1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun buffer queues.
4*4882a593Smuzhiyun Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5*4882a593Smuzhiyun Copyright (C) 2004 Chris Kennedy <c@groovy.org>
6*4882a593Smuzhiyun Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #ifndef IVTV_QUEUE_H
11*4882a593Smuzhiyun #define IVTV_QUEUE_H
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #define IVTV_DMA_UNMAPPED ((u32) -1)
14*4882a593Smuzhiyun #define SLICED_VBI_PIO 0
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /* ivtv_buffer utility functions */
17*4882a593Smuzhiyun
ivtv_might_use_pio(struct ivtv_stream * s)18*4882a593Smuzhiyun static inline int ivtv_might_use_pio(struct ivtv_stream *s)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
ivtv_use_pio(struct ivtv_stream * s)23*4882a593Smuzhiyun static inline int ivtv_use_pio(struct ivtv_stream *s)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct ivtv *itv = s->itv;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun return s->dma == PCI_DMA_NONE ||
28*4882a593Smuzhiyun (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
ivtv_might_use_dma(struct ivtv_stream * s)31*4882a593Smuzhiyun static inline int ivtv_might_use_dma(struct ivtv_stream *s)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun return s->dma != PCI_DMA_NONE;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
ivtv_use_dma(struct ivtv_stream * s)36*4882a593Smuzhiyun static inline int ivtv_use_dma(struct ivtv_stream *s)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun return !ivtv_use_pio(s);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
ivtv_buf_sync_for_cpu(struct ivtv_stream * s,struct ivtv_buffer * buf)41*4882a593Smuzhiyun static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun if (ivtv_use_dma(s))
44*4882a593Smuzhiyun pci_dma_sync_single_for_cpu(s->itv->pdev, buf->dma_handle,
45*4882a593Smuzhiyun s->buf_size + 256, s->dma);
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
ivtv_buf_sync_for_device(struct ivtv_stream * s,struct ivtv_buffer * buf)48*4882a593Smuzhiyun static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun if (ivtv_use_dma(s))
51*4882a593Smuzhiyun pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle,
52*4882a593Smuzhiyun s->buf_size + 256, s->dma);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
56*4882a593Smuzhiyun void ivtv_buf_swap(struct ivtv_buffer *buf);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /* ivtv_queue utility functions */
59*4882a593Smuzhiyun void ivtv_queue_init(struct ivtv_queue *q);
60*4882a593Smuzhiyun void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
61*4882a593Smuzhiyun struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
62*4882a593Smuzhiyun int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
63*4882a593Smuzhiyun struct ivtv_queue *to, int needed_bytes);
64*4882a593Smuzhiyun void ivtv_flush_queues(struct ivtv_stream *s);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /* ivtv_stream utility functions */
67*4882a593Smuzhiyun int ivtv_stream_alloc(struct ivtv_stream *s);
68*4882a593Smuzhiyun void ivtv_stream_free(struct ivtv_stream *s);
69*4882a593Smuzhiyun
ivtv_stream_sync_for_cpu(struct ivtv_stream * s)70*4882a593Smuzhiyun static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun if (ivtv_use_dma(s))
73*4882a593Smuzhiyun pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle,
74*4882a593Smuzhiyun sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
ivtv_stream_sync_for_device(struct ivtv_stream * s)77*4882a593Smuzhiyun static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun if (ivtv_use_dma(s))
80*4882a593Smuzhiyun pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle,
81*4882a593Smuzhiyun sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun #endif
85