irq: support domains with non-zero hwirq base
Interrupt controllers can have non-zero starting value for h/w irq numbers.
Adding support in irq_domain allows the domain hwirq numbering to match
the interrupt controllers' numbering.
As this makes looping over irqs for a domain more complicated, add loop
iterators to iterate over all hwirqs and irqs for a domain.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 3ad553e..99834e58 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -47,6 +47,7 @@
* of the irq_domain is responsible for allocating the array of
* irq_desc structures.
* @nr_irq: Number of irqs managed by the irq domain
+ * @hwirq_base: Starting number for hwirqs managed by the irq domain
* @ops: pointer to irq_domain methods
* @priv: private data pointer for use by owner. Not touched by irq_domain
* core code.
@@ -57,6 +58,7 @@
struct list_head list;
unsigned int irq_base;
unsigned int nr_irq;
+ unsigned int hwirq_base;
const struct irq_domain_ops *ops;
void *priv;
struct device_node *of_node;
@@ -72,9 +74,21 @@
static inline unsigned int irq_domain_to_irq(struct irq_domain *d,
unsigned long hwirq)
{
- return d->ops->to_irq ? d->ops->to_irq(d, hwirq) : d->irq_base + hwirq;
+ if (d->ops->to_irq)
+ return d->ops->to_irq(d, hwirq);
+ if (WARN_ON(hwirq < d->hwirq_base))
+ return 0;
+ return d->irq_base + hwirq - d->hwirq_base;
}
+#define irq_domain_for_each_hwirq(d, hw) \
+ for (hw = d->hwirq_base; hw < d->hwirq_base + d->nr_irq; hw++)
+
+#define irq_domain_for_each_irq(d, hw, irq) \
+ for (hw = d->hwirq_base, irq = irq_domain_to_irq(d, hw); \
+ hw < d->hwirq_base + d->nr_irq; \
+ hw++, irq = irq_domain_to_irq(d, hw))
+
extern void irq_domain_add(struct irq_domain *domain);
extern void irq_domain_del(struct irq_domain *domain);
#endif /* CONFIG_IRQ_DOMAIN */
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index b57a377..200ce83 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -20,15 +20,15 @@
void irq_domain_add(struct irq_domain *domain)
{
struct irq_data *d;
- int hwirq;
+ int hwirq, irq;
/*
* This assumes that the irq_domain owner has already allocated
* the irq_descs. This block will be removed when support for dynamic
* allocation of irq_descs is added to irq_domain.
*/
- for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
- d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
+ irq_domain_for_each_irq(domain, hwirq, irq) {
+ d = irq_get_irq_data(irq);
if (!d) {
WARN(1, "error: assigning domain to non existant irq_desc");
return;
@@ -54,15 +54,15 @@
void irq_domain_del(struct irq_domain *domain)
{
struct irq_data *d;
- int hwirq;
+ int hwirq, irq;
mutex_lock(&irq_domain_mutex);
list_del(&domain->list);
mutex_unlock(&irq_domain_mutex);
/* Clear the irq_domain assignments */
- for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
- d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
+ irq_domain_for_each_irq(domain, hwirq, irq) {
+ d = irq_get_irq_data(irq);
d->domain = NULL;
}
}