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 <asm/smp_plat.h>
  21 #include <mach/common.h>
  22
  23 #define RST             0xe6160000
  24 #define CA15BAR         0x0020
  25 #define CA7BAR          0x0030
  26 #define CA15RESCNT      0x0040
  27 #define CA7RESCNT       0x0044
  28 #define MERAM           0xe8080000
  29
  30 static void __init r8a7790_smp_prepare_cpus(unsigned int max_cpus)
  31 {
  32         void __iomem *p;
  33         u32 bar;
  34
  35         /* let APMU code install data related to shmobile_boot_vector */
  36         shmobile_smp_apmu_prepare_cpus(max_cpus);
  37
  38         /* MERAM for jump stub, because BAR requires 256KB aligned address */
  39         p = ioremap_nocache(MERAM, shmobile_boot_size);
  40         memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
  41         iounmap(p);
  42
  43         /* setup reset vectors */
  44         p = ioremap_nocache(RST, 0x63);
  45         bar = (MERAM >> 8) & 0xfffffc00;
  46         writel_relaxed(bar, p + CA15BAR);
  47         writel_relaxed(bar, p + CA7BAR);
  48         writel_relaxed(bar | 0x10, p + CA15BAR);
  49         writel_relaxed(bar | 0x10, p + CA7BAR);
  50
  51         /* enable clocks to all CPUs */
  52         writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000,
  53                        p + CA15RESCNT);
  54         writel_relaxed((readl_relaxed(p + CA7RESCNT) & ~0x0f) | 0x5a5a0000,
  55                        p + CA7RESCNT);
  56         iounmap(p);
  57 }
  58
  59 struct smp_operations r8a7790_smp_ops __initdata = {
  60         .smp_prepare_cpus       = r8a7790_smp_prepare_cpus,
  61         .smp_boot_secondary     = shmobile_smp_apmu_boot_secondary,
  62 #ifdef CONFIG_HOTPLUG_CPU
  63         .cpu_disable            = shmobile_smp_cpu_disable,
  64         .cpu_die                = shmobile_smp_apmu_cpu_die,
  65         .cpu_kill               = shmobile_smp_apmu_cpu_kill,
  66 #endif
  67 };