ivtv-queue.h
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/*
buffer queues.
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2004 Chris Kennedy <c@groovy.org>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef IVTV_QUEUE_H
#define IVTV_QUEUE_H
#define IVTV_DMA_UNMAPPED ((u32) -1)
#define SLICED_VBI_PIO 0
/* ivtv_buffer utility functions */
static inline int ivtv_might_use_pio(struct ivtv_stream *s)
{
return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
}
static inline int ivtv_use_pio(struct ivtv_stream *s)
{
struct ivtv *itv = s->itv;
return s->dma == PCI_DMA_NONE ||
(SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
}
static inline int ivtv_might_use_dma(struct ivtv_stream *s)
{
return s->dma != PCI_DMA_NONE;
}
static inline int ivtv_use_dma(struct ivtv_stream *s)
{
return !ivtv_use_pio(s);
}
static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
{
if (ivtv_use_dma(s))
pci_dma_sync_single_for_cpu(s->itv->pdev, buf->dma_handle,
s->buf_size + 256, s->dma);
}
static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
{
if (ivtv_use_dma(s))
pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle,
s->buf_size + 256, s->dma);
}
int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
void ivtv_buf_swap(struct ivtv_buffer *buf);
/* ivtv_queue utility functions */
void ivtv_queue_init(struct ivtv_queue *q);
void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
struct ivtv_queue *to, int needed_bytes);
void ivtv_flush_queues(struct ivtv_stream *s);
/* ivtv_stream utility functions */
int ivtv_stream_alloc(struct ivtv_stream *s);
void ivtv_stream_free(struct ivtv_stream *s);
static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
{
if (ivtv_use_dma(s))
pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle,
sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
}
static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
{
if (ivtv_use_dma(s))
pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle,
sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
}
#endif