/* * Copyright (c) 2013 Google, Inc * * (C) Copyright 2012 * Pavel Herrmann * Marek Vasut * * SPDX-License-Identifier: GPL-2.0+ */ #ifndef _DM_DEVICE_H #define _DM_DEVICE_H #include #include #include #include struct driver_info; /* Driver is active (probed). Cleared when it is removed */ #define DM_FLAG_ACTIVATED (1 << 0) /* DM is responsible for allocating and freeing platdata */ #define DM_FLAG_ALLOC_PDATA (1 << 1) /* DM should init this device prior to relocation */ #define DM_FLAG_PRE_RELOC (1 << 2) /* DM is responsible for allocating and freeing parent_platdata */ #define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3) /** * struct udevice - An instance of a driver * * This holds information about a device, which is a driver bound to a * particular port or peripheral (essentially a driver instance). * * A device will come into existence through a 'bind' call, either due to * a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node * in the device tree (in which case of_offset is >= 0). In the latter case * we translate the device tree information into platdata in a function * implemented by the driver ofdata_to_platdata method (called just before the * probe method if the device has a device tree node. * * All three of platdata, priv and uclass_priv can be allocated by the * driver, or you can use the auto_alloc_size members of struct driver and * struct uclass_driver to have driver model do this automatically. * * @driver: The driver used by this device * @name: Name of device, typically the FDT node name * @platdata: Configuration data for this device * @parent_platdata: The parent bus's configuration data for this device * @of_offset: Device tree node offset for this device (- for none) * @of_id: Pointer to the udevice_id structure which created the device * @parent: Parent of this device, or NULL for the top level device * @priv: Private data for this device * @uclass: Pointer to uclass for this device * @uclass_priv: The uclass's private data for this device * @parent_priv: The parent's private data for this device * @uclass_node: Used by uclass to link its devices * @child_head: List of children of this device * @sibling_node: Next device in list of all devices * @flags: Flags for this device DM_FLAG_... * @req_seq: Requested sequence number for this device (-1 = any) * @seq: Allocated sequence number for this device (-1 = none). This is set up * when the device is probed and will be unique within the device's uclass. */ struct udevice { struct driver *driver; const char *name; void *platdata; void *parent_platdata; int of_offset; const struct udevice_id *of_id; struct udevice *parent; void *priv; struct uclass *uclass; void *uclass_priv; void *parent_priv; struct list_head uclass_node; struct list_head child_head; struct list_head sibling_node; uint32_t flags; int req_seq; int seq; }; /* Maximum sequence number supported */ #define DM_MAX_SEQ 999 /* Returns the operations for a device */ #define device_get_ops(dev) (dev->driver->ops) /* Returns non-zero if the device is active (probed and not removed) */ #define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED) /** * struct udevice_id - Lists the compatible strings supported by a driver * @compatible: Compatible string * @data: Data for this compatible string */ struct udevice_id { const char *compatible; ulong data; }; #ifdef CONFIG_OF_CONTROL #define of_match_ptr(_ptr) (_ptr) #else #define of_match_ptr(_ptr) NULL #endif /* CONFIG_OF_CONTROL */ /** * struct driver - A driver for a feature or peripheral * * This holds methods for setting up a new device, and also removing it. * The device needs information to set itself up - this is provided either * by platdata or a device tree node (which we find by looking up * matching compatible strings with of_match). * * Drivers all belong to a uclass, representing a class of devices of the * same type. Common elements of the drivers can be implemented in the uclass, * or the uclass can provide a consistent interface to the drivers within * it. * * @name: Device name * @id: Identiies the uclass we belong to * @of_match: List of compatible strings to match, and any identifying data * for each. * @bind: Called to bind a device to its driver * @probe: Called to probe a device, i.e. activate it * @remove: Called to remove a device, i.e. de-activate it * @unbind: Called to unbind a device from its driver * @ofdata_to_platdata: Called before probe to decode device tree data * @child_post_bind: Called after a new child has been bound * @child_pre_probe: Called before a child device is probed. The device has * memory allocated but it has not yet been probed. * @child_post_remove: Called after a child device is removed. The device * has memory allocated but its device_remove() method has been called. * @priv_auto_alloc_size: If non-zero this is the size of the private data * to be allocated in the device's ->priv pointer. If zero, then the driver * is responsible for allocating any data required. * @platdata_auto_alloc_size: If non-zero this is the size of the * platform data to be allocated in the device's ->platdata pointer. * This is typically only useful for device-tree-aware drivers (those with * an of_match), since drivers which use platdata will have the data * provided in the U_BOOT_DEVICE() instantiation. * @per_child_auto_alloc_size: Each device can hold private data owned by * its parent. If required this will be automatically allocated if this * value is non-zero. * TODO(sjg@chromium.org): I'm considering dropping this, and just having * device_probe_child() pass it in. So far the use case for allocating it * is SPI, but I found that unsatisfactory. Since it is here I will leave it * until things are clearer. * @per_child_platdata_auto_alloc_size: A bus likes to store information about * its children. If non-zero this is the size of this data, to be allocated * in the child's parent_platdata pointer. * @ops: Driver-specific operations. This is typically a list of function * pointers defined by the driver, to implement driver functions required by * the uclass. * @flags: driver flags - see DM_FLAGS_... */ struct driver { char *name; enum uclass_id id; const struct udevice_id *of_match; int (*bind)(struct udevice *dev); int (*probe)(struct udevice *dev); int (*remove)(struct udevice *dev); int (*unbind)(struct udevice *dev); int (*ofdata_to_platdata)(struct udevice *dev); int (*child_post_bind)(struct udevice *dev); int (*child_pre_probe)(struct udevice *dev); int (*child_post_remove)(struct udevice *dev); int priv_auto_alloc_size; int platdata_auto_alloc_size; int per_child_auto_alloc_size; int per_child_platdata_auto_alloc_size; const void *ops; /* driver-specific operations */ uint32_t flags; }; /* Declare a new U-Boot driver */ #define U_BOOT_DRIVER(__name) \ ll_entry_declare(struct driver, __name, driver) /** * dev_get_platdata() - 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_platdata(struct udevice *dev); /** * dev_get_parent_platdata() - 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_platdata(struct udevice *dev); /** * dev_get_parentdata() - Get the parent data for a device * * The parent 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_parentdata(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(struct udevice *dev); /** * struct 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(struct udevice *child); /** * dev_get_of_data() - get the device tree data used to bind a device * * When a device is bound using a device tree node, it matches a * particular compatible string as in struct udevice_id. This function * returns the associated data value for that compatible string */ ulong dev_get_of_data(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(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. * * @dev: Parent device to check * @index: Child index * @devp: Returns pointer to device */ int device_get_child(struct udevice *parent, int index, struct udevice **devp); /** * device_find_child_by_seq() - Find a child device based on a sequence * * This searches for a device with the given seq or req_seq. * * For seq, if an active device has this sequence it will be returned. * If there is no such device then this will return -ENODEV. * * For req_seq, if a device (whether activated or not) has this req_seq * value, that device will be returned. This is a strong indication that * the device will receive that sequence when activated. * * @parent: Parent device * @seq_or_req_seq: Sequence number to find (0=first) * @find_req_seq: true to find req_seq, false to find seq * @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_find_child_by_seq(struct udevice *parent, int seq_or_req_seq, bool find_req_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(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(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(struct udevice *parent, int seq, 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(struct udevice *parent, struct udevice **devp); /** * device_find_first_child() - Find the first 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); /** * dev_get_addr() - Get the reg property of a device * * @dev: Pointer to a device * * @return addr */ fdt_addr_t dev_get_addr(struct udevice *dev); #endif