ARC: Cache: Allways check D$ status before entire/line ops

As we are planning to get rid of dozens of ifdef's in cache.c we
would better check D$ status before each entire/line operation
then check CONFIG_SYS_DCACHE_OFF config option.

This makes the code cleaner as well as D$ entire/line functions
remain functional even if we enable or disable D$ in run-time.

As we need to check status before *each* function execution and we
call D$ entire/line functions from different places we add
this check directly into D$ entire/line functions instead of
their callers to avoid code duplication.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

arch/arc/lib/cache.c

@@ -398,7 +398,6 @@ void dcache_disable(void)
 		      DC_CTRL_CACHE_DISABLE);
 }
 
-#ifndef CONFIG_SYS_DCACHE_OFF
 /* Common Helper for Line Operations on D-cache */
 static inline void __dcache_line_loop(unsigned long paddr, unsigned long sz,
 				      const int cacheop)
@@ -448,6 +447,9 @@ static inline void __dc_entire_op(const int cacheop)
 {
 	int aux;
 
+	if (!dcache_status())
+		return;
+
 	__before_dc_op(cacheop);
 
 	if (cacheop & OP_INV)	/* Inv or flush-n-inv use same cmd reg */
@@ -463,14 +465,13 @@ static inline void __dc_entire_op(const int cacheop)
 static inline void __dc_line_op(unsigned long paddr, unsigned long sz,
 				const int cacheop)
 {
+	if (!dcache_status())
+		return;
+
 	__before_dc_op(cacheop);
 	__dcache_line_loop(paddr, sz, cacheop);
 	__after_dc_op(cacheop);
 }
-#else
-#define __dc_entire_op(cacheop)
-#define __dc_line_op(paddr, sz, cacheop)
-#endif /* !CONFIG_SYS_DCACHE_OFF */
 
 void invalidate_dcache_range(unsigned long start, unsigned long end)
 {