288 lines
12 KiB
C
288 lines
12 KiB
C
/*
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* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __PINCTRL_H
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#define __PINCTRL_H
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/**
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* struct pinconf_param - pin config parameters
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*
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* @property: property name in DT nodes
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* @param: ID for this config parameter
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* @default_value: default value for this config parameter used in case
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* no value is specified in DT nodes
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*/
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struct pinconf_param {
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const char * const property;
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unsigned int param;
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u32 default_value;
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};
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/**
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* struct pinctrl_ops - pin control operations, to be implemented by
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* pin controller drivers.
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*
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* The @set_state is the only mandatory operation. You can implement your
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* pinctrl driver with its own @set_state. In this case, the other callbacks
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* are not required. Otherwise, generic pinctrl framework is also available;
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* use pinctrl_generic_set_state for @set_state, and implement other operations
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* depending on your necessity.
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*
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* @get_pins_count: return number of selectable named pins available
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* in this driver. (necessary to parse "pins" property in DTS)
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* @get_pin_name: return the pin name of the pin selector,
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* called by the core to figure out which pin it shall do
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* operations to. (necessary to parse "pins" property in DTS)
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* @get_groups_count: return number of selectable named groups available
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* in this driver. (necessary to parse "groups" property in DTS)
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* @get_group_name: return the group name of the group selector,
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* called by the core to figure out which pin group it shall do
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* operations to. (necessary to parse "groups" property in DTS)
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* @get_functions_count: return number of selectable named functions available
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* in this driver. (necessary for pin-muxing)
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* @get_function_name: return the function name of the muxing selector,
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* called by the core to figure out which mux setting it shall map a
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* certain device to. (necessary for pin-muxing)
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* @pinmux_set: enable a certain muxing function with a certain pin.
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* The @func_selector selects a certain function whereas @pin_selector
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* selects a certain pin to be used. On simple controllers one of them
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* may be ignored. (necessary for pin-muxing against a single pin)
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* @pinmux_group_set: enable a certain muxing function with a certain pin
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* group. The @func_selector selects a certain function whereas
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* @group_selector selects a certain set of pins to be used. On simple
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* controllers one of them may be ignored.
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* (necessary for pin-muxing against a pin group)
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* @pinconf_num_params: number of driver-specific parameters to be parsed
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* from device trees (necessary for pin-configuration)
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* @pinconf_params: list of driver_specific parameters to be parsed from
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* device trees (necessary for pin-configuration)
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* @pinconf_set: configure an individual pin with a given parameter.
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* (necessary for pin-configuration against a single pin)
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* @pinconf_group_set: configure all pins in a group with a given parameter.
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* (necessary for pin-configuration against a pin group)
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* @set_state: do pinctrl operations specified by @config, a pseudo device
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* pointing a config node. (necessary for pinctrl_full)
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* @set_state_simple: do needed pinctrl operations for a peripherl @periph.
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* (necessary for pinctrl_simple)
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*/
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struct pinctrl_ops {
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int (*get_pins_count)(struct udevice *dev);
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const char *(*get_pin_name)(struct udevice *dev, unsigned selector);
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int (*get_groups_count)(struct udevice *dev);
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const char *(*get_group_name)(struct udevice *dev, unsigned selector);
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int (*get_functions_count)(struct udevice *dev);
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const char *(*get_function_name)(struct udevice *dev,
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unsigned selector);
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int (*pinmux_set)(struct udevice *dev, unsigned pin_selector,
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unsigned func_selector);
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int (*pinmux_group_set)(struct udevice *dev, unsigned group_selector,
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unsigned func_selector);
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unsigned int pinconf_num_params;
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const struct pinconf_param *pinconf_params;
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int (*pinconf_set)(struct udevice *dev, unsigned pin_selector,
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unsigned param, unsigned argument);
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int (*pinconf_group_set)(struct udevice *dev, unsigned group_selector,
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unsigned param, unsigned argument);
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int (*set_state)(struct udevice *dev, struct udevice *config);
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/* for pinctrl-simple */
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int (*set_state_simple)(struct udevice *dev, struct udevice *periph);
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/**
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* request() - Request a particular pinctrl function
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*
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* This activates the selected function.
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*
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* @dev: Device to adjust (UCLASS_PINCTRL)
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* @func: Function number (driver-specific)
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* @return 0 if OK, -ve on error
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*/
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int (*request)(struct udevice *dev, int func, int flags);
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/**
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* get_periph_id() - get the peripheral ID for a device
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*
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* This generally looks at the peripheral's device tree node to work
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* out the peripheral ID. The return value is normally interpreted as
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* enum periph_id. so long as this is defined by the platform (which it
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* should be).
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*
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* @dev: Pinctrl device to use for decoding
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* @periph: Device to check
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* @return peripheral ID of @periph, or -ENOENT on error
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*/
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int (*get_periph_id)(struct udevice *dev, struct udevice *periph);
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};
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#define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops)
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/**
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* Generic pin configuration paramters
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*
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* @PIN_CONFIG_BIAS_DISABLE: disable any pin bias on the pin, a
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* transition from say pull-up to pull-down implies that you disable
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* pull-up in the process, this setting disables all biasing.
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* @PIN_CONFIG_BIAS_HIGH_IMPEDANCE: the pin will be set to a high impedance
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* mode, also know as "third-state" (tristate) or "high-Z" or "floating".
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* On output pins this effectively disconnects the pin, which is useful
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* if for example some other pin is going to drive the signal connected
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* to it for a while. Pins used for input are usually always high
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* impedance.
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* @PIN_CONFIG_BIAS_BUS_HOLD: the pin will be set to weakly latch so that it
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* weakly drives the last value on a tristate bus, also known as a "bus
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* holder", "bus keeper" or "repeater". This allows another device on the
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* bus to change the value by driving the bus high or low and switching to
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* tristate. The argument is ignored.
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* @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
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* impedance to VDD). If the argument is != 0 pull-up is enabled,
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* if it is 0, pull-up is total, i.e. the pin is connected to VDD.
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* @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
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* impedance to GROUND). If the argument is != 0 pull-down is enabled,
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* if it is 0, pull-down is total, i.e. the pin is connected to GROUND.
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* @PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: the pin will be pulled up or down based
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* on embedded knowledge of the controller hardware, like current mux
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* function. The pull direction and possibly strength too will normally
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* be decided completely inside the hardware block and not be readable
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* from the kernel side.
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* If the argument is != 0 pull up/down is enabled, if it is 0, the
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* configuration is ignored. The proper way to disable it is to use
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* @PIN_CONFIG_BIAS_DISABLE.
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* @PIN_CONFIG_DRIVE_PUSH_PULL: the pin will be driven actively high and
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* low, this is the most typical case and is typically achieved with two
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* active transistors on the output. Setting this config will enable
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* push-pull mode, the argument is ignored.
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* @PIN_CONFIG_DRIVE_OPEN_DRAIN: the pin will be driven with open drain (open
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* collector) which means it is usually wired with other output ports
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* which are then pulled up with an external resistor. Setting this
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* config will enable open drain mode, the argument is ignored.
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* @PIN_CONFIG_DRIVE_OPEN_SOURCE: the pin will be driven with open source
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* (open emitter). Setting this config will enable open source mode, the
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* argument is ignored.
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* @PIN_CONFIG_DRIVE_STRENGTH: the pin will sink or source at most the current
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* passed as argument. The argument is in mA.
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* @PIN_CONFIG_INPUT_ENABLE: enable the pin's input. Note that this does not
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* affect the pin's ability to drive output. 1 enables input, 0 disables
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* input.
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* @PIN_CONFIG_INPUT_SCHMITT_ENABLE: control schmitt-trigger mode on the pin.
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* If the argument != 0, schmitt-trigger mode is enabled. If it's 0,
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* schmitt-trigger mode is disabled.
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* @PIN_CONFIG_INPUT_SCHMITT: this will configure an input pin to run in
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* schmitt-trigger mode. If the schmitt-trigger has adjustable hysteresis,
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* the threshold value is given on a custom format as argument when
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* setting pins to this mode.
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* @PIN_CONFIG_INPUT_DEBOUNCE: this will configure the pin to debounce mode,
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* which means it will wait for signals to settle when reading inputs. The
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* argument gives the debounce time in usecs. Setting the
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* argument to zero turns debouncing off.
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* @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power
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* supplies, the argument to this parameter (on a custom format) tells
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* the driver which alternative power source to use.
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* @PIN_CONFIG_SLEW_RATE: if the pin can select slew rate, the argument to
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* this parameter (on a custom format) tells the driver which alternative
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* slew rate to use.
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* @PIN_CONFIG_LOW_POWER_MODE: this will configure the pin for low power
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* operation, if several modes of operation are supported these can be
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* passed in the argument on a custom form, else just use argument 1
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* to indicate low power mode, argument 0 turns low power mode off.
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* @PIN_CONFIG_OUTPUT: this will configure the pin as an output. Use argument
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* 1 to indicate high level, argument 0 to indicate low level. (Please
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* see Documentation/pinctrl.txt, section "GPIO mode pitfalls" for a
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* discussion around this parameter.)
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* @PIN_CONFIG_END: this is the last enumerator for pin configurations, if
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* you need to pass in custom configurations to the pin controller, use
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* PIN_CONFIG_END+1 as the base offset.
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*/
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#define PIN_CONFIG_BIAS_DISABLE 0
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#define PIN_CONFIG_BIAS_HIGH_IMPEDANCE 1
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#define PIN_CONFIG_BIAS_BUS_HOLD 2
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#define PIN_CONFIG_BIAS_PULL_UP 3
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#define PIN_CONFIG_BIAS_PULL_DOWN 4
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#define PIN_CONFIG_BIAS_PULL_PIN_DEFAULT 5
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#define PIN_CONFIG_DRIVE_PUSH_PULL 6
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#define PIN_CONFIG_DRIVE_OPEN_DRAIN 7
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#define PIN_CONFIG_DRIVE_OPEN_SOURCE 8
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#define PIN_CONFIG_DRIVE_STRENGTH 9
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#define PIN_CONFIG_INPUT_ENABLE 10
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#define PIN_CONFIG_INPUT_SCHMITT_ENABLE 11
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#define PIN_CONFIG_INPUT_SCHMITT 12
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#define PIN_CONFIG_INPUT_DEBOUNCE 13
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#define PIN_CONFIG_POWER_SOURCE 14
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#define PIN_CONFIG_SLEW_RATE 15
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#define PIN_CONFIG_LOW_POWER_MODE 16
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#define PIN_CONFIG_OUTPUT 17
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#define PIN_CONFIG_END 0x7FFF
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#if CONFIG_IS_ENABLED(PINCTRL_GENERIC)
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/**
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* pinctrl_generic_set_state() - generic set_state operation
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* Parse the DT node of @config and its children and handle generic properties
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* such as "pins", "groups", "functions", and pin configuration parameters.
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*
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* @pctldev: pinctrl device
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* @config: config device (pseudo device), pointing a config node in DTS
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* @return: 0 on success, or negative error code on failure
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*/
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int pinctrl_generic_set_state(struct udevice *pctldev, struct udevice *config);
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#else
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static inline int pinctrl_generic_set_state(struct udevice *pctldev,
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struct udevice *config)
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{
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return -EINVAL;
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}
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#endif
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#if CONFIG_IS_ENABLED(PINCTRL)
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/**
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* pinctrl_select_state() - set a device to a given state
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*
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* @dev: peripheral device
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* @statename: state name, like "default"
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* @return: 0 on success, or negative error code on failure
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*/
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int pinctrl_select_state(struct udevice *dev, const char *statename);
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#else
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static inline int pinctrl_select_state(struct udevice *dev,
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const char *statename)
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{
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return -EINVAL;
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}
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#endif
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/**
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* pinctrl_request() - Request a particular pinctrl function
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*
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* @dev: Device to check (UCLASS_PINCTRL)
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* @func: Function number (driver-specific)
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* @flags: Flags (driver-specific)
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* @return 0 if OK, -ve on error
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*/
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int pinctrl_request(struct udevice *dev, int func, int flags);
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/**
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* pinctrl_request_noflags() - Request a particular pinctrl function
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*
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* This is similar to pinctrl_request() but uses 0 for @flags.
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*
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* @dev: Device to check (UCLASS_PINCTRL)
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* @func: Function number (driver-specific)
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* @return 0 if OK, -ve on error
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*/
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int pinctrl_request_noflags(struct udevice *dev, int func);
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/**
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* pinctrl_get_periph_id() - get the peripheral ID for a device
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*
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* This generally looks at the peripheral's device tree node to work out the
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* peripheral ID. The return value is normally interpreted as enum periph_id.
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* so long as this is defined by the platform (which it should be).
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*
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* @dev: Pinctrl device to use for decoding
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* @periph: Device to check
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* @return peripheral ID of @periph, or -ENOENT on error
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*/
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int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph);
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#endif /* __PINCTRL_H */
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