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>
CC: Catalin Marinas <catalin.marinas@xxxxxxx>
Tested-by: Robert Richter <rrichter@xxxxxxxxxx>
Acked-by: Robert Richter <rrichter@xxxxxxxxxx>
Signed-off-by: Mark Salter <msalter@xxxxxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
arch/arm64/include/asm/acpi.h | 13 +++++++++++++
include/acpi/acpi_io.h | 4 ++++
2 files changed, 17 insertions(+)
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 8b837ab..40e0924 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -12,8 +12,21 @@
#ifndef _ASM_ACPI_H
#define _ASM_ACPI_H
+#include <linux/mm.h>
+
/* Basic configuration for ACPI */
#ifdef CONFIG_ACPI
+/* ACPI table mapping after acpi_gbl_permanent_mmap is set */
+static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
+ acpi_size size)
+{
+ if (!page_is_ram(phys >> PAGE_SHIFT))
+ return ioremap(phys, size);
+
+ return ioremap_cache(phys, size);
+}
+#define acpi_os_ioremap acpi_os_ioremap
+
#define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */
extern int acpi_disabled;
extern int acpi_noirq;
diff --git a/include/acpi/acpi_io.h b/include/acpi/acpi_io.h
index 444671e..dd86c5f 100644
--- a/include/acpi/acpi_io.h
+++ b/include/acpi/acpi_io.h
@@ -3,11 +3,15 @@
#include <linux/io.h>
+#include <asm/acpi.h>
+
+#ifndef acpi_os_ioremap
static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
acpi_size size)
{
return ioremap_cache(phys, size);
}
+#endif
void __iomem *__init_refok
acpi_os_map_iomem(acpi_physical_address phys, acpi_size size);
--
1.9.1
--
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