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aspeed: ast2500: Add lowlevel_init assembly

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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>
This commit is contained in:
Chia-Wei, Wang 2020-08-03 17:36:06 +08:00 committed by Tom Rini
parent aff987c457
commit 611fe09577
3 changed files with 42 additions and 25 deletions
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25
arch/arm/mach-aspeed/ast2500-board.c
View file

@ -28,31 +28,6 @@
DECLARE_GLOBAL_DATA_PTR;
void lowlevel_init(void)
{
/*
* These two watchdogs need to be stopped as soon as possible,
* otherwise the board might hang. By default they are set to
* a very short timeout and even simple debug write to serial
* console early in the init process might cause them to fire.
*/
struct ast_wdt *flash_addr_wdt =
(struct ast_wdt *)(WDT_BASE +
sizeof(struct ast_wdt) *
AST_FLASH_ADDR_DETECT_WDT);
clrbits_le32(&flash_addr_wdt->ctrl, WDT_CTRL_EN);
#ifndef CONFIG_FIRMWARE_2ND_BOOT
struct ast_wdt *sec_boot_wdt =
(struct ast_wdt *)(WDT_BASE +
sizeof(struct ast_wdt) *
AST_2ND_BOOT_WDT);
clrbits_le32(&sec_boot_wdt->ctrl, WDT_CTRL_EN);
#endif
}
int board_init(void)
{
gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;

1
arch/arm/mach-aspeed/ast2500/Makefile
View file

@ -1 +1,2 @@
obj-y += lowlevel_init.o
obj-y += clk_ast2500.o sdram_ast2500.o

41
arch/arm/mach-aspeed/ast2500/lowlevel_init.S Normal file
View file

@ -0,0 +1,41 @@
/* 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