arch/riscv/kernel/irq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  * Copyright (C) 2017 SiFive
   5  * Copyright (C) 2018 Christoph Hellwig
   6  */
   7
   8 #include <linux/interrupt.h>
   9 #include <linux/irqchip.h>
  10 #include <linux/irqdomain.h>
  11 #include <linux/seq_file.h>
  12 #include <asm/smp.h>
  13
  14 int arch_show_interrupts(struct seq_file *p, int prec)
  15 {
  16         show_ipi_stats(p, prec);
  17         return 0;
  18 }
  19
  20 asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
  21 {
  22         struct pt_regs *old_regs = set_irq_regs(regs);
  23
  24         irq_enter();
  25         switch (regs->cause & ~CAUSE_IRQ_FLAG) {
  26         case RV_IRQ_TIMER:
  27                 riscv_timer_interrupt();
  28                 break;
  29 #ifdef CONFIG_SMP
  30         case RV_IRQ_SOFT:
  31                 /*
  32                  * We only use software interrupts to pass IPIs, so if a non-SMP
  33                  * system gets one, then we don't know what to do.
  34                  */
  35                 riscv_software_interrupt();
  36                 break;
  37 #endif
  38         case RV_IRQ_EXT:
  39                 handle_arch_irq(regs);
  40                 break;
  41         default:
  42                 pr_alert("unexpected interrupt cause 0x%lx", regs->cause);
  43                 BUG();
  44         }
  45         irq_exit();
  46
  47         set_irq_regs(old_regs);
  48 }
  49
  50 void __init init_IRQ(void)
  51 {
  52         irqchip_init();
  53 }