arch/mips/pmcs-msp71xx/msp_smp.c

   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 #include <asm/setup.h>
  26
  27 #ifdef CONFIG_MIPS_MT_SMP
  28 #define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
  29 #define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for call */
  30
  31
  32 static void ipi_resched_dispatch(void)
  33 {
  34         do_IRQ(MIPS_CPU_IPI_RESCHED_IRQ);
  35 }
  36
  37 static void ipi_call_dispatch(void)
  38 {
  39         do_IRQ(MIPS_CPU_IPI_CALL_IRQ);
  40 }
  41
  42 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
  43 {
  44         return IRQ_HANDLED;
  45 }
  46
  47 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
  48 {
  49         generic_smp_call_function_interrupt();
  50
  51         return IRQ_HANDLED;
  52 }
  53
  54 static struct irqaction irq_resched = {
  55         .handler        = ipi_resched_interrupt,
  56         .flags          = IRQF_PERCPU,
  57         .name           = "IPI_resched"
  58 };
  59
  60 static struct irqaction irq_call = {
  61         .handler        = ipi_call_interrupt,
  62         .flags          = IRQF_PERCPU,
  63         .name           = "IPI_call"
  64 };
  65
  66 void __init arch_init_ipiirq(int irq, struct irqaction *action)
  67 {
  68         setup_irq(irq, action);
  69         irq_set_handler(irq, handle_percpu_irq);
  70 }
  71
  72 void __init msp_vsmp_int_init(void)
  73 {
  74         set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
  75         set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
  76         arch_init_ipiirq(MIPS_CPU_IPI_RESCHED_IRQ, &irq_resched);
  77         arch_init_ipiirq(MIPS_CPU_IPI_CALL_IRQ, &irq_call);
  78 }
  79 #endif /* CONFIG_MIPS_MT_SMP */