/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (c) 2013 Google, Inc * * (C) Copyright 2012 * Pavel Herrmann */ #ifndef _DM_UCLASS_INTERNAL_H #define _DM_UCLASS_INTERNAL_H #include /* * These next two macros DM_UCLASS_INST() and DM_UCLASS_REF() are only allowed * in code generated by dtoc, because the ordering is important and if other * instances creep in then they may mess up the ordering expected by dtoc. * * It is OK to use them with 'extern' though, since that does not actually * add a new record to the linker_list. */ /** * DM_UCLASS_INST() - Declare a uclass ready for run-time use * * This adds an actual struct uclass to a list which is found by driver model * on start-up. * * For example: * * DM_UCLASS_INST(clk) = { * .uc_drv = DM_UCLASS_DRIVER_REF(clk), * ... * }; * * @_name: Name of the uclass. This must be a valid C identifier, used by the * linker_list. */ #define DM_UCLASS_INST(_name) \ ll_entry_declare(struct uclass, _name, uclass) /** * DM_UCLASS_REF() - Get a reference to a uclass * * This is useful for referencing a uclass at build time. Before this is used, * an extern DM_UCLASS_INST() must have been declared. * * For example: * * extern DM_UCLASS_INST(clk); * * struct uclass *ucs[] = { * DM_UCLASS_REF(clk), * } * * @_name: Name of the uclass. This must be a valid C identifier, used by the * linker_list * Return: struct uclass * for the device */ #define DM_UCLASS_REF(_name) \ ll_entry_ref(struct uclass, _name, uclass) /** * uclass_set_priv() - Set the private data for a uclass * * This is normally handled by driver model, which automatically allocates * private data when an 'auto' size if provided by the uclass driver. * * Use this function to override normal operation for special situations, such * as needing to allocate a variable amount of data. * * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver * model code, since the pointer must be within the gd->dm_priv_base region. * * @uc Uclass to update * @priv New private-data pointer */ void uclass_set_priv(struct uclass *uc, void *priv); /** * uclass_find_next_free_seq() - Get the next free sequence number * * This returns the next free sequence number. This is useful only if * OF_CONTROL is not used. The next free sequence number is simply the * maximum sequence number used by all devices in the uclass + 1. The value * returned is always greater than the largest alias, if DM_SEQ_ALIAS is enabled * and the uclass has the DM_UC_FLAG_SEQ_ALIAS flag. * * This allows assigning the sequence number in the binding order. * * @uc: uclass to check * Return: The next free sequence number */ int uclass_find_next_free_seq(struct uclass *uc); /** * uclass_get_device_tail() - handle the end of a get_device call * * This handles returning an error or probing a device as needed. * * @dev: Device that needs to be probed * @ret: Error to return. If non-zero then the device is not probed * @devp: Returns the value of 'dev' if there is no error * Return: ret, if non-zero, else the result of the device_probe() call */ int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp); /** * dev_get_uclass_index() - Get uclass and index of device * @dev: - in - Device that we want the uclass/index of * @ucp: - out - A pointer to the uclass the device belongs to * * The device is not prepared for use - this is an internal function. * * Return: the index of the device in the uclass list or -ENODEV if not found. */ int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp); /** * uclass_find_device() - Return n-th child of uclass * @id: Id number of the uclass * @index: Position of the child in uclass's list * @devp: Returns pointer to device, or NULL on error * * The device is not prepared for use - this is an internal function. * The function uclass_get_device_tail() can be used to probe the device. * * Return: the uclass pointer of a child at the given index or * return NULL on error. */ int uclass_find_device(enum uclass_id id, int index, struct udevice **devp); /** * uclass_find_first_device() - Return the first device in a uclass * @id: Id number of the uclass * @devp: Returns pointer to device, or NULL on error * * The device is not prepared for use - this is an internal function. * The function uclass_get_device_tail() can be used to probe the device. * * Return: 0 if OK (found or not found), -ve on error */ int uclass_find_first_device(enum uclass_id id, struct udevice **devp); /** * uclass_find_next_device() - Return the next device in a uclass * @devp: On entry, pointer to device to lookup. On exit, returns pointer * to the next device in the same uclass, or NULL if none * * The device is not prepared for use - this is an internal function. * The function uclass_get_device_tail() can be used to probe the device. * * Return: 0 if OK (found or not found), -ve on error */ int uclass_find_next_device(struct udevice **devp); /** * uclass_find_device_by_namelen() - Find uclass device based on ID and name * * This searches for a device with the exactly given name. * * The device is NOT probed, it is merely returned. * * @id: ID to look up * @name: name of a device to find * @len: Length of @name (the uclass driver name must have the same length) * @devp: Returns pointer to device (the first one with the name) * Return: 0 if OK, -ve on error */ int uclass_find_device_by_namelen(enum uclass_id id, const char *name, int len, struct udevice **devp); /** * uclass_find_device_by_name() - Find uclass device based on ID and name * * This searches for a device with the exactly given name. * * The device is NOT probed, it is merely returned. * * @id: ID to look up * @name: name of a device to find * @devp: Returns pointer to device (the first one with the name) * Return: 0 if OK, -ve on error */ int uclass_find_device_by_name(enum uclass_id id, const char *name, struct udevice **devp); /** * uclass_find_device_by_seq() - Find uclass device based on ID and sequence * * This searches for a device with the given seq. * * The device is NOT probed, it is merely returned. * * @id: ID to look up * @seq: Sequence number to find (0=first) * @devp: Returns pointer to device (there is only one per for each seq) * Return: 0 if OK, -ENODEV if not found */ int uclass_find_device_by_seq(enum uclass_id id, int seq, struct udevice **devp); /** * uclass_find_device_by_of_offset() - Find a uclass device by device tree node * * This searches the devices in the uclass for one attached to the given * device tree node. * * The device is NOT probed, it is merely returned. * * @id: ID to look up * @node: Device tree offset to search for (if -ve then -ENODEV is returned) * @devp: Returns pointer to device (there is only one for each node) * Return: 0 if OK, -ve on error */ int uclass_find_device_by_of_offset(enum uclass_id id, int node, struct udevice **devp); /** * uclass_find_device_by_of_node() - Find a uclass device by device tree node * * This searches the devices in the uclass for one attached to the given * device tree node. * * The device is NOT probed, it is merely returned. * * @id: ID to look up * @node: Device tree offset to search for (if NULL then -ENODEV is returned) * @devp: Returns pointer to device (there is only one for each node) * Return: 0 if OK, -ve on error */ int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node, struct udevice **devp); /** * uclass_find_device_by_phandle() - Find a uclass device by phandle * * This searches the devices in the uclass for one with the given phandle. * * The device is NOT probed, it is merely returned. * * @id: ID to look up * @parent: Parent device containing the phandle pointer * @name: Name of property in the parent device node * @devp: Returns pointer to device (there is only one for each node) * Return: 0 if OK, -ENOENT if there is no @name present in the node, other * -ve on error */ int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent, const char *name, struct udevice **devp); /** * uclass_bind_device() - Associate device with a uclass * * Connect the device into uclass's list of devices. * * @dev: Pointer to the device * Return: 0 on success, -ve on error */ int uclass_bind_device(struct udevice *dev); #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) /** * uclass_pre_unbind_device() - Prepare to deassociate device with a uclass * * Call any handled needed before uclass_unbind_device() is called * * @dev: Pointer to the device * Return: 0 on success, -ve on error */ int uclass_pre_unbind_device(struct udevice *dev); /** * uclass_unbind_device() - Deassociate device with a uclass * * Disconnect the device from uclass's list of devices. * * @dev: Pointer to the device * Return: 0 on success, -ve on error */ int uclass_unbind_device(struct udevice *dev); #else static inline int uclass_pre_unbind_device(struct udevice *dev) { return 0; } static inline int uclass_unbind_device(struct udevice *dev) { return 0; } #endif /** * uclass_pre_probe_device() - Deal with a device that is about to be probed * * Perform any pre-processing that is needed by the uclass before it can be * probed. This includes the uclass' pre-probe() method and the parent * uclass' child_pre_probe() method. * * @dev: Pointer to the device * Return: 0 on success, -ve on error */ int uclass_pre_probe_device(struct udevice *dev); /** * uclass_post_probe_device() - Deal with a device that has just been probed * * Perform any post-processing of a probed device that is needed by the * uclass. * * @dev: Pointer to the device * Return: 0 on success, -ve on error */ int uclass_post_probe_device(struct udevice *dev); /** * uclass_pre_remove_device() - Handle a device which is about to be removed * * Perform any pre-processing of a device that is about to be removed. * * @dev: Pointer to the device * Return: 0 on success, -ve on error */ #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) int uclass_pre_remove_device(struct udevice *dev); #else static inline int uclass_pre_remove_device(struct udevice *dev) { return 0; } #endif /** * uclass_get_count() - Get the number of uclasses * * Returns the number of uclasses instantiated in driver model */ int uclass_get_count(void); /** * uclass_find() - Find uclass by its id * * @id: Id to serach for * Return: pointer to uclass, or NULL if not found */ struct uclass *uclass_find(enum uclass_id key); /** * uclass_destroy() - Destroy a uclass * * Destroy a uclass and all its devices * * @uc: uclass to destroy * Return: 0 on success, -ve on error */ int uclass_destroy(struct uclass *uc); #endif