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
  33 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
  34 {
  35         arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
  36         return 0;
  37 }
  38
  39 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
  40 {
  41         scu_enable(shmobile_scu_base);
  42
  43         /* Tell ROM loader about our vector (in headsmp-scu.S, headsmp.S) */
  44         emev2_set_boot_vector(__pa(shmobile_boot_vector));
  45         shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
  46         shmobile_boot_arg = (unsigned long)shmobile_scu_base;
  47
  48         /* enable cache coherency on booting CPU */
  49         scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
  50 }
  51
  52 static void __init emev2_smp_init_cpus(void)
  53 {
  54         unsigned int ncores;
  55
  56         /* setup EMEV2 specific SCU base */
  57         shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
  58         emev2_clock_init(); /* need ioremapped SMU */
  59
  60         ncores = shmobile_scu_base ? scu_get_core_count(shmobile_scu_base) : 1;
  61
  62         shmobile_smp_init_cpus(ncores);
  63 }
  64
  65 struct smp_operations emev2_smp_ops __initdata = {
  66         .smp_init_cpus          = emev2_smp_init_cpus,
  67         .smp_prepare_cpus       = emev2_smp_prepare_cpus,
  68         .smp_boot_secondary     = emev2_boot_secondary,
  69 };