock, flags);
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}
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EXPORT_SYMBOL(free_irq);
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/*
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* This is called when we want to synchronize with
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* interrupts. We may for example tell a device to
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* stop sending interrupts: but to make sure there
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* are no interrupts that are executing on another
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* CPU we need to call this function.
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*/
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#ifdef CONFIG_SMP
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void synchronize_irq(unsigned int irq)
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{
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unsigned int cpu_irq;
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cpu_irq = irq & (NR_IRQS - 1);
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while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
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cpu_relax();
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}
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#endif /* SMP */
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void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs)
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{
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int i;
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struct irqaction * action;
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unsigned int cpu_irq;
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cpu_irq = irq & (NR_IRQS - 1);
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action = sparc_irq[cpu_irq].action;
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printk("IO device interrupt, irq = %d\n", irq);
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printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc,
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regs->npc, regs->u_regs[14]);
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if (action) {
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printk("Expecting: ");
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for (i = 0; i < 16; i++)
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if (action->handler)
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printk("[%s:%d:0x%x] ", action->name,
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(int) i, (unsigned int) action->handler);
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}
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printk("AIEEE\n");
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panic("bogus interrupt received");
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}
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void handler_irq(int irq, struct pt_regs * regs)
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{
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struct pt_regs *old_regs;
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struct irqaction * action;
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int cpu = smp_processor_id();
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#ifdef CONFIG_SMP
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extern void smp4m_irq_rotate(int cpu);
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#endif
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old_regs = set_irq_regs(regs);
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irq_enter();
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disable_pil_irq(irq);
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#ifdef CONFIG_SMP
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/* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */
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if((sparc_cpu_model==sun4m) && (irq < 10))
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smp4m_irq_rotate(cpu);
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#endif
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action = sparc_irq[irq].action;
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sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS;
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kstat_cpu(cpu).irqs[irq]++;
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do {
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if (!action || !action->handler)
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unexpected_irq(irq, NULL, regs);
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action->handler(irq, action->dev_id);
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action = action->next;
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} while (action);
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sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS;
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enable_pil_irq(irq);
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irq_exit();
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set_irq_regs(old_regs);
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}
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#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
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/* Fast IRQs on the Sparc can only have one routine attached to them,
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* thus no sharing possible.
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*/
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static int request_fast_irq(unsigned int irq,
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void (*handler)(void),
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unsigned long irqflags, const char *devname)
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{
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struct irqaction *action;
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unsigned long flags;
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unsigned int cpu_irq;
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int ret;
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#ifdef CONFIG_SMP
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struct tt_entry *trap_table;
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extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3;
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#endif
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cpu_irq = irq & (NR_IRQS - 1);
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if(cpu_irq > 14) {
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ret = -EINVAL;
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goto out;
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}
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if(!handler) {
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ret = -EINVAL;
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goto out;
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}
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spin_lock_irqsave(&irq_action_lock, flags);
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action = sparc_irq[cpu_irq].action;
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if(action) {
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if(action->flags & IRQF_SHARED)
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panic("Trying to register fast irq when already shared.\n");
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if(irqflags & IRQF_SHARED)
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panic("Trying to register fast irq as shared.\n");
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/* Anyway, someone already owns it so cannot be made fast. */
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printk("request_fast_irq: Trying to register yet already owned.\n");
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ret = -EBUSY;
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goto out_unlock;
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}
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/* If this is flagged as statically allocated then we use our
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* private struct which is never freed.
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*/
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if (irqflags & SA_STATIC_ALLOC) {
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if (static_irq_count < MAX_STATIC_ALLOC)
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action = &static_irqaction[static_irq_count++];
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else
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printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
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irq, devname);
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}
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if (action == NULL)
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action = kmalloc(sizeof(struct irqaction),
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GFP_ATOMIC);
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if (!action) {
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ret = -ENOMEM;
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goto out_unlock;
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}
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/* Dork with trap table if we get this far. */
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#define INSTANTIATE(table) \
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table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \
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table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \
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SPARC_BRANCH((unsigned long) handler, \
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(unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\
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table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \
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table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP;
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INSTANTIATE(sparc_ttable)
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#ifdef CONFIG_SMP
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trap_table = &trapbase_cpu1; INSTANTIATE(trap_table)
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trap_table = &trapbase_cpu2; INSTANTIATE(trap_table)
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trap_table = &trapbase_cpu3; INSTANTIATE(trap_table)
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#endif
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#undef INSTANTIATE
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/*
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* XXX Correct thing whould be to flush only I- and D-cache lines
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* which contain the handler in question. But as of time of the
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* writing we have no CPU-neutral interface to fine-grained flushes.
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*/
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flush_cache_all();
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action->flags = irqflags;
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cpus_clear(action->mask);
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action->name = devname;
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action->dev_id = NULL;
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action->next = NULL;
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sparc_irq[cpu_irq].action = action;
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__enable_irq(irq);
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ret = 0;
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out_unlock:
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spin_unlock_irqrestore(&irq_action_lock, flags);
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out:
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return ret;
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}
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/* These variables are used to access state from the assembler
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* interrupt handler, floppy_hardint, so we cannot put these in
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* the floppy driver image because that would not work in the
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* modular case.
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*/
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volatile unsigned char *fdc_status;
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EXPORT_SYMBOL(fdc_status);
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char *pdma_vaddr;
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EXPORT_SYMBOL(pdma_vaddr);
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unsigned long pdma_size;
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EXPORT_SYMBOL(pdma_size);
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volatile int doing_pdma;
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EXPORT_SYMBOL(doing_pdma);
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char *pdma_base;
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EXPORT_SYMBOL(pdma_base);
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unsigned long pdma_areasize;
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EXPORT_SYMBOL(pdma_areasize);
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extern void floppy_hardint(void);
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static irqreturn_t (*floppy_irq_handler)(int irq, void *dev_id);
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void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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int cpu = smp_processor_id();
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old_regs = set_irq_regs(regs);
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disable_pil_irq(irq);
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irq_enter();
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kstat_cpu(cpu).irqs[irq]++;
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floppy_irq_handler(irq, dev_id);
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irq_exit();
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enable_pil_irq(irq);
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set_irq_regs(old_regs);
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// XXX Eek, it's totally changed with preempt_count() and such
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// if (softirq_pending(cpu))
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// do_softirq();
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}
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int sparc_floppy_request_irq(int irq, unsigned long flags,
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irqreturn_t (*irq_handler)(int irq, void *))
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{
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floppy_irq_handler = irq_handler;
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return request_fast_irq(irq, floppy_hardint, flags, "floppy");
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}
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EXPORT_SYMBOL(sparc_floppy_request_irq);
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#endif
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int request_irq(unsigned int irq,
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irq_handler_t handler,
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|
unsigned long irqflags, const char * devname, void *dev_id)
|
|
{
|
|
struct irqaction * action, **actionp;
|
|
unsigned long flags;
|
|
unsigned int cpu_irq;
|
|
int ret;
|
|
|
|
if (sparc_cpu_model == sun4d) {
|
|
extern int sun4d_request_irq(unsigned int,
|
|
irq_handler_t ,
|
|
unsigned long, const char *, void *);
|
|
return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
|
|
}
|
|
cpu_irq = irq & (NR_IRQS - 1);
|
|
if(cpu_irq > 14) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (!handler) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_irqsave(&irq_action_lock, flags);
|
|
|
|
actionp = &sparc_irq[cpu_irq].action;
|
|
action = *actionp;
|
|
if (action) {
|
|
if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) {
|
|
ret = -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) {
|
|
printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
|
|
ret = -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
for ( ; action; action = *actionp)
|
|
actionp = &action->next;
|
|
}
|
|
|
|
/* If this is flagged as statically allocated then we use our
|
|
* private struct which is never freed.
|
|
*/
|
|
if (irqflags & SA_STATIC_ALLOC) {
|
|
if (static_irq_count < MAX_STATIC_ALLOC)
|
|
action = &static_irqaction[static_irq_count++];
|
|
else
|
|
printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
|
|
}
|
|
|
|
if (action == NULL)
|
|
action = kmalloc(sizeof(struct irqaction),
|
|
GFP_ATOMIC);
|
|
|
|
if (!action) {
|
|
ret = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
action->handler = handler;
|
|
action->flags = irqflags;
|
|
cpus_clear(action->mask);
|
|
action->name = devname;
|
|
action->next = NULL;
|
|
action->dev_id = dev_id;
|
|
|
|
*actionp = action;
|
|
|
|
__enable_irq(irq);
|
|
|
|
ret = 0;
|
|
out_unlock:
|
|
spin_unlock_irqrestore(&irq_action_lock, flags);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(request_irq);
|
|
|
|
void disable_irq_nosync(unsigned int irq)
|
|
{
|
|
return __disable_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL(disable_irq_nosync);
|
|
|
|
void disable_irq(unsigned int irq)
|
|
{
|
|
return __disable_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL(disable_irq);
|
|
|
|
void enable_irq(unsigned int irq)
|
|
{
|
|
return __enable_irq(irq);
|
|
}
|
|
|
|
EXPORT_SYMBOL(enable_irq);
|
|
|
|
/* We really don't need these at all on the Sparc. We only have
|
|
* stubs here because they are exported to modules.
|
|
*/
|
|
unsigned long probe_irq_on(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_on);
|
|
|
|
int probe_irq_off(unsigned long mask)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_off);
|
|
|
|
/* djhr
|
|
* This could probably be made indirect too and assigned in the CPU
|
|
* bits of the code. That would be much nicer I think and would also
|
|
* fit in with the idea of being able to tune your kernel for your machine
|
|
* by removing unrequired machine and device support.
|
|
*
|
|
*/
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
extern void sun4c_init_IRQ( void );
|
|
extern void sun4m_init_IRQ( void );
|
|
extern void sun4d_init_IRQ( void );
|
|
|
|
switch(sparc_cpu_model) {
|
|
case sun4c:
|
|
case sun4:
|
|
sun4c_init_IRQ();
|
|
break;
|
|
|
|
case sun4m:
|
|
#ifdef CONFIG_PCI
|
|
pcic_probe();
|
|
if (pcic_present()) {
|
|
sun4m_pci_init_IRQ();
|
|
break;
|
|
}
|
|
#endif
|
|
sun4m_init_IRQ();
|
|
break;
|
|
|
|
case sun4d:
|
|
sun4d_init_IRQ();
|
|
break;
|
|
|
|
default:
|
|
prom_printf("Cannot initialize IRQs on this Sun machine...");
|
|
break;
|
|
}
|
|
btfixup();
|
|
}
|
|
|
|
void init_irq_proc(void)
|
|
{
|
|
/* For now, nothing... */
|
|
}
|