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>

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 */