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 28 static void or_irq_handler(void *opaque, int n, int level) 29 { 30 qemu_or_irq *s = OR_IRQ(opaque); 31 int or_level = 0; 32 int i; 33 34 s->levels[n] = level; 35 36 for (i = 0; i < s->num_lines; i++) { 37 or_level |= s->levels[i]; 38 } 39 40 qemu_set_irq(s->out_irq, or_level); 41 } 42 43 static void or_irq_reset(DeviceState *dev) 44 { 45 qemu_or_irq *s = OR_IRQ(dev); 46 int i; 47 48 for (i = 0; i < MAX_OR_LINES; i++) { 49 s->levels[i] = false; 50 } 51 } 52 53 static void or_irq_realize(DeviceState *dev, Error **errp) 54 { 55 qemu_or_irq *s = OR_IRQ(dev); 56 57 assert(s->num_lines < MAX_OR_LINES); 58 59 qdev_init_gpio_in(dev, or_irq_handler, s->num_lines); 60 } 61 62 static void or_irq_init(Object *obj) 63 { 64 qemu_or_irq *s = OR_IRQ(obj); 65 66 qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1); 67 } 68 69 /* The original version of this device had a fixed 16 entries in its 70 * VMState array; devices with more inputs than this need to 71 * migrate the extra lines via a subsection. 72 * The subsection migrates as much of the levels[] array as is needed 73 * (including repeating the first 16 elements), to avoid the awkwardness 74 * of splitting it in two to meet the requirements of VMSTATE_VARRAY_UINT16. 75 */ 76 #define OLD_MAX_OR_LINES 16 77 #if MAX_OR_LINES < OLD_MAX_OR_LINES 78 #error MAX_OR_LINES must be at least 16 for migration compatibility 79 #endif 80 81 static bool vmstate_extras_needed(void *opaque) 82 { 83 qemu_or_irq *s = OR_IRQ(opaque); 84 85 return s->num_lines >= OLD_MAX_OR_LINES; 86 } 87 88 static const VMStateDescription vmstate_or_irq_extras = { 89 .name = "or-irq-extras", 90 .version_id = 1, 91 .minimum_version_id = 1, 92 .needed = vmstate_extras_needed, 93 .fields = (VMStateField[]) { 94 VMSTATE_VARRAY_UINT16_UNSAFE(levels, qemu_or_irq, num_lines, 0, 95 vmstate_info_bool, bool), 96 VMSTATE_END_OF_LIST(), 97 }, 98 }; 99 100 static const VMStateDescription vmstate_or_irq = { 101 .name = TYPE_OR_IRQ, 102 .version_id = 1, 103 .minimum_version_id = 1, 104 .fields = (VMStateField[]) { 105 VMSTATE_BOOL_SUB_ARRAY(levels, qemu_or_irq, 0, OLD_MAX_OR_LINES), 106 VMSTATE_END_OF_LIST(), 107 }, 108 .subsections = (const VMStateDescription*[]) { 109 &vmstate_or_irq_extras, 110 NULL 111 }, 112 }; 113 114 static Property or_irq_properties[] = { 115 DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1), 116 DEFINE_PROP_END_OF_LIST(), 117 }; 118 119 static void or_irq_class_init(ObjectClass *klass, void *data) 120 { 121 DeviceClass *dc = DEVICE_CLASS(klass); 122 123 dc->reset = or_irq_reset; 124 dc->props = or_irq_properties; 125 dc->realize = or_irq_realize; 126 dc->vmsd = &vmstate_or_irq; 127 128 /* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */ 129 dc->user_creatable = false; 130 } 131 132 static const TypeInfo or_irq_type_info = { 133 .name = TYPE_OR_IRQ, 134 .parent = TYPE_DEVICE, 135 .instance_size = sizeof(qemu_or_irq), 136 .instance_init = or_irq_init, 137 .class_init = or_irq_class_init, 138 }; 139 140 static void or_irq_register_types(void) 141 { 142 type_register_static(&or_irq_type_info); 143 } 144 145 type_init(or_irq_register_types) 146