hw/misc/avr_power.c

   1 /*
   2  * AVR Power Reduction Management
   3  *
   4  * Copyright (c) 2019-2020 Michael Rolnik
   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/misc/avr_power.h"
  27 #include "qemu/log.h"
  28 #include "hw/qdev-properties.h"
  29 #include "hw/irq.h"
  30 #include "trace.h"
  31
  32 static void avr_mask_reset(DeviceState *dev)
  33 {
  34     AVRMaskState *s = AVR_MASK(dev);
  35
  36     s->val = 0x00;
  37
  38     for (int i = 0; i < 8; i++) {
  39         qemu_set_irq(s->irq[i], 0);
  40     }
  41 }
  42
  43 static uint64_t avr_mask_read(void *opaque, hwaddr offset, unsigned size)
  44 {
  45     assert(size == 1);
  46     assert(offset == 0);
  47     AVRMaskState *s = opaque;
  48
  49     trace_avr_power_read(s->val);
  50
  51     return (uint64_t)s->val;
  52 }
  53
  54 static void avr_mask_write(void *opaque, hwaddr offset,
  55                            uint64_t val64, unsigned size)
  56 {
  57     assert(size == 1);
  58     assert(offset == 0);
  59     AVRMaskState *s = opaque;
  60     uint8_t val8 = val64;
  61
  62     trace_avr_power_write(val8);
  63     s->val = val8;
  64     for (int i = 0; i < 8; i++) {
  65         qemu_set_irq(s->irq[i], (val8 & (1 << i)) != 0);
  66     }
  67 }
  68
  69 static const MemoryRegionOps avr_mask_ops = {
  70     .read = avr_mask_read,
  71     .write = avr_mask_write,
  72     .endianness = DEVICE_NATIVE_ENDIAN,
  73     .impl = {
  74         .max_access_size = 1,
  75     },
  76 };
  77
  78 static void avr_mask_init(Object *dev)
  79 {
  80     AVRMaskState *s = AVR_MASK(dev);
  81     SysBusDevice *busdev = SYS_BUS_DEVICE(dev);
  82
  83     memory_region_init_io(&s->iomem, dev, &avr_mask_ops, s, TYPE_AVR_MASK,
  84                           0x01);
  85     sysbus_init_mmio(busdev, &s->iomem);
  86
  87     for (int i = 0; i < 8; i++) {
  88         sysbus_init_irq(busdev, &s->irq[i]);
  89     }
  90     s->val = 0x00;
  91 }
  92
  93 static void avr_mask_class_init(ObjectClass *klass, void *data)
  94 {
  95     DeviceClass *dc = DEVICE_CLASS(klass);
  96
  97     device_class_set_legacy_reset(dc, avr_mask_reset);
  98 }
  99
 100 static const TypeInfo avr_mask_info = {
 101     .name          = TYPE_AVR_MASK,
 102     .parent        = TYPE_SYS_BUS_DEVICE,
 103     .instance_size = sizeof(AVRMaskState),
 104     .class_init    = avr_mask_class_init,
 105     .instance_init = avr_mask_init,
 106 };
 107
 108 static void avr_mask_register_types(void)
 109 {
 110     type_register_static(&avr_mask_info);
 111 }
 112
 113 type_init(avr_mask_register_types)