88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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buffer queues.
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Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
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Copyright (C) 2004 Chris Kennedy <c@groovy.org>
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Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
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*/
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#ifndef IVTV_QUEUE_H
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#define IVTV_QUEUE_H
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#define IVTV_DMA_UNMAPPED ((u32) -1)
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#define SLICED_VBI_PIO 0
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/* ivtv_buffer utility functions */
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static inline int ivtv_might_use_pio(struct ivtv_stream *s)
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{
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return s->dma == DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
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}
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static inline int ivtv_use_pio(struct ivtv_stream *s)
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{
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struct ivtv *itv = s->itv;
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return s->dma == DMA_NONE ||
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(SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
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}
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static inline int ivtv_might_use_dma(struct ivtv_stream *s)
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{
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return s->dma != DMA_NONE;
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}
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static inline int ivtv_use_dma(struct ivtv_stream *s)
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{
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return !ivtv_use_pio(s);
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}
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static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
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{
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if (ivtv_use_dma(s))
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dma_sync_single_for_cpu(&s->itv->pdev->dev, buf->dma_handle,
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s->buf_size + 256, s->dma);
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}
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static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
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{
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if (ivtv_use_dma(s))
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dma_sync_single_for_device(&s->itv->pdev->dev,
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buf->dma_handle, s->buf_size + 256,
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s->dma);
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}
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int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
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void ivtv_buf_swap(struct ivtv_buffer *buf);
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/* ivtv_queue utility functions */
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void ivtv_queue_init(struct ivtv_queue *q);
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void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
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struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
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int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
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struct ivtv_queue *to, int needed_bytes);
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void ivtv_flush_queues(struct ivtv_stream *s);
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/* ivtv_stream utility functions */
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int ivtv_stream_alloc(struct ivtv_stream *s);
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void ivtv_stream_free(struct ivtv_stream *s);
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static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
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{
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if (ivtv_use_dma(s))
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dma_sync_single_for_cpu(&s->itv->pdev->dev, s->sg_handle,
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sizeof(struct ivtv_sg_element),
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DMA_TO_DEVICE);
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}
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static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
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{
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if (ivtv_use_dma(s))
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dma_sync_single_for_device(&s->itv->pdev->dev, s->sg_handle,
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sizeof(struct ivtv_sg_element),
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DMA_TO_DEVICE);
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}
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#endif
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