LXR linux/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 CPG_BASE2       0xe6151000
  20#define WUPCR           0x10    /* System-CPU Wake Up Control Register */
  21#define SRESCR          0x18    /* System-CPU Software Reset Control Register */
  22#define PSTR            0x40    /* System-CPU Power Status Register */
  23
  24#define SYSC_BASE       0xe6180000
  25#define SBAR            0x20    /* SYS Boot Address Register */
  26
  27#define AP_BASE         0xe6f10000
  28#define APARMBAREA      0x20    /* Address Translation Area Register */
  29
  30#define SH73A0_SCU_BASE 0xf0000000
  31
  32static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
  33{
  34        unsigned int lcpu = cpu_logical_map(cpu);
  35        void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE);
  36
  37        if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3)
  38                writel(1 << lcpu, cpg2 + WUPCR);        /* wake up */
  39        else
  40                writel(1 << lcpu, cpg2 + SRESCR);       /* reset */
  41        iounmap(cpg2);
  42        return 0;
  43}
  44
  45static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
  46{
  47        void __iomem *ap = ioremap(AP_BASE, PAGE_SIZE);
  48        void __iomem *sysc = ioremap(SYSC_BASE, PAGE_SIZE);
  49
  50        /* Map the reset vector (in headsmp.S) */
  51        writel(0, ap + APARMBAREA);      /* 4k */
  52        writel(__pa(shmobile_boot_vector), sysc + SBAR);
  53        iounmap(sysc);
  54        iounmap(ap);
  55
  56        /* setup sh73a0 specific SCU bits */
  57        shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
  58}
  59
  60const struct smp_operations sh73a0_smp_ops __initconst = {
  61        .smp_prepare_cpus       = sh73a0_smp_prepare_cpus,
  62        .smp_boot_secondary     = sh73a0_boot_secondary,
  63#ifdef CONFIG_HOTPLUG_CPU
  64        .cpu_can_disable        = shmobile_smp_cpu_can_disable,
  65        .cpu_die                = shmobile_smp_scu_cpu_die,
  66        .cpu_kill               = shmobile_smp_scu_cpu_kill,
  67#endif
  68};
  69