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