LXR linux/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
  34static 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
  40static 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
  46static 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
  52static 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
  58static 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
  74static 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
  91static 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
 108static 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
 117const 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};
 125