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_WITH_GATE_KEY(_struct, _name, _parents, \
51 _reg, _shift, _width, \
52 _key_value, _gate, _flags) \
53 struct ccu_mux _struct = { \
54 .enable = _gate, \
55 .mux = _SUNXI_CCU_MUX(_shift, _width), \
56 .common = { \
57 .reg = _reg, \
58 .features = CCU_FEATURE_KEY_FIELD_MOD, \
59 .key_value = _key_value, \
60 .hw.init = CLK_HW_INIT_PARENTS(_name, \
61 _parents, \
62 &ccu_mux_ops, \
63 _flags), \
64 } \
65 }
66
67 #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table, \
68 _reg, _shift, _width, _gate, \
69 _flags) \
70 struct ccu_mux _struct = { \
71 .enable = _gate, \
72 .mux = _SUNXI_CCU_MUX_TABLE(_shift, _width, _table), \
73 .common = { \
74 .reg = _reg, \
75 .hw.init = CLK_HW_INIT_PARENTS(_name, \
76 _parents, \
77 &ccu_mux_ops, \
78 _flags), \
79 } \
80 }
81
82 #define SUNXI_CCU_MUX_WITH_GATE(_struct, _name, _parents, _reg, \
83 _shift, _width, _gate, _flags) \
84 SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL, \
85 _reg, _shift, _width, _gate, \
86 _flags)
87
88 #define SUNXI_CCU_MUX(_struct, _name, _parents, _reg, _shift, _width, \
89 _flags) \
90 SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL, \
91 _reg, _shift, _width, 0, _flags)
92
hw_to_ccu_mux(struct clk_hw * hw)93 static inline struct ccu_mux *hw_to_ccu_mux(struct clk_hw *hw)
94 {
95 struct ccu_common *common = hw_to_ccu_common(hw);
96
97 return container_of(common, struct ccu_mux, common);
98 }
99
100 extern const struct clk_ops ccu_mux_ops;
101
102 unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
103 struct ccu_mux_internal *cm,
104 int parent_index,
105 unsigned long parent_rate);
106 int ccu_mux_helper_determine_rate(struct ccu_common *common,
107 struct ccu_mux_internal *cm,
108 struct clk_rate_request *req,
109 unsigned long (*round)(struct ccu_mux_internal *,
110 struct clk_hw *,
111 unsigned long *,
112 unsigned long,
113 void *),
114 void *data);
115 u8 ccu_mux_helper_get_parent(struct ccu_common *common,
116 struct ccu_mux_internal *cm);
117 int ccu_mux_helper_set_parent(struct ccu_common *common,
118 struct ccu_mux_internal *cm,
119 u8 index);
120
121 struct ccu_mux_nb {
122 struct notifier_block clk_nb;
123 struct ccu_common *common;
124 struct ccu_mux_internal *cm;
125
126 u32 delay_us; /* How many us to wait after reparenting */
127 u8 bypass_index; /* Which parent to temporarily use */
128 u8 original_index; /* This is set by the notifier callback */
129 };
130
131 #define to_ccu_mux_nb(_nb) container_of(_nb, struct ccu_mux_nb, clk_nb)
132
133 int ccu_mux_notifier_register(struct clk *clk, struct ccu_mux_nb *mux_nb);
134
135 #endif /* _CCU_MUX_H_ */
136