From: KONRAD Frederic <fred.kon...@greensocs.com> This introduces a DPCD module. It wires on a aux-bus and can be accessed by driver to get lane-speed, etc.
Signed-off-by: KONRAD Frederic <fred.kon...@greensocs.com> --- default-configs/aarch64-softmmu.mak | 1 + hw/display/Makefile.objs | 1 + hw/display/dpcd.c | 157 ++++++++++++++++++++++++++++++++++++ hw/display/dpcd.h | 94 +++++++++++++++++++++ 4 files changed, 253 insertions(+) create mode 100644 hw/display/dpcd.c create mode 100644 hw/display/dpcd.h diff --git a/default-configs/aarch64-softmmu.mak b/default-configs/aarch64-softmmu.mak index d3a2665..87165b7 100644 --- a/default-configs/aarch64-softmmu.mak +++ b/default-configs/aarch64-softmmu.mak @@ -4,4 +4,5 @@ include arm-softmmu.mak CONFIG_AUX=y +CONFIG_DPCD=y CONFIG_XLNX_ZYNQMP=y diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs index dd8ea76..6d7004a 100644 --- a/hw/display/Makefile.objs +++ b/hw/display/Makefile.objs @@ -38,3 +38,4 @@ common-obj-$(CONFIG_QXL) += qxl.o qxl-logger.o qxl-render.o obj-$(CONFIG_VIRTIO) += virtio-gpu.o obj-$(CONFIG_VIRTIO_PCI) += virtio-gpu-pci.o obj-$(CONFIG_VIRTIO_VGA) += virtio-vga.o +obj-$(CONFIG_DPCD) += dpcd.o diff --git a/hw/display/dpcd.c b/hw/display/dpcd.c new file mode 100644 index 0000000..cf666f8 --- /dev/null +++ b/hw/display/dpcd.c @@ -0,0 +1,157 @@ +/* + * dpcd.c + * + * Copyright (C) 2015 : GreenSocs Ltd + * http://www.greensocs.com/ , email: i...@greensocs.com + * + * Developed by : + * Frederic Konrad <fred.kon...@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 "hw/aux.h" +#include "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 { + 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; + } +} + +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_ONE_LANE; + 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; + + 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) diff --git a/hw/display/dpcd.h b/hw/display/dpcd.h new file mode 100644 index 0000000..8951557 --- /dev/null +++ b/hw/display/dpcd.h @@ -0,0 +1,94 @@ +/* + * dpcd.h + * + * Copyright (C)2015 : GreenSocs Ltd + * http://www.greensocs.com/ , email: i...@greensocs.com + * + * Developed by : + * Frederic Konrad <fred.kon...@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 0x01 +#define DPCD_LANE0_CHANNEL_EQ_DONE 0x02 +#define DPCD_LANE0_SYMBOL_LOCKED 0x04 + +#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 */ -- 1.9.0
