[U-Boot] [PATCH v3] nios2: Pseudo implement dcache_status/enable/disable()

[Joachim Foerster]

AFAIK the NIOS2 architecture does not have any possibility to
dynamically switch off the data cache. So _status() always reports 1 and
_enable/_disable() just issue a flush of everything.

For example, common/cmd_elf.c depends on these symbols.

Signed-off-by: Joachim Foerster <joachim.foerster at missinglinkelectronics.com>
---
Changes for v3:
	- #include proper header file for flush_dcache()
Changes for v2:
        - Remove return; from added void functions

 arch/nios2/cpu/cpu.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch/nios2/cpu/cpu.c b/arch/nios2/cpu/cpu.c
index ef360ee..edf2560 100644
--- a/arch/nios2/cpu/cpu.c
+++ b/arch/nios2/cpu/cpu.c
@@ -24,6 +24,7 @@
 #include <common.h>
 #include <nios2.h>
 #include <nios2-io.h>
+#include <asm/cache.h>
 
 #if defined (CONFIG_SYS_NIOS_SYSID_BASE)
 extern void display_sysid (void);
@@ -47,3 +48,18 @@ int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	nios2_callr(CONFIG_SYS_RESET_ADDR);
 	return 0;
 }
+
+int dcache_status(void)
+{
+	return 1;
+}
+
+void dcache_enable(void)
+{
+	flush_dcache(CONFIG_SYS_DCACHE_SIZE, CONFIG_SYS_DCACHELINE_SIZE);
+}
+
+void dcache_disable(void)
+{
+	flush_dcache(CONFIG_SYS_DCACHE_SIZE, CONFIG_SYS_DCACHELINE_SIZE);
+}
-- 
1.7.6