arch/arm/mach-shmobile/smp-r8a7790.c

   1 /*
   2  * SMP support for r8a7790
   3  *
   4  * Copyright (C) 2012-2013 Renesas Solutions Corp.
   5  * Copyright (C) 2012 Takashi Yoshii <takashi.yoshii.ze@renesas.com>
   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 #include <linux/soc/renesas/rcar-sysc.h>
  21
  22 #include <asm/smp_plat.h>
  23
  24 #include "common.h"
  25 #include "platsmp-apmu.h"
  26 #include "rcar-gen2.h"
  27 #include "r8a7790.h"
  28
  29 static const struct rcar_sysc_ch r8a7790_ca15_scu = {
  30         .chan_offs = 0x180, /* PWRSR5 .. PWRER5 */
  31         .isr_bit = 12, /* CA15-SCU */
  32 };
  33
  34 static const struct rcar_sysc_ch r8a7790_ca7_scu = {
  35         .chan_offs = 0x100, /* PWRSR3 .. PWRER3 */
  36         .isr_bit = 21, /* CA7-SCU */
  37 };
  38
  39 static struct rcar_apmu_config r8a7790_apmu_config[] = {
  40         {
  41                 .iomem = DEFINE_RES_MEM(0xe6152000, 0x188),
  42                 .cpus = { 0, 1, 2, 3 },
  43         },
  44         {
  45                 .iomem = DEFINE_RES_MEM(0xe6151000, 0x188),
  46                 .cpus = { 0x100, 0x0101, 0x102, 0x103 },
  47         }
  48 };
  49
  50 static void __init r8a7790_smp_prepare_cpus(unsigned int max_cpus)
  51 {
  52         /* let APMU code install data related to shmobile_boot_vector */
  53         shmobile_smp_apmu_prepare_cpus(max_cpus,
  54                                        r8a7790_apmu_config,
  55                                        ARRAY_SIZE(r8a7790_apmu_config));
  56
  57         /* turn on power to SCU */
  58         rcar_gen2_pm_init();
  59         rcar_sysc_power_up(&r8a7790_ca15_scu);
  60         rcar_sysc_power_up(&r8a7790_ca7_scu);
  61 }
  62
  63 const struct smp_operations r8a7790_smp_ops __initconst = {
  64         .smp_prepare_cpus       = r8a7790_smp_prepare_cpus,
  65         .smp_boot_secondary     = shmobile_smp_apmu_boot_secondary,
  66 #ifdef CONFIG_HOTPLUG_CPU
  67         .cpu_can_disable        = shmobile_smp_cpu_can_disable,
  68         .cpu_die                = shmobile_smp_apmu_cpu_die,
  69         .cpu_kill               = shmobile_smp_apmu_cpu_kill,
  70 #endif
  71 };