1 /* SPDX-License-Identifier: GPL-2.0 */
2 //
3 // Spreadtrum divider clock driver
4 //
5 // Copyright (C) 2017 Spreadtrum, Inc.
6 // Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
7 
8 #ifndef _SPRD_DIV_H_
9 #define _SPRD_DIV_H_
10 
11 #include "common.h"
12 
13 /**
14  * struct sprd_div_internal - Internal divider description
15  * @shift: Bit offset of the divider in its register
16  * @width: Width of the divider field in its register
17  *
18  * That structure represents a single divider, and is meant to be
19  * embedded in other structures representing the various clock
20  * classes.
21  */
22 struct sprd_div_internal {
23 	u8	shift;
24 	u8	width;
25 };
26 
27 #define _SPRD_DIV_CLK(_shift, _width)	\
28 	{				\
29 		.shift	= _shift,	\
30 		.width	= _width,	\
31 	}
32 
33 struct sprd_div {
34 	struct sprd_div_internal	div;
35 	struct sprd_clk_common	common;
36 };
37 
38 #define SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg,		\
39 				_shift, _width, _flags, _fn)		\
40 	struct sprd_div _struct = {					\
41 		.div	= _SPRD_DIV_CLK(_shift, _width),		\
42 		.common	= {						\
43 			.regmap		= NULL,				\
44 			.reg		= _reg,				\
45 			.hw.init	= _fn(_name, _parent,		\
46 					      &sprd_div_ops, _flags),	\
47 		}							\
48 	}
49 
50 #define SPRD_DIV_CLK(_struct, _name, _parent, _reg,			\
51 		     _shift, _width, _flags)				\
52 	SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg,		\
53 				_shift, _width, _flags, CLK_HW_INIT)
54 
55 #define SPRD_DIV_CLK_HW(_struct, _name, _parent, _reg,			\
56 			_shift, _width, _flags)				\
57 	SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg,		\
58 				_shift, _width, _flags, CLK_HW_INIT_HW)
59 
hw_to_sprd_div(const struct clk_hw * hw)60 static inline struct sprd_div *hw_to_sprd_div(const struct clk_hw *hw)
61 {
62 	struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
63 
64 	return container_of(common, struct sprd_div, common);
65 }
66 
67 long sprd_div_helper_round_rate(struct sprd_clk_common *common,
68 				const struct sprd_div_internal *div,
69 				unsigned long rate,
70 				unsigned long *parent_rate);
71 
72 unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common,
73 					  const struct sprd_div_internal *div,
74 					  unsigned long parent_rate);
75 
76 int sprd_div_helper_set_rate(const struct sprd_clk_common *common,
77 			     const struct sprd_div_internal *div,
78 			     unsigned long rate,
79 			     unsigned long parent_rate);
80 
81 extern const struct clk_ops sprd_div_ops;
82 
83 #endif /* _SPRD_DIV_H_ */
84