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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/smp.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/io.h>
  25 #include <linux/delay.h>
  26 #include <mach/common.h>
  27 #include <mach/pm-rcar.h>
  28 #include <mach/r8a7779.h>
  29 #include <asm/cacheflush.h>
  30 #include <asm/smp_plat.h>
  31 #include <asm/smp_scu.h>
  32 #include <asm/smp_twd.h>
  33
  34 #define AVECR IOMEM(0xfe700040)
  35 #define R8A7779_SCU_BASE 0xf0000000
  36
  37 static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
  38         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  39         .chan_bit = 1, /* ARM1 */
  40         .isr_bit = 1, /* ARM1 */
  41 };
  42
  43 static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
  44         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  45         .chan_bit = 2, /* ARM2 */
  46         .isr_bit = 2, /* ARM2 */
  47 };
  48
  49 static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
  50         .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
  51         .chan_bit = 3, /* ARM3 */
  52         .isr_bit = 3, /* ARM3 */
  53 };
  54
  55 static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
  56         [1] = &r8a7779_ch_cpu1,
  57         [2] = &r8a7779_ch_cpu2,
  58         [3] = &r8a7779_ch_cpu3,
  59 };
  60
  61 #ifdef CONFIG_HAVE_ARM_TWD
  62 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
  63 void __init r8a7779_register_twd(void)
  64 {
  65         twd_local_timer_register(&twd_local_timer);
  66 }
  67 #endif
  68
  69 static int r8a7779_platform_cpu_kill(unsigned int cpu)
  70 {
  71         struct rcar_sysc_ch *ch = NULL;
  72         int ret = -EIO;
  73
  74         cpu = cpu_logical_map(cpu);
  75
  76         if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
  77                 ch = r8a7779_ch_cpu[cpu];
  78
  79         if (ch)
  80                 ret = rcar_sysc_power_down(ch);
  81
  82         return ret ? ret : 1;
  83 }
  84
  85 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
  86 {
  87         struct rcar_sysc_ch *ch = NULL;
  88         unsigned int lcpu = cpu_logical_map(cpu);
  89         int ret;
  90
  91         if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
  92                 ch = r8a7779_ch_cpu[lcpu];
  93
  94         if (ch)
  95                 ret = rcar_sysc_power_up(ch);
  96         else
  97                 ret = -EIO;
  98
  99         return ret;
 100 }
 101
 102 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
 103 {
 104         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
 105         __raw_writel(__pa(shmobile_boot_vector), AVECR);
 106         shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
 107         shmobile_boot_arg = (unsigned long)shmobile_scu_base;
 108
 109         /* setup r8a7779 specific SCU bits */
 110         shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
 111         shmobile_smp_scu_prepare_cpus(max_cpus);
 112
 113         r8a7779_pm_init();
 114
 115         /* power off secondary CPUs */
 116         r8a7779_platform_cpu_kill(1);
 117         r8a7779_platform_cpu_kill(2);
 118         r8a7779_platform_cpu_kill(3);
 119 }
 120
 121 #ifdef CONFIG_HOTPLUG_CPU
 122 static int r8a7779_cpu_kill(unsigned int cpu)
 123 {
 124         if (shmobile_smp_scu_cpu_kill(cpu))
 125                 return r8a7779_platform_cpu_kill(cpu);
 126
 127         return 0;
 128 }
 129
 130 static int r8a7779_cpu_disable(unsigned int cpu)
 131 {
 132         /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
 133         return cpu == 0 ? -EPERM : 0;
 134 }
 135 #endif /* CONFIG_HOTPLUG_CPU */
 136
 137 struct smp_operations r8a7779_smp_ops  __initdata = {
 138         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
 139         .smp_boot_secondary     = r8a7779_boot_secondary,
 140 #ifdef CONFIG_HOTPLUG_CPU
 141         .cpu_disable            = r8a7779_cpu_disable,
 142         .cpu_die                = shmobile_smp_scu_cpu_die,
 143         .cpu_kill               = r8a7779_cpu_kill,
 144 #endif
 145 };