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 } 44