arch/mips/loongson2ef/fuloong-2e/irq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology
   4  * Author: Fuxin Zhang, zhangfx@lemote.com
   5  */
   6 #include <linux/interrupt.h>
   7
   8 #include <asm/irq_cpu.h>
   9 #include <asm/i8259.h>
  10
  11 #include <loongson.h>
  12
  13 static void i8259_irqdispatch(void)
  14 {
  15         int irq;
  16
  17         irq = i8259_irq();
  18         if (irq >= 0)
  19                 do_IRQ(irq);
  20         else
  21                 spurious_interrupt();
  22 }
  23
  24 asmlinkage void mach_irq_dispatch(unsigned int pending)
  25 {
  26         if (pending & CAUSEF_IP7)
  27                 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
  28         else if (pending & CAUSEF_IP6) /* perf counter loverflow */
  29                 return;
  30         else if (pending & CAUSEF_IP5)
  31                 i8259_irqdispatch();
  32         else if (pending & CAUSEF_IP2)
  33                 bonito_irqdispatch();
  34         else
  35                 spurious_interrupt();
  36 }
  37
  38 void __init mach_init_irq(void)
  39 {
  40         int irq;
  41
  42         /* init all controller
  43          *   0-15         ------> i8259 interrupt
  44          *   16-23        ------> mips cpu interrupt
  45          *   32-63        ------> bonito irq
  46          */
  47
  48         /* most bonito irq should be level triggered */
  49         LOONGSON_INTEDGE = LOONGSON_ICU_SYSTEMERR | LOONGSON_ICU_MASTERERR |
  50             LOONGSON_ICU_RETRYERR | LOONGSON_ICU_MBOXES;
  51
  52         /* Sets the first-level interrupt dispatcher. */
  53         mips_cpu_irq_init();
  54         init_i8259_irqs();
  55         bonito_irq_init();
  56
  57         /* bonito irq at IP2 */
  58         irq = MIPS_CPU_IRQ_BASE + 2;
  59         if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
  60                 pr_err("Failed to request irq %d (cascade)\n", irq);
  61         /* 8259 irq at IP5 */
  62         irq = MIPS_CPU_IRQ_BASE + 5;
  63         if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
  64                 pr_err("Failed to request irq %d (cascade)\n", irq);
  65 }