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 /*
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 * @system_load: Load that isn't captured by any consumer requests.
117 *
118 * @over_curr_limits: Limits for acting on over current.
119 * @over_voltage_limits: Limits for acting on over voltage.
120 * @under_voltage_limits: Limits for acting on under voltage.
121 * @temp_limits: Limits for acting on over temperature.
122 *
123 * @max_spread: Max possible spread between coupled regulators
124 * @max_uV_step: Max possible step change in voltage
125 * @valid_modes_mask: Mask of modes which may be configured by consumers.
126 * @valid_ops_mask: Operations which may be performed by consumers.
127 *
128 * @always_on: Set if the regulator should never be disabled.
129 * @boot_on: Set if the regulator is enabled when the system is initially
130 * started. If the regulator is not enabled by the hardware or
131 * bootloader then it will be enabled when the constraints are
132 * applied.
133 * @apply_uV: Apply the voltage constraint when initialising.
134 * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
135 * @soft_start: Enable soft start so that voltage ramps slowly.
136 * @pull_down: Enable pull down when regulator is disabled.
137 * @system_critical: Set if the regulator is critical to system stability or
138 * functionality.
139 * @over_current_protection: Auto disable on over current event.
140 *
141 * @over_current_detection: Configure over current limits.
142 * @over_voltage_detection: Configure over voltage limits.
143 * @under_voltage_detection: Configure under voltage limits.
144 * @over_temp_detection: Configure over temperature limits.
145 *
146 * @input_uV: Input voltage for regulator when supplied by another regulator.
147 *
148 * @state_disk: State for regulator when system is suspended in disk mode.
149 * @state_mem: State for regulator when system is suspended in mem mode.
150 * @state_standby: State for regulator when system is suspended in standby
151 * mode.
152 * @initial_state: Suspend state to set by default.
153 * @initial_mode: Mode to set at startup.
154 * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
155 * @settling_time: Time to settle down after voltage change when voltage
156 * change is non-linear (unit: microseconds).
157 * @settling_time_up: Time to settle down after voltage increase when voltage
158 * change is non-linear (unit: microseconds).
159 * @settling_time_down : Time to settle down after voltage decrease when
160 * voltage change is non-linear (unit: microseconds).
161 * @active_discharge: Enable/disable active discharge. The enum
162 * regulator_active_discharge values are used for
163 * initialisation.
164 * @enable_time: Turn-on time of the rails (unit: microseconds)
165 * @uv_less_critical_window_ms: Specifies the time window (in milliseconds)
166 * following a critical under-voltage (UV) event
167 * during which less critical actions can be
168 * safely carried out by the system (for example
169 * logging). After this time window more critical
170 * actions should be done (for example prevent
171 * HW damage).
172 */
173 struct regulation_constraints {
174
175 const char *name;
176
177 /* voltage output range (inclusive) - for voltage control */
178 int min_uV;
179 int max_uV;
180
181 int uV_offset;
182
183 /* current output range (inclusive) - for current control */
184 int min_uA;
185 int max_uA;
186 int ilim_uA;
187
188 int system_load;
189
190 /* used for coupled regulators */
191 u32 *max_spread;
192
193 /* used for changing voltage in steps */
194 int max_uV_step;
195
196 /* valid regulator operating modes for this machine */
197 unsigned int valid_modes_mask;
198
199 /* valid operations for regulator on this machine */
200 unsigned int valid_ops_mask;
201
202 /* regulator input voltage - only if supply is another regulator */
203 int input_uV;
204
205 /* regulator suspend states for global PMIC STANDBY/HIBERNATE */
206 struct regulator_state state_disk;
207 struct regulator_state state_mem;
208 struct regulator_state state_standby;
209 struct notification_limit over_curr_limits;
210 struct notification_limit over_voltage_limits;
211 struct notification_limit under_voltage_limits;
212 struct notification_limit temp_limits;
213 suspend_state_t initial_state; /* suspend state to set at init */
214
215 /* mode to set on startup */
216 unsigned int initial_mode;
217
218 unsigned int ramp_delay;
219 unsigned int settling_time;
220 unsigned int settling_time_up;
221 unsigned int settling_time_down;
222 unsigned int enable_time;
223 unsigned int uv_less_critical_window_ms;
224
225 unsigned int active_discharge;
226
227 /* constraint flags */
228 unsigned always_on:1; /* regulator never off when system is on */
229 unsigned boot_on:1; /* bootloader/firmware enabled regulator */
230 unsigned apply_uV:1; /* apply uV constraint if min == max */
231 unsigned ramp_disable:1; /* disable ramp delay */
232 unsigned soft_start:1; /* ramp voltage slowly */
233 unsigned pull_down:1; /* pull down resistor when regulator off */
234 unsigned system_critical:1; /* critical to system stability */
235 unsigned over_current_protection:1; /* auto disable on over current */
236 unsigned over_current_detection:1; /* notify on over current */
237 unsigned over_voltage_detection:1; /* notify on over voltage */
238 unsigned under_voltage_detection:1; /* notify on under voltage */
239 unsigned over_temp_detection:1; /* notify on over temperature */
240 };
241
242 /**
243 * struct regulator_consumer_supply - supply -> device mapping
244 *
245 * This maps a supply name to a device. Use of dev_name allows support for
246 * buses which make struct device available late such as I2C.
247 *
248 * @dev_name: Result of dev_name() for the consumer.
249 * @supply: Name for the supply.
250 */
251 struct regulator_consumer_supply {
252 const char *dev_name; /* dev_name() for consumer */
253 const char *supply; /* consumer supply - e.g. "vcc" */
254 };
255
256 /* Initialize struct regulator_consumer_supply */
257 #define REGULATOR_SUPPLY(_name, _dev_name) \
258 { \
259 .supply = _name, \
260 .dev_name = _dev_name, \
261 }
262
263 /**
264 * struct regulator_init_data - regulator platform initialisation data.
265 *
266 * Initialisation constraints, our supply and consumers supplies.
267 *
268 * @supply_regulator: Parent regulator. Specified using the regulator name
269 * as it appears in the name field in sysfs, which can
270 * be explicitly set using the constraints field 'name'.
271 *
272 * @constraints: Constraints. These must be specified for the regulator to
273 * be usable.
274 * @num_consumer_supplies: Number of consumer device supplies.
275 * @consumer_supplies: Consumer device supply configuration.
276 *
277 * @regulator_init: Callback invoked when the regulator has been registered.
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 init */
289 int (*regulator_init)(void *driver_data);
290 void *driver_data; /* core does not touch this */
291 };
292
293 #ifdef CONFIG_REGULATOR
294 void regulator_has_full_constraints(void);
295 #else
regulator_has_full_constraints(void)296 static inline void regulator_has_full_constraints(void)
297 {
298 }
299 #endif
300
regulator_suspend_prepare(suspend_state_t state)301 static inline int regulator_suspend_prepare(suspend_state_t state)
302 {
303 return 0;
304 }
regulator_suspend_finish(void)305 static inline int regulator_suspend_finish(void)
306 {
307 return 0;
308 }
309
310 #endif
311