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