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 #include <linux/export.h> 22 23 #include <asm/prom.h> 24 25 static u32 concurrent_irq; 26 27 void __irq_entry do_IRQ(struct pt_regs *regs) 28 { 29 unsigned int irq; 30 struct pt_regs *old_regs = set_irq_regs(regs); 31 trace_hardirqs_off(); 32 33 irq_enter(); 34 irq = get_irq(regs); 35 next_irq: 36 BUG_ON(irq == -1U); 37 generic_handle_irq(irq); 38 39 irq = get_irq(regs); 40 if (irq != -1U) { 41 pr_debug("next irq: %d\n", irq); 42 ++concurrent_irq; 43 goto next_irq; 44 } 45 46 irq_exit(); 47 set_irq_regs(old_regs); 48 trace_hardirqs_on(); 49 } 50 51 /* MS: There is no any advance mapping mechanism. We are using simple 32bit 52 intc without any cascades or any connection that's why mapping is 1:1 */ 53 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq) 54 { 55 return hwirq; 56 } 57 EXPORT_SYMBOL_GPL(irq_create_mapping); 58 59 unsigned int irq_create_of_mapping(struct device_node *controller, 60 const u32 *intspec, unsigned int intsize) 61 { 62 return intspec[0]; 63 } 64 EXPORT_SYMBOL_GPL(irq_create_of_mapping); 65