iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: mmp: add SMP support

Browse Source 
Used to bring up the second core on MMP3.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
This commit is contained in:
Lubomir Rintel 2019-06-26 23:42:19 +02:00
parent a9372a5fb2
commit d093bc0378
2 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/mach-mmp/Makefile
View File

@ -22,6 +22,9 @@ ifeq ($(CONFIG_PM),y)
obj-$(CONFIG_CPU_PXA910) += pm-pxa910.o
obj-$(CONFIG_CPU_MMP2) += pm-mmp2.o
endif
ifeq ($(CONFIG_SMP),y)
obj-$(CONFIG_MACH_MMP3_DT) += platsmp.o
endif
# board support
obj-$(CONFIG_MACH_ASPENITE) += aspenite.o

32
arch/arm/mach-mmp/platsmp.c Normal file
View File

@ -0,0 +1,32 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Lubomir Rintel <lkundrak@v3.sk>
*/
#include <linux/io.h>
#include <asm/smp_scu.h>
#include <asm/smp.h>
#include "addr-map.h"
#define SW_BRANCH_VIRT_ADDR CIU_REG(0x24)
static int mmp3_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
/*
* Apparently, the boot ROM on the second core spins on this
* register becoming non-zero and then jumps to the address written
* there. No IPIs involved.
*/
__raw_writel(__pa_symbol(secondary_startup), SW_BRANCH_VIRT_ADDR);
return 0;
}
static void mmp3_smp_prepare_cpus(unsigned int max_cpus)
{
scu_enable(SCU_VIRT_BASE);
}
static const struct smp_operations mmp3_smp_ops __initconst = {
.smp_prepare_cpus = mmp3_smp_prepare_cpus,
.smp_boot_secondary = mmp3_boot_secondary,
};
CPU_METHOD_OF_DECLARE(mmp3_smp, "marvell,mmp3-smp", &mmp3_smp_ops);