2 * Copyright (c) 2013 Google, Inc
5 * Pavel Herrmann <morpheus.ibis@gmail.com>
6 * Marek Vasut <marex@denx.de>
8 * SPDX-License-Identifier: GPL-2.0+
14 #include <dm/uclass-id.h>
16 #include <linker_lists.h>
17 #include <linux/compat.h>
18 #include <linux/kernel.h>
19 #include <linux/list.h>
23 /* Driver is active (probed). Cleared when it is removed */
24 #define DM_FLAG_ACTIVATED (1 << 0)
26 /* DM is responsible for allocating and freeing platdata */
27 #define DM_FLAG_ALLOC_PDATA (1 << 1)
29 /* DM should init this device prior to relocation */
30 #define DM_FLAG_PRE_RELOC (1 << 2)
32 /* DM is responsible for allocating and freeing parent_platdata */
33 #define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
35 /* DM is responsible for allocating and freeing uclass_platdata */
36 #define DM_FLAG_ALLOC_UCLASS_PDATA (1 << 4)
38 /* Allocate driver private data on a DMA boundary */
39 #define DM_FLAG_ALLOC_PRIV_DMA (1 << 5)
42 #define DM_FLAG_BOUND (1 << 6)
45 * struct udevice - An instance of a driver
47 * This holds information about a device, which is a driver bound to a
48 * particular port or peripheral (essentially a driver instance).
50 * A device will come into existence through a 'bind' call, either due to
51 * a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node
52 * in the device tree (in which case of_offset is >= 0). In the latter case
53 * we translate the device tree information into platdata in a function
54 * implemented by the driver ofdata_to_platdata method (called just before the
55 * probe method if the device has a device tree node.
57 * All three of platdata, priv and uclass_priv can be allocated by the
58 * driver, or you can use the auto_alloc_size members of struct driver and
59 * struct uclass_driver to have driver model do this automatically.
61 * @driver: The driver used by this device
62 * @name: Name of device, typically the FDT node name
63 * @platdata: Configuration data for this device
64 * @parent_platdata: The parent bus's configuration data for this device
65 * @uclass_platdata: The uclass's configuration data for this device
66 * @of_offset: Device tree node offset for this device (- for none)
67 * @driver_data: Driver data word for the entry that matched this device with
69 * @parent: Parent of this device, or NULL for the top level device
70 * @priv: Private data for this device
71 * @uclass: Pointer to uclass for this device
72 * @uclass_priv: The uclass's private data for this device
73 * @parent_priv: The parent's private data for this device
74 * @uclass_node: Used by uclass to link its devices
75 * @child_head: List of children of this device
76 * @sibling_node: Next device in list of all devices
77 * @flags: Flags for this device DM_FLAG_...
78 * @req_seq: Requested sequence number for this device (-1 = any)
79 * @seq: Allocated sequence number for this device (-1 = none). This is set up
80 * when the device is probed and will be unique within the device's uclass.
81 * @devres_head: List of memory allocations associated with this device.
82 * When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will
83 * add to this list. Memory so-allocated will be freed
84 * automatically when the device is removed / unbound
87 const struct driver *driver;
90 void *parent_platdata;
91 void *uclass_platdata;
94 struct udevice *parent;
96 struct uclass *uclass;
99 struct list_head uclass_node;
100 struct list_head child_head;
101 struct list_head sibling_node;
106 struct list_head devres_head;
110 /* Maximum sequence number supported */
111 #define DM_MAX_SEQ 999
113 /* Returns the operations for a device */
114 #define device_get_ops(dev) (dev->driver->ops)
116 /* Returns non-zero if the device is active (probed and not removed) */
117 #define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED)
120 * struct udevice_id - Lists the compatible strings supported by a driver
121 * @compatible: Compatible string
122 * @data: Data for this compatible string
125 const char *compatible;
129 #if CONFIG_IS_ENABLED(OF_CONTROL)
130 #define of_match_ptr(_ptr) (_ptr)
132 #define of_match_ptr(_ptr) NULL
133 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
136 * struct driver - A driver for a feature or peripheral
138 * This holds methods for setting up a new device, and also removing it.
139 * The device needs information to set itself up - this is provided either
140 * by platdata or a device tree node (which we find by looking up
141 * matching compatible strings with of_match).
143 * Drivers all belong to a uclass, representing a class of devices of the
144 * same type. Common elements of the drivers can be implemented in the uclass,
145 * or the uclass can provide a consistent interface to the drivers within
149 * @id: Identiies the uclass we belong to
150 * @of_match: List of compatible strings to match, and any identifying data
152 * @bind: Called to bind a device to its driver
153 * @probe: Called to probe a device, i.e. activate it
154 * @remove: Called to remove a device, i.e. de-activate it
155 * @unbind: Called to unbind a device from its driver
156 * @ofdata_to_platdata: Called before probe to decode device tree data
157 * @child_post_bind: Called after a new child has been bound
158 * @child_pre_probe: Called before a child device is probed. The device has
159 * memory allocated but it has not yet been probed.
160 * @child_post_remove: Called after a child device is removed. The device
161 * has memory allocated but its device_remove() method has been called.
162 * @priv_auto_alloc_size: If non-zero this is the size of the private data
163 * to be allocated in the device's ->priv pointer. If zero, then the driver
164 * is responsible for allocating any data required.
165 * @platdata_auto_alloc_size: If non-zero this is the size of the
166 * platform data to be allocated in the device's ->platdata pointer.
167 * This is typically only useful for device-tree-aware drivers (those with
168 * an of_match), since drivers which use platdata will have the data
169 * provided in the U_BOOT_DEVICE() instantiation.
170 * @per_child_auto_alloc_size: Each device can hold private data owned by
171 * its parent. If required this will be automatically allocated if this
173 * TODO(sjg@chromium.org): I'm considering dropping this, and just having
174 * device_probe_child() pass it in. So far the use case for allocating it
175 * is SPI, but I found that unsatisfactory. Since it is here I will leave it
176 * until things are clearer.
177 * @per_child_platdata_auto_alloc_size: A bus likes to store information about
178 * its children. If non-zero this is the size of this data, to be allocated
179 * in the child's parent_platdata pointer.
180 * @ops: Driver-specific operations. This is typically a list of function
181 * pointers defined by the driver, to implement driver functions required by
183 * @flags: driver flags - see DM_FLAGS_...
188 const struct udevice_id *of_match;
189 int (*bind)(struct udevice *dev);
190 int (*probe)(struct udevice *dev);
191 int (*remove)(struct udevice *dev);
192 int (*unbind)(struct udevice *dev);
193 int (*ofdata_to_platdata)(struct udevice *dev);
194 int (*child_post_bind)(struct udevice *dev);
195 int (*child_pre_probe)(struct udevice *dev);
196 int (*child_post_remove)(struct udevice *dev);
197 int priv_auto_alloc_size;
198 int platdata_auto_alloc_size;
199 int per_child_auto_alloc_size;
200 int per_child_platdata_auto_alloc_size;
201 const void *ops; /* driver-specific operations */
205 /* Declare a new U-Boot driver */
206 #define U_BOOT_DRIVER(__name) \
207 ll_entry_declare(struct driver, __name, driver)
210 * dev_get_platdata() - Get the platform data for a device
212 * This checks that dev is not NULL, but no other checks for now
214 * @dev Device to check
215 * @return platform data, or NULL if none
217 void *dev_get_platdata(struct udevice *dev);
220 * dev_get_parent_platdata() - Get the parent platform data for a device
222 * This checks that dev is not NULL, but no other checks for now
224 * @dev Device to check
225 * @return parent's platform data, or NULL if none
227 void *dev_get_parent_platdata(struct udevice *dev);
230 * dev_get_uclass_platdata() - Get the uclass platform data for a device
232 * This checks that dev is not NULL, but no other checks for now
234 * @dev Device to check
235 * @return uclass's platform data, or NULL if none
237 void *dev_get_uclass_platdata(struct udevice *dev);
240 * dev_get_priv() - Get the private data for a device
242 * This checks that dev is not NULL, but no other checks for now
244 * @dev Device to check
245 * @return private data, or NULL if none
247 void *dev_get_priv(struct udevice *dev);
250 * dev_get_parent_priv() - Get the parent private data for a device
252 * The parent private data is data stored in the device but owned by the
253 * parent. For example, a USB device may have parent data which contains
254 * information about how to talk to the device over USB.
256 * This checks that dev is not NULL, but no other checks for now
258 * @dev Device to check
259 * @return parent data, or NULL if none
261 void *dev_get_parent_priv(struct udevice *dev);
264 * dev_get_uclass_priv() - Get the private uclass data for a device
266 * This checks that dev is not NULL, but no other checks for now
268 * @dev Device to check
269 * @return private uclass data for this device, or NULL if none
271 void *dev_get_uclass_priv(struct udevice *dev);
274 * struct dev_get_parent() - Get the parent of a device
276 * @child: Child to check
277 * @return parent of child, or NULL if this is the root device
279 struct udevice *dev_get_parent(struct udevice *child);
282 * dev_get_driver_data() - get the driver data used to bind a device
284 * When a device is bound using a device tree node, it matches a
285 * particular compatible string as in struct udevice_id. This function
286 * returns the associated data value for that compatible string. This is
287 * the 'data' field in struct udevice_id.
289 * For USB devices, this is the driver_info field in struct usb_device_id.
291 * @dev: Device to check
293 ulong dev_get_driver_data(struct udevice *dev);
296 * dev_get_driver_ops() - get the device's driver's operations
298 * This checks that dev is not NULL, and returns the pointer to device's
299 * driver's operations.
301 * @dev: Device to check
302 * @return void pointer to driver's operations or NULL for NULL-dev or NULL-ops
304 const void *dev_get_driver_ops(struct udevice *dev);
307 * device_get_uclass_id() - return the uclass ID of a device
309 * @dev: Device to check
310 * @return uclass ID for the device
312 enum uclass_id device_get_uclass_id(struct udevice *dev);
315 * dev_get_uclass_name() - return the uclass name of a device
317 * This checks that dev is not NULL.
319 * @dev: Device to check
320 * @return pointer to the uclass name for the device
322 const char *dev_get_uclass_name(struct udevice *dev);
325 * device_get_child() - Get the child of a device by index
327 * Returns the numbered child, 0 being the first. This does not use
328 * sequence numbers, only the natural order.
330 * @dev: Parent device to check
331 * @index: Child index
332 * @devp: Returns pointer to device
333 * @return 0 if OK, -ENODEV if no such device, other error if the device fails
336 int device_get_child(struct udevice *parent, int index, struct udevice **devp);
339 * device_find_child_by_seq() - Find a child device based on a sequence
341 * This searches for a device with the given seq or req_seq.
343 * For seq, if an active device has this sequence it will be returned.
344 * If there is no such device then this will return -ENODEV.
346 * For req_seq, if a device (whether activated or not) has this req_seq
347 * value, that device will be returned. This is a strong indication that
348 * the device will receive that sequence when activated.
350 * @parent: Parent device
351 * @seq_or_req_seq: Sequence number to find (0=first)
352 * @find_req_seq: true to find req_seq, false to find seq
353 * @devp: Returns pointer to device (there is only one per for each seq).
354 * Set to NULL if none is found
355 * @return 0 if OK, -ve on error
357 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
358 bool find_req_seq, struct udevice **devp);
361 * device_get_child_by_seq() - Get a child device based on a sequence
363 * If an active device has this sequence it will be returned. If there is no
364 * such device then this will check for a device that is requesting this
367 * The device is probed to activate it ready for use.
369 * @parent: Parent device
370 * @seq: Sequence number to find (0=first)
371 * @devp: Returns pointer to device (there is only one per for each seq)
372 * Set to NULL if none is found
373 * @return 0 if OK, -ve on error
375 int device_get_child_by_seq(struct udevice *parent, int seq,
376 struct udevice **devp);
379 * device_find_child_by_of_offset() - Find a child device based on FDT offset
381 * Locates a child device by its device tree offset.
383 * @parent: Parent device
384 * @of_offset: Device tree offset to find
385 * @devp: Returns pointer to device if found, otherwise this is set to NULL
386 * @return 0 if OK, -ve on error
388 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
389 struct udevice **devp);
392 * device_get_child_by_of_offset() - Get a child device based on FDT offset
394 * Locates a child device by its device tree offset.
396 * The device is probed to activate it ready for use.
398 * @parent: Parent device
399 * @of_offset: Device tree offset to find
400 * @devp: Returns pointer to device if found, otherwise this is set to NULL
401 * @return 0 if OK, -ve on error
403 int device_get_child_by_of_offset(struct udevice *parent, int of_offset,
404 struct udevice **devp);
407 * device_get_global_by_of_offset() - Get a device based on FDT offset
409 * Locates a device by its device tree offset, searching globally throughout
410 * the all driver model devices.
412 * The device is probed to activate it ready for use.
414 * @of_offset: Device tree offset to find
415 * @devp: Returns pointer to device if found, otherwise this is set to NULL
416 * @return 0 if OK, -ve on error
418 int device_get_global_by_of_offset(int of_offset, struct udevice **devp);
421 * device_find_first_child() - Find the first child of a device
423 * @parent: Parent device to search
424 * @devp: Returns first child device, or NULL if none
427 int device_find_first_child(struct udevice *parent, struct udevice **devp);
430 * device_find_next_child() - Find the next child of a device
432 * @devp: Pointer to previous child device on entry. Returns pointer to next
433 * child device, or NULL if none
436 int device_find_next_child(struct udevice **devp);
439 * dev_get_addr() - Get the reg property of a device
441 * @dev: Pointer to a device
445 fdt_addr_t dev_get_addr(struct udevice *dev);
448 * device_has_children() - check if a device has any children
450 * @dev: Device to check
451 * @return true if the device has one or more children
453 bool device_has_children(struct udevice *dev);
456 * device_has_active_children() - check if a device has any active children
458 * @dev: Device to check
459 * @return true if the device has one or more children and at least one of
460 * them is active (probed).
462 bool device_has_active_children(struct udevice *dev);
465 * device_is_last_sibling() - check if a device is the last sibling
467 * This function can be useful for display purposes, when special action needs
468 * to be taken when displaying the last sibling. This can happen when a tree
469 * view of devices is being displayed.
471 * @dev: Device to check
472 * @return true if there are no more siblings after this one - i.e. is it
475 bool device_is_last_sibling(struct udevice *dev);
478 * device_set_name() - set the name of a device
480 * This must be called in the device's bind() method and no later. Normally
481 * this is unnecessary but for probed devices which don't get a useful name
482 * this function can be helpful.
484 * @dev: Device to update
485 * @name: New name (this string is allocated new memory and attached to
487 * @return 0 if OK, -ENOMEM if there is not enough memory to allocate the
490 int device_set_name(struct udevice *dev, const char *name);
493 * device_is_on_pci_bus - Test if a device is on a PCI bus
495 * @dev: device to test
496 * @return: true if it is on a PCI bus, false otherwise
498 static inline bool device_is_on_pci_bus(struct udevice *dev)
500 return device_get_uclass_id(dev->parent) == UCLASS_PCI;
503 /* device resource management */
504 typedef void (*dr_release_t)(struct udevice *dev, void *res);
505 typedef int (*dr_match_t)(struct udevice *dev, void *res, void *match_data);
509 #ifdef CONFIG_DEBUG_DEVRES
510 void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
512 #define _devres_alloc(release, size, gfp) \
513 __devres_alloc(release, size, gfp, #release)
515 void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
519 * devres_alloc() - Allocate device resource data
520 * @release: Release function devres will be associated with
521 * @size: Allocation size
522 * @gfp: Allocation flags
524 * Allocate devres of @size bytes. The allocated area is associated
525 * with @release. The returned pointer can be passed to
526 * other devres_*() functions.
529 * Pointer to allocated devres on success, NULL on failure.
531 #define devres_alloc(release, size, gfp) \
532 _devres_alloc(release, size, gfp | __GFP_ZERO)
535 * devres_free() - Free device resource data
536 * @res: Pointer to devres data to free
538 * Free devres created with devres_alloc().
540 void devres_free(void *res);
543 * devres_add() - Register device resource
544 * @dev: Device to add resource to
545 * @res: Resource to register
547 * Register devres @res to @dev. @res should have been allocated
548 * using devres_alloc(). On driver detach, the associated release
549 * function will be invoked and devres will be freed automatically.
551 void devres_add(struct udevice *dev, void *res);
554 * devres_find() - Find device resource
555 * @dev: Device to lookup resource from
556 * @release: Look for resources associated with this release function
557 * @match: Match function (optional)
558 * @match_data: Data for the match function
560 * Find the latest devres of @dev which is associated with @release
561 * and for which @match returns 1. If @match is NULL, it's considered
564 * @return pointer to found devres, NULL if not found.
566 void *devres_find(struct udevice *dev, dr_release_t release,
567 dr_match_t match, void *match_data);
570 * devres_get() - Find devres, if non-existent, add one atomically
571 * @dev: Device to lookup or add devres for
572 * @new_res: Pointer to new initialized devres to add if not found
573 * @match: Match function (optional)
574 * @match_data: Data for the match function
576 * Find the latest devres of @dev which has the same release function
577 * as @new_res and for which @match return 1. If found, @new_res is
578 * freed; otherwise, @new_res is added atomically.
580 * @return ointer to found or added devres.
582 void *devres_get(struct udevice *dev, void *new_res,
583 dr_match_t match, void *match_data);
586 * devres_remove() - Find a device resource and remove it
587 * @dev: Device to find resource from
588 * @release: Look for resources associated with this release function
589 * @match: Match function (optional)
590 * @match_data: Data for the match function
592 * Find the latest devres of @dev associated with @release and for
593 * which @match returns 1. If @match is NULL, it's considered to
594 * match all. If found, the resource is removed atomically and
597 * @return ointer to removed devres on success, NULL if not found.
599 void *devres_remove(struct udevice *dev, dr_release_t release,
600 dr_match_t match, void *match_data);
603 * devres_destroy() - Find a device resource and destroy it
604 * @dev: Device to find resource from
605 * @release: Look for resources associated with this release function
606 * @match: Match function (optional)
607 * @match_data: Data for the match function
609 * Find the latest devres of @dev associated with @release and for
610 * which @match returns 1. If @match is NULL, it's considered to
611 * match all. If found, the resource is removed atomically and freed.
613 * Note that the release function for the resource will not be called,
614 * only the devres-allocated data will be freed. The caller becomes
615 * responsible for freeing any other data.
617 * @return 0 if devres is found and freed, -ENOENT if not found.
619 int devres_destroy(struct udevice *dev, dr_release_t release,
620 dr_match_t match, void *match_data);
623 * devres_release() - Find a device resource and destroy it, calling release
624 * @dev: Device to find resource from
625 * @release: Look for resources associated with this release function
626 * @match: Match function (optional)
627 * @match_data: Data for the match function
629 * Find the latest devres of @dev associated with @release and for
630 * which @match returns 1. If @match is NULL, it's considered to
631 * match all. If found, the resource is removed atomically, the
632 * release function called and the resource freed.
634 * @return 0 if devres is found and freed, -ENOENT if not found.
636 int devres_release(struct udevice *dev, dr_release_t release,
637 dr_match_t match, void *match_data);
639 /* managed devm_k.alloc/kfree for device drivers */
641 * devm_kmalloc() - Resource-managed kmalloc
642 * @dev: Device to allocate memory for
643 * @size: Allocation size
644 * @gfp: Allocation gfp flags
646 * Managed kmalloc. Memory allocated with this function is
647 * automatically freed on driver detach. Like all other devres
648 * resources, guaranteed alignment is unsigned long long.
650 * @return pointer to allocated memory on success, NULL on failure.
652 void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp);
653 static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
655 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
657 static inline void *devm_kmalloc_array(struct udevice *dev,
658 size_t n, size_t size, gfp_t flags)
660 if (size != 0 && n > SIZE_MAX / size)
662 return devm_kmalloc(dev, n * size, flags);
664 static inline void *devm_kcalloc(struct udevice *dev,
665 size_t n, size_t size, gfp_t flags)
667 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
671 * devm_kfree() - Resource-managed kfree
672 * @dev: Device this memory belongs to
673 * @ptr: Memory to free
675 * Free memory allocated with devm_kmalloc().
677 void devm_kfree(struct udevice *dev, void *ptr);
679 #else /* ! CONFIG_DEVRES */
681 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
683 return kzalloc(size, gfp);
686 static inline void devres_free(void *res)
691 static inline void devres_add(struct udevice *dev, void *res)
695 static inline void *devres_find(struct udevice *dev, dr_release_t release,
696 dr_match_t match, void *match_data)
701 static inline void *devres_get(struct udevice *dev, void *new_res,
702 dr_match_t match, void *match_data)
707 static inline void *devres_remove(struct udevice *dev, dr_release_t release,
708 dr_match_t match, void *match_data)
713 static inline int devres_destroy(struct udevice *dev, dr_release_t release,
714 dr_match_t match, void *match_data)
719 static inline int devres_release(struct udevice *dev, dr_release_t release,
720 dr_match_t match, void *match_data)
725 static inline void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
727 return kmalloc(size, gfp);
730 static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
732 return kzalloc(size, gfp);
735 static inline void *devm_kmaloc_array(struct udevice *dev,
736 size_t n, size_t size, gfp_t flags)
738 /* TODO: add kmalloc_array() to linux/compat.h */
739 if (size != 0 && n > SIZE_MAX / size)
741 return kmalloc(n * size, flags);
744 static inline void *devm_kcalloc(struct udevice *dev,
745 size_t n, size_t size, gfp_t flags)
747 /* TODO: add kcalloc() to linux/compat.h */
748 return kmalloc(n * size, flags | __GFP_ZERO);
751 static inline void devm_kfree(struct udevice *dev, void *ptr)
756 #endif /* ! CONFIG_DEVRES */