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path: root/drivers/base/dma-coherent.c
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Diffstat (limited to 'drivers/base/dma-coherent.c')
-rw-r--r--drivers/base/dma-coherent.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index 87b808374888..25bb398ec7a1 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -2,6 +2,7 @@
* Coherent per-device memory handling.
* Borrowed from i386
*/
+#include <linux/io.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -31,7 +32,10 @@ static bool dma_init_coherent_memory(
if (!size)
goto out;
- mem_base = ioremap(phys_addr, size);
+ if (flags & DMA_MEMORY_MAP)
+ mem_base = memremap(phys_addr, size, MEMREMAP_WC);
+ else
+ mem_base = ioremap(phys_addr, size);
if (!mem_base)
goto out;
@@ -54,8 +58,12 @@ static bool dma_init_coherent_memory(
out:
kfree(dma_mem);
- if (mem_base)
- iounmap(mem_base);
+ if (mem_base) {
+ if (flags & DMA_MEMORY_MAP)
+ memunmap(mem_base);
+ else
+ iounmap(mem_base);
+ }
return false;
}
@@ -63,7 +71,11 @@ static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
{
if (!mem)
return;
- iounmap(mem->virt_base);
+
+ if (mem->flags & DMA_MEMORY_MAP)
+ memunmap(mem->virt_base);
+ else
+ iounmap(mem->virt_base);
kfree(mem->bitmap);
kfree(mem);
}