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 IRQ_TIMER: 27 riscv_timer_interrupt(); 28 break; 29 #ifdef CONFIG_SMP 30 case 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 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 } 54