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authorMarkos Chandras <markos.chandras@imgtec.com>2014-07-18 10:51:33 +0100
committerRalf Baechle <ralf@linux-mips.org>2014-09-22 13:35:53 +0200
commit4b050ba7a66c3ff26cc329ea4db0e9fb2d66a064 (patch)
treefa1d1accffcd5bc39694d19e33a9cf82ffd47cc5 /arch/mips/include/asm/pgtable.h
parent4f12b91d2da577d81c580da62373fd37b31e0da1 (diff)
downloadlinux-stericsson-4b050ba7a66c3ff26cc329ea4db0e9fb2d66a064.tar.gz
MIPS: pgtable.h: Implement the pgprot_writecombine function for MIPS
Previously, the pgprot_writecombine function was simply defined as pgprot_uncached in include/asm-generic/pgtable.h. This is not optimal for cores that can actually do write-combine memory writes so define this function to take into account the core's cache coherency attribute to achieve such behavior. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7403/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/pgtable.h')
-rw-r--r--arch/mips/include/asm/pgtable.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index df49a308085c..d6d1928539b1 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -366,6 +366,16 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
return __pgprot(prot);
}
+static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
+{
+ unsigned long prot = pgprot_val(_prot);
+
+ /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
+ prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
+
+ return __pgprot(prot);
+}
+
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.