include/linux/regulator/machine.h

   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  * @driver_data: Data passed to regulator_init.
 277  */
 278 struct regulator_init_data {
 279         const char *supply_regulator;        /* or NULL for system supply */
 280
 281         struct regulation_constraints constraints;
 282
 283         int num_consumer_supplies;
 284         struct regulator_consumer_supply *consumer_supplies;
 285
 286         /* optional regulator machine specific data */
 287         void *driver_data;      /* core does not touch this */
 288 };
 289
 290 #ifdef CONFIG_REGULATOR
 291 void regulator_has_full_constraints(void);
 292 #else
 293 static inline void regulator_has_full_constraints(void)
 294 {
 295 }
 296 #endif
 297
 298 static inline int regulator_suspend_prepare(suspend_state_t state)
 299 {
 300         return 0;
 301 }
 302 static inline int regulator_suspend_finish(void)
 303 {
 304         return 0;
 305 }
 306
 307 #endif