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/*
* arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S
* This file is lager low level initialize.
*
* Copyright (C) 2013, 2014 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:
ldr r2, =0xFF000044 /* PRR */
ldr r1, [r2]
and r1, r1, #0x7F00
lsrs r1, r1, #8
cmp r1, #0x4C /* 0x4C is ID of r8a7794 */
beq _enable_actlr_smp
/* 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 */
mrc p15, 0, r0, c0, c0, 5 /* r0 = MPIDR */
and r0, r0, #0xf00
lsr r0, r0, #8
tst r0, #1 /* only need for cluster 0 */
bne _exit_init_l2_a15
mrc p15, 1, r0, c9, c0, 2 /* r0 = L2CTLR */
and r1, r0, #7
cmp r1, #3 /* has already been set up */
bicne r0, r0, #0xe7
orrne r0, r0, #0x83 /* L2CTLR[7:6] + L2CTLR[2:0] */
#if defined(CONFIG_R8A7790)
orrne r0, r0, #0x20 /* L2CTLR[5] */
#endif
mcrne p15, 1, r0, c9, c0, 2
b _exit_init_l2_a15
_enable_actlr_smp: /* R8A7794 only (CA7) */
#ifndef CONFIG_DCACHE_OFF
mrc p15, 0, r0, c1, c0, 1
orr r0, r0, #0x40
mcr p15, 0, r0, c1, c0, 1
#endif
_exit_init_l2_a15:
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
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