u-boot/arch/arm/mach-rmobile/lowlevel_init_gen3.S
Marek Vasut 4fa8375ffe ARM: renesas: Save boot parameters passed in by ATF
The ATF can pass additional information via the first four registers,
x0...x3. The R-Car Gen3 with mainline ATF, register x1 contains pointer
to a device tree with platform information. Save these registers for
future use.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2019-04-09 18:19:09 +02:00

97 lines
1.9 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* arch/arm/cpu/armv8/rcar_gen3/lowlevel_init.S
* This file is lowlevel initialize routine.
*
* (C) Copyright 2015 Renesas Electronics Corporation
*
* This file is based on the arch/arm/cpu/armv8/start.S
*
* (C) Copyright 2013
* David Feng <fenghua@phytium.com.cn>
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
#include <asm/macro.h>
.align 8
.globl rcar_atf_boot_args
rcar_atf_boot_args:
.dword 0
.dword 0
.dword 0
.dword 0
ENTRY(save_boot_params)
adr x8, rcar_atf_boot_args
stp x0, x1, [x8], #16
stp x2, x3, [x8], #16
b save_boot_params_ret
ENDPROC(save_boot_params)
ENTRY(lowlevel_init)
mov x29, lr /* Save LR */
#ifndef CONFIG_ARMV8_MULTIENTRY
/*
* For single-entry systems the lowlevel init is very simple.
*/
ldr x0, =GICD_BASE
bl gic_init_secure
#else /* CONFIG_ARMV8_MULTIENTRY is set */
#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
branch_if_slave x0, 1f
ldr x0, =GICD_BASE
bl gic_init_secure
1:
#if defined(CONFIG_GICV3)
ldr x0, =GICR_BASE
bl gic_init_secure_percpu
#elif defined(CONFIG_GICV2)
ldr x0, =GICD_BASE
ldr x1, =GICC_BASE
bl gic_init_secure_percpu
#endif
#endif
branch_if_master x0, x1, 2f
/*
* Slave should wait for master clearing spin table.
* This sync prevent salves observing incorrect
* value of spin table and jumping to wrong place.
*/
#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
#ifdef CONFIG_GICV2
ldr x0, =GICC_BASE
#endif
bl gic_wait_for_interrupt
#endif
/*
* All slaves will enter EL2 and optionally EL1.
*/
adr x4, lowlevel_in_el2
ldr x5, =ES_TO_AARCH64
bl armv8_switch_to_el2
lowlevel_in_el2:
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
adr x4, lowlevel_in_el1
ldr x5, =ES_TO_AARCH64
bl armv8_switch_to_el1
lowlevel_in_el1:
#endif
#endif /* CONFIG_ARMV8_MULTIENTRY */
bl s_init
2:
mov lr, x29 /* Restore LR */
ret
ENDPROC(lowlevel_init)