1 files changed, 335 insertions, 0 deletions

diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
new file mode 100644
index 000000000..280efd2a8
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Renesas RZ/G2L CRU
+ *
+ * Copyright (C) 2022 Renesas Electronics Corp.
+ *
+ * Based on Renesas R-Car VIN
+ * Copyright (C) 2011-2013 Renesas Solutions Corp.
+ * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
+ * Copyright (C) 2008 Magnus Damm
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+
+#include "rzg2l-cru.h"
+
+static inline struct rzg2l_cru_dev *notifier_to_cru(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct rzg2l_cru_dev, notifier);
+}
+
+static const struct media_device_ops rzg2l_cru_media_ops = {
+	.link_notify = v4l2_pipeline_link_notify,
+};
+
+/* -----------------------------------------------------------------------------
+ * Group async notifier
+ */
+
+static int rzg2l_cru_group_notify_complete(struct v4l2_async_notifier *notifier)
+{
+	struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
+	struct media_entity *source, *sink;
+	int ret;
+
+	ret = rzg2l_cru_ip_subdev_register(cru);
+	if (ret)
+		return ret;
+
+	ret = v4l2_device_register_subdev_nodes(&cru->v4l2_dev);
+	if (ret) {
+		dev_err(cru->dev, "Failed to register subdev nodes\n");
+		return ret;
+	}
+
+	ret = rzg2l_cru_video_register(cru);
+	if (ret)
+		return ret;
+
+	/*
+	 * CRU can be connected either to CSI2 or PARALLEL device
+	 * For now we are only supporting CSI2
+	 *
+	 * Create media device link between CSI-2 <-> CRU IP
+	 */
+	source = &cru->csi.subdev->entity;
+	sink = &cru->ip.subdev.entity;
+	ret = media_create_pad_link(source, 1, sink, 0,
+				    MEDIA_LNK_FL_ENABLED |
+				    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret) {
+		dev_err(cru->dev, "Error creating link from %s to %s\n",
+			source->name, sink->name);
+		return ret;
+	}
+	cru->csi.channel = 0;
+	cru->ip.remote = cru->csi.subdev;
+
+	/* Create media device link between CRU IP <-> CRU OUTPUT */
+	source = &cru->ip.subdev.entity;
+	sink = &cru->vdev.entity;
+	ret = media_create_pad_link(source, 1, sink, 0,
+				    MEDIA_LNK_FL_ENABLED |
+				    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret) {
+		dev_err(cru->dev, "Error creating link from %s to %s\n",
+			source->name, sink->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void rzg2l_cru_group_notify_unbind(struct v4l2_async_notifier *notifier,
+					  struct v4l2_subdev *subdev,
+					  struct v4l2_async_connection *asd)
+{
+	struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
+
+	rzg2l_cru_ip_subdev_unregister(cru);
+
+	mutex_lock(&cru->mdev_lock);
+
+	if (cru->csi.asd == asd) {
+		cru->csi.subdev = NULL;
+		dev_dbg(cru->dev, "Unbind CSI-2 %s\n", subdev->name);
+	}
+
+	mutex_unlock(&cru->mdev_lock);
+}
+
+static int rzg2l_cru_group_notify_bound(struct v4l2_async_notifier *notifier,
+					struct v4l2_subdev *subdev,
+					struct v4l2_async_connection *asd)
+{
+	struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
+
+	mutex_lock(&cru->mdev_lock);
+
+	if (cru->csi.asd == asd) {
+		cru->csi.subdev = subdev;
+		dev_dbg(cru->dev, "Bound CSI-2 %s\n", subdev->name);
+	}
+
+	mutex_unlock(&cru->mdev_lock);
+
+	return 0;
+}
+
+static const struct v4l2_async_notifier_operations rzg2l_cru_async_ops = {
+	.bound = rzg2l_cru_group_notify_bound,
+	.unbind = rzg2l_cru_group_notify_unbind,
+	.complete = rzg2l_cru_group_notify_complete,
+};
+
+static int rzg2l_cru_mc_parse_of(struct rzg2l_cru_dev *cru)
+{
+	struct v4l2_fwnode_endpoint vep = {
+		.bus_type = V4L2_MBUS_CSI2_DPHY,
+	};
+	struct fwnode_handle *ep, *fwnode;
+	struct v4l2_async_connection *asd;
+	int ret;
+
+	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(cru->dev), 1, 0, 0);
+	if (!ep)
+		return 0;
+
+	fwnode = fwnode_graph_get_remote_endpoint(ep);
+	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
+	fwnode_handle_put(ep);
+	if (ret) {
+		dev_err(cru->dev, "Failed to parse %pOF\n", to_of_node(fwnode));
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (!of_device_is_available(to_of_node(fwnode))) {
+		dev_dbg(cru->dev, "OF device %pOF disabled, ignoring\n",
+			to_of_node(fwnode));
+		ret = -ENOTCONN;
+		goto out;
+	}
+
+	asd = v4l2_async_nf_add_fwnode(&cru->notifier, fwnode,
+				       struct v4l2_async_connection);
+	if (IS_ERR(asd)) {
+		ret = PTR_ERR(asd);
+		goto out;
+	}
+
+	cru->csi.asd = asd;
+
+	dev_dbg(cru->dev, "Added OF device %pOF to slot %u\n",
+		to_of_node(fwnode), vep.base.id);
+out:
+	fwnode_handle_put(fwnode);
+
+	return ret;
+}
+
+static int rzg2l_cru_mc_parse_of_graph(struct rzg2l_cru_dev *cru)
+{
+	int ret;
+
+	v4l2_async_nf_init(&cru->notifier, &cru->v4l2_dev);
+
+	ret = rzg2l_cru_mc_parse_of(cru);
+	if (ret)
+		return ret;
+
+	cru->notifier.ops = &rzg2l_cru_async_ops;
+
+	if (list_empty(&cru->notifier.waiting_list))
+		return 0;
+
+	ret = v4l2_async_nf_register(&cru->notifier);
+	if (ret < 0) {
+		dev_err(cru->dev, "Notifier registration failed\n");
+		v4l2_async_nf_cleanup(&cru->notifier);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rzg2l_cru_media_init(struct rzg2l_cru_dev *cru)
+{
+	struct media_device *mdev = NULL;
+	const struct of_device_id *match;
+	int ret;
+
+	cru->pad.flags = MEDIA_PAD_FL_SINK;
+	ret = media_entity_pads_init(&cru->vdev.entity, 1, &cru->pad);
+	if (ret)
+		return ret;
+
+	mutex_init(&cru->mdev_lock);
+	mdev = &cru->mdev;
+	mdev->dev = cru->dev;
+	mdev->ops = &rzg2l_cru_media_ops;
+
+	match = of_match_node(cru->dev->driver->of_match_table,
+			      cru->dev->of_node);
+
+	strscpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
+	strscpy(mdev->model, match->compatible, sizeof(mdev->model));
+
+	cru->v4l2_dev.mdev = &cru->mdev;
+
+	media_device_init(mdev);
+
+	ret = rzg2l_cru_mc_parse_of_graph(cru);
+	if (ret) {
+		mutex_lock(&cru->mdev_lock);
+		cru->v4l2_dev.mdev = NULL;
+		mutex_unlock(&cru->mdev_lock);
+	}
+
+	return 0;
+}
+
+static int rzg2l_cru_probe(struct platform_device *pdev)
+{
+	struct rzg2l_cru_dev *cru;
+	int ret;
+
+	cru = devm_kzalloc(&pdev->dev, sizeof(*cru), GFP_KERNEL);
+	if (!cru)
+		return -ENOMEM;
+
+	cru->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(cru->base))
+		return PTR_ERR(cru->base);
+
+	cru->presetn = devm_reset_control_get_shared(&pdev->dev, "presetn");
+	if (IS_ERR(cru->presetn))
+		return dev_err_probe(&pdev->dev, PTR_ERR(cru->presetn),
+				     "Failed to get cpg presetn\n");
+
+	cru->aresetn = devm_reset_control_get_exclusive(&pdev->dev, "aresetn");
+	if (IS_ERR(cru->aresetn))
+		return dev_err_probe(&pdev->dev, PTR_ERR(cru->aresetn),
+				     "Failed to get cpg aresetn\n");
+
+	cru->vclk = devm_clk_get(&pdev->dev, "video");
+	if (IS_ERR(cru->vclk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(cru->vclk),
+				     "Failed to get video clock\n");
+
+	cru->dev = &pdev->dev;
+	cru->info = of_device_get_match_data(&pdev->dev);
+
+	cru->image_conv_irq = platform_get_irq(pdev, 0);
+	if (cru->image_conv_irq < 0)
+		return cru->image_conv_irq;
+
+	platform_set_drvdata(pdev, cru);
+
+	ret = rzg2l_cru_dma_register(cru);
+	if (ret)
+		return ret;
+
+	cru->num_buf = RZG2L_CRU_HW_BUFFER_DEFAULT;
+	pm_suspend_ignore_children(&pdev->dev, true);
+	pm_runtime_enable(&pdev->dev);
+
+	ret = rzg2l_cru_media_init(cru);
+	if (ret)
+		goto error_dma_unregister;
+
+	return 0;
+
+error_dma_unregister:
+	rzg2l_cru_dma_unregister(cru);
+	pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static void rzg2l_cru_remove(struct platform_device *pdev)
+{
+	struct rzg2l_cru_dev *cru = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+
+	v4l2_async_nf_unregister(&cru->notifier);
+	v4l2_async_nf_cleanup(&cru->notifier);
+
+	rzg2l_cru_video_unregister(cru);
+	media_device_cleanup(&cru->mdev);
+	mutex_destroy(&cru->mdev_lock);
+
+	rzg2l_cru_dma_unregister(cru);
+}
+
+static const struct of_device_id rzg2l_cru_of_id_table[] = {
+	{ .compatible = "renesas,rzg2l-cru", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rzg2l_cru_of_id_table);
+
+static struct platform_driver rzg2l_cru_driver = {
+	.driver = {
+		.name = "rzg2l-cru",
+		.of_match_table = rzg2l_cru_of_id_table,
+	},
+	.probe = rzg2l_cru_probe,
+	.remove_new = rzg2l_cru_remove,
+};
+
+module_platform_driver(rzg2l_cru_driver);
+
+MODULE_AUTHOR("Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>");
+MODULE_DESCRIPTION("Renesas RZ/G2L CRU driver");
+MODULE_LICENSE("GPL");