u-boot/include/dm/device-internal.h
Michal Suchanek aa5511e77b dm: core: Add note about device_probe idempotence
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>
2022-10-29 07:36:33 -06:00

440 lines
14 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
* Marek Vasut <marex@denx.de>
*/
#ifndef _DM_DEVICE_INTERNAL_H
#define _DM_DEVICE_INTERNAL_H
#include <event.h>
#include <linker_lists.h>
#include <dm/ofnode.h>
struct device_node;
struct driver_info;
struct udevice;
/*
* These two macros DM_DEVICE_INST and DM_DEVICE_REF are only allowed in code
* generated by dtoc, because the ordering is important and if other instances
* creep in then they may mess up the ordering expected by dtoc.
*
* It is OK to use them with 'extern' though, since that does not actually
* add a new record to the linker_list.
*/
/**
* DM_DEVICE_INST() - Declare a bound device ready for run-time use
*
* This adds an actual struct udevice to a list which is found by driver model
* on start-up.
*
* For example:
*
* extern U_BOOT_DRIVER(sandbox_fixed_clock);
* extern DM_UCLASS_INST(clk);
*
* DM_DEVICE_INST(clk_fixed) = {
* .driver = DM_DRIVER_REF(sandbox_fixed_clock),
* .name = "sandbox_fixed_clock",
* .plat_ = &_sandbox_fixed_clock_plat_clk_fixed,
* .uclass = DM_UCLASS_REF(clk),
* ...
* .seq_ = 0,
* };
*
* @_name: Name of the udevice. This must be a valid C identifier, used by the
* linker_list.
*/
#define DM_DEVICE_INST(_name) \
ll_entry_declare(struct udevice, _name, udevice)
/**
* DM_DEVICE_REF() - Get a reference to a device
*
* This is useful in data structures and code for referencing a udevice at
* build time. Before this is used, an extern DM_DEVICE_INST() must have been
* declared.
*
* For example:
*
* extern DM_DEVICE_INST(clk_fixed);
*
* struct udevice *devs[] = {
* DM_DEVICE_REF(clk_fixed),
* };
*
* @_name: Name of the udevice. This must be a valid C identifier, used by the
* linker_list
* @returns struct udevice * for the device
*/
#define DM_DEVICE_REF(_name) \
ll_entry_ref(struct udevice, _name, udevice)
/**
* DM_DEVICE_GET() - Get a pointer to a given device
*
* This is similar to DM_DEVICE_REF() except that it does not need the extern
* declaration before it. However it cannot be used in a data structures, only
* in code within a function.
*
* For example:
*
* void some_function() {
* struct udevice *dev = DM_DEVICE_GET(clk_fixed);
* ...
* }
*/
#define DM_DEVICE_GET(__name) \
ll_entry_get(struct udevice, __name, udevice)
/**
* device_bind() - Create a device and bind it to a driver
*
* Called to set up a new device attached to a driver. The device will either
* have plat, or a device tree node which can be used to create the
* plat.
*
* Once bound a device exists but is not yet active until device_probe() is
* called.
*
* @parent: Pointer to device's parent, under which this driver will exist
* @drv: Device's driver
* @name: Name of device (e.g. device tree node name)
* @plat: Pointer to data for this device - the structure is device-
* specific but may include the device's I/O address, etc.. This is NULL for
* devices which use device tree.
* @ofnode: Devicetree node for this device. This is ofnode_null() for
* devices which don't use devicetree or don't have a node.
* @devp: if non-NULL, returns a pointer to the bound device
* Return: 0 if OK, -ve on error
*/
int device_bind(struct udevice *parent, const struct driver *drv,
const char *name, void *plat, ofnode node,
struct udevice **devp);
/**
* device_bind_with_driver_data() - Create a device and bind it to a driver
*
* Called to set up a new device attached to a driver, in the case where the
* driver was matched to the device by means of a match table that provides
* driver_data.
*
* Once bound a device exists but is not yet active until device_probe() is
* called.
*
* @parent: Pointer to device's parent, under which this driver will exist
* @drv: Device's driver
* @name: Name of device (e.g. device tree node name)
* @driver_data: The driver_data field from the driver's match table.
* @node: Device tree node for this device. This is invalid for devices which
* don't use device tree.
* @devp: if non-NULL, returns a pointer to the bound device
* Return: 0 if OK, -ve on error
*/
int device_bind_with_driver_data(struct udevice *parent,
const struct driver *drv, const char *name,
ulong driver_data, ofnode node,
struct udevice **devp);
/**
* device_bind_by_name: Create a device and bind it to a driver
*
* This is a helper function used to bind devices which do not use device
* tree.
*
* @parent: Pointer to device's parent
* @pre_reloc_only: If true, bind the driver only if its DM_FLAG_PRE_RELOC flag
* is set. If false bind the driver always.
* @info: Name and plat for this device
* @devp: if non-NULL, returns a pointer to the bound device
* Return: 0 if OK, -ve on error
*/
int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
const struct driver_info *info, struct udevice **devp);
/**
* device_reparent: reparent the device to a new parent
*
* @dev: pointer to device to be reparented
* @new_parent: pointer to new parent device
* Return: 0 if OK, -ve on error
*/
int device_reparent(struct udevice *dev, struct udevice *new_parent);
/**
* device_of_to_plat() - Read platform data for a device
*
* Read platform data for a device (typically from the device tree) so that
* the information needed to probe the device is present.
*
* This may cause some others devices to be probed if this one depends on them,
* e.g. a GPIO line will cause a GPIO device to be probed.
*
* All private data associated with the device is allocated.
*
* @dev: Pointer to device to process
* Return: 0 if OK, -ve on error
*/
int device_of_to_plat(struct udevice *dev);
/**
* device_probe() - Probe a device, activating it
*
* Activate a device (if not yet activated) so that it is ready for use.
* All its parents are probed first.
*
* @dev: Pointer to device to probe
* Return: 0 if OK, -ve on error
*/
int device_probe(struct udevice *dev);
/**
* device_remove() - Remove a device, de-activating it
*
* De-activate a device so that it is no longer ready for use. All its
* children are deactivated first.
*
* @dev: Pointer to device to remove
* @flags: Flags for selective device removal (DM_REMOVE_...)
* Return: 0 if OK, -EKEYREJECTED if not removed due to flags, -EPROBE_DEFER if
* this is a vital device and flags is DM_REMOVE_NON_VITAL, other -ve on
* error (such an error here is normally a very bad thing)
*/
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
int device_remove(struct udevice *dev, uint flags);
#else
static inline int device_remove(struct udevice *dev, uint flags) { return 0; }
#endif
/**
* device_unbind() - Unbind a device, destroying it
*
* Unbind a device and remove all memory used by it
*
* @dev: Pointer to device to unbind
* Return: 0 if OK, -ve on error
*/
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
int device_unbind(struct udevice *dev);
#else
static inline int device_unbind(struct udevice *dev) { return 0; }
#endif
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
void device_free(struct udevice *dev);
#else
static inline void device_free(struct udevice *dev) {}
#endif
/**
* device_chld_unbind() - Unbind all device's children from the device if bound
* to drv
*
* On error, the function continues to unbind all children, and reports the
* first error.
*
* @dev: The device that is to be stripped of its children
* @drv: The targeted driver
* Return: 0 on success, -ve on error
*/
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
int device_chld_unbind(struct udevice *dev, struct driver *drv);
#else
static inline int device_chld_unbind(struct udevice *dev, struct driver *drv)
{
return 0;
}
#endif
/**
* device_chld_remove() - Stop all device's children
*
* This continues through all children recursively stopping part-way through if
* an error occurs. Return values of -EKEYREJECTED are ignored and processing
* continues, since they just indicate that the child did not elect to be
* removed based on the value of @flags. Return values of -EPROBE_DEFER cause
* processing of other children to continue, but the function will return
* -EPROBE_DEFER.
*
* @dev: The device whose children are to be removed
* @drv: The targeted driver
* @flags: Flag, if this functions is called in the pre-OS stage
* Return: 0 on success, -EPROBE_DEFER if any child failed to remove, other
* -ve on error
*/
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
int device_chld_remove(struct udevice *dev, struct driver *drv,
uint flags);
#else
static inline int device_chld_remove(struct udevice *dev, struct driver *drv,
uint flags)
{
return 0;
}
#endif
/**
* dev_set_priv() - Set the private data for a device
*
* This is normally handled by driver model, which automatically allocates
* private data when an 'auto' size if provided by the driver.
*
* Use this function to override normal operation for special situations, such
* as needing to allocate a variable amount of data.
*
* If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
* model code, since the pointer must be within the gd->dm_priv_base region.
*
* @dev Device to check
* @priv New private-data pointer
*/
void dev_set_priv(struct udevice *dev, void *priv);
/**
* dev_set_parent_priv() - Set the parent-private data for a device
*
* This is normally handled by driver model, which automatically allocates
* parent-private data when an 'auto' size if provided by the driver.
*
* Use this function to override normal operation for special situations, such
* as needing to allocate a variable amount of data.
*
* If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
* model code, since the pointer must be within the gd->dm_priv_base region.
*
* @dev: Device to update
* @parent_priv: New parent-private data
*/
void dev_set_parent_priv(struct udevice *dev, void *parent_priv);
/**
* dev_set_uclass_priv() - Set the uclass private data for a device
*
* This is normally handled by driver model, which automatically allocates
* uclass-private data when an 'auto' size if provided by the driver.
*
* Use this function to override normal operation for special situations, such
* as needing to allocate a variable amount of data.
*
* If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
* model code, since the pointer must be within the gd->dm_priv_base region.
*
* @dev: Device to update
* @uclass_priv: New uclass private data
*/
void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv);
/**
* dev_set_plat() - Set the platform data for a device
*
* This is normally handled by driver model, which automatically allocates
* platform data when an 'auto' size if provided by the driver.
*
* Use this function to override normal operation for special situations, such
* as needing to allocate a variable amount of data.
*
* If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
* model code, since the pointer must be within the gd->dm_priv_base region.
*
* @dev Device to check
* @plat New platform-data pointer
*/
void dev_set_plat(struct udevice *dev, void *priv);
/**
* dev_set_parent_plat() - Set the parent platform data for a device
*
* This is normally handled by driver model, which automatically allocates
* parent platform data when an 'auto' size if provided by the driver.
*
* Use this function to override normal operation for special situations, such
* as needing to allocate a variable amount of data.
*
* If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
* model code, since the pointer must be within the gd->dm_priv_base region.
*
* @dev: Device to update
* @parent_plat: New parent platform data
*/
void dev_set_parent_plat(struct udevice *dev, void *parent_plat);
/**
* dev_set_uclass_plat() - Set the uclass platform data for a device
*
* This is normally handled by driver model, which automatically allocates
* uclass platform data when an 'auto' size if provided by the driver.
*
* Use this function to override normal operation for special situations, such
* as needing to allocate a variable amount of data.
*
* If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
* model code, since the pointer must be within the gd->dm_priv_base region.
*
* @dev: Device to update
* @uclass_plat: New uclass platform data
*/
void dev_set_uclass_plat(struct udevice *dev, void *uclass_plat);
/**
* simple_bus_translate() - translate a bus address to a system address
*
* This handles the 'ranges' property in a simple bus. It translates the
* device address @addr to a system address using this property.
*
* @dev: Simple bus device (parent of target device)
* @addr: Address to translate
* Return: new address
*/
fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr);
/* Cast away any volatile pointer */
#define DM_ROOT_NON_CONST (((gd_t *)gd)->dm_root)
#define DM_UCLASS_ROOT_NON_CONST (((gd_t *)gd)->uclass_root)
#define DM_UCLASS_ROOT_S_NON_CONST (((gd_t *)gd)->uclass_root_s)
/* device resource management */
#if CONFIG_IS_ENABLED(DEVRES)
/**
* devres_release_probe - Release managed resources allocated after probing
* @dev: Device to release resources for
*
* Release all resources allocated for @dev when it was probed or later.
* This function is called on driver removal.
*/
void devres_release_probe(struct udevice *dev);
/**
* devres_release_all - Release all managed resources
* @dev: Device to release resources for
*
* Release all resources associated with @dev. This function is
* called on driver unbinding.
*/
void devres_release_all(struct udevice *dev);
#else /* ! DEVRES */
static inline void devres_release_probe(struct udevice *dev)
{
}
static inline void devres_release_all(struct udevice *dev)
{
}
#endif /* DEVRES */
static inline int device_notify(const struct udevice *dev, enum event_t type)
{
#if CONFIG_IS_ENABLED(DM_EVENT)
return event_notify(type, &dev, sizeof(dev));
#else
return 0;
#endif
}
#endif