mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-27 12:28:52 +09:00
42 lines
862 B
ArmAsm
42 lines
862 B
ArmAsm
![]() |
/* SPDX-License-Identifier: GPL-2.0+ */
|
||
|
/*
|
||
|
* Copyright (C) ASPEED Technology Inc.
|
||
|
*/
|
||
|
#include <asm/arch/scu_ast2500.h>
|
||
|
|
||
|
/* registers for low level init */
|
||
|
#define SCU_PROT_KEY 0x1e6e2000
|
||
|
#define SCU_VGA_HANDSHAKE 0x1e6e2040
|
||
|
#define SCU_HW_STRAP 0x1e6e2070
|
||
|
#define SCU_HW_STRAP_CLR 0x1e6e207c
|
||
|
#define WDT3_CTRL 0x1e78504c
|
||
|
|
||
|
.global lowlevel_init
|
||
|
lowlevel_init:
|
||
|
|
||
|
/* unlock SCU */
|
||
|
ldr r0, =SCU_PROT_KEY
|
||
|
ldr r1, =SCU_UNLOCK_VALUE
|
||
|
str r1, [r0]
|
||
|
|
||
|
/* set BMC FW as DRAM initializer */
|
||
|
ldr r0, =SCU_VGA_HANDSHAKE
|
||
|
ldr r1, [r0]
|
||
|
orr r1, #0x80
|
||
|
str r1, [r0]
|
||
|
|
||
|
/* set PERST# as LPC reset source if eSPI mode is enabled*/
|
||
|
ldr r0, =SCU_HW_STRAP
|
||
|
ldr r1, [r0]
|
||
|
tst r1, #(0x1 << 25)
|
||
|
ldrne r0, =SCU_HW_STRAP_CLR
|
||
|
movne r1, #(0x1 << 14)
|
||
|
strne r1, [r0]
|
||
|
|
||
|
/* disable WDT3 for SPI 3/4 bytes auto-detection */
|
||
|
ldr r0, =WDT3_CTRL
|
||
|
mov r1, #0x0
|
||
|
str r1, [r0]
|
||
|
|
||
|
mov pc, lr
|