Merge branch 'master' into 85xx
[linux-2.6] / arch / powerpc / kernel / of_platform.c
1 /*
2  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3  *                       <benh@kernel.crashing.org>
4  *    and                Arnd Bergmann, IBM Corp.
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>
21 #include <linux/pci.h>
22
23 #include <asm/errno.h>
24 #include <asm/dcr.h>
25 #include <asm/of_device.h>
26 #include <asm/of_platform.h>
27 #include <asm/topology.h>
28 #include <asm/pci-bridge.h>
29 #include <asm/ppc-pci.h>
30 #include <asm/atomic.h>
31
32
33 /*
34  * The list of OF IDs below is used for matching bus types in the
35  * system whose devices are to be exposed as of_platform_devices.
36  *
37  * This is the default list valid for most platforms. This file provides
38  * functions who can take an explicit list if necessary though
39  *
40  * The search is always performed recursively looking for children of
41  * the provided device_node and recursively if such a children matches
42  * a bus type in the list
43  */
44
45 static struct of_device_id of_default_bus_ids[] = {
46         { .type = "soc", },
47         { .compatible = "soc", },
48         { .type = "spider", },
49         { .type = "axon", },
50         { .type = "plb5", },
51         { .type = "plb4", },
52         { .type = "opb", },
53         { .type = "ebc", },
54         {},
55 };
56
57 static atomic_t bus_no_reg_magic;
58
59 /*
60  *
61  * OF platform device type definition & base infrastructure
62  *
63  */
64
65 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
66 {
67         struct of_device * of_dev = to_of_device(dev);
68         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
69         const struct of_device_id * matches = of_drv->match_table;
70
71         if (!matches)
72                 return 0;
73
74         return of_match_device(matches, of_dev) != NULL;
75 }
76
77 static int of_platform_device_probe(struct device *dev)
78 {
79         int error = -ENODEV;
80         struct of_platform_driver *drv;
81         struct of_device *of_dev;
82         const struct of_device_id *match;
83
84         drv = to_of_platform_driver(dev->driver);
85         of_dev = to_of_device(dev);
86
87         if (!drv->probe)
88                 return error;
89
90         of_dev_get(of_dev);
91
92         match = of_match_device(drv->match_table, of_dev);
93         if (match)
94                 error = drv->probe(of_dev, match);
95         if (error)
96                 of_dev_put(of_dev);
97
98         return error;
99 }
100
101 static int of_platform_device_remove(struct device *dev)
102 {
103         struct of_device * of_dev = to_of_device(dev);
104         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
105
106         if (dev->driver && drv->remove)
107                 drv->remove(of_dev);
108         return 0;
109 }
110
111 static int of_platform_device_suspend(struct device *dev, pm_message_t state)
112 {
113         struct of_device * of_dev = to_of_device(dev);
114         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
115         int error = 0;
116
117         if (dev->driver && drv->suspend)
118                 error = drv->suspend(of_dev, state);
119         return error;
120 }
121
122 static int of_platform_device_resume(struct device * dev)
123 {
124         struct of_device * of_dev = to_of_device(dev);
125         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
126         int error = 0;
127
128         if (dev->driver && drv->resume)
129                 error = drv->resume(of_dev);
130         return error;
131 }
132
133 struct bus_type of_platform_bus_type = {
134        .name    = "of_platform",
135        .match   = of_platform_bus_match,
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;
173         int magic;
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
180         reg = get_property(node, "dcr-reg", NULL);
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          */
200         reg = get_property(node, "reg", NULL);
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         /*
212          * No BusID, use the node name and add a globally incremented
213          * counter (and pray...)
214          */
215         magic = atomic_add_return(1, &bus_no_reg_magic);
216         snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
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
225         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
226         if (!dev)
227                 return NULL;
228         memset(dev, 0, sizeof(*dev));
229
230         dev->node = of_node_get(np);
231         dev->dma_mask = 0xffffffffUL;
232         dev->dev.dma_mask = &dev->dma_mask;
233         dev->dev.parent = parent;
234         dev->dev.bus = &of_platform_bus_type;
235         dev->dev.release = of_release_dev;
236         dev->dev.archdata.of_node = np;
237         dev->dev.archdata.numa_node = of_node_to_nid(np);
238
239         /* We do not fill the DMA ops for platform devices by default.
240          * This is currently the responsibility of the platform code
241          * to do such, possibly using a device notifier
242          */
243
244         if (bus_id)
245                 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
246         else
247                 of_platform_make_bus_id(dev);
248
249         if (of_device_register(dev) != 0) {
250                 kfree(dev);
251                 return NULL;
252         }
253
254         return dev;
255 }
256 EXPORT_SYMBOL(of_platform_device_create);
257
258
259
260 /**
261  * of_platform_bus_create - Create an OF device for a bus node and all its
262  * children. Optionally recursively instanciate matching busses.
263  * @bus: device node of the bus to instanciate
264  * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
265  * disallow recursive creation of child busses
266  */
267 static int of_platform_bus_create(struct device_node *bus,
268                                   struct of_device_id *matches,
269                                   struct device *parent)
270 {
271         struct device_node *child;
272         struct of_device *dev;
273         int rc = 0;
274
275         for (child = NULL; (child = of_get_next_child(bus, child)); ) {
276                 pr_debug("   create child: %s\n", child->full_name);
277                 dev = of_platform_device_create(child, NULL, parent);
278                 if (dev == NULL)
279                         rc = -ENOMEM;
280                 else if (!of_match_node(matches, child))
281                         continue;
282                 if (rc == 0) {
283                         pr_debug("   and sub busses\n");
284                         rc = of_platform_bus_create(child, matches, &dev->dev);
285                 } if (rc) {
286                         of_node_put(child);
287                         break;
288                 }
289         }
290         return rc;
291 }
292
293 /**
294  * of_platform_bus_probe - Probe the device-tree for platform busses
295  * @root: parent of the first level to probe or NULL for the root of the tree
296  * @matches: match table, NULL to use the default
297  * @parent: parent to hook devices from, NULL for toplevel
298  *
299  * Note that children of the provided root are not instanciated as devices
300  * unless the specified root itself matches the bus list and is not NULL.
301  */
302
303 int of_platform_bus_probe(struct device_node *root,
304                           struct of_device_id *matches,
305                           struct device *parent)
306 {
307         struct device_node *child;
308         struct of_device *dev;
309         int rc = 0;
310
311         if (matches == NULL)
312                 matches = of_default_bus_ids;
313         if (matches == OF_NO_DEEP_PROBE)
314                 return -EINVAL;
315         if (root == NULL)
316                 root = of_find_node_by_path("/");
317         else
318                 of_node_get(root);
319
320         pr_debug("of_platform_bus_probe()\n");
321         pr_debug(" starting at: %s\n", root->full_name);
322
323         /* Do a self check of bus type, if there's a match, create
324          * children
325          */
326         if (of_match_node(matches, root)) {
327                 pr_debug(" root match, create all sub devices\n");
328                 dev = of_platform_device_create(root, NULL, parent);
329                 if (dev == NULL) {
330                         rc = -ENOMEM;
331                         goto bail;
332                 }
333                 pr_debug(" create all sub busses\n");
334                 rc = of_platform_bus_create(root, matches, &dev->dev);
335                 goto bail;
336         }
337         for (child = NULL; (child = of_get_next_child(root, child)); ) {
338                 if (!of_match_node(matches, child))
339                         continue;
340
341                 pr_debug("  match: %s\n", child->full_name);
342                 dev = of_platform_device_create(child, NULL, parent);
343                 if (dev == NULL)
344                         rc = -ENOMEM;
345                 else
346                         rc = of_platform_bus_create(child, matches, &dev->dev);
347                 if (rc) {
348                         of_node_put(child);
349                         break;
350                 }
351         }
352  bail:
353         of_node_put(root);
354         return rc;
355 }
356 EXPORT_SYMBOL(of_platform_bus_probe);
357
358 static int of_dev_node_match(struct device *dev, void *data)
359 {
360         return to_of_device(dev)->node == data;
361 }
362
363 struct of_device *of_find_device_by_node(struct device_node *np)
364 {
365         struct device *dev;
366
367         dev = bus_find_device(&of_platform_bus_type,
368                               NULL, np, of_dev_node_match);
369         if (dev)
370                 return to_of_device(dev);
371         return NULL;
372 }
373 EXPORT_SYMBOL(of_find_device_by_node);
374
375 static int of_dev_phandle_match(struct device *dev, void *data)
376 {
377         phandle *ph = data;
378         return to_of_device(dev)->node->linux_phandle == *ph;
379 }
380
381 struct of_device *of_find_device_by_phandle(phandle ph)
382 {
383         struct device *dev;
384
385         dev = bus_find_device(&of_platform_bus_type,
386                               NULL, &ph, of_dev_phandle_match);
387         if (dev)
388                 return to_of_device(dev);
389         return NULL;
390 }
391 EXPORT_SYMBOL(of_find_device_by_phandle);
392
393
394 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
395
396 /* The probing of PCI controllers from of_platform is currently
397  * 64 bits only, mostly due to gratuitous differences between
398  * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
399  * lacking some bits needed here.
400  */
401
402 static int __devinit of_pci_phb_probe(struct of_device *dev,
403                                       const struct of_device_id *match)
404 {
405         struct pci_controller *phb;
406
407         /* Check if we can do that ... */
408         if (ppc_md.pci_setup_phb == NULL)
409                 return -ENODEV;
410
411         printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
412
413         /* Alloc and setup PHB data structure */
414         phb = pcibios_alloc_controller(dev->node);
415         if (!phb)
416                 return -ENODEV;
417
418         /* Setup parent in sysfs */
419         phb->parent = &dev->dev;
420
421         /* Setup the PHB using arch provided callback */
422         if (ppc_md.pci_setup_phb(phb)) {
423                 pcibios_free_controller(phb);
424                 return -ENODEV;
425         }
426
427         /* Process "ranges" property */
428         pci_process_bridge_OF_ranges(phb, dev->node, 0);
429
430         /* Setup IO space.
431          * This will not work properly for ISA IOs, something needs to be done
432          * about it if we ever generalize that way of probing PCI brigdes
433          */
434         pci_setup_phb_io_dynamic(phb, 0);
435
436         /* Init pci_dn data structures */
437         pci_devs_phb_init_dynamic(phb);
438
439         /* Register devices with EEH */
440 #ifdef CONFIG_EEH
441         if (dev->node->child)
442                 eeh_add_device_tree_early(dev->node);
443 #endif /* CONFIG_EEH */
444
445         /* Scan the bus */
446         scan_phb(phb);
447
448         /* Claim resources. This might need some rework as well depending
449          * wether we are doing probe-only or not, like assigning unassigned
450          * resources etc...
451          */
452         pcibios_claim_one_bus(phb->bus);
453
454         /* Finish EEH setup */
455 #ifdef CONFIG_EEH
456         eeh_add_device_tree_late(phb->bus);
457 #endif
458
459         /* Add probed PCI devices to the device model */
460         pci_bus_add_devices(phb->bus);
461
462         return 0;
463 }
464
465 static struct of_device_id of_pci_phb_ids[] = {
466         { .type = "pci", },
467         { .type = "pcix", },
468         { .type = "pcie", },
469         { .type = "pciex", },
470         { .type = "ht", },
471         {}
472 };
473
474 static struct of_platform_driver of_pci_phb_driver = {
475        .name = "of-pci",
476        .match_table = of_pci_phb_ids,
477        .probe = of_pci_phb_probe,
478        .driver = {
479                .multithread_probe = 1,
480        },
481 };
482
483 static __init int of_pci_phb_init(void)
484 {
485         return of_register_platform_driver(&of_pci_phb_driver);
486 }
487
488 device_initcall(of_pci_phb_init);
489
490 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */