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 <[email protected]>
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 /*
53 * Default time window (in milliseconds) following a critical under-voltage
54 * event during which less critical actions can be safely carried out by the
55 * system.
56 */
57 #define REGULATOR_DEF_UV_LESS_CRITICAL_WINDOW_MS 10
58
59 /* Regulator active discharge flags */
60 enum regulator_active_discharge {
61 REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
62 REGULATOR_ACTIVE_DISCHARGE_DISABLE,
63 REGULATOR_ACTIVE_DISCHARGE_ENABLE,
64 };
65
66 /**
67 * struct regulator_state - regulator state during low power system states
68 *
69 * This describes a regulators state during a system wide low power
70 * state. One of enabled or disabled must be set for the
71 * configuration to be applied.
72 *
73 * @uV: Default operating voltage during suspend, it can be adjusted
74 * among <min_uV, max_uV>.
75 * @min_uV: Minimum suspend voltage may be set.
76 * @max_uV: Maximum suspend voltage may be set.
77 * @mode: Operating mode during suspend.
78 * @enabled: operations during suspend.
79 * - DO_NOTHING_IN_SUSPEND
80 * - DISABLE_IN_SUSPEND
81 * - ENABLE_IN_SUSPEND
82 * @changeable: Is this state can be switched between enabled/disabled,
83 */
84 struct regulator_state {
85 int uV;
86 int min_uV;
87 int max_uV;
88 unsigned int mode;
89 int enabled;
90 bool changeable;
91 };
92
93 #define REGULATOR_NOTIF_LIMIT_DISABLE -1
94 #define REGULATOR_NOTIF_LIMIT_ENABLE -2
95 struct notification_limit {
96 int prot;
97 int err;
98 int warn;
99 };
100
101 /**
102 * struct regulation_constraints - regulator operating constraints.
103 *
104 * This struct describes regulator and board/machine specific constraints.
105 *
106 * @name: Descriptive name for the constraints, used for display purposes.
107 *
108 * @min_uV: Smallest voltage consumers may set.
109 * @max_uV: Largest voltage consumers may set.
110 * @uV_offset: Offset applied to voltages from consumer to compensate for
111 * voltage drops.
112 *
113 * @min_uA: Smallest current consumers may set.
114 * @max_uA: Largest current consumers may set.
115 * @ilim_uA: Maximum input current.
116 * @pw_budget_mW: Power budget for the regulator in mW.
117 * @system_load: Load that isn't captured by any consumer requests.
118 *
119 * @over_curr_limits: Limits for acting on over current.
120 * @over_voltage_limits: Limits for acting on over voltage.
121 * @under_voltage_limits: Limits for acting on under voltage.
122 * @temp_limits: Limits for acting on over temperature.
123 *
124 * @max_spread: Max possible spread between coupled regulators
125 * @max_uV_step: Max possible step change in voltage
126 * @valid_modes_mask: Mask of modes which may be configured by consumers.
127 * @valid_ops_mask: Operations which may be performed by consumers.
128 *
129 * @always_on: Set if the regulator should never be disabled.
130 * @boot_on: Set if the regulator is enabled when the system is initially
131 * started. If the regulator is not enabled by the hardware or
132 * bootloader then it will be enabled when the constraints are
133 * applied.
134 * @apply_uV: Apply the voltage constraint when initialising.
135 * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
136 * @soft_start: Enable soft start so that voltage ramps slowly.
137 * @pull_down: Enable pull down when regulator is disabled.
138 * @system_critical: Set if the regulator is critical to system stability or
139 * functionality.
140 * @over_current_protection: Auto disable on over current event.
141 *
142 * @over_current_detection: Configure over current limits.
143 * @over_voltage_detection: Configure over voltage limits.
144 * @under_voltage_detection: Configure under voltage limits.
145 * @over_temp_detection: Configure over temperature limits.
146 *
147 * @input_uV: Input voltage for regulator when supplied by another regulator.
148 *
149 * @state_disk: State for regulator when system is suspended in disk mode.
150 * @state_mem: State for regulator when system is suspended in mem mode.
151 * @state_standby: State for regulator when system is suspended in standby
152 * mode.
153 * @initial_state: Suspend state to set by default.
154 * @initial_mode: Mode to set at startup.
155 * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
156 * @settling_time: Time to settle down after voltage change when voltage
157 * change is non-linear (unit: microseconds).
158 * @settling_time_up: Time to settle down after voltage increase when voltage
159 * change is non-linear (unit: microseconds).
160 * @settling_time_down : Time to settle down after voltage decrease when
161 * voltage change is non-linear (unit: microseconds).
162 * @active_discharge: Enable/disable active discharge. The enum
163 * regulator_active_discharge values are used for
164 * initialisation.
165 * @enable_time: Turn-on time of the rails (unit: microseconds)
166 * @uv_less_critical_window_ms: Specifies the time window (in milliseconds)
167 * following a critical under-voltage (UV) event
168 * during which less critical actions can be
169 * safely carried out by the system (for example
170 * logging). After this time window more critical
171 * actions should be done (for example prevent
172 * HW damage).
173 */
174 struct regulation_constraints {
175
176 const char *name;
177
178 /* voltage output range (inclusive) - for voltage control */
179 int min_uV;
180 int max_uV;
181
182 int uV_offset;
183
184 /* current output range (inclusive) - for current control */
185 int min_uA;
186 int max_uA;
187 int ilim_uA;
188
189 int pw_budget_mW;
190 int system_load;
191
192 /* used for coupled regulators */
193 u32 *max_spread;
194
195 /* used for changing voltage in steps */
196 int max_uV_step;
197
198 /* valid regulator operating modes for this machine */
199 unsigned int valid_modes_mask;
200
201 /* valid operations for regulator on this machine */
202 unsigned int valid_ops_mask;
203
204 /* regulator input voltage - only if supply is another regulator */
205 int input_uV;
206
207 /* regulator suspend states for global PMIC STANDBY/HIBERNATE */
208 struct regulator_state state_disk;
209 struct regulator_state state_mem;
210 struct regulator_state state_standby;
211 struct notification_limit over_curr_limits;
212 struct notification_limit over_voltage_limits;
213 struct notification_limit under_voltage_limits;
214 struct notification_limit temp_limits;
215 suspend_state_t initial_state; /* suspend state to set at init */
216
217 /* mode to set on startup */
218 unsigned int initial_mode;
219
220 unsigned int ramp_delay;
221 unsigned int settling_time;
222 unsigned int settling_time_up;
223 unsigned int settling_time_down;
224 unsigned int enable_time;
225 unsigned int uv_less_critical_window_ms;
226
227 unsigned int active_discharge;
228
229 /* constraint flags */
230 unsigned always_on:1; /* regulator never off when system is on */
231 unsigned boot_on:1; /* bootloader/firmware enabled regulator */
232 unsigned apply_uV:1; /* apply uV constraint if min == max */
233 unsigned ramp_disable:1; /* disable ramp delay */
234 unsigned soft_start:1; /* ramp voltage slowly */
235 unsigned pull_down:1; /* pull down resistor when regulator off */
236 unsigned system_critical:1; /* critical to system stability */
237 unsigned over_current_protection:1; /* auto disable on over current */
238 unsigned over_current_detection:1; /* notify on over current */
239 unsigned over_voltage_detection:1; /* notify on over voltage */
240 unsigned under_voltage_detection:1; /* notify on under voltage */
241 unsigned over_temp_detection:1; /* notify on over temperature */
242 };
243
244 /**
245 * struct regulator_consumer_supply - supply -> device mapping
246 *
247 * This maps a supply name to a device. Use of dev_name allows support for
248 * buses which make struct device available late such as I2C.
249 *
250 * @dev_name: Result of dev_name() for the consumer.
251 * @supply: Name for the supply.
252 */
253 struct regulator_consumer_supply {
254 const char *dev_name; /* dev_name() for consumer */
255 const char *supply; /* consumer supply - e.g. "vcc" */
256 };
257
258 /* Initialize struct regulator_consumer_supply */
259 #define REGULATOR_SUPPLY(_name, _dev_name) \
260 { \
261 .supply = _name, \
262 .dev_name = _dev_name, \
263 }
264
265 /**
266 * struct regulator_init_data - regulator platform initialisation data.
267 *
268 * Initialisation constraints, our supply and consumers supplies.
269 *
270 * @supply_regulator: Parent regulator. Specified using the regulator name
271 * as it appears in the name field in sysfs, which can
272 * be explicitly set using the constraints field 'name'.
273 *
274 * @constraints: Constraints. These must be specified for the regulator to
275 * be usable.
276 * @num_consumer_supplies: Number of consumer device supplies.
277 * @consumer_supplies: Consumer device supply configuration.
278 * @driver_data: Data passed to regulator_init.
279 */
280 struct regulator_init_data {
281 const char *supply_regulator; /* or NULL for system supply */
282
283 struct regulation_constraints constraints;
284
285 int num_consumer_supplies;
286 struct regulator_consumer_supply *consumer_supplies;
287
288 /* optional regulator machine specific data */
289 void *driver_data; /* core does not touch this */
290 };
291
292 #ifdef CONFIG_REGULATOR
293 void regulator_has_full_constraints(void);
294 #else
regulator_has_full_constraints(void)295 static inline void regulator_has_full_constraints(void)
296 {
297 }
298 #endif
299
regulator_suspend_prepare(suspend_state_t state)300 static inline int regulator_suspend_prepare(suspend_state_t state)
301 {
302 return 0;
303 }
regulator_suspend_finish(void)304 static inline int regulator_suspend_finish(void)
305 {
306 return 0;
307 }
308
309 #endif
310