release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/mipssim/sim_smtc.c

   1 /*
   2  * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
   3  *
   4  *  This program is free software; you can distribute it and/or modify it
   5  *  under the terms of the GNU General Public License (Version 2) as
   6  *  published by the Free Software Foundation.
   7  *
   8  *  This program is distributed in the hope it will be useful, but WITHOUT
   9  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  *  for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License along
  14  *  with this program; if not, write to the Free Software Foundation, Inc.,
  15  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  *
  17  */
  18 /*
  19  * Simulator Platform-specific hooks for SMTC operation
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/cpumask.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/smp.h>
  26
  27 #include <asm/atomic.h>
  28 #include <asm/cpu.h>
  29 #include <asm/processor.h>
  30 #include <asm/system.h>
  31 #include <asm/mmu_context.h>
  32 #include <asm/smtc_ipi.h>
  33
  34 /* VPE/SMP Prototype implements platform interfaces directly */
  35
  36 /*
  37  * Cause the specified action to be performed on a targeted "CPU"
  38  */
  39
  40 static void ssmtc_send_ipi_single(int cpu, unsigned int action)
  41 {
  42         smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
  43         /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
  44 }
  45
  46 static inline void ssmtc_send_ipi_mask(const struct cpumask *mask,
  47                                        unsigned int action)
  48 {
  49         unsigned int i;
  50
  51         for_each_cpu(i, mask)
  52                 ssmtc_send_ipi_single(i, action);
  53 }
  54
  55 /*
  56  * Post-config but pre-boot cleanup entry point
  57  */
  58 static void __cpuinit ssmtc_init_secondary(void)
  59 {
  60         void smtc_init_secondary(void);
  61
  62         smtc_init_secondary();
  63 }
  64
  65 /*
  66  * SMP initialization finalization entry point
  67  */
  68 static void __cpuinit ssmtc_smp_finish(void)
  69 {
  70         smtc_smp_finish();
  71 }
  72
  73 /*
  74  * Hook for after all CPUs are online
  75  */
  76 static void ssmtc_cpus_done(void)
  77 {
  78 }
  79
  80 /*
  81  * Platform "CPU" startup hook
  82  */
  83 static void __cpuinit ssmtc_boot_secondary(int cpu, struct task_struct *idle)
  84 {
  85         smtc_boot_secondary(cpu, idle);
  86 }
  87
  88 static void __init ssmtc_smp_setup(void)
  89 {
  90         if (read_c0_config3() & (1 << 2))
  91                 mipsmt_build_cpu_map(0);
  92 }
  93
  94 /*
  95  * Platform SMP pre-initialization
  96  */
  97 static void ssmtc_prepare_cpus(unsigned int max_cpus)
  98 {
  99         /*
 100          * As noted above, we can assume a single CPU for now
 101          * but it may be multithreaded.
 102          */
 103
 104         if (read_c0_config3() & (1 << 2)) {
 105                 mipsmt_prepare_cpus();
 106         }
 107 }
 108
 109 struct plat_smp_ops ssmtc_smp_ops = {
 110         .send_ipi_single        = ssmtc_send_ipi_single,
 111         .send_ipi_mask          = ssmtc_send_ipi_mask,
 112         .init_secondary         = ssmtc_init_secondary,
 113         .smp_finish             = ssmtc_smp_finish,
 114         .cpus_done              = ssmtc_cpus_done,
 115         .boot_secondary         = ssmtc_boot_secondary,
 116         .smp_setup              = ssmtc_smp_setup,
 117         .prepare_cpus           = ssmtc_prepare_cpus,
 118 };