2 #define pr_fmt(fmt) "OF: " fmt
4 #include <linux/device.h>
6 #include <linux/ioport.h>
7 #include <linux/module.h>
8 #include <linux/of_address.h>
10 #include <linux/pci_regs.h>
11 #include <linux/sizes.h>
12 #include <linux/slab.h>
13 #include <linux/string.h>
15 /* Max address size we deal with */
16 #define OF_MAX_ADDR_CELLS 4
17 #define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
18 #define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0)
20 static struct of_bus *of_match_bus(struct device_node *np);
21 static int __of_address_to_resource(struct device_node *dev,
22 const __be32 *addrp, u64 size, unsigned int flags,
23 const char *name, struct resource *r);
27 static void of_dump_addr(const char *s, const __be32 *addr, int na)
31 pr_cont(" %08x", be32_to_cpu(*(addr++)));
35 static void of_dump_addr(const char *s, const __be32 *addr, int na) { }
38 /* Callbacks for bus specific translators */
41 const char *addresses;
42 int (*match)(struct device_node *parent);
43 void (*count_cells)(struct device_node *child,
44 int *addrc, int *sizec);
45 u64 (*map)(__be32 *addr, const __be32 *range,
46 int na, int ns, int pna);
47 int (*translate)(__be32 *addr, u64 offset, int na);
48 unsigned int (*get_flags)(const __be32 *addr);
52 * Default translator (generic bus)
55 static void of_bus_default_count_cells(struct device_node *dev,
56 int *addrc, int *sizec)
59 *addrc = of_n_addr_cells(dev);
61 *sizec = of_n_size_cells(dev);
64 static u64 of_bus_default_map(__be32 *addr, const __be32 *range,
65 int na, int ns, int pna)
69 cp = of_read_number(range, na);
70 s = of_read_number(range + na + pna, ns);
71 da = of_read_number(addr, na);
73 pr_debug("default map, cp=%llx, s=%llx, da=%llx\n",
74 (unsigned long long)cp, (unsigned long long)s,
75 (unsigned long long)da);
77 if (da < cp || da >= (cp + s))
82 static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
84 u64 a = of_read_number(addr, na);
85 memset(addr, 0, na * 4);
88 addr[na - 2] = cpu_to_be32(a >> 32);
89 addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
94 static unsigned int of_bus_default_get_flags(const __be32 *addr)
96 return IORESOURCE_MEM;
99 #ifdef CONFIG_OF_ADDRESS_PCI
101 * PCI bus specific translator
104 static int of_bus_pci_match(struct device_node *np)
107 * "pciex" is PCI Express
108 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
109 * "ht" is hypertransport
111 return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex") ||
112 !strcmp(np->type, "vci") || !strcmp(np->type, "ht");
115 static void of_bus_pci_count_cells(struct device_node *np,
116 int *addrc, int *sizec)
124 static unsigned int of_bus_pci_get_flags(const __be32 *addr)
126 unsigned int flags = 0;
127 u32 w = be32_to_cpup(addr);
129 switch((w >> 24) & 0x03) {
131 flags |= IORESOURCE_IO;
133 case 0x02: /* 32 bits */
134 case 0x03: /* 64 bits */
135 flags |= IORESOURCE_MEM;
139 flags |= IORESOURCE_PREFETCH;
143 static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
149 af = of_bus_pci_get_flags(addr);
150 rf = of_bus_pci_get_flags(range);
152 /* Check address type match */
153 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
156 /* Read address values, skipping high cell */
157 cp = of_read_number(range + 1, na - 1);
158 s = of_read_number(range + na + pna, ns);
159 da = of_read_number(addr + 1, na - 1);
161 pr_debug("PCI map, cp=%llx, s=%llx, da=%llx\n",
162 (unsigned long long)cp, (unsigned long long)s,
163 (unsigned long long)da);
165 if (da < cp || da >= (cp + s))
170 static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
172 return of_bus_default_translate(addr + 1, offset, na - 1);
174 #endif /* CONFIG_OF_ADDRESS_PCI */
177 const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
182 struct device_node *parent;
184 int onesize, i, na, ns;
186 /* Get parent & match bus type */
187 parent = of_get_parent(dev);
190 bus = of_match_bus(parent);
191 if (strcmp(bus->name, "pci")) {
195 bus->count_cells(dev, &na, &ns);
197 if (!OF_CHECK_ADDR_COUNT(na))
200 /* Get "reg" or "assigned-addresses" property */
201 prop = of_get_property(dev, bus->addresses, &psize);
207 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) {
208 u32 val = be32_to_cpu(prop[0]);
209 if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
211 *size = of_read_number(prop + na, ns);
213 *flags = bus->get_flags(prop);
219 EXPORT_SYMBOL(of_get_pci_address);
221 int of_pci_address_to_resource(struct device_node *dev, int bar,
228 addrp = of_get_pci_address(dev, bar, &size, &flags);
231 return __of_address_to_resource(dev, addrp, size, flags, NULL, r);
233 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
235 static int parser_init(struct of_pci_range_parser *parser,
236 struct device_node *node, const char *name)
238 const int na = 3, ns = 2;
242 parser->pna = of_n_addr_cells(node);
243 parser->np = parser->pna + na + ns;
245 parser->range = of_get_property(node, name, &rlen);
246 if (parser->range == NULL)
249 parser->end = parser->range + rlen / sizeof(__be32);
254 int of_pci_range_parser_init(struct of_pci_range_parser *parser,
255 struct device_node *node)
257 return parser_init(parser, node, "ranges");
259 EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
261 int of_pci_dma_range_parser_init(struct of_pci_range_parser *parser,
262 struct device_node *node)
264 return parser_init(parser, node, "dma-ranges");
266 EXPORT_SYMBOL_GPL(of_pci_dma_range_parser_init);
268 struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
269 struct of_pci_range *range)
271 const int na = 3, ns = 2;
276 if (!parser->range || parser->range + parser->np > parser->end)
279 range->pci_space = be32_to_cpup(parser->range);
280 range->flags = of_bus_pci_get_flags(parser->range);
281 range->pci_addr = of_read_number(parser->range + 1, ns);
282 range->cpu_addr = of_translate_address(parser->node,
284 range->size = of_read_number(parser->range + parser->pna + na, ns);
286 parser->range += parser->np;
288 /* Now consume following elements while they are contiguous */
289 while (parser->range + parser->np <= parser->end) {
291 u64 pci_addr, cpu_addr, size;
293 flags = of_bus_pci_get_flags(parser->range);
294 pci_addr = of_read_number(parser->range + 1, ns);
295 cpu_addr = of_translate_address(parser->node,
297 size = of_read_number(parser->range + parser->pna + na, ns);
299 if (flags != range->flags)
301 if (pci_addr != range->pci_addr + range->size ||
302 cpu_addr != range->cpu_addr + range->size)
306 parser->range += parser->np;
311 EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
314 * of_pci_range_to_resource - Create a resource from an of_pci_range
315 * @range: the PCI range that describes the resource
316 * @np: device node where the range belongs to
317 * @res: pointer to a valid resource that will be updated to
318 * reflect the values contained in the range.
320 * Returns EINVAL if the range cannot be converted to resource.
322 * Note that if the range is an IO range, the resource will be converted
323 * using pci_address_to_pio() which can fail if it is called too early or
324 * if the range cannot be matched to any host bridge IO space (our case here).
325 * To guard against that we try to register the IO range first.
326 * If that fails we know that pci_address_to_pio() will do too.
328 int of_pci_range_to_resource(struct of_pci_range *range,
329 struct device_node *np, struct resource *res)
332 res->flags = range->flags;
333 res->parent = res->child = res->sibling = NULL;
334 res->name = np->full_name;
336 if (res->flags & IORESOURCE_IO) {
338 err = pci_register_io_range(range->cpu_addr, range->size);
341 port = pci_address_to_pio(range->cpu_addr);
342 if (port == (unsigned long)-1) {
348 if ((sizeof(resource_size_t) < 8) &&
349 upper_32_bits(range->cpu_addr)) {
354 res->start = range->cpu_addr;
356 res->end = res->start + range->size - 1;
360 res->start = (resource_size_t)OF_BAD_ADDR;
361 res->end = (resource_size_t)OF_BAD_ADDR;
364 #endif /* CONFIG_PCI */
367 * ISA bus specific translator
370 static int of_bus_isa_match(struct device_node *np)
372 return !strcmp(np->name, "isa");
375 static void of_bus_isa_count_cells(struct device_node *child,
376 int *addrc, int *sizec)
384 static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns,
389 /* Check address type match */
390 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
393 /* Read address values, skipping high cell */
394 cp = of_read_number(range + 1, na - 1);
395 s = of_read_number(range + na + pna, ns);
396 da = of_read_number(addr + 1, na - 1);
398 pr_debug("ISA map, cp=%llx, s=%llx, da=%llx\n",
399 (unsigned long long)cp, (unsigned long long)s,
400 (unsigned long long)da);
402 if (da < cp || da >= (cp + s))
407 static int of_bus_isa_translate(__be32 *addr, u64 offset, int na)
409 return of_bus_default_translate(addr + 1, offset, na - 1);
412 static unsigned int of_bus_isa_get_flags(const __be32 *addr)
414 unsigned int flags = 0;
415 u32 w = be32_to_cpup(addr);
418 flags |= IORESOURCE_IO;
420 flags |= IORESOURCE_MEM;
425 * Array of bus specific translators
428 static struct of_bus of_busses[] = {
429 #ifdef CONFIG_OF_ADDRESS_PCI
433 .addresses = "assigned-addresses",
434 .match = of_bus_pci_match,
435 .count_cells = of_bus_pci_count_cells,
436 .map = of_bus_pci_map,
437 .translate = of_bus_pci_translate,
438 .get_flags = of_bus_pci_get_flags,
440 #endif /* CONFIG_OF_ADDRESS_PCI */
445 .match = of_bus_isa_match,
446 .count_cells = of_bus_isa_count_cells,
447 .map = of_bus_isa_map,
448 .translate = of_bus_isa_translate,
449 .get_flags = of_bus_isa_get_flags,
456 .count_cells = of_bus_default_count_cells,
457 .map = of_bus_default_map,
458 .translate = of_bus_default_translate,
459 .get_flags = of_bus_default_get_flags,
463 static struct of_bus *of_match_bus(struct device_node *np)
467 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
468 if (!of_busses[i].match || of_busses[i].match(np))
469 return &of_busses[i];
474 static int of_empty_ranges_quirk(struct device_node *np)
476 if (IS_ENABLED(CONFIG_PPC)) {
477 /* To save cycles, we cache the result for global "Mac" setting */
478 static int quirk_state = -1;
480 /* PA-SEMI sdc DT bug */
481 if (of_device_is_compatible(np, "1682m-sdc"))
484 /* Make quirk cached */
487 of_machine_is_compatible("Power Macintosh") ||
488 of_machine_is_compatible("MacRISC");
494 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
495 struct of_bus *pbus, __be32 *addr,
496 int na, int ns, int pna, const char *rprop)
498 const __be32 *ranges;
501 u64 offset = OF_BAD_ADDR;
504 * Normally, an absence of a "ranges" property means we are
505 * crossing a non-translatable boundary, and thus the addresses
506 * below the current cannot be converted to CPU physical ones.
507 * Unfortunately, while this is very clear in the spec, it's not
508 * what Apple understood, and they do have things like /uni-n or
509 * /ht nodes with no "ranges" property and a lot of perfectly
510 * useable mapped devices below them. Thus we treat the absence of
511 * "ranges" as equivalent to an empty "ranges" property which means
512 * a 1:1 translation at that level. It's up to the caller not to try
513 * to translate addresses that aren't supposed to be translated in
514 * the first place. --BenH.
516 * As far as we know, this damage only exists on Apple machines, so
517 * This code is only enabled on powerpc. --gcl
519 ranges = of_get_property(parent, rprop, &rlen);
520 if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
521 pr_debug("no ranges; cannot translate\n");
524 if (ranges == NULL || rlen == 0) {
525 offset = of_read_number(addr, na);
526 memset(addr, 0, pna * 4);
527 pr_debug("empty ranges; 1:1 translation\n");
531 pr_debug("walking ranges...\n");
533 /* Now walk through the ranges */
535 rone = na + pna + ns;
536 for (; rlen >= rone; rlen -= rone, ranges += rone) {
537 offset = bus->map(addr, ranges, na, ns, pna);
538 if (offset != OF_BAD_ADDR)
541 if (offset == OF_BAD_ADDR) {
542 pr_debug("not found !\n");
545 memcpy(addr, ranges + na, 4 * pna);
548 of_dump_addr("parent translation for:", addr, pna);
549 pr_debug("with offset: %llx\n", (unsigned long long)offset);
551 /* Translate it into parent bus space */
552 return pbus->translate(addr, offset, pna);
556 * Translate an address from the device-tree into a CPU physical address,
557 * this walks up the tree and applies the various bus mappings on the
560 * Note: We consider that crossing any level with #size-cells == 0 to mean
561 * that translation is impossible (that is we are not dealing with a value
562 * that can be mapped to a cpu physical address). This is not really specified
563 * that way, but this is traditionally the way IBM at least do things
565 static u64 __of_translate_address(struct device_node *dev,
566 const __be32 *in_addr, const char *rprop)
568 struct device_node *parent = NULL;
569 struct of_bus *bus, *pbus;
570 __be32 addr[OF_MAX_ADDR_CELLS];
571 int na, ns, pna, pns;
572 u64 result = OF_BAD_ADDR;
574 pr_debug("** translation for device %pOF **\n", dev);
576 /* Increase refcount at current level */
579 /* Get parent & match bus type */
580 parent = of_get_parent(dev);
583 bus = of_match_bus(parent);
585 /* Count address cells & copy address locally */
586 bus->count_cells(dev, &na, &ns);
587 if (!OF_CHECK_COUNTS(na, ns)) {
588 pr_debug("Bad cell count for %pOF\n", dev);
591 memcpy(addr, in_addr, na * 4);
593 pr_debug("bus is %s (na=%d, ns=%d) on %pOF\n",
594 bus->name, na, ns, parent);
595 of_dump_addr("translating address:", addr, na);
599 /* Switch to parent bus */
602 parent = of_get_parent(dev);
604 /* If root, we have finished */
605 if (parent == NULL) {
606 pr_debug("reached root node\n");
607 result = of_read_number(addr, na);
611 /* Get new parent bus and counts */
612 pbus = of_match_bus(parent);
613 pbus->count_cells(dev, &pna, &pns);
614 if (!OF_CHECK_COUNTS(pna, pns)) {
615 pr_err("Bad cell count for %pOF\n", dev);
619 pr_debug("parent bus is %s (na=%d, ns=%d) on %pOF\n",
620 pbus->name, pna, pns, parent);
622 /* Apply bus translation */
623 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
626 /* Complete the move up one level */
631 of_dump_addr("one level translation:", addr, na);
640 u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
642 return __of_translate_address(dev, in_addr, "ranges");
644 EXPORT_SYMBOL(of_translate_address);
646 u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
648 return __of_translate_address(dev, in_addr, "dma-ranges");
650 EXPORT_SYMBOL(of_translate_dma_address);
652 const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
657 struct device_node *parent;
659 int onesize, i, na, ns;
661 /* Get parent & match bus type */
662 parent = of_get_parent(dev);
665 bus = of_match_bus(parent);
666 bus->count_cells(dev, &na, &ns);
668 if (!OF_CHECK_ADDR_COUNT(na))
671 /* Get "reg" or "assigned-addresses" property */
672 prop = of_get_property(dev, bus->addresses, &psize);
678 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
681 *size = of_read_number(prop + na, ns);
683 *flags = bus->get_flags(prop);
688 EXPORT_SYMBOL(of_get_address);
690 static int __of_address_to_resource(struct device_node *dev,
691 const __be32 *addrp, u64 size, unsigned int flags,
692 const char *name, struct resource *r)
696 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
698 taddr = of_translate_address(dev, addrp);
699 if (taddr == OF_BAD_ADDR)
701 memset(r, 0, sizeof(struct resource));
702 if (flags & IORESOURCE_IO) {
704 port = pci_address_to_pio(taddr);
705 if (port == (unsigned long)-1)
708 r->end = port + size - 1;
711 r->end = taddr + size - 1;
714 r->name = name ? name : dev->full_name;
720 * of_address_to_resource - Translate device tree address and return as resource
722 * Note that if your address is a PIO address, the conversion will fail if
723 * the physical address can't be internally converted to an IO token with
724 * pci_address_to_pio(), that is because it's either called too early or it
725 * can't be matched to any host bridge IO space
727 int of_address_to_resource(struct device_node *dev, int index,
733 const char *name = NULL;
735 addrp = of_get_address(dev, index, &size, &flags);
739 /* Get optional "reg-names" property to add a name to a resource */
740 of_property_read_string_index(dev, "reg-names", index, &name);
742 return __of_address_to_resource(dev, addrp, size, flags, name, r);
744 EXPORT_SYMBOL_GPL(of_address_to_resource);
746 struct device_node *of_find_matching_node_by_address(struct device_node *from,
747 const struct of_device_id *matches,
750 struct device_node *dn = of_find_matching_node(from, matches);
754 if (!of_address_to_resource(dn, 0, &res) &&
755 res.start == base_address)
758 dn = of_find_matching_node(dn, matches);
766 * of_iomap - Maps the memory mapped IO for a given device_node
767 * @device: the device whose io range will be mapped
768 * @index: index of the io range
770 * Returns a pointer to the mapped memory
772 void __iomem *of_iomap(struct device_node *np, int index)
776 if (of_address_to_resource(np, index, &res))
779 return ioremap(res.start, resource_size(&res));
781 EXPORT_SYMBOL(of_iomap);
784 * of_io_request_and_map - Requests a resource and maps the memory mapped IO
785 * for a given device_node
786 * @device: the device whose io range will be mapped
787 * @index: index of the io range
788 * @name: name of the resource
790 * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
791 * error code on failure. Usage example:
793 * base = of_io_request_and_map(node, 0, "foo");
795 * return PTR_ERR(base);
797 void __iomem *of_io_request_and_map(struct device_node *np, int index,
803 if (of_address_to_resource(np, index, &res))
804 return IOMEM_ERR_PTR(-EINVAL);
806 if (!request_mem_region(res.start, resource_size(&res), name))
807 return IOMEM_ERR_PTR(-EBUSY);
809 mem = ioremap(res.start, resource_size(&res));
811 release_mem_region(res.start, resource_size(&res));
812 return IOMEM_ERR_PTR(-ENOMEM);
817 EXPORT_SYMBOL(of_io_request_and_map);
820 * of_dma_get_range - Get DMA range info
821 * @np: device node to get DMA range info
822 * @dma_addr: pointer to store initial DMA address of DMA range
823 * @paddr: pointer to store initial CPU address of DMA range
824 * @size: pointer to store size of DMA range
826 * Look in bottom up direction for the first "dma-ranges" property
829 * DMA addr (dma_addr) : naddr cells
830 * CPU addr (phys_addr_t) : pna cells
833 * It returns -ENODEV if "dma-ranges" property was not found
834 * for this device in DT.
836 int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size)
838 struct device_node *node = of_node_get(np);
839 const __be32 *ranges = NULL;
840 int len, naddr, nsize, pna;
848 naddr = of_n_addr_cells(node);
849 nsize = of_n_size_cells(node);
850 node = of_get_next_parent(node);
854 ranges = of_get_property(node, "dma-ranges", &len);
856 /* Ignore empty ranges, they imply no translation required */
857 if (ranges && len > 0)
861 * At least empty ranges has to be defined for parent node if
869 pr_debug("no dma-ranges found for node(%pOF)\n", np);
876 pna = of_n_addr_cells(node);
878 /* dma-ranges format:
879 * DMA addr : naddr cells
880 * CPU addr : pna cells
883 dmaaddr = of_read_number(ranges, naddr);
884 *paddr = of_translate_dma_address(np, ranges);
885 if (*paddr == OF_BAD_ADDR) {
886 pr_err("translation of DMA address(%pad) to CPU address failed node(%pOF)\n",
893 *size = of_read_number(ranges + naddr + pna, nsize);
895 pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
896 *dma_addr, *paddr, *size);
903 EXPORT_SYMBOL_GPL(of_dma_get_range);
906 * of_dma_is_coherent - Check if device is coherent
909 * It returns true if "dma-coherent" property was found
910 * for this device in DT.
912 bool of_dma_is_coherent(struct device_node *np)
914 struct device_node *node = of_node_get(np);
917 if (of_property_read_bool(node, "dma-coherent")) {
921 node = of_get_next_parent(node);
926 EXPORT_SYMBOL_GPL(of_dma_is_coherent);