2 #include <linux/device.h>
4 #include <linux/ioport.h>
5 #include <linux/module.h>
6 #include <linux/of_address.h>
7 #include <linux/pci_regs.h>
8 #include <linux/string.h>
10 /* Max address size we deal with */
11 #define OF_MAX_ADDR_CELLS 4
12 #define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
13 #define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0)
15 static struct of_bus *of_match_bus(struct device_node *np);
16 static int __of_address_to_resource(struct device_node *dev,
17 const __be32 *addrp, u64 size, unsigned int flags,
18 const char *name, struct resource *r);
22 static void of_dump_addr(const char *s, const __be32 *addr, int na)
24 printk(KERN_DEBUG "%s", s);
26 printk(" %08x", be32_to_cpu(*(addr++)));
30 static void of_dump_addr(const char *s, const __be32 *addr, int na) { }
33 /* Callbacks for bus specific translators */
36 const char *addresses;
37 int (*match)(struct device_node *parent);
38 void (*count_cells)(struct device_node *child,
39 int *addrc, int *sizec);
40 u64 (*map)(__be32 *addr, const __be32 *range,
41 int na, int ns, int pna);
42 int (*translate)(__be32 *addr, u64 offset, int na);
43 unsigned int (*get_flags)(const __be32 *addr);
47 * Default translator (generic bus)
50 static void of_bus_default_count_cells(struct device_node *dev,
51 int *addrc, int *sizec)
54 *addrc = of_n_addr_cells(dev);
56 *sizec = of_n_size_cells(dev);
59 static u64 of_bus_default_map(__be32 *addr, const __be32 *range,
60 int na, int ns, int pna)
64 cp = of_read_number(range, na);
65 s = of_read_number(range + na + pna, ns);
66 da = of_read_number(addr, na);
68 pr_debug("OF: default map, cp=%llx, s=%llx, da=%llx\n",
69 (unsigned long long)cp, (unsigned long long)s,
70 (unsigned long long)da);
73 * If the number of address cells is larger than 2 we assume the
74 * mapping doesn't specify a physical address. Rather, the address
75 * specifies an identifier that must match exactly.
77 if (na > 2 && memcmp(range, addr, na * 4) != 0)
80 if (da < cp || da >= (cp + s))
85 static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
87 u64 a = of_read_number(addr, na);
88 memset(addr, 0, na * 4);
91 addr[na - 2] = cpu_to_be32(a >> 32);
92 addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
97 static unsigned int of_bus_default_get_flags(const __be32 *addr)
99 return IORESOURCE_MEM;
104 * PCI bus specific translator
107 static int of_bus_pci_match(struct device_node *np)
110 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
111 * "ht" is hypertransport
113 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci") ||
114 !strcmp(np->type, "ht");
117 static void of_bus_pci_count_cells(struct device_node *np,
118 int *addrc, int *sizec)
126 static unsigned int of_bus_pci_get_flags(const __be32 *addr)
128 unsigned int flags = 0;
129 u32 w = be32_to_cpup(addr);
131 switch((w >> 24) & 0x03) {
133 flags |= IORESOURCE_IO;
135 case 0x02: /* 32 bits */
136 case 0x03: /* 64 bits */
137 flags |= IORESOURCE_MEM;
141 flags |= IORESOURCE_PREFETCH;
145 static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
151 af = of_bus_pci_get_flags(addr);
152 rf = of_bus_pci_get_flags(range);
154 /* Check address type match */
155 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
158 /* Read address values, skipping high cell */
159 cp = of_read_number(range + 1, na - 1);
160 s = of_read_number(range + na + pna, ns);
161 da = of_read_number(addr + 1, na - 1);
163 pr_debug("OF: PCI map, cp=%llx, s=%llx, da=%llx\n",
164 (unsigned long long)cp, (unsigned long long)s,
165 (unsigned long long)da);
167 if (da < cp || da >= (cp + s))
172 static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
174 return of_bus_default_translate(addr + 1, offset, na - 1);
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);
234 #endif /* CONFIG_PCI */
237 * ISA bus specific translator
240 static int of_bus_isa_match(struct device_node *np)
242 return !strcmp(np->name, "isa");
245 static void of_bus_isa_count_cells(struct device_node *child,
246 int *addrc, int *sizec)
254 static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns,
259 /* Check address type match */
260 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
263 /* Read address values, skipping high cell */
264 cp = of_read_number(range + 1, na - 1);
265 s = of_read_number(range + na + pna, ns);
266 da = of_read_number(addr + 1, na - 1);
268 pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n",
269 (unsigned long long)cp, (unsigned long long)s,
270 (unsigned long long)da);
272 if (da < cp || da >= (cp + s))
277 static int of_bus_isa_translate(__be32 *addr, u64 offset, int na)
279 return of_bus_default_translate(addr + 1, offset, na - 1);
282 static unsigned int of_bus_isa_get_flags(const __be32 *addr)
284 unsigned int flags = 0;
285 u32 w = be32_to_cpup(addr);
288 flags |= IORESOURCE_IO;
290 flags |= IORESOURCE_MEM;
295 * Array of bus specific translators
298 static struct of_bus of_busses[] = {
303 .addresses = "assigned-addresses",
304 .match = of_bus_pci_match,
305 .count_cells = of_bus_pci_count_cells,
306 .map = of_bus_pci_map,
307 .translate = of_bus_pci_translate,
308 .get_flags = of_bus_pci_get_flags,
310 #endif /* CONFIG_PCI */
315 .match = of_bus_isa_match,
316 .count_cells = of_bus_isa_count_cells,
317 .map = of_bus_isa_map,
318 .translate = of_bus_isa_translate,
319 .get_flags = of_bus_isa_get_flags,
326 .count_cells = of_bus_default_count_cells,
327 .map = of_bus_default_map,
328 .translate = of_bus_default_translate,
329 .get_flags = of_bus_default_get_flags,
333 static struct of_bus *of_match_bus(struct device_node *np)
337 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
338 if (!of_busses[i].match || of_busses[i].match(np))
339 return &of_busses[i];
344 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
345 struct of_bus *pbus, __be32 *addr,
346 int na, int ns, int pna, const char *rprop)
348 const __be32 *ranges;
351 u64 offset = OF_BAD_ADDR;
353 /* Normally, an absence of a "ranges" property means we are
354 * crossing a non-translatable boundary, and thus the addresses
355 * below the current not cannot be converted to CPU physical ones.
356 * Unfortunately, while this is very clear in the spec, it's not
357 * what Apple understood, and they do have things like /uni-n or
358 * /ht nodes with no "ranges" property and a lot of perfectly
359 * useable mapped devices below them. Thus we treat the absence of
360 * "ranges" as equivalent to an empty "ranges" property which means
361 * a 1:1 translation at that level. It's up to the caller not to try
362 * to translate addresses that aren't supposed to be translated in
363 * the first place. --BenH.
365 * As far as we know, this damage only exists on Apple machines, so
366 * This code is only enabled on powerpc. --gcl
368 ranges = of_get_property(parent, rprop, &rlen);
369 #if !defined(CONFIG_PPC)
370 if (ranges == NULL) {
371 pr_err("OF: no ranges; cannot translate\n");
374 #endif /* !defined(CONFIG_PPC) */
375 if (ranges == NULL || rlen == 0) {
376 offset = of_read_number(addr, na);
377 memset(addr, 0, pna * 4);
378 pr_debug("OF: empty ranges; 1:1 translation\n");
382 pr_debug("OF: walking ranges...\n");
384 /* Now walk through the ranges */
386 rone = na + pna + ns;
387 for (; rlen >= rone; rlen -= rone, ranges += rone) {
388 offset = bus->map(addr, ranges, na, ns, pna);
389 if (offset != OF_BAD_ADDR)
392 if (offset == OF_BAD_ADDR) {
393 pr_debug("OF: not found !\n");
396 memcpy(addr, ranges + na, 4 * pna);
399 of_dump_addr("OF: parent translation for:", addr, pna);
400 pr_debug("OF: with offset: %llx\n", (unsigned long long)offset);
402 /* Translate it into parent bus space */
403 return pbus->translate(addr, offset, pna);
407 * Translate an address from the device-tree into a CPU physical address,
408 * this walks up the tree and applies the various bus mappings on the
411 * Note: We consider that crossing any level with #size-cells == 0 to mean
412 * that translation is impossible (that is we are not dealing with a value
413 * that can be mapped to a cpu physical address). This is not really specified
414 * that way, but this is traditionally the way IBM at least do things
416 static u64 __of_translate_address(struct device_node *dev,
417 const __be32 *in_addr, const char *rprop)
419 struct device_node *parent = NULL;
420 struct of_bus *bus, *pbus;
421 __be32 addr[OF_MAX_ADDR_CELLS];
422 int na, ns, pna, pns;
423 u64 result = OF_BAD_ADDR;
425 pr_debug("OF: ** translation for device %s **\n", dev->full_name);
427 /* Increase refcount at current level */
430 /* Get parent & match bus type */
431 parent = of_get_parent(dev);
434 bus = of_match_bus(parent);
436 /* Count address cells & copy address locally */
437 bus->count_cells(dev, &na, &ns);
438 if (!OF_CHECK_COUNTS(na, ns)) {
439 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
443 memcpy(addr, in_addr, na * 4);
445 pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
446 bus->name, na, ns, parent->full_name);
447 of_dump_addr("OF: translating address:", addr, na);
451 /* Switch to parent bus */
454 parent = of_get_parent(dev);
456 /* If root, we have finished */
457 if (parent == NULL) {
458 pr_debug("OF: reached root node\n");
459 result = of_read_number(addr, na);
463 /* Get new parent bus and counts */
464 pbus = of_match_bus(parent);
465 pbus->count_cells(dev, &pna, &pns);
466 if (!OF_CHECK_COUNTS(pna, pns)) {
467 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
472 pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
473 pbus->name, pna, pns, parent->full_name);
475 /* Apply bus translation */
476 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
479 /* Complete the move up one level */
484 of_dump_addr("OF: one level translation:", addr, na);
493 u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
495 return __of_translate_address(dev, in_addr, "ranges");
497 EXPORT_SYMBOL(of_translate_address);
499 u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
501 return __of_translate_address(dev, in_addr, "dma-ranges");
503 EXPORT_SYMBOL(of_translate_dma_address);
505 bool of_can_translate_address(struct device_node *dev)
507 struct device_node *parent;
511 parent = of_get_parent(dev);
515 bus = of_match_bus(parent);
516 bus->count_cells(dev, &na, &ns);
520 return OF_CHECK_COUNTS(na, ns);
522 EXPORT_SYMBOL(of_can_translate_address);
524 const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
529 struct device_node *parent;
531 int onesize, i, na, ns;
533 /* Get parent & match bus type */
534 parent = of_get_parent(dev);
537 bus = of_match_bus(parent);
538 bus->count_cells(dev, &na, &ns);
540 if (!OF_CHECK_ADDR_COUNT(na))
543 /* Get "reg" or "assigned-addresses" property */
544 prop = of_get_property(dev, bus->addresses, &psize);
550 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
553 *size = of_read_number(prop + na, ns);
555 *flags = bus->get_flags(prop);
560 EXPORT_SYMBOL(of_get_address);
562 static int __of_address_to_resource(struct device_node *dev,
563 const __be32 *addrp, u64 size, unsigned int flags,
564 const char *name, struct resource *r)
568 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
570 taddr = of_translate_address(dev, addrp);
571 if (taddr == OF_BAD_ADDR)
573 memset(r, 0, sizeof(struct resource));
574 if (flags & IORESOURCE_IO) {
576 port = pci_address_to_pio(taddr);
577 if (port == (unsigned long)-1)
580 r->end = port + size - 1;
583 r->end = taddr + size - 1;
586 r->name = name ? name : dev->full_name;
592 * of_address_to_resource - Translate device tree address and return as resource
594 * Note that if your address is a PIO address, the conversion will fail if
595 * the physical address can't be internally converted to an IO token with
596 * pci_address_to_pio(), that is because it's either called to early or it
597 * can't be matched to any host bridge IO space
599 int of_address_to_resource(struct device_node *dev, int index,
605 const char *name = NULL;
607 addrp = of_get_address(dev, index, &size, &flags);
611 /* Get optional "reg-names" property to add a name to a resource */
612 of_property_read_string_index(dev, "reg-names", index, &name);
614 return __of_address_to_resource(dev, addrp, size, flags, name, r);
616 EXPORT_SYMBOL_GPL(of_address_to_resource);
618 struct device_node *of_find_matching_node_by_address(struct device_node *from,
619 const struct of_device_id *matches,
622 struct device_node *dn = of_find_matching_node(from, matches);
626 if (of_address_to_resource(dn, 0, &res))
628 if (res.start == base_address)
630 dn = of_find_matching_node(dn, matches);
638 * of_iomap - Maps the memory mapped IO for a given device_node
639 * @device: the device whose io range will be mapped
640 * @index: index of the io range
642 * Returns a pointer to the mapped memory
644 void __iomem *of_iomap(struct device_node *np, int index)
648 if (of_address_to_resource(np, index, &res))
651 return ioremap(res.start, resource_size(&res));
653 EXPORT_SYMBOL(of_iomap);