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Subject[PATCH v3 2/2] dt/irq: add irq_domain_generate_simple() helper
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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>
---
include/linux/irqdomain.h | 12 +++++++++
kernel/irq/irqdomain.c | 59 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 70 insertions(+), 1 deletions(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 8f2c10a..8e3ea36 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -16,6 +16,7 @@
#define _LINUX_IRQDOMAIN_H

#include <linux/irq.h>
+#include <linux/mod_devicetable.h>

#ifdef CONFIG_IRQ_DOMAIN
struct device_node;
@@ -76,6 +77,17 @@ static inline unsigned int irq_domain_to_irq(struct irq_domain *d,

extern void irq_domain_add(struct irq_domain *domain);
extern void irq_domain_del(struct irq_domain *domain);
+
+#ifdef 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_OF_IRQ */
+static inline void irq_domain_generate_simple(const struct of_device_id *match,
+ u64 phys_base, unsigned int irq_start) { }
+#endif /* CONFIG_OF_IRQ */
+
+
#endif /* CONFIG_IRQ_DOMAIN */

#endif /* _LINUX_IRQDOMAIN_H */
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 171b754..d5828da 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1,9 +1,10 @@
-
#include <linux/irq.h>
#include <linux/irqdomain.h>
#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);
@@ -120,4 +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 */


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