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 	u16			reg;
44 	u32			enable;
45 
46 	struct ccu_mux_internal	mux;
47 	struct ccu_common	common;
48 };
49 
50 #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table,	\
51 				     _reg, _shift, _width, _gate,	\
52 				     _flags)				\
53 	struct ccu_mux _struct = {					\
54 		.enable	= _gate,					\
55 		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, _table),	\
56 		.common	= {						\
57 			.reg		= _reg,				\
58 			.hw.init	= CLK_HW_INIT_PARENTS(_name,	\
59 							      _parents, \
60 							      &ccu_mux_ops, \
61 							      _flags),	\
62 		}							\
63 	}
64 
65 #define SUNXI_CCU_MUX_WITH_GATE(_struct, _name, _parents, _reg,		\
66 				_shift, _width, _gate, _flags)		\
67 	SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL,	\
68 				      _reg, _shift, _width, _gate,	\
69 				      _flags)
70 
71 #define SUNXI_CCU_MUX(_struct, _name, _parents, _reg, _shift, _width,	\
72 		      _flags)						\
73 	SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL,	\
74 				      _reg, _shift, _width, 0, _flags)
75 
hw_to_ccu_mux(struct clk_hw * hw)76 static inline struct ccu_mux *hw_to_ccu_mux(struct clk_hw *hw)
77 {
78 	struct ccu_common *common = hw_to_ccu_common(hw);
79 
80 	return container_of(common, struct ccu_mux, common);
81 }
82 
83 extern const struct clk_ops ccu_mux_ops;
84 
85 unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
86 					  struct ccu_mux_internal *cm,
87 					  int parent_index,
88 					  unsigned long parent_rate);
89 int ccu_mux_helper_determine_rate(struct ccu_common *common,
90 				  struct ccu_mux_internal *cm,
91 				  struct clk_rate_request *req,
92 				  unsigned long (*round)(struct ccu_mux_internal *,
93 							 struct clk_hw *,
94 							 unsigned long *,
95 							 unsigned long,
96 							 void *),
97 				  void *data);
98 u8 ccu_mux_helper_get_parent(struct ccu_common *common,
99 			     struct ccu_mux_internal *cm);
100 int ccu_mux_helper_set_parent(struct ccu_common *common,
101 			      struct ccu_mux_internal *cm,
102 			      u8 index);
103 
104 struct ccu_mux_nb {
105 	struct notifier_block	clk_nb;
106 	struct ccu_common	*common;
107 	struct ccu_mux_internal	*cm;
108 
109 	u32	delay_us;	/* How many us to wait after reparenting */
110 	u8	bypass_index;	/* Which parent to temporarily use */
111 	u8	original_index;	/* This is set by the notifier callback */
112 };
113 
114 #define to_ccu_mux_nb(_nb) container_of(_nb, struct ccu_mux_nb, clk_nb)
115 
116 int ccu_mux_notifier_register(struct clk *clk, struct ccu_mux_nb *mux_nb);
117 
118 #endif /* _CCU_MUX_H_ */
119