Allow multi cluster topology definitions for ARM platforms

The common topology description helper funtions and macros for
ARM Standard platforms assumed a dual cluster system. This is not
flexible enough to scale to multi cluster platforms. This patch does
the following changes for more flexibility in defining topology:

1. The `plat_get_power_domain_tree_desc()` definition is moved from
   `arm_topology.c` to platform specific files, that is `fvp_topology.c`
   and `juno_topology.c`. Similarly the common definition of the porting
   macro `PLATFORM_CORE_COUNT` in `arm_def.h` is moved to platform
   specific `platform_def.h` header.

2. The ARM common layer porting macros which were dual cluster specific
   are now removed and a new macro PLAT_ARM_CLUSTER_COUNT is introduced
   which must be defined by each ARM standard platform.

3. A new mandatory ARM common layer porting API
   `plat_arm_get_cluster_core_count()` is introduced to enable the common
   implementation of `arm_check_mpidr()` to validate MPIDR.

4. For the FVP platforms, a new build option `FVP_NUM_CLUSTERS` has been
   introduced which allows the user to specify the cluster count to be
   used to build the topology tree within Trusted Firmare. This enables
   Trusted Firmware to be built for multi cluster FVP models.

Change-Id: Ie7a2e38e5661fe2fdb2c8fdf5641d2b2614c2b6b

1 files changed, 1 insertions, 0 deletions

diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index 8d7e83b5..e9eebaa0 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -179,6 +179,7 @@ int arm_io_is_toc_valid(void);
 /*
  * Mandatory functions required in ARM standard platforms
  */
+unsigned int plat_arm_get_cluster_core_count(u_register_t mpidr);
 void plat_arm_gic_driver_init(void);
 void plat_arm_gic_init(void);
 void plat_arm_gic_cpuif_enable(void);