Blackfin arch: introducing bfin_addr_dcachable

This patch introduces bfin_addr_dcachable() predicate, that simply tests is
address in cachable region or not.

Signed-off-by: Bryan Wu <cooloney@kernel.org>

2 files changed, 15 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/cplbinit.h b/arch/blackfin/include/asm/cplbinit.h
index 9d23cd1ff7d9..d179b747ff03 100644
--- a/arch/blackfin/include/asm/cplbinit.h
+++ b/arch/blackfin/include/asm/cplbinit.h
@@ -92,4 +92,18 @@ extern unsigned long reserved_mem_icache_on;
 
 extern void generate_cplb_tables(void);
 
+static inline int bfin_addr_dcachable(unsigned long addr)
+{
+#ifdef CONFIG_BFIN_DCACHE
+        if (addr < (_ramend - DMA_UNCACHED_REGION))
+                return 1;
+#endif
+
+        if (reserved_mem_dcache_on &&
+                addr >= _ramend && addr < physical_mem_end)
+                return 1;
+
+        return 0;
+}
+
 #endif
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 7054594831c5..7f35d1046cd8 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -42,6 +42,7 @@ EXPORT_SYMBOL(memory_start);
 EXPORT_SYMBOL(memory_end);
 EXPORT_SYMBOL(physical_mem_end);
 EXPORT_SYMBOL(_ramend);
+EXPORT_SYMBOL(reserved_mem_dcache_on);
 
 #ifdef CONFIG_MTD_UCLINUX
 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;