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
85