LXR linux/drivers/media/video/ivtv/ivtv-queue.h

   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
  30static 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
  35static 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
  43static inline int ivtv_might_use_dma(struct ivtv_stream *s)
  44{
  45        return s->dma != PCI_DMA_NONE;
  46}
  47
  48static inline int ivtv_use_dma(struct ivtv_stream *s)
  49{
  50        return !ivtv_use_pio(s);
  51}
  52
  53static 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
  60static 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
  67int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
  68void ivtv_buf_swap(struct ivtv_buffer *buf);
  69
  70/* ivtv_queue utility functions */
  71void ivtv_queue_init(struct ivtv_queue *q);
  72void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
  73struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
  74int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
  75                    struct ivtv_queue *to, int needed_bytes);
  76void ivtv_flush_queues(struct ivtv_stream *s);
  77
  78/* ivtv_stream utility functions */
  79int ivtv_stream_alloc(struct ivtv_stream *s);
  80void ivtv_stream_free(struct ivtv_stream *s);
  81
  82static 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
  89static 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