nios2: add flush_dcache_range function

exposes functionality to flush dcache according to
the common.h API

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

diff --git a/arch/nios2/lib/cache.S b/arch/nios2/lib/cache.S
index ee3b4b79bf1a3d96810e4b9d65bdbf4605656534..b952d0c901aefa80f9fe1517fa88a1cece9f5972 100644 (file)
--- a/arch/nios2/lib/cache.S
+++ b/arch/nios2/lib/cache.S
@@ -48,6 +48,16 @@ flush_icache:
        bltu    r4, r5, 1b
        ret
 
+       .global flush_dcache_range
+
+flush_dcache_range:
+       movhi   r8, %hi(CONFIG_SYS_DCACHELINE_SIZE)
+       ori     r8, r8, %lo(CONFIG_SYS_DCACHELINE_SIZE)
+0:     flushd  0(r4)
+       add     r4, r4, r8
+       bltu    r4, r5, 0b
+       ret
+
        .global flush_cache
 
 flush_cache: