ivtv-udma.h

linux内核源码

/*
    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
    Copyright (C) 2004  Chris Kennedy <[e-mail]>
    Copyright (C) 2006-2007  Hans Verkuil <[e-mail]>

    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_UDMA_H
#define IVTV_UDMA_H

/* User DMA functions */
void ivtv_udma_get_page_info(struct ivtv_dma_page_info *dma_page, unsigned long first, unsigned long size);
int ivtv_udma_fill_sg_list(struct ivtv_user_dma *dma, struct ivtv_dma_page_info *dma_page, int map_offset);
void ivtv_udma_fill_sg_array(struct ivtv_user_dma *dma, u32 buffer_offset, u32 buffer_offset_2, u32 split);
int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
		       void __user *userbuf, int size_in_bytes);
void ivtv_udma_unmap(struct ivtv *itv);
void ivtv_udma_free(struct ivtv *itv);
void ivtv_udma_alloc(struct ivtv *itv);
void ivtv_udma_prepare(struct ivtv *itv);
void ivtv_udma_start(struct ivtv *itv);

static inline void ivtv_udma_sync_for_device(struct ivtv *itv)
{
	pci_dma_sync_single_for_device((struct pci_dev *)itv->dev, itv->udma.SG_handle,
		sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE);
}

static inline void ivtv_udma_sync_for_cpu(struct ivtv *itv)
{
	pci_dma_sync_single_for_cpu((struct pci_dev *)itv->dev, itv->udma.SG_handle,
		sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE);
}

#endif