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/irq.h" 27 #include "hw/or-irq.h" 28 #include "hw/qdev-properties.h" 29 #include "migration/vmstate.h" 30 #include "qemu/module.h" 31 32 static void or_irq_handler(void *opaque, int n, int level) 33 { 34 qemu_or_irq *s = OR_IRQ(opaque); 35 int or_level = 0; 36 int i; 37 38 s->levels[n] = level; 39 40 for (i = 0; i < s->num_lines; i++) { 41 or_level |= s->levels[i]; 42 } 43 44 qemu_set_irq(s->out_irq, or_level); 45 } 46 47 static void or_irq_reset(DeviceState *dev) 48 { 49 qemu_or_irq *s = OR_IRQ(dev); 50 int i; 51 52 for (i = 0; i < MAX_OR_LINES; i++) { 53 s->levels[i] = false; 54 } 55 } 56 57 static void or_irq_realize(DeviceState *dev, Error **errp) 58 { 59 qemu_or_irq *s = OR_IRQ(dev); 60 61 assert(s->num_lines <= MAX_OR_LINES); 62 63 qdev_init_gpio_in(dev, or_irq_handler, s->num_lines); 64 } 65 66 static void or_irq_init(Object *obj) 67 { 68 qemu_or_irq *s = OR_IRQ(obj); 69 70 qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1); 71 } 72 73 /* The original version of this device had a fixed 16 entries in its 74 * VMState array; devices with more inputs than this need to 75 * migrate the extra lines via a subsection. 76 * The subsection migrates as much of the levels[] array as is needed 77 * (including repeating the first 16 elements), to avoid the awkwardness 78 * of splitting it in two to meet the requirements of VMSTATE_VARRAY_UINT16. 79 */ 80 #define OLD_MAX_OR_LINES 16 81 #if MAX_OR_LINES < OLD_MAX_OR_LINES 82 #error MAX_OR_LINES must be at least 16 for migration compatibility 83 #endif 84 85 static bool vmstate_extras_needed(void *opaque) 86 { 87 qemu_or_irq *s = OR_IRQ(opaque); 88 89 return s->num_lines >= OLD_MAX_OR_LINES; 90 } 91 92 static const VMStateDescription vmstate_or_irq_extras = { 93 .name = "or-irq-extras", 94 .version_id = 1, 95 .minimum_version_id = 1, 96 .needed = vmstate_extras_needed, 97 .fields = (VMStateField[]) { 98 VMSTATE_VARRAY_UINT16_UNSAFE(levels, qemu_or_irq, num_lines, 0, 99 vmstate_info_bool, bool), 100 VMSTATE_END_OF_LIST(), 101 }, 102 }; 103 104 static const VMStateDescription vmstate_or_irq = { 105 .name = TYPE_OR_IRQ, 106 .version_id = 1, 107 .minimum_version_id = 1, 108 .fields = (VMStateField[]) { 109 VMSTATE_BOOL_SUB_ARRAY(levels, qemu_or_irq, 0, OLD_MAX_OR_LINES), 110 VMSTATE_END_OF_LIST(), 111 }, 112 .subsections = (const VMStateDescription*[]) { 113 &vmstate_or_irq_extras, 114 NULL 115 }, 116 }; 117 118 static Property or_irq_properties[] = { 119 DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1), 120 DEFINE_PROP_END_OF_LIST(), 121 }; 122 123 static void or_irq_class_init(ObjectClass *klass, void *data) 124 { 125 DeviceClass *dc = DEVICE_CLASS(klass); 126 127 dc->reset = or_irq_reset; 128 device_class_set_props(dc, or_irq_properties); 129 dc->realize = or_irq_realize; 130 dc->vmsd = &vmstate_or_irq; 131 132 /* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */ 133 dc->user_creatable = false; 134 } 135 136 static const TypeInfo or_irq_type_info = { 137 .name = TYPE_OR_IRQ, 138 .parent = TYPE_DEVICE, 139 .instance_size = sizeof(qemu_or_irq), 140 .instance_init = or_irq_init, 141 .class_init = or_irq_class_init, 142 }; 143 144 static void or_irq_register_types(void) 145 { 146 type_register_static(&or_irq_type_info); 147 } 148 149 type_init(or_irq_register_types) 150