Add devm_arch_io_reserve_memtype_wc() as managed wrapper around
arch_io_reserve_memtype_wc(). Useful for several grahpics drivers
that set framebuffer memory to write combining.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
include/linux/io.h | 3 +++
lib/devres.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/include/linux/io.h b/include/linux/io.h
index fcd8ea79c5df..5fc800390fe4 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -168,4 +168,7 @@ static inline void arch_io_free_memtype_wc(resource_size_t base,
}
#endif
+int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
+ resource_size_t size);
+
#endif /* _LINUX_IO_H */
diff --git a/lib/devres.c b/lib/devres.c
index 24d4d849ff67..14664bbb4875 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -564,3 +564,49 @@ int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long
return ret;
}
EXPORT_SYMBOL(devm_arch_phys_wc_add);
+
+struct arch_io_reserve_memtype_wc_devres {
+ resource_size_t start;
+ resource_size_t size;
+};
+
+static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)
+{
+ const struct arch_io_reserve_memtype_wc_devres *this = res;
+
+ arch_io_free_memtype_wc(this->start, this->size);
+}
+
+/**
+ * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()
+ * @dev: Managed device
+ * @start: Memory base address
+ * @size: Size of memory range
+ *
+ * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()
+ * and sets up a release callback See arch_io_reserve_memtype_wc() for more
+ * information.
+ */
+int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
+ resource_size_t size)
+{
+ struct arch_io_reserve_memtype_wc_devres *dr;
+ int ret;
+
+ dr = devres_alloc(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ ret = arch_io_reserve_memtype_wc(start, size);
+ if (ret < 0) {
+ devres_free(dr);
+ return ret;
+ }
+
+ dr->start = start;
+ dr->size = size;
+ devres_add(dev, dr);
+
+ return ret;
+}
+EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);
--
2.33.0
