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/seq_file.h>
11#include <asm/smp.h>
12
 
 
 
 
 
 
 
13int arch_show_interrupts(struct seq_file *p, int prec)
14{
15	show_ipi_stats(p, prec);
16	return 0;
17}
18
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
19void __init init_IRQ(void)
20{
21	irqchip_init();
22	if (!handle_arch_irq)
23		panic("No interrupt controller found.");
24}

 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/*
15 * Possible interrupt causes:
16 */
17#define INTERRUPT_CAUSE_SOFTWARE	IRQ_S_SOFT
18#define INTERRUPT_CAUSE_TIMER		IRQ_S_TIMER
19#define INTERRUPT_CAUSE_EXTERNAL	IRQ_S_EXT
20
21int arch_show_interrupts(struct seq_file *p, int prec)
22{
23	show_ipi_stats(p, prec);
24	return 0;
25}
26
27asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
28{
29	struct pt_regs *old_regs = set_irq_regs(regs);
30
31	irq_enter();
32	switch (regs->scause & ~SCAUSE_IRQ_FLAG) {
33	case INTERRUPT_CAUSE_TIMER:
34		riscv_timer_interrupt();
35		break;
36#ifdef CONFIG_SMP
37	case INTERRUPT_CAUSE_SOFTWARE:
38		/*
39		 * We only use software interrupts to pass IPIs, so if a non-SMP
40		 * system gets one, then we don't know what to do.
41		 */
42		riscv_software_interrupt();
43		break;
44#endif
45	case INTERRUPT_CAUSE_EXTERNAL:
46		handle_arch_irq(regs);
47		break;
48	default:
49		pr_alert("unexpected interrupt cause 0x%lx", regs->scause);
50		BUG();
51	}
52	irq_exit();
53
54	set_irq_regs(old_regs);
55}
56
57void __init init_IRQ(void)
58{
59	irqchip_init();
 
 
60}