/* SPDX-License-Identifier: GPL-2.0
*
* Copyright ( c ) 2018 Chen - Yu Tsai
* Copyright ( c ) 2018 Bootlin
*
* Chen - Yu Tsai < wens @ csie . org >
* Myl è ne Josserand < mylene . josserand @ bootlin . com >
*
* SMP support for sunxi based systems with Cortex A7 / A15
*
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/cputype.h>
ENTRY(sunxi_mc_smp_cluster_cache_enable)
.arch armv7-a
/*
* Enable cluster - level coherency , in preparation for turning on the MMU .
*
* Also enable regional clock gating and L2 data latency settings for
* Cortex - A15 . These settings are from the vendor kernel .
*/
mrc p15, 0 , r1, c0, c0, 0
movw r2, #(ARM_CPU_PART_MASK & 0 xffff)
movt r2, #(ARM_CPU_PART_MASK >> 16 )
and r1, r1, r2
movw r2, #(ARM_CPU_PART_CORTEX_A15 & 0 xffff)
movt r2, #(ARM_CPU_PART_CORTEX_A15 >> 16 )
cmp r1, r2
bne not_a15
/* The following is Cortex-A15 specific */
/* ACTLR2: Enable CPU regional clock gates */
mrc p15, 1 , r1, c15, c0, 4
orr r1, r1, #(0 x1 << 31 )
mcr p15, 1 , r1, c15, c0, 4
/* L2ACTLR */
mrc p15, 1 , r1, c15, c0, 0
/* Enable L2, GIC, and Timer regional clock gates */
orr r1, r1, #(0 x1 << 26 )
/* Disable clean/evict from being pushed to external */
orr r1, r1, #(0 x1<<3 )
mcr p15, 1 , r1, c15, c0, 0
/* L2CTRL: L2 data RAM latency */
mrc p15, 1 , r1, c9, c0, 2
bic r1, r1, #(0 x7 << 0 )
orr r1, r1, #(0 x3 << 0 )
mcr p15, 1 , r1, c9, c0, 2
/* End of Cortex-A15 specific setup */
not_a15:
/* Get value of sunxi_mc_smp_first_comer */
adr r1, first
ldr r0, [r1]
ldr r0, [r1, r0]
/* Skip cci_enable_port_for_self if not first comer */
cmp r0, #0
bxeq lr
b cci_enable_port_for_self
.align 2
first: .word sunxi_mc_smp_first_comer - .
ENDPROC(sunxi_mc_smp_cluster_cache_enable)
ENTRY(sunxi_mc_smp_secondary_startup)
bl sunxi_mc_smp_cluster_cache_enable
bl secure_cntvoff_init
b secondary_startup
ENDPROC(sunxi_mc_smp_secondary_startup)
ENTRY(sunxi_mc_smp_resume)
bl sunxi_mc_smp_cluster_cache_enable
b cpu_resume
ENDPROC(sunxi_mc_smp_resume)
Messung V0.5 in Prozent C=87 H=100 G=93
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-29)
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