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)
25 static struct of_bus *of_match_bus(struct device_node *np);
26 static int __of_address_to_resource(struct device_node *dev, int index,
27 int bar_no, struct resource *r);
28 static bool of_mmio_is_nonposted(struct device_node *np);
32 static void of_dump_addr(const char *s, const __be32 *addr, int na)
36 pr_cont(" %08x", be32_to_cpu(*(addr++)));
40 static void of_dump_addr(const char *s, const __be32 *addr, int na) { }
43 /* Callbacks for bus specific translators */
46 const char *addresses;
47 int (*match)(struct device_node *parent);
48 void (*count_cells)(struct device_node *child,
49 int *addrc, int *sizec);
50 u64 (*map)(__be32 *addr, const __be32 *range,
51 int na, int ns, int pna);
52 int (*translate)(__be32 *addr, u64 offset, int na);
54 unsigned int (*get_flags)(const __be32 *addr);
58 * Default translator (generic bus)
61 static void of_bus_default_count_cells(struct device_node *dev,
62 int *addrc, int *sizec)
65 *addrc = of_n_addr_cells(dev);
67 *sizec = of_n_size_cells(dev);
70 static u64 of_bus_default_map(__be32 *addr, const __be32 *range,
71 int na, int ns, int pna)
75 cp = of_read_number(range, na);
76 s = of_read_number(range + na + pna, ns);
77 da = of_read_number(addr, na);
79 pr_debug("default map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
81 if (da < cp || da >= (cp + s))
86 static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
88 u64 a = of_read_number(addr, na);
89 memset(addr, 0, na * 4);
92 addr[na - 2] = cpu_to_be32(a >> 32);
93 addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
98 static unsigned int of_bus_default_get_flags(const __be32 *addr)
100 return IORESOURCE_MEM;
104 static unsigned int of_bus_pci_get_flags(const __be32 *addr)
106 unsigned int flags = 0;
107 u32 w = be32_to_cpup(addr);
109 if (!IS_ENABLED(CONFIG_PCI))
112 switch((w >> 24) & 0x03) {
114 flags |= IORESOURCE_IO;
116 case 0x02: /* 32 bits */
117 flags |= IORESOURCE_MEM;
120 case 0x03: /* 64 bits */
121 flags |= IORESOURCE_MEM | IORESOURCE_MEM_64;
125 flags |= IORESOURCE_PREFETCH;
130 * PCI bus specific translator
133 static bool of_node_is_pcie(struct device_node *np)
135 bool is_pcie = of_node_name_eq(np, "pcie");
138 pr_warn_once("%pOF: Missing device_type\n", np);
143 static int of_bus_pci_match(struct device_node *np)
146 * "pciex" is PCI Express
147 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
148 * "ht" is hypertransport
150 * If none of the device_type match, and that the node name is
151 * "pcie", accept the device as PCI (with a warning).
153 return of_node_is_type(np, "pci") || of_node_is_type(np, "pciex") ||
154 of_node_is_type(np, "vci") || of_node_is_type(np, "ht") ||
158 static void of_bus_pci_count_cells(struct device_node *np,
159 int *addrc, int *sizec)
167 static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
173 af = of_bus_pci_get_flags(addr);
174 rf = of_bus_pci_get_flags(range);
176 /* Check address type match */
177 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
180 /* Read address values, skipping high cell */
181 cp = of_read_number(range + 1, na - 1);
182 s = of_read_number(range + na + pna, ns);
183 da = of_read_number(addr + 1, na - 1);
185 pr_debug("PCI map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
187 if (da < cp || da >= (cp + s))
192 static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
194 return of_bus_default_translate(addr + 1, offset, na - 1);
196 #endif /* CONFIG_PCI */
198 int of_pci_address_to_resource(struct device_node *dev, int bar,
202 if (!IS_ENABLED(CONFIG_PCI))
205 return __of_address_to_resource(dev, -1, bar, r);
207 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
210 * of_pci_range_to_resource - Create a resource from an of_pci_range
211 * @range: the PCI range that describes the resource
212 * @np: device node where the range belongs to
213 * @res: pointer to a valid resource that will be updated to
214 * reflect the values contained in the range.
216 * Returns EINVAL if the range cannot be converted to resource.
218 * Note that if the range is an IO range, the resource will be converted
219 * using pci_address_to_pio() which can fail if it is called too early or
220 * if the range cannot be matched to any host bridge IO space (our case here).
221 * To guard against that we try to register the IO range first.
222 * If that fails we know that pci_address_to_pio() will do too.
224 int of_pci_range_to_resource(struct of_pci_range *range,
225 struct device_node *np, struct resource *res)
228 res->flags = range->flags;
229 res->parent = res->child = res->sibling = NULL;
230 res->name = np->full_name;
232 if (!IS_ENABLED(CONFIG_PCI))
235 if (res->flags & IORESOURCE_IO) {
237 err = pci_register_io_range(&np->fwnode, range->cpu_addr,
241 port = pci_address_to_pio(range->cpu_addr);
242 if (port == (unsigned long)-1) {
248 if ((sizeof(resource_size_t) < 8) &&
249 upper_32_bits(range->cpu_addr)) {
254 res->start = range->cpu_addr;
256 res->end = res->start + range->size - 1;
260 res->start = (resource_size_t)OF_BAD_ADDR;
261 res->end = (resource_size_t)OF_BAD_ADDR;
264 EXPORT_SYMBOL(of_pci_range_to_resource);
267 * ISA bus specific translator
270 static int of_bus_isa_match(struct device_node *np)
272 return of_node_name_eq(np, "isa");
275 static void of_bus_isa_count_cells(struct device_node *child,
276 int *addrc, int *sizec)
284 static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns,
289 /* Check address type match */
290 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
293 /* Read address values, skipping high cell */
294 cp = of_read_number(range + 1, na - 1);
295 s = of_read_number(range + na + pna, ns);
296 da = of_read_number(addr + 1, na - 1);
298 pr_debug("ISA map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
300 if (da < cp || da >= (cp + s))
305 static int of_bus_isa_translate(__be32 *addr, u64 offset, int na)
307 return of_bus_default_translate(addr + 1, offset, na - 1);
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;
323 * Array of bus specific translators
326 static struct of_bus of_busses[] = {
331 .addresses = "assigned-addresses",
332 .match = of_bus_pci_match,
333 .count_cells = of_bus_pci_count_cells,
334 .map = of_bus_pci_map,
335 .translate = of_bus_pci_translate,
337 .get_flags = of_bus_pci_get_flags,
339 #endif /* CONFIG_PCI */
344 .match = of_bus_isa_match,
345 .count_cells = of_bus_isa_count_cells,
346 .map = of_bus_isa_map,
347 .translate = of_bus_isa_translate,
349 .get_flags = of_bus_isa_get_flags,
356 .count_cells = of_bus_default_count_cells,
357 .map = of_bus_default_map,
358 .translate = of_bus_default_translate,
359 .get_flags = of_bus_default_get_flags,
363 static struct of_bus *of_match_bus(struct device_node *np)
367 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
368 if (!of_busses[i].match || of_busses[i].match(np))
369 return &of_busses[i];
374 static int of_empty_ranges_quirk(struct device_node *np)
376 if (IS_ENABLED(CONFIG_PPC)) {
377 /* To save cycles, we cache the result for global "Mac" setting */
378 static int quirk_state = -1;
380 /* PA-SEMI sdc DT bug */
381 if (of_device_is_compatible(np, "1682m-sdc"))
384 /* Make quirk cached */
387 of_machine_is_compatible("Power Macintosh") ||
388 of_machine_is_compatible("MacRISC");
394 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
395 struct of_bus *pbus, __be32 *addr,
396 int na, int ns, int pna, const char *rprop)
398 const __be32 *ranges;
401 u64 offset = OF_BAD_ADDR;
404 * Normally, an absence of a "ranges" property means we are
405 * crossing a non-translatable boundary, and thus the addresses
406 * below the current cannot be converted to CPU physical ones.
407 * Unfortunately, while this is very clear in the spec, it's not
408 * what Apple understood, and they do have things like /uni-n or
409 * /ht nodes with no "ranges" property and a lot of perfectly
410 * useable mapped devices below them. Thus we treat the absence of
411 * "ranges" as equivalent to an empty "ranges" property which means
412 * a 1:1 translation at that level. It's up to the caller not to try
413 * to translate addresses that aren't supposed to be translated in
414 * the first place. --BenH.
416 * As far as we know, this damage only exists on Apple machines, so
417 * This code is only enabled on powerpc. --gcl
419 * This quirk also applies for 'dma-ranges' which frequently exist in
420 * child nodes without 'dma-ranges' in the parent nodes. --RobH
422 ranges = of_get_property(parent, rprop, &rlen);
423 if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
424 strcmp(rprop, "dma-ranges")) {
425 pr_debug("no ranges; cannot translate\n");
428 if (ranges == NULL || rlen == 0) {
429 offset = of_read_number(addr, na);
430 memset(addr, 0, pna * 4);
431 pr_debug("empty ranges; 1:1 translation\n");
435 pr_debug("walking ranges...\n");
437 /* Now walk through the ranges */
439 rone = na + pna + ns;
440 for (; rlen >= rone; rlen -= rone, ranges += rone) {
441 offset = bus->map(addr, ranges, na, ns, pna);
442 if (offset != OF_BAD_ADDR)
445 if (offset == OF_BAD_ADDR) {
446 pr_debug("not found !\n");
449 memcpy(addr, ranges + na, 4 * pna);
452 of_dump_addr("parent translation for:", addr, pna);
453 pr_debug("with offset: %llx\n", offset);
455 /* Translate it into parent bus space */
456 return pbus->translate(addr, offset, pna);
460 * Translate an address from the device-tree into a CPU physical address,
461 * this walks up the tree and applies the various bus mappings on the
464 * Note: We consider that crossing any level with #size-cells == 0 to mean
465 * that translation is impossible (that is we are not dealing with a value
466 * that can be mapped to a cpu physical address). This is not really specified
467 * that way, but this is traditionally the way IBM at least do things
469 * Whenever the translation fails, the *host pointer will be set to the
470 * device that had registered logical PIO mapping, and the return code is
471 * relative to that node.
473 static u64 __of_translate_address(struct device_node *dev,
474 struct device_node *(*get_parent)(const struct device_node *),
475 const __be32 *in_addr, const char *rprop,
476 struct device_node **host)
478 struct device_node *parent = NULL;
479 struct of_bus *bus, *pbus;
480 __be32 addr[OF_MAX_ADDR_CELLS];
481 int na, ns, pna, pns;
482 u64 result = OF_BAD_ADDR;
484 pr_debug("** translation for device %pOF **\n", dev);
486 /* Increase refcount at current level */
490 /* Get parent & match bus type */
491 parent = get_parent(dev);
494 bus = of_match_bus(parent);
496 /* Count address cells & copy address locally */
497 bus->count_cells(dev, &na, &ns);
498 if (!OF_CHECK_COUNTS(na, ns)) {
499 pr_debug("Bad cell count for %pOF\n", dev);
502 memcpy(addr, in_addr, na * 4);
504 pr_debug("bus is %s (na=%d, ns=%d) on %pOF\n",
505 bus->name, na, ns, parent);
506 of_dump_addr("translating address:", addr, na);
510 struct logic_pio_hwaddr *iorange;
512 /* Switch to parent bus */
515 parent = get_parent(dev);
517 /* If root, we have finished */
518 if (parent == NULL) {
519 pr_debug("reached root node\n");
520 result = of_read_number(addr, na);
525 * For indirectIO device which has no ranges property, get
526 * the address from reg directly.
528 iorange = find_io_range_by_fwnode(&dev->fwnode);
529 if (iorange && (iorange->flags != LOGIC_PIO_CPU_MMIO)) {
530 result = of_read_number(addr + 1, na - 1);
531 pr_debug("indirectIO matched(%pOF) 0x%llx\n",
533 *host = of_node_get(dev);
537 /* Get new parent bus and counts */
538 pbus = of_match_bus(parent);
539 pbus->count_cells(dev, &pna, &pns);
540 if (!OF_CHECK_COUNTS(pna, pns)) {
541 pr_err("Bad cell count for %pOF\n", dev);
545 pr_debug("parent bus is %s (na=%d, ns=%d) on %pOF\n",
546 pbus->name, pna, pns, parent);
548 /* Apply bus translation */
549 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
552 /* Complete the move up one level */
557 of_dump_addr("one level translation:", addr, na);
566 u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
568 struct device_node *host;
571 ret = __of_translate_address(dev, of_get_parent,
572 in_addr, "ranges", &host);
580 EXPORT_SYMBOL(of_translate_address);
582 static struct device_node *__of_get_dma_parent(const struct device_node *np)
584 struct of_phandle_args args;
587 index = of_property_match_string(np, "interconnect-names", "dma-mem");
589 return of_get_parent(np);
591 ret = of_parse_phandle_with_args(np, "interconnects",
592 "#interconnect-cells",
595 return of_get_parent(np);
597 return of_node_get(args.np);
600 static struct device_node *of_get_next_dma_parent(struct device_node *np)
602 struct device_node *parent;
604 parent = __of_get_dma_parent(np);
610 u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
612 struct device_node *host;
615 ret = __of_translate_address(dev, __of_get_dma_parent,
616 in_addr, "dma-ranges", &host);
625 EXPORT_SYMBOL(of_translate_dma_address);
627 const __be32 *__of_get_address(struct device_node *dev, int index, int bar_no,
628 u64 *size, unsigned int *flags)
632 struct device_node *parent;
634 int onesize, i, na, ns;
636 /* Get parent & match bus type */
637 parent = of_get_parent(dev);
640 bus = of_match_bus(parent);
641 if (strcmp(bus->name, "pci") && (bar_no >= 0)) {
645 bus->count_cells(dev, &na, &ns);
647 if (!OF_CHECK_ADDR_COUNT(na))
650 /* Get "reg" or "assigned-addresses" property */
651 prop = of_get_property(dev, bus->addresses, &psize);
657 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) {
658 u32 val = be32_to_cpu(prop[0]);
659 /* PCI bus matches on BAR number instead of index */
660 if (((bar_no >= 0) && ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0))) ||
661 ((index >= 0) && (i == index))) {
663 *size = of_read_number(prop + na, ns);
665 *flags = bus->get_flags(prop);
671 EXPORT_SYMBOL(__of_get_address);
673 static int parser_init(struct of_pci_range_parser *parser,
674 struct device_node *node, const char *name)
679 parser->pna = of_n_addr_cells(node);
680 parser->na = of_bus_n_addr_cells(node);
681 parser->ns = of_bus_n_size_cells(node);
682 parser->dma = !strcmp(name, "dma-ranges");
683 parser->bus = of_match_bus(node);
685 parser->range = of_get_property(node, name, &rlen);
686 if (parser->range == NULL)
689 parser->end = parser->range + rlen / sizeof(__be32);
694 int of_pci_range_parser_init(struct of_pci_range_parser *parser,
695 struct device_node *node)
697 return parser_init(parser, node, "ranges");
699 EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
701 int of_pci_dma_range_parser_init(struct of_pci_range_parser *parser,
702 struct device_node *node)
704 return parser_init(parser, node, "dma-ranges");
706 EXPORT_SYMBOL_GPL(of_pci_dma_range_parser_init);
707 #define of_dma_range_parser_init of_pci_dma_range_parser_init
709 struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
710 struct of_pci_range *range)
714 int np = parser->pna + na + ns;
720 if (!parser->range || parser->range + np > parser->end)
723 range->flags = parser->bus->get_flags(parser->range);
725 /* A extra cell for resource flags */
726 if (parser->bus->has_flags)
729 range->bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);
732 range->cpu_addr = of_translate_dma_address(parser->node,
735 range->cpu_addr = of_translate_address(parser->node,
737 range->size = of_read_number(parser->range + parser->pna + na, ns);
741 /* Now consume following elements while they are contiguous */
742 while (parser->range + np <= parser->end) {
744 u64 bus_addr, cpu_addr, size;
746 flags = parser->bus->get_flags(parser->range);
747 bus_addr = of_read_number(parser->range + busflag_na, na - busflag_na);
749 cpu_addr = of_translate_dma_address(parser->node,
752 cpu_addr = of_translate_address(parser->node,
754 size = of_read_number(parser->range + parser->pna + na, ns);
756 if (flags != range->flags)
758 if (bus_addr != range->bus_addr + range->size ||
759 cpu_addr != range->cpu_addr + range->size)
768 EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
770 static u64 of_translate_ioport(struct device_node *dev, const __be32 *in_addr,
775 struct device_node *host;
777 taddr = __of_translate_address(dev, of_get_parent,
778 in_addr, "ranges", &host);
780 /* host-specific port access */
781 port = logic_pio_trans_hwaddr(&host->fwnode, taddr, size);
784 /* memory-mapped I/O range */
785 port = pci_address_to_pio(taddr);
788 if (port == (unsigned long)-1)
794 static int __of_address_to_resource(struct device_node *dev, int index, int bar_no,
801 const char *name = NULL;
803 addrp = __of_get_address(dev, index, bar_no, &size, &flags);
807 /* Get optional "reg-names" property to add a name to a resource */
809 of_property_read_string_index(dev, "reg-names", index, &name);
811 if (flags & IORESOURCE_MEM)
812 taddr = of_translate_address(dev, addrp);
813 else if (flags & IORESOURCE_IO)
814 taddr = of_translate_ioport(dev, addrp, size);
818 if (taddr == OF_BAD_ADDR)
820 memset(r, 0, sizeof(struct resource));
822 if (of_mmio_is_nonposted(dev))
823 flags |= IORESOURCE_MEM_NONPOSTED;
826 r->end = taddr + size - 1;
828 r->name = name ? name : dev->full_name;
834 * of_address_to_resource - Translate device tree address and return as resource
835 * @dev: Caller's Device Node
836 * @index: Index into the array
837 * @r: Pointer to resource array
839 * Note that if your address is a PIO address, the conversion will fail if
840 * the physical address can't be internally converted to an IO token with
841 * pci_address_to_pio(), that is because it's either called too early or it
842 * can't be matched to any host bridge IO space
844 int of_address_to_resource(struct device_node *dev, int index,
847 return __of_address_to_resource(dev, index, -1, r);
849 EXPORT_SYMBOL_GPL(of_address_to_resource);
852 * of_iomap - Maps the memory mapped IO for a given device_node
853 * @np: the device whose io range will be mapped
854 * @index: index of the io range
856 * Returns a pointer to the mapped memory
858 void __iomem *of_iomap(struct device_node *np, int index)
862 if (of_address_to_resource(np, index, &res))
865 if (res.flags & IORESOURCE_MEM_NONPOSTED)
866 return ioremap_np(res.start, resource_size(&res));
868 return ioremap(res.start, resource_size(&res));
870 EXPORT_SYMBOL(of_iomap);
873 * of_io_request_and_map - Requests a resource and maps the memory mapped IO
874 * for a given device_node
875 * @device: the device whose io range will be mapped
876 * @index: index of the io range
877 * @name: name "override" for the memory region request or NULL
879 * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
880 * error code on failure. Usage example:
882 * base = of_io_request_and_map(node, 0, "foo");
884 * return PTR_ERR(base);
886 void __iomem *of_io_request_and_map(struct device_node *np, int index,
892 if (of_address_to_resource(np, index, &res))
893 return IOMEM_ERR_PTR(-EINVAL);
897 if (!request_mem_region(res.start, resource_size(&res), name))
898 return IOMEM_ERR_PTR(-EBUSY);
900 if (res.flags & IORESOURCE_MEM_NONPOSTED)
901 mem = ioremap_np(res.start, resource_size(&res));
903 mem = ioremap(res.start, resource_size(&res));
906 release_mem_region(res.start, resource_size(&res));
907 return IOMEM_ERR_PTR(-ENOMEM);
912 EXPORT_SYMBOL(of_io_request_and_map);
914 #ifdef CONFIG_HAS_DMA
916 * of_dma_get_range - Get DMA range info and put it into a map array
917 * @np: device node to get DMA range info
918 * @map: dma range structure to return
920 * Look in bottom up direction for the first "dma-ranges" property
921 * and parse it. Put the information into a DMA offset map array.
924 * DMA addr (dma_addr) : naddr cells
925 * CPU addr (phys_addr_t) : pna cells
928 * It returns -ENODEV if "dma-ranges" property was not found for this
931 int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
933 struct device_node *node = of_node_get(np);
934 const __be32 *ranges = NULL;
935 bool found_dma_ranges = false;
936 struct of_range_parser parser;
937 struct of_range range;
938 struct bus_dma_region *r;
939 int len, num_ranges = 0;
943 ranges = of_get_property(node, "dma-ranges", &len);
945 /* Ignore empty ranges, they imply no translation required */
946 if (ranges && len > 0)
949 /* Once we find 'dma-ranges', then a missing one is an error */
950 if (found_dma_ranges && !ranges) {
954 found_dma_ranges = true;
956 node = of_get_next_dma_parent(node);
959 if (!node || !ranges) {
960 pr_debug("no dma-ranges found for node(%pOF)\n", np);
965 of_dma_range_parser_init(&parser, node);
966 for_each_of_range(&parser, &range)
969 r = kcalloc(num_ranges + 1, sizeof(*r), GFP_KERNEL);
976 * Record all info in the generic DMA ranges array for struct device.
979 of_dma_range_parser_init(&parser, node);
980 for_each_of_range(&parser, &range) {
981 pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
982 range.bus_addr, range.cpu_addr, range.size);
983 if (range.cpu_addr == OF_BAD_ADDR) {
984 pr_err("translation of DMA address(%llx) to CPU address failed node(%pOF)\n",
985 range.bus_addr, node);
988 r->cpu_start = range.cpu_addr;
989 r->dma_start = range.bus_addr;
990 r->size = range.size;
991 r->offset = range.cpu_addr - range.bus_addr;
998 #endif /* CONFIG_HAS_DMA */
1001 * of_dma_get_max_cpu_address - Gets highest CPU address suitable for DMA
1002 * @np: The node to start searching from or NULL to start from the root
1004 * Gets the highest CPU physical address that is addressable by all DMA masters
1005 * in the sub-tree pointed by np, or the whole tree if NULL is passed. If no
1006 * DMA constrained device is found, it returns PHYS_ADDR_MAX.
1008 phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
1010 phys_addr_t max_cpu_addr = PHYS_ADDR_MAX;
1011 struct of_range_parser parser;
1012 phys_addr_t subtree_max_addr;
1013 struct device_node *child;
1014 struct of_range range;
1015 const __be32 *ranges;
1022 ranges = of_get_property(np, "dma-ranges", &len);
1023 if (ranges && len) {
1024 of_dma_range_parser_init(&parser, np);
1025 for_each_of_range(&parser, &range)
1026 if (range.cpu_addr + range.size > cpu_end)
1027 cpu_end = range.cpu_addr + range.size - 1;
1029 if (max_cpu_addr > cpu_end)
1030 max_cpu_addr = cpu_end;
1033 for_each_available_child_of_node(np, child) {
1034 subtree_max_addr = of_dma_get_max_cpu_address(child);
1035 if (max_cpu_addr > subtree_max_addr)
1036 max_cpu_addr = subtree_max_addr;
1039 return max_cpu_addr;
1043 * of_dma_is_coherent - Check if device is coherent
1046 * It returns true if "dma-coherent" property was found
1047 * for this device in the DT, or if DMA is coherent by
1048 * default for OF devices on the current platform.
1050 bool of_dma_is_coherent(struct device_node *np)
1052 struct device_node *node;
1054 if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT))
1057 node = of_node_get(np);
1060 if (of_property_read_bool(node, "dma-coherent")) {
1064 node = of_get_next_dma_parent(node);
1069 EXPORT_SYMBOL_GPL(of_dma_is_coherent);
1072 * of_mmio_is_nonposted - Check if device uses non-posted MMIO
1075 * Returns true if the "nonposted-mmio" property was found for
1078 * This is currently only enabled on builds that support Apple ARM devices, as
1081 static bool of_mmio_is_nonposted(struct device_node *np)
1083 struct device_node *parent;
1086 if (!IS_ENABLED(CONFIG_ARCH_APPLE))
1089 parent = of_get_parent(np);
1093 nonposted = of_property_read_bool(parent, "nonposted-mmio");
1095 of_node_put(parent);