3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/pci_regs.h>
6 #include <linux/module.h>
7 #include <linux/ioport.h>
8 #include <linux/etherdevice.h>
10 #include <asm/pci-bridge.h>
13 #define DBG(fmt...) do { printk(fmt); } while(0)
15 #define DBG(fmt...) do { } while(0)
24 /* Max address size we deal with */
25 #define OF_MAX_ADDR_CELLS 4
26 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
29 static struct of_bus *of_match_bus(struct device_node *np);
30 static int __of_address_to_resource(struct device_node *dev,
31 const u32 *addrp, u64 size, unsigned int flags,
37 static void of_dump_addr(const char *s, const u32 *addr, int na)
41 printk(" %08x", *(addr++));
45 static void of_dump_addr(const char *s, const u32 *addr, int na) { }
49 /* Callbacks for bus specific translators */
52 const char *addresses;
53 int (*match)(struct device_node *parent);
54 void (*count_cells)(struct device_node *child,
55 int *addrc, int *sizec);
56 u64 (*map)(u32 *addr, const u32 *range,
57 int na, int ns, int pna);
58 int (*translate)(u32 *addr, u64 offset, int na);
59 unsigned int (*get_flags)(const u32 *addr);
64 * Default translator (generic bus)
67 static void of_bus_default_count_cells(struct device_node *dev,
68 int *addrc, int *sizec)
71 *addrc = of_n_addr_cells(dev);
73 *sizec = of_n_size_cells(dev);
76 static u64 of_bus_default_map(u32 *addr, const u32 *range,
77 int na, int ns, int pna)
81 cp = of_read_number(range, na);
82 s = of_read_number(range + na + pna, ns);
83 da = of_read_number(addr, na);
85 DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
88 if (da < cp || da >= (cp + s))
93 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
95 u64 a = of_read_number(addr, na);
96 memset(addr, 0, na * 4);
99 addr[na - 2] = a >> 32;
100 addr[na - 1] = a & 0xffffffffu;
105 static unsigned int of_bus_default_get_flags(const u32 *addr)
107 return IORESOURCE_MEM;
113 * PCI bus specific translator
116 static int of_bus_pci_match(struct device_node *np)
118 /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
119 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
122 static void of_bus_pci_count_cells(struct device_node *np,
123 int *addrc, int *sizec)
131 static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
135 /* Check address type match */
136 if ((addr[0] ^ range[0]) & 0x03000000)
139 /* Read address values, skipping high cell */
140 cp = of_read_number(range + 1, na - 1);
141 s = of_read_number(range + na + pna, ns);
142 da = of_read_number(addr + 1, na - 1);
144 DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
146 if (da < cp || da >= (cp + s))
151 static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
153 return of_bus_default_translate(addr + 1, offset, na - 1);
156 static unsigned int of_bus_pci_get_flags(const u32 *addr)
158 unsigned int flags = 0;
161 switch((w >> 24) & 0x03) {
163 flags |= IORESOURCE_IO;
165 case 0x02: /* 32 bits */
166 case 0x03: /* 64 bits */
167 flags |= IORESOURCE_MEM;
171 flags |= IORESOURCE_PREFETCH;
175 const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
180 struct device_node *parent;
182 int onesize, i, na, ns;
184 /* Get parent & match bus type */
185 parent = of_get_parent(dev);
188 bus = of_match_bus(parent);
189 if (strcmp(bus->name, "pci")) {
193 bus->count_cells(dev, &na, &ns);
195 if (!OF_CHECK_COUNTS(na, ns))
198 /* Get "reg" or "assigned-addresses" property */
199 prop = get_property(dev, bus->addresses, &psize);
205 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
206 if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
208 *size = of_read_number(prop + na, ns);
210 *flags = bus->get_flags(prop);
215 EXPORT_SYMBOL(of_get_pci_address);
217 int of_pci_address_to_resource(struct device_node *dev, int bar,
224 addrp = of_get_pci_address(dev, bar, &size, &flags);
227 return __of_address_to_resource(dev, addrp, size, flags, r);
229 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
231 static u8 of_irq_pci_swizzle(u8 slot, u8 pin)
233 return (((pin - 1) + slot) % 4) + 1;
236 int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
238 struct device_node *dn, *ppnode;
239 struct pci_dev *ppdev;
245 /* Check if we have a device node, if yes, fallback to standard OF
248 dn = pci_device_to_OF_node(pdev);
250 return of_irq_map_one(dn, 0, out_irq);
252 /* Ok, we don't, time to have fun. Let's start by building up an
253 * interrupt spec. we assume #interrupt-cells is 1, which is standard
254 * for PCI. If you do different, then don't use that routine.
256 rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
263 /* Now we walk up the PCI tree */
266 /* Get the pci_dev of our parent */
267 ppdev = pdev->bus->self;
269 /* Ouch, it's a host bridge... */
272 ppnode = pci_bus_to_OF_node(pdev->bus);
274 struct pci_controller *host;
275 host = pci_bus_to_host(pdev->bus);
276 ppnode = host ? host->arch_data : NULL;
278 /* No node for host bridge ? give up */
282 /* We found a P2P bridge, check if it has a node */
283 ppnode = pci_device_to_OF_node(ppdev);
285 /* Ok, we have found a parent with a device-node, hand over to
286 * the OF parsing code.
287 * We build a unit address from the linux device to be used for
288 * resolution. Note that we use the linux bus number which may
289 * not match your firmware bus numbering.
290 * Fortunately, in most cases, interrupt-map-mask doesn't include
291 * the bus number as part of the matching.
292 * You should still be careful about that though if you intend
293 * to rely on this function (you ship a firmware that doesn't
294 * create device nodes for all PCI devices).
299 /* We can only get here if we hit a P2P bridge with no node,
300 * let's do standard swizzling and try again
302 lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec);
306 laddr[0] = (pdev->bus->number << 16)
307 | (pdev->devfn << 8);
308 laddr[1] = laddr[2] = 0;
309 return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
311 EXPORT_SYMBOL_GPL(of_irq_map_pci);
312 #endif /* CONFIG_PCI */
315 * ISA bus specific translator
318 static int of_bus_isa_match(struct device_node *np)
320 return !strcmp(np->name, "isa");
323 static void of_bus_isa_count_cells(struct device_node *child,
324 int *addrc, int *sizec)
332 static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
336 /* Check address type match */
337 if ((addr[0] ^ range[0]) & 0x00000001)
340 /* Read address values, skipping high cell */
341 cp = of_read_number(range + 1, na - 1);
342 s = of_read_number(range + na + pna, ns);
343 da = of_read_number(addr + 1, na - 1);
345 DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
347 if (da < cp || da >= (cp + s))
352 static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
354 return of_bus_default_translate(addr + 1, offset, na - 1);
357 static unsigned int of_bus_isa_get_flags(const u32 *addr)
359 unsigned int flags = 0;
363 flags |= IORESOURCE_IO;
365 flags |= IORESOURCE_MEM;
371 * Array of bus specific translators
374 static struct of_bus of_busses[] = {
379 .addresses = "assigned-addresses",
380 .match = of_bus_pci_match,
381 .count_cells = of_bus_pci_count_cells,
382 .map = of_bus_pci_map,
383 .translate = of_bus_pci_translate,
384 .get_flags = of_bus_pci_get_flags,
386 #endif /* CONFIG_PCI */
391 .match = of_bus_isa_match,
392 .count_cells = of_bus_isa_count_cells,
393 .map = of_bus_isa_map,
394 .translate = of_bus_isa_translate,
395 .get_flags = of_bus_isa_get_flags,
402 .count_cells = of_bus_default_count_cells,
403 .map = of_bus_default_map,
404 .translate = of_bus_default_translate,
405 .get_flags = of_bus_default_get_flags,
409 static struct of_bus *of_match_bus(struct device_node *np)
413 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
414 if (!of_busses[i].match || of_busses[i].match(np))
415 return &of_busses[i];
420 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
421 struct of_bus *pbus, u32 *addr,
422 int na, int ns, int pna)
427 u64 offset = OF_BAD_ADDR;
429 /* Normally, an absence of a "ranges" property means we are
430 * crossing a non-translatable boundary, and thus the addresses
431 * below the current not cannot be converted to CPU physical ones.
432 * Unfortunately, while this is very clear in the spec, it's not
433 * what Apple understood, and they do have things like /uni-n or
434 * /ht nodes with no "ranges" property and a lot of perfectly
435 * useable mapped devices below them. Thus we treat the absence of
436 * "ranges" as equivalent to an empty "ranges" property which means
437 * a 1:1 translation at that level. It's up to the caller not to try
438 * to translate addresses that aren't supposed to be translated in
439 * the first place. --BenH.
441 ranges = get_property(parent, "ranges", &rlen);
442 if (ranges == NULL || rlen == 0) {
443 offset = of_read_number(addr, na);
444 memset(addr, 0, pna * 4);
445 DBG("OF: no ranges, 1:1 translation\n");
449 DBG("OF: walking ranges...\n");
451 /* Now walk through the ranges */
453 rone = na + pna + ns;
454 for (; rlen >= rone; rlen -= rone, ranges += rone) {
455 offset = bus->map(addr, ranges, na, ns, pna);
456 if (offset != OF_BAD_ADDR)
459 if (offset == OF_BAD_ADDR) {
460 DBG("OF: not found !\n");
463 memcpy(addr, ranges + na, 4 * pna);
466 of_dump_addr("OF: parent translation for:", addr, pna);
467 DBG("OF: with offset: "PRu64"\n", offset);
469 /* Translate it into parent bus space */
470 return pbus->translate(addr, offset, pna);
475 * Translate an address from the device-tree into a CPU physical address,
476 * this walks up the tree and applies the various bus mappings on the
479 * Note: We consider that crossing any level with #size-cells == 0 to mean
480 * that translation is impossible (that is we are not dealing with a value
481 * that can be mapped to a cpu physical address). This is not really specified
482 * that way, but this is traditionally the way IBM at least do things
484 u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
486 struct device_node *parent = NULL;
487 struct of_bus *bus, *pbus;
488 u32 addr[OF_MAX_ADDR_CELLS];
489 int na, ns, pna, pns;
490 u64 result = OF_BAD_ADDR;
492 DBG("OF: ** translation for device %s **\n", dev->full_name);
494 /* Increase refcount at current level */
497 /* Get parent & match bus type */
498 parent = of_get_parent(dev);
501 bus = of_match_bus(parent);
503 /* Cound address cells & copy address locally */
504 bus->count_cells(dev, &na, &ns);
505 if (!OF_CHECK_COUNTS(na, ns)) {
506 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
510 memcpy(addr, in_addr, na * 4);
512 DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
513 bus->name, na, ns, parent->full_name);
514 of_dump_addr("OF: translating address:", addr, na);
518 /* Switch to parent bus */
521 parent = of_get_parent(dev);
523 /* If root, we have finished */
524 if (parent == NULL) {
525 DBG("OF: reached root node\n");
526 result = of_read_number(addr, na);
530 /* Get new parent bus and counts */
531 pbus = of_match_bus(parent);
532 pbus->count_cells(dev, &pna, &pns);
533 if (!OF_CHECK_COUNTS(pna, pns)) {
534 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
539 DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
540 pbus->name, pna, pns, parent->full_name);
542 /* Apply bus translation */
543 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
546 /* Complete the move up one level */
551 of_dump_addr("OF: one level translation:", addr, na);
559 EXPORT_SYMBOL(of_translate_address);
561 const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
566 struct device_node *parent;
568 int onesize, i, na, ns;
570 /* Get parent & match bus type */
571 parent = of_get_parent(dev);
574 bus = of_match_bus(parent);
575 bus->count_cells(dev, &na, &ns);
577 if (!OF_CHECK_COUNTS(na, ns))
580 /* Get "reg" or "assigned-addresses" property */
581 prop = get_property(dev, bus->addresses, &psize);
587 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
590 *size = of_read_number(prop + na, ns);
592 *flags = bus->get_flags(prop);
597 EXPORT_SYMBOL(of_get_address);
599 static int __of_address_to_resource(struct device_node *dev, const u32 *addrp,
600 u64 size, unsigned int flags,
605 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
607 taddr = of_translate_address(dev, addrp);
608 if (taddr == OF_BAD_ADDR)
610 memset(r, 0, sizeof(struct resource));
611 if (flags & IORESOURCE_IO) {
613 port = pci_address_to_pio(taddr);
614 if (port == (unsigned long)-1)
617 r->end = port + size - 1;
620 r->end = taddr + size - 1;
627 int of_address_to_resource(struct device_node *dev, int index,
634 addrp = of_get_address(dev, index, &size, &flags);
637 return __of_address_to_resource(dev, addrp, size, flags, r);
639 EXPORT_SYMBOL_GPL(of_address_to_resource);
641 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
642 unsigned long *busno, unsigned long *phys, unsigned long *size)
644 const u32 *dma_window;
646 const unsigned char *prop;
648 dma_window = dma_window_prop;
650 /* busno is always one cell */
651 *busno = *(dma_window++);
653 prop = get_property(dn, "ibm,#dma-address-cells", NULL);
655 prop = get_property(dn, "#address-cells", NULL);
657 cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
658 *phys = of_read_number(dma_window, cells);
662 prop = get_property(dn, "ibm,#dma-size-cells", NULL);
663 cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
664 *size = of_read_number(dma_window, cells);
671 static unsigned int of_irq_workarounds;
672 static struct device_node *of_irq_dflt_pic;
674 static struct device_node *of_irq_find_parent(struct device_node *child)
676 struct device_node *p;
679 if (!of_node_get(child))
683 parp = get_property(child, "interrupt-parent", NULL);
685 p = of_get_parent(child);
687 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
688 p = of_node_get(of_irq_dflt_pic);
690 p = of_find_node_by_phandle(*parp);
694 } while (p && get_property(p, "#interrupt-cells", NULL) == NULL);
699 /* This doesn't need to be called if you don't have any special workaround
702 void of_irq_map_init(unsigned int flags)
704 of_irq_workarounds = flags;
706 /* OldWorld, don't bother looking at other things */
707 if (flags & OF_IMAP_OLDWORLD_MAC)
710 /* If we don't have phandles, let's try to locate a default interrupt
711 * controller (happens when booting with BootX). We do a first match
712 * here, hopefully, that only ever happens on machines with one
715 if (flags & OF_IMAP_NO_PHANDLE) {
716 struct device_node *np;
718 for(np = NULL; (np = of_find_all_nodes(np)) != NULL;) {
719 if (get_property(np, "interrupt-controller", NULL)
722 /* Skip /chosen/interrupt-controller */
723 if (strcmp(np->name, "chosen") == 0)
725 /* It seems like at least one person on this planet wants
726 * to use BootX on a machine with an AppleKiwi controller
727 * which happens to pretend to be an interrupt
730 if (strcmp(np->name, "AppleKiwi") == 0)
732 /* I think we found one ! */
733 of_irq_dflt_pic = np;
740 int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize,
741 const u32 *addr, struct of_irq *out_irq)
743 struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
744 const u32 *tmp, *imap, *imask;
745 u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
746 int imaplen, match, i;
748 DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
749 parent->full_name, intspec[0], intspec[1], ointsize);
751 ipar = of_node_get(parent);
753 /* First get the #interrupt-cells property of the current cursor
754 * that tells us how to interpret the passed-in intspec. If there
755 * is none, we are nice and just walk up the tree
758 tmp = get_property(ipar, "#interrupt-cells", NULL);
764 ipar = of_irq_find_parent(ipar);
768 DBG(" -> no parent found !\n");
772 DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
774 if (ointsize != intsize)
777 /* Look for this #address-cells. We have to implement the old linux
778 * trick of looking for the parent here as some device-trees rely on it
780 old = of_node_get(ipar);
782 tmp = get_property(old, "#address-cells", NULL);
783 tnode = of_get_parent(old);
786 } while(old && tmp == NULL);
789 addrsize = (tmp == NULL) ? 2 : *tmp;
791 DBG(" -> addrsize=%d\n", addrsize);
793 /* Now start the actual "proper" walk of the interrupt tree */
794 while (ipar != NULL) {
795 /* Now check if cursor is an interrupt-controller and if it is
798 if (get_property(ipar, "interrupt-controller", NULL) != NULL) {
799 DBG(" -> got it !\n");
800 memcpy(out_irq->specifier, intspec,
801 intsize * sizeof(u32));
802 out_irq->size = intsize;
803 out_irq->controller = ipar;
808 /* Now look for an interrupt-map */
809 imap = get_property(ipar, "interrupt-map", &imaplen);
810 /* No interrupt map, check for an interrupt parent */
812 DBG(" -> no map, getting parent\n");
813 newpar = of_irq_find_parent(ipar);
816 imaplen /= sizeof(u32);
818 /* Look for a mask */
819 imask = get_property(ipar, "interrupt-map-mask", NULL);
821 /* If we were passed no "reg" property and we attempt to parse
822 * an interrupt-map, then #address-cells must be 0.
825 if (addr == NULL && addrsize != 0) {
826 DBG(" -> no reg passed in when needed !\n");
830 /* Parse interrupt-map */
832 while (imaplen > (addrsize + intsize + 1) && !match) {
833 /* Compare specifiers */
835 for (i = 0; i < addrsize && match; ++i) {
836 u32 mask = imask ? imask[i] : 0xffffffffu;
837 match = ((addr[i] ^ imap[i]) & mask) == 0;
839 for (; i < (addrsize + intsize) && match; ++i) {
840 u32 mask = imask ? imask[i] : 0xffffffffu;
842 ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
844 imap += addrsize + intsize;
845 imaplen -= addrsize + intsize;
847 DBG(" -> match=%d (imaplen=%d)\n", match, imaplen);
849 /* Get the interrupt parent */
850 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
851 newpar = of_node_get(of_irq_dflt_pic);
853 newpar = of_find_node_by_phandle((phandle)*imap);
857 /* Check if not found */
858 if (newpar == NULL) {
859 DBG(" -> imap parent not found !\n");
863 /* Get #interrupt-cells and #address-cells of new
866 tmp = get_property(newpar, "#interrupt-cells",
869 DBG(" -> parent lacks #interrupt-cells !\n");
873 tmp = get_property(newpar, "#address-cells",
875 newaddrsize = (tmp == NULL) ? 0 : *tmp;
877 DBG(" -> newintsize=%d, newaddrsize=%d\n",
878 newintsize, newaddrsize);
880 /* Check for malformed properties */
881 if (imaplen < (newaddrsize + newintsize))
884 imap += newaddrsize + newintsize;
885 imaplen -= newaddrsize + newintsize;
887 DBG(" -> imaplen=%d\n", imaplen);
893 old = of_node_get(newpar);
894 addrsize = newaddrsize;
895 intsize = newintsize;
896 intspec = imap - intsize;
897 addr = intspec - addrsize;
900 /* Iterate again with new parent */
901 DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
913 EXPORT_SYMBOL_GPL(of_irq_map_raw);
915 #if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
916 static int of_irq_map_oldworld(struct device_node *device, int index,
917 struct of_irq *out_irq)
919 const u32 *ints = NULL;
923 * Old machines just have a list of interrupt numbers
924 * and no interrupt-controller nodes. We also have dodgy
925 * cases where the APPL,interrupts property is completely
926 * missing behind pci-pci bridges and we have to get it
927 * from the parent (the bridge itself, as apple just wired
928 * everything together on these)
931 ints = get_property(device, "AAPL,interrupts", &intlen);
934 device = device->parent;
935 if (device && strcmp(device->type, "pci") != 0)
940 intlen /= sizeof(u32);
945 out_irq->controller = NULL;
946 out_irq->specifier[0] = ints[index];
951 #else /* defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) */
952 static int of_irq_map_oldworld(struct device_node *device, int index,
953 struct of_irq *out_irq)
957 #endif /* !(defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)) */
959 int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
961 struct device_node *p;
962 const u32 *intspec, *tmp, *addr;
966 DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);
968 /* OldWorld mac stuff is "special", handle out of line */
969 if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
970 return of_irq_map_oldworld(device, index, out_irq);
972 /* Get the interrupts property */
973 intspec = get_property(device, "interrupts", &intlen);
976 intlen /= sizeof(u32);
978 /* Get the reg property (if any) */
979 addr = get_property(device, "reg", NULL);
981 /* Look for the interrupt parent. */
982 p = of_irq_find_parent(device);
986 /* Get size of interrupt specifier */
987 tmp = get_property(p, "#interrupt-cells", NULL);
994 DBG(" intsize=%d intlen=%d\n", intsize, intlen);
997 if ((index + 1) * intsize > intlen)
1000 /* Get new specifier and map it */
1001 res = of_irq_map_raw(p, intspec + index * intsize, intsize,
1006 EXPORT_SYMBOL_GPL(of_irq_map_one);
1009 * Search the device tree for the best MAC address to use. 'mac-address' is
1010 * checked first, because that is supposed to contain to "most recent" MAC
1011 * address. If that isn't set, then 'local-mac-address' is checked next,
1012 * because that is the default address. If that isn't set, then the obsolete
1013 * 'address' is checked, just in case we're using an old device tree.
1015 * Note that the 'address' property is supposed to contain a virtual address of
1016 * the register set, but some DTS files have redefined that property to be the
1019 * All-zero MAC addresses are rejected, because those could be properties that
1020 * exist in the device tree, but were not set by U-Boot. For example, the
1021 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
1022 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
1023 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
1026 const void *of_get_mac_address(struct device_node *np)
1028 struct property *pp;
1030 pp = of_find_property(np, "mac-address", NULL);
1031 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
1034 pp = of_find_property(np, "local-mac-address", NULL);
1035 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
1038 pp = of_find_property(np, "address", NULL);
1039 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
1044 EXPORT_SYMBOL(of_get_mac_address);