LXR linux/arch/arm/mach-shmobile/smp-r8a7779.c

   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 AVECR IOMEM(0xfe700040)
  24#define R8A7779_SCU_BASE 0xf0000000
  25
  26static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
  27{
  28        int ret = -EIO;
  29
  30        cpu = cpu_logical_map(cpu);
  31        if (cpu)
  32                ret = rcar_sysc_power_up_cpu(cpu);
  33
  34        return ret;
  35}
  36
  37static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
  38{
  39        /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
  40        __raw_writel(__pa(shmobile_boot_vector), AVECR);
  41
  42        /* setup r8a7779 specific SCU bits */
  43        shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
  44}
  45
  46#ifdef CONFIG_HOTPLUG_CPU
  47static int r8a7779_platform_cpu_kill(unsigned int cpu)
  48{
  49        int ret = -EIO;
  50
  51        cpu = cpu_logical_map(cpu);
  52        if (cpu)
  53                ret = rcar_sysc_power_down_cpu(cpu);
  54
  55        return ret ? ret : 1;
  56}
  57
  58static int r8a7779_cpu_kill(unsigned int cpu)
  59{
  60        if (shmobile_smp_scu_cpu_kill(cpu))
  61                return r8a7779_platform_cpu_kill(cpu);
  62
  63        return 0;
  64}
  65#endif /* CONFIG_HOTPLUG_CPU */
  66
  67const struct smp_operations r8a7779_smp_ops  __initconst = {
  68        .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
  69        .smp_boot_secondary     = r8a7779_boot_secondary,
  70#ifdef CONFIG_HOTPLUG_CPU
  71        .cpu_die                = shmobile_smp_scu_cpu_die,
  72        .cpu_kill               = r8a7779_cpu_kill,
  73#endif
  74};
  75