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/*
* Allwinner Security ID emulation
*
* Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/guest-random.h"
#include "qapi/error.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "hw/misc/allwinner-sid.h"
#include "trace.h"
/* SID register offsets */
enum {
REG_PRCTL = 0x40, /* Control */
REG_RDKEY = 0x60, /* Read Key */
};
/* SID register flags */
enum {
REG_PRCTL_WRITE = 0x0002, /* Unknown write flag */
REG_PRCTL_OP_LOCK = 0xAC00, /* Lock operation */
};
static uint64_t allwinner_sid_read(void *opaque, hwaddr offset,
unsigned size)
{
const AwSidState *s = AW_SID(opaque);
uint64_t val = 0;
switch (offset) {
case REG_PRCTL: /* Control */
val = s->control;
break;
case REG_RDKEY: /* Read Key */
val = s->rdkey;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
__func__, (uint32_t)offset);
return 0;
}
trace_allwinner_sid_read(offset, val, size);
return val;
}
static void allwinner_sid_write(void *opaque, hwaddr offset,
uint64_t val, unsigned size)
{
AwSidState *s = AW_SID(opaque);
trace_allwinner_sid_write(offset, val, size);
switch (offset) {
case REG_PRCTL: /* Control */
s->control = val;
if ((s->control & REG_PRCTL_OP_LOCK) &&
(s->control & REG_PRCTL_WRITE)) {
uint32_t id = s->control >> 16;
if (id <= sizeof(QemuUUID) - sizeof(s->rdkey)) {
s->rdkey = ldl_be_p(&s->identifier.data[id]);
}
}
s->control &= ~REG_PRCTL_WRITE;
break;
case REG_RDKEY: /* Read Key */
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
__func__, (uint32_t)offset);
break;
}
}
static const MemoryRegionOps allwinner_sid_ops = {
.read = allwinner_sid_read,
.write = allwinner_sid_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.impl.min_access_size = 4,
};
static void allwinner_sid_reset(DeviceState *dev)
{
AwSidState *s = AW_SID(dev);
/* Set default values for registers */
s->control = 0;
s->rdkey = 0;
}
static void allwinner_sid_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
AwSidState *s = AW_SID(obj);
/* Memory mapping */
memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_sid_ops, s,
TYPE_AW_SID, 1 * KiB);
sysbus_init_mmio(sbd, &s->iomem);
}
static const Property allwinner_sid_properties[] = {
DEFINE_PROP_UUID_NODEFAULT("identifier", AwSidState, identifier),
};
static const VMStateDescription allwinner_sid_vmstate = {
.name = "allwinner-sid",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(control, AwSidState),
VMSTATE_UINT32(rdkey, AwSidState),
VMSTATE_UINT8_ARRAY_V(identifier.data, AwSidState, sizeof(QemuUUID), 1),
VMSTATE_END_OF_LIST()
}
};
static void allwinner_sid_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_legacy_reset(dc, allwinner_sid_reset);
dc->vmsd = &allwinner_sid_vmstate;
device_class_set_props(dc, allwinner_sid_properties);
}
static const TypeInfo allwinner_sid_info = {
.name = TYPE_AW_SID,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_init = allwinner_sid_init,
.instance_size = sizeof(AwSidState),
.class_init = allwinner_sid_class_init,
};
static void allwinner_sid_register(void)
{
type_register_static(&allwinner_sid_info);
}
type_init(allwinner_sid_register)
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