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https://github.com/AsahiLinux/u-boot
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4fa8375ffe
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>
97 lines
1.9 KiB
ArmAsm
97 lines
1.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* arch/arm/cpu/armv8/rcar_gen3/lowlevel_init.S
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* This file is lowlevel initialize routine.
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*
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* (C) Copyright 2015 Renesas Electronics Corporation
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*
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* This file is based on the arch/arm/cpu/armv8/start.S
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*
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* (C) Copyright 2013
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* David Feng <fenghua@phytium.com.cn>
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/macro.h>
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.align 8
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.globl rcar_atf_boot_args
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rcar_atf_boot_args:
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.dword 0
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.dword 0
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.dword 0
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.dword 0
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ENTRY(save_boot_params)
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adr x8, rcar_atf_boot_args
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stp x0, x1, [x8], #16
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stp x2, x3, [x8], #16
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b save_boot_params_ret
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ENDPROC(save_boot_params)
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ENTRY(lowlevel_init)
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mov x29, lr /* Save LR */
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#ifndef CONFIG_ARMV8_MULTIENTRY
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/*
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* For single-entry systems the lowlevel init is very simple.
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*/
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ldr x0, =GICD_BASE
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bl gic_init_secure
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#else /* CONFIG_ARMV8_MULTIENTRY is set */
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#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
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branch_if_slave x0, 1f
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ldr x0, =GICD_BASE
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bl gic_init_secure
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1:
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#if defined(CONFIG_GICV3)
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ldr x0, =GICR_BASE
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bl gic_init_secure_percpu
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#elif defined(CONFIG_GICV2)
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ldr x0, =GICD_BASE
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ldr x1, =GICC_BASE
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bl gic_init_secure_percpu
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#endif
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#endif
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branch_if_master x0, x1, 2f
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/*
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* Slave should wait for master clearing spin table.
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* This sync prevent salves observing incorrect
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* value of spin table and jumping to wrong place.
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*/
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#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
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#ifdef CONFIG_GICV2
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ldr x0, =GICC_BASE
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#endif
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bl gic_wait_for_interrupt
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#endif
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/*
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* All slaves will enter EL2 and optionally EL1.
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*/
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adr x4, lowlevel_in_el2
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ldr x5, =ES_TO_AARCH64
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bl armv8_switch_to_el2
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lowlevel_in_el2:
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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adr x4, lowlevel_in_el1
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ldr x5, =ES_TO_AARCH64
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bl armv8_switch_to_el1
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lowlevel_in_el1:
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#endif
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#endif /* CONFIG_ARMV8_MULTIENTRY */
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bl s_init
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2:
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mov lr, x29 /* Restore LR */
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ret
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ENDPROC(lowlevel_init)
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