linux/arch/arm/mach-shmobile/smp-r8a7779.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
   4 *
   5 * Copyright (C) 2011  Renesas Solutions Corp.
   6 * Copyright (C) 2011  Magnus Damm
   7 */
   8#include <linux/kernel.h>
   9#include <linux/init.h>
  10#include <linux/smp.h>
  11#include <linux/spinlock.h>
  12#include <linux/io.h>
  13#include <linux/delay.h>
  14#include <linux/soc/renesas/rcar-sysc.h>
  15
  16#include <asm/cacheflush.h>
  17#include <asm/smp_plat.h>
  18#include <asm/smp_scu.h>
  19
  20#include "common.h"
  21#include "r8a7779.h"
  22
  23#define HPBREG_BASE             0xfe700000
  24#define AVECR                   0x0040  /* ARM Reset Vector Address Register */
  25
  26#define R8A7779_SCU_BASE        0xf0000000
  27
  28static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
  29{
  30        int ret = -EIO;
  31
  32        cpu = cpu_logical_map(cpu);
  33        if (cpu)
  34                ret = rcar_sysc_power_up_cpu(cpu);
  35
  36        return ret;
  37}
  38
  39static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
  40{
  41        void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
  42
  43        /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
  44        writel(__pa(shmobile_boot_vector), base + AVECR);
  45
  46        /* setup r8a7779 specific SCU bits */
  47        shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
  48
  49        iounmap(base);
  50}
  51
  52#ifdef CONFIG_HOTPLUG_CPU
  53static int r8a7779_platform_cpu_kill(unsigned int cpu)
  54{
  55        int ret = -EIO;
  56
  57        cpu = cpu_logical_map(cpu);
  58        if (cpu)
  59                ret = rcar_sysc_power_down_cpu(cpu);
  60
  61        return ret ? ret : 1;
  62}
  63
  64static int r8a7779_cpu_kill(unsigned int cpu)
  65{
  66        if (shmobile_smp_scu_cpu_kill(cpu))
  67                return r8a7779_platform_cpu_kill(cpu);
  68
  69        return 0;
  70}
  71#endif /* CONFIG_HOTPLUG_CPU */
  72
  73const struct smp_operations r8a7779_smp_ops  __initconst = {
  74        .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
  75        .smp_boot_secondary     = r8a7779_boot_secondary,
  76#ifdef CONFIG_HOTPLUG_CPU
  77        .cpu_die                = shmobile_smp_scu_cpu_die,
  78        .cpu_kill               = r8a7779_cpu_kill,
  79#endif
  80};
  81