arch/mips/loongson64/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                 do_perfcnt_IRQ();
  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 static struct irqaction cascade_irqaction = {
  39         .handler = no_action,
  40         .name = "cascade",
  41         .flags = IRQF_NO_THREAD,
  42 };
  43
  44 void __init mach_init_irq(void)
  45 {
  46         /* init all controller
  47          *   0-15         ------> i8259 interrupt
  48          *   16-23        ------> mips cpu interrupt
  49          *   32-63        ------> bonito irq
  50          */
  51
  52         /* most bonito irq should be level triggered */
  53         LOONGSON_INTEDGE = LOONGSON_ICU_SYSTEMERR | LOONGSON_ICU_MASTERERR |
  54             LOONGSON_ICU_RETRYERR | LOONGSON_ICU_MBOXES;
  55
  56         /* Sets the first-level interrupt dispatcher. */
  57         mips_cpu_irq_init();
  58         init_i8259_irqs();
  59         bonito_irq_init();
  60
  61         /* bonito irq at IP2 */
  62         setup_irq(MIPS_CPU_IRQ_BASE + 2, &cascade_irqaction);
  63         /* 8259 irq at IP5 */
  64         setup_irq(MIPS_CPU_IRQ_BASE + 5, &cascade_irqaction);
  65 }