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Linux/arch/arm/mach-mmp/platsmp.c

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  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 
 12 static 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 
 23 static void mmp3_smp_prepare_cpus(unsigned int max_cpus)
 24 {
 25         scu_enable(SCU_VIRT_BASE);
 26 }
 27 
 28 static const struct smp_operations mmp3_smp_ops __initconst = {
 29         .smp_prepare_cpus       = mmp3_smp_prepare_cpus,
 30         .smp_boot_secondary     = mmp3_boot_secondary,
 31 };
 32 CPU_METHOD_OF_DECLARE(mmp3_smp, "marvell,mmp3-smp", &mmp3_smp_ops);
 33 

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