In preparation for removing ioremap_cache() introduce arch_memremap()
for arm. For now, arch_memremap(..., MEMREMAP_WB) is an alias for
ioremap_cache(). Note that arch_memremap() is relying on memremap() to
handle remap requests to "System RAM".
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/io.h | 1 +
arch/arm/mm/ioremap.c | 11 +++++++++++
arch/arm/mm/nommu.c | 10 ++++++++++
arch/arm64/Kconfig | 1 +
arch/arm64/mm/ioremap.c | 10 ++++++++++
6 files changed, 34 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 72ad724c67ae..882771cfc63c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -3,6 +3,7 @@ config ARM
default y
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_ELF_RANDOMIZE
+ select ARCH_HAS_MEMREMAP
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAS_GCOV_PROFILE_ALL
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 485982084fe9..ca76d59cb6f3 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -356,6 +356,7 @@ static inline void memcpy_toio(volatile void __iomem *to, const void *from,
* ioremap() Device n/a n/a
* ioremap_nocache() Device n/a n/a
* ioremap_cache() Normal Writeback Read allocate
+ * memremap(WB) Normal Writeback Read allocate
* ioremap_wc() Normal Non-cacheable n/a
* ioremap_wt() Normal Non-cacheable n/a
*
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 0c81056c1dd7..f6249b98ed16 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -385,6 +385,17 @@ void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
}
EXPORT_SYMBOL(ioremap_cache);
+void *arch_memremap(resource_size_t res_cookie, size_t size,
+ unsigned long flags)
+{
+ if ((flags & MEMREMAP_WB) == 0)
+ return NULL;
+
+ return (void __force *) arch_ioremap_caller(res_cookie, size,
+ MT_DEVICE_CACHED, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(arch_memremap);
+
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{
return arch_ioremap_caller(res_cookie, size, MT_DEVICE_WC,
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
index 1dd10936d68d..d88353e1fe80 100644
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -373,6 +373,16 @@ void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
}
EXPORT_SYMBOL(ioremap_cache);
+void *arch_memremap(resource_size_t res_cookie, size_t size, unsigned long flags)
+{
+ if ((flags & MEMREMAP_WB) == 0)
+ return NULL;
+
+ return (void __force *) __arm_ioremap_caller(res_cookie, size,
+ MT_DEVICE_CACHED, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(arch_memremap);
+
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_WC,
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 07d1811aa03f..54ea0688586f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -6,6 +6,7 @@ config ARM64
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_GCOV_PROFILE_ALL
+ select ARCH_HAS_MEMREMAP
select ARCH_HAS_SG_CHAIN
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_USE_CMPXCHG_LOCKREF
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index 01e88c8bcab0..9db5a12654a0 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -104,6 +104,16 @@ void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
}
EXPORT_SYMBOL(ioremap_cache);
+void *arch_memremap(phys_addr_t phys_addr, size_t size, unsigned long flags)
+{
+ if ((flags & MEMREMAP_WB) == 0)
+ return NULL;
+
+ return (void __force *) __ioremap_caller(phys_addr, size,
+ __pgprot(PROT_NORMAL), __builtin_return_address(0));
+}
+EXPORT_SYMBOL(arch_memremap);
+
/*
* Must be called after early_fixmap_init
*/
--
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