drivers/media/pci/cobalt/cobalt-omnitek.h

   1 /*
   2  *  Omnitek Scatter-Gather DMA Controller
   3  *
   4  *  Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates.
   5  *  All rights reserved.
   6  *
   7  *  This program is free software; you may redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  12  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  13  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  14  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  15  *  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  16  *  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  17  *  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  18  *  SOFTWARE.
  19  */
  20
  21 #ifndef COBALT_OMNITEK_H
  22 #define COBALT_OMNITEK_H
  23
  24 #include <linux/scatterlist.h>
  25 #include "cobalt-driver.h"
  26
  27 struct sg_dma_descriptor {
  28         u32 pci_l;
  29         u32 pci_h;
  30
  31         u32 local;
  32         u32 reserved0;
  33
  34         u32 next_l;
  35         u32 next_h;
  36
  37         u32 bytes;
  38         u32 reserved1;
  39 };
  40
  41 int omni_sg_dma_init(struct cobalt *cobalt);
  42 void omni_sg_dma_abort_channel(struct cobalt_stream *s);
  43 void omni_sg_dma_start(struct cobalt_stream *s, struct sg_dma_desc_info *desc);
  44 bool is_dma_done(struct cobalt_stream *s);
  45
  46 int descriptor_list_create(struct cobalt *cobalt,
  47         struct scatterlist *scatter_list, bool to_pci, unsigned sglen,
  48         unsigned size, unsigned width, unsigned stride,
  49         struct sg_dma_desc_info *desc);
  50
  51 void descriptor_list_chain(struct sg_dma_desc_info *this,
  52                            struct sg_dma_desc_info *next);
  53 void descriptor_list_loopback(struct sg_dma_desc_info *desc);
  54 void descriptor_list_end_of_chain(struct sg_dma_desc_info *desc);
  55
  56 void *descriptor_list_allocate(struct sg_dma_desc_info *desc, size_t bytes);
  57 void descriptor_list_free(struct sg_dma_desc_info *desc);
  58
  59 void descriptor_list_interrupt_enable(struct sg_dma_desc_info *desc);
  60 void descriptor_list_interrupt_disable(struct sg_dma_desc_info *desc);
  61
  62 #endif