[U-Boot] [PATCH v5] dm: core: implement dev_map_physmem()

[Vignesh R]

This API helps to map physical register addresss pace of device to
virtual address space easily. Its just a wrapper around map_physmem()
with MAP_NOCACHE flag.


Signed-off-by: Vignesh R <vigneshr at ti.com>
Suggested-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Jagan Teki <jteki at openedev.com>
---

v5: Fix comments by Simon Glass <sjg at chromium.org>

 drivers/core/device.c | 11 +++++++++++
 include/dm/device.h   | 13 +++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/core/device.c b/drivers/core/device.c
index 1322991d6c7b..0406fc82f8d1 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 #include <fdtdec.h>
 #include <fdt_support.h>
 #include <malloc.h>
@@ -678,6 +679,16 @@ void *dev_get_addr_ptr(struct udevice *dev)
 	return (void *)(uintptr_t)dev_get_addr_index(dev, 0);
 }
 
+void *dev_map_physmem(struct udevice *dev, unsigned long size)
+{
+	fdt_addr_t addr = dev_get_addr(dev);
+
+	if (addr == FDT_ADDR_T_NONE)
+		return NULL;
+
+	return map_physmem(addr, size, MAP_NOCACHE);
+}
+
 bool device_has_children(struct udevice *dev)
 {
 	return !list_empty(&dev->child_head);
diff --git a/include/dm/device.h b/include/dm/device.h
index 8970fc015c7e..9509c0b72ccb 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -464,6 +464,19 @@ fdt_addr_t dev_get_addr(struct udevice *dev);
 void *dev_get_addr_ptr(struct udevice *dev);
 
 /**
+ * dev_map_physmem() - Read device address from reg property of the
+ *                     device node and map the address into CPU address
+ *                     space.
+ *
+ * @dev: Pointer to device
+ * @size: size of the memory to map
+ *
+ * @return  mapped address, or NULL if the device does not have reg
+ *          property.
+ */
+void *dev_map_physmem(struct udevice *dev, unsigned long size);
+
+/**
  * dev_get_addr_index() - Get the indexed reg property of a device
  *
  * @dev: Pointer to a device
-- 
2.8.2