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61fc4131 PZ |
1 | #ifndef _LINUX_RESET_H_ |
2 | #define _LINUX_RESET_H_ | |
3 | ||
6c96f05c HG |
4 | #include <linux/device.h> |
5 | ||
61fc4131 PZ |
6 | struct reset_control; |
7 | ||
b424080a PZ |
8 | #ifdef CONFIG_RESET_CONTROLLER |
9 | ||
61fc4131 PZ |
10 | int reset_control_reset(struct reset_control *rstc); |
11 | int reset_control_assert(struct reset_control *rstc); | |
12 | int reset_control_deassert(struct reset_control *rstc); | |
729de41b | 13 | int reset_control_status(struct reset_control *rstc); |
61fc4131 | 14 | |
6c96f05c | 15 | struct reset_control *__of_reset_control_get(struct device_node *node, |
0b52297f | 16 | const char *id, int index, int shared); |
61fc4131 | 17 | void reset_control_put(struct reset_control *rstc); |
6c96f05c | 18 | struct reset_control *__devm_reset_control_get(struct device *dev, |
0b52297f | 19 | const char *id, int index, int shared); |
61fc4131 | 20 | |
b424080a PZ |
21 | int __must_check device_reset(struct device *dev); |
22 | ||
23 | static inline int device_reset_optional(struct device *dev) | |
24 | { | |
25 | return device_reset(dev); | |
26 | } | |
27 | ||
b424080a PZ |
28 | #else |
29 | ||
30 | static inline int reset_control_reset(struct reset_control *rstc) | |
31 | { | |
32 | WARN_ON(1); | |
33 | return 0; | |
34 | } | |
35 | ||
36 | static inline int reset_control_assert(struct reset_control *rstc) | |
37 | { | |
38 | WARN_ON(1); | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static inline int reset_control_deassert(struct reset_control *rstc) | |
43 | { | |
44 | WARN_ON(1); | |
45 | return 0; | |
46 | } | |
47 | ||
729de41b DN |
48 | static inline int reset_control_status(struct reset_control *rstc) |
49 | { | |
50 | WARN_ON(1); | |
51 | return 0; | |
52 | } | |
53 | ||
b424080a PZ |
54 | static inline void reset_control_put(struct reset_control *rstc) |
55 | { | |
56 | WARN_ON(1); | |
57 | } | |
58 | ||
41136522 DL |
59 | static inline int __must_check device_reset(struct device *dev) |
60 | { | |
61 | WARN_ON(1); | |
62 | return -ENOTSUPP; | |
63 | } | |
64 | ||
b424080a PZ |
65 | static inline int device_reset_optional(struct device *dev) |
66 | { | |
39b4da71 | 67 | return -ENOTSUPP; |
b424080a PZ |
68 | } |
69 | ||
6c96f05c HG |
70 | static inline struct reset_control *__of_reset_control_get( |
71 | struct device_node *node, | |
0b52297f | 72 | const char *id, int index, int shared) |
5bcd0b7f | 73 | { |
5bcd0b7f AL |
74 | return ERR_PTR(-EINVAL); |
75 | } | |
76 | ||
6c96f05c HG |
77 | static inline struct reset_control *__devm_reset_control_get( |
78 | struct device *dev, | |
0b52297f | 79 | const char *id, int index, int shared) |
5bcd0b7f | 80 | { |
5bcd0b7f AL |
81 | return ERR_PTR(-EINVAL); |
82 | } | |
83 | ||
6c96f05c HG |
84 | #endif /* CONFIG_RESET_CONTROLLER */ |
85 | ||
86 | /** | |
0b52297f HG |
87 | * reset_control_get - Lookup and obtain an exclusive reference to a |
88 | * reset controller. | |
6c96f05c HG |
89 | * @dev: device to be reset by the controller |
90 | * @id: reset line name | |
91 | * | |
92 | * Returns a struct reset_control or IS_ERR() condition containing errno. | |
0b52297f HG |
93 | * If this function is called more then once for the same reset_control it will |
94 | * return -EBUSY. | |
95 | * | |
96 | * See reset_control_get_shared for details on shared references to | |
97 | * reset-controls. | |
6c96f05c HG |
98 | * |
99 | * Use of id names is optional. | |
100 | */ | |
101 | static inline struct reset_control *__must_check reset_control_get( | |
b424080a PZ |
102 | struct device *dev, const char *id) |
103 | { | |
6c96f05c HG |
104 | #ifndef CONFIG_RESET_CONTROLLER |
105 | WARN_ON(1); | |
106 | #endif | |
0b52297f | 107 | return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 0); |
b424080a PZ |
108 | } |
109 | ||
6c96f05c | 110 | static inline struct reset_control *reset_control_get_optional( |
b424080a PZ |
111 | struct device *dev, const char *id) |
112 | { | |
0b52297f | 113 | return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 0); |
b424080a PZ |
114 | } |
115 | ||
6c96f05c | 116 | /** |
0b52297f HG |
117 | * reset_control_get_shared - Lookup and obtain a shared reference to a |
118 | * reset controller. | |
119 | * @dev: device to be reset by the controller | |
120 | * @id: reset line name | |
121 | * | |
122 | * Returns a struct reset_control or IS_ERR() condition containing errno. | |
123 | * This function is intended for use with reset-controls which are shared | |
124 | * between hardware-blocks. | |
125 | * | |
126 | * When a reset-control is shared, the behavior of reset_control_assert / | |
127 | * deassert is changed, the reset-core will keep track of a deassert_count | |
128 | * and only (re-)assert the reset after reset_control_assert has been called | |
129 | * as many times as reset_control_deassert was called. Also see the remark | |
130 | * about shared reset-controls in the reset_control_assert docs. | |
131 | * | |
132 | * Calling reset_control_assert without first calling reset_control_deassert | |
133 | * is not allowed on a shared reset control. Calling reset_control_reset is | |
134 | * also not allowed on a shared reset control. | |
135 | * | |
136 | * Use of id names is optional. | |
137 | */ | |
138 | static inline struct reset_control *reset_control_get_shared( | |
139 | struct device *dev, const char *id) | |
140 | { | |
141 | return __of_reset_control_get(dev ? dev->of_node : NULL, id, 0, 1); | |
142 | } | |
143 | ||
144 | /** | |
145 | * of_reset_control_get - Lookup and obtain an exclusive reference to a | |
146 | * reset controller. | |
6c96f05c HG |
147 | * @node: device to be reset by the controller |
148 | * @id: reset line name | |
149 | * | |
150 | * Returns a struct reset_control or IS_ERR() condition containing errno. | |
151 | * | |
152 | * Use of id names is optional. | |
153 | */ | |
e3ec0a8c HG |
154 | static inline struct reset_control *of_reset_control_get( |
155 | struct device_node *node, const char *id) | |
156 | { | |
0b52297f | 157 | return __of_reset_control_get(node, id, 0, 0); |
e3ec0a8c HG |
158 | } |
159 | ||
6c96f05c | 160 | /** |
0b52297f HG |
161 | * of_reset_control_get_by_index - Lookup and obtain an exclusive reference to |
162 | * a reset controller by index. | |
6c96f05c HG |
163 | * @node: device to be reset by the controller |
164 | * @index: index of the reset controller | |
165 | * | |
166 | * This is to be used to perform a list of resets for a device or power domain | |
167 | * in whatever order. Returns a struct reset_control or IS_ERR() condition | |
168 | * containing errno. | |
169 | */ | |
c0a13aa6 | 170 | static inline struct reset_control *of_reset_control_get_by_index( |
6c96f05c | 171 | struct device_node *node, int index) |
c0a13aa6 | 172 | { |
0b52297f | 173 | return __of_reset_control_get(node, NULL, index, 0); |
c0a13aa6 VH |
174 | } |
175 | ||
6c96f05c HG |
176 | /** |
177 | * devm_reset_control_get - resource managed reset_control_get() | |
178 | * @dev: device to be reset by the controller | |
179 | * @id: reset line name | |
180 | * | |
181 | * Managed reset_control_get(). For reset controllers returned from this | |
182 | * function, reset_control_put() is called automatically on driver detach. | |
183 | * See reset_control_get() for more information. | |
184 | */ | |
185 | static inline struct reset_control *__must_check devm_reset_control_get( | |
186 | struct device *dev, const char *id) | |
187 | { | |
188 | #ifndef CONFIG_RESET_CONTROLLER | |
189 | WARN_ON(1); | |
190 | #endif | |
0b52297f | 191 | return __devm_reset_control_get(dev, id, 0, 0); |
6c96f05c HG |
192 | } |
193 | ||
194 | static inline struct reset_control *devm_reset_control_get_optional( | |
195 | struct device *dev, const char *id) | |
196 | { | |
0b52297f | 197 | return __devm_reset_control_get(dev, id, 0, 0); |
6c96f05c HG |
198 | } |
199 | ||
200 | /** | |
201 | * devm_reset_control_get_by_index - resource managed reset_control_get | |
202 | * @dev: device to be reset by the controller | |
203 | * @index: index of the reset controller | |
204 | * | |
205 | * Managed reset_control_get(). For reset controllers returned from this | |
206 | * function, reset_control_put() is called automatically on driver detach. | |
207 | * See reset_control_get() for more information. | |
208 | */ | |
209 | static inline struct reset_control *devm_reset_control_get_by_index( | |
210 | struct device *dev, int index) | |
211 | { | |
0b52297f HG |
212 | return __devm_reset_control_get(dev, NULL, index, 0); |
213 | } | |
214 | ||
215 | /** | |
216 | * devm_reset_control_get_shared - resource managed reset_control_get_shared() | |
217 | * @dev: device to be reset by the controller | |
218 | * @id: reset line name | |
219 | * | |
220 | * Managed reset_control_get_shared(). For reset controllers returned from | |
221 | * this function, reset_control_put() is called automatically on driver detach. | |
222 | * See reset_control_get_shared() for more information. | |
223 | */ | |
224 | static inline struct reset_control *devm_reset_control_get_shared( | |
225 | struct device *dev, const char *id) | |
226 | { | |
227 | return __devm_reset_control_get(dev, id, 0, 1); | |
228 | } | |
229 | ||
230 | /** | |
231 | * devm_reset_control_get_shared_by_index - resource managed | |
232 | * reset_control_get_shared | |
233 | * @dev: device to be reset by the controller | |
234 | * @index: index of the reset controller | |
235 | * | |
236 | * Managed reset_control_get_shared(). For reset controllers returned from | |
237 | * this function, reset_control_put() is called automatically on driver detach. | |
238 | * See reset_control_get_shared() for more information. | |
239 | */ | |
240 | static inline struct reset_control *devm_reset_control_get_shared_by_index( | |
241 | struct device *dev, int index) | |
242 | { | |
243 | return __devm_reset_control_get(dev, NULL, index, 1); | |
6c96f05c | 244 | } |
61fc4131 PZ |
245 | |
246 | #endif |