hw/misc/bcm2835_power.c

   1 /*
   2  * Raspberry Pi emulation (c) 2012 Gregory Estrade
   3  * This code is licensed under the GNU GPLv2 and later.
   4  */
   5
   6 #include "hw/misc/bcm2835_power.h"
   7 #include "hw/misc/bcm2835_mbox_defs.h"
   8
   9 static uint64_t bcm2835_power_read(void *opaque, hwaddr offset, unsigned size)
  10 {
  11     BCM2835PowerState *s = (BCM2835PowerState *)opaque;
  12     uint32_t res = 0;
  13
  14     switch (offset) {
  15     case 0:
  16         res = MBOX_CHAN_POWER;
  17         s->pending = 0;
  18         qemu_set_irq(s->mbox_irq, 0);
  19         break;
  20     case 4:
  21         res = s->pending;
  22         break;
  23     default:
  24         qemu_log_mask(LOG_GUEST_ERROR,
  25             "bcm2835_power_read: Bad offset %x\n", (int)offset);
  26         return 0;
  27     }
  28     return res;
  29 }
  30
  31 static void bcm2835_power_write(void *opaque, hwaddr offset, uint64_t value,
  32                                 unsigned size)
  33 {
  34     BCM2835PowerState *s = (BCM2835PowerState *)opaque;
  35     switch (offset) {
  36     case 0:
  37         s->pending = 1;
  38         qemu_set_irq(s->mbox_irq, 1);
  39         break;
  40     default:
  41         qemu_log_mask(LOG_GUEST_ERROR,
  42             "bcm2835_power_write: Bad offset %x\n", (int)offset);
  43         return;
  44     }
  45
  46 }
  47
  48 static const MemoryRegionOps bcm2835_power_ops = {
  49     .read = bcm2835_power_read,
  50     .write = bcm2835_power_write,
  51     .endianness = DEVICE_NATIVE_ENDIAN,
  52 };
  53
  54 static const VMStateDescription vmstate_bcm2835_power = {
  55     .name = TYPE_BCM2835_POWER,
  56     .version_id = 1,
  57     .minimum_version_id = 1,
  58     .minimum_version_id_old = 1,
  59     .fields      = (VMStateField[]) {
  60         VMSTATE_END_OF_LIST()
  61     }
  62 };
  63
  64 static void bcm2835_power_init(Object *obj)
  65 {
  66     BCM2835PowerState *s = BCM2835_POWER(obj);
  67
  68     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
  69     memory_region_init_io(&s->iomem, obj, &bcm2835_power_ops, s,
  70                           TYPE_BCM2835_POWER, 0x10);
  71     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
  72 }
  73
  74 static void bcm2835_power_realize(DeviceState *dev, Error **errp)
  75 {
  76     BCM2835PowerState *s = BCM2835_POWER(dev);
  77
  78     s->pending = 0;
  79 }
  80
  81 static void bcm2835_power_class_init(ObjectClass *klass, void *data)
  82 {
  83     DeviceClass *dc = DEVICE_CLASS(klass);
  84
  85     dc->realize = bcm2835_power_realize;
  86     dc->vmsd = &vmstate_bcm2835_power;
  87 }
  88
  89 static TypeInfo bcm2835_power_info = {
  90     .name          = TYPE_BCM2835_POWER,
  91     .parent        = TYPE_SYS_BUS_DEVICE,
  92     .instance_size = sizeof(BCM2835PowerState),
  93     .class_init    = bcm2835_power_class_init,
  94     .instance_init = bcm2835_power_init,
  95 };
  96
  97 static void bcm2835_power_register_types(void)
  98 {
  99     type_register_static(&bcm2835_power_info);
 100 }
 101
 102 type_init(bcm2835_power_register_types)