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Diffstat (limited to 'drivers/media/platform/xilinx/xilinx-dma.c')
-rw-r--r--drivers/media/platform/xilinx/xilinx-dma.c769
1 files changed, 769 insertions, 0 deletions
diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
new file mode 100644
index 000000000..d041f94be
--- /dev/null
+++ b/drivers/media/platform/xilinx/xilinx-dma.c
@@ -0,0 +1,769 @@
+/*
+ * Xilinx Video DMA
+ *
+ * Copyright (C) 2013-2015 Ideas on Board
+ * Copyright (C) 2013-2015 Xilinx, Inc.
+ *
+ * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
+ * Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/dma/xilinx_dma.h>
+#include <linux/lcm.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-dev.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-v4l2.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "xilinx-dma.h"
+#include "xilinx-vip.h"
+#include "xilinx-vipp.h"
+
+#define XVIP_DMA_DEF_FORMAT V4L2_PIX_FMT_YUYV
+#define XVIP_DMA_DEF_WIDTH 1920
+#define XVIP_DMA_DEF_HEIGHT 1080
+
+/* Minimum and maximum widths are expressed in bytes */
+#define XVIP_DMA_MIN_WIDTH 1U
+#define XVIP_DMA_MAX_WIDTH 65535U
+#define XVIP_DMA_MIN_HEIGHT 1U
+#define XVIP_DMA_MAX_HEIGHT 8191U
+
+/* -----------------------------------------------------------------------------
+ * Helper functions
+ */
+
+static struct v4l2_subdev *
+xvip_dma_remote_subdev(struct media_pad *local, u32 *pad)
+{
+ struct media_pad *remote;
+
+ remote = media_entity_remote_pad(local);
+ if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
+ return NULL;
+
+ if (pad)
+ *pad = remote->index;
+
+ return media_entity_to_v4l2_subdev(remote->entity);
+}
+
+static int xvip_dma_verify_format(struct xvip_dma *dma)
+{
+ struct v4l2_subdev_format fmt;
+ struct v4l2_subdev *subdev;
+ int ret;
+
+ subdev = xvip_dma_remote_subdev(&dma->pad, &fmt.pad);
+ if (subdev == NULL)
+ return -EPIPE;
+
+ fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+ if (ret < 0)
+ return ret == -ENOIOCTLCMD ? -EINVAL : ret;
+
+ if (dma->fmtinfo->code != fmt.format.code ||
+ dma->format.height != fmt.format.height ||
+ dma->format.width != fmt.format.width ||
+ dma->format.colorspace != fmt.format.colorspace)
+ return -EINVAL;
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Pipeline Stream Management
+ */
+
+/**
+ * xvip_pipeline_start_stop - Start ot stop streaming on a pipeline
+ * @pipe: The pipeline
+ * @start: Start (when true) or stop (when false) the pipeline
+ *
+ * Walk the entities chain starting at the pipeline output video node and start
+ * or stop all of them.
+ *
+ * Return: 0 if successful, or the return value of the failed video::s_stream
+ * operation otherwise.
+ */
+static int xvip_pipeline_start_stop(struct xvip_pipeline *pipe, bool start)
+{
+ struct xvip_dma *dma = pipe->output;
+ struct media_entity *entity;
+ struct media_pad *pad;
+ struct v4l2_subdev *subdev;
+ int ret;
+
+ entity = &dma->video.entity;
+ while (1) {
+ pad = &entity->pads[0];
+ if (!(pad->flags & MEDIA_PAD_FL_SINK))
+ break;
+
+ pad = media_entity_remote_pad(pad);
+ if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
+ break;
+
+ entity = pad->entity;
+ subdev = media_entity_to_v4l2_subdev(entity);
+
+ ret = v4l2_subdev_call(subdev, video, s_stream, start);
+ if (start && ret < 0 && ret != -ENOIOCTLCMD)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * xvip_pipeline_set_stream - Enable/disable streaming on a pipeline
+ * @pipe: The pipeline
+ * @on: Turn the stream on when true or off when false
+ *
+ * The pipeline is shared between all DMA engines connect at its input and
+ * output. While the stream state of DMA engines can be controlled
+ * independently, pipelines have a shared stream state that enable or disable
+ * all entities in the pipeline. For this reason the pipeline uses a streaming
+ * counter that tracks the number of DMA engines that have requested the stream
+ * to be enabled.
+ *
+ * When called with the @on argument set to true, this function will increment
+ * the pipeline streaming count. If the streaming count reaches the number of
+ * DMA engines in the pipeline it will enable all entities that belong to the
+ * pipeline.
+ *
+ * Similarly, when called with the @on argument set to false, this function will
+ * decrement the pipeline streaming count and disable all entities in the
+ * pipeline when the streaming count reaches zero.
+ *
+ * Return: 0 if successful, or the return value of the failed video::s_stream
+ * operation otherwise. Stopping the pipeline never fails. The pipeline state is
+ * not updated when the operation fails.
+ */
+static int xvip_pipeline_set_stream(struct xvip_pipeline *pipe, bool on)
+{
+ int ret = 0;
+
+ mutex_lock(&pipe->lock);
+
+ if (on) {
+ if (pipe->stream_count == pipe->num_dmas - 1) {
+ ret = xvip_pipeline_start_stop(pipe, true);
+ if (ret < 0)
+ goto done;
+ }
+ pipe->stream_count++;
+ } else {
+ if (--pipe->stream_count == 0)
+ xvip_pipeline_start_stop(pipe, false);
+ }
+
+done:
+ mutex_unlock(&pipe->lock);
+ return ret;
+}
+
+static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
+ struct xvip_dma *start)
+{
+ struct media_graph graph;
+ struct media_entity *entity = &start->video.entity;
+ struct media_device *mdev = entity->graph_obj.mdev;
+ unsigned int num_inputs = 0;
+ unsigned int num_outputs = 0;
+ int ret;
+
+ mutex_lock(&mdev->graph_mutex);
+
+ /* Walk the graph to locate the video nodes. */
+ ret = media_graph_walk_init(&graph, mdev);
+ if (ret) {
+ mutex_unlock(&mdev->graph_mutex);
+ return ret;
+ }
+
+ media_graph_walk_start(&graph, entity);
+
+ while ((entity = media_graph_walk_next(&graph))) {
+ struct xvip_dma *dma;
+
+ if (entity->function != MEDIA_ENT_F_IO_V4L)
+ continue;
+
+ dma = to_xvip_dma(media_entity_to_video_device(entity));
+
+ if (dma->pad.flags & MEDIA_PAD_FL_SINK) {
+ pipe->output = dma;
+ num_outputs++;
+ } else {
+ num_inputs++;
+ }
+ }
+
+ mutex_unlock(&mdev->graph_mutex);
+
+ media_graph_walk_cleanup(&graph);
+
+ /* We need exactly one output and zero or one input. */
+ if (num_outputs != 1 || num_inputs > 1)
+ return -EPIPE;
+
+ pipe->num_dmas = num_inputs + num_outputs;
+
+ return 0;
+}
+
+static void __xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
+{
+ pipe->num_dmas = 0;
+ pipe->output = NULL;
+}
+
+/**
+ * xvip_pipeline_cleanup - Cleanup the pipeline after streaming
+ * @pipe: the pipeline
+ *
+ * Decrease the pipeline use count and clean it up if we were the last user.
+ */
+static void xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
+{
+ mutex_lock(&pipe->lock);
+
+ /* If we're the last user clean up the pipeline. */
+ if (--pipe->use_count == 0)
+ __xvip_pipeline_cleanup(pipe);
+
+ mutex_unlock(&pipe->lock);
+}
+
+/**
+ * xvip_pipeline_prepare - Prepare the pipeline for streaming
+ * @pipe: the pipeline
+ * @dma: DMA engine at one end of the pipeline
+ *
+ * Validate the pipeline if no user exists yet, otherwise just increase the use
+ * count.
+ *
+ * Return: 0 if successful or -EPIPE if the pipeline is not valid.
+ */
+static int xvip_pipeline_prepare(struct xvip_pipeline *pipe,
+ struct xvip_dma *dma)
+{
+ int ret;
+
+ mutex_lock(&pipe->lock);
+
+ /* If we're the first user validate and initialize the pipeline. */
+ if (pipe->use_count == 0) {
+ ret = xvip_pipeline_validate(pipe, dma);
+ if (ret < 0) {
+ __xvip_pipeline_cleanup(pipe);
+ goto done;
+ }
+ }
+
+ pipe->use_count++;
+ ret = 0;
+
+done:
+ mutex_unlock(&pipe->lock);
+ return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * videobuf2 queue operations
+ */
+
+/**
+ * struct xvip_dma_buffer - Video DMA buffer
+ * @buf: vb2 buffer base object
+ * @queue: buffer list entry in the DMA engine queued buffers list
+ * @dma: DMA channel that uses the buffer
+ */
+struct xvip_dma_buffer {
+ struct vb2_v4l2_buffer buf;
+ struct list_head queue;
+ struct xvip_dma *dma;
+};
+
+#define to_xvip_dma_buffer(vb) container_of(vb, struct xvip_dma_buffer, buf)
+
+static void xvip_dma_complete(void *param)
+{
+ struct xvip_dma_buffer *buf = param;
+ struct xvip_dma *dma = buf->dma;
+
+ spin_lock(&dma->queued_lock);
+ list_del(&buf->queue);
+ spin_unlock(&dma->queued_lock);
+
+ buf->buf.field = V4L2_FIELD_NONE;
+ buf->buf.sequence = dma->sequence++;
+ buf->buf.vb2_buf.timestamp = ktime_get_ns();
+ vb2_set_plane_payload(&buf->buf.vb2_buf, 0, dma->format.sizeimage);
+ vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
+}
+
+static int
+xvip_dma_queue_setup(struct vb2_queue *vq,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], struct device *alloc_devs[])
+{
+ struct xvip_dma *dma = vb2_get_drv_priv(vq);
+
+ /* Make sure the image size is large enough. */
+ if (*nplanes)
+ return sizes[0] < dma->format.sizeimage ? -EINVAL : 0;
+
+ *nplanes = 1;
+ sizes[0] = dma->format.sizeimage;
+
+ return 0;
+}
+
+static int xvip_dma_buffer_prepare(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
+ struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
+
+ buf->dma = dma;
+
+ return 0;
+}
+
+static void xvip_dma_buffer_queue(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
+ struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
+ struct dma_async_tx_descriptor *desc;
+ dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0);
+ u32 flags;
+
+ if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
+ dma->xt.dir = DMA_DEV_TO_MEM;
+ dma->xt.src_sgl = false;
+ dma->xt.dst_sgl = true;
+ dma->xt.dst_start = addr;
+ } else {
+ flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
+ dma->xt.dir = DMA_MEM_TO_DEV;
+ dma->xt.src_sgl = true;
+ dma->xt.dst_sgl = false;
+ dma->xt.src_start = addr;
+ }
+
+ dma->xt.frame_size = 1;
+ dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp;
+ dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size;
+ dma->xt.numf = dma->format.height;
+
+ desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags);
+ if (!desc) {
+ dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n");
+ vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
+ return;
+ }
+ desc->callback = xvip_dma_complete;
+ desc->callback_param = buf;
+
+ spin_lock_irq(&dma->queued_lock);
+ list_add_tail(&buf->queue, &dma->queued_bufs);
+ spin_unlock_irq(&dma->queued_lock);
+
+ dmaengine_submit(desc);
+
+ if (vb2_is_streaming(&dma->queue))
+ dma_async_issue_pending(dma->dma);
+}
+
+static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct xvip_dma *dma = vb2_get_drv_priv(vq);
+ struct xvip_dma_buffer *buf, *nbuf;
+ struct xvip_pipeline *pipe;
+ int ret;
+
+ dma->sequence = 0;
+
+ /*
+ * Start streaming on the pipeline. No link touching an entity in the
+ * pipeline can be activated or deactivated once streaming is started.
+ *
+ * Use the pipeline object embedded in the first DMA object that starts
+ * streaming.
+ */
+ pipe = dma->video.entity.pipe
+ ? to_xvip_pipeline(&dma->video.entity) : &dma->pipe;
+
+ ret = media_pipeline_start(&dma->video.entity, &pipe->pipe);
+ if (ret < 0)
+ goto error;
+
+ /* Verify that the configured format matches the output of the
+ * connected subdev.
+ */
+ ret = xvip_dma_verify_format(dma);
+ if (ret < 0)
+ goto error_stop;
+
+ ret = xvip_pipeline_prepare(pipe, dma);
+ if (ret < 0)
+ goto error_stop;
+
+ /* Start the DMA engine. This must be done before starting the blocks
+ * in the pipeline to avoid DMA synchronization issues.
+ */
+ dma_async_issue_pending(dma->dma);
+
+ /* Start the pipeline. */
+ xvip_pipeline_set_stream(pipe, true);
+
+ return 0;
+
+error_stop:
+ media_pipeline_stop(&dma->video.entity);
+
+error:
+ /* Give back all queued buffers to videobuf2. */
+ spin_lock_irq(&dma->queued_lock);
+ list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
+ vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED);
+ list_del(&buf->queue);
+ }
+ spin_unlock_irq(&dma->queued_lock);
+
+ return ret;
+}
+
+static void xvip_dma_stop_streaming(struct vb2_queue *vq)
+{
+ struct xvip_dma *dma = vb2_get_drv_priv(vq);
+ struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity);
+ struct xvip_dma_buffer *buf, *nbuf;
+
+ /* Stop the pipeline. */
+ xvip_pipeline_set_stream(pipe, false);
+
+ /* Stop and reset the DMA engine. */
+ dmaengine_terminate_all(dma->dma);
+
+ /* Cleanup the pipeline and mark it as being stopped. */
+ xvip_pipeline_cleanup(pipe);
+ media_pipeline_stop(&dma->video.entity);
+
+ /* Give back all queued buffers to videobuf2. */
+ spin_lock_irq(&dma->queued_lock);
+ list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
+ vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
+ list_del(&buf->queue);
+ }
+ spin_unlock_irq(&dma->queued_lock);
+}
+
+static const struct vb2_ops xvip_dma_queue_qops = {
+ .queue_setup = xvip_dma_queue_setup,
+ .buf_prepare = xvip_dma_buffer_prepare,
+ .buf_queue = xvip_dma_buffer_queue,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+ .start_streaming = xvip_dma_start_streaming,
+ .stop_streaming = xvip_dma_stop_streaming,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 ioctls
+ */
+
+static int
+xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
+
+ cap->device_caps = V4L2_CAP_STREAMING;
+
+ if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ cap->device_caps |= V4L2_CAP_VIDEO_CAPTURE;
+ else
+ cap->device_caps |= V4L2_CAP_VIDEO_OUTPUT;
+
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS
+ | dma->xdev->v4l2_caps;
+
+ strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver));
+ strlcpy(cap->card, dma->video.name, sizeof(cap->card));
+ snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s:%u",
+ dma->xdev->dev->of_node->name, dma->port);
+
+ return 0;
+}
+
+/* FIXME: without this callback function, some applications are not configured
+ * with correct formats, and it results in frames in wrong format. Whether this
+ * callback needs to be required is not clearly defined, so it should be
+ * clarified through the mailing list.
+ */
+static int
+xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
+
+ if (f->index > 0)
+ return -EINVAL;
+
+ f->pixelformat = dma->format.pixelformat;
+ strlcpy(f->description, dma->fmtinfo->description,
+ sizeof(f->description));
+
+ return 0;
+}
+
+static int
+xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
+
+ format->fmt.pix = dma->format;
+
+ return 0;
+}
+
+static void
+__xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix,
+ const struct xvip_video_format **fmtinfo)
+{
+ const struct xvip_video_format *info;
+ unsigned int min_width;
+ unsigned int max_width;
+ unsigned int min_bpl;
+ unsigned int max_bpl;
+ unsigned int width;
+ unsigned int align;
+ unsigned int bpl;
+
+ /* Retrieve format information and select the default format if the
+ * requested format isn't supported.
+ */
+ info = xvip_get_format_by_fourcc(pix->pixelformat);
+ if (IS_ERR(info))
+ info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
+
+ pix->pixelformat = info->fourcc;
+ pix->field = V4L2_FIELD_NONE;
+
+ /* The transfer alignment requirements are expressed in bytes. Compute
+ * the minimum and maximum values, clamp the requested width and convert
+ * it back to pixels.
+ */
+ align = lcm(dma->align, info->bpp);
+ min_width = roundup(XVIP_DMA_MIN_WIDTH, align);
+ max_width = rounddown(XVIP_DMA_MAX_WIDTH, align);
+ width = rounddown(pix->width * info->bpp, align);
+
+ pix->width = clamp(width, min_width, max_width) / info->bpp;
+ pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT,
+ XVIP_DMA_MAX_HEIGHT);
+
+ /* Clamp the requested bytes per line value. If the maximum bytes per
+ * line value is zero, the module doesn't support user configurable line
+ * sizes. Override the requested value with the minimum in that case.
+ */
+ min_bpl = pix->width * info->bpp;
+ max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align);
+ bpl = rounddown(pix->bytesperline, dma->align);
+
+ pix->bytesperline = clamp(bpl, min_bpl, max_bpl);
+ pix->sizeimage = pix->bytesperline * pix->height;
+
+ if (fmtinfo)
+ *fmtinfo = info;
+}
+
+static int
+xvip_dma_try_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
+
+ __xvip_dma_try_format(dma, &format->fmt.pix, NULL);
+ return 0;
+}
+
+static int
+xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
+ const struct xvip_video_format *info;
+
+ __xvip_dma_try_format(dma, &format->fmt.pix, &info);
+
+ if (vb2_is_busy(&dma->queue))
+ return -EBUSY;
+
+ dma->format = format->fmt.pix;
+ dma->fmtinfo = info;
+
+ return 0;
+}
+
+static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = {
+ .vidioc_querycap = xvip_dma_querycap,
+ .vidioc_enum_fmt_vid_cap = xvip_dma_enum_format,
+ .vidioc_g_fmt_vid_cap = xvip_dma_get_format,
+ .vidioc_g_fmt_vid_out = xvip_dma_get_format,
+ .vidioc_s_fmt_vid_cap = xvip_dma_set_format,
+ .vidioc_s_fmt_vid_out = xvip_dma_set_format,
+ .vidioc_try_fmt_vid_cap = xvip_dma_try_format,
+ .vidioc_try_fmt_vid_out = xvip_dma_try_format,
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+
+static const struct v4l2_file_operations xvip_dma_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = video_ioctl2,
+ .open = v4l2_fh_open,
+ .release = vb2_fop_release,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+};
+
+/* -----------------------------------------------------------------------------
+ * Xilinx Video DMA Core
+ */
+
+int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
+ enum v4l2_buf_type type, unsigned int port)
+{
+ char name[16];
+ int ret;
+
+ dma->xdev = xdev;
+ dma->port = port;
+ mutex_init(&dma->lock);
+ mutex_init(&dma->pipe.lock);
+ INIT_LIST_HEAD(&dma->queued_bufs);
+ spin_lock_init(&dma->queued_lock);
+
+ dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
+ dma->format.pixelformat = dma->fmtinfo->fourcc;
+ dma->format.colorspace = V4L2_COLORSPACE_SRGB;
+ dma->format.field = V4L2_FIELD_NONE;
+ dma->format.width = XVIP_DMA_DEF_WIDTH;
+ dma->format.height = XVIP_DMA_DEF_HEIGHT;
+ dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp;
+ dma->format.sizeimage = dma->format.bytesperline * dma->format.height;
+
+ /* Initialize the media entity... */
+ dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
+ ? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&dma->video.entity, 1, &dma->pad);
+ if (ret < 0)
+ goto error;
+
+ /* ... and the video node... */
+ dma->video.fops = &xvip_dma_fops;
+ dma->video.v4l2_dev = &xdev->v4l2_dev;
+ dma->video.queue = &dma->queue;
+ snprintf(dma->video.name, sizeof(dma->video.name), "%s %s %u",
+ xdev->dev->of_node->name,
+ type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input",
+ port);
+ dma->video.vfl_type = VFL_TYPE_GRABBER;
+ dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
+ ? VFL_DIR_RX : VFL_DIR_TX;
+ dma->video.release = video_device_release_empty;
+ dma->video.ioctl_ops = &xvip_dma_ioctl_ops;
+ dma->video.lock = &dma->lock;
+
+ video_set_drvdata(&dma->video, dma);
+
+ /* ... and the buffers queue... */
+ /* Don't enable VB2_READ and VB2_WRITE, as using the read() and write()
+ * V4L2 APIs would be inefficient. Testing on the command line with a
+ * 'cat /dev/video?' thus won't be possible, but given that the driver
+ * anyway requires a test tool to setup the pipeline before any video
+ * stream can be started, requiring a specific V4L2 test tool as well
+ * instead of 'cat' isn't really a drawback.
+ */
+ dma->queue.type = type;
+ dma->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+ dma->queue.lock = &dma->lock;
+ dma->queue.drv_priv = dma;
+ dma->queue.buf_struct_size = sizeof(struct xvip_dma_buffer);
+ dma->queue.ops = &xvip_dma_queue_qops;
+ dma->queue.mem_ops = &vb2_dma_contig_memops;
+ dma->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
+ | V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
+ dma->queue.dev = dma->xdev->dev;
+ ret = vb2_queue_init(&dma->queue);
+ if (ret < 0) {
+ dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n");
+ goto error;
+ }
+
+ /* ... and the DMA channel. */
+ snprintf(name, sizeof(name), "port%u", port);
+ dma->dma = dma_request_slave_channel(dma->xdev->dev, name);
+ if (dma->dma == NULL) {
+ dev_err(dma->xdev->dev, "no VDMA channel found\n");
+ ret = -ENODEV;
+ goto error;
+ }
+
+ dma->align = 1 << dma->dma->device->copy_align;
+
+ ret = video_register_device(&dma->video, VFL_TYPE_GRABBER, -1);
+ if (ret < 0) {
+ dev_err(dma->xdev->dev, "failed to register video device\n");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ xvip_dma_cleanup(dma);
+ return ret;
+}
+
+void xvip_dma_cleanup(struct xvip_dma *dma)
+{
+ if (video_is_registered(&dma->video))
+ video_unregister_device(&dma->video);
+
+ if (dma->dma)
+ dma_release_channel(dma->dma);
+
+ media_entity_cleanup(&dma->video.entity);
+
+ mutex_destroy(&dma->lock);
+ mutex_destroy(&dma->pipe.lock);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 11:46:20 +0000