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);
133 struct bus_type ebus_bus_type = {
135 .match = of_platform_bus_match,
136 .probe = of_device_probe,
137 .remove = of_device_remove,
138 .suspend = of_device_suspend,
139 .resume = of_device_resume,
141 EXPORT_SYMBOL(ebus_bus_type);
145 struct bus_type sbus_bus_type = {
147 .match = of_platform_bus_match,
148 .probe = of_device_probe,
149 .remove = of_device_remove,
150 .suspend = of_device_suspend,
151 .resume = of_device_resume,
153 EXPORT_SYMBOL(sbus_bus_type);
156 struct bus_type of_bus_type = {
158 .match = of_platform_bus_match,
159 .probe = of_device_probe,
160 .remove = of_device_remove,
161 .suspend = of_device_suspend,
162 .resume = of_device_resume,
164 EXPORT_SYMBOL(of_bus_type);
166 static inline u64 of_read_addr(u32 *cell, int size)
170 r = (r << 32) | *(cell++);
174 static void __init get_cells(struct device_node *dp,
175 int *addrc, int *sizec)
178 *addrc = of_n_addr_cells(dp);
180 *sizec = of_n_size_cells(dp);
183 /* Max address size we deal with */
184 #define OF_MAX_ADDR_CELLS 4
188 const char *addr_prop_name;
189 int (*match)(struct device_node *parent);
190 void (*count_cells)(struct device_node *child,
191 int *addrc, int *sizec);
192 u64 (*map)(u32 *addr, u32 *range, int na, int ns, int pna);
193 int (*translate)(u32 *addr, u64 offset, int na);
194 unsigned int (*get_flags)(u32 *addr);
198 * Default translator (generic bus)
201 static void of_bus_default_count_cells(struct device_node *dev,
202 int *addrc, int *sizec)
204 get_cells(dev, addrc, sizec);
207 static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
211 cp = of_read_addr(range, na);
212 s = of_read_addr(range + na + pna, ns);
213 da = of_read_addr(addr, na);
215 if (da < cp || da >= (cp + s))
220 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
222 u64 a = of_read_addr(addr, na);
223 memset(addr, 0, na * 4);
226 addr[na - 2] = a >> 32;
227 addr[na - 1] = a & 0xffffffffu;
232 static unsigned int of_bus_default_get_flags(u32 *addr)
234 return IORESOURCE_MEM;
239 * PCI bus specific translator
242 static int of_bus_pci_match(struct device_node *np)
244 return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex");
247 static void of_bus_pci_count_cells(struct device_node *np,
248 int *addrc, int *sizec)
256 static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
260 /* Check address type match */
261 if ((addr[0] ^ range[0]) & 0x03000000)
264 /* Read address values, skipping high cell */
265 cp = of_read_addr(range + 1, na - 1);
266 s = of_read_addr(range + na + pna, ns);
267 da = of_read_addr(addr + 1, na - 1);
269 if (da < cp || da >= (cp + s))
274 static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
276 return of_bus_default_translate(addr + 1, offset, na - 1);
279 static unsigned int of_bus_pci_get_flags(u32 *addr)
281 unsigned int flags = 0;
284 switch((w >> 24) & 0x03) {
286 flags |= IORESOURCE_IO;
287 case 0x02: /* 32 bits */
288 case 0x03: /* 64 bits */
289 flags |= IORESOURCE_MEM;
292 flags |= IORESOURCE_PREFETCH;
297 * SBUS bus specific translator
300 static int of_bus_sbus_match(struct device_node *np)
302 return !strcmp(np->name, "sbus") ||
303 !strcmp(np->name, "sbi");
306 static void of_bus_sbus_count_cells(struct device_node *child,
307 int *addrc, int *sizec)
315 static u64 of_bus_sbus_map(u32 *addr, u32 *range, int na, int ns, int pna)
317 return of_bus_default_map(addr, range, na, ns, pna);
320 static int of_bus_sbus_translate(u32 *addr, u64 offset, int na)
322 return of_bus_default_translate(addr, offset, na);
325 static unsigned int of_bus_sbus_get_flags(u32 *addr)
327 return IORESOURCE_MEM;
332 * Array of bus specific translators
335 static struct of_bus of_busses[] = {
339 .addr_prop_name = "assigned-addresses",
340 .match = of_bus_pci_match,
341 .count_cells = of_bus_pci_count_cells,
342 .map = of_bus_pci_map,
343 .translate = of_bus_pci_translate,
344 .get_flags = of_bus_pci_get_flags,
349 .addr_prop_name = "reg",
350 .match = of_bus_sbus_match,
351 .count_cells = of_bus_sbus_count_cells,
352 .map = of_bus_sbus_map,
353 .translate = of_bus_sbus_translate,
354 .get_flags = of_bus_sbus_get_flags,
359 .addr_prop_name = "reg",
361 .count_cells = of_bus_default_count_cells,
362 .map = of_bus_default_map,
363 .translate = of_bus_default_translate,
364 .get_flags = of_bus_default_get_flags,
368 static struct of_bus *of_match_bus(struct device_node *np)
372 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
373 if (!of_busses[i].match || of_busses[i].match(np))
374 return &of_busses[i];
379 static int __init build_one_resource(struct device_node *parent,
383 int na, int ns, int pna)
388 u64 offset = OF_BAD_ADDR;
390 ranges = of_get_property(parent, "ranges", &rlen);
391 if (ranges == NULL || rlen == 0) {
392 offset = of_read_addr(addr, na);
393 memset(addr, 0, pna * 4);
397 /* Now walk through the ranges */
399 rone = na + pna + ns;
400 for (; rlen >= rone; rlen -= rone, ranges += rone) {
401 offset = bus->map(addr, ranges, na, ns, pna);
402 if (offset != OF_BAD_ADDR)
405 if (offset == OF_BAD_ADDR)
408 memcpy(addr, ranges + na, 4 * pna);
411 /* Translate it into parent bus space */
412 return pbus->translate(addr, offset, pna);
415 static void __init build_device_resources(struct of_device *op,
416 struct device *parent)
418 struct of_device *p_op;
427 p_op = to_of_device(parent);
428 bus = of_match_bus(p_op->node);
429 bus->count_cells(op->node, &na, &ns);
431 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
432 if (!preg || num_reg == 0)
435 /* Convert to num-cells. */
438 /* Conver to num-entries. */
441 for (index = 0; index < num_reg; index++) {
442 struct resource *r = &op->resource[index];
443 u32 addr[OF_MAX_ADDR_CELLS];
444 u32 *reg = (preg + (index * ((na + ns) * 4)));
445 struct device_node *dp = op->node;
446 struct device_node *pp = p_op->node;
448 u64 size, result = OF_BAD_ADDR;
453 size = of_read_addr(reg + na, ns);
454 flags = bus->get_flags(reg);
456 memcpy(addr, reg, na * 4);
458 /* If the immediate parent has no ranges property to apply,
459 * just use a 1<->1 mapping.
461 if (of_find_property(pp, "ranges", NULL) == NULL) {
462 result = of_read_addr(addr, na);
473 result = of_read_addr(addr, dna);
477 pbus = of_match_bus(pp);
478 pbus->count_cells(dp, &pna, &pns);
480 if (build_one_resource(dp, bus, pbus, addr, dna, dns, pna))
489 memset(r, 0, sizeof(*r));
490 if (result != OF_BAD_ADDR) {
491 r->start = result & 0xffffffff;
492 r->end = result + size - 1;
493 r->flags = flags | ((result >> 32ULL) & 0xffUL);
498 r->name = op->node->name;
502 static struct of_device * __init scan_one_device(struct device_node *dp,
503 struct device *parent)
505 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
514 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
516 op->portid = of_getintprop_default(dp, "upa-portid", -1);
517 if (op->portid == -1)
518 op->portid = of_getintprop_default(dp, "portid", -1);
520 irq = of_get_property(dp, "interrupts", &len);
524 op->irq = 0xffffffff;
526 build_device_resources(op, parent);
528 op->dev.parent = parent;
529 op->dev.bus = &of_bus_type;
531 strcpy(op->dev.bus_id, "root");
533 strcpy(op->dev.bus_id, dp->path_component_name);
535 if (of_device_register(op)) {
536 printk("%s: Could not register of device.\n",
545 static void __init scan_tree(struct device_node *dp, struct device *parent)
548 struct of_device *op = scan_one_device(dp, parent);
551 scan_tree(dp->child, &op->dev);
557 static void __init scan_of_devices(void)
559 struct device_node *root = of_find_node_by_path("/");
560 struct of_device *parent;
562 parent = scan_one_device(root, NULL);
566 scan_tree(root->child, &parent->dev);
569 static int __init of_bus_driver_init(void)
573 err = bus_register(&of_bus_type);
576 err = bus_register(&ebus_bus_type);
580 err = bus_register(&sbus_bus_type);
589 postcore_initcall(of_bus_driver_init);
591 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
593 /* initialize common driver fields */
594 drv->driver.name = drv->name;
595 drv->driver.bus = bus;
597 /* register with core */
598 return driver_register(&drv->driver);
601 void of_unregister_driver(struct of_platform_driver *drv)
603 driver_unregister(&drv->driver);
607 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
609 struct of_device *ofdev;
611 ofdev = to_of_device(dev);
612 return sprintf(buf, "%s", ofdev->node->full_name);
615 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
618 * of_release_dev - free an of device structure when all users of it are finished.
619 * @dev: device that's been disconnected
621 * Will be called only by the device core when all users of this of device are
624 void of_release_dev(struct device *dev)
626 struct of_device *ofdev;
628 ofdev = to_of_device(dev);
633 int of_device_register(struct of_device *ofdev)
637 BUG_ON(ofdev->node == NULL);
639 rc = device_register(&ofdev->dev);
643 device_create_file(&ofdev->dev, &dev_attr_devspec);
648 void of_device_unregister(struct of_device *ofdev)
650 device_remove_file(&ofdev->dev, &dev_attr_devspec);
651 device_unregister(&ofdev->dev);
654 struct of_device* of_platform_device_create(struct device_node *np,
656 struct device *parent,
657 struct bus_type *bus)
659 struct of_device *dev;
661 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
664 memset(dev, 0, sizeof(*dev));
666 dev->dev.parent = parent;
668 dev->dev.release = of_release_dev;
670 strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
672 if (of_device_register(dev) != 0) {
680 EXPORT_SYMBOL(of_match_device);
681 EXPORT_SYMBOL(of_register_driver);
682 EXPORT_SYMBOL(of_unregister_driver);
683 EXPORT_SYMBOL(of_device_register);
684 EXPORT_SYMBOL(of_device_unregister);
685 EXPORT_SYMBOL(of_dev_get);
686 EXPORT_SYMBOL(of_dev_put);
687 EXPORT_SYMBOL(of_platform_device_create);
688 EXPORT_SYMBOL(of_release_dev);