1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar 4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King 5 * 6 * This file contains the dummy interrupt chip implementation 7 */ 8 #include <linux/interrupt.h> 9 #include <linux/irq.h> 10 #include <linux/export.h> 11 12 #include "internals.h" 13 14 /* 15 * What should we do if we get a hw irq event on an illegal vector? 16 * Each architecture has to answer this themselves. 17 */ 18 static void ack_bad(struct irq_data *data) 19 { 20 struct irq_desc *desc = irq_data_to_desc(data); 21 22 print_irq_desc(data->irq, desc); 23 ack_bad_irq(data->irq); 24 } 25 26 /* 27 * NOP functions 28 */ 29 static void noop(struct irq_data *data) { } 30 31 static unsigned int noop_ret(struct irq_data *data) 32 { 33 return 0; 34 } 35 36 /* 37 * Generic no controller implementation 38 */ 39 struct irq_chip no_irq_chip = { 40 .name = "none", 41 .irq_startup = noop_ret, 42 .irq_shutdown = noop, 43 .irq_enable = noop, 44 .irq_disable = noop, 45 .irq_ack = ack_bad, 46 .flags = IRQCHIP_SKIP_SET_WAKE, 47 }; 48 49 /* 50 * Generic dummy implementation which can be used for 51 * real dumb interrupt sources 52 */ 53 struct irq_chip dummy_irq_chip = { 54 .name = "dummy", 55 .irq_startup = noop_ret, 56 .irq_shutdown = noop, 57 .irq_enable = noop, 58 .irq_disable = noop, 59 .irq_ack = noop, 60 .irq_mask = noop, 61 .irq_unmask = noop, 62 .flags = IRQCHIP_SKIP_SET_WAKE, 63 }; 64 EXPORT_SYMBOL_GPL(dummy_irq_chip); 65