blob: d244b2859aac631b17dca4ecc16920e83fdc51a5 [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
72 if (da < cp || da >= (cp + s))
73 return OF_BAD_ADDR;
74 return da - cp;
75}
76
Kim Phillips47b1e682012-10-08 19:41:58 -050077static int of_bus_default_translate(__be32 *addr, u64 offset, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -060078{
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
Gregory CLEMENT25a31572014-02-19 23:14:55 +010094#ifdef CONFIG_OF_ADDRESS_PCI
Grant Likelydbbdee92010-06-08 07:48:10 -060095/*
96 * PCI bus specific translator
97 */
98
99static int of_bus_pci_match(struct device_node *np)
100{
Benjamin Herrenschmidt6dd18e42013-07-03 16:01:10 +1000101 /*
Kleber Sacilotto de Souza14e2abb2014-02-03 13:31:03 -0200102 * "pciex" is PCI Express
Benjamin Herrenschmidt6dd18e42013-07-03 16:01:10 +1000103 * "vci" is for the /chaos bridge on 1st-gen PCI powermacs
104 * "ht" is hypertransport
105 */
Kleber Sacilotto de Souza14e2abb2014-02-03 13:31:03 -0200106 return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex") ||
107 !strcmp(np->type, "vci") || !strcmp(np->type, "ht");
Grant Likelydbbdee92010-06-08 07:48:10 -0600108}
109
110static void of_bus_pci_count_cells(struct device_node *np,
111 int *addrc, int *sizec)
112{
113 if (addrc)
114 *addrc = 3;
115 if (sizec)
116 *sizec = 2;
117}
118
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100119static unsigned int of_bus_pci_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600120{
121 unsigned int flags = 0;
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100122 u32 w = be32_to_cpup(addr);
Grant Likelydbbdee92010-06-08 07:48:10 -0600123
124 switch((w >> 24) & 0x03) {
125 case 0x01:
126 flags |= IORESOURCE_IO;
127 break;
128 case 0x02: /* 32 bits */
129 case 0x03: /* 64 bits */
130 flags |= IORESOURCE_MEM;
131 break;
132 }
133 if (w & 0x40000000)
134 flags |= IORESOURCE_PREFETCH;
135 return flags;
136}
137
Kim Phillips47b1e682012-10-08 19:41:58 -0500138static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100139 int pna)
Grant Likelydbbdee92010-06-08 07:48:10 -0600140{
141 u64 cp, s, da;
142 unsigned int af, rf;
143
144 af = of_bus_pci_get_flags(addr);
145 rf = of_bus_pci_get_flags(range);
146
147 /* Check address type match */
148 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
149 return OF_BAD_ADDR;
150
151 /* Read address values, skipping high cell */
152 cp = of_read_number(range + 1, na - 1);
153 s = of_read_number(range + na + pna, ns);
154 da = of_read_number(addr + 1, na - 1);
155
156 pr_debug("OF: PCI map, cp=%llx, s=%llx, da=%llx\n",
157 (unsigned long long)cp, (unsigned long long)s,
158 (unsigned long long)da);
159
160 if (da < cp || da >= (cp + s))
161 return OF_BAD_ADDR;
162 return da - cp;
163}
164
Kim Phillips47b1e682012-10-08 19:41:58 -0500165static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -0600166{
167 return of_bus_default_translate(addr + 1, offset, na - 1);
168}
Gregory CLEMENT25a31572014-02-19 23:14:55 +0100169#endif /* CONFIG_OF_ADDRESS_PCI */
Grant Likelydbbdee92010-06-08 07:48:10 -0600170
Gregory CLEMENT25a31572014-02-19 23:14:55 +0100171#ifdef CONFIG_PCI
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100172const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
Grant Likelydbbdee92010-06-08 07:48:10 -0600173 unsigned int *flags)
174{
Jeremy Kerra9fadee2010-10-10 21:24:10 -0600175 const __be32 *prop;
Grant Likelydbbdee92010-06-08 07:48:10 -0600176 unsigned int psize;
177 struct device_node *parent;
178 struct of_bus *bus;
179 int onesize, i, na, ns;
180
181 /* Get parent & match bus type */
182 parent = of_get_parent(dev);
183 if (parent == NULL)
184 return NULL;
185 bus = of_match_bus(parent);
186 if (strcmp(bus->name, "pci")) {
187 of_node_put(parent);
188 return NULL;
189 }
190 bus->count_cells(dev, &na, &ns);
191 of_node_put(parent);
Stephen Warren5d61b162012-07-25 17:34:37 -0600192 if (!OF_CHECK_ADDR_COUNT(na))
Grant Likelydbbdee92010-06-08 07:48:10 -0600193 return NULL;
194
195 /* Get "reg" or "assigned-addresses" property */
196 prop = of_get_property(dev, bus->addresses, &psize);
197 if (prop == NULL)
198 return NULL;
199 psize /= 4;
200
201 onesize = na + ns;
Grant Likely154063a92010-06-08 07:48:11 -0600202 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) {
203 u32 val = be32_to_cpu(prop[0]);
204 if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
Grant Likelydbbdee92010-06-08 07:48:10 -0600205 if (size)
206 *size = of_read_number(prop + na, ns);
207 if (flags)
208 *flags = bus->get_flags(prop);
209 return prop;
210 }
Grant Likely154063a92010-06-08 07:48:11 -0600211 }
Grant Likelydbbdee92010-06-08 07:48:10 -0600212 return NULL;
213}
214EXPORT_SYMBOL(of_get_pci_address);
215
216int of_pci_address_to_resource(struct device_node *dev, int bar,
217 struct resource *r)
218{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100219 const __be32 *addrp;
Grant Likelydbbdee92010-06-08 07:48:10 -0600220 u64 size;
221 unsigned int flags;
222
223 addrp = of_get_pci_address(dev, bar, &size, &flags);
224 if (addrp == NULL)
225 return -EINVAL;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100226 return __of_address_to_resource(dev, addrp, size, flags, NULL, r);
Grant Likelydbbdee92010-06-08 07:48:10 -0600227}
228EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
Andrew Murray29b635c2013-05-16 17:55:17 +0200229
230int of_pci_range_parser_init(struct of_pci_range_parser *parser,
231 struct device_node *node)
232{
233 const int na = 3, ns = 2;
234 int rlen;
235
236 parser->node = node;
237 parser->pna = of_n_addr_cells(node);
238 parser->np = parser->pna + na + ns;
239
240 parser->range = of_get_property(node, "ranges", &rlen);
241 if (parser->range == NULL)
242 return -ENOENT;
243
244 parser->end = parser->range + rlen / sizeof(__be32);
245
246 return 0;
247}
248EXPORT_SYMBOL_GPL(of_pci_range_parser_init);
249
250struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
251 struct of_pci_range *range)
252{
253 const int na = 3, ns = 2;
254
255 if (!range)
256 return NULL;
257
258 if (!parser->range || parser->range + parser->np > parser->end)
259 return NULL;
260
261 range->pci_space = parser->range[0];
262 range->flags = of_bus_pci_get_flags(parser->range);
263 range->pci_addr = of_read_number(parser->range + 1, ns);
264 range->cpu_addr = of_translate_address(parser->node,
265 parser->range + na);
266 range->size = of_read_number(parser->range + parser->pna + na, ns);
267
268 parser->range += parser->np;
269
270 /* Now consume following elements while they are contiguous */
271 while (parser->range + parser->np <= parser->end) {
272 u32 flags, pci_space;
273 u64 pci_addr, cpu_addr, size;
274
275 pci_space = be32_to_cpup(parser->range);
276 flags = of_bus_pci_get_flags(parser->range);
277 pci_addr = of_read_number(parser->range + 1, ns);
278 cpu_addr = of_translate_address(parser->node,
279 parser->range + na);
280 size = of_read_number(parser->range + parser->pna + na, ns);
281
282 if (flags != range->flags)
283 break;
284 if (pci_addr != range->pci_addr + range->size ||
285 cpu_addr != range->cpu_addr + range->size)
286 break;
287
288 range->size += size;
289 parser->range += parser->np;
290 }
291
292 return range;
293}
294EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
295
Grant Likelydbbdee92010-06-08 07:48:10 -0600296#endif /* CONFIG_PCI */
297
298/*
299 * ISA bus specific translator
300 */
301
302static int of_bus_isa_match(struct device_node *np)
303{
304 return !strcmp(np->name, "isa");
305}
306
307static void of_bus_isa_count_cells(struct device_node *child,
308 int *addrc, int *sizec)
309{
310 if (addrc)
311 *addrc = 2;
312 if (sizec)
313 *sizec = 1;
314}
315
Kim Phillips47b1e682012-10-08 19:41:58 -0500316static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns,
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100317 int pna)
Grant Likelydbbdee92010-06-08 07:48:10 -0600318{
319 u64 cp, s, da;
320
321 /* Check address type match */
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100322 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
Grant Likelydbbdee92010-06-08 07:48:10 -0600323 return OF_BAD_ADDR;
324
325 /* Read address values, skipping high cell */
326 cp = of_read_number(range + 1, na - 1);
327 s = of_read_number(range + na + pna, ns);
328 da = of_read_number(addr + 1, na - 1);
329
330 pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n",
331 (unsigned long long)cp, (unsigned long long)s,
332 (unsigned long long)da);
333
334 if (da < cp || da >= (cp + s))
335 return OF_BAD_ADDR;
336 return da - cp;
337}
338
Kim Phillips47b1e682012-10-08 19:41:58 -0500339static int of_bus_isa_translate(__be32 *addr, u64 offset, int na)
Grant Likelydbbdee92010-06-08 07:48:10 -0600340{
341 return of_bus_default_translate(addr + 1, offset, na - 1);
342}
343
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100344static unsigned int of_bus_isa_get_flags(const __be32 *addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600345{
346 unsigned int flags = 0;
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100347 u32 w = be32_to_cpup(addr);
Grant Likelydbbdee92010-06-08 07:48:10 -0600348
349 if (w & 1)
350 flags |= IORESOURCE_IO;
351 else
352 flags |= IORESOURCE_MEM;
353 return flags;
354}
355
356/*
357 * Array of bus specific translators
358 */
359
360static struct of_bus of_busses[] = {
Gregory CLEMENT25a31572014-02-19 23:14:55 +0100361#ifdef CONFIG_OF_ADDRESS_PCI
Grant Likelydbbdee92010-06-08 07:48:10 -0600362 /* PCI */
363 {
364 .name = "pci",
365 .addresses = "assigned-addresses",
366 .match = of_bus_pci_match,
367 .count_cells = of_bus_pci_count_cells,
368 .map = of_bus_pci_map,
369 .translate = of_bus_pci_translate,
370 .get_flags = of_bus_pci_get_flags,
371 },
Gregory CLEMENT25a31572014-02-19 23:14:55 +0100372#endif /* CONFIG_OF_ADDRESS_PCI */
Grant Likelydbbdee92010-06-08 07:48:10 -0600373 /* ISA */
374 {
375 .name = "isa",
376 .addresses = "reg",
377 .match = of_bus_isa_match,
378 .count_cells = of_bus_isa_count_cells,
379 .map = of_bus_isa_map,
380 .translate = of_bus_isa_translate,
381 .get_flags = of_bus_isa_get_flags,
382 },
383 /* Default */
384 {
385 .name = "default",
386 .addresses = "reg",
387 .match = NULL,
388 .count_cells = of_bus_default_count_cells,
389 .map = of_bus_default_map,
390 .translate = of_bus_default_translate,
391 .get_flags = of_bus_default_get_flags,
392 },
393};
394
395static struct of_bus *of_match_bus(struct device_node *np)
396{
397 int i;
398
399 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
400 if (!of_busses[i].match || of_busses[i].match(np))
401 return &of_busses[i];
402 BUG();
403 return NULL;
404}
405
406static int of_translate_one(struct device_node *parent, struct of_bus *bus,
Kim Phillips47b1e682012-10-08 19:41:58 -0500407 struct of_bus *pbus, __be32 *addr,
Grant Likelydbbdee92010-06-08 07:48:10 -0600408 int na, int ns, int pna, const char *rprop)
409{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100410 const __be32 *ranges;
Grant Likelydbbdee92010-06-08 07:48:10 -0600411 unsigned int rlen;
412 int rone;
413 u64 offset = OF_BAD_ADDR;
414
415 /* Normally, an absence of a "ranges" property means we are
416 * crossing a non-translatable boundary, and thus the addresses
417 * below the current not cannot be converted to CPU physical ones.
418 * Unfortunately, while this is very clear in the spec, it's not
419 * what Apple understood, and they do have things like /uni-n or
420 * /ht nodes with no "ranges" property and a lot of perfectly
421 * useable mapped devices below them. Thus we treat the absence of
422 * "ranges" as equivalent to an empty "ranges" property which means
423 * a 1:1 translation at that level. It's up to the caller not to try
424 * to translate addresses that aren't supposed to be translated in
425 * the first place. --BenH.
Grant Likely3930f292010-06-08 07:48:11 -0600426 *
427 * As far as we know, this damage only exists on Apple machines, so
428 * This code is only enabled on powerpc. --gcl
Grant Likelydbbdee92010-06-08 07:48:10 -0600429 */
430 ranges = of_get_property(parent, rprop, &rlen);
Grant Likely3930f292010-06-08 07:48:11 -0600431#if !defined(CONFIG_PPC)
432 if (ranges == NULL) {
433 pr_err("OF: no ranges; cannot translate\n");
434 return 1;
435 }
436#endif /* !defined(CONFIG_PPC) */
Grant Likelydbbdee92010-06-08 07:48:10 -0600437 if (ranges == NULL || rlen == 0) {
438 offset = of_read_number(addr, na);
439 memset(addr, 0, pna * 4);
Grant Likely3930f292010-06-08 07:48:11 -0600440 pr_debug("OF: empty ranges; 1:1 translation\n");
Grant Likelydbbdee92010-06-08 07:48:10 -0600441 goto finish;
442 }
443
444 pr_debug("OF: walking ranges...\n");
445
446 /* Now walk through the ranges */
447 rlen /= 4;
448 rone = na + pna + ns;
449 for (; rlen >= rone; rlen -= rone, ranges += rone) {
450 offset = bus->map(addr, ranges, na, ns, pna);
451 if (offset != OF_BAD_ADDR)
452 break;
453 }
454 if (offset == OF_BAD_ADDR) {
455 pr_debug("OF: not found !\n");
456 return 1;
457 }
458 memcpy(addr, ranges + na, 4 * pna);
459
460 finish:
461 of_dump_addr("OF: parent translation for:", addr, pna);
462 pr_debug("OF: with offset: %llx\n", (unsigned long long)offset);
463
464 /* Translate it into parent bus space */
465 return pbus->translate(addr, offset, pna);
466}
467
468/*
469 * Translate an address from the device-tree into a CPU physical address,
470 * this walks up the tree and applies the various bus mappings on the
471 * way.
472 *
473 * Note: We consider that crossing any level with #size-cells == 0 to mean
474 * that translation is impossible (that is we are not dealing with a value
475 * that can be mapped to a cpu physical address). This is not really specified
476 * that way, but this is traditionally the way IBM at least do things
477 */
Kim Phillips47b1e682012-10-08 19:41:58 -0500478static u64 __of_translate_address(struct device_node *dev,
479 const __be32 *in_addr, const char *rprop)
Grant Likelydbbdee92010-06-08 07:48:10 -0600480{
481 struct device_node *parent = NULL;
482 struct of_bus *bus, *pbus;
Kim Phillips47b1e682012-10-08 19:41:58 -0500483 __be32 addr[OF_MAX_ADDR_CELLS];
Grant Likelydbbdee92010-06-08 07:48:10 -0600484 int na, ns, pna, pns;
485 u64 result = OF_BAD_ADDR;
486
Grant Likely88048272013-09-19 11:01:52 -0500487 pr_debug("OF: ** translation for device %s **\n", of_node_full_name(dev));
Grant Likelydbbdee92010-06-08 07:48:10 -0600488
489 /* Increase refcount at current level */
490 of_node_get(dev);
491
492 /* Get parent & match bus type */
493 parent = of_get_parent(dev);
494 if (parent == NULL)
495 goto bail;
496 bus = of_match_bus(parent);
497
Andrew Murray59f5ca42012-12-13 10:11:23 +0000498 /* Count address cells & copy address locally */
Grant Likelydbbdee92010-06-08 07:48:10 -0600499 bus->count_cells(dev, &na, &ns);
500 if (!OF_CHECK_COUNTS(na, ns)) {
501 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
Grant Likely88048272013-09-19 11:01:52 -0500502 of_node_full_name(dev));
Grant Likelydbbdee92010-06-08 07:48:10 -0600503 goto bail;
504 }
505 memcpy(addr, in_addr, na * 4);
506
507 pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
Grant Likely88048272013-09-19 11:01:52 -0500508 bus->name, na, ns, of_node_full_name(parent));
Grant Likelydbbdee92010-06-08 07:48:10 -0600509 of_dump_addr("OF: translating address:", addr, na);
510
511 /* Translate */
512 for (;;) {
513 /* Switch to parent bus */
514 of_node_put(dev);
515 dev = parent;
516 parent = of_get_parent(dev);
517
518 /* If root, we have finished */
519 if (parent == NULL) {
520 pr_debug("OF: reached root node\n");
521 result = of_read_number(addr, na);
522 break;
523 }
524
525 /* Get new parent bus and counts */
526 pbus = of_match_bus(parent);
527 pbus->count_cells(dev, &pna, &pns);
528 if (!OF_CHECK_COUNTS(pna, pns)) {
529 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
Grant Likely0c02c802013-09-19 11:22:36 -0500530 of_node_full_name(dev));
Grant Likelydbbdee92010-06-08 07:48:10 -0600531 break;
532 }
533
534 pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
Grant Likely0c02c802013-09-19 11:22:36 -0500535 pbus->name, pna, pns, of_node_full_name(parent));
Grant Likelydbbdee92010-06-08 07:48:10 -0600536
537 /* Apply bus translation */
538 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
539 break;
540
541 /* Complete the move up one level */
542 na = pna;
543 ns = pns;
544 bus = pbus;
545
546 of_dump_addr("OF: one level translation:", addr, na);
547 }
548 bail:
549 of_node_put(parent);
550 of_node_put(dev);
551
552 return result;
553}
554
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100555u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600556{
557 return __of_translate_address(dev, in_addr, "ranges");
558}
559EXPORT_SYMBOL(of_translate_address);
560
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100561u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
Grant Likelydbbdee92010-06-08 07:48:10 -0600562{
563 return __of_translate_address(dev, in_addr, "dma-ranges");
564}
565EXPORT_SYMBOL(of_translate_dma_address);
566
Stephen Warren5d61b162012-07-25 17:34:37 -0600567bool of_can_translate_address(struct device_node *dev)
568{
569 struct device_node *parent;
570 struct of_bus *bus;
571 int na, ns;
572
573 parent = of_get_parent(dev);
574 if (parent == NULL)
575 return false;
576
577 bus = of_match_bus(parent);
578 bus->count_cells(dev, &na, &ns);
579
580 of_node_put(parent);
581
582 return OF_CHECK_COUNTS(na, ns);
583}
584EXPORT_SYMBOL(of_can_translate_address);
585
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100586const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
Grant Likelydbbdee92010-06-08 07:48:10 -0600587 unsigned int *flags)
588{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100589 const __be32 *prop;
Grant Likelydbbdee92010-06-08 07:48:10 -0600590 unsigned int psize;
591 struct device_node *parent;
592 struct of_bus *bus;
593 int onesize, i, na, ns;
594
595 /* Get parent & match bus type */
596 parent = of_get_parent(dev);
597 if (parent == NULL)
598 return NULL;
599 bus = of_match_bus(parent);
600 bus->count_cells(dev, &na, &ns);
601 of_node_put(parent);
Stephen Warren5d61b162012-07-25 17:34:37 -0600602 if (!OF_CHECK_ADDR_COUNT(na))
Grant Likelydbbdee92010-06-08 07:48:10 -0600603 return NULL;
604
605 /* Get "reg" or "assigned-addresses" property */
606 prop = of_get_property(dev, bus->addresses, &psize);
607 if (prop == NULL)
608 return NULL;
609 psize /= 4;
610
611 onesize = na + ns;
612 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
613 if (i == index) {
614 if (size)
615 *size = of_read_number(prop + na, ns);
616 if (flags)
617 *flags = bus->get_flags(prop);
618 return prop;
619 }
620 return NULL;
621}
622EXPORT_SYMBOL(of_get_address);
623
Rob Herring25ff7942013-09-07 14:07:11 -0500624unsigned long __weak pci_address_to_pio(phys_addr_t address)
625{
626 if (address > IO_SPACE_LIMIT)
627 return (unsigned long)-1;
628
629 return (unsigned long) address;
630}
631
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100632static int __of_address_to_resource(struct device_node *dev,
633 const __be32 *addrp, u64 size, unsigned int flags,
Benoit Cousson35f3da32011-12-05 15:23:55 +0100634 const char *name, struct resource *r)
Grant Likely1f5bef32010-06-08 07:48:09 -0600635{
636 u64 taddr;
637
638 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
639 return -EINVAL;
640 taddr = of_translate_address(dev, addrp);
641 if (taddr == OF_BAD_ADDR)
642 return -EINVAL;
643 memset(r, 0, sizeof(struct resource));
644 if (flags & IORESOURCE_IO) {
645 unsigned long port;
646 port = pci_address_to_pio(taddr);
647 if (port == (unsigned long)-1)
648 return -EINVAL;
649 r->start = port;
650 r->end = port + size - 1;
651 } else {
652 r->start = taddr;
653 r->end = taddr + size - 1;
654 }
655 r->flags = flags;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100656 r->name = name ? name : dev->full_name;
657
Grant Likely1f5bef32010-06-08 07:48:09 -0600658 return 0;
659}
660
661/**
662 * of_address_to_resource - Translate device tree address and return as resource
663 *
664 * Note that if your address is a PIO address, the conversion will fail if
665 * the physical address can't be internally converted to an IO token with
666 * pci_address_to_pio(), that is because it's either called to early or it
667 * can't be matched to any host bridge IO space
668 */
669int of_address_to_resource(struct device_node *dev, int index,
670 struct resource *r)
671{
Sebastian Andrzej Siewior0131d892010-12-01 10:54:46 +0100672 const __be32 *addrp;
Grant Likely1f5bef32010-06-08 07:48:09 -0600673 u64 size;
674 unsigned int flags;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100675 const char *name = NULL;
Grant Likely1f5bef32010-06-08 07:48:09 -0600676
677 addrp = of_get_address(dev, index, &size, &flags);
678 if (addrp == NULL)
679 return -EINVAL;
Benoit Cousson35f3da32011-12-05 15:23:55 +0100680
681 /* Get optional "reg-names" property to add a name to a resource */
682 of_property_read_string_index(dev, "reg-names", index, &name);
683
684 return __of_address_to_resource(dev, addrp, size, flags, name, r);
Grant Likely1f5bef32010-06-08 07:48:09 -0600685}
686EXPORT_SYMBOL_GPL(of_address_to_resource);
687
Grant Likely90e33f62011-07-05 23:42:28 -0600688struct device_node *of_find_matching_node_by_address(struct device_node *from,
689 const struct of_device_id *matches,
690 u64 base_address)
691{
692 struct device_node *dn = of_find_matching_node(from, matches);
693 struct resource res;
694
695 while (dn) {
696 if (of_address_to_resource(dn, 0, &res))
697 continue;
698 if (res.start == base_address)
699 return dn;
700 dn = of_find_matching_node(dn, matches);
701 }
702
703 return NULL;
704}
705
Grant Likely1f5bef32010-06-08 07:48:09 -0600706
Grant Likely6b884a82010-06-08 07:48:09 -0600707/**
708 * of_iomap - Maps the memory mapped IO for a given device_node
709 * @device: the device whose io range will be mapped
710 * @index: index of the io range
711 *
712 * Returns a pointer to the mapped memory
713 */
714void __iomem *of_iomap(struct device_node *np, int index)
715{
716 struct resource res;
717
718 if (of_address_to_resource(np, index, &res))
719 return NULL;
720
Felipe Balbi28c1b6d2011-07-22 22:47:21 +0300721 return ioremap(res.start, resource_size(&res));
Grant Likely6b884a82010-06-08 07:48:09 -0600722}
723EXPORT_SYMBOL(of_iomap);
Grygorii Strashko18308c92014-04-24 11:30:02 -0400724
725/**
726 * of_dma_get_range - Get DMA range info
727 * @np: device node to get DMA range info
728 * @dma_addr: pointer to store initial DMA address of DMA range
729 * @paddr: pointer to store initial CPU address of DMA range
730 * @size: pointer to store size of DMA range
731 *
732 * Look in bottom up direction for the first "dma-ranges" property
733 * and parse it.
734 * dma-ranges format:
735 * DMA addr (dma_addr) : naddr cells
736 * CPU addr (phys_addr_t) : pna cells
737 * size : nsize cells
738 *
739 * It returns -ENODEV if "dma-ranges" property was not found
740 * for this device in DT.
741 */
742int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size)
743{
744 struct device_node *node = of_node_get(np);
745 const __be32 *ranges = NULL;
746 int len, naddr, nsize, pna;
747 int ret = 0;
748 u64 dmaaddr;
749
750 if (!node)
751 return -EINVAL;
752
753 while (1) {
754 naddr = of_n_addr_cells(node);
755 nsize = of_n_size_cells(node);
756 node = of_get_next_parent(node);
757 if (!node)
758 break;
759
760 ranges = of_get_property(node, "dma-ranges", &len);
761
762 /* Ignore empty ranges, they imply no translation required */
763 if (ranges && len > 0)
764 break;
765
766 /*
767 * At least empty ranges has to be defined for parent node if
768 * DMA is supported
769 */
770 if (!ranges)
771 break;
772 }
773
774 if (!ranges) {
775 pr_debug("%s: no dma-ranges found for node(%s)\n",
776 __func__, np->full_name);
777 ret = -ENODEV;
778 goto out;
779 }
780
781 len /= sizeof(u32);
782
783 pna = of_n_addr_cells(node);
784
785 /* dma-ranges format:
786 * DMA addr : naddr cells
787 * CPU addr : pna cells
788 * size : nsize cells
789 */
790 dmaaddr = of_read_number(ranges, naddr);
791 *paddr = of_translate_dma_address(np, ranges);
792 if (*paddr == OF_BAD_ADDR) {
793 pr_err("%s: translation of DMA address(%pad) to CPU address failed node(%s)\n",
794 __func__, dma_addr, np->full_name);
795 ret = -EINVAL;
796 goto out;
797 }
798 *dma_addr = dmaaddr;
799
800 *size = of_read_number(ranges + naddr + pna, nsize);
801
802 pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n",
803 *dma_addr, *paddr, *size);
804
805out:
806 of_node_put(node);
807
808 return ret;
809}
810EXPORT_SYMBOL_GPL(of_dma_get_range);
Santosh Shilimkar92ea6372014-04-24 11:30:03 -0400811
812/**
813 * of_dma_is_coherent - Check if device is coherent
814 * @np: device node
815 *
816 * It returns true if "dma-coherent" property was found
817 * for this device in DT.
818 */
819bool of_dma_is_coherent(struct device_node *np)
820{
821 struct device_node *node = of_node_get(np);
822
823 while (node) {
824 if (of_property_read_bool(node, "dma-coherent")) {
825 of_node_put(node);
826 return true;
827 }
828 node = of_get_next_parent(node);
829 }
830 of_node_put(node);
831 return false;
832}
833EXPORT_SYMBOL_GPL(of_dma_is_coherent);