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https://github.com/brain-hackers/u-boot-brain
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07c9e683a4
While static configuration is useful it cannot cover every case. Sometimes board revisions are encoded in resistor straps and must be read at runtime. The easiest way to provide this information is via sysinfo, since the board can then provide a driver to read whatever is needed. Add some standard sysinfo options for this, and use them to obtain the required information. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
225 lines
6.7 KiB
C
225 lines
6.7 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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* sysinfo 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 sysinfo had a read-only serial number flash IC, we could
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* call
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*
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* ret = sysinfo_detect(dev);
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* if (ret) {
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* debug("sysinfo device not found.");
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* return ret;
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* }
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*
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* ret = sysinfo_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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/** enum sysinfo_id - Standard IDs defined by U-Boot */
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enum sysinfo_id {
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SYSINFO_ID_NONE,
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SYSINFO_ID_SMBIOS_SYSTEM_VERSION,
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SYSINFO_ID_SMBIOS_BASEBOARD_VERSION,
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/* First value available for downstream/board used */
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SYSINFO_ID_USER = 0x1000,
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};
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struct sysinfo_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 sysinfo 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 sysinfo 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 sysinfo 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 sysinfo 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 sysinfo_get_ops(dev) ((struct sysinfo_ops *)(dev)->driver->ops)
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#if CONFIG_IS_ENABLED(SYSINFO)
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/**
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* sysinfo_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 sysinfo_detect(struct udevice *dev);
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/**
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* sysinfo_get_bool() - Read a specific bool data value that describes the
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* hardware setup.
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* @dev: The sysinfo 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 sysinfo_get_bool(struct udevice *dev, int id, bool *val);
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/**
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* sysinfo_get_int() - Read a specific int data value that describes the
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* hardware setup.
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* @dev: The sysinfo 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 sysinfo_get_int(struct udevice *dev, int id, int *val);
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/**
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* sysinfo_get_str() - Read a specific string data value that describes the
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* hardware setup.
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* @dev: The sysinfo 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 sysinfo_get_str(struct udevice *dev, int id, size_t size, char *val);
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/**
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* sysinfo_get() - Return the sysinfo device for the sysinfo in question.
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* @devp: Pointer to structure to receive the sysinfo device.
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*
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* Since there can only be at most one sysinfo 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 sysinfo 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 sysinfo_get(struct udevice **devp);
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/**
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* sysinfo_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 sysinfo 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 sysinfo_get_fit_loadable(struct udevice *dev, int index, const char *type,
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const char **strp);
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#else
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static inline int sysinfo_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 sysinfo_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 sysinfo_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 sysinfo_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 sysinfo_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 sysinfo_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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