[PATCH v5 2/4] lib: devres: add a helper function for ioremap_uc

[Tuowen Zhao]

Implement a resource managed strongly uncachable ioremap function.

Cc: <sta...@vger.kernel.org>
Tested-by: AceLan Kao <acelan....@canonical.com>
Signed-off-by: Tuowen Zhao <ztuo...@gmail.com>
Acked-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Acked-by: Luis Chamberlain <mcg...@kernel.org>
Acked-for-MFD-by: Lee Jones <lee.jo...@linaro.org>
---
 include/linux/io.h |  2 ++
 lib/devres.c       | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/linux/io.h b/include/linux/io.h
index accac822336a..a59834bc0a11 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -64,6 +64,8 @@ static inline void devm_ioport_unmap(struct device *dev, void 
__iomem *addr)
 
 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
                           resource_size_t size);
+void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
+                                  resource_size_t size);
 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
                                   resource_size_t size);
 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
diff --git a/lib/devres.c b/lib/devres.c
index 6a0e9bd6524a..17624d35e82d 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -9,6 +9,7 @@
 enum devm_ioremap_type {
        DEVM_IOREMAP = 0,
        DEVM_IOREMAP_NC,
+       DEVM_IOREMAP_UC,
        DEVM_IOREMAP_WC,
 };
 
@@ -39,6 +40,9 @@ static void __iomem *__devm_ioremap(struct device *dev, 
resource_size_t offset,
        case DEVM_IOREMAP_NC:
                addr = ioremap_nocache(offset, size);
                break;
+       case DEVM_IOREMAP_UC:
+               addr = ioremap_uc(offset, size);
+               break;
        case DEVM_IOREMAP_WC:
                addr = ioremap_wc(offset, size);
                break;
@@ -68,6 +72,21 @@ void __iomem *devm_ioremap(struct device *dev, 
resource_size_t offset,
 }
 EXPORT_SYMBOL(devm_ioremap);
 
+/**
+ * devm_ioremap_uc - Managed ioremap_uc()
+ * @dev: Generic device to remap IO address for
+ * @offset: Resource address to map
+ * @size: Size of map
+ *
+ * Managed ioremap_uc().  Map is automatically unmapped on driver detach.
+ */
+void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
+                             resource_size_t size)
+{
+       return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
+}
+EXPORT_SYMBOL_GPL(devm_ioremap_uc);
+
 /**
  * devm_ioremap_nocache - Managed ioremap_nocache()
  * @dev: Generic device to remap IO address for
-- 
2.23.0