arch/mips/kernel/smp-gic.c

   1 /*
   2  * Copyright (C) 2013 Imagination Technologies
   3  * Author: Paul Burton <paul.burton@imgtec.com>
   4  *
   5  * Based on smp-cmp.c:
   6  *  Copyright (C) 2007 MIPS Technologies, Inc.
   7  *  Author: Chris Dearman (chris@mips.com)
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/irqchip/mips-gic.h>
  16 #include <linux/printk.h>
  17
  18 #include <asm/mips-cpc.h>
  19 #include <asm/smp-ops.h>
  20
  21 void gic_send_ipi_single(int cpu, unsigned int action)
  22 {
  23         unsigned long flags;
  24         unsigned int intr;
  25         unsigned int core = cpu_data[cpu].core;
  26
  27         pr_debug("CPU%d: %s cpu %d action %u status %08x\n",
  28                  smp_processor_id(), __func__, cpu, action, read_c0_status());
  29
  30         local_irq_save(flags);
  31
  32         switch (action) {
  33         case SMP_CALL_FUNCTION:
  34                 intr = plat_ipi_call_int_xlate(cpu);
  35                 break;
  36
  37         case SMP_RESCHEDULE_YOURSELF:
  38                 intr = plat_ipi_resched_int_xlate(cpu);
  39                 break;
  40
  41         default:
  42                 BUG();
  43         }
  44
  45         gic_send_ipi(intr);
  46
  47         if (mips_cpc_present() && (core != current_cpu_data.core)) {
  48                 while (!cpumask_test_cpu(cpu, &cpu_coherent_mask)) {
  49                         mips_cm_lock_other(core, 0);
  50                         mips_cpc_lock_other(core);
  51                         write_cpc_co_cmd(CPC_Cx_CMD_PWRUP);
  52                         mips_cpc_unlock_other();
  53                         mips_cm_unlock_other();
  54                 }
  55         }
  56
  57         local_irq_restore(flags);
  58 }
  59
  60 void gic_send_ipi_mask(const struct cpumask *mask, unsigned int action)
  61 {
  62         unsigned int i;
  63
  64         for_each_cpu(i, mask)
  65                 gic_send_ipi_single(i, action);
  66 }