arch/powerpc/platforms/celleb/smp.c

   1 /*
   2  * SMP support for Celleb platform. (Incomplete)
   3  *
   4  * (C) Copyright 2006 TOSHIBA CORPORATION
   5  *
   6  * This code is based on arch/powerpc/platforms/cell/smp.c:
   7  * Dave Engebretsen, Peter Bergner, and
   8  * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
   9  * Plus various changes from other IBM teams...
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #undef DEBUG
  27
  28 #include <linux/kernel.h>
  29 #include <linux/smp.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/init.h>
  32 #include <linux/threads.h>
  33 #include <linux/cpu.h>
  34
  35 #include <asm/irq.h>
  36 #include <asm/smp.h>
  37 #include <asm/machdep.h>
  38 #include <asm/udbg.h>
  39
  40 #include "interrupt.h"
  41
  42 #ifdef DEBUG
  43 #define DBG(fmt...) udbg_printf(fmt)
  44 #else
  45 #define DBG(fmt...)
  46 #endif
  47
  48 /*
  49  * The primary thread of each non-boot processor is recorded here before
  50  * smp init.
  51  */
  52 /* static cpumask_t of_spin_map; */
  53
  54 /**
  55  * smp_startup_cpu() - start the given cpu
  56  *
  57  * At boot time, there is nothing to do for primary threads which were
  58  * started from Open Firmware.  For anything else, call RTAS with the
  59  * appropriate start location.
  60  *
  61  * Returns:
  62  *      0       - failure
  63  *      1       - success
  64  */
  65 static inline int __devinit smp_startup_cpu(unsigned int lcpu)
  66 {
  67         return 0;
  68 }
  69
  70 static void smp_beatic_message_pass(int target, int msg)
  71 {
  72         unsigned int i;
  73
  74         if (target < NR_CPUS) {
  75                 beatic_cause_IPI(target, msg);
  76         } else {
  77                 for_each_online_cpu(i) {
  78                         if (target == MSG_ALL_BUT_SELF
  79                             && i == smp_processor_id())
  80                                 continue;
  81                         beatic_cause_IPI(i, msg);
  82                 }
  83         }
  84 }
  85
  86 static int __init smp_beatic_probe(void)
  87 {
  88         return cpus_weight(cpu_possible_map);
  89 }
  90
  91 static void __devinit smp_beatic_setup_cpu(int cpu)
  92 {
  93         beatic_setup_cpu(cpu);
  94 }
  95
  96 static void __devinit smp_celleb_kick_cpu(int nr)
  97 {
  98         BUG_ON(nr < 0 || nr >= NR_CPUS);
  99
 100         if (!smp_startup_cpu(nr))
 101                 return;
 102 }
 103
 104 static int smp_celleb_cpu_bootable(unsigned int nr)
 105 {
 106         return 1;
 107 }
 108 static struct smp_ops_t bpa_beatic_smp_ops = {
 109         .message_pass   = smp_beatic_message_pass,
 110         .probe          = smp_beatic_probe,
 111         .kick_cpu       = smp_celleb_kick_cpu,
 112         .setup_cpu      = smp_beatic_setup_cpu,
 113         .cpu_bootable   = smp_celleb_cpu_bootable,
 114 };
 115
 116 /* This is called very early */
 117 void __init smp_init_celleb(void)
 118 {
 119         DBG(" -> smp_init_celleb()\n");
 120
 121         smp_ops = &bpa_beatic_smp_ops;
 122
 123         DBG(" <- smp_init_celleb()\n");
 124 }