arch/mips/pmc-sierra/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 #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
  30 static void ipi_resched_dispatch(void)
  31 {
  32         do_IRQ(MIPS_CPU_IPI_RESCHED_IRQ);
  33 }
  34
  35 static void ipi_call_dispatch(void)
  36 {
  37         do_IRQ(MIPS_CPU_IPI_CALL_IRQ);
  38 }
  39
  40 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
  41 {
  42         return IRQ_HANDLED;
  43 }
  44
  45 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
  46 {
  47         smp_call_function_interrupt();
  48
  49         return IRQ_HANDLED;
  50 }
  51
  52 static struct irqaction irq_resched = {
  53         .handler        = ipi_resched_interrupt,
  54         .flags          = IRQF_DISABLED | IRQF_PERCPU,
  55         .name           = "IPI_resched"
  56 };
  57
  58 static struct irqaction irq_call = {
  59         .handler        = ipi_call_interrupt,
  60         .flags          = IRQF_DISABLED | IRQF_PERCPU,
  61         .name           = "IPI_call"
  62 };
  63
  64 void __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
  70 void __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 */