include/dm/device.h

   1 /*
   2  * Copyright (c) 2013 Google, Inc
   3  *
   4  * (C) Copyright 2012
   5  * Pavel Herrmann <morpheus.ibis@gmail.com>
   6  * Marek Vasut <marex@denx.de>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #ifndef _DM_DEVICE_H
  12 #define _DM_DEVICE_H
  13
  14 #include <dm/uclass-id.h>
  15 #include <fdtdec.h>
  16 #include <linker_lists.h>
  17 #include <linux/compat.h>
  18 #include <linux/kernel.h>
  19 #include <linux/list.h>
  20
  21 struct driver_info;
  22
  23 /* Driver is active (probed). Cleared when it is removed */
  24 #define DM_FLAG_ACTIVATED               (1 << 0)
  25
  26 /* DM is responsible for allocating and freeing platdata */
  27 #define DM_FLAG_ALLOC_PDATA             (1 << 1)
  28
  29 /* DM should init this device prior to relocation */
  30 #define DM_FLAG_PRE_RELOC               (1 << 2)
  31
  32 /* DM is responsible for allocating and freeing parent_platdata */
  33 #define DM_FLAG_ALLOC_PARENT_PDATA      (1 << 3)
  34
  35 /* DM is responsible for allocating and freeing uclass_platdata */
  36 #define DM_FLAG_ALLOC_UCLASS_PDATA      (1 << 4)
  37
  38 /* Allocate driver private data on a DMA boundary */
  39 #define DM_FLAG_ALLOC_PRIV_DMA          (1 << 5)
  40
  41 /* Device is bound */
  42 #define DM_FLAG_BOUND                   (1 << 6)
  43
  44 /**
  45  * struct udevice - An instance of a driver
  46  *
  47  * This holds information about a device, which is a driver bound to a
  48  * particular port or peripheral (essentially a driver instance).
  49  *
  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.
  56  *
  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.
  60  *
  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
  68  *              its driver
  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
  85  */
  86 struct udevice {
  87         const struct driver *driver;
  88         const char *name;
  89         void *platdata;
  90         void *parent_platdata;
  91         void *uclass_platdata;
  92         int of_offset;
  93         ulong driver_data;
  94         struct udevice *parent;
  95         void *priv;
  96         struct uclass *uclass;
  97         void *uclass_priv;
  98         void *parent_priv;
  99         struct list_head uclass_node;
 100         struct list_head child_head;
 101         struct list_head sibling_node;
 102         uint32_t flags;
 103         int req_seq;
 104         int seq;
 105 #ifdef CONFIG_DEVRES
 106         struct list_head devres_head;
 107 #endif
 108 };
 109
 110 /* Maximum sequence number supported */
 111 #define DM_MAX_SEQ      999
 112
 113 /* Returns the operations for a device */
 114 #define device_get_ops(dev)     (dev->driver->ops)
 115
 116 /* Returns non-zero if the device is active (probed and not removed) */
 117 #define device_active(dev)      ((dev)->flags & DM_FLAG_ACTIVATED)
 118
 119 /**
 120  * struct udevice_id - Lists the compatible strings supported by a driver
 121  * @compatible: Compatible string
 122  * @data: Data for this compatible string
 123  */
 124 struct udevice_id {
 125         const char *compatible;
 126         ulong data;
 127 };
 128
 129 #if CONFIG_IS_ENABLED(OF_CONTROL)
 130 #define of_match_ptr(_ptr)      (_ptr)
 131 #else
 132 #define of_match_ptr(_ptr)      NULL
 133 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
 134
 135 /**
 136  * struct driver - A driver for a feature or peripheral
 137  *
 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).
 142  *
 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
 146  * it.
 147  *
 148  * @name: Device name
 149  * @id: Identiies the uclass we belong to
 150  * @of_match: List of compatible strings to match, and any identifying data
 151  * for each.
 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
 172  * value is non-zero.
 173  * @per_child_platdata_auto_alloc_size: A bus likes to store information about
 174  * its children. If non-zero this is the size of this data, to be allocated
 175  * in the child's parent_platdata pointer.
 176  * @ops: Driver-specific operations. This is typically a list of function
 177  * pointers defined by the driver, to implement driver functions required by
 178  * the uclass.
 179  * @flags: driver flags - see DM_FLAGS_...
 180  */
 181 struct driver {
 182         char *name;
 183         enum uclass_id id;
 184         const struct udevice_id *of_match;
 185         int (*bind)(struct udevice *dev);
 186         int (*probe)(struct udevice *dev);
 187         int (*remove)(struct udevice *dev);
 188         int (*unbind)(struct udevice *dev);
 189         int (*ofdata_to_platdata)(struct udevice *dev);
 190         int (*child_post_bind)(struct udevice *dev);
 191         int (*child_pre_probe)(struct udevice *dev);
 192         int (*child_post_remove)(struct udevice *dev);
 193         int priv_auto_alloc_size;
 194         int platdata_auto_alloc_size;
 195         int per_child_auto_alloc_size;
 196         int per_child_platdata_auto_alloc_size;
 197         const void *ops;        /* driver-specific operations */
 198         uint32_t flags;
 199 };
 200
 201 /* Declare a new U-Boot driver */
 202 #define U_BOOT_DRIVER(__name)                                           \
 203         ll_entry_declare(struct driver, __name, driver)
 204
 205 /**
 206  * dev_get_platdata() - Get the platform data for a device
 207  *
 208  * This checks that dev is not NULL, but no other checks for now
 209  *
 210  * @dev         Device to check
 211  * @return platform data, or NULL if none
 212  */
 213 void *dev_get_platdata(struct udevice *dev);
 214
 215 /**
 216  * dev_get_parent_platdata() - Get the parent platform data for a device
 217  *
 218  * This checks that dev is not NULL, but no other checks for now
 219  *
 220  * @dev         Device to check
 221  * @return parent's platform data, or NULL if none
 222  */
 223 void *dev_get_parent_platdata(struct udevice *dev);
 224
 225 /**
 226  * dev_get_uclass_platdata() - Get the uclass platform data for a device
 227  *
 228  * This checks that dev is not NULL, but no other checks for now
 229  *
 230  * @dev         Device to check
 231  * @return uclass's platform data, or NULL if none
 232  */
 233 void *dev_get_uclass_platdata(struct udevice *dev);
 234
 235 /**
 236  * dev_get_priv() - Get the private data for a device
 237  *
 238  * This checks that dev is not NULL, but no other checks for now
 239  *
 240  * @dev         Device to check
 241  * @return private data, or NULL if none
 242  */
 243 void *dev_get_priv(struct udevice *dev);
 244
 245 /**
 246  * dev_get_parent_priv() - Get the parent private data for a device
 247  *
 248  * The parent private data is data stored in the device but owned by the
 249  * parent. For example, a USB device may have parent data which contains
 250  * information about how to talk to the device over USB.
 251  *
 252  * This checks that dev is not NULL, but no other checks for now
 253  *
 254  * @dev         Device to check
 255  * @return parent data, or NULL if none
 256  */
 257 void *dev_get_parent_priv(struct udevice *dev);
 258
 259 /**
 260  * dev_get_uclass_priv() - Get the private uclass data for a device
 261  *
 262  * This checks that dev is not NULL, but no other checks for now
 263  *
 264  * @dev         Device to check
 265  * @return private uclass data for this device, or NULL if none
 266  */
 267 void *dev_get_uclass_priv(struct udevice *dev);
 268
 269 /**
 270  * struct dev_get_parent() - Get the parent of a device
 271  *
 272  * @child:      Child to check
 273  * @return parent of child, or NULL if this is the root device
 274  */
 275 struct udevice *dev_get_parent(struct udevice *child);
 276
 277 /**
 278  * dev_get_driver_data() - get the driver data used to bind a device
 279  *
 280  * When a device is bound using a device tree node, it matches a
 281  * particular compatible string in struct udevice_id. This function
 282  * returns the associated data value for that compatible string. This is
 283  * the 'data' field in struct udevice_id.
 284  *
 285  * As an example, consider this structure:
 286  * static const struct udevice_id tegra_i2c_ids[] = {
 287  *      { .compatible = "nvidia,tegra114-i2c", .data = TYPE_114 },
 288  *      { .compatible = "nvidia,tegra20-i2c", .data = TYPE_STD },
 289  *      { .compatible = "nvidia,tegra20-i2c-dvc", .data = TYPE_DVC },
 290  *      { }
 291  * };
 292  *
 293  * When driver model finds a driver for this it will store the 'data' value
 294  * corresponding to the compatible string it matches. This function returns
 295  * that value. This allows the driver to handle several variants of a device.
 296  *
 297  * For USB devices, this is the driver_info field in struct usb_device_id.
 298  *
 299  * @dev:        Device to check
 300  * @return driver data (0 if none is provided)
 301  */
 302 ulong dev_get_driver_data(struct udevice *dev);
 303
 304 /**
 305  * dev_get_driver_ops() - get the device's driver's operations
 306  *
 307  * This checks that dev is not NULL, and returns the pointer to device's
 308  * driver's operations.
 309  *
 310  * @dev:        Device to check
 311  * @return void pointer to driver's operations or NULL for NULL-dev or NULL-ops
 312  */
 313 const void *dev_get_driver_ops(struct udevice *dev);
 314
 315 /**
 316  * device_get_uclass_id() - return the uclass ID of a device
 317  *
 318  * @dev:        Device to check
 319  * @return uclass ID for the device
 320  */
 321 enum uclass_id device_get_uclass_id(struct udevice *dev);
 322
 323 /**
 324  * dev_get_uclass_name() - return the uclass name of a device
 325  *
 326  * This checks that dev is not NULL.
 327  *
 328  * @dev:        Device to check
 329  * @return  pointer to the uclass name for the device
 330  */
 331 const char *dev_get_uclass_name(struct udevice *dev);
 332
 333 /**
 334  * device_get_child() - Get the child of a device by index
 335  *
 336  * Returns the numbered child, 0 being the first. This does not use
 337  * sequence numbers, only the natural order.
 338  *
 339  * @dev:        Parent device to check
 340  * @index:      Child index
 341  * @devp:       Returns pointer to device
 342  * @return 0 if OK, -ENODEV if no such device, other error if the device fails
 343  *         to probe
 344  */
 345 int device_get_child(struct udevice *parent, int index, struct udevice **devp);
 346
 347 /**
 348  * device_find_child_by_seq() - Find a child device based on a sequence
 349  *
 350  * This searches for a device with the given seq or req_seq.
 351  *
 352  * For seq, if an active device has this sequence it will be returned.
 353  * If there is no such device then this will return -ENODEV.
 354  *
 355  * For req_seq, if a device (whether activated or not) has this req_seq
 356  * value, that device will be returned. This is a strong indication that
 357  * the device will receive that sequence when activated.
 358  *
 359  * @parent: Parent device
 360  * @seq_or_req_seq: Sequence number to find (0=first)
 361  * @find_req_seq: true to find req_seq, false to find seq
 362  * @devp: Returns pointer to device (there is only one per for each seq).
 363  * Set to NULL if none is found
 364  * @return 0 if OK, -ve on error
 365  */
 366 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
 367                              bool find_req_seq, struct udevice **devp);
 368
 369 /**
 370  * device_get_child_by_seq() - Get a child device based on a sequence
 371  *
 372  * If an active device has this sequence it will be returned. If there is no
 373  * such device then this will check for a device that is requesting this
 374  * sequence.
 375  *
 376  * The device is probed to activate it ready for use.
 377  *
 378  * @parent: Parent device
 379  * @seq: Sequence number to find (0=first)
 380  * @devp: Returns pointer to device (there is only one per for each seq)
 381  * Set to NULL if none is found
 382  * @return 0 if OK, -ve on error
 383  */
 384 int device_get_child_by_seq(struct udevice *parent, int seq,
 385                             struct udevice **devp);
 386
 387 /**
 388  * device_find_child_by_of_offset() - Find a child device based on FDT offset
 389  *
 390  * Locates a child device by its device tree offset.
 391  *
 392  * @parent: Parent device
 393  * @of_offset: Device tree offset to find
 394  * @devp: Returns pointer to device if found, otherwise this is set to NULL
 395  * @return 0 if OK, -ve on error
 396  */
 397 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
 398                                    struct udevice **devp);
 399
 400 /**
 401  * device_get_child_by_of_offset() - Get a child device based on FDT offset
 402  *
 403  * Locates a child device by its device tree offset.
 404  *
 405  * The device is probed to activate it ready for use.
 406  *
 407  * @parent: Parent device
 408  * @of_offset: Device tree offset to find
 409  * @devp: Returns pointer to device if found, otherwise this is set to NULL
 410  * @return 0 if OK, -ve on error
 411  */
 412 int device_get_child_by_of_offset(struct udevice *parent, int of_offset,
 413                                   struct udevice **devp);
 414
 415 /**
 416  * device_get_global_by_of_offset() - Get a device based on FDT offset
 417  *
 418  * Locates a device by its device tree offset, searching globally throughout
 419  * the all driver model devices.
 420  *
 421  * The device is probed to activate it ready for use.
 422  *
 423  * @of_offset: Device tree offset to find
 424  * @devp: Returns pointer to device if found, otherwise this is set to NULL
 425  * @return 0 if OK, -ve on error
 426  */
 427 int device_get_global_by_of_offset(int of_offset, struct udevice **devp);
 428
 429 /**
 430  * device_find_first_child() - Find the first child of a device
 431  *
 432  * @parent: Parent device to search
 433  * @devp: Returns first child device, or NULL if none
 434  * @return 0
 435  */
 436 int device_find_first_child(struct udevice *parent, struct udevice **devp);
 437
 438 /**
 439  * device_find_next_child() - Find the next child of a device
 440  *
 441  * @devp: Pointer to previous child device on entry. Returns pointer to next
 442  *              child device, or NULL if none
 443  * @return 0
 444  */
 445 int device_find_next_child(struct udevice **devp);
 446
 447 /**
 448  * dev_get_addr() - Get the reg property of a device
 449  *
 450  * @dev: Pointer to a device
 451  *
 452  * @return addr
 453  */
 454 fdt_addr_t dev_get_addr(struct udevice *dev);
 455
 456 /**
 457  * device_has_children() - check if a device has any children
 458  *
 459  * @dev:        Device to check
 460  * @return true if the device has one or more children
 461  */
 462 bool device_has_children(struct udevice *dev);
 463
 464 /**
 465  * device_has_active_children() - check if a device has any active children
 466  *
 467  * @dev:        Device to check
 468  * @return true if the device has one or more children and at least one of
 469  * them is active (probed).
 470  */
 471 bool device_has_active_children(struct udevice *dev);
 472
 473 /**
 474  * device_is_last_sibling() - check if a device is the last sibling
 475  *
 476  * This function can be useful for display purposes, when special action needs
 477  * to be taken when displaying the last sibling. This can happen when a tree
 478  * view of devices is being displayed.
 479  *
 480  * @dev:        Device to check
 481  * @return true if there are no more siblings after this one - i.e. is it
 482  * last in the list.
 483  */
 484 bool device_is_last_sibling(struct udevice *dev);
 485
 486 /**
 487  * device_set_name() - set the name of a device
 488  *
 489  * This must be called in the device's bind() method and no later. Normally
 490  * this is unnecessary but for probed devices which don't get a useful name
 491  * this function can be helpful.
 492  *
 493  * @dev:        Device to update
 494  * @name:       New name (this string is allocated new memory and attached to
 495  *              the device)
 496  * @return 0 if OK, -ENOMEM if there is not enough memory to allocate the
 497  * string
 498  */
 499 int device_set_name(struct udevice *dev, const char *name);
 500
 501 /**
 502  * device_is_on_pci_bus - Test if a device is on a PCI bus
 503  *
 504  * @dev:        device to test
 505  * @return:     true if it is on a PCI bus, false otherwise
 506  */
 507 static inline bool device_is_on_pci_bus(struct udevice *dev)
 508 {
 509         return device_get_uclass_id(dev->parent) == UCLASS_PCI;
 510 }
 511
 512 /* device resource management */
 513 typedef void (*dr_release_t)(struct udevice *dev, void *res);
 514 typedef int (*dr_match_t)(struct udevice *dev, void *res, void *match_data);
 515
 516 #ifdef CONFIG_DEVRES
 517
 518 #ifdef CONFIG_DEBUG_DEVRES
 519 void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 520                      const char *name);
 521 #define _devres_alloc(release, size, gfp) \
 522         __devres_alloc(release, size, gfp, #release)
 523 #else
 524 void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 525 #endif
 526
 527 /**
 528  * devres_alloc() - Allocate device resource data
 529  * @release: Release function devres will be associated with
 530  * @size: Allocation size
 531  * @gfp: Allocation flags
 532  *
 533  * Allocate devres of @size bytes.  The allocated area is associated
 534  * with @release.  The returned pointer can be passed to
 535  * other devres_*() functions.
 536  *
 537  * RETURNS:
 538  * Pointer to allocated devres on success, NULL on failure.
 539  */
 540 #define devres_alloc(release, size, gfp) \
 541         _devres_alloc(release, size, gfp | __GFP_ZERO)
 542
 543 /**
 544  * devres_free() - Free device resource data
 545  * @res: Pointer to devres data to free
 546  *
 547  * Free devres created with devres_alloc().
 548  */
 549 void devres_free(void *res);
 550
 551 /**
 552  * devres_add() - Register device resource
 553  * @dev: Device to add resource to
 554  * @res: Resource to register
 555  *
 556  * Register devres @res to @dev.  @res should have been allocated
 557  * using devres_alloc().  On driver detach, the associated release
 558  * function will be invoked and devres will be freed automatically.
 559  */
 560 void devres_add(struct udevice *dev, void *res);
 561
 562 /**
 563  * devres_find() - Find device resource
 564  * @dev: Device to lookup resource from
 565  * @release: Look for resources associated with this release function
 566  * @match: Match function (optional)
 567  * @match_data: Data for the match function
 568  *
 569  * Find the latest devres of @dev which is associated with @release
 570  * and for which @match returns 1.  If @match is NULL, it's considered
 571  * to match all.
 572  *
 573  * @return pointer to found devres, NULL if not found.
 574  */
 575 void *devres_find(struct udevice *dev, dr_release_t release,
 576                   dr_match_t match, void *match_data);
 577
 578 /**
 579  * devres_get() - Find devres, if non-existent, add one atomically
 580  * @dev: Device to lookup or add devres for
 581  * @new_res: Pointer to new initialized devres to add if not found
 582  * @match: Match function (optional)
 583  * @match_data: Data for the match function
 584  *
 585  * Find the latest devres of @dev which has the same release function
 586  * as @new_res and for which @match return 1.  If found, @new_res is
 587  * freed; otherwise, @new_res is added atomically.
 588  *
 589  * @return ointer to found or added devres.
 590  */
 591 void *devres_get(struct udevice *dev, void *new_res,
 592                  dr_match_t match, void *match_data);
 593
 594 /**
 595  * devres_remove() - Find a device resource and remove it
 596  * @dev: Device to find resource from
 597  * @release: Look for resources associated with this release function
 598  * @match: Match function (optional)
 599  * @match_data: Data for the match function
 600  *
 601  * Find the latest devres of @dev associated with @release and for
 602  * which @match returns 1.  If @match is NULL, it's considered to
 603  * match all.  If found, the resource is removed atomically and
 604  * returned.
 605  *
 606  * @return ointer to removed devres on success, NULL if not found.
 607  */
 608 void *devres_remove(struct udevice *dev, dr_release_t release,
 609                     dr_match_t match, void *match_data);
 610
 611 /**
 612  * devres_destroy() - Find a device resource and destroy it
 613  * @dev: Device to find resource from
 614  * @release: Look for resources associated with this release function
 615  * @match: Match function (optional)
 616  * @match_data: Data for the match function
 617  *
 618  * Find the latest devres of @dev associated with @release and for
 619  * which @match returns 1.  If @match is NULL, it's considered to
 620  * match all.  If found, the resource is removed atomically and freed.
 621  *
 622  * Note that the release function for the resource will not be called,
 623  * only the devres-allocated data will be freed.  The caller becomes
 624  * responsible for freeing any other data.
 625  *
 626  * @return 0 if devres is found and freed, -ENOENT if not found.
 627  */
 628 int devres_destroy(struct udevice *dev, dr_release_t release,
 629                    dr_match_t match, void *match_data);
 630
 631 /**
 632  * devres_release() - Find a device resource and destroy it, calling release
 633  * @dev: Device to find resource from
 634  * @release: Look for resources associated with this release function
 635  * @match: Match function (optional)
 636  * @match_data: Data for the match function
 637  *
 638  * Find the latest devres of @dev associated with @release and for
 639  * which @match returns 1.  If @match is NULL, it's considered to
 640  * match all.  If found, the resource is removed atomically, the
 641  * release function called and the resource freed.
 642  *
 643  * @return 0 if devres is found and freed, -ENOENT if not found.
 644  */
 645 int devres_release(struct udevice *dev, dr_release_t release,
 646                    dr_match_t match, void *match_data);
 647
 648 /* managed devm_k.alloc/kfree for device drivers */
 649 /**
 650  * devm_kmalloc() - Resource-managed kmalloc
 651  * @dev: Device to allocate memory for
 652  * @size: Allocation size
 653  * @gfp: Allocation gfp flags
 654  *
 655  * Managed kmalloc.  Memory allocated with this function is
 656  * automatically freed on driver detach.  Like all other devres
 657  * resources, guaranteed alignment is unsigned long long.
 658  *
 659  * @return pointer to allocated memory on success, NULL on failure.
 660  */
 661 void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp);
 662 static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
 663 {
 664         return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
 665 }
 666 static inline void *devm_kmalloc_array(struct udevice *dev,
 667                                        size_t n, size_t size, gfp_t flags)
 668 {
 669         if (size != 0 && n > SIZE_MAX / size)
 670                 return NULL;
 671         return devm_kmalloc(dev, n * size, flags);
 672 }
 673 static inline void *devm_kcalloc(struct udevice *dev,
 674                                  size_t n, size_t size, gfp_t flags)
 675 {
 676         return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
 677 }
 678
 679 /**
 680  * devm_kfree() - Resource-managed kfree
 681  * @dev: Device this memory belongs to
 682  * @ptr: Memory to free
 683  *
 684  * Free memory allocated with devm_kmalloc().
 685  */
 686 void devm_kfree(struct udevice *dev, void *ptr);
 687
 688 #else /* ! CONFIG_DEVRES */
 689
 690 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
 691 {
 692         return kzalloc(size, gfp);
 693 }
 694
 695 static inline void devres_free(void *res)
 696 {
 697         kfree(res);
 698 }
 699
 700 static inline void devres_add(struct udevice *dev, void *res)
 701 {
 702 }
 703
 704 static inline void *devres_find(struct udevice *dev, dr_release_t release,
 705                                 dr_match_t match, void *match_data)
 706 {
 707         return NULL;
 708 }
 709
 710 static inline void *devres_get(struct udevice *dev, void *new_res,
 711                                dr_match_t match, void *match_data)
 712 {
 713         return NULL;
 714 }
 715
 716 static inline void *devres_remove(struct udevice *dev, dr_release_t release,
 717                                   dr_match_t match, void *match_data)
 718 {
 719         return NULL;
 720 }
 721
 722 static inline int devres_destroy(struct udevice *dev, dr_release_t release,
 723                                  dr_match_t match, void *match_data)
 724 {
 725         return 0;
 726 }
 727
 728 static inline int devres_release(struct udevice *dev, dr_release_t release,
 729                                  dr_match_t match, void *match_data)
 730 {
 731         return 0;
 732 }
 733
 734 static inline void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
 735 {
 736         return kmalloc(size, gfp);
 737 }
 738
 739 static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
 740 {
 741         return kzalloc(size, gfp);
 742 }
 743
 744 static inline void *devm_kmaloc_array(struct udevice *dev,
 745                                       size_t n, size_t size, gfp_t flags)
 746 {
 747         /* TODO: add kmalloc_array() to linux/compat.h */
 748         if (size != 0 && n > SIZE_MAX / size)
 749                 return NULL;
 750         return kmalloc(n * size, flags);
 751 }
 752
 753 static inline void *devm_kcalloc(struct udevice *dev,
 754                                  size_t n, size_t size, gfp_t flags)
 755 {
 756         /* TODO: add kcalloc() to linux/compat.h */
 757         return kmalloc(n * size, flags | __GFP_ZERO);
 758 }
 759
 760 static inline void devm_kfree(struct udevice *dev, void *ptr)
 761 {
 762         kfree(ptr);
 763 }
 764
 765 #endif /* ! CONFIG_DEVRES */
 766
 767 #endif