allwinner: Introduce basic platform support
This platform supports Allwinner's SoCs with ARMv8 cores. So far they
all sport a single cluster of Cortex-A53 cores.
"sunxi" is the original code name used for this platform, and since it
appears in the Linux kernel and in U-Boot as well, we use it here as a
short file name prefix and for identifiers.
This port includes BL31 support only. U-Boot's SPL takes the role of the
primary loader, also doing the DRAM initialization. It then loads the
rest of the firmware, namely ATF and U-Boot (BL33), then hands execution
over to ATF.
This commit includes the basic platform code shared across all SoCs.
There is no platform.mk yet.
[Andre: moved files into proper directories, supported RESET_TO_BL31,
various clean ups and simplifications ]
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/allwinner/common/plat_helpers.S b/plat/allwinner/common/plat_helpers.S
new file mode 100644
index 0000000..b00c7ae
--- /dev/null
+++ b/plat/allwinner/common/plat_helpers.S
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <sunxi_def.h>
+#include <sunxi_mmap.h>
+
+ .globl plat_crash_console_init
+ .globl plat_crash_console_putc
+ .globl plat_crash_console_flush
+ .globl plat_my_core_pos
+ .globl platform_mem_init
+ .globl plat_report_exception
+
+func plat_crash_console_init
+ mov_imm x0, SUNXI_UART0_BASE
+ mov_imm x1, SUNXI_UART0_CLK_IN_HZ
+ mov_imm x2, SUNXI_UART0_BAUDRATE
+ b console_16550_core_init
+endfunc plat_crash_console_init
+
+func plat_crash_console_putc
+ mov_imm x1, SUNXI_UART0_BASE
+ b console_16550_core_putc
+endfunc plat_crash_console_putc
+
+func plat_crash_console_flush
+ ret
+endfunc plat_crash_console_flush
+
+func plat_my_core_pos
+ mrs x0, mpidr_el1
+ and x1, x0, #MPIDR_CLUSTER_MASK
+ and x0, x0, #MPIDR_CPU_MASK
+ add x0, x0, x1, LSR #6
+ ret
+endfunc plat_my_core_pos
+
+func platform_mem_init
+ ret
+endfunc platform_mem_init
+
+func plat_report_exception
+ ret
+endfunc plat_report_exception