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When CONFIG_SPL_STACK_R is enabled, and spl_init() is called before board_init_r(), spl_relocate_stack_gd() will move global_data to a new place in memory. This affects driver model since it uses a list for the uclasses. Unless this is updated the list will become invalid. When looking for a non-existent uclass, such as when adding a new one, the loop in uclass_find() may continue forever, thus causing a hang. Add a function to correct this rather obscure bug. Signed-off-by: Simon Glass <sjg@chromium.org>
119 lines
3.4 KiB
C
119 lines
3.4 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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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _DM_ROOT_H_
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#define _DM_ROOT_H_
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struct udevice;
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/**
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* dm_root() - Return pointer to the top of the driver tree
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*
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* This function returns pointer to the root node of the driver tree,
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*
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* @return pointer to root device, or NULL if not inited yet
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*/
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struct udevice *dm_root(void);
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struct global_data;
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/**
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* dm_fixup_for_gd_move() - Handle global_data moving to a new place
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*
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* The uclass list is part of global_data. Due to the way lists work, moving
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* the list will cause it to become invalid. This function fixes that up so
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* that the uclass list will work correctly.
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*/
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void dm_fixup_for_gd_move(struct global_data *new_gd);
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/**
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* dm_scan_platdata() - Scan all platform data and bind drivers
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*
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* This scans all available platdata and creates drivers for each
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*
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* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
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* flag. If false bind all drivers.
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* @return 0 if OK, -ve on error
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*/
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int dm_scan_platdata(bool pre_reloc_only);
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/**
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* dm_scan_fdt() - Scan the device tree and bind drivers
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*
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* This scans the device tree and creates a driver for each node. Only
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* the top-level subnodes are examined.
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*
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* @blob: Pointer to device tree blob
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* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
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* flag. If false bind all drivers.
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* @return 0 if OK, -ve on error
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*/
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int dm_scan_fdt(const void *blob, bool pre_reloc_only);
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/**
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* dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
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*
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* This scans the subnodes of a device tree node and and creates a driver
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* for each one.
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*
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* @parent: Parent device for the devices that will be created
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* @blob: Pointer to device tree blob
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* @offset: Offset of node to scan
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* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
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* flag. If false bind all drivers.
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* @return 0 if OK, -ve on error
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*/
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int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
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bool pre_reloc_only);
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/**
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* dm_scan_other() - Scan for other devices
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*
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* Some devices may not be visible to Driver Model. This weak function can
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* be provided by boards which wish to create their own devices
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* programmaticaly. They should do this by calling device_bind() on each
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* device.
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*
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* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
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* flag. If false bind all drivers.
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*/
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int dm_scan_other(bool pre_reloc_only);
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/**
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* dm_init_and_scan() - Initialise Driver Model structures and scan for devices
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*
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* This function initialises the roots of the driver tree and uclass trees,
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* then scans and binds available devices from platform data and the FDT.
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* This calls dm_init() to set up Driver Model structures.
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*
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* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
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* flag. If false bind all drivers.
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* @return 0 if OK, -ve on error
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*/
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int dm_init_and_scan(bool pre_reloc_only);
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/**
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* dm_init() - Initialise Driver Model structures
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*
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* This function will initialize roots of driver tree and class tree.
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* This needs to be called before anything uses the DM
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*
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* @return 0 if OK, -ve on error
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*/
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int dm_init(void);
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/**
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* dm_uninit - Uninitialise Driver Model structures
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*
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* All devices will be removed and unbound
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* @return 0 if OK, -ve on error
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*/
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int dm_uninit(void);
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#endif
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