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