1 #include <linux/config.h>
2 #include <linux/string.h>
3 #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>
10 #include <asm/of_device.h>
13 * of_match_device - Tell if an of_device structure has a matching
15 * @ids: array of of device match structures to search in
16 * @dev: the of device structure to match against
18 * Used by a driver to check whether an of_device present in the
19 * system is in its list of supported devices.
21 const struct of_device_id *of_match_device(const struct of_device_id *matches,
22 const struct of_device *dev)
26 while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
29 match &= dev->node->name
30 && !strcmp(matches->name, dev->node->name);
32 match &= dev->node->type
33 && !strcmp(matches->type, dev->node->type);
34 if (matches->compatible[0])
35 match &= of_device_is_compatible(dev->node,
44 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
46 struct of_device * of_dev = to_of_device(dev);
47 struct of_platform_driver * of_drv = to_of_platform_driver(drv);
48 const struct of_device_id * matches = of_drv->match_table;
53 return of_match_device(matches, of_dev) != NULL;
56 struct of_device *of_dev_get(struct of_device *dev)
62 tmp = get_device(&dev->dev);
64 return to_of_device(tmp);
69 void of_dev_put(struct of_device *dev)
72 put_device(&dev->dev);
76 static int of_device_probe(struct device *dev)
79 struct of_platform_driver *drv;
80 struct of_device *of_dev;
81 const struct of_device_id *match;
83 drv = to_of_platform_driver(dev->driver);
84 of_dev = to_of_device(dev);
91 match = of_match_device(drv->match_table, of_dev);
93 error = drv->probe(of_dev, match);
100 static int of_device_remove(struct device *dev)
102 struct of_device * of_dev = to_of_device(dev);
103 struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
105 if (dev->driver && drv->remove)
110 static int of_device_suspend(struct device *dev, pm_message_t state)
112 struct of_device * of_dev = to_of_device(dev);
113 struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
116 if (dev->driver && drv->suspend)
117 error = drv->suspend(of_dev, state);
121 static int of_device_resume(struct device * dev)
123 struct of_device * of_dev = to_of_device(dev);
124 struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
127 if (dev->driver && drv->resume)
128 error = drv->resume(of_dev);
132 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
134 unsigned long ret = res->start + offset;
136 if (!request_region(ret, size, name))
139 return (void __iomem *) ret;
141 EXPORT_SYMBOL(of_ioremap);
143 void of_iounmap(void __iomem *base, unsigned long size)
145 release_region((unsigned long) base, size);
147 EXPORT_SYMBOL(of_iounmap);
149 static int node_match(struct device *dev, void *data)
151 struct of_device *op = to_of_device(dev);
152 struct device_node *dp = data;
154 return (op->node == dp);
157 struct of_device *of_find_device_by_node(struct device_node *dp)
159 struct device *dev = bus_find_device(&of_bus_type, NULL,
163 return to_of_device(dev);
167 EXPORT_SYMBOL(of_find_device_by_node);
170 struct bus_type isa_bus_type = {
172 .match = of_platform_bus_match,
173 .probe = of_device_probe,
174 .remove = of_device_remove,
175 .suspend = of_device_suspend,
176 .resume = of_device_resume,
178 EXPORT_SYMBOL(isa_bus_type);
180 struct bus_type ebus_bus_type = {
182 .match = of_platform_bus_match,
183 .probe = of_device_probe,
184 .remove = of_device_remove,
185 .suspend = of_device_suspend,
186 .resume = of_device_resume,
188 EXPORT_SYMBOL(ebus_bus_type);
192 struct bus_type sbus_bus_type = {
194 .match = of_platform_bus_match,
195 .probe = of_device_probe,
196 .remove = of_device_remove,
197 .suspend = of_device_suspend,
198 .resume = of_device_resume,
200 EXPORT_SYMBOL(sbus_bus_type);
203 struct bus_type of_bus_type = {
205 .match = of_platform_bus_match,
206 .probe = of_device_probe,
207 .remove = of_device_remove,
208 .suspend = of_device_suspend,
209 .resume = of_device_resume,
211 EXPORT_SYMBOL(of_bus_type);
213 static inline u64 of_read_addr(const u32 *cell, int size)
217 r = (r << 32) | *(cell++);
221 static void __init get_cells(struct device_node *dp,
222 int *addrc, int *sizec)
225 *addrc = of_n_addr_cells(dp);
227 *sizec = of_n_size_cells(dp);
230 /* Max address size we deal with */
231 #define OF_MAX_ADDR_CELLS 4
235 const char *addr_prop_name;
236 int (*match)(struct device_node *parent);
237 void (*count_cells)(struct device_node *child,
238 int *addrc, int *sizec);
239 int (*map)(u32 *addr, const u32 *range,
240 int na, int ns, int pna);
241 unsigned int (*get_flags)(u32 *addr);
245 * Default translator (generic bus)
248 static void of_bus_default_count_cells(struct device_node *dev,
249 int *addrc, int *sizec)
251 get_cells(dev, addrc, sizec);
254 /* Make sure the least significant 64-bits are in-range. Even
255 * for 3 or 4 cell values it is a good enough approximation.
257 static int of_out_of_range(const u32 *addr, const u32 *base,
258 const u32 *size, int na, int ns)
260 u64 a = of_read_addr(addr, na);
261 u64 b = of_read_addr(base, na);
266 b += of_read_addr(size, ns);
273 static int of_bus_default_map(u32 *addr, const u32 *range,
274 int na, int ns, int pna)
276 u32 result[OF_MAX_ADDR_CELLS];
280 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
284 if (of_out_of_range(addr, range, range + na + pna, na, ns))
287 /* Start with the parent range base. */
288 memcpy(result, range + na, pna * 4);
290 /* Add in the child address offset. */
291 for (i = 0; i < na; i++)
292 result[pna - 1 - i] +=
296 memcpy(addr, result, pna * 4);
301 static unsigned int of_bus_default_get_flags(u32 *addr)
303 return IORESOURCE_MEM;
307 * PCI bus specific translator
310 static int of_bus_pci_match(struct device_node *np)
312 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
313 /* Do not do PCI specific frobbing if the
314 * PCI bridge lacks a ranges property. We
315 * want to pass it through up to the next
316 * parent as-is, not with the PCI translate
317 * method which chops off the top address cell.
319 if (!of_find_property(np, "ranges", NULL))
328 static void of_bus_pci_count_cells(struct device_node *np,
329 int *addrc, int *sizec)
337 static int of_bus_pci_map(u32 *addr, const u32 *range,
338 int na, int ns, int pna)
340 u32 result[OF_MAX_ADDR_CELLS];
343 /* Check address type match */
344 if ((addr[0] ^ range[0]) & 0x03000000)
347 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
351 /* Start with the parent range base. */
352 memcpy(result, range + na, pna * 4);
354 /* Add in the child address offset, skipping high cell. */
355 for (i = 0; i < na - 1; i++)
356 result[pna - 1 - i] +=
360 memcpy(addr, result, pna * 4);
365 static unsigned int of_bus_pci_get_flags(u32 *addr)
367 unsigned int flags = 0;
370 switch((w >> 24) & 0x03) {
372 flags |= IORESOURCE_IO;
373 case 0x02: /* 32 bits */
374 case 0x03: /* 64 bits */
375 flags |= IORESOURCE_MEM;
378 flags |= IORESOURCE_PREFETCH;
383 * SBUS bus specific translator
386 static int of_bus_sbus_match(struct device_node *np)
388 return !strcmp(np->name, "sbus") ||
389 !strcmp(np->name, "sbi");
392 static void of_bus_sbus_count_cells(struct device_node *child,
393 int *addrc, int *sizec)
401 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
403 return of_bus_default_map(addr, range, na, ns, pna);
406 static unsigned int of_bus_sbus_get_flags(u32 *addr)
408 return IORESOURCE_MEM;
413 * Array of bus specific translators
416 static struct of_bus of_busses[] = {
420 .addr_prop_name = "assigned-addresses",
421 .match = of_bus_pci_match,
422 .count_cells = of_bus_pci_count_cells,
423 .map = of_bus_pci_map,
424 .get_flags = of_bus_pci_get_flags,
429 .addr_prop_name = "reg",
430 .match = of_bus_sbus_match,
431 .count_cells = of_bus_sbus_count_cells,
432 .map = of_bus_sbus_map,
433 .get_flags = of_bus_sbus_get_flags,
438 .addr_prop_name = "reg",
440 .count_cells = of_bus_default_count_cells,
441 .map = of_bus_default_map,
442 .get_flags = of_bus_default_get_flags,
446 static struct of_bus *of_match_bus(struct device_node *np)
450 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
451 if (!of_busses[i].match || of_busses[i].match(np))
452 return &of_busses[i];
457 static int __init build_one_resource(struct device_node *parent,
461 int na, int ns, int pna)
467 ranges = of_get_property(parent, "ranges", &rlen);
468 if (ranges == NULL || rlen == 0) {
469 u32 result[OF_MAX_ADDR_CELLS];
472 memset(result, 0, pna * 4);
473 for (i = 0; i < na; i++)
474 result[pna - 1 - i] =
477 memcpy(addr, result, pna * 4);
481 /* Now walk through the ranges */
483 rone = na + pna + ns;
484 for (; rlen >= rone; rlen -= rone, ranges += rone) {
485 if (!bus->map(addr, ranges, na, ns, pna))
492 static int __init use_1to1_mapping(struct device_node *pp)
496 /* If this is on the PMU bus, don't try to translate it even
497 * if a ranges property exists.
499 if (!strcmp(pp->name, "pmu"))
502 /* If we have a ranges property in the parent, use it. */
503 if (of_find_property(pp, "ranges", NULL) != NULL)
506 /* If the parent is the dma node of an ISA bus, pass
507 * the translation up to the root.
509 if (!strcmp(pp->name, "dma"))
512 /* Similarly for Simba PCI bridges. */
513 model = of_get_property(pp, "model", NULL);
514 if (model && !strcmp(model, "SUNW,simba"))
520 static int of_resource_verbose;
522 static void __init build_device_resources(struct of_device *op,
523 struct device *parent)
525 struct of_device *p_op;
534 p_op = to_of_device(parent);
535 bus = of_match_bus(p_op->node);
536 bus->count_cells(op->node, &na, &ns);
538 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
539 if (!preg || num_reg == 0)
542 /* Convert to num-cells. */
545 /* Conver to num-entries. */
548 for (index = 0; index < num_reg; index++) {
549 struct resource *r = &op->resource[index];
550 u32 addr[OF_MAX_ADDR_CELLS];
551 u32 *reg = (preg + (index * ((na + ns) * 4)));
552 struct device_node *dp = op->node;
553 struct device_node *pp = p_op->node;
555 u64 size, result = OF_BAD_ADDR;
560 size = of_read_addr(reg + na, ns);
561 flags = bus->get_flags(reg);
563 memcpy(addr, reg, na * 4);
565 if (use_1to1_mapping(pp)) {
566 result = of_read_addr(addr, na);
577 result = of_read_addr(addr, dna);
581 pbus = of_match_bus(pp);
582 pbus->count_cells(dp, &pna, &pns);
584 if (build_one_resource(dp, bus, pbus, addr,
594 memset(r, 0, sizeof(*r));
596 if (of_resource_verbose)
597 printk("%s reg[%d] -> %lx\n",
598 op->node->full_name, index,
601 if (result != OF_BAD_ADDR) {
602 if (tlb_type == hypervisor)
603 result &= 0x0fffffffffffffffUL;
606 r->end = result + size - 1;
612 r->name = op->node->name;
616 static struct device_node * __init
617 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
618 u32 *imap, int imlen, u32 *imask,
621 struct device_node *cp;
622 unsigned int irq = *irq_p;
628 bus = of_match_bus(pp);
629 bus->count_cells(dp, &na, NULL);
631 reg = of_get_property(dp, "reg", &num_reg);
632 if (!reg || !num_reg)
635 imlen /= ((na + 3) * 4);
637 for (i = 0; i < imlen; i++) {
640 for (j = 0; j < na; j++) {
641 if ((reg[j] & imask[j]) != imap[j])
644 if (imap[na] == irq) {
645 handle = imap[na + 1];
657 cp = of_find_node_by_phandle(handle);
662 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
663 struct device_node *pp,
666 struct linux_prom_pci_registers *regs;
667 unsigned int devfn, slot, ret;
669 if (irq < 1 || irq > 4)
672 regs = of_get_property(dp, "reg", NULL);
676 devfn = (regs->phys_hi >> 8) & 0xff;
677 slot = (devfn >> 3) & 0x1f;
679 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
684 static int of_irq_verbose;
686 static unsigned int __init build_one_device_irq(struct of_device *op,
687 struct device *parent,
690 struct device_node *dp = op->node;
691 struct device_node *pp, *ip;
692 unsigned int orig_irq = irq;
694 if (irq == 0xffffffff)
698 irq = dp->irq_trans->irq_build(dp, irq,
699 dp->irq_trans->data);
702 printk("%s: direct translate %x --> %x\n",
703 dp->full_name, orig_irq, irq);
708 /* Something more complicated. Walk up to the root, applying
709 * interrupt-map or bus specific translations, until we hit
712 * If we hit a bus type or situation we cannot handle, we
713 * stop and assume that the original IRQ number was in a
714 * format which has special meaning to it's immediate parent.
722 imap = of_get_property(pp, "interrupt-map", &imlen);
723 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
725 struct device_node *iret;
726 int this_orig_irq = irq;
728 iret = apply_interrupt_map(dp, pp,
733 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
735 pp->full_name, this_orig_irq,
736 (iret ? iret->full_name : "NULL"), irq);
741 if (iret->irq_trans) {
746 if (!strcmp(pp->type, "pci") ||
747 !strcmp(pp->type, "pciex")) {
748 unsigned int this_orig_irq = irq;
750 irq = pci_irq_swizzle(dp, pp, irq);
752 printk("%s: PCI swizzle [%s] "
755 pp->full_name, this_orig_irq,
771 irq = ip->irq_trans->irq_build(op->node, irq,
772 ip->irq_trans->data);
774 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
775 op->node->full_name, ip->full_name, orig_irq, irq);
780 static struct of_device * __init scan_one_device(struct device_node *dp,
781 struct device *parent)
783 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
792 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
794 op->portid = of_getintprop_default(dp, "upa-portid", -1);
795 if (op->portid == -1)
796 op->portid = of_getintprop_default(dp, "portid", -1);
798 irq = of_get_property(dp, "interrupts", &len);
800 memcpy(op->irqs, irq, len);
801 op->num_irqs = len / 4;
806 build_device_resources(op, parent);
807 for (i = 0; i < op->num_irqs; i++)
808 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
810 op->dev.parent = parent;
811 op->dev.bus = &of_bus_type;
813 strcpy(op->dev.bus_id, "root");
815 strcpy(op->dev.bus_id, dp->path_component_name);
817 if (of_device_register(op)) {
818 printk("%s: Could not register of device.\n",
827 static void __init scan_tree(struct device_node *dp, struct device *parent)
830 struct of_device *op = scan_one_device(dp, parent);
833 scan_tree(dp->child, &op->dev);
839 static void __init scan_of_devices(void)
841 struct device_node *root = of_find_node_by_path("/");
842 struct of_device *parent;
844 parent = scan_one_device(root, NULL);
848 scan_tree(root->child, &parent->dev);
851 static int __init of_bus_driver_init(void)
855 err = bus_register(&of_bus_type);
858 err = bus_register(&isa_bus_type);
860 err = bus_register(&ebus_bus_type);
864 err = bus_register(&sbus_bus_type);
873 postcore_initcall(of_bus_driver_init);
875 static int __init of_debug(char *str)
879 get_option(&str, &val);
881 of_resource_verbose = 1;
887 __setup("of_debug=", of_debug);
889 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
891 /* initialize common driver fields */
892 drv->driver.name = drv->name;
893 drv->driver.bus = bus;
895 /* register with core */
896 return driver_register(&drv->driver);
899 void of_unregister_driver(struct of_platform_driver *drv)
901 driver_unregister(&drv->driver);
905 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
907 struct of_device *ofdev;
909 ofdev = to_of_device(dev);
910 return sprintf(buf, "%s", ofdev->node->full_name);
913 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
916 * of_release_dev - free an of device structure when all users of it are finished.
917 * @dev: device that's been disconnected
919 * Will be called only by the device core when all users of this of device are
922 void of_release_dev(struct device *dev)
924 struct of_device *ofdev;
926 ofdev = to_of_device(dev);
931 int of_device_register(struct of_device *ofdev)
935 BUG_ON(ofdev->node == NULL);
937 rc = device_register(&ofdev->dev);
941 rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
943 device_unregister(&ofdev->dev);
948 void of_device_unregister(struct of_device *ofdev)
950 device_remove_file(&ofdev->dev, &dev_attr_devspec);
951 device_unregister(&ofdev->dev);
954 struct of_device* of_platform_device_create(struct device_node *np,
956 struct device *parent,
957 struct bus_type *bus)
959 struct of_device *dev;
961 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
964 memset(dev, 0, sizeof(*dev));
966 dev->dev.parent = parent;
968 dev->dev.release = of_release_dev;
970 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
972 if (of_device_register(dev) != 0) {
980 EXPORT_SYMBOL(of_match_device);
981 EXPORT_SYMBOL(of_register_driver);
982 EXPORT_SYMBOL(of_unregister_driver);
983 EXPORT_SYMBOL(of_device_register);
984 EXPORT_SYMBOL(of_device_unregister);
985 EXPORT_SYMBOL(of_dev_get);
986 EXPORT_SYMBOL(of_dev_put);
987 EXPORT_SYMBOL(of_platform_device_create);
988 EXPORT_SYMBOL(of_release_dev);