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>
9 #include <asm/pci-bridge.h>
12 #define DBG(fmt...) do { printk(fmt); } while(0)
14 #define DBG(fmt...) do { } while(0)
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 && \
30 static void of_dump_addr(const char *s, u32 *addr, int na)
34 printk(" %08x", *(addr++));
38 static void of_dump_addr(const char *s, u32 *addr, int na) { }
41 /* Read a big address */
42 static inline u64 of_read_addr(u32 *cell, int size)
46 r = (r << 32) | *(cell++);
50 /* Callbacks for bus specific translators */
53 const char *addresses;
54 int (*match)(struct device_node *parent);
55 void (*count_cells)(struct device_node *child,
56 int *addrc, int *sizec);
57 u64 (*map)(u32 *addr, u32 *range, int na, int ns, int pna);
58 int (*translate)(u32 *addr, u64 offset, int na);
59 unsigned int (*get_flags)(u32 *addr);
64 * Default translator (generic bus)
67 static void of_bus_default_count_cells(struct device_node *dev,
68 int *addrc, int *sizec)
71 *addrc = prom_n_addr_cells(dev);
73 *sizec = prom_n_size_cells(dev);
76 static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
80 cp = of_read_addr(range, na);
81 s = of_read_addr(range + na + pna, ns);
82 da = of_read_addr(addr, na);
84 DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
87 if (da < cp || da >= (cp + s))
92 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
94 u64 a = of_read_addr(addr, na);
95 memset(addr, 0, na * 4);
98 addr[na - 2] = a >> 32;
99 addr[na - 1] = a & 0xffffffffu;
104 static unsigned int of_bus_default_get_flags(u32 *addr)
106 return IORESOURCE_MEM;
111 * PCI bus specific translator
114 static int of_bus_pci_match(struct device_node *np)
116 return !strcmp(np->type, "pci");
119 static void of_bus_pci_count_cells(struct device_node *np,
120 int *addrc, int *sizec)
128 static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
132 /* Check address type match */
133 if ((addr[0] ^ range[0]) & 0x03000000)
136 /* Read address values, skipping high cell */
137 cp = of_read_addr(range + 1, na - 1);
138 s = of_read_addr(range + na + pna, ns);
139 da = of_read_addr(addr + 1, na - 1);
141 DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
143 if (da < cp || da >= (cp + s))
148 static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
150 return of_bus_default_translate(addr + 1, offset, na - 1);
153 static unsigned int of_bus_pci_get_flags(u32 *addr)
155 unsigned int flags = 0;
158 switch((w >> 24) & 0x03) {
160 flags |= IORESOURCE_IO;
161 case 0x02: /* 32 bits */
162 case 0x03: /* 64 bits */
163 flags |= IORESOURCE_MEM;
166 flags |= IORESOURCE_PREFETCH;
171 * ISA bus specific translator
174 static int of_bus_isa_match(struct device_node *np)
176 return !strcmp(np->name, "isa");
179 static void of_bus_isa_count_cells(struct device_node *child,
180 int *addrc, int *sizec)
188 static u64 of_bus_isa_map(u32 *addr, u32 *range, int na, int ns, int pna)
192 /* Check address type match */
193 if ((addr[0] ^ range[0]) & 0x00000001)
196 /* Read address values, skipping high cell */
197 cp = of_read_addr(range + 1, na - 1);
198 s = of_read_addr(range + na + pna, ns);
199 da = of_read_addr(addr + 1, na - 1);
201 DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
203 if (da < cp || da >= (cp + s))
208 static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
210 return of_bus_default_translate(addr + 1, offset, na - 1);
213 static unsigned int of_bus_isa_get_flags(u32 *addr)
215 unsigned int flags = 0;
219 flags |= IORESOURCE_IO;
221 flags |= IORESOURCE_MEM;
227 * Array of bus specific translators
230 static struct of_bus of_busses[] = {
234 .addresses = "assigned-addresses",
235 .match = of_bus_pci_match,
236 .count_cells = of_bus_pci_count_cells,
237 .map = of_bus_pci_map,
238 .translate = of_bus_pci_translate,
239 .get_flags = of_bus_pci_get_flags,
245 .match = of_bus_isa_match,
246 .count_cells = of_bus_isa_count_cells,
247 .map = of_bus_isa_map,
248 .translate = of_bus_isa_translate,
249 .get_flags = of_bus_isa_get_flags,
256 .count_cells = of_bus_default_count_cells,
257 .map = of_bus_default_map,
258 .translate = of_bus_default_translate,
259 .get_flags = of_bus_default_get_flags,
263 static struct of_bus *of_match_bus(struct device_node *np)
267 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
268 if (!of_busses[i].match || of_busses[i].match(np))
269 return &of_busses[i];
274 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
275 struct of_bus *pbus, u32 *addr,
276 int na, int ns, int pna)
281 u64 offset = OF_BAD_ADDR;
283 /* Normally, an absence of a "ranges" property means we are
284 * crossing a non-translatable boundary, and thus the addresses
285 * below the current not cannot be converted to CPU physical ones.
286 * Unfortunately, while this is very clear in the spec, it's not
287 * what Apple understood, and they do have things like /uni-n or
288 * /ht nodes with no "ranges" property and a lot of perfectly
289 * useable mapped devices below them. Thus we treat the absence of
290 * "ranges" as equivalent to an empty "ranges" property which means
291 * a 1:1 translation at that level. It's up to the caller not to try
292 * to translate addresses that aren't supposed to be translated in
293 * the first place. --BenH.
295 ranges = (u32 *)get_property(parent, "ranges", &rlen);
296 if (ranges == NULL || rlen == 0) {
297 offset = of_read_addr(addr, na);
298 memset(addr, 0, pna * 4);
299 DBG("OF: no ranges, 1:1 translation\n");
303 DBG("OF: walking ranges...\n");
305 /* Now walk through the ranges */
307 rone = na + pna + ns;
308 for (; rlen >= rone; rlen -= rone, ranges += rone) {
309 offset = bus->map(addr, ranges, na, ns, pna);
310 if (offset != OF_BAD_ADDR)
313 if (offset == OF_BAD_ADDR) {
314 DBG("OF: not found !\n");
317 memcpy(addr, ranges + na, 4 * pna);
320 of_dump_addr("OF: parent translation for:", addr, pna);
321 DBG("OF: with offset: "PRu64"\n", offset);
323 /* Translate it into parent bus space */
324 return pbus->translate(addr, offset, pna);
329 * Translate an address from the device-tree into a CPU physical address,
330 * this walks up the tree and applies the various bus mappings on the
333 * Note: We consider that crossing any level with #size-cells == 0 to mean
334 * that translation is impossible (that is we are not dealing with a value
335 * that can be mapped to a cpu physical address). This is not really specified
336 * that way, but this is traditionally the way IBM at least do things
338 u64 of_translate_address(struct device_node *dev, u32 *in_addr)
340 struct device_node *parent = NULL;
341 struct of_bus *bus, *pbus;
342 u32 addr[OF_MAX_ADDR_CELLS];
343 int na, ns, pna, pns;
344 u64 result = OF_BAD_ADDR;
346 DBG("OF: ** translation for device %s **\n", dev->full_name);
348 /* Increase refcount at current level */
351 /* Get parent & match bus type */
352 parent = of_get_parent(dev);
355 bus = of_match_bus(parent);
357 /* Cound address cells & copy address locally */
358 bus->count_cells(dev, &na, &ns);
359 if (!OF_CHECK_COUNTS(na, ns)) {
360 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
364 memcpy(addr, in_addr, na * 4);
366 DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
367 bus->name, na, ns, parent->full_name);
368 of_dump_addr("OF: translating address:", addr, na);
372 /* Switch to parent bus */
375 parent = of_get_parent(dev);
377 /* If root, we have finished */
378 if (parent == NULL) {
379 DBG("OF: reached root node\n");
380 result = of_read_addr(addr, na);
384 /* Get new parent bus and counts */
385 pbus = of_match_bus(parent);
386 pbus->count_cells(dev, &pna, &pns);
387 if (!OF_CHECK_COUNTS(pna, pns)) {
388 printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
393 DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
394 pbus->name, pna, pns, parent->full_name);
396 /* Apply bus translation */
397 if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
400 /* Complete the move up one level */
405 of_dump_addr("OF: one level translation:", addr, na);
413 EXPORT_SYMBOL(of_translate_address);
415 u32 *of_get_address(struct device_node *dev, int index, u64 *size,
420 struct device_node *parent;
422 int onesize, i, na, ns;
424 /* Get parent & match bus type */
425 parent = of_get_parent(dev);
428 bus = of_match_bus(parent);
429 bus->count_cells(dev, &na, &ns);
431 if (!OF_CHECK_COUNTS(na, ns))
434 /* Get "reg" or "assigned-addresses" property */
435 prop = (u32 *)get_property(dev, bus->addresses, &psize);
441 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
444 *size = of_read_addr(prop + na, ns);
446 *flags = bus->get_flags(prop);
451 EXPORT_SYMBOL(of_get_address);
453 u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
458 struct device_node *parent;
460 int onesize, i, na, ns;
462 /* Get parent & match bus type */
463 parent = of_get_parent(dev);
466 bus = of_match_bus(parent);
467 if (strcmp(bus->name, "pci"))
469 bus->count_cells(dev, &na, &ns);
471 if (!OF_CHECK_COUNTS(na, ns))
474 /* Get "reg" or "assigned-addresses" property */
475 prop = (u32 *)get_property(dev, bus->addresses, &psize);
481 for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
482 if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
484 *size = of_read_addr(prop + na, ns);
486 *flags = bus->get_flags(prop);
491 EXPORT_SYMBOL(of_get_pci_address);
493 static int __of_address_to_resource(struct device_node *dev, u32 *addrp,
494 u64 size, unsigned int flags,
499 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
501 taddr = of_translate_address(dev, addrp);
502 if (taddr == OF_BAD_ADDR)
504 memset(r, 0, sizeof(struct resource));
505 if (flags & IORESOURCE_IO) {
507 port = pci_address_to_pio(taddr);
508 if (port == (unsigned long)-1)
511 r->end = port + size - 1;
514 r->end = taddr + size - 1;
521 int of_address_to_resource(struct device_node *dev, int index,
528 addrp = of_get_address(dev, index, &size, &flags);
531 return __of_address_to_resource(dev, addrp, size, flags, r);
533 EXPORT_SYMBOL_GPL(of_address_to_resource);
535 int of_pci_address_to_resource(struct device_node *dev, int bar,
542 addrp = of_get_pci_address(dev, bar, &size, &flags);
545 return __of_address_to_resource(dev, addrp, size, flags, r);
547 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);