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 #define IVTV_DMA_UNMAPPED       ((u32) -1)
  23
  24 /* ivtv_buffer utility functions */
  25 static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
  26 {
  27         if (s->dma != PCI_DMA_NONE)
  28                 pci_dma_sync_single_for_cpu(s->itv->dev, buf->dma_handle,
  29                                 s->buf_size + 256, s->dma);
  30 }
  31
  32 static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
  33 {
  34         if (s->dma != PCI_DMA_NONE)
  35                 pci_dma_sync_single_for_device(s->itv->dev, buf->dma_handle,
  36                                 s->buf_size + 256, s->dma);
  37 }
  38
  39 int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
  40 void ivtv_buf_swap(struct ivtv_buffer *buf);
  41
  42 /* ivtv_queue utility functions */
  43 void ivtv_queue_init(struct ivtv_queue *q);
  44 void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
  45 struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
  46 int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
  47                     struct ivtv_queue *to, int needed_bytes);
  48 void ivtv_flush_queues(struct ivtv_stream *s);
  49
  50 /* ivtv_stream utility functions */
  51 int ivtv_stream_alloc(struct ivtv_stream *s);
  52 void ivtv_stream_free(struct ivtv_stream *s);
  53
  54 static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
  55 {
  56         pci_dma_sync_single_for_cpu(s->itv->dev, s->SG_handle,
  57                 sizeof(struct ivtv_SG_element) * s->buffers, PCI_DMA_TODEVICE);
  58 }
  59
  60 static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
  61 {
  62         pci_dma_sync_single_for_device(s->itv->dev, s->SG_handle,
  63                 sizeof(struct ivtv_SG_element) * s->buffers, PCI_DMA_TODEVICE);
  64 }