Add CCN support to FVP platform port

This patch adds support to select CCN driver for FVP during build.
A new build option `FVP_INTERCONNECT_DRIVER` is added to allow
selection between the CCI and CCN driver. Currently only the CCN-502
variant is supported on FVP.

The common ARM CCN platform helper file now verifies the cluster
count declared by platform is equal to the number of root node
masters exported by the ARM Standard platform.

Change-Id: I71d7b4785f8925ed499c153b2e9b9925fcefd57a

docs/user-guide.md

@@ -496,6 +496,14 @@ map is explained in the [Firmware Design].
      for functions that wait for an arbitrary time length (udelay and mdelay).
      The default value is 0.
 
+*    `FVP_INTERCONNECT_DRIVER`: Selects the interconnect driver to be built. The
+     default interconnect driver depends on the value of `FVP_CLUSTER_COUNT` as
+     explained in the options below:
+     -    `FVP_CCI`           : The CCI driver is selected. This is the default
+                                if 0 < `FVP_CLUSTER_COUNT` <= 2.
+     -    `FVP_CCN`           : The CCN driver is selected. This is the default
+                                if `FVP_CLUSTER_COUNT` > 2.
+
 ### Debugging options
 
 To compile a debug version and make the build more verbose use

plat/arm/board/fvp/fvp_common.c

@@ -30,6 +30,7 @@
 
 #include <arm_config.h>
 #include <arm_def.h>
+#include <ccn.h>
 #include <debug.h>
 #include <gicv2.h>
 #include <mmio.h>
@@ -213,8 +214,16 @@ void fvp_config_setup(void)
 
 void fvp_interconnect_init(void)
 {
-	if (arm_config.flags & ARM_CONFIG_HAS_INTERCONNECT)
+	if (arm_config.flags & ARM_CONFIG_HAS_INTERCONNECT) {
+#if FVP_INTERCONNECT_DRIVER == FVP_CCN
+		if (ccn_get_part0_id(PLAT_ARM_CCN_BASE) != CCN_502_PART0_ID) {
+			ERROR("Unrecognized CCN variant detected. Only CCN-502"
+					" is supported");
+			panic();
+		}
+#endif
 		plat_arm_interconnect_init();
+	}
 }
 
 void fvp_interconnect_enable(void)

plat/arm/board/fvp/fvp_def.h

@@ -40,6 +40,10 @@
 
 #define FVP_PRIMARY_CPU			0x0
 
+/* Defines for the Interconnect build selection */
+#define FVP_CCI			1
+#define FVP_CCN			2
+
 /*******************************************************************************
  * FVP memory map related constants
  ******************************************************************************/
@@ -57,16 +61,23 @@
 #define DEVICE0_BASE			0x20000000
 #define DEVICE0_SIZE			0x0c200000
 
+/*
+ *  In case of FVP models with CCN, the CCN register space overlaps into
+ *  the NSRAM area.
+ */
+#if FVP_INTERCONNECT_DRIVER == FVP_CCN
+#define DEVICE1_BASE			0x2e000000
+#define DEVICE1_SIZE			0x1A00000
+#else
 #define DEVICE1_BASE			0x2f000000
 #define DEVICE1_SIZE			0x200000
-
+#define NSRAM_BASE			0x2e000000
+#define NSRAM_SIZE			0x10000
+#endif
 /* Devices in the second GB */
 #define DEVICE2_BASE			0x7fe00000
 #define DEVICE2_SIZE			0x00200000
 
-#define NSRAM_BASE			0x2e000000
-#define NSRAM_SIZE			0x10000
-
 #define PCIE_EXP_BASE			0x40000000
 #define TZRNG_BASE			0x7fe60000
 

plat/arm/board/fvp/include/plat_macros.S

@@ -64,7 +64,9 @@ use_ve_mmap:
 	mov_imm	x16, VE_GICD_BASE
 print_gic_regs:
 	arm_print_gic_regs
+#if FVP_INTERCONNECT_DRIVER == FVP_CCI
 	print_cci_regs
+#endif
 	.endm
 
 #endif /* __PLAT_MACROS_S__ */

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

@@ -90,6 +90,10 @@
 #define PLAT_ARM_CCI_CLUSTER0_SL_IFACE_IX	3
 #define PLAT_ARM_CCI_CLUSTER1_SL_IFACE_IX	4
 
+/* CCN related constants. Only CCN 502 is currently supported */
+#define PLAT_ARM_CCN_BASE		0x2e000000
+#define PLAT_ARM_CLUSTER_TO_CCN_ID_MAP	1, 5, 7, 11
+
 /* System timer related constants */
 #define PLAT_ARM_NSTIMER_FRAME_ID		1
 

plat/arm/board/fvp/platform.mk

@@ -39,11 +39,22 @@ $(eval $(call add_define,FVP_USE_SP804_TIMER))
 # The FVP platform depends on this macro to build with correct GIC driver.
 $(eval $(call add_define,FVP_USE_GIC_DRIVER))
 
-# If FVP_CLUSTER_COUNT has been defined, pass it into the build system.
-ifdef FVP_CLUSTER_COUNT
+# Define default FVP_CLUSTER_COUNT to 2 and pass it into the build system.
+FVP_CLUSTER_COUNT	:= 2
 $(eval $(call add_define,FVP_CLUSTER_COUNT))
+
+# Sanity check the cluster count and if FVP_CLUSTER_COUNT <= 2,
+# choose the CCI driver , else the CCN driver
+ifeq ($(FVP_CLUSTER_COUNT), 0)
+$(error "Incorrect cluster count specified for FVP port")
+else ifeq ($(FVP_CLUSTER_COUNT),$(filter $(FVP_CLUSTER_COUNT),1 2))
+FVP_INTERCONNECT_DRIVER := FVP_CCI
+else
+FVP_INTERCONNECT_DRIVER := FVP_CCN
 endif
 
+$(eval $(call add_define,FVP_INTERCONNECT_DRIVER))
+
 # Choose the GIC sources depending upon the how the FVP will be invoked
 ifeq (${FVP_USE_GIC_DRIVER}, FVP_GICV3)
 FVP_GIC_SOURCES		:=	drivers/arm/gic/common/gic_common.c	\
@@ -67,8 +78,15 @@ else
 $(error "Incorrect GIC driver chosen on FVP port")
 endif
 
+ifeq (${FVP_INTERCONNECT_DRIVER}, FVP_CCI)
 FVP_INTERCONNECT_SOURCES	:= 	drivers/arm/cci/cci.c		\
 					plat/arm/common/arm_cci.c
+else ifeq (${FVP_INTERCONNECT_DRIVER}, FVP_CCN)
+FVP_INTERCONNECT_SOURCES	:= 	drivers/arm/ccn/ccn.c		\
+					plat/arm/common/arm_ccn.c
+else
+$(error "Incorrect CCN driver chosen on FVP port")
+endif
 
 FVP_SECURITY_SOURCES	:=	drivers/arm/tzc/tzc400.c		\
 				plat/arm/board/fvp/fvp_security.c	\

plat/arm/common/arm_ccn.c

@@ -43,6 +43,9 @@ static const ccn_desc_t arm_ccn_desc = {
 	.master_to_rn_id_map = master_to_rn_id_map
 };
 
+CASSERT(PLAT_ARM_CLUSTER_COUNT == ARRAY_SIZE(master_to_rn_id_map),
+		assert_invalid_cluster_count_for_ccn_variant);
+
 /******************************************************************************
  * The following functions are defined as weak to allow a platform to override
  * the way ARM CCN driver is initialised and used.