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/of_irq.h> 21 22 #include <asm/prom.h> 23 24 static u32 concurrent_irq; 25 26 void __irq_entry do_IRQ(struct pt_regs *regs) 27 { 28 unsigned int irq; 29 struct pt_regs *old_regs = set_irq_regs(regs); 30 trace_hardirqs_off(); 31 32 irq_enter(); 33 irq = get_irq(regs); 34 next_irq: 35 BUG_ON(irq == -1U); 36 generic_handle_irq(irq); 37 38 irq = get_irq(regs); 39 if (irq != -1U) { 40 pr_debug("next irq: %d\n", irq); 41 ++concurrent_irq; 42 goto next_irq; 43 } 44 45 irq_exit(); 46 set_irq_regs(old_regs); 47 trace_hardirqs_on(); 48 } 49 50 /* MS: There is no any advance mapping mechanism. We are using simple 32bit 51 intc without any cascades or any connection that's why mapping is 1:1 */ 52 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq) 53 { 54 return hwirq; 55 } 56 EXPORT_SYMBOL_GPL(irq_create_mapping); 57 58 unsigned int irq_create_of_mapping(struct device_node *controller, 59 const u32 *intspec, unsigned int intsize) 60 { 61 return intspec[0]; 62 } 63 EXPORT_SYMBOL_GPL(irq_create_of_mapping); 64