arch/mips/netlogic/common/smp.c

   1 /*
   2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3  * reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the NetLogic
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/delay.h>
  37 #include <linux/init.h>
  38 #include <linux/smp.h>
  39 #include <linux/irq.h>
  40
  41 #include <asm/mmu_context.h>
  42
  43 #include <asm/netlogic/interrupt.h>
  44 #include <asm/netlogic/mips-extns.h>
  45 #include <asm/netlogic/haldefs.h>
  46 #include <asm/netlogic/common.h>
  47
  48 #include <asm/netlogic/xlr/iomap.h>
  49 #include <asm/netlogic/xlr/pic.h>
  50
  51 void nlm_send_ipi_single(int logical_cpu, unsigned int action)
  52 {
  53         int cpu = cpu_logical_map(logical_cpu);
  54
  55         if (action & SMP_CALL_FUNCTION)
  56                 nlm_pic_send_ipi(nlm_pic_base, cpu, IRQ_IPI_SMP_FUNCTION, 0);
  57         if (action & SMP_RESCHEDULE_YOURSELF)
  58                 nlm_pic_send_ipi(nlm_pic_base, cpu, IRQ_IPI_SMP_RESCHEDULE, 0);
  59 }
  60
  61 void nlm_send_ipi_mask(const struct cpumask *mask, unsigned int action)
  62 {
  63         int cpu;
  64
  65         for_each_cpu(cpu, mask) {
  66                 nlm_send_ipi_single(cpu, action);
  67         }
  68 }
  69
  70 /* IRQ_IPI_SMP_FUNCTION Handler */
  71 void nlm_smp_function_ipi_handler(unsigned int irq, struct irq_desc *desc)
  72 {
  73         smp_call_function_interrupt();
  74         write_c0_eirr(1ull << irq);
  75 }
  76
  77 /* IRQ_IPI_SMP_RESCHEDULE  handler */
  78 void nlm_smp_resched_ipi_handler(unsigned int irq, struct irq_desc *desc)
  79 {
  80         scheduler_ipi();
  81         write_c0_eirr(1ull << irq);
  82 }
  83
  84 /*
  85  * Called before going into mips code, early cpu init
  86  */
  87 void nlm_early_init_secondary(int cpu)
  88 {
  89         write_c0_ebase((uint32_t)nlm_common_ebase);
  90 #ifdef NLM_XLP
  91         if (cpu % 4 == 0)
  92                 xlp_mmu_init();
  93 #endif
  94 }
  95
  96 /*
  97  * Code to run on secondary just after probing the CPU
  98  */
  99 static void __cpuinit nlm_init_secondary(void)
 100 {
 101         nlm_smp_irq_init();
 102 }
 103
 104 void nlm_smp_finish(void)
 105 {
 106 #ifdef notyet
 107         nlm_common_msgring_cpu_init();
 108 #endif
 109         local_irq_enable();
 110 }
 111
 112 void nlm_cpus_done(void)
 113 {
 114 }
 115
 116 /*
 117  * Boot all other cpus in the system, initialize them, and bring them into
 118  * the boot function
 119  */
 120 int nlm_cpu_unblock[NR_CPUS];
 121 int nlm_cpu_ready[NR_CPUS];
 122 unsigned long nlm_next_gp;
 123 unsigned long nlm_next_sp;
 124 cpumask_t phys_cpu_present_map;
 125
 126 void nlm_boot_secondary(int logical_cpu, struct task_struct *idle)
 127 {
 128         unsigned long gp = (unsigned long)task_thread_info(idle);
 129         unsigned long sp = (unsigned long)__KSTK_TOS(idle);
 130         int cpu = cpu_logical_map(logical_cpu);
 131
 132         nlm_next_sp = sp;
 133         nlm_next_gp = gp;
 134
 135         /* barrier */
 136         __sync();
 137         nlm_cpu_unblock[cpu] = 1;
 138 }
 139
 140 void __init nlm_smp_setup(void)
 141 {
 142         unsigned int boot_cpu;
 143         int num_cpus, i;
 144
 145         boot_cpu = hard_smp_processor_id();
 146         cpus_clear(phys_cpu_present_map);
 147
 148         cpu_set(boot_cpu, phys_cpu_present_map);
 149         __cpu_number_map[boot_cpu] = 0;
 150         __cpu_logical_map[0] = boot_cpu;
 151         cpu_set(0, cpu_possible_map);
 152
 153         num_cpus = 1;
 154         for (i = 0; i < NR_CPUS; i++) {
 155                 /*
 156                  * nlm_cpu_ready array is not set for the boot_cpu,
 157                  * it is only set for ASPs (see smpboot.S)
 158                  */
 159                 if (nlm_cpu_ready[i]) {
 160                         cpu_set(i, phys_cpu_present_map);
 161                         __cpu_number_map[i] = num_cpus;
 162                         __cpu_logical_map[num_cpus] = i;
 163                         cpu_set(num_cpus, cpu_possible_map);
 164                         ++num_cpus;
 165                 }
 166         }
 167
 168         pr_info("Phys CPU present map: %lx, possible map %lx\n",
 169                 (unsigned long)phys_cpu_present_map.bits[0],
 170                 (unsigned long)cpu_possible_map.bits[0]);
 171
 172         pr_info("Detected %i Slave CPU(s)\n", num_cpus);
 173 }
 174
 175 void nlm_prepare_cpus(unsigned int max_cpus)
 176 {
 177 }
 178
 179 struct plat_smp_ops nlm_smp_ops = {
 180         .send_ipi_single        = nlm_send_ipi_single,
 181         .send_ipi_mask          = nlm_send_ipi_mask,
 182         .init_secondary         = nlm_init_secondary,
 183         .smp_finish             = nlm_smp_finish,
 184         .cpus_done              = nlm_cpus_done,
 185         .boot_secondary         = nlm_boot_secondary,
 186         .smp_setup              = nlm_smp_setup,
 187         .prepare_cpus           = nlm_prepare_cpus,
 188 };