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 <linux/of.h>
  20 #include <asm/hardware/gic.h>
  21 #include <asm/mach-types.h>
  22 #include <mach/common.h>
  23 #include <mach/emev2.h>
  24
  25 #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2() || \
  26                         of_machine_is_compatible("renesas,sh73a0"))
  27 #define is_r8a7779() machine_is_marzen()
  28 #define is_emev2() of_machine_is_compatible("renesas,emev2")
  29
  30 static unsigned int __init shmobile_smp_get_core_count(void)
  31 {
  32         if (is_sh73a0())
  33                 return sh73a0_get_core_count();
  34
  35         if (is_r8a7779())
  36                 return r8a7779_get_core_count();
  37
  38         if (is_emev2())
  39                 return emev2_get_core_count();
  40
  41         return 1;
  42 }
  43
  44 static void __init shmobile_smp_prepare_cpus(void)
  45 {
  46         if (is_sh73a0())
  47                 sh73a0_smp_prepare_cpus();
  48
  49         if (is_r8a7779())
  50                 r8a7779_smp_prepare_cpus();
  51
  52         if (is_emev2())
  53                 emev2_smp_prepare_cpus();
  54 }
  55
  56 int shmobile_platform_cpu_kill(unsigned int cpu)
  57 {
  58         if (is_r8a7779())
  59                 return r8a7779_platform_cpu_kill(cpu);
  60
  61         if (is_emev2())
  62                 return emev2_platform_cpu_kill(cpu);
  63
  64         return 1;
  65 }
  66
  67 void __cpuinit platform_secondary_init(unsigned int cpu)
  68 {
  69         trace_hardirqs_off();
  70
  71         if (is_sh73a0())
  72                 sh73a0_secondary_init(cpu);
  73
  74         if (is_r8a7779())
  75                 r8a7779_secondary_init(cpu);
  76
  77         if (is_emev2())
  78                 emev2_secondary_init(cpu);
  79 }
  80
  81 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
  82 {
  83         if (is_sh73a0())
  84                 return sh73a0_boot_secondary(cpu);
  85
  86         if (is_r8a7779())
  87                 return r8a7779_boot_secondary(cpu);
  88
  89         if (is_emev2())
  90                 return emev2_boot_secondary(cpu);
  91
  92         return -ENOSYS;
  93 }
  94
  95 void __init smp_init_cpus(void)
  96 {
  97         unsigned int ncores = shmobile_smp_get_core_count();
  98         unsigned int i;
  99
 100         if (ncores > nr_cpu_ids) {
 101                 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
 102                         ncores, nr_cpu_ids);
 103                 ncores = nr_cpu_ids;
 104         }
 105
 106         for (i = 0; i < ncores; i++)
 107                 set_cpu_possible(i, true);
 108
 109         set_smp_cross_call(gic_raise_softirq);
 110 }
 111
 112 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 113 {
 114         shmobile_smp_prepare_cpus();
 115 }