LXR linux/arch/mips/pmcs-msp71xx/msp

   1/*
   2 * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
   3 * Copyright (C) 2001 Ralf Baechle
   4 * Copyright (C) 2010 PMC-Sierra, Inc.
   5 *
   6 *  VSMP support for MSP platforms . Derived from malta vsmp support.
   7 *
   8 *  This program is free software; you can distribute it and/or modify it
   9 *  under the terms of the GNU General Public License (Version 2) as
  10 *  published by the Free Software Foundation.
  11 *
  12 *  This program is distributed in the hope it will be useful, but WITHOUT
  13 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 *  for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License along
  18 *  with this program; if not, write to the Free Software Foundation, Inc.,
  19 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  20 *
  21 */
  22#include <linux/smp.h>
  23#include <linux/interrupt.h>
  24
  25#ifdef CONFIG_MIPS_MT_SMP
  26#define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
  27#define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for call */
  28
  29
  30static void ipi_resched_dispatch(void)
  31{
  32        do_IRQ(MIPS_CPU_IPI_RESCHED_IRQ);
  33}
  34
  35static void ipi_call_dispatch(void)
  36{
  37        do_IRQ(MIPS_CPU_IPI_CALL_IRQ);
  38}
  39
  40static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
  41{
  42        return IRQ_HANDLED;
  43}
  44
  45static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
  46{
  47        smp_call_function_interrupt();
  48
  49        return IRQ_HANDLED;
  50}
  51
  52static struct irqaction irq_resched = {
  53        .handler        = ipi_resched_interrupt,
  54        .flags          = IRQF_PERCPU,
  55        .name           = "IPI_resched"
  56};
  57
  58static struct irqaction irq_call = {
  59        .handler        = ipi_call_interrupt,
  60        .flags          = IRQF_PERCPU,
  61        .name           = "IPI_call"
  62};
  63
  64void __init arch_init_ipiirq(int irq, struct irqaction *action)
  65{
  66        setup_irq(irq, action);
  67        irq_set_handler(irq, handle_percpu_irq);
  68}
  69
  70void __init msp_vsmp_int_init(void)
  71{
  72        set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
  73        set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
  74        arch_init_ipiirq(MIPS_CPU_IPI_RESCHED_IRQ, &irq_resched);
  75        arch_init_ipiirq(MIPS_CPU_IPI_CALL_IRQ, &irq_call);
  76}
  77#endif /* CONFIG_MIPS_MT_SMP */
  78