drivers/staging/media/ipu3/ipu3-css-pool.h

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