Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[sfrench/cifs-2.6.git] / arch / sparc64 / kernel / of_device.c
1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/mod_devicetable.h>
6 #include <linux/slab.h>
7
8 #include <asm/errno.h>
9 #include <asm/of_device.h>
10
11 /**
12  * of_match_device - Tell if an of_device structure has a matching
13  * of_match structure
14  * @ids: array of of device match structures to search in
15  * @dev: the of device structure to match against
16  *
17  * Used by a driver to check whether an of_device present in the
18  * system is in its list of supported devices.
19  */
20 const struct of_device_id *of_match_device(const struct of_device_id *matches,
21                                         const struct of_device *dev)
22 {
23         if (!dev->node)
24                 return NULL;
25         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
26                 int match = 1;
27                 if (matches->name[0])
28                         match &= dev->node->name
29                                 && !strcmp(matches->name, dev->node->name);
30                 if (matches->type[0])
31                         match &= dev->node->type
32                                 && !strcmp(matches->type, dev->node->type);
33                 if (matches->compatible[0])
34                         match &= of_device_is_compatible(dev->node,
35                                                          matches->compatible);
36                 if (match)
37                         return matches;
38                 matches++;
39         }
40         return NULL;
41 }
42
43 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
44 {
45         struct of_device * of_dev = to_of_device(dev);
46         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
47         const struct of_device_id * matches = of_drv->match_table;
48
49         if (!matches)
50                 return 0;
51
52         return of_match_device(matches, of_dev) != NULL;
53 }
54
55 struct of_device *of_dev_get(struct of_device *dev)
56 {
57         struct device *tmp;
58
59         if (!dev)
60                 return NULL;
61         tmp = get_device(&dev->dev);
62         if (tmp)
63                 return to_of_device(tmp);
64         else
65                 return NULL;
66 }
67
68 void of_dev_put(struct of_device *dev)
69 {
70         if (dev)
71                 put_device(&dev->dev);
72 }
73
74
75 static int of_device_probe(struct device *dev)
76 {
77         int error = -ENODEV;
78         struct of_platform_driver *drv;
79         struct of_device *of_dev;
80         const struct of_device_id *match;
81
82         drv = to_of_platform_driver(dev->driver);
83         of_dev = to_of_device(dev);
84
85         if (!drv->probe)
86                 return error;
87
88         of_dev_get(of_dev);
89
90         match = of_match_device(drv->match_table, of_dev);
91         if (match)
92                 error = drv->probe(of_dev, match);
93         if (error)
94                 of_dev_put(of_dev);
95
96         return error;
97 }
98
99 static int of_device_remove(struct device *dev)
100 {
101         struct of_device * of_dev = to_of_device(dev);
102         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
103
104         if (dev->driver && drv->remove)
105                 drv->remove(of_dev);
106         return 0;
107 }
108
109 static int of_device_suspend(struct device *dev, pm_message_t state)
110 {
111         struct of_device * of_dev = to_of_device(dev);
112         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
113         int error = 0;
114
115         if (dev->driver && drv->suspend)
116                 error = drv->suspend(of_dev, state);
117         return error;
118 }
119
120 static int of_device_resume(struct device * dev)
121 {
122         struct of_device * of_dev = to_of_device(dev);
123         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
124         int error = 0;
125
126         if (dev->driver && drv->resume)
127                 error = drv->resume(of_dev);
128         return error;
129 }
130
131 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
132 {
133         unsigned long ret = res->start + offset;
134         struct resource *r;
135
136         if (res->flags & IORESOURCE_MEM)
137                 r = request_mem_region(ret, size, name);
138         else
139                 r = request_region(ret, size, name);
140         if (!r)
141                 ret = 0;
142
143         return (void __iomem *) ret;
144 }
145 EXPORT_SYMBOL(of_ioremap);
146
147 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
148 {
149         if (res->flags & IORESOURCE_MEM)
150                 release_mem_region((unsigned long) base, size);
151         else
152                 release_region((unsigned long) base, size);
153 }
154 EXPORT_SYMBOL(of_iounmap);
155
156 static int node_match(struct device *dev, void *data)
157 {
158         struct of_device *op = to_of_device(dev);
159         struct device_node *dp = data;
160
161         return (op->node == dp);
162 }
163
164 struct of_device *of_find_device_by_node(struct device_node *dp)
165 {
166         struct device *dev = bus_find_device(&of_bus_type, NULL,
167                                              dp, node_match);
168
169         if (dev)
170                 return to_of_device(dev);
171
172         return NULL;
173 }
174 EXPORT_SYMBOL(of_find_device_by_node);
175
176 #ifdef CONFIG_PCI
177 struct bus_type isa_bus_type = {
178        .name    = "isa",
179        .match   = of_platform_bus_match,
180        .probe   = of_device_probe,
181        .remove  = of_device_remove,
182        .suspend = of_device_suspend,
183        .resume  = of_device_resume,
184 };
185 EXPORT_SYMBOL(isa_bus_type);
186
187 struct bus_type ebus_bus_type = {
188        .name    = "ebus",
189        .match   = of_platform_bus_match,
190        .probe   = of_device_probe,
191        .remove  = of_device_remove,
192        .suspend = of_device_suspend,
193        .resume  = of_device_resume,
194 };
195 EXPORT_SYMBOL(ebus_bus_type);
196 #endif
197
198 #ifdef CONFIG_SBUS
199 struct bus_type sbus_bus_type = {
200        .name    = "sbus",
201        .match   = of_platform_bus_match,
202        .probe   = of_device_probe,
203        .remove  = of_device_remove,
204        .suspend = of_device_suspend,
205        .resume  = of_device_resume,
206 };
207 EXPORT_SYMBOL(sbus_bus_type);
208 #endif
209
210 struct bus_type of_bus_type = {
211        .name    = "of",
212        .match   = of_platform_bus_match,
213        .probe   = of_device_probe,
214        .remove  = of_device_remove,
215        .suspend = of_device_suspend,
216        .resume  = of_device_resume,
217 };
218 EXPORT_SYMBOL(of_bus_type);
219
220 static inline u64 of_read_addr(const u32 *cell, int size)
221 {
222         u64 r = 0;
223         while (size--)
224                 r = (r << 32) | *(cell++);
225         return r;
226 }
227
228 static void __init get_cells(struct device_node *dp,
229                              int *addrc, int *sizec)
230 {
231         if (addrc)
232                 *addrc = of_n_addr_cells(dp);
233         if (sizec)
234                 *sizec = of_n_size_cells(dp);
235 }
236
237 /* Max address size we deal with */
238 #define OF_MAX_ADDR_CELLS       4
239
240 struct of_bus {
241         const char      *name;
242         const char      *addr_prop_name;
243         int             (*match)(struct device_node *parent);
244         void            (*count_cells)(struct device_node *child,
245                                        int *addrc, int *sizec);
246         int             (*map)(u32 *addr, const u32 *range,
247                                int na, int ns, int pna);
248         unsigned int    (*get_flags)(u32 *addr);
249 };
250
251 /*
252  * Default translator (generic bus)
253  */
254
255 static void of_bus_default_count_cells(struct device_node *dev,
256                                        int *addrc, int *sizec)
257 {
258         get_cells(dev, addrc, sizec);
259 }
260
261 /* Make sure the least significant 64-bits are in-range.  Even
262  * for 3 or 4 cell values it is a good enough approximation.
263  */
264 static int of_out_of_range(const u32 *addr, const u32 *base,
265                            const u32 *size, int na, int ns)
266 {
267         u64 a = of_read_addr(addr, na);
268         u64 b = of_read_addr(base, na);
269
270         if (a < b)
271                 return 1;
272
273         b += of_read_addr(size, ns);
274         if (a >= b)
275                 return 1;
276
277         return 0;
278 }
279
280 static int of_bus_default_map(u32 *addr, const u32 *range,
281                               int na, int ns, int pna)
282 {
283         u32 result[OF_MAX_ADDR_CELLS];
284         int i;
285
286         if (ns > 2) {
287                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
288                 return -EINVAL;
289         }
290
291         if (of_out_of_range(addr, range, range + na + pna, na, ns))
292                 return -EINVAL;
293
294         /* Start with the parent range base.  */
295         memcpy(result, range + na, pna * 4);
296
297         /* Add in the child address offset.  */
298         for (i = 0; i < na; i++)
299                 result[pna - 1 - i] +=
300                         (addr[na - 1 - i] -
301                          range[na - 1 - i]);
302
303         memcpy(addr, result, pna * 4);
304
305         return 0;
306 }
307
308 static unsigned int of_bus_default_get_flags(u32 *addr)
309 {
310         return IORESOURCE_MEM;
311 }
312
313 /*
314  * PCI bus specific translator
315  */
316
317 static int of_bus_pci_match(struct device_node *np)
318 {
319         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
320                 /* Do not do PCI specific frobbing if the
321                  * PCI bridge lacks a ranges property.  We
322                  * want to pass it through up to the next
323                  * parent as-is, not with the PCI translate
324                  * method which chops off the top address cell.
325                  */
326                 if (!of_find_property(np, "ranges", NULL))
327                         return 0;
328
329                 return 1;
330         }
331
332         return 0;
333 }
334
335 static void of_bus_pci_count_cells(struct device_node *np,
336                                    int *addrc, int *sizec)
337 {
338         if (addrc)
339                 *addrc = 3;
340         if (sizec)
341                 *sizec = 2;
342 }
343
344 static int of_bus_pci_map(u32 *addr, const u32 *range,
345                           int na, int ns, int pna)
346 {
347         u32 result[OF_MAX_ADDR_CELLS];
348         int i;
349
350         /* Check address type match */
351         if ((addr[0] ^ range[0]) & 0x03000000)
352                 return -EINVAL;
353
354         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
355                             na - 1, ns))
356                 return -EINVAL;
357
358         /* Start with the parent range base.  */
359         memcpy(result, range + na, pna * 4);
360
361         /* Add in the child address offset, skipping high cell.  */
362         for (i = 0; i < na - 1; i++)
363                 result[pna - 1 - i] +=
364                         (addr[na - 1 - i] -
365                          range[na - 1 - i]);
366
367         memcpy(addr, result, pna * 4);
368
369         return 0;
370 }
371
372 static unsigned int of_bus_pci_get_flags(u32 *addr)
373 {
374         unsigned int flags = 0;
375         u32 w = addr[0];
376
377         switch((w >> 24) & 0x03) {
378         case 0x01:
379                 flags |= IORESOURCE_IO;
380         case 0x02: /* 32 bits */
381         case 0x03: /* 64 bits */
382                 flags |= IORESOURCE_MEM;
383         }
384         if (w & 0x40000000)
385                 flags |= IORESOURCE_PREFETCH;
386         return flags;
387 }
388
389 /*
390  * SBUS bus specific translator
391  */
392
393 static int of_bus_sbus_match(struct device_node *np)
394 {
395         return !strcmp(np->name, "sbus") ||
396                 !strcmp(np->name, "sbi");
397 }
398
399 static void of_bus_sbus_count_cells(struct device_node *child,
400                                    int *addrc, int *sizec)
401 {
402         if (addrc)
403                 *addrc = 2;
404         if (sizec)
405                 *sizec = 1;
406 }
407
408 /*
409  * FHC/Central bus specific translator.
410  *
411  * This is just needed to hard-code the address and size cell
412  * counts.  'fhc' and 'central' nodes lack the #address-cells and
413  * #size-cells properties, and if you walk to the root on such
414  * Enterprise boxes all you'll get is a #size-cells of 2 which is
415  * not what we want to use.
416  */
417 static int of_bus_fhc_match(struct device_node *np)
418 {
419         return !strcmp(np->name, "fhc") ||
420                 !strcmp(np->name, "central");
421 }
422
423 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
424
425 /*
426  * Array of bus specific translators
427  */
428
429 static struct of_bus of_busses[] = {
430         /* PCI */
431         {
432                 .name = "pci",
433                 .addr_prop_name = "assigned-addresses",
434                 .match = of_bus_pci_match,
435                 .count_cells = of_bus_pci_count_cells,
436                 .map = of_bus_pci_map,
437                 .get_flags = of_bus_pci_get_flags,
438         },
439         /* SBUS */
440         {
441                 .name = "sbus",
442                 .addr_prop_name = "reg",
443                 .match = of_bus_sbus_match,
444                 .count_cells = of_bus_sbus_count_cells,
445                 .map = of_bus_default_map,
446                 .get_flags = of_bus_default_get_flags,
447         },
448         /* FHC */
449         {
450                 .name = "fhc",
451                 .addr_prop_name = "reg",
452                 .match = of_bus_fhc_match,
453                 .count_cells = of_bus_fhc_count_cells,
454                 .map = of_bus_default_map,
455                 .get_flags = of_bus_default_get_flags,
456         },
457         /* Default */
458         {
459                 .name = "default",
460                 .addr_prop_name = "reg",
461                 .match = NULL,
462                 .count_cells = of_bus_default_count_cells,
463                 .map = of_bus_default_map,
464                 .get_flags = of_bus_default_get_flags,
465         },
466 };
467
468 static struct of_bus *of_match_bus(struct device_node *np)
469 {
470         int i;
471
472         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
473                 if (!of_busses[i].match || of_busses[i].match(np))
474                         return &of_busses[i];
475         BUG();
476         return NULL;
477 }
478
479 static int __init build_one_resource(struct device_node *parent,
480                                      struct of_bus *bus,
481                                      struct of_bus *pbus,
482                                      u32 *addr,
483                                      int na, int ns, int pna)
484 {
485         u32 *ranges;
486         unsigned int rlen;
487         int rone;
488
489         ranges = of_get_property(parent, "ranges", &rlen);
490         if (ranges == NULL || rlen == 0) {
491                 u32 result[OF_MAX_ADDR_CELLS];
492                 int i;
493
494                 memset(result, 0, pna * 4);
495                 for (i = 0; i < na; i++)
496                         result[pna - 1 - i] =
497                                 addr[na - 1 - i];
498
499                 memcpy(addr, result, pna * 4);
500                 return 0;
501         }
502
503         /* Now walk through the ranges */
504         rlen /= 4;
505         rone = na + pna + ns;
506         for (; rlen >= rone; rlen -= rone, ranges += rone) {
507                 if (!bus->map(addr, ranges, na, ns, pna))
508                         return 0;
509         }
510
511         return 1;
512 }
513
514 static int __init use_1to1_mapping(struct device_node *pp)
515 {
516         char *model;
517
518         /* If this is on the PMU bus, don't try to translate it even
519          * if a ranges property exists.
520          */
521         if (!strcmp(pp->name, "pmu"))
522                 return 1;
523
524         /* If we have a ranges property in the parent, use it.  */
525         if (of_find_property(pp, "ranges", NULL) != NULL)
526                 return 0;
527
528         /* If the parent is the dma node of an ISA bus, pass
529          * the translation up to the root.
530          */
531         if (!strcmp(pp->name, "dma"))
532                 return 0;
533
534         /* Similarly for Simba PCI bridges.  */
535         model = of_get_property(pp, "model", NULL);
536         if (model && !strcmp(model, "SUNW,simba"))
537                 return 0;
538
539         return 1;
540 }
541
542 static int of_resource_verbose;
543
544 static void __init build_device_resources(struct of_device *op,
545                                           struct device *parent)
546 {
547         struct of_device *p_op;
548         struct of_bus *bus;
549         int na, ns;
550         int index, num_reg;
551         void *preg;
552
553         if (!parent)
554                 return;
555
556         p_op = to_of_device(parent);
557         bus = of_match_bus(p_op->node);
558         bus->count_cells(op->node, &na, &ns);
559
560         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
561         if (!preg || num_reg == 0)
562                 return;
563
564         /* Convert to num-cells.  */
565         num_reg /= 4;
566
567         /* Convert to num-entries.  */
568         num_reg /= na + ns;
569
570         /* Prevent overruning the op->resources[] array.  */
571         if (num_reg > PROMREG_MAX) {
572                 printk(KERN_WARNING "%s: Too many regs (%d), "
573                        "limiting to %d.\n",
574                        op->node->full_name, num_reg, PROMREG_MAX);
575                 num_reg = PROMREG_MAX;
576         }
577
578         for (index = 0; index < num_reg; index++) {
579                 struct resource *r = &op->resource[index];
580                 u32 addr[OF_MAX_ADDR_CELLS];
581                 u32 *reg = (preg + (index * ((na + ns) * 4)));
582                 struct device_node *dp = op->node;
583                 struct device_node *pp = p_op->node;
584                 struct of_bus *pbus;
585                 u64 size, result = OF_BAD_ADDR;
586                 unsigned long flags;
587                 int dna, dns;
588                 int pna, pns;
589
590                 size = of_read_addr(reg + na, ns);
591                 flags = bus->get_flags(reg);
592
593                 memcpy(addr, reg, na * 4);
594
595                 if (use_1to1_mapping(pp)) {
596                         result = of_read_addr(addr, na);
597                         goto build_res;
598                 }
599
600                 dna = na;
601                 dns = ns;
602
603                 while (1) {
604                         dp = pp;
605                         pp = dp->parent;
606                         if (!pp) {
607                                 result = of_read_addr(addr, dna);
608                                 break;
609                         }
610
611                         pbus = of_match_bus(pp);
612                         pbus->count_cells(dp, &pna, &pns);
613
614                         if (build_one_resource(dp, bus, pbus, addr,
615                                                dna, dns, pna))
616                                 break;
617
618                         dna = pna;
619                         dns = pns;
620                         bus = pbus;
621                 }
622
623         build_res:
624                 memset(r, 0, sizeof(*r));
625
626                 if (of_resource_verbose)
627                         printk("%s reg[%d] -> %lx\n",
628                                op->node->full_name, index,
629                                result);
630
631                 if (result != OF_BAD_ADDR) {
632                         if (tlb_type == hypervisor)
633                                 result &= 0x0fffffffffffffffUL;
634
635                         r->start = result;
636                         r->end = result + size - 1;
637                         r->flags = flags;
638                 } else {
639                         r->start = ~0UL;
640                         r->end = ~0UL;
641                 }
642                 r->name = op->node->name;
643         }
644 }
645
646 static struct device_node * __init
647 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
648                     u32 *imap, int imlen, u32 *imask,
649                     unsigned int *irq_p)
650 {
651         struct device_node *cp;
652         unsigned int irq = *irq_p;
653         struct of_bus *bus;
654         phandle handle;
655         u32 *reg;
656         int na, num_reg, i;
657
658         bus = of_match_bus(pp);
659         bus->count_cells(dp, &na, NULL);
660
661         reg = of_get_property(dp, "reg", &num_reg);
662         if (!reg || !num_reg)
663                 return NULL;
664
665         imlen /= ((na + 3) * 4);
666         handle = 0;
667         for (i = 0; i < imlen; i++) {
668                 int j;
669
670                 for (j = 0; j < na; j++) {
671                         if ((reg[j] & imask[j]) != imap[j])
672                                 goto next;
673                 }
674                 if (imap[na] == irq) {
675                         handle = imap[na + 1];
676                         irq = imap[na + 2];
677                         break;
678                 }
679
680         next:
681                 imap += (na + 3);
682         }
683         if (i == imlen) {
684                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
685                  * properties that do not include the on-board device
686                  * interrupts.  Instead, the device's 'interrupts' property
687                  * is already a fully specified INO value.
688                  *
689                  * Handle this by deciding that, if we didn't get a
690                  * match in the parent's 'interrupt-map', and the
691                  * parent is an IRQ translater, then use the parent as
692                  * our IRQ controller.
693                  */
694                 if (pp->irq_trans)
695                         return pp;
696
697                 return NULL;
698         }
699
700         *irq_p = irq;
701         cp = of_find_node_by_phandle(handle);
702
703         return cp;
704 }
705
706 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
707                                            struct device_node *pp,
708                                            unsigned int irq)
709 {
710         struct linux_prom_pci_registers *regs;
711         unsigned int devfn, slot, ret;
712
713         if (irq < 1 || irq > 4)
714                 return irq;
715
716         regs = of_get_property(dp, "reg", NULL);
717         if (!regs)
718                 return irq;
719
720         devfn = (regs->phys_hi >> 8) & 0xff;
721         slot = (devfn >> 3) & 0x1f;
722
723         ret = ((irq - 1 + (slot & 3)) & 3) + 1;
724
725         return ret;
726 }
727
728 static int of_irq_verbose;
729
730 static unsigned int __init build_one_device_irq(struct of_device *op,
731                                                 struct device *parent,
732                                                 unsigned int irq)
733 {
734         struct device_node *dp = op->node;
735         struct device_node *pp, *ip;
736         unsigned int orig_irq = irq;
737
738         if (irq == 0xffffffff)
739                 return irq;
740
741         if (dp->irq_trans) {
742                 irq = dp->irq_trans->irq_build(dp, irq,
743                                                dp->irq_trans->data);
744
745                 if (of_irq_verbose)
746                         printk("%s: direct translate %x --> %x\n",
747                                dp->full_name, orig_irq, irq);
748
749                 return irq;
750         }
751
752         /* Something more complicated.  Walk up to the root, applying
753          * interrupt-map or bus specific translations, until we hit
754          * an IRQ translator.
755          *
756          * If we hit a bus type or situation we cannot handle, we
757          * stop and assume that the original IRQ number was in a
758          * format which has special meaning to it's immediate parent.
759          */
760         pp = dp->parent;
761         ip = NULL;
762         while (pp) {
763                 void *imap, *imsk;
764                 int imlen;
765
766                 imap = of_get_property(pp, "interrupt-map", &imlen);
767                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
768                 if (imap && imsk) {
769                         struct device_node *iret;
770                         int this_orig_irq = irq;
771
772                         iret = apply_interrupt_map(dp, pp,
773                                                    imap, imlen, imsk,
774                                                    &irq);
775
776                         if (of_irq_verbose)
777                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
778                                        op->node->full_name,
779                                        pp->full_name, this_orig_irq,
780                                        (iret ? iret->full_name : "NULL"), irq);
781
782                         if (!iret)
783                                 break;
784
785                         if (iret->irq_trans) {
786                                 ip = iret;
787                                 break;
788                         }
789                 } else {
790                         if (!strcmp(pp->type, "pci") ||
791                             !strcmp(pp->type, "pciex")) {
792                                 unsigned int this_orig_irq = irq;
793
794                                 irq = pci_irq_swizzle(dp, pp, irq);
795                                 if (of_irq_verbose)
796                                         printk("%s: PCI swizzle [%s] "
797                                                "%x --> %x\n",
798                                                op->node->full_name,
799                                                pp->full_name, this_orig_irq,
800                                                irq);
801
802                         }
803
804                         if (pp->irq_trans) {
805                                 ip = pp;
806                                 break;
807                         }
808                 }
809                 dp = pp;
810                 pp = pp->parent;
811         }
812         if (!ip)
813                 return orig_irq;
814
815         irq = ip->irq_trans->irq_build(op->node, irq,
816                                        ip->irq_trans->data);
817         if (of_irq_verbose)
818                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
819                        op->node->full_name, ip->full_name, orig_irq, irq);
820
821         return irq;
822 }
823
824 static struct of_device * __init scan_one_device(struct device_node *dp,
825                                                  struct device *parent)
826 {
827         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
828         unsigned int *irq;
829         int len, i;
830
831         if (!op)
832                 return NULL;
833
834         op->node = dp;
835
836         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
837                                                (25*1000*1000));
838         op->portid = of_getintprop_default(dp, "upa-portid", -1);
839         if (op->portid == -1)
840                 op->portid = of_getintprop_default(dp, "portid", -1);
841
842         irq = of_get_property(dp, "interrupts", &len);
843         if (irq) {
844                 memcpy(op->irqs, irq, len);
845                 op->num_irqs = len / 4;
846         } else {
847                 op->num_irqs = 0;
848         }
849
850         /* Prevent overruning the op->irqs[] array.  */
851         if (op->num_irqs > PROMINTR_MAX) {
852                 printk(KERN_WARNING "%s: Too many irqs (%d), "
853                        "limiting to %d.\n",
854                        dp->full_name, op->num_irqs, PROMINTR_MAX);
855                 op->num_irqs = PROMINTR_MAX;
856         }
857
858         build_device_resources(op, parent);
859         for (i = 0; i < op->num_irqs; i++)
860                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
861
862         op->dev.parent = parent;
863         op->dev.bus = &of_bus_type;
864         if (!parent)
865                 strcpy(op->dev.bus_id, "root");
866         else
867                 sprintf(op->dev.bus_id, "%08x", dp->node);
868
869         if (of_device_register(op)) {
870                 printk("%s: Could not register of device.\n",
871                        dp->full_name);
872                 kfree(op);
873                 op = NULL;
874         }
875
876         return op;
877 }
878
879 static void __init scan_tree(struct device_node *dp, struct device *parent)
880 {
881         while (dp) {
882                 struct of_device *op = scan_one_device(dp, parent);
883
884                 if (op)
885                         scan_tree(dp->child, &op->dev);
886
887                 dp = dp->sibling;
888         }
889 }
890
891 static void __init scan_of_devices(void)
892 {
893         struct device_node *root = of_find_node_by_path("/");
894         struct of_device *parent;
895
896         parent = scan_one_device(root, NULL);
897         if (!parent)
898                 return;
899
900         scan_tree(root->child, &parent->dev);
901 }
902
903 static int __init of_bus_driver_init(void)
904 {
905         int err;
906
907         err = bus_register(&of_bus_type);
908 #ifdef CONFIG_PCI
909         if (!err)
910                 err = bus_register(&isa_bus_type);
911         if (!err)
912                 err = bus_register(&ebus_bus_type);
913 #endif
914 #ifdef CONFIG_SBUS
915         if (!err)
916                 err = bus_register(&sbus_bus_type);
917 #endif
918
919         if (!err)
920                 scan_of_devices();
921
922         return err;
923 }
924
925 postcore_initcall(of_bus_driver_init);
926
927 static int __init of_debug(char *str)
928 {
929         int val = 0;
930
931         get_option(&str, &val);
932         if (val & 1)
933                 of_resource_verbose = 1;
934         if (val & 2)
935                 of_irq_verbose = 1;
936         return 1;
937 }
938
939 __setup("of_debug=", of_debug);
940
941 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
942 {
943         /* initialize common driver fields */
944         drv->driver.name = drv->name;
945         drv->driver.bus = bus;
946
947         /* register with core */
948         return driver_register(&drv->driver);
949 }
950
951 void of_unregister_driver(struct of_platform_driver *drv)
952 {
953         driver_unregister(&drv->driver);
954 }
955
956
957 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
958 {
959         struct of_device *ofdev;
960
961         ofdev = to_of_device(dev);
962         return sprintf(buf, "%s", ofdev->node->full_name);
963 }
964
965 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
966
967 /**
968  * of_release_dev - free an of device structure when all users of it are finished.
969  * @dev: device that's been disconnected
970  *
971  * Will be called only by the device core when all users of this of device are
972  * done.
973  */
974 void of_release_dev(struct device *dev)
975 {
976         struct of_device *ofdev;
977
978         ofdev = to_of_device(dev);
979
980         kfree(ofdev);
981 }
982
983 int of_device_register(struct of_device *ofdev)
984 {
985         int rc;
986
987         BUG_ON(ofdev->node == NULL);
988
989         rc = device_register(&ofdev->dev);
990         if (rc)
991                 return rc;
992
993         rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
994         if (rc)
995                 device_unregister(&ofdev->dev);
996
997         return rc;
998 }
999
1000 void of_device_unregister(struct of_device *ofdev)
1001 {
1002         device_remove_file(&ofdev->dev, &dev_attr_devspec);
1003         device_unregister(&ofdev->dev);
1004 }
1005
1006 struct of_device* of_platform_device_create(struct device_node *np,
1007                                             const char *bus_id,
1008                                             struct device *parent,
1009                                             struct bus_type *bus)
1010 {
1011         struct of_device *dev;
1012
1013         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1014         if (!dev)
1015                 return NULL;
1016
1017         dev->dev.parent = parent;
1018         dev->dev.bus = bus;
1019         dev->dev.release = of_release_dev;
1020
1021         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
1022
1023         if (of_device_register(dev) != 0) {
1024                 kfree(dev);
1025                 return NULL;
1026         }
1027
1028         return dev;
1029 }
1030
1031 EXPORT_SYMBOL(of_match_device);
1032 EXPORT_SYMBOL(of_register_driver);
1033 EXPORT_SYMBOL(of_unregister_driver);
1034 EXPORT_SYMBOL(of_device_register);
1035 EXPORT_SYMBOL(of_device_unregister);
1036 EXPORT_SYMBOL(of_dev_get);
1037 EXPORT_SYMBOL(of_dev_put);
1038 EXPORT_SYMBOL(of_platform_device_create);
1039 EXPORT_SYMBOL(of_release_dev);