arch/arm/mach-shmobile/smp-r8a7791.c

   1 /*
   2  * SMP support for r8a7791
   3  *
   4  * Copyright (C) 2013 Renesas Solutions Corp.
   5  * Copyright (C) 2013 Magnus Damm
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/smp.h>
  19 #include <linux/io.h>
  20
  21 #include <asm/smp_plat.h>
  22
  23 #include "common.h"
  24 #include "platsmp-apmu.h"
  25 #include "r8a7791.h"
  26 #include "rcar-gen2.h"
  27
  28 static struct rcar_apmu_config r8a7791_apmu_config[] = {
  29         {
  30                 .iomem = DEFINE_RES_MEM(0xe6152000, 0x188),
  31                 .cpus = { 0, 1 },
  32         }
  33 };
  34
  35 static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus)
  36 {
  37         /* let APMU code install data related to shmobile_boot_vector */
  38         shmobile_smp_apmu_prepare_cpus(max_cpus,
  39                                        r8a7791_apmu_config,
  40                                        ARRAY_SIZE(r8a7791_apmu_config));
  41
  42         rcar_gen2_pm_init();
  43 }
  44
  45 static int r8a7791_smp_boot_secondary(unsigned int cpu,
  46                                       struct task_struct *idle)
  47 {
  48         /* Error out when hardware debug mode is enabled */
  49         if (rcar_gen2_read_mode_pins() & BIT(21)) {
  50                 pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu);
  51                 return -ENOTSUPP;
  52         }
  53
  54         return shmobile_smp_apmu_boot_secondary(cpu, idle);
  55 }
  56
  57 struct smp_operations r8a7791_smp_ops __initdata = {
  58         .smp_prepare_cpus       = r8a7791_smp_prepare_cpus,
  59         .smp_boot_secondary     = r8a7791_smp_boot_secondary,
  60 #ifdef CONFIG_HOTPLUG_CPU
  61         .cpu_can_disable        = shmobile_smp_cpu_can_disable,
  62         .cpu_die                = shmobile_smp_apmu_cpu_die,
  63         .cpu_kill               = shmobile_smp_apmu_cpu_kill,
  64 #endif
  65 };