Commit | Line | Data |
---|---|---|
6b884a8d | 1 | |
606ad42a RH |
2 | #define pr_fmt(fmt) "OF: " fmt |
3 | ||
5019f0b1 | 4 | #include <linux/device.h> |
6b884a8d GL |
5 | #include <linux/io.h> |
6 | #include <linux/ioport.h> | |
dbbdee94 | 7 | #include <linux/module.h> |
6b884a8d | 8 | #include <linux/of_address.h> |
c5076cfe | 9 | #include <linux/pci.h> |
dbbdee94 | 10 | #include <linux/pci_regs.h> |
41f8bba7 LD |
11 | #include <linux/sizes.h> |
12 | #include <linux/slab.h> | |
dbbdee94 | 13 | #include <linux/string.h> |
6b884a8d | 14 | |
dbbdee94 GL |
15 | /* Max address size we deal with */ |
16 | #define OF_MAX_ADDR_CELLS 4 | |
5d61b165 SW |
17 | #define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS) |
18 | #define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0) | |
dbbdee94 GL |
19 | |
20 | static struct of_bus *of_match_bus(struct device_node *np); | |
0131d897 SAS |
21 | static int __of_address_to_resource(struct device_node *dev, |
22 | const __be32 *addrp, u64 size, unsigned int flags, | |
35f3da32 | 23 | const char *name, struct resource *r); |
dbbdee94 GL |
24 | |
25 | /* Debug utility */ | |
26 | #ifdef DEBUG | |
0131d897 | 27 | static void of_dump_addr(const char *s, const __be32 *addr, int na) |
dbbdee94 | 28 | { |
606ad42a | 29 | pr_debug("%s", s); |
dbbdee94 | 30 | while (na--) |
606ad42a RH |
31 | pr_cont(" %08x", be32_to_cpu(*(addr++))); |
32 | pr_cont("\n"); | |
dbbdee94 GL |
33 | } |
34 | #else | |
0131d897 | 35 | static void of_dump_addr(const char *s, const __be32 *addr, int na) { } |
dbbdee94 GL |
36 | #endif |
37 | ||
38 | /* Callbacks for bus specific translators */ | |
39 | struct of_bus { | |
40 | const char *name; | |
41 | const char *addresses; | |
42 | int (*match)(struct device_node *parent); | |
43 | void (*count_cells)(struct device_node *child, | |
44 | int *addrc, int *sizec); | |
47b1e689 | 45 | u64 (*map)(__be32 *addr, const __be32 *range, |
dbbdee94 | 46 | int na, int ns, int pna); |
47b1e689 | 47 | int (*translate)(__be32 *addr, u64 offset, int na); |
0131d897 | 48 | unsigned int (*get_flags)(const __be32 *addr); |
dbbdee94 GL |
49 | }; |
50 | ||
51 | /* | |
52 | * Default translator (generic bus) | |
53 | */ | |
54 | ||
55 | static void of_bus_default_count_cells(struct device_node *dev, | |
56 | int *addrc, int *sizec) | |
57 | { | |
58 | if (addrc) | |
59 | *addrc = of_n_addr_cells(dev); | |
60 | if (sizec) | |
61 | *sizec = of_n_size_cells(dev); | |
62 | } | |
63 | ||
47b1e689 | 64 | static u64 of_bus_default_map(__be32 *addr, const __be32 *range, |
dbbdee94 GL |
65 | int na, int ns, int pna) |
66 | { | |
67 | u64 cp, s, da; | |
68 | ||
69 | cp = of_read_number(range, na); | |
70 | s = of_read_number(range + na + pna, ns); | |
71 | da = of_read_number(addr, na); | |
72 | ||
606ad42a | 73 | pr_debug("default map, cp=%llx, s=%llx, da=%llx\n", |
dbbdee94 GL |
74 | (unsigned long long)cp, (unsigned long long)s, |
75 | (unsigned long long)da); | |
76 | ||
77 | if (da < cp || da >= (cp + s)) | |
78 | return OF_BAD_ADDR; | |
79 | return da - cp; | |
80 | } | |
81 | ||
47b1e689 | 82 | static int of_bus_default_translate(__be32 *addr, u64 offset, int na) |
dbbdee94 GL |
83 | { |
84 | u64 a = of_read_number(addr, na); | |
85 | memset(addr, 0, na * 4); | |
86 | a += offset; | |
87 | if (na > 1) | |
154063a9 GL |
88 | addr[na - 2] = cpu_to_be32(a >> 32); |
89 | addr[na - 1] = cpu_to_be32(a & 0xffffffffu); | |
dbbdee94 GL |
90 | |
91 | return 0; | |
92 | } | |
93 | ||
0131d897 | 94 | static unsigned int of_bus_default_get_flags(const __be32 *addr) |
dbbdee94 GL |
95 | { |
96 | return IORESOURCE_MEM; | |
97 | } | |
98 | ||
25a31579 | 99 | #ifdef CONFIG_OF_ADDRESS_PCI |
dbbdee94 GL |
100 | /* |
101 | * PCI bus specific translator | |
102 | */ | |
103 | ||
104 | static int of_bus_pci_match(struct device_node *np) | |
105 | { | |
6dd18e46 | 106 | /* |
14e2abb7 | 107 | * "pciex" is PCI Express |
6dd18e46 BH |
108 | * "vci" is for the /chaos bridge on 1st-gen PCI powermacs |
109 | * "ht" is hypertransport | |
110 | */ | |
14e2abb7 KSS |
111 | return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex") || |
112 | !strcmp(np->type, "vci") || !strcmp(np->type, "ht"); | |
dbbdee94 GL |
113 | } |
114 | ||
115 | static void of_bus_pci_count_cells(struct device_node *np, | |
116 | int *addrc, int *sizec) | |
117 | { | |
118 | if (addrc) | |
119 | *addrc = 3; | |
120 | if (sizec) | |
121 | *sizec = 2; | |
122 | } | |
123 | ||
0131d897 | 124 | static unsigned int of_bus_pci_get_flags(const __be32 *addr) |
dbbdee94 GL |
125 | { |
126 | unsigned int flags = 0; | |
0131d897 | 127 | u32 w = be32_to_cpup(addr); |
dbbdee94 GL |
128 | |
129 | switch((w >> 24) & 0x03) { | |
130 | case 0x01: | |
131 | flags |= IORESOURCE_IO; | |
132 | break; | |
133 | case 0x02: /* 32 bits */ | |
134 | case 0x03: /* 64 bits */ | |
135 | flags |= IORESOURCE_MEM; | |
136 | break; | |
137 | } | |
138 | if (w & 0x40000000) | |
139 | flags |= IORESOURCE_PREFETCH; | |
140 | return flags; | |
141 | } | |
142 | ||
47b1e689 | 143 | static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns, |
0131d897 | 144 | int pna) |
dbbdee94 GL |
145 | { |
146 | u64 cp, s, da; | |
147 | unsigned int af, rf; | |
148 | ||
149 | af = of_bus_pci_get_flags(addr); | |
150 | rf = of_bus_pci_get_flags(range); | |
151 | ||
152 | /* Check address type match */ | |
153 | if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO)) | |
154 | return OF_BAD_ADDR; | |
155 | ||
156 | /* Read address values, skipping high cell */ | |
157 | cp = of_read_number(range + 1, na - 1); | |
158 | s = of_read_number(range + na + pna, ns); | |
159 | da = of_read_number(addr + 1, na - 1); | |
160 | ||
606ad42a | 161 | pr_debug("PCI map, cp=%llx, s=%llx, da=%llx\n", |
dbbdee94 GL |
162 | (unsigned long long)cp, (unsigned long long)s, |
163 | (unsigned long long)da); | |
164 | ||
165 | if (da < cp || da >= (cp + s)) | |
166 | return OF_BAD_ADDR; | |
167 | return da - cp; | |
168 | } | |
169 | ||
47b1e689 | 170 | static int of_bus_pci_translate(__be32 *addr, u64 offset, int na) |
dbbdee94 GL |
171 | { |
172 | return of_bus_default_translate(addr + 1, offset, na - 1); | |
173 | } | |
25a31579 | 174 | #endif /* CONFIG_OF_ADDRESS_PCI */ |
dbbdee94 | 175 | |
25a31579 | 176 | #ifdef CONFIG_PCI |
0131d897 | 177 | const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size, |
dbbdee94 GL |
178 | unsigned int *flags) |
179 | { | |
a9fadeef | 180 | const __be32 *prop; |
dbbdee94 GL |
181 | 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); | |
5d61b165 | 197 | if (!OF_CHECK_ADDR_COUNT(na)) |
dbbdee94 GL |
198 | 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; | |
154063a9 GL |
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)) { | |
dbbdee94 GL |
210 | if (size) |
211 | *size = of_read_number(prop + na, ns); | |
212 | if (flags) | |
213 | *flags = bus->get_flags(prop); | |
214 | return prop; | |
215 | } | |
154063a9 | 216 | } |
dbbdee94 GL |
217 | return NULL; |
218 | } | |
219 | EXPORT_SYMBOL(of_get_pci_address); | |
220 | ||
221 | int of_pci_address_to_resource(struct device_node *dev, int bar, | |
222 | struct resource *r) | |
223 | { | |
0131d897 | 224 | const __be32 *addrp; |
dbbdee94 GL |
225 | u64 size; |
226 | unsigned int flags; | |
227 | ||
228 | addrp = of_get_pci_address(dev, bar, &size, &flags); | |
229 | if (addrp == NULL) | |
230 | return -EINVAL; | |
35f3da32 | 231 | return __of_address_to_resource(dev, addrp, size, flags, NULL, r); |
dbbdee94 GL |
232 | } |
233 | EXPORT_SYMBOL_GPL(of_pci_address_to_resource); | |
29b635c0 AM |
234 | |
235 | int 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 | } | |
253 | EXPORT_SYMBOL_GPL(of_pci_range_parser_init); | |
254 | ||
255 | struct 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 | ||
eb310036 | 266 | range->pci_space = be32_to_cpup(parser->range); |
29b635c0 AM |
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) { | |
fda9f5d4 | 277 | u32 flags; |
29b635c0 AM |
278 | u64 pci_addr, cpu_addr, size; |
279 | ||
29b635c0 AM |
280 | flags = of_bus_pci_get_flags(parser->range); |
281 | pci_addr = of_read_number(parser->range + 1, ns); | |
282 | cpu_addr = of_translate_address(parser->node, | |
283 | parser->range + na); | |
284 | size = of_read_number(parser->range + parser->pna + na, ns); | |
285 | ||
286 | if (flags != range->flags) | |
287 | break; | |
288 | if (pci_addr != range->pci_addr + range->size || | |
289 | cpu_addr != range->cpu_addr + range->size) | |
290 | break; | |
291 | ||
292 | range->size += size; | |
293 | parser->range += parser->np; | |
294 | } | |
295 | ||
296 | return range; | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(of_pci_range_parser_one); | |
299 | ||
0b0b0893 LD |
300 | /* |
301 | * of_pci_range_to_resource - Create a resource from an of_pci_range | |
302 | * @range: the PCI range that describes the resource | |
303 | * @np: device node where the range belongs to | |
304 | * @res: pointer to a valid resource that will be updated to | |
305 | * reflect the values contained in the range. | |
306 | * | |
307 | * Returns EINVAL if the range cannot be converted to resource. | |
308 | * | |
309 | * Note that if the range is an IO range, the resource will be converted | |
310 | * using pci_address_to_pio() which can fail if it is called too early or | |
311 | * if the range cannot be matched to any host bridge IO space (our case here). | |
312 | * To guard against that we try to register the IO range first. | |
313 | * If that fails we know that pci_address_to_pio() will do too. | |
314 | */ | |
315 | int of_pci_range_to_resource(struct of_pci_range *range, | |
316 | struct device_node *np, struct resource *res) | |
83bbde1c | 317 | { |
0b0b0893 | 318 | int err; |
83bbde1c | 319 | res->flags = range->flags; |
83bbde1c LD |
320 | res->parent = res->child = res->sibling = NULL; |
321 | res->name = np->full_name; | |
0b0b0893 LD |
322 | |
323 | if (res->flags & IORESOURCE_IO) { | |
324 | unsigned long port; | |
325 | err = pci_register_io_range(range->cpu_addr, range->size); | |
326 | if (err) | |
327 | goto invalid_range; | |
328 | port = pci_address_to_pio(range->cpu_addr); | |
329 | if (port == (unsigned long)-1) { | |
330 | err = -EINVAL; | |
331 | goto invalid_range; | |
332 | } | |
333 | res->start = port; | |
334 | } else { | |
4af97106 PF |
335 | if ((sizeof(resource_size_t) < 8) && |
336 | upper_32_bits(range->cpu_addr)) { | |
337 | err = -EINVAL; | |
338 | goto invalid_range; | |
339 | } | |
340 | ||
0b0b0893 LD |
341 | res->start = range->cpu_addr; |
342 | } | |
343 | res->end = res->start + range->size - 1; | |
344 | return 0; | |
345 | ||
346 | invalid_range: | |
347 | res->start = (resource_size_t)OF_BAD_ADDR; | |
348 | res->end = (resource_size_t)OF_BAD_ADDR; | |
349 | return err; | |
83bbde1c | 350 | } |
dbbdee94 GL |
351 | #endif /* CONFIG_PCI */ |
352 | ||
353 | /* | |
354 | * ISA bus specific translator | |
355 | */ | |
356 | ||
357 | static int of_bus_isa_match(struct device_node *np) | |
358 | { | |
359 | return !strcmp(np->name, "isa"); | |
360 | } | |
361 | ||
362 | static void of_bus_isa_count_cells(struct device_node *child, | |
363 | int *addrc, int *sizec) | |
364 | { | |
365 | if (addrc) | |
366 | *addrc = 2; | |
367 | if (sizec) | |
368 | *sizec = 1; | |
369 | } | |
370 | ||
47b1e689 | 371 | static u64 of_bus_isa_map(__be32 *addr, const __be32 *range, int na, int ns, |
0131d897 | 372 | int pna) |
dbbdee94 GL |
373 | { |
374 | u64 cp, s, da; | |
375 | ||
376 | /* Check address type match */ | |
0131d897 | 377 | if ((addr[0] ^ range[0]) & cpu_to_be32(1)) |
dbbdee94 GL |
378 | return OF_BAD_ADDR; |
379 | ||
380 | /* Read address values, skipping high cell */ | |
381 | cp = of_read_number(range + 1, na - 1); | |
382 | s = of_read_number(range + na + pna, ns); | |
383 | da = of_read_number(addr + 1, na - 1); | |
384 | ||
606ad42a | 385 | pr_debug("ISA map, cp=%llx, s=%llx, da=%llx\n", |
dbbdee94 GL |
386 | (unsigned long long)cp, (unsigned long long)s, |
387 | (unsigned long long)da); | |
388 | ||
389 | if (da < cp || da >= (cp + s)) | |
390 | return OF_BAD_ADDR; | |
391 | return da - cp; | |
392 | } | |
393 | ||
47b1e689 | 394 | static int of_bus_isa_translate(__be32 *addr, u64 offset, int na) |
dbbdee94 GL |
395 | { |
396 | return of_bus_default_translate(addr + 1, offset, na - 1); | |
397 | } | |
398 | ||
0131d897 | 399 | static unsigned int of_bus_isa_get_flags(const __be32 *addr) |
dbbdee94 GL |
400 | { |
401 | unsigned int flags = 0; | |
0131d897 | 402 | u32 w = be32_to_cpup(addr); |
dbbdee94 GL |
403 | |
404 | if (w & 1) | |
405 | flags |= IORESOURCE_IO; | |
406 | else | |
407 | flags |= IORESOURCE_MEM; | |
408 | return flags; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Array of bus specific translators | |
413 | */ | |
414 | ||
415 | static struct of_bus of_busses[] = { | |
25a31579 | 416 | #ifdef CONFIG_OF_ADDRESS_PCI |
dbbdee94 GL |
417 | /* PCI */ |
418 | { | |
419 | .name = "pci", | |
420 | .addresses = "assigned-addresses", | |
421 | .match = of_bus_pci_match, | |
422 | .count_cells = of_bus_pci_count_cells, | |
423 | .map = of_bus_pci_map, | |
424 | .translate = of_bus_pci_translate, | |
425 | .get_flags = of_bus_pci_get_flags, | |
426 | }, | |
25a31579 | 427 | #endif /* CONFIG_OF_ADDRESS_PCI */ |
dbbdee94 GL |
428 | /* ISA */ |
429 | { | |
430 | .name = "isa", | |
431 | .addresses = "reg", | |
432 | .match = of_bus_isa_match, | |
433 | .count_cells = of_bus_isa_count_cells, | |
434 | .map = of_bus_isa_map, | |
435 | .translate = of_bus_isa_translate, | |
436 | .get_flags = of_bus_isa_get_flags, | |
437 | }, | |
438 | /* Default */ | |
439 | { | |
440 | .name = "default", | |
441 | .addresses = "reg", | |
442 | .match = NULL, | |
443 | .count_cells = of_bus_default_count_cells, | |
444 | .map = of_bus_default_map, | |
445 | .translate = of_bus_default_translate, | |
446 | .get_flags = of_bus_default_get_flags, | |
447 | }, | |
448 | }; | |
449 | ||
450 | static struct of_bus *of_match_bus(struct device_node *np) | |
451 | { | |
452 | int i; | |
453 | ||
454 | for (i = 0; i < ARRAY_SIZE(of_busses); i++) | |
455 | if (!of_busses[i].match || of_busses[i].match(np)) | |
456 | return &of_busses[i]; | |
457 | BUG(); | |
458 | return NULL; | |
459 | } | |
460 | ||
41d94893 | 461 | static int of_empty_ranges_quirk(struct device_node *np) |
746c9e9f BH |
462 | { |
463 | if (IS_ENABLED(CONFIG_PPC)) { | |
41d94893 | 464 | /* To save cycles, we cache the result for global "Mac" setting */ |
746c9e9f BH |
465 | static int quirk_state = -1; |
466 | ||
41d94893 BH |
467 | /* PA-SEMI sdc DT bug */ |
468 | if (of_device_is_compatible(np, "1682m-sdc")) | |
469 | return true; | |
470 | ||
471 | /* Make quirk cached */ | |
746c9e9f BH |
472 | if (quirk_state < 0) |
473 | quirk_state = | |
474 | of_machine_is_compatible("Power Macintosh") || | |
475 | of_machine_is_compatible("MacRISC"); | |
476 | return quirk_state; | |
477 | } | |
478 | return false; | |
479 | } | |
480 | ||
dbbdee94 | 481 | static int of_translate_one(struct device_node *parent, struct of_bus *bus, |
47b1e689 | 482 | struct of_bus *pbus, __be32 *addr, |
dbbdee94 GL |
483 | int na, int ns, int pna, const char *rprop) |
484 | { | |
0131d897 | 485 | const __be32 *ranges; |
dbbdee94 GL |
486 | unsigned int rlen; |
487 | int rone; | |
488 | u64 offset = OF_BAD_ADDR; | |
489 | ||
ba85edbe MY |
490 | /* |
491 | * Normally, an absence of a "ranges" property means we are | |
dbbdee94 | 492 | * crossing a non-translatable boundary, and thus the addresses |
ba85edbe | 493 | * below the current cannot be converted to CPU physical ones. |
dbbdee94 GL |
494 | * Unfortunately, while this is very clear in the spec, it's not |
495 | * what Apple understood, and they do have things like /uni-n or | |
496 | * /ht nodes with no "ranges" property and a lot of perfectly | |
497 | * useable mapped devices below them. Thus we treat the absence of | |
498 | * "ranges" as equivalent to an empty "ranges" property which means | |
499 | * a 1:1 translation at that level. It's up to the caller not to try | |
500 | * to translate addresses that aren't supposed to be translated in | |
501 | * the first place. --BenH. | |
3930f294 GL |
502 | * |
503 | * As far as we know, this damage only exists on Apple machines, so | |
504 | * This code is only enabled on powerpc. --gcl | |
dbbdee94 GL |
505 | */ |
506 | ranges = of_get_property(parent, rprop, &rlen); | |
41d94893 | 507 | if (ranges == NULL && !of_empty_ranges_quirk(parent)) { |
606ad42a | 508 | pr_debug("no ranges; cannot translate\n"); |
3930f294 GL |
509 | return 1; |
510 | } | |
dbbdee94 GL |
511 | if (ranges == NULL || rlen == 0) { |
512 | offset = of_read_number(addr, na); | |
513 | memset(addr, 0, pna * 4); | |
606ad42a | 514 | pr_debug("empty ranges; 1:1 translation\n"); |
dbbdee94 GL |
515 | goto finish; |
516 | } | |
517 | ||
606ad42a | 518 | pr_debug("walking ranges...\n"); |
dbbdee94 GL |
519 | |
520 | /* Now walk through the ranges */ | |
521 | rlen /= 4; | |
522 | rone = na + pna + ns; | |
523 | for (; rlen >= rone; rlen -= rone, ranges += rone) { | |
524 | offset = bus->map(addr, ranges, na, ns, pna); | |
525 | if (offset != OF_BAD_ADDR) | |
526 | break; | |
527 | } | |
528 | if (offset == OF_BAD_ADDR) { | |
606ad42a | 529 | pr_debug("not found !\n"); |
dbbdee94 GL |
530 | return 1; |
531 | } | |
532 | memcpy(addr, ranges + na, 4 * pna); | |
533 | ||
534 | finish: | |
606ad42a RH |
535 | of_dump_addr("parent translation for:", addr, pna); |
536 | pr_debug("with offset: %llx\n", (unsigned long long)offset); | |
dbbdee94 GL |
537 | |
538 | /* Translate it into parent bus space */ | |
539 | return pbus->translate(addr, offset, pna); | |
540 | } | |
541 | ||
542 | /* | |
543 | * Translate an address from the device-tree into a CPU physical address, | |
544 | * this walks up the tree and applies the various bus mappings on the | |
545 | * way. | |
546 | * | |
547 | * Note: We consider that crossing any level with #size-cells == 0 to mean | |
548 | * that translation is impossible (that is we are not dealing with a value | |
549 | * that can be mapped to a cpu physical address). This is not really specified | |
550 | * that way, but this is traditionally the way IBM at least do things | |
551 | */ | |
47b1e689 KP |
552 | static u64 __of_translate_address(struct device_node *dev, |
553 | const __be32 *in_addr, const char *rprop) | |
dbbdee94 GL |
554 | { |
555 | struct device_node *parent = NULL; | |
556 | struct of_bus *bus, *pbus; | |
47b1e689 | 557 | __be32 addr[OF_MAX_ADDR_CELLS]; |
dbbdee94 GL |
558 | int na, ns, pna, pns; |
559 | u64 result = OF_BAD_ADDR; | |
560 | ||
0d638a07 | 561 | pr_debug("** translation for device %pOF **\n", dev); |
dbbdee94 GL |
562 | |
563 | /* Increase refcount at current level */ | |
564 | of_node_get(dev); | |
565 | ||
566 | /* Get parent & match bus type */ | |
567 | parent = of_get_parent(dev); | |
568 | if (parent == NULL) | |
569 | goto bail; | |
570 | bus = of_match_bus(parent); | |
571 | ||
59f5ca48 | 572 | /* Count address cells & copy address locally */ |
dbbdee94 GL |
573 | bus->count_cells(dev, &na, &ns); |
574 | if (!OF_CHECK_COUNTS(na, ns)) { | |
0d638a07 | 575 | pr_debug("Bad cell count for %pOF\n", dev); |
dbbdee94 GL |
576 | goto bail; |
577 | } | |
578 | memcpy(addr, in_addr, na * 4); | |
579 | ||
0d638a07 RH |
580 | pr_debug("bus is %s (na=%d, ns=%d) on %pOF\n", |
581 | bus->name, na, ns, parent); | |
606ad42a | 582 | of_dump_addr("translating address:", addr, na); |
dbbdee94 GL |
583 | |
584 | /* Translate */ | |
585 | for (;;) { | |
586 | /* Switch to parent bus */ | |
587 | of_node_put(dev); | |
588 | dev = parent; | |
589 | parent = of_get_parent(dev); | |
590 | ||
591 | /* If root, we have finished */ | |
592 | if (parent == NULL) { | |
606ad42a | 593 | pr_debug("reached root node\n"); |
dbbdee94 GL |
594 | result = of_read_number(addr, na); |
595 | break; | |
596 | } | |
597 | ||
598 | /* Get new parent bus and counts */ | |
599 | pbus = of_match_bus(parent); | |
600 | pbus->count_cells(dev, &pna, &pns); | |
601 | if (!OF_CHECK_COUNTS(pna, pns)) { | |
0d638a07 | 602 | pr_err("Bad cell count for %pOF\n", dev); |
dbbdee94 GL |
603 | break; |
604 | } | |
605 | ||
0d638a07 RH |
606 | pr_debug("parent bus is %s (na=%d, ns=%d) on %pOF\n", |
607 | pbus->name, pna, pns, parent); | |
dbbdee94 GL |
608 | |
609 | /* Apply bus translation */ | |
610 | if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop)) | |
611 | break; | |
612 | ||
613 | /* Complete the move up one level */ | |
614 | na = pna; | |
615 | ns = pns; | |
616 | bus = pbus; | |
617 | ||
606ad42a | 618 | of_dump_addr("one level translation:", addr, na); |
dbbdee94 GL |
619 | } |
620 | bail: | |
621 | of_node_put(parent); | |
622 | of_node_put(dev); | |
623 | ||
624 | return result; | |
625 | } | |
626 | ||
0131d897 | 627 | u64 of_translate_address(struct device_node *dev, const __be32 *in_addr) |
dbbdee94 GL |
628 | { |
629 | return __of_translate_address(dev, in_addr, "ranges"); | |
630 | } | |
631 | EXPORT_SYMBOL(of_translate_address); | |
632 | ||
0131d897 | 633 | u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr) |
dbbdee94 GL |
634 | { |
635 | return __of_translate_address(dev, in_addr, "dma-ranges"); | |
636 | } | |
637 | EXPORT_SYMBOL(of_translate_dma_address); | |
638 | ||
0131d897 | 639 | const __be32 *of_get_address(struct device_node *dev, int index, u64 *size, |
dbbdee94 GL |
640 | unsigned int *flags) |
641 | { | |
0131d897 | 642 | const __be32 *prop; |
dbbdee94 GL |
643 | unsigned int psize; |
644 | struct device_node *parent; | |
645 | struct of_bus *bus; | |
646 | int onesize, i, na, ns; | |
647 | ||
648 | /* Get parent & match bus type */ | |
649 | parent = of_get_parent(dev); | |
650 | if (parent == NULL) | |
651 | return NULL; | |
652 | bus = of_match_bus(parent); | |
653 | bus->count_cells(dev, &na, &ns); | |
654 | of_node_put(parent); | |
5d61b165 | 655 | if (!OF_CHECK_ADDR_COUNT(na)) |
dbbdee94 GL |
656 | return NULL; |
657 | ||
658 | /* Get "reg" or "assigned-addresses" property */ | |
659 | prop = of_get_property(dev, bus->addresses, &psize); | |
660 | if (prop == NULL) | |
661 | return NULL; | |
662 | psize /= 4; | |
663 | ||
664 | onesize = na + ns; | |
665 | for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) | |
666 | if (i == index) { | |
667 | if (size) | |
668 | *size = of_read_number(prop + na, ns); | |
669 | if (flags) | |
670 | *flags = bus->get_flags(prop); | |
671 | return prop; | |
672 | } | |
673 | return NULL; | |
674 | } | |
675 | EXPORT_SYMBOL(of_get_address); | |
676 | ||
0131d897 SAS |
677 | static int __of_address_to_resource(struct device_node *dev, |
678 | const __be32 *addrp, u64 size, unsigned int flags, | |
35f3da32 | 679 | const char *name, struct resource *r) |
1f5bef30 GL |
680 | { |
681 | u64 taddr; | |
682 | ||
683 | if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) | |
684 | return -EINVAL; | |
685 | taddr = of_translate_address(dev, addrp); | |
686 | if (taddr == OF_BAD_ADDR) | |
687 | return -EINVAL; | |
688 | memset(r, 0, sizeof(struct resource)); | |
689 | if (flags & IORESOURCE_IO) { | |
690 | unsigned long port; | |
691 | port = pci_address_to_pio(taddr); | |
692 | if (port == (unsigned long)-1) | |
693 | return -EINVAL; | |
694 | r->start = port; | |
695 | r->end = port + size - 1; | |
696 | } else { | |
697 | r->start = taddr; | |
698 | r->end = taddr + size - 1; | |
699 | } | |
700 | r->flags = flags; | |
35f3da32 BC |
701 | r->name = name ? name : dev->full_name; |
702 | ||
1f5bef30 GL |
703 | return 0; |
704 | } | |
705 | ||
706 | /** | |
707 | * of_address_to_resource - Translate device tree address and return as resource | |
708 | * | |
709 | * Note that if your address is a PIO address, the conversion will fail if | |
710 | * the physical address can't be internally converted to an IO token with | |
7602f422 | 711 | * pci_address_to_pio(), that is because it's either called too early or it |
1f5bef30 GL |
712 | * can't be matched to any host bridge IO space |
713 | */ | |
714 | int of_address_to_resource(struct device_node *dev, int index, | |
715 | struct resource *r) | |
716 | { | |
0131d897 | 717 | const __be32 *addrp; |
1f5bef30 GL |
718 | u64 size; |
719 | unsigned int flags; | |
35f3da32 | 720 | const char *name = NULL; |
1f5bef30 GL |
721 | |
722 | addrp = of_get_address(dev, index, &size, &flags); | |
723 | if (addrp == NULL) | |
724 | return -EINVAL; | |
35f3da32 BC |
725 | |
726 | /* Get optional "reg-names" property to add a name to a resource */ | |
727 | of_property_read_string_index(dev, "reg-names", index, &name); | |
728 | ||
729 | return __of_address_to_resource(dev, addrp, size, flags, name, r); | |
1f5bef30 GL |
730 | } |
731 | EXPORT_SYMBOL_GPL(of_address_to_resource); | |
732 | ||
90e33f62 GL |
733 | struct device_node *of_find_matching_node_by_address(struct device_node *from, |
734 | const struct of_device_id *matches, | |
735 | u64 base_address) | |
736 | { | |
737 | struct device_node *dn = of_find_matching_node(from, matches); | |
738 | struct resource res; | |
739 | ||
740 | while (dn) { | |
3a496b00 DD |
741 | if (!of_address_to_resource(dn, 0, &res) && |
742 | res.start == base_address) | |
90e33f62 | 743 | return dn; |
3a496b00 | 744 | |
90e33f62 GL |
745 | dn = of_find_matching_node(dn, matches); |
746 | } | |
747 | ||
748 | return NULL; | |
749 | } | |
750 | ||
1f5bef30 | 751 | |
6b884a8d GL |
752 | /** |
753 | * of_iomap - Maps the memory mapped IO for a given device_node | |
754 | * @device: the device whose io range will be mapped | |
755 | * @index: index of the io range | |
756 | * | |
757 | * Returns a pointer to the mapped memory | |
758 | */ | |
759 | void __iomem *of_iomap(struct device_node *np, int index) | |
760 | { | |
761 | struct resource res; | |
762 | ||
763 | if (of_address_to_resource(np, index, &res)) | |
764 | return NULL; | |
765 | ||
28c1b6d6 | 766 | return ioremap(res.start, resource_size(&res)); |
6b884a8d GL |
767 | } |
768 | EXPORT_SYMBOL(of_iomap); | |
18308c94 | 769 | |
efd342fb MB |
770 | /* |
771 | * of_io_request_and_map - Requests a resource and maps the memory mapped IO | |
772 | * for a given device_node | |
773 | * @device: the device whose io range will be mapped | |
774 | * @index: index of the io range | |
775 | * @name: name of the resource | |
776 | * | |
777 | * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded | |
778 | * error code on failure. Usage example: | |
779 | * | |
780 | * base = of_io_request_and_map(node, 0, "foo"); | |
781 | * if (IS_ERR(base)) | |
782 | * return PTR_ERR(base); | |
783 | */ | |
784 | void __iomem *of_io_request_and_map(struct device_node *np, int index, | |
b75b276b | 785 | const char *name) |
efd342fb MB |
786 | { |
787 | struct resource res; | |
788 | void __iomem *mem; | |
789 | ||
790 | if (of_address_to_resource(np, index, &res)) | |
791 | return IOMEM_ERR_PTR(-EINVAL); | |
792 | ||
793 | if (!request_mem_region(res.start, resource_size(&res), name)) | |
794 | return IOMEM_ERR_PTR(-EBUSY); | |
795 | ||
796 | mem = ioremap(res.start, resource_size(&res)); | |
797 | if (!mem) { | |
798 | release_mem_region(res.start, resource_size(&res)); | |
799 | return IOMEM_ERR_PTR(-ENOMEM); | |
800 | } | |
801 | ||
802 | return mem; | |
803 | } | |
804 | EXPORT_SYMBOL(of_io_request_and_map); | |
805 | ||
18308c94 GS |
806 | /** |
807 | * of_dma_get_range - Get DMA range info | |
808 | * @np: device node to get DMA range info | |
809 | * @dma_addr: pointer to store initial DMA address of DMA range | |
810 | * @paddr: pointer to store initial CPU address of DMA range | |
811 | * @size: pointer to store size of DMA range | |
812 | * | |
813 | * Look in bottom up direction for the first "dma-ranges" property | |
814 | * and parse it. | |
815 | * dma-ranges format: | |
816 | * DMA addr (dma_addr) : naddr cells | |
817 | * CPU addr (phys_addr_t) : pna cells | |
818 | * size : nsize cells | |
819 | * | |
820 | * It returns -ENODEV if "dma-ranges" property was not found | |
821 | * for this device in DT. | |
822 | */ | |
823 | int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size) | |
824 | { | |
825 | struct device_node *node = of_node_get(np); | |
826 | const __be32 *ranges = NULL; | |
827 | int len, naddr, nsize, pna; | |
828 | int ret = 0; | |
829 | u64 dmaaddr; | |
830 | ||
831 | if (!node) | |
832 | return -EINVAL; | |
833 | ||
834 | while (1) { | |
835 | naddr = of_n_addr_cells(node); | |
836 | nsize = of_n_size_cells(node); | |
837 | node = of_get_next_parent(node); | |
838 | if (!node) | |
839 | break; | |
840 | ||
841 | ranges = of_get_property(node, "dma-ranges", &len); | |
842 | ||
843 | /* Ignore empty ranges, they imply no translation required */ | |
844 | if (ranges && len > 0) | |
845 | break; | |
846 | ||
847 | /* | |
848 | * At least empty ranges has to be defined for parent node if | |
849 | * DMA is supported | |
850 | */ | |
851 | if (!ranges) | |
852 | break; | |
853 | } | |
854 | ||
855 | if (!ranges) { | |
0d638a07 | 856 | pr_debug("no dma-ranges found for node(%pOF)\n", np); |
18308c94 GS |
857 | ret = -ENODEV; |
858 | goto out; | |
859 | } | |
860 | ||
861 | len /= sizeof(u32); | |
862 | ||
863 | pna = of_n_addr_cells(node); | |
864 | ||
865 | /* dma-ranges format: | |
866 | * DMA addr : naddr cells | |
867 | * CPU addr : pna cells | |
868 | * size : nsize cells | |
869 | */ | |
870 | dmaaddr = of_read_number(ranges, naddr); | |
871 | *paddr = of_translate_dma_address(np, ranges); | |
872 | if (*paddr == OF_BAD_ADDR) { | |
0d638a07 RH |
873 | pr_err("translation of DMA address(%pad) to CPU address failed node(%pOF)\n", |
874 | dma_addr, np); | |
18308c94 GS |
875 | ret = -EINVAL; |
876 | goto out; | |
877 | } | |
878 | *dma_addr = dmaaddr; | |
879 | ||
880 | *size = of_read_number(ranges + naddr + pna, nsize); | |
881 | ||
882 | pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", | |
883 | *dma_addr, *paddr, *size); | |
884 | ||
885 | out: | |
886 | of_node_put(node); | |
887 | ||
888 | return ret; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(of_dma_get_range); | |
92ea637e SS |
891 | |
892 | /** | |
893 | * of_dma_is_coherent - Check if device is coherent | |
894 | * @np: device node | |
895 | * | |
896 | * It returns true if "dma-coherent" property was found | |
897 | * for this device in DT. | |
898 | */ | |
899 | bool of_dma_is_coherent(struct device_node *np) | |
900 | { | |
901 | struct device_node *node = of_node_get(np); | |
902 | ||
903 | while (node) { | |
904 | if (of_property_read_bool(node, "dma-coherent")) { | |
905 | of_node_put(node); | |
906 | return true; | |
907 | } | |
908 | node = of_get_next_parent(node); | |
909 | } | |
910 | of_node_put(node); | |
911 | return false; | |
912 | } | |
eb3d3ec5 | 913 | EXPORT_SYMBOL_GPL(of_dma_is_coherent); |