drivers/media/pci/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 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