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d1405b86 BH |
1 | #undef DEBUG |
2 | ||
3 | #include <linux/kernel.h> | |
4 | #include <linux/string.h> | |
5 | #include <linux/pci_regs.h> | |
6 | #include <linux/module.h> | |
d2dd482b | 7 | #include <linux/ioport.h> |
d1405b86 | 8 | #include <asm/prom.h> |
d2dd482b | 9 | #include <asm/pci-bridge.h> |
d1405b86 BH |
10 | |
11 | #ifdef DEBUG | |
12 | #define DBG(fmt...) do { printk(fmt); } while(0) | |
13 | #else | |
14 | #define DBG(fmt...) do { } while(0) | |
15 | #endif | |
16 | ||
17 | #ifdef CONFIG_PPC64 | |
18 | #define PRu64 "%lx" | |
19 | #else | |
20 | #define PRu64 "%llx" | |
21 | #endif | |
22 | ||
23 | /* Max address size we deal with */ | |
24 | #define OF_MAX_ADDR_CELLS 4 | |
25 | #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ | |
26 | (ns) > 0) | |
27 | ||
28 | /* Debug utility */ | |
29 | #ifdef DEBUG | |
b5a1a9ab | 30 | static void of_dump_addr(const char *s, const u32 *addr, int na) |
d1405b86 BH |
31 | { |
32 | printk("%s", s); | |
33 | while(na--) | |
34 | printk(" %08x", *(addr++)); | |
35 | printk("\n"); | |
36 | } | |
37 | #else | |
b5a1a9ab | 38 | static void of_dump_addr(const char *s, const u32 *addr, int na) { } |
d1405b86 BH |
39 | #endif |
40 | ||
d1405b86 BH |
41 | |
42 | /* Callbacks for bus specific translators */ | |
43 | struct of_bus { | |
44 | const char *name; | |
45 | const char *addresses; | |
46 | int (*match)(struct device_node *parent); | |
47 | void (*count_cells)(struct device_node *child, | |
48 | int *addrc, int *sizec); | |
b5a1a9ab JK |
49 | u64 (*map)(u32 *addr, const u32 *range, |
50 | int na, int ns, int pna); | |
d1405b86 | 51 | int (*translate)(u32 *addr, u64 offset, int na); |
b5a1a9ab | 52 | unsigned int (*get_flags)(const u32 *addr); |
d1405b86 BH |
53 | }; |
54 | ||
55 | ||
56 | /* | |
57 | * Default translator (generic bus) | |
58 | */ | |
59 | ||
d2dd482b BH |
60 | static void of_bus_default_count_cells(struct device_node *dev, |
61 | int *addrc, int *sizec) | |
d1405b86 BH |
62 | { |
63 | if (addrc) | |
64 | *addrc = prom_n_addr_cells(dev); | |
65 | if (sizec) | |
66 | *sizec = prom_n_size_cells(dev); | |
67 | } | |
68 | ||
b5a1a9ab JK |
69 | static u64 of_bus_default_map(u32 *addr, const u32 *range, |
70 | int na, int ns, int pna) | |
d1405b86 BH |
71 | { |
72 | u64 cp, s, da; | |
73 | ||
cc9fd71c BH |
74 | cp = of_read_number(range, na); |
75 | s = of_read_number(range + na + pna, ns); | |
76 | da = of_read_number(addr, na); | |
d1405b86 BH |
77 | |
78 | DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", | |
79 | cp, s, da); | |
80 | ||
81 | if (da < cp || da >= (cp + s)) | |
82 | return OF_BAD_ADDR; | |
83 | return da - cp; | |
84 | } | |
85 | ||
d2dd482b | 86 | static int of_bus_default_translate(u32 *addr, u64 offset, int na) |
d1405b86 | 87 | { |
cc9fd71c | 88 | u64 a = of_read_number(addr, na); |
d1405b86 BH |
89 | memset(addr, 0, na * 4); |
90 | a += offset; | |
91 | if (na > 1) | |
92 | addr[na - 2] = a >> 32; | |
93 | addr[na - 1] = a & 0xffffffffu; | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
b5a1a9ab | 98 | static unsigned int of_bus_default_get_flags(const u32 *addr) |
d2dd482b BH |
99 | { |
100 | return IORESOURCE_MEM; | |
101 | } | |
102 | ||
d1405b86 BH |
103 | |
104 | /* | |
105 | * PCI bus specific translator | |
106 | */ | |
107 | ||
108 | static int of_bus_pci_match(struct device_node *np) | |
109 | { | |
d5f07900 PM |
110 | /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */ |
111 | return !strcmp(np->type, "pci") || !strcmp(np->type, "vci"); | |
d1405b86 BH |
112 | } |
113 | ||
114 | static void of_bus_pci_count_cells(struct device_node *np, | |
115 | int *addrc, int *sizec) | |
116 | { | |
117 | if (addrc) | |
118 | *addrc = 3; | |
119 | if (sizec) | |
120 | *sizec = 2; | |
121 | } | |
122 | ||
b5a1a9ab | 123 | static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna) |
d1405b86 BH |
124 | { |
125 | u64 cp, s, da; | |
126 | ||
127 | /* Check address type match */ | |
128 | if ((addr[0] ^ range[0]) & 0x03000000) | |
129 | return OF_BAD_ADDR; | |
130 | ||
131 | /* Read address values, skipping high cell */ | |
cc9fd71c BH |
132 | cp = of_read_number(range + 1, na - 1); |
133 | s = of_read_number(range + na + pna, ns); | |
134 | da = of_read_number(addr + 1, na - 1); | |
d1405b86 BH |
135 | |
136 | DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da); | |
137 | ||
138 | if (da < cp || da >= (cp + s)) | |
139 | return OF_BAD_ADDR; | |
140 | return da - cp; | |
141 | } | |
142 | ||
143 | static int of_bus_pci_translate(u32 *addr, u64 offset, int na) | |
144 | { | |
d2dd482b BH |
145 | return of_bus_default_translate(addr + 1, offset, na - 1); |
146 | } | |
147 | ||
b5a1a9ab | 148 | static unsigned int of_bus_pci_get_flags(const u32 *addr) |
d2dd482b BH |
149 | { |
150 | unsigned int flags = 0; | |
151 | u32 w = addr[0]; | |
152 | ||
153 | switch((w >> 24) & 0x03) { | |
154 | case 0x01: | |
155 | flags |= IORESOURCE_IO; | |
156 | case 0x02: /* 32 bits */ | |
157 | case 0x03: /* 64 bits */ | |
158 | flags |= IORESOURCE_MEM; | |
159 | } | |
160 | if (w & 0x40000000) | |
161 | flags |= IORESOURCE_PREFETCH; | |
162 | return flags; | |
d1405b86 BH |
163 | } |
164 | ||
165 | /* | |
166 | * ISA bus specific translator | |
167 | */ | |
168 | ||
169 | static int of_bus_isa_match(struct device_node *np) | |
170 | { | |
171 | return !strcmp(np->name, "isa"); | |
172 | } | |
173 | ||
174 | static void of_bus_isa_count_cells(struct device_node *child, | |
175 | int *addrc, int *sizec) | |
176 | { | |
177 | if (addrc) | |
178 | *addrc = 2; | |
179 | if (sizec) | |
180 | *sizec = 1; | |
181 | } | |
182 | ||
b5a1a9ab | 183 | static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna) |
d1405b86 BH |
184 | { |
185 | u64 cp, s, da; | |
186 | ||
187 | /* Check address type match */ | |
188 | if ((addr[0] ^ range[0]) & 0x00000001) | |
189 | return OF_BAD_ADDR; | |
190 | ||
191 | /* Read address values, skipping high cell */ | |
cc9fd71c BH |
192 | cp = of_read_number(range + 1, na - 1); |
193 | s = of_read_number(range + na + pna, ns); | |
194 | da = of_read_number(addr + 1, na - 1); | |
d1405b86 BH |
195 | |
196 | DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da); | |
197 | ||
198 | if (da < cp || da >= (cp + s)) | |
199 | return OF_BAD_ADDR; | |
200 | return da - cp; | |
201 | } | |
202 | ||
203 | static int of_bus_isa_translate(u32 *addr, u64 offset, int na) | |
204 | { | |
d2dd482b BH |
205 | return of_bus_default_translate(addr + 1, offset, na - 1); |
206 | } | |
207 | ||
b5a1a9ab | 208 | static unsigned int of_bus_isa_get_flags(const u32 *addr) |
d2dd482b BH |
209 | { |
210 | unsigned int flags = 0; | |
211 | u32 w = addr[0]; | |
212 | ||
213 | if (w & 1) | |
214 | flags |= IORESOURCE_IO; | |
215 | else | |
216 | flags |= IORESOURCE_MEM; | |
217 | return flags; | |
d1405b86 BH |
218 | } |
219 | ||
d2dd482b | 220 | |
d1405b86 BH |
221 | /* |
222 | * Array of bus specific translators | |
223 | */ | |
224 | ||
225 | static struct of_bus of_busses[] = { | |
226 | /* PCI */ | |
227 | { | |
228 | .name = "pci", | |
229 | .addresses = "assigned-addresses", | |
230 | .match = of_bus_pci_match, | |
231 | .count_cells = of_bus_pci_count_cells, | |
232 | .map = of_bus_pci_map, | |
233 | .translate = of_bus_pci_translate, | |
d2dd482b | 234 | .get_flags = of_bus_pci_get_flags, |
d1405b86 BH |
235 | }, |
236 | /* ISA */ | |
237 | { | |
238 | .name = "isa", | |
239 | .addresses = "reg", | |
240 | .match = of_bus_isa_match, | |
241 | .count_cells = of_bus_isa_count_cells, | |
242 | .map = of_bus_isa_map, | |
243 | .translate = of_bus_isa_translate, | |
d2dd482b | 244 | .get_flags = of_bus_isa_get_flags, |
d1405b86 BH |
245 | }, |
246 | /* Default */ | |
247 | { | |
248 | .name = "default", | |
249 | .addresses = "reg", | |
250 | .match = NULL, | |
d2dd482b BH |
251 | .count_cells = of_bus_default_count_cells, |
252 | .map = of_bus_default_map, | |
253 | .translate = of_bus_default_translate, | |
254 | .get_flags = of_bus_default_get_flags, | |
d1405b86 BH |
255 | }, |
256 | }; | |
257 | ||
258 | static struct of_bus *of_match_bus(struct device_node *np) | |
259 | { | |
260 | int i; | |
261 | ||
262 | for (i = 0; i < ARRAY_SIZE(of_busses); i ++) | |
263 | if (!of_busses[i].match || of_busses[i].match(np)) | |
264 | return &of_busses[i]; | |
265 | BUG(); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | static int of_translate_one(struct device_node *parent, struct of_bus *bus, | |
270 | struct of_bus *pbus, u32 *addr, | |
271 | int na, int ns, int pna) | |
272 | { | |
a7f67bdf | 273 | const u32 *ranges; |
d1405b86 BH |
274 | unsigned int rlen; |
275 | int rone; | |
276 | u64 offset = OF_BAD_ADDR; | |
277 | ||
278 | /* Normally, an absence of a "ranges" property means we are | |
279 | * crossing a non-translatable boundary, and thus the addresses | |
280 | * below the current not cannot be converted to CPU physical ones. | |
281 | * Unfortunately, while this is very clear in the spec, it's not | |
282 | * what Apple understood, and they do have things like /uni-n or | |
283 | * /ht nodes with no "ranges" property and a lot of perfectly | |
284 | * useable mapped devices below them. Thus we treat the absence of | |
285 | * "ranges" as equivalent to an empty "ranges" property which means | |
286 | * a 1:1 translation at that level. It's up to the caller not to try | |
287 | * to translate addresses that aren't supposed to be translated in | |
288 | * the first place. --BenH. | |
289 | */ | |
a7f67bdf | 290 | ranges = get_property(parent, "ranges", &rlen); |
d1405b86 | 291 | if (ranges == NULL || rlen == 0) { |
cc9fd71c | 292 | offset = of_read_number(addr, na); |
d2dd482b BH |
293 | memset(addr, 0, pna * 4); |
294 | DBG("OF: no ranges, 1:1 translation\n"); | |
d1405b86 BH |
295 | goto finish; |
296 | } | |
297 | ||
298 | DBG("OF: walking ranges...\n"); | |
299 | ||
300 | /* Now walk through the ranges */ | |
301 | rlen /= 4; | |
302 | rone = na + pna + ns; | |
303 | for (; rlen >= rone; rlen -= rone, ranges += rone) { | |
304 | offset = bus->map(addr, ranges, na, ns, pna); | |
305 | if (offset != OF_BAD_ADDR) | |
306 | break; | |
307 | } | |
308 | if (offset == OF_BAD_ADDR) { | |
309 | DBG("OF: not found !\n"); | |
310 | return 1; | |
311 | } | |
312 | memcpy(addr, ranges + na, 4 * pna); | |
313 | ||
314 | finish: | |
315 | of_dump_addr("OF: parent translation for:", addr, pna); | |
bb6b9b28 | 316 | DBG("OF: with offset: "PRu64"\n", offset); |
d1405b86 BH |
317 | |
318 | /* Translate it into parent bus space */ | |
319 | return pbus->translate(addr, offset, pna); | |
320 | } | |
321 | ||
322 | ||
323 | /* | |
324 | * Translate an address from the device-tree into a CPU physical address, | |
325 | * this walks up the tree and applies the various bus mappings on the | |
326 | * way. | |
327 | * | |
328 | * Note: We consider that crossing any level with #size-cells == 0 to mean | |
329 | * that translation is impossible (that is we are not dealing with a value | |
330 | * that can be mapped to a cpu physical address). This is not really specified | |
331 | * that way, but this is traditionally the way IBM at least do things | |
332 | */ | |
a7f67bdf | 333 | u64 of_translate_address(struct device_node *dev, const u32 *in_addr) |
d1405b86 BH |
334 | { |
335 | struct device_node *parent = NULL; | |
336 | struct of_bus *bus, *pbus; | |
337 | u32 addr[OF_MAX_ADDR_CELLS]; | |
338 | int na, ns, pna, pns; | |
339 | u64 result = OF_BAD_ADDR; | |
340 | ||
341 | DBG("OF: ** translation for device %s **\n", dev->full_name); | |
342 | ||
343 | /* Increase refcount at current level */ | |
344 | of_node_get(dev); | |
345 | ||
346 | /* Get parent & match bus type */ | |
347 | parent = of_get_parent(dev); | |
348 | if (parent == NULL) | |
349 | goto bail; | |
350 | bus = of_match_bus(parent); | |
351 | ||
352 | /* Cound address cells & copy address locally */ | |
353 | bus->count_cells(dev, &na, &ns); | |
354 | if (!OF_CHECK_COUNTS(na, ns)) { | |
355 | printk(KERN_ERR "prom_parse: Bad cell count for %s\n", | |
356 | dev->full_name); | |
357 | goto bail; | |
358 | } | |
359 | memcpy(addr, in_addr, na * 4); | |
360 | ||
361 | DBG("OF: bus is %s (na=%d, ns=%d) on %s\n", | |
362 | bus->name, na, ns, parent->full_name); | |
363 | of_dump_addr("OF: translating address:", addr, na); | |
364 | ||
365 | /* Translate */ | |
366 | for (;;) { | |
367 | /* Switch to parent bus */ | |
368 | of_node_put(dev); | |
369 | dev = parent; | |
370 | parent = of_get_parent(dev); | |
371 | ||
372 | /* If root, we have finished */ | |
373 | if (parent == NULL) { | |
374 | DBG("OF: reached root node\n"); | |
cc9fd71c | 375 | result = of_read_number(addr, na); |
d1405b86 BH |
376 | break; |
377 | } | |
378 | ||
379 | /* Get new parent bus and counts */ | |
380 | pbus = of_match_bus(parent); | |
381 | pbus->count_cells(dev, &pna, &pns); | |
382 | if (!OF_CHECK_COUNTS(pna, pns)) { | |
383 | printk(KERN_ERR "prom_parse: Bad cell count for %s\n", | |
384 | dev->full_name); | |
385 | break; | |
386 | } | |
387 | ||
388 | DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n", | |
389 | pbus->name, pna, pns, parent->full_name); | |
390 | ||
391 | /* Apply bus translation */ | |
392 | if (of_translate_one(dev, bus, pbus, addr, na, ns, pna)) | |
393 | break; | |
394 | ||
395 | /* Complete the move up one level */ | |
396 | na = pna; | |
397 | ns = pns; | |
398 | bus = pbus; | |
399 | ||
400 | of_dump_addr("OF: one level translation:", addr, na); | |
401 | } | |
402 | bail: | |
403 | of_node_put(parent); | |
404 | of_node_put(dev); | |
405 | ||
406 | return result; | |
407 | } | |
408 | EXPORT_SYMBOL(of_translate_address); | |
409 | ||
a7f67bdf | 410 | const u32 *of_get_address(struct device_node *dev, int index, u64 *size, |
d2dd482b | 411 | unsigned int *flags) |
d1405b86 | 412 | { |
a7f67bdf | 413 | const u32 *prop; |
d1405b86 BH |
414 | unsigned int psize; |
415 | struct device_node *parent; | |
416 | struct of_bus *bus; | |
417 | int onesize, i, na, ns; | |
418 | ||
419 | /* Get parent & match bus type */ | |
420 | parent = of_get_parent(dev); | |
421 | if (parent == NULL) | |
422 | return NULL; | |
423 | bus = of_match_bus(parent); | |
424 | bus->count_cells(dev, &na, &ns); | |
425 | of_node_put(parent); | |
426 | if (!OF_CHECK_COUNTS(na, ns)) | |
427 | return NULL; | |
428 | ||
429 | /* Get "reg" or "assigned-addresses" property */ | |
a7f67bdf | 430 | prop = get_property(dev, bus->addresses, &psize); |
d1405b86 BH |
431 | if (prop == NULL) |
432 | return NULL; | |
433 | psize /= 4; | |
434 | ||
435 | onesize = na + ns; | |
436 | for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) | |
437 | if (i == index) { | |
438 | if (size) | |
cc9fd71c | 439 | *size = of_read_number(prop + na, ns); |
d2dd482b BH |
440 | if (flags) |
441 | *flags = bus->get_flags(prop); | |
d1405b86 BH |
442 | return prop; |
443 | } | |
444 | return NULL; | |
445 | } | |
446 | EXPORT_SYMBOL(of_get_address); | |
447 | ||
a7f67bdf | 448 | const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size, |
d2dd482b | 449 | unsigned int *flags) |
d1405b86 | 450 | { |
a7f67bdf | 451 | const u32 *prop; |
d2dd482b BH |
452 | unsigned int psize; |
453 | struct device_node *parent; | |
454 | struct of_bus *bus; | |
455 | int onesize, i, na, ns; | |
d1405b86 | 456 | |
d2dd482b BH |
457 | /* Get parent & match bus type */ |
458 | parent = of_get_parent(dev); | |
459 | if (parent == NULL) | |
460 | return NULL; | |
461 | bus = of_match_bus(parent); | |
d60dcd94 OH |
462 | if (strcmp(bus->name, "pci")) { |
463 | of_node_put(parent); | |
d2dd482b | 464 | return NULL; |
d60dcd94 | 465 | } |
d2dd482b BH |
466 | bus->count_cells(dev, &na, &ns); |
467 | of_node_put(parent); | |
468 | if (!OF_CHECK_COUNTS(na, ns)) | |
469 | return NULL; | |
470 | ||
471 | /* Get "reg" or "assigned-addresses" property */ | |
a7f67bdf | 472 | prop = get_property(dev, bus->addresses, &psize); |
d2dd482b BH |
473 | if (prop == NULL) |
474 | return NULL; | |
475 | psize /= 4; | |
476 | ||
477 | onesize = na + ns; | |
478 | for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) | |
479 | if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) { | |
480 | if (size) | |
cc9fd71c | 481 | *size = of_read_number(prop + na, ns); |
d2dd482b BH |
482 | if (flags) |
483 | *flags = bus->get_flags(prop); | |
484 | return prop; | |
485 | } | |
d1405b86 BH |
486 | return NULL; |
487 | } | |
488 | EXPORT_SYMBOL(of_get_pci_address); | |
d2dd482b | 489 | |
a7f67bdf | 490 | static int __of_address_to_resource(struct device_node *dev, const u32 *addrp, |
d2dd482b BH |
491 | u64 size, unsigned int flags, |
492 | struct resource *r) | |
493 | { | |
494 | u64 taddr; | |
495 | ||
496 | if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) | |
497 | return -EINVAL; | |
498 | taddr = of_translate_address(dev, addrp); | |
499 | if (taddr == OF_BAD_ADDR) | |
500 | return -EINVAL; | |
501 | memset(r, 0, sizeof(struct resource)); | |
502 | if (flags & IORESOURCE_IO) { | |
f2c4583a | 503 | unsigned long port; |
d2dd482b | 504 | port = pci_address_to_pio(taddr); |
f2c4583a | 505 | if (port == (unsigned long)-1) |
d2dd482b BH |
506 | return -EINVAL; |
507 | r->start = port; | |
508 | r->end = port + size - 1; | |
509 | } else { | |
510 | r->start = taddr; | |
511 | r->end = taddr + size - 1; | |
512 | } | |
513 | r->flags = flags; | |
514 | r->name = dev->name; | |
515 | return 0; | |
516 | } | |
517 | ||
518 | int of_address_to_resource(struct device_node *dev, int index, | |
519 | struct resource *r) | |
520 | { | |
a7f67bdf | 521 | const u32 *addrp; |
d2dd482b BH |
522 | u64 size; |
523 | unsigned int flags; | |
524 | ||
525 | addrp = of_get_address(dev, index, &size, &flags); | |
526 | if (addrp == NULL) | |
527 | return -EINVAL; | |
528 | return __of_address_to_resource(dev, addrp, size, flags, r); | |
529 | } | |
530 | EXPORT_SYMBOL_GPL(of_address_to_resource); | |
531 | ||
532 | int of_pci_address_to_resource(struct device_node *dev, int bar, | |
533 | struct resource *r) | |
534 | { | |
a7f67bdf | 535 | const u32 *addrp; |
d2dd482b BH |
536 | u64 size; |
537 | unsigned int flags; | |
538 | ||
539 | addrp = of_get_pci_address(dev, bar, &size, &flags); | |
540 | if (addrp == NULL) | |
541 | return -EINVAL; | |
542 | return __of_address_to_resource(dev, addrp, size, flags, r); | |
543 | } | |
544 | EXPORT_SYMBOL_GPL(of_pci_address_to_resource); | |
d4ad66fa | 545 | |
a7f67bdf | 546 | void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop, |
d4ad66fa JK |
547 | unsigned long *busno, unsigned long *phys, unsigned long *size) |
548 | { | |
a7f67bdf JK |
549 | const u32 *dma_window; |
550 | u32 cells; | |
551 | const unsigned char *prop; | |
d4ad66fa | 552 | |
a7f67bdf | 553 | dma_window = dma_window_prop; |
d4ad66fa JK |
554 | |
555 | /* busno is always one cell */ | |
556 | *busno = *(dma_window++); | |
557 | ||
558 | prop = get_property(dn, "ibm,#dma-address-cells", NULL); | |
03ac829b WS |
559 | if (!prop) |
560 | prop = get_property(dn, "#address-cells", NULL); | |
561 | ||
d4ad66fa | 562 | cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn); |
cc9fd71c | 563 | *phys = of_read_number(dma_window, cells); |
d4ad66fa JK |
564 | |
565 | dma_window += cells; | |
566 | ||
567 | prop = get_property(dn, "ibm,#dma-size-cells", NULL); | |
568 | cells = prop ? *(u32 *)prop : prom_n_size_cells(dn); | |
cc9fd71c BH |
569 | *size = of_read_number(dma_window, cells); |
570 | } | |
571 | ||
572 | /* | |
573 | * Interrupt remapper | |
574 | */ | |
575 | ||
576 | static unsigned int of_irq_workarounds; | |
577 | static struct device_node *of_irq_dflt_pic; | |
578 | ||
579 | static struct device_node *of_irq_find_parent(struct device_node *child) | |
580 | { | |
581 | struct device_node *p; | |
a7f67bdf | 582 | const phandle *parp; |
cc9fd71c BH |
583 | |
584 | if (!of_node_get(child)) | |
585 | return NULL; | |
586 | ||
587 | do { | |
a7f67bdf | 588 | parp = get_property(child, "interrupt-parent", NULL); |
cc9fd71c BH |
589 | if (parp == NULL) |
590 | p = of_get_parent(child); | |
591 | else { | |
592 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
593 | p = of_node_get(of_irq_dflt_pic); | |
594 | else | |
595 | p = of_find_node_by_phandle(*parp); | |
596 | } | |
597 | of_node_put(child); | |
598 | child = p; | |
599 | } while (p && get_property(p, "#interrupt-cells", NULL) == NULL); | |
600 | ||
601 | return p; | |
602 | } | |
603 | ||
cc9fd71c BH |
604 | /* This doesn't need to be called if you don't have any special workaround |
605 | * flags to pass | |
606 | */ | |
607 | void of_irq_map_init(unsigned int flags) | |
608 | { | |
609 | of_irq_workarounds = flags; | |
610 | ||
611 | /* OldWorld, don't bother looking at other things */ | |
612 | if (flags & OF_IMAP_OLDWORLD_MAC) | |
613 | return; | |
614 | ||
615 | /* If we don't have phandles, let's try to locate a default interrupt | |
616 | * controller (happens when booting with BootX). We do a first match | |
617 | * here, hopefully, that only ever happens on machines with one | |
618 | * controller. | |
619 | */ | |
620 | if (flags & OF_IMAP_NO_PHANDLE) { | |
621 | struct device_node *np; | |
622 | ||
623 | for(np = NULL; (np = of_find_all_nodes(np)) != NULL;) { | |
624 | if (get_property(np, "interrupt-controller", NULL) | |
625 | == NULL) | |
626 | continue; | |
627 | /* Skip /chosen/interrupt-controller */ | |
628 | if (strcmp(np->name, "chosen") == 0) | |
629 | continue; | |
630 | /* It seems like at least one person on this planet wants | |
631 | * to use BootX on a machine with an AppleKiwi controller | |
632 | * which happens to pretend to be an interrupt | |
633 | * controller too. | |
634 | */ | |
635 | if (strcmp(np->name, "AppleKiwi") == 0) | |
636 | continue; | |
637 | /* I think we found one ! */ | |
638 | of_irq_dflt_pic = np; | |
639 | break; | |
640 | } | |
641 | } | |
642 | ||
643 | } | |
644 | ||
aa43f779 | 645 | int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize, |
a7f67bdf | 646 | const u32 *addr, struct of_irq *out_irq) |
cc9fd71c BH |
647 | { |
648 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; | |
a7f67bdf | 649 | const u32 *tmp, *imap, *imask; |
cc9fd71c BH |
650 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
651 | int imaplen, match, i; | |
652 | ||
006b64de BH |
653 | DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n", |
654 | parent->full_name, intspec[0], intspec[1], ointsize); | |
655 | ||
cc9fd71c BH |
656 | ipar = of_node_get(parent); |
657 | ||
658 | /* First get the #interrupt-cells property of the current cursor | |
659 | * that tells us how to interpret the passed-in intspec. If there | |
660 | * is none, we are nice and just walk up the tree | |
661 | */ | |
662 | do { | |
a7f67bdf | 663 | tmp = get_property(ipar, "#interrupt-cells", NULL); |
cc9fd71c BH |
664 | if (tmp != NULL) { |
665 | intsize = *tmp; | |
666 | break; | |
667 | } | |
668 | tnode = ipar; | |
669 | ipar = of_irq_find_parent(ipar); | |
670 | of_node_put(tnode); | |
671 | } while (ipar); | |
672 | if (ipar == NULL) { | |
673 | DBG(" -> no parent found !\n"); | |
674 | goto fail; | |
675 | } | |
676 | ||
677 | DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize); | |
678 | ||
006b64de BH |
679 | if (ointsize != intsize) |
680 | return -EINVAL; | |
681 | ||
cc9fd71c BH |
682 | /* Look for this #address-cells. We have to implement the old linux |
683 | * trick of looking for the parent here as some device-trees rely on it | |
684 | */ | |
685 | old = of_node_get(ipar); | |
686 | do { | |
a7f67bdf | 687 | tmp = get_property(old, "#address-cells", NULL); |
cc9fd71c BH |
688 | tnode = of_get_parent(old); |
689 | of_node_put(old); | |
690 | old = tnode; | |
691 | } while(old && tmp == NULL); | |
692 | of_node_put(old); | |
693 | old = NULL; | |
694 | addrsize = (tmp == NULL) ? 2 : *tmp; | |
695 | ||
696 | DBG(" -> addrsize=%d\n", addrsize); | |
697 | ||
698 | /* Now start the actual "proper" walk of the interrupt tree */ | |
699 | while (ipar != NULL) { | |
700 | /* Now check if cursor is an interrupt-controller and if it is | |
701 | * then we are done | |
702 | */ | |
703 | if (get_property(ipar, "interrupt-controller", NULL) != NULL) { | |
704 | DBG(" -> got it !\n"); | |
705 | memcpy(out_irq->specifier, intspec, | |
706 | intsize * sizeof(u32)); | |
707 | out_irq->size = intsize; | |
708 | out_irq->controller = ipar; | |
709 | of_node_put(old); | |
710 | return 0; | |
711 | } | |
712 | ||
713 | /* Now look for an interrupt-map */ | |
a7f67bdf | 714 | imap = get_property(ipar, "interrupt-map", &imaplen); |
cc9fd71c BH |
715 | /* No interrupt map, check for an interrupt parent */ |
716 | if (imap == NULL) { | |
717 | DBG(" -> no map, getting parent\n"); | |
718 | newpar = of_irq_find_parent(ipar); | |
719 | goto skiplevel; | |
720 | } | |
721 | imaplen /= sizeof(u32); | |
722 | ||
723 | /* Look for a mask */ | |
a7f67bdf | 724 | imask = get_property(ipar, "interrupt-map-mask", NULL); |
cc9fd71c BH |
725 | |
726 | /* If we were passed no "reg" property and we attempt to parse | |
727 | * an interrupt-map, then #address-cells must be 0. | |
728 | * Fail if it's not. | |
729 | */ | |
730 | if (addr == NULL && addrsize != 0) { | |
731 | DBG(" -> no reg passed in when needed !\n"); | |
732 | goto fail; | |
733 | } | |
734 | ||
735 | /* Parse interrupt-map */ | |
736 | match = 0; | |
737 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
738 | /* Compare specifiers */ | |
739 | match = 1; | |
740 | for (i = 0; i < addrsize && match; ++i) { | |
741 | u32 mask = imask ? imask[i] : 0xffffffffu; | |
742 | match = ((addr[i] ^ imap[i]) & mask) == 0; | |
743 | } | |
744 | for (; i < (addrsize + intsize) && match; ++i) { | |
745 | u32 mask = imask ? imask[i] : 0xffffffffu; | |
746 | match = | |
747 | ((intspec[i-addrsize] ^ imap[i]) & mask) == 0; | |
748 | } | |
749 | imap += addrsize + intsize; | |
750 | imaplen -= addrsize + intsize; | |
751 | ||
752 | DBG(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
753 | ||
754 | /* Get the interrupt parent */ | |
755 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
756 | newpar = of_node_get(of_irq_dflt_pic); | |
757 | else | |
758 | newpar = of_find_node_by_phandle((phandle)*imap); | |
759 | imap++; | |
760 | --imaplen; | |
761 | ||
762 | /* Check if not found */ | |
763 | if (newpar == NULL) { | |
764 | DBG(" -> imap parent not found !\n"); | |
765 | goto fail; | |
766 | } | |
767 | ||
768 | /* Get #interrupt-cells and #address-cells of new | |
769 | * parent | |
770 | */ | |
a7f67bdf | 771 | tmp = get_property(newpar, "#interrupt-cells", |
cc9fd71c BH |
772 | NULL); |
773 | if (tmp == NULL) { | |
774 | DBG(" -> parent lacks #interrupt-cells !\n"); | |
775 | goto fail; | |
776 | } | |
777 | newintsize = *tmp; | |
a7f67bdf | 778 | tmp = get_property(newpar, "#address-cells", |
cc9fd71c BH |
779 | NULL); |
780 | newaddrsize = (tmp == NULL) ? 0 : *tmp; | |
781 | ||
782 | DBG(" -> newintsize=%d, newaddrsize=%d\n", | |
783 | newintsize, newaddrsize); | |
784 | ||
785 | /* Check for malformed properties */ | |
786 | if (imaplen < (newaddrsize + newintsize)) | |
787 | goto fail; | |
788 | ||
789 | imap += newaddrsize + newintsize; | |
790 | imaplen -= newaddrsize + newintsize; | |
791 | ||
792 | DBG(" -> imaplen=%d\n", imaplen); | |
793 | } | |
794 | if (!match) | |
795 | goto fail; | |
796 | ||
797 | of_node_put(old); | |
798 | old = of_node_get(newpar); | |
799 | addrsize = newaddrsize; | |
800 | intsize = newintsize; | |
801 | intspec = imap - intsize; | |
802 | addr = intspec - addrsize; | |
803 | ||
804 | skiplevel: | |
805 | /* Iterate again with new parent */ | |
806 | DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>"); | |
807 | of_node_put(ipar); | |
808 | ipar = newpar; | |
809 | newpar = NULL; | |
810 | } | |
811 | fail: | |
812 | of_node_put(ipar); | |
813 | of_node_put(old); | |
814 | of_node_put(newpar); | |
815 | ||
816 | return -EINVAL; | |
817 | } | |
818 | EXPORT_SYMBOL_GPL(of_irq_map_raw); | |
819 | ||
820 | #if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) | |
821 | static int of_irq_map_oldworld(struct device_node *device, int index, | |
822 | struct of_irq *out_irq) | |
823 | { | |
a7f67bdf | 824 | const u32 *ints; |
cc9fd71c BH |
825 | int intlen; |
826 | ||
827 | /* | |
828 | * Old machines just have a list of interrupt numbers | |
829 | * and no interrupt-controller nodes. | |
830 | */ | |
a7f67bdf | 831 | ints = get_property(device, "AAPL,interrupts", &intlen); |
cc9fd71c BH |
832 | if (ints == NULL) |
833 | return -EINVAL; | |
834 | intlen /= sizeof(u32); | |
835 | ||
836 | if (index >= intlen) | |
837 | return -EINVAL; | |
838 | ||
839 | out_irq->controller = NULL; | |
840 | out_irq->specifier[0] = ints[index]; | |
841 | out_irq->size = 1; | |
842 | ||
843 | return 0; | |
844 | } | |
845 | #else /* defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) */ | |
846 | static int of_irq_map_oldworld(struct device_node *device, int index, | |
847 | struct of_irq *out_irq) | |
848 | { | |
849 | return -EINVAL; | |
850 | } | |
851 | #endif /* !(defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)) */ | |
852 | ||
853 | int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq) | |
854 | { | |
855 | struct device_node *p; | |
a7f67bdf JK |
856 | const u32 *intspec, *tmp, *addr; |
857 | u32 intsize, intlen; | |
cc9fd71c BH |
858 | int res; |
859 | ||
860 | DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index); | |
861 | ||
862 | /* OldWorld mac stuff is "special", handle out of line */ | |
863 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
864 | return of_irq_map_oldworld(device, index, out_irq); | |
865 | ||
866 | /* Get the interrupts property */ | |
a7f67bdf | 867 | intspec = get_property(device, "interrupts", &intlen); |
cc9fd71c BH |
868 | if (intspec == NULL) |
869 | return -EINVAL; | |
870 | intlen /= sizeof(u32); | |
871 | ||
872 | /* Get the reg property (if any) */ | |
a7f67bdf | 873 | addr = get_property(device, "reg", NULL); |
cc9fd71c BH |
874 | |
875 | /* Look for the interrupt parent. */ | |
876 | p = of_irq_find_parent(device); | |
877 | if (p == NULL) | |
878 | return -EINVAL; | |
879 | ||
880 | /* Get size of interrupt specifier */ | |
a7f67bdf | 881 | tmp = get_property(p, "#interrupt-cells", NULL); |
cc9fd71c BH |
882 | if (tmp == NULL) { |
883 | of_node_put(p); | |
884 | return -EINVAL; | |
885 | } | |
886 | intsize = *tmp; | |
887 | ||
006b64de BH |
888 | DBG(" intsize=%d intlen=%d\n", intsize, intlen); |
889 | ||
cc9fd71c | 890 | /* Check index */ |
58d383a6 | 891 | if ((index + 1) * intsize > intlen) |
cc9fd71c BH |
892 | return -EINVAL; |
893 | ||
894 | /* Get new specifier and map it */ | |
006b64de BH |
895 | res = of_irq_map_raw(p, intspec + index * intsize, intsize, |
896 | addr, out_irq); | |
cc9fd71c BH |
897 | of_node_put(p); |
898 | return res; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(of_irq_map_one); | |
901 | ||
d55c4a76 LY |
902 | #ifdef CONFIG_PCI |
903 | static u8 of_irq_pci_swizzle(u8 slot, u8 pin) | |
904 | { | |
905 | return (((pin - 1) + slot) % 4) + 1; | |
906 | } | |
907 | ||
cc9fd71c BH |
908 | int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq) |
909 | { | |
910 | struct device_node *dn, *ppnode; | |
911 | struct pci_dev *ppdev; | |
912 | u32 lspec; | |
913 | u32 laddr[3]; | |
914 | u8 pin; | |
915 | int rc; | |
916 | ||
917 | /* Check if we have a device node, if yes, fallback to standard OF | |
918 | * parsing | |
919 | */ | |
920 | dn = pci_device_to_OF_node(pdev); | |
921 | if (dn) | |
922 | return of_irq_map_one(dn, 0, out_irq); | |
923 | ||
924 | /* Ok, we don't, time to have fun. Let's start by building up an | |
925 | * interrupt spec. we assume #interrupt-cells is 1, which is standard | |
926 | * for PCI. If you do different, then don't use that routine. | |
927 | */ | |
e24bb60e LT |
928 | rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); |
929 | if (rc != 0) | |
930 | return rc; | |
931 | /* No pin, exit */ | |
932 | if (pin == 0) | |
933 | return -ENODEV; | |
cc9fd71c BH |
934 | |
935 | /* Now we walk up the PCI tree */ | |
936 | lspec = pin; | |
937 | for (;;) { | |
938 | /* Get the pci_dev of our parent */ | |
939 | ppdev = pdev->bus->self; | |
940 | ||
941 | /* Ouch, it's a host bridge... */ | |
942 | if (ppdev == NULL) { | |
943 | #ifdef CONFIG_PPC64 | |
944 | ppnode = pci_bus_to_OF_node(pdev->bus); | |
945 | #else | |
946 | struct pci_controller *host; | |
947 | host = pci_bus_to_host(pdev->bus); | |
948 | ppnode = host ? host->arch_data : NULL; | |
949 | #endif | |
950 | /* No node for host bridge ? give up */ | |
951 | if (ppnode == NULL) | |
952 | return -EINVAL; | |
953 | } else | |
954 | /* We found a P2P bridge, check if it has a node */ | |
955 | ppnode = pci_device_to_OF_node(ppdev); | |
956 | ||
957 | /* Ok, we have found a parent with a device-node, hand over to | |
958 | * the OF parsing code. | |
959 | * We build a unit address from the linux device to be used for | |
960 | * resolution. Note that we use the linux bus number which may | |
961 | * not match your firmware bus numbering. | |
962 | * Fortunately, in most cases, interrupt-map-mask doesn't include | |
963 | * the bus number as part of the matching. | |
964 | * You should still be careful about that though if you intend | |
965 | * to rely on this function (you ship a firmware that doesn't | |
966 | * create device nodes for all PCI devices). | |
967 | */ | |
968 | if (ppnode) | |
969 | break; | |
970 | ||
971 | /* We can only get here if we hit a P2P bridge with no node, | |
972 | * let's do standard swizzling and try again | |
973 | */ | |
974 | lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec); | |
975 | pdev = ppdev; | |
976 | } | |
977 | ||
978 | laddr[0] = (pdev->bus->number << 16) | |
979 | | (pdev->devfn << 8); | |
980 | laddr[1] = laddr[2] = 0; | |
006b64de | 981 | return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq); |
cc9fd71c BH |
982 | } |
983 | EXPORT_SYMBOL_GPL(of_irq_map_pci); | |
d55c4a76 | 984 | #endif /* CONFIG_PCI */ |