arc: define and use PTAG AUX regs for MMUv3 only

DC_PTAG and IC_PTAG registers only exist in MMUv3.

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

arch/arc/include/asm/arcregs.h

@@ -23,7 +23,7 @@
 #define ARC_AUX_IC_IVIC		0x10
 #define ARC_AUX_IC_CTRL		0x11
 #define ARC_AUX_IC_IVIL		0x19
-#if (CONFIG_ARC_MMU_VER > 2)
+#if (CONFIG_ARC_MMU_VER == 3)
 #define ARC_AUX_IC_PTAG		0x1E
 #endif
 #define ARC_BCR_IC_BUILD	0x77
@@ -42,7 +42,7 @@
 #define ARC_AUX_DC_IVDL		0x4A
 #define ARC_AUX_DC_FLSH		0x4B
 #define ARC_AUX_DC_FLDL		0x4C
-#if (CONFIG_ARC_MMU_VER > 2)
+#if (CONFIG_ARC_MMU_VER == 3)
 #define ARC_AUX_DC_PTAG		0x5C
 #endif
 #define ARC_BCR_DC_BUILD	0x72

arch/arc/lib/cache.c

@@ -101,7 +101,7 @@ void flush_dcache_all(void)
 #ifndef CONFIG_SYS_DCACHE_OFF
 static void dcache_flush_line(unsigned addr)
 {
-#if (CONFIG_ARC_MMU_VER > 2)
+#if (CONFIG_ARC_MMU_VER == 3)
 	write_aux_reg(ARC_AUX_DC_PTAG, addr);
 #endif
 	write_aux_reg(ARC_AUX_DC_FLDL, addr);
@@ -115,7 +115,7 @@ static void dcache_flush_line(unsigned addr)
 	 * Invalidate I$ for addresses range just flushed from D$.
 	 * If we try to execute data flushed above it will be valid/correct
 	 */
-#if (CONFIG_ARC_MMU_VER > 2)
+#if (CONFIG_ARC_MMU_VER == 3)
 	write_aux_reg(ARC_AUX_IC_PTAG, addr);
 #endif
 	write_aux_reg(ARC_AUX_IC_IVIL, addr);
@@ -145,7 +145,7 @@ void invalidate_dcache_range(unsigned long start, unsigned long end)
 	end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
 
 	for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) {
-#if (CONFIG_ARC_MMU_VER > 2)
+#if (CONFIG_ARC_MMU_VER == 3)
 		write_aux_reg(ARC_AUX_DC_PTAG, addr);
 #endif
 		write_aux_reg(ARC_AUX_DC_IVDL, addr);