82 lines
2 KiB
ArmAsm
82 lines
2 KiB
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2018 Chen-Yu Tsai
|
||
|
|
* Copyright (c) 2018 Bootlin
|
||
|
|
*
|
||
|
|
* Chen-Yu Tsai <wens@csie.org>
|
||
|
|
* Mylène 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 & 0xffff)
|
||
|
|
movt r2, #(ARM_CPU_PART_MASK >> 16)
|
||
|
|
and r1, r1, r2
|
||
|
|
movw r2, #(ARM_CPU_PART_CORTEX_A15 & 0xffff)
|
||
|
|
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, #(0x1 << 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, #(0x1 << 26)
|
||
|
|
/* Disable clean/evict from being pushed to external */
|
||
|
|
orr r1, r1, #(0x1<<3)
|
||
|
|
mcr p15, 1, r1, c15, c0, 0
|
||
|
|
|
||
|
|
/* L2CTRL: L2 data RAM latency */
|
||
|
|
mrc p15, 1, r1, c9, c0, 2
|
||
|
|
bic r1, r1, #(0x7 << 0)
|
||
|
|
orr r1, r1, #(0x3 << 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)
|