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 int show_interrupts(struct seq_file *p, void *v) 51 { 52 int i = *(loff_t *) v, j; 53 struct irq_desc *desc; 54 struct irqaction *action; 55 unsigned long flags; 56 57 if (i == 0) { 58 seq_printf(p, " "); 59 for_each_online_cpu(j) 60 seq_printf(p, "CPU%-8d", j); 61 seq_putc(p, '\n'); 62 } 63 64 if (i < nr_irq) { 65 desc = irq_to_desc(i); 66 raw_spin_lock_irqsave(&desc->lock, flags); 67 action = desc->action; 68 if (!action) 69 goto skip; 70 seq_printf(p, "%3d: ", i); 71 #ifndef CONFIG_SMP 72 seq_printf(p, "%10u ", kstat_irqs(i)); 73 #else 74 for_each_online_cpu(j) 75 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 76 #endif 77 seq_printf(p, " %8s", desc->status & 78 IRQ_LEVEL ? "level" : "edge"); 79 seq_printf(p, " %8s", desc->irq_data.chip->name); 80 seq_printf(p, " %s", action->name); 81 82 for (action = action->next; action; action = action->next) 83 seq_printf(p, ", %s", action->name); 84 85 seq_putc(p, '\n'); 86 skip: 87 raw_spin_unlock_irqrestore(&desc->lock, flags); 88 } 89 return 0; 90 } 91 92 /* MS: There is no any advance mapping mechanism. We are using simple 32bit 93 intc without any cascades or any connection that's why mapping is 1:1 */ 94 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq) 95 { 96 return hwirq; 97 } 98 EXPORT_SYMBOL_GPL(irq_create_mapping); 99 100 unsigned int irq_create_of_mapping(struct device_node *controller, 101 const u32 *intspec, unsigned int intsize) 102 { 103 return intspec[0]; 104 } 105 EXPORT_SYMBOL_GPL(irq_create_of_mapping); 106