LXR linux/arch/arm/mach-mmp/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);
  33