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/*
* xen/arch/arm/irq.c
*
* ARM Interrupt support
*
* Ian Campbell <ian.campbell@citrix.com>
* Copyright (c) 2011 Citrix Systems.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <xen/config.h>
#include <xen/lib.h>
#include <xen/spinlock.h>
#include <xen/irq.h>
#include <xen/init.h>
#include <xen/errno.h>
#include <xen/sched.h>
#include <asm/gic.h>
static void enable_none(struct irq_desc *irq) { }
static unsigned int startup_none(struct irq_desc *irq) { return 0; }
static void disable_none(struct irq_desc *irq) { }
static void ack_none(struct irq_desc *irq)
{
printk("unexpected IRQ trap at irq %02x\n", irq->irq);
}
#define shutdown_none disable_none
#define end_none enable_none
hw_irq_controller no_irq_type = {
.typename = "none",
.startup = startup_none,
.shutdown = shutdown_none,
.enable = enable_none,
.disable = disable_none,
.ack = ack_none,
.end = end_none
};
int __init arch_init_one_irq_desc(struct irq_desc *desc)
{
return 0;
}
static int __init init_irq_data(void)
{
int irq;
for (irq = NR_LOCAL_IRQS; irq < NR_IRQS; irq++) {
struct irq_desc *desc = irq_to_desc(irq);
init_one_irq_desc(desc);
desc->irq = irq;
desc->action = NULL;
}
return 0;
}
static int __cpuinit init_local_irq_data(void)
{
int irq;
for (irq = 0; irq < NR_LOCAL_IRQS; irq++) {
struct irq_desc *desc = irq_to_desc(irq);
init_one_irq_desc(desc);
desc->irq = irq;
desc->action = NULL;
}
return 0;
}
void __init init_IRQ(void)
{
BUG_ON(init_local_irq_data() < 0);
BUG_ON(init_irq_data() < 0);
}
void __cpuinit init_secondary_IRQ(void)
{
BUG_ON(init_local_irq_data() < 0);
}
int __init request_irq(unsigned int irq,
void (*handler)(int, void *, struct cpu_user_regs *),
unsigned long irqflags, const char * devname, void *dev_id)
{
struct irqaction *action;
int retval;
/*
* Sanity-check: shared interrupts must pass in a real dev-ID,
* otherwise we'll have trouble later trying to figure out
* which interrupt is which (messes up the interrupt freeing
* logic etc).
*/
if (irq >= nr_irqs)
return -EINVAL;
if (!handler)
return -EINVAL;
action = xmalloc(struct irqaction);
if (!action)
return -ENOMEM;
action->handler = handler;
action->name = devname;
action->dev_id = dev_id;
action->free_on_release = 1;
retval = setup_irq(irq, action);
if (retval)
xfree(action);
return retval;
}
/* Dispatch an interrupt */
void do_IRQ(struct cpu_user_regs *regs, unsigned int irq, int is_fiq)
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action = desc->action;
/* TODO: perfc_incr(irqs); */
/* TODO: this_cpu(irq_count)++; */
irq_enter();
spin_lock(&desc->lock);
desc->handler->ack(desc);
if ( action == NULL )
{
printk("Unknown %s %#3.3x\n",
is_fiq ? "FIQ" : "IRQ", irq);
goto out;
}
if ( desc->status & IRQ_GUEST )
{
struct domain *d = action->dev_id;
desc->handler->end(desc);
desc->status |= IRQ_INPROGRESS;
/* XXX: inject irq into all guest vcpus */
vgic_vcpu_inject_irq(d->vcpu[0], irq, 0);
goto out_no_end;
}
desc->status |= IRQ_PENDING;
/*
* Since we set PENDING, if another processor is handling a different
* instance of this same irq, the other processor will take care of it.
*/
if ( desc->status & (IRQ_DISABLED | IRQ_INPROGRESS) )
goto out;
desc->status |= IRQ_INPROGRESS;
action = desc->action;
while ( desc->status & IRQ_PENDING )
{
desc->status &= ~IRQ_PENDING;
spin_unlock_irq(&desc->lock);
action->handler(irq, action->dev_id, regs);
spin_lock_irq(&desc->lock);
}
desc->status &= ~IRQ_INPROGRESS;
out:
desc->handler->end(desc);
out_no_end:
spin_unlock(&desc->lock);
irq_exit();
}
/*
* pirq event channels. We don't use these on ARM, instead we use the
* features of the GIC to inject virtualised normal interrupts.
*/
struct pirq *alloc_pirq_struct(struct domain *d)
{
return NULL;
}
/*
* These are all unreachable given an alloc_pirq_struct
* which returns NULL, all callers try to lookup struct pirq first
* which will fail.
*/
int pirq_guest_bind(struct vcpu *v, struct pirq *pirq, int will_share)
{
BUG();
}
void pirq_guest_unbind(struct domain *d, struct pirq *pirq)
{
BUG();
}
void pirq_set_affinity(struct domain *d, int pirq, const cpumask_t *mask)
{
BUG();
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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