1 /*
2 buffer queues.
3 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
4 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
5 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #ifndef IVTV_QUEUE_H
23 #define IVTV_QUEUE_H
24
25 #define IVTV_DMA_UNMAPPED ((u32) -1)
26 #define SLICED_VBI_PIO 1
27
28 /* ivtv_buffer utility functions */
29
30 static inline int ivtv_might_use_pio(struct ivtv_stream *s)
31 {
32 return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
33 }
34
35 static inline int ivtv_use_pio(struct ivtv_stream *s)
36 {
37 struct ivtv *itv = s->itv;
38
39 return s->dma == PCI_DMA_NONE ||
40 (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
41 }
42
43 static inline int ivtv_might_use_dma(struct ivtv_stream *s)
44 {
45 return s->dma != PCI_DMA_NONE;
46 }
47
48 static inline int ivtv_use_dma(struct ivtv_stream *s)
49 {
50 return !ivtv_use_pio(s);
51 }
52
53 static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
54 {
55 if (ivtv_use_dma(s))
56 pci_dma_sync_single_for_cpu(s->itv->dev, buf->dma_handle,
57 s->buf_size + 256, s->dma);
58 }
59
60 static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
61 {
62 if (ivtv_use_dma(s))
63 pci_dma_sync_single_for_device(s->itv->dev, buf->dma_handle,
64 s->buf_size + 256, s->dma);
65 }
66
67 int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
68 void ivtv_buf_swap(struct ivtv_buffer *buf);
69
70 /* ivtv_queue utility functions */
71 void ivtv_queue_init(struct ivtv_queue *q);
72 void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
73 struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
74 int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
75 struct ivtv_queue *to, int needed_bytes);
76 void ivtv_flush_queues(struct ivtv_stream *s);
77
78 /* ivtv_stream utility functions */
79 int ivtv_stream_alloc(struct ivtv_stream *s);
80 void ivtv_stream_free(struct ivtv_stream *s);
81
82 static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
83 {
84 if (ivtv_use_dma(s))
85 pci_dma_sync_single_for_cpu(s->itv->dev, s->sg_handle,
86 sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
87 }
88
89 static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
90 {
91 if (ivtv_use_dma(s))
92 pci_dma_sync_single_for_device(s->itv->dev, s->sg_handle,
93 sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
94 }
95
96 #endif
97
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