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7eebde70 BH |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4c9d2800 | 4 | * and Arnd Bergmann, IBM Corp. |
7eebde70 BH |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #undef DEBUG | |
14 | ||
15 | #include <linux/string.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/mod_devicetable.h> | |
20 | #include <linux/slab.h> | |
4c9d2800 | 21 | #include <linux/pci.h> |
7eebde70 BH |
22 | |
23 | #include <asm/errno.h> | |
24 | #include <asm/dcr.h> | |
25 | #include <asm/of_device.h> | |
26 | #include <asm/of_platform.h> | |
12d04eef | 27 | #include <asm/topology.h> |
4c9d2800 BH |
28 | #include <asm/pci-bridge.h> |
29 | #include <asm/ppc-pci.h> | |
9309180f BH |
30 | #include <asm/atomic.h> |
31 | ||
7eebde70 BH |
32 | /* |
33 | * The list of OF IDs below is used for matching bus types in the | |
34 | * system whose devices are to be exposed as of_platform_devices. | |
35 | * | |
36 | * This is the default list valid for most platforms. This file provides | |
37 | * functions who can take an explicit list if necessary though | |
38 | * | |
39 | * The search is always performed recursively looking for children of | |
40 | * the provided device_node and recursively if such a children matches | |
41 | * a bus type in the list | |
42 | */ | |
43 | ||
44 | static struct of_device_id of_default_bus_ids[] = { | |
45 | { .type = "soc", }, | |
46 | { .compatible = "soc", }, | |
47 | { .type = "spider", }, | |
48 | { .type = "axon", }, | |
49 | { .type = "plb5", }, | |
50 | { .type = "plb4", }, | |
51 | { .type = "opb", }, | |
4bc19626 | 52 | { .type = "ebc", }, |
7eebde70 BH |
53 | {}, |
54 | }; | |
55 | ||
9309180f BH |
56 | static atomic_t bus_no_reg_magic; |
57 | ||
7eebde70 BH |
58 | /* |
59 | * | |
60 | * OF platform device type definition & base infrastructure | |
61 | * | |
62 | */ | |
63 | ||
64 | static int of_platform_bus_match(struct device *dev, struct device_driver *drv) | |
65 | { | |
66 | struct of_device * of_dev = to_of_device(dev); | |
67 | struct of_platform_driver * of_drv = to_of_platform_driver(drv); | |
68 | const struct of_device_id * matches = of_drv->match_table; | |
69 | ||
70 | if (!matches) | |
71 | return 0; | |
72 | ||
73 | return of_match_device(matches, of_dev) != NULL; | |
74 | } | |
75 | ||
76 | static int of_platform_device_probe(struct device *dev) | |
77 | { | |
78 | int error = -ENODEV; | |
79 | struct of_platform_driver *drv; | |
80 | struct of_device *of_dev; | |
81 | const struct of_device_id *match; | |
82 | ||
83 | drv = to_of_platform_driver(dev->driver); | |
84 | of_dev = to_of_device(dev); | |
85 | ||
86 | if (!drv->probe) | |
87 | return error; | |
88 | ||
89 | of_dev_get(of_dev); | |
90 | ||
91 | match = of_match_device(drv->match_table, of_dev); | |
92 | if (match) | |
93 | error = drv->probe(of_dev, match); | |
94 | if (error) | |
95 | of_dev_put(of_dev); | |
96 | ||
97 | return error; | |
98 | } | |
99 | ||
100 | static int of_platform_device_remove(struct device *dev) | |
101 | { | |
102 | struct of_device * of_dev = to_of_device(dev); | |
103 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
104 | ||
105 | if (dev->driver && drv->remove) | |
106 | drv->remove(of_dev); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static int of_platform_device_suspend(struct device *dev, pm_message_t state) | |
111 | { | |
112 | struct of_device * of_dev = to_of_device(dev); | |
113 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
114 | int error = 0; | |
115 | ||
116 | if (dev->driver && drv->suspend) | |
117 | error = drv->suspend(of_dev, state); | |
118 | return error; | |
119 | } | |
120 | ||
121 | static int of_platform_device_resume(struct device * dev) | |
122 | { | |
123 | struct of_device * of_dev = to_of_device(dev); | |
124 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
125 | int error = 0; | |
126 | ||
127 | if (dev->driver && drv->resume) | |
128 | error = drv->resume(of_dev); | |
129 | return error; | |
130 | } | |
131 | ||
132 | struct bus_type of_platform_bus_type = { | |
133 | .name = "of_platform", | |
134 | .match = of_platform_bus_match, | |
1f9209cf | 135 | .uevent = of_device_uevent, |
7eebde70 BH |
136 | .probe = of_platform_device_probe, |
137 | .remove = of_platform_device_remove, | |
138 | .suspend = of_platform_device_suspend, | |
139 | .resume = of_platform_device_resume, | |
140 | }; | |
141 | EXPORT_SYMBOL(of_platform_bus_type); | |
142 | ||
143 | static int __init of_bus_driver_init(void) | |
144 | { | |
145 | return bus_register(&of_platform_bus_type); | |
146 | } | |
147 | ||
148 | postcore_initcall(of_bus_driver_init); | |
149 | ||
150 | int of_register_platform_driver(struct of_platform_driver *drv) | |
151 | { | |
152 | /* initialize common driver fields */ | |
153 | drv->driver.name = drv->name; | |
154 | drv->driver.bus = &of_platform_bus_type; | |
155 | ||
156 | /* register with core */ | |
157 | return driver_register(&drv->driver); | |
158 | } | |
159 | EXPORT_SYMBOL(of_register_platform_driver); | |
160 | ||
161 | void of_unregister_platform_driver(struct of_platform_driver *drv) | |
162 | { | |
163 | driver_unregister(&drv->driver); | |
164 | } | |
165 | EXPORT_SYMBOL(of_unregister_platform_driver); | |
166 | ||
167 | static void of_platform_make_bus_id(struct of_device *dev) | |
168 | { | |
169 | struct device_node *node = dev->node; | |
170 | char *name = dev->dev.bus_id; | |
171 | const u32 *reg; | |
172 | u64 addr; | |
30d36843 | 173 | int magic; |
7eebde70 BH |
174 | |
175 | /* | |
176 | * If it's a DCR based device, use 'd' for native DCRs | |
177 | * and 'D' for MMIO DCRs. | |
178 | */ | |
179 | #ifdef CONFIG_PPC_DCR | |
e2eb6392 | 180 | reg = of_get_property(node, "dcr-reg", NULL); |
7eebde70 BH |
181 | if (reg) { |
182 | #ifdef CONFIG_PPC_DCR_NATIVE | |
183 | snprintf(name, BUS_ID_SIZE, "d%x.%s", | |
184 | *reg, node->name); | |
185 | #else /* CONFIG_PPC_DCR_NATIVE */ | |
186 | addr = of_translate_dcr_address(node, *reg, NULL); | |
187 | if (addr != OF_BAD_ADDR) { | |
188 | snprintf(name, BUS_ID_SIZE, | |
189 | "D%llx.%s", (unsigned long long)addr, | |
190 | node->name); | |
191 | return; | |
192 | } | |
193 | #endif /* !CONFIG_PPC_DCR_NATIVE */ | |
194 | } | |
195 | #endif /* CONFIG_PPC_DCR */ | |
196 | ||
197 | /* | |
198 | * For MMIO, get the physical address | |
199 | */ | |
e2eb6392 | 200 | reg = of_get_property(node, "reg", NULL); |
7eebde70 BH |
201 | if (reg) { |
202 | addr = of_translate_address(node, reg); | |
203 | if (addr != OF_BAD_ADDR) { | |
204 | snprintf(name, BUS_ID_SIZE, | |
205 | "%llx.%s", (unsigned long long)addr, | |
206 | node->name); | |
207 | return; | |
208 | } | |
209 | } | |
210 | ||
211 | /* | |
9309180f BH |
212 | * No BusID, use the node name and add a globally incremented |
213 | * counter (and pray...) | |
7eebde70 | 214 | */ |
9309180f BH |
215 | magic = atomic_add_return(1, &bus_no_reg_magic); |
216 | snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1); | |
7eebde70 BH |
217 | } |
218 | ||
219 | struct of_device* of_platform_device_create(struct device_node *np, | |
220 | const char *bus_id, | |
221 | struct device *parent) | |
222 | { | |
223 | struct of_device *dev; | |
224 | ||
dd00cc48 | 225 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
7eebde70 BH |
226 | if (!dev) |
227 | return NULL; | |
7eebde70 BH |
228 | |
229 | dev->node = of_node_get(np); | |
230 | dev->dma_mask = 0xffffffffUL; | |
231 | dev->dev.dma_mask = &dev->dma_mask; | |
232 | dev->dev.parent = parent; | |
233 | dev->dev.bus = &of_platform_bus_type; | |
234 | dev->dev.release = of_release_dev; | |
12d04eef BH |
235 | dev->dev.archdata.of_node = np; |
236 | dev->dev.archdata.numa_node = of_node_to_nid(np); | |
237 | ||
238 | /* We do not fill the DMA ops for platform devices by default. | |
239 | * This is currently the responsibility of the platform code | |
240 | * to do such, possibly using a device notifier | |
241 | */ | |
7eebde70 BH |
242 | |
243 | if (bus_id) | |
244 | strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE); | |
245 | else | |
246 | of_platform_make_bus_id(dev); | |
247 | ||
248 | if (of_device_register(dev) != 0) { | |
249 | kfree(dev); | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | return dev; | |
254 | } | |
255 | EXPORT_SYMBOL(of_platform_device_create); | |
256 | ||
257 | ||
258 | ||
259 | /** | |
260 | * of_platform_bus_create - Create an OF device for a bus node and all its | |
261 | * children. Optionally recursively instanciate matching busses. | |
262 | * @bus: device node of the bus to instanciate | |
263 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to | |
264 | * disallow recursive creation of child busses | |
265 | */ | |
266 | static int of_platform_bus_create(struct device_node *bus, | |
267 | struct of_device_id *matches, | |
268 | struct device *parent) | |
269 | { | |
270 | struct device_node *child; | |
271 | struct of_device *dev; | |
272 | int rc = 0; | |
273 | ||
274 | for (child = NULL; (child = of_get_next_child(bus, child)); ) { | |
275 | pr_debug(" create child: %s\n", child->full_name); | |
276 | dev = of_platform_device_create(child, NULL, parent); | |
277 | if (dev == NULL) | |
278 | rc = -ENOMEM; | |
279 | else if (!of_match_node(matches, child)) | |
280 | continue; | |
281 | if (rc == 0) { | |
282 | pr_debug(" and sub busses\n"); | |
283 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
284 | } if (rc) { | |
285 | of_node_put(child); | |
286 | break; | |
287 | } | |
288 | } | |
289 | return rc; | |
290 | } | |
291 | ||
292 | /** | |
293 | * of_platform_bus_probe - Probe the device-tree for platform busses | |
294 | * @root: parent of the first level to probe or NULL for the root of the tree | |
295 | * @matches: match table, NULL to use the default | |
296 | * @parent: parent to hook devices from, NULL for toplevel | |
297 | * | |
298 | * Note that children of the provided root are not instanciated as devices | |
299 | * unless the specified root itself matches the bus list and is not NULL. | |
300 | */ | |
301 | ||
302 | int of_platform_bus_probe(struct device_node *root, | |
303 | struct of_device_id *matches, | |
304 | struct device *parent) | |
305 | { | |
306 | struct device_node *child; | |
307 | struct of_device *dev; | |
308 | int rc = 0; | |
309 | ||
310 | if (matches == NULL) | |
311 | matches = of_default_bus_ids; | |
312 | if (matches == OF_NO_DEEP_PROBE) | |
313 | return -EINVAL; | |
314 | if (root == NULL) | |
315 | root = of_find_node_by_path("/"); | |
316 | else | |
317 | of_node_get(root); | |
318 | ||
319 | pr_debug("of_platform_bus_probe()\n"); | |
320 | pr_debug(" starting at: %s\n", root->full_name); | |
321 | ||
322 | /* Do a self check of bus type, if there's a match, create | |
323 | * children | |
324 | */ | |
325 | if (of_match_node(matches, root)) { | |
326 | pr_debug(" root match, create all sub devices\n"); | |
327 | dev = of_platform_device_create(root, NULL, parent); | |
328 | if (dev == NULL) { | |
329 | rc = -ENOMEM; | |
330 | goto bail; | |
331 | } | |
332 | pr_debug(" create all sub busses\n"); | |
333 | rc = of_platform_bus_create(root, matches, &dev->dev); | |
334 | goto bail; | |
335 | } | |
336 | for (child = NULL; (child = of_get_next_child(root, child)); ) { | |
337 | if (!of_match_node(matches, child)) | |
338 | continue; | |
339 | ||
340 | pr_debug(" match: %s\n", child->full_name); | |
341 | dev = of_platform_device_create(child, NULL, parent); | |
342 | if (dev == NULL) | |
343 | rc = -ENOMEM; | |
344 | else | |
345 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
346 | if (rc) { | |
347 | of_node_put(child); | |
348 | break; | |
349 | } | |
350 | } | |
351 | bail: | |
352 | of_node_put(root); | |
353 | return rc; | |
354 | } | |
355 | EXPORT_SYMBOL(of_platform_bus_probe); | |
356 | ||
357 | static int of_dev_node_match(struct device *dev, void *data) | |
358 | { | |
359 | return to_of_device(dev)->node == data; | |
360 | } | |
361 | ||
362 | struct of_device *of_find_device_by_node(struct device_node *np) | |
363 | { | |
364 | struct device *dev; | |
365 | ||
366 | dev = bus_find_device(&of_platform_bus_type, | |
367 | NULL, np, of_dev_node_match); | |
368 | if (dev) | |
369 | return to_of_device(dev); | |
370 | return NULL; | |
371 | } | |
372 | EXPORT_SYMBOL(of_find_device_by_node); | |
373 | ||
374 | static int of_dev_phandle_match(struct device *dev, void *data) | |
375 | { | |
376 | phandle *ph = data; | |
377 | return to_of_device(dev)->node->linux_phandle == *ph; | |
378 | } | |
379 | ||
380 | struct of_device *of_find_device_by_phandle(phandle ph) | |
381 | { | |
382 | struct device *dev; | |
383 | ||
384 | dev = bus_find_device(&of_platform_bus_type, | |
385 | NULL, &ph, of_dev_phandle_match); | |
386 | if (dev) | |
387 | return to_of_device(dev); | |
388 | return NULL; | |
389 | } | |
390 | EXPORT_SYMBOL(of_find_device_by_phandle); | |
4c9d2800 BH |
391 | |
392 | ||
393 | #ifdef CONFIG_PPC_OF_PLATFORM_PCI | |
394 | ||
395 | /* The probing of PCI controllers from of_platform is currently | |
396 | * 64 bits only, mostly due to gratuitous differences between | |
397 | * the 32 and 64 bits PCI code on PowerPC and the 32 bits one | |
398 | * lacking some bits needed here. | |
399 | */ | |
400 | ||
401 | static int __devinit of_pci_phb_probe(struct of_device *dev, | |
402 | const struct of_device_id *match) | |
403 | { | |
404 | struct pci_controller *phb; | |
405 | ||
406 | /* Check if we can do that ... */ | |
407 | if (ppc_md.pci_setup_phb == NULL) | |
408 | return -ENODEV; | |
409 | ||
410 | printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); | |
411 | ||
412 | /* Alloc and setup PHB data structure */ | |
413 | phb = pcibios_alloc_controller(dev->node); | |
414 | if (!phb) | |
415 | return -ENODEV; | |
416 | ||
417 | /* Setup parent in sysfs */ | |
418 | phb->parent = &dev->dev; | |
419 | ||
420 | /* Setup the PHB using arch provided callback */ | |
421 | if (ppc_md.pci_setup_phb(phb)) { | |
422 | pcibios_free_controller(phb); | |
423 | return -ENODEV; | |
424 | } | |
425 | ||
426 | /* Process "ranges" property */ | |
427 | pci_process_bridge_OF_ranges(phb, dev->node, 0); | |
428 | ||
4c9d2800 BH |
429 | /* Init pci_dn data structures */ |
430 | pci_devs_phb_init_dynamic(phb); | |
431 | ||
432 | /* Register devices with EEH */ | |
433 | #ifdef CONFIG_EEH | |
434 | if (dev->node->child) | |
435 | eeh_add_device_tree_early(dev->node); | |
436 | #endif /* CONFIG_EEH */ | |
437 | ||
438 | /* Scan the bus */ | |
439 | scan_phb(phb); | |
440 | ||
441 | /* Claim resources. This might need some rework as well depending | |
442 | * wether we are doing probe-only or not, like assigning unassigned | |
443 | * resources etc... | |
444 | */ | |
445 | pcibios_claim_one_bus(phb->bus); | |
446 | ||
447 | /* Finish EEH setup */ | |
448 | #ifdef CONFIG_EEH | |
449 | eeh_add_device_tree_late(phb->bus); | |
450 | #endif | |
451 | ||
452 | /* Add probed PCI devices to the device model */ | |
453 | pci_bus_add_devices(phb->bus); | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | static struct of_device_id of_pci_phb_ids[] = { | |
459 | { .type = "pci", }, | |
460 | { .type = "pcix", }, | |
461 | { .type = "pcie", }, | |
462 | { .type = "pciex", }, | |
463 | { .type = "ht", }, | |
464 | {} | |
465 | }; | |
466 | ||
467 | static struct of_platform_driver of_pci_phb_driver = { | |
468 | .name = "of-pci", | |
469 | .match_table = of_pci_phb_ids, | |
470 | .probe = of_pci_phb_probe, | |
4c9d2800 BH |
471 | }; |
472 | ||
473 | static __init int of_pci_phb_init(void) | |
474 | { | |
475 | return of_register_platform_driver(&of_pci_phb_driver); | |
476 | } | |
477 | ||
478 | device_initcall(of_pci_phb_init); | |
479 | ||
480 | #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ |