Merge tag 'xilinx-for-v2020.01' of https://gitlab.denx.de/u-boot/custodians/u-boot...
[platform/kernel/u-boot.git] / drivers / core / lists.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2013 Google, Inc
4  *
5  * (C) Copyright 2012
6  * Marek Vasut <marex@denx.de>
7  */
8
9 #define LOG_CATEGORY LOGC_DM
10
11 #include <common.h>
12 #include <errno.h>
13 #include <dm/device.h>
14 #include <dm/device-internal.h>
15 #include <dm/lists.h>
16 #include <dm/platdata.h>
17 #include <dm/uclass.h>
18 #include <dm/util.h>
19 #include <fdtdec.h>
20 #include <linux/compiler.h>
21
22 struct driver *lists_driver_lookup_name(const char *name)
23 {
24         struct driver *drv =
25                 ll_entry_start(struct driver, driver);
26         const int n_ents = ll_entry_count(struct driver, driver);
27         struct driver *entry;
28
29         for (entry = drv; entry != drv + n_ents; entry++) {
30                 if (!strcmp(name, entry->name))
31                         return entry;
32         }
33
34         /* Not found */
35         return NULL;
36 }
37
38 struct uclass_driver *lists_uclass_lookup(enum uclass_id id)
39 {
40         struct uclass_driver *uclass =
41                 ll_entry_start(struct uclass_driver, uclass);
42         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
43         struct uclass_driver *entry;
44
45         for (entry = uclass; entry != uclass + n_ents; entry++) {
46                 if (entry->id == id)
47                         return entry;
48         }
49
50         return NULL;
51 }
52
53 int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only)
54 {
55         struct driver_info *info =
56                 ll_entry_start(struct driver_info, driver_info);
57         const int n_ents = ll_entry_count(struct driver_info, driver_info);
58         struct driver_info *entry;
59         struct udevice *dev;
60         int result = 0;
61         int ret;
62
63         for (entry = info; entry != info + n_ents; entry++) {
64                 ret = device_bind_by_name(parent, pre_reloc_only, entry, &dev);
65                 if (ret && ret != -EPERM) {
66                         dm_warn("No match for driver '%s'\n", entry->name);
67                         if (!result || ret != -ENOENT)
68                                 result = ret;
69                 }
70         }
71
72         return result;
73 }
74
75 int device_bind_driver(struct udevice *parent, const char *drv_name,
76                        const char *dev_name, struct udevice **devp)
77 {
78         return device_bind_driver_to_node(parent, drv_name, dev_name,
79                                           ofnode_null(), devp);
80 }
81
82 int device_bind_driver_to_node(struct udevice *parent, const char *drv_name,
83                                const char *dev_name, ofnode node,
84                                struct udevice **devp)
85 {
86         struct driver *drv;
87         int ret;
88
89         drv = lists_driver_lookup_name(drv_name);
90         if (!drv) {
91                 debug("Cannot find driver '%s'\n", drv_name);
92                 return -ENOENT;
93         }
94         ret = device_bind_with_driver_data(parent, drv, dev_name, 0 /* data */,
95                                            node, devp);
96
97         return ret;
98 }
99
100 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
101 /**
102  * driver_check_compatible() - Check if a driver matches a compatible string
103  *
104  * @param of_match:     List of compatible strings to match
105  * @param of_idp:       Returns the match that was found
106  * @param compat:       The compatible string to search for
107  * @return 0 if there is a match, -ENOENT if no match
108  */
109 static int driver_check_compatible(const struct udevice_id *of_match,
110                                    const struct udevice_id **of_idp,
111                                    const char *compat)
112 {
113         if (!of_match)
114                 return -ENOENT;
115
116         while (of_match->compatible) {
117                 if (!strcmp(of_match->compatible, compat)) {
118                         *of_idp = of_match;
119                         return 0;
120                 }
121                 of_match++;
122         }
123
124         return -ENOENT;
125 }
126
127 int lists_bind_fdt(struct udevice *parent, ofnode node, struct udevice **devp,
128                    bool pre_reloc_only)
129 {
130         struct driver *driver = ll_entry_start(struct driver, driver);
131         const int n_ents = ll_entry_count(struct driver, driver);
132         const struct udevice_id *id;
133         struct driver *entry;
134         struct udevice *dev;
135         bool found = false;
136         const char *name, *compat_list, *compat;
137         int compat_length, i;
138         int result = 0;
139         int ret = 0;
140
141         if (devp)
142                 *devp = NULL;
143         name = ofnode_get_name(node);
144         log_debug("bind node %s\n", name);
145
146         compat_list = ofnode_get_property(node, "compatible", &compat_length);
147         if (!compat_list) {
148                 if (compat_length == -FDT_ERR_NOTFOUND) {
149                         log_debug("Device '%s' has no compatible string\n",
150                                   name);
151                         return 0;
152                 }
153
154                 dm_warn("Device tree error at node '%s'\n", name);
155                 return compat_length;
156         }
157
158         /*
159          * Walk through the compatible string list, attempting to match each
160          * compatible string in order such that we match in order of priority
161          * from the first string to the last.
162          */
163         for (i = 0; i < compat_length; i += strlen(compat) + 1) {
164                 compat = compat_list + i;
165                 log_debug("   - attempt to match compatible string '%s'\n",
166                           compat);
167
168                 for (entry = driver; entry != driver + n_ents; entry++) {
169                         ret = driver_check_compatible(entry->of_match, &id,
170                                                       compat);
171                         if (!ret)
172                                 break;
173                 }
174                 if (entry == driver + n_ents)
175                         continue;
176
177                 if (pre_reloc_only) {
178                         if (!dm_ofnode_pre_reloc(node) &&
179                             !(entry->flags & DM_FLAG_PRE_RELOC))
180                                 return 0;
181                 }
182
183                 log_debug("   - found match at '%s': '%s' matches '%s'\n",
184                           entry->name, entry->of_match->compatible,
185                           id->compatible);
186                 ret = device_bind_with_driver_data(parent, entry, name,
187                                                    id->data, node, &dev);
188                 if (ret == -ENODEV) {
189                         log_debug("Driver '%s' refuses to bind\n", entry->name);
190                         continue;
191                 }
192                 if (ret) {
193                         dm_warn("Error binding driver '%s': %d\n", entry->name,
194                                 ret);
195                         return ret;
196                 } else {
197                         found = true;
198                         if (devp)
199                                 *devp = dev;
200                 }
201                 break;
202         }
203
204         if (!found && !result && ret != -ENODEV)
205                 log_debug("No match for node '%s'\n", name);
206
207         return result;
208 }
209 #endif