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
diff --git a/plat/arm/board/juno/juno_topology.c b/plat/arm/board/juno/juno_topology.c
new file mode 100644
index 0000000..ee4ec44
--- /dev/null
+++ b/plat/arm/board/juno/juno_topology.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arm_def.h>
+#include <plat_arm.h>
+#include "juno_def.h"
+
+/*
+ * On Juno, the system power level is the highest power level.
+ * The first entry in the power domain descriptor specifies the
+ * number of system power domains i.e. 1.
+ */
+#define JUNO_PWR_DOMAINS_AT_MAX_PWR_LVL ARM_SYSTEM_COUNT
+
+/*
+ * The Juno power domain tree descriptor. The cluster power domains
+ * are arranged so that when the PSCI generic code creates the power
+ * domain tree, the indices of the CPU power domain nodes it allocates
+ * match the linear indices returned by plat_core_pos_by_mpidr()
+ * i.e. CLUSTER1 CPUs are allocated indices from 0 to 3 and the higher
+ * indices for CLUSTER0 CPUs.
+ */
+const unsigned char juno_power_domain_tree_desc[] = {
+ /* No of root nodes */
+ JUNO_PWR_DOMAINS_AT_MAX_PWR_LVL,
+ /* No of children for the root node */
+ JUNO_CLUSTER_COUNT,
+ /* No of children for the first cluster node */
+ JUNO_CLUSTER1_CORE_COUNT,
+ /* No of children for the second cluster node */
+ JUNO_CLUSTER0_CORE_COUNT
+};
+
+/*******************************************************************************
+ * This function returns the Juno topology tree information.
+ ******************************************************************************/
+const unsigned char *plat_get_power_domain_tree_desc(void)
+{
+ return juno_power_domain_tree_desc;
+}
+
+/*******************************************************************************
+ * This function returns the core count within the cluster corresponding to
+ * `mpidr`.
+ ******************************************************************************/
+unsigned int plat_arm_get_cluster_core_count(u_register_t mpidr)
+{
+ return (((mpidr) & 0x100) ? JUNO_CLUSTER1_CORE_COUNT :\
+ JUNO_CLUSTER0_CORE_COUNT);
+}