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psee-streamer.c
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psee-streamer.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Prophesee Generic driver for streaming IPs
*
* This driver provides minimal functionality for Prophesee streaming blocks:
* - Streaming its input to its output un-altered
* - Clear any internal memory between to streamings
* - Propagate media format information
*
* Copyright (C) Prophesee S.A.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <media/v4l2-async.h>
#include <media/v4l2-subdev.h>
#define PAD_SINK 0
#define PAD_SOURCE 1
#define REG_VERSION (0x0)
#define REG_CONTROL (0x4)
#define BIT_ENABLE BIT(0)
#define BIT_BYPASS BIT(1)
#define BIT_CLEAR BIT(2)
/**
* struct psee_streamer - Prophesee generic structure of a streaming IP
* @subdev: V4L2 subdev
* @pads: media pads
* @formats: V4L2 media bus formats
* @dev: (OF) device
* @iomem: device I/O register space remapped to kernel virtual memory
* @clk: video core clock
*/
struct psee_streamer {
struct v4l2_subdev subdev;
struct media_pad pads[2];
struct v4l2_mbus_framefmt formats[2];
struct device *dev;
void __iomem *iomem;
resource_size_t iosize;
struct clk *clk;
};
static inline struct psee_streamer *to_streamer(struct v4l2_subdev *subdev)
{
return container_of(subdev, struct psee_streamer, subdev);
}
/*
* Register related operations
*/
static inline u32 read_reg(struct psee_streamer *streamer, u32 addr)
{
return ioread32(streamer->iomem + addr);
}
static inline void write_reg(struct psee_streamer *streamer, u32 addr, u32 value)
{
iowrite32(value, streamer->iomem + addr);
}
/*
* V4L2 Subdevice Video Operations
*/
static int s_stream(struct v4l2_subdev *subdev, int enable)
{
struct psee_streamer *streamer = to_streamer(subdev);
u32 control = read_reg(streamer, REG_CONTROL);
if (!enable) {
control &= ~BIT_ENABLE;
control |= BIT_CLEAR;
} else {
control &= ~BIT_CLEAR;
control |= BIT_ENABLE;
}
write_reg(streamer, REG_CONTROL, control);
return 0;
}
/*
* V4L2 Subdevice Pad Operations
*/
static struct v4l2_mbus_framefmt *
__get_pad_format(struct psee_streamer *streamer, struct v4l2_subdev_state *sd_state,
unsigned int pad, u32 which)
{
struct v4l2_mbus_framefmt *format;
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
format = v4l2_subdev_get_try_format(&streamer->subdev, sd_state, pad);
break;
case V4L2_SUBDEV_FORMAT_ACTIVE:
format = &streamer->formats[pad];
break;
default:
format = NULL;
break;
}
return format;
}
static int enum_mbus_code(struct v4l2_subdev *subdev, struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
struct v4l2_mbus_framefmt *format;
if (code->index)
return -EINVAL;
format = v4l2_subdev_get_try_format(subdev, sd_state, code->pad);
code->code = format->code;
return 0;
}
static int get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct psee_streamer *streamer = to_streamer(subdev);
struct v4l2_mbus_framefmt *format;
format = __get_pad_format(streamer, sd_state, fmt->pad, fmt->which);
if (!format)
return -EINVAL;
fmt->format = *format;
return 0;
}
static int set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct psee_streamer *streamer = to_streamer(subdev);
struct v4l2_mbus_framefmt *format;
format = __get_pad_format(streamer, sd_state, fmt->pad, fmt->which);
if (!format)
return -EINVAL;
if (fmt->pad == PAD_SINK) {
/* Save the new format */
*format = fmt->format;
/* If the IP is not in bypass, someone tempered it, let that someone deal with the
* format setting and propagation
*/
if (read_reg(streamer, REG_CONTROL) & BIT_BYPASS)
return 0;
/* Propagate the format to the source pad */
format = __get_pad_format(streamer, sd_state, PAD_SOURCE, fmt->which);
*format = fmt->format;
} else if ((read_reg(streamer, REG_CONTROL) & BIT_BYPASS)) {
/* pad is SOURCE and IP is in bypass */
struct v4l2_mbus_framefmt *input_format;
input_format = __get_pad_format(streamer, sd_state, PAD_SINK, fmt->which);
/* in passthrough, output is always the same as input */
*format = *input_format;
/* Let the userspace know about it */
fmt->format = *input_format;
} else {
/* Someone with root powers changed the IP configuration, don't try to guess the
* actual output and let the root user deal with the settings
*/
*format = fmt->format;
}
return 0;
}
/*
* V4L2 Subdevice Operations
*/
static int log_status(struct v4l2_subdev *sd)
{
struct psee_streamer *streamer = to_streamer(sd);
struct device *dev = streamer->dev;
u32 control = read_reg(streamer, REG_CONTROL);
dev_info(dev, "***** Passthrough driver *****\n");
dev_info(dev, "Version = 0x%x\n", read_reg(streamer, REG_VERSION));
dev_info(dev, "Control = %s %s %s(0x%x)\n",
control & BIT_ENABLE ? "ENABLED" : "DISABLED",
control & BIT_BYPASS ? "BYPASSED" : "ENGAGED",
control & BIT_CLEAR ? "CLEARING " : "",
control);
dev_info(dev, "I/O space = 0x%llx\n", streamer->iosize);
return 0;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
struct psee_streamer *streamer = to_streamer(sd);
/* check if the address is aligned */
if (reg->reg & 3ul)
return -EINVAL;
/* check if the provided address is in the mapped space */
if (reg->reg >= streamer->iosize)
return -EINVAL;
reg->size = 4;
reg->val = read_reg(streamer, reg->reg);
return 0;
}
static int s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
{
struct psee_streamer *streamer = to_streamer(sd);
/* check if the address is aligned */
if (reg->reg & 3ul)
return -EINVAL;
/* check if the provided address is in the mapped space */
if (reg->reg >= streamer->iosize)
return -EINVAL;
write_reg(streamer, reg->reg, reg->val);
return 0;
}
#endif
static const struct v4l2_subdev_core_ops core_ops = {
.log_status = log_status,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.g_register = g_register,
.s_register = s_register,
#endif
};
static const struct v4l2_subdev_video_ops video_ops = {
.s_stream = s_stream,
};
static const struct v4l2_subdev_pad_ops pad_ops = {
.enum_mbus_code = enum_mbus_code,
.get_fmt = get_format,
.set_fmt = set_format,
.link_validate = v4l2_subdev_link_validate_default,
};
static const struct v4l2_subdev_ops ops = {
.core = &core_ops,
.video = &video_ops,
.pad = &pad_ops,
};
/*
* Media Operations
*/
static const struct media_entity_operations media_ops = {
.link_validate = v4l2_subdev_link_validate,
};
/*
* Platform Device Driver
*/
static int parse_of(struct psee_streamer *streamer)
{
struct device *dev = streamer->dev;
struct device_node *node = dev->of_node;
struct device_node *ports;
struct device_node *port;
u32 port_id;
int ret;
ports = of_get_child_by_name(node, "ports");
if (ports == NULL)
ports = node;
/* Get the format description for each pad */
for_each_child_of_node(ports, port) {
if (port->name && (of_node_cmp(port->name, "port") == 0)) {
ret = of_property_read_u32(port, "reg", &port_id);
if (ret < 0) {
dev_err(dev, "no reg in DT");
return ret;
}
if (port_id != 0 && port_id != 1) {
dev_err(dev, "invalid reg in DT");
return -EINVAL;
}
}
}
return 0;
}
static int probe(struct platform_device *pdev)
{
struct psee_streamer *streamer;
struct v4l2_subdev *subdev;
struct resource *io_space;
int ret;
streamer = devm_kzalloc(&pdev->dev, sizeof(*streamer), GFP_KERNEL);
if (!streamer)
return -ENOMEM;
streamer->dev = &pdev->dev;
ret = parse_of(streamer);
if (ret < 0)
return ret;
io_space = platform_get_resource(pdev, IORESOURCE_MEM, 0);
streamer->iomem = devm_ioremap_resource(streamer->dev, io_space);
if (IS_ERR(streamer->iomem))
return PTR_ERR(streamer->iomem);
streamer->iosize = resource_size(io_space);
streamer->clk = devm_clk_get(streamer->dev, NULL);
if (IS_ERR(streamer->clk))
return PTR_ERR(streamer->clk);
clk_prepare_enable(streamer->clk);
/* Initialize V4L2 subdevice and media entity */
subdev = &streamer->subdev;
v4l2_subdev_init(subdev, &ops);
/* It may not be the right function, but at least it's pixel in/pixel out */
subdev->entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV;
subdev->dev = &pdev->dev;
strscpy(subdev->name, dev_name(&pdev->dev), sizeof(subdev->name));
v4l2_set_subdevdata(subdev, streamer);
subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
streamer->pads[PAD_SINK].flags = MEDIA_PAD_FL_SINK;
streamer->pads[PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
subdev->entity.ops = &media_ops;
ret = media_entity_pads_init(&subdev->entity, 2, streamer->pads);
if (ret < 0)
goto error;
platform_set_drvdata(pdev, streamer);
ret = v4l2_async_register_subdev(subdev);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register subdev\n");
goto error;
}
return 0;
error:
media_entity_cleanup(&subdev->entity);
clk_disable_unprepare(streamer->clk);
return ret;
}
static int remove(struct platform_device *pdev)
{
struct psee_streamer *streamer = platform_get_drvdata(pdev);
struct v4l2_subdev *subdev = &streamer->subdev;
v4l2_async_unregister_subdev(subdev);
media_entity_cleanup(&subdev->entity);
clk_disable_unprepare(streamer->clk);
return 0;
}
static const struct of_device_id of_id_table[] = {
{ .compatible = "psee,passthrough" },
{ }
};
MODULE_DEVICE_TABLE(of, of_id_table);
static struct platform_driver passthrough_driver = {
.driver = {
.name = "psee-streamer",
.of_match_table = of_id_table,
},
.probe = probe,
.remove = remove,
};
module_platform_driver(passthrough_driver);
MODULE_DESCRIPTION("Prophesee Passthrough Driver");
MODULE_LICENSE("GPL");