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 0
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->pdev, 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->pdev, 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->pdev, 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->pdev, s->sg_handle,
93 			sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
94 }
95 
96 #endif
97