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