[RFC PATCH v2 3/4] media: platform: Add CRU driver for RZ/G2L SoC

From: Lad Prabhakar
Date: Thu Jan 20 2022 - 20:06:26 EST

Add v4l driver for Renesas RZ/G2L Camera data Receiving Unit.

Based on a patch in the BSP by Hien Huynh
<hien.huynh.px@xxxxxxxxxxx>

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
v1->v2
* Dropped group
* Dropped CSI subdev and implemented as new driver
* Dropped "mc_" from function names
* Moved the driver to renesas folder
---
drivers/media/platform/Kconfig | 1 +
drivers/media/platform/Makefile | 2 +
.../media/platform/renesas/rzg2l-cru/Kconfig | 15 +
.../media/platform/renesas/rzg2l-cru/Makefile | 4 +
.../platform/renesas/rzg2l-cru/rzg2l-core.c | 432 +++++++++++
.../platform/renesas/rzg2l-cru/rzg2l-cru.h | 155 ++++
.../platform/renesas/rzg2l-cru/rzg2l-dma.c | 722 ++++++++++++++++++
.../platform/renesas/rzg2l-cru/rzg2l-v4l2.c | 360 +++++++++
8 files changed, 1691 insertions(+)
create mode 100644 drivers/media/platform/renesas/rzg2l-cru/Kconfig
create mode 100644 drivers/media/platform/renesas/rzg2l-cru/Makefile
create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c
create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index cf4adc64c953..4251c5686c2a 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -169,6 +169,7 @@ source "drivers/media/platform/exynos4-is/Kconfig"
source "drivers/media/platform/am437x/Kconfig"
source "drivers/media/platform/xilinx/Kconfig"
source "drivers/media/platform/rcar-vin/Kconfig"
+source "drivers/media/platform/renesas/rzg2l-cru/Kconfig"
source "drivers/media/platform/atmel/Kconfig"
source "drivers/media/platform/sunxi/Kconfig"

diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index a148553babfc..021d30a2c66c 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -66,6 +66,8 @@ obj-$(CONFIG_VIDEO_XILINX) += xilinx/
obj-$(CONFIG_VIDEO_RCAR_ISP) += rcar-isp.o
obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin/

+obj-$(CONFIG_VIDEO_RZG2L_CRU) += renesas/rzg2l-cru/
+
obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel/
obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel/
obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel/
diff --git a/drivers/media/platform/renesas/rzg2l-cru/Kconfig b/drivers/media/platform/renesas/rzg2l-cru/Kconfig
new file mode 100644
index 000000000000..310baa4d4c14
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config VIDEO_RZG2L_CRU
+ tristate "RZ/G2L Camera Receiving Unit (CRU) Driver"
+ depends on VIDEO_V4L2 && OF
+ depends on ARCH_RENESAS || COMPILE_TEST
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select VIDEOBUF2_DMA_CONTIG
+ select V4L2_FWNODE
+ help
+ Support for Renesas RZ/G2L Camera Receiving Unit (CRU) driver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called rzg2l-cru.
diff --git a/drivers/media/platform/renesas/rzg2l-cru/Makefile b/drivers/media/platform/renesas/rzg2l-cru/Makefile
new file mode 100644
index 000000000000..8c307075f131
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+rzg2l-cru-objs = rzg2l-core.o rzg2l-dma.o rzg2l-v4l2.o
+
+obj-$(CONFIG_VIDEO_RZG2L_CRU) += rzg2l-cru.o
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 000000000000..881bedaaff8f
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
@@ -0,0 +1,432 @@
+// 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@xxxxxxxxxxxxxxxxxx>
+ * Copyright (C) 2008 Magnus Damm
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+
+#include "rzg2l-cru.h"
+
+#define v4l2_dev_to_cru(d) container_of(d, struct rzg2l_cru_dev, v4l2_dev)
+
+static int rzg2l_cru_csi2_link_notify(struct media_link *link, u32 flags,
+ unsigned int notification)
+{
+ struct media_entity *entity;
+ struct rzg2l_cru_dev *cru;
+ struct video_device *vdev;
+ struct media_pad *csi_pad;
+ struct v4l2_subdev *sd;
+ int ret;
+
+ ret = v4l2_pipeline_link_notify(link, flags, notification);
+ if (ret)
+ return ret;
+
+ /* Only care about link enablement for CRU nodes. */
+ if (!(flags & MEDIA_LNK_FL_ENABLED) ||
+ !is_media_entity_v4l2_video_device(link->sink->entity))
+ return 0;
+
+ cru = container_of(link->graph_obj.mdev, struct rzg2l_cru_dev, mdev);
+ /*
+ * Don't allow link changes if any entity in the graph is
+ * streaming, modifying the CHSEL register fields can disrupt
+ * running streams.
+ */
+ media_device_for_each_entity(entity, &cru->mdev)
+ if (entity->pads->stream_count)
+ return -EBUSY;
+
+ mutex_lock(&cru->mdev_lock);
+ vdev = media_entity_to_video_device(link->sink->entity);
+
+ csi_pad = media_entity_remote_pad(&cru->vdev.entity.pads[0]);
+ if (csi_pad) {
+ ret = -EMLINK;
+ goto out;
+ }
+
+ sd = media_entity_to_v4l2_subdev(link->source->entity);
+ if (cru->csi.subdev == sd) {
+ cru->csi.channel = link->source->index - 1;
+ cru->is_csi = true;
+ } else {
+ ret = -ENODEV;
+ }
+
+out:
+ mutex_unlock(&cru->mdev_lock);
+
+ return ret;
+}
+
+static const struct media_device_ops rzg2l_cru_media_ops = {
+ .link_notify = rzg2l_cru_csi2_link_notify,
+};
+
+static void rzg2l_cru_put(struct rzg2l_cru_dev *cru)
+{
+ mutex_lock(&cru->mdev_lock);
+ cru->v4l2_dev.mdev = NULL;
+ mutex_unlock(&cru->mdev_lock);
+}
+
+/* -----------------------------------------------------------------------------
+ * Group async notifier
+ */
+
+static int rzg2l_cru_group_notify_complete(struct v4l2_async_notifier *notifier)
+{
+ struct rzg2l_cru_dev *cru = v4l2_dev_to_cru(notifier->v4l2_dev);
+ unsigned int i;
+ int ret;
+
+ ret = media_device_register(&cru->mdev);
+ 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;
+ }
+
+ if (!video_is_registered(&cru->vdev)) {
+ ret = rzg2l_cru_v4l2_register(cru);
+ if (ret)
+ return ret;
+ }
+
+ /* Create all media device links between CRU and CSI-2's. */
+ for (i = 1; i <= CSI2_VCHANNEL; i++) {
+ struct media_entity *source, *sink;
+
+ source = &cru->csi.subdev->entity;
+ sink = &cru->vdev.entity;
+
+ ret = media_create_pad_link(source, i, sink, 0, 0);
+ if (ret) {
+ dev_err(cru->dev, "Error adding link from %s to %s\n",
+ source->name, sink->name);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void rzg2l_cru_group_notify_unbind(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct rzg2l_cru_dev *cru = v4l2_dev_to_cru(notifier->v4l2_dev);
+
+ rzg2l_cru_v4l2_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);
+
+ media_device_unregister(&cru->mdev);
+}
+
+static int rzg2l_cru_group_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct rzg2l_cru_dev *cru = v4l2_dev_to_cru(notifier->v4l2_dev);
+ unsigned int i;
+
+ mutex_lock(&cru->mdev_lock);
+
+ if (cru->csi.asd == asd) {
+ cru->csi.subdev = subdev;
+ dev_dbg(cru->dev, "Bound CSI-2 %s to slot %u\n", subdev->name, i);
+ }
+
+ 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 rvin_mc_parse_of(struct rzg2l_cru_dev *cru, unsigned int id)
+{
+ struct v4l2_fwnode_endpoint vep = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY,
+ };
+ struct fwnode_handle *ep, *fwnode;
+ struct v4l2_async_subdev *asd;
+ int ret;
+
+ ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(cru->dev), 1, id, 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_subdev);
+ 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);
+
+ ret = rvin_mc_parse_of(cru, 0);
+ if (ret)
+ return ret;
+
+ cru->notifier.ops = &rzg2l_cru_async_ops;
+
+ if (list_empty(&cru->notifier.asd_list))
+ return 0;
+
+ ret = v4l2_async_nf_register(&cru->v4l2_dev, &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_csi2_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));
+ snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
+ dev_name(mdev->dev));
+
+ cru->v4l2_dev.mdev = &cru->mdev;
+
+ media_device_init(mdev);
+
+ ret = rzg2l_cru_mc_parse_of_graph(cru);
+ if (ret)
+ rzg2l_cru_put(cru);
+
+ return 0;
+}
+
+static int rzg2l_cru_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct rzg2l_cru_dev *cru = container_of(ctrl->handler,
+ struct rzg2l_cru_dev,
+ ctrl_handler);
+ int ret = 0;
+
+ switch (ctrl->id) {
+ case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
+ if (cru->state == RZG2L_CRU_DMA_STOPPED ||
+ cru->state == RZG2L_CRU_DMA_STOPPING)
+ cru->num_buf = ctrl->val;
+ else
+ ret = -EBUSY;
+
+ break;
+ }
+
+ return ret;
+}
+
+static const struct v4l2_ctrl_ops rzg2l_cru_ctrl_ops = {
+ .s_ctrl = rzg2l_cru_s_ctrl,
+};
+
+static int rzg2l_cru_probe(struct platform_device *pdev)
+{
+ struct rzg2l_cru_dev *cru;
+ struct v4l2_ctrl *ctrl;
+ int irq, 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(&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(&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->dev = &pdev->dev;
+ cru->info = of_device_get_match_data(&pdev->dev);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ ret = rzg2l_cru_dma_register(cru, irq);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, cru);
+
+ ret = rzg2l_cru_csi2_init(cru);
+ if (ret)
+ goto error_dma_unregister;
+
+ v4l2_ctrl_handler_init(&cru->ctrl_handler, 1);
+ ctrl = v4l2_ctrl_new_std(&cru->ctrl_handler, &rzg2l_cru_ctrl_ops,
+ V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
+ 1, HW_BUFFER_MAX, 1, HW_BUFFER_DEFAULT);
+ if (cru->ctrl_handler.error) {
+ dev_err(&pdev->dev, "%s: control initialization error %d\n",
+ __func__, cru->ctrl_handler.error);
+ ret = cru->ctrl_handler.error;
+ goto free_ctrl;
+ }
+
+ ctrl->flags &= ~V4L2_CTRL_FLAG_READ_ONLY;
+ cru->v4l2_dev.ctrl_handler = &cru->ctrl_handler;
+
+ cru->num_buf = HW_BUFFER_DEFAULT;
+
+ pm_suspend_ignore_children(&pdev->dev, true);
+ pm_runtime_enable(&pdev->dev);
+
+ return 0;
+
+free_ctrl:
+ v4l2_ctrl_handler_free(&cru->ctrl_handler);
+error_dma_unregister:
+ rzg2l_cru_dma_unregister(cru);
+
+ return ret;
+}
+
+static const struct rzg2l_cru_info rzg2l_cru_info_generic = {
+ .max_width = 2800,
+ .max_height = 4096,
+};
+
+static const struct of_device_id rzg2l_cru_of_id_table[] = {
+ {
+ .compatible = "renesas,rzg2l-cru",
+ .data = &rzg2l_cru_info_generic,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rzg2l_cru_of_id_table);
+
+static int rzg2l_cru_remove(struct platform_device *pdev)
+{
+ struct rzg2l_cru_dev *cru = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(&pdev->dev);
+
+ rzg2l_cru_v4l2_unregister(cru);
+
+ v4l2_async_nf_unregister(&cru->notifier);
+ v4l2_async_nf_cleanup(&cru->notifier);
+
+ media_device_cleanup(&cru->mdev);
+ mutex_destroy(&cru->mdev_lock);
+ cru->v4l2_dev.mdev = NULL;
+
+ v4l2_ctrl_handler_free(&cru->ctrl_handler);
+ cru->vdev.ctrl_handler = NULL;
+
+ rzg2l_cru_dma_unregister(cru);
+
+ return 0;
+}
+
+static struct platform_driver rzg2l_cru_driver = {
+ .driver = {
+ .name = "rzg2l-cru",
+ .of_match_table = rzg2l_cru_of_id_table,
+ },
+ .probe = rzg2l_cru_probe,
+ .remove = rzg2l_cru_remove,
+};
+
+module_platform_driver(rzg2l_cru_driver);
+
+MODULE_DESCRIPTION("Renesas RZ/G2L CRU driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
new file mode 100644
index 000000000000..91a28279846e
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
@@ -0,0 +1,155 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Driver for Renesas RZ/G2L CRU
+ *
+ * Copyright (C) 2022 Renesas Electronics Corp.
+ *
+ */
+
+#ifndef __RZG2L_CRU__
+#define __RZG2L_CRU__
+
+#include <linux/clk.h>
+#include <linux/reset.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/videobuf2-v4l2.h>
+
+/* Number of HW buffers */
+#define HW_BUFFER_MAX 8
+#define HW_BUFFER_DEFAULT 3
+
+/* Address alignment mask for HW buffers */
+#define HW_BUFFER_MASK 0x1ff
+
+/* Maximum number of CSI2 virtual channels */
+#define CSI2_VCHANNEL 4
+
+/**
+ * enum rzg2l_cru_dma_state - DMA states
+ * @RZG2L_CRU_DMA_STOPPED: No operation in progress
+ * @RZG2L_CRU_DMA_STARTING: Capture starting up
+ * @RZG2L_CRU_DMA_RUNNING: Operation in progress have buffers
+ * @RZG2L_CRU_DMA_STOPPING: Stopping operation
+ */
+enum rzg2l_cru_dma_state {
+ RZG2L_CRU_DMA_STOPPED = 0,
+ RZG2L_CRU_DMA_STARTING,
+ RZG2L_CRU_DMA_RUNNING,
+ RZG2L_CRU_DMA_STOPPING,
+};
+
+/**
+ * struct rzg2l_cru_info - Information about the particular CRU implementation
+ * @max_width: max input width the CRU supports
+ * @max_height: max input height the CRU supports
+ */
+struct rzg2l_cru_info {
+ unsigned int max_width;
+ unsigned int max_height;
+};
+
+struct rzg2l_cru_csi {
+ struct v4l2_async_subdev *asd;
+ struct v4l2_subdev *subdev;
+ u32 channel;
+};
+
+/**
+ * struct rzg2l_cru_dev - Renesas CRU device structure
+ * @dev: (OF) device
+ * @base: device I/O register space remapped to virtual memory
+ * @info: info about CRU instance
+ *
+ * @presetn: CRU_PRESETN reset line
+ * @aresetn: CRU_ARESETN reset line
+ *
+ * @vdev: V4L2 video device associated with CRU
+ * @v4l2_dev: V4L2 device
+ * @ctrl_handler: V4L2 control handler
+ * @num_buf: Holds the current number of buffers enabled
+ * @notifier: V4L2 asynchronous subdevs notifier
+ *
+ * @csi: CSI info
+ * @mdev: media device
+ * @mdev_lock: protects the count, notifier and csi members
+ * @pad: media pad for the video device entity
+ *
+ * @lock: protects @queue
+ * @queue: vb2 buffers queue
+ * @scratch: cpu address for scratch buffer
+ * @scratch_phys: physical address of the scratch buffer
+ *
+ * @qlock: protects @queue_buf, @buf_list, @sequence
+ * @state
+ * @queue_buf: Keeps track of buffers given to HW slot
+ * @buf_list: list of queued buffers
+ * @sequence: V4L2 buffers sequence number
+ * @state: keeps track of operation state
+ *
+ * @is_csi: flag to mark the CRU as using a CSI-2 subdevice
+ *
+ * @input_is_yuv: flag to mark the input format of CRU
+ * @output_is_yuv: flag to mark the output format of CRU
+ *
+ * @mbus_code: media bus format code
+ * @format: active V4L2 pixel format
+ *
+ * @compose: active composing
+ * @source: active size of the video source
+ * @std: active video standard of the video source
+ */
+struct rzg2l_cru_dev {
+ struct device *dev;
+ void __iomem *base;
+ const struct rzg2l_cru_info *info;
+
+ struct reset_control *presetn;
+ struct reset_control *aresetn;
+
+ struct video_device vdev;
+ struct v4l2_device v4l2_dev;
+ struct v4l2_ctrl_handler ctrl_handler;
+ u8 num_buf;
+
+ struct v4l2_async_notifier notifier;
+
+ struct rzg2l_cru_csi csi;
+ struct media_device mdev;
+ struct mutex mdev_lock;
+ struct media_pad pad;
+
+ struct mutex lock;
+ struct vb2_queue queue;
+ void *scratch;
+ dma_addr_t scratch_phys;
+
+ spinlock_t qlock;
+ struct vb2_v4l2_buffer *queue_buf[HW_BUFFER_MAX];
+ struct list_head buf_list;
+ unsigned int sequence;
+ enum rzg2l_cru_dma_state state;
+
+ bool is_csi;
+
+ bool input_is_yuv;
+ bool output_is_yuv;
+
+ u32 mbus_code;
+ struct v4l2_pix_format format;
+
+ struct v4l2_rect compose;
+};
+
+int rzg2l_cru_dma_register(struct rzg2l_cru_dev *cru, int irq);
+void rzg2l_cru_dma_unregister(struct rzg2l_cru_dev *cru);
+
+int rzg2l_cru_v4l2_register(struct rzg2l_cru_dev *cru);
+void rzg2l_cru_v4l2_unregister(struct rzg2l_cru_dev *cru);
+
+const struct v4l2_format_info *rzg2l_cru_format_from_pixel(u32 format);
+
+#endif
diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c
new file mode 100644
index 000000000000..0fcf4baccca9
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c
@@ -0,0 +1,722 @@
+// 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@xxxxxxxxxxxxxxxxxx>
+ * Copyright (C) 2008 Magnus Damm
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+
+#include <media/videobuf2-dma-contig.h>
+
+#include "rzg2l-cru.h"
+
+/* HW CRU Registers Definition */
+/* CRU Control Register */
+#define CRUnCTRL 0x0
+#define CRUnCTRL_VINSEL(x) ((x) << 0)
+
+/* CRU Interrupt Enable Register */
+#define CRUnIE 0x4
+#define CRUnIE_SFE BIT(16)
+#define CRUnIE_EFE BIT(17)
+
+/* CRU Interrupt Status Register */
+#define CRUnINTS 0x8
+#define CRUnINTS_SFS BIT(16)
+
+/* CRU Reset Register */
+#define CRUnRST 0xc
+#define CRUnRST_VRESETN BIT(0)
+
+/* Memory Bank Base Address (Lower) Register for CRU Image Data */
+#define AMnMBxADDRL(x) (0x100 + ((x) * 8))
+
+/* Memory Bank Base Address (Higher) Register for CRU Image Data */
+#define AMnMBxADDRH(x) (0x104 + ((x) * 8))
+
+/* Memory Bank Enable Register for CRU Image Data */
+#define AMnMBVALID 0x148
+#define AMnMBVALID_MBVALID(x) GENMASK(x, 0)
+
+/* Memory Bank Status Register for CRU Image Data */
+#define AMnMBS 0x14c
+#define AMnMBS_MBSTS 0x7
+
+/* AXI Master FIFO Pointer Register for CRU Image Data */
+#define AMnFIFOPNTR 0x168
+#define AMnFIFOPNTR_FIFOWPNTR GENMASK(7, 0)
+#define AMnFIFOPNTR_FIFORPNTR_Y GENMASK(23, 16)
+
+/* AXI Master Transfer Stop Register for CRU Image Data */
+#define AMnAXISTP 0x174
+#define AMnAXISTP_AXI_STOP BIT(0)
+
+/* AXI Master Transfer Stop Status Register for CRU Image Data */
+#define AMnAXISTPACK 0x178
+#define AMnAXISTPACK_AXI_STOP_ACK BIT(0)
+
+/* CRU Image Processing Enable Register */
+#define ICnEN 0x200
+#define ICnEN_ICEN BIT(0)
+
+/* CRU Image Processing Main Control Register */
+#define ICnMC 0x208
+#define ICnMC_CSCTHR BIT(5)
+#define ICnMC_INF_YUV8_422 (0x1e << 16)
+#define ICnMC_INF_USER (0x30 << 16)
+#define ICnMC_VCSEL(x) ((x) << 22)
+#define ICnMC_INF_MASK GENMASK(21, 16)
+
+/* CRU Module Status Register */
+#define ICnMS 0x254
+#define ICnMS_IA BIT(2)
+
+/* CRU Data Output Mode Register */
+#define ICnDMR 0x26c
+#define ICnDMR_YCMODE_UYVY (1 << 4)
+
+#define RZG2L_TIMEOUT_MS 100
+#define RZG2L_RETRIES 10
+
+struct rzg2l_cru_buffer {
+ struct vb2_v4l2_buffer vb;
+ struct list_head list;
+};
+
+#define to_buf_list(vb2_buffer) (&container_of(vb2_buffer, \
+ struct rzg2l_cru_buffer, \
+ vb)->list)
+
+static void rzg2l_cru_write(struct rzg2l_cru_dev *cru, u32 offset, u32 value)
+{
+ iowrite32(value, cru->base + offset);
+}
+
+static u32 rzg2l_cru_read(struct rzg2l_cru_dev *cru, u32 offset)
+{
+ return ioread32(cru->base + offset);
+}
+
+/* Need to hold qlock before calling */
+static void return_unused_buffers(struct rzg2l_cru_dev *cru,
+ enum vb2_buffer_state state)
+{
+ struct rzg2l_cru_buffer *buf, *node;
+ unsigned long flags;
+ unsigned int i;
+
+ spin_lock_irqsave(&cru->qlock, flags);
+ for (i = 0; i < cru->num_buf; i++) {
+ if (cru->queue_buf[i]) {
+ vb2_buffer_done(&cru->queue_buf[i]->vb2_buf,
+ state);
+ cru->queue_buf[i] = NULL;
+ }
+ }
+
+ list_for_each_entry_safe(buf, node, &cru->buf_list, list) {
+ vb2_buffer_done(&buf->vb.vb2_buf, state);
+ list_del(&buf->list);
+ }
+ spin_unlock_irqrestore(&cru->qlock, flags);
+}
+
+static int rzg2l_cru_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
+ unsigned int *nplanes, unsigned int sizes[],
+ struct device *alloc_devs[])
+{
+ struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq);
+
+ /* Make sure the image size is large enough. */
+ if (*nplanes)
+ return sizes[0] < cru->format.sizeimage ? -EINVAL : 0;
+
+ *nplanes = 1;
+ sizes[0] = cru->format.sizeimage;
+
+ return 0;
+};
+
+static int rzg2l_cru_buffer_prepare(struct vb2_buffer *vb)
+{
+ struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vb->vb2_queue);
+ unsigned long size = cru->format.sizeimage;
+
+ if (vb2_plane_size(vb, 0) < size) {
+ dev_err(cru->dev, "buffer too small (%lu < %lu)\n",
+ vb2_plane_size(vb, 0), size);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(vb, 0, size);
+
+ return 0;
+}
+
+static void rzg2l_cru_buffer_queue(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vb->vb2_queue);
+ unsigned long flags;
+
+ spin_lock_irqsave(&cru->qlock, flags);
+
+ list_add_tail(to_buf_list(vbuf), &cru->buf_list);
+
+ spin_unlock_irqrestore(&cru->qlock, flags);
+}
+
+static int rzg2l_cru_mc_validate_format(struct rzg2l_cru_dev *cru,
+ struct v4l2_subdev *sd,
+ struct media_pad *pad)
+{
+ struct v4l2_subdev_format fmt = {
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+
+ fmt.pad = pad->index;
+ fmt.stream = 0;
+ if (v4l2_subdev_call(sd, pad, get_fmt, v4l2_subdev_get_active_state(sd), &fmt))
+ return -EPIPE;
+
+ if (cru->is_csi) {
+ switch (fmt.format.code) {
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ break;
+ default:
+ return -EPIPE;
+ }
+ }
+ cru->mbus_code = fmt.format.code;
+
+ switch (fmt.format.field) {
+ case V4L2_FIELD_TOP:
+ case V4L2_FIELD_BOTTOM:
+ case V4L2_FIELD_NONE:
+ case V4L2_FIELD_INTERLACED_TB:
+ case V4L2_FIELD_INTERLACED_BT:
+ case V4L2_FIELD_INTERLACED:
+ case V4L2_FIELD_SEQ_TB:
+ case V4L2_FIELD_SEQ_BT:
+ break;
+ default:
+ return -EPIPE;
+ }
+
+ if (fmt.format.width != cru->format.width ||
+ fmt.format.height != cru->format.height ||
+ fmt.format.code != cru->mbus_code)
+ return -EPIPE;
+
+ return 0;
+}
+
+static void rzg2l_cru_set_slot_addr(struct rzg2l_cru_dev *cru,
+ int slot, dma_addr_t addr)
+{
+ const struct v4l2_format_info *fmt;
+ int offsetx, offsety;
+ dma_addr_t offset;
+
+ fmt = rzg2l_cru_format_from_pixel(cru->format.pixelformat);
+
+ /*
+ * There is no HW support for composition do the best we can
+ * by modifying the buffer offset
+ */
+ offsetx = cru->compose.left * fmt->bpp[0];
+ offsety = cru->compose.top * cru->format.bytesperline;
+ offset = addr + offsetx + offsety;
+
+ /*
+ * The address needs to be 512 bytes aligned. Driver should never accept
+ * settings that do not satisfy this in the first place...
+ */
+ if (WARN_ON((offsetx | offsety | offset) & HW_BUFFER_MASK))
+ return;
+
+ /* Currently, we just use the buffer in 32 bits address */
+ rzg2l_cru_write(cru, AMnMBxADDRL(slot), offset);
+ rzg2l_cru_write(cru, AMnMBxADDRH(slot), 0);
+}
+
+/*
+ * Moves a buffer from the queue to the HW slot. If no buffer is
+ * available use the scratch buffer. The scratch buffer is never
+ * returned to userspace, its only function is to enable the capture
+ * loop to keep running.
+ */
+static void rzg2l_cru_fill_hw_slot(struct rzg2l_cru_dev *cru, int slot)
+{
+ struct vb2_v4l2_buffer *vbuf;
+ struct rzg2l_cru_buffer *buf;
+ dma_addr_t phys_addr;
+
+ /* A already populated slot shall never be overwritten. */
+ if (WARN_ON(cru->queue_buf[slot]))
+ return;
+
+ dev_dbg(cru->dev, "Filling HW slot: %d\n", slot);
+
+ if (list_empty(&cru->buf_list)) {
+ cru->queue_buf[slot] = NULL;
+ phys_addr = cru->scratch_phys;
+ } else {
+ /* Keep track of buffer we give to HW */
+ buf = list_entry(cru->buf_list.next,
+ struct rzg2l_cru_buffer, list);
+ vbuf = &buf->vb;
+ list_del_init(to_buf_list(vbuf));
+ cru->queue_buf[slot] = vbuf;
+
+ /* Setup DMA */
+ phys_addr = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0);
+ }
+
+ rzg2l_cru_set_slot_addr(cru, slot, phys_addr);
+}
+
+static void rzg2l_cru_initialize_axi(struct rzg2l_cru_dev *cru)
+{
+ unsigned int slot;
+
+ /*
+ * Set image data memory banks.
+ * Currently, we will use maximum address.
+ */
+ rzg2l_cru_write(cru, AMnMBVALID, AMnMBVALID_MBVALID(cru->num_buf - 1));
+
+ for (slot = 0; slot < cru->num_buf; slot++)
+ rzg2l_cru_fill_hw_slot(cru, slot);
+}
+
+static void rzg2l_cru_csi2_setup(struct rzg2l_cru_dev *cru)
+{
+ u32 icnmc;
+
+ switch (cru->mbus_code) {
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ icnmc = ICnMC_INF_YUV8_422;
+ cru->input_is_yuv = true;
+ break;
+ default:
+ cru->input_is_yuv = false;
+ icnmc = ICnMC_INF_USER;
+ break;
+ }
+
+ icnmc |= (rzg2l_cru_read(cru, ICnMC) & ~ICnMC_INF_MASK);
+
+ /* Set virtual channel CSI2 */
+ icnmc |= ICnMC_VCSEL(cru->csi.channel);
+
+ rzg2l_cru_write(cru, ICnMC, icnmc);
+}
+
+static int rzg2l_cru_initialize_image_conv(struct rzg2l_cru_dev *cru)
+{
+ u32 icndmr;
+
+ if (cru->is_csi)
+ rzg2l_cru_csi2_setup(cru);
+
+ /* Output format */
+ switch (cru->format.pixelformat) {
+ case V4L2_PIX_FMT_UYVY:
+ icndmr = ICnDMR_YCMODE_UYVY;
+ cru->output_is_yuv = true;
+ break;
+ default:
+ dev_err(cru->dev, "Invalid pixelformat (0x%x)\n",
+ cru->format.pixelformat);
+ return -EINVAL;
+ }
+
+ /* If input and output use same colorspace, do bypass mode */
+ if (cru->output_is_yuv == cru->input_is_yuv)
+ rzg2l_cru_write(cru, ICnMC,
+ rzg2l_cru_read(cru, ICnMC) | ICnMC_CSCTHR);
+ else
+ rzg2l_cru_write(cru, ICnMC,
+ rzg2l_cru_read(cru, ICnMC) & (~ICnMC_CSCTHR));
+
+ /* Set output data format */
+ rzg2l_cru_write(cru, ICnDMR, icndmr);
+
+ return 0;
+}
+
+static int rzg2l_cru_set_stream(struct rzg2l_cru_dev *cru, int on)
+{
+ struct media_pipeline *pipe;
+ struct v4l2_subdev *sd;
+ struct media_pad *pad;
+ unsigned long flags;
+ int ret;
+
+ pad = media_entity_remote_pad(&cru->pad);
+ if (!pad)
+ return -EPIPE;
+
+ sd = media_entity_to_v4l2_subdev(pad->entity);
+
+ if (!on) {
+ media_pipeline_stop(cru->vdev.entity.pads);
+ return v4l2_subdev_call(sd, video, s_stream, 0);
+ }
+
+ ret = rzg2l_cru_mc_validate_format(cru, sd, pad);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&cru->qlock, flags);
+
+ /* Select a video input */
+ if (cru->is_csi)
+ rzg2l_cru_write(cru, CRUnCTRL, CRUnCTRL_VINSEL(0));
+
+ /* Cancel the software reset for image processing block */
+ rzg2l_cru_write(cru, CRUnRST, CRUnRST_VRESETN);
+
+ /* Disable and clear the interrupt before using */
+ rzg2l_cru_write(cru, CRUnIE, 0);
+ rzg2l_cru_write(cru, CRUnINTS, 0x001f000f);
+
+ /* Initialize the AXI master */
+ rzg2l_cru_initialize_axi(cru);
+
+ /* Initialize image convert */
+ ret = rzg2l_cru_initialize_image_conv(cru);
+ if (ret) {
+ spin_unlock_irqrestore(&cru->qlock, flags);
+ return ret;
+ }
+
+ /* Enable interrupt */
+ rzg2l_cru_write(cru, CRUnIE, CRUnIE_EFE);
+
+ /* Enable image processing reception */
+ rzg2l_cru_write(cru, ICnEN, ICnEN_ICEN);
+
+ spin_unlock_irqrestore(&cru->qlock, flags);
+
+ pipe = sd->entity.pads->pipe ? sd->entity.pads->pipe : &cru->vdev.pipe;
+ ret = media_pipeline_start(cru->vdev.entity.pads, pipe);
+ if (ret)
+ return ret;
+
+ ret = v4l2_subdev_call(sd, video, s_stream, 1);
+ if (ret == -ENOIOCTLCMD)
+ ret = 0;
+ if (ret)
+ media_pipeline_stop(cru->vdev.entity.pads);
+
+ return ret;
+}
+
+static void rzg2l_cru_stop_streaming(struct rzg2l_cru_dev *cru)
+{
+ u32 amnfifopntr, amnfifopntr_w, amnfifopntr_r_y;
+ unsigned int retries = 0;
+ unsigned long flags;
+ u32 icnms;
+
+ cru->state = RZG2L_CRU_DMA_STOPPING;
+
+ rzg2l_cru_set_stream(cru, 0);
+
+ spin_lock_irqsave(&cru->qlock, flags);
+
+ /* Enable IRQ to detect frame start reception */
+ rzg2l_cru_write(cru, CRUnINTS,
+ (~rzg2l_cru_read(cru, CRUnINTS)) | CRUnINTS_SFS);
+ rzg2l_cru_write(cru, CRUnIE, CRUnIE_SFE);
+
+ /* Wait for streaming to stop */
+ while (retries++ < RZG2L_RETRIES) {
+ spin_unlock_irqrestore(&cru->qlock, flags);
+ msleep(RZG2L_TIMEOUT_MS);
+ spin_lock_irqsave(&cru->qlock, flags);
+ }
+
+ icnms = rzg2l_cru_read(cru, ICnMS) & ICnMS_IA;
+ if (icnms)
+ dev_err(cru->dev, "Failed stop HW, something is seriously broken\n");
+
+ cru->state = RZG2L_CRU_DMA_STOPPED;
+
+ /* Stop the operation of image conversion */
+ rzg2l_cru_write(cru, ICnEN, 0);
+
+ /* Disable and clear the interrupt */
+ rzg2l_cru_write(cru, CRUnIE, 0);
+ rzg2l_cru_write(cru, CRUnINTS, 0x001F0F0F);
+
+ /* Wait until the FIFO becomes empty */
+ for (retries = 5; retries > 0; retries--) {
+ amnfifopntr = rzg2l_cru_read(cru, AMnFIFOPNTR);
+
+ amnfifopntr_w = amnfifopntr & AMnFIFOPNTR_FIFOWPNTR;
+ amnfifopntr_r_y =
+ (amnfifopntr & AMnFIFOPNTR_FIFORPNTR_Y) >> 16;
+ if (amnfifopntr_w == amnfifopntr_r_y)
+ break;
+
+ usleep_range(10, 20);
+ }
+
+ /* Notify that FIFO is not empty here */
+ if (!retries)
+ dev_err(cru->dev, "Failed to empty FIFO\n");
+
+ /* Stop AXI bus */
+ rzg2l_cru_write(cru, AMnAXISTP, AMnAXISTP_AXI_STOP);
+
+ /* Wait until the AXI bus stop */
+ for (retries = 5; retries > 0; retries--) {
+ if (rzg2l_cru_read(cru, AMnAXISTPACK) &
+ AMnAXISTPACK_AXI_STOP_ACK)
+ break;
+
+ usleep_range(10, 20);
+ };
+
+ /* Notify that AXI bus can not stop here */
+ if (!retries)
+ dev_err(cru->dev, "Failed to stop AXI bus\n");
+
+ /* Cancel the AXI bus stop request */
+ rzg2l_cru_write(cru, AMnAXISTP, 0);
+
+ /* Resets the image processing module */
+ rzg2l_cru_write(cru, CRUnRST, 0);
+
+ spin_unlock_irqrestore(&cru->qlock, flags);
+
+ /* Set reset state */
+ reset_control_assert(cru->aresetn);
+}
+
+static int rzg2l_cru_start_streaming_vq(struct vb2_queue *vq, unsigned int count)
+{
+ struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq);
+ int ret;
+
+ /* Release reset state */
+ ret = reset_control_deassert(cru->aresetn);
+ if (ret) {
+ dev_err(cru->dev, "failed to deassert aresetn\n");
+ return ret;
+ }
+
+ /* Allocate scratch buffer. */
+ cru->scratch = dma_alloc_coherent(cru->dev, cru->format.sizeimage,
+ &cru->scratch_phys, GFP_KERNEL);
+ if (!cru->scratch) {
+ return_unused_buffers(cru, VB2_BUF_STATE_QUEUED);
+ dev_err(cru->dev, "Failed to allocate scratch buffer\n");
+ return -ENOMEM;
+ }
+
+ cru->sequence = 0;
+
+ ret = rzg2l_cru_set_stream(cru, 1);
+ if (ret) {
+ return_unused_buffers(cru, VB2_BUF_STATE_QUEUED);
+ goto out;
+ }
+
+ cru->state = RZG2L_CRU_DMA_STARTING;
+
+ dev_dbg(cru->dev, "Starting to capture\n");
+
+out:
+ if (ret)
+ dma_free_coherent(cru->dev, cru->format.sizeimage, cru->scratch,
+ cru->scratch_phys);
+
+ return ret;
+}
+
+static void rzg2l_cru_stop_streaming_vq(struct vb2_queue *vq)
+{
+ struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq);
+
+ rzg2l_cru_stop_streaming(cru);
+
+ /* Free scratch buffer */
+ dma_free_coherent(cru->dev, cru->format.sizeimage, cru->scratch,
+ cru->scratch_phys);
+
+ return_unused_buffers(cru, VB2_BUF_STATE_ERROR);
+}
+
+static const struct vb2_ops rzg2l_cru_qops = {
+ .queue_setup = rzg2l_cru_queue_setup,
+ .buf_prepare = rzg2l_cru_buffer_prepare,
+ .buf_queue = rzg2l_cru_buffer_queue,
+ .start_streaming = rzg2l_cru_start_streaming_vq,
+ .stop_streaming = rzg2l_cru_stop_streaming_vq,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static irqreturn_t rzg2l_cru_irq(int irq, void *data)
+{
+ struct rzg2l_cru_dev *cru = data;
+ unsigned int handled = 0;
+ unsigned long flags;
+ u32 irq_status;
+ u32 amnmbs;
+ int slot;
+
+ spin_lock_irqsave(&cru->qlock, flags);
+
+ irq_status = rzg2l_cru_read(cru, CRUnINTS);
+ if (!irq_status)
+ goto done;
+
+ handled = 1;
+
+ rzg2l_cru_write(cru, CRUnINTS, rzg2l_cru_read(cru, CRUnINTS));
+
+ /* Nothing to do if capture status is 'RZG2L_CRU_DMA_STOPPED' */
+ if (cru->state == RZG2L_CRU_DMA_STOPPED) {
+ dev_dbg(cru->dev, "IRQ while state stopped\n");
+ goto done;
+ }
+
+ /* Increase stop retries if capture status is 'RZG2L_CRU_DMA_STOPPING' */
+ if (cru->state == RZG2L_CRU_DMA_STOPPING) {
+ if (irq_status & CRUnINTS_SFS)
+ dev_dbg(cru->dev, "IRQ while state stopping\n");
+ goto done;
+ }
+
+ /* Prepare for capture and update state */
+ amnmbs = rzg2l_cru_read(cru, AMnMBS);
+ slot = amnmbs & AMnMBS_MBSTS;
+
+ /*
+ * AMnMBS.MBSTS indicates the destination of Memory Bank (MB).
+ * Recalculate to get the current transfer complete MB.
+ */
+ if (slot == 0)
+ slot = cru->num_buf - 1;
+ else
+ slot--;
+
+ /*
+ * To hand buffers back in a known order to userspace start
+ * to capture first from slot 0.
+ */
+ if (cru->state == RZG2L_CRU_DMA_STARTING) {
+ if (slot != 0) {
+ dev_dbg(cru->dev, "Starting sync slot: %d\n", slot);
+ goto done;
+ }
+
+ dev_dbg(cru->dev, "Capture start synced!\n");
+ cru->state = RZG2L_CRU_DMA_RUNNING;
+ }
+
+ /* Capture frame */
+ if (cru->queue_buf[slot]) {
+ cru->queue_buf[slot]->field = cru->format.field;
+ cru->queue_buf[slot]->sequence = cru->sequence;
+ cru->queue_buf[slot]->vb2_buf.timestamp = ktime_get_ns();
+ vb2_buffer_done(&cru->queue_buf[slot]->vb2_buf,
+ VB2_BUF_STATE_DONE);
+ cru->queue_buf[slot] = NULL;
+ } else {
+ /* Scratch buffer was used, dropping frame. */
+ dev_dbg(cru->dev, "Dropping frame %u\n", cru->sequence);
+ }
+
+ cru->sequence++;
+
+ /* Prepare for next frame */
+ rzg2l_cru_fill_hw_slot(cru, slot);
+
+done:
+ spin_unlock_irqrestore(&cru->qlock, flags);
+
+ return IRQ_RETVAL(handled);
+}
+
+void rzg2l_cru_dma_unregister(struct rzg2l_cru_dev *cru)
+{
+ mutex_destroy(&cru->lock);
+
+ v4l2_device_unregister(&cru->v4l2_dev);
+ reset_control_assert(cru->presetn);
+}
+
+int rzg2l_cru_dma_register(struct rzg2l_cru_dev *cru, int irq)
+{
+ struct vb2_queue *q = &cru->queue;
+ unsigned int i;
+ int ret;
+
+ ret = reset_control_deassert(cru->presetn);
+ if (ret) {
+ dev_err(cru->dev, "failed to deassert presetn\n");
+ return ret;
+ }
+
+ /* Initialize the top-level structure */
+ ret = v4l2_device_register(cru->dev, &cru->v4l2_dev);
+ if (ret)
+ return ret;
+
+ mutex_init(&cru->lock);
+ INIT_LIST_HEAD(&cru->buf_list);
+
+ spin_lock_init(&cru->qlock);
+
+ cru->state = RZG2L_CRU_DMA_STOPPED;
+
+ for (i = 0; i < HW_BUFFER_MAX; i++)
+ cru->queue_buf[i] = NULL;
+
+ /* buffer queue */
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
+ q->lock = &cru->lock;
+ q->drv_priv = cru;
+ q->buf_struct_size = sizeof(struct rzg2l_cru_buffer);
+ q->ops = &rzg2l_cru_qops;
+ q->mem_ops = &vb2_dma_contig_memops;
+ q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ q->min_buffers_needed = 4;
+ q->dev = cru->dev;
+
+ ret = vb2_queue_init(q);
+ if (ret < 0) {
+ dev_err(cru->dev, "failed to initialize VB2 queue\n");
+ goto error;
+ }
+
+ /* IRQ */
+ ret = devm_request_irq(cru->dev, irq, rzg2l_cru_irq, IRQF_SHARED,
+ KBUILD_MODNAME, cru);
+ if (ret) {
+ dev_err(cru->dev, "failed to request irq\n");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ rzg2l_cru_dma_unregister(cru);
+ return ret;
+}
diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c
new file mode 100644
index 000000000000..b1b1bfda7eb1
--- /dev/null
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c
@@ -0,0 +1,360 @@
+// 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) 2016 Renesas Electronics Corp.
+ * Copyright (C) 2011-2013 Renesas Solutions Corp.
+ * Copyright (C) 2013 Cogent Embedded, Inc., <source@xxxxxxxxxxxxxxxxxx>
+ * Copyright (C) 2008 Magnus Damm
+ */
+
+#include <linux/pm_runtime.h>
+
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mc.h>
+#include <media/v4l2-rect.h>
+
+#include "rzg2l-cru.h"
+
+#define RZG2L_CRU_DEFAULT_FORMAT V4L2_PIX_FMT_UYVY
+#define RZG2L_CRU_DEFAULT_WIDTH 800
+#define RZG2L_CRU_DEFAULT_HEIGHT 600
+#define RZG2L_CRU_DEFAULT_FIELD V4L2_FIELD_NONE
+#define RZG2L_CRU_DEFAULT_COLORSPACE V4L2_COLORSPACE_SRGB
+
+/* -----------------------------------------------------------------------------
+ * Format Conversions
+ */
+
+static const struct v4l2_format_info rzg2l_cru_formats[] = {
+ {
+ .format = V4L2_PIX_FMT_UYVY,
+ .bpp[0] = 2,
+ },
+};
+
+const struct v4l2_format_info *rzg2l_cru_format_from_pixel(u32 format)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(rzg2l_cru_formats); i++)
+ if (rzg2l_cru_formats[i].format == format)
+ return rzg2l_cru_formats + i;
+
+ return NULL;
+}
+
+static u32 rzg2l_cru_format_bytesperline(struct v4l2_pix_format *pix)
+{
+ const struct v4l2_format_info *fmt;
+
+ fmt = rzg2l_cru_format_from_pixel(pix->pixelformat);
+
+ if (WARN_ON(!fmt))
+ return -EINVAL;
+
+ return pix->width * fmt->bpp[0];
+}
+
+static u32 rzg2l_cru_format_sizeimage(struct v4l2_pix_format *pix)
+{
+ return pix->bytesperline * pix->height;
+}
+
+static void rzg2l_cru_format_align(struct rzg2l_cru_dev *cru,
+ struct v4l2_pix_format *pix)
+{
+ if (!rzg2l_cru_format_from_pixel(pix->pixelformat))
+ pix->pixelformat = RZG2L_CRU_DEFAULT_FORMAT;
+
+ switch (pix->field) {
+ case V4L2_FIELD_TOP:
+ case V4L2_FIELD_BOTTOM:
+ case V4L2_FIELD_NONE:
+ case V4L2_FIELD_INTERLACED_TB:
+ case V4L2_FIELD_INTERLACED_BT:
+ case V4L2_FIELD_INTERLACED:
+ break;
+ default:
+ pix->field = RZG2L_CRU_DEFAULT_FIELD;
+ break;
+ }
+
+ /* Limit to CRU capabilities */
+ v4l_bound_align_image(&pix->width, 320, cru->info->max_width, 1,
+ &pix->height, 240, cru->info->max_height, 2, 0);
+
+ pix->bytesperline = rzg2l_cru_format_bytesperline(pix);
+ pix->sizeimage = rzg2l_cru_format_sizeimage(pix);
+
+ dev_dbg(cru->dev, "Format %ux%u bpl: %u size: %u\n",
+ pix->width, pix->height, pix->bytesperline, pix->sizeimage);
+}
+
+static void rzg2l_cru_try_format(struct rzg2l_cru_dev *cru,
+ struct v4l2_pix_format *pix)
+{
+ /*
+ * The V4L2 specification clearly documents the colorspace fields
+ * as being set by drivers for capture devices. Using the values
+ * supplied by userspace thus wouldn't comply with the API. Until
+ * the API is updated force fixed values.
+ */
+ pix->colorspace = RZG2L_CRU_DEFAULT_COLORSPACE;
+ pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace);
+ pix->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace);
+ pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, pix->colorspace,
+ pix->ycbcr_enc);
+
+ rzg2l_cru_format_align(cru, pix);
+}
+
+static int rzg2l_cru_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ struct rzg2l_cru_dev *cru = video_drvdata(file);
+
+ strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
+ strscpy(cap->card, "RZG2L_CRU", sizeof(cap->card));
+ snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+ dev_name(cru->dev));
+ return 0;
+}
+
+static int rzg2l_cru_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct rzg2l_cru_dev *cru = video_drvdata(file);
+
+ rzg2l_cru_try_format(cru, &f->fmt.pix);
+
+ return 0;
+}
+
+static int rzg2l_cru_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct rzg2l_cru_dev *cru = video_drvdata(file);
+
+ if (vb2_is_busy(&cru->queue))
+ return -EBUSY;
+
+ rzg2l_cru_try_format(cru, &f->fmt.pix);
+
+ cru->format = f->fmt.pix;
+
+ cru->compose.top = 0;
+ cru->compose.left = 0;
+ cru->compose.width = cru->format.width;
+ cru->compose.height = cru->format.height;
+
+ return 0;
+}
+
+static int rzg2l_cru_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct rzg2l_cru_dev *cru = video_drvdata(file);
+
+ f->fmt.pix = cru->format;
+
+ return 0;
+}
+
+static int rzg2l_cru_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ if (f->index >= ARRAY_SIZE(rzg2l_cru_formats))
+ return -EINVAL;
+
+ f->pixelformat = rzg2l_cru_formats[f->index].format;
+
+ return 0;
+}
+
+static int rzg2l_cru_subscribe_event(struct v4l2_fh *fh,
+ const struct v4l2_event_subscription *sub)
+{
+ switch (sub->type) {
+ case V4L2_EVENT_SOURCE_CHANGE:
+ return v4l2_event_subscribe(fh, sub, 4, NULL);
+ }
+ return v4l2_ctrl_subscribe_event(fh, sub);
+}
+
+static const struct v4l2_ioctl_ops rzg2l_cru_ioctl_ops = {
+ .vidioc_querycap = rzg2l_cru_querycap,
+ .vidioc_try_fmt_vid_cap = rzg2l_cru_try_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = rzg2l_cru_g_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = rzg2l_cru_s_fmt_vid_cap,
+ .vidioc_enum_fmt_vid_cap = rzg2l_cru_enum_fmt_vid_cap,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+
+ .vidioc_log_status = v4l2_ctrl_log_status,
+ .vidioc_subscribe_event = rzg2l_cru_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+/* -----------------------------------------------------------------------------
+ * Media controller file operations
+ */
+
+static int rzg2l_cru_open(struct file *file)
+{
+ struct rzg2l_cru_dev *cru = video_drvdata(file);
+ int ret;
+
+ ret = pm_runtime_resume_and_get(cru->dev);
+ if (ret < 0)
+ return ret;
+
+ ret = mutex_lock_interruptible(&cru->lock);
+ if (ret)
+ goto err_pm;
+
+ file->private_data = cru;
+ ret = v4l2_fh_open(file);
+ if (ret)
+ goto err_unlock;
+
+ ret = v4l2_pipeline_pm_get(&cru->vdev.entity);
+ if (ret < 0)
+ goto err_open;
+
+ ret = v4l2_ctrl_handler_setup(&cru->ctrl_handler);
+ if (ret)
+ goto err_power;
+
+ mutex_unlock(&cru->lock);
+
+ return 0;
+err_power:
+ v4l2_pipeline_pm_put(&cru->vdev.entity);
+err_open:
+ v4l2_fh_release(file);
+err_unlock:
+ mutex_unlock(&cru->lock);
+err_pm:
+ pm_runtime_put(cru->dev);
+
+ return ret;
+}
+
+static int rzg2l_cru_release(struct file *file)
+{
+ struct rzg2l_cru_dev *cru = video_drvdata(file);
+ int ret;
+
+ mutex_lock(&cru->lock);
+
+ /* the release helper will cleanup any on-going streaming. */
+ ret = _vb2_fop_release(file, NULL);
+
+ v4l2_pipeline_pm_put(&cru->vdev.entity);
+ pm_runtime_put(cru->dev);
+
+ mutex_unlock(&cru->lock);
+
+ return ret;
+}
+
+static const struct v4l2_file_operations rzg2l_cru_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = video_ioctl2,
+ .open = rzg2l_cru_open,
+ .release = rzg2l_cru_release,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+ .read = vb2_fop_read,
+};
+
+void rzg2l_cru_v4l2_unregister(struct rzg2l_cru_dev *cru)
+{
+ if (!video_is_registered(&cru->vdev))
+ return;
+
+ v4l2_info(&cru->v4l2_dev, "Removed %s\n",
+ video_device_node_name(&cru->vdev));
+
+ /* Checks internally if vdev have been init or not */
+ video_unregister_device(&cru->vdev);
+}
+
+static void rzg2l_cru_notify(struct v4l2_subdev *sd,
+ unsigned int notification, void *arg)
+{
+ struct rzg2l_cru_dev *cru =
+ container_of(sd->v4l2_dev, struct rzg2l_cru_dev, v4l2_dev);
+ struct v4l2_subdev *remote;
+ struct media_pad *pad;
+
+ pad = media_entity_remote_pad(&cru->pad);
+ if (!pad)
+ return;
+
+ remote = media_entity_to_v4l2_subdev(pad->entity);
+ if (remote != sd)
+ return;
+
+ switch (notification) {
+ case V4L2_DEVICE_NOTIFY_EVENT:
+ v4l2_event_queue(&cru->vdev, arg);
+ break;
+ }
+}
+
+int rzg2l_cru_v4l2_register(struct rzg2l_cru_dev *cru)
+{
+ struct video_device *vdev = &cru->vdev;
+ int ret;
+
+ cru->v4l2_dev.notify = rzg2l_cru_notify;
+
+ /* video node */
+ vdev->v4l2_dev = &cru->v4l2_dev;
+ vdev->queue = &cru->queue;
+ snprintf(vdev->name, sizeof(vdev->name), "CRU output");
+ vdev->release = video_device_release_empty;
+ vdev->lock = &cru->lock;
+ vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
+ V4L2_CAP_READWRITE;
+
+ /* Set a default format */
+ cru->format.pixelformat = RZG2L_CRU_DEFAULT_FORMAT;
+ cru->format.width = RZG2L_CRU_DEFAULT_WIDTH;
+ cru->format.height = RZG2L_CRU_DEFAULT_HEIGHT;
+ cru->format.field = RZG2L_CRU_DEFAULT_FIELD;
+ cru->format.colorspace = RZG2L_CRU_DEFAULT_COLORSPACE;
+
+ vdev->device_caps |= V4L2_CAP_IO_MC;
+ vdev->fops = &rzg2l_cru_fops;
+ vdev->ioctl_ops = &rzg2l_cru_ioctl_ops;
+
+ rzg2l_cru_format_align(cru, &cru->format);
+
+ ret = video_register_device(&cru->vdev, VFL_TYPE_VIDEO, -1);
+ if (ret) {
+ dev_err(cru->dev, "Failed to register video device\n");
+ return ret;
+ }
+
+ video_set_drvdata(&cru->vdev, cru);
+
+ v4l2_info(&cru->v4l2_dev, "Device registered as %s\n",
+ video_device_node_name(&cru->vdev));
+
+ return ret;
+}
--
2.17.1