mirror of
https://github.com/AsahiLinux/u-boot
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dd6b68ed4f
In order to support IOMMUs in non-bypass mode we need device ops to map and unmap DMA memory. The map operation enters a mapping for a region specified by CPU address and size into the translation table of the IOMMU and returns a DMA address suitable for programming the device to do DMA. The unmap operation removes this mapping from the translation table of the IOMMU. Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
1082 lines
34 KiB
C
1082 lines
34 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_H
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#define _DM_DEVICE_H
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#include <dm/ofnode.h>
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#include <dm/tag.h>
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#include <dm/uclass-id.h>
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#include <fdtdec.h>
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#include <linker_lists.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/printk.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 plat */
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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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/* DM is responsible for allocating and freeing parent_plat */
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#define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
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/* DM is responsible for allocating and freeing uclass_plat */
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#define DM_FLAG_ALLOC_UCLASS_PDATA (1 << 4)
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/* Allocate driver private data on a DMA boundary */
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#define DM_FLAG_ALLOC_PRIV_DMA (1 << 5)
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/* Device is bound */
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#define DM_FLAG_BOUND (1 << 6)
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/* Device name is allocated and should be freed on unbind() */
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#define DM_FLAG_NAME_ALLOCED (1 << 7)
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/* Device has platform data provided by of-platdata */
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#define DM_FLAG_OF_PLATDATA (1 << 8)
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/*
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* Call driver remove function to stop currently active DMA transfers or
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* give DMA buffers back to the HW / controller. This may be needed for
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* some drivers to do some final stage cleanup before the OS is called
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* (U-Boot exit)
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*/
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#define DM_FLAG_ACTIVE_DMA (1 << 9)
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/*
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* Call driver remove function to do some final configuration, before
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* U-Boot exits and the OS is started
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*/
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#define DM_FLAG_OS_PREPARE (1 << 10)
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/* DM does not enable/disable the power domains corresponding to this device */
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#define DM_FLAG_DEFAULT_PD_CTRL_OFF (1 << 11)
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/* Driver plat has been read. Cleared when the device is removed */
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#define DM_FLAG_PLATDATA_VALID (1 << 12)
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/*
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* Device is removed without switching off its power domain. This might
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* be required, i. e. for serial console (debug) output when booting OS.
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*/
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#define DM_FLAG_LEAVE_PD_ON (1 << 13)
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/*
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* Device is vital to the operation of other devices. It is possible to remove
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* removed this device after all regular devices are removed. This is useful
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* e.g. for clock, which need to be active during the device-removal phase.
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*/
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#define DM_FLAG_VITAL (1 << 14)
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/* Device must be probed after it was bound */
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#define DM_FLAG_PROBE_AFTER_BIND (1 << 15)
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/*
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* One or multiple of these flags are passed to device_remove() so that
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* a selective device removal as specified by the remove-stage and the
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* driver flags can be done.
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*
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* DO NOT use these flags in your driver's @flags value...
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* use the above DM_FLAG_... values instead
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*/
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enum {
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/* Normal remove, remove all devices */
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DM_REMOVE_NORMAL = 1 << 0,
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/* Remove devices with active DMA */
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DM_REMOVE_ACTIVE_DMA = DM_FLAG_ACTIVE_DMA,
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/* Remove devices which need some final OS preparation steps */
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DM_REMOVE_OS_PREPARE = DM_FLAG_OS_PREPARE,
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/* Remove only devices that are not marked vital */
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DM_REMOVE_NON_VITAL = DM_FLAG_VITAL,
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/* Remove devices with any active flag */
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DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA | DM_REMOVE_OS_PREPARE,
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/* Don't power down any attached power domains */
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DM_REMOVE_NO_PD = 1 << 1,
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};
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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_DRVINFO() macro (in which case plat 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 plat in a function
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* implemented by the driver of_to_plat 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 plat, priv and uclass_priv can be allocated by the
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* driver, or you can use the auto 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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* @plat_: Configuration data for this device (do not access outside driver
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* model)
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* @parent_plat_: The parent bus's configuration data for this device (do not
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* access outside driver model)
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* @uclass_plat_: The uclass's configuration data for this device (do not access
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* outside driver model)
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* @driver_data: Driver data word for the entry that matched this device with
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* its driver
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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 (do not access outside driver model)
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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 (do not access
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* outside driver model)
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* @parent_priv_: The parent's private data for this device (do not access
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* outside driver model)
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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_...` (do not access outside driver
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* model)
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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 bound and is unique within the device's uclass. If the
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* device has an alias in the devicetree then that is used to set the sequence
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* number. Otherwise, the next available number is used. Sequence numbers are
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* used by certain commands that need device to be numbered (e.g. 'mmc dev').
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* (do not access outside driver model)
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* @node_: Reference to device tree node for this device (do not access outside
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* driver model)
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* @devres_head: List of memory allocations associated with this device.
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* When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will
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* add to this list. Memory so-allocated will be freed
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* automatically when the device is removed / unbound
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* @dma_offset: Offset between the physical address space (CPU's) and the
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* device's bus address space
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* @iommu: IOMMU device associated with this device
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*/
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struct udevice {
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const struct driver *driver;
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const char *name;
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void *plat_;
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void *parent_plat_;
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void *uclass_plat_;
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ulong driver_data;
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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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#if !CONFIG_IS_ENABLED(OF_PLATDATA_RT)
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u32 flags_;
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#endif
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int seq_;
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#if CONFIG_IS_ENABLED(OF_REAL)
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ofnode node_;
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#endif
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#if CONFIG_IS_ENABLED(DEVRES)
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struct list_head devres_head;
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#endif
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#if CONFIG_IS_ENABLED(DM_DMA)
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ulong dma_offset;
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#endif
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#if CONFIG_IS_ENABLED(IOMMU)
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struct udevice *iommu;
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#endif
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};
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static inline int dm_udevice_size(void)
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{
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if (CONFIG_IS_ENABLED(OF_PLATDATA_RT))
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return ALIGN(sizeof(struct udevice), CONFIG_LINKER_LIST_ALIGN);
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return sizeof(struct udevice);
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}
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/**
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* struct udevice_rt - runtime information set up by U-Boot
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*
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* This is only used with OF_PLATDATA_RT
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*
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* There is one of these for every udevice in the linker list, indexed by
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* the udevice_info idx value.
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*
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* @flags_: Flags for this device `DM_FLAG_...` (do not access outside driver
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* model)
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*/
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struct udevice_rt {
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u32 flags_;
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};
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/* Maximum sequence number supported and associated string length */
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#define DM_MAX_SEQ 999
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#define DM_MAX_SEQ_STR 3
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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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#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
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u32 dev_get_flags(const struct udevice *dev);
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void dev_or_flags(const struct udevice *dev, u32 or);
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void dev_bic_flags(const struct udevice *dev, u32 bic);
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#else
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static inline u32 dev_get_flags(const struct udevice *dev)
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{
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return dev->flags_;
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}
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static inline void dev_or_flags(struct udevice *dev, u32 or)
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{
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dev->flags_ |= or;
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}
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static inline void dev_bic_flags(struct udevice *dev, u32 bic)
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{
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dev->flags_ &= ~bic;
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}
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#endif /* OF_PLATDATA_RT */
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/**
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* dev_ofnode() - get the DT node reference associated with a udevice
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*
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* @dev: device to check
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* Return: reference of the device's DT node
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*/
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static inline __attribute_const__ ofnode dev_ofnode(const struct udevice *dev)
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{
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#if CONFIG_IS_ENABLED(OF_REAL)
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return dev->node_;
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#else
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return ofnode_null();
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#endif
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}
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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_get_flags(dev) & DM_FLAG_ACTIVATED)
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#if CONFIG_IS_ENABLED(DM_DMA)
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#define dev_set_dma_offset(_dev, _offset) _dev->dma_offset = _offset
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#define dev_get_dma_offset(_dev) _dev->dma_offset
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#else
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#define dev_set_dma_offset(_dev, _offset)
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#define dev_get_dma_offset(_dev) 0
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#endif
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static inline __attribute_const__ int dev_of_offset(const struct udevice *dev)
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{
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#if CONFIG_IS_ENABLED(OF_REAL)
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return ofnode_to_offset(dev_ofnode(dev));
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#else
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return -1;
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#endif
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}
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static inline __attribute_const__ bool dev_has_ofnode(const struct udevice *dev)
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{
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#if CONFIG_IS_ENABLED(OF_REAL)
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return ofnode_valid(dev_ofnode(dev));
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#else
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return false;
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#endif
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}
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static inline void dev_set_ofnode(struct udevice *dev, ofnode node)
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{
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#if CONFIG_IS_ENABLED(OF_REAL)
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dev->node_ = node;
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#endif
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}
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static inline int dev_seq(const struct udevice *dev)
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{
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return dev->seq_;
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}
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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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#if CONFIG_IS_ENABLED(OF_REAL)
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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_IS_ENABLED(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 plat 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: Identifies 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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* @of_to_plat: Called before probe to decode device tree data
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* @child_post_bind: Called after a new child has been bound
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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: 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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* @plat_auto: If non-zero this is the size of the
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* platform data to be allocated in the device's ->plat 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 plat will have the data
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* provided in the U_BOOT_DRVINFO() instantiation.
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* @per_child_auto: 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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* @per_child_plat_auto: A bus likes to store information about
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* its children. If non-zero this is the size of this data, to be allocated
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* in the child's parent_plat pointer.
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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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* @acpi_ops: Advanced Configuration and Power Interface (ACPI) operations,
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* allowing the device to add things to the ACPI tables passed to Linux
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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 (*of_to_plat)(struct udevice *dev);
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int (*child_post_bind)(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;
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int plat_auto;
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int per_child_auto;
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int per_child_plat_auto;
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const void *ops; /* driver-specific operations */
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uint32_t flags;
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#if CONFIG_IS_ENABLED(ACPIGEN)
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struct acpi_ops *acpi_ops;
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#endif
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};
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/**
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* U_BOOT_DRIVER() - Declare a new U-Boot driver
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* @__name: name of the driver
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*/
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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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* DM_DRIVER_GET() - Get a pointer to a given driver
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*
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* This is useful in code for referencing a driver at build time.
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* Before this is used, an extern U_BOOT_DRIVER() must have been
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* declared.
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*
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* @__name: Name of the driver. This must be a valid C identifier,
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* used by the linker_list
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* Return: struct driver * for the driver
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*/
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#define DM_DRIVER_GET(__name) \
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ll_entry_get(struct driver, __name, driver)
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/**
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* DM_DRIVER_REF() - Get a reference to a driver
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*
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* This is useful in data structures and code for referencing a driver at
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* build time. Before this is used, an extern U_BOOT_DRIVER() must have been
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* declared.
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* This is like DM_DRIVER_GET, but without the extra code, so it is suitable
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* for putting into data structures.
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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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* struct driver *drvs[] = {
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* DM_DRIVER_REF(sandbox_fixed_clock),
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* };
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*
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* @_name: Name of the driver. This must be a valid C identifier,
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* used by the linker_list
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* Return: struct driver * for the driver
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*/
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#define DM_DRIVER_REF(_name) \
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ll_entry_ref(struct driver, _name, driver)
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/**
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* DM_DRIVER_ALIAS() - Declare a macro to state an alias for a driver name
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*
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* This macro will produce no code but its information will be parsed by tools
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* like dtoc
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*
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* @__name: name of driver
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* @__alias: alias for the driver name
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*/
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#define DM_DRIVER_ALIAS(__name, __alias)
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/**
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* DM_PHASE() - Declare a macro to indicate which phase of U-Boot this driver is for.
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*
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* This macro produces no code but its information will be parsed by dtoc. The
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* macro can be only be used once in a driver. Put it within the U_BOOT_DRIVER()
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* declaration, e.g.::
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*
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* U_BOOT_DRIVER(cpu) = {
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* .name = ...
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* ...
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* DM_PHASE(tpl)
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* };
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*
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* @_phase: Associated phase of U-Boot ("spl", "tpl")
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*/
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#define DM_PHASE(_phase)
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/**
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* DM_HEADER() - Declare a macro to declare a header needed for a driver.
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*
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* Often the correct header can be found automatically, but only for struct
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* declarations. For enums and #defines used in the driver declaration and
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* declared in a different header from the structs, this macro must be used.
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*
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* This macro produces no code but its information will be parsed by dtoc. The
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* macro can be used multiple times with different headers, for the same driver.
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* Put it within the U_BOOT_DRIVER() declaration, e.g.::
|
|
*
|
|
* U_BOOT_DRIVER(cpu) = {
|
|
* .name = ...
|
|
* ...
|
|
* DM_HEADER(<asm/cpu.h>)
|
|
* };
|
|
*
|
|
* @_hdr: header needed for a driver
|
|
*/
|
|
#define DM_HEADER(_hdr)
|
|
|
|
/**
|
|
* dev_get_plat() - Get the platform data for a device
|
|
*
|
|
* This checks that dev is not NULL, but no other checks for now
|
|
*
|
|
* @dev: Device to check
|
|
* Return: platform data, or NULL if none
|
|
*/
|
|
void *dev_get_plat(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_parent_plat() - Get the parent platform data for a device
|
|
*
|
|
* This checks that dev is not NULL, but no other checks for now
|
|
*
|
|
* @dev: Device to check
|
|
* Return: parent's platform data, or NULL if none
|
|
*/
|
|
void *dev_get_parent_plat(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_uclass_plat() - Get the uclass platform data for a device
|
|
*
|
|
* This checks that dev is not NULL, but no other checks for now
|
|
*
|
|
* @dev: Device to check
|
|
* Return: uclass's platform data, or NULL if none
|
|
*/
|
|
void *dev_get_uclass_plat(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_priv() - Get the private data for a device
|
|
*
|
|
* This checks that dev is not NULL, but no other checks for now
|
|
*
|
|
* @dev: Device to check
|
|
* Return: private data, or NULL if none
|
|
*/
|
|
void *dev_get_priv(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_parent_priv() - Get the parent private data for a device
|
|
*
|
|
* The parent private data is data stored in the device but owned by the
|
|
* parent. For example, a USB device may have parent data which contains
|
|
* information about how to talk to the device over USB.
|
|
*
|
|
* This checks that dev is not NULL, but no other checks for now
|
|
*
|
|
* @dev: Device to check
|
|
* Return: parent data, or NULL if none
|
|
*/
|
|
void *dev_get_parent_priv(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_uclass_priv() - Get the private uclass data for a device
|
|
*
|
|
* This checks that dev is not NULL, but no other checks for now
|
|
*
|
|
* @dev: Device to check
|
|
* Return: private uclass data for this device, or NULL if none
|
|
*/
|
|
void *dev_get_uclass_priv(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_attach_ptr() - Get the value of an attached pointed tag
|
|
*
|
|
* The tag is assumed to hold a pointer, if it exists
|
|
*
|
|
* @dev: Device to look at
|
|
* @tag: Tag to access
|
|
* @return value of tag, or NULL if there is no tag of this type
|
|
*/
|
|
void *dev_get_attach_ptr(const struct udevice *dev, enum dm_tag_t tag);
|
|
|
|
/**
|
|
* dev_get_attach_size() - Get the size of an attached tag
|
|
*
|
|
* Core tags have an automatic-allocation mechanism where the allocated size is
|
|
* defined by the device, parent or uclass. This returns the size associated
|
|
* with a particular tag
|
|
*
|
|
* @dev: Device to look at
|
|
* @tag: Tag to access
|
|
* @return size of auto-allocated data, 0 if none
|
|
*/
|
|
int dev_get_attach_size(const struct udevice *dev, enum dm_tag_t tag);
|
|
|
|
/**
|
|
* dev_get_parent() - Get the parent of a device
|
|
*
|
|
* @child: Child to check
|
|
* Return: parent of child, or NULL if this is the root device
|
|
*/
|
|
struct udevice *dev_get_parent(const struct udevice *child);
|
|
|
|
/**
|
|
* dev_get_driver_data() - get the driver data used to bind a device
|
|
*
|
|
* When a device is bound using a device tree node, it matches a
|
|
* particular compatible string in struct udevice_id. This function
|
|
* returns the associated data value for that compatible string. This is
|
|
* the 'data' field in struct udevice_id.
|
|
*
|
|
* As an example, consider this structure::
|
|
*
|
|
* static const struct udevice_id tegra_i2c_ids[] = {
|
|
* { .compatible = "nvidia,tegra114-i2c", .data = TYPE_114 },
|
|
* { .compatible = "nvidia,tegra20-i2c", .data = TYPE_STD },
|
|
* { .compatible = "nvidia,tegra20-i2c-dvc", .data = TYPE_DVC },
|
|
* { }
|
|
* };
|
|
*
|
|
* When driver model finds a driver for this it will store the 'data' value
|
|
* corresponding to the compatible string it matches. This function returns
|
|
* that value. This allows the driver to handle several variants of a device.
|
|
*
|
|
* For USB devices, this is the driver_info field in struct usb_device_id.
|
|
*
|
|
* @dev: Device to check
|
|
* Return: driver data (0 if none is provided)
|
|
*/
|
|
ulong dev_get_driver_data(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_driver_ops() - get the device's driver's operations
|
|
*
|
|
* This checks that dev is not NULL, and returns the pointer to device's
|
|
* driver's operations.
|
|
*
|
|
* @dev: Device to check
|
|
* Return: void pointer to driver's operations or NULL for NULL-dev or NULL-ops
|
|
*/
|
|
const void *dev_get_driver_ops(const struct udevice *dev);
|
|
|
|
/**
|
|
* device_get_uclass_id() - return the uclass ID of a device
|
|
*
|
|
* @dev: Device to check
|
|
* Return: uclass ID for the device
|
|
*/
|
|
enum uclass_id device_get_uclass_id(const struct udevice *dev);
|
|
|
|
/**
|
|
* dev_get_uclass_name() - return the uclass name of a device
|
|
*
|
|
* This checks that dev is not NULL.
|
|
*
|
|
* @dev: Device to check
|
|
* Return: pointer to the uclass name for the device
|
|
*/
|
|
const char *dev_get_uclass_name(const struct udevice *dev);
|
|
|
|
/**
|
|
* device_get_child() - Get the child of a device by index
|
|
*
|
|
* Returns the numbered child, 0 being the first. This does not use
|
|
* sequence numbers, only the natural order.
|
|
*
|
|
* @parent: Parent device to check
|
|
* @index: Child index
|
|
* @devp: Returns pointer to device
|
|
* Return:
|
|
* 0 if OK, -ENODEV if no such device, other error if the device fails to probe
|
|
*/
|
|
int device_get_child(const struct udevice *parent, int index,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_get_child_count() - Get the child count of a device
|
|
*
|
|
* Returns the number of children to a device.
|
|
*
|
|
* @parent: Parent device to check
|
|
*/
|
|
int device_get_child_count(const struct udevice *parent);
|
|
|
|
/**
|
|
* device_get_decendent_count() - Get the total number of decendents of a device
|
|
*
|
|
* Returns the total number of decendents, including all children
|
|
*
|
|
* @parent: Parent device to check
|
|
*/
|
|
int device_get_decendent_count(const struct udevice *parent);
|
|
|
|
/**
|
|
* device_find_child_by_seq() - Find a child device based on a sequence
|
|
*
|
|
* This searches for a device with the given seq.
|
|
*
|
|
* @parent: Parent device
|
|
* @seq: Sequence number to find (0=first)
|
|
* @devp: Returns pointer to device (there is only one per for each seq).
|
|
* Set to NULL if none is found
|
|
* Return: 0 if OK, -ENODEV if not found
|
|
*/
|
|
int device_find_child_by_seq(const struct udevice *parent, int seq,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_get_child_by_seq() - Get a child device based on a sequence
|
|
*
|
|
* If an active device has this sequence it will be returned. If there is no
|
|
* such device then this will check for a device that is requesting this
|
|
* sequence.
|
|
*
|
|
* The device is probed to activate it ready for use.
|
|
*
|
|
* @parent: Parent device
|
|
* @seq: Sequence number to find (0=first)
|
|
* @devp: Returns pointer to device (there is only one per for each seq)
|
|
* Set to NULL if none is found
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int device_get_child_by_seq(const struct udevice *parent, int seq,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_child_by_of_offset() - Find a child device based on FDT offset
|
|
*
|
|
* Locates a child device by its device tree offset.
|
|
*
|
|
* @parent: Parent device
|
|
* @of_offset: Device tree offset to find
|
|
* @devp: Returns pointer to device if found, otherwise this is set to NULL
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int device_find_child_by_of_offset(const struct udevice *parent, int of_offset,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_get_child_by_of_offset() - Get a child device based on FDT offset
|
|
*
|
|
* Locates a child device by its device tree offset.
|
|
*
|
|
* The device is probed to activate it ready for use.
|
|
*
|
|
* @parent: Parent device
|
|
* @of_offset: Device tree offset to find
|
|
* @devp: Returns pointer to device if found, otherwise this is set to NULL
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int device_get_child_by_of_offset(const struct udevice *parent, int of_offset,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_global_by_ofnode() - Get a device based on ofnode
|
|
*
|
|
* Locates a device by its device tree ofnode, searching globally throughout
|
|
* the all driver model devices.
|
|
*
|
|
* The device is NOT probed
|
|
*
|
|
* @node: Device tree ofnode to find
|
|
* @devp: Returns pointer to device if found, otherwise this is set to NULL
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
|
|
int device_find_global_by_ofnode(ofnode node, struct udevice **devp);
|
|
|
|
/**
|
|
* device_get_global_by_ofnode() - Get a device based on ofnode
|
|
*
|
|
* Locates a device by its device tree ofnode, searching globally throughout
|
|
* the all driver model devices.
|
|
*
|
|
* The device is probed to activate it ready for use.
|
|
*
|
|
* @node: Device tree ofnode to find
|
|
* @devp: Returns pointer to device if found, otherwise this is set to NULL
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int device_get_global_by_ofnode(ofnode node, struct udevice **devp);
|
|
|
|
/**
|
|
* device_get_by_ofplat_idx() - Get a device based on of-platdata index
|
|
*
|
|
* Locates a device by either its struct driver_info index, or its
|
|
* struct udevice index. The latter is used with OF_PLATDATA_INST, since we have
|
|
* a list of build-time instantiated struct udevice records, The former is used
|
|
* with !OF_PLATDATA_INST since in that case we have a list of
|
|
* struct driver_info records.
|
|
*
|
|
* The index number is written into the idx field of struct phandle_1_arg, etc.
|
|
* It is the position of this driver_info/udevice in its linker list.
|
|
*
|
|
* The device is probed to activate it ready for use.
|
|
*
|
|
* @idx: Index number of the driver_info/udevice structure (0=first)
|
|
* @devp: Returns pointer to device if found, otherwise this is set to NULL
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int device_get_by_ofplat_idx(uint idx, struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_first_child() - Find the first child of a device
|
|
*
|
|
* @parent: Parent device to search
|
|
* @devp: Returns first child device, or NULL if none
|
|
* Return: 0
|
|
*/
|
|
int device_find_first_child(const struct udevice *parent,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_next_child() - Find the next child of a device
|
|
*
|
|
* @devp: Pointer to previous child device on entry. Returns pointer to next
|
|
* child device, or NULL if none
|
|
* Return: 0
|
|
*/
|
|
int device_find_next_child(struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_first_inactive_child() - Find the first inactive child
|
|
*
|
|
* This is used to locate an existing child of a device which is of a given
|
|
* uclass.
|
|
*
|
|
* The device is NOT probed
|
|
*
|
|
* @parent: Parent device to search
|
|
* @uclass_id: Uclass to look for
|
|
* @devp: Returns device found, if any, else NULL
|
|
* Return: 0 if found, else -ENODEV
|
|
*/
|
|
int device_find_first_inactive_child(const struct udevice *parent,
|
|
enum uclass_id uclass_id,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_first_child_by_uclass() - Find the first child of a device in uc
|
|
*
|
|
* @parent: Parent device to search
|
|
* @uclass_id: Uclass to look for
|
|
* @devp: Returns first child device in that uclass, if any, else NULL
|
|
* Return: 0 if found, else -ENODEV
|
|
*/
|
|
int device_find_first_child_by_uclass(const struct udevice *parent,
|
|
enum uclass_id uclass_id,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_child_by_namelen() - Find a child by device name
|
|
*
|
|
* @parent: Parent device to search
|
|
* @name: Name to look for
|
|
* @len: Length of the name
|
|
* @devp: Returns device found, if any
|
|
* Return: 0 if found, else -ENODEV
|
|
*/
|
|
int device_find_child_by_namelen(const struct udevice *parent, const char *name,
|
|
int len, struct udevice **devp);
|
|
|
|
/**
|
|
* device_find_child_by_name() - Find a child by device name
|
|
*
|
|
* @parent: Parent device to search
|
|
* @name: Name to look for
|
|
* @devp: Returns device found, if any
|
|
* Return: 0 if found, else -ENODEV
|
|
*/
|
|
int device_find_child_by_name(const struct udevice *parent, const char *name,
|
|
struct udevice **devp);
|
|
|
|
/**
|
|
* device_first_child_ofdata_err() - Find the first child and reads its plat
|
|
*
|
|
* The of_to_plat() method is called on the child before it is returned,
|
|
* but the child is not probed.
|
|
*
|
|
* @parent: Parent to check
|
|
* @devp: Returns child that was found, if any
|
|
* Return: 0 on success, -ENODEV if no children, other -ve on error
|
|
*/
|
|
int device_first_child_ofdata_err(struct udevice *parent,
|
|
struct udevice **devp);
|
|
|
|
/*
|
|
* device_next_child_ofdata_err() - Find the next child and read its plat
|
|
*
|
|
* The of_to_plat() method is called on the child before it is returned,
|
|
* but the child is not probed.
|
|
*
|
|
* @devp: On entry, points to the previous child; on exit returns the child that
|
|
* was found, if any
|
|
* Return: 0 on success, -ENODEV if no children, other -ve on error
|
|
*/
|
|
int device_next_child_ofdata_err(struct udevice **devp);
|
|
|
|
/**
|
|
* device_first_child_err() - Get the first child of a device
|
|
*
|
|
* The device returned is probed if necessary, and ready for use
|
|
*
|
|
* @parent: Parent device to search
|
|
* @devp: Returns device found, if any
|
|
* Return: 0 if found, -ENODEV if not, -ve error if device failed to probe
|
|
*/
|
|
int device_first_child_err(struct udevice *parent, struct udevice **devp);
|
|
|
|
/**
|
|
* device_next_child_err() - Get the next child of a parent device
|
|
*
|
|
* The device returned is probed if necessary, and ready for use
|
|
*
|
|
* @devp: On entry, pointer to device to lookup. On exit, returns pointer
|
|
* to the next sibling if no error occurred
|
|
* Return: 0 if found, -ENODEV if not, -ve error if device failed to probe
|
|
*/
|
|
int device_next_child_err(struct udevice **devp);
|
|
|
|
/**
|
|
* device_has_children() - check if a device has any children
|
|
*
|
|
* @dev: Device to check
|
|
* Return: true if the device has one or more children
|
|
*/
|
|
bool device_has_children(const struct udevice *dev);
|
|
|
|
/**
|
|
* device_has_active_children() - check if a device has any active children
|
|
*
|
|
* @dev: Device to check
|
|
* Return: true if the device has one or more children and at least one of
|
|
* them is active (probed).
|
|
*/
|
|
bool device_has_active_children(const struct udevice *dev);
|
|
|
|
/**
|
|
* device_is_last_sibling() - check if a device is the last sibling
|
|
*
|
|
* This function can be useful for display purposes, when special action needs
|
|
* to be taken when displaying the last sibling. This can happen when a tree
|
|
* view of devices is being displayed.
|
|
*
|
|
* @dev: Device to check
|
|
* Return: true if there are no more siblings after this one - i.e. is it
|
|
* last in the list.
|
|
*/
|
|
bool device_is_last_sibling(const struct udevice *dev);
|
|
|
|
/**
|
|
* device_set_name() - set the name of a device
|
|
*
|
|
* This must be called in the device's bind() method and no later. Normally
|
|
* this is unnecessary but for probed devices which don't get a useful name
|
|
* this function can be helpful.
|
|
*
|
|
* The name is allocated and will be freed automatically when the device is
|
|
* unbound.
|
|
*
|
|
* @dev: Device to update
|
|
* @name: New name (this string is allocated new memory and attached to
|
|
* the device)
|
|
* Return: 0 if OK, -ENOMEM if there is not enough memory to allocate the
|
|
* string
|
|
*/
|
|
int device_set_name(struct udevice *dev, const char *name);
|
|
|
|
/**
|
|
* device_set_name_alloced() - note that a device name is allocated
|
|
*
|
|
* This sets the DM_FLAG_NAME_ALLOCED flag for the device, so that when it is
|
|
* unbound the name will be freed. This avoids memory leaks.
|
|
*
|
|
* @dev: Device to update
|
|
*/
|
|
void device_set_name_alloced(struct udevice *dev);
|
|
|
|
/**
|
|
* device_is_compatible() - check if the device is compatible with the compat
|
|
*
|
|
* This allows to check whether the device is comaptible with the compat.
|
|
*
|
|
* @dev: udevice pointer for which compatible needs to be verified.
|
|
* @compat: Compatible string which needs to verified in the given
|
|
* device
|
|
* Return: true if OK, false if the compatible is not found
|
|
*/
|
|
bool device_is_compatible(const struct udevice *dev, const char *compat);
|
|
|
|
/**
|
|
* of_machine_is_compatible() - check if the machine is compatible with
|
|
* the compat
|
|
*
|
|
* This allows to check whether the machine is comaptible with the compat.
|
|
*
|
|
* @compat: Compatible string which needs to verified
|
|
* Return: true if OK, false if the compatible is not found
|
|
*/
|
|
bool of_machine_is_compatible(const char *compat);
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|
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/**
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* dev_disable_by_path() - Disable a device given its device tree path
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*
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|
* @path: The device tree path identifying the device to be disabled
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|
* Return: 0 on success, -ve on error
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|
*/
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int dev_disable_by_path(const char *path);
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|
|
|
/**
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|
* dev_enable_by_path() - Enable a device given its device tree path
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|
*
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|
* @path: The device tree path identifying the device to be enabled
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|
* Return: 0 on success, -ve on error
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|
*/
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|
int dev_enable_by_path(const char *path);
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|
|
|
/**
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|
* device_is_on_pci_bus - Test if a device is on a PCI bus
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|
*
|
|
* @dev: device to test
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|
* Return: true if it is on a PCI bus, false otherwise
|
|
*/
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|
static inline bool device_is_on_pci_bus(const struct udevice *dev)
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|
{
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|
return dev->parent && device_get_uclass_id(dev->parent) == UCLASS_PCI;
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}
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|
|
/**
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|
* device_foreach_child_safe() - iterate through child devices safely
|
|
*
|
|
* This allows the @pos child to be removed in the loop if required.
|
|
*
|
|
* @pos: struct udevice * for the current device
|
|
* @next: struct udevice * for the next device
|
|
* @parent: parent device to scan
|
|
*/
|
|
#define device_foreach_child_safe(pos, next, parent) \
|
|
list_for_each_entry_safe(pos, next, &parent->child_head, sibling_node)
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|
|
|
/**
|
|
* device_foreach_child() - iterate through child devices
|
|
*
|
|
* @pos: struct udevice * for the current device
|
|
* @parent: parent device to scan
|
|
*/
|
|
#define device_foreach_child(pos, parent) \
|
|
list_for_each_entry(pos, &parent->child_head, sibling_node)
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|
|
|
/**
|
|
* device_foreach_child_of_to_plat() - iterate through children
|
|
*
|
|
* This stops when it gets an error, with @pos set to the device that failed to
|
|
* read ofdata.
|
|
*
|
|
* This creates a for() loop which works through the available children of
|
|
* a device in order from start to end. Device ofdata is read by calling
|
|
* device_of_to_plat() on each one. The devices are not probed.
|
|
*
|
|
* @pos: struct udevice * for the current device
|
|
* @parent: parent device to scan
|
|
*/
|
|
#define device_foreach_child_of_to_plat(pos, parent) \
|
|
for (int _ret = device_first_child_ofdata_err(parent, &pos); !_ret; \
|
|
_ret = device_next_child_ofdata_err(&pos))
|
|
|
|
/**
|
|
* device_foreach_child_probe() - iterate through children, probing them
|
|
*
|
|
* This creates a for() loop which works through the available children of
|
|
* a device in order from start to end. Devices are probed if necessary,
|
|
* and ready for use.
|
|
*
|
|
* This stops when it gets an error, with @pos set to the device that failed to
|
|
* probe
|
|
*
|
|
* @pos: struct udevice * for the current device
|
|
* @parent: parent device to scan
|
|
*/
|
|
#define device_foreach_child_probe(pos, parent) \
|
|
for (int _ret = device_first_child_err(parent, &pos); !_ret; \
|
|
_ret = device_next_child_err(&pos))
|
|
|
|
/**
|
|
* dm_scan_fdt_dev() - Bind child device in the device tree
|
|
*
|
|
* This handles device which have sub-nodes in the device tree. It scans all
|
|
* sub-nodes and binds drivers for each node where a driver can be found.
|
|
*
|
|
* If this is called prior to relocation, only pre-relocation devices will be
|
|
* bound (those marked with u-boot,dm-pre-reloc in the device tree, or where
|
|
* the driver has the DM_FLAG_PRE_RELOC flag set). Otherwise, all devices will
|
|
* be bound.
|
|
*
|
|
* @dev: Device to scan
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int dm_scan_fdt_dev(struct udevice *dev);
|
|
|
|
#endif
|