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;
  42
  43         if (!request_mem_region(0, SZ_4K, "Boot Area")) {
  44                 pr_err("Failed to request boot area\n");
  45                 return;
  46         }
  47
  48         base = ioremap(HPBREG_BASE, 0x1000);
  49
  50         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
  51         writel(__pa(shmobile_boot_vector), base + AVECR);
  52
  53         /* setup r8a7779 specific SCU bits */
  54         shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
  55
  56         iounmap(base);
  57 }
  58
  59 #ifdef CONFIG_HOTPLUG_CPU
  60 static int r8a7779_platform_cpu_kill(unsigned int cpu)
  61 {
  62         int ret = -EIO;
  63
  64         cpu = cpu_logical_map(cpu);
  65         if (cpu)
  66                 ret = rcar_sysc_power_down_cpu(cpu);
  67
  68         return ret ? ret : 1;
  69 }
  70
  71 static int r8a7779_cpu_kill(unsigned int cpu)
  72 {
  73         if (shmobile_smp_scu_cpu_kill(cpu))
  74                 return r8a7779_platform_cpu_kill(cpu);
  75
  76         return 0;
  77 }
  78 #endif /* CONFIG_HOTPLUG_CPU */
  79
  80 const struct smp_operations r8a7779_smp_ops  __initconst = {
  81         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
  82         .smp_boot_secondary     = r8a7779_boot_secondary,
  83 #ifdef CONFIG_HOTPLUG_CPU
  84         .cpu_die                = shmobile_smp_scu_cpu_die,
  85         .cpu_kill               = r8a7779_cpu_kill,
  86 #endif
  87 };