3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/pci_regs.h>
6 #include <linux/module.h>
7 #include <linux/ioport.h>
8 #include <linux/etherdevice.h>
9 #include <linux/of_address.h>
11 #include <asm/pci-bridge.h>
14 #define DBG(fmt...) do { printk(fmt); } while(0)
16 #define DBG(fmt...) do { } while(0)
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 && \
30 static struct of_bus *of_match_bus(struct device_node *np);
34 static void of_dump_addr(const char *s, const u32 *addr, int na)
38 printk(" %08x", *(addr++));
42 static void of_dump_addr(const char *s, const u32 *addr, int na) { }
46 /* Callbacks for bus specific translators */
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);
61 * Default translator (generic bus)
64 static void of_bus_default_count_cells(struct device_node *dev,
65 int *addrc, int *sizec)
68 *addrc = of_n_addr_cells(dev);
70 *sizec = of_n_size_cells(dev);
73 static u64 of_bus_default_map(u32 *addr, const u32 *range,
74 int na, int ns, int pna)
78 cp = of_read_number(range, na);
79 s = of_read_number(range + na + pna, ns);
80 da = of_read_number(addr, na);
82 DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
85 if (da < cp || da >= (cp + s))
90 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
92 u64 a = of_read_number(addr, na);
93 memset(addr, 0, na * 4);
96 addr[na - 2] = a >> 32;
97 addr[na - 1] = a & 0xffffffffu;
102 static unsigned int of_bus_default_get_flags(const u32 *addr)
104 return IORESOURCE_MEM;
110 * PCI bus specific translator
113 static int of_bus_pci_match(struct device_node *np)
115 /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
116 return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
119 static void of_bus_pci_count_cells(struct device_node *np,
120 int *addrc, int *sizec)
128 static unsigned int of_bus_pci_get_flags(const u32 *addr)
130 unsigned int flags = 0;
133 switch((w >> 24) & 0x03) {
135 flags |= IORESOURCE_IO;
137 case 0x02: /* 32 bits */
138 case 0x03: /* 64 bits */
139 flags |= IORESOURCE_MEM;
143 flags |= IORESOURCE_PREFETCH;
147 static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
152 af = of_bus_pci_get_flags(addr);
153 rf = of_bus_pci_get_flags(range);
155 /* Check address type match */
156 if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
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);
164 DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
166 if (da < cp || da >= (cp + s))
171 static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
173 return of_bus_default_translate(addr + 1, offset, na - 1);
176 const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
181 struct device_node *parent;
183 int onesize, i, na, ns;
185 /* Get parent & match bus type */
186 parent = of_get_parent(dev);
189 bus = of_match_bus(parent);
190 if (strcmp(bus->name, "pci")) {
194 bus->count_cells(dev, &na, &ns);
196 if (!OF_CHECK_COUNTS(na, ns))
199 /* Get "reg" or "assigned-addresses" property */
200 prop = of_get_property(dev, bus->addresses, &psize);
206 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
207 if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
209 *size = of_read_number(prop + na, ns);
211 *flags = bus->get_flags(prop);
216 EXPORT_SYMBOL(of_get_pci_address);
218 int of_pci_address_to_resource(struct device_node *dev, int bar,
225 addrp = of_get_pci_address(dev, bar, &size, &flags);
228 return __of_address_to_resource(dev, addrp, size, flags, r);
230 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
232 int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
234 struct device_node *dn, *ppnode;
235 struct pci_dev *ppdev;
241 /* Check if we have a device node, if yes, fallback to standard OF
244 dn = pci_device_to_OF_node(pdev);
246 rc = of_irq_map_one(dn, 0, out_irq);
251 /* Ok, we don't, time to have fun. Let's start by building up an
252 * interrupt spec. we assume #interrupt-cells is 1, which is standard
253 * for PCI. If you do different, then don't use that routine.
255 rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
262 /* Now we walk up the PCI tree */
265 /* Get the pci_dev of our parent */
266 ppdev = pdev->bus->self;
268 /* Ouch, it's a host bridge... */
271 ppnode = pci_bus_to_OF_node(pdev->bus);
273 struct pci_controller *host;
274 host = pci_bus_to_host(pdev->bus);
275 ppnode = host ? host->dn : NULL;
277 /* No node for host bridge ? give up */
281 /* We found a P2P bridge, check if it has a node */
282 ppnode = pci_device_to_OF_node(ppdev);
284 /* Ok, we have found a parent with a device-node, hand over to
285 * the OF parsing code.
286 * We build a unit address from the linux device to be used for
287 * resolution. Note that we use the linux bus number which may
288 * not match your firmware bus numbering.
289 * Fortunately, in most cases, interrupt-map-mask doesn't include
290 * the bus number as part of the matching.
291 * You should still be careful about that though if you intend
292 * to rely on this function (you ship a firmware that doesn't
293 * create device nodes for all PCI devices).
298 /* We can only get here if we hit a P2P bridge with no node,
299 * let's do standard swizzling and try again
301 lspec = pci_swizzle_interrupt_pin(pdev, lspec);
305 laddr[0] = (pdev->bus->number << 16)
306 | (pdev->devfn << 8);
307 laddr[1] = laddr[2] = 0;
308 return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
310 EXPORT_SYMBOL_GPL(of_irq_map_pci);
311 #endif /* CONFIG_PCI */
314 * ISA bus specific translator
317 static int of_bus_isa_match(struct device_node *np)
319 return !strcmp(np->name, "isa");
322 static void of_bus_isa_count_cells(struct device_node *child,
323 int *addrc, int *sizec)
331 static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
335 /* Check address type match */
336 if ((addr[0] ^ range[0]) & 0x00000001)
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);
344 DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
346 if (da < cp || da >= (cp + s))
351 static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
353 return of_bus_default_translate(addr + 1, offset, na - 1);
356 static unsigned int of_bus_isa_get_flags(const u32 *addr)
358 unsigned int flags = 0;
362 flags |= IORESOURCE_IO;
364 flags |= IORESOURCE_MEM;
370 * Array of bus specific translators
373 static struct of_bus of_busses[] = {
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,
385 #endif /* CONFIG_PCI */
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,
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,
408 static struct of_bus *of_match_bus(struct device_node *np)
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];
419 static 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)
426 u64 offset = OF_BAD_ADDR;
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.
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");
448 DBG("OF: walking ranges...\n");
450 /* Now walk through the ranges */
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)
458 if (offset == OF_BAD_ADDR) {
459 DBG("OF: not found !\n");
462 memcpy(addr, ranges + na, 4 * pna);
465 of_dump_addr("OF: parent translation for:", addr, pna);
466 DBG("OF: with offset: "PRu64"\n", offset);
468 /* Translate it into parent bus space */
469 return pbus->translate(addr, offset, pna);
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
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
483 u64 __of_translate_address(struct device_node *dev, const u32 *in_addr,
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;
492 DBG("OF: ** translation for device %s **\n", dev->full_name);
494 /* Increase refcount at current level */
497 /* Get parent & match bus type */
498 parent = of_get_parent(dev);
501 bus = of_match_bus(parent);
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",
510 memcpy(addr, in_addr, na * 4);
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);
518 /* Switch to parent bus */
521 parent = of_get_parent(dev);
523 /* If root, we have finished */
524 if (parent == NULL) {
525 DBG("OF: reached root node\n");
526 result = of_read_number(addr, na);
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",
539 DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
540 pbus->name, pna, pns, parent->full_name);
542 /* Apply bus translation */
543 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
546 /* Complete the move up one level */
551 of_dump_addr("OF: one level translation:", addr, na);
560 u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
562 return __of_translate_address(dev, in_addr, "ranges");
564 EXPORT_SYMBOL(of_translate_address);
566 u64 of_translate_dma_address(struct device_node *dev, const u32 *in_addr)
568 return __of_translate_address(dev, in_addr, "dma-ranges");
570 EXPORT_SYMBOL(of_translate_dma_address);
572 const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
577 struct device_node *parent;
579 int onesize, i, na, ns;
581 /* Get parent & match bus type */
582 parent = of_get_parent(dev);
585 bus = of_match_bus(parent);
586 bus->count_cells(dev, &na, &ns);
588 if (!OF_CHECK_COUNTS(na, ns))
591 /* Get "reg" or "assigned-addresses" property */
592 prop = of_get_property(dev, bus->addresses, &psize);
598 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
601 *size = of_read_number(prop + na, ns);
603 *flags = bus->get_flags(prop);
608 EXPORT_SYMBOL(of_get_address);
610 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
611 unsigned long *busno, unsigned long *phys, unsigned long *size)
613 const u32 *dma_window;
615 const unsigned char *prop;
617 dma_window = dma_window_prop;
619 /* busno is always one cell */
620 *busno = *(dma_window++);
622 prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
624 prop = of_get_property(dn, "#address-cells", NULL);
626 cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
627 *phys = of_read_number(dma_window, cells);
631 prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
632 cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
633 *size = of_read_number(dma_window, cells);
637 * Search the device tree for the best MAC address to use. 'mac-address' is
638 * checked first, because that is supposed to contain to "most recent" MAC
639 * address. If that isn't set, then 'local-mac-address' is checked next,
640 * because that is the default address. If that isn't set, then the obsolete
641 * 'address' is checked, just in case we're using an old device tree.
643 * Note that the 'address' property is supposed to contain a virtual address of
644 * the register set, but some DTS files have redefined that property to be the
647 * All-zero MAC addresses are rejected, because those could be properties that
648 * exist in the device tree, but were not set by U-Boot. For example, the
649 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
650 * addresses. Some older U-Boots only initialized 'local-mac-address'. In
651 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
654 const void *of_get_mac_address(struct device_node *np)
658 pp = of_find_property(np, "mac-address", NULL);
659 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
662 pp = of_find_property(np, "local-mac-address", NULL);
663 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
666 pp = of_find_property(np, "address", NULL);
667 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
672 EXPORT_SYMBOL(of_get_mac_address);