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1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/of.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/slab.h>
8
9 #include <asm/errno.h>
10 #include <asm/of_device.h>
11
12 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
13 {
14         struct of_device * of_dev = to_of_device(dev);
15         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
16         const struct of_device_id * matches = of_drv->match_table;
17
18         if (!matches)
19                 return 0;
20
21         return of_match_device(matches, of_dev) != NULL;
22 }
23
24 static int of_platform_device_probe(struct device *dev)
25 {
26         int error = -ENODEV;
27         struct of_platform_driver *drv;
28         struct of_device *of_dev;
29         const struct of_device_id *match;
30
31         drv = to_of_platform_driver(dev->driver);
32         of_dev = to_of_device(dev);
33
34         if (!drv->probe)
35                 return error;
36
37         of_dev_get(of_dev);
38
39         match = of_match_device(drv->match_table, of_dev);
40         if (match)
41                 error = drv->probe(of_dev, match);
42         if (error)
43                 of_dev_put(of_dev);
44
45         return error;
46 }
47
48 static int of_platform_device_remove(struct device *dev)
49 {
50         struct of_device * of_dev = to_of_device(dev);
51         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
52
53         if (dev->driver && drv->remove)
54                 drv->remove(of_dev);
55         return 0;
56 }
57
58 static int of_platform_device_suspend(struct device *dev, pm_message_t state)
59 {
60         struct of_device * of_dev = to_of_device(dev);
61         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
62         int error = 0;
63
64         if (dev->driver && drv->suspend)
65                 error = drv->suspend(of_dev, state);
66         return error;
67 }
68
69 static int of_platform_device_resume(struct device * dev)
70 {
71         struct of_device * of_dev = to_of_device(dev);
72         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
73         int error = 0;
74
75         if (dev->driver && drv->resume)
76                 error = drv->resume(of_dev);
77         return error;
78 }
79
80 static int node_match(struct device *dev, void *data)
81 {
82         struct of_device *op = to_of_device(dev);
83         struct device_node *dp = data;
84
85         return (op->node == dp);
86 }
87
88 struct of_device *of_find_device_by_node(struct device_node *dp)
89 {
90         struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
91                                              dp, node_match);
92
93         if (dev)
94                 return to_of_device(dev);
95
96         return NULL;
97 }
98 EXPORT_SYMBOL(of_find_device_by_node);
99
100 #ifdef CONFIG_PCI
101 struct bus_type ebus_bus_type = {
102        .name    = "ebus",
103        .match   = of_platform_bus_match,
104        .probe   = of_platform_device_probe,
105        .remove  = of_platform_device_remove,
106        .suspend = of_platform_device_suspend,
107        .resume  = of_platform_device_resume,
108 };
109 EXPORT_SYMBOL(ebus_bus_type);
110 #endif
111
112 #ifdef CONFIG_SBUS
113 struct bus_type sbus_bus_type = {
114        .name    = "sbus",
115        .match   = of_platform_bus_match,
116        .probe   = of_platform_device_probe,
117        .remove  = of_platform_device_remove,
118        .suspend = of_platform_device_suspend,
119        .resume  = of_platform_device_resume,
120 };
121 EXPORT_SYMBOL(sbus_bus_type);
122 #endif
123
124 struct bus_type of_platform_bus_type = {
125        .name    = "of",
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 inline u64 of_read_addr(const u32 *cell, int size)
135 {
136         u64 r = 0;
137         while (size--)
138                 r = (r << 32) | *(cell++);
139         return r;
140 }
141
142 static void __init get_cells(struct device_node *dp,
143                              int *addrc, int *sizec)
144 {
145         if (addrc)
146                 *addrc = of_n_addr_cells(dp);
147         if (sizec)
148                 *sizec = of_n_size_cells(dp);
149 }
150
151 /* Max address size we deal with */
152 #define OF_MAX_ADDR_CELLS       4
153
154 struct of_bus {
155         const char      *name;
156         const char      *addr_prop_name;
157         int             (*match)(struct device_node *parent);
158         void            (*count_cells)(struct device_node *child,
159                                        int *addrc, int *sizec);
160         int             (*map)(u32 *addr, const u32 *range,
161                                int na, int ns, int pna);
162         unsigned int    (*get_flags)(const u32 *addr);
163 };
164
165 /*
166  * Default translator (generic bus)
167  */
168
169 static void of_bus_default_count_cells(struct device_node *dev,
170                                        int *addrc, int *sizec)
171 {
172         get_cells(dev, addrc, sizec);
173 }
174
175 /* Make sure the least significant 64-bits are in-range.  Even
176  * for 3 or 4 cell values it is a good enough approximation.
177  */
178 static int of_out_of_range(const u32 *addr, const u32 *base,
179                            const u32 *size, int na, int ns)
180 {
181         u64 a = of_read_addr(addr, na);
182         u64 b = of_read_addr(base, na);
183
184         if (a < b)
185                 return 1;
186
187         b += of_read_addr(size, ns);
188         if (a >= b)
189                 return 1;
190
191         return 0;
192 }
193
194 static int of_bus_default_map(u32 *addr, const u32 *range,
195                               int na, int ns, int pna)
196 {
197         u32 result[OF_MAX_ADDR_CELLS];
198         int i;
199
200         if (ns > 2) {
201                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
202                 return -EINVAL;
203         }
204
205         if (of_out_of_range(addr, range, range + na + pna, na, ns))
206                 return -EINVAL;
207
208         /* Start with the parent range base.  */
209         memcpy(result, range + na, pna * 4);
210
211         /* Add in the child address offset.  */
212         for (i = 0; i < na; i++)
213                 result[pna - 1 - i] +=
214                         (addr[na - 1 - i] -
215                          range[na - 1 - i]);
216
217         memcpy(addr, result, pna * 4);
218
219         return 0;
220 }
221
222 static unsigned int of_bus_default_get_flags(const u32 *addr)
223 {
224         return IORESOURCE_MEM;
225 }
226
227 /*
228  * PCI bus specific translator
229  */
230
231 static int of_bus_pci_match(struct device_node *np)
232 {
233         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
234                 /* Do not do PCI specific frobbing if the
235                  * PCI bridge lacks a ranges property.  We
236                  * want to pass it through up to the next
237                  * parent as-is, not with the PCI translate
238                  * method which chops off the top address cell.
239                  */
240                 if (!of_find_property(np, "ranges", NULL))
241                         return 0;
242
243                 return 1;
244         }
245
246         return 0;
247 }
248
249 static void of_bus_pci_count_cells(struct device_node *np,
250                                    int *addrc, int *sizec)
251 {
252         if (addrc)
253                 *addrc = 3;
254         if (sizec)
255                 *sizec = 2;
256 }
257
258 static int of_bus_pci_map(u32 *addr, const u32 *range,
259                           int na, int ns, int pna)
260 {
261         u32 result[OF_MAX_ADDR_CELLS];
262         int i;
263
264         /* Check address type match */
265         if ((addr[0] ^ range[0]) & 0x03000000)
266                 return -EINVAL;
267
268         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
269                             na - 1, ns))
270                 return -EINVAL;
271
272         /* Start with the parent range base.  */
273         memcpy(result, range + na, pna * 4);
274
275         /* Add in the child address offset, skipping high cell.  */
276         for (i = 0; i < na - 1; i++)
277                 result[pna - 1 - i] +=
278                         (addr[na - 1 - i] -
279                          range[na - 1 - i]);
280
281         memcpy(addr, result, pna * 4);
282
283         return 0;
284 }
285
286 static unsigned int of_bus_pci_get_flags(const u32 *addr)
287 {
288         unsigned int flags = 0;
289         u32 w = addr[0];
290
291         switch((w >> 24) & 0x03) {
292         case 0x01:
293                 flags |= IORESOURCE_IO;
294         case 0x02: /* 32 bits */
295         case 0x03: /* 64 bits */
296                 flags |= IORESOURCE_MEM;
297         }
298         if (w & 0x40000000)
299                 flags |= IORESOURCE_PREFETCH;
300         return flags;
301 }
302
303 /*
304  * SBUS bus specific translator
305  */
306
307 static int of_bus_sbus_match(struct device_node *np)
308 {
309         return !strcmp(np->name, "sbus") ||
310                 !strcmp(np->name, "sbi");
311 }
312
313 static void of_bus_sbus_count_cells(struct device_node *child,
314                                    int *addrc, int *sizec)
315 {
316         if (addrc)
317                 *addrc = 2;
318         if (sizec)
319                 *sizec = 1;
320 }
321
322 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
323 {
324         return of_bus_default_map(addr, range, na, ns, pna);
325 }
326
327 static unsigned int of_bus_sbus_get_flags(const u32 *addr)
328 {
329         return IORESOURCE_MEM;
330 }
331
332
333 /*
334  * Array of bus specific translators
335  */
336
337 static struct of_bus of_busses[] = {
338         /* PCI */
339         {
340                 .name = "pci",
341                 .addr_prop_name = "assigned-addresses",
342                 .match = of_bus_pci_match,
343                 .count_cells = of_bus_pci_count_cells,
344                 .map = of_bus_pci_map,
345                 .get_flags = of_bus_pci_get_flags,
346         },
347         /* SBUS */
348         {
349                 .name = "sbus",
350                 .addr_prop_name = "reg",
351                 .match = of_bus_sbus_match,
352                 .count_cells = of_bus_sbus_count_cells,
353                 .map = of_bus_sbus_map,
354                 .get_flags = of_bus_sbus_get_flags,
355         },
356         /* Default */
357         {
358                 .name = "default",
359                 .addr_prop_name = "reg",
360                 .match = NULL,
361                 .count_cells = of_bus_default_count_cells,
362                 .map = of_bus_default_map,
363                 .get_flags = of_bus_default_get_flags,
364         },
365 };
366
367 static struct of_bus *of_match_bus(struct device_node *np)
368 {
369         int i;
370
371         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
372                 if (!of_busses[i].match || of_busses[i].match(np))
373                         return &of_busses[i];
374         BUG();
375         return NULL;
376 }
377
378 static int __init build_one_resource(struct device_node *parent,
379                                      struct of_bus *bus,
380                                      struct of_bus *pbus,
381                                      u32 *addr,
382                                      int na, int ns, int pna)
383 {
384         const u32 *ranges;
385         unsigned int rlen;
386         int rone;
387
388         ranges = of_get_property(parent, "ranges", &rlen);
389         if (ranges == NULL || rlen == 0) {
390                 u32 result[OF_MAX_ADDR_CELLS];
391                 int i;
392
393                 memset(result, 0, pna * 4);
394                 for (i = 0; i < na; i++)
395                         result[pna - 1 - i] =
396                                 addr[na - 1 - i];
397
398                 memcpy(addr, result, pna * 4);
399                 return 0;
400         }
401
402         /* Now walk through the ranges */
403         rlen /= 4;
404         rone = na + pna + ns;
405         for (; rlen >= rone; rlen -= rone, ranges += rone) {
406                 if (!bus->map(addr, ranges, na, ns, pna))
407                         return 0;
408         }
409
410         return 1;
411 }
412
413 static int of_resource_verbose;
414
415 static void __init build_device_resources(struct of_device *op,
416                                           struct device *parent)
417 {
418         struct of_device *p_op;
419         struct of_bus *bus;
420         int na, ns;
421         int index, num_reg;
422         const void *preg;
423
424         if (!parent)
425                 return;
426
427         p_op = to_of_device(parent);
428         bus = of_match_bus(p_op->node);
429         bus->count_cells(op->node, &na, &ns);
430
431         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
432         if (!preg || num_reg == 0)
433                 return;
434
435         /* Convert to num-cells.  */
436         num_reg /= 4;
437
438         /* Conver to num-entries.  */
439         num_reg /= na + ns;
440
441         for (index = 0; index < num_reg; index++) {
442                 struct resource *r = &op->resource[index];
443                 u32 addr[OF_MAX_ADDR_CELLS];
444                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
445                 struct device_node *dp = op->node;
446                 struct device_node *pp = p_op->node;
447                 struct of_bus *pbus, *dbus;
448                 u64 size, result = OF_BAD_ADDR;
449                 unsigned long flags;
450                 int dna, dns;
451                 int pna, pns;
452
453                 size = of_read_addr(reg + na, ns);
454                 flags = bus->get_flags(reg);
455
456                 memcpy(addr, reg, na * 4);
457
458                 /* If the immediate parent has no ranges property to apply,
459                  * just use a 1<->1 mapping.
460                  */
461                 if (of_find_property(pp, "ranges", NULL) == NULL) {
462                         result = of_read_addr(addr, na);
463                         goto build_res;
464                 }
465
466                 dna = na;
467                 dns = ns;
468                 dbus = bus;
469
470                 while (1) {
471                         dp = pp;
472                         pp = dp->parent;
473                         if (!pp) {
474                                 result = of_read_addr(addr, dna);
475                                 break;
476                         }
477
478                         pbus = of_match_bus(pp);
479                         pbus->count_cells(dp, &pna, &pns);
480
481                         if (build_one_resource(dp, dbus, pbus, addr,
482                                                dna, dns, pna))
483                                 break;
484
485                         dna = pna;
486                         dns = pns;
487                         dbus = pbus;
488                 }
489
490         build_res:
491                 memset(r, 0, sizeof(*r));
492
493                 if (of_resource_verbose)
494                         printk("%s reg[%d] -> %llx\n",
495                                op->node->full_name, index,
496                                result);
497
498                 if (result != OF_BAD_ADDR) {
499                         r->start = result & 0xffffffff;
500                         r->end = result + size - 1;
501                         r->flags = flags | ((result >> 32ULL) & 0xffUL);
502                 }
503                 r->name = op->node->name;
504         }
505 }
506
507 static struct of_device * __init scan_one_device(struct device_node *dp,
508                                                  struct device *parent)
509 {
510         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
511         const struct linux_prom_irqs *intr;
512         int len, i;
513
514         if (!op)
515                 return NULL;
516
517         op->node = dp;
518
519         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
520                                                (25*1000*1000));
521         op->portid = of_getintprop_default(dp, "upa-portid", -1);
522         if (op->portid == -1)
523                 op->portid = of_getintprop_default(dp, "portid", -1);
524
525         intr = of_get_property(dp, "intr", &len);
526         if (intr) {
527                 op->num_irqs = len / sizeof(struct linux_prom_irqs);
528                 for (i = 0; i < op->num_irqs; i++)
529                         op->irqs[i] = intr[i].pri;
530         } else {
531                 const unsigned int *irq =
532                         of_get_property(dp, "interrupts", &len);
533
534                 if (irq) {
535                         op->num_irqs = len / sizeof(unsigned int);
536                         for (i = 0; i < op->num_irqs; i++)
537                                 op->irqs[i] = irq[i];
538                 } else {
539                         op->num_irqs = 0;
540                 }
541         }
542         if (sparc_cpu_model == sun4d) {
543                 static int pil_to_sbus[] = {
544                         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
545                 };
546                 struct device_node *io_unit, *sbi = dp->parent;
547                 const struct linux_prom_registers *regs;
548                 int board, slot;
549
550                 while (sbi) {
551                         if (!strcmp(sbi->name, "sbi"))
552                                 break;
553
554                         sbi = sbi->parent;
555                 }
556                 if (!sbi)
557                         goto build_resources;
558
559                 regs = of_get_property(dp, "reg", NULL);
560                 if (!regs)
561                         goto build_resources;
562
563                 slot = regs->which_io;
564
565                 /* If SBI's parent is not io-unit or the io-unit lacks
566                  * a "board#" property, something is very wrong.
567                  */
568                 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
569                         printk("%s: Error, parent is not io-unit.\n",
570                                sbi->full_name);
571                         goto build_resources;
572                 }
573                 io_unit = sbi->parent;
574                 board = of_getintprop_default(io_unit, "board#", -1);
575                 if (board == -1) {
576                         printk("%s: Error, lacks board# property.\n",
577                                io_unit->full_name);
578                         goto build_resources;
579                 }
580
581                 for (i = 0; i < op->num_irqs; i++) {
582                         int this_irq = op->irqs[i];
583                         int sbusl = pil_to_sbus[this_irq];
584
585                         if (sbusl)
586                                 this_irq = (((board + 1) << 5) +
587                                             (sbusl << 2) +
588                                             slot);
589
590                         op->irqs[i] = this_irq;
591                 }
592         }
593
594 build_resources:
595         build_device_resources(op, parent);
596
597         op->dev.parent = parent;
598         op->dev.bus = &of_platform_bus_type;
599         if (!parent)
600                 strcpy(op->dev.bus_id, "root");
601         else
602                 sprintf(op->dev.bus_id, "%08x", dp->node);
603
604         if (of_device_register(op)) {
605                 printk("%s: Could not register of device.\n",
606                        dp->full_name);
607                 kfree(op);
608                 op = NULL;
609         }
610
611         return op;
612 }
613
614 static void __init scan_tree(struct device_node *dp, struct device *parent)
615 {
616         while (dp) {
617                 struct of_device *op = scan_one_device(dp, parent);
618
619                 if (op)
620                         scan_tree(dp->child, &op->dev);
621
622                 dp = dp->sibling;
623         }
624 }
625
626 static void __init scan_of_devices(void)
627 {
628         struct device_node *root = of_find_node_by_path("/");
629         struct of_device *parent;
630
631         parent = scan_one_device(root, NULL);
632         if (!parent)
633                 return;
634
635         scan_tree(root->child, &parent->dev);
636 }
637
638 static int __init of_bus_driver_init(void)
639 {
640         int err;
641
642         err = bus_register(&of_platform_bus_type);
643 #ifdef CONFIG_PCI
644         if (!err)
645                 err = bus_register(&ebus_bus_type);
646 #endif
647 #ifdef CONFIG_SBUS
648         if (!err)
649                 err = bus_register(&sbus_bus_type);
650 #endif
651
652         if (!err)
653                 scan_of_devices();
654
655         return err;
656 }
657
658 postcore_initcall(of_bus_driver_init);
659
660 static int __init of_debug(char *str)
661 {
662         int val = 0;
663
664         get_option(&str, &val);
665         if (val & 1)
666                 of_resource_verbose = 1;
667         return 1;
668 }
669
670 __setup("of_debug=", of_debug);
671
672 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
673 {
674         /* initialize common driver fields */
675         drv->driver.name = drv->name;
676         drv->driver.bus = bus;
677
678         /* register with core */
679         return driver_register(&drv->driver);
680 }
681
682 void of_unregister_driver(struct of_platform_driver *drv)
683 {
684         driver_unregister(&drv->driver);
685 }
686
687 struct of_device* of_platform_device_create(struct device_node *np,
688                                             const char *bus_id,
689                                             struct device *parent,
690                                             struct bus_type *bus)
691 {
692         struct of_device *dev;
693
694         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
695         if (!dev)
696                 return NULL;
697
698         dev->dev.parent = parent;
699         dev->dev.bus = bus;
700         dev->dev.release = of_release_dev;
701
702         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
703
704         if (of_device_register(dev) != 0) {
705                 kfree(dev);
706                 return NULL;
707         }
708
709         return dev;
710 }
711
712 EXPORT_SYMBOL(of_register_driver);
713 EXPORT_SYMBOL(of_unregister_driver);
714 EXPORT_SYMBOL(of_platform_device_create);