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84 lines
2.5 KiB
84 lines
2.5 KiB
/* 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 <[email protected]> |
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Copyright (C) 2005-2007 Hans Verkuil <[email protected]> |
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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 == PCI_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 == PCI_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 != PCI_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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pci_dma_sync_single_for_cpu(s->itv->pdev, 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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pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle, |
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s->buf_size + 256, 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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pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle, |
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sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE); |
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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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pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle, |
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sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE); |
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} |
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#endif
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