diff options
| author | Anton Blanchard <anton@samba.org> | 2011-05-08 21:41:59 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-05-19 14:30:42 +1000 |
| commit | be135f40899cb3334faa7d2e27025055da311ec4 (patch) | |
| tree | 8dd20fc82c239562a16fdf9d8f32065e9927b231 /arch | |
| parent | f5f0307f42d39a51a925ca4841f76a2f2ea330ff (diff) | |
powerpc: Add ioremap_wc
Add ioremap_wc so drivers can request write combining on kernel
mappings.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/io.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 8 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 11 |
3 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index 2f365f5007a..662d2edae76 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -2,6 +2,8 @@ #define _ASM_POWERPC_IO_H #ifdef __KERNEL__ +#define ARCH_HAS_IOREMAP_WC + /* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -628,6 +630,8 @@ static inline void iosync(void) * * * ioremap_nocache is identical to ioremap * + * * ioremap_wc enables write combining + * * * iounmap undoes such a mapping and can be hooked * * * __ioremap_at (and the pending __iounmap_at) are low level functions to @@ -648,6 +652,7 @@ static inline void iosync(void) extern void __iomem *ioremap(phys_addr_t address, unsigned long size); extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size, unsigned long flags); +extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size); #define ioremap_nocache(addr, size) ioremap((addr), (size)) #define ioremap_prot(addr, size, prot) ioremap_flags((addr), (size), (prot)) diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 8dc41c0157f..fca98f8fb60 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -133,6 +133,14 @@ ioremap(phys_addr_t addr, unsigned long size) EXPORT_SYMBOL(ioremap); void __iomem * +ioremap_wc(phys_addr_t addr, unsigned long size) +{ + return __ioremap_caller(addr, size, _PAGE_NO_CACHE, + __builtin_return_address(0)); +} +EXPORT_SYMBOL(ioremap_wc); + +void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags) { /* writeable implies dirty for kernel addresses */ diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 88927a05cdc..1146fc6e892 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -255,6 +255,16 @@ void __iomem * ioremap(phys_addr_t addr, unsigned long size) return __ioremap_caller(addr, size, flags, caller); } +void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size) +{ + unsigned long flags = _PAGE_NO_CACHE; + void *caller = __builtin_return_address(0); + + if (ppc_md.ioremap) + return ppc_md.ioremap(addr, size, flags, caller); + return __ioremap_caller(addr, size, flags, caller); +} + void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags) { @@ -311,6 +321,7 @@ void iounmap(volatile void __iomem *token) } EXPORT_SYMBOL(ioremap); +EXPORT_SYMBOL(ioremap_wc); EXPORT_SYMBOL(ioremap_flags); EXPORT_SYMBOL(__ioremap); EXPORT_SYMBOL(__ioremap_at); |