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
  26 static 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
  37 static 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
  47 static 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
  58 static 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
  67 const 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 };