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introduce dpcd module

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This introduces dpcd module.
It wires on a aux-bus and can be accessed by the driver to get lane-speed, etc.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Tested-By: Hyun Kwon <hyun.kwon@xilinx.com>
Message-id: 1465833014-21982-6-git-send-email-fred.konrad@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
KONRAD Frederic 2016-06-14 15:59:15 +01:00 committed by Peter Maydell
parent 6fc7f77fd2
commit e27ed1bdd3
4 changed files with 280 additions and 0 deletions
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1
default-configs/aarch64-softmmu.mak
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@ -4,4 +4,5 @@
include arm-softmmu.mak include arm-softmmu.mak
CONFIG_AUX=y CONFIG_AUX=y
CONFIG_DPCD=y
CONFIG_XLNX_ZYNQMP=y CONFIG_XLNX_ZYNQMP=y

1
hw/display/Makefile.objs
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@ -43,3 +43,4 @@ virtio-gpu.o-cflags := $(VIRGL_CFLAGS)
virtio-gpu.o-libs += $(VIRGL_LIBS) virtio-gpu.o-libs += $(VIRGL_LIBS)
virtio-gpu-3d.o-cflags := $(VIRGL_CFLAGS) virtio-gpu-3d.o-cflags := $(VIRGL_CFLAGS)
virtio-gpu-3d.o-libs += $(VIRGL_LIBS) virtio-gpu-3d.o-libs += $(VIRGL_LIBS)
obj-$(CONFIG_DPCD) += dpcd.o

173
hw/display/dpcd.c Normal file
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@ -0,0 +1,173 @@
/*
* 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)

105
include/hw/display/dpcd.h Normal file
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@ -0,0 +1,105 @@
/*
* dpcd.h
*
* 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/>.
*
*/
#ifndef DPCD_H
#define DPCD_H
typedef struct DPCDState DPCDState;
#define TYPE_DPCD "dpcd"
#define DPCD(obj) OBJECT_CHECK(DPCDState, (obj), TYPE_DPCD)
/* DCPD Revision. */
#define DPCD_REVISION 0x00
#define DPCD_REV_1_0 0x10
#define DPCD_REV_1_1 0x11
/* DCPD Max Link Rate. */
#define DPCD_MAX_LINK_RATE 0x01
#define DPCD_1_62GBPS 0x06
#define DPCD_2_7GBPS 0x0A
#define DPCD_5_4GBPS 0x14
#define DPCD_MAX_LANE_COUNT 0x02
#define DPCD_ONE_LANE 0x01
#define DPCD_TWO_LANES 0x02
#define DPCD_FOUR_LANES 0x04
/* DCPD Max down spread. */
#define DPCD_UP_TO_0_5 0x01
#define DPCD_NO_AUX_HANDSHAKE_LINK_TRAINING 0x40
/* DCPD Downstream port type. */
#define DPCD_DISPLAY_PORT 0x00
#define DPCD_ANALOG 0x02
#define DPCD_DVI_HDMI 0x04
#define DPCD_OTHER 0x06
/* DPCD Format conversion. */
#define DPCD_FORMAT_CONVERSION 0x08
/* Main link channel coding. */
#define DPCD_ANSI_8B_10B 0x01
/* Down stream port count. */
#define DPCD_OUI_SUPPORTED 0x80
/* Receiver port capability. */
#define DPCD_RECEIVE_PORT0_CAP_0 0x08
#define DPCD_RECEIVE_PORT0_CAP_1 0x09
#define DPCD_EDID_PRESENT 0x02
#define DPCD_ASSOCIATED_TO_PRECEDING_PORT 0x04
/* Down stream port capability. */
#define DPCD_CAP_DISPLAY_PORT 0x000
#define DPCD_CAP_ANALOG_VGA 0x001
#define DPCD_CAP_DVI 0x002
#define DPCD_CAP_HDMI 0x003
#define DPCD_CAP_OTHER 0x100
#define DPCD_LANE0_1_STATUS 0x202
#define DPCD_LANE0_CR_DONE (1 << 0)
#define DPCD_LANE0_CHANNEL_EQ_DONE (1 << 1)
#define DPCD_LANE0_SYMBOL_LOCKED (1 << 2)
#define DPCD_LANE1_CR_DONE (1 << 4)
#define DPCD_LANE1_CHANNEL_EQ_DONE (1 << 5)
#define DPCD_LANE1_SYMBOL_LOCKED (1 << 6)
#define DPCD_LANE2_3_STATUS 0x203
#define DPCD_LANE2_CR_DONE (1 << 0)
#define DPCD_LANE2_CHANNEL_EQ_DONE (1 << 1)
#define DPCD_LANE2_SYMBOL_LOCKED (1 << 2)
#define DPCD_LANE3_CR_DONE (1 << 4)
#define DPCD_LANE3_CHANNEL_EQ_DONE (1 << 5)
#define DPCD_LANE3_SYMBOL_LOCKED (1 << 6)
#define DPCD_LANE_ALIGN_STATUS_UPDATED 0x204
#define DPCD_INTERLANE_ALIGN_DONE 0x01
#define DPCD_DOWNSTREAM_PORT_STATUS_CHANGED 0x40
#define DPCD_LINK_STATUS_UPDATED 0x80
#define DPCD_SINK_STATUS 0x205
#define DPCD_RECEIVE_PORT_0_STATUS 0x01
#endif /* !DPCD_H */