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/kernel.h> 13 #include <linux/hardirq.h> 14 #include <linux/interrupt.h> 15 #include <linux/irqflags.h> 16 #include <linux/seq_file.h> 17 #include <linux/kernel_stat.h> 18 #include <linux/irq.h> 19 20 #include <asm/prom.h> 21 22 unsigned int irq_of_parse_and_map(struct device_node *dev, int index) 23 { 24 struct of_irq oirq; 25 26 if (of_irq_map_one(dev, index, &oirq)) 27 return NO_IRQ; 28 29 return oirq.specifier[0]; 30 } 31 EXPORT_SYMBOL_GPL(irq_of_parse_and_map); 32 33 /* 34 * 'what should we do if we get a hw irq event on an illegal vector'. 35 * each architecture has to answer this themselves. 36 */ 37 void ack_bad_irq(unsigned int irq) 38 { 39 printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq); 40 } 41 42 static u32 concurrent_irq; 43 44 void do_IRQ(struct pt_regs *regs) 45 { 46 unsigned int irq; 47 struct pt_regs *old_regs = set_irq_regs(regs); 48 49 irq_enter(); 50 irq = get_irq(regs); 51 next_irq: 52 BUG_ON(irq == -1U); 53 generic_handle_irq(irq); 54 55 irq = get_irq(regs); 56 if (irq != -1U) { 57 pr_debug("next irq: %d\n", irq); 58 ++concurrent_irq; 59 goto next_irq; 60 } 61 62 irq_exit(); 63 set_irq_regs(old_regs); 64 } 65 66 int show_interrupts(struct seq_file *p, void *v) 67 { 68 int i = *(loff_t *) v, j; 69 struct irqaction *action; 70 unsigned long flags; 71 72 if (i == 0) { 73 seq_printf(p, " "); 74 for_each_online_cpu(j) 75 seq_printf(p, "CPU%-8d", j); 76 seq_putc(p, '\n'); 77 } 78 79 if (i < nr_irq) { 80 spin_lock_irqsave(&irq_desc[i].lock, flags); 81 action = irq_desc[i].action; 82 if (!action) 83 goto skip; 84 seq_printf(p, "%3d: ", i); 85 #ifndef CONFIG_SMP 86 seq_printf(p, "%10u ", kstat_irqs(i)); 87 #else 88 for_each_online_cpu(j) 89 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 90 #endif 91 seq_printf(p, " %8s", irq_desc[i].status & 92 IRQ_LEVEL ? "level" : "edge"); 93 seq_printf(p, " %8s", irq_desc[i].chip->name); 94 seq_printf(p, " %s", action->name); 95 96 for (action = action->next; action; action = action->next) 97 seq_printf(p, ", %s", action->name); 98 99 seq_putc(p, '\n'); 100 skip: 101 spin_unlock_irqrestore(&irq_desc[i].lock, flags); 102 } 103 return 0; 104 } 105