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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/of_device_64.c

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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/export.h>
  6 #include <linux/mod_devicetable.h>
  7 #include <linux/slab.h>
  8 #include <linux/errno.h>
  9 #include <linux/irq.h>
 10 #include <linux/of_device.h>
 11 #include <linux/of_platform.h>
 12 #include <asm/spitfire.h>
 13 
 14 #include "of_device_common.h"
 15 
 16 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
 17 {
 18         unsigned long ret = res->start + offset;
 19         struct resource *r;
 20 
 21         if (res->flags & IORESOURCE_MEM)
 22                 r = request_mem_region(ret, size, name);
 23         else
 24                 r = request_region(ret, size, name);
 25         if (!r)
 26                 ret = 0;
 27 
 28         return (void __iomem *) ret;
 29 }
 30 EXPORT_SYMBOL(of_ioremap);
 31 
 32 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
 33 {
 34         if (res->flags & IORESOURCE_MEM)
 35                 release_mem_region((unsigned long) base, size);
 36         else
 37                 release_region((unsigned long) base, size);
 38 }
 39 EXPORT_SYMBOL(of_iounmap);
 40 
 41 /*
 42  * PCI bus specific translator
 43  */
 44 
 45 static int of_bus_pci_match(struct device_node *np)
 46 {
 47         if (!strcmp(np->name, "pci")) {
 48                 const char *model = of_get_property(np, "model", NULL);
 49 
 50                 if (model && !strcmp(model, "SUNW,simba"))
 51                         return 0;
 52 
 53                 /* Do not do PCI specific frobbing if the
 54                  * PCI bridge lacks a ranges property.  We
 55                  * want to pass it through up to the next
 56                  * parent as-is, not with the PCI translate
 57                  * method which chops off the top address cell.
 58                  */
 59                 if (!of_find_property(np, "ranges", NULL))
 60                         return 0;
 61 
 62                 return 1;
 63         }
 64 
 65         return 0;
 66 }
 67 
 68 static int of_bus_simba_match(struct device_node *np)
 69 {
 70         const char *model = of_get_property(np, "model", NULL);
 71 
 72         if (model && !strcmp(model, "SUNW,simba"))
 73                 return 1;
 74 
 75         /* Treat PCI busses lacking ranges property just like
 76          * simba.
 77          */
 78         if (!strcmp(np->name, "pci")) {
 79                 if (!of_find_property(np, "ranges", NULL))
 80                         return 1;
 81         }
 82 
 83         return 0;
 84 }
 85 
 86 static int of_bus_simba_map(u32 *addr, const u32 *range,
 87                             int na, int ns, int pna)
 88 {
 89         return 0;
 90 }
 91 
 92 static void of_bus_pci_count_cells(struct device_node *np,
 93                                    int *addrc, int *sizec)
 94 {
 95         if (addrc)
 96                 *addrc = 3;
 97         if (sizec)
 98                 *sizec = 2;
 99 }
100 
101 static int of_bus_pci_map(u32 *addr, const u32 *range,
102                           int na, int ns, int pna)
103 {
104         u32 result[OF_MAX_ADDR_CELLS];
105         int i;
106 
107         /* Check address type match */
108         if (!((addr[0] ^ range[0]) & 0x03000000))
109                 goto type_match;
110 
111         /* Special exception, we can map a 64-bit address into
112          * a 32-bit range.
113          */
114         if ((addr[0] & 0x03000000) == 0x03000000 &&
115             (range[0] & 0x03000000) == 0x02000000)
116                 goto type_match;
117 
118         return -EINVAL;
119 
120 type_match:
121         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
122                             na - 1, ns))
123                 return -EINVAL;
124 
125         /* Start with the parent range base.  */
126         memcpy(result, range + na, pna * 4);
127 
128         /* Add in the child address offset, skipping high cell.  */
129         for (i = 0; i < na - 1; i++)
130                 result[pna - 1 - i] +=
131                         (addr[na - 1 - i] -
132                          range[na - 1 - i]);
133 
134         memcpy(addr, result, pna * 4);
135 
136         return 0;
137 }
138 
139 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
140 {
141         u32 w = addr[0];
142 
143         /* For PCI, we override whatever child busses may have used.  */
144         flags = 0;
145         switch((w >> 24) & 0x03) {
146         case 0x01:
147                 flags |= IORESOURCE_IO;
148                 break;
149 
150         case 0x02: /* 32 bits */
151         case 0x03: /* 64 bits */
152                 flags |= IORESOURCE_MEM;
153                 break;
154         }
155         if (w & 0x40000000)
156                 flags |= IORESOURCE_PREFETCH;
157         return flags;
158 }
159 
160 /*
161  * FHC/Central bus specific translator.
162  *
163  * This is just needed to hard-code the address and size cell
164  * counts.  'fhc' and 'central' nodes lack the #address-cells and
165  * #size-cells properties, and if you walk to the root on such
166  * Enterprise boxes all you'll get is a #size-cells of 2 which is
167  * not what we want to use.
168  */
169 static int of_bus_fhc_match(struct device_node *np)
170 {
171         return !strcmp(np->name, "fhc") ||
172                 !strcmp(np->name, "central");
173 }
174 
175 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
176 
177 /*
178  * Array of bus specific translators
179  */
180 
181 static struct of_bus of_busses[] = {
182         /* PCI */
183         {
184                 .name = "pci",
185                 .addr_prop_name = "assigned-addresses",
186                 .match = of_bus_pci_match,
187                 .count_cells = of_bus_pci_count_cells,
188                 .map = of_bus_pci_map,
189                 .get_flags = of_bus_pci_get_flags,
190         },
191         /* SIMBA */
192         {
193                 .name = "simba",
194                 .addr_prop_name = "assigned-addresses",
195                 .match = of_bus_simba_match,
196                 .count_cells = of_bus_pci_count_cells,
197                 .map = of_bus_simba_map,
198                 .get_flags = of_bus_pci_get_flags,
199         },
200         /* SBUS */
201         {
202                 .name = "sbus",
203                 .addr_prop_name = "reg",
204                 .match = of_bus_sbus_match,
205                 .count_cells = of_bus_sbus_count_cells,
206                 .map = of_bus_default_map,
207                 .get_flags = of_bus_default_get_flags,
208         },
209         /* FHC */
210         {
211                 .name = "fhc",
212                 .addr_prop_name = "reg",
213                 .match = of_bus_fhc_match,
214                 .count_cells = of_bus_fhc_count_cells,
215                 .map = of_bus_default_map,
216                 .get_flags = of_bus_default_get_flags,
217         },
218         /* Default */
219         {
220                 .name = "default",
221                 .addr_prop_name = "reg",
222                 .match = NULL,
223                 .count_cells = of_bus_default_count_cells,
224                 .map = of_bus_default_map,
225                 .get_flags = of_bus_default_get_flags,
226         },
227 };
228 
229 static struct of_bus *of_match_bus(struct device_node *np)
230 {
231         int i;
232 
233         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
234                 if (!of_busses[i].match || of_busses[i].match(np))
235                         return &of_busses[i];
236         BUG();
237         return NULL;
238 }
239 
240 static int __init build_one_resource(struct device_node *parent,
241                                      struct of_bus *bus,
242                                      struct of_bus *pbus,
243                                      u32 *addr,
244                                      int na, int ns, int pna)
245 {
246         const u32 *ranges;
247         int rone, rlen;
248 
249         ranges = of_get_property(parent, "ranges", &rlen);
250         if (ranges == NULL || rlen == 0) {
251                 u32 result[OF_MAX_ADDR_CELLS];
252                 int i;
253 
254                 memset(result, 0, pna * 4);
255                 for (i = 0; i < na; i++)
256                         result[pna - 1 - i] =
257                                 addr[na - 1 - i];
258 
259                 memcpy(addr, result, pna * 4);
260                 return 0;
261         }
262 
263         /* Now walk through the ranges */
264         rlen /= 4;
265         rone = na + pna + ns;
266         for (; rlen >= rone; rlen -= rone, ranges += rone) {
267                 if (!bus->map(addr, ranges, na, ns, pna))
268                         return 0;
269         }
270 
271         /* When we miss an I/O space match on PCI, just pass it up
272          * to the next PCI bridge and/or controller.
273          */
274         if (!strcmp(bus->name, "pci") &&
275             (addr[0] & 0x03000000) == 0x01000000)
276                 return 0;
277 
278         return 1;
279 }
280 
281 static int __init use_1to1_mapping(struct device_node *pp)
282 {
283         /* If we have a ranges property in the parent, use it.  */
284         if (of_find_property(pp, "ranges", NULL) != NULL)
285                 return 0;
286 
287         /* If the parent is the dma node of an ISA bus, pass
288          * the translation up to the root.
289          *
290          * Some SBUS devices use intermediate nodes to express
291          * hierarchy within the device itself.  These aren't
292          * real bus nodes, and don't have a 'ranges' property.
293          * But, we should still pass the translation work up
294          * to the SBUS itself.
295          */
296         if (!strcmp(pp->name, "dma") ||
297             !strcmp(pp->name, "espdma") ||
298             !strcmp(pp->name, "ledma") ||
299             !strcmp(pp->name, "lebuffer"))
300                 return 0;
301 
302         /* Similarly for all PCI bridges, if we get this far
303          * it lacks a ranges property, and this will include
304          * cases like Simba.
305          */
306         if (!strcmp(pp->name, "pci"))
307                 return 0;
308 
309         return 1;
310 }
311 
312 static int of_resource_verbose;
313 
314 static void __init build_device_resources(struct platform_device *op,
315                                           struct device *parent)
316 {
317         struct platform_device *p_op;
318         struct of_bus *bus;
319         int na, ns;
320         int index, num_reg;
321         const void *preg;
322 
323         if (!parent)
324                 return;
325 
326         p_op = to_platform_device(parent);
327         bus = of_match_bus(p_op->dev.of_node);
328         bus->count_cells(op->dev.of_node, &na, &ns);
329 
330         preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
331         if (!preg || num_reg == 0)
332                 return;
333 
334         /* Convert to num-cells.  */
335         num_reg /= 4;
336 
337         /* Convert to num-entries.  */
338         num_reg /= na + ns;
339 
340         /* Prevent overrunning the op->resources[] array.  */
341         if (num_reg > PROMREG_MAX) {
342                 printk(KERN_WARNING "%s: Too many regs (%d), "
343                        "limiting to %d.\n",
344                        op->dev.of_node->full_name, num_reg, PROMREG_MAX);
345                 num_reg = PROMREG_MAX;
346         }
347 
348         op->resource = op->archdata.resource;
349         op->num_resources = num_reg;
350         for (index = 0; index < num_reg; index++) {
351                 struct resource *r = &op->resource[index];
352                 u32 addr[OF_MAX_ADDR_CELLS];
353                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
354                 struct device_node *dp = op->dev.of_node;
355                 struct device_node *pp = p_op->dev.of_node;
356                 struct of_bus *pbus, *dbus;
357                 u64 size, result = OF_BAD_ADDR;
358                 unsigned long flags;
359                 int dna, dns;
360                 int pna, pns;
361 
362                 size = of_read_addr(reg + na, ns);
363                 memcpy(addr, reg, na * 4);
364 
365                 flags = bus->get_flags(addr, 0);
366 
367                 if (use_1to1_mapping(pp)) {
368                         result = of_read_addr(addr, na);
369                         goto build_res;
370                 }
371 
372                 dna = na;
373                 dns = ns;
374                 dbus = bus;
375 
376                 while (1) {
377                         dp = pp;
378                         pp = dp->parent;
379                         if (!pp) {
380                                 result = of_read_addr(addr, dna);
381                                 break;
382                         }
383 
384                         pbus = of_match_bus(pp);
385                         pbus->count_cells(dp, &pna, &pns);
386 
387                         if (build_one_resource(dp, dbus, pbus, addr,
388                                                dna, dns, pna))
389                                 break;
390 
391                         flags = pbus->get_flags(addr, flags);
392 
393                         dna = pna;
394                         dns = pns;
395                         dbus = pbus;
396                 }
397 
398         build_res:
399                 memset(r, 0, sizeof(*r));
400 
401                 if (of_resource_verbose)
402                         printk("%s reg[%d] -> %llx\n",
403                                op->dev.of_node->full_name, index,
404                                result);
405 
406                 if (result != OF_BAD_ADDR) {
407                         if (tlb_type == hypervisor)
408                                 result &= 0x0fffffffffffffffUL;
409 
410                         r->start = result;
411                         r->end = result + size - 1;
412                         r->flags = flags;
413                 }
414                 r->name = op->dev.of_node->name;
415         }
416 }
417 
418 static struct device_node * __init
419 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
420                     const u32 *imap, int imlen, const u32 *imask,
421                     unsigned int *irq_p)
422 {
423         struct device_node *cp;
424         unsigned int irq = *irq_p;
425         struct of_bus *bus;
426         phandle handle;
427         const u32 *reg;
428         int na, num_reg, i;
429 
430         bus = of_match_bus(pp);
431         bus->count_cells(dp, &na, NULL);
432 
433         reg = of_get_property(dp, "reg", &num_reg);
434         if (!reg || !num_reg)
435                 return NULL;
436 
437         imlen /= ((na + 3) * 4);
438         handle = 0;
439         for (i = 0; i < imlen; i++) {
440                 int j;
441 
442                 for (j = 0; j < na; j++) {
443                         if ((reg[j] & imask[j]) != imap[j])
444                                 goto next;
445                 }
446                 if (imap[na] == irq) {
447                         handle = imap[na + 1];
448                         irq = imap[na + 2];
449                         break;
450                 }
451 
452         next:
453                 imap += (na + 3);
454         }
455         if (i == imlen) {
456                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
457                  * properties that do not include the on-board device
458                  * interrupts.  Instead, the device's 'interrupts' property
459                  * is already a fully specified INO value.
460                  *
461                  * Handle this by deciding that, if we didn't get a
462                  * match in the parent's 'interrupt-map', and the
463                  * parent is an IRQ translator, then use the parent as
464                  * our IRQ controller.
465                  */
466                 if (pp->irq_trans)
467                         return pp;
468 
469                 return NULL;
470         }
471 
472         *irq_p = irq;
473         cp = of_find_node_by_phandle(handle);
474 
475         return cp;
476 }
477 
478 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
479                                            struct device_node *pp,
480                                            unsigned int irq)
481 {
482         const struct linux_prom_pci_registers *regs;
483         unsigned int bus, devfn, slot, ret;
484 
485         if (irq < 1 || irq > 4)
486                 return irq;
487 
488         regs = of_get_property(dp, "reg", NULL);
489         if (!regs)
490                 return irq;
491 
492         bus = (regs->phys_hi >> 16) & 0xff;
493         devfn = (regs->phys_hi >> 8) & 0xff;
494         slot = (devfn >> 3) & 0x1f;
495 
496         if (pp->irq_trans) {
497                 /* Derived from Table 8-3, U2P User's Manual.  This branch
498                  * is handling a PCI controller that lacks a proper set of
499                  * interrupt-map and interrupt-map-mask properties.  The
500                  * Ultra-E450 is one example.
501                  *
502                  * The bit layout is BSSLL, where:
503                  * B: 0 on bus A, 1 on bus B
504                  * D: 2-bit slot number, derived from PCI device number as
505                  *    (dev - 1) for bus A, or (dev - 2) for bus B
506                  * L: 2-bit line number
507                  */
508                 if (bus & 0x80) {
509                         /* PBM-A */
510                         bus  = 0x00;
511                         slot = (slot - 1) << 2;
512                 } else {
513                         /* PBM-B */
514                         bus  = 0x10;
515                         slot = (slot - 2) << 2;
516                 }
517                 irq -= 1;
518 
519                 ret = (bus | slot | irq);
520         } else {
521                 /* Going through a PCI-PCI bridge that lacks a set of
522                  * interrupt-map and interrupt-map-mask properties.
523                  */
524                 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
525         }
526 
527         return ret;
528 }
529 
530 static int of_irq_verbose;
531 
532 static unsigned int __init build_one_device_irq(struct platform_device *op,
533                                                 struct device *parent,
534                                                 unsigned int irq)
535 {
536         struct device_node *dp = op->dev.of_node;
537         struct device_node *pp, *ip;
538         unsigned int orig_irq = irq;
539         int nid;
540 
541         if (irq == 0xffffffff)
542                 return irq;
543 
544         if (dp->irq_trans) {
545                 irq = dp->irq_trans->irq_build(dp, irq,
546                                                dp->irq_trans->data);
547 
548                 if (of_irq_verbose)
549                         printk("%s: direct translate %x --> %x\n",
550                                dp->full_name, orig_irq, irq);
551 
552                 goto out;
553         }
554 
555         /* Something more complicated.  Walk up to the root, applying
556          * interrupt-map or bus specific translations, until we hit
557          * an IRQ translator.
558          *
559          * If we hit a bus type or situation we cannot handle, we
560          * stop and assume that the original IRQ number was in a
561          * format which has special meaning to it's immediate parent.
562          */
563         pp = dp->parent;
564         ip = NULL;
565         while (pp) {
566                 const void *imap, *imsk;
567                 int imlen;
568 
569                 imap = of_get_property(pp, "interrupt-map", &imlen);
570                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
571                 if (imap && imsk) {
572                         struct device_node *iret;
573                         int this_orig_irq = irq;
574 
575                         iret = apply_interrupt_map(dp, pp,
576                                                    imap, imlen, imsk,
577                                                    &irq);
578 
579                         if (of_irq_verbose)
580                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
581                                        op->dev.of_node->full_name,
582                                        pp->full_name, this_orig_irq,
583                                        of_node_full_name(iret), irq);
584 
585                         if (!iret)
586                                 break;
587 
588                         if (iret->irq_trans) {
589                                 ip = iret;
590                                 break;
591                         }
592                 } else {
593                         if (!strcmp(pp->name, "pci")) {
594                                 unsigned int this_orig_irq = irq;
595 
596                                 irq = pci_irq_swizzle(dp, pp, irq);
597                                 if (of_irq_verbose)
598                                         printk("%s: PCI swizzle [%s] "
599                                                "%x --> %x\n",
600                                                op->dev.of_node->full_name,
601                                                pp->full_name, this_orig_irq,
602                                                irq);
603 
604                         }
605 
606                         if (pp->irq_trans) {
607                                 ip = pp;
608                                 break;
609                         }
610                 }
611                 dp = pp;
612                 pp = pp->parent;
613         }
614         if (!ip)
615                 return orig_irq;
616 
617         irq = ip->irq_trans->irq_build(op->dev.of_node, irq,
618                                        ip->irq_trans->data);
619         if (of_irq_verbose)
620                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
621                       op->dev.of_node->full_name, ip->full_name, orig_irq, irq);
622 
623 out:
624         nid = of_node_to_nid(dp);
625         if (nid != -1) {
626                 cpumask_t numa_mask;
627 
628                 cpumask_copy(&numa_mask, cpumask_of_node(nid));
629                 irq_set_affinity(irq, &numa_mask);
630         }
631 
632         return irq;
633 }
634 
635 static struct platform_device * __init scan_one_device(struct device_node *dp,
636                                                  struct device *parent)
637 {
638         struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
639         const unsigned int *irq;
640         struct dev_archdata *sd;
641         int len, i;
642 
643         if (!op)
644                 return NULL;
645 
646         sd = &op->dev.archdata;
647         sd->op = op;
648 
649         op->dev.of_node = dp;
650 
651         irq = of_get_property(dp, "interrupts", &len);
652         if (irq) {
653                 op->archdata.num_irqs = len / 4;
654 
655                 /* Prevent overrunning the op->irqs[] array.  */
656                 if (op->archdata.num_irqs > PROMINTR_MAX) {
657                         printk(KERN_WARNING "%s: Too many irqs (%d), "
658                                "limiting to %d.\n",
659                                dp->full_name, op->archdata.num_irqs, PROMINTR_MAX);
660                         op->archdata.num_irqs = PROMINTR_MAX;
661                 }
662                 memcpy(op->archdata.irqs, irq, op->archdata.num_irqs * 4);
663         } else {
664                 op->archdata.num_irqs = 0;
665         }
666 
667         build_device_resources(op, parent);
668         for (i = 0; i < op->archdata.num_irqs; i++)
669                 op->archdata.irqs[i] = build_one_device_irq(op, parent, op->archdata.irqs[i]);
670 
671         op->dev.parent = parent;
672         op->dev.bus = &platform_bus_type;
673         if (!parent)
674                 dev_set_name(&op->dev, "root");
675         else
676                 dev_set_name(&op->dev, "%08x", dp->phandle);
677 
678         if (of_device_register(op)) {
679                 printk("%s: Could not register of device.\n",
680                        dp->full_name);
681                 kfree(op);
682                 op = NULL;
683         }
684 
685         return op;
686 }
687 
688 static void __init scan_tree(struct device_node *dp, struct device *parent)
689 {
690         while (dp) {
691                 struct platform_device *op = scan_one_device(dp, parent);
692 
693                 if (op)
694                         scan_tree(dp->child, &op->dev);
695 
696                 dp = dp->sibling;
697         }
698 }
699 
700 static int __init scan_of_devices(void)
701 {
702         struct device_node *root = of_find_node_by_path("/");
703         struct platform_device *parent;
704 
705         parent = scan_one_device(root, NULL);
706         if (!parent)
707                 return 0;
708 
709         scan_tree(root->child, &parent->dev);
710         return 0;
711 }
712 postcore_initcall(scan_of_devices);
713 
714 static int __init of_debug(char *str)
715 {
716         int val = 0;
717 
718         get_option(&str, &val);
719         if (val & 1)
720                 of_resource_verbose = 1;
721         if (val & 2)
722                 of_irq_verbose = 1;
723         return 1;
724 }
725 
726 __setup("of_debug=", of_debug);
727 

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