From: Mark Salter <msalter@xxxxxxxxxx>
The acpi_os_ioremap() function may be used to map normal RAM or IO
regions. The current implementation simply uses ioremap_cache(). This
will work for some architectures, but arm64 ioremap_cache() cannot be
used to map IO regions which don't support caching. So for arm64, use
ioremap() for non-RAM regions.
CC: Rafael J Wysocki <rjw@xxxxxxxxxxxxx>
Signed-off-by: Mark Salter <msalter@xxxxxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
include/acpi/acpi_io.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/acpi/acpi_io.h b/include/acpi/acpi_io.h
index 444671e..9d573db 100644
--- a/include/acpi/acpi_io.h
+++ b/include/acpi/acpi_io.h
@@ -1,11 +1,17 @@
#ifndef _ACPI_IO_H_
#define _ACPI_IO_H_
+#include <linux/mm.h>
#include <linux/io.h>
static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
acpi_size size)
{
+#ifdef CONFIG_ARM64
+ if (!page_is_ram(phys >> PAGE_SHIFT))
+ return ioremap(phys, size);
+#endif
+
return ioremap_cache(phys, size);
}
--
1.9.1
--
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