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

   1 /*
   2  * SMP support for Emma Mobile EV2
   3  *
   4  * Copyright (C) 2012  Renesas Solutions Corp.
   5  * Copyright (C) 2012  Magnus Damm
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/smp.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/io.h>
  21 #include <linux/delay.h>
  22 #include <asm/smp_plat.h>
  23 #include <asm/smp_scu.h>
  24
  25 #include "common.h"
  26 #include "emev2.h"
  27
  28 #define EMEV2_SCU_BASE 0x1e000000
  29 #define EMEV2_SMU_BASE 0xe0110000
  30 #define SMU_GENERAL_REG0 0x7c0
  31
  32 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
  33 {
  34         arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
  35         return 0;
  36 }
  37
  38 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
  39 {
  40         void __iomem *smu;
  41
  42         /* Tell ROM loader about our vector (in headsmp.S) */
  43         smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE);
  44         if (smu) {
  45                 iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0);
  46                 iounmap(smu);
  47         }
  48
  49         /* setup EMEV2 specific SCU bits */
  50         shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus);
  51 }
  52
  53 const struct smp_operations emev2_smp_ops __initconst = {
  54         .smp_prepare_cpus       = emev2_smp_prepare_cpus,
  55         .smp_boot_secondary     = emev2_boot_secondary,
  56 };