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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 buffer queues.
4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
7
8 */
9
10#ifndef IVTV_QUEUE_H
11#define IVTV_QUEUE_H
12
13#define IVTV_DMA_UNMAPPED ((u32) -1)
14#define SLICED_VBI_PIO 0
15
16/* ivtv_buffer utility functions */
17
18static inline int ivtv_might_use_pio(struct ivtv_stream *s)
19{
20 return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
21}
22
23static inline int ivtv_use_pio(struct ivtv_stream *s)
24{
25 struct ivtv *itv = s->itv;
26
27 return s->dma == PCI_DMA_NONE ||
28 (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
29}
30
31static inline int ivtv_might_use_dma(struct ivtv_stream *s)
32{
33 return s->dma != PCI_DMA_NONE;
34}
35
36static inline int ivtv_use_dma(struct ivtv_stream *s)
37{
38 return !ivtv_use_pio(s);
39}
40
41static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
42{
43 if (ivtv_use_dma(s))
44 pci_dma_sync_single_for_cpu(s->itv->pdev, buf->dma_handle,
45 s->buf_size + 256, s->dma);
46}
47
48static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
49{
50 if (ivtv_use_dma(s))
51 pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle,
52 s->buf_size + 256, s->dma);
53}
54
55int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
56void ivtv_buf_swap(struct ivtv_buffer *buf);
57
58/* ivtv_queue utility functions */
59void ivtv_queue_init(struct ivtv_queue *q);
60void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
61struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
62int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
63 struct ivtv_queue *to, int needed_bytes);
64void ivtv_flush_queues(struct ivtv_stream *s);
65
66/* ivtv_stream utility functions */
67int ivtv_stream_alloc(struct ivtv_stream *s);
68void ivtv_stream_free(struct ivtv_stream *s);
69
70static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
71{
72 if (ivtv_use_dma(s))
73 pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle,
74 sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
75}
76
77static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
78{
79 if (ivtv_use_dma(s))
80 pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle,
81 sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
82}
83
84#endif
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 buffer queues.
4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
7
8 */
9
10#ifndef IVTV_QUEUE_H
11#define IVTV_QUEUE_H
12
13#define IVTV_DMA_UNMAPPED ((u32) -1)
14#define SLICED_VBI_PIO 0
15
16/* ivtv_buffer utility functions */
17
18static inline int ivtv_might_use_pio(struct ivtv_stream *s)
19{
20 return s->dma == DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
21}
22
23static inline int ivtv_use_pio(struct ivtv_stream *s)
24{
25 struct ivtv *itv = s->itv;
26
27 return s->dma == DMA_NONE ||
28 (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
29}
30
31static inline int ivtv_might_use_dma(struct ivtv_stream *s)
32{
33 return s->dma != DMA_NONE;
34}
35
36static inline int ivtv_use_dma(struct ivtv_stream *s)
37{
38 return !ivtv_use_pio(s);
39}
40
41static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
42{
43 if (ivtv_use_dma(s))
44 dma_sync_single_for_cpu(&s->itv->pdev->dev, buf->dma_handle,
45 s->buf_size + 256, s->dma);
46}
47
48static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
49{
50 if (ivtv_use_dma(s))
51 dma_sync_single_for_device(&s->itv->pdev->dev,
52 buf->dma_handle, s->buf_size + 256,
53 s->dma);
54}
55
56int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
57void ivtv_buf_swap(struct ivtv_buffer *buf);
58
59/* ivtv_queue utility functions */
60void ivtv_queue_init(struct ivtv_queue *q);
61void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
62struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
63int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
64 struct ivtv_queue *to, int needed_bytes);
65void ivtv_flush_queues(struct ivtv_stream *s);
66
67/* ivtv_stream utility functions */
68int ivtv_stream_alloc(struct ivtv_stream *s);
69void ivtv_stream_free(struct ivtv_stream *s);
70
71static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
72{
73 if (ivtv_use_dma(s))
74 dma_sync_single_for_cpu(&s->itv->pdev->dev, s->sg_handle,
75 sizeof(struct ivtv_sg_element),
76 DMA_TO_DEVICE);
77}
78
79static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
80{
81 if (ivtv_use_dma(s))
82 dma_sync_single_for_device(&s->itv->pdev->dev, s->sg_handle,
83 sizeof(struct ivtv_sg_element),
84 DMA_TO_DEVICE);
85}
86
87#endif