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authorGrant Likely <grant.likely@secretlab.ca>2011-07-26 11:19:06 +0200
committerGrant Likely <grant.likely@secretlab.ca>2011-07-28 09:32:04 +0200
commit7e71330169d8056536b299290544980bccc6b300 (patch)
tree7dab4954a7683e35bbf66adadd89b26971960311 /kernel
parentirq: add irq_domain translation infrastructure (diff)
downloadlinux-7e71330169d8056536b299290544980bccc6b300.tar.xz
linux-7e71330169d8056536b299290544980bccc6b300.zip
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/irqdomain.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 29c7bd42e25d..d5828da3fd38 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -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 */