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authorGrant Likely <grant.likely@secretlab.ca>2010-06-08 09:48:10 -0400
committerGrant Likely <grant.likely@secretlab.ca>2010-07-05 18:14:26 -0400
commitdbbdee94734bf6f1db7af42008a53655e77cab8f (patch)
treec0f571b0ab57a6483bc07e21e3b888e253d699ea /arch/powerpc/kernel/prom_parse.c
parent1f5bef30cf6c66f097ea5dfc580a41924df888d1 (diff)
of/address: Merge all of the bus translation code
Microblaze and PowerPC share a large chunk of code for translating OF device tree data into usable addresses. Differences between the two consist of cosmetic differences, and the addition of dma-ranges support code to powerpc but not microblaze. This patch moves the powerpc version into common code and applies many of the cosmetic (non-functional) changes from the microblaze version. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: Michal Simek <monstr@monstr.eu> CC: Wolfram Sang <w.sang@pengutronix.de> CC: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch/powerpc/kernel/prom_parse.c')
-rw-r--r--arch/powerpc/kernel/prom_parse.c515
1 files changed, 0 insertions, 515 deletions
diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 1dac535de78f..88334af038e5 100644
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -10,225 +10,7 @@
10#include <asm/prom.h> 10#include <asm/prom.h>
11#include <asm/pci-bridge.h> 11#include <asm/pci-bridge.h>
12 12
13#ifdef DEBUG
14#define DBG(fmt...) do { printk(fmt); } while(0)
15#else
16#define DBG(fmt...) do { } while(0)
17#endif
18
19#ifdef CONFIG_PPC64
20#define PRu64 "%lx"
21#else
22#define PRu64 "%llx"
23#endif
24
25/* Max address size we deal with */
26#define OF_MAX_ADDR_CELLS 4
27#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
28 (ns) > 0)
29
30static struct of_bus *of_match_bus(struct device_node *np);
31
32/* Debug utility */
33#ifdef DEBUG
34static void of_dump_addr(const char *s, const u32 *addr, int na)
35{
36 printk("%s", s);
37 while(na--)
38 printk(" %08x", *(addr++));
39 printk("\n");
40}
41#else
42static void of_dump_addr(const char *s, const u32 *addr, int na) { }
43#endif
44
45
46/* Callbacks for bus specific translators */
47struct of_bus {
48 const char *name;
49 const char *addresses;
50 int (*match)(struct device_node *parent);
51 void (*count_cells)(struct device_node *child,
52 int *addrc, int *sizec);
53 u64 (*map)(u32 *addr, const u32 *range,
54 int na, int ns, int pna);
55 int (*translate)(u32 *addr, u64 offset, int na);
56 unsigned int (*get_flags)(const u32 *addr);
57};
58
59
60/*
61 * Default translator (generic bus)
62 */
63
64static void of_bus_default_count_cells(struct device_node *dev,
65 int *addrc, int *sizec)
66{
67 if (addrc)
68 *addrc = of_n_addr_cells(dev);
69 if (sizec)
70 *sizec = of_n_size_cells(dev);
71}
72
73static u64 of_bus_default_map(u32 *addr, const u32 *range,
74 int na, int ns, int pna)
75{
76 u64 cp, s, da;
77
78 cp = of_read_number(range, na);
79 s = of_read_number(range + na + pna, ns);
80 da = of_read_number(addr, na);
81
82 DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
83 cp, s, da);
84
85 if (da < cp || da >= (cp + s))
86 return OF_BAD_ADDR;
87 return da - cp;
88}
89
90static int of_bus_default_translate(u32 *addr, u64 offset, int na)
91{
92 u64 a = of_read_number(addr, na);
93 memset(addr, 0, na * 4);
94 a += offset;
95 if (na > 1)
96 addr[na - 2] = a >> 32;
97 addr[na - 1] = a & 0xffffffffu;
98
99 return 0;
100}
101
102static unsigned int of_bus_default_get_flags(const u32 *addr)
103{
104 return IORESOURCE_MEM;
105}
106
107
108#ifdef CONFIG_PCI 13#ifdef CONFIG_PCI
109/*
110 * PCI bus specific translator
111 */
112
113static int of_bus_pci_match(struct device_node *np)
114{
115 /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
116 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
117}
118
119static void of_bus_pci_count_cells(struct device_node *np,
120 int *addrc, int *sizec)
121{
122 if (addrc)
123 *addrc = 3;
124 if (sizec)
125 *sizec = 2;
126}
127
128static unsigned int of_bus_pci_get_flags(const u32 *addr)
129{
130 unsigned int flags = 0;
131 u32 w = addr[0];
132
133 switch((w >> 24) & 0x03) {
134 case 0x01:
135 flags |= IORESOURCE_IO;
136 break;
137 case 0x02: /* 32 bits */
138 case 0x03: /* 64 bits */
139 flags |= IORESOURCE_MEM;
140 break;
141 }
142 if (w & 0x40000000)
143 flags |= IORESOURCE_PREFETCH;
144 return flags;
145}
146
147static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
148{
149 u64 cp, s, da;
150 unsigned int af, rf;
151
152 af = of_bus_pci_get_flags(addr);
153 rf = of_bus_pci_get_flags(range);
154
155 /* Check address type match */
156 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
157 return OF_BAD_ADDR;
158
159 /* Read address values, skipping high cell */
160 cp = of_read_number(range + 1, na - 1);
161 s = of_read_number(range + na + pna, ns);
162 da = of_read_number(addr + 1, na - 1);
163
164 DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
165
166 if (da < cp || da >= (cp + s))
167 return OF_BAD_ADDR;
168 return da - cp;
169}
170
171static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
172{
173 return of_bus_default_translate(addr + 1, offset, na - 1);
174}
175
176const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
177 unsigned int *flags)
178{
179 const u32 *prop;
180 unsigned int psize;
181 struct device_node *parent;
182 struct of_bus *bus;
183 int onesize, i, na, ns;
184
185 /* Get parent & match bus type */
186 parent = of_get_parent(dev);
187 if (parent == NULL)
188 return NULL;
189 bus = of_match_bus(parent);
190 if (strcmp(bus->name, "pci")) {
191 of_node_put(parent);
192 return NULL;
193 }
194 bus->count_cells(dev, &na, &ns);
195 of_node_put(parent);
196 if (!OF_CHECK_COUNTS(na, ns))
197 return NULL;
198
199 /* Get "reg" or "assigned-addresses" property */
200 prop = of_get_property(dev, bus->addresses, &psize);
201 if (prop == NULL)
202 return NULL;
203 psize /= 4;
204
205 onesize = na + ns;
206 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
207 if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
208 if (size)
209 *size = of_read_number(prop + na, ns);
210 if (flags)
211 *flags = bus->get_flags(prop);
212 return prop;
213 }
214 return NULL;
215}
216EXPORT_SYMBOL(of_get_pci_address);
217
218int of_pci_address_to_resource(struct device_node *dev, int bar,
219 struct resource *r)
220{
221 const u32 *addrp;
222 u64 size;
223 unsigned int flags;
224
225 addrp = of_get_pci_address(dev, bar, &size, &flags);
226 if (addrp == NULL)
227 return -EINVAL;
228 return __of_address_to_resource(dev, addrp, size, flags, r);
229}
230EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
231
232int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq) 14int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
233{ 15{
234 struct device_node *dn, *ppnode; 16 struct device_node *dn, *ppnode;
@@ -310,303 +92,6 @@ int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
310EXPORT_SYMBOL_GPL(of_irq_map_pci); 92EXPORT_SYMBOL_GPL(of_irq_map_pci);
311#endif /* CONFIG_PCI */ 93#endif /* CONFIG_PCI */
312 94
313/*
314 * ISA bus specific translator
315 */
316
317static int of_bus_isa_match(struct device_node *np)
318{
319 return !strcmp(np->name, "isa");
320}
321
322static void of_bus_isa_count_cells(struct device_node *child,
323 int *addrc, int *sizec)
324{
325 if (addrc)
326 *addrc = 2;
327 if (sizec)
328 *sizec = 1;
329}
330
331static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
332{
333 u64 cp, s, da;
334
335 /* Check address type match */
336 if ((addr[0] ^ range[0]) & 0x00000001)
337 return OF_BAD_ADDR;
338
339 /* Read address values, skipping high cell */
340 cp = of_read_number(range + 1, na - 1);
341 s = of_read_number(range + na + pna, ns);
342 da = of_read_number(addr + 1, na - 1);
343
344 DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
345
346 if (da < cp || da >= (cp + s))
347 return OF_BAD_ADDR;
348 return da - cp;
349}
350
351static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
352{
353 return of_bus_default_translate(addr + 1, offset, na - 1);
354}
355
356static unsigned int of_bus_isa_get_flags(const u32 *addr)
357{
358 unsigned int flags = 0;
359 u32 w = addr[0];
360
361 if (w & 1)
362 flags |= IORESOURCE_IO;
363 else
364 flags |= IORESOURCE_MEM;
365 return flags;
366}
367
368
369/*
370 * Array of bus specific translators
371 */
372
373static struct of_bus of_busses[] = {
374#ifdef CONFIG_PCI
375 /* PCI */
376 {
377 .name = "pci",
378 .addresses = "assigned-addresses",
379 .match = of_bus_pci_match,
380 .count_cells = of_bus_pci_count_cells,
381 .map = of_bus_pci_map,
382 .translate = of_bus_pci_translate,
383 .get_flags = of_bus_pci_get_flags,
384 },
385#endif /* CONFIG_PCI */
386 /* ISA */
387 {
388 .name = "isa",
389 .addresses = "reg",
390 .match = of_bus_isa_match,
391 .count_cells = of_bus_isa_count_cells,
392 .map = of_bus_isa_map,
393 .translate = of_bus_isa_translate,
394 .get_flags = of_bus_isa_get_flags,
395 },
396 /* Default */
397 {
398 .name = "default",
399 .addresses = "reg",
400 .match = NULL,
401 .count_cells = of_bus_default_count_cells,
402 .map = of_bus_default_map,
403 .translate = of_bus_default_translate,
404 .get_flags = of_bus_default_get_flags,
405 },
406};
407
408static struct of_bus *of_match_bus(struct device_node *np)
409{
410 int i;
411
412 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
413 if (!of_busses[i].match || of_busses[i].match(np))
414 return &of_busses[i];
415 BUG();
416 return NULL;
417}
418
419static int of_translate_one(struct device_node *parent, struct of_bus *bus,
420 struct of_bus *pbus, u32 *addr,
421 int na, int ns, int pna, const char *rprop)
422{
423 const u32 *ranges;
424 unsigned int rlen;
425 int rone;
426 u64 offset = OF_BAD_ADDR;
427
428 /* Normally, an absence of a "ranges" property means we are
429 * crossing a non-translatable boundary, and thus the addresses
430 * below the current not cannot be converted to CPU physical ones.
431 * Unfortunately, while this is very clear in the spec, it's not
432 * what Apple understood, and they do have things like /uni-n or
433 * /ht nodes with no "ranges" property and a lot of perfectly
434 * useable mapped devices below them. Thus we treat the absence of
435 * "ranges" as equivalent to an empty "ranges" property which means
436 * a 1:1 translation at that level. It's up to the caller not to try
437 * to translate addresses that aren't supposed to be translated in
438 * the first place. --BenH.
439 */
440 ranges = of_get_property(parent, rprop, &rlen);
441 if (ranges == NULL || rlen == 0) {
442 offset = of_read_number(addr, na);
443 memset(addr, 0, pna * 4);
444 DBG("OF: no ranges, 1:1 translation\n");
445 goto finish;
446 }
447
448 DBG("OF: walking ranges...\n");
449
450 /* Now walk through the ranges */
451 rlen /= 4;
452 rone = na + pna + ns;
453 for (; rlen >= rone; rlen -= rone, ranges += rone) {
454 offset = bus->map(addr, ranges, na, ns, pna);
455 if (offset != OF_BAD_ADDR)
456 break;
457 }
458 if (offset == OF_BAD_ADDR) {
459 DBG("OF: not found !\n");
460 return 1;
461 }
462 memcpy(addr, ranges + na, 4 * pna);
463
464 finish:
465 of_dump_addr("OF: parent translation for:", addr, pna);
466 DBG("OF: with offset: "PRu64"\n", offset);
467
468 /* Translate it into parent bus space */
469 return pbus->translate(addr, offset, pna);
470}
471
472
473/*
474 * Translate an address from the device-tree into a CPU physical address,
475 * this walks up the tree and applies the various bus mappings on the
476 * way.
477 *
478 * Note: We consider that crossing any level with #size-cells == 0 to mean
479 * that translation is impossible (that is we are not dealing with a value
480 * that can be mapped to a cpu physical address). This is not really specified
481 * that way, but this is traditionally the way IBM at least do things
482 */
483u64 __of_translate_address(struct device_node *dev, const u32 *in_addr,
484 const char *rprop)
485{
486 struct device_node *parent = NULL;
487 struct of_bus *bus, *pbus;
488 u32 addr[OF_MAX_ADDR_CELLS];
489 int na, ns, pna, pns;
490 u64 result = OF_BAD_ADDR;
491
492 DBG("OF: ** translation for device %s **\n", dev->full_name);
493
494 /* Increase refcount at current level */
495 of_node_get(dev);
496
497 /* Get parent & match bus type */
498 parent = of_get_parent(dev);
499 if (parent == NULL)
500 goto bail;
501 bus = of_match_bus(parent);
502
503 /* Cound address cells & copy address locally */
504 bus->count_cells(dev, &na, &ns);
505 if (!OF_CHECK_COUNTS(na, ns)) {
506 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
507 dev->full_name);
508 goto bail;
509 }
510 memcpy(addr, in_addr, na * 4);
511
512 DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
513 bus->name, na, ns, parent->full_name);
514 of_dump_addr("OF: translating address:", addr, na);
515
516 /* Translate */
517 for (;;) {
518 /* Switch to parent bus */
519 of_node_put(dev);
520 dev = parent;
521 parent = of_get_parent(dev);
522
523 /* If root, we have finished */
524 if (parent == NULL) {
525 DBG("OF: reached root node\n");
526 result = of_read_number(addr, na);
527 break;
528 }
529
530 /* Get new parent bus and counts */
531 pbus = of_match_bus(parent);
532 pbus->count_cells(dev, &pna, &pns);
533 if (!OF_CHECK_COUNTS(pna, pns)) {
534 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
535 dev->full_name);
536 break;
537 }
538
539 DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
540 pbus->name, pna, pns, parent->full_name);
541
542 /* Apply bus translation */
543 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
544 break;
545
546 /* Complete the move up one level */
547 na = pna;
548 ns = pns;
549 bus = pbus;
550
551 of_dump_addr("OF: one level translation:", addr, na);
552 }
553 bail:
554 of_node_put(parent);
555 of_node_put(dev);
556
557 return result;
558}
559
560u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
561{
562 return __of_translate_address(dev, in_addr, "ranges");
563}
564EXPORT_SYMBOL(of_translate_address);
565
566u64 of_translate_dma_address(struct device_node *dev, const u32 *in_addr)
567{
568 return __of_translate_address(dev, in_addr, "dma-ranges");
569}
570EXPORT_SYMBOL(of_translate_dma_address);
571
572const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
573 unsigned int *flags)
574{
575 const u32 *prop;
576 unsigned int psize;
577 struct device_node *parent;
578 struct of_bus *bus;
579 int onesize, i, na, ns;
580
581 /* Get parent & match bus type */
582 parent = of_get_parent(dev);
583 if (parent == NULL)
584 return NULL;
585 bus = of_match_bus(parent);
586 bus->count_cells(dev, &na, &ns);
587 of_node_put(parent);
588 if (!OF_CHECK_COUNTS(na, ns))
589 return NULL;
590
591 /* Get "reg" or "assigned-addresses" property */
592 prop = of_get_property(dev, bus->addresses, &psize);
593 if (prop == NULL)
594 return NULL;
595 psize /= 4;
596
597 onesize = na + ns;
598 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
599 if (i == index) {
600 if (size)
601 *size = of_read_number(prop + na, ns);
602 if (flags)
603 *flags = bus->get_flags(prop);
604 return prop;
605 }
606 return NULL;
607}
608EXPORT_SYMBOL(of_get_address);
609
610void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop, 95void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
611 unsigned long *busno, unsigned long *phys, unsigned long *size) 96 unsigned long *busno, unsigned long *phys, unsigned long *size)
612{ 97{
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