u-boot/include/dm/uclass-internal.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
*/
#ifndef _DM_UCLASS_INTERNAL_H
#define _DM_UCLASS_INTERNAL_H
#include <dm/ofnode.h>
/*
* 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
* @returns 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_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