LXR linux/arch/arm/mach-shmobile/smp-emev2.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SMP support for Emma Mobile EV2
   4 *
   5 * Copyright (C) 2012  Renesas Solutions Corp.
   6 * Copyright (C) 2012  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 <asm/smp_plat.h>
  15#include <asm/smp_scu.h>
  16
  17#include "common.h"
  18#include "emev2.h"
  19
  20#define EMEV2_SCU_BASE 0x1e000000
  21#define EMEV2_SMU_BASE 0xe0110000
  22#define SMU_GENERAL_REG0 0x7c0
  23
  24static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
  25{
  26        arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
  27        return 0;
  28}
  29
  30static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
  31{
  32        void __iomem *smu;
  33
  34        /* Tell ROM loader about our vector (in headsmp.S) */
  35        smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE);
  36        if (smu) {
  37                iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0);
  38                iounmap(smu);
  39        }
  40
  41        /* setup EMEV2 specific SCU bits */
  42        shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus);
  43}
  44
  45const struct smp_operations emev2_smp_ops __initconst = {
  46        .smp_prepare_cpus       = emev2_smp_prepare_cpus,
  47        .smp_boot_secondary     = emev2_boot_secondary,
  48};
  49