refactor(juno): disable non-invasive debug of secure state

Disable non-invasive debug of secure state for Juno
in release builds. This makes sure that PMU counts
only Non-secure events.
Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I0d1c3f96f3b4e48360a7211ae55851d65d291025

include/plat/arm/css/common/css_def.h

 /*
- * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -137,6 +137,8 @@
 #define SSC_DBGCFG_SET		0x14
 #define SSC_DBGCFG_CLR		0x18
 
+#define SPNIDEN_INT_CLR_SHIFT	4
+#define SPNIDEN_SEL_SET_SHIFT	5
 #define SPIDEN_INT_CLR_SHIFT	6
 #define SPIDEN_SEL_SET_SHIFT	7
 

plat/arm/board/juno/juno_security.c

 /*
- * Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -115,6 +115,14 @@ static void init_debug_cfg(void)
 	/* Drive SPIDEN LOW to disable invasive debug of secure state. */
 	mmio_write_32(SSC_REG_BASE + SSC_DBGCFG_CLR,
 		1U << SPIDEN_INT_CLR_SHIFT);
+
+	/* Set internal drive selection for SPNIDEN. */
+	mmio_write_32(SSC_REG_BASE + SSC_DBGCFG_SET,
+		1U << SPNIDEN_SEL_SET_SHIFT);
+
+	/* Drive SPNIDEN LOW to disable non-invasive debug of secure state. */
+	mmio_write_32(SSC_REG_BASE + SSC_DBGCFG_CLR,
+		1U << SPNIDEN_INT_CLR_SHIFT);
 #endif
 }