| Chia-Wei, Wang | 2122210 | 2020-08-03 17:36:06 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
| 2 | /* |
| 3 | * Copyright (C) ASPEED Technology Inc. |
| 4 | */ |
| 5 | #include <asm/arch/scu_ast2500.h> |
| 6 | |
| 7 | /* registers for low level init */ |
| 8 | #define SCU_PROT_KEY 0x1e6e2000 |
| 9 | #define SCU_VGA_HANDSHAKE 0x1e6e2040 |
| 10 | #define SCU_HW_STRAP 0x1e6e2070 |
| 11 | #define SCU_HW_STRAP_CLR 0x1e6e207c |
| 12 | #define WDT3_CTRL 0x1e78504c |
| 13 | |
| 14 | .global lowlevel_init |
| 15 | lowlevel_init: |
| 16 | |
| 17 | /* unlock SCU */ |
| 18 | ldr r0, =SCU_PROT_KEY |
| 19 | ldr r1, =SCU_UNLOCK_VALUE |
| 20 | str r1, [r0] |
| 21 | |
| 22 | /* set BMC FW as DRAM initializer */ |
| 23 | ldr r0, =SCU_VGA_HANDSHAKE |
| 24 | ldr r1, [r0] |
| 25 | orr r1, #0x80 |
| 26 | str r1, [r0] |
| 27 | |
| 28 | /* set PERST# as LPC reset source if eSPI mode is enabled*/ |
| 29 | ldr r0, =SCU_HW_STRAP |
| 30 | ldr r1, [r0] |
| 31 | tst r1, #(0x1 << 25) |
| 32 | ldrne r0, =SCU_HW_STRAP_CLR |
| 33 | movne r1, #(0x1 << 14) |
| 34 | strne r1, [r0] |
| 35 | |
| 36 | /* disable WDT3 for SPI 3/4 bytes auto-detection */ |
| 37 | ldr r0, =WDT3_CTRL |
| 38 | mov r1, #0x0 |
| 39 | str r1, [r0] |
| 40 | |
| 41 | mov pc, lr |