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 */
46