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 <linux/atomic.h>
  28 #include <asm/cpu.h>
  29 #include <asm/processor.h>
  30 #include <asm/smtc.h>
  31 #include <asm/system.h>
  32 #include <asm/mmu_context.h>
  33 #include <asm/smtc_ipi.h>
  34
  35 /* VPE/SMP Prototype implements platform interfaces directly */
  36
  37 /*
  38  * Cause the specified action to be performed on a targeted "CPU"
  39  */
  40
  41 static void ssmtc_send_ipi_single(int cpu, unsigned int action)
  42 {
  43         smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
  44         /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
  45 }
  46
  47 static inline void ssmtc_send_ipi_mask(const struct cpumask *mask,
  48                                        unsigned int action)
  49 {
  50         unsigned int i;
  51
  52         for_each_cpu(i, mask)
  53                 ssmtc_send_ipi_single(i, action);
  54 }
  55
  56 /*
  57  * Post-config but pre-boot cleanup entry point
  58  */
  59 static void __cpuinit ssmtc_init_secondary(void)
  60 {
  61         smtc_init_secondary();
  62 }
  63
  64 /*
  65  * SMP initialization finalization entry point
  66  */
  67 static void __cpuinit ssmtc_smp_finish(void)
  68 {
  69         smtc_smp_finish();
  70 }
  71
  72 /*
  73  * Hook for after all CPUs are online
  74  */
  75 static void ssmtc_cpus_done(void)
  76 {
  77 }
  78
  79 /*
  80  * Platform "CPU" startup hook
  81  */
  82 static void __cpuinit ssmtc_boot_secondary(int cpu, struct task_struct *idle)
  83 {
  84         smtc_boot_secondary(cpu, idle);
  85 }
  86
  87 static void __init ssmtc_smp_setup(void)
  88 {
  89         if (read_c0_config3() & (1 << 2))
  90                 mipsmt_build_cpu_map(0);
  91 }
  92
  93 /*
  94  * Platform SMP pre-initialization
  95  */
  96 static void ssmtc_prepare_cpus(unsigned int max_cpus)
  97 {
  98         /*
  99          * As noted above, we can assume a single CPU for now
 100          * but it may be multithreaded.
 101          */
 102
 103         if (read_c0_config3() & (1 << 2)) {
 104                 mipsmt_prepare_cpus();
 105         }
 106 }
 107
 108 struct plat_smp_ops ssmtc_smp_ops = {
 109         .send_ipi_single        = ssmtc_send_ipi_single,
 110         .send_ipi_mask          = ssmtc_send_ipi_mask,
 111         .init_secondary         = ssmtc_init_secondary,
 112         .smp_finish             = ssmtc_smp_finish,
 113         .cpus_done              = ssmtc_cpus_done,
 114         .boot_secondary         = ssmtc_boot_secondary,
 115         .smp_setup              = ssmtc_smp_setup,
 116         .prepare_cpus           = ssmtc_prepare_cpus,
 117 };