arch/mips/pmcs-msp71xx/msp_smp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
   4  * Copyright (C) 2001 Ralf Baechle
   5  * Copyright (C) 2010 PMC-Sierra, Inc.
   6  *
   7  *  VSMP support for MSP platforms . Derived from malta vsmp support.
   8  */
   9 #include <linux/smp.h>
  10 #include <linux/interrupt.h>
  11
  12 #include <asm/setup.h>
  13
  14 #ifdef CONFIG_MIPS_MT_SMP
  15 #define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
  16 #define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for call */
  17
  18
  19 static void ipi_resched_dispatch(void)
  20 {
  21         do_IRQ(MIPS_CPU_IPI_RESCHED_IRQ);
  22 }
  23
  24 static void ipi_call_dispatch(void)
  25 {
  26         do_IRQ(MIPS_CPU_IPI_CALL_IRQ);
  27 }
  28
  29 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
  30 {
  31         return IRQ_HANDLED;
  32 }
  33
  34 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
  35 {
  36         generic_smp_call_function_interrupt();
  37
  38         return IRQ_HANDLED;
  39 }
  40
  41 void __init arch_init_ipiirq(int irq, const char *name, irq_handler_t handler)
  42 {
  43         if (request_irq(irq, handler, IRQF_PERCPU, name, NULL))
  44                 pr_err("Failed to request irq %d (%s)\n", irq, name);
  45         irq_set_handler(irq, handle_percpu_irq);
  46 }
  47
  48 void __init msp_vsmp_int_init(void)
  49 {
  50         set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
  51         set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
  52         arch_init_ipiirq(MIPS_CPU_IPI_RESCHED_IRQ, "IPI_resched",
  53                          ipi_resched_interrupt);
  54         arch_init_ipiirq(MIPS_CPU_IPI_CALL_IRQ, "IPI_call", ipi_call_interrupt);
  55 }
  56 #endif /* CONFIG_MIPS_MT_SMP */