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dt/irq: add irq_domain_generate_simple() helper 

irq_domain_generate_simple() is an easy way to generate an irq translation
domain for simple irq controllers.  It assumes a flat 1:1 mapping from
hardware irq number to an offset of the first linux irq number assigned
to the controller

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
hifive-unleashed-5.1
Grant Likely 2011-07-26 03:19:06 -06:00
parent 08a543ad33
commit 7e71330169
2 changed files with 68 additions and 0 deletions
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10
include/linux/irqdomain.h
View File

@ -16,6 +16,7 @@
#define _LINUX_IRQDOMAIN_H
#include <linux/irq.h>
#include <linux/mod_devicetable.h>
#ifdef CONFIG_IRQ_DOMAIN
struct device_node;
@ -78,4 +79,13 @@ extern void irq_domain_add(struct irq_domain *domain);
extern void irq_domain_del(struct irq_domain *domain);
#endif /* CONFIG_IRQ_DOMAIN */
#if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ)
extern void irq_domain_add_simple(struct device_node *controller, int irq_base);
extern void irq_domain_generate_simple(const struct of_device_id *match,
u64 phys_base, unsigned int irq_start);
#else /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
static inline void irq_domain_generate_simple(const struct of_device_id *match,
u64 phys_base, unsigned int irq_start) { }
#endif /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
#endif /* _LINUX_IRQDOMAIN_H */

58
kernel/irq/irqdomain.c
View File

@ -3,6 +3,8 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
static LIST_HEAD(irq_domain_list);
static DEFINE_MUTEX(irq_domain_mutex);
@ -119,4 +121,60 @@ void irq_dispose_mapping(unsigned int irq)
*/
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
int irq_domain_simple_dt_translate(struct irq_domain *d,
struct device_node *controller,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type)
{
if (d->of_node != controller)
return -EINVAL;
if (intsize < 1)
return -EINVAL;
*out_hwirq = intspec[0];
*out_type = IRQ_TYPE_NONE;
if (intsize > 1)
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
return 0;
}
struct irq_domain_ops irq_domain_simple_ops = {
.dt_translate = irq_domain_simple_dt_translate,
};
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
/**
* irq_domain_create_simple() - Set up a 'simple' translation range
*/
void irq_domain_add_simple(struct device_node *controller, int irq_base)
{
struct irq_domain *domain;
domain = kzalloc(sizeof(*domain), GFP_KERNEL);
if (!domain) {
WARN_ON(1);
return;
}
domain->irq_base = irq_base;
domain->of_node = of_node_get(controller);
domain->ops = &irq_domain_simple_ops;
irq_domain_add(domain);
}
EXPORT_SYMBOL_GPL(irq_domain_add_simple);
void irq_domain_generate_simple(const struct of_device_id *match,
u64 phys_base, unsigned int irq_start)
{
struct device_node *node;
pr_info("looking for phys_base=%llx, irq_start=%i\n",
(unsigned long long) phys_base, (int) irq_start);
node = of_find_matching_node_by_address(NULL, match, phys_base);
if (node)
irq_domain_add_simple(node, irq_start);
else
pr_info("no node found\n");
}
EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
#endif /* CONFIG_OF_IRQ */