#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/videodev2.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mediabus.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>
#include "sun4i_csi.h"
struct sun4i_csi_traits {
unsigned int channels;
unsigned int max_width;
bool has_isp;
};
static int sun4i_csi_video_link_validate(struct media_link *link)
{
dev_warn_once(link->graph_obj.mdev->dev,
"Driver bug: link validation not implemented\n");
return 0;
}
static const struct media_entity_operations sun4i_csi_video_entity_ops = {
.link_validate = sun4i_csi_video_link_validate,
};
static const struct media_entity_operations sun4i_csi_subdev_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *subdev,
struct v4l2_async_connection *asd)
{
struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
notifier);
csi->src_subdev = subdev;
csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
subdev->fwnode,
MEDIA_PAD_FL_SOURCE);
if (csi->src_pad < 0) {
dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
subdev->name);
return csi->src_pad;
}
dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
return 0;
}
static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier)
{
struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
notifier);
struct v4l2_subdev *subdev = &csi->subdev;
struct video_device *vdev = &csi->vdev;
int ret;
ret = v4l2_device_register_subdev(&csi->v4l, subdev);
if (ret < 0)
return ret;
ret = sun4i_csi_v4l2_register(csi);
if (ret < 0)
return ret;
ret = media_device_register(&csi->mdev);
if (ret)
return ret;
ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE,
&vdev->entity, 0,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret)
goto err_clean_media;
ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
&subdev->entity, CSI_SUBDEV_SINK,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret)
goto err_clean_media;
ret = v4l2_device_register_subdev_nodes(&csi->v4l);
if (ret < 0)
goto err_clean_media;
return 0;
err_clean_media:
media_device_unregister(&csi->mdev);
return ret;
}
static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = {
.bound = sun4i_csi_notify_bound,
.complete = sun4i_csi_notify_complete,
};
static int sun4i_csi_notifier_init(struct sun4i_csi *csi)
{
struct v4l2_fwnode_endpoint vep = {
.bus_type = V4L2_MBUS_PARALLEL,
};
struct v4l2_async_connection *asd;
struct fwnode_handle *ep;
int ret;
v4l2_async_nf_init(&csi->notifier, &csi->v4l);
ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi->dev), 0, 0,
FWNODE_GRAPH_ENDPOINT_NEXT);
if (!ep)
return -EINVAL;
ret = v4l2_fwnode_endpoint_parse(ep, &vep);
if (ret)
goto out;
csi->bus = vep.bus.parallel;
asd = v4l2_async_nf_add_fwnode_remote(&csi->notifier, ep,
struct v4l2_async_connection);
if (IS_ERR(asd)) {
ret = PTR_ERR(asd);
goto out;
}
csi->notifier.ops = &sun4i_csi_notify_ops;
out:
fwnode_handle_put(ep);
return ret;
}
static int sun4i_csi_probe(struct platform_device *pdev)
{
struct v4l2_subdev *subdev;
struct video_device *vdev;
struct sun4i_csi *csi;
int ret;
int irq;
csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
if (!csi)
return -ENOMEM;
platform_set_drvdata(pdev, csi);
csi->dev = &pdev->dev;
subdev = &csi->subdev;
vdev = &csi->vdev;
csi->traits = of_device_get_match_data(&pdev->dev);
if (!csi->traits)
return -EINVAL;
csi->mdev.dev = csi->dev;
strscpy(csi->mdev.model, "Allwinner Video Capture Device",
sizeof(csi->mdev.model));
csi->mdev.hw_revision = 0;
media_device_init(&csi->mdev);
csi->v4l.mdev = &csi->mdev;
csi->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(csi->regs))
return PTR_ERR(csi->regs);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
csi->bus_clk = devm_clk_get(&pdev->dev, "bus");
if (IS_ERR(csi->bus_clk)) {
dev_err(&pdev->dev, "Couldn't get our bus clock\n");
return PTR_ERR(csi->bus_clk);
}
if (csi->traits->has_isp) {
csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
if (IS_ERR(csi->isp_clk)) {
dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
return PTR_ERR(csi->isp_clk);
}
}
csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
if (IS_ERR(csi->ram_clk)) {
dev_err(&pdev->dev, "Couldn't get our ram clock\n");
return PTR_ERR(csi->ram_clk);
}
csi->rst = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(csi->rst)) {
dev_err(&pdev->dev, "Couldn't get our reset line\n");
return PTR_ERR(csi->rst);
}
v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops);
subdev->internal_ops = &sun4i_csi_subdev_internal_ops;
subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
subdev->entity.ops = &sun4i_csi_subdev_entity_ops;
subdev->owner = THIS_MODULE;
snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0");
v4l2_set_subdevdata(subdev, csi);
csi->subdev_pads[CSI_SUBDEV_SINK].flags =
MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS,
csi->subdev_pads);
if (ret < 0)
return ret;
csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
vdev->entity.ops = &sun4i_csi_video_entity_ops;
ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad);
if (ret < 0)
return ret;
ret = sun4i_csi_dma_register(csi, irq);
if (ret)
goto err_clean_pad;
ret = sun4i_csi_notifier_init(csi);
if (ret)
goto err_unregister_media;
ret = v4l2_async_nf_register(&csi->notifier);
if (ret) {
dev_err(csi->dev, "Couldn't register our notifier.\n");
goto err_unregister_media;
}
pm_runtime_enable(&pdev->dev);
return 0;
err_unregister_media:
media_device_unregister(&csi->mdev);
sun4i_csi_dma_unregister(csi);
err_clean_pad:
media_device_cleanup(&csi->mdev);
return ret;
}
static void sun4i_csi_remove(struct platform_device *pdev)
{
struct sun4i_csi *csi = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
v4l2_async_nf_unregister(&csi->notifier);
v4l2_async_nf_cleanup(&csi->notifier);
vb2_video_unregister_device(&csi->vdev);
media_device_unregister(&csi->mdev);
sun4i_csi_dma_unregister(csi);
media_device_cleanup(&csi->mdev);
}
static const struct sun4i_csi_traits sun4i_a10_csi1_traits = {
.channels = 1,
.max_width = 24,
.has_isp = false,
};
static const struct sun4i_csi_traits sun7i_a20_csi0_traits = {
.channels = 4,
.max_width = 16,
.has_isp = true,
};
static const struct of_device_id sun4i_csi_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits },
{ .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits },
{ }
};
MODULE_DEVICE_TABLE(of, sun4i_csi_of_match);
static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev)
{
struct sun4i_csi *csi = dev_get_drvdata(dev);
reset_control_deassert(csi->rst);
clk_prepare_enable(csi->bus_clk);
clk_prepare_enable(csi->ram_clk);
clk_set_rate(csi->isp_clk, 80000000);
clk_prepare_enable(csi->isp_clk);
writel(1, csi->regs + CSI_EN_REG);
return 0;
}
static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev)
{
struct sun4i_csi *csi = dev_get_drvdata(dev);
clk_disable_unprepare(csi->isp_clk);
clk_disable_unprepare(csi->ram_clk);
clk_disable_unprepare(csi->bus_clk);
reset_control_assert(csi->rst);
return 0;
}
static const struct dev_pm_ops sun4i_csi_pm_ops = {
SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend,
sun4i_csi_runtime_resume,
NULL)
};
static struct platform_driver sun4i_csi_driver = {
.probe = sun4i_csi_probe,
.remove = sun4i_csi_remove,
.driver = {
.name = "sun4i-csi",
.of_match_table = sun4i_csi_of_match,
.pm = &sun4i_csi_pm_ops,
},
};
module_platform_driver(sun4i_csi_driver);
MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver");
MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
MODULE_LICENSE("GPL");
