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 */
19 void __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 */
42 void 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
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