#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/reset.h>
#include <media/mipi-csi2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mc.h>
#include <media/v4l2-subdev.h>
#define DW_MIPI_CSI2RX_N_LANES 0x04
#define DW_MIPI_CSI2RX_RESETN 0x10
#define DW_MIPI_CSI2RX_PHY_STATE 0x14
#define DW_MIPI_CSI2RX_ERR1 0x20
#define DW_MIPI_CSI2RX_ERR2 0x24
#define DW_MIPI_CSI2RX_MSK1 0x28
#define DW_MIPI_CSI2RX_MSK2 0x2c
#define DW_MIPI_CSI2RX_CONTROL 0x40
#define SW_CPHY_EN(x) ((x) << 0)
#define SW_DSI_EN(x) ((x) << 4)
#define SW_DATATYPE_FS(x) ((x) << 8)
#define SW_DATATYPE_FE(x) ((x) << 14)
#define SW_DATATYPE_LS(x) ((x) << 20)
#define SW_DATATYPE_LE(x) ((x) << 26)
#define DW_MIPI_CSI2RX_CLKS_MAX 1
enum {
DW_MIPI_CSI2RX_PAD_SINK,
DW_MIPI_CSI2RX_PAD_SRC,
DW_MIPI_CSI2RX_PAD_MAX,
};
struct dw_mipi_csi2rx_format {
u32 code;
u8 depth;
u8 csi_dt;
};
struct dw_mipi_csi2rx_device {
struct device *dev;
void __iomem *base_addr;
struct clk_bulk_data *clks;
unsigned int clks_num;
struct phy *phy;
struct reset_control *reset;
const struct dw_mipi_csi2rx_format *formats;
unsigned int formats_num;
struct media_pad pads[DW_MIPI_CSI2RX_PAD_MAX];
struct v4l2_async_notifier notifier;
struct v4l2_subdev sd;
enum v4l2_mbus_type bus_type;
u32 lanes_num;
};
static const struct v4l2_mbus_framefmt default_format = {
.width = 3840,
.height = 2160,
.code = MEDIA_BUS_FMT_SRGGB10_1X10,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_RAW,
.ycbcr_enc = V4L2_YCBCR_ENC_601,
.quantization = V4L2_QUANTIZATION_FULL_RANGE,
.xfer_func = V4L2_XFER_FUNC_NONE,
};
static const struct dw_mipi_csi2rx_format formats[] = {
{
.code = MEDIA_BUS_FMT_YUYV8_1X16,
.depth = 16,
.csi_dt = MIPI_CSI2_DT_YUV422_8B,
},
{
.code = MEDIA_BUS_FMT_UYVY8_1X16,
.depth = 16,
.csi_dt = MIPI_CSI2_DT_YUV422_8B,
},
{
.code = MEDIA_BUS_FMT_YVYU8_1X16,
.depth = 16,
.csi_dt = MIPI_CSI2_DT_YUV422_8B,
},
{
.code = MEDIA_BUS_FMT_VYUY8_1X16,
.depth = 16,
.csi_dt = MIPI_CSI2_DT_YUV422_8B,
},
{
.code = MEDIA_BUS_FMT_RGB888_1X24,
.depth = 24,
.csi_dt = MIPI_CSI2_DT_RGB888,
},
{
.code = MEDIA_BUS_FMT_BGR888_1X24,
.depth = 24,
.csi_dt = MIPI_CSI2_DT_RGB888,
},
{
.code = MEDIA_BUS_FMT_SBGGR8_1X8,
.depth = 8,
.csi_dt = MIPI_CSI2_DT_RAW8,
},
{
.code = MEDIA_BUS_FMT_SGBRG8_1X8,
.depth = 8,
.csi_dt = MIPI_CSI2_DT_RAW8,
},
{
.code = MEDIA_BUS_FMT_SGRBG8_1X8,
.depth = 8,
.csi_dt = MIPI_CSI2_DT_RAW8,
},
{
.code = MEDIA_BUS_FMT_SRGGB8_1X8,
.depth = 8,
.csi_dt = MIPI_CSI2_DT_RAW8,
},
{
.code = MEDIA_BUS_FMT_SBGGR10_1X10,
.depth = 10,
.csi_dt = MIPI_CSI2_DT_RAW10,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_1X10,
.depth = 10,
.csi_dt = MIPI_CSI2_DT_RAW10,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_1X10,
.depth = 10,
.csi_dt = MIPI_CSI2_DT_RAW10,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_1X10,
.depth = 10,
.csi_dt = MIPI_CSI2_DT_RAW10,
},
{
.code = MEDIA_BUS_FMT_SBGGR12_1X12,
.depth = 12,
.csi_dt = MIPI_CSI2_DT_RAW12,
},
{
.code = MEDIA_BUS_FMT_SGBRG12_1X12,
.depth = 12,
.csi_dt = MIPI_CSI2_DT_RAW12,
},
{
.code = MEDIA_BUS_FMT_SGRBG12_1X12,
.depth = 12,
.csi_dt = MIPI_CSI2_DT_RAW12,
},
{
.code = MEDIA_BUS_FMT_SRGGB12_1X12,
.depth = 12,
.csi_dt = MIPI_CSI2_DT_RAW12,
},
};
static inline struct dw_mipi_csi2rx_device *to_csi2(struct v4l2_subdev *sd)
{
return container_of(sd, struct dw_mipi_csi2rx_device, sd);
}
static inline void dw_mipi_csi2rx_write(struct dw_mipi_csi2rx_device *csi2,
unsigned int addr, u32 val)
{
writel(val, csi2->base_addr + addr);
}
static inline u32 dw_mipi_csi2rx_read(struct dw_mipi_csi2rx_device *csi2,
unsigned int addr)
{
return readl(csi2->base_addr + addr);
}
static const struct dw_mipi_csi2rx_format *
dw_mipi_csi2rx_find_format(struct dw_mipi_csi2rx_device *csi2, u32 mbus_code)
{
WARN_ON(csi2->formats_num == 0);
for (unsigned int i = 0; i < csi2->formats_num; i++) {
const struct dw_mipi_csi2rx_format *format = &csi2->formats[i];
if (format->code == mbus_code)
return format;
}
return NULL;
}
static int dw_mipi_csi2rx_start(struct dw_mipi_csi2rx_device *csi2)
{
struct media_pad *source_pad;
union phy_configure_opts opts;
u32 lanes = csi2->lanes_num;
u32 control = 0;
s64 link_freq;
int ret;
if (lanes < 1 || lanes > 4)
return -EINVAL;
source_pad = media_pad_remote_pad_unique(
&csi2->pads[DW_MIPI_CSI2RX_PAD_SINK]);
if (IS_ERR(source_pad))
return PTR_ERR(source_pad);
link_freq = v4l2_get_link_freq(source_pad, 0, 0);
if (link_freq < 0)
return link_freq;
switch (csi2->bus_type) {
case V4L2_MBUS_CSI2_DPHY:
ret = phy_mipi_dphy_get_default_config_for_hsclk(link_freq * 2,
lanes, &opts.mipi_dphy);
if (ret)
return ret;
ret = phy_set_mode(csi2->phy, PHY_MODE_MIPI_DPHY);
if (ret)
return ret;
ret = phy_configure(csi2->phy, &opts);
if (ret)
return ret;
control |= SW_CPHY_EN(0);
break;
case V4L2_MBUS_CSI2_CPHY:
return -EOPNOTSUPP;
default:
return -EINVAL;
}
control |= SW_DATATYPE_FS(0x00) | SW_DATATYPE_FE(0x01) |
SW_DATATYPE_LS(0x02) | SW_DATATYPE_LE(0x03);
dw_mipi_csi2rx_write(csi2, DW_MIPI_CSI2RX_N_LANES, lanes - 1);
dw_mipi_csi2rx_write(csi2, DW_MIPI_CSI2RX_CONTROL, control);
dw_mipi_csi2rx_write(csi2, DW_MIPI_CSI2RX_RESETN, 1);
return phy_power_on(csi2->phy);
}
static void dw_mipi_csi2rx_stop(struct dw_mipi_csi2rx_device *csi2)
{
phy_power_off(csi2->phy);
dw_mipi_csi2rx_write(csi2, DW_MIPI_CSI2RX_RESETN, 0);
dw_mipi_csi2rx_write(csi2, DW_MIPI_CSI2RX_MSK1, ~0);
dw_mipi_csi2rx_write(csi2, DW_MIPI_CSI2RX_MSK2, ~0);
}
static const struct media_entity_operations dw_mipi_csi2rx_media_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static int
dw_mipi_csi2rx_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
struct dw_mipi_csi2rx_device *csi2 = to_csi2(sd);
switch (code->pad) {
case DW_MIPI_CSI2RX_PAD_SRC:
if (code->index)
return -EINVAL;
code->code =
v4l2_subdev_state_get_format(sd_state,
DW_MIPI_CSI2RX_PAD_SINK)->code;
return 0;
case DW_MIPI_CSI2RX_PAD_SINK:
if (code->index >= csi2->formats_num)
return -EINVAL;
code->code = csi2->formats[code->index].code;
return 0;
default:
return -EINVAL;
}
}
static int dw_mipi_csi2rx_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct dw_mipi_csi2rx_device *csi2 = to_csi2(sd);
const struct dw_mipi_csi2rx_format *fmt;
struct v4l2_mbus_framefmt *sink, *src;
if (format->pad == DW_MIPI_CSI2RX_PAD_SRC)
return v4l2_subdev_get_fmt(sd, state, format);
sink = v4l2_subdev_state_get_format(state, format->pad, format->stream);
if (!sink)
return -EINVAL;
fmt = dw_mipi_csi2rx_find_format(csi2, format->format.code);
if (!fmt)
format->format = default_format;
*sink = format->format;
src = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
format->stream);
if (!src)
return -EINVAL;
*src = *sink;
return 0;
}
static int dw_mipi_csi2rx_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
enum v4l2_subdev_format_whence which,
struct v4l2_subdev_krouting *routing)
{
int ret;
ret = v4l2_subdev_routing_validate(sd, routing,
V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
if (ret)
return ret;
return v4l2_subdev_set_routing_with_fmt(sd, state, routing,
&default_format);
}
static int dw_mipi_csi2rx_enable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
u32 pad, u64 streams_mask)
{
struct dw_mipi_csi2rx_device *csi2 = to_csi2(sd);
struct v4l2_subdev *remote_sd;
struct media_pad *sink_pad, *remote_pad;
struct device *dev = csi2->dev;
u64 mask;
int ret;
sink_pad = &sd->entity.pads[DW_MIPI_CSI2RX_PAD_SINK];
remote_pad = media_pad_remote_pad_first(sink_pad);
remote_sd = media_entity_to_v4l2_subdev(remote_pad->entity);
mask = v4l2_subdev_state_xlate_streams(state, DW_MIPI_CSI2RX_PAD_SINK,
DW_MIPI_CSI2RX_PAD_SRC,
&streams_mask);
ret = pm_runtime_resume_and_get(dev);
if (ret)
goto err;
ret = dw_mipi_csi2rx_start(csi2);
if (ret) {
dev_err(dev, "failed to enable CSI hardware\n");
goto err_pm_runtime_put;
}
ret = v4l2_subdev_enable_streams(remote_sd, remote_pad->index, mask);
if (ret)
goto err_csi_stop;
return 0;
err_csi_stop:
dw_mipi_csi2rx_stop(csi2);
err_pm_runtime_put:
pm_runtime_put(dev);
err:
return ret;
}
static int dw_mipi_csi2rx_disable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
u32 pad, u64 streams_mask)
{
struct dw_mipi_csi2rx_device *csi2 = to_csi2(sd);
struct v4l2_subdev *remote_sd;
struct media_pad *sink_pad, *remote_pad;
struct device *dev = csi2->dev;
u64 mask;
int ret;
sink_pad = &sd->entity.pads[DW_MIPI_CSI2RX_PAD_SINK];
remote_pad = media_pad_remote_pad_first(sink_pad);
remote_sd = media_entity_to_v4l2_subdev(remote_pad->entity);
mask = v4l2_subdev_state_xlate_streams(state, DW_MIPI_CSI2RX_PAD_SINK,
DW_MIPI_CSI2RX_PAD_SRC,
&streams_mask);
ret = v4l2_subdev_disable_streams(remote_sd, remote_pad->index, mask);
dw_mipi_csi2rx_stop(csi2);
pm_runtime_put(dev);
return ret;
}
static const struct v4l2_subdev_pad_ops dw_mipi_csi2rx_pad_ops = {
.enum_mbus_code = dw_mipi_csi2rx_enum_mbus_code,
.get_fmt = v4l2_subdev_get_fmt,
.set_fmt = dw_mipi_csi2rx_set_fmt,
.set_routing = dw_mipi_csi2rx_set_routing,
.enable_streams = dw_mipi_csi2rx_enable_streams,
.disable_streams = dw_mipi_csi2rx_disable_streams,
};
static const struct v4l2_subdev_ops dw_mipi_csi2rx_ops = {
.pad = &dw_mipi_csi2rx_pad_ops,
};
static int dw_mipi_csi2rx_init_state(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
struct v4l2_subdev_route routes[] = {
{
.sink_pad = DW_MIPI_CSI2RX_PAD_SINK,
.sink_stream = 0,
.source_pad = DW_MIPI_CSI2RX_PAD_SRC,
.source_stream = 0,
.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
},
};
struct v4l2_subdev_krouting routing = {
.len_routes = ARRAY_SIZE(routes),
.num_routes = ARRAY_SIZE(routes),
.routes = routes,
};
return v4l2_subdev_set_routing_with_fmt(sd, state, &routing,
&default_format);
}
static const struct v4l2_subdev_internal_ops dw_mipi_csi2rx_internal_ops = {
.init_state = dw_mipi_csi2rx_init_state,
};
static int dw_mipi_csi2rx_notifier_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_connection *asd)
{
struct dw_mipi_csi2rx_device *csi2 =
container_of(notifier, struct dw_mipi_csi2rx_device, notifier);
struct media_pad *sink_pad = &csi2->pads[DW_MIPI_CSI2RX_PAD_SINK];
int ret;
ret = v4l2_create_fwnode_links_to_pad(sd, sink_pad,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_err(csi2->dev, "failed to link source pad of %s\n",
sd->name);
return ret;
}
return 0;
}
static const struct v4l2_async_notifier_operations dw_mipi_csi2rx_notifier_ops = {
.bound = dw_mipi_csi2rx_notifier_bound,
};
static int dw_mipi_csi2rx_register_notifier(struct dw_mipi_csi2rx_device *csi2)
{
struct v4l2_async_connection *asd;
struct v4l2_async_notifier *ntf = &csi2->notifier;
struct v4l2_fwnode_endpoint vep;
struct v4l2_subdev *sd = &csi2->sd;
struct device *dev = csi2->dev;
int ret;
struct fwnode_handle *ep __free(fwnode_handle) =
fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
if (!ep)
return dev_err_probe(dev, -ENODEV, "failed to get endpoint\n");
vep.bus_type = V4L2_MBUS_UNKNOWN;
ret = v4l2_fwnode_endpoint_parse(ep, &vep);
if (ret)
return dev_err_probe(dev, ret, "failed to parse endpoint\n");
if (vep.bus_type != V4L2_MBUS_CSI2_DPHY &&
vep.bus_type != V4L2_MBUS_CSI2_CPHY)
return dev_err_probe(dev, -EINVAL,
"invalid bus type of endpoint\n");
csi2->bus_type = vep.bus_type;
csi2->lanes_num = vep.bus.mipi_csi2.num_data_lanes;
v4l2_async_subdev_nf_init(ntf, sd);
ntf->ops = &dw_mipi_csi2rx_notifier_ops;
asd = v4l2_async_nf_add_fwnode_remote(ntf, ep,
struct v4l2_async_connection);
if (IS_ERR(asd)) {
ret = PTR_ERR(asd);
goto err_nf_cleanup;
}
ret = v4l2_async_nf_register(ntf);
if (ret) {
ret = dev_err_probe(dev, ret, "failed to register notifier\n");
goto err_nf_cleanup;
}
return 0;
err_nf_cleanup:
v4l2_async_nf_cleanup(ntf);
return ret;
}
static int dw_mipi_csi2rx_register(struct dw_mipi_csi2rx_device *csi2)
{
struct media_pad *pads = csi2->pads;
struct v4l2_subdev *sd = &csi2->sd;
int ret;
ret = dw_mipi_csi2rx_register_notifier(csi2);
if (ret)
goto err;
v4l2_subdev_init(sd, &dw_mipi_csi2rx_ops);
sd->dev = csi2->dev;
sd->entity.ops = &dw_mipi_csi2rx_media_ops;
sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
sd->internal_ops = &dw_mipi_csi2rx_internal_ops;
snprintf(sd->name, sizeof(sd->name), "dw-mipi-csi2rx %s",
dev_name(csi2->dev));
pads[DW_MIPI_CSI2RX_PAD_SINK].flags = MEDIA_PAD_FL_SINK |
MEDIA_PAD_FL_MUST_CONNECT;
pads[DW_MIPI_CSI2RX_PAD_SRC].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&sd->entity, DW_MIPI_CSI2RX_PAD_MAX, pads);
if (ret)
goto err_notifier_unregister;
ret = v4l2_subdev_init_finalize(sd);
if (ret)
goto err_entity_cleanup;
ret = v4l2_async_register_subdev(sd);
if (ret) {
dev_err(sd->dev, "failed to register CSI-2 subdev\n");
goto err_subdev_cleanup;
}
return 0;
err_subdev_cleanup:
v4l2_subdev_cleanup(sd);
err_entity_cleanup:
media_entity_cleanup(&sd->entity);
err_notifier_unregister:
v4l2_async_nf_unregister(&csi2->notifier);
v4l2_async_nf_cleanup(&csi2->notifier);
err:
return ret;
}
static void dw_mipi_csi2rx_unregister(struct dw_mipi_csi2rx_device *csi2)
{
struct v4l2_subdev *sd = &csi2->sd;
v4l2_async_unregister_subdev(sd);
v4l2_subdev_cleanup(sd);
media_entity_cleanup(&sd->entity);
v4l2_async_nf_unregister(&csi2->notifier);
v4l2_async_nf_cleanup(&csi2->notifier);
}
static const struct of_device_id dw_mipi_csi2rx_of_match[] = {
{
.compatible = "rockchip,rk3568-mipi-csi2",
},
{}
};
MODULE_DEVICE_TABLE(of, dw_mipi_csi2rx_of_match);
static int dw_mipi_csi2rx_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_mipi_csi2rx_device *csi2;
int ret;
csi2 = devm_kzalloc(dev, sizeof(*csi2), GFP_KERNEL);
if (!csi2)
return -ENOMEM;
csi2->dev = dev;
dev_set_drvdata(dev, csi2);
csi2->base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(csi2->base_addr))
return PTR_ERR(csi2->base_addr);
ret = devm_clk_bulk_get_all(dev, &csi2->clks);
if (ret != DW_MIPI_CSI2RX_CLKS_MAX)
return dev_err_probe(dev, -ENODEV, "failed to get clocks\n");
csi2->clks_num = ret;
csi2->phy = devm_phy_get(dev, NULL);
if (IS_ERR(csi2->phy))
return dev_err_probe(dev, PTR_ERR(csi2->phy),
"failed to get MIPI CSI-2 PHY\n");
csi2->reset = devm_reset_control_get_exclusive(dev, NULL);
if (IS_ERR(csi2->reset))
return dev_err_probe(dev, PTR_ERR(csi2->reset),
"failed to get reset\n");
csi2->formats = formats;
csi2->formats_num = ARRAY_SIZE(formats);
ret = devm_pm_runtime_enable(dev);
if (ret)
return dev_err_probe(dev, ret, "failed to enable pm runtime\n");
ret = phy_init(csi2->phy);
if (ret)
return dev_err_probe(dev, ret,
"failed to initialize MIPI CSI-2 PHY\n");
ret = dw_mipi_csi2rx_register(csi2);
if (ret)
goto err_phy_exit;
return 0;
err_phy_exit:
phy_exit(csi2->phy);
return ret;
}
static void dw_mipi_csi2rx_remove(struct platform_device *pdev)
{
struct dw_mipi_csi2rx_device *csi2 = platform_get_drvdata(pdev);
dw_mipi_csi2rx_unregister(csi2);
phy_exit(csi2->phy);
}
static int dw_mipi_csi2rx_runtime_suspend(struct device *dev)
{
struct dw_mipi_csi2rx_device *csi2 = dev_get_drvdata(dev);
clk_bulk_disable_unprepare(csi2->clks_num, csi2->clks);
return 0;
}
static int dw_mipi_csi2rx_runtime_resume(struct device *dev)
{
struct dw_mipi_csi2rx_device *csi2 = dev_get_drvdata(dev);
int ret;
reset_control_assert(csi2->reset);
udelay(5);
reset_control_deassert(csi2->reset);
ret = clk_bulk_prepare_enable(csi2->clks_num, csi2->clks);
if (ret) {
dev_err(dev, "failed to enable clocks\n");
return ret;
}
return 0;
}
static DEFINE_RUNTIME_DEV_PM_OPS(dw_mipi_csi2rx_pm_ops,
dw_mipi_csi2rx_runtime_suspend,
dw_mipi_csi2rx_runtime_resume, NULL);
static struct platform_driver dw_mipi_csi2rx_drv = {
.driver = {
.name = "dw-mipi-csi2rx",
.of_match_table = dw_mipi_csi2rx_of_match,
.pm = pm_ptr(&dw_mipi_csi2rx_pm_ops),
},
.probe = dw_mipi_csi2rx_probe,
.remove = dw_mipi_csi2rx_remove,
};
module_platform_driver(dw_mipi_csi2rx_drv);
MODULE_DESCRIPTION("Synopsys DesignWare MIPI CSI-2 Receiver platform driver");
MODULE_LICENSE("GPL");
