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>

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 8f2c10a784a48f586fd76943595638d65b629087..e807ad687a07c38c831dfd32d8598ee2b50fcd30 100644 (file)
--- 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;
@@ -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 */

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 29c7bd42e25d7330014973d60c7abf200449085b..d5828da3fd383908c142971a0b5a91c10be17f71 100644 (file)
--- 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 */