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Simon Glassdd6ab882014-02-26 15:59:18 -07001/*
2 * Copyright (c) 2013 Google, Inc
3 *
4 * (C) Copyright 2012
5 * Pavel Herrmann <morpheus.ibis@gmail.com>
6 *
7 * SPDX-License-Identifier: GPL-2.0+
8 */
9
10#ifndef _DM_UCLASS_H
11#define _DM_UCLASS_H
12
13#include <dm/uclass-id.h>
Masahiro Yamada63b3a8f2014-10-07 14:49:13 +090014#include <linker_lists.h>
Simon Glassdd6ab882014-02-26 15:59:18 -070015#include <linux/list.h>
16
17/**
18 * struct uclass - a U-Boot drive class, collecting together similar drivers
19 *
20 * A uclass provides an interface to a particular function, which is
21 * implemented by one or more drivers. Every driver belongs to a uclass even
22 * if it is the only driver in that uclass. An example uclass is GPIO, which
23 * provides the ability to change read inputs, set and clear outputs, etc.
24 * There may be drivers for on-chip SoC GPIO banks, I2C GPIO expanders and
25 * PMIC IO lines, all made available in a unified way through the uclass.
26 *
27 * @priv: Private data for this uclass
28 * @uc_drv: The driver for the uclass itself, not to be confused with a
29 * 'struct driver'
Simon Glass4dbb5cf2014-06-11 23:29:54 -060030 * @dev_head: List of devices in this uclass (devices are attached to their
Simon Glassdd6ab882014-02-26 15:59:18 -070031 * uclass when their bind method is called)
32 * @sibling_node: Next uclass in the linked list of uclasses
33 */
34struct uclass {
35 void *priv;
36 struct uclass_driver *uc_drv;
37 struct list_head dev_head;
38 struct list_head sibling_node;
39};
40
Heiko Schocherb74fcb42014-05-22 12:43:05 +020041struct udevice;
Simon Glassdd6ab882014-02-26 15:59:18 -070042
Simon Glass0ccb0972015-01-25 08:27:05 -070043/* Members of this uclass sequence themselves with aliases */
44#define DM_UC_FLAG_SEQ_ALIAS (1 << 0)
45
Simon Glassdd6ab882014-02-26 15:59:18 -070046/**
47 * struct uclass_driver - Driver for the uclass
48 *
49 * A uclass_driver provides a consistent interface to a set of related
50 * drivers.
51 *
52 * @name: Name of uclass driver
53 * @id: ID number of this uclass
54 * @post_bind: Called after a new device is bound to this uclass
55 * @pre_unbind: Called before a device is unbound from this uclass
Simon Glass9c1f3822015-03-05 12:25:22 -070056 * @pre_probe: Called before a new device is probed
Simon Glassdd6ab882014-02-26 15:59:18 -070057 * @post_probe: Called after a new device is probed
58 * @pre_remove: Called before a device is removed
Simon Glassf4c9b3e2015-01-25 08:27:08 -070059 * @child_post_bind: Called after a child is bound to a device in this uclass
Simon Glassdd6ab882014-02-26 15:59:18 -070060 * @init: Called to set up the uclass
61 * @destroy: Called to destroy the uclass
62 * @priv_auto_alloc_size: If non-zero this is the size of the private data
63 * to be allocated in the uclass's ->priv pointer. If zero, then the uclass
64 * driver is responsible for allocating any data required.
65 * @per_device_auto_alloc_size: Each device can hold private data owned
66 * by the uclass. If required this will be automatically allocated if this
67 * value is non-zero.
Przemyslaw Marczakd850e672015-04-15 13:07:18 +020068 * @per_device_platdata_auto_alloc_size: Each device can hold platform data
69 * owned by the uclass as 'dev->uclass_platdata'. If the value is non-zero,
70 * then this will be automatically allocated.
Simon Glassc23b4282015-01-25 08:27:06 -070071 * @per_child_auto_alloc_size: Each child device (of a parent in this
72 * uclass) can hold parent data for the device/uclass. This value is only
73 * used as a falback if this member is 0 in the driver.
Simon Glass57f95402015-01-25 08:27:02 -070074 * @per_child_platdata_auto_alloc_size: A bus likes to store information about
75 * its children. If non-zero this is the size of this data, to be allocated
76 * in the child device's parent_platdata pointer. This value is only used as
77 * a falback if this member is 0 in the driver.
Simon Glassdd6ab882014-02-26 15:59:18 -070078 * @ops: Uclass operations, providing the consistent interface to devices
79 * within the uclass.
Simon Glass0ccb0972015-01-25 08:27:05 -070080 * @flags: Flags for this uclass (DM_UC_...)
Simon Glassdd6ab882014-02-26 15:59:18 -070081 */
82struct uclass_driver {
83 const char *name;
84 enum uclass_id id;
Heiko Schocherb74fcb42014-05-22 12:43:05 +020085 int (*post_bind)(struct udevice *dev);
86 int (*pre_unbind)(struct udevice *dev);
Simon Glass9c1f3822015-03-05 12:25:22 -070087 int (*pre_probe)(struct udevice *dev);
Heiko Schocherb74fcb42014-05-22 12:43:05 +020088 int (*post_probe)(struct udevice *dev);
89 int (*pre_remove)(struct udevice *dev);
Simon Glassf4c9b3e2015-01-25 08:27:08 -070090 int (*child_post_bind)(struct udevice *dev);
Simon Glass5104b982015-01-25 08:27:10 -070091 int (*child_pre_probe)(struct udevice *dev);
Simon Glassdd6ab882014-02-26 15:59:18 -070092 int (*init)(struct uclass *class);
93 int (*destroy)(struct uclass *class);
94 int priv_auto_alloc_size;
95 int per_device_auto_alloc_size;
Przemyslaw Marczakd850e672015-04-15 13:07:18 +020096 int per_device_platdata_auto_alloc_size;
Simon Glassc23b4282015-01-25 08:27:06 -070097 int per_child_auto_alloc_size;
Simon Glass57f95402015-01-25 08:27:02 -070098 int per_child_platdata_auto_alloc_size;
Simon Glassdd6ab882014-02-26 15:59:18 -070099 const void *ops;
Simon Glass0ccb0972015-01-25 08:27:05 -0700100 uint32_t flags;
Simon Glassdd6ab882014-02-26 15:59:18 -0700101};
102
103/* Declare a new uclass_driver */
104#define UCLASS_DRIVER(__name) \
105 ll_entry_declare(struct uclass_driver, __name, uclass)
106
107/**
108 * uclass_get() - Get a uclass based on an ID, creating it if needed
109 *
110 * Every uclass is identified by an ID, a number from 0 to n-1 where n is
111 * the number of uclasses. This function allows looking up a uclass by its
112 * ID.
113 *
114 * @key: ID to look up
115 * @ucp: Returns pointer to uclass (there is only one per ID)
116 * @return 0 if OK, -ve on error
117 */
118int uclass_get(enum uclass_id key, struct uclass **ucp);
119
120/**
121 * uclass_get_device() - Get a uclass device based on an ID and index
122 *
Simon Glass4dbb5cf2014-06-11 23:29:54 -0600123 * The device is probed to activate it ready for use.
124 *
Simon Glasscebcebb2014-07-23 06:55:17 -0600125 * @id: ID to look up
Simon Glassdd6ab882014-02-26 15:59:18 -0700126 * @index: Device number within that uclass (0=first)
Simon Glass4dbb5cf2014-06-11 23:29:54 -0600127 * @devp: Returns pointer to device (there is only one per for each ID)
Simon Glassdd6ab882014-02-26 15:59:18 -0700128 * @return 0 if OK, -ve on error
129 */
Simon Glass4dbb5cf2014-06-11 23:29:54 -0600130int uclass_get_device(enum uclass_id id, int index, struct udevice **devp);
Simon Glassdd6ab882014-02-26 15:59:18 -0700131
132/**
Przemyslaw Marczaka12a1f52015-04-15 13:07:23 +0200133 * uclass_get_device_by_name() - Get a uclass device by it's name
134 *
Przemyslaw Marczakc9177722015-04-20 13:32:34 +0200135 * This searches the devices in the uclass for one with the exactly given name.
Przemyslaw Marczaka12a1f52015-04-15 13:07:23 +0200136 *
137 * The device is probed to activate it ready for use.
138 *
139 * @id: ID to look up
140 * @name: name of a device to get
141 * @devp: Returns pointer to device (the first one with the name)
142 * @return 0 if OK, -ve on error
143 */
144int uclass_get_device_by_name(enum uclass_id id, const char *name,
145 struct udevice **devp);
146
147/**
Simon Glassdb6f0202014-07-23 06:55:12 -0600148 * uclass_get_device_by_seq() - Get a uclass device based on an ID and sequence
149 *
150 * If an active device has this sequence it will be returned. If there is no
151 * such device then this will check for a device that is requesting this
152 * sequence.
153 *
154 * The device is probed to activate it ready for use.
155 *
156 * @id: ID to look up
157 * @seq: Sequence number to find (0=first)
158 * @devp: Returns pointer to device (there is only one for each seq)
159 * @return 0 if OK, -ve on error
160 */
161int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp);
162
163/**
Simon Glassc1464ab2014-07-23 06:55:14 -0600164 * uclass_get_device_by_of_offset() - Get a uclass device by device tree node
165 *
166 * This searches the devices in the uclass for one attached to the given
167 * device tree node.
168 *
169 * The device is probed to activate it ready for use.
170 *
171 * @id: ID to look up
172 * @node: Device tree offset to search for (if -ve then -ENODEV is returned)
173 * @devp: Returns pointer to device (there is only one for each node)
174 * @return 0 if OK, -ve on error
175 */
176int uclass_get_device_by_of_offset(enum uclass_id id, int node,
177 struct udevice **devp);
178
179/**
Simon Glassdd6ab882014-02-26 15:59:18 -0700180 * uclass_first_device() - Get the first device in a uclass
181 *
Simon Glass8f5251d2015-01-25 08:26:57 -0700182 * The device returned is probed if necessary, and ready for use
183 *
Simon Glassdd6ab882014-02-26 15:59:18 -0700184 * @id: Uclass ID to look up
185 * @devp: Returns pointer to the first device in that uclass, or NULL if none
186 * @return 0 if OK (found or not found), -1 on error
187 */
Heiko Schocherb74fcb42014-05-22 12:43:05 +0200188int uclass_first_device(enum uclass_id id, struct udevice **devp);
Simon Glassdd6ab882014-02-26 15:59:18 -0700189
190/**
191 * uclass_next_device() - Get the next device in a uclass
192 *
Simon Glass8f5251d2015-01-25 08:26:57 -0700193 * The device returned is probed if necessary, and ready for use
194 *
Simon Glassdd6ab882014-02-26 15:59:18 -0700195 * @devp: On entry, pointer to device to lookup. On exit, returns pointer
196 * to the next device in the same uclass, or NULL if none
197 * @return 0 if OK (found or not found), -1 on error
198 */
Heiko Schocherb74fcb42014-05-22 12:43:05 +0200199int uclass_next_device(struct udevice **devp);
Simon Glassdd6ab882014-02-26 15:59:18 -0700200
201/**
Simon Glassdb6f0202014-07-23 06:55:12 -0600202 * uclass_resolve_seq() - Resolve a device's sequence number
203 *
204 * On entry dev->seq is -1, and dev->req_seq may be -1 (to allocate a
205 * sequence number automatically, or >= 0 to select a particular number.
206 * If the requested sequence number is in use, then this device will
207 * be allocated another one.
208 *
209 * Note that the device's seq value is not changed by this function.
210 *
211 * @dev: Device for which to allocate sequence number
212 * @return sequence number allocated, or -ve on error
213 */
214int uclass_resolve_seq(struct udevice *dev);
215
216/**
Simon Glassdd6ab882014-02-26 15:59:18 -0700217 * uclass_foreach_dev() - Helper function to iteration through devices
218 *
219 * This creates a for() loop which works through the available devices in
220 * a uclass in order from start to end.
221 *
Heiko Schocherb74fcb42014-05-22 12:43:05 +0200222 * @pos: struct udevice * to hold the current device. Set to NULL when there
Simon Glassdd6ab882014-02-26 15:59:18 -0700223 * are no more devices.
Simon Glass4dbb5cf2014-06-11 23:29:54 -0600224 * @uc: uclass to scan
Simon Glassdd6ab882014-02-26 15:59:18 -0700225 */
226#define uclass_foreach_dev(pos, uc) \
227 for (pos = list_entry((&(uc)->dev_head)->next, typeof(*pos), \
228 uclass_node); \
229 prefetch(pos->uclass_node.next), \
230 &pos->uclass_node != (&(uc)->dev_head); \
231 pos = list_entry(pos->uclass_node.next, typeof(*pos), \
232 uclass_node))
233
234#endif