hw/core/or-irq.c

   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)