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
  29 static 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
  36 static 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
  43 void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
  44
  45 static 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
  56 void cx18_buf_swap(struct cx18_buffer *buf);
  57 void _cx18_mdl_swap(struct cx18_mdl *mdl);
  58
  59 static 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 */
  69 struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
  70                                  struct cx18_queue *q, int to_front);
  71
  72 static inline
  73 struct 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
  79 static inline
  80 struct 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
  86 void cx18_queue_init(struct cx18_queue *q);
  87 struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
  88 struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
  89         u32 bytesused);
  90 void cx18_flush_queues(struct cx18_stream *s);
  91
  92 /* queue MDL reconfiguration helpers */
  93 void cx18_unload_queues(struct cx18_stream *s);
  94 void cx18_load_queues(struct cx18_stream *s);
  95
  96 /* cx18_stream utility functions */
  97 int cx18_stream_alloc(struct cx18_stream *s);
  98 void cx18_stream_free(struct cx18_stream *s);