platsmp.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright (C) 2019 Lubomir Rintel <lkundrak@v3.sk>
 4 */
 5#include <linux/io.h>
 6#include <asm/smp_scu.h>
 7#include <asm/smp.h>
 8#include "addr-map.h"
 9
10#define SW_BRANCH_VIRT_ADDR	CIU_REG(0x24)
11
12static int mmp3_boot_secondary(unsigned int cpu, struct task_struct *idle)
13{
14	/*
15	 * Apparently, the boot ROM on the second core spins on this
16	 * register becoming non-zero and then jumps to the address written
17	 * there. No IPIs involved.
18	 */
19	__raw_writel(__pa_symbol(secondary_startup), SW_BRANCH_VIRT_ADDR);
20	return 0;
21}
22
23static void mmp3_smp_prepare_cpus(unsigned int max_cpus)
24{
25	scu_enable(SCU_VIRT_BASE);
26}
27
28static const struct smp_operations mmp3_smp_ops __initconst = {
29	.smp_prepare_cpus	= mmp3_smp_prepare_cpus,
30	.smp_boot_secondary	= mmp3_boot_secondary,
31};
32CPU_METHOD_OF_DECLARE(mmp3_smp, "marvell,mmp3-smp", &mmp3_smp_ops);