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![Simon Glass](/assets/img/avatar_default.png)
Add dev_get_parent() as a convenience to obtain the parent of a device. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@ti.com> Acked-by: Heiko Schocher <hs@denx.de>
326 lines
11 KiB
C
326 lines
11 KiB
C
/*
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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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* Marek Vasut <marex@denx.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _DM_DEVICE_H
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#define _DM_DEVICE_H
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#include <dm/uclass-id.h>
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#include <linker_lists.h>
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#include <linux/list.h>
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struct driver_info;
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/* Driver is active (probed). Cleared when it is removed */
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#define DM_FLAG_ACTIVATED (1 << 0)
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/* DM is responsible for allocating and freeing platdata */
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#define DM_FLAG_ALLOC_PDATA (1 << 1)
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/* DM should init this device prior to relocation */
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#define DM_FLAG_PRE_RELOC (1 << 2)
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/**
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* struct udevice - An instance of a driver
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*
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* This holds information about a device, which is a driver bound to a
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* particular port or peripheral (essentially a driver instance).
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*
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* A device will come into existence through a 'bind' call, either due to
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* a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node
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* in the device tree (in which case of_offset is >= 0). In the latter case
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* we translate the device tree information into platdata in a function
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* implemented by the driver ofdata_to_platdata method (called just before the
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* probe method if the device has a device tree node.
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*
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* All three of platdata, priv and uclass_priv can be allocated by the
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* driver, or you can use the auto_alloc_size members of struct driver and
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* struct uclass_driver to have driver model do this automatically.
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*
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* @driver: The driver used by this device
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* @name: Name of device, typically the FDT node name
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* @platdata: Configuration data for this device
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* @of_offset: Device tree node offset for this device (- for none)
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* @of_id: Pointer to the udevice_id structure which created the device
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* @parent: Parent of this device, or NULL for the top level device
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* @priv: Private data for this device
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* @uclass: Pointer to uclass for this device
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* @uclass_priv: The uclass's private data for this device
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* @parent_priv: The parent's private data for this device
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* @uclass_node: Used by uclass to link its devices
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* @child_head: List of children of this device
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* @sibling_node: Next device in list of all devices
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* @flags: Flags for this device DM_FLAG_...
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* @req_seq: Requested sequence number for this device (-1 = any)
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* @seq: Allocated sequence number for this device (-1 = none). This is set up
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* when the device is probed and will be unique within the device's uclass.
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*/
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struct udevice {
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struct driver *driver;
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const char *name;
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void *platdata;
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int of_offset;
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const struct udevice_id *of_id;
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struct udevice *parent;
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void *priv;
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struct uclass *uclass;
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void *uclass_priv;
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void *parent_priv;
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struct list_head uclass_node;
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struct list_head child_head;
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struct list_head sibling_node;
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uint32_t flags;
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int req_seq;
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int seq;
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};
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/* Maximum sequence number supported */
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#define DM_MAX_SEQ 999
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/* Returns the operations for a device */
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#define device_get_ops(dev) (dev->driver->ops)
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/* Returns non-zero if the device is active (probed and not removed) */
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#define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED)
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/**
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* struct udevice_id - Lists the compatible strings supported by a driver
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* @compatible: Compatible string
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* @data: Data for this compatible string
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*/
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struct udevice_id {
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const char *compatible;
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ulong data;
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};
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#ifdef CONFIG_OF_CONTROL
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#define of_match_ptr(_ptr) (_ptr)
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#else
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#define of_match_ptr(_ptr) NULL
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#endif /* CONFIG_OF_CONTROL */
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/**
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* struct driver - A driver for a feature or peripheral
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*
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* This holds methods for setting up a new device, and also removing it.
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* The device needs information to set itself up - this is provided either
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* by platdata or a device tree node (which we find by looking up
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* matching compatible strings with of_match).
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*
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* Drivers all belong to a uclass, representing a class of devices of the
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* same type. Common elements of the drivers can be implemented in the uclass,
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* or the uclass can provide a consistent interface to the drivers within
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* it.
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*
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* @name: Device name
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* @id: Identiies the uclass we belong to
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* @of_match: List of compatible strings to match, and any identifying data
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* for each.
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* @bind: Called to bind a device to its driver
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* @probe: Called to probe a device, i.e. activate it
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* @remove: Called to remove a device, i.e. de-activate it
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* @unbind: Called to unbind a device from its driver
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* @ofdata_to_platdata: Called before probe to decode device tree data
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* @child_pre_probe: Called before a child device is probed. The device has
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* memory allocated but it has not yet been probed.
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* @child_post_remove: Called after a child device is removed. The device
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* has memory allocated but its device_remove() method has been called.
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* @priv_auto_alloc_size: If non-zero this is the size of the private data
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* to be allocated in the device's ->priv pointer. If zero, then the driver
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* is responsible for allocating any data required.
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* @platdata_auto_alloc_size: If non-zero this is the size of the
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* platform data to be allocated in the device's ->platdata pointer.
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* This is typically only useful for device-tree-aware drivers (those with
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* an of_match), since drivers which use platdata will have the data
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* provided in the U_BOOT_DEVICE() instantiation.
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* @per_child_auto_alloc_size: Each device can hold private data owned by
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* its parent. If required this will be automatically allocated if this
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* value is non-zero.
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* TODO(sjg@chromium.org): I'm considering dropping this, and just having
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* device_probe_child() pass it in. So far the use case for allocating it
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* is SPI, but I found that unsatisfactory. Since it is here I will leave it
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* until things are clearer.
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* @ops: Driver-specific operations. This is typically a list of function
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* pointers defined by the driver, to implement driver functions required by
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* the uclass.
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* @flags: driver flags - see DM_FLAGS_...
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*/
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struct driver {
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char *name;
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enum uclass_id id;
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const struct udevice_id *of_match;
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int (*bind)(struct udevice *dev);
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int (*probe)(struct udevice *dev);
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int (*remove)(struct udevice *dev);
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int (*unbind)(struct udevice *dev);
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int (*ofdata_to_platdata)(struct udevice *dev);
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int (*child_pre_probe)(struct udevice *dev);
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int (*child_post_remove)(struct udevice *dev);
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int priv_auto_alloc_size;
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int platdata_auto_alloc_size;
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int per_child_auto_alloc_size;
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const void *ops; /* driver-specific operations */
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uint32_t flags;
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};
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/* Declare a new U-Boot driver */
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#define U_BOOT_DRIVER(__name) \
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ll_entry_declare(struct driver, __name, driver)
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/**
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* dev_get_platdata() - Get the platform data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return platform data, or NULL if none
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*/
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void *dev_get_platdata(struct udevice *dev);
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/**
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* dev_get_parentdata() - Get the parent data for a device
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*
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* The parent data is data stored in the device but owned by the parent.
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* For example, a USB device may have parent data which contains information
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* about how to talk to the device over USB.
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return parent data, or NULL if none
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*/
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void *dev_get_parentdata(struct udevice *dev);
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/**
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* dev_get_priv() - Get the private data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return private data, or NULL if none
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*/
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void *dev_get_priv(struct udevice *dev);
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/**
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* struct dev_get_parent() - Get the parent of a device
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*
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* @child: Child to check
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* @return parent of child, or NULL if this is the root device
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*/
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struct udevice *dev_get_parent(struct udevice *child);
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/**
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* dev_get_of_data() - get the device tree data used to bind a device
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*
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* When a device is bound using a device tree node, it matches a
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* particular compatible string as in struct udevice_id. This function
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* returns the associated data value for that compatible string
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*/
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ulong dev_get_of_data(struct udevice *dev);
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/**
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* device_get_child() - Get the child of a device by index
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*
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* Returns the numbered child, 0 being the first. This does not use
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* sequence numbers, only the natural order.
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*
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* @dev: Parent device to check
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* @index: Child index
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* @devp: Returns pointer to device
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*/
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int device_get_child(struct udevice *parent, int index, struct udevice **devp);
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/**
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* device_find_child_by_seq() - Find a child device based on a sequence
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*
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* This searches for a device with the given seq or req_seq.
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*
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* For seq, if an active device has this sequence it will be returned.
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* If there is no such device then this will return -ENODEV.
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*
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* For req_seq, if a device (whether activated or not) has this req_seq
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* value, that device will be returned. This is a strong indication that
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* the device will receive that sequence when activated.
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*
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* @parent: Parent device
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* @seq_or_req_seq: Sequence number to find (0=first)
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* @find_req_seq: true to find req_seq, false to find seq
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* @devp: Returns pointer to device (there is only one per for each seq).
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* Set to NULL if none is found
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* @return 0 if OK, -ve on error
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*/
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int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
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bool find_req_seq, struct udevice **devp);
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/**
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* device_get_child_by_seq() - Get a child device based on a sequence
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*
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* If an active device has this sequence it will be returned. If there is no
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* such device then this will check for a device that is requesting this
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* sequence.
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*
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* The device is probed to activate it ready for use.
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*
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* @parent: Parent device
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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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* Set to NULL if none is found
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* @return 0 if OK, -ve on error
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*/
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int device_get_child_by_seq(struct udevice *parent, int seq,
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struct udevice **devp);
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/**
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* device_find_child_by_of_offset() - Find a child device based on FDT offset
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*
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* Locates a child device by its device tree offset.
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*
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* @parent: Parent device
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* @of_offset: Device tree offset to find
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* @devp: Returns pointer to device if found, otherwise this is set to NULL
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* @return 0 if OK, -ve on error
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*/
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int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
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struct udevice **devp);
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/**
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* device_get_child_by_of_offset() - Get a child device based on FDT offset
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*
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* Locates a child device by its device tree offset.
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*
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* The device is probed to activate it ready for use.
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*
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* @parent: Parent device
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* @of_offset: Device tree offset to find
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* @devp: Returns pointer to device if found, otherwise this is set to NULL
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* @return 0 if OK, -ve on error
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*/
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int device_get_child_by_of_offset(struct udevice *parent, int seq,
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struct udevice **devp);
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/**
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* device_find_first_child() - Find the first child of a device
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*
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* @parent: Parent device to search
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* @devp: Returns first child device, or NULL if none
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* @return 0
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*/
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int device_find_first_child(struct udevice *parent, struct udevice **devp);
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/**
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* device_find_first_child() - Find the first child of a device
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*
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* @devp: Pointer to previous child device on entry. Returns pointer to next
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* child device, or NULL if none
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* @return 0
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*/
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int device_find_next_child(struct udevice **devp);
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#endif
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