1 /* 2 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar 3 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King 4 * 5 * This file contains the dummy interrupt chip implementation 6 */ 7 #include <linux/interrupt.h> 8 #include <linux/irq.h> 9 #include <linux/export.h> 10 11 #include "internals.h" 12 13 /* 14 * What should we do if we get a hw irq event on an illegal vector? 15 * Each architecture has to answer this themself. 16 */ 17 static void ack_bad(struct irq_data *data) 18 { 19 struct irq_desc *desc = irq_data_to_desc(data); 20 21 print_irq_desc(data->irq, desc); 22 ack_bad_irq(data->irq); 23 } 24 25 /* 26 * NOP functions 27 */ 28 static void noop(struct irq_data *data) { } 29 30 static unsigned int noop_ret(struct irq_data *data) 31 { 32 return 0; 33 } 34 35 /* 36 * Generic no controller implementation 37 */ 38 struct irq_chip no_irq_chip = { 39 .name = "none", 40 .irq_startup = noop_ret, 41 .irq_shutdown = noop, 42 .irq_enable = noop, 43 .irq_disable = noop, 44 .irq_ack = ack_bad, 45 .flags = IRQCHIP_SKIP_SET_WAKE, 46 }; 47 48 /* 49 * Generic dummy implementation which can be used for 50 * real dumb interrupt sources 51 */ 52 struct irq_chip dummy_irq_chip = { 53 .name = "dummy", 54 .irq_startup = noop_ret, 55 .irq_shutdown = noop, 56 .irq_enable = noop, 57 .irq_disable = noop, 58 .irq_ack = noop, 59 .irq_mask = noop, 60 .irq_unmask = noop, 61 .flags = IRQCHIP_SKIP_SET_WAKE, 62 }; 63 EXPORT_SYMBOL_GPL(dummy_irq_chip); 64