LXR qemu/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
  28static 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
  43static 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
  53static 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
  62static 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
  81static 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
  88static 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
 100static 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
 114static Property or_irq_properties[] = {
 115    DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1),
 116    DEFINE_PROP_END_OF_LIST(),
 117};
 118
 119static 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
 132static 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
 140static void or_irq_register_types(void)
 141{
 142    type_register_static(&or_irq_type_info);
 143}
 144
 145type_init(or_irq_register_types)
 146