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