/*
* dpcd.c
*
* Copyright (C) 2015 : GreenSocs Ltd
* http://www.greensocs.com/ , email: info@greensocs.com
*
* Developed by :
* Frederic Konrad <fred.konrad@greensocs.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/>.
*
*/
/*
* This is a simple AUX slave which emulates a connected screen.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/misc/aux.h"
#include "hw/display/dpcd.h"
#ifndef DEBUG_DPCD
#define DEBUG_DPCD 0
#endif
#define DPRINTF(fmt, ...) do { \
if (DEBUG_DPCD) { \
qemu_log("dpcd: " fmt, ## __VA_ARGS__); \
} \
} while (0);
#define DPCD_READABLE_AREA 0x600
struct DPCDState {
/*< private >*/
AUXSlave parent_obj;
/*< public >*/
/*
* The DCPD is 0x7FFFF length but read as 0 after offset 0x5FF.
*/
uint8_t dpcd_info[DPCD_READABLE_AREA];
MemoryRegion iomem;
};
static uint64_t dpcd_read(void *opaque, hwaddr offset, unsigned size)
{
uint8_t ret;
DPCDState *e = DPCD(opaque);
if (offset < DPCD_READABLE_AREA) {
ret = e->dpcd_info[offset];
} else {
qemu_log_mask(LOG_GUEST_ERROR, "dpcd: Bad offset 0x%" HWADDR_PRIX "\n",
offset);
ret = 0;
}
DPRINTF("read 0x%" PRIX8 " @0x%" HWADDR_PRIX "\n", ret, offset);
return ret;
}
static void dpcd_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
DPCDState *e = DPCD(opaque);
DPRINTF("write 0x%" PRIX8 " @0x%" HWADDR_PRIX "\n", (uint8_t)value, offset);
if (offset < DPCD_READABLE_AREA) {
e->dpcd_info[offset] = value;
} else {
qemu_log_mask(LOG_GUEST_ERROR, "dpcd: Bad offset 0x%" HWADDR_PRIX "\n",
offset);
}
}
static const MemoryRegionOps aux_ops = {
.read = dpcd_read,
.write = dpcd_write,
.valid = {
.min_access_size = 1,
.max_access_size = 1,
},
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static void dpcd_reset(DeviceState *dev)
{
DPCDState *s = DPCD(dev);
memset(&(s->dpcd_info), 0, sizeof(s->dpcd_info));
s->dpcd_info[DPCD_REVISION] = DPCD_REV_1_0;
s->dpcd_info[DPCD_MAX_LINK_RATE] = DPCD_5_4GBPS;
s->dpcd_info[DPCD_MAX_LANE_COUNT] = DPCD_FOUR_LANES;
s->dpcd_info[DPCD_RECEIVE_PORT0_CAP_0] = DPCD_EDID_PRESENT;
/* buffer size */
s->dpcd_info[DPCD_RECEIVE_PORT0_CAP_1] = 0xFF;
s->dpcd_info[DPCD_LANE0_1_STATUS] = DPCD_LANE0_CR_DONE
| DPCD_LANE0_CHANNEL_EQ_DONE
| DPCD_LANE0_SYMBOL_LOCKED
| DPCD_LANE1_CR_DONE
| DPCD_LANE1_CHANNEL_EQ_DONE
| DPCD_LANE1_SYMBOL_LOCKED;
s->dpcd_info[DPCD_LANE2_3_STATUS] = DPCD_LANE2_CR_DONE
| DPCD_LANE2_CHANNEL_EQ_DONE
| DPCD_LANE2_SYMBOL_LOCKED
| DPCD_LANE3_CR_DONE
| DPCD_LANE3_CHANNEL_EQ_DONE
| DPCD_LANE3_SYMBOL_LOCKED;
s->dpcd_info[DPCD_LANE_ALIGN_STATUS_UPDATED] = DPCD_INTERLANE_ALIGN_DONE;
s->dpcd_info[DPCD_SINK_STATUS] = DPCD_RECEIVE_PORT_0_STATUS;
}
static void dpcd_init(Object *obj)
{
DPCDState *s = DPCD(obj);
memory_region_init_io(&s->iomem, obj, &aux_ops, s, TYPE_DPCD, 0x7FFFF);
aux_init_mmio(AUX_SLAVE(obj), &s->iomem);
}
static const VMStateDescription vmstate_dpcd = {
.name = TYPE_DPCD,
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT8_ARRAY_V(dpcd_info, DPCDState, DPCD_READABLE_AREA, 0),
VMSTATE_END_OF_LIST()
}
};
static void dpcd_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->reset = dpcd_reset;
dc->vmsd = &vmstate_dpcd;
}
static const TypeInfo dpcd_info = {
.name = TYPE_DPCD,
.parent = TYPE_AUX_SLAVE,
.instance_size = sizeof(DPCDState),
.class_init = dpcd_class_init,
.instance_init = dpcd_init,
};
static void dpcd_register_types(void)
{
type_register_static(&dpcd_info);
}
type_init(dpcd_register_types)
