1 /* 2 * QEMU IRQ/GPIO common code. 3 * 4 * Copyright (c) 2016 Alistair Francis <alistair@alistair23.me>. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/or-irq.h" 27 #include "qemu/module.h" 28 29 static void or_irq_handler(void *opaque, int n, int level) 30 { 31 qemu_or_irq *s = OR_IRQ(opaque); 32 int or_level = 0; 33 int i; 34 35 s->levels[n] = level; 36 37 for (i = 0; i < s->num_lines; i++) { 38 or_level |= s->levels[i]; 39 } 40 41 qemu_set_irq(s->out_irq, or_level); 42 } 43 44 static void or_irq_reset(DeviceState *dev) 45 { 46 qemu_or_irq *s = OR_IRQ(dev); 47 int i; 48 49 for (i = 0; i < MAX_OR_LINES; i++) { 50 s->levels[i] = false; 51 } 52 } 53 54 static void or_irq_realize(DeviceState *dev, Error **errp) 55 { 56 qemu_or_irq *s = OR_IRQ(dev); 57 58 assert(s->num_lines < MAX_OR_LINES); 59 60 qdev_init_gpio_in(dev, or_irq_handler, s->num_lines); 61 } 62 63 static void or_irq_init(Object *obj) 64 { 65 qemu_or_irq *s = OR_IRQ(obj); 66 67 qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1); 68 } 69 70 /* The original version of this device had a fixed 16 entries in its 71 * VMState array; devices with more inputs than this need to 72 * migrate the extra lines via a subsection. 73 * The subsection migrates as much of the levels[] array as is needed 74 * (including repeating the first 16 elements), to avoid the awkwardness 75 * of splitting it in two to meet the requirements of VMSTATE_VARRAY_UINT16. 76 */ 77 #define OLD_MAX_OR_LINES 16 78 #if MAX_OR_LINES < OLD_MAX_OR_LINES 79 #error MAX_OR_LINES must be at least 16 for migration compatibility 80 #endif 81 82 static bool vmstate_extras_needed(void *opaque) 83 { 84 qemu_or_irq *s = OR_IRQ(opaque); 85 86 return s->num_lines >= OLD_MAX_OR_LINES; 87 } 88 89 static const VMStateDescription vmstate_or_irq_extras = { 90 .name = "or-irq-extras", 91 .version_id = 1, 92 .minimum_version_id = 1, 93 .needed = vmstate_extras_needed, 94 .fields = (VMStateField[]) { 95 VMSTATE_VARRAY_UINT16_UNSAFE(levels, qemu_or_irq, num_lines, 0, 96 vmstate_info_bool, bool), 97 VMSTATE_END_OF_LIST(), 98 }, 99 }; 100 101 static const VMStateDescription vmstate_or_irq = { 102 .name = TYPE_OR_IRQ, 103 .version_id = 1, 104 .minimum_version_id = 1, 105 .fields = (VMStateField[]) { 106 VMSTATE_BOOL_SUB_ARRAY(levels, qemu_or_irq, 0, OLD_MAX_OR_LINES), 107 VMSTATE_END_OF_LIST(), 108 }, 109 .subsections = (const VMStateDescription*[]) { 110 &vmstate_or_irq_extras, 111 NULL 112 }, 113 }; 114 115 static Property or_irq_properties[] = { 116 DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1), 117 DEFINE_PROP_END_OF_LIST(), 118 }; 119 120 static void or_irq_class_init(ObjectClass *klass, void *data) 121 { 122 DeviceClass *dc = DEVICE_CLASS(klass); 123 124 dc->reset = or_irq_reset; 125 dc->props = or_irq_properties; 126 dc->realize = or_irq_realize; 127 dc->vmsd = &vmstate_or_irq; 128 129 /* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */ 130 dc->user_creatable = false; 131 } 132 133 static const TypeInfo or_irq_type_info = { 134 .name = TYPE_OR_IRQ, 135 .parent = TYPE_DEVICE, 136 .instance_size = sizeof(qemu_or_irq), 137 .instance_init = or_irq_init, 138 .class_init = or_irq_class_init, 139 }; 140 141 static void or_irq_register_types(void) 142 { 143 type_register_static(&or_irq_type_info); 144 } 145 146 type_init(or_irq_register_types) 147