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02806e9ac1
Useful to avoid #ifdef throughout the code that uses the board driver API. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org>
214 lines
6.4 KiB
C
214 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2017
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* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
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*/
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/*
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* This uclass encapsulates hardware methods to gather information about a
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* board or a specific device such as hard-wired GPIOs on GPIO expanders,
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* read-only data in flash ICs, or similar.
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*
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* The interface offers functions to read the usual standard data types (bool,
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* int, string) from the device, each of which is identified by a static
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* numeric ID (which will usually be defined as a enum in a header file).
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*
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* If for example the board had a read-only serial number flash IC, we could
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* call
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*
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* ret = board_detect(dev);
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* if (ret) {
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* debug("board device not found.");
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* return ret;
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* }
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*
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* ret = board_get_int(dev, ID_SERIAL_NUMBER, &serial);
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* if (ret) {
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* debug("Error when reading serial number from device.");
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* return ret;
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* }
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*
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* to read the serial number.
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*/
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#if CONFIG_IS_ENABLED(BOARD)
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struct board_ops {
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/**
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* detect() - Run the hardware info detection procedure for this
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* device.
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* @dev: The device containing the information
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*
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* This operation might take a long time (e.g. read from EEPROM,
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* check the presence of a device on a bus etc.), hence this is not
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* done in the probe() method, but later during operation in this
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* dedicated method.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int (*detect)(struct udevice *dev);
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/**
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* get_bool() - Read a specific bool data value that describes the
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* hardware setup.
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* @dev: The board instance to gather the data.
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* @id: A unique identifier for the bool value to be read.
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* @val: Pointer to a buffer that receives the value read.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int (*get_bool)(struct udevice *dev, int id, bool *val);
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/**
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* get_int() - Read a specific int data value that describes the
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* hardware setup.
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* @dev: The board instance to gather the data.
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* @id: A unique identifier for the int value to be read.
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* @val: Pointer to a buffer that receives the value read.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int (*get_int)(struct udevice *dev, int id, int *val);
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/**
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* get_str() - Read a specific string data value that describes the
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* hardware setup.
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* @dev: The board instance to gather the data.
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* @id: A unique identifier for the string value to be read.
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* @size: The size of the buffer to receive the string data.
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* @val: Pointer to a buffer that receives the value read.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int (*get_str)(struct udevice *dev, int id, size_t size, char *val);
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/**
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* get_fit_loadable - Get the name of an image to load from FIT
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* This function can be used to provide the image names based on runtime
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* detection. A classic use-case would when DTBOs are used to describe
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* additionnal daughter cards.
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*
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* @dev: The board instance to gather the data.
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* @index: Index of the image. Starts at 0 and gets incremented
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* after each call to this function.
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* @type: The type of image. For example, "fdt" for DTBs
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* @strp: A pointer to string. Untouched if the function fails
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*
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* Return: 0 if OK, -ENOENT if no loadable is available else -ve on
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* error.
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*/
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int (*get_fit_loadable)(struct udevice *dev, int index,
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const char *type, const char **strp);
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};
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#define board_get_ops(dev) ((struct board_ops *)(dev)->driver->ops)
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/**
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* board_detect() - Run the hardware info detection procedure for this device.
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*
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* @dev: The device containing the information
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*
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* Return: 0 if OK, -ve on error.
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*/
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int board_detect(struct udevice *dev);
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/**
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* board_get_bool() - Read a specific bool data value that describes the
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* hardware setup.
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* @dev: The board instance to gather the data.
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* @id: A unique identifier for the bool value to be read.
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* @val: Pointer to a buffer that receives the value read.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int board_get_bool(struct udevice *dev, int id, bool *val);
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/**
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* board_get_int() - Read a specific int data value that describes the
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* hardware setup.
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* @dev: The board instance to gather the data.
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* @id: A unique identifier for the int value to be read.
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* @val: Pointer to a buffer that receives the value read.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int board_get_int(struct udevice *dev, int id, int *val);
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/**
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* board_get_str() - Read a specific string data value that describes the
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* hardware setup.
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* @dev: The board instance to gather the data.
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* @id: A unique identifier for the string value to be read.
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* @size: The size of the buffer to receive the string data.
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* @val: Pointer to a buffer that receives the value read.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int board_get_str(struct udevice *dev, int id, size_t size, char *val);
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/**
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* board_get() - Return the board device for the board in question.
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* @devp: Pointer to structure to receive the board device.
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*
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* Since there can only be at most one board instance, the API can supply a
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* function that returns the unique device. This is especially useful for use
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* in board files.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int board_get(struct udevice **devp);
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/**
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* board_get_fit_loadable - Get the name of an image to load from FIT
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* This function can be used to provide the image names based on runtime
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* detection. A classic use-case would when DTBOs are used to describe
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* additionnal daughter cards.
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*
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* @dev: The board instance to gather the data.
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* @index: Index of the image. Starts at 0 and gets incremented
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* after each call to this function.
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* @type: The type of image. For example, "fdt" for DTBs
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* @strp: A pointer to string. Untouched if the function fails
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*
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*
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* Return: 0 if OK, -ENOENT if no loadable is available else -ve on
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* error.
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*/
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int board_get_fit_loadable(struct udevice *dev, int index,
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const char *type, const char **strp);
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#else
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static inline int board_detect(struct udevice *dev)
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{
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return -ENOSYS;
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}
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static inline int board_get_bool(struct udevice *dev, int id, bool *val)
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{
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return -ENOSYS;
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}
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static inline int board_get_int(struct udevice *dev, int id, int *val)
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{
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return -ENOSYS;
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}
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static inline int board_get_str(struct udevice *dev, int id, size_t size,
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char *val)
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{
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return -ENOSYS;
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}
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static inline int board_get(struct udevice **devp)
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{
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return -ENOSYS;
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}
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static inline int board_get_fit_loadable(struct udevice *dev, int index,
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const char *type, const char **strp)
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{
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return -ENOSYS;
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}
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#endif
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