blob: 2ed8d548255d95f58b31bdc38e8db9df63e1cc2b [file] [log] [blame]
Hans Verkuil1a0adaf2007-04-27 12:31:25 -03001/*
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#define IVTV_DMA_UNMAPPED ((u32) -1)
Hans Verkuildc02d502007-05-19 14:07:16 -030023#define SLICED_VBI_PIO 1
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030024
25/* ivtv_buffer utility functions */
Hans Verkuildc02d502007-05-19 14:07:16 -030026
27static inline int ivtv_might_use_pio(struct ivtv_stream *s)
28{
29 return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
30}
31
32static inline int ivtv_use_pio(struct ivtv_stream *s)
33{
34 struct ivtv *itv = s->itv;
35
36 return s->dma == PCI_DMA_NONE ||
37 (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
38}
39
40static inline int ivtv_might_use_dma(struct ivtv_stream *s)
41{
42 return s->dma != PCI_DMA_NONE;
43}
44
45static inline int ivtv_use_dma(struct ivtv_stream *s)
46{
47 return !ivtv_use_pio(s);
48}
49
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030050static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
51{
Hans Verkuildc02d502007-05-19 14:07:16 -030052 if (ivtv_use_dma(s))
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030053 pci_dma_sync_single_for_cpu(s->itv->dev, buf->dma_handle,
54 s->buf_size + 256, s->dma);
55}
56
57static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
58{
Hans Verkuildc02d502007-05-19 14:07:16 -030059 if (ivtv_use_dma(s))
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030060 pci_dma_sync_single_for_device(s->itv->dev, buf->dma_handle,
61 s->buf_size + 256, s->dma);
62}
63
64int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
65void ivtv_buf_swap(struct ivtv_buffer *buf);
66
67/* ivtv_queue utility functions */
68void ivtv_queue_init(struct ivtv_queue *q);
69void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
70struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
71int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
72 struct ivtv_queue *to, int needed_bytes);
73void ivtv_flush_queues(struct ivtv_stream *s);
74
75/* ivtv_stream utility functions */
76int ivtv_stream_alloc(struct ivtv_stream *s);
77void ivtv_stream_free(struct ivtv_stream *s);
78
79static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
80{
Hans Verkuildc02d502007-05-19 14:07:16 -030081 if (ivtv_use_dma(s))
82 pci_dma_sync_single_for_cpu(s->itv->dev, s->SG_handle,
83 sizeof(struct ivtv_SG_element) * s->buffers, PCI_DMA_TODEVICE);
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030084}
85
86static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
87{
Hans Verkuildc02d502007-05-19 14:07:16 -030088 if (ivtv_use_dma(s))
89 pci_dma_sync_single_for_device(s->itv->dev, s->SG_handle,
90 sizeof(struct ivtv_SG_element) * s->buffers, PCI_DMA_TODEVICE);
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030091}