1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-queue.h b/drivers/media/pci/cx18/cx18-queue.h
new file mode 100644
index 000000000..26f2097c0
--- /dev/null
+++ b/drivers/media/pci/cx18/cx18-queue.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *  cx18 buffer queues
+ *
+ *  Derived from ivtv-queue.h
+ *
+ *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
+ *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
+ */
+
+#define CX18_DMA_UNMAPPED	((u32) -1)
+
+/* cx18_buffer utility functions */
+
+static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
+	struct cx18_buffer *buf)
+{
+	dma_sync_single_for_cpu(&s->cx->pci_dev->dev, buf->dma_handle,
+				s->buf_size, s->dma);
+}
+
+static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
+	struct cx18_buffer *buf)
+{
+	dma_sync_single_for_device(&s->cx->pci_dev->dev, buf->dma_handle,
+				   s->buf_size, s->dma);
+}
+
+void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
+
+static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
+					    struct cx18_mdl *mdl)
+{
+	if (list_is_singular(&mdl->buf_list))
+		cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
+							     struct cx18_buffer,
+							     list));
+	else
+		_cx18_mdl_sync_for_device(s, mdl);
+}
+
+void cx18_buf_swap(struct cx18_buffer *buf);
+void _cx18_mdl_swap(struct cx18_mdl *mdl);
+
+static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
+{
+	if (list_is_singular(&mdl->buf_list))
+		cx18_buf_swap(list_first_entry(&mdl->buf_list,
+					       struct cx18_buffer, list));
+	else
+		_cx18_mdl_swap(mdl);
+}
+
+/* cx18_queue utility functions */
+struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
+				 struct cx18_queue *q, int to_front);
+
+static inline
+struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
+				struct cx18_queue *q)
+{
+	return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
+}
+
+static inline
+struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
+			     struct cx18_queue *q)
+{
+	return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
+}
+
+void cx18_queue_init(struct cx18_queue *q);
+struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
+struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
+	u32 bytesused);
+void cx18_flush_queues(struct cx18_stream *s);
+
+/* queue MDL reconfiguration helpers */
+void cx18_unload_queues(struct cx18_stream *s);
+void cx18_load_queues(struct cx18_stream *s);
+
+/* cx18_stream utility functions */
+int cx18_stream_alloc(struct cx18_stream *s);
+void cx18_stream_free(struct cx18_stream *s);