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 #define is_r8a7779() machine_is_marzen()
  26
  27 static unsigned int __init shmobile_smp_get_core_count(void)
  28 {
  29         if (is_sh73a0())
  30                 return sh73a0_get_core_count();
  31
  32         if (is_r8a7779())
  33                 return r8a7779_get_core_count();
  34
  35         return 1;
  36 }
  37
  38 static void __init shmobile_smp_prepare_cpus(void)
  39 {
  40         if (is_sh73a0())
  41                 sh73a0_smp_prepare_cpus();
  42
  43         if (is_r8a7779())
  44                 r8a7779_smp_prepare_cpus();
  45 }
  46
  47 int shmobile_platform_cpu_kill(unsigned int cpu)
  48 {
  49         if (is_r8a7779())
  50                 return r8a7779_platform_cpu_kill(cpu);
  51
  52         return 1;
  53 }
  54
  55 void __cpuinit platform_secondary_init(unsigned int cpu)
  56 {
  57         trace_hardirqs_off();
  58
  59         if (is_sh73a0())
  60                 sh73a0_secondary_init(cpu);
  61
  62         if (is_r8a7779())
  63                 r8a7779_secondary_init(cpu);
  64 }
  65
  66 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
  67 {
  68         if (is_sh73a0())
  69                 return sh73a0_boot_secondary(cpu);
  70
  71         if (is_r8a7779())
  72                 return r8a7779_boot_secondary(cpu);
  73
  74         return -ENOSYS;
  75 }
  76
  77 void __init smp_init_cpus(void)
  78 {
  79         unsigned int ncores = shmobile_smp_get_core_count();
  80         unsigned int i;
  81
  82         if (ncores > nr_cpu_ids) {
  83                 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
  84                         ncores, nr_cpu_ids);
  85                 ncores = nr_cpu_ids;
  86         }
  87
  88         for (i = 0; i < ncores; i++)
  89                 set_cpu_possible(i, true);
  90
  91         set_smp_cross_call(gic_raise_softirq);
  92 }
  93
  94 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
  95 {
  96         shmobile_smp_prepare_cpus();
  97 }