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 #ifdef CONFIG_ARCH_SH73A0
  26 #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2() || \
  27                         of_machine_is_compatible("renesas,sh73a0"))
  28 #else
  29 #define is_sh73a0() (0)
  30 #endif
  31
  32 #define is_r8a7779() machine_is_marzen()
  33
  34 #ifdef CONFIG_ARCH_EMEV2
  35 #define is_emev2() of_machine_is_compatible("renesas,emev2")
  36 #else
  37 #define is_emev2() (0)
  38 #endif
  39
  40 static unsigned int __init shmobile_smp_get_core_count(void)
  41 {
  42         if (is_sh73a0())
  43                 return sh73a0_get_core_count();
  44
  45         if (is_r8a7779())
  46                 return r8a7779_get_core_count();
  47
  48         if (is_emev2())
  49                 return emev2_get_core_count();
  50
  51         return 1;
  52 }
  53
  54 static void __init shmobile_smp_prepare_cpus(void)
  55 {
  56         if (is_sh73a0())
  57                 sh73a0_smp_prepare_cpus();
  58
  59         if (is_r8a7779())
  60                 r8a7779_smp_prepare_cpus();
  61
  62         if (is_emev2())
  63                 emev2_smp_prepare_cpus();
  64 }
  65
  66 int shmobile_platform_cpu_kill(unsigned int cpu)
  67 {
  68         if (is_r8a7779())
  69                 return r8a7779_platform_cpu_kill(cpu);
  70
  71         if (is_emev2())
  72                 return emev2_platform_cpu_kill(cpu);
  73
  74         return 1;
  75 }
  76
  77 void __cpuinit platform_secondary_init(unsigned int cpu)
  78 {
  79         trace_hardirqs_off();
  80
  81         if (is_sh73a0())
  82                 sh73a0_secondary_init(cpu);
  83
  84         if (is_r8a7779())
  85                 r8a7779_secondary_init(cpu);
  86
  87         if (is_emev2())
  88                 emev2_secondary_init(cpu);
  89 }
  90
  91 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
  92 {
  93         if (is_sh73a0())
  94                 return sh73a0_boot_secondary(cpu);
  95
  96         if (is_r8a7779())
  97                 return r8a7779_boot_secondary(cpu);
  98
  99         if (is_emev2())
 100                 return emev2_boot_secondary(cpu);
 101
 102         return -ENOSYS;
 103 }
 104
 105 void __init smp_init_cpus(void)
 106 {
 107         unsigned int ncores = shmobile_smp_get_core_count();
 108         unsigned int i;
 109
 110         if (ncores > nr_cpu_ids) {
 111                 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
 112                         ncores, nr_cpu_ids);
 113                 ncores = nr_cpu_ids;
 114         }
 115
 116         for (i = 0; i < ncores; i++)
 117                 set_cpu_possible(i, true);
 118
 119         set_smp_cross_call(gic_raise_softirq);
 120 }
 121
 122 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 123 {
 124         shmobile_smp_prepare_cpus();
 125 }