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
ivtv_might_use_pio(struct ivtv_stream * s)18 static 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
ivtv_use_pio(struct ivtv_stream * s)23 static 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
ivtv_might_use_dma(struct ivtv_stream * s)31 static inline int ivtv_might_use_dma(struct ivtv_stream *s)
32 {
33 return s->dma != DMA_NONE;
34 }
35
ivtv_use_dma(struct ivtv_stream * s)36 static inline int ivtv_use_dma(struct ivtv_stream *s)
37 {
38 return !ivtv_use_pio(s);
39 }
40
ivtv_buf_sync_for_cpu(struct ivtv_stream * s,struct ivtv_buffer * buf)41 static 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
ivtv_buf_sync_for_device(struct ivtv_stream * s,struct ivtv_buffer * buf)48 static 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
56 int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
57 void ivtv_buf_swap(struct ivtv_buffer *buf);
58
59 /* ivtv_queue utility functions */
60 void ivtv_queue_init(struct ivtv_queue *q);
61 void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
62 struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
63 int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
64 struct ivtv_queue *to, int needed_bytes);
65 void ivtv_flush_queues(struct ivtv_stream *s);
66
67 /* ivtv_stream utility functions */
68 int ivtv_stream_alloc(struct ivtv_stream *s);
69 void ivtv_stream_free(struct ivtv_stream *s);
70
ivtv_stream_sync_for_cpu(struct ivtv_stream * s)71 static 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
ivtv_stream_sync_for_device(struct ivtv_stream * s)79 static 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
88