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 10 #include "internals.h" 11 12 /* 13 * What should we do if we get a hw irq event on an illegal vector? 14 * Each architecture has to answer this themself. 15 */ 16 static void ack_bad(struct irq_data *data) 17 { 18 struct irq_desc *desc = irq_data_to_desc(data); 19 20 print_irq_desc(data->irq, desc); 21 ack_bad_irq(data->irq); 22 } 23 24 /* 25 * NOP functions 26 */ 27 static void noop(struct irq_data *data) { } 28 29 static unsigned int noop_ret(struct irq_data *data) 30 { 31 return 0; 32 } 33 34 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED 35 static void compat_noop(unsigned int irq) { } 36 #define END_INIT .end = compat_noop 37 #else 38 #define END_INIT 39 #endif 40 41 /* 42 * Generic no controller implementation 43 */ 44 struct irq_chip no_irq_chip = { 45 .name = "none", 46 .irq_startup = noop_ret, 47 .irq_shutdown = noop, 48 .irq_enable = noop, 49 .irq_disable = noop, 50 .irq_ack = ack_bad, 51 END_INIT 52 }; 53 54 /* 55 * Generic dummy implementation which can be used for 56 * real dumb interrupt sources 57 */ 58 struct irq_chip dummy_irq_chip = { 59 .name = "dummy", 60 .irq_startup = noop_ret, 61 .irq_shutdown = noop, 62 .irq_enable = noop, 63 .irq_disable = noop, 64 .irq_ack = noop, 65 .irq_mask = noop, 66 .irq_unmask = noop, 67 END_INIT 68 }; 69