diff options
Diffstat (limited to 'arch/mips/mach-mtmips/mt7620/lowlevel_init.S')
| -rw-r--r-- | arch/mips/mach-mtmips/mt7620/lowlevel_init.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/mips/mach-mtmips/mt7620/lowlevel_init.S b/arch/mips/mach-mtmips/mt7620/lowlevel_init.S new file mode 100644 index 00000000000..399174620d5 --- /dev/null +++ b/arch/mips/mach-mtmips/mt7620/lowlevel_init.S @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 MediaTek Inc. + * + * Author: Weijie Gao <weijie.gao@mediatek.com> + */ + +#include <config.h> +#include <asm-offsets.h> +#include <asm/regdef.h> +#include <asm/asm.h> + + .set noreorder + +NESTED(lowlevel_init, 0, ra) + /* Save ra and do real lowlevel initialization */ + move s0, ra + + /* + * Use SRAM from 802.11n MAC/BBP, 16KiB (0x10184000 ~ 0x10187fff) + * NOTE: non-word operations may fail in this SRAM. + * Use it as stack only for CPU/DRAM init which only has word operations. + */ + PTR_LI sp, 0xb0187f00 + + /* We still need a temporary gd for udelay */ + PTR_SUBU \ + sp, sp, GD_SIZE # reserve space for gd + li t0, -16 + and sp, sp, t0 # force 16 byte alignment + move k0, sp # save gd pointer + + move fp, sp + + /* Clear gd */ + move t0, k0 +1: + PTR_S zero, 0(t0) + PTR_ADDIU t0, PTRSIZE + blt t0, t1, 1b + nop + + /* Do CPU & DRAM initialization */ + PTR_LA t9, mt7620_init + jalr t9 + nop + + /* Restore ra */ + move ra, s0 + + jr ra + nop + END(lowlevel_init) |