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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
   4  *
   5  * Copyright (C) 2011  Renesas Solutions Corp.
   6  * Copyright (C) 2011  Magnus Damm
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/smp.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/io.h>
  13 #include <linux/delay.h>
  14 #include <linux/soc/renesas/rcar-sysc.h>
  15
  16 #include <asm/cacheflush.h>
  17 #include <asm/smp_plat.h>
  18 #include <asm/smp_scu.h>
  19
  20 #include "common.h"
  21 #include "r8a7779.h"
  22
  23 #define HPBREG_BASE             0xfe700000
  24 #define AVECR                   0x0040  /* ARM Reset Vector Address Register */
  25
  26 #define R8A7779_SCU_BASE        0xf0000000
  27
  28 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
  29 {
  30         int ret = -EIO;
  31
  32         cpu = cpu_logical_map(cpu);
  33         if (cpu)
  34                 ret = rcar_sysc_power_up_cpu(cpu);
  35
  36         return ret;
  37 }
  38
  39 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
  40 {
  41         void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
  42
  43         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
  44         writel(__pa(shmobile_boot_vector), base + AVECR);
  45
  46         /* setup r8a7779 specific SCU bits */
  47         shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
  48
  49         iounmap(base);
  50 }
  51
  52 #ifdef CONFIG_HOTPLUG_CPU
  53 static int r8a7779_platform_cpu_kill(unsigned int cpu)
  54 {
  55         int ret = -EIO;
  56
  57         cpu = cpu_logical_map(cpu);
  58         if (cpu)
  59                 ret = rcar_sysc_power_down_cpu(cpu);
  60
  61         return ret ? ret : 1;
  62 }
  63
  64 static int r8a7779_cpu_kill(unsigned int cpu)
  65 {
  66         if (shmobile_smp_scu_cpu_kill(cpu))
  67                 return r8a7779_platform_cpu_kill(cpu);
  68
  69         return 0;
  70 }
  71 #endif /* CONFIG_HOTPLUG_CPU */
  72
  73 const struct smp_operations r8a7779_smp_ops  __initconst = {
  74         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
  75         .smp_boot_secondary     = r8a7779_boot_secondary,
  76 #ifdef CONFIG_HOTPLUG_CPU
  77         .cpu_die                = shmobile_smp_scu_cpu_die,
  78         .cpu_kill               = r8a7779_cpu_kill,
  79 #endif
  80 };