mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
611fe09577
The original lowlevel_init function of AST2500 is written in C. However, the C runtime environment is not ready until _main execution. This patch adds the assembly version of the lowlevel_init function. Additional initialization to DRAM configuration and LPC reset source are also added. Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
41 lines
862 B
ArmAsm
41 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
|