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