LXR linux/drivers/media/pci/cx18/cx18-queue.h

   1/*
   2 *  cx18 buffer queues
   3 *
   4 *  Derived from ivtv-queue.h
   5 *
   6 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7 *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; either version 2 of the License, or
  12 *  (at your option) any later version.
  13 *
  14 *  This program is distributed in the hope that it will be useful,
  15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 *  GNU General Public License for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License
  20 *  along with this program; if not, write to the Free Software
  21 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22 *  02111-1307  USA
  23 */
  24
  25#define CX18_DMA_UNMAPPED       ((u32) -1)
  26
  27/* cx18_buffer utility functions */
  28
  29static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
  30        struct cx18_buffer *buf)
  31{
  32        pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle,
  33                                s->buf_size, s->dma);
  34}
  35
  36static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
  37        struct cx18_buffer *buf)
  38{
  39        pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle,
  40                                s->buf_size, s->dma);
  41}
  42
  43void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
  44
  45static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
  46                                            struct cx18_mdl *mdl)
  47{
  48        if (list_is_singular(&mdl->buf_list))
  49                cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
  50                                                             struct cx18_buffer,
  51                                                             list));
  52        else
  53                _cx18_mdl_sync_for_device(s, mdl);
  54}
  55
  56void cx18_buf_swap(struct cx18_buffer *buf);
  57void _cx18_mdl_swap(struct cx18_mdl *mdl);
  58
  59static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
  60{
  61        if (list_is_singular(&mdl->buf_list))
  62                cx18_buf_swap(list_first_entry(&mdl->buf_list,
  63                                               struct cx18_buffer, list));
  64        else
  65                _cx18_mdl_swap(mdl);
  66}
  67
  68/* cx18_queue utility functions */
  69struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
  70                                 struct cx18_queue *q, int to_front);
  71
  72static inline
  73struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
  74                                struct cx18_queue *q)
  75{
  76        return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
  77}
  78
  79static inline
  80struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
  81                             struct cx18_queue *q)
  82{
  83        return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
  84}
  85
  86void cx18_queue_init(struct cx18_queue *q);
  87struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
  88struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
  89        u32 bytesused);
  90void cx18_flush_queues(struct cx18_stream *s);
  91
  92/* queue MDL reconfiguration helpers */
  93void cx18_unload_queues(struct cx18_stream *s);
  94void cx18_load_queues(struct cx18_stream *s);
  95
  96/* cx18_stream utility functions */
  97int cx18_stream_alloc(struct cx18_stream *s);
  98void cx18_stream_free(struct cx18_stream *s);
  99