1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 * Marek Vasut <marex@denx.de>
10 #ifndef _DM_DEVICE_INTERNAL_H
11 #define _DM_DEVICE_INTERNAL_H
13 #include <linker_lists.h>
14 #include <dm/ofnode.h>
20 * These two macros DM_DEVICE_INST and DM_DEVICE_REF are only allowed in code
21 * generated by dtoc, because the ordering is important and if other instances
22 * creep in then they may mess up the ordering expected by dtoc.
24 * It is OK to use them with 'extern' though, since that does not actually
25 * add a new record to the linker_list.
29 * DM_DEVICE_INST() - Declare a bound device ready for run-time use
31 * This adds an actual struct udevice to a list which is found by driver model
36 * extern U_BOOT_DRIVER(sandbox_fixed_clock);
37 * extern DM_UCLASS_INST(clk);
39 * DM_DEVICE_INST(clk_fixed) = {
40 * .driver = DM_DRIVER_REF(sandbox_fixed_clock),
41 * .name = "sandbox_fixed_clock",
42 * .plat_ = &_sandbox_fixed_clock_plat_clk_fixed,
43 * .uclass = DM_UCLASS_REF(clk),
48 * @_name: Name of the udevice. This must be a valid C identifier, used by the
51 #define DM_DEVICE_INST(_name) \
52 ll_entry_declare(struct udevice, _name, udevice)
55 * DM_DEVICE_REF() - Get a reference to a device
57 * This is useful in data structures and code for referencing a udevice at
58 * build time. Before this is used, an extern DM_DEVICE_INST() must have been
63 * extern DM_DEVICE_INST(clk_fixed);
65 * struct udevice *devs[] = {
66 * DM_DEVICE_REF(clk_fixed),
69 * @_name: Name of the udevice. This must be a valid C identifier, used by the
71 * @returns struct udevice * for the device
73 #define DM_DEVICE_REF(_name) \
74 ll_entry_ref(struct udevice, _name, udevice)
77 * DM_DEVICE_GET() - Get a pointer to a given device
79 * This is similar to DM_DEVICE_REF() except that it does not need the extern
80 * declaration before it. However it cannot be used in a data structures, only
81 * in code within a function.
85 * void some_function() {
86 * struct udevice *dev = DM_DEVICE_GET(clk_fixed);
90 #define DM_DEVICE_GET(__name) \
91 ll_entry_get(struct udevice, __name, udevice)
94 * device_bind() - Create a device and bind it to a driver
96 * Called to set up a new device attached to a driver. The device will either
97 * have plat, or a device tree node which can be used to create the
100 * Once bound a device exists but is not yet active until device_probe() is
103 * @parent: Pointer to device's parent, under which this driver will exist
104 * @drv: Device's driver
105 * @name: Name of device (e.g. device tree node name)
106 * @plat: Pointer to data for this device - the structure is device-
107 * specific but may include the device's I/O address, etc.. This is NULL for
108 * devices which use device tree.
109 * @ofnode: Devicetree node for this device. This is ofnode_null() for
110 * devices which don't use devicetree or don't have a node.
111 * @devp: if non-NULL, returns a pointer to the bound device
112 * @return 0 if OK, -ve on error
114 int device_bind(struct udevice *parent, const struct driver *drv,
115 const char *name, void *plat, ofnode node,
116 struct udevice **devp);
119 * device_bind_with_driver_data() - Create a device and bind it to a driver
121 * Called to set up a new device attached to a driver, in the case where the
122 * driver was matched to the device by means of a match table that provides
125 * Once bound a device exists but is not yet active until device_probe() is
128 * @parent: Pointer to device's parent, under which this driver will exist
129 * @drv: Device's driver
130 * @name: Name of device (e.g. device tree node name)
131 * @driver_data: The driver_data field from the driver's match table.
132 * @node: Device tree node for this device. This is invalid for devices which
133 * don't use device tree.
134 * @devp: if non-NULL, returns a pointer to the bound device
135 * @return 0 if OK, -ve on error
137 int device_bind_with_driver_data(struct udevice *parent,
138 const struct driver *drv, const char *name,
139 ulong driver_data, ofnode node,
140 struct udevice **devp);
142 * device_bind_by_name: Create a device and bind it to a driver
144 * This is a helper function used to bind devices which do not use device
147 * @parent: Pointer to device's parent
148 * @pre_reloc_only: If true, bind the driver only if its DM_FLAG_PRE_RELOC flag
149 * is set. If false bind the driver always.
150 * @info: Name and plat for this device
151 * @devp: if non-NULL, returns a pointer to the bound device
152 * @return 0 if OK, -ve on error
154 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
155 const struct driver_info *info, struct udevice **devp);
158 * device_reparent: reparent the device to a new parent
160 * @dev: pointer to device to be reparented
161 * @new_parent: pointer to new parent device
162 * @return 0 if OK, -ve on error
164 int device_reparent(struct udevice *dev, struct udevice *new_parent);
167 * device_of_to_plat() - Read platform data for a device
169 * Read platform data for a device (typically from the device tree) so that
170 * the information needed to probe the device is present.
172 * This may cause some others devices to be probed if this one depends on them,
173 * e.g. a GPIO line will cause a GPIO device to be probed.
175 * All private data associated with the device is allocated.
177 * @dev: Pointer to device to process
178 * @return 0 if OK, -ve on error
180 int device_of_to_plat(struct udevice *dev);
183 * device_probe() - Probe a device, activating it
185 * Activate a device so that it is ready for use. All its parents are probed
188 * @dev: Pointer to device to probe
189 * @return 0 if OK, -ve on error
191 int device_probe(struct udevice *dev);
194 * device_remove() - Remove a device, de-activating it
196 * De-activate a device so that it is no longer ready for use. All its
197 * children are deactivated first.
199 * @dev: Pointer to device to remove
200 * @flags: Flags for selective device removal (DM_REMOVE_...)
201 * @return 0 if OK, -EKEYREJECTED if not removed due to flags, -EPROBE_DEFER if
202 * this is a vital device and flags is DM_REMOVE_NON_VITAL, other -ve on
203 * error (such an error here is normally a very bad thing)
205 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
206 int device_remove(struct udevice *dev, uint flags);
208 static inline int device_remove(struct udevice *dev, uint flags) { return 0; }
212 * device_unbind() - Unbind a device, destroying it
214 * Unbind a device and remove all memory used by it
216 * @dev: Pointer to device to unbind
217 * @return 0 if OK, -ve on error
219 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
220 int device_unbind(struct udevice *dev);
222 static inline int device_unbind(struct udevice *dev) { return 0; }
225 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
226 void device_free(struct udevice *dev);
228 static inline void device_free(struct udevice *dev) {}
232 * device_chld_unbind() - Unbind all device's children from the device if bound
235 * On error, the function continues to unbind all children, and reports the
238 * @dev: The device that is to be stripped of its children
239 * @drv: The targeted driver
240 * @return 0 on success, -ve on error
242 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
243 int device_chld_unbind(struct udevice *dev, struct driver *drv);
245 static inline int device_chld_unbind(struct udevice *dev, struct driver *drv)
252 * device_chld_remove() - Stop all device's children
254 * This continues through all children recursively stopping part-way through if
255 * an error occurs. Return values of -EKEYREJECTED are ignored and processing
256 * continues, since they just indicate that the child did not elect to be
257 * removed based on the value of @flags. Return values of -EPROBE_DEFER cause
258 * processing of other children to continue, but the function will return
261 * @dev: The device whose children are to be removed
262 * @drv: The targeted driver
263 * @flags: Flag, if this functions is called in the pre-OS stage
264 * @return 0 on success, -EPROBE_DEFER if any child failed to remove, other
267 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
268 int device_chld_remove(struct udevice *dev, struct driver *drv,
271 static inline int device_chld_remove(struct udevice *dev, struct driver *drv,
279 * dev_set_priv() - Set the private data for a device
281 * This is normally handled by driver model, which automatically allocates
282 * private data when an 'auto' size if provided by the driver.
284 * Use this function to override normal operation for special situations, such
285 * as needing to allocate a variable amount of data.
287 * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
288 * model code, since the pointer must be within the gd->dm_priv_base region.
290 * @dev Device to check
291 * @priv New private-data pointer
293 void dev_set_priv(struct udevice *dev, void *priv);
296 * dev_set_parent_priv() - Set the parent-private data for a device
298 * This is normally handled by driver model, which automatically allocates
299 * parent-private data when an 'auto' size if provided by the driver.
301 * Use this function to override normal operation for special situations, such
302 * as needing to allocate a variable amount of data.
304 * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
305 * model code, since the pointer must be within the gd->dm_priv_base region.
307 * @dev: Device to update
308 * @parent_priv: New parent-private data
310 void dev_set_parent_priv(struct udevice *dev, void *parent_priv);
313 * dev_set_uclass_priv() - Set the uclass private data for a device
315 * This is normally handled by driver model, which automatically allocates
316 * uclass-private data when an 'auto' size if provided by the driver.
318 * Use this function to override normal operation for special situations, such
319 * as needing to allocate a variable amount of data.
321 * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
322 * model code, since the pointer must be within the gd->dm_priv_base region.
324 * @dev: Device to update
325 * @uclass_priv: New uclass private data
327 void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv);
330 * dev_set_plat() - Set the platform data for a device
332 * This is normally handled by driver model, which automatically allocates
333 * platform data when an 'auto' size if provided by the driver.
335 * Use this function to override normal operation for special situations, such
336 * as needing to allocate a variable amount of data.
338 * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
339 * model code, since the pointer must be within the gd->dm_priv_base region.
341 * @dev Device to check
342 * @plat New platform-data pointer
344 void dev_set_plat(struct udevice *dev, void *priv);
347 * dev_set_parent_plat() - Set the parent platform data for a device
349 * This is normally handled by driver model, which automatically allocates
350 * parent platform data when an 'auto' size if provided by the driver.
352 * Use this function to override normal operation for special situations, such
353 * as needing to allocate a variable amount of data.
355 * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
356 * model code, since the pointer must be within the gd->dm_priv_base region.
358 * @dev: Device to update
359 * @parent_plat: New parent platform data
361 void dev_set_parent_plat(struct udevice *dev, void *parent_plat);
364 * dev_set_uclass_plat() - Set the uclass platform data for a device
366 * This is normally handled by driver model, which automatically allocates
367 * uclass platform data when an 'auto' size if provided by the driver.
369 * Use this function to override normal operation for special situations, such
370 * as needing to allocate a variable amount of data.
372 * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
373 * model code, since the pointer must be within the gd->dm_priv_base region.
375 * @dev: Device to update
376 * @uclass_plat: New uclass platform data
378 void dev_set_uclass_plat(struct udevice *dev, void *uclass_plat);
381 * simple_bus_translate() - translate a bus address to a system address
383 * This handles the 'ranges' property in a simple bus. It translates the
384 * device address @addr to a system address using this property.
386 * @dev: Simple bus device (parent of target device)
387 * @addr: Address to translate
388 * @return new address
390 fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr);
392 /* Cast away any volatile pointer */
393 #define DM_ROOT_NON_CONST (((gd_t *)gd)->dm_root)
394 #define DM_UCLASS_ROOT_NON_CONST (((gd_t *)gd)->uclass_root)
395 #define DM_UCLASS_ROOT_S_NON_CONST (((gd_t *)gd)->uclass_root_s)
397 /* device resource management */
401 * devres_release_probe - Release managed resources allocated after probing
402 * @dev: Device to release resources for
404 * Release all resources allocated for @dev when it was probed or later.
405 * This function is called on driver removal.
407 void devres_release_probe(struct udevice *dev);
410 * devres_release_all - Release all managed resources
411 * @dev: Device to release resources for
413 * Release all resources associated with @dev. This function is
414 * called on driver unbinding.
416 void devres_release_all(struct udevice *dev);
418 #else /* ! CONFIG_DEVRES */
420 static inline void devres_release_probe(struct udevice *dev)
424 static inline void devres_release_all(struct udevice *dev)
428 #endif /* ! CONFIG_DEVRES */