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

   1 /* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #ifndef _DPU_HW_BLK_H
  14 #define _DPU_HW_BLK_H
  15
  16 #include <linux/types.h>
  17 #include <linux/list.h>
  18 #include <linux/atomic.h>
  19
  20 struct dpu_hw_blk;
  21
  22 /**
  23  * struct dpu_hw_blk_ops - common hardware block operations
  24  * @start: start operation on first get
  25  * @stop: stop operation on last put
  26  */
  27 struct dpu_hw_blk_ops {
  28         int (*start)(struct dpu_hw_blk *);
  29         void (*stop)(struct dpu_hw_blk *);
  30 };
  31
  32 /**
  33  * struct dpu_hw_blk - definition of hardware block object
  34  * @list: list of hardware blocks
  35  * @type: hardware block type
  36  * @id: instance id
  37  * @refcount: reference/usage count
  38  */
  39 struct dpu_hw_blk {
  40         struct list_head list;
  41         u32 type;
  42         int id;
  43         atomic_t refcount;
  44         struct dpu_hw_blk_ops ops;
  45 };
  46
  47 void dpu_hw_blk_init(struct dpu_hw_blk *hw_blk, u32 type, int id,
  48                 struct dpu_hw_blk_ops *ops);
  49 void dpu_hw_blk_destroy(struct dpu_hw_blk *hw_blk);
  50
  51 struct dpu_hw_blk *dpu_hw_blk_get(struct dpu_hw_blk *hw_blk, u32 type, int id);
  52 void dpu_hw_blk_put(struct dpu_hw_blk *hw_blk);
  53 #endif /*_DPU_HW_BLK_H */