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 static int node_match(struct device *dev, void *data)
134 struct of_device *op = to_of_device(dev);
135 struct device_node *dp = data;
137 return (op->node == dp);
140 struct of_device *of_find_device_by_node(struct device_node *dp)
142 struct device *dev = bus_find_device(&of_bus_type, NULL,
146 return to_of_device(dev);
150 EXPORT_SYMBOL(of_find_device_by_node);
153 struct bus_type ebus_bus_type = {
155 .match = of_platform_bus_match,
156 .probe = of_device_probe,
157 .remove = of_device_remove,
158 .suspend = of_device_suspend,
159 .resume = of_device_resume,
161 EXPORT_SYMBOL(ebus_bus_type);
165 struct bus_type sbus_bus_type = {
167 .match = of_platform_bus_match,
168 .probe = of_device_probe,
169 .remove = of_device_remove,
170 .suspend = of_device_suspend,
171 .resume = of_device_resume,
173 EXPORT_SYMBOL(sbus_bus_type);
176 struct bus_type of_bus_type = {
178 .match = of_platform_bus_match,
179 .probe = of_device_probe,
180 .remove = of_device_remove,
181 .suspend = of_device_suspend,
182 .resume = of_device_resume,
184 EXPORT_SYMBOL(of_bus_type);
186 static inline u64 of_read_addr(u32 *cell, int size)
190 r = (r << 32) | *(cell++);
194 static void __init get_cells(struct device_node *dp,
195 int *addrc, int *sizec)
198 *addrc = of_n_addr_cells(dp);
200 *sizec = of_n_size_cells(dp);
203 /* Max address size we deal with */
204 #define OF_MAX_ADDR_CELLS 4
208 const char *addr_prop_name;
209 int (*match)(struct device_node *parent);
210 void (*count_cells)(struct device_node *child,
211 int *addrc, int *sizec);
212 u64 (*map)(u32 *addr, u32 *range, int na, int ns, int pna);
213 int (*translate)(u32 *addr, u64 offset, int na);
214 unsigned int (*get_flags)(u32 *addr);
218 * Default translator (generic bus)
221 static void of_bus_default_count_cells(struct device_node *dev,
222 int *addrc, int *sizec)
224 get_cells(dev, addrc, sizec);
227 static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
231 cp = of_read_addr(range, na);
232 s = of_read_addr(range + na + pna, ns);
233 da = of_read_addr(addr, na);
235 if (da < cp || da >= (cp + s))
240 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
242 u64 a = of_read_addr(addr, na);
243 memset(addr, 0, na * 4);
246 addr[na - 2] = a >> 32;
247 addr[na - 1] = a & 0xffffffffu;
252 static unsigned int of_bus_default_get_flags(u32 *addr)
254 return IORESOURCE_MEM;
259 * PCI bus specific translator
262 static int of_bus_pci_match(struct device_node *np)
264 return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex");
267 static void of_bus_pci_count_cells(struct device_node *np,
268 int *addrc, int *sizec)
276 static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
280 /* Check address type match */
281 if ((addr[0] ^ range[0]) & 0x03000000)
284 /* Read address values, skipping high cell */
285 cp = of_read_addr(range + 1, na - 1);
286 s = of_read_addr(range + na + pna, ns);
287 da = of_read_addr(addr + 1, na - 1);
289 if (da < cp || da >= (cp + s))
294 static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
296 return of_bus_default_translate(addr + 1, offset, na - 1);
299 static unsigned int of_bus_pci_get_flags(u32 *addr)
301 unsigned int flags = 0;
304 switch((w >> 24) & 0x03) {
306 flags |= IORESOURCE_IO;
307 case 0x02: /* 32 bits */
308 case 0x03: /* 64 bits */
309 flags |= IORESOURCE_MEM;
312 flags |= IORESOURCE_PREFETCH;
317 * SBUS bus specific translator
320 static int of_bus_sbus_match(struct device_node *np)
322 return !strcmp(np->name, "sbus") ||
323 !strcmp(np->name, "sbi");
326 static void of_bus_sbus_count_cells(struct device_node *child,
327 int *addrc, int *sizec)
335 static u64 of_bus_sbus_map(u32 *addr, u32 *range, int na, int ns, int pna)
337 return of_bus_default_map(addr, range, na, ns, pna);
340 static int of_bus_sbus_translate(u32 *addr, u64 offset, int na)
342 return of_bus_default_translate(addr, offset, na);
345 static unsigned int of_bus_sbus_get_flags(u32 *addr)
347 return IORESOURCE_MEM;
352 * Array of bus specific translators
355 static struct of_bus of_busses[] = {
359 .addr_prop_name = "assigned-addresses",
360 .match = of_bus_pci_match,
361 .count_cells = of_bus_pci_count_cells,
362 .map = of_bus_pci_map,
363 .translate = of_bus_pci_translate,
364 .get_flags = of_bus_pci_get_flags,
369 .addr_prop_name = "reg",
370 .match = of_bus_sbus_match,
371 .count_cells = of_bus_sbus_count_cells,
372 .map = of_bus_sbus_map,
373 .translate = of_bus_sbus_translate,
374 .get_flags = of_bus_sbus_get_flags,
379 .addr_prop_name = "reg",
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,
388 static struct of_bus *of_match_bus(struct device_node *np)
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];
399 static int __init build_one_resource(struct device_node *parent,
403 int na, int ns, int pna)
408 u64 offset = OF_BAD_ADDR;
410 ranges = of_get_property(parent, "ranges", &rlen);
411 if (ranges == NULL || rlen == 0) {
412 offset = of_read_addr(addr, na);
413 memset(addr, 0, pna * 4);
417 /* Now walk through the ranges */
419 rone = na + pna + ns;
420 for (; rlen >= rone; rlen -= rone, ranges += rone) {
421 offset = bus->map(addr, ranges, na, ns, pna);
422 if (offset != OF_BAD_ADDR)
425 if (offset == OF_BAD_ADDR)
428 memcpy(addr, ranges + na, 4 * pna);
431 /* Translate it into parent bus space */
432 return pbus->translate(addr, offset, pna);
435 static void __init build_device_resources(struct of_device *op,
436 struct device *parent)
438 struct of_device *p_op;
447 p_op = to_of_device(parent);
448 bus = of_match_bus(p_op->node);
449 bus->count_cells(op->node, &na, &ns);
451 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
452 if (!preg || num_reg == 0)
455 /* Convert to num-cells. */
458 /* Conver to num-entries. */
461 for (index = 0; index < num_reg; index++) {
462 struct resource *r = &op->resource[index];
463 u32 addr[OF_MAX_ADDR_CELLS];
464 u32 *reg = (preg + (index * ((na + ns) * 4)));
465 struct device_node *dp = op->node;
466 struct device_node *pp = p_op->node;
468 u64 size, result = OF_BAD_ADDR;
473 size = of_read_addr(reg + na, ns);
474 flags = bus->get_flags(reg);
476 memcpy(addr, reg, na * 4);
478 /* If the immediate parent has no ranges property to apply,
479 * just use a 1<->1 mapping.
481 if (of_find_property(pp, "ranges", NULL) == NULL) {
482 result = of_read_addr(addr, na);
493 result = of_read_addr(addr, dna);
497 pbus = of_match_bus(pp);
498 pbus->count_cells(dp, &pna, &pns);
500 if (build_one_resource(dp, bus, pbus, addr, dna, dns, pna))
509 memset(r, 0, sizeof(*r));
510 if (result != OF_BAD_ADDR) {
511 r->start = result & 0xffffffff;
512 r->end = result + size - 1;
513 r->flags = flags | ((result >> 32ULL) & 0xffUL);
518 r->name = op->node->name;
522 static struct of_device * __init scan_one_device(struct device_node *dp,
523 struct device *parent)
525 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
526 struct linux_prom_irqs *intr;
534 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
536 op->portid = of_getintprop_default(dp, "upa-portid", -1);
537 if (op->portid == -1)
538 op->portid = of_getintprop_default(dp, "portid", -1);
540 intr = of_get_property(dp, "intr", &len);
542 op->num_irqs = len / sizeof(struct linux_prom_irqs);
543 for (i = 0; i < op->num_irqs; i++)
544 op->irqs[i] = intr[i].pri;
546 unsigned int *irq = of_get_property(dp, "interrupts", &len);
549 op->num_irqs = len / sizeof(unsigned int);
550 for (i = 0; i < op->num_irqs; i++)
551 op->irqs[i] = irq[i];
556 if (sparc_cpu_model == sun4d) {
557 static int pil_to_sbus[] = {
558 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
560 struct device_node *busp = dp->parent;
561 struct linux_prom_registers *regs;
562 int board = of_getintprop_default(busp, "board#", 0);
565 regs = of_get_property(dp, "reg", NULL);
566 slot = regs->which_io;
568 for (i = 0; i < op->num_irqs; i++) {
569 int this_irq = op->irqs[i];
570 int sbusl = pil_to_sbus[this_irq];
573 this_irq = (((board + 1) << 5) +
577 op->irqs[i] = this_irq;
581 build_device_resources(op, parent);
583 op->dev.parent = parent;
584 op->dev.bus = &of_bus_type;
586 strcpy(op->dev.bus_id, "root");
588 strcpy(op->dev.bus_id, dp->path_component_name);
590 if (of_device_register(op)) {
591 printk("%s: Could not register of device.\n",
600 static void __init scan_tree(struct device_node *dp, struct device *parent)
603 struct of_device *op = scan_one_device(dp, parent);
606 scan_tree(dp->child, &op->dev);
612 static void __init scan_of_devices(void)
614 struct device_node *root = of_find_node_by_path("/");
615 struct of_device *parent;
617 parent = scan_one_device(root, NULL);
621 scan_tree(root->child, &parent->dev);
624 static int __init of_bus_driver_init(void)
628 err = bus_register(&of_bus_type);
631 err = bus_register(&ebus_bus_type);
635 err = bus_register(&sbus_bus_type);
644 postcore_initcall(of_bus_driver_init);
646 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
648 /* initialize common driver fields */
649 drv->driver.name = drv->name;
650 drv->driver.bus = bus;
652 /* register with core */
653 return driver_register(&drv->driver);
656 void of_unregister_driver(struct of_platform_driver *drv)
658 driver_unregister(&drv->driver);
662 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
664 struct of_device *ofdev;
666 ofdev = to_of_device(dev);
667 return sprintf(buf, "%s", ofdev->node->full_name);
670 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
673 * of_release_dev - free an of device structure when all users of it are finished.
674 * @dev: device that's been disconnected
676 * Will be called only by the device core when all users of this of device are
679 void of_release_dev(struct device *dev)
681 struct of_device *ofdev;
683 ofdev = to_of_device(dev);
688 int of_device_register(struct of_device *ofdev)
692 BUG_ON(ofdev->node == NULL);
694 rc = device_register(&ofdev->dev);
698 device_create_file(&ofdev->dev, &dev_attr_devspec);
703 void of_device_unregister(struct of_device *ofdev)
705 device_remove_file(&ofdev->dev, &dev_attr_devspec);
706 device_unregister(&ofdev->dev);
709 struct of_device* of_platform_device_create(struct device_node *np,
711 struct device *parent,
712 struct bus_type *bus)
714 struct of_device *dev;
716 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
719 memset(dev, 0, sizeof(*dev));
721 dev->dev.parent = parent;
723 dev->dev.release = of_release_dev;
725 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
727 if (of_device_register(dev) != 0) {
735 EXPORT_SYMBOL(of_match_device);
736 EXPORT_SYMBOL(of_register_driver);
737 EXPORT_SYMBOL(of_unregister_driver);
738 EXPORT_SYMBOL(of_device_register);
739 EXPORT_SYMBOL(of_device_unregister);
740 EXPORT_SYMBOL(of_dev_get);
741 EXPORT_SYMBOL(of_dev_put);
742 EXPORT_SYMBOL(of_platform_device_create);
743 EXPORT_SYMBOL(of_release_dev);