drivers/gpu/drm/msm/disp/dpu1/dpu_hw_blk.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
   3  */
   4
   5 #ifndef _DPU_HW_BLK_H
   6 #define _DPU_HW_BLK_H
   7
   8 #include <linux/types.h>
   9 #include <linux/list.h>
  10 #include <linux/atomic.h>
  11
  12 struct dpu_hw_blk;
  13
  14 /**
  15  * struct dpu_hw_blk_ops - common hardware block operations
  16  * @start: start operation on first get
  17  * @stop: stop operation on last put
  18  */
  19 struct dpu_hw_blk_ops {
  20         int (*start)(struct dpu_hw_blk *);
  21         void (*stop)(struct dpu_hw_blk *);
  22 };
  23
  24 /**
  25  * struct dpu_hw_blk - definition of hardware block object
  26  * @list: list of hardware blocks
  27  * @type: hardware block type
  28  * @id: instance id
  29  * @refcount: reference/usage count
  30  */
  31 struct dpu_hw_blk {
  32         struct list_head list;
  33         u32 type;
  34         int id;
  35         atomic_t refcount;
  36         struct dpu_hw_blk_ops ops;
  37 };
  38
  39 void dpu_hw_blk_init(struct dpu_hw_blk *hw_blk, u32 type, int id,
  40                 struct dpu_hw_blk_ops *ops);
  41 void dpu_hw_blk_destroy(struct dpu_hw_blk *hw_blk);
  42
  43 struct dpu_hw_blk *dpu_hw_blk_get(struct dpu_hw_blk *hw_blk, u32 type, int id);
  44 void dpu_hw_blk_put(struct dpu_hw_blk *hw_blk);
  45 #endif /*_DPU_HW_BLK_H */