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 #include <asm/smp.h>
10
11 /*
12 * Late Interrupt system init called from start_kernel for Boot CPU only
13 *
14 * Since slab must already be initialized, platforms can start doing any
15 * needed request_irq( )s
16 */
17 void __init init_IRQ(void)
18 {
19 /*
20 * process the entire interrupt tree in one go
21 * Any external intc will be setup provided DT chains them
22 * properly
23 */
24 irqchip_init();
25
26 #ifdef CONFIG_SMP
27 /* a SMP H/w block could do IPI IRQ request here */
28 if (plat_smp_ops.init_per_cpu)
29 plat_smp_ops.init_per_cpu(smp_processor_id());
30 #endif
31
32 if (machine_desc->init_per_cpu)
33 machine_desc->init_per_cpu(smp_processor_id());
34 }
35
36 /*
37 * "C" Entry point for any ARC ISR, called from low level vector handler
38 * @irq is the vector number read from ICAUSE reg of on-chip intc
39 */
40 void arch_do_IRQ(unsigned int hwirq, struct pt_regs *regs)
41 {
42 handle_domain_irq(NULL, hwirq, regs);
43 }