/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2010-2011 Jeremy Kerr <[email protected]> * Copyright (C) 2011-2012 Linaro Ltd <[email protected]> */ #ifndef __LINUX_CLK_PROVIDER_H #define __LINUX_CLK_PROVIDER_H #include <linux/of.h> #include <linux/of_clk.h> /* * flags used across common struct clk. these flags should only affect the * top-level framework. custom flags for dealing with hardware specifics * belong in struct clk_foo * * Please update clk_flags[] in drivers/clk/clk.c when making changes here! */ #define CLK_SET_RATE_GATE … #define CLK_SET_PARENT_GATE … #define CLK_SET_RATE_PARENT … #define CLK_IGNORE_UNUSED … /* unused */ /* unused */ #define CLK_GET_RATE_NOCACHE … #define CLK_SET_RATE_NO_REPARENT … #define CLK_GET_ACCURACY_NOCACHE … #define CLK_RECALC_NEW_RATES … #define CLK_SET_RATE_UNGATE … #define CLK_IS_CRITICAL … /* parents need enable during gate/ungate, set rate and re-parent */ #define CLK_OPS_PARENT_ENABLE … /* duty cycle call may be forwarded to the parent clock */ #define CLK_DUTY_CYCLE_PARENT … struct clk; struct clk_hw; struct clk_core; struct dentry; /** * struct clk_rate_request - Structure encoding the clk constraints that * a clock user might require. * * Should be initialized by calling clk_hw_init_rate_request(). * * @core: Pointer to the struct clk_core affected by this request * @rate: Requested clock rate. This field will be adjusted by * clock drivers according to hardware capabilities. * @min_rate: Minimum rate imposed by clk users. * @max_rate: Maximum rate imposed by clk users. * @best_parent_rate: The best parent rate a parent can provide to fulfill the * requested constraints. * @best_parent_hw: The most appropriate parent clock that fulfills the * requested constraints. * */ struct clk_rate_request { … }; void clk_hw_init_rate_request(const struct clk_hw *hw, struct clk_rate_request *req, unsigned long rate); void clk_hw_forward_rate_request(const struct clk_hw *core, const struct clk_rate_request *old_req, const struct clk_hw *parent, struct clk_rate_request *req, unsigned long parent_rate); /** * struct clk_duty - Structure encoding the duty cycle ratio of a clock * * @num: Numerator of the duty cycle ratio * @den: Denominator of the duty cycle ratio */ struct clk_duty { … }; /** * struct clk_ops - Callback operations for hardware clocks; these are to * be provided by the clock implementation, and will be called by drivers * through the clk_* api. * * @prepare: Prepare the clock for enabling. This must not return until * the clock is fully prepared, and it's safe to call clk_enable. * This callback is intended to allow clock implementations to * do any initialisation that may sleep. Called with * prepare_lock held. * * @unprepare: Release the clock from its prepared state. This will typically * undo any work done in the @prepare callback. Called with * prepare_lock held. * * @is_prepared: Queries the hardware to determine if the clock is prepared. * This function is allowed to sleep. Optional, if this op is not * set then the prepare count will be used. * * @unprepare_unused: Unprepare the clock atomically. Only called from * clk_disable_unused for prepare clocks with special needs. * Called with prepare mutex held. This function may sleep. * * @enable: Enable the clock atomically. This must not return until the * clock is generating a valid clock signal, usable by consumer * devices. Called with enable_lock held. This function must not * sleep. * * @disable: Disable the clock atomically. Called with enable_lock held. * This function must not sleep. * * @is_enabled: Queries the hardware to determine if the clock is enabled. * This function must not sleep. Optional, if this op is not * set then the enable count will be used. * * @disable_unused: Disable the clock atomically. Only called from * clk_disable_unused for gate clocks with special needs. * Called with enable_lock held. This function must not * sleep. * * @save_context: Save the context of the clock in prepration for poweroff. * * @restore_context: Restore the context of the clock after a restoration * of power. * * @recalc_rate: Recalculate the rate of this clock, by querying hardware. The * parent rate is an input parameter. It is up to the caller to * ensure that the prepare_mutex is held across this call. If the * driver cannot figure out a rate for this clock, it must return * 0. Returns the calculated rate. Optional, but recommended - if * this op is not set then clock rate will be initialized to 0. * * @round_rate: Given a target rate as input, returns the closest rate actually * supported by the clock. The parent rate is an input/output * parameter. * * @determine_rate: Given a target rate as input, returns the closest rate * actually supported by the clock, and optionally the parent clock * that should be used to provide the clock rate. * * @set_parent: Change the input source of this clock; for clocks with multiple * possible parents specify a new parent by passing in the index * as a u8 corresponding to the parent in either the .parent_names * or .parents arrays. This function in affect translates an * array index into the value programmed into the hardware. * Returns 0 on success, -EERROR otherwise. * * @get_parent: Queries the hardware to determine the parent of a clock. The * return value is a u8 which specifies the index corresponding to * the parent clock. This index can be applied to either the * .parent_names or .parents arrays. In short, this function * translates the parent value read from hardware into an array * index. Currently only called when the clock is initialized by * __clk_init. This callback is mandatory for clocks with * multiple parents. It is optional (and unnecessary) for clocks * with 0 or 1 parents. * * @set_rate: Change the rate of this clock. The requested rate is specified * by the second argument, which should typically be the return * of .round_rate call. The third argument gives the parent rate * which is likely helpful for most .set_rate implementation. * Returns 0 on success, -EERROR otherwise. * * @set_rate_and_parent: Change the rate and the parent of this clock. The * requested rate is specified by the second argument, which * should typically be the return of .round_rate call. The * third argument gives the parent rate which is likely helpful * for most .set_rate_and_parent implementation. The fourth * argument gives the parent index. This callback is optional (and * unnecessary) for clocks with 0 or 1 parents as well as * for clocks that can tolerate switching the rate and the parent * separately via calls to .set_parent and .set_rate. * Returns 0 on success, -EERROR otherwise. * * @recalc_accuracy: Recalculate the accuracy of this clock. The clock accuracy * is expressed in ppb (parts per billion). The parent accuracy is * an input parameter. * Returns the calculated accuracy. Optional - if this op is not * set then clock accuracy will be initialized to parent accuracy * or 0 (perfect clock) if clock has no parent. * * @get_phase: Queries the hardware to get the current phase of a clock. * Returned values are 0-359 degrees on success, negative * error codes on failure. * * @set_phase: Shift the phase this clock signal in degrees specified * by the second argument. Valid values for degrees are * 0-359. Return 0 on success, otherwise -EERROR. * * @get_duty_cycle: Queries the hardware to get the current duty cycle ratio * of a clock. Returned values denominator cannot be 0 and must be * superior or equal to the numerator. * * @set_duty_cycle: Apply the duty cycle ratio to this clock signal specified by * the numerator (2nd argurment) and denominator (3rd argument). * Argument must be a valid ratio (denominator > 0 * and >= numerator) Return 0 on success, otherwise -EERROR. * * @init: Perform platform-specific initialization magic. * This is not used by any of the basic clock types. * This callback exist for HW which needs to perform some * initialisation magic for CCF to get an accurate view of the * clock. It may also be used dynamic resource allocation is * required. It shall not used to deal with clock parameters, * such as rate or parents. * Returns 0 on success, -EERROR otherwise. * * @terminate: Free any resource allocated by init. * * @debug_init: Set up type-specific debugfs entries for this clock. This * is called once, after the debugfs directory entry for this * clock has been created. The dentry pointer representing that * directory is provided as an argument. Called with * prepare_lock held. Returns 0 on success, -EERROR otherwise. * * * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow * implementations to split any work between atomic (enable) and sleepable * (prepare) contexts. If enabling a clock requires code that might sleep, * this must be done in clk_prepare. Clock enable code that will never be * called in a sleepable context may be implemented in clk_enable. * * Typically, drivers will call clk_prepare when a clock may be needed later * (eg. when a device is opened), and clk_enable when the clock is actually * required (eg. from an interrupt). Note that clk_prepare MUST have been * called before clk_enable. */ struct clk_ops { … }; /** * struct clk_parent_data - clk parent information * @hw: parent clk_hw pointer (used for clk providers with internal clks) * @fw_name: parent name local to provider registering clk * @name: globally unique parent name (used as a fallback) * @index: parent index local to provider registering clk (if @fw_name absent) */ struct clk_parent_data { … }; /** * struct clk_init_data - holds init data that's common to all clocks and is * shared between the clock provider and the common clock framework. * * @name: clock name * @ops: operations this clock supports * @parent_names: array of string names for all possible parents * @parent_data: array of parent data for all possible parents (when some * parents are external to the clk controller) * @parent_hws: array of pointers to all possible parents (when all parents * are internal to the clk controller) * @num_parents: number of possible parents * @flags: framework-level hints and quirks */ struct clk_init_data { … }; /** * struct clk_hw - handle for traversing from a struct clk to its corresponding * hardware-specific structure. struct clk_hw should be declared within struct * clk_foo and then referenced by the struct clk instance that uses struct * clk_foo's clk_ops * * @core: pointer to the struct clk_core instance that points back to this * struct clk_hw instance * * @clk: pointer to the per-user struct clk instance that can be used to call * into the clk API * * @init: pointer to struct clk_init_data that contains the init data shared * with the common clock framework. This pointer will be set to NULL once * a clk_register() variant is called on this clk_hw pointer. */ struct clk_hw { … }; /* * DOC: Basic clock implementations common to many platforms * * Each basic clock hardware type is comprised of a structure describing the * clock hardware, implementations of the relevant callbacks in struct clk_ops, * unique flags for that hardware type, a registration function and an * alternative macro for static initialization */ /** * struct clk_fixed_rate - fixed-rate clock * @hw: handle between common and hardware-specific interfaces * @fixed_rate: constant frequency of clock * @fixed_accuracy: constant accuracy of clock in ppb (parts per billion) * @flags: hardware specific flags * * Flags: * * CLK_FIXED_RATE_PARENT_ACCURACY - Use the accuracy of the parent clk * instead of what's set in @fixed_accuracy. */ struct clk_fixed_rate { … }; #define CLK_FIXED_RATE_PARENT_ACCURACY … extern const struct clk_ops clk_fixed_rate_ops; struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev, struct device_node *np, const char *name, const char *parent_name, const struct clk_hw *parent_hw, const struct clk_parent_data *parent_data, unsigned long flags, unsigned long fixed_rate, unsigned long fixed_accuracy, unsigned long clk_fixed_flags, bool devm); struct clk *clk_register_fixed_rate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned long fixed_rate); /** * clk_hw_register_fixed_rate - register fixed-rate clock with the clock * framework * @dev: device that is registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate */ #define clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) … /** * devm_clk_hw_register_fixed_rate - register fixed-rate clock with the clock * framework * @dev: device that is registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate */ #define devm_clk_hw_register_fixed_rate(dev, name, parent_name, flags, fixed_rate) … /** * clk_hw_register_fixed_rate_parent_hw - register fixed-rate clock with * the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_hw: pointer to parent clk * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate */ #define clk_hw_register_fixed_rate_parent_hw(dev, name, parent_hw, flags, \ fixed_rate) … /** * clk_hw_register_fixed_rate_parent_data - register fixed-rate clock with * the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_data: parent clk data * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate */ #define clk_hw_register_fixed_rate_parent_data(dev, name, parent_data, flags, \ fixed_rate) … /** * clk_hw_register_fixed_rate_with_accuracy - register fixed-rate clock with * the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate * @fixed_accuracy: non-adjustable clock accuracy */ #define clk_hw_register_fixed_rate_with_accuracy(dev, name, parent_name, \ flags, fixed_rate, \ fixed_accuracy) … /** * clk_hw_register_fixed_rate_with_accuracy_parent_hw - register fixed-rate * clock with the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_hw: pointer to parent clk * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate * @fixed_accuracy: non-adjustable clock accuracy */ #define clk_hw_register_fixed_rate_with_accuracy_parent_hw(dev, name, \ parent_hw, flags, fixed_rate, fixed_accuracy) … /** * clk_hw_register_fixed_rate_with_accuracy_parent_data - register fixed-rate * clock with the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_data: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate * @fixed_accuracy: non-adjustable clock accuracy */ #define clk_hw_register_fixed_rate_with_accuracy_parent_data(dev, name, \ parent_data, flags, fixed_rate, fixed_accuracy) … /** * clk_hw_register_fixed_rate_parent_accuracy - register fixed-rate clock with * the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_data: name of clock's parent * @flags: framework-specific flags * @fixed_rate: non-adjustable clock rate */ #define clk_hw_register_fixed_rate_parent_accuracy(dev, name, parent_data, \ flags, fixed_rate) … void clk_unregister_fixed_rate(struct clk *clk); void clk_hw_unregister_fixed_rate(struct clk_hw *hw); void of_fixed_clk_setup(struct device_node *np); /** * struct clk_gate - gating clock * * @hw: handle between common and hardware-specific interfaces * @reg: register controlling gate * @bit_idx: single bit controlling gate * @flags: hardware-specific flags * @lock: register lock * * Clock which can gate its output. Implements .enable & .disable * * Flags: * CLK_GATE_SET_TO_DISABLE - by default this clock sets the bit at bit_idx to * enable the clock. Setting this flag does the opposite: setting the bit * disable the clock and clearing it enables the clock * CLK_GATE_HIWORD_MASK - The gate settings are only in lower 16-bit * of this register, and mask of gate bits are in higher 16-bit of this * register. While setting the gate bits, higher 16-bit should also be * updated to indicate changing gate bits. * CLK_GATE_BIG_ENDIAN - by default little endian register accesses are used for * the gate register. Setting this flag makes the register accesses big * endian. */ struct clk_gate { … }; #define to_clk_gate(_hw) … #define CLK_GATE_SET_TO_DISABLE … #define CLK_GATE_HIWORD_MASK … #define CLK_GATE_BIG_ENDIAN … extern const struct clk_ops clk_gate_ops; struct clk_hw *__clk_hw_register_gate(struct device *dev, struct device_node *np, const char *name, const char *parent_name, const struct clk_hw *parent_hw, const struct clk_parent_data *parent_data, unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock); struct clk_hw *__devm_clk_hw_register_gate(struct device *dev, struct device_node *np, const char *name, const char *parent_name, const struct clk_hw *parent_hw, const struct clk_parent_data *parent_data, unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock); struct clk *clk_register_gate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock); /** * clk_hw_register_gate - register a gate clock with the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_name: name of this clock's parent * @flags: framework-specific flags for this clock * @reg: register address to control gating of this clock * @bit_idx: which bit in the register controls gating of this clock * @clk_gate_flags: gate-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx, \ clk_gate_flags, lock) … /** * clk_hw_register_gate_parent_hw - register a gate clock with the clock * framework * @dev: device that is registering this clock * @name: name of this clock * @parent_hw: pointer to parent clk * @flags: framework-specific flags for this clock * @reg: register address to control gating of this clock * @bit_idx: which bit in the register controls gating of this clock * @clk_gate_flags: gate-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_hw_register_gate_parent_hw(dev, name, parent_hw, flags, reg, \ bit_idx, clk_gate_flags, lock) … /** * clk_hw_register_gate_parent_data - register a gate clock with the clock * framework * @dev: device that is registering this clock * @name: name of this clock * @parent_data: parent clk data * @flags: framework-specific flags for this clock * @reg: register address to control gating of this clock * @bit_idx: which bit in the register controls gating of this clock * @clk_gate_flags: gate-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_hw_register_gate_parent_data(dev, name, parent_data, flags, reg, \ bit_idx, clk_gate_flags, lock) … /** * devm_clk_hw_register_gate - register a gate clock with the clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_name: name of this clock's parent * @flags: framework-specific flags for this clock * @reg: register address to control gating of this clock * @bit_idx: which bit in the register controls gating of this clock * @clk_gate_flags: gate-specific flags for this clock * @lock: shared register lock for this clock */ #define devm_clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx,\ clk_gate_flags, lock) … /** * devm_clk_hw_register_gate_parent_data - register a gate clock with the * clock framework * @dev: device that is registering this clock * @name: name of this clock * @parent_data: parent clk data * @flags: framework-specific flags for this clock * @reg: register address to control gating of this clock * @bit_idx: which bit in the register controls gating of this clock * @clk_gate_flags: gate-specific flags for this clock * @lock: shared register lock for this clock */ #define devm_clk_hw_register_gate_parent_data(dev, name, parent_data, flags, \ reg, bit_idx, clk_gate_flags, \ lock) … void clk_unregister_gate(struct clk *clk); void clk_hw_unregister_gate(struct clk_hw *hw); int clk_gate_is_enabled(struct clk_hw *hw); struct clk_div_table { … }; /** * struct clk_divider - adjustable divider clock * * @hw: handle between common and hardware-specific interfaces * @reg: register containing the divider * @shift: shift to the divider bit field * @width: width of the divider bit field * @table: array of value/divider pairs, last entry should have div = 0 * @lock: register lock * * Clock with an adjustable divider affecting its output frequency. Implements * .recalc_rate, .set_rate and .round_rate * * @flags: * CLK_DIVIDER_ONE_BASED - by default the divisor is the value read from the * register plus one. If CLK_DIVIDER_ONE_BASED is set then the divider is * the raw value read from the register, with the value of zero considered * invalid, unless CLK_DIVIDER_ALLOW_ZERO is set. * CLK_DIVIDER_POWER_OF_TWO - clock divisor is 2 raised to the value read from * the hardware register * CLK_DIVIDER_ALLOW_ZERO - Allow zero divisors. For dividers which have * CLK_DIVIDER_ONE_BASED set, it is possible to end up with a zero divisor. * Some hardware implementations gracefully handle this case and allow a * zero divisor by not modifying their input clock * (divide by one / bypass). * CLK_DIVIDER_HIWORD_MASK - The divider settings are only in lower 16-bit * of this register, and mask of divider bits are in higher 16-bit of this * register. While setting the divider bits, higher 16-bit should also be * updated to indicate changing divider bits. * CLK_DIVIDER_ROUND_CLOSEST - Makes the best calculated divider to be rounded * to the closest integer instead of the up one. * CLK_DIVIDER_READ_ONLY - The divider settings are preconfigured and should * not be changed by the clock framework. * CLK_DIVIDER_MAX_AT_ZERO - For dividers which are like CLK_DIVIDER_ONE_BASED * except when the value read from the register is zero, the divisor is * 2^width of the field. * CLK_DIVIDER_BIG_ENDIAN - By default little endian register accesses are used * for the divider register. Setting this flag makes the register accesses * big endian. */ struct clk_divider { … }; #define clk_div_mask(width) … #define to_clk_divider(_hw) … #define CLK_DIVIDER_ONE_BASED … #define CLK_DIVIDER_POWER_OF_TWO … #define CLK_DIVIDER_ALLOW_ZERO … #define CLK_DIVIDER_HIWORD_MASK … #define CLK_DIVIDER_ROUND_CLOSEST … #define CLK_DIVIDER_READ_ONLY … #define CLK_DIVIDER_MAX_AT_ZERO … #define CLK_DIVIDER_BIG_ENDIAN … extern const struct clk_ops clk_divider_ops; extern const struct clk_ops clk_divider_ro_ops; unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate, unsigned int val, const struct clk_div_table *table, unsigned long flags, unsigned long width); long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent, unsigned long rate, unsigned long *prate, const struct clk_div_table *table, u8 width, unsigned long flags); long divider_ro_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent, unsigned long rate, unsigned long *prate, const struct clk_div_table *table, u8 width, unsigned long flags, unsigned int val); int divider_determine_rate(struct clk_hw *hw, struct clk_rate_request *req, const struct clk_div_table *table, u8 width, unsigned long flags); int divider_ro_determine_rate(struct clk_hw *hw, struct clk_rate_request *req, const struct clk_div_table *table, u8 width, unsigned long flags, unsigned int val); int divider_get_val(unsigned long rate, unsigned long parent_rate, const struct clk_div_table *table, u8 width, unsigned long flags); struct clk_hw *__clk_hw_register_divider(struct device *dev, struct device_node *np, const char *name, const char *parent_name, const struct clk_hw *parent_hw, const struct clk_parent_data *parent_data, unsigned long flags, void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, const struct clk_div_table *table, spinlock_t *lock); struct clk_hw *__devm_clk_hw_register_divider(struct device *dev, struct device_node *np, const char *name, const char *parent_name, const struct clk_hw *parent_hw, const struct clk_parent_data *parent_data, unsigned long flags, void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, const struct clk_div_table *table, spinlock_t *lock); struct clk *clk_register_divider_table(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, const struct clk_div_table *table, spinlock_t *lock); /** * clk_register_divider - register a divider clock with the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_register_divider(dev, name, parent_name, flags, reg, shift, width, \ clk_divider_flags, lock) … /** * clk_hw_register_divider - register a divider clock with the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_hw_register_divider(dev, name, parent_name, flags, reg, shift, \ width, clk_divider_flags, lock) … /** * clk_hw_register_divider_parent_hw - register a divider clock with the clock * framework * @dev: device registering this clock * @name: name of this clock * @parent_hw: pointer to parent clk * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_hw_register_divider_parent_hw(dev, name, parent_hw, flags, reg, \ shift, width, clk_divider_flags, \ lock) … /** * clk_hw_register_divider_parent_data - register a divider clock with the clock * framework * @dev: device registering this clock * @name: name of this clock * @parent_data: parent clk data * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @lock: shared register lock for this clock */ #define clk_hw_register_divider_parent_data(dev, name, parent_data, flags, \ reg, shift, width, \ clk_divider_flags, lock) … /** * clk_hw_register_divider_table - register a table based divider clock with * the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @table: array of divider/value pairs ending with a div set to 0 * @lock: shared register lock for this clock */ #define clk_hw_register_divider_table(dev, name, parent_name, flags, reg, \ shift, width, clk_divider_flags, table, \ lock) … /** * clk_hw_register_divider_table_parent_hw - register a table based divider * clock with the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_hw: pointer to parent clk * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @table: array of divider/value pairs ending with a div set to 0 * @lock: shared register lock for this clock */ #define clk_hw_register_divider_table_parent_hw(dev, name, parent_hw, flags, \ reg, shift, width, \ clk_divider_flags, table, \ lock) … /** * clk_hw_register_divider_table_parent_data - register a table based divider * clock with the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_data: parent clk data * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @table: array of divider/value pairs ending with a div set to 0 * @lock: shared register lock for this clock */ #define clk_hw_register_divider_table_parent_data(dev, name, parent_data, \ flags, reg, shift, width, \ clk_divider_flags, table, \ lock) … /** * devm_clk_hw_register_divider - register a divider clock with the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @lock: shared register lock for this clock */ #define devm_clk_hw_register_divider(dev, name, parent_name, flags, reg, shift, \ width, clk_divider_flags, lock) … /** * devm_clk_hw_register_divider_parent_hw - register a divider clock with the clock framework * @dev: device registering this clock * @name: name of this clock * @parent_hw: pointer to parent clk * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @lock: shared register lock for this clock */ #define devm_clk_hw_register_divider_parent_hw(dev, name, parent_hw, flags, \ reg, shift, width, \ clk_divider_flags, lock) … /** * devm_clk_hw_register_divider_table - register a table based divider clock * with the clock framework (devres variant) * @dev: device registering this clock * @name: name of this clock * @parent_name: name of clock's parent * @flags: framework-specific flags * @reg: register address to adjust divider * @shift: number of bits to shift the bitfield * @width: width of the bitfield * @clk_divider_flags: divider-specific flags for this clock * @table: array of divider/value pairs ending with a div set to 0 * @lock: shared register lock for this clock */ #define devm_clk_hw_register_divider_table(dev, name, parent_name, flags, \ reg, shift, width, \ clk_divider_flags, table, lock) … void clk_unregister_divider(struct clk *clk); void clk_hw_unregister_divider(struct clk_hw *hw); /** * struct clk_mux - multiplexer clock * * @hw: handle between common and hardware-specific interfaces * @reg: register controlling multiplexer * @table: array of register values corresponding to the parent index * @shift: shift to multiplexer bit field * @mask: mask of mutliplexer bit field * @flags: hardware-specific flags * @lock: register lock * * Clock with multiple selectable parents. Implements .get_parent, .set_parent * and .recalc_rate * * Flags: * CLK_MUX_INDEX_ONE - register index starts at 1, not 0 * CLK_MUX_INDEX_BIT - register index is a single bit (power of two) * CLK_MUX_HIWORD_MASK - The mux settings are only in lower 16-bit of this * register, and mask of mux bits are in higher 16-bit of this register. * While setting the mux bits, higher 16-bit should also be updated to * indicate changing mux bits. * CLK_MUX_READ_ONLY - The mux registers can't be written, only read in the * .get_parent clk_op. * CLK_MUX_ROUND_CLOSEST - Use the parent rate that is closest to the desired * frequency. * CLK_MUX_BIG_ENDIAN - By default little endian register accesses are used for * the mux register. Setting this flag makes the register accesses big * endian. */ struct clk_mux { … }; #define to_clk_mux(_hw) … #define CLK_MUX_INDEX_ONE … #define CLK_MUX_INDEX_BIT … #define CLK_MUX_HIWORD_MASK … #define CLK_MUX_READ_ONLY … #define CLK_MUX_ROUND_CLOSEST … #define CLK_MUX_BIG_ENDIAN … extern const struct clk_ops clk_mux_ops; extern const struct clk_ops clk_mux_ro_ops; struct clk_hw *__clk_hw_register_mux(struct device *dev, struct device_node *np, const char *name, u8 num_parents, const char * const *parent_names, const struct clk_hw **parent_hws, const struct clk_parent_data *parent_data, unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, const u32 *table, spinlock_t *lock); struct clk_hw *__devm_clk_hw_register_mux(struct device *dev, struct device_node *np, const char *name, u8 num_parents, const char * const *parent_names, const struct clk_hw **parent_hws, const struct clk_parent_data *parent_data, unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, const u32 *table, spinlock_t *lock); struct clk *clk_register_mux_table(struct device *dev, const char *name, const char * const *parent_names, u8 num_parents, unsigned long flags, void __iomem *reg, u8 shift, u32 mask, u8 clk_mux_flags, const u32 *table, spinlock_t *lock); #define clk_register_mux(dev, name, parent_names, num_parents, flags, reg, \ shift, width, clk_mux_flags, lock) … #define clk_hw_register_mux_table(dev, name, parent_names, num_parents, \ flags, reg, shift, mask, clk_mux_flags, \ table, lock) … #define clk_hw_register_mux_table_parent_data(dev, name, parent_data, \ num_parents, flags, reg, shift, mask, \ clk_mux_flags, table, lock) … #define clk_hw_register_mux(dev, name, parent_names, num_parents, flags, reg, \ shift, width, clk_mux_flags, lock) … #define clk_hw_register_mux_hws(dev, name, parent_hws, num_parents, flags, \ reg, shift, width, clk_mux_flags, lock) … #define clk_hw_register_mux_parent_data(dev, name, parent_data, num_parents, \ flags, reg, shift, width, \ clk_mux_flags, lock) … #define clk_hw_register_mux_parent_data_table(dev, name, parent_data, \ num_parents, flags, reg, shift, \ width, clk_mux_flags, table, \ lock) … #define devm_clk_hw_register_mux(dev, name, parent_names, num_parents, flags, reg, \ shift, width, clk_mux_flags, lock) … #define devm_clk_hw_register_mux_parent_hws(dev, name, parent_hws, \ num_parents, flags, reg, shift, \ width, clk_mux_flags, lock) … #define devm_clk_hw_register_mux_parent_data_table(dev, name, parent_data, \ num_parents, flags, reg, shift, \ width, clk_mux_flags, table, \ lock) … int clk_mux_val_to_index(struct clk_hw *hw, const u32 *table, unsigned int flags, unsigned int val); unsigned int clk_mux_index_to_val(const u32 *table, unsigned int flags, u8 index); void clk_unregister_mux(struct clk *clk); void clk_hw_unregister_mux(struct clk_hw *hw); void of_fixed_factor_clk_setup(struct device_node *node); /** * struct clk_fixed_factor - fixed multiplier and divider clock * * @hw: handle between common and hardware-specific interfaces * @mult: multiplier * @div: divider * @acc: fixed accuracy in ppb * @flags: behavior modifying flags * * Clock with a fixed multiplier and divider. The output frequency is the * parent clock rate divided by div and multiplied by mult. * Implements .recalc_rate, .set_rate, .round_rate and .recalc_accuracy * * Flags: * * CLK_FIXED_FACTOR_FIXED_ACCURACY - Use the value in @acc instead of the * parent clk accuracy. */ struct clk_fixed_factor { … }; #define CLK_FIXED_FACTOR_FIXED_ACCURACY … #define to_clk_fixed_factor(_hw) … extern const struct clk_ops clk_fixed_factor_ops; struct clk *clk_register_fixed_factor(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned int mult, unsigned int div); void clk_unregister_fixed_factor(struct clk *clk); struct clk_hw *clk_hw_register_fixed_factor(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned int mult, unsigned int div); struct clk_hw *clk_hw_register_fixed_factor_fwname(struct device *dev, struct device_node *np, const char *name, const char *fw_name, unsigned long flags, unsigned int mult, unsigned int div); struct clk_hw *clk_hw_register_fixed_factor_with_accuracy_fwname(struct device *dev, struct device_node *np, const char *name, const char *fw_name, unsigned long flags, unsigned int mult, unsigned int div, unsigned long acc); void clk_hw_unregister_fixed_factor(struct clk_hw *hw); struct clk_hw *devm_clk_hw_register_fixed_factor(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned int mult, unsigned int div); struct clk_hw *devm_clk_hw_register_fixed_factor_fwname(struct device *dev, struct device_node *np, const char *name, const char *fw_name, unsigned long flags, unsigned int mult, unsigned int div); struct clk_hw *devm_clk_hw_register_fixed_factor_with_accuracy_fwname(struct device *dev, struct device_node *np, const char *name, const char *fw_name, unsigned long flags, unsigned int mult, unsigned int div, unsigned long acc); struct clk_hw *devm_clk_hw_register_fixed_factor_index(struct device *dev, const char *name, unsigned int index, unsigned long flags, unsigned int mult, unsigned int div); struct clk_hw *devm_clk_hw_register_fixed_factor_parent_hw(struct device *dev, const char *name, const struct clk_hw *parent_hw, unsigned long flags, unsigned int mult, unsigned int div); struct clk_hw *clk_hw_register_fixed_factor_parent_hw(struct device *dev, const char *name, const struct clk_hw *parent_hw, unsigned long flags, unsigned int mult, unsigned int div); /** * struct clk_fractional_divider - adjustable fractional divider clock * * @hw: handle between common and hardware-specific interfaces * @reg: register containing the divider * @mshift: shift to the numerator bit field * @mwidth: width of the numerator bit field * @nshift: shift to the denominator bit field * @nwidth: width of the denominator bit field * @approximation: clk driver's callback for calculating the divider clock * @lock: register lock * * Clock with adjustable fractional divider affecting its output frequency. * * @flags: * CLK_FRAC_DIVIDER_ZERO_BASED - by default the numerator and denominator * is the value read from the register. If CLK_FRAC_DIVIDER_ZERO_BASED * is set then the numerator and denominator are both the value read * plus one. * CLK_FRAC_DIVIDER_BIG_ENDIAN - By default little endian register accesses are * used for the divider register. Setting this flag makes the register * accesses big endian. * CLK_FRAC_DIVIDER_POWER_OF_TWO_PS - By default the resulting fraction might * be saturated and the caller will get quite far from the good enough * approximation. Instead the caller may require, by setting this flag, * to shift left by a few bits in case, when the asked one is quite small * to satisfy the desired range of denominator. It assumes that on the * caller's side the power-of-two capable prescaler exists. */ struct clk_fractional_divider { … }; #define to_clk_fd(_hw) … #define CLK_FRAC_DIVIDER_ZERO_BASED … #define CLK_FRAC_DIVIDER_BIG_ENDIAN … #define CLK_FRAC_DIVIDER_POWER_OF_TWO_PS … struct clk *clk_register_fractional_divider(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth, u8 clk_divider_flags, spinlock_t *lock); struct clk_hw *clk_hw_register_fractional_divider(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth, u8 clk_divider_flags, spinlock_t *lock); void clk_hw_unregister_fractional_divider(struct clk_hw *hw); /** * struct clk_multiplier - adjustable multiplier clock * * @hw: handle between common and hardware-specific interfaces * @reg: register containing the multiplier * @shift: shift to the multiplier bit field * @width: width of the multiplier bit field * @lock: register lock * * Clock with an adjustable multiplier affecting its output frequency. * Implements .recalc_rate, .set_rate and .round_rate * * @flags: * CLK_MULTIPLIER_ZERO_BYPASS - By default, the multiplier is the value read * from the register, with 0 being a valid value effectively * zeroing the output clock rate. If CLK_MULTIPLIER_ZERO_BYPASS is * set, then a null multiplier will be considered as a bypass, * leaving the parent rate unmodified. * CLK_MULTIPLIER_ROUND_CLOSEST - Makes the best calculated divider to be * rounded to the closest integer instead of the down one. * CLK_MULTIPLIER_BIG_ENDIAN - By default little endian register accesses are * used for the multiplier register. Setting this flag makes the register * accesses big endian. */ struct clk_multiplier { … }; #define to_clk_multiplier(_hw) … #define CLK_MULTIPLIER_ZERO_BYPASS … #define CLK_MULTIPLIER_ROUND_CLOSEST … #define CLK_MULTIPLIER_BIG_ENDIAN … extern const struct clk_ops clk_multiplier_ops; /*** * struct clk_composite - aggregate clock of mux, divider and gate clocks * * @hw: handle between common and hardware-specific interfaces * @mux_hw: handle between composite and hardware-specific mux clock * @rate_hw: handle between composite and hardware-specific rate clock * @gate_hw: handle between composite and hardware-specific gate clock * @mux_ops: clock ops for mux * @rate_ops: clock ops for rate * @gate_ops: clock ops for gate */ struct clk_composite { … }; #define to_clk_composite(_hw) … struct clk *clk_register_composite(struct device *dev, const char *name, const char * const *parent_names, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); struct clk *clk_register_composite_pdata(struct device *dev, const char *name, const struct clk_parent_data *parent_data, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); void clk_unregister_composite(struct clk *clk); struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name, const char * const *parent_names, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); struct clk_hw *clk_hw_register_composite_pdata(struct device *dev, const char *name, const struct clk_parent_data *parent_data, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); struct clk_hw *devm_clk_hw_register_composite_pdata(struct device *dev, const char *name, const struct clk_parent_data *parent_data, int num_parents, struct clk_hw *mux_hw, const struct clk_ops *mux_ops, struct clk_hw *rate_hw, const struct clk_ops *rate_ops, struct clk_hw *gate_hw, const struct clk_ops *gate_ops, unsigned long flags); void clk_hw_unregister_composite(struct clk_hw *hw); struct clk *clk_register(struct device *dev, struct clk_hw *hw); struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw); int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw); int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw); int __must_check of_clk_hw_register(struct device_node *node, struct clk_hw *hw); void clk_unregister(struct clk *clk); void clk_hw_unregister(struct clk_hw *hw); /* helper functions */ const char *__clk_get_name(const struct clk *clk); const char *clk_hw_get_name(const struct clk_hw *hw); #ifdef CONFIG_COMMON_CLK struct clk_hw *__clk_get_hw(struct clk *clk); #else static inline struct clk_hw *__clk_get_hw(struct clk *clk) { return (struct clk_hw *)clk; } #endif struct clk *clk_hw_get_clk(struct clk_hw *hw, const char *con_id); struct clk *devm_clk_hw_get_clk(struct device *dev, struct clk_hw *hw, const char *con_id); unsigned int clk_hw_get_num_parents(const struct clk_hw *hw); struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw); struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw, unsigned int index); int clk_hw_get_parent_index(struct clk_hw *hw); int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent); unsigned int __clk_get_enable_count(struct clk *clk); unsigned long clk_hw_get_rate(const struct clk_hw *hw); unsigned long clk_hw_get_flags(const struct clk_hw *hw); #define clk_hw_can_set_rate_parent(hw) … bool clk_hw_is_prepared(const struct clk_hw *hw); bool clk_hw_rate_is_protected(const struct clk_hw *hw); bool clk_hw_is_enabled(const struct clk_hw *hw); bool __clk_is_enabled(struct clk *clk); struct clk *__clk_lookup(const char *name); int __clk_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req); int __clk_determine_rate(struct clk_hw *core, struct clk_rate_request *req); int __clk_mux_determine_rate_closest(struct clk_hw *hw, struct clk_rate_request *req); int clk_mux_determine_rate_flags(struct clk_hw *hw, struct clk_rate_request *req, unsigned long flags); int clk_hw_determine_rate_no_reparent(struct clk_hw *hw, struct clk_rate_request *req); void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent); void clk_hw_get_rate_range(struct clk_hw *hw, unsigned long *min_rate, unsigned long *max_rate); void clk_hw_set_rate_range(struct clk_hw *hw, unsigned long min_rate, unsigned long max_rate); static inline void __clk_hw_set_clk(struct clk_hw *dst, struct clk_hw *src) { … } static inline long divider_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate, const struct clk_div_table *table, u8 width, unsigned long flags) { … } static inline long divider_ro_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate, const struct clk_div_table *table, u8 width, unsigned long flags, unsigned int val) { … } /* * FIXME clock api without lock protection */ unsigned long clk_hw_round_rate(struct clk_hw *hw, unsigned long rate); struct clk_onecell_data { … }; struct clk_hw_onecell_data { … }; #define CLK_OF_DECLARE(name, compat, fn) … /* * Use this macro when you have a driver that requires two initialization * routines, one at of_clk_init(), and one at platform device probe */ #define CLK_OF_DECLARE_DRIVER(name, compat, fn) … #define CLK_HW_INIT(_name, _parent, _ops, _flags) … #define CLK_HW_INIT_HW(_name, _parent, _ops, _flags) … /* * This macro is intended for drivers to be able to share the otherwise * individual struct clk_hw[] compound literals created by the compiler * when using CLK_HW_INIT_HW. It does NOT support multiple parents. */ #define CLK_HW_INIT_HWS(_name, _parent, _ops, _flags) … #define CLK_HW_INIT_FW_NAME(_name, _parent, _ops, _flags) … #define CLK_HW_INIT_PARENTS(_name, _parents, _ops, _flags) … #define CLK_HW_INIT_PARENTS_HW(_name, _parents, _ops, _flags) … #define CLK_HW_INIT_PARENTS_DATA(_name, _parents, _ops, _flags) … #define CLK_HW_INIT_NO_PARENT(_name, _ops, _flags) … #define CLK_FIXED_FACTOR(_struct, _name, _parent, \ _div, _mult, _flags) … #define CLK_FIXED_FACTOR_HW(_struct, _name, _parent, \ _div, _mult, _flags) … /* * This macro allows the driver to reuse the _parent array for multiple * fixed factor clk declarations. */ #define CLK_FIXED_FACTOR_HWS(_struct, _name, _parent, \ _div, _mult, _flags) … #define CLK_FIXED_FACTOR_FW_NAME(_struct, _name, _parent, \ _div, _mult, _flags) … #ifdef CONFIG_OF int of_clk_add_provider(struct device_node *np, struct clk *(*clk_src_get)(struct of_phandle_args *args, void *data), void *data); int of_clk_add_hw_provider(struct device_node *np, struct clk_hw *(*get)(struct of_phandle_args *clkspec, void *data), void *data); int devm_of_clk_add_hw_provider(struct device *dev, struct clk_hw *(*get)(struct of_phandle_args *clkspec, void *data), void *data); void of_clk_del_provider(struct device_node *np); struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec, void *data); struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec, void *data); struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data); struct clk_hw *of_clk_hw_onecell_get(struct of_phandle_args *clkspec, void *data); int of_clk_parent_fill(struct device_node *np, const char **parents, unsigned int size); int of_clk_detect_critical(struct device_node *np, int index, unsigned long *flags); #else /* !CONFIG_OF */ static inline int of_clk_add_provider(struct device_node *np, struct clk *(*clk_src_get)(struct of_phandle_args *args, void *data), void *data) { return 0; } static inline int of_clk_add_hw_provider(struct device_node *np, struct clk_hw *(*get)(struct of_phandle_args *clkspec, void *data), void *data) { return 0; } static inline int devm_of_clk_add_hw_provider(struct device *dev, struct clk_hw *(*get)(struct of_phandle_args *clkspec, void *data), void *data) { return 0; } static inline void of_clk_del_provider(struct device_node *np) {} static inline struct clk *of_clk_src_simple_get( struct of_phandle_args *clkspec, void *data) { return ERR_PTR(-ENOENT); } static inline struct clk_hw * of_clk_hw_simple_get(struct of_phandle_args *clkspec, void *data) { return ERR_PTR(-ENOENT); } static inline struct clk *of_clk_src_onecell_get( struct of_phandle_args *clkspec, void *data) { return ERR_PTR(-ENOENT); } static inline struct clk_hw * of_clk_hw_onecell_get(struct of_phandle_args *clkspec, void *data) { return ERR_PTR(-ENOENT); } static inline int of_clk_parent_fill(struct device_node *np, const char **parents, unsigned int size) { return 0; } static inline int of_clk_detect_critical(struct device_node *np, int index, unsigned long *flags) { return 0; } #endif /* CONFIG_OF */ void clk_gate_restore_context(struct clk_hw *hw); #endif /* CLK_PROVIDER_H */
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