imx: mx8m: add soc related settings and files
Add SoC level initialization code
- arch_cpu_init
- mmu table
- detect cpu revision
- reset cpu and wdog settings
- timer init
- wdog settings
- lowlevel init to save/restore registers
- a few dummy header file to avoid build failure
- ft_system_setup
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/arch/arm/mach-imx/mx8m/lowlevel_init.S b/arch/arm/mach-imx/mx8m/lowlevel_init.S
new file mode 100644
index 0000000..d388f3b
--- /dev/null
+++ b/arch/arm/mach-imx/mx8m/lowlevel_init.S
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2017 NXP
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+
+.align 8
+.global rom_pointer
+rom_pointer:
+ .space 256
+
+/*
+ * Routine: save_boot_params (called after reset from start.S)
+ */
+
+.global save_boot_params
+save_boot_params:
+ /* The firmware provided ATAG/FDT address can be found in r2/x0 */
+ adr x0, rom_pointer
+ stp x1, x2, [x0], #16
+ stp x3, x4, [x0], #16
+ stp x5, x6, [x0], #16
+ stp x7, x8, [x0], #16
+ stp x9, x10, [x0], #16
+ stp x11, x12, [x0], #16
+ stp x13, x14, [x0], #16
+ stp x15, x16, [x0], #16
+ stp x17, x18, [x0], #16
+ stp x19, x20, [x0], #16
+ stp x21, x22, [x0], #16
+ stp x23, x24, [x0], #16
+ stp x25, x26, [x0], #16
+ stp x27, x28, [x0], #16
+ stp x29, x30, [x0], #16
+ mov x30, sp
+ str x30, [x0], #8
+
+ /* Returns */
+ b save_boot_params_ret
+
+.global restore_boot_params
+restore_boot_params:
+ adr x0, rom_pointer
+ ldp x1, x2, [x0], #16
+ ldp x3, x4, [x0], #16
+ ldp x5, x6, [x0], #16
+ ldp x7, x8, [x0], #16
+ ldp x9, x10, [x0], #16
+ ldp x11, x12, [x0], #16
+ ldp x13, x14, [x0], #16
+ ldp x15, x16, [x0], #16
+ ldp x17, x18, [x0], #16
+ ldp x19, x20, [x0], #16
+ ldp x21, x22, [x0], #16
+ ldp x23, x24, [x0], #16
+ ldp x25, x26, [x0], #16
+ ldp x27, x28, [x0], #16
+ ldp x29, x30, [x0], #16
+ ldr x0, [x0]
+ mov sp, x0
+ ret