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ACPI: fix acpi_os_ioremap for arm64

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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@rjwysocki.net>
CC: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Robert Richter <rrichter@cavium.com>
Tested-by: Timur Tabi <timur@codeaurora.org>
Acked-by: Robert Richter <rrichter@cavium.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Salter 2015-03-24 14:02:38 +00:00 committed by Will Deacon
parent 37655163ce
commit 652261a7a8
2 changed files with 17 additions and 0 deletions
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13
arch/arm64/include/asm/acpi.h
View File

@ -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;

4
include/acpi/acpi_io.h
View File

@ -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);