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7eebde70 BH |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version | |
8 | * 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | */ | |
11 | ||
12 | #undef DEBUG | |
13 | ||
14 | #include <linux/string.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/mod_devicetable.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #include <asm/errno.h> | |
22 | #include <asm/dcr.h> | |
23 | #include <asm/of_device.h> | |
24 | #include <asm/of_platform.h> | |
25 | ||
26 | ||
27 | /* | |
28 | * The list of OF IDs below is used for matching bus types in the | |
29 | * system whose devices are to be exposed as of_platform_devices. | |
30 | * | |
31 | * This is the default list valid for most platforms. This file provides | |
32 | * functions who can take an explicit list if necessary though | |
33 | * | |
34 | * The search is always performed recursively looking for children of | |
35 | * the provided device_node and recursively if such a children matches | |
36 | * a bus type in the list | |
37 | */ | |
38 | ||
39 | static struct of_device_id of_default_bus_ids[] = { | |
40 | { .type = "soc", }, | |
41 | { .compatible = "soc", }, | |
42 | { .type = "spider", }, | |
43 | { .type = "axon", }, | |
44 | { .type = "plb5", }, | |
45 | { .type = "plb4", }, | |
46 | { .type = "opb", }, | |
47 | {}, | |
48 | }; | |
49 | ||
50 | /* | |
51 | * | |
52 | * OF platform device type definition & base infrastructure | |
53 | * | |
54 | */ | |
55 | ||
56 | static int of_platform_bus_match(struct device *dev, struct device_driver *drv) | |
57 | { | |
58 | struct of_device * of_dev = to_of_device(dev); | |
59 | struct of_platform_driver * of_drv = to_of_platform_driver(drv); | |
60 | const struct of_device_id * matches = of_drv->match_table; | |
61 | ||
62 | if (!matches) | |
63 | return 0; | |
64 | ||
65 | return of_match_device(matches, of_dev) != NULL; | |
66 | } | |
67 | ||
68 | static int of_platform_device_probe(struct device *dev) | |
69 | { | |
70 | int error = -ENODEV; | |
71 | struct of_platform_driver *drv; | |
72 | struct of_device *of_dev; | |
73 | const struct of_device_id *match; | |
74 | ||
75 | drv = to_of_platform_driver(dev->driver); | |
76 | of_dev = to_of_device(dev); | |
77 | ||
78 | if (!drv->probe) | |
79 | return error; | |
80 | ||
81 | of_dev_get(of_dev); | |
82 | ||
83 | match = of_match_device(drv->match_table, of_dev); | |
84 | if (match) | |
85 | error = drv->probe(of_dev, match); | |
86 | if (error) | |
87 | of_dev_put(of_dev); | |
88 | ||
89 | return error; | |
90 | } | |
91 | ||
92 | static int of_platform_device_remove(struct device *dev) | |
93 | { | |
94 | struct of_device * of_dev = to_of_device(dev); | |
95 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
96 | ||
97 | if (dev->driver && drv->remove) | |
98 | drv->remove(of_dev); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int of_platform_device_suspend(struct device *dev, pm_message_t state) | |
103 | { | |
104 | struct of_device * of_dev = to_of_device(dev); | |
105 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
106 | int error = 0; | |
107 | ||
108 | if (dev->driver && drv->suspend) | |
109 | error = drv->suspend(of_dev, state); | |
110 | return error; | |
111 | } | |
112 | ||
113 | static int of_platform_device_resume(struct device * dev) | |
114 | { | |
115 | struct of_device * of_dev = to_of_device(dev); | |
116 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
117 | int error = 0; | |
118 | ||
119 | if (dev->driver && drv->resume) | |
120 | error = drv->resume(of_dev); | |
121 | return error; | |
122 | } | |
123 | ||
124 | struct bus_type of_platform_bus_type = { | |
125 | .name = "of_platform", | |
126 | .match = of_platform_bus_match, | |
127 | .probe = of_platform_device_probe, | |
128 | .remove = of_platform_device_remove, | |
129 | .suspend = of_platform_device_suspend, | |
130 | .resume = of_platform_device_resume, | |
131 | }; | |
132 | EXPORT_SYMBOL(of_platform_bus_type); | |
133 | ||
134 | static int __init of_bus_driver_init(void) | |
135 | { | |
136 | return bus_register(&of_platform_bus_type); | |
137 | } | |
138 | ||
139 | postcore_initcall(of_bus_driver_init); | |
140 | ||
141 | int of_register_platform_driver(struct of_platform_driver *drv) | |
142 | { | |
143 | /* initialize common driver fields */ | |
144 | drv->driver.name = drv->name; | |
145 | drv->driver.bus = &of_platform_bus_type; | |
146 | ||
147 | /* register with core */ | |
148 | return driver_register(&drv->driver); | |
149 | } | |
150 | EXPORT_SYMBOL(of_register_platform_driver); | |
151 | ||
152 | void of_unregister_platform_driver(struct of_platform_driver *drv) | |
153 | { | |
154 | driver_unregister(&drv->driver); | |
155 | } | |
156 | EXPORT_SYMBOL(of_unregister_platform_driver); | |
157 | ||
158 | static void of_platform_make_bus_id(struct of_device *dev) | |
159 | { | |
160 | struct device_node *node = dev->node; | |
161 | char *name = dev->dev.bus_id; | |
162 | const u32 *reg; | |
163 | u64 addr; | |
164 | ||
165 | /* | |
166 | * If it's a DCR based device, use 'd' for native DCRs | |
167 | * and 'D' for MMIO DCRs. | |
168 | */ | |
169 | #ifdef CONFIG_PPC_DCR | |
170 | reg = get_property(node, "dcr-reg", NULL); | |
171 | if (reg) { | |
172 | #ifdef CONFIG_PPC_DCR_NATIVE | |
173 | snprintf(name, BUS_ID_SIZE, "d%x.%s", | |
174 | *reg, node->name); | |
175 | #else /* CONFIG_PPC_DCR_NATIVE */ | |
176 | addr = of_translate_dcr_address(node, *reg, NULL); | |
177 | if (addr != OF_BAD_ADDR) { | |
178 | snprintf(name, BUS_ID_SIZE, | |
179 | "D%llx.%s", (unsigned long long)addr, | |
180 | node->name); | |
181 | return; | |
182 | } | |
183 | #endif /* !CONFIG_PPC_DCR_NATIVE */ | |
184 | } | |
185 | #endif /* CONFIG_PPC_DCR */ | |
186 | ||
187 | /* | |
188 | * For MMIO, get the physical address | |
189 | */ | |
190 | reg = get_property(node, "reg", NULL); | |
191 | if (reg) { | |
192 | addr = of_translate_address(node, reg); | |
193 | if (addr != OF_BAD_ADDR) { | |
194 | snprintf(name, BUS_ID_SIZE, | |
195 | "%llx.%s", (unsigned long long)addr, | |
196 | node->name); | |
197 | return; | |
198 | } | |
199 | } | |
200 | ||
201 | /* | |
202 | * No BusID, use the node name and pray | |
203 | */ | |
204 | snprintf(name, BUS_ID_SIZE, "%s", node->name); | |
205 | } | |
206 | ||
207 | struct of_device* of_platform_device_create(struct device_node *np, | |
208 | const char *bus_id, | |
209 | struct device *parent) | |
210 | { | |
211 | struct of_device *dev; | |
212 | ||
213 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
214 | if (!dev) | |
215 | return NULL; | |
216 | memset(dev, 0, sizeof(*dev)); | |
217 | ||
218 | dev->node = of_node_get(np); | |
219 | dev->dma_mask = 0xffffffffUL; | |
220 | dev->dev.dma_mask = &dev->dma_mask; | |
221 | dev->dev.parent = parent; | |
222 | dev->dev.bus = &of_platform_bus_type; | |
223 | dev->dev.release = of_release_dev; | |
224 | ||
225 | if (bus_id) | |
226 | strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE); | |
227 | else | |
228 | of_platform_make_bus_id(dev); | |
229 | ||
230 | if (of_device_register(dev) != 0) { | |
231 | kfree(dev); | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | return dev; | |
236 | } | |
237 | EXPORT_SYMBOL(of_platform_device_create); | |
238 | ||
239 | ||
240 | ||
241 | /** | |
242 | * of_platform_bus_create - Create an OF device for a bus node and all its | |
243 | * children. Optionally recursively instanciate matching busses. | |
244 | * @bus: device node of the bus to instanciate | |
245 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to | |
246 | * disallow recursive creation of child busses | |
247 | */ | |
248 | static int of_platform_bus_create(struct device_node *bus, | |
249 | struct of_device_id *matches, | |
250 | struct device *parent) | |
251 | { | |
252 | struct device_node *child; | |
253 | struct of_device *dev; | |
254 | int rc = 0; | |
255 | ||
256 | for (child = NULL; (child = of_get_next_child(bus, child)); ) { | |
257 | pr_debug(" create child: %s\n", child->full_name); | |
258 | dev = of_platform_device_create(child, NULL, parent); | |
259 | if (dev == NULL) | |
260 | rc = -ENOMEM; | |
261 | else if (!of_match_node(matches, child)) | |
262 | continue; | |
263 | if (rc == 0) { | |
264 | pr_debug(" and sub busses\n"); | |
265 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
266 | } if (rc) { | |
267 | of_node_put(child); | |
268 | break; | |
269 | } | |
270 | } | |
271 | return rc; | |
272 | } | |
273 | ||
274 | /** | |
275 | * of_platform_bus_probe - Probe the device-tree for platform busses | |
276 | * @root: parent of the first level to probe or NULL for the root of the tree | |
277 | * @matches: match table, NULL to use the default | |
278 | * @parent: parent to hook devices from, NULL for toplevel | |
279 | * | |
280 | * Note that children of the provided root are not instanciated as devices | |
281 | * unless the specified root itself matches the bus list and is not NULL. | |
282 | */ | |
283 | ||
284 | int of_platform_bus_probe(struct device_node *root, | |
285 | struct of_device_id *matches, | |
286 | struct device *parent) | |
287 | { | |
288 | struct device_node *child; | |
289 | struct of_device *dev; | |
290 | int rc = 0; | |
291 | ||
292 | if (matches == NULL) | |
293 | matches = of_default_bus_ids; | |
294 | if (matches == OF_NO_DEEP_PROBE) | |
295 | return -EINVAL; | |
296 | if (root == NULL) | |
297 | root = of_find_node_by_path("/"); | |
298 | else | |
299 | of_node_get(root); | |
300 | ||
301 | pr_debug("of_platform_bus_probe()\n"); | |
302 | pr_debug(" starting at: %s\n", root->full_name); | |
303 | ||
304 | /* Do a self check of bus type, if there's a match, create | |
305 | * children | |
306 | */ | |
307 | if (of_match_node(matches, root)) { | |
308 | pr_debug(" root match, create all sub devices\n"); | |
309 | dev = of_platform_device_create(root, NULL, parent); | |
310 | if (dev == NULL) { | |
311 | rc = -ENOMEM; | |
312 | goto bail; | |
313 | } | |
314 | pr_debug(" create all sub busses\n"); | |
315 | rc = of_platform_bus_create(root, matches, &dev->dev); | |
316 | goto bail; | |
317 | } | |
318 | for (child = NULL; (child = of_get_next_child(root, child)); ) { | |
319 | if (!of_match_node(matches, child)) | |
320 | continue; | |
321 | ||
322 | pr_debug(" match: %s\n", child->full_name); | |
323 | dev = of_platform_device_create(child, NULL, parent); | |
324 | if (dev == NULL) | |
325 | rc = -ENOMEM; | |
326 | else | |
327 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
328 | if (rc) { | |
329 | of_node_put(child); | |
330 | break; | |
331 | } | |
332 | } | |
333 | bail: | |
334 | of_node_put(root); | |
335 | return rc; | |
336 | } | |
337 | EXPORT_SYMBOL(of_platform_bus_probe); | |
338 | ||
339 | static int of_dev_node_match(struct device *dev, void *data) | |
340 | { | |
341 | return to_of_device(dev)->node == data; | |
342 | } | |
343 | ||
344 | struct of_device *of_find_device_by_node(struct device_node *np) | |
345 | { | |
346 | struct device *dev; | |
347 | ||
348 | dev = bus_find_device(&of_platform_bus_type, | |
349 | NULL, np, of_dev_node_match); | |
350 | if (dev) | |
351 | return to_of_device(dev); | |
352 | return NULL; | |
353 | } | |
354 | EXPORT_SYMBOL(of_find_device_by_node); | |
355 | ||
356 | static int of_dev_phandle_match(struct device *dev, void *data) | |
357 | { | |
358 | phandle *ph = data; | |
359 | return to_of_device(dev)->node->linux_phandle == *ph; | |
360 | } | |
361 | ||
362 | struct of_device *of_find_device_by_phandle(phandle ph) | |
363 | { | |
364 | struct device *dev; | |
365 | ||
366 | dev = bus_find_device(&of_platform_bus_type, | |
367 | NULL, &ph, of_dev_phandle_match); | |
368 | if (dev) | |
369 | return to_of_device(dev); | |
370 | return NULL; | |
371 | } | |
372 | EXPORT_SYMBOL(of_find_device_by_phandle); |