mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 12:45:42 +00:00
ae59d7ca59
Add callback to configure, and de-configure, pin as a GPIO on the pin controller side. This matches similar functionality in Linux and aims to replace the ad-hoc implementations present in U-Boot. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Alex Kiernan <alex.kiernan@gmail.com> Cc: Christoph Muellner <christoph.muellner@theobroma-systems.com> Cc: Eugeniu Rosca <roscaeugeniu@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Patrick DELAUNAY <patrick.delaunay@st.com> Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Cc: Simon Glass <sjg@chromium.org>
454 lines
18 KiB
C
454 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
|
|
*/
|
|
|
|
#ifndef __PINCTRL_H
|
|
#define __PINCTRL_H
|
|
|
|
#define PINNAME_SIZE 10
|
|
#define PINMUX_SIZE 40
|
|
|
|
/**
|
|
* struct pinconf_param - pin config parameters
|
|
*
|
|
* @property: property name in DT nodes
|
|
* @param: ID for this config parameter
|
|
* @default_value: default value for this config parameter used in case
|
|
* no value is specified in DT nodes
|
|
*/
|
|
struct pinconf_param {
|
|
const char * const property;
|
|
unsigned int param;
|
|
u32 default_value;
|
|
};
|
|
|
|
/**
|
|
* struct pinctrl_ops - pin control operations, to be implemented by
|
|
* pin controller drivers.
|
|
*
|
|
* The @set_state is the only mandatory operation. You can implement your
|
|
* pinctrl driver with its own @set_state. In this case, the other callbacks
|
|
* are not required. Otherwise, generic pinctrl framework is also available;
|
|
* use pinctrl_generic_set_state for @set_state, and implement other operations
|
|
* depending on your necessity.
|
|
*
|
|
* @get_pins_count: return number of selectable named pins available
|
|
* in this driver. (necessary to parse "pins" property in DTS)
|
|
* @get_pin_name: return the pin name of the pin selector,
|
|
* called by the core to figure out which pin it shall do
|
|
* operations to. (necessary to parse "pins" property in DTS)
|
|
* @get_groups_count: return number of selectable named groups available
|
|
* in this driver. (necessary to parse "groups" property in DTS)
|
|
* @get_group_name: return the group name of the group selector,
|
|
* called by the core to figure out which pin group it shall do
|
|
* operations to. (necessary to parse "groups" property in DTS)
|
|
* @get_functions_count: return number of selectable named functions available
|
|
* in this driver. (necessary for pin-muxing)
|
|
* @get_function_name: return the function name of the muxing selector,
|
|
* called by the core to figure out which mux setting it shall map a
|
|
* certain device to. (necessary for pin-muxing)
|
|
* @pinmux_set: enable a certain muxing function with a certain pin.
|
|
* The @func_selector selects a certain function whereas @pin_selector
|
|
* selects a certain pin to be used. On simple controllers one of them
|
|
* may be ignored. (necessary for pin-muxing against a single pin)
|
|
* @pinmux_group_set: enable a certain muxing function with a certain pin
|
|
* group. The @func_selector selects a certain function whereas
|
|
* @group_selector selects a certain set of pins to be used. On simple
|
|
* controllers one of them may be ignored.
|
|
* (necessary for pin-muxing against a pin group)
|
|
* @pinconf_num_params: number of driver-specific parameters to be parsed
|
|
* from device trees (necessary for pin-configuration)
|
|
* @pinconf_params: list of driver_specific parameters to be parsed from
|
|
* device trees (necessary for pin-configuration)
|
|
* @pinconf_set: configure an individual pin with a given parameter.
|
|
* (necessary for pin-configuration against a single pin)
|
|
* @pinconf_group_set: configure all pins in a group with a given parameter.
|
|
* (necessary for pin-configuration against a pin group)
|
|
* @set_state: do pinctrl operations specified by @config, a pseudo device
|
|
* pointing a config node. (necessary for pinctrl_full)
|
|
* @set_state_simple: do needed pinctrl operations for a peripherl @periph.
|
|
* (necessary for pinctrl_simple)
|
|
* @get_pin_muxing: display the muxing of a given pin.
|
|
* @gpio_request_enable: requests and enables GPIO on a certain pin.
|
|
* Implement this only if you can mux every pin individually as GPIO. The
|
|
* affected GPIO range is passed along with an offset(pin number) into that
|
|
* specific GPIO range - function selectors and pin groups are orthogonal
|
|
* to this, the core will however make sure the pins do not collide.
|
|
* @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
|
|
* @gpio_request_enable
|
|
*/
|
|
struct pinctrl_ops {
|
|
int (*get_pins_count)(struct udevice *dev);
|
|
const char *(*get_pin_name)(struct udevice *dev, unsigned selector);
|
|
int (*get_groups_count)(struct udevice *dev);
|
|
const char *(*get_group_name)(struct udevice *dev, unsigned selector);
|
|
int (*get_functions_count)(struct udevice *dev);
|
|
const char *(*get_function_name)(struct udevice *dev,
|
|
unsigned selector);
|
|
int (*pinmux_set)(struct udevice *dev, unsigned pin_selector,
|
|
unsigned func_selector);
|
|
int (*pinmux_group_set)(struct udevice *dev, unsigned group_selector,
|
|
unsigned func_selector);
|
|
unsigned int pinconf_num_params;
|
|
const struct pinconf_param *pinconf_params;
|
|
int (*pinconf_set)(struct udevice *dev, unsigned pin_selector,
|
|
unsigned param, unsigned argument);
|
|
int (*pinconf_group_set)(struct udevice *dev, unsigned group_selector,
|
|
unsigned param, unsigned argument);
|
|
int (*set_state)(struct udevice *dev, struct udevice *config);
|
|
|
|
/* for pinctrl-simple */
|
|
int (*set_state_simple)(struct udevice *dev, struct udevice *periph);
|
|
/**
|
|
* request() - Request a particular pinctrl function
|
|
*
|
|
* This activates the selected function.
|
|
*
|
|
* @dev: Device to adjust (UCLASS_PINCTRL)
|
|
* @func: Function number (driver-specific)
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*request)(struct udevice *dev, int func, int flags);
|
|
|
|
/**
|
|
* get_periph_id() - get the peripheral ID for a device
|
|
*
|
|
* This generally looks at the peripheral's device tree node to work
|
|
* out the peripheral ID. The return value is normally interpreted as
|
|
* enum periph_id. so long as this is defined by the platform (which it
|
|
* should be).
|
|
*
|
|
* @dev: Pinctrl device to use for decoding
|
|
* @periph: Device to check
|
|
* @return peripheral ID of @periph, or -ENOENT on error
|
|
*/
|
|
int (*get_periph_id)(struct udevice *dev, struct udevice *periph);
|
|
|
|
/**
|
|
* get_gpio_mux() - get the mux value for a particular GPIO
|
|
*
|
|
* This allows the raw mux value for a GPIO to be obtained. It is
|
|
* useful for displaying the function being used by that GPIO, such
|
|
* as with the 'gpio' command. This function is internal to the GPIO
|
|
* subsystem and should not be used by generic code. Typically it is
|
|
* used by a GPIO driver with knowledge of the SoC pinctrl setup.
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @banknum: GPIO bank number
|
|
* @index: GPIO index within the bank
|
|
* @return mux value (SoC-specific, e.g. 0 for input, 1 for output)
|
|
*/
|
|
int (*get_gpio_mux)(struct udevice *dev, int banknum, int index);
|
|
|
|
/**
|
|
* get_pin_muxing() - show pin muxing
|
|
*
|
|
* This allows to display the muxing of a given pin. It's useful for
|
|
* debug purpose to know if a pin is configured as GPIO or as an
|
|
* alternate function and which one.
|
|
* Typically it is used by a PINCTRL driver with knowledge of the SoC
|
|
* pinctrl setup.
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @selector: Pin selector
|
|
* @buf Pin's muxing description
|
|
* @size Pin's muxing description length
|
|
* return 0 if OK, -ve on error
|
|
*/
|
|
int (*get_pin_muxing)(struct udevice *dev, unsigned int selector,
|
|
char *buf, int size);
|
|
|
|
/**
|
|
* gpio_request_enable: requests and enables GPIO on a certain pin.
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @selector: Pin selector
|
|
* return 0 if OK, -ve on error
|
|
*/
|
|
int (*gpio_request_enable)(struct udevice *dev, unsigned int selector);
|
|
|
|
/**
|
|
* gpio_disable_free: free up GPIO muxing on a certain pin.
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @selector: Pin selector
|
|
* return 0 if OK, -ve on error
|
|
*/
|
|
int (*gpio_disable_free)(struct udevice *dev, unsigned int selector);
|
|
};
|
|
|
|
#define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops)
|
|
|
|
/**
|
|
* Generic pin configuration paramters
|
|
*
|
|
* enum pin_config_param - possible pin configuration parameters
|
|
* @PIN_CONFIG_BIAS_BUS_HOLD: the pin will be set to weakly latch so that it
|
|
* weakly drives the last value on a tristate bus, also known as a "bus
|
|
* holder", "bus keeper" or "repeater". This allows another device on the
|
|
* bus to change the value by driving the bus high or low and switching to
|
|
* tristate. The argument is ignored.
|
|
* @PIN_CONFIG_BIAS_DISABLE: disable any pin bias on the pin, a
|
|
* transition from say pull-up to pull-down implies that you disable
|
|
* pull-up in the process, this setting disables all biasing.
|
|
* @PIN_CONFIG_BIAS_HIGH_IMPEDANCE: the pin will be set to a high impedance
|
|
* mode, also know as "third-state" (tristate) or "high-Z" or "floating".
|
|
* On output pins this effectively disconnects the pin, which is useful
|
|
* if for example some other pin is going to drive the signal connected
|
|
* to it for a while. Pins used for input are usually always high
|
|
* impedance.
|
|
* @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
|
|
* impedance to GROUND). If the argument is != 0 pull-down is enabled,
|
|
* if it is 0, pull-down is total, i.e. the pin is connected to GROUND.
|
|
* @PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: the pin will be pulled up or down based
|
|
* on embedded knowledge of the controller hardware, like current mux
|
|
* function. The pull direction and possibly strength too will normally
|
|
* be decided completely inside the hardware block and not be readable
|
|
* from the kernel side.
|
|
* If the argument is != 0 pull up/down is enabled, if it is 0, the
|
|
* configuration is ignored. The proper way to disable it is to use
|
|
* @PIN_CONFIG_BIAS_DISABLE.
|
|
* @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
|
|
* impedance to VDD). If the argument is != 0 pull-up is enabled,
|
|
* if it is 0, pull-up is total, i.e. the pin is connected to VDD.
|
|
* @PIN_CONFIG_DRIVE_OPEN_DRAIN: the pin will be driven with open drain (open
|
|
* collector) which means it is usually wired with other output ports
|
|
* which are then pulled up with an external resistor. Setting this
|
|
* config will enable open drain mode, the argument is ignored.
|
|
* @PIN_CONFIG_DRIVE_OPEN_SOURCE: the pin will be driven with open source
|
|
* (open emitter). Setting this config will enable open source mode, the
|
|
* argument is ignored.
|
|
* @PIN_CONFIG_DRIVE_PUSH_PULL: the pin will be driven actively high and
|
|
* low, this is the most typical case and is typically achieved with two
|
|
* active transistors on the output. Setting this config will enable
|
|
* push-pull mode, the argument is ignored.
|
|
* @PIN_CONFIG_DRIVE_STRENGTH: the pin will sink or source at most the current
|
|
* passed as argument. The argument is in mA.
|
|
* @PIN_CONFIG_INPUT_DEBOUNCE: this will configure the pin to debounce mode,
|
|
* which means it will wait for signals to settle when reading inputs. The
|
|
* argument gives the debounce time in usecs. Setting the
|
|
* argument to zero turns debouncing off.
|
|
* @PIN_CONFIG_INPUT_ENABLE: enable the pin's input. Note that this does not
|
|
* affect the pin's ability to drive output. 1 enables input, 0 disables
|
|
* input.
|
|
* @PIN_CONFIG_INPUT_SCHMITT: this will configure an input pin to run in
|
|
* schmitt-trigger mode. If the schmitt-trigger has adjustable hysteresis,
|
|
* the threshold value is given on a custom format as argument when
|
|
* setting pins to this mode.
|
|
* @PIN_CONFIG_INPUT_SCHMITT_ENABLE: control schmitt-trigger mode on the pin.
|
|
* If the argument != 0, schmitt-trigger mode is enabled. If it's 0,
|
|
* schmitt-trigger mode is disabled.
|
|
* @PIN_CONFIG_LOW_POWER_MODE: this will configure the pin for low power
|
|
* operation, if several modes of operation are supported these can be
|
|
* passed in the argument on a custom form, else just use argument 1
|
|
* to indicate low power mode, argument 0 turns low power mode off.
|
|
* @PIN_CONFIG_OUTPUT_ENABLE: this will enable the pin's output mode
|
|
* without driving a value there. For most platforms this reduces to
|
|
* enable the output buffers and then let the pin controller current
|
|
* configuration (eg. the currently selected mux function) drive values on
|
|
* the line. Use argument 1 to enable output mode, argument 0 to disable
|
|
* it.
|
|
* @PIN_CONFIG_OUTPUT: this will configure the pin as an output and drive a
|
|
* value on the line. Use argument 1 to indicate high level, argument 0 to
|
|
* indicate low level. (Please see Documentation/driver-api/pinctl.rst,
|
|
* section "GPIO mode pitfalls" for a discussion around this parameter.)
|
|
* @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power
|
|
* supplies, the argument to this parameter (on a custom format) tells
|
|
* the driver which alternative power source to use.
|
|
* @PIN_CONFIG_SLEEP_HARDWARE_STATE: indicate this is sleep related state.
|
|
* @PIN_CONFIG_SLEW_RATE: if the pin can select slew rate, the argument to
|
|
* this parameter (on a custom format) tells the driver which alternative
|
|
* slew rate to use.
|
|
* @PIN_CONFIG_SKEW_DELAY: if the pin has programmable skew rate (on inputs)
|
|
* or latch delay (on outputs) this parameter (in a custom format)
|
|
* specifies the clock skew or latch delay. It typically controls how
|
|
* many double inverters are put in front of the line.
|
|
* @PIN_CONFIG_END: this is the last enumerator for pin configurations, if
|
|
* you need to pass in custom configurations to the pin controller, use
|
|
* PIN_CONFIG_END+1 as the base offset.
|
|
* @PIN_CONFIG_MAX: this is the maximum configuration value that can be
|
|
* presented using the packed format.
|
|
*/
|
|
enum pin_config_param {
|
|
PIN_CONFIG_BIAS_BUS_HOLD,
|
|
PIN_CONFIG_BIAS_DISABLE,
|
|
PIN_CONFIG_BIAS_HIGH_IMPEDANCE,
|
|
PIN_CONFIG_BIAS_PULL_DOWN,
|
|
PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
|
|
PIN_CONFIG_BIAS_PULL_UP,
|
|
PIN_CONFIG_DRIVE_OPEN_DRAIN,
|
|
PIN_CONFIG_DRIVE_OPEN_SOURCE,
|
|
PIN_CONFIG_DRIVE_PUSH_PULL,
|
|
PIN_CONFIG_DRIVE_STRENGTH,
|
|
PIN_CONFIG_INPUT_DEBOUNCE,
|
|
PIN_CONFIG_INPUT_ENABLE,
|
|
PIN_CONFIG_INPUT_SCHMITT,
|
|
PIN_CONFIG_INPUT_SCHMITT_ENABLE,
|
|
PIN_CONFIG_LOW_POWER_MODE,
|
|
PIN_CONFIG_OUTPUT_ENABLE,
|
|
PIN_CONFIG_OUTPUT,
|
|
PIN_CONFIG_POWER_SOURCE,
|
|
PIN_CONFIG_SLEEP_HARDWARE_STATE,
|
|
PIN_CONFIG_SLEW_RATE,
|
|
PIN_CONFIG_SKEW_DELAY,
|
|
PIN_CONFIG_END = 0x7F,
|
|
PIN_CONFIG_MAX = 0xFF,
|
|
};
|
|
|
|
#if CONFIG_IS_ENABLED(PINCTRL_GENERIC)
|
|
/**
|
|
* pinctrl_generic_set_state() - generic set_state operation
|
|
* Parse the DT node of @config and its children and handle generic properties
|
|
* such as "pins", "groups", "functions", and pin configuration parameters.
|
|
*
|
|
* @pctldev: pinctrl device
|
|
* @config: config device (pseudo device), pointing a config node in DTS
|
|
* @return: 0 on success, or negative error code on failure
|
|
*/
|
|
int pinctrl_generic_set_state(struct udevice *pctldev, struct udevice *config);
|
|
#else
|
|
static inline int pinctrl_generic_set_state(struct udevice *pctldev,
|
|
struct udevice *config)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
#if CONFIG_IS_ENABLED(PINCTRL)
|
|
/**
|
|
* pinctrl_select_state() - set a device to a given state
|
|
*
|
|
* @dev: peripheral device
|
|
* @statename: state name, like "default"
|
|
* @return: 0 on success, or negative error code on failure
|
|
*/
|
|
int pinctrl_select_state(struct udevice *dev, const char *statename);
|
|
#else
|
|
static inline int pinctrl_select_state(struct udevice *dev,
|
|
const char *statename)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* pinctrl_request() - Request a particular pinctrl function
|
|
*
|
|
* @dev: Device to check (UCLASS_PINCTRL)
|
|
* @func: Function number (driver-specific)
|
|
* @flags: Flags (driver-specific)
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int pinctrl_request(struct udevice *dev, int func, int flags);
|
|
|
|
/**
|
|
* pinctrl_request_noflags() - Request a particular pinctrl function
|
|
*
|
|
* This is similar to pinctrl_request() but uses 0 for @flags.
|
|
*
|
|
* @dev: Device to check (UCLASS_PINCTRL)
|
|
* @func: Function number (driver-specific)
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int pinctrl_request_noflags(struct udevice *dev, int func);
|
|
|
|
/**
|
|
* pinctrl_get_periph_id() - get the peripheral ID for a device
|
|
*
|
|
* This generally looks at the peripheral's device tree node to work out the
|
|
* peripheral ID. The return value is normally interpreted as enum periph_id.
|
|
* so long as this is defined by the platform (which it should be).
|
|
*
|
|
* @dev: Pinctrl device to use for decoding
|
|
* @periph: Device to check
|
|
* @return peripheral ID of @periph, or -ENOENT on error
|
|
*/
|
|
int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph);
|
|
|
|
/**
|
|
* pinctrl_decode_pin_config() - decode pin configuration flags
|
|
*
|
|
* This decodes some of the PIN_CONFIG values into flags, with each value
|
|
* being (1 << pin_cfg). This does not support things with values like the
|
|
* slew rate.
|
|
*
|
|
* @blob: Device tree blob
|
|
* @node: Node containing the PIN_CONFIG values
|
|
* @return decoded flag value, or -ve on error
|
|
*/
|
|
int pinctrl_decode_pin_config(const void *blob, int node);
|
|
|
|
/**
|
|
* pinctrl_get_gpio_mux() - get the mux value for a particular GPIO
|
|
*
|
|
* This allows the raw mux value for a GPIO to be obtained. It is
|
|
* useful for displaying the function being used by that GPIO, such
|
|
* as with the 'gpio' command. This function is internal to the GPIO
|
|
* subsystem and should not be used by generic code. Typically it is
|
|
* used by a GPIO driver with knowledge of the SoC pinctrl setup.
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @banknum: GPIO bank number
|
|
* @index: GPIO index within the bank
|
|
* @return mux value (SoC-specific, e.g. 0 for input, 1 for output)
|
|
*/
|
|
int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index);
|
|
|
|
/**
|
|
* pinctrl_get_pin_muxing() - Returns the muxing description
|
|
*
|
|
* This allows to display the muxing description of the given pin for
|
|
* debug purpose
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @selector Pin index within pin-controller
|
|
* @buf Pin's muxing description
|
|
* @size Pin's muxing description length
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf,
|
|
int size);
|
|
|
|
/**
|
|
* pinctrl_get_pins_count() - display pin-controller pins number
|
|
*
|
|
* This allows to know the number of pins owned by a given pin-controller
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @return pins number if OK, -ve on error
|
|
*/
|
|
int pinctrl_get_pins_count(struct udevice *dev);
|
|
|
|
/**
|
|
* pinctrl_get_pin_name() - Returns the pin's name
|
|
*
|
|
* This allows to display the pin's name for debug purpose
|
|
*
|
|
* @dev: Pinctrl device to use
|
|
* @selector Pin index within pin-controller
|
|
* @buf Pin's name
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf,
|
|
int size);
|
|
|
|
/**
|
|
* pinctrl_gpio_request() - request a single pin to be used as GPIO
|
|
*
|
|
* @dev: GPIO peripheral device
|
|
* @offset: the GPIO pin offset from the GPIO controller
|
|
* @return: 0 on success, or negative error code on failure
|
|
*/
|
|
int pinctrl_gpio_request(struct udevice *dev, unsigned offset);
|
|
|
|
/**
|
|
* pinctrl_gpio_free() - free a single pin used as GPIO
|
|
*
|
|
* @dev: GPIO peripheral device
|
|
* @offset: the GPIO pin offset from the GPIO controller
|
|
* @return: 0 on success, or negative error code on failure
|
|
*/
|
|
int pinctrl_gpio_free(struct udevice *dev, unsigned offset);
|
|
|
|
#endif /* __PINCTRL_H */
|