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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/smp.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/io.h>
  25 #include <linux/delay.h>
  26 #include <mach/common.h>
  27 #include <mach/emev2.h>
  28 #include <asm/smp_plat.h>
  29 #include <asm/smp_scu.h>
  30
  31 #define EMEV2_SCU_BASE 0x1e000000
  32 #define EMEV2_SMU_BASE 0xe0110000
  33 #define SMU_GENERAL_REG0 0x7c0
  34
  35 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
  36 {
  37         int ret;
  38
  39         ret = shmobile_smp_scu_boot_secondary(cpu, idle);
  40         if (ret)
  41                 return ret;
  42
  43         arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
  44         return 0;
  45 }
  46
  47 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
  48 {
  49         void __iomem *smu;
  50
  51         /* Tell ROM loader about our vector (in headsmp.S) */
  52         smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE);
  53         if (smu) {
  54                 iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0);
  55                 iounmap(smu);
  56         }
  57
  58         /* setup EMEV2 specific SCU bits */
  59         shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
  60         shmobile_smp_scu_prepare_cpus(max_cpus);
  61 }
  62
  63 struct smp_operations emev2_smp_ops __initdata = {
  64         .smp_prepare_cpus       = emev2_smp_prepare_cpus,
  65         .smp_boot_secondary     = emev2_boot_secondary,
  66 };