ioport: Add resource check helpers

Add resource_overlaps() and resource_contains() helpers.
Code copied from kernel source.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 85288c3729af253a589e7909a30095e042ab9b9b..c12a7f70ad76d2cec70aabd147f819ddbe1fcdb8 100644 (file)
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -135,6 +135,22 @@ static inline unsigned long resource_type(const struct resource *res)
        return res->flags & IORESOURCE_TYPE_BITS;
 }
 
+/* True iff r1 completely contains r2 */
+static inline bool resource_contains(struct resource *r1, struct resource *r2)
+{
+       if (resource_type(r1) != resource_type(r2))
+               return false;
+       if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
+               return false;
+       return r1->start <= r2->start && r1->end >= r2->end;
+}
+
+/* True if any part of r1 overlaps r2 */
+static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
+{
+       return r1->start <= r2->end && r1->end >= r2->start;
+}
+
 /* Convenience shorthand with allocation */
 #define request_region(start,n,name)   __request_region(&ioport_resource, (start), (n), (name), 0)
 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)