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
  20 #define CX18_DMA_UNMAPPED       ((u32) -1)
  21
  22 /* cx18_buffer utility functions */
  23
  24 static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
  25         struct cx18_buffer *buf)
  26 {
  27         pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle,
  28                                 s->buf_size, s->dma);
  29 }
  30
  31 static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
  32         struct cx18_buffer *buf)
  33 {
  34         pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle,
  35                                 s->buf_size, s->dma);
  36 }
  37
  38 void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
  39
  40 static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
  41                                             struct cx18_mdl *mdl)
  42 {
  43         if (list_is_singular(&mdl->buf_list))
  44                 cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
  45                                                              struct cx18_buffer,
  46                                                              list));
  47         else
  48                 _cx18_mdl_sync_for_device(s, mdl);
  49 }
  50
  51 void cx18_buf_swap(struct cx18_buffer *buf);
  52 void _cx18_mdl_swap(struct cx18_mdl *mdl);
  53
  54 static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
  55 {
  56         if (list_is_singular(&mdl->buf_list))
  57                 cx18_buf_swap(list_first_entry(&mdl->buf_list,
  58                                                struct cx18_buffer, list));
  59         else
  60                 _cx18_mdl_swap(mdl);
  61 }
  62
  63 /* cx18_queue utility functions */
  64 struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
  65                                  struct cx18_queue *q, int to_front);
  66
  67 static inline
  68 struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
  69                                 struct cx18_queue *q)
  70 {
  71         return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
  72 }
  73
  74 static inline
  75 struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
  76                              struct cx18_queue *q)
  77 {
  78         return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
  79 }
  80
  81 void cx18_queue_init(struct cx18_queue *q);
  82 struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
  83 struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
  84         u32 bytesused);
  85 void cx18_flush_queues(struct cx18_stream *s);
  86
  87 /* queue MDL reconfiguration helpers */
  88 void cx18_unload_queues(struct cx18_stream *s);
  89 void cx18_load_queues(struct cx18_stream *s);
  90
  91 /* cx18_stream utility functions */
  92 int cx18_stream_alloc(struct cx18_stream *s);
  93 void cx18_stream_free(struct cx18_stream *s);