-/* $Id: irq.c,v 1.114 2001/12/11 04:55:51 davem Exp $
+/*
* arch/sparc/kernel/irq.c: Interrupt request handling routines. On the
- * Sparc the IRQ's are basically 'cast in stone'
+ * Sparc the IRQs are basically 'cast in stone'
* and you are supposed to probe the prom's device
* node trees to find out who's got which IRQ.
*
* Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org)
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/linkage.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
-#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <asm/pgtable.h>
#include <asm/pcic.h>
#include <asm/cacheflush.h>
+#include <asm/irq_regs.h>
+
+#include "irq.h"
#ifdef CONFIG_SMP
#define SMP_NOP2 "nop; nop;\n\t"
#define SMP_NOP2
#define SMP_NOP3
#endif /* SMP */
-unsigned long __local_irq_save(void)
+
+int nr_irqs = NR_IRQS;
+
+unsigned long __raw_local_irq_save(void)
{
unsigned long retval;
unsigned long tmp;
return retval;
}
-void local_irq_enable(void)
+void raw_local_irq_enable(void)
{
unsigned long tmp;
: "memory");
}
-void local_irq_restore(unsigned long old_psr)
+void raw_local_irq_restore(unsigned long old_psr)
{
unsigned long tmp;
: "memory");
}
-EXPORT_SYMBOL(__local_irq_save);
-EXPORT_SYMBOL(local_irq_enable);
-EXPORT_SYMBOL(local_irq_restore);
+EXPORT_SYMBOL(__raw_local_irq_save);
+EXPORT_SYMBOL(raw_local_irq_enable);
+EXPORT_SYMBOL(raw_local_irq_restore);
/*
* Dave Redman (djhr@tadpole.co.uk)
prom_halt();
}
-void (*sparc_init_timers)(irqreturn_t (*)(int, void *,struct pt_regs *)) =
- (void (*)(irqreturn_t (*)(int, void *,struct pt_regs *))) irq_panic;
+void (*sparc_init_timers)(irq_handler_t ) =
+ (void (*)(irq_handler_t )) irq_panic;
/*
* Dave Redman (djhr@tadpole.co.uk)
struct irqaction static_irqaction[MAX_STATIC_ALLOC];
int static_irq_count;
-struct irqaction *irq_action[NR_IRQS] = {
- [0 ... (NR_IRQS-1)] = NULL
-};
+static struct {
+ struct irqaction *action;
+ int flags;
+} sparc_irq[NR_IRQS];
+#define SPARC_IRQ_INPROGRESS 1
/* Used to protect the IRQ action lists */
DEFINE_SPINLOCK(irq_action_lock);
}
spin_lock_irqsave(&irq_action_lock, flags);
if (i < NR_IRQS) {
- action = *(i + irq_action);
+ action = sparc_irq[i].action;
if (!action)
goto out_unlock;
seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
- for (j = 0; j < NR_CPUS; j++) {
- if (cpu_online(j))
- seq_printf(p, "%10u ",
- kstat_cpu(cpu_logical_map(j)).irqs[i]);
+ for_each_online_cpu(j) {
+ seq_printf(p, "%10u ",
+ kstat_cpu(j).irqs[i]);
}
#endif
seq_printf(p, " %c %s",
- (action->flags & SA_INTERRUPT) ? '+' : ' ',
+ (action->flags & IRQF_DISABLED) ? '+' : ' ',
action->name);
for (action=action->next; action; action = action->next) {
seq_printf(p, ",%s %s",
- (action->flags & SA_INTERRUPT) ? " +" : "",
+ (action->flags & IRQF_DISABLED) ? " +" : "",
action->name);
}
seq_putc(p, '\n');
void free_irq(unsigned int irq, void *dev_id)
{
struct irqaction * action;
- struct irqaction * tmp = NULL;
+ struct irqaction **actionp;
unsigned long flags;
unsigned int cpu_irq;
spin_lock_irqsave(&irq_action_lock, flags);
- action = *(cpu_irq + irq_action);
+ actionp = &sparc_irq[cpu_irq].action;
+ action = *actionp;
if (!action->handler) {
printk("Trying to free free IRQ%d\n",irq);
for (; action; action = action->next) {
if (action->dev_id == dev_id)
break;
- tmp = action;
+ actionp = &action->next;
}
if (!action) {
printk("Trying to free free shared IRQ%d\n",irq);
goto out_unlock;
}
- } else if (action->flags & SA_SHIRQ) {
+ } else if (action->flags & IRQF_SHARED) {
printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
goto out_unlock;
}
irq, action->name);
goto out_unlock;
}
-
- if (action && tmp)
- tmp->next = action->next;
- else
- *(cpu_irq + irq_action) = action->next;
+
+ *actionp = action->next;
spin_unlock_irqrestore(&irq_action_lock, flags);
kfree(action);
- if (!(*(cpu_irq + irq_action)))
- disable_irq(irq);
+ if (!sparc_irq[cpu_irq].action)
+ __disable_irq(irq);
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
#ifdef CONFIG_SMP
void synchronize_irq(unsigned int irq)
{
- printk("synchronize_irq says: implement me!\n");
- BUG();
+ unsigned int cpu_irq;
+
+ cpu_irq = irq & (NR_IRQS - 1);
+ while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
+ cpu_relax();
}
#endif /* SMP */
unsigned int cpu_irq;
cpu_irq = irq & (NR_IRQS - 1);
- action = *(cpu_irq + irq_action);
+ action = sparc_irq[cpu_irq].action;
printk("IO device interrupt, irq = %d\n", irq);
printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc,
void handler_irq(int irq, struct pt_regs * regs)
{
+ struct pt_regs *old_regs;
struct irqaction * action;
int cpu = smp_processor_id();
#ifdef CONFIG_SMP
extern void smp4m_irq_rotate(int cpu);
#endif
+ old_regs = set_irq_regs(regs);
irq_enter();
disable_pil_irq(irq);
#ifdef CONFIG_SMP
- /* Only rotate on lower priority IRQ's (scsi, ethernet, etc.). */
- if(irq < 10)
+ /* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */
+ if((sparc_cpu_model==sun4m) && (irq < 10))
smp4m_irq_rotate(cpu);
#endif
- action = *(irq + irq_action);
+ action = sparc_irq[irq].action;
+ sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS;
kstat_cpu(cpu).irqs[irq]++;
do {
if (!action || !action->handler)
unexpected_irq(irq, NULL, regs);
- action->handler(irq, action->dev_id, regs);
+ action->handler(irq, action->dev_id);
action = action->next;
} while (action);
+ sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS;
enable_pil_irq(irq);
irq_exit();
+ set_irq_regs(old_regs);
}
-#ifdef CONFIG_BLK_DEV_FD
-extern void floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
-
-void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- int cpu = smp_processor_id();
+#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
- disable_pil_irq(irq);
- irq_enter();
- kstat_cpu(cpu).irqs[irq]++;
- floppy_interrupt(irq, dev_id, regs);
- irq_exit();
- enable_pil_irq(irq);
- // XXX Eek, it's totally changed with preempt_count() and such
- // if (softirq_pending(cpu))
- // do_softirq();
-}
-#endif
-
-/* Fast IRQ's on the Sparc can only have one routine attached to them,
+/* Fast IRQs on the Sparc can only have one routine attached to them,
* thus no sharing possible.
*/
-int request_fast_irq(unsigned int irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags, const char *devname)
+static int request_fast_irq(unsigned int irq,
+ void (*handler)(void),
+ unsigned long irqflags, const char *devname)
{
struct irqaction *action;
unsigned long flags;
spin_lock_irqsave(&irq_action_lock, flags);
- action = *(cpu_irq + irq_action);
+ action = sparc_irq[cpu_irq].action;
if(action) {
- if(action->flags & SA_SHIRQ)
+ if(action->flags & IRQF_SHARED)
panic("Trying to register fast irq when already shared.\n");
- if(irqflags & SA_SHIRQ)
+ if(irqflags & IRQF_SHARED)
panic("Trying to register fast irq as shared.\n");
/* Anyway, someone already owns it so cannot be made fast. */
}
if (action == NULL)
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
+ action = kmalloc(sizeof(struct irqaction),
GFP_ATOMIC);
if (!action) {
*/
flush_cache_all();
- action->handler = handler;
action->flags = irqflags;
cpus_clear(action->mask);
action->name = devname;
action->dev_id = NULL;
action->next = NULL;
- *(cpu_irq + irq_action) = action;
+ sparc_irq[cpu_irq].action = action;
- enable_irq(irq);
+ __enable_irq(irq);
ret = 0;
out_unlock:
return ret;
}
+/* These variables are used to access state from the assembler
+ * interrupt handler, floppy_hardint, so we cannot put these in
+ * the floppy driver image because that would not work in the
+ * modular case.
+ */
+volatile unsigned char *fdc_status;
+EXPORT_SYMBOL(fdc_status);
+
+char *pdma_vaddr;
+EXPORT_SYMBOL(pdma_vaddr);
+
+unsigned long pdma_size;
+EXPORT_SYMBOL(pdma_size);
+
+volatile int doing_pdma;
+EXPORT_SYMBOL(doing_pdma);
+
+char *pdma_base;
+EXPORT_SYMBOL(pdma_base);
+
+unsigned long pdma_areasize;
+EXPORT_SYMBOL(pdma_areasize);
+
+extern void floppy_hardint(void);
+
+static irq_handler_t floppy_irq_handler;
+
+void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs;
+ int cpu = smp_processor_id();
+
+ old_regs = set_irq_regs(regs);
+ disable_pil_irq(irq);
+ irq_enter();
+ kstat_cpu(cpu).irqs[irq]++;
+ floppy_irq_handler(irq, dev_id);
+ irq_exit();
+ enable_pil_irq(irq);
+ set_irq_regs(old_regs);
+ // XXX Eek, it's totally changed with preempt_count() and such
+ // if (softirq_pending(cpu))
+ // do_softirq();
+}
+
+int sparc_floppy_request_irq(int irq, unsigned long flags,
+ irq_handler_t irq_handler)
+{
+ floppy_irq_handler = irq_handler;
+ return request_fast_irq(irq, floppy_hardint, flags, "floppy");
+}
+EXPORT_SYMBOL(sparc_floppy_request_irq);
+
+#endif
+
int request_irq(unsigned int irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ irq_handler_t handler,
unsigned long irqflags, const char * devname, void *dev_id)
{
- struct irqaction * action, *tmp = NULL;
+ 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,
- irqreturn_t (*)(int, void *, struct pt_regs *),
+ irq_handler_t ,
unsigned long, const char *, void *);
return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
}
spin_lock_irqsave(&irq_action_lock, flags);
- action = *(cpu_irq + irq_action);
+ actionp = &sparc_irq[cpu_irq].action;
+ action = *actionp;
if (action) {
- if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
- for (tmp = action; tmp->next; tmp = tmp->next);
- } else {
+ if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) {
ret = -EBUSY;
goto out_unlock;
}
- if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
+ 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;
- }
- action = NULL; /* Or else! */
+ }
+ for ( ; action; action = *actionp)
+ actionp = &action->next;
}
/* If this is flagged as statically allocated then we use our
}
if (action == NULL)
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
+ action = kmalloc(sizeof(struct irqaction),
GFP_ATOMIC);
if (!action) {
action->next = NULL;
action->dev_id = dev_id;
- if (tmp)
- tmp->next = action;
- else
- *(cpu_irq + irq_action) = action;
+ *actionp = action;
- enable_irq(irq);
+ __enable_irq(irq);
ret = 0;
out_unlock:
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.
*/
break;
default:
- prom_printf("Cannot initialize IRQ's on this Sun machine...");
+ prom_printf("Cannot initialize IRQs on this Sun machine...");
break;
}
btfixup();
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff