arch/arm/mach-shmobile/smp-sh73a0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SMP support for R-Mobile / SH-Mobile - sh73a0 portion
   4  *
   5  * Copyright (C) 2010  Magnus Damm
   6  * Copyright (C) 2010  Takashi Yoshii
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/smp.h>
  11 #include <linux/io.h>
  12 #include <linux/delay.h>
  13
  14 #include <asm/smp_plat.h>
  15
  16 #include "common.h"
  17 #include "sh73a0.h"
  18
  19 #define WUPCR           IOMEM(0xe6151010)
  20 #define SRESCR          IOMEM(0xe6151018)
  21 #define PSTR            IOMEM(0xe6151040)
  22 #define SBAR            IOMEM(0xe6180020)
  23 #define APARMBAREA      IOMEM(0xe6f10020)
  24
  25 #define SH73A0_SCU_BASE 0xf0000000
  26
  27 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
  28 {
  29         unsigned int lcpu = cpu_logical_map(cpu);
  30
  31         if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
  32                 __raw_writel(1 << lcpu, WUPCR); /* wake up */
  33         else
  34                 __raw_writel(1 << lcpu, SRESCR);        /* reset */
  35
  36         return 0;
  37 }
  38
  39 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
  40 {
  41         /* Map the reset vector (in headsmp.S) */
  42         __raw_writel(0, APARMBAREA);      /* 4k */
  43         __raw_writel(__pa(shmobile_boot_vector), SBAR);
  44
  45         /* setup sh73a0 specific SCU bits */
  46         shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
  47 }
  48
  49 const struct smp_operations sh73a0_smp_ops __initconst = {
  50         .smp_prepare_cpus       = sh73a0_smp_prepare_cpus,
  51         .smp_boot_secondary     = sh73a0_boot_secondary,
  52 #ifdef CONFIG_HOTPLUG_CPU
  53         .cpu_can_disable        = shmobile_smp_cpu_can_disable,
  54         .cpu_die                = shmobile_smp_scu_cpu_die,
  55         .cpu_kill               = shmobile_smp_scu_cpu_kill,
  56 #endif
  57 };