1 #include <linux/string.h>
2 #include <linux/kernel.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/slab.h>
8 #include <linux/errno.h>
10 #include <linux/of_device.h>
11 #include <linux/of_platform.h>
13 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
15 unsigned long ret = res->start + offset;
18 if (res->flags & IORESOURCE_MEM)
19 r = request_mem_region(ret, size, name);
21 r = request_region(ret, size, name);
25 return (void __iomem *) ret;
27 EXPORT_SYMBOL(of_ioremap);
29 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
31 if (res->flags & IORESOURCE_MEM)
32 release_mem_region((unsigned long) base, size);
34 release_region((unsigned long) base, size);
36 EXPORT_SYMBOL(of_iounmap);
38 static int node_match(struct device *dev, void *data)
40 struct of_device *op = to_of_device(dev);
41 struct device_node *dp = data;
43 return (op->node == dp);
46 struct of_device *of_find_device_by_node(struct device_node *dp)
48 struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
52 return to_of_device(dev);
56 EXPORT_SYMBOL(of_find_device_by_node);
59 struct bus_type isa_bus_type;
60 EXPORT_SYMBOL(isa_bus_type);
62 struct bus_type ebus_bus_type;
63 EXPORT_SYMBOL(ebus_bus_type);
67 struct bus_type sbus_bus_type;
68 EXPORT_SYMBOL(sbus_bus_type);
71 struct bus_type of_platform_bus_type;
72 EXPORT_SYMBOL(of_platform_bus_type);
74 static inline u64 of_read_addr(const u32 *cell, int size)
78 r = (r << 32) | *(cell++);
82 static void __init get_cells(struct device_node *dp,
83 int *addrc, int *sizec)
86 *addrc = of_n_addr_cells(dp);
88 *sizec = of_n_size_cells(dp);
91 /* Max address size we deal with */
92 #define OF_MAX_ADDR_CELLS 4
96 const char *addr_prop_name;
97 int (*match)(struct device_node *parent);
98 void (*count_cells)(struct device_node *child,
99 int *addrc, int *sizec);
100 int (*map)(u32 *addr, const u32 *range,
101 int na, int ns, int pna);
102 unsigned int (*get_flags)(const u32 *addr);
106 * Default translator (generic bus)
109 static void of_bus_default_count_cells(struct device_node *dev,
110 int *addrc, int *sizec)
112 get_cells(dev, addrc, sizec);
115 /* Make sure the least significant 64-bits are in-range. Even
116 * for 3 or 4 cell values it is a good enough approximation.
118 static int of_out_of_range(const u32 *addr, const u32 *base,
119 const u32 *size, int na, int ns)
121 u64 a = of_read_addr(addr, na);
122 u64 b = of_read_addr(base, na);
127 b += of_read_addr(size, ns);
134 static int of_bus_default_map(u32 *addr, const u32 *range,
135 int na, int ns, int pna)
137 u32 result[OF_MAX_ADDR_CELLS];
141 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
145 if (of_out_of_range(addr, range, range + na + pna, na, ns))
148 /* Start with the parent range base. */
149 memcpy(result, range + na, pna * 4);
151 /* Add in the child address offset. */
152 for (i = 0; i < na; i++)
153 result[pna - 1 - i] +=
157 memcpy(addr, result, pna * 4);
162 static unsigned int of_bus_default_get_flags(const u32 *addr)
164 return IORESOURCE_MEM;
168 * PCI bus specific translator
171 static int of_bus_pci_match(struct device_node *np)
173 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
174 const char *model = of_get_property(np, "model", NULL);
176 if (model && !strcmp(model, "SUNW,simba"))
179 /* Do not do PCI specific frobbing if the
180 * PCI bridge lacks a ranges property. We
181 * want to pass it through up to the next
182 * parent as-is, not with the PCI translate
183 * method which chops off the top address cell.
185 if (!of_find_property(np, "ranges", NULL))
194 static int of_bus_simba_match(struct device_node *np)
196 const char *model = of_get_property(np, "model", NULL);
198 if (model && !strcmp(model, "SUNW,simba"))
201 /* Treat PCI busses lacking ranges property just like
204 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
205 if (!of_find_property(np, "ranges", NULL))
212 static int of_bus_simba_map(u32 *addr, const u32 *range,
213 int na, int ns, int pna)
218 static void of_bus_pci_count_cells(struct device_node *np,
219 int *addrc, int *sizec)
227 static int of_bus_pci_map(u32 *addr, const u32 *range,
228 int na, int ns, int pna)
230 u32 result[OF_MAX_ADDR_CELLS];
233 /* Check address type match */
234 if ((addr[0] ^ range[0]) & 0x03000000)
237 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
241 /* Start with the parent range base. */
242 memcpy(result, range + na, pna * 4);
244 /* Add in the child address offset, skipping high cell. */
245 for (i = 0; i < na - 1; i++)
246 result[pna - 1 - i] +=
250 memcpy(addr, result, pna * 4);
255 static unsigned int of_bus_pci_get_flags(const u32 *addr)
257 unsigned int flags = 0;
260 switch((w >> 24) & 0x03) {
262 flags |= IORESOURCE_IO;
263 case 0x02: /* 32 bits */
264 case 0x03: /* 64 bits */
265 flags |= IORESOURCE_MEM;
268 flags |= IORESOURCE_PREFETCH;
273 * SBUS bus specific translator
276 static int of_bus_sbus_match(struct device_node *np)
278 return !strcmp(np->name, "sbus") ||
279 !strcmp(np->name, "sbi");
282 static void of_bus_sbus_count_cells(struct device_node *child,
283 int *addrc, int *sizec)
292 * FHC/Central bus specific translator.
294 * This is just needed to hard-code the address and size cell
295 * counts. 'fhc' and 'central' nodes lack the #address-cells and
296 * #size-cells properties, and if you walk to the root on such
297 * Enterprise boxes all you'll get is a #size-cells of 2 which is
298 * not what we want to use.
300 static int of_bus_fhc_match(struct device_node *np)
302 return !strcmp(np->name, "fhc") ||
303 !strcmp(np->name, "central");
306 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
309 * Array of bus specific translators
312 static struct of_bus of_busses[] = {
316 .addr_prop_name = "assigned-addresses",
317 .match = of_bus_pci_match,
318 .count_cells = of_bus_pci_count_cells,
319 .map = of_bus_pci_map,
320 .get_flags = of_bus_pci_get_flags,
325 .addr_prop_name = "assigned-addresses",
326 .match = of_bus_simba_match,
327 .count_cells = of_bus_pci_count_cells,
328 .map = of_bus_simba_map,
329 .get_flags = of_bus_pci_get_flags,
334 .addr_prop_name = "reg",
335 .match = of_bus_sbus_match,
336 .count_cells = of_bus_sbus_count_cells,
337 .map = of_bus_default_map,
338 .get_flags = of_bus_default_get_flags,
343 .addr_prop_name = "reg",
344 .match = of_bus_fhc_match,
345 .count_cells = of_bus_fhc_count_cells,
346 .map = of_bus_default_map,
347 .get_flags = of_bus_default_get_flags,
352 .addr_prop_name = "reg",
354 .count_cells = of_bus_default_count_cells,
355 .map = of_bus_default_map,
356 .get_flags = of_bus_default_get_flags,
360 static struct of_bus *of_match_bus(struct device_node *np)
364 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
365 if (!of_busses[i].match || of_busses[i].match(np))
366 return &of_busses[i];
371 static int __init build_one_resource(struct device_node *parent,
375 int na, int ns, int pna)
381 ranges = of_get_property(parent, "ranges", &rlen);
382 if (ranges == NULL || rlen == 0) {
383 u32 result[OF_MAX_ADDR_CELLS];
386 memset(result, 0, pna * 4);
387 for (i = 0; i < na; i++)
388 result[pna - 1 - i] =
391 memcpy(addr, result, pna * 4);
395 /* Now walk through the ranges */
397 rone = na + pna + ns;
398 for (; rlen >= rone; rlen -= rone, ranges += rone) {
399 if (!bus->map(addr, ranges, na, ns, pna))
403 /* When we miss an I/O space match on PCI, just pass it up
404 * to the next PCI bridge and/or controller.
406 if (!strcmp(bus->name, "pci") &&
407 (addr[0] & 0x03000000) == 0x01000000)
413 static int __init use_1to1_mapping(struct device_node *pp)
415 /* If we have a ranges property in the parent, use it. */
416 if (of_find_property(pp, "ranges", NULL) != NULL)
419 /* If the parent is the dma node of an ISA bus, pass
420 * the translation up to the root.
422 if (!strcmp(pp->name, "dma"))
425 /* Similarly for all PCI bridges, if we get this far
426 * it lacks a ranges property, and this will include
429 if (!strcmp(pp->type, "pci") || !strcmp(pp->type, "pciex"))
435 static int of_resource_verbose;
437 static void __init build_device_resources(struct of_device *op,
438 struct device *parent)
440 struct of_device *p_op;
449 p_op = to_of_device(parent);
450 bus = of_match_bus(p_op->node);
451 bus->count_cells(op->node, &na, &ns);
453 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
454 if (!preg || num_reg == 0)
457 /* Convert to num-cells. */
460 /* Convert to num-entries. */
463 /* Prevent overrunning the op->resources[] array. */
464 if (num_reg > PROMREG_MAX) {
465 printk(KERN_WARNING "%s: Too many regs (%d), "
467 op->node->full_name, num_reg, PROMREG_MAX);
468 num_reg = PROMREG_MAX;
471 for (index = 0; index < num_reg; index++) {
472 struct resource *r = &op->resource[index];
473 u32 addr[OF_MAX_ADDR_CELLS];
474 const u32 *reg = (preg + (index * ((na + ns) * 4)));
475 struct device_node *dp = op->node;
476 struct device_node *pp = p_op->node;
477 struct of_bus *pbus, *dbus;
478 u64 size, result = OF_BAD_ADDR;
483 size = of_read_addr(reg + na, ns);
484 flags = bus->get_flags(reg);
486 memcpy(addr, reg, na * 4);
488 if (use_1to1_mapping(pp)) {
489 result = of_read_addr(addr, na);
501 result = of_read_addr(addr, dna);
505 pbus = of_match_bus(pp);
506 pbus->count_cells(dp, &pna, &pns);
508 if (build_one_resource(dp, dbus, pbus, addr,
518 memset(r, 0, sizeof(*r));
520 if (of_resource_verbose)
521 printk("%s reg[%d] -> %lx\n",
522 op->node->full_name, index,
525 if (result != OF_BAD_ADDR) {
526 if (tlb_type == hypervisor)
527 result &= 0x0fffffffffffffffUL;
530 r->end = result + size - 1;
533 r->name = op->node->name;
537 static struct device_node * __init
538 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
539 const u32 *imap, int imlen, const u32 *imask,
542 struct device_node *cp;
543 unsigned int irq = *irq_p;
549 bus = of_match_bus(pp);
550 bus->count_cells(dp, &na, NULL);
552 reg = of_get_property(dp, "reg", &num_reg);
553 if (!reg || !num_reg)
556 imlen /= ((na + 3) * 4);
558 for (i = 0; i < imlen; i++) {
561 for (j = 0; j < na; j++) {
562 if ((reg[j] & imask[j]) != imap[j])
565 if (imap[na] == irq) {
566 handle = imap[na + 1];
575 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
576 * properties that do not include the on-board device
577 * interrupts. Instead, the device's 'interrupts' property
578 * is already a fully specified INO value.
580 * Handle this by deciding that, if we didn't get a
581 * match in the parent's 'interrupt-map', and the
582 * parent is an IRQ translater, then use the parent as
583 * our IRQ controller.
592 cp = of_find_node_by_phandle(handle);
597 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
598 struct device_node *pp,
601 const struct linux_prom_pci_registers *regs;
602 unsigned int bus, devfn, slot, ret;
604 if (irq < 1 || irq > 4)
607 regs = of_get_property(dp, "reg", NULL);
611 bus = (regs->phys_hi >> 16) & 0xff;
612 devfn = (regs->phys_hi >> 8) & 0xff;
613 slot = (devfn >> 3) & 0x1f;
616 /* Derived from Table 8-3, U2P User's Manual. This branch
617 * is handling a PCI controller that lacks a proper set of
618 * interrupt-map and interrupt-map-mask properties. The
619 * Ultra-E450 is one example.
621 * The bit layout is BSSLL, where:
622 * B: 0 on bus A, 1 on bus B
623 * D: 2-bit slot number, derived from PCI device number as
624 * (dev - 1) for bus A, or (dev - 2) for bus B
625 * L: 2-bit line number
630 slot = (slot - 1) << 2;
634 slot = (slot - 2) << 2;
638 ret = (bus | slot | irq);
640 /* Going through a PCI-PCI bridge that lacks a set of
641 * interrupt-map and interrupt-map-mask properties.
643 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
649 static int of_irq_verbose;
651 static unsigned int __init build_one_device_irq(struct of_device *op,
652 struct device *parent,
655 struct device_node *dp = op->node;
656 struct device_node *pp, *ip;
657 unsigned int orig_irq = irq;
660 if (irq == 0xffffffff)
664 irq = dp->irq_trans->irq_build(dp, irq,
665 dp->irq_trans->data);
668 printk("%s: direct translate %x --> %x\n",
669 dp->full_name, orig_irq, irq);
674 /* Something more complicated. Walk up to the root, applying
675 * interrupt-map or bus specific translations, until we hit
678 * If we hit a bus type or situation we cannot handle, we
679 * stop and assume that the original IRQ number was in a
680 * format which has special meaning to it's immediate parent.
685 const void *imap, *imsk;
688 imap = of_get_property(pp, "interrupt-map", &imlen);
689 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
691 struct device_node *iret;
692 int this_orig_irq = irq;
694 iret = apply_interrupt_map(dp, pp,
699 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
701 pp->full_name, this_orig_irq,
702 (iret ? iret->full_name : "NULL"), irq);
707 if (iret->irq_trans) {
712 if (!strcmp(pp->type, "pci") ||
713 !strcmp(pp->type, "pciex")) {
714 unsigned int this_orig_irq = irq;
716 irq = pci_irq_swizzle(dp, pp, irq);
718 printk("%s: PCI swizzle [%s] "
721 pp->full_name, this_orig_irq,
737 irq = ip->irq_trans->irq_build(op->node, irq,
738 ip->irq_trans->data);
740 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
741 op->node->full_name, ip->full_name, orig_irq, irq);
744 nid = of_node_to_nid(dp);
746 cpumask_t numa_mask = node_to_cpumask(nid);
748 irq_set_affinity(irq, numa_mask);
754 static struct of_device * __init scan_one_device(struct device_node *dp,
755 struct device *parent)
757 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
758 const unsigned int *irq;
759 struct dev_archdata *sd;
765 sd = &op->dev.archdata;
771 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
773 op->portid = of_getintprop_default(dp, "upa-portid", -1);
774 if (op->portid == -1)
775 op->portid = of_getintprop_default(dp, "portid", -1);
777 irq = of_get_property(dp, "interrupts", &len);
779 memcpy(op->irqs, irq, len);
780 op->num_irqs = len / 4;
785 /* Prevent overrunning the op->irqs[] array. */
786 if (op->num_irqs > PROMINTR_MAX) {
787 printk(KERN_WARNING "%s: Too many irqs (%d), "
789 dp->full_name, op->num_irqs, PROMINTR_MAX);
790 op->num_irqs = PROMINTR_MAX;
793 build_device_resources(op, parent);
794 for (i = 0; i < op->num_irqs; i++)
795 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
797 op->dev.parent = parent;
798 op->dev.bus = &of_platform_bus_type;
800 dev_set_name(&op->dev, "root");
802 dev_set_name(&op->dev, "%08x", dp->node);
804 if (of_device_register(op)) {
805 printk("%s: Could not register of device.\n",
814 static void __init scan_tree(struct device_node *dp, struct device *parent)
817 struct of_device *op = scan_one_device(dp, parent);
820 scan_tree(dp->child, &op->dev);
826 static void __init scan_of_devices(void)
828 struct device_node *root = of_find_node_by_path("/");
829 struct of_device *parent;
831 parent = scan_one_device(root, NULL);
835 scan_tree(root->child, &parent->dev);
838 static int __init of_bus_driver_init(void)
842 err = of_bus_type_init(&of_platform_bus_type, "of");
845 err = of_bus_type_init(&isa_bus_type, "isa");
847 err = of_bus_type_init(&ebus_bus_type, "ebus");
851 err = of_bus_type_init(&sbus_bus_type, "sbus");
860 postcore_initcall(of_bus_driver_init);
862 static int __init of_debug(char *str)
866 get_option(&str, &val);
868 of_resource_verbose = 1;
874 __setup("of_debug=", of_debug);