245 lines
8.2 KiB
C
245 lines
8.2 KiB
C
/*
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* machine.h -- SoC Regulator support, machine/board driver API.
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*
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* Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
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*
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* Author: Liam Girdwood <lrg@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Regulator Machine/Board Interface.
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*/
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#ifndef __LINUX_REGULATOR_MACHINE_H_
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#define __LINUX_REGULATOR_MACHINE_H_
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#include <linux/regulator/consumer.h>
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#include <linux/suspend.h>
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struct regulator;
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/*
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* Regulator operation constraint flags. These flags are used to enable
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* certain regulator operations and can be OR'ed together.
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*
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* VOLTAGE: Regulator output voltage can be changed by software on this
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* board/machine.
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* CURRENT: Regulator output current can be changed by software on this
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* board/machine.
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* MODE: Regulator operating mode can be changed by software on this
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* board/machine.
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* STATUS: Regulator can be enabled and disabled.
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* DRMS: Dynamic Regulator Mode Switching is enabled for this regulator.
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* BYPASS: Regulator can be put into bypass mode
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*/
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#define REGULATOR_CHANGE_VOLTAGE 0x1
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#define REGULATOR_CHANGE_CURRENT 0x2
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#define REGULATOR_CHANGE_MODE 0x4
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#define REGULATOR_CHANGE_STATUS 0x8
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#define REGULATOR_CHANGE_DRMS 0x10
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#define REGULATOR_CHANGE_BYPASS 0x20
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/* Regulator active discharge flags */
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enum regulator_active_discharge {
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REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
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REGULATOR_ACTIVE_DISCHARGE_DISABLE,
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REGULATOR_ACTIVE_DISCHARGE_ENABLE,
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};
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/**
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* struct regulator_state - regulator state during low power system states
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*
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* This describes a regulators state during a system wide low power
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* state. One of enabled or disabled must be set for the
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* configuration to be applied.
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*
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* @uV: Operating voltage during suspend.
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* @mode: Operating mode during suspend.
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* @enabled: Enabled during suspend.
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* @disabled: Disabled during suspend.
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*/
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struct regulator_state {
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int uV; /* suspend voltage */
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unsigned int mode; /* suspend regulator operating mode */
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int enabled; /* is regulator enabled in this suspend state */
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int disabled; /* is the regulator disabled in this suspend state */
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};
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/**
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* struct regulation_constraints - regulator operating constraints.
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*
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* This struct describes regulator and board/machine specific constraints.
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*
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* @name: Descriptive name for the constraints, used for display purposes.
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*
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* @min_uV: Smallest voltage consumers may set.
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* @max_uV: Largest voltage consumers may set.
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* @uV_offset: Offset applied to voltages from consumer to compensate for
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* voltage drops.
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*
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* @min_uA: Smallest current consumers may set.
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* @max_uA: Largest current consumers may set.
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* @ilim_uA: Maximum input current.
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* @system_load: Load that isn't captured by any consumer requests.
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*
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* @valid_modes_mask: Mask of modes which may be configured by consumers.
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* @valid_ops_mask: Operations which may be performed by consumers.
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*
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* @always_on: Set if the regulator should never be disabled.
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* @boot_on: Set if the regulator is enabled when the system is initially
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* started. If the regulator is not enabled by the hardware or
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* bootloader then it will be enabled when the constraints are
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* applied.
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* @apply_uV: Apply the voltage constraint when initialising.
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* @ramp_disable: Disable ramp delay when initialising or when setting voltage.
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* @soft_start: Enable soft start so that voltage ramps slowly.
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* @pull_down: Enable pull down when regulator is disabled.
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* @over_current_protection: Auto disable on over current event.
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*
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* @input_uV: Input voltage for regulator when supplied by another regulator.
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*
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* @state_disk: State for regulator when system is suspended in disk mode.
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* @state_mem: State for regulator when system is suspended in mem mode.
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* @state_standby: State for regulator when system is suspended in standby
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* mode.
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* @initial_state: Suspend state to set by default.
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* @initial_mode: Mode to set at startup.
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* @ramp_delay: Time to settle down after voltage change (unit: uV/us)
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* @settling_time: Time to settle down after voltage change when voltage
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* change is non-linear (unit: microseconds).
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* @settling_time_up: Time to settle down after voltage increase when voltage
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* change is non-linear (unit: microseconds).
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* @settling_time_down : Time to settle down after voltage decrease when
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* voltage change is non-linear (unit: microseconds).
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* @active_discharge: Enable/disable active discharge. The enum
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* regulator_active_discharge values are used for
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* initialisation.
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* @enable_time: Turn-on time of the rails (unit: microseconds)
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*/
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struct regulation_constraints {
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const char *name;
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/* voltage output range (inclusive) - for voltage control */
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int min_uV;
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int max_uV;
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int uV_offset;
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/* current output range (inclusive) - for current control */
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int min_uA;
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int max_uA;
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int ilim_uA;
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int system_load;
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/* valid regulator operating modes for this machine */
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unsigned int valid_modes_mask;
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/* valid operations for regulator on this machine */
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unsigned int valid_ops_mask;
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/* regulator input voltage - only if supply is another regulator */
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int input_uV;
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/* regulator suspend states for global PMIC STANDBY/HIBERNATE */
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struct regulator_state state_disk;
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struct regulator_state state_mem;
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struct regulator_state state_standby;
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suspend_state_t initial_state; /* suspend state to set at init */
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/* mode to set on startup */
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unsigned int initial_mode;
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unsigned int ramp_delay;
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unsigned int settling_time;
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unsigned int settling_time_up;
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unsigned int settling_time_down;
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unsigned int enable_time;
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unsigned int active_discharge;
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/* constraint flags */
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unsigned always_on:1; /* regulator never off when system is on */
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unsigned boot_on:1; /* bootloader/firmware enabled regulator */
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unsigned apply_uV:1; /* apply uV constraint if min == max */
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unsigned ramp_disable:1; /* disable ramp delay */
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unsigned soft_start:1; /* ramp voltage slowly */
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unsigned pull_down:1; /* pull down resistor when regulator off */
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unsigned over_current_protection:1; /* auto disable on over current */
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};
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/**
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* struct regulator_consumer_supply - supply -> device mapping
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*
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* This maps a supply name to a device. Use of dev_name allows support for
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* buses which make struct device available late such as I2C.
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*
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* @dev_name: Result of dev_name() for the consumer.
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* @supply: Name for the supply.
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*/
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struct regulator_consumer_supply {
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const char *dev_name; /* dev_name() for consumer */
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const char *supply; /* consumer supply - e.g. "vcc" */
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};
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/* Initialize struct regulator_consumer_supply */
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#define REGULATOR_SUPPLY(_name, _dev_name) \
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{ \
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.supply = _name, \
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.dev_name = _dev_name, \
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}
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/**
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* struct regulator_init_data - regulator platform initialisation data.
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*
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* Initialisation constraints, our supply and consumers supplies.
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*
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* @supply_regulator: Parent regulator. Specified using the regulator name
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* as it appears in the name field in sysfs, which can
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* be explicitly set using the constraints field 'name'.
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*
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* @constraints: Constraints. These must be specified for the regulator to
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* be usable.
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* @num_consumer_supplies: Number of consumer device supplies.
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* @consumer_supplies: Consumer device supply configuration.
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*
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* @regulator_init: Callback invoked when the regulator has been registered.
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* @driver_data: Data passed to regulator_init.
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*/
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struct regulator_init_data {
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const char *supply_regulator; /* or NULL for system supply */
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struct regulation_constraints constraints;
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int num_consumer_supplies;
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struct regulator_consumer_supply *consumer_supplies;
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/* optional regulator machine specific init */
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int (*regulator_init)(void *driver_data);
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void *driver_data; /* core does not touch this */
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};
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#ifdef CONFIG_REGULATOR
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void regulator_has_full_constraints(void);
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int regulator_suspend_prepare(suspend_state_t state);
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int regulator_suspend_finish(void);
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#else
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static inline void regulator_has_full_constraints(void)
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{
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}
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static inline int regulator_suspend_prepare(suspend_state_t state)
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{
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return 0;
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}
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static inline int regulator_suspend_finish(void)
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{
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return 0;
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}
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#endif
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#endif
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