1 /* 2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> 3 * Copyright (C) 2007-2009 PetaLogix 4 * Copyright (C) 2006 Atmark Techno, Inc. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/ftrace.h> 13 #include <linux/kernel.h> 14 #include <linux/hardirq.h> 15 #include <linux/interrupt.h> 16 #include <linux/irqflags.h> 17 #include <linux/seq_file.h> 18 #include <linux/kernel_stat.h> 19 #include <linux/irq.h> 20 #include <linux/irqchip.h> 21 #include <linux/of_irq.h> 22 23 static u32 concurrent_irq; 24 25 void __irq_entry do_IRQ(struct pt_regs *regs) 26 { 27 unsigned int irq; 28 struct pt_regs *old_regs = set_irq_regs(regs); 29 trace_hardirqs_off(); 30 31 irq_enter(); 32 irq = get_irq(); 33 next_irq: 34 BUG_ON(!irq); 35 generic_handle_irq(irq); 36 37 irq = get_irq(); 38 if (irq != -1U) { 39 pr_debug("next irq: %d\n", irq); 40 ++concurrent_irq; 41 goto next_irq; 42 } 43 44 irq_exit(); 45 set_irq_regs(old_regs); 46 trace_hardirqs_on(); 47 } 48 49 void __init init_IRQ(void) 50 { 51 /* process the entire interrupt tree in one go */ 52 irqchip_init(); 53 } 54