arch/arm/mach-shmobile/platsmp.c

   1 /*
   2  * SMP support for R-Mobile / SH-Mobile
   3  *
   4  * Copyright (C) 2010  Magnus Damm
   5  * Copyright (C) 2011  Paul Mundt
   6  *
   7  * Based on vexpress, Copyright (C) 2002 ARM Ltd, All Rights Reserved
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/errno.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/smp.h>
  18 #include <linux/io.h>
  19 #include <asm/hardware/gic.h>
  20 #include <asm/localtimer.h>
  21 #include <asm/mach-types.h>
  22 #include <mach/common.h>
  23
  24 static unsigned int __init shmobile_smp_get_core_count(void)
  25 {
  26         if (machine_is_ag5evm())
  27                 return sh73a0_get_core_count();
  28
  29         return 1;
  30 }
  31
  32 static void __init shmobile_smp_prepare_cpus(void)
  33 {
  34         if (machine_is_ag5evm())
  35                 sh73a0_smp_prepare_cpus();
  36 }
  37
  38 void __cpuinit platform_secondary_init(unsigned int cpu)
  39 {
  40         trace_hardirqs_off();
  41
  42         if (machine_is_ag5evm())
  43                 sh73a0_secondary_init(cpu);
  44 }
  45
  46 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
  47 {
  48         if (machine_is_ag5evm())
  49                 return sh73a0_boot_secondary(cpu);
  50
  51         return -ENOSYS;
  52 }
  53
  54 void __init smp_init_cpus(void)
  55 {
  56         unsigned int ncores = shmobile_smp_get_core_count();
  57         unsigned int i;
  58
  59         for (i = 0; i < ncores; i++)
  60                 set_cpu_possible(i, true);
  61
  62         set_smp_cross_call(gic_raise_softirq);
  63 }
  64
  65 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
  66 {
  67         int i;
  68
  69         for (i = 0; i < max_cpus; i++)
  70                 set_cpu_present(i, true);
  71
  72         shmobile_smp_prepare_cpus();
  73 }