arm: dcc: Add uart dcc support for armv8

Added UART DCC support for armv8

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

drivers/serial/arm_dcc.c

@@ -61,6 +61,22 @@
 #define status_dcc(x)	\
 		__asm__ volatile ("mrc p14, 0, %0, c14, c0, 0\n" : "=r" (x))
 
+#elif defined(CONFIG_CPU_ARMV8)
+/*
+ * ARMV8
+ */
+#define DCC_RBIT	(1 << 30)
+#define DCC_WBIT	(1 << 29)
+
+#define write_dcc(x)   \
+		__asm__ volatile ("msr dbgdtrtx_el0, %0\n" : : "r" (x))
+
+#define read_dcc(x)    \
+		__asm__ volatile ("mrs %0, dbgdtrrx_el0\n" : "=r" (x))
+
+#define status_dcc(x)  \
+		__asm__ volatile ("mrs %0, mdccsr_el0\n" : "=r" (x))
+
 #else
 #define DCC_RBIT	(1 << 0)
 #define DCC_WBIT	(1 << 1)