1 /* 2 * IRQ splitter device. 3 * 4 * Copyright (c) 2018 Linaro Limited. 5 * Written by Peter Maydell 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "hw/core/split-irq.h" 28 #include "hw/irq.h" 29 #include "hw/qdev-properties.h" 30 #include "qapi/error.h" 31 #include "qemu/module.h" 32 33 static void split_irq_handler(void *opaque, int n, int level) 34 { 35 SplitIRQ *s = SPLIT_IRQ(opaque); 36 int i; 37 38 for (i = 0; i < s->num_lines; i++) { 39 qemu_set_irq(s->out_irq[i], level); 40 } 41 } 42 43 static void split_irq_init(Object *obj) 44 { 45 qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1); 46 } 47 48 static void split_irq_realize(DeviceState *dev, Error **errp) 49 { 50 SplitIRQ *s = SPLIT_IRQ(dev); 51 52 if (s->num_lines < 1 || s->num_lines >= MAX_SPLIT_LINES) { 53 error_setg(errp, 54 "IRQ splitter number of lines %d is not between 1 and %d", 55 s->num_lines, MAX_SPLIT_LINES); 56 return; 57 } 58 59 qdev_init_gpio_out(dev, s->out_irq, s->num_lines); 60 } 61 62 static Property split_irq_properties[] = { 63 DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1), 64 DEFINE_PROP_END_OF_LIST(), 65 }; 66 67 static void split_irq_class_init(ObjectClass *klass, void *data) 68 { 69 DeviceClass *dc = DEVICE_CLASS(klass); 70 71 /* No state to reset or migrate */ 72 device_class_set_props(dc, split_irq_properties); 73 dc->realize = split_irq_realize; 74 75 /* Reason: Needs to be wired up to work */ 76 dc->user_creatable = false; 77 } 78 79 static const TypeInfo split_irq_type_info = { 80 .name = TYPE_SPLIT_IRQ, 81 .parent = TYPE_DEVICE, 82 .instance_size = sizeof(SplitIRQ), 83 .instance_init = split_irq_init, 84 .class_init = split_irq_class_init, 85 }; 86 87 static void split_irq_register_types(void) 88 { 89 type_register_static(&split_irq_type_info); 90 } 91 92 type_init(split_irq_register_types) 93