1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
4 */
5
6#include <linux/interrupt.h>
7#include <linux/irqchip.h>
8#include <asm/mach_desc.h>
9
10#include <asm/irq_regs.h>
11#include <asm/smp.h>
12
13/*
14 * Late Interrupt system init called from start_kernel for Boot CPU only
15 *
16 * Since slab must already be initialized, platforms can start doing any
17 * needed request_irq( )s
18 */
19void __init init_IRQ(void)
20{
21	/*
22	 * process the entire interrupt tree in one go
23	 * Any external intc will be setup provided DT chains them
24	 * properly
25	 */
26	irqchip_init();
27
28#ifdef CONFIG_SMP
29	/* a SMP H/w block could do IPI IRQ request here */
30	if (plat_smp_ops.init_per_cpu)
31		plat_smp_ops.init_per_cpu(smp_processor_id());
32#endif
33
34	if (machine_desc->init_per_cpu)
35		machine_desc->init_per_cpu(smp_processor_id());
36}
37
38/*
39 * "C" Entry point for any ARC ISR, called from low level vector handler
40 * @irq is the vector number read from ICAUSE reg of on-chip intc
41 */
42void arch_do_IRQ(unsigned int hwirq, struct pt_regs *regs)
43{
44	struct pt_regs *old_regs;
45
46	irq_enter();
47	old_regs = set_irq_regs(regs);
48	generic_handle_domain_irq(NULL, hwirq);
49	set_irq_regs(old_regs);
50	irq_exit();
51}
52