CCN: Add API to query the PART0 ID from CCN
This patch adds the API `ccn_get_part0_id` to query the PART0 ID from the
PERIPHERAL_ID 0 register in the CCN driver. This ID allows to distinguish
the variant of CCN present on the system and possibly enable dynamic
configuration of the IP based on the variant. Also added an assert in
`ccn_master_to_rn_id_map()` to ensure that the master map bitfield provided
by the platform is within the expected interface id.
Change-Id: I92d2db7bd93a9be8a7fbe72a522cbcba0aba2d0e
diff --git a/drivers/arm/ccn/ccn.c b/drivers/arm/ccn/ccn.c
index 28d2709..060acdd 100644
--- a/drivers/arm/ccn/ccn.c
+++ b/drivers/arm/ccn/ccn.c
@@ -254,6 +254,7 @@
assert(ccn_plat_desc);
FOR_EACH_PRESENT_MASTER_INTERFACE(iface_id, master_map) {
+ assert(iface_id < ccn_plat_desc->num_masters);
/* Convert the master ID into the node ID */
node_id = ccn_plat_desc->master_to_rn_id_map[iface_id];
@@ -501,3 +502,15 @@
}
}
+
+/*******************************************************************************
+ * This function returns the part0 id from the peripheralID 0 register
+ * in CCN. This id can be used to distinguish the CCN variant present in the
+ * system.
+ ******************************************************************************/
+int ccn_get_part0_id(uintptr_t periphbase)
+{
+ assert(periphbase);
+ return (int)(mmio_read_64(periphbase
+ + MN_PERIPH_ID_0_1_OFFSET) & 0xFF);
+}