blob: 7e262a6124c5919a495545bb1f7402ae4350295a [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
12#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
13 (ns) > 0)
14
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);
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010040 u64 (*map)(u32 *addr, const __be32 *range,
Grant Likelydbbdee92010-06-08 07:48:10 -060041 int na, int ns, int pna);
42 int (*translate)(u32 *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
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010059static u64 of_bus_default_map(u32 *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
72 if (da < cp || da >= (cp + s))
73 return OF_BAD_ADDR;
74 return da - cp;
75}
76
77static int of_bus_default_translate(u32 *addr, u64 offset, int na)
78{
79 u64 a = of_read_number(addr, na);
80 memset(addr, 0, na * 4);
81 a += offset;
82 if (na > 1)
Grant Likely154063a92010-06-08 07:48:11 -060083 addr[na - 2] = cpu_to_be32(a >> 32);
84 addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
Grant Likelydbbdee92010-06-08 07:48:10 -060085
86 return 0;
87}
88
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +010089static unsigned int of_bus_default_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -060090{
91 return IORESOURCE_MEM;
92}
93
94#ifdef CONFIG_PCI
95/*
96 * PCI bus specific translator
97 */
98
99static int of_bus_pci_match(struct device_node *np)
100{
101 /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
102 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
103}
104
105static void of_bus_pci_count_cells(struct device_node *np,
106 int *addrc, int *sizec)
107{
108 if (addrc)
109 *addrc = 3;
110 if (sizec)
111 *sizec = 2;
112}
113
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100114static unsigned int of_bus_pci_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600115{
116 unsigned int flags = 0;
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100117 u32 w = be32_to_cpup(addr);
Grant Likelydbbdee92010-06-08 07:48:10 -0600118
119 switch((w >> 24) & 0x03) {
120 case 0x01:
121 flags |= IORESOURCE_IO;
122 break;
123 case 0x02: /* 32 bits */
124 case 0x03: /* 64 bits */
125 flags |= IORESOURCE_MEM;
126 break;
127 }
128 if (w & 0x40000000)
129 flags |= IORESOURCE_PREFETCH;
130 return flags;
131}
132
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100133static u64 of_bus_pci_map(u32 *addr, const __be32 *range, int na, int ns,
134 int pna)
Grant Likelydbbdee92010-06-08 07:48:10 -0600135{
136 u64 cp, s, da;
137 unsigned int af, rf;
138
139 af = of_bus_pci_get_flags(addr);
140 rf = of_bus_pci_get_flags(range);
141
142 /* Check address type match */
143 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
144 return OF_BAD_ADDR;
145
146 /* Read address values, skipping high cell */
147 cp = of_read_number(range + 1, na - 1);
148 s = of_read_number(range + na + pna, ns);
149 da = of_read_number(addr + 1, na - 1);
150
151 pr_debug("OF: PCI map, cp=%llx, s=%llx, da=%llx\n",
152 (unsigned long long)cp, (unsigned long long)s,
153 (unsigned long long)da);
154
155 if (da < cp || da >= (cp + s))
156 return OF_BAD_ADDR;
157 return da - cp;
158}
159
160static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
161{
162 return of_bus_default_translate(addr + 1, offset, na - 1);
163}
164
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100165const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
Grant Likelydbbdee92010-06-08 07:48:10 -0600166 unsigned int *flags)
167{
Jeremy Kerra9fadee2010-10-10 21:24:10 -0600168 const __be32 *prop;
Grant Likelydbbdee92010-06-08 07:48:10 -0600169 unsigned int psize;
170 struct device_node *parent;
171 struct of_bus *bus;
172 int onesize, i, na, ns;
173
174 /* Get parent & match bus type */
175 parent = of_get_parent(dev);
176 if (parent == NULL)
177 return NULL;
178 bus = of_match_bus(parent);
179 if (strcmp(bus->name, "pci")) {
180 of_node_put(parent);
181 return NULL;
182 }
183 bus->count_cells(dev, &na, &ns);
184 of_node_put(parent);
185 if (!OF_CHECK_COUNTS(na, ns))
186 return NULL;
187
188 /* Get "reg" or "assigned-addresses" property */
189 prop = of_get_property(dev, bus->addresses, &psize);
190 if (prop == NULL)
191 return NULL;
192 psize /= 4;
193
194 onesize = na + ns;
Grant Likely154063a92010-06-08 07:48:11 -0600195 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) {
196 u32 val = be32_to_cpu(prop[0]);
197 if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
Grant Likelydbbdee92010-06-08 07:48:10 -0600198 if (size)
199 *size = of_read_number(prop + na, ns);
200 if (flags)
201 *flags = bus->get_flags(prop);
202 return prop;
203 }
Grant Likely154063a92010-06-08 07:48:11 -0600204 }
Grant Likelydbbdee92010-06-08 07:48:10 -0600205 return NULL;
206}
207EXPORT_SYMBOL(of_get_pci_address);
208
209int of_pci_address_to_resource(struct device_node *dev, int bar,
210 struct resource *r)
211{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100212 const __be32 *addrp;
Grant Likelydbbdee92010-06-08 07:48:10 -0600213 u64 size;
214 unsigned int flags;
215
216 addrp = of_get_pci_address(dev, bar, &size, &flags);
217 if (addrp == NULL)
218 return -EINVAL;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100219 return __of_address_to_resource(dev, addrp, size, flags, NULL, r);
Grant Likelydbbdee92010-06-08 07:48:10 -0600220}
221EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
222#endif /* CONFIG_PCI */
223
224/*
225 * ISA bus specific translator
226 */
227
228static int of_bus_isa_match(struct device_node *np)
229{
230 return !strcmp(np->name, "isa");
231}
232
233static void of_bus_isa_count_cells(struct device_node *child,
234 int *addrc, int *sizec)
235{
236 if (addrc)
237 *addrc = 2;
238 if (sizec)
239 *sizec = 1;
240}
241
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100242static u64 of_bus_isa_map(u32 *addr, const __be32 *range, int na, int ns,
243 int pna)
Grant Likelydbbdee92010-06-08 07:48:10 -0600244{
245 u64 cp, s, da;
246
247 /* Check address type match */
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100248 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
Grant Likelydbbdee92010-06-08 07:48:10 -0600249 return OF_BAD_ADDR;
250
251 /* Read address values, skipping high cell */
252 cp = of_read_number(range + 1, na - 1);
253 s = of_read_number(range + na + pna, ns);
254 da = of_read_number(addr + 1, na - 1);
255
256 pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n",
257 (unsigned long long)cp, (unsigned long long)s,
258 (unsigned long long)da);
259
260 if (da < cp || da >= (cp + s))
261 return OF_BAD_ADDR;
262 return da - cp;
263}
264
265static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
266{
267 return of_bus_default_translate(addr + 1, offset, na - 1);
268}
269
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100270static unsigned int of_bus_isa_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600271{
272 unsigned int flags = 0;
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100273 u32 w = be32_to_cpup(addr);
Grant Likelydbbdee92010-06-08 07:48:10 -0600274
275 if (w & 1)
276 flags |= IORESOURCE_IO;
277 else
278 flags |= IORESOURCE_MEM;
279 return flags;
280}
281
282/*
283 * Array of bus specific translators
284 */
285
286static struct of_bus of_busses[] = {
287#ifdef CONFIG_PCI
288 /* PCI */
289 {
290 .name = "pci",
291 .addresses = "assigned-addresses",
292 .match = of_bus_pci_match,
293 .count_cells = of_bus_pci_count_cells,
294 .map = of_bus_pci_map,
295 .translate = of_bus_pci_translate,
296 .get_flags = of_bus_pci_get_flags,
297 },
298#endif /* CONFIG_PCI */
299 /* ISA */
300 {
301 .name = "isa",
302 .addresses = "reg",
303 .match = of_bus_isa_match,
304 .count_cells = of_bus_isa_count_cells,
305 .map = of_bus_isa_map,
306 .translate = of_bus_isa_translate,
307 .get_flags = of_bus_isa_get_flags,
308 },
309 /* Default */
310 {
311 .name = "default",
312 .addresses = "reg",
313 .match = NULL,
314 .count_cells = of_bus_default_count_cells,
315 .map = of_bus_default_map,
316 .translate = of_bus_default_translate,
317 .get_flags = of_bus_default_get_flags,
318 },
319};
320
321static struct of_bus *of_match_bus(struct device_node *np)
322{
323 int i;
324
325 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
326 if (!of_busses[i].match || of_busses[i].match(np))
327 return &of_busses[i];
328 BUG();
329 return NULL;
330}
331
332static int of_translate_one(struct device_node *parent, struct of_bus *bus,
333 struct of_bus *pbus, u32 *addr,
334 int na, int ns, int pna, const char *rprop)
335{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100336 const __be32 *ranges;
Grant Likelydbbdee92010-06-08 07:48:10 -0600337 unsigned int rlen;
338 int rone;
339 u64 offset = OF_BAD_ADDR;
340
341 /* Normally, an absence of a "ranges" property means we are
342 * crossing a non-translatable boundary, and thus the addresses
343 * below the current not cannot be converted to CPU physical ones.
344 * Unfortunately, while this is very clear in the spec, it's not
345 * what Apple understood, and they do have things like /uni-n or
346 * /ht nodes with no "ranges" property and a lot of perfectly
347 * useable mapped devices below them. Thus we treat the absence of
348 * "ranges" as equivalent to an empty "ranges" property which means
349 * a 1:1 translation at that level. It's up to the caller not to try
350 * to translate addresses that aren't supposed to be translated in
351 * the first place. --BenH.
Grant Likely3930f292010-06-08 07:48:11 -0600352 *
353 * As far as we know, this damage only exists on Apple machines, so
354 * This code is only enabled on powerpc. --gcl
Grant Likelydbbdee92010-06-08 07:48:10 -0600355 */
356 ranges = of_get_property(parent, rprop, &rlen);
Grant Likely3930f292010-06-08 07:48:11 -0600357#if !defined(CONFIG_PPC)
358 if (ranges == NULL) {
359 pr_err("OF: no ranges; cannot translate\n");
360 return 1;
361 }
362#endif /* !defined(CONFIG_PPC) */
Grant Likelydbbdee92010-06-08 07:48:10 -0600363 if (ranges == NULL || rlen == 0) {
364 offset = of_read_number(addr, na);
365 memset(addr, 0, pna * 4);
Grant Likely3930f292010-06-08 07:48:11 -0600366 pr_debug("OF: empty ranges; 1:1 translation\n");
Grant Likelydbbdee92010-06-08 07:48:10 -0600367 goto finish;
368 }
369
370 pr_debug("OF: walking ranges...\n");
371
372 /* Now walk through the ranges */
373 rlen /= 4;
374 rone = na + pna + ns;
375 for (; rlen >= rone; rlen -= rone, ranges += rone) {
376 offset = bus->map(addr, ranges, na, ns, pna);
377 if (offset != OF_BAD_ADDR)
378 break;
379 }
380 if (offset == OF_BAD_ADDR) {
381 pr_debug("OF: not found !\n");
382 return 1;
383 }
384 memcpy(addr, ranges + na, 4 * pna);
385
386 finish:
387 of_dump_addr("OF: parent translation for:", addr, pna);
388 pr_debug("OF: with offset: %llx\n", (unsigned long long)offset);
389
390 /* Translate it into parent bus space */
391 return pbus->translate(addr, offset, pna);
392}
393
394/*
395 * Translate an address from the device-tree into a CPU physical address,
396 * this walks up the tree and applies the various bus mappings on the
397 * way.
398 *
399 * Note: We consider that crossing any level with #size-cells == 0 to mean
400 * that translation is impossible (that is we are not dealing with a value
401 * that can be mapped to a cpu physical address). This is not really specified
402 * that way, but this is traditionally the way IBM at least do things
403 */
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100404u64 __of_translate_address(struct device_node *dev, const __be32 *in_addr,
Grant Likelydbbdee92010-06-08 07:48:10 -0600405 const char *rprop)
406{
407 struct device_node *parent = NULL;
408 struct of_bus *bus, *pbus;
409 u32 addr[OF_MAX_ADDR_CELLS];
410 int na, ns, pna, pns;
411 u64 result = OF_BAD_ADDR;
412
413 pr_debug("OF: ** translation for device %s **\n", dev->full_name);
414
415 /* Increase refcount at current level */
416 of_node_get(dev);
417
418 /* Get parent & match bus type */
419 parent = of_get_parent(dev);
420 if (parent == NULL)
421 goto bail;
422 bus = of_match_bus(parent);
423
424 /* Cound address cells & copy address locally */
425 bus->count_cells(dev, &na, &ns);
426 if (!OF_CHECK_COUNTS(na, ns)) {
427 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
428 dev->full_name);
429 goto bail;
430 }
431 memcpy(addr, in_addr, na * 4);
432
433 pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
434 bus->name, na, ns, parent->full_name);
435 of_dump_addr("OF: translating address:", addr, na);
436
437 /* Translate */
438 for (;;) {
439 /* Switch to parent bus */
440 of_node_put(dev);
441 dev = parent;
442 parent = of_get_parent(dev);
443
444 /* If root, we have finished */
445 if (parent == NULL) {
446 pr_debug("OF: reached root node\n");
447 result = of_read_number(addr, na);
448 break;
449 }
450
451 /* Get new parent bus and counts */
452 pbus = of_match_bus(parent);
453 pbus->count_cells(dev, &pna, &pns);
454 if (!OF_CHECK_COUNTS(pna, pns)) {
455 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
456 dev->full_name);
457 break;
458 }
459
460 pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
461 pbus->name, pna, pns, parent->full_name);
462
463 /* Apply bus translation */
464 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
465 break;
466
467 /* Complete the move up one level */
468 na = pna;
469 ns = pns;
470 bus = pbus;
471
472 of_dump_addr("OF: one level translation:", addr, na);
473 }
474 bail:
475 of_node_put(parent);
476 of_node_put(dev);
477
478 return result;
479}
480
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100481u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600482{
483 return __of_translate_address(dev, in_addr, "ranges");
484}
485EXPORT_SYMBOL(of_translate_address);
486
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100487u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600488{
489 return __of_translate_address(dev, in_addr, "dma-ranges");
490}
491EXPORT_SYMBOL(of_translate_dma_address);
492
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100493const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
Grant Likelydbbdee92010-06-08 07:48:10 -0600494 unsigned int *flags)
495{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100496 const __be32 *prop;
Grant Likelydbbdee92010-06-08 07:48:10 -0600497 unsigned int psize;
498 struct device_node *parent;
499 struct of_bus *bus;
500 int onesize, i, na, ns;
501
502 /* Get parent & match bus type */
503 parent = of_get_parent(dev);
504 if (parent == NULL)
505 return NULL;
506 bus = of_match_bus(parent);
507 bus->count_cells(dev, &na, &ns);
508 of_node_put(parent);
509 if (!OF_CHECK_COUNTS(na, ns))
510 return NULL;
511
512 /* Get "reg" or "assigned-addresses" property */
513 prop = of_get_property(dev, bus->addresses, &psize);
514 if (prop == NULL)
515 return NULL;
516 psize /= 4;
517
518 onesize = na + ns;
519 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
520 if (i == index) {
521 if (size)
522 *size = of_read_number(prop + na, ns);
523 if (flags)
524 *flags = bus->get_flags(prop);
525 return prop;
526 }
527 return NULL;
528}
529EXPORT_SYMBOL(of_get_address);
530
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100531static int __of_address_to_resource(struct device_node *dev,
532 const __be32 *addrp, u64 size, unsigned int flags,
Benoit Cousson35f3da32011-12-05 15:23:55 +0100533 const char *name, struct resource *r)
Grant Likely1f5bef32010-06-08 07:48:09 -0600534{
535 u64 taddr;
536
537 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
538 return -EINVAL;
539 taddr = of_translate_address(dev, addrp);
540 if (taddr == OF_BAD_ADDR)
541 return -EINVAL;
542 memset(r, 0, sizeof(struct resource));
543 if (flags & IORESOURCE_IO) {
544 unsigned long port;
545 port = pci_address_to_pio(taddr);
546 if (port == (unsigned long)-1)
547 return -EINVAL;
548 r->start = port;
549 r->end = port + size - 1;
550 } else {
551 r->start = taddr;
552 r->end = taddr + size - 1;
553 }
554 r->flags = flags;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100555 r->name = name ? name : dev->full_name;
556
Grant Likely1f5bef32010-06-08 07:48:09 -0600557 return 0;
558}
559
560/**
561 * of_address_to_resource - Translate device tree address and return as resource
562 *
563 * Note that if your address is a PIO address, the conversion will fail if
564 * the physical address can't be internally converted to an IO token with
565 * pci_address_to_pio(), that is because it's either called to early or it
566 * can't be matched to any host bridge IO space
567 */
568int of_address_to_resource(struct device_node *dev, int index,
569 struct resource *r)
570{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100571 const __be32 *addrp;
Grant Likely1f5bef32010-06-08 07:48:09 -0600572 u64 size;
573 unsigned int flags;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100574 const char *name = NULL;
Grant Likely1f5bef32010-06-08 07:48:09 -0600575
576 addrp = of_get_address(dev, index, &size, &flags);
577 if (addrp == NULL)
578 return -EINVAL;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100579
580 /* Get optional "reg-names" property to add a name to a resource */
581 of_property_read_string_index(dev, "reg-names", index, &name);
582
583 return __of_address_to_resource(dev, addrp, size, flags, name, r);
Grant Likely1f5bef32010-06-08 07:48:09 -0600584}
585EXPORT_SYMBOL_GPL(of_address_to_resource);
586
Grant Likely90e33f62011-07-05 23:42:28 -0600587struct device_node *of_find_matching_node_by_address(struct device_node *from,
588 const struct of_device_id *matches,
589 u64 base_address)
590{
591 struct device_node *dn = of_find_matching_node(from, matches);
592 struct resource res;
593
594 while (dn) {
595 if (of_address_to_resource(dn, 0, &res))
596 continue;
597 if (res.start == base_address)
598 return dn;
599 dn = of_find_matching_node(dn, matches);
600 }
601
602 return NULL;
603}
604
Grant Likely1f5bef32010-06-08 07:48:09 -0600605
Grant Likely6b884a82010-06-08 07:48:09 -0600606/**
607 * of_iomap - Maps the memory mapped IO for a given device_node
608 * @device: the device whose io range will be mapped
609 * @index: index of the io range
610 *
611 * Returns a pointer to the mapped memory
612 */
613void __iomem *of_iomap(struct device_node *np, int index)
614{
615 struct resource res;
616
617 if (of_address_to_resource(np, index, &res))
618 return NULL;
619
Felipe Balbi28c1b6d2011-07-22 22:47:21 +0300620 return ioremap(res.start, resource_size(&res));
Grant Likely6b884a82010-06-08 07:48:09 -0600621}
622EXPORT_SYMBOL(of_iomap);