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bcd90cb692
Add a new internal function, device_ofdata_to_platdata() to handle allocating private space associated with each device and reading the platform data from the device tree. Call this new function from device_probe(). Signed-off-by: Simon Glass <sjg@chromium.org>
236 lines
7.1 KiB
C
236 lines
7.1 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 <dm/ofnode.h>
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struct device_node;
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struct 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 platdata, or a device tree node which can be used to create the
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* platdata.
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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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* @platdata: 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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* @of_offset: Offset of device tree node for this device. This is -1 for
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* devices which 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(struct udevice *parent, const struct driver *drv,
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const char *name, void *platdata, int of_offset,
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struct udevice **devp);
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int device_bind_ofnode(struct udevice *parent, const struct driver *drv,
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const char *name, void *platdata, 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 platdata 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_ofdata_to_platdata() - 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_ofdata_to_platdata(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 so that it is ready for use. All its parents are probed
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* 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, -ve on error (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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* @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, -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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* 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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/* device resource management */
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#ifdef CONFIG_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 /* ! CONFIG_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 /* ! CONFIG_DEVRES */
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#endif
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