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
  23 #include <asm/cacheflush.h>
  24 #include <asm/smp_plat.h>
  25 #include <asm/smp_scu.h>
  26 #include <asm/smp_twd.h>
  27
  28 #include "common.h"
  29 #include "pm-rcar.h"
  30 #include "r8a7779.h"
  31
  32 #define AVECR IOMEM(0xfe700040)
  33 #define R8A7779_SCU_BASE 0xf0000000
  34
  35 static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
  36         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  37         .chan_bit = 1, /* ARM1 */
  38         .isr_bit = 1, /* ARM1 */
  39 };
  40
  41 static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
  42         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  43         .chan_bit = 2, /* ARM2 */
  44         .isr_bit = 2, /* ARM2 */
  45 };
  46
  47 static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
  48         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  49         .chan_bit = 3, /* ARM3 */
  50         .isr_bit = 3, /* ARM3 */
  51 };
  52
  53 static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
  54         [1] = &r8a7779_ch_cpu1,
  55         [2] = &r8a7779_ch_cpu2,
  56         [3] = &r8a7779_ch_cpu3,
  57 };
  58
  59 #if defined(CONFIG_HAVE_ARM_TWD) && !defined(CONFIG_ARCH_MULTIPLATFORM)
  60 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
  61 void __init r8a7779_register_twd(void)
  62 {
  63         twd_local_timer_register(&twd_local_timer);
  64 }
  65 #endif
  66
  67 static int r8a7779_platform_cpu_kill(unsigned int cpu)
  68 {
  69         struct rcar_sysc_ch *ch = NULL;
  70         int ret = -EIO;
  71
  72         cpu = cpu_logical_map(cpu);
  73
  74         if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
  75                 ch = r8a7779_ch_cpu[cpu];
  76
  77         if (ch)
  78                 ret = rcar_sysc_power_down(ch);
  79
  80         return ret ? ret : 1;
  81 }
  82
  83 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
  84 {
  85         struct rcar_sysc_ch *ch = NULL;
  86         unsigned int lcpu = cpu_logical_map(cpu);
  87         int ret;
  88
  89         if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
  90                 ch = r8a7779_ch_cpu[lcpu];
  91
  92         if (ch)
  93                 ret = rcar_sysc_power_up(ch);
  94         else
  95                 ret = -EIO;
  96
  97         return ret;
  98 }
  99
 100 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
 101 {
 102         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
 103         __raw_writel(__pa(shmobile_boot_vector), AVECR);
 104         shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
 105         shmobile_boot_arg = (unsigned long)shmobile_scu_base;
 106
 107         /* setup r8a7779 specific SCU bits */
 108         shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
 109         shmobile_smp_scu_prepare_cpus(max_cpus);
 110
 111         r8a7779_pm_init();
 112
 113         /* power off secondary CPUs */
 114         r8a7779_platform_cpu_kill(1);
 115         r8a7779_platform_cpu_kill(2);
 116         r8a7779_platform_cpu_kill(3);
 117 }
 118
 119 #ifdef CONFIG_HOTPLUG_CPU
 120 static int r8a7779_cpu_kill(unsigned int cpu)
 121 {
 122         if (shmobile_smp_scu_cpu_kill(cpu))
 123                 return r8a7779_platform_cpu_kill(cpu);
 124
 125         return 0;
 126 }
 127 #endif /* CONFIG_HOTPLUG_CPU */
 128
 129 struct smp_operations r8a7779_smp_ops  __initdata = {
 130         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
 131         .smp_boot_secondary     = r8a7779_boot_secondary,
 132 #ifdef CONFIG_HOTPLUG_CPU
 133         .cpu_die                = shmobile_smp_scu_cpu_die,
 134         .cpu_kill               = r8a7779_cpu_kill,
 135 #endif
 136 };