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
  24 static 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
  30 static 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
  45 const struct smp_operations emev2_smp_ops __initconst = {
  46         .smp_prepare_cpus       = emev2_smp_prepare_cpus,
  47         .smp_boot_secondary     = emev2_boot_secondary,
  48 };