1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * machine.h -- SoC Regulator support, machine/board driver API.
4 *
5 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
6 *
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 * Regulator Machine/Board Interface.
10 */
11
12 #ifndef __LINUX_REGULATOR_MACHINE_H_
13 #define __LINUX_REGULATOR_MACHINE_H_
14
15 #include <linux/regulator/consumer.h>
16 #include <linux/suspend.h>
17
18 struct regulator;
19
20 /*
21 * Regulator operation constraint flags. These flags are used to enable
22 * certain regulator operations and can be OR'ed together.
23 *
24 * VOLTAGE: Regulator output voltage can be changed by software on this
25 * board/machine.
26 * CURRENT: Regulator output current can be changed by software on this
27 * board/machine.
28 * MODE: Regulator operating mode can be changed by software on this
29 * board/machine.
30 * STATUS: Regulator can be enabled and disabled.
31 * DRMS: Dynamic Regulator Mode Switching is enabled for this regulator.
32 * BYPASS: Regulator can be put into bypass mode
33 */
34
35 #define REGULATOR_CHANGE_VOLTAGE 0x1
36 #define REGULATOR_CHANGE_CURRENT 0x2
37 #define REGULATOR_CHANGE_MODE 0x4
38 #define REGULATOR_CHANGE_STATUS 0x8
39 #define REGULATOR_CHANGE_DRMS 0x10
40 #define REGULATOR_CHANGE_BYPASS 0x20
41
42 /*
43 * operations in suspend mode
44 * DO_NOTHING_IN_SUSPEND - the default value
45 * DISABLE_IN_SUSPEND - turn off regulator in suspend states
46 * ENABLE_IN_SUSPEND - keep regulator on in suspend states
47 */
48 #define DO_NOTHING_IN_SUSPEND 0
49 #define DISABLE_IN_SUSPEND 1
50 #define ENABLE_IN_SUSPEND 2
51
52 /* Regulator active discharge flags */
53 enum regulator_active_discharge {
54 REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
55 REGULATOR_ACTIVE_DISCHARGE_DISABLE,
56 REGULATOR_ACTIVE_DISCHARGE_ENABLE,
57 };
58
59 /**
60 * struct regulator_state - regulator state during low power system states
61 *
62 * This describes a regulators state during a system wide low power
63 * state. One of enabled or disabled must be set for the
64 * configuration to be applied.
65 *
66 * @uV: Default operating voltage during suspend, it can be adjusted
67 * among <min_uV, max_uV>.
68 * @min_uV: Minimum suspend voltage may be set.
69 * @max_uV: Maximum suspend voltage may be set.
70 * @mode: Operating mode during suspend.
71 * @enabled: operations during suspend.
72 * - DO_NOTHING_IN_SUSPEND
73 * - DISABLE_IN_SUSPEND
74 * - ENABLE_IN_SUSPEND
75 * @changeable: Is this state can be switched between enabled/disabled,
76 */
77 struct regulator_state {
78 int uV;
79 int min_uV;
80 int max_uV;
81 unsigned int mode;
82 int enabled;
83 bool changeable;
84 };
85
86 /**
87 * struct regulation_constraints - regulator operating constraints.
88 *
89 * This struct describes regulator and board/machine specific constraints.
90 *
91 * @name: Descriptive name for the constraints, used for display purposes.
92 *
93 * @min_uV: Smallest voltage consumers may set.
94 * @max_uV: Largest voltage consumers may set.
95 * @uV_offset: Offset applied to voltages from consumer to compensate for
96 * voltage drops.
97 *
98 * @min_uA: Smallest current consumers may set.
99 * @max_uA: Largest current consumers may set.
100 * @ilim_uA: Maximum input current.
101 * @system_load: Load that isn't captured by any consumer requests.
102 *
103 * @max_spread: Max possible spread between coupled regulators
104 * @valid_modes_mask: Mask of modes which may be configured by consumers.
105 * @valid_ops_mask: Operations which may be performed by consumers.
106 *
107 * @always_on: Set if the regulator should never be disabled.
108 * @boot_on: Set if the regulator is enabled when the system is initially
109 * started. If the regulator is not enabled by the hardware or
110 * bootloader then it will be enabled when the constraints are
111 * applied.
112 * @apply_uV: Apply the voltage constraint when initialising.
113 * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
114 * @soft_start: Enable soft start so that voltage ramps slowly.
115 * @pull_down: Enable pull down when regulator is disabled.
116 * @over_current_protection: Auto disable on over current event.
117 *
118 * @input_uV: Input voltage for regulator when supplied by another regulator.
119 *
120 * @state_disk: State for regulator when system is suspended in disk mode.
121 * @state_mem: State for regulator when system is suspended in mem mode.
122 * @state_standby: State for regulator when system is suspended in standby
123 * mode.
124 * @initial_state: Suspend state to set by default.
125 * @initial_mode: Mode to set at startup.
126 * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
127 * @settling_time: Time to settle down after voltage change when voltage
128 * change is non-linear (unit: microseconds).
129 * @settling_time_up: Time to settle down after voltage increase when voltage
130 * change is non-linear (unit: microseconds).
131 * @settling_time_down : Time to settle down after voltage decrease when
132 * voltage change is non-linear (unit: microseconds).
133 * @active_discharge: Enable/disable active discharge. The enum
134 * regulator_active_discharge values are used for
135 * initialisation.
136 * @enable_time: Turn-on time of the rails (unit: microseconds)
137 */
138 struct regulation_constraints {
139
140 const char *name;
141
142 /* voltage output range (inclusive) - for voltage control */
143 int min_uV;
144 int max_uV;
145
146 int uV_offset;
147
148 /* current output range (inclusive) - for current control */
149 int min_uA;
150 int max_uA;
151 int ilim_uA;
152
153 int system_load;
154
155 /* used for coupled regulators */
156 u32 *max_spread;
157
158 /* used for changing voltage in steps */
159 int max_uV_step;
160
161 /* valid regulator operating modes for this machine */
162 unsigned int valid_modes_mask;
163
164 /* valid operations for regulator on this machine */
165 unsigned int valid_ops_mask;
166
167 /* regulator input voltage - only if supply is another regulator */
168 int input_uV;
169
170 /* regulator suspend states for global PMIC STANDBY/HIBERNATE */
171 struct regulator_state state_disk;
172 struct regulator_state state_mem;
173 struct regulator_state state_standby;
174 suspend_state_t initial_state; /* suspend state to set at init */
175
176 /* mode to set on startup */
177 unsigned int initial_mode;
178
179 unsigned int ramp_delay;
180 unsigned int settling_time;
181 unsigned int settling_time_up;
182 unsigned int settling_time_down;
183 unsigned int enable_time;
184
185 unsigned int active_discharge;
186
187 /* constraint flags */
188 unsigned always_on:1; /* regulator never off when system is on */
189 unsigned boot_on:1; /* bootloader/firmware enabled regulator */
190 unsigned apply_uV:1; /* apply uV constraint if min == max */
191 unsigned ramp_disable:1; /* disable ramp delay */
192 unsigned soft_start:1; /* ramp voltage slowly */
193 unsigned pull_down:1; /* pull down resistor when regulator off */
194 unsigned over_current_protection:1; /* auto disable on over current */
195 };
196
197 /**
198 * struct regulator_consumer_supply - supply -> device mapping
199 *
200 * This maps a supply name to a device. Use of dev_name allows support for
201 * buses which make struct device available late such as I2C.
202 *
203 * @dev_name: Result of dev_name() for the consumer.
204 * @supply: Name for the supply.
205 */
206 struct regulator_consumer_supply {
207 const char *dev_name; /* dev_name() for consumer */
208 const char *supply; /* consumer supply - e.g. "vcc" */
209 };
210
211 /* Initialize struct regulator_consumer_supply */
212 #define REGULATOR_SUPPLY(_name, _dev_name) \
213 { \
214 .supply = _name, \
215 .dev_name = _dev_name, \
216 }
217
218 /**
219 * struct regulator_init_data - regulator platform initialisation data.
220 *
221 * Initialisation constraints, our supply and consumers supplies.
222 *
223 * @supply_regulator: Parent regulator. Specified using the regulator name
224 * as it appears in the name field in sysfs, which can
225 * be explicitly set using the constraints field 'name'.
226 *
227 * @constraints: Constraints. These must be specified for the regulator to
228 * be usable.
229 * @num_consumer_supplies: Number of consumer device supplies.
230 * @consumer_supplies: Consumer device supply configuration.
231 *
232 * @regulator_init: Callback invoked when the regulator has been registered.
233 * @driver_data: Data passed to regulator_init.
234 */
235 struct regulator_init_data {
236 const char *supply_regulator; /* or NULL for system supply */
237
238 struct regulation_constraints constraints;
239
240 int num_consumer_supplies;
241 struct regulator_consumer_supply *consumer_supplies;
242
243 /* optional regulator machine specific init */
244 int (*regulator_init)(void *driver_data);
245 void *driver_data; /* core does not touch this */
246 };
247
248 #ifdef CONFIG_REGULATOR
249 void regulator_has_full_constraints(void);
250 #else
regulator_has_full_constraints(void)251 static inline void regulator_has_full_constraints(void)
252 {
253 }
254 #endif
255
regulator_suspend_prepare(suspend_state_t state)256 static inline int regulator_suspend_prepare(suspend_state_t state)
257 {
258 return 0;
259 }
regulator_suspend_finish(void)260 static inline int regulator_suspend_finish(void)
261 {
262 return 0;
263 }
264
265 #endif
266
