Add SCMI support for Juno platform

This patch adds the memory map region for the SCMI payload memory
and maps the Juno core indices to SCMI power domains via the
`plat_css_core_pos_to_scmi_dmn_id_map` array.

Change-Id: I0d2bb2a719ff5b6a9d8e22e91e1625ab14453665
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

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

@@ -74,6 +74,11 @@
 						CSS_DEVICE_SIZE,	\
 						MT_DEVICE | MT_RW | MT_SECURE)
 
+#define CSS_MAP_NSRAM			MAP_REGION_FLAT(		\
+						NSRAM_BASE,	\
+						NSRAM_SIZE,	\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
 /* Platform ID address */
 #define SSC_VERSION_OFFSET			0x040
 

plat/arm/board/common/board_css_common.c

@@ -49,6 +49,15 @@ const mmap_region_t plat_arm_mmap[] = {
 	ARM_MAP_SHARED_RAM,
 	V2M_MAP_IOFPGA,
 	CSS_MAP_DEVICE,
+#if CSS_USE_SCMI_DRIVER
+	/*
+	 * The SCMI payload area is currently in the Non Secure SRAM. This is
+	 * a potential security risk but this will be resolved once SCP
+	 * completely replaces SCPI with SCMI as the only communication
+	 * protocol.
+	 */
+	CSS_MAP_NSRAM,
+#endif
 	SOC_CSS_MAP_DEVICE,
 	{0}
 };

plat/arm/board/juno/include/platform_def.h

@@ -74,8 +74,13 @@
 #endif
 
 #ifdef IMAGE_BL31
-# define PLAT_ARM_MMAP_ENTRIES		5
-# define MAX_XLAT_TABLES		2
+# if CSS_USE_SCMI_DRIVER
+#  define PLAT_ARM_MMAP_ENTRIES		6
+#  define MAX_XLAT_TABLES		3
+# else
+#  define PLAT_ARM_MMAP_ENTRIES		5
+#  define MAX_XLAT_TABLES		2
+# endif
 #endif
 
 #ifdef IMAGE_BL32

plat/arm/board/juno/juno_topology.c

@@ -51,3 +51,10 @@ unsigned int plat_arm_get_cluster_core_count(u_register_t mpidr)
 	return (((mpidr) & 0x100) ? JUNO_CLUSTER1_CORE_COUNT :\
 				JUNO_CLUSTER0_CORE_COUNT);
 }
+
+/*
+ * The array mapping platform core position (implemented by plat_my_core_pos())
+ * to the SCMI power domain ID implemented by SCP.
+ */
+const uint32_t plat_css_core_pos_to_scmi_dmn_id_map[PLATFORM_CORE_COUNT] = {
+			2, 3, 4, 5, 0, 1 };