blob: b55c2189076064c1d9a8015079370046ad8ae615 [file] [log] [blame]
Grant Likely6b884a82010-06-08 07:48:09 -06001
Arnd Bergmann5019f0b2012-04-11 17:30:11 +00002#include <linux/device.h>
Grant Likely6b884a82010-06-08 07:48:09 -06003#include <linux/io.h>
4#include <linux/ioport.h>
Grant Likelydbbdee92010-06-08 07:48:10 -06005#include <linux/module.h>
Grant Likely6b884a82010-06-08 07:48:09 -06006#include <linux/of_address.h>
Grant Likelydbbdee92010-06-08 07:48:10 -06007#include <linux/pci_regs.h>
8#include <linux/string.h>
Grant Likely6b884a82010-06-08 07:48:09 -06009
Grant Likelydbbdee92010-06-08 07:48:10 -060010/* Max address size we deal with */
11#define OF_MAX_ADDR_CELLS 4
Stephen Warren5d61b162012-07-25 17:34:37 -060012#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)
Grant Likelydbbdee92010-06-08 07:48:10 -060014
15static struct of_bus *of_match_bus(struct device_node *np);
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010016static int __of_address_to_resource(struct device_node *dev,
17 const __be32 *addrp, u64 size, unsigned int flags,
Benoit Cousson35f3da32011-12-05 15:23:55 +010018 const char *name, struct resource *r);
Grant Likelydbbdee92010-06-08 07:48:10 -060019
20/* Debug utility */
21#ifdef DEBUG
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010022static void of_dump_addr(const char *s, const __be32 *addr, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -060023{
24 printk(KERN_DEBUG "%s", s);
25 while (na--)
Grant Likely154063a92010-06-08 07:48:11 -060026 printk(" %08x", be32_to_cpu(*(addr++)));
Grant Likelydbbdee92010-06-08 07:48:10 -060027 printk("\n");
28}
29#else
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010030static void of_dump_addr(const char *s, const __be32 *addr, int na) { }
Grant Likelydbbdee92010-06-08 07:48:10 -060031#endif
32
33/* Callbacks for bus specific translators */
34struct of_bus {
35 const char *name;
36 const char *addresses;
37 int (*match)(struct device_node *parent);
38 void (*count_cells)(struct device_node *child,
39 int *addrc, int *sizec);
Kim Phillips47b1e682012-10-08 19:41:58 -050040 u64 (*map)(__be32 *addr, const __be32 *range,
Grant Likelydbbdee92010-06-08 07:48:10 -060041 int na, int ns, int pna);
Kim Phillips47b1e682012-10-08 19:41:58 -050042 int (*translate)(__be32 *addr, u64 offset, int na);
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010043 unsigned int (*get_flags)(const __be32 *addr);
Grant Likelydbbdee92010-06-08 07:48:10 -060044};
45
46/*
47 * Default translator (generic bus)
48 */
49
50static void of_bus_default_count_cells(struct device_node *dev,
51 int *addrc, int *sizec)
52{
53 if (addrc)
54 *addrc = of_n_addr_cells(dev);
55 if (sizec)
56 *sizec = of_n_size_cells(dev);
57}
58
Kim Phillips47b1e682012-10-08 19:41:58 -050059static u64 of_bus_default_map(__be32 *addr, const __be32 *range,
Grant Likelydbbdee92010-06-08 07:48:10 -060060 int na, int ns, int pna)
61{
62 u64 cp, s, da;
63
64 cp = of_read_number(range, na);
65 s = of_read_number(range + na + pna, ns);
66 da = of_read_number(addr, na);
67
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);
71
Thierry Redinge38c0a12012-07-26 21:55:10 +020072 /*
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.
76 */
77 if (na > 2 && memcmp(range, addr, na * 4) != 0)
78 return OF_BAD_ADDR;
79
Grant Likelydbbdee92010-06-08 07:48:10 -060080 if (da < cp || da >= (cp + s))
81 return OF_BAD_ADDR;
82 return da - cp;
83}
84
Kim Phillips47b1e682012-10-08 19:41:58 -050085static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -060086{
87 u64 a = of_read_number(addr, na);
88 memset(addr, 0, na * 4);
89 a += offset;
90 if (na > 1)
Grant Likely154063a92010-06-08 07:48:11 -060091 addr[na - 2] = cpu_to_be32(a >> 32);
92 addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
Grant Likelydbbdee92010-06-08 07:48:10 -060093
94 return 0;
95}
96
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010097static unsigned int of_bus_default_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -060098{
99 return IORESOURCE_MEM;
100}
101
102#ifdef CONFIG_PCI
103/*
104 * PCI bus specific translator
105 */
106
107static int of_bus_pci_match(struct device_node *np)
108{
Benjamin Herrenschmidt6dd18e42013-07-03 16:01:10 +1000109 /*
110 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
111 * "ht" is hypertransport
112 */
113 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci") ||
114 !strcmp(np->type, "ht");
Grant Likelydbbdee92010-06-08 07:48:10 -0600115}
116
117static void of_bus_pci_count_cells(struct device_node *np,
118 int *addrc, int *sizec)
119{
120 if (addrc)
121 *addrc = 3;
122 if (sizec)
123 *sizec = 2;
124}
125
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100126static unsigned int of_bus_pci_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600127{
128 unsigned int flags = 0;
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100129 u32 w = be32_to_cpup(addr);
Grant Likelydbbdee92010-06-08 07:48:10 -0600130
131 switch((w >> 24) & 0x03) {
132 case 0x01:
133 flags |= IORESOURCE_IO;
134 break;
135 case 0x02: /* 32 bits */
136 case 0x03: /* 64 bits */
137 flags |= IORESOURCE_MEM;
138 break;
139 }
140 if (w & 0x40000000)
141 flags |= IORESOURCE_PREFETCH;
142 return flags;
143}
144
Kim Phillips47b1e682012-10-08 19:41:58 -0500145static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100146 int pna)
Grant Likelydbbdee92010-06-08 07:48:10 -0600147{
148 u64 cp, s, da;
149 unsigned int af, rf;
150
151 af = of_bus_pci_get_flags(addr);
152 rf = of_bus_pci_get_flags(range);
153
154 /* Check address type match */
155 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
156 return OF_BAD_ADDR;
157
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);
162
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);
166
167 if (da < cp || da >= (cp + s))
168 return OF_BAD_ADDR;
169 return da - cp;
170}
171
Kim Phillips47b1e682012-10-08 19:41:58 -0500172static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -0600173{
174 return of_bus_default_translate(addr + 1, offset, na - 1);
175}
176
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100177const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
Grant Likelydbbdee92010-06-08 07:48:10 -0600178 unsigned int *flags)
179{
Jeremy Kerra9fadee2010-10-10 21:24:10 -0600180 const __be32 *prop;
Grant Likelydbbdee92010-06-08 07:48:10 -0600181 unsigned int psize;
182 struct device_node *parent;
183 struct of_bus *bus;
184 int onesize, i, na, ns;
185
186 /* Get parent & match bus type */
187 parent = of_get_parent(dev);
188 if (parent == NULL)
189 return NULL;
190 bus = of_match_bus(parent);
191 if (strcmp(bus->name, "pci")) {
192 of_node_put(parent);
193 return NULL;
194 }
195 bus->count_cells(dev, &na, &ns);
196 of_node_put(parent);
Stephen Warren5d61b162012-07-25 17:34:37 -0600197 if (!OF_CHECK_ADDR_COUNT(na))
Grant Likelydbbdee92010-06-08 07:48:10 -0600198 return NULL;
199
200 /* Get "reg" or "assigned-addresses" property */
201 prop = of_get_property(dev, bus->addresses, &psize);
202 if (prop == NULL)
203 return NULL;
204 psize /= 4;
205
206 onesize = na + ns;
Grant Likely154063a92010-06-08 07:48:11 -0600207 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)) {
Grant Likelydbbdee92010-06-08 07:48:10 -0600210 if (size)
211 *size = of_read_number(prop + na, ns);
212 if (flags)
213 *flags = bus->get_flags(prop);
214 return prop;
215 }
Grant Likely154063a92010-06-08 07:48:11 -0600216 }
Grant Likelydbbdee92010-06-08 07:48:10 -0600217 return NULL;
218}
219EXPORT_SYMBOL(of_get_pci_address);
220
221int of_pci_address_to_resource(struct device_node *dev, int bar,
222 struct resource *r)
223{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100224 const __be32 *addrp;
Grant Likelydbbdee92010-06-08 07:48:10 -0600225 u64 size;
226 unsigned int flags;
227
228 addrp = of_get_pci_address(dev, bar, &size, &flags);
229 if (addrp == NULL)
230 return -EINVAL;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100231 return __of_address_to_resource(dev, addrp, size, flags, NULL, r);
Grant Likelydbbdee92010-06-08 07:48:10 -0600232}
233EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
Andrew Murray29b635c2013-05-16 17:55:17 +0200234
235int of_pci_range_parser_init(struct of_pci_range_parser *parser,
236 struct device_node *node)
237{
238 const int na = 3, ns = 2;
239 int rlen;
240
241 parser->node = node;
242 parser->pna = of_n_addr_cells(node);
243 parser->np = parser->pna + na + ns;
244
245 parser->range = of_get_property(node, "ranges", &rlen);
246 if (parser->range == NULL)
247 return -ENOENT;
248
249 parser->end = parser->range + rlen / sizeof(__be32);
250
251 return 0;
252}
253EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
254
255struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
256 struct of_pci_range *range)
257{
258 const int na = 3, ns = 2;
259
260 if (!range)
261 return NULL;
262
263 if (!parser->range || parser->range + parser->np > parser->end)
264 return NULL;
265
266 range->pci_space = parser->range[0];
267 range->flags = of_bus_pci_get_flags(parser->range);
268 range->pci_addr = of_read_number(parser->range + 1, ns);
269 range->cpu_addr = of_translate_address(parser->node,
270 parser->range + na);
271 range->size = of_read_number(parser->range + parser->pna + na, ns);
272
273 parser->range += parser->np;
274
275 /* Now consume following elements while they are contiguous */
276 while (parser->range + parser->np <= parser->end) {
277 u32 flags, pci_space;
278 u64 pci_addr, cpu_addr, size;
279
280 pci_space = be32_to_cpup(parser->range);
281 flags = of_bus_pci_get_flags(parser->range);
282 pci_addr = of_read_number(parser->range + 1, ns);
283 cpu_addr = of_translate_address(parser->node,
284 parser->range + na);
285 size = of_read_number(parser->range + parser->pna + na, ns);
286
287 if (flags != range->flags)
288 break;
289 if (pci_addr != range->pci_addr + range->size ||
290 cpu_addr != range->cpu_addr + range->size)
291 break;
292
293 range->size += size;
294 parser->range += parser->np;
295 }
296
297 return range;
298}
299EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
300
Grant Likelydbbdee92010-06-08 07:48:10 -0600301#endif /* CONFIG_PCI */
302
303/*
304 * ISA bus specific translator
305 */
306
307static int of_bus_isa_match(struct device_node *np)
308{
309 return !strcmp(np->name, "isa");
310}
311
312static void of_bus_isa_count_cells(struct device_node *child,
313 int *addrc, int *sizec)
314{
315 if (addrc)
316 *addrc = 2;
317 if (sizec)
318 *sizec = 1;
319}
320
Kim Phillips47b1e682012-10-08 19:41:58 -0500321static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns,
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100322 int pna)
Grant Likelydbbdee92010-06-08 07:48:10 -0600323{
324 u64 cp, s, da;
325
326 /* Check address type match */
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100327 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
Grant Likelydbbdee92010-06-08 07:48:10 -0600328 return OF_BAD_ADDR;
329
330 /* Read address values, skipping high cell */
331 cp = of_read_number(range + 1, na - 1);
332 s = of_read_number(range + na + pna, ns);
333 da = of_read_number(addr + 1, na - 1);
334
335 pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n",
336 (unsigned long long)cp, (unsigned long long)s,
337 (unsigned long long)da);
338
339 if (da < cp || da >= (cp + s))
340 return OF_BAD_ADDR;
341 return da - cp;
342}
343
Kim Phillips47b1e682012-10-08 19:41:58 -0500344static int of_bus_isa_translate(__be32 *addr, u64 offset, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -0600345{
346 return of_bus_default_translate(addr + 1, offset, na - 1);
347}
348
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100349static unsigned int of_bus_isa_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600350{
351 unsigned int flags = 0;
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100352 u32 w = be32_to_cpup(addr);
Grant Likelydbbdee92010-06-08 07:48:10 -0600353
354 if (w & 1)
355 flags |= IORESOURCE_IO;
356 else
357 flags |= IORESOURCE_MEM;
358 return flags;
359}
360
361/*
362 * Array of bus specific translators
363 */
364
365static struct of_bus of_busses[] = {
366#ifdef CONFIG_PCI
367 /* PCI */
368 {
369 .name = "pci",
370 .addresses = "assigned-addresses",
371 .match = of_bus_pci_match,
372 .count_cells = of_bus_pci_count_cells,
373 .map = of_bus_pci_map,
374 .translate = of_bus_pci_translate,
375 .get_flags = of_bus_pci_get_flags,
376 },
377#endif /* CONFIG_PCI */
378 /* ISA */
379 {
380 .name = "isa",
381 .addresses = "reg",
382 .match = of_bus_isa_match,
383 .count_cells = of_bus_isa_count_cells,
384 .map = of_bus_isa_map,
385 .translate = of_bus_isa_translate,
386 .get_flags = of_bus_isa_get_flags,
387 },
388 /* Default */
389 {
390 .name = "default",
391 .addresses = "reg",
392 .match = NULL,
393 .count_cells = of_bus_default_count_cells,
394 .map = of_bus_default_map,
395 .translate = of_bus_default_translate,
396 .get_flags = of_bus_default_get_flags,
397 },
398};
399
400static struct of_bus *of_match_bus(struct device_node *np)
401{
402 int i;
403
404 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
405 if (!of_busses[i].match || of_busses[i].match(np))
406 return &of_busses[i];
407 BUG();
408 return NULL;
409}
410
411static int of_translate_one(struct device_node *parent, struct of_bus *bus,
Kim Phillips47b1e682012-10-08 19:41:58 -0500412 struct of_bus *pbus, __be32 *addr,
Grant Likelydbbdee92010-06-08 07:48:10 -0600413 int na, int ns, int pna, const char *rprop)
414{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100415 const __be32 *ranges;
Grant Likelydbbdee92010-06-08 07:48:10 -0600416 unsigned int rlen;
417 int rone;
418 u64 offset = OF_BAD_ADDR;
419
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 not 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.
Grant Likely3930f292010-06-08 07:48:11 -0600431 *
432 * As far as we know, this damage only exists on Apple machines, so
433 * This code is only enabled on powerpc. --gcl
Grant Likelydbbdee92010-06-08 07:48:10 -0600434 */
435 ranges = of_get_property(parent, rprop, &rlen);
Grant Likely3930f292010-06-08 07:48:11 -0600436#if !defined(CONFIG_PPC)
437 if (ranges == NULL) {
438 pr_err("OF: no ranges; cannot translate\n");
439 return 1;
440 }
441#endif /* !defined(CONFIG_PPC) */
Grant Likelydbbdee92010-06-08 07:48:10 -0600442 if (ranges == NULL || rlen == 0) {
443 offset = of_read_number(addr, na);
444 memset(addr, 0, pna * 4);
Grant Likely3930f292010-06-08 07:48:11 -0600445 pr_debug("OF: empty ranges; 1:1 translation\n");
Grant Likelydbbdee92010-06-08 07:48:10 -0600446 goto finish;
447 }
448
449 pr_debug("OF: walking ranges...\n");
450
451 /* Now walk through the ranges */
452 rlen /= 4;
453 rone = na + pna + ns;
454 for (; rlen >= rone; rlen -= rone, ranges += rone) {
455 offset = bus->map(addr, ranges, na, ns, pna);
456 if (offset != OF_BAD_ADDR)
457 break;
458 }
459 if (offset == OF_BAD_ADDR) {
460 pr_debug("OF: not found !\n");
461 return 1;
462 }
463 memcpy(addr, ranges + na, 4 * pna);
464
465 finish:
466 of_dump_addr("OF: parent translation for:", addr, pna);
467 pr_debug("OF: with offset: %llx\n", (unsigned long long)offset);
468
469 /* Translate it into parent bus space */
470 return pbus->translate(addr, offset, pna);
471}
472
473/*
474 * Translate an address from the device-tree into a CPU physical address,
475 * this walks up the tree and applies the various bus mappings on the
476 * way.
477 *
478 * Note: We consider that crossing any level with #size-cells == 0 to mean
479 * that translation is impossible (that is we are not dealing with a value
480 * that can be mapped to a cpu physical address). This is not really specified
481 * that way, but this is traditionally the way IBM at least do things
482 */
Kim Phillips47b1e682012-10-08 19:41:58 -0500483static u64 __of_translate_address(struct device_node *dev,
484 const __be32 *in_addr, const char *rprop)
Grant Likelydbbdee92010-06-08 07:48:10 -0600485{
486 struct device_node *parent = NULL;
487 struct of_bus *bus, *pbus;
Kim Phillips47b1e682012-10-08 19:41:58 -0500488 __be32 addr[OF_MAX_ADDR_CELLS];
Grant Likelydbbdee92010-06-08 07:48:10 -0600489 int na, ns, pna, pns;
490 u64 result = OF_BAD_ADDR;
491
492 pr_debug("OF: ** translation for device %s **\n", dev->full_name);
493
494 /* Increase refcount at current level */
495 of_node_get(dev);
496
497 /* Get parent & match bus type */
498 parent = of_get_parent(dev);
499 if (parent == NULL)
500 goto bail;
501 bus = of_match_bus(parent);
502
Andrew Murray59f5ca42012-12-13 10:11:23 +0000503 /* Count address cells & copy address locally */
Grant Likelydbbdee92010-06-08 07:48:10 -0600504 bus->count_cells(dev, &na, &ns);
505 if (!OF_CHECK_COUNTS(na, ns)) {
506 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
507 dev->full_name);
508 goto bail;
509 }
510 memcpy(addr, in_addr, na * 4);
511
512 pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
513 bus->name, na, ns, parent->full_name);
514 of_dump_addr("OF: translating address:", addr, na);
515
516 /* Translate */
517 for (;;) {
518 /* Switch to parent bus */
519 of_node_put(dev);
520 dev = parent;
521 parent = of_get_parent(dev);
522
523 /* If root, we have finished */
524 if (parent == NULL) {
525 pr_debug("OF: reached root node\n");
526 result = of_read_number(addr, na);
527 break;
528 }
529
530 /* Get new parent bus and counts */
531 pbus = of_match_bus(parent);
532 pbus->count_cells(dev, &pna, &pns);
533 if (!OF_CHECK_COUNTS(pna, pns)) {
534 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
535 dev->full_name);
536 break;
537 }
538
539 pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
540 pbus->name, pna, pns, parent->full_name);
541
542 /* Apply bus translation */
543 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
544 break;
545
546 /* Complete the move up one level */
547 na = pna;
548 ns = pns;
549 bus = pbus;
550
551 of_dump_addr("OF: one level translation:", addr, na);
552 }
553 bail:
554 of_node_put(parent);
555 of_node_put(dev);
556
557 return result;
558}
559
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100560u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600561{
562 return __of_translate_address(dev, in_addr, "ranges");
563}
564EXPORT_SYMBOL(of_translate_address);
565
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100566u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600567{
568 return __of_translate_address(dev, in_addr, "dma-ranges");
569}
570EXPORT_SYMBOL(of_translate_dma_address);
571
Stephen Warren5d61b162012-07-25 17:34:37 -0600572bool of_can_translate_address(struct device_node *dev)
573{
574 struct device_node *parent;
575 struct of_bus *bus;
576 int na, ns;
577
578 parent = of_get_parent(dev);
579 if (parent == NULL)
580 return false;
581
582 bus = of_match_bus(parent);
583 bus->count_cells(dev, &na, &ns);
584
585 of_node_put(parent);
586
587 return OF_CHECK_COUNTS(na, ns);
588}
589EXPORT_SYMBOL(of_can_translate_address);
590
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100591const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
Grant Likelydbbdee92010-06-08 07:48:10 -0600592 unsigned int *flags)
593{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100594 const __be32 *prop;
Grant Likelydbbdee92010-06-08 07:48:10 -0600595 unsigned int psize;
596 struct device_node *parent;
597 struct of_bus *bus;
598 int onesize, i, na, ns;
599
600 /* Get parent & match bus type */
601 parent = of_get_parent(dev);
602 if (parent == NULL)
603 return NULL;
604 bus = of_match_bus(parent);
605 bus->count_cells(dev, &na, &ns);
606 of_node_put(parent);
Stephen Warren5d61b162012-07-25 17:34:37 -0600607 if (!OF_CHECK_ADDR_COUNT(na))
Grant Likelydbbdee92010-06-08 07:48:10 -0600608 return NULL;
609
610 /* Get "reg" or "assigned-addresses" property */
611 prop = of_get_property(dev, bus->addresses, &psize);
612 if (prop == NULL)
613 return NULL;
614 psize /= 4;
615
616 onesize = na + ns;
617 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
618 if (i == index) {
619 if (size)
620 *size = of_read_number(prop + na, ns);
621 if (flags)
622 *flags = bus->get_flags(prop);
623 return prop;
624 }
625 return NULL;
626}
627EXPORT_SYMBOL(of_get_address);
628
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100629static int __of_address_to_resource(struct device_node *dev,
630 const __be32 *addrp, u64 size, unsigned int flags,
Benoit Cousson35f3da32011-12-05 15:23:55 +0100631 const char *name, struct resource *r)
Grant Likely1f5bef32010-06-08 07:48:09 -0600632{
633 u64 taddr;
634
635 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
636 return -EINVAL;
637 taddr = of_translate_address(dev, addrp);
638 if (taddr == OF_BAD_ADDR)
639 return -EINVAL;
640 memset(r, 0, sizeof(struct resource));
641 if (flags & IORESOURCE_IO) {
642 unsigned long port;
643 port = pci_address_to_pio(taddr);
644 if (port == (unsigned long)-1)
645 return -EINVAL;
646 r->start = port;
647 r->end = port + size - 1;
648 } else {
649 r->start = taddr;
650 r->end = taddr + size - 1;
651 }
652 r->flags = flags;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100653 r->name = name ? name : dev->full_name;
654
Grant Likely1f5bef32010-06-08 07:48:09 -0600655 return 0;
656}
657
658/**
659 * of_address_to_resource - Translate device tree address and return as resource
660 *
661 * Note that if your address is a PIO address, the conversion will fail if
662 * the physical address can't be internally converted to an IO token with
663 * pci_address_to_pio(), that is because it's either called to early or it
664 * can't be matched to any host bridge IO space
665 */
666int of_address_to_resource(struct device_node *dev, int index,
667 struct resource *r)
668{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100669 const __be32 *addrp;
Grant Likely1f5bef32010-06-08 07:48:09 -0600670 u64 size;
671 unsigned int flags;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100672 const char *name = NULL;
Grant Likely1f5bef32010-06-08 07:48:09 -0600673
674 addrp = of_get_address(dev, index, &size, &flags);
675 if (addrp == NULL)
676 return -EINVAL;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100677
678 /* Get optional "reg-names" property to add a name to a resource */
679 of_property_read_string_index(dev, "reg-names", index, &name);
680
681 return __of_address_to_resource(dev, addrp, size, flags, name, r);
Grant Likely1f5bef32010-06-08 07:48:09 -0600682}
683EXPORT_SYMBOL_GPL(of_address_to_resource);
684
Grant Likely90e33f62011-07-05 23:42:28 -0600685struct device_node *of_find_matching_node_by_address(struct device_node *from,
686 const struct of_device_id *matches,
687 u64 base_address)
688{
689 struct device_node *dn = of_find_matching_node(from, matches);
690 struct resource res;
691
692 while (dn) {
693 if (of_address_to_resource(dn, 0, &res))
694 continue;
695 if (res.start == base_address)
696 return dn;
697 dn = of_find_matching_node(dn, matches);
698 }
699
700 return NULL;
701}
702
Grant Likely1f5bef32010-06-08 07:48:09 -0600703
Grant Likely6b884a82010-06-08 07:48:09 -0600704/**
705 * of_iomap - Maps the memory mapped IO for a given device_node
706 * @device: the device whose io range will be mapped
707 * @index: index of the io range
708 *
709 * Returns a pointer to the mapped memory
710 */
711void __iomem *of_iomap(struct device_node *np, int index)
712{
713 struct resource res;
714
715 if (of_address_to_resource(np, index, &res))
716 return NULL;
717
Felipe Balbi28c1b6d2011-07-22 22:47:21 +0300718 return ioremap(res.start, resource_size(&res));
Grant Likely6b884a82010-06-08 07:48:09 -0600719}
720EXPORT_SYMBOL(of_iomap);