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

   1 /*
   2  * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
   3  *
   4  * Copyright (C) 2011  Renesas Solutions Corp.
   5  * Copyright (C) 2011  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/spinlock.h>
  20 #include <linux/io.h>
  21 #include <linux/delay.h>
  22 #include <linux/soc/renesas/rcar-sysc.h>
  23
  24 #include <asm/cacheflush.h>
  25 #include <asm/smp_plat.h>
  26 #include <asm/smp_scu.h>
  27
  28 #include "common.h"
  29 #include "r8a7779.h"
  30
  31 #define AVECR IOMEM(0xfe700040)
  32 #define R8A7779_SCU_BASE 0xf0000000
  33
  34 static const struct rcar_sysc_ch r8a7779_ch_cpu1 = {
  35         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  36         .chan_bit = 1, /* ARM1 */
  37         .isr_bit = 1, /* ARM1 */
  38 };
  39
  40 static const struct rcar_sysc_ch r8a7779_ch_cpu2 = {
  41         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  42         .chan_bit = 2, /* ARM2 */
  43         .isr_bit = 2, /* ARM2 */
  44 };
  45
  46 static const struct rcar_sysc_ch r8a7779_ch_cpu3 = {
  47         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  48         .chan_bit = 3, /* ARM3 */
  49         .isr_bit = 3, /* ARM3 */
  50 };
  51
  52 static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = {
  53         [1] = &r8a7779_ch_cpu1,
  54         [2] = &r8a7779_ch_cpu2,
  55         [3] = &r8a7779_ch_cpu3,
  56 };
  57
  58 static int r8a7779_platform_cpu_kill(unsigned int cpu)
  59 {
  60         const struct rcar_sysc_ch *ch = NULL;
  61         int ret = -EIO;
  62
  63         cpu = cpu_logical_map(cpu);
  64
  65         if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
  66                 ch = r8a7779_ch_cpu[cpu];
  67
  68         if (ch)
  69                 ret = rcar_sysc_power_down(ch);
  70
  71         return ret ? ret : 1;
  72 }
  73
  74 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
  75 {
  76         const struct rcar_sysc_ch *ch = NULL;
  77         unsigned int lcpu = cpu_logical_map(cpu);
  78         int ret;
  79
  80         if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
  81                 ch = r8a7779_ch_cpu[lcpu];
  82
  83         if (ch)
  84                 ret = rcar_sysc_power_up(ch);
  85         else
  86                 ret = -EIO;
  87
  88         return ret;
  89 }
  90
  91 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
  92 {
  93         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
  94         __raw_writel(__pa(shmobile_boot_vector), AVECR);
  95
  96         /* setup r8a7779 specific SCU bits */
  97         shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
  98
  99         r8a7779_pm_init();
 100
 101         /* power off secondary CPUs */
 102         r8a7779_platform_cpu_kill(1);
 103         r8a7779_platform_cpu_kill(2);
 104         r8a7779_platform_cpu_kill(3);
 105 }
 106
 107 #ifdef CONFIG_HOTPLUG_CPU
 108 static int r8a7779_cpu_kill(unsigned int cpu)
 109 {
 110         if (shmobile_smp_scu_cpu_kill(cpu))
 111                 return r8a7779_platform_cpu_kill(cpu);
 112
 113         return 0;
 114 }
 115 #endif /* CONFIG_HOTPLUG_CPU */
 116
 117 const struct smp_operations r8a7779_smp_ops  __initconst = {
 118         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
 119         .smp_boot_secondary     = r8a7779_boot_secondary,
 120 #ifdef CONFIG_HOTPLUG_CPU
 121         .cpu_die                = shmobile_smp_scu_cpu_die,
 122         .cpu_kill               = r8a7779_cpu_kill,
 123 #endif
 124 };