1 // SPDX-License-Identifier: GPL-2.0
2 #define pr_fmt(fmt) "OF: " fmt
4 #include <linux/device.h>
5 #include <linux/fwnode.h>
7 #include <linux/ioport.h>
8 #include <linux/logic_pio.h>
9 #include <linux/module.h>
10 #include <linux/of_address.h>
11 #include <linux/pci.h>
12 #include <linux/pci_regs.h>
13 #include <linux/sizes.h>
14 #include <linux/slab.h>
15 #include <linux/string.h>
16 #include <linux/dma-direct.h> /* for bus_dma_region */
18 #include "of_private.h"
20 /* Max address size we deal with */
21 #define OF_MAX_ADDR_CELLS 4
22 #define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
23 #define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0)
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, int fna);
47 int (*translate)(__be32 *addr, u64 offset, int na);
49 unsigned int (*get_flags)(const __be32 *addr);
53 * Default translator (generic bus)
56 static void of_bus_default_count_cells(struct device_node *dev,
57 int *addrc, int *sizec)
60 *addrc = of_n_addr_cells(dev);
62 *sizec = of_n_size_cells(dev);
65 static u64 of_bus_default_map(__be32 *addr, const __be32 *range,
66 int na, int ns, int pna, int fna)
70 cp = of_read_number(range + fna, na - fna);
71 s = of_read_number(range + na + pna, ns);
72 da = of_read_number(addr + fna, na - fna);
74 pr_debug("default map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
76 if (da < cp || da >= (cp + s))
81 static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
83 u64 a = of_read_number(addr, na);
84 memset(addr, 0, na * 4);
87 addr[na - 2] = cpu_to_be32(a >> 32);
88 addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
93 static unsigned int of_bus_default_flags_get_flags(const __be32 *addr)
95 return of_read_number(addr, 1);
98 static unsigned int of_bus_default_get_flags(const __be32 *addr)
100 return IORESOURCE_MEM;
103 static u64 of_bus_default_flags_map(__be32 *addr, const __be32 *range, int na,
104 int ns, int pna, int fna)
106 /* Check that flags match */
110 return of_bus_default_map(addr, range, na, ns, pna, fna);
113 static int of_bus_default_flags_translate(__be32 *addr, u64 offset, int na)
115 /* Keep "flags" part (high cell) in translated address */
116 return of_bus_default_translate(addr + 1, offset, na - 1);
120 static unsigned int of_bus_pci_get_flags(const __be32 *addr)
122 unsigned int flags = 0;
123 u32 w = be32_to_cpup(addr);
125 if (!IS_ENABLED(CONFIG_PCI))
128 switch((w >> 24) & 0x03) {
130 flags |= IORESOURCE_IO;
132 case 0x02: /* 32 bits */
133 flags |= IORESOURCE_MEM;
136 case 0x03: /* 64 bits */
137 flags |= IORESOURCE_MEM | IORESOURCE_MEM_64;
141 flags |= IORESOURCE_PREFETCH;
146 * PCI bus specific translator
149 static bool of_node_is_pcie(struct device_node *np)
151 bool is_pcie = of_node_name_eq(np, "pcie");
154 pr_warn_once("%pOF: Missing device_type\n", np);
159 static int of_bus_pci_match(struct device_node *np)
162 * "pciex" is PCI Express
163 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
164 * "ht" is hypertransport
166 * If none of the device_type match, and that the node name is
167 * "pcie", accept the device as PCI (with a warning).
169 return of_node_is_type(np, "pci") || of_node_is_type(np, "pciex") ||
170 of_node_is_type(np, "vci") || of_node_is_type(np, "ht") ||
174 static void of_bus_pci_count_cells(struct device_node *np,
175 int *addrc, int *sizec)
183 static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
188 af = of_bus_pci_get_flags(addr);
189 rf = of_bus_pci_get_flags(range);
191 /* Check address type match */
192 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
195 return of_bus_default_map(addr, range, na, ns, pna, fna);
198 #endif /* CONFIG_PCI */
201 * of_pci_range_to_resource - Create a resource from an of_pci_range
202 * @range: the PCI range that describes the resource
203 * @np: device node where the range belongs to
204 * @res: pointer to a valid resource that will be updated to
205 * reflect the values contained in the range.
207 * Returns -EINVAL if the range cannot be converted to resource.
209 * Note that if the range is an IO range, the resource will be converted
210 * using pci_address_to_pio() which can fail if it is called too early or
211 * if the range cannot be matched to any host bridge IO space (our case here).
212 * To guard against that we try to register the IO range first.
213 * If that fails we know that pci_address_to_pio() will do too.
215 int of_pci_range_to_resource(struct of_pci_range *range,
216 struct device_node *np, struct resource *res)
219 res->flags = range->flags;
220 res->parent = res->child = res->sibling = NULL;
221 res->name = np->full_name;
223 if (res->flags & IORESOURCE_IO) {
225 err = pci_register_io_range(&np->fwnode, range->cpu_addr,
229 port = pci_address_to_pio(range->cpu_addr);
230 if (port == (unsigned long)-1) {
236 if ((sizeof(resource_size_t) < 8) &&
237 upper_32_bits(range->cpu_addr)) {
242 res->start = range->cpu_addr;
244 res->end = res->start + range->size - 1;
248 res->start = (resource_size_t)OF_BAD_ADDR;
249 res->end = (resource_size_t)OF_BAD_ADDR;
252 EXPORT_SYMBOL(of_pci_range_to_resource);
255 * of_range_to_resource - Create a resource from a ranges entry
256 * @np: device node where the range belongs to
257 * @index: the 'ranges' index to convert to a resource
258 * @res: pointer to a valid resource that will be updated to
259 * reflect the values contained in the range.
261 * Returns ENOENT if the entry is not found or EINVAL if the range cannot be
262 * converted to resource.
264 int of_range_to_resource(struct device_node *np, int index, struct resource *res)
267 struct of_range_parser parser;
268 struct of_range range;
270 ret = of_range_parser_init(&parser, np);
274 for_each_of_range(&parser, &range)
276 return of_pci_range_to_resource(&range, np, res);
280 EXPORT_SYMBOL(of_range_to_resource);
283 * ISA bus specific translator
286 static int of_bus_isa_match(struct device_node *np)
288 return of_node_name_eq(np, "isa");
291 static void of_bus_isa_count_cells(struct device_node *child,
292 int *addrc, int *sizec)
300 static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns,
303 /* Check address type match */
304 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
307 return of_bus_default_map(addr, range, na, ns, pna, fna);
310 static unsigned int of_bus_isa_get_flags(const __be32 *addr)
312 unsigned int flags = 0;
313 u32 w = be32_to_cpup(addr);
316 flags |= IORESOURCE_IO;
318 flags |= IORESOURCE_MEM;
322 static int of_bus_default_flags_match(struct device_node *np)
324 return of_bus_n_addr_cells(np) == 3;
328 * Array of bus specific translators
331 static struct of_bus of_busses[] = {
336 .addresses = "assigned-addresses",
337 .match = of_bus_pci_match,
338 .count_cells = of_bus_pci_count_cells,
339 .map = of_bus_pci_map,
340 .translate = of_bus_default_flags_translate,
342 .get_flags = of_bus_pci_get_flags,
344 #endif /* CONFIG_PCI */
349 .match = of_bus_isa_match,
350 .count_cells = of_bus_isa_count_cells,
351 .map = of_bus_isa_map,
352 .translate = of_bus_default_flags_translate,
354 .get_flags = of_bus_isa_get_flags,
356 /* Default with flags cell */
358 .name = "default-flags",
360 .match = of_bus_default_flags_match,
361 .count_cells = of_bus_default_count_cells,
362 .map = of_bus_default_flags_map,
363 .translate = of_bus_default_flags_translate,
365 .get_flags = of_bus_default_flags_get_flags,
372 .count_cells = of_bus_default_count_cells,
373 .map = of_bus_default_map,
374 .translate = of_bus_default_translate,
375 .get_flags = of_bus_default_get_flags,
379 static struct of_bus *of_match_bus(struct device_node *np)
383 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
384 if (!of_busses[i].match || of_busses[i].match(np))
385 return &of_busses[i];
390 static int of_empty_ranges_quirk(struct device_node *np)
392 if (IS_ENABLED(CONFIG_PPC)) {
393 /* To save cycles, we cache the result for global "Mac" setting */
394 static int quirk_state = -1;
396 /* PA-SEMI sdc DT bug */
397 if (of_device_is_compatible(np, "1682m-sdc"))
400 /* Make quirk cached */
403 of_machine_is_compatible("Power Macintosh") ||
404 of_machine_is_compatible("MacRISC");
410 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
411 struct of_bus *pbus, __be32 *addr,
412 int na, int ns, int pna, const char *rprop)
414 const __be32 *ranges;
417 u64 offset = OF_BAD_ADDR;
420 * Normally, an absence of a "ranges" property means we are
421 * crossing a non-translatable boundary, and thus the addresses
422 * below the current cannot be converted to CPU physical ones.
423 * Unfortunately, while this is very clear in the spec, it's not
424 * what Apple understood, and they do have things like /uni-n or
425 * /ht nodes with no "ranges" property and a lot of perfectly
426 * useable mapped devices below them. Thus we treat the absence of
427 * "ranges" as equivalent to an empty "ranges" property which means
428 * a 1:1 translation at that level. It's up to the caller not to try
429 * to translate addresses that aren't supposed to be translated in
430 * the first place. --BenH.
432 * As far as we know, this damage only exists on Apple machines, so
433 * This code is only enabled on powerpc. --gcl
435 * This quirk also applies for 'dma-ranges' which frequently exist in
436 * child nodes without 'dma-ranges' in the parent nodes. --RobH
438 ranges = of_get_property(parent, rprop, &rlen);
439 if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
440 strcmp(rprop, "dma-ranges")) {
441 pr_debug("no ranges; cannot translate\n");
444 if (ranges == NULL || rlen == 0) {
445 offset = of_read_number(addr, na);
446 memset(addr, 0, pna * 4);
447 pr_debug("empty ranges; 1:1 translation\n");
451 pr_debug("walking ranges...\n");
453 /* Now walk through the ranges */
455 rone = na + pna + ns;
456 for (; rlen >= rone; rlen -= rone, ranges += rone) {
457 offset = bus->map(addr, ranges, na, ns, pna, bus->flag_cells);
458 if (offset != OF_BAD_ADDR)
461 if (offset == OF_BAD_ADDR) {
462 pr_debug("not found !\n");
465 memcpy(addr, ranges + na, 4 * pna);
468 of_dump_addr("parent translation for:", addr, pna);
469 pr_debug("with offset: %llx\n", offset);
471 /* Translate it into parent bus space */
472 return pbus->translate(addr, offset, pna);
476 * Translate an address from the device-tree into a CPU physical address,
477 * this walks up the tree and applies the various bus mappings on the
480 * Note: We consider that crossing any level with #size-cells == 0 to mean
481 * that translation is impossible (that is we are not dealing with a value
482 * that can be mapped to a cpu physical address). This is not really specified
483 * that way, but this is traditionally the way IBM at least do things
485 * Whenever the translation fails, the *host pointer will be set to the
486 * device that had registered logical PIO mapping, and the return code is
487 * relative to that node.
489 static u64 __of_translate_address(struct device_node *dev,
490 struct device_node *(*get_parent)(const struct device_node *),
491 const __be32 *in_addr, const char *rprop,
492 struct device_node **host)
494 struct device_node *parent = NULL;
495 struct of_bus *bus, *pbus;
496 __be32 addr[OF_MAX_ADDR_CELLS];
497 int na, ns, pna, pns;
498 u64 result = OF_BAD_ADDR;
500 pr_debug("** translation for device %pOF **\n", dev);
502 /* Increase refcount at current level */
506 /* Get parent & match bus type */
507 parent = get_parent(dev);
510 bus = of_match_bus(parent);
512 /* Count address cells & copy address locally */
513 bus->count_cells(dev, &na, &ns);
514 if (!OF_CHECK_COUNTS(na, ns)) {
515 pr_debug("Bad cell count for %pOF\n", dev);
518 memcpy(addr, in_addr, na * 4);
520 pr_debug("bus is %s (na=%d, ns=%d) on %pOF\n",
521 bus->name, na, ns, parent);
522 of_dump_addr("translating address:", addr, na);
526 struct logic_pio_hwaddr *iorange;
528 /* Switch to parent bus */
531 parent = get_parent(dev);
533 /* If root, we have finished */
534 if (parent == NULL) {
535 pr_debug("reached root node\n");
536 result = of_read_number(addr, na);
541 * For indirectIO device which has no ranges property, get
542 * the address from reg directly.
544 iorange = find_io_range_by_fwnode(&dev->fwnode);
545 if (iorange && (iorange->flags != LOGIC_PIO_CPU_MMIO)) {
546 result = of_read_number(addr + 1, na - 1);
547 pr_debug("indirectIO matched(%pOF) 0x%llx\n",
549 *host = of_node_get(dev);
553 /* Get new parent bus and counts */
554 pbus = of_match_bus(parent);
555 pbus->count_cells(dev, &pna, &pns);
556 if (!OF_CHECK_COUNTS(pna, pns)) {
557 pr_err("Bad cell count for %pOF\n", dev);
561 pr_debug("parent bus is %s (na=%d, ns=%d) on %pOF\n",
562 pbus->name, pna, pns, parent);
564 /* Apply bus translation */
565 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
568 /* Complete the move up one level */
573 of_dump_addr("one level translation:", addr, na);
582 u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
584 struct device_node *host;
587 ret = __of_translate_address(dev, of_get_parent,
588 in_addr, "ranges", &host);
596 EXPORT_SYMBOL(of_translate_address);
598 #ifdef CONFIG_HAS_DMA
599 struct device_node *__of_get_dma_parent(const struct device_node *np)
601 struct of_phandle_args args;
604 index = of_property_match_string(np, "interconnect-names", "dma-mem");
606 return of_get_parent(np);
608 ret = of_parse_phandle_with_args(np, "interconnects",
609 "#interconnect-cells",
612 return of_get_parent(np);
614 return of_node_get(args.np);
618 static struct device_node *of_get_next_dma_parent(struct device_node *np)
620 struct device_node *parent;
622 parent = __of_get_dma_parent(np);
628 u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
630 struct device_node *host;
633 ret = __of_translate_address(dev, __of_get_dma_parent,
634 in_addr, "dma-ranges", &host);
643 EXPORT_SYMBOL(of_translate_dma_address);
646 * of_translate_dma_region - Translate device tree address and size tuple
647 * @dev: device tree node for which to translate
648 * @prop: pointer into array of cells
649 * @start: return value for the start of the DMA range
650 * @length: return value for the length of the DMA range
652 * Returns a pointer to the cell immediately following the translated DMA region.
654 const __be32 *of_translate_dma_region(struct device_node *dev, const __be32 *prop,
655 phys_addr_t *start, size_t *length)
657 struct device_node *parent;
661 parent = __of_get_dma_parent(dev);
665 na = of_bus_n_addr_cells(parent);
666 ns = of_bus_n_size_cells(parent);
670 address = of_translate_dma_address(dev, prop);
671 if (address == OF_BAD_ADDR)
674 size = of_read_number(prop + na, ns);
682 return prop + na + ns;
684 EXPORT_SYMBOL(of_translate_dma_region);
686 const __be32 *__of_get_address(struct device_node *dev, int index, int bar_no,
687 u64 *size, unsigned int *flags)
691 struct device_node *parent;
693 int onesize, i, na, ns;
695 /* Get parent & match bus type */
696 parent = of_get_parent(dev);
699 bus = of_match_bus(parent);
700 if (strcmp(bus->name, "pci") && (bar_no >= 0)) {
704 bus->count_cells(dev, &na, &ns);
706 if (!OF_CHECK_ADDR_COUNT(na))
709 /* Get "reg" or "assigned-addresses" property */
710 prop = of_get_property(dev, bus->addresses, &psize);
716 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) {
717 u32 val = be32_to_cpu(prop[0]);
718 /* PCI bus matches on BAR number instead of index */
719 if (((bar_no >= 0) && ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0))) ||
720 ((index >= 0) && (i == index))) {
722 *size = of_read_number(prop + na, ns);
724 *flags = bus->get_flags(prop);
730 EXPORT_SYMBOL(__of_get_address);
733 * of_property_read_reg - Retrieve the specified "reg" entry index without translating
734 * @np: device tree node for which to retrieve "reg" from
735 * @idx: "reg" entry index to read
736 * @addr: return value for the untranslated address
737 * @size: return value for the entry size
739 * Returns -EINVAL if "reg" is not found. Returns 0 on success with addr and
740 * size values filled in.
742 int of_property_read_reg(struct device_node *np, int idx, u64 *addr, u64 *size)
744 const __be32 *prop = of_get_address(np, idx, size, NULL);
749 *addr = of_read_number(prop, of_n_addr_cells(np));
753 EXPORT_SYMBOL(of_property_read_reg);
755 static int parser_init(struct of_pci_range_parser *parser,
756 struct device_node *node, const char *name)
761 parser->pna = of_n_addr_cells(node);
762 parser->na = of_bus_n_addr_cells(node);
763 parser->ns = of_bus_n_size_cells(node);
764 parser->dma = !strcmp(name, "dma-ranges");
765 parser->bus = of_match_bus(node);
767 parser->range = of_get_property(node, name, &rlen);
768 if (parser->range == NULL)
771 parser->end = parser->range + rlen / sizeof(__be32);
776 int of_pci_range_parser_init(struct of_pci_range_parser *parser,
777 struct device_node *node)
779 return parser_init(parser, node, "ranges");
781 EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
783 int of_pci_dma_range_parser_init(struct of_pci_range_parser *parser,
784 struct device_node *node)
786 return parser_init(parser, node, "dma-ranges");
788 EXPORT_SYMBOL_GPL(of_pci_dma_range_parser_init);
789 #define of_dma_range_parser_init of_pci_dma_range_parser_init
791 struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
792 struct of_pci_range *range)
796 int np = parser->pna + na + ns;
797 int busflag_na = parser->bus->flag_cells;
802 if (!parser->range || parser->range + np > parser->end)
805 range->flags = parser->bus->get_flags(parser->range);
807 range->bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);
810 range->cpu_addr = of_translate_dma_address(parser->node,
813 range->cpu_addr = of_translate_address(parser->node,
815 range->size = of_read_number(parser->range + parser->pna + na, ns);
819 /* Now consume following elements while they are contiguous */
820 while (parser->range + np <= parser->end) {
822 u64 bus_addr, cpu_addr, size;
824 flags = parser->bus->get_flags(parser->range);
825 bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);
827 cpu_addr = of_translate_dma_address(parser->node,
830 cpu_addr = of_translate_address(parser->node,
832 size = of_read_number(parser->range + parser->pna + na, ns);
834 if (flags != range->flags)
836 if (bus_addr != range->bus_addr + range->size ||
837 cpu_addr != range->cpu_addr + range->size)
846 EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
848 static u64 of_translate_ioport(struct device_node *dev, const __be32 *in_addr,
853 struct device_node *host;
855 taddr = __of_translate_address(dev, of_get_parent,
856 in_addr, "ranges", &host);
858 /* host-specific port access */
859 port = logic_pio_trans_hwaddr(&host->fwnode, taddr, size);
862 /* memory-mapped I/O range */
863 port = pci_address_to_pio(taddr);
866 if (port == (unsigned long)-1)
872 #ifdef CONFIG_HAS_DMA
874 * of_dma_get_range - Get DMA range info and put it into a map array
875 * @np: device node to get DMA range info
876 * @map: dma range structure to return
878 * Look in bottom up direction for the first "dma-ranges" property
879 * and parse it. Put the information into a DMA offset map array.
882 * DMA addr (dma_addr) : naddr cells
883 * CPU addr (phys_addr_t) : pna cells
886 * It returns -ENODEV if "dma-ranges" property was not found for this
889 int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
891 struct device_node *node = of_node_get(np);
892 const __be32 *ranges = NULL;
893 bool found_dma_ranges = false;
894 struct of_range_parser parser;
895 struct of_range range;
896 struct bus_dma_region *r;
897 int len, num_ranges = 0;
901 ranges = of_get_property(node, "dma-ranges", &len);
903 /* Ignore empty ranges, they imply no translation required */
904 if (ranges && len > 0)
907 /* Once we find 'dma-ranges', then a missing one is an error */
908 if (found_dma_ranges && !ranges) {
912 found_dma_ranges = true;
914 node = of_get_next_dma_parent(node);
917 if (!node || !ranges) {
918 pr_debug("no dma-ranges found for node(%pOF)\n", np);
923 of_dma_range_parser_init(&parser, node);
924 for_each_of_range(&parser, &range) {
925 if (range.cpu_addr == OF_BAD_ADDR) {
926 pr_err("translation of DMA address(%llx) to CPU address failed node(%pOF)\n",
927 range.bus_addr, node);
938 r = kcalloc(num_ranges + 1, sizeof(*r), GFP_KERNEL);
945 * Record all info in the generic DMA ranges array for struct device,
946 * returning an error if we don't find any parsable ranges.
949 of_dma_range_parser_init(&parser, node);
950 for_each_of_range(&parser, &range) {
951 pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
952 range.bus_addr, range.cpu_addr, range.size);
953 if (range.cpu_addr == OF_BAD_ADDR)
955 r->cpu_start = range.cpu_addr;
956 r->dma_start = range.bus_addr;
957 r->size = range.size;
964 #endif /* CONFIG_HAS_DMA */
967 * of_dma_get_max_cpu_address - Gets highest CPU address suitable for DMA
968 * @np: The node to start searching from or NULL to start from the root
970 * Gets the highest CPU physical address that is addressable by all DMA masters
971 * in the sub-tree pointed by np, or the whole tree if NULL is passed. If no
972 * DMA constrained device is found, it returns PHYS_ADDR_MAX.
974 phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
976 phys_addr_t max_cpu_addr = PHYS_ADDR_MAX;
977 struct of_range_parser parser;
978 phys_addr_t subtree_max_addr;
979 struct device_node *child;
980 struct of_range range;
981 const __be32 *ranges;
988 ranges = of_get_property(np, "dma-ranges", &len);
990 of_dma_range_parser_init(&parser, np);
991 for_each_of_range(&parser, &range)
992 if (range.cpu_addr + range.size > cpu_end)
993 cpu_end = range.cpu_addr + range.size - 1;
995 if (max_cpu_addr > cpu_end)
996 max_cpu_addr = cpu_end;
999 for_each_available_child_of_node(np, child) {
1000 subtree_max_addr = of_dma_get_max_cpu_address(child);
1001 if (max_cpu_addr > subtree_max_addr)
1002 max_cpu_addr = subtree_max_addr;
1005 return max_cpu_addr;
1009 * of_dma_is_coherent - Check if device is coherent
1012 * It returns true if "dma-coherent" property was found
1013 * for this device in the DT, or if DMA is coherent by
1014 * default for OF devices on the current platform and no
1015 * "dma-noncoherent" property was found for this device.
1017 bool of_dma_is_coherent(struct device_node *np)
1019 struct device_node *node;
1020 bool is_coherent = dma_default_coherent;
1022 node = of_node_get(np);
1025 if (of_property_read_bool(node, "dma-coherent")) {
1029 if (of_property_read_bool(node, "dma-noncoherent")) {
1030 is_coherent = false;
1033 node = of_get_next_dma_parent(node);
1038 EXPORT_SYMBOL_GPL(of_dma_is_coherent);
1041 * of_mmio_is_nonposted - Check if device uses non-posted MMIO
1044 * Returns true if the "nonposted-mmio" property was found for
1047 * This is currently only enabled on builds that support Apple ARM devices, as
1050 static bool of_mmio_is_nonposted(struct device_node *np)
1052 struct device_node *parent;
1055 if (!IS_ENABLED(CONFIG_ARCH_APPLE))
1058 parent = of_get_parent(np);
1062 nonposted = of_property_read_bool(parent, "nonposted-mmio");
1064 of_node_put(parent);
1068 static int __of_address_to_resource(struct device_node *dev, int index, int bar_no,
1072 const __be32 *addrp;
1075 const char *name = NULL;
1077 addrp = __of_get_address(dev, index, bar_no, &size, &flags);
1081 /* Get optional "reg-names" property to add a name to a resource */
1083 of_property_read_string_index(dev, "reg-names", index, &name);
1085 if (flags & IORESOURCE_MEM)
1086 taddr = of_translate_address(dev, addrp);
1087 else if (flags & IORESOURCE_IO)
1088 taddr = of_translate_ioport(dev, addrp, size);
1092 if (taddr == OF_BAD_ADDR)
1094 memset(r, 0, sizeof(struct resource));
1096 if (of_mmio_is_nonposted(dev))
1097 flags |= IORESOURCE_MEM_NONPOSTED;
1100 r->end = taddr + size - 1;
1102 r->name = name ? name : dev->full_name;
1108 * of_address_to_resource - Translate device tree address and return as resource
1109 * @dev: Caller's Device Node
1110 * @index: Index into the array
1111 * @r: Pointer to resource array
1113 * Returns -EINVAL if the range cannot be converted to resource.
1115 * Note that if your address is a PIO address, the conversion will fail if
1116 * the physical address can't be internally converted to an IO token with
1117 * pci_address_to_pio(), that is because it's either called too early or it
1118 * can't be matched to any host bridge IO space
1120 int of_address_to_resource(struct device_node *dev, int index,
1123 return __of_address_to_resource(dev, index, -1, r);
1125 EXPORT_SYMBOL_GPL(of_address_to_resource);
1127 int of_pci_address_to_resource(struct device_node *dev, int bar,
1131 if (!IS_ENABLED(CONFIG_PCI))
1134 return __of_address_to_resource(dev, -1, bar, r);
1136 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
1139 * of_iomap - Maps the memory mapped IO for a given device_node
1140 * @np: the device whose io range will be mapped
1141 * @index: index of the io range
1143 * Returns a pointer to the mapped memory
1145 void __iomem *of_iomap(struct device_node *np, int index)
1147 struct resource res;
1149 if (of_address_to_resource(np, index, &res))
1152 if (res.flags & IORESOURCE_MEM_NONPOSTED)
1153 return ioremap_np(res.start, resource_size(&res));
1155 return ioremap(res.start, resource_size(&res));
1157 EXPORT_SYMBOL(of_iomap);
1160 * of_io_request_and_map - Requests a resource and maps the memory mapped IO
1161 * for a given device_node
1162 * @device: the device whose io range will be mapped
1163 * @index: index of the io range
1164 * @name: name "override" for the memory region request or NULL
1166 * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
1167 * error code on failure. Usage example:
1169 * base = of_io_request_and_map(node, 0, "foo");
1171 * return PTR_ERR(base);
1173 void __iomem *of_io_request_and_map(struct device_node *np, int index,
1176 struct resource res;
1179 if (of_address_to_resource(np, index, &res))
1180 return IOMEM_ERR_PTR(-EINVAL);
1184 if (!request_mem_region(res.start, resource_size(&res), name))
1185 return IOMEM_ERR_PTR(-EBUSY);
1187 if (res.flags & IORESOURCE_MEM_NONPOSTED)
1188 mem = ioremap_np(res.start, resource_size(&res));
1190 mem = ioremap(res.start, resource_size(&res));
1193 release_mem_region(res.start, resource_size(&res));
1194 return IOMEM_ERR_PTR(-ENOMEM);
1199 EXPORT_SYMBOL(of_io_request_and_map);