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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> | |
7eebde70 BH |
30 | |
31 | /* | |
32 | * The list of OF IDs below is used for matching bus types in the | |
33 | * system whose devices are to be exposed as of_platform_devices. | |
34 | * | |
35 | * This is the default list valid for most platforms. This file provides | |
36 | * functions who can take an explicit list if necessary though | |
37 | * | |
38 | * The search is always performed recursively looking for children of | |
39 | * the provided device_node and recursively if such a children matches | |
40 | * a bus type in the list | |
41 | */ | |
42 | ||
43 | static struct of_device_id of_default_bus_ids[] = { | |
44 | { .type = "soc", }, | |
45 | { .compatible = "soc", }, | |
46 | { .type = "spider", }, | |
47 | { .type = "axon", }, | |
48 | { .type = "plb5", }, | |
49 | { .type = "plb4", }, | |
50 | { .type = "opb", }, | |
51 | {}, | |
52 | }; | |
53 | ||
54 | /* | |
55 | * | |
56 | * OF platform device type definition & base infrastructure | |
57 | * | |
58 | */ | |
59 | ||
60 | static int of_platform_bus_match(struct device *dev, struct device_driver *drv) | |
61 | { | |
62 | struct of_device * of_dev = to_of_device(dev); | |
63 | struct of_platform_driver * of_drv = to_of_platform_driver(drv); | |
64 | const struct of_device_id * matches = of_drv->match_table; | |
65 | ||
66 | if (!matches) | |
67 | return 0; | |
68 | ||
69 | return of_match_device(matches, of_dev) != NULL; | |
70 | } | |
71 | ||
72 | static int of_platform_device_probe(struct device *dev) | |
73 | { | |
74 | int error = -ENODEV; | |
75 | struct of_platform_driver *drv; | |
76 | struct of_device *of_dev; | |
77 | const struct of_device_id *match; | |
78 | ||
79 | drv = to_of_platform_driver(dev->driver); | |
80 | of_dev = to_of_device(dev); | |
81 | ||
82 | if (!drv->probe) | |
83 | return error; | |
84 | ||
85 | of_dev_get(of_dev); | |
86 | ||
87 | match = of_match_device(drv->match_table, of_dev); | |
88 | if (match) | |
89 | error = drv->probe(of_dev, match); | |
90 | if (error) | |
91 | of_dev_put(of_dev); | |
92 | ||
93 | return error; | |
94 | } | |
95 | ||
96 | static int of_platform_device_remove(struct device *dev) | |
97 | { | |
98 | struct of_device * of_dev = to_of_device(dev); | |
99 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
100 | ||
101 | if (dev->driver && drv->remove) | |
102 | drv->remove(of_dev); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int of_platform_device_suspend(struct device *dev, pm_message_t state) | |
107 | { | |
108 | struct of_device * of_dev = to_of_device(dev); | |
109 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
110 | int error = 0; | |
111 | ||
112 | if (dev->driver && drv->suspend) | |
113 | error = drv->suspend(of_dev, state); | |
114 | return error; | |
115 | } | |
116 | ||
117 | static int of_platform_device_resume(struct device * dev) | |
118 | { | |
119 | struct of_device * of_dev = to_of_device(dev); | |
120 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
121 | int error = 0; | |
122 | ||
123 | if (dev->driver && drv->resume) | |
124 | error = drv->resume(of_dev); | |
125 | return error; | |
126 | } | |
127 | ||
128 | struct bus_type of_platform_bus_type = { | |
129 | .name = "of_platform", | |
130 | .match = of_platform_bus_match, | |
131 | .probe = of_platform_device_probe, | |
132 | .remove = of_platform_device_remove, | |
133 | .suspend = of_platform_device_suspend, | |
134 | .resume = of_platform_device_resume, | |
135 | }; | |
136 | EXPORT_SYMBOL(of_platform_bus_type); | |
137 | ||
138 | static int __init of_bus_driver_init(void) | |
139 | { | |
140 | return bus_register(&of_platform_bus_type); | |
141 | } | |
142 | ||
143 | postcore_initcall(of_bus_driver_init); | |
144 | ||
145 | int of_register_platform_driver(struct of_platform_driver *drv) | |
146 | { | |
147 | /* initialize common driver fields */ | |
148 | drv->driver.name = drv->name; | |
149 | drv->driver.bus = &of_platform_bus_type; | |
150 | ||
151 | /* register with core */ | |
152 | return driver_register(&drv->driver); | |
153 | } | |
154 | EXPORT_SYMBOL(of_register_platform_driver); | |
155 | ||
156 | void of_unregister_platform_driver(struct of_platform_driver *drv) | |
157 | { | |
158 | driver_unregister(&drv->driver); | |
159 | } | |
160 | EXPORT_SYMBOL(of_unregister_platform_driver); | |
161 | ||
162 | static void of_platform_make_bus_id(struct of_device *dev) | |
163 | { | |
164 | struct device_node *node = dev->node; | |
165 | char *name = dev->dev.bus_id; | |
166 | const u32 *reg; | |
167 | u64 addr; | |
168 | ||
169 | /* | |
170 | * If it's a DCR based device, use 'd' for native DCRs | |
171 | * and 'D' for MMIO DCRs. | |
172 | */ | |
173 | #ifdef CONFIG_PPC_DCR | |
174 | reg = get_property(node, "dcr-reg", NULL); | |
175 | if (reg) { | |
176 | #ifdef CONFIG_PPC_DCR_NATIVE | |
177 | snprintf(name, BUS_ID_SIZE, "d%x.%s", | |
178 | *reg, node->name); | |
179 | #else /* CONFIG_PPC_DCR_NATIVE */ | |
180 | addr = of_translate_dcr_address(node, *reg, NULL); | |
181 | if (addr != OF_BAD_ADDR) { | |
182 | snprintf(name, BUS_ID_SIZE, | |
183 | "D%llx.%s", (unsigned long long)addr, | |
184 | node->name); | |
185 | return; | |
186 | } | |
187 | #endif /* !CONFIG_PPC_DCR_NATIVE */ | |
188 | } | |
189 | #endif /* CONFIG_PPC_DCR */ | |
190 | ||
191 | /* | |
192 | * For MMIO, get the physical address | |
193 | */ | |
194 | reg = get_property(node, "reg", NULL); | |
195 | if (reg) { | |
196 | addr = of_translate_address(node, reg); | |
197 | if (addr != OF_BAD_ADDR) { | |
198 | snprintf(name, BUS_ID_SIZE, | |
199 | "%llx.%s", (unsigned long long)addr, | |
200 | node->name); | |
201 | return; | |
202 | } | |
203 | } | |
204 | ||
205 | /* | |
206 | * No BusID, use the node name and pray | |
207 | */ | |
208 | snprintf(name, BUS_ID_SIZE, "%s", node->name); | |
209 | } | |
210 | ||
211 | struct of_device* of_platform_device_create(struct device_node *np, | |
212 | const char *bus_id, | |
213 | struct device *parent) | |
214 | { | |
215 | struct of_device *dev; | |
216 | ||
217 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
218 | if (!dev) | |
219 | return NULL; | |
220 | memset(dev, 0, sizeof(*dev)); | |
221 | ||
222 | dev->node = of_node_get(np); | |
223 | dev->dma_mask = 0xffffffffUL; | |
224 | dev->dev.dma_mask = &dev->dma_mask; | |
225 | dev->dev.parent = parent; | |
226 | dev->dev.bus = &of_platform_bus_type; | |
227 | dev->dev.release = of_release_dev; | |
12d04eef BH |
228 | dev->dev.archdata.of_node = np; |
229 | dev->dev.archdata.numa_node = of_node_to_nid(np); | |
230 | ||
231 | /* We do not fill the DMA ops for platform devices by default. | |
232 | * This is currently the responsibility of the platform code | |
233 | * to do such, possibly using a device notifier | |
234 | */ | |
7eebde70 BH |
235 | |
236 | if (bus_id) | |
237 | strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE); | |
238 | else | |
239 | of_platform_make_bus_id(dev); | |
240 | ||
241 | if (of_device_register(dev) != 0) { | |
242 | kfree(dev); | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | return dev; | |
247 | } | |
248 | EXPORT_SYMBOL(of_platform_device_create); | |
249 | ||
250 | ||
251 | ||
252 | /** | |
253 | * of_platform_bus_create - Create an OF device for a bus node and all its | |
254 | * children. Optionally recursively instanciate matching busses. | |
255 | * @bus: device node of the bus to instanciate | |
256 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to | |
257 | * disallow recursive creation of child busses | |
258 | */ | |
259 | static int of_platform_bus_create(struct device_node *bus, | |
260 | struct of_device_id *matches, | |
261 | struct device *parent) | |
262 | { | |
263 | struct device_node *child; | |
264 | struct of_device *dev; | |
265 | int rc = 0; | |
266 | ||
267 | for (child = NULL; (child = of_get_next_child(bus, child)); ) { | |
268 | pr_debug(" create child: %s\n", child->full_name); | |
269 | dev = of_platform_device_create(child, NULL, parent); | |
270 | if (dev == NULL) | |
271 | rc = -ENOMEM; | |
272 | else if (!of_match_node(matches, child)) | |
273 | continue; | |
274 | if (rc == 0) { | |
275 | pr_debug(" and sub busses\n"); | |
276 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
277 | } if (rc) { | |
278 | of_node_put(child); | |
279 | break; | |
280 | } | |
281 | } | |
282 | return rc; | |
283 | } | |
284 | ||
285 | /** | |
286 | * of_platform_bus_probe - Probe the device-tree for platform busses | |
287 | * @root: parent of the first level to probe or NULL for the root of the tree | |
288 | * @matches: match table, NULL to use the default | |
289 | * @parent: parent to hook devices from, NULL for toplevel | |
290 | * | |
291 | * Note that children of the provided root are not instanciated as devices | |
292 | * unless the specified root itself matches the bus list and is not NULL. | |
293 | */ | |
294 | ||
295 | int of_platform_bus_probe(struct device_node *root, | |
296 | struct of_device_id *matches, | |
297 | struct device *parent) | |
298 | { | |
299 | struct device_node *child; | |
300 | struct of_device *dev; | |
301 | int rc = 0; | |
302 | ||
303 | if (matches == NULL) | |
304 | matches = of_default_bus_ids; | |
305 | if (matches == OF_NO_DEEP_PROBE) | |
306 | return -EINVAL; | |
307 | if (root == NULL) | |
308 | root = of_find_node_by_path("/"); | |
309 | else | |
310 | of_node_get(root); | |
311 | ||
312 | pr_debug("of_platform_bus_probe()\n"); | |
313 | pr_debug(" starting at: %s\n", root->full_name); | |
314 | ||
315 | /* Do a self check of bus type, if there's a match, create | |
316 | * children | |
317 | */ | |
318 | if (of_match_node(matches, root)) { | |
319 | pr_debug(" root match, create all sub devices\n"); | |
320 | dev = of_platform_device_create(root, NULL, parent); | |
321 | if (dev == NULL) { | |
322 | rc = -ENOMEM; | |
323 | goto bail; | |
324 | } | |
325 | pr_debug(" create all sub busses\n"); | |
326 | rc = of_platform_bus_create(root, matches, &dev->dev); | |
327 | goto bail; | |
328 | } | |
329 | for (child = NULL; (child = of_get_next_child(root, child)); ) { | |
330 | if (!of_match_node(matches, child)) | |
331 | continue; | |
332 | ||
333 | pr_debug(" match: %s\n", child->full_name); | |
334 | dev = of_platform_device_create(child, NULL, parent); | |
335 | if (dev == NULL) | |
336 | rc = -ENOMEM; | |
337 | else | |
338 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
339 | if (rc) { | |
340 | of_node_put(child); | |
341 | break; | |
342 | } | |
343 | } | |
344 | bail: | |
345 | of_node_put(root); | |
346 | return rc; | |
347 | } | |
348 | EXPORT_SYMBOL(of_platform_bus_probe); | |
349 | ||
350 | static int of_dev_node_match(struct device *dev, void *data) | |
351 | { | |
352 | return to_of_device(dev)->node == data; | |
353 | } | |
354 | ||
355 | struct of_device *of_find_device_by_node(struct device_node *np) | |
356 | { | |
357 | struct device *dev; | |
358 | ||
359 | dev = bus_find_device(&of_platform_bus_type, | |
360 | NULL, np, of_dev_node_match); | |
361 | if (dev) | |
362 | return to_of_device(dev); | |
363 | return NULL; | |
364 | } | |
365 | EXPORT_SYMBOL(of_find_device_by_node); | |
366 | ||
367 | static int of_dev_phandle_match(struct device *dev, void *data) | |
368 | { | |
369 | phandle *ph = data; | |
370 | return to_of_device(dev)->node->linux_phandle == *ph; | |
371 | } | |
372 | ||
373 | struct of_device *of_find_device_by_phandle(phandle ph) | |
374 | { | |
375 | struct device *dev; | |
376 | ||
377 | dev = bus_find_device(&of_platform_bus_type, | |
378 | NULL, &ph, of_dev_phandle_match); | |
379 | if (dev) | |
380 | return to_of_device(dev); | |
381 | return NULL; | |
382 | } | |
383 | EXPORT_SYMBOL(of_find_device_by_phandle); | |
4c9d2800 BH |
384 | |
385 | ||
386 | #ifdef CONFIG_PPC_OF_PLATFORM_PCI | |
387 | ||
388 | /* The probing of PCI controllers from of_platform is currently | |
389 | * 64 bits only, mostly due to gratuitous differences between | |
390 | * the 32 and 64 bits PCI code on PowerPC and the 32 bits one | |
391 | * lacking some bits needed here. | |
392 | */ | |
393 | ||
394 | static int __devinit of_pci_phb_probe(struct of_device *dev, | |
395 | const struct of_device_id *match) | |
396 | { | |
397 | struct pci_controller *phb; | |
398 | ||
399 | /* Check if we can do that ... */ | |
400 | if (ppc_md.pci_setup_phb == NULL) | |
401 | return -ENODEV; | |
402 | ||
403 | printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); | |
404 | ||
405 | /* Alloc and setup PHB data structure */ | |
406 | phb = pcibios_alloc_controller(dev->node); | |
407 | if (!phb) | |
408 | return -ENODEV; | |
409 | ||
410 | /* Setup parent in sysfs */ | |
411 | phb->parent = &dev->dev; | |
412 | ||
413 | /* Setup the PHB using arch provided callback */ | |
414 | if (ppc_md.pci_setup_phb(phb)) { | |
415 | pcibios_free_controller(phb); | |
416 | return -ENODEV; | |
417 | } | |
418 | ||
419 | /* Process "ranges" property */ | |
420 | pci_process_bridge_OF_ranges(phb, dev->node, 0); | |
421 | ||
422 | /* Setup IO space. | |
423 | * This will not work properly for ISA IOs, something needs to be done | |
424 | * about it if we ever generalize that way of probing PCI brigdes | |
425 | */ | |
426 | pci_setup_phb_io_dynamic(phb, 0); | |
427 | ||
428 | /* Init pci_dn data structures */ | |
429 | pci_devs_phb_init_dynamic(phb); | |
430 | ||
431 | /* Register devices with EEH */ | |
432 | #ifdef CONFIG_EEH | |
433 | if (dev->node->child) | |
434 | eeh_add_device_tree_early(dev->node); | |
435 | #endif /* CONFIG_EEH */ | |
436 | ||
437 | /* Scan the bus */ | |
438 | scan_phb(phb); | |
439 | ||
440 | /* Claim resources. This might need some rework as well depending | |
441 | * wether we are doing probe-only or not, like assigning unassigned | |
442 | * resources etc... | |
443 | */ | |
444 | pcibios_claim_one_bus(phb->bus); | |
445 | ||
446 | /* Finish EEH setup */ | |
447 | #ifdef CONFIG_EEH | |
448 | eeh_add_device_tree_late(phb->bus); | |
449 | #endif | |
450 | ||
451 | /* Add probed PCI devices to the device model */ | |
452 | pci_bus_add_devices(phb->bus); | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static struct of_device_id of_pci_phb_ids[] = { | |
458 | { .type = "pci", }, | |
459 | { .type = "pcix", }, | |
460 | { .type = "pcie", }, | |
461 | { .type = "pciex", }, | |
462 | { .type = "ht", }, | |
463 | {} | |
464 | }; | |
465 | ||
466 | static struct of_platform_driver of_pci_phb_driver = { | |
467 | .name = "of-pci", | |
468 | .match_table = of_pci_phb_ids, | |
469 | .probe = of_pci_phb_probe, | |
470 | .driver = { | |
471 | .multithread_probe = 1, | |
472 | }, | |
473 | }; | |
474 | ||
475 | static __init int of_pci_phb_init(void) | |
476 | { | |
477 | return of_register_platform_driver(&of_pci_phb_driver); | |
478 | } | |
479 | ||
480 | device_initcall(of_pci_phb_init); | |
481 | ||
482 | #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ |