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
27struct 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
41int omni_sg_dma_init(struct cobalt *cobalt);
42void omni_sg_dma_abort_channel(struct cobalt_stream *s);
43void omni_sg_dma_start(struct cobalt_stream *s, struct sg_dma_desc_info *desc);
44bool is_dma_done(struct cobalt_stream *s);
45
46int 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
51void descriptor_list_chain(struct sg_dma_desc_info *this,
52			   struct sg_dma_desc_info *next);
53void descriptor_list_loopback(struct sg_dma_desc_info *desc);
54void descriptor_list_end_of_chain(struct sg_dma_desc_info *desc);
55
56void *descriptor_list_allocate(struct sg_dma_desc_info *desc, size_t bytes);
57void descriptor_list_free(struct sg_dma_desc_info *desc);
58
59void descriptor_list_interrupt_enable(struct sg_dma_desc_info *desc);
60void descriptor_list_interrupt_disable(struct sg_dma_desc_info *desc);
61
62#endif
63