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aa5511e77b
device_probe returns early when the device is already activated. Add a note to the documentation that it can be used on already activated devices. Signed-off-by: Michal Suchanek <msuchanek@suse.de>
440 lines
14 KiB
C
440 lines
14 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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* Marek Vasut <marex@denx.de>
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*/
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#ifndef _DM_DEVICE_INTERNAL_H
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#define _DM_DEVICE_INTERNAL_H
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#include <event.h>
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#include <linker_lists.h>
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#include <dm/ofnode.h>
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struct device_node;
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struct driver_info;
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struct udevice;
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/*
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* These two macros DM_DEVICE_INST and DM_DEVICE_REF are only allowed in code
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* generated by dtoc, because the ordering is important and if other instances
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* 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_DEVICE_INST() - Declare a bound device ready for run-time use
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*
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* This adds an actual struct udevice 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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* extern U_BOOT_DRIVER(sandbox_fixed_clock);
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* extern DM_UCLASS_INST(clk);
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*
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* DM_DEVICE_INST(clk_fixed) = {
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* .driver = DM_DRIVER_REF(sandbox_fixed_clock),
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* .name = "sandbox_fixed_clock",
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* .plat_ = &_sandbox_fixed_clock_plat_clk_fixed,
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* .uclass = DM_UCLASS_REF(clk),
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* ...
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* .seq_ = 0,
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* };
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*
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* @_name: Name of the udevice. 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_DEVICE_INST(_name) \
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ll_entry_declare(struct udevice, _name, udevice)
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/**
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* DM_DEVICE_REF() - Get a reference to a device
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*
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* This is useful in data structures and code for referencing a udevice at
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* build time. Before this is used, an extern DM_DEVICE_INST() must have been
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* declared.
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*
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* For example:
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*
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* extern DM_DEVICE_INST(clk_fixed);
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*
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* struct udevice *devs[] = {
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* DM_DEVICE_REF(clk_fixed),
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* };
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*
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* @_name: Name of the udevice. This must be a valid C identifier, used by the
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* linker_list
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* @returns struct udevice * for the device
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*/
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#define DM_DEVICE_REF(_name) \
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ll_entry_ref(struct udevice, _name, udevice)
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/**
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* DM_DEVICE_GET() - Get a pointer to a given device
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*
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* This is similar to DM_DEVICE_REF() except that it does not need the extern
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* declaration before it. However it cannot be used in a data structures, only
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* in code within a function.
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*
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* For example:
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*
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* void some_function() {
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* struct udevice *dev = DM_DEVICE_GET(clk_fixed);
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* ...
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* }
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*/
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#define DM_DEVICE_GET(__name) \
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ll_entry_get(struct udevice, __name, udevice)
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/**
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* device_bind() - Create a device and bind it to a driver
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*
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* Called to set up a new device attached to a driver. The device will either
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* have plat, or a device tree node which can be used to create the
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* plat.
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*
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* Once bound a device exists but is not yet active until device_probe() is
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* called.
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*
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* @parent: Pointer to device's parent, under which this driver will exist
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* @drv: Device's driver
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* @name: Name of device (e.g. device tree node name)
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* @plat: Pointer to data for this device - the structure is device-
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* specific but may include the device's I/O address, etc.. This is NULL for
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* devices which use device tree.
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* @ofnode: Devicetree node for this device. This is ofnode_null() for
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* devices which don't use devicetree or don't have a node.
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* @devp: if non-NULL, returns a pointer to the bound device
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* Return: 0 if OK, -ve on error
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*/
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int device_bind(struct udevice *parent, const struct driver *drv,
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const char *name, void *plat, ofnode node,
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struct udevice **devp);
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/**
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* device_bind_with_driver_data() - Create a device and bind it to a driver
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*
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* Called to set up a new device attached to a driver, in the case where the
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* driver was matched to the device by means of a match table that provides
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* driver_data.
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*
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* Once bound a device exists but is not yet active until device_probe() is
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* called.
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*
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* @parent: Pointer to device's parent, under which this driver will exist
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* @drv: Device's driver
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* @name: Name of device (e.g. device tree node name)
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* @driver_data: The driver_data field from the driver's match table.
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* @node: Device tree node for this device. This is invalid for devices which
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* don't use device tree.
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* @devp: if non-NULL, returns a pointer to the bound device
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* Return: 0 if OK, -ve on error
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*/
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int device_bind_with_driver_data(struct udevice *parent,
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const struct driver *drv, const char *name,
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ulong driver_data, ofnode node,
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struct udevice **devp);
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/**
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* device_bind_by_name: Create a device and bind it to a driver
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*
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* This is a helper function used to bind devices which do not use device
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* tree.
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*
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* @parent: Pointer to device's parent
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* @pre_reloc_only: If true, bind the driver only if its DM_FLAG_PRE_RELOC flag
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* is set. If false bind the driver always.
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* @info: Name and plat for this device
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* @devp: if non-NULL, returns a pointer to the bound device
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* Return: 0 if OK, -ve on error
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*/
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int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
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const struct driver_info *info, struct udevice **devp);
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/**
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* device_reparent: reparent the device to a new parent
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*
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* @dev: pointer to device to be reparented
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* @new_parent: pointer to new parent device
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* Return: 0 if OK, -ve on error
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*/
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int device_reparent(struct udevice *dev, struct udevice *new_parent);
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/**
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* device_of_to_plat() - Read platform data for a device
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*
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* Read platform data for a device (typically from the device tree) so that
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* the information needed to probe the device is present.
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*
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* This may cause some others devices to be probed if this one depends on them,
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* e.g. a GPIO line will cause a GPIO device to be probed.
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*
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* All private data associated with the device is allocated.
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*
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* @dev: Pointer to device to process
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* Return: 0 if OK, -ve on error
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*/
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int device_of_to_plat(struct udevice *dev);
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/**
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* device_probe() - Probe a device, activating it
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*
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* Activate a device (if not yet activated) so that it is ready for use.
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* All its parents are probed first.
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*
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* @dev: Pointer to device to probe
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* Return: 0 if OK, -ve on error
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*/
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int device_probe(struct udevice *dev);
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/**
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* device_remove() - Remove a device, de-activating it
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*
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* De-activate a device so that it is no longer ready for use. All its
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* children are deactivated first.
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*
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* @dev: Pointer to device to remove
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* @flags: Flags for selective device removal (DM_REMOVE_...)
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* Return: 0 if OK, -EKEYREJECTED if not removed due to flags, -EPROBE_DEFER if
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* this is a vital device and flags is DM_REMOVE_NON_VITAL, other -ve on
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* error (such an error here is normally a very bad thing)
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*/
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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int device_remove(struct udevice *dev, uint flags);
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#else
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static inline int device_remove(struct udevice *dev, uint flags) { return 0; }
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#endif
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/**
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* device_unbind() - Unbind a device, destroying it
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*
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* Unbind a device and remove all memory used by it
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*
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* @dev: Pointer to device to unbind
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* Return: 0 if OK, -ve on error
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*/
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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int device_unbind(struct udevice *dev);
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#else
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static inline int device_unbind(struct udevice *dev) { return 0; }
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#endif
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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void device_free(struct udevice *dev);
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#else
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static inline void device_free(struct udevice *dev) {}
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#endif
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/**
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* device_chld_unbind() - Unbind all device's children from the device if bound
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* to drv
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*
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* On error, the function continues to unbind all children, and reports the
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* first error.
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*
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* @dev: The device that is to be stripped of its children
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* @drv: The targeted driver
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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 device_chld_unbind(struct udevice *dev, struct driver *drv);
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#else
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static inline int device_chld_unbind(struct udevice *dev, struct driver *drv)
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{
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return 0;
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}
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#endif
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/**
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* device_chld_remove() - Stop all device's children
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*
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* This continues through all children recursively stopping part-way through if
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* an error occurs. Return values of -EKEYREJECTED are ignored and processing
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* continues, since they just indicate that the child did not elect to be
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* removed based on the value of @flags. Return values of -EPROBE_DEFER cause
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* processing of other children to continue, but the function will return
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* -EPROBE_DEFER.
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*
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* @dev: The device whose children are to be removed
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* @drv: The targeted driver
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* @flags: Flag, if this functions is called in the pre-OS stage
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* Return: 0 on success, -EPROBE_DEFER if any child failed to remove, other
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* -ve on error
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*/
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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int device_chld_remove(struct udevice *dev, struct driver *drv,
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uint flags);
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#else
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static inline int device_chld_remove(struct udevice *dev, struct driver *drv,
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uint flags)
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{
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return 0;
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}
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#endif
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/**
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* dev_set_priv() - Set the private data for a device
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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 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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* @dev Device to check
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* @priv New private-data pointer
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*/
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void dev_set_priv(struct udevice *dev, void *priv);
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/**
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* dev_set_parent_priv() - Set the parent-private data for a device
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*
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* This is normally handled by driver model, which automatically allocates
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* parent-private data when an 'auto' size if provided by the 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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* @dev: Device to update
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* @parent_priv: New parent-private data
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*/
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void dev_set_parent_priv(struct udevice *dev, void *parent_priv);
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/**
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* dev_set_uclass_priv() - Set the uclass private data for a device
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*
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* This is normally handled by driver model, which automatically allocates
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* uclass-private data when an 'auto' size if provided by the 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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* @dev: Device to update
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* @uclass_priv: New uclass private data
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*/
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void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv);
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/**
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* dev_set_plat() - Set the platform data for a device
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*
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* This is normally handled by driver model, which automatically allocates
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* platform data when an 'auto' size if provided by the 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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* @dev Device to check
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* @plat New platform-data pointer
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*/
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void dev_set_plat(struct udevice *dev, void *priv);
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/**
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* dev_set_parent_plat() - Set the parent platform data for a device
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*
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* This is normally handled by driver model, which automatically allocates
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* parent platform data when an 'auto' size if provided by the 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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* @dev: Device to update
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* @parent_plat: New parent platform data
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*/
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void dev_set_parent_plat(struct udevice *dev, void *parent_plat);
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/**
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* dev_set_uclass_plat() - Set the uclass platform data for a device
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*
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* This is normally handled by driver model, which automatically allocates
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* uclass platform data when an 'auto' size if provided by the 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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* @dev: Device to update
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* @uclass_plat: New uclass platform data
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*/
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void dev_set_uclass_plat(struct udevice *dev, void *uclass_plat);
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/**
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* simple_bus_translate() - translate a bus address to a system address
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*
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* This handles the 'ranges' property in a simple bus. It translates the
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* device address @addr to a system address using this property.
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*
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* @dev: Simple bus device (parent of target device)
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* @addr: Address to translate
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* Return: new address
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*/
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fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr);
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/* Cast away any volatile pointer */
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#define DM_ROOT_NON_CONST (((gd_t *)gd)->dm_root)
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#define DM_UCLASS_ROOT_NON_CONST (((gd_t *)gd)->uclass_root)
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#define DM_UCLASS_ROOT_S_NON_CONST (((gd_t *)gd)->uclass_root_s)
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/* device resource management */
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#if CONFIG_IS_ENABLED(DEVRES)
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/**
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* devres_release_probe - Release managed resources allocated after probing
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* @dev: Device to release resources for
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*
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* Release all resources allocated for @dev when it was probed or later.
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* This function is called on driver removal.
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*/
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void devres_release_probe(struct udevice *dev);
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/**
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* devres_release_all - Release all managed resources
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* @dev: Device to release resources for
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*
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* Release all resources associated with @dev. This function is
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* called on driver unbinding.
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*/
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void devres_release_all(struct udevice *dev);
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#else /* ! DEVRES */
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static inline void devres_release_probe(struct udevice *dev)
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{
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}
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static inline void devres_release_all(struct udevice *dev)
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{
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}
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#endif /* DEVRES */
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static inline int device_notify(const struct udevice *dev, enum event_t type)
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{
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#if CONFIG_IS_ENABLED(DM_EVENT)
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return event_notify(type, &dev, sizeof(dev));
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#else
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return 0;
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#endif
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}
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#endif
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