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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/microblaze/kernel
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/microblaze/kernel')
-rw-r--r--arch/microblaze/kernel/prom_parse.c489
1 files changed, 0 insertions, 489 deletions
diff --git a/arch/microblaze/kernel/prom_parse.c b/arch/microblaze/kernel/prom_parse.c
index 2f9cdd26ca12..d33ba17601fa 100644
--- a/arch/microblaze/kernel/prom_parse.c
+++ b/arch/microblaze/kernel/prom_parse.c
@@ -10,213 +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#define PRu64 "%llx"
14
15/* Max address size we deal with */
16#define OF_MAX_ADDR_CELLS 4
17#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
18 (ns) > 0)
19
20static struct of_bus *of_match_bus(struct device_node *np);
21
22/* Debug utility */
23#ifdef DEBUG
24static void of_dump_addr(const char *s, const u32 *addr, int na)
25{
26 printk(KERN_INFO "%s", s);
27 while (na--)
28 printk(KERN_INFO " %08x", *(addr++));
29 printk(KERN_INFO "\n");
30}
31#else
32static void of_dump_addr(const char *s, const u32 *addr, int na) { }
33#endif
34
35/* Callbacks for bus specific translators */
36struct of_bus {
37 const char *name;
38 const char *addresses;
39 int (*match)(struct device_node *parent);
40 void (*count_cells)(struct device_node *child,
41 int *addrc, int *sizec);
42 u64 (*map)(u32 *addr, const u32 *range,
43 int na, int ns, int pna);
44 int (*translate)(u32 *addr, u64 offset, int na);
45 unsigned int (*get_flags)(const u32 *addr);
46};
47
48/*
49 * Default translator (generic bus)
50 */
51
52static void of_bus_default_count_cells(struct device_node *dev,
53 int *addrc, int *sizec)
54{
55 if (addrc)
56 *addrc = of_n_addr_cells(dev);
57 if (sizec)
58 *sizec = of_n_size_cells(dev);
59}
60
61static u64 of_bus_default_map(u32 *addr, const u32 *range,
62 int na, int ns, int pna)
63{
64 u64 cp, s, da;
65
66 cp = of_read_number(range, na);
67 s = of_read_number(range + na + pna, ns);
68 da = of_read_number(addr, na);
69
70 pr_debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
71 cp, s, da);
72
73 if (da < cp || da >= (cp + s))
74 return OF_BAD_ADDR;
75 return da - cp;
76}
77
78static int of_bus_default_translate(u32 *addr, u64 offset, int na)
79{
80 u64 a = of_read_number(addr, na);
81 memset(addr, 0, na * 4);
82 a += offset;
83 if (na > 1)
84 addr[na - 2] = a >> 32;
85 addr[na - 1] = a & 0xffffffffu;
86
87 return 0;
88}
89
90static unsigned int of_bus_default_get_flags(const u32 *addr)
91{
92 return IORESOURCE_MEM;
93}
94
95#ifdef CONFIG_PCI 13#ifdef CONFIG_PCI
96/*
97 * PCI bus specific translator
98 */
99
100static int of_bus_pci_match(struct device_node *np)
101{
102 /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
103 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
104}
105
106static void of_bus_pci_count_cells(struct device_node *np,
107 int *addrc, int *sizec)
108{
109 if (addrc)
110 *addrc = 3;
111 if (sizec)
112 *sizec = 2;
113}
114
115static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
116{
117 u64 cp, s, da;
118
119 /* Check address type match */
120 if ((addr[0] ^ range[0]) & 0x03000000)
121 return OF_BAD_ADDR;
122
123 /* Read address values, skipping high cell */
124 cp = of_read_number(range + 1, na - 1);
125 s = of_read_number(range + na + pna, ns);
126 da = of_read_number(addr + 1, na - 1);
127
128 pr_debug("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
129
130 if (da < cp || da >= (cp + s))
131 return OF_BAD_ADDR;
132 return da - cp;
133}
134
135static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
136{
137 return of_bus_default_translate(addr + 1, offset, na - 1);
138}
139
140static unsigned int of_bus_pci_get_flags(const u32 *addr)
141{
142 unsigned int flags = 0;
143 u32 w = addr[0];
144
145 switch ((w >> 24) & 0x03) {
146 case 0x01:
147 flags |= IORESOURCE_IO;
148 break;
149 case 0x02: /* 32 bits */
150 case 0x03: /* 64 bits */
151 flags |= IORESOURCE_MEM;
152 break;
153 }
154 if (w & 0x40000000)
155 flags |= IORESOURCE_PREFETCH;
156 return flags;
157}
158
159const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
160 unsigned int *flags)
161{
162 const u32 *prop;
163 unsigned int psize;
164 struct device_node *parent;
165 struct of_bus *bus;
166 int onesize, i, na, ns;
167
168 /* Get parent & match bus type */
169 parent = of_get_parent(dev);
170 if (parent == NULL)
171 return NULL;
172 bus = of_match_bus(parent);
173 if (strcmp(bus->name, "pci")) {
174 of_node_put(parent);
175 return NULL;
176 }
177 bus->count_cells(dev, &na, &ns);
178 of_node_put(parent);
179 if (!OF_CHECK_COUNTS(na, ns))
180 return NULL;
181
182 /* Get "reg" or "assigned-addresses" property */
183 prop = of_get_property(dev, bus->addresses, &psize);
184 if (prop == NULL)
185 return NULL;
186 psize /= 4;
187
188 onesize = na + ns;
189 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
190 if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
191 if (size)
192 *size = of_read_number(prop + na, ns);
193 if (flags)
194 *flags = bus->get_flags(prop);
195 return prop;
196 }
197 return NULL;
198}
199EXPORT_SYMBOL(of_get_pci_address);
200
201int of_pci_address_to_resource(struct device_node *dev, int bar,
202 struct resource *r)
203{
204 const u32 *addrp;
205 u64 size;
206 unsigned int flags;
207
208 addrp = of_get_pci_address(dev, bar, &size, &flags);
209 if (addrp == NULL)
210 return -EINVAL;
211 return __of_address_to_resource(dev, addrp, size, flags, r);
212}
213EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
214
215static u8 of_irq_pci_swizzle(u8 slot, u8 pin)
216{
217 return (((pin - 1) + slot) % 4) + 1;
218}
219
220int 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)
221{ 15{
222 struct device_node *dn, *ppnode; 16 struct device_node *dn, *ppnode;
@@ -291,289 +85,6 @@ int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
291EXPORT_SYMBOL_GPL(of_irq_map_pci); 85EXPORT_SYMBOL_GPL(of_irq_map_pci);
292#endif /* CONFIG_PCI */ 86#endif /* CONFIG_PCI */
293 87
294/*
295 * ISA bus specific translator
296 */
297
298static int of_bus_isa_match(struct device_node *np)
299{
300 return !strcmp(np->name, "isa");
301}
302
303static void of_bus_isa_count_cells(struct device_node *child,
304 int *addrc, int *sizec)
305{
306 if (addrc)
307 *addrc = 2;
308 if (sizec)
309 *sizec = 1;
310}
311
312static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
313{
314 u64 cp, s, da;
315
316 /* Check address type match */
317 if ((addr[0] ^ range[0]) & 0x00000001)
318 return OF_BAD_ADDR;
319
320 /* Read address values, skipping high cell */
321 cp = of_read_number(range + 1, na - 1);
322 s = of_read_number(range + na + pna, ns);
323 da = of_read_number(addr + 1, na - 1);
324
325 pr_debug("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
326
327 if (da < cp || da >= (cp + s))
328 return OF_BAD_ADDR;
329 return da - cp;
330}
331
332static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
333{
334 return of_bus_default_translate(addr + 1, offset, na - 1);
335}
336
337static unsigned int of_bus_isa_get_flags(const u32 *addr)
338{
339 unsigned int flags = 0;
340 u32 w = addr[0];
341
342 if (w & 1)
343 flags |= IORESOURCE_IO;
344 else
345 flags |= IORESOURCE_MEM;
346 return flags;
347}
348
349/*
350 * Array of bus specific translators
351 */
352
353static struct of_bus of_busses[] = {
354#ifdef CONFIG_PCI
355 /* PCI */
356 {
357 .name = "pci",
358 .addresses = "assigned-addresses",
359 .match = of_bus_pci_match,
360 .count_cells = of_bus_pci_count_cells,
361 .map = of_bus_pci_map,
362 .translate = of_bus_pci_translate,
363 .get_flags = of_bus_pci_get_flags,
364 },
365#endif /* CONFIG_PCI */
366 /* ISA */
367 {
368 .name = "isa",
369 .addresses = "reg",
370 .match = of_bus_isa_match,
371 .count_cells = of_bus_isa_count_cells,
372 .map = of_bus_isa_map,
373 .translate = of_bus_isa_translate,
374 .get_flags = of_bus_isa_get_flags,
375 },
376 /* Default */
377 {
378 .name = "default",
379 .addresses = "reg",
380 .match = NULL,
381 .count_cells = of_bus_default_count_cells,
382 .map = of_bus_default_map,
383 .translate = of_bus_default_translate,
384 .get_flags = of_bus_default_get_flags,
385 },
386};
387
388static struct of_bus *of_match_bus(struct device_node *np)
389{
390 int i;
391
392 for (i = 0; i < ARRAY_SIZE(of_busses); i++)
393 if (!of_busses[i].match || of_busses[i].match(np))
394 return &of_busses[i];
395 BUG();
396 return NULL;
397}
398
399static int of_translate_one(struct device_node *parent, struct of_bus *bus,
400 struct of_bus *pbus, u32 *addr,
401 int na, int ns, int pna)
402{
403 const u32 *ranges;
404 unsigned int rlen;
405 int rone;
406 u64 offset = OF_BAD_ADDR;
407
408 /* Normally, an absence of a "ranges" property means we are
409 * crossing a non-translatable boundary, and thus the addresses
410 * below the current not cannot be converted to CPU physical ones.
411 * Unfortunately, while this is very clear in the spec, it's not
412 * what Apple understood, and they do have things like /uni-n or
413 * /ht nodes with no "ranges" property and a lot of perfectly
414 * useable mapped devices below them. Thus we treat the absence of
415 * "ranges" as equivalent to an empty "ranges" property which means
416 * a 1:1 translation at that level. It's up to the caller not to try
417 * to translate addresses that aren't supposed to be translated in
418 * the first place. --BenH.
419 */
420 ranges = of_get_property(parent, "ranges", (int *) &rlen);
421 if (ranges == NULL || rlen == 0) {
422 offset = of_read_number(addr, na);
423 memset(addr, 0, pna * 4);
424 pr_debug("OF: no ranges, 1:1 translation\n");
425 goto finish;
426 }
427
428 pr_debug("OF: walking ranges...\n");
429
430 /* Now walk through the ranges */
431 rlen /= 4;
432 rone = na + pna + ns;
433 for (; rlen >= rone; rlen -= rone, ranges += rone) {
434 offset = bus->map(addr, ranges, na, ns, pna);
435 if (offset != OF_BAD_ADDR)
436 break;
437 }
438 if (offset == OF_BAD_ADDR) {
439 pr_debug("OF: not found !\n");
440 return 1;
441 }
442 memcpy(addr, ranges + na, 4 * pna);
443
444 finish:
445 of_dump_addr("OF: parent translation for:", addr, pna);
446 pr_debug("OF: with offset: "PRu64"\n", offset);
447
448 /* Translate it into parent bus space */
449 return pbus->translate(addr, offset, pna);
450}
451
452/*
453 * Translate an address from the device-tree into a CPU physical address,
454 * this walks up the tree and applies the various bus mappings on the
455 * way.
456 *
457 * Note: We consider that crossing any level with #size-cells == 0 to mean
458 * that translation is impossible (that is we are not dealing with a value
459 * that can be mapped to a cpu physical address). This is not really specified
460 * that way, but this is traditionally the way IBM at least do things
461 */
462u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
463{
464 struct device_node *parent = NULL;
465 struct of_bus *bus, *pbus;
466 u32 addr[OF_MAX_ADDR_CELLS];
467 int na, ns, pna, pns;
468 u64 result = OF_BAD_ADDR;
469
470 pr_debug("OF: ** translation for device %s **\n", dev->full_name);
471
472 /* Increase refcount at current level */
473 of_node_get(dev);
474
475 /* Get parent & match bus type */
476 parent = of_get_parent(dev);
477 if (parent == NULL)
478 goto bail;
479 bus = of_match_bus(parent);
480
481 /* Cound address cells & copy address locally */
482 bus->count_cells(dev, &na, &ns);
483 if (!OF_CHECK_COUNTS(na, ns)) {
484 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
485 dev->full_name);
486 goto bail;
487 }
488 memcpy(addr, in_addr, na * 4);
489
490 pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
491 bus->name, na, ns, parent->full_name);
492 of_dump_addr("OF: translating address:", addr, na);
493
494 /* Translate */
495 for (;;) {
496 /* Switch to parent bus */
497 of_node_put(dev);
498 dev = parent;
499 parent = of_get_parent(dev);
500
501 /* If root, we have finished */
502 if (parent == NULL) {
503 pr_debug("OF: reached root node\n");
504 result = of_read_number(addr, na);
505 break;
506 }
507
508 /* Get new parent bus and counts */
509 pbus = of_match_bus(parent);
510 pbus->count_cells(dev, &pna, &pns);
511 if (!OF_CHECK_COUNTS(pna, pns)) {
512 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
513 dev->full_name);
514 break;
515 }
516
517 pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
518 pbus->name, pna, pns, parent->full_name);
519
520 /* Apply bus translation */
521 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
522 break;
523
524 /* Complete the move up one level */
525 na = pna;
526 ns = pns;
527 bus = pbus;
528
529 of_dump_addr("OF: one level translation:", addr, na);
530 }
531 bail:
532 of_node_put(parent);
533 of_node_put(dev);
534
535 return result;
536}
537EXPORT_SYMBOL(of_translate_address);
538
539const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
540 unsigned int *flags)
541{
542 const u32 *prop;
543 unsigned int psize;
544 struct device_node *parent;
545 struct of_bus *bus;
546 int onesize, i, na, ns;
547
548 /* Get parent & match bus type */
549 parent = of_get_parent(dev);
550 if (parent == NULL)
551 return NULL;
552 bus = of_match_bus(parent);
553 bus->count_cells(dev, &na, &ns);
554 of_node_put(parent);
555 if (!OF_CHECK_COUNTS(na, ns))
556 return NULL;
557
558 /* Get "reg" or "assigned-addresses" property */
559 prop = of_get_property(dev, bus->addresses, (int *) &psize);
560 if (prop == NULL)
561 return NULL;
562 psize /= 4;
563
564 onesize = na + ns;
565 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
566 if (i == index) {
567 if (size)
568 *size = of_read_number(prop + na, ns);
569 if (flags)
570 *flags = bus->get_flags(prop);
571 return prop;
572 }
573 return NULL;
574}
575EXPORT_SYMBOL(of_get_address);
576
577void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop, 88void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
578 unsigned long *busno, unsigned long *phys, unsigned long *size) 89 unsigned long *busno, unsigned long *phys, unsigned long *size)
579{ 90{
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