u-boot/arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S

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/*
* arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S
* This file is lager low level initialize.
*
* Copyright (C) 2013 Renesas Electronics Corporation
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <config.h>
#include <linux/linkage.h>
ENTRY(lowlevel_init)
mrc p15, 0, r4, c0, c0, 5 /* mpidr */
orr r4, r4, r4, lsr #6
and r4, r4, #7 /* id 0-3 = ca15.0,1,2,3 */
b do_lowlevel_init
.pool
/*
* CPU ID #1-#3 come here
*/
.align 4
do_cpu_waiting:
ldr r1, =0xe6180000 /* sysc */
1: ldr r0, [r1, #0x20] /* sbar */
tst r0, r0
beq 1b
bx r0
/*
* Only CPU ID #0 comes here
*/
.align 4
do_lowlevel_init:
/* surpress wfe if ca15 */
tst r4, #4
mrceq p15, 0, r0, c1, c0, 1 /* actlr */
orreq r0, r0, #(1<<7)
mcreq p15, 0, r0, c1, c0, 1
/* and set l2 latency */
mrceq p15, 1, r0, c9, c0, 2 /* l2ctlr */
orreq r0, r0, #0x00000800
orreq r0, r0, #0x00000003
mcreq p15, 1, r0, c9, c0, 2
ldr r3, =(CONFIG_SYS_INIT_SP_ADDR)
sub sp, r3, #4
str lr, [sp]
/* initialize system */
bl s_init
ldr lr, [sp]
mov pc, lr
nop
ENDPROC(lowlevel_init)
.ltorg