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