| /* |
| * Lowlevel setup for SMDK5250 board based on S5PC520 |
| * |
| * Copyright (C) 2012 Samsung Electronics |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <config.h> |
| #include <version.h> |
| #include <asm/arch/cpu.h> |
| |
| _TEXT_BASE: |
| .word CONFIG_SYS_TEXT_BASE |
| |
| .globl lowlevel_init |
| lowlevel_init: |
| |
| /* use iRAM stack in bl2 */ |
| ldr sp, =CONFIG_IRAM_STACK |
| stmdb r13!, {ip,lr} |
| |
| /* check reset status */ |
| ldr r0, =(EXYNOS5_POWER_BASE + INFORM1_OFFSET) |
| ldr r1, [r0] |
| |
| /* AFTR wakeup reset */ |
| ldr r2, =S5P_CHECK_DIDLE |
| cmp r1, r2 |
| beq exit_wakeup |
| |
| /* LPA wakeup reset */ |
| ldr r2, =S5P_CHECK_LPA |
| cmp r1, r2 |
| beq exit_wakeup |
| |
| /* Sleep wakeup reset */ |
| ldr r2, =S5P_CHECK_SLEEP |
| cmp r1, r2 |
| beq wakeup_reset |
| |
| /* |
| * If U-boot is already running in RAM, no need to relocate U-Boot. |
| * Memory controller must be configured before relocating U-Boot |
| * in ram. |
| */ |
| ldr r0, =0x0ffffff /* r0 <- Mask Bits*/ |
| bic r1, pc, r0 /* pc <- current addr of code */ |
| /* r1 <- unmasked bits of pc */ |
| ldr r2, _TEXT_BASE /* r2 <- original base addr in ram */ |
| bic r2, r2, r0 /* r2 <- unmasked bits of r2*/ |
| cmp r1, r2 /* compare r1, r2 */ |
| beq 1f /* r0 == r1 then skip sdram init */ |
| |
| /* init system clock */ |
| bl system_clock_init |
| |
| /* Memory initialize */ |
| bl mem_ctrl_init |
| |
| 1: |
| bl arch_cpu_init |
| bl tzpc_init |
| ldmia r13!, {ip,pc} |
| |
| wakeup_reset: |
| bl system_clock_init |
| bl mem_ctrl_init |
| bl arch_cpu_init |
| bl tzpc_init |
| |
| exit_wakeup: |
| /* Load return address and jump to kernel */ |
| ldr r0, =(EXYNOS5_POWER_BASE + INFORM0_OFFSET) |
| |
| /* r1 = physical address of exynos5_cpu_resume function*/ |
| ldr r1, [r0] |
| |
| /* Jump to kernel */ |
| mov pc, r1 |
| nop |
| nop |