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-rw-r--r--target/linux/brcm47xx/patches-2.6.31/160-kmap_coherent.patch77
1 files changed, 77 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-2.6.31/160-kmap_coherent.patch b/target/linux/brcm47xx/patches-2.6.31/160-kmap_coherent.patch
new file mode 100644
index 0000000000..5c06f3a4ea
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.31/160-kmap_coherent.patch
@@ -0,0 +1,77 @@
+--- a/arch/mips/include/asm/cpu-features.h
++++ b/arch/mips/include/asm/cpu-features.h
+@@ -104,6 +104,9 @@
+ #ifndef cpu_has_pindexed_dcache
+ #define cpu_has_pindexed_dcache (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX)
+ #endif
++#ifndef cpu_use_kmap_coherent
++#define cpu_use_kmap_coherent 1
++#endif
+
+ /*
+ * I-Cache snoops remote store. This only matters on SMP. Some multiprocessors
+--- /dev/null
++++ b/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
+@@ -0,0 +1,13 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
++ */
++#ifndef __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
++#define __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
++
++#define cpu_use_kmap_coherent 0
++
++#endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
+--- a/arch/mips/mm/c-r4k.c
++++ b/arch/mips/mm/c-r4k.c
+@@ -507,7 +507,7 @@ static inline void local_r4k_flush_cache
+ */
+ map_coherent = (cpu_has_dc_aliases &&
+ page_mapped(page) && !Page_dcache_dirty(page));
+- if (map_coherent)
++ if (map_coherent && cpu_use_kmap_coherent)
+ vaddr = kmap_coherent(page, addr);
+ else
+ vaddr = kmap_atomic(page, KM_USER0);
+@@ -530,7 +530,7 @@ static inline void local_r4k_flush_cache
+ }
+
+ if (vaddr) {
+- if (map_coherent)
++ if (map_coherent && cpu_use_kmap_coherent)
+ kunmap_coherent();
+ else
+ kunmap_atomic(vaddr, KM_USER0);
+--- a/arch/mips/mm/init.c
++++ b/arch/mips/mm/init.c
+@@ -205,7 +205,7 @@ void copy_user_highpage(struct page *to,
+ void *vfrom, *vto;
+
+ vto = kmap_atomic(to, KM_USER1);
+- if (cpu_has_dc_aliases &&
++ if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
+ page_mapped(from) && !Page_dcache_dirty(from)) {
+ vfrom = kmap_coherent(from, vaddr);
+ copy_page(vto, vfrom);
+@@ -227,7 +227,7 @@ void copy_to_user_page(struct vm_area_st
+ struct page *page, unsigned long vaddr, void *dst, const void *src,
+ unsigned long len)
+ {
+- if (cpu_has_dc_aliases &&
++ if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
+ page_mapped(page) && !Page_dcache_dirty(page)) {
+ void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+ memcpy(vto, src, len);
+@@ -245,7 +245,7 @@ void copy_from_user_page(struct vm_area_
+ struct page *page, unsigned long vaddr, void *dst, const void *src,
+ unsigned long len)
+ {
+- if (cpu_has_dc_aliases &&
++ if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
+ page_mapped(page) && !Page_dcache_dirty(page)) {
+ void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+ memcpy(dst, vfrom, len);