#undef DEBUG #include #include #include #include #include #include #include #include #ifdef DEBUG #define DBG(fmt...) do { printk(fmt); } while(0) #else #define DBG(fmt...) do { } while(0) #endif #ifdef CONFIG_PPC64 #define PRu64 "%lx" #else #define PRu64 "%llx" #endif /* Max address size we deal with */ #define OF_MAX_ADDR_CELLS 4 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ (ns) > 0) static struct of_bus *of_match_bus(struct device_node *np); static int __of_address_to_resource(struct device_node *dev, const u32 *addrp, u64 size, unsigned int flags, struct resource *r); /* Debug utility */ #ifdef DEBUG static void of_dump_addr(const char *s, const u32 *addr, int na) { printk("%s", s); while(na--) printk(" %08x", *(addr++)); printk("\n"); } #else static void of_dump_addr(const char *s, const u32 *addr, int na) { } #endif /* Callbacks for bus specific translators */ struct of_bus { const char *name; const char *addresses; int (*match)(struct device_node *parent); void (*count_cells)(struct device_node *child, int *addrc, int *sizec); u64 (*map)(u32 *addr, const u32 *range, int na, int ns, int pna); int (*translate)(u32 *addr, u64 offset, int na); unsigned int (*get_flags)(const u32 *addr); }; /* * Default translator (generic bus) */ static void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec) { if (addrc) *addrc = of_n_addr_cells(dev); if (sizec) *sizec = of_n_size_cells(dev); } static u64 of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna) { u64 cp, s, da; cp = of_read_number(range, na); s = of_read_number(range + na + pna, ns); da = of_read_number(addr, na); DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da); if (da < cp || da >= (cp + s)) return OF_BAD_ADDR; return da - cp; } static int of_bus_default_translate(u32 *addr, u64 offset, int na) { u64 a = of_read_number(addr, na); memset(addr, 0, na * 4); a += offset; if (na > 1) addr[na - 2] = a >> 32; addr[na - 1] = a & 0xffffffffu; return 0; } static unsigned int of_bus_default_get_flags(const u32 *addr) { return IORESOURCE_MEM; } #ifdef CONFIG_PCI /* * PCI bus specific translator */ static int of_bus_pci_match(struct device_node *np) { /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */ return !strcmp(np->type, "pci") || !strcmp(np->type, "vci"); } static void of_bus_pci_count_cells(struct device_node *np, int *addrc, int *sizec) { if (addrc) *addrc = 3; if (sizec) *sizec = 2; } static unsigned int of_bus_pci_get_flags(const u32 *addr) { unsigned int flags = 0; u32 w = addr[0]; switch((w >> 24) & 0x03) { case 0x01: flags |= IORESOURCE_IO; break; case 0x02: /* 32 bits */ case 0x03: /* 64 bits */ flags |= IORESOURCE_MEM; break; } if (w & 0x40000000) flags |= IORESOURCE_PREFETCH; return flags; } static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna) { u64 cp, s, da; unsigned int af, rf; af = of_bus_pci_get_flags(addr); rf = of_bus_pci_get_flags(range); /* Check address type match */ if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO)) return OF_BAD_ADDR; /* Read address values, skipping high cell */ cp = of_read_number(range + 1, na - 1); s = of_read_number(range + na + pna, ns); da = of_read_number(addr + 1, na - 1); DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da); if (da < cp || da >= (cp + s)) return OF_BAD_ADDR; return da - cp; } static int of_bus_pci_translate(u32 *addr, u64 offset, int na) { return of_bus_default_translate(addr + 1, offset, na - 1); } const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size, unsigned int *flags) { const u32 *prop; unsigned int psize; struct device_node *parent; struct of_bus *bus; int onesize, i, na, ns; /* Get parent & match bus type */ parent = of_get_parent(dev); if (parent == NULL) return NULL; bus = of_match_bus(parent); if (strcmp(bus->name, "pci")) { of_node_put(parent); return NULL; } bus->count_cells(dev, &na, &ns); of_node_put(parent); if (!OF_CHECK_COUNTS(na, ns)) return NULL; /* Get "reg" or "assigned-addresses" property */ prop = of_get_property(dev, bus->addresses, &psize); if (prop == NULL) return NULL; psize /= 4; onesize = na + ns; for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) { if (size) *size = of_read_number(prop + na, ns); if (flags) *flags = bus->get_flags(prop); return prop; } return NULL; } EXPORT_SYMBOL(of_get_pci_address); int of_pci_address_to_resource(struct device_node *dev, int bar, struct resource *r) { const u32 *addrp; u64 size; unsigned int flags; addrp = of_get_pci_address(dev, bar, &size, &flags); if (addrp == NULL) return -EINVAL; return __of_address_to_resource(dev, addrp, size, flags, r); } EXPORT_SYMBOL_GPL(of_pci_address_to_resource); int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq) { struct device_node *dn, *ppnode; struct pci_dev *ppdev; u32 lspec; u32 laddr[3]; u8 pin; int rc; /* Check if we have a device node, if yes, fallback to standard OF * parsing */ dn = pci_device_to_OF_node(pdev); if (dn) { rc = of_irq_map_one(dn, 0, out_irq); if (!rc) return rc; } /* Ok, we don't, time to have fun. Let's start by building up an * interrupt spec. we assume #interrupt-cells is 1, which is standard * for PCI. If you do different, then don't use that routine. */ rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); if (rc != 0) return rc; /* No pin, exit */ if (pin == 0) return -ENODEV; /* Now we walk up the PCI tree */ lspec = pin; for (;;) { /* Get the pci_dev of our parent */ ppdev = pdev->bus->self; /* Ouch, it's a host bridge... */ if (ppdev == NULL) { #ifdef CONFIG_PPC64 ppnode = pci_bus_to_OF_node(pdev->bus); #else struct pci_controller *host; host = pci_bus_to_host(pdev->bus); ppnode = host ? host->dn : NULL; #endif /* No node for host bridge ? give up */ if (ppnode == NULL) return -EINVAL; } else /* We found a P2P bridge, check if it has a node */ ppnode = pci_device_to_OF_node(ppdev); /* Ok, we have found a parent with a device-node, hand over to * the OF parsing code. * We build a unit address from the linux device to be used for * resolution. Note that we use the linux bus number which may * not match your firmware bus numbering. * Fortunately, in most cases, interrupt-map-mask doesn't include * the bus number as part of the matching. * You should still be careful about that though if you intend * to rely on this function (you ship a firmware that doesn't * create device nodes for all PCI devices). */ if (ppnode) break; /* We can only get here if we hit a P2P bridge with no node, * let's do standard swizzling and try again */ lspec = pci_swizzle_interrupt_pin(pdev, lspec); pdev = ppdev; } laddr[0] = (pdev->bus->number << 16) | (pdev->devfn << 8); laddr[1] = laddr[2] = 0; return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq); } EXPORT_SYMBOL_GPL(of_irq_map_pci); #endif /* CONFIG_PCI */ /* * ISA bus specific translator */ static int of_bus_isa_match(struct device_node *np) { return !strcmp(np->name, "isa"); } static void of_bus_isa_count_cells(struct device_node *child, int *addrc, int *sizec) { if (addrc) *addrc = 2; if (sizec) *sizec = 1; } static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna) { u64 cp, s, da; /* Check address type match */ if ((addr[0] ^ range[0]) & 0x00000001) return OF_BAD_ADDR; /* Read address values, skipping high cell */ cp = of_read_number(range + 1, na - 1); s = of_read_number(range + na + pna, ns); da = of_read_number(addr + 1, na - 1); DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da); if (da < cp || da >= (cp + s)) return OF_BAD_ADDR; return da - cp; } static int of_bus_isa_translate(u32 *addr, u64 offset, int na) { return of_bus_default_translate(addr + 1, offset, na - 1); } static unsigned int of_bus_isa_get_flags(const u32 *addr) { unsigned int flags = 0; u32 w = addr[0]; if (w & 1) flags |= IORESOURCE_IO; else flags |= IORESOURCE_MEM; return flags; } /* * Array of bus specific translators */ static struct of_bus of_busses[] = { #ifdef CONFIG_PCI /* PCI */ { .name = "pci", .addresses = "assigned-addresses", .match = of_bus_pci_match, .count_cells = of_bus_pci_count_cells, .map = of_bus_pci_map, .translate = of_bus_pci_translate, .get_flags = of_bus_pci_get_flags, }, #endif /* CONFIG_PCI */ /* ISA */ { .name = "isa", .addresses = "reg", .match = of_bus_isa_match, .count_cells = of_bus_isa_count_cells, .map = of_bus_isa_map, .translate = of_bus_isa_translate, .get_flags = of_bus_isa_get_flags, }, /* Default */ { .name = "default", .addresses = "reg", .match = NULL, .count_cells = of_bus_default_count_cells, .map = of_bus_default_map, .translate = of_bus_default_translate, .get_flags = of_bus_default_get_flags, }, }; static struct of_bus *of_match_bus(struct device_node *np) { int i; for (i = 0; i < ARRAY_SIZE(of_busses); i ++) if (!of_busses[i].match || of_busses[i].match(np)) return &of_busses[i]; BUG(); return NULL; } static int of_translate_one(struct device_node *parent, struct of_bus *bus, struct of_bus *pbus, u32 *addr, int na, int ns, int pna, const char *rprop) { const u32 *ranges; unsigned int rlen; int rone; u64 offset = OF_BAD_ADDR; /* Normally, an absence of a "ranges" property means we are * crossing a non-translatable boundary, and thus the addresses * below the current not cannot be converted to CPU physical ones. * Unfortunately, while this is very clear in the spec, it's not * what Apple understood, and they do have things like /uni-n or * /ht nodes with no "ranges" property and a lot of perfectly * useable mapped devices below them. Thus we treat the absence of * "ranges" as equivalent to an empty "ranges" property which means * a 1:1 translation at that level. It's up to the caller not to try * to translate addresses that aren't supposed to be translated in * the first place. --BenH. */ ranges = of_get_property(parent, rprop, &rlen); if (ranges == NULL || rlen == 0) { offset = of_read_number(addr, na); memset(addr, 0, pna * 4); DBG("OF: no ranges, 1:1 translation\n"); goto finish; } DBG("OF: walking ranges...\n"); /* Now walk through the ranges */ rlen /= 4; rone = na + pna + ns; for (; rlen >= rone; rlen -= rone, ranges += rone) { offset = bus->map(addr, ranges, na, ns, pna); if (offset != OF_BAD_ADDR) break; } if (offset == OF_BAD_ADDR) { DBG("OF: not found !\n"); return 1; } memcpy(addr, ranges + na, 4 * pna); finish: of_dump_addr("OF: parent translation for:", addr, pna); DBG("OF: with offset: "PRu64"\n", offset); /* Translate it into parent bus space */ return pbus->translate(addr, offset, pna); } /* * Translate an address from the device-tree into a CPU physical address, * this walks up the tree and applies the various bus mappings on the * way. * * Note: We consider that crossing any level with #size-cells == 0 to mean * that translation is impossible (that is we are not dealing with a value * that can be mapped to a cpu physical address). This is not really specified * that way, but this is traditionally the way IBM at least do things */ u64 __of_translate_address(struct device_node *dev, const u32 *in_addr, const char *rprop) { struct device_node *parent = NULL; struct of_bus *bus, *pbus; u32 addr[OF_MAX_ADDR_CELLS]; int na, ns, pna, pns; u64 result = OF_BAD_ADDR; DBG("OF: ** translation for device %s **\n", dev->full_name); /* Increase refcount at current level */ of_node_get(dev); /* Get parent & match bus type */ parent = of_get_parent(dev); if (parent == NULL) goto bail; bus = of_match_bus(parent); /* Cound address cells & copy address locally */ bus->count_cells(dev, &na, &ns); if (!OF_CHECK_COUNTS(na, ns)) { printk(KERN_ERR "prom_parse: Bad cell count for %s\n", dev->full_name); goto bail; } memcpy(addr, in_addr, na * 4); DBG("OF: bus is %s (na=%d, ns=%d) on %s\n", bus->name, na, ns, parent->full_name); of_dump_addr("OF: translating address:", addr, na); /* Translate */ for (;;) { /* Switch to parent bus */ of_node_put(dev); dev = parent; parent = of_get_parent(dev); /* If root, we have finished */ if (parent == NULL) { DBG("OF: reached root node\n"); result = of_read_number(addr, na); break; } /* Get new parent bus and counts */ pbus = of_match_bus(parent); pbus->count_cells(dev, &pna, &pns); if (!OF_CHECK_COUNTS(pna, pns)) { printk(KERN_ERR "prom_parse: Bad cell count for %s\n", dev->full_name); break; } DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n", pbus->name, pna, pns, parent->full_name); /* Apply bus translation */ if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop)) break; /* Complete the move up one level */ na = pna; ns = pns; bus = pbus; of_dump_addr("OF: one level translation:", addr, na); } bail: of_node_put(parent); of_node_put(dev); return result; } u64 of_translate_address(struct device_node *dev, const u32 *in_addr) { return __of_translate_address(dev, in_addr, "ranges"); } EXPORT_SYMBOL(of_translate_address); u64 of_translate_dma_address(struct device_node *dev, const u32 *in_addr) { return __of_translate_address(dev, in_addr, "dma-ranges"); } EXPORT_SYMBOL(of_translate_dma_address); const u32 *of_get_address(struct device_node *dev, int index, u64 *size, unsigned int *flags) { const u32 *prop; unsigned int psize; struct device_node *parent; struct of_bus *bus; int onesize, i, na, ns; /* Get parent & match bus type */ parent = of_get_parent(dev); if (parent == NULL) return NULL; bus = of_match_bus(parent); bus->count_cells(dev, &na, &ns); of_node_put(parent); if (!OF_CHECK_COUNTS(na, ns)) return NULL; /* Get "reg" or "assigned-addresses" property */ prop = of_get_property(dev, bus->addresses, &psize); if (prop == NULL) return NULL; psize /= 4; onesize = na + ns; for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) if (i == index) { if (size) *size = of_read_number(prop + na, ns); if (flags) *flags = bus->get_flags(prop); return prop; } return NULL; } EXPORT_SYMBOL(of_get_address); static int __of_address_to_resource(struct device_node *dev, const u32 *addrp, u64 size, unsigned int flags, struct resource *r) { u64 taddr; if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) return -EINVAL; taddr = of_translate_address(dev, addrp); if (taddr == OF_BAD_ADDR) return -EINVAL; memset(r, 0, sizeof(struct resource)); if (flags & IORESOURCE_IO) { unsigned long port; port = pci_address_to_pio(taddr); if (port == (unsigned long)-1) return -EINVAL; r->start = port; r->end = port + size - 1; } else { r->start = taddr; r->end = taddr + size - 1; } r->flags = flags; r->name = dev->name; return 0; } int of_address_to_resource(struct device_node *dev, int index, struct resource *r) { const u32 *addrp; u64 size; unsigned int flags; addrp = of_get_address(dev, index, &size, &flags); if (addrp == NULL) return -EINVAL; return __of_address_to_resource(dev, addrp, size, flags, r); } EXPORT_SYMBOL_GPL(of_address_to_resource); void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop, unsigned long *busno, unsigned long *phys, unsigned long *size) { const u32 *dma_window; u32 cells; const unsigned char *prop; dma_window = dma_window_prop; /* busno is always one cell */ *busno = *(dma_window++); prop = of_get_property(dn, "ibm,#dma-address-cells", NULL); if (!prop) prop = of_get_property(dn, "#address-cells", NULL); cells = prop ? *(u32 *)prop : of_n_addr_cells(dn); *phys = of_read_number(dma_window, cells); dma_window += cells; prop = of_get_property(dn, "ibm,#dma-size-cells", NULL); cells = prop ? *(u32 *)prop : of_n_size_cells(dn); *size = of_read_number(dma_window, cells); } /* * Interrupt remapper */ static struct device_node *of_irq_find_parent(struct device_node *child) { struct device_node *p; const phandle *parp; if (!of_node_get(child)) return NULL; do { parp = of_get_property(child, "interrupt-parent", NULL); if (parp == NULL) p = of_get_parent(child); else { if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) p = of_node_get(of_irq_dflt_pic); else p = of_find_node_by_phandle(*parp); } of_node_put(child); child = p; } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL); return p; } int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize, const u32 *addr, struct of_irq *out_irq) { struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; const u32 *tmp, *imap, *imask; u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; int imaplen, match, i; DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n", parent->full_name, intspec[0], intspec[1], ointsize); ipar = of_node_get(parent); /* First get the #interrupt-cells property of the current cursor * that tells us how to interpret the passed-in intspec. If there * is none, we are nice and just walk up the tree */ do { tmp = of_get_property(ipar, "#interrupt-cells", NULL); if (tmp != NULL) { intsize = *tmp; break; } tnode = ipar; ipar = of_irq_find_parent(ipar); of_node_put(tnode); } while (ipar); if (ipar == NULL) { DBG(" -> no parent found !\n"); goto fail; } DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize); if (ointsize != intsize) return -EINVAL; /* Look for this #address-cells. We have to implement the old linux * trick of looking for the parent here as some device-trees rely on it */ old = of_node_get(ipar); do { tmp = of_get_property(old, "#address-cells", NULL); tnode = of_get_parent(old); of_node_put(old); old = tnode; } while(old && tmp == NULL); of_node_put(old); old = NULL; addrsize = (tmp == NULL) ? 2 : *tmp; DBG(" -> addrsize=%d\n", addrsize); /* Now start the actual "proper" walk of the interrupt tree */ while (ipar != NULL) { /* Now check if cursor is an interrupt-controller and if it is * then we are done */ if (of_get_property(ipar, "interrupt-controller", NULL) != NULL) { DBG(" -> got it !\n"); memcpy(out_irq->specifier, intspec, intsize * sizeof(u32)); out_irq->size = intsize; out_irq->controller = ipar; of_node_put(old); return 0; } /* Now look for an interrupt-map */ imap = of_get_property(ipar, "interrupt-map", &imaplen); /* No interrupt map, check for an interrupt parent */ if (imap == NULL) { DBG(" -> no map, getting parent\n"); newpar = of_irq_find_parent(ipar); goto skiplevel; } imaplen /= sizeof(u32); /* Look for a mask */ imask = of_get_property(ipar, "interrupt-map-mask", NULL); /* If we were passed no "reg" property and we attempt to parse * an interrupt-map, then #address-cells must be 0. * Fail if it's not. */ if (addr == NULL && addrsize != 0) { DBG(" -> no reg passed in when needed !\n"); goto fail; } /* Parse interrupt-map */ match = 0; while (imaplen > (addrsize + intsize + 1) && !match) { /* Compare specifiers */ match = 1; for (i = 0; i < addrsize && match; ++i) { u32 mask = imask ? imask[i] : 0xffffffffu; match = ((addr[i] ^ imap[i]) & mask) == 0; } for (; i < (addrsize + intsize) && match; ++i) { u32 mask = imask ? imask[i] : 0xffffffffu; match = ((intspec[i-addrsize] ^ imap[i]) & mask) == 0; } imap += addrsize + intsize; imaplen -= addrsize + intsize; DBG(" -> match=%d (imaplen=%d)\n", match, imaplen); /* Get the interrupt parent */ if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) newpar = of_node_get(of_irq_dflt_pic); else newpar = of_find_node_by_phandle((phandle)*imap); imap++; --imaplen; /* Check if not found */ if (newpar == NULL) { DBG(" -> imap parent not found !\n"); goto fail; } /* Get #interrupt-cells and #address-cells of new * parent */ tmp = of_get_property(newpar, "#interrupt-cells", NULL); if (tmp == NULL) { DBG(" -> parent lacks #interrupt-cells !\n"); goto fail; } newintsize = *tmp; tmp = of_get_property(newpar, "#address-cells", NULL); newaddrsize = (tmp == NULL) ? 0 : *tmp; DBG(" -> newintsize=%d, newaddrsize=%d\n", newintsize, newaddrsize); /* Check for malformed properties */ if (imaplen < (newaddrsize + newintsize)) goto fail; imap += newaddrsize + newintsize; imaplen -= newaddrsize + newintsize; DBG(" -> imaplen=%d\n", imaplen); } if (!match) goto fail; of_node_put(old); old = of_node_get(newpar); addrsize = newaddrsize; intsize = newintsize; intspec = imap - intsize; addr = intspec - addrsize; skiplevel: /* Iterate again with new parent */ DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>"); of_node_put(ipar); ipar = newpar; newpar = NULL; } fail: of_node_put(ipar); of_node_put(old); of_node_put(newpar); return -EINVAL; } EXPORT_SYMBOL_GPL(of_irq_map_raw); int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq) { struct device_node *p; const u32 *intspec, *tmp, *addr; u32 intsize, intlen; int res = -EINVAL; DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index); /* OldWorld mac stuff is "special", handle out of line */ if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) return of_irq_map_oldworld(device, index, out_irq); /* Get the interrupts property */ intspec = of_get_property(device, "interrupts", &intlen); if (intspec == NULL) return -EINVAL; intlen /= sizeof(u32); /* Get the reg property (if any) */ addr = of_get_property(device, "reg", NULL); /* Look for the interrupt parent. */ p = of_irq_find_parent(device); if (p == NULL) return -EINVAL; /* Get size of interrupt specifier */ tmp = of_get_property(p, "#interrupt-cells", NULL); if (tmp == NULL) goto out; intsize = *tmp; DBG(" intsize=%d intlen=%d\n", intsize, intlen); /* Check index */ if ((index + 1) * intsize > intlen) goto out; /* Get new specifier and map it */ res = of_irq_map_raw(p, intspec + index * intsize, intsize, addr, out_irq); out: of_node_put(p); return res; } EXPORT_SYMBOL_GPL(of_irq_map_one); /** * Search the device tree for the best MAC address to use. 'mac-address' is * checked first, because that is supposed to contain to "most recent" MAC * address. If that isn't set, then 'local-mac-address' is checked next, * because that is the default address. If that isn't set, then the obsolete * 'address' is checked, just in case we're using an old device tree. * * Note that the 'address' property is supposed to contain a virtual address of * the register set, but some DTS files have redefined that property to be the * MAC address. * * All-zero MAC addresses are rejected, because those could be properties that * exist in the device tree, but were not set by U-Boot. For example, the * DTS could define 'mac-address' and 'local-mac-address', with zero MAC * addresses. Some older U-Boots only initialized 'local-mac-address'. In * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists * but is all zeros. */ const void *of_get_mac_address(struct device_node *np) { struct property *pp; pp = of_find_property(np, "mac-address", NULL); if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) return pp->value; pp = of_find_property(np, "local-mac-address", NULL); if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) return pp->value; pp = of_find_property(np, "address", NULL); if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) return pp->value; return NULL; } EXPORT_SYMBOL(of_get_mac_address); int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) { int irq = irq_of_parse_and_map(dev, index); /* Only dereference the resource if both the * resource and the irq are valid. */ if (r && irq != NO_IRQ) { r->start = r->end = irq; r->flags = IORESOURCE_IRQ; } return irq; } EXPORT_SYMBOL_GPL(of_irq_to_resource); void __iomem *of_iomap(struct device_node *np, int index) { struct resource res; if (of_address_to_resource(np, index, &res)) return NULL; return ioremap(res.start, 1 + res.end - res.start); } EXPORT_SYMBOL(of_iomap);