Initialize platform for MediaTek MT8195
- Add basic platform setup
- Add MT8195 documentation at docs/plat/
- Add generic CPU helper functions
- Add basic register address
Change-Id: I7978e2f32e58900e5cf93f741ee8eaf8b8e3b842
diff --git a/plat/mediatek/mt8195/aarch64/plat_helpers.S b/plat/mediatek/mt8195/aarch64/plat_helpers.S
new file mode 100644
index 0000000..a973f4d
--- /dev/null
+++ b/plat/mediatek/mt8195/aarch64/plat_helpers.S
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <platform_def.h>
+
+ .globl plat_is_my_cpu_primary
+ .globl plat_my_core_pos
+ .globl plat_mediatek_calc_core_pos
+
+func plat_is_my_cpu_primary
+ mrs x0, mpidr_el1
+ and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)
+ cmp x0, #PLAT_PRIMARY_CPU
+ cset x0, eq
+ ret
+endfunc plat_is_my_cpu_primary
+
+ /* -----------------------------------------------------
+ * unsigned int plat_my_core_pos(void)
+ * This function uses the plat_mediatek_calc_core_pos()
+ * definition to get the index of the calling CPU.
+ * -----------------------------------------------------
+ */
+func plat_my_core_pos
+ mrs x0, mpidr_el1
+ b plat_mediatek_calc_core_pos
+endfunc plat_my_core_pos
+
+ /* -----------------------------------------------------
+ * unsigned int plat_mediatek_calc_core_pos(u_register_t mpidr);
+ *
+ * In ARMv8.2, AFF2 is cluster id, AFF1 is core id and
+ * AFF0 is thread id. There is only one cluster in ARMv8.2
+ * and one thread in current implementation.
+ *
+ * With this function: CorePos = CoreID (AFF1)
+ * we do it with x0 = (x0 >> 8) & 0xff
+ * -----------------------------------------------------
+ */
+func plat_mediatek_calc_core_pos
+ mov x1, #MPIDR_AFFLVL_MASK
+ and x0, x1, x0, lsr #MPIDR_AFF1_SHIFT
+ ret
+endfunc plat_mediatek_calc_core_pos