1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2018 Intel Corporation */
3
4 #ifndef __IPU3_UTIL_H
5 #define __IPU3_UTIL_H
6
7 struct device;
8 struct imgu_device;
9
10 #define IPU3_CSS_POOL_SIZE 4
11
12 /**
13 * imgu_css_map - store DMA mapping info for buffer
14 *
15 * @size: size of the buffer in bytes.
16 * @vaddr: kernel virtual address.
17 * @daddr: iova dma address to access IPU3.
18 * @vma: private, a pointer to &struct vm_struct,
19 * used for imgu_dmamap_free.
20 */
21 struct imgu_css_map {
22 size_t size;
23 void *vaddr;
24 dma_addr_t daddr;
25 struct vm_struct *vma;
26 };
27
28 /**
29 * imgu_css_pool - circular buffer pool definition
30 *
31 * @entry: array with IPU3_CSS_POOL_SIZE elements.
32 * @entry.param: a &struct imgu_css_map for storing the mem mapping.
33 * @entry.valid: used to mark if the entry has valid data.
34 * @last: write pointer, initialized to IPU3_CSS_POOL_SIZE.
35 */
36 struct imgu_css_pool {
37 struct {
38 struct imgu_css_map param;
39 bool valid;
40 } entry[IPU3_CSS_POOL_SIZE];
41 u32 last;
42 };
43
44 int imgu_css_dma_buffer_resize(struct imgu_device *imgu,
45 struct imgu_css_map *map, size_t size);
46 void imgu_css_pool_cleanup(struct imgu_device *imgu,
47 struct imgu_css_pool *pool);
48 int imgu_css_pool_init(struct imgu_device *imgu, struct imgu_css_pool *pool,
49 size_t size);
50 void imgu_css_pool_get(struct imgu_css_pool *pool);
51 void imgu_css_pool_put(struct imgu_css_pool *pool);
52 const struct imgu_css_map *imgu_css_pool_last(struct imgu_css_pool *pool,
53 u32 last);
54
55 #endif