1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _CCU_MUX_H_
3 #define _CCU_MUX_H_
4 
5 #include <linux/clk-provider.h>
6 
7 #include "ccu_common.h"
8 
9 struct ccu_mux_fixed_prediv {
10 	u8	index;
11 	u16	div;
12 };
13 
14 struct ccu_mux_var_prediv {
15 	u8	index;
16 	u8	shift;
17 	u8	width;
18 };
19 
20 struct ccu_mux_internal {
21 	u8		shift;
22 	u8		width;
23 	const u8	*table;
24 
25 	const struct ccu_mux_fixed_prediv	*fixed_predivs;
26 	u8		n_predivs;
27 
28 	const struct ccu_mux_var_prediv		*var_predivs;
29 	u8		n_var_predivs;
30 };
31 
32 #define _SUNXI_CCU_MUX_TABLE(_shift, _width, _table)	\
33 	{						\
34 		.shift	= _shift,			\
35 		.width	= _width,			\
36 		.table	= _table,			\
37 	}
38 
39 #define _SUNXI_CCU_MUX(_shift, _width) \
40 	_SUNXI_CCU_MUX_TABLE(_shift, _width, NULL)
41 
42 struct ccu_mux {
43 	u32			enable;
44 
45 	struct ccu_mux_internal	mux;
46 	struct ccu_common	common;
47 };
48 
49 #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table,	\
50 				     _reg, _shift, _width, _gate,	\
51 				     _flags)				\
52 	struct ccu_mux _struct = {					\
53 		.enable	= _gate,					\
54 		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, _table),	\
55 		.common	= {						\
56 			.reg		= _reg,				\
57 			.hw.init	= CLK_HW_INIT_PARENTS(_name,	\
58 							      _parents, \
59 							      &ccu_mux_ops, \
60 							      _flags),	\
61 		}							\
62 	}
63 
64 #define SUNXI_CCU_MUX_WITH_GATE(_struct, _name, _parents, _reg,		\
65 				_shift, _width, _gate, _flags)		\
66 	SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL,	\
67 				      _reg, _shift, _width, _gate,	\
68 				      _flags)
69 
70 #define SUNXI_CCU_MUX(_struct, _name, _parents, _reg, _shift, _width,	\
71 		      _flags)						\
72 	SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL,	\
73 				      _reg, _shift, _width, 0, _flags)
74 
75 #define SUNXI_CCU_MUX_DATA_WITH_GATE(_struct, _name, _parents, _reg,	\
76 				     _shift, _width, _gate, _flags)	\
77 	struct ccu_mux _struct = {					\
78 		.enable	= _gate,					\
79 		.mux	= _SUNXI_CCU_MUX(_shift, _width),		\
80 		.common	= {						\
81 			.reg		= _reg,				\
82 			.hw.init	= CLK_HW_INIT_PARENTS_DATA(_name, \
83 								   _parents, \
84 								   &ccu_mux_ops, \
85 								   _flags), \
86 		}							\
87 	}
88 
89 #define SUNXI_CCU_MUX_DATA(_struct, _name, _parents, _reg,		\
90 		      _shift, _width, _flags)				\
91 	SUNXI_CCU_MUX_DATA_WITH_GATE(_struct, _name, _parents, _reg,	\
92 				     _shift, _width, 0, _flags)
93 
94 #define SUNXI_CCU_MUX_HW_WITH_GATE(_struct, _name, _parents, _reg,	\
95 				   _shift, _width, _gate, _flags)	\
96 	struct ccu_mux _struct = {					\
97 		.enable	= _gate,					\
98 		.mux	= _SUNXI_CCU_MUX(_shift, _width),		\
99 		.common	= {						\
100 			.reg		= _reg,				\
101 			.hw.init	= CLK_HW_INIT_PARENTS_HW(_name, \
102 								 _parents, \
103 								 &ccu_mux_ops, \
104 								 _flags), \
105 		}							\
106 	}
107 
hw_to_ccu_mux(struct clk_hw * hw)108 static inline struct ccu_mux *hw_to_ccu_mux(struct clk_hw *hw)
109 {
110 	struct ccu_common *common = hw_to_ccu_common(hw);
111 
112 	return container_of(common, struct ccu_mux, common);
113 }
114 
115 extern const struct clk_ops ccu_mux_ops;
116 
117 unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
118 					  struct ccu_mux_internal *cm,
119 					  int parent_index,
120 					  unsigned long parent_rate);
121 int ccu_mux_helper_determine_rate(struct ccu_common *common,
122 				  struct ccu_mux_internal *cm,
123 				  struct clk_rate_request *req,
124 				  unsigned long (*round)(struct ccu_mux_internal *,
125 							 struct clk_hw *,
126 							 unsigned long *,
127 							 unsigned long,
128 							 void *),
129 				  void *data);
130 u8 ccu_mux_helper_get_parent(struct ccu_common *common,
131 			     struct ccu_mux_internal *cm);
132 int ccu_mux_helper_set_parent(struct ccu_common *common,
133 			      struct ccu_mux_internal *cm,
134 			      u8 index);
135 
136 struct ccu_mux_nb {
137 	struct notifier_block	clk_nb;
138 	struct ccu_common	*common;
139 	struct ccu_mux_internal	*cm;
140 
141 	u32	delay_us;	/* How many us to wait after reparenting */
142 	u8	bypass_index;	/* Which parent to temporarily use */
143 	u8	original_index;	/* This is set by the notifier callback */
144 };
145 
146 #define to_ccu_mux_nb(_nb) container_of(_nb, struct ccu_mux_nb, clk_nb)
147 
148 int ccu_mux_notifier_register(struct clk *clk, struct ccu_mux_nb *mux_nb);
149 
150 #endif /* _CCU_MUX_H_ */
151