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Simon Glass6494d702014-02-26 15:59:18 -07001/*
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>
Peng Fanc9cac3f2015-02-10 14:46:32 +080015#include <fdtdec.h>
Simon Glass6494d702014-02-26 15:59:18 -070016#include <linker_lists.h>
Masahiro Yamada2b07f682015-07-25 21:52:36 +090017#include <linux/compat.h>
18#include <linux/kernel.h>
Simon Glass6494d702014-02-26 15:59:18 -070019#include <linux/list.h>
20
21struct driver_info;
22
23/* Driver is active (probed). Cleared when it is removed */
Simon Glassfb04c9d2015-09-28 23:32:03 -060024#define DM_FLAG_ACTIVATED (1 << 0)
Simon Glass6494d702014-02-26 15:59:18 -070025
26/* DM is responsible for allocating and freeing platdata */
Simon Glassfb04c9d2015-09-28 23:32:03 -060027#define DM_FLAG_ALLOC_PDATA (1 << 1)
Simon Glass6494d702014-02-26 15:59:18 -070028
Simon Glass00606d72014-07-23 06:55:03 -060029/* DM should init this device prior to relocation */
Simon Glassfb04c9d2015-09-28 23:32:03 -060030#define DM_FLAG_PRE_RELOC (1 << 2)
Simon Glass00606d72014-07-23 06:55:03 -060031
Simon Glasscdc133b2015-01-25 08:27:01 -070032/* DM is responsible for allocating and freeing parent_platdata */
33#define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
34
Przemyslaw Marczak5eaed882015-04-15 13:07:18 +020035/* DM is responsible for allocating and freeing uclass_platdata */
36#define DM_FLAG_ALLOC_UCLASS_PDATA (1 << 4)
37
Simon Glass2c03c462015-03-25 12:21:53 -060038/* Allocate driver private data on a DMA boundary */
Simon Glassfb04c9d2015-09-28 23:32:03 -060039#define DM_FLAG_ALLOC_PRIV_DMA (1 << 5)
Simon Glass2c03c462015-03-25 12:21:53 -060040
Masahiro Yamadaaed1a4d2015-07-25 21:52:34 +090041/* Device is bound */
Simon Glassfb04c9d2015-09-28 23:32:03 -060042#define DM_FLAG_BOUND (1 << 6)
Masahiro Yamadaaed1a4d2015-07-25 21:52:34 +090043
Simon Glass6494d702014-02-26 15:59:18 -070044/**
Heiko Schocher54c5d082014-05-22 12:43:05 +020045 * struct udevice - An instance of a driver
Simon Glass6494d702014-02-26 15:59:18 -070046 *
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
Simon Glasscdc133b2015-01-25 08:27:01 -070064 * @parent_platdata: The parent bus's configuration data for this device
Przemyslaw Marczak5eaed882015-04-15 13:07:18 +020065 * @uclass_platdata: The uclass's configuration data for this device
Simon Glass6494d702014-02-26 15:59:18 -070066 * @of_offset: Device tree node offset for this device (- for none)
Simon Glass39de8432015-03-25 12:21:55 -060067 * @driver_data: Driver data word for the entry that matched this device with
68 * its driver
Simon Glass6494d702014-02-26 15:59:18 -070069 * @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
Simon Glasse59f4582014-07-23 06:55:20 -060073 * @parent_priv: The parent's private data for this device
Simon Glass6494d702014-02-26 15:59:18 -070074 * @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_...
Simon Glass5a66a8f2014-07-23 06:55:12 -060078 * @req_seq: Requested sequence number for this device (-1 = any)
Simon Glass547cea12014-10-13 23:41:51 -060079 * @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.
Simon Glass93c7fe42015-09-28 23:32:04 -060081 * @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
Simon Glass6494d702014-02-26 15:59:18 -070085 */
Heiko Schocher54c5d082014-05-22 12:43:05 +020086struct udevice {
Simon Glass34792532015-03-25 12:21:54 -060087 const struct driver *driver;
Simon Glass6494d702014-02-26 15:59:18 -070088 const char *name;
89 void *platdata;
Simon Glasscdc133b2015-01-25 08:27:01 -070090 void *parent_platdata;
Przemyslaw Marczak5eaed882015-04-15 13:07:18 +020091 void *uclass_platdata;
Simon Glass6494d702014-02-26 15:59:18 -070092 int of_offset;
Simon Glass39de8432015-03-25 12:21:55 -060093 ulong driver_data;
Heiko Schocher54c5d082014-05-22 12:43:05 +020094 struct udevice *parent;
Simon Glass6494d702014-02-26 15:59:18 -070095 void *priv;
96 struct uclass *uclass;
97 void *uclass_priv;
Simon Glasse59f4582014-07-23 06:55:20 -060098 void *parent_priv;
Simon Glass6494d702014-02-26 15:59:18 -070099 struct list_head uclass_node;
100 struct list_head child_head;
101 struct list_head sibling_node;
102 uint32_t flags;
Simon Glass5a66a8f2014-07-23 06:55:12 -0600103 int req_seq;
104 int seq;
Masahiro Yamadae2282d72015-07-25 21:52:37 +0900105#ifdef CONFIG_DEVRES
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900106 struct list_head devres_head;
Masahiro Yamadae2282d72015-07-25 21:52:37 +0900107#endif
Simon Glass6494d702014-02-26 15:59:18 -0700108};
109
Simon Glass5a66a8f2014-07-23 06:55:12 -0600110/* Maximum sequence number supported */
111#define DM_MAX_SEQ 999
112
Simon Glass6494d702014-02-26 15:59:18 -0700113/* 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/**
Simon Glassae7f4512014-06-11 23:29:45 -0600120 * struct udevice_id - Lists the compatible strings supported by a driver
Simon Glass6494d702014-02-26 15:59:18 -0700121 * @compatible: Compatible string
122 * @data: Data for this compatible string
123 */
Simon Glassae7f4512014-06-11 23:29:45 -0600124struct udevice_id {
Simon Glass6494d702014-02-26 15:59:18 -0700125 const char *compatible;
126 ulong data;
127};
128
Masahiro Yamada0f925822015-08-12 07:31:55 +0900129#if CONFIG_IS_ENABLED(OF_CONTROL)
Masahiro Yamadaf887cb62014-10-07 14:51:31 +0900130#define of_match_ptr(_ptr) (_ptr)
131#else
132#define of_match_ptr(_ptr) NULL
Masahiro Yamada0f925822015-08-12 07:31:55 +0900133#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
Masahiro Yamadaf887cb62014-10-07 14:51:31 +0900134
Simon Glass6494d702014-02-26 15:59:18 -0700135/**
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
Simon Glass0118ce72015-01-25 08:27:03 -0700157 * @child_post_bind: Called after a new child has been bound
Simon Glassa327dee2014-07-23 06:55:21 -0600158 * @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.
Simon Glass6494d702014-02-26 15:59:18 -0700162 * @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.
Simon Glasse59f4582014-07-23 06:55:20 -0600170 * @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.
Simon Glasscdc133b2015-01-25 08:27:01 -0700173 * @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.
Simon Glass0040b942014-07-23 06:55:17 -0600176 * @ops: Driver-specific operations. This is typically a list of function
Simon Glass6494d702014-02-26 15:59:18 -0700177 * pointers defined by the driver, to implement driver functions required by
178 * the uclass.
Simon Glass00606d72014-07-23 06:55:03 -0600179 * @flags: driver flags - see DM_FLAGS_...
Simon Glass6494d702014-02-26 15:59:18 -0700180 */
181struct driver {
182 char *name;
183 enum uclass_id id;
Simon Glassae7f4512014-06-11 23:29:45 -0600184 const struct udevice_id *of_match;
Heiko Schocher54c5d082014-05-22 12:43:05 +0200185 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);
Simon Glass0118ce72015-01-25 08:27:03 -0700190 int (*child_post_bind)(struct udevice *dev);
Simon Glassa327dee2014-07-23 06:55:21 -0600191 int (*child_pre_probe)(struct udevice *dev);
192 int (*child_post_remove)(struct udevice *dev);
Simon Glass6494d702014-02-26 15:59:18 -0700193 int priv_auto_alloc_size;
194 int platdata_auto_alloc_size;
Simon Glasse59f4582014-07-23 06:55:20 -0600195 int per_child_auto_alloc_size;
Simon Glasscdc133b2015-01-25 08:27:01 -0700196 int per_child_platdata_auto_alloc_size;
Simon Glass6494d702014-02-26 15:59:18 -0700197 const void *ops; /* driver-specific operations */
Simon Glass00606d72014-07-23 06:55:03 -0600198 uint32_t flags;
Simon Glass6494d702014-02-26 15:59:18 -0700199};
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 */
Heiko Schocher54c5d082014-05-22 12:43:05 +0200213void *dev_get_platdata(struct udevice *dev);
Simon Glass6494d702014-02-26 15:59:18 -0700214
215/**
Simon Glasscdc133b2015-01-25 08:27:01 -0700216 * 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 */
223void *dev_get_parent_platdata(struct udevice *dev);
224
225/**
Przemyslaw Marczak5eaed882015-04-15 13:07:18 +0200226 * 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 */
233void *dev_get_uclass_platdata(struct udevice *dev);
234
235/**
Simon Glass9a79f6e2015-09-28 23:32:02 -0600236 * 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 */
243void *dev_get_priv(struct udevice *dev);
244
245/**
Simon Glassbcbe3d12015-09-28 23:32:01 -0600246 * dev_get_parent_priv() - Get the parent private data for a device
Simon Glasse59f4582014-07-23 06:55:20 -0600247 *
Simon Glassbcbe3d12015-09-28 23:32:01 -0600248 * 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.
Simon Glasse59f4582014-07-23 06:55:20 -0600251 *
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 */
Simon Glassbcbe3d12015-09-28 23:32:01 -0600257void *dev_get_parent_priv(struct udevice *dev);
Simon Glasse59f4582014-07-23 06:55:20 -0600258
259/**
Simon Glasse564f052015-03-05 12:25:20 -0700260 * 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 */
267void *dev_get_uclass_priv(struct udevice *dev);
268
269/**
Simon Glass9a79f6e2015-09-28 23:32:02 -0600270 * 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 */
275struct udevice *dev_get_parent(struct udevice *child);
276
277/**
Simon Glass39de8432015-03-25 12:21:55 -0600278 * dev_get_driver_data() - get the driver data used to bind a device
Simon Glass2ef249b2014-11-11 10:46:18 -0700279 *
280 * When a device is bound using a device tree node, it matches a
Simon Glass8d1f3a92015-09-28 23:32:06 -0600281 * particular compatible string in struct udevice_id. This function
Simon Glass39de8432015-03-25 12:21:55 -0600282 * returns the associated data value for that compatible string. This is
283 * the 'data' field in struct udevice_id.
284 *
Simon Glass8d1f3a92015-09-28 23:32:06 -0600285 * 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 *
Simon Glass39de8432015-03-25 12:21:55 -0600297 * For USB devices, this is the driver_info field in struct usb_device_id.
298 *
299 * @dev: Device to check
Simon Glass8d1f3a92015-09-28 23:32:06 -0600300 * @return driver data (0 if none is provided)
Simon Glass2ef249b2014-11-11 10:46:18 -0700301 */
Simon Glass39de8432015-03-25 12:21:55 -0600302ulong dev_get_driver_data(struct udevice *dev);
Simon Glass2ef249b2014-11-11 10:46:18 -0700303
Przemyslaw Marczakcc73d372015-04-15 13:07:24 +0200304/**
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 */
313const void *dev_get_driver_ops(struct udevice *dev);
314
Simon Glass8d1f3a92015-09-28 23:32:06 -0600315/**
Simon Glassb3670532015-01-25 08:27:04 -0700316 * 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 */
321enum uclass_id device_get_uclass_id(struct udevice *dev);
322
Simon Glass8d1f3a92015-09-28 23:32:06 -0600323/**
Przemyslaw Marczakf9c370d2015-04-15 13:07:25 +0200324 * 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 */
331const char *dev_get_uclass_name(struct udevice *dev);
332
Simon Glass2ef249b2014-11-11 10:46:18 -0700333/**
Simon Glass997c87b2014-07-23 06:55:19 -0600334 * 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
Simon Glass3f416f32015-07-27 15:47:19 -0600342 * @return 0 if OK, -ENODEV if no such device, other error if the device fails
343 * to probe
Simon Glass997c87b2014-07-23 06:55:19 -0600344 */
345int device_get_child(struct udevice *parent, int index, struct udevice **devp);
346
347/**
Simon Glass5a66a8f2014-07-23 06:55:12 -0600348 * 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 */
366int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
367 bool find_req_seq, struct udevice **devp);
368
Simon Glass997c87b2014-07-23 06:55:19 -0600369/**
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 */
384int 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 */
397int 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 */
Simon Glass132f9bf2015-06-23 15:38:38 -0600412int device_get_child_by_of_offset(struct udevice *parent, int of_offset,
Simon Glass997c87b2014-07-23 06:55:19 -0600413 struct udevice **devp);
414
Simon Glassa8981d42014-10-13 23:41:49 -0600415/**
Simon Glass26930472015-06-23 15:38:37 -0600416 * 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 */
427int device_get_global_by_of_offset(int of_offset, struct udevice **devp);
428
429/**
Simon Glassa8981d42014-10-13 23:41:49 -0600430 * 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 */
436int device_find_first_child(struct udevice *parent, struct udevice **devp);
437
438/**
Simon Glass3f416f32015-07-27 15:47:19 -0600439 * device_find_next_child() - Find the next child of a device
Simon Glassa8981d42014-10-13 23:41:49 -0600440 *
441 * @devp: Pointer to previous child device on entry. Returns pointer to next
442 * child device, or NULL if none
443 * @return 0
444 */
445int device_find_next_child(struct udevice **devp);
446
Peng Fanc9cac3f2015-02-10 14:46:32 +0800447/**
448 * dev_get_addr() - Get the reg property of a device
449 *
450 * @dev: Pointer to a device
451 *
452 * @return addr
453 */
454fdt_addr_t dev_get_addr(struct udevice *dev);
455
Simon Glassc5785672015-03-25 12:21:57 -0600456/**
Mugunthan V N69b41382015-12-23 20:39:36 +0530457 * dev_get_addr_index() - Get the indexed reg property of a device
458 *
459 * @dev: Pointer to a device
460 * @index: the 'reg' property can hold a list of <addr, size> pairs
461 * and @index is used to select which one is required
462 *
463 * @return addr
464 */
465fdt_addr_t dev_get_addr_index(struct udevice *dev, int index);
466
467/**
Simon Glassc5785672015-03-25 12:21:57 -0600468 * device_has_children() - check if a device has any children
469 *
470 * @dev: Device to check
471 * @return true if the device has one or more children
472 */
473bool device_has_children(struct udevice *dev);
474
475/**
476 * device_has_active_children() - check if a device has any active children
477 *
478 * @dev: Device to check
479 * @return true if the device has one or more children and at least one of
480 * them is active (probed).
481 */
482bool device_has_active_children(struct udevice *dev);
483
484/**
485 * device_is_last_sibling() - check if a device is the last sibling
486 *
487 * This function can be useful for display purposes, when special action needs
488 * to be taken when displaying the last sibling. This can happen when a tree
489 * view of devices is being displayed.
490 *
491 * @dev: Device to check
492 * @return true if there are no more siblings after this one - i.e. is it
493 * last in the list.
494 */
495bool device_is_last_sibling(struct udevice *dev);
496
Simon Glassf5c67ea2015-07-30 13:40:39 -0600497/**
498 * device_set_name() - set the name of a device
499 *
500 * This must be called in the device's bind() method and no later. Normally
501 * this is unnecessary but for probed devices which don't get a useful name
502 * this function can be helpful.
503 *
504 * @dev: Device to update
505 * @name: New name (this string is allocated new memory and attached to
506 * the device)
507 * @return 0 if OK, -ENOMEM if there is not enough memory to allocate the
508 * string
509 */
510int device_set_name(struct udevice *dev, const char *name);
511
Bin Meng1e0f2262015-09-11 03:24:34 -0700512/**
513 * device_is_on_pci_bus - Test if a device is on a PCI bus
514 *
515 * @dev: device to test
516 * @return: true if it is on a PCI bus, false otherwise
517 */
518static inline bool device_is_on_pci_bus(struct udevice *dev)
519{
520 return device_get_uclass_id(dev->parent) == UCLASS_PCI;
521}
522
Simon Glass7aeac5b2015-11-08 23:47:52 -0700523/**
524 * device_foreach_child_safe() - iterate through child devices safely
525 *
526 * This allows the @pos child to be removed in the loop if required.
527 *
528 * @pos: struct udevice * for the current device
529 * @next: struct udevice * for the next device
530 * @parent: parent device to scan
531 */
532#define device_foreach_child_safe(pos, next, parent) \
533 list_for_each_entry_safe(pos, next, &parent->child_head, sibling_node)
534
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900535/* device resource management */
536typedef void (*dr_release_t)(struct udevice *dev, void *res);
537typedef int (*dr_match_t)(struct udevice *dev, void *res, void *match_data);
538
Masahiro Yamadae2282d72015-07-25 21:52:37 +0900539#ifdef CONFIG_DEVRES
540
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900541#ifdef CONFIG_DEBUG_DEVRES
542void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
543 const char *name);
544#define _devres_alloc(release, size, gfp) \
545 __devres_alloc(release, size, gfp, #release)
546#else
547void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
548#endif
549
550/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600551 * devres_alloc() - Allocate device resource data
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900552 * @release: Release function devres will be associated with
553 * @size: Allocation size
554 * @gfp: Allocation flags
555 *
556 * Allocate devres of @size bytes. The allocated area is associated
557 * with @release. The returned pointer can be passed to
558 * other devres_*() functions.
559 *
560 * RETURNS:
561 * Pointer to allocated devres on success, NULL on failure.
562 */
563#define devres_alloc(release, size, gfp) \
564 _devres_alloc(release, size, gfp | __GFP_ZERO)
565
566/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600567 * devres_free() - Free device resource data
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900568 * @res: Pointer to devres data to free
569 *
570 * Free devres created with devres_alloc().
571 */
572void devres_free(void *res);
573
574/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600575 * devres_add() - Register device resource
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900576 * @dev: Device to add resource to
577 * @res: Resource to register
578 *
579 * Register devres @res to @dev. @res should have been allocated
580 * using devres_alloc(). On driver detach, the associated release
581 * function will be invoked and devres will be freed automatically.
582 */
583void devres_add(struct udevice *dev, void *res);
584
585/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600586 * devres_find() - Find device resource
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900587 * @dev: Device to lookup 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
591 *
592 * Find the latest devres of @dev which is associated with @release
593 * and for which @match returns 1. If @match is NULL, it's considered
594 * to match all.
595 *
Simon Glass93c7fe42015-09-28 23:32:04 -0600596 * @return pointer to found devres, NULL if not found.
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900597 */
598void *devres_find(struct udevice *dev, dr_release_t release,
599 dr_match_t match, void *match_data);
600
601/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600602 * devres_get() - Find devres, if non-existent, add one atomically
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900603 * @dev: Device to lookup or add devres for
604 * @new_res: Pointer to new initialized devres to add if not found
605 * @match: Match function (optional)
606 * @match_data: Data for the match function
607 *
608 * Find the latest devres of @dev which has the same release function
609 * as @new_res and for which @match return 1. If found, @new_res is
610 * freed; otherwise, @new_res is added atomically.
611 *
Simon Glass93c7fe42015-09-28 23:32:04 -0600612 * @return ointer to found or added devres.
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900613 */
614void *devres_get(struct udevice *dev, void *new_res,
615 dr_match_t match, void *match_data);
616
617/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600618 * devres_remove() - Find a device resource and remove it
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900619 * @dev: Device to find resource from
620 * @release: Look for resources associated with this release function
621 * @match: Match function (optional)
622 * @match_data: Data for the match function
623 *
624 * Find the latest devres of @dev associated with @release and for
625 * which @match returns 1. If @match is NULL, it's considered to
626 * match all. If found, the resource is removed atomically and
627 * returned.
628 *
Simon Glass93c7fe42015-09-28 23:32:04 -0600629 * @return ointer to removed devres on success, NULL if not found.
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900630 */
631void *devres_remove(struct udevice *dev, dr_release_t release,
632 dr_match_t match, void *match_data);
633
634/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600635 * devres_destroy() - Find a device resource and destroy it
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900636 * @dev: Device to find resource from
637 * @release: Look for resources associated with this release function
638 * @match: Match function (optional)
639 * @match_data: Data for the match function
640 *
641 * Find the latest devres of @dev associated with @release and for
642 * which @match returns 1. If @match is NULL, it's considered to
643 * match all. If found, the resource is removed atomically and freed.
644 *
645 * Note that the release function for the resource will not be called,
646 * only the devres-allocated data will be freed. The caller becomes
647 * responsible for freeing any other data.
648 *
Simon Glass93c7fe42015-09-28 23:32:04 -0600649 * @return 0 if devres is found and freed, -ENOENT if not found.
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900650 */
651int devres_destroy(struct udevice *dev, dr_release_t release,
652 dr_match_t match, void *match_data);
653
654/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600655 * devres_release() - Find a device resource and destroy it, calling release
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900656 * @dev: Device to find resource from
657 * @release: Look for resources associated with this release function
658 * @match: Match function (optional)
659 * @match_data: Data for the match function
660 *
661 * Find the latest devres of @dev associated with @release and for
662 * which @match returns 1. If @match is NULL, it's considered to
663 * match all. If found, the resource is removed atomically, the
664 * release function called and the resource freed.
665 *
Simon Glass93c7fe42015-09-28 23:32:04 -0600666 * @return 0 if devres is found and freed, -ENOENT if not found.
Masahiro Yamada608f26c2015-07-25 21:52:35 +0900667 */
668int devres_release(struct udevice *dev, dr_release_t release,
669 dr_match_t match, void *match_data);
670
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900671/* managed devm_k.alloc/kfree for device drivers */
672/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600673 * devm_kmalloc() - Resource-managed kmalloc
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900674 * @dev: Device to allocate memory for
675 * @size: Allocation size
676 * @gfp: Allocation gfp flags
677 *
678 * Managed kmalloc. Memory allocated with this function is
679 * automatically freed on driver detach. Like all other devres
680 * resources, guaranteed alignment is unsigned long long.
681 *
Simon Glass93c7fe42015-09-28 23:32:04 -0600682 * @return pointer to allocated memory on success, NULL on failure.
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900683 */
684void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp);
685static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
686{
687 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
688}
689static inline void *devm_kmalloc_array(struct udevice *dev,
690 size_t n, size_t size, gfp_t flags)
691{
692 if (size != 0 && n > SIZE_MAX / size)
693 return NULL;
694 return devm_kmalloc(dev, n * size, flags);
695}
696static inline void *devm_kcalloc(struct udevice *dev,
697 size_t n, size_t size, gfp_t flags)
698{
699 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
700}
701
702/**
Simon Glass93c7fe42015-09-28 23:32:04 -0600703 * devm_kfree() - Resource-managed kfree
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900704 * @dev: Device this memory belongs to
Simon Glass93c7fe42015-09-28 23:32:04 -0600705 * @ptr: Memory to free
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900706 *
707 * Free memory allocated with devm_kmalloc().
708 */
Simon Glass93c7fe42015-09-28 23:32:04 -0600709void devm_kfree(struct udevice *dev, void *ptr);
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900710
Masahiro Yamadae2282d72015-07-25 21:52:37 +0900711#else /* ! CONFIG_DEVRES */
712
713static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
714{
715 return kzalloc(size, gfp);
716}
717
718static inline void devres_free(void *res)
719{
720 kfree(res);
721}
722
723static inline void devres_add(struct udevice *dev, void *res)
724{
725}
726
727static inline void *devres_find(struct udevice *dev, dr_release_t release,
728 dr_match_t match, void *match_data)
729{
730 return NULL;
731}
732
733static inline void *devres_get(struct udevice *dev, void *new_res,
734 dr_match_t match, void *match_data)
735{
736 return NULL;
737}
738
739static inline void *devres_remove(struct udevice *dev, dr_release_t release,
740 dr_match_t match, void *match_data)
741{
742 return NULL;
743}
744
745static inline int devres_destroy(struct udevice *dev, dr_release_t release,
746 dr_match_t match, void *match_data)
747{
748 return 0;
749}
750
751static inline int devres_release(struct udevice *dev, dr_release_t release,
752 dr_match_t match, void *match_data)
753{
754 return 0;
755}
756
757static inline void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
758{
759 return kmalloc(size, gfp);
760}
761
762static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
763{
764 return kzalloc(size, gfp);
765}
766
767static inline void *devm_kmaloc_array(struct udevice *dev,
768 size_t n, size_t size, gfp_t flags)
769{
770 /* TODO: add kmalloc_array() to linux/compat.h */
771 if (size != 0 && n > SIZE_MAX / size)
772 return NULL;
773 return kmalloc(n * size, flags);
774}
775
776static inline void *devm_kcalloc(struct udevice *dev,
777 size_t n, size_t size, gfp_t flags)
778{
779 /* TODO: add kcalloc() to linux/compat.h */
780 return kmalloc(n * size, flags | __GFP_ZERO);
781}
782
Simon Glass93c7fe42015-09-28 23:32:04 -0600783static inline void devm_kfree(struct udevice *dev, void *ptr)
Masahiro Yamadae2282d72015-07-25 21:52:37 +0900784{
Simon Glass93c7fe42015-09-28 23:32:04 -0600785 kfree(ptr);
Masahiro Yamadae2282d72015-07-25 21:52:37 +0900786}
787
788#endif /* ! CONFIG_DEVRES */
Masahiro Yamada2b07f682015-07-25 21:52:36 +0900789
Stefan Roese66eaea62015-12-14 16:18:15 +0100790/**
791 * dm_set_translation_offset() - Set translation offset
792 * @offs: Translation offset
793 *
794 * Some platforms need a special address translation. Those
795 * platforms (e.g. mvebu in SPL) can configure a translation
796 * offset in the DM by calling this function. It will be
797 * added to all addresses returned in dev_get_addr().
798 */
799void dm_set_translation_offset(fdt_addr_t offs);
800
801/**
802 * dm_get_translation_offset() - Get translation offset
803 *
804 * This function returns the translation offset that can
805 * be configured by calling dm_set_translation_offset().
806 *
807 * @return translation offset for the device address (0 as default).
808 */
809fdt_addr_t dm_get_translation_offset(void);
810
Simon Glass6494d702014-02-26 15:59:18 -0700811#endif