powerpc/32: define helpers to get L1 cache sizes.

This patch defines C helpers to retrieve the size of
cache blocks and uses them in the cacheflush functions.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 29 insertions, 11 deletions

diff --git a/arch/powerpc/include/asm/cache.h b/arch/powerpc/include/asm/cache.h
index df8e4c407366..e84d1622eeb6 100644
--- a/arch/powerpc/include/asm/cache.h
+++ b/arch/powerpc/include/asm/cache.h
@@ -33,7 +33,8 @@
 
 #define IFETCH_ALIGN_BYTES      (1 << IFETCH_ALIGN_SHIFT)
 
-#if defined(__powerpc64__) && !defined(__ASSEMBLY__)
+#if !defined(__ASSEMBLY__)
+#ifdef CONFIG_PPC64
 
 struct ppc_cache_info {
         u32 size;
@@ -53,7 +54,18 @@ struct ppc64_caches {
 };
 
 extern struct ppc64_caches ppc64_caches;
-#endif /* __powerpc64__ && ! __ASSEMBLY__ */
+#else
+static inline u32 l1_cache_shift(void)
+{
+        return L1_CACHE_SHIFT;
+}
+
+static inline u32 l1_cache_bytes(void)
+{
+        return L1_CACHE_BYTES;
+}
+#endif
+#endif /* ! __ASSEMBLY__ */
 
 #if defined(__ASSEMBLY__)
 /*
diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
index 69b6c3d78d6c..217f183aa8c4 100644
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -67,11 +67,13 @@ static inline void __flush_dcache_icache_phys(unsigned long physaddr)
  */
 static inline void flush_dcache_range(unsigned long start, unsigned long stop)
 {
-        void *addr = (void *)(start & ~(L1_CACHE_BYTES - 1));
-        unsigned long size = stop - (unsigned long)addr + (L1_CACHE_BYTES - 1);
+        unsigned long shift = l1_cache_shift();
+        unsigned long bytes = l1_cache_bytes();
+        void *addr = (void *)(start & ~(bytes - 1));
+        unsigned long size = stop - (unsigned long)addr + (bytes - 1);
         unsigned long i;
 
-        for (i = 0; i < size >> L1_CACHE_SHIFT; i++, addr += L1_CACHE_BYTES)
+        for (i = 0; i < size >> shift; i++, addr += bytes)
                 dcbf(addr);
         mb();   /* sync */
 }
@@ -83,11 +85,13 @@ static inline void flush_dcache_range(unsigned long start, unsigned long stop)
  */
 static inline void clean_dcache_range(unsigned long start, unsigned long stop)
 {
-        void *addr = (void *)(start & ~(L1_CACHE_BYTES - 1));
-        unsigned long size = stop - (unsigned long)addr + (L1_CACHE_BYTES - 1);
+        unsigned long shift = l1_cache_shift();
+        unsigned long bytes = l1_cache_bytes();
+        void *addr = (void *)(start & ~(bytes - 1));
+        unsigned long size = stop - (unsigned long)addr + (bytes - 1);
         unsigned long i;
 
-        for (i = 0; i < size >> L1_CACHE_SHIFT; i++, addr += L1_CACHE_BYTES)
+        for (i = 0; i < size >> shift; i++, addr += bytes)
                 dcbst(addr);
         mb();   /* sync */
 }
@@ -100,11 +104,13 @@ static inline void clean_dcache_range(unsigned long start, unsigned long stop)
 static inline void invalidate_dcache_range(unsigned long start,
                                            unsigned long stop)
 {
-        void *addr = (void *)(start & ~(L1_CACHE_BYTES - 1));
-        unsigned long size = stop - (unsigned long)addr + (L1_CACHE_BYTES - 1);
+        unsigned long shift = l1_cache_shift();
+        unsigned long bytes = l1_cache_bytes();
+        void *addr = (void *)(start & ~(bytes - 1));
+        unsigned long size = stop - (unsigned long)addr + (bytes - 1);
         unsigned long i;
 
-        for (i = 0; i < size >> L1_CACHE_SHIFT; i++, addr += L1_CACHE_BYTES)
+        for (i = 0; i < size >> shift; i++, addr += bytes)
                 dcbi(addr);
         mb();   /* sync */
 }