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 * struct 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 * @pages: pages mapped to this buffer 19 */ 20 struct imgu_css_map { 21 size_t size; 22 void *vaddr; 23 dma_addr_t daddr; 24 struct page **pages; 25 }; 26 27 /** 28 * struct imgu_css_pool - circular buffer pool definition 29 * 30 * @entry: array with IPU3_CSS_POOL_SIZE elements. 31 * @entry.param: a &struct imgu_css_map for storing the mem mapping. 32 * @entry.valid: used to mark if the entry has valid data. 33 * @last: write pointer, initialized to IPU3_CSS_POOL_SIZE. 34 */ 35 struct imgu_css_pool { 36 struct { 37 struct imgu_css_map param; 38 bool valid; 39 } entry[IPU3_CSS_POOL_SIZE]; 40 u32 last; 41 }; 42 43 int imgu_css_dma_buffer_resize(struct imgu_device *imgu, 44 struct imgu_css_map *map, size_t size); 45 void imgu_css_pool_cleanup(struct imgu_device *imgu, 46 struct imgu_css_pool *pool); 47 int imgu_css_pool_init(struct imgu_device *imgu, struct imgu_css_pool *pool, 48 size_t size); 49 void imgu_css_pool_get(struct imgu_css_pool *pool); 50 void imgu_css_pool_put(struct imgu_css_pool *pool); 51 const struct imgu_css_map *imgu_css_pool_last(struct imgu_css_pool *pool, 52 u32 last); 53 54 #endif 55