| /* 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) |
