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 #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2())
  25
  26 static unsigned int __init shmobile_smp_get_core_count(void)
  27 {
  28         if (is_sh73a0())
  29                 return sh73a0_get_core_count();
  30
  31         return 1;
  32 }
  33
  34 static void __init shmobile_smp_prepare_cpus(void)
  35 {
  36         if (is_sh73a0())
  37                 sh73a0_smp_prepare_cpus();
  38 }
  39
  40 void __cpuinit platform_secondary_init(unsigned int cpu)
  41 {
  42         trace_hardirqs_off();
  43
  44         if (is_sh73a0())
  45                 sh73a0_secondary_init(cpu);
  46 }
  47
  48 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
  49 {
  50         if (is_sh73a0())
  51                 return sh73a0_boot_secondary(cpu);
  52
  53         return -ENOSYS;
  54 }
  55
  56 void __init smp_init_cpus(void)
  57 {
  58         unsigned int ncores = shmobile_smp_get_core_count();
  59         unsigned int i;
  60
  61         if (ncores > nr_cpu_ids) {
  62                 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
  63                         ncores, nr_cpu_ids);
  64                 ncores = nr_cpu_ids;
  65         }
  66
  67         for (i = 0; i < ncores; i++)
  68                 set_cpu_possible(i, true);
  69
  70         set_smp_cross_call(gic_raise_softirq);
  71 }
  72
  73 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
  74 {
  75         shmobile_smp_prepare_cpus();
  76 }