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(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 u64 (*map
)(u32
*addr
, u32
*range
, int na
, int ns
, int pna
);
240 int (*translate
)(u32
*addr
, u64 offset
, int na
);
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 static u64
of_bus_default_map(u32
*addr
, u32
*range
, int na
, int ns
, int pna
)
258 cp
= of_read_addr(range
, na
);
259 s
= of_read_addr(range
+ na
+ pna
, ns
);
260 da
= of_read_addr(addr
, na
);
262 if (da
< cp
|| da
>= (cp
+ s
))
267 static int of_bus_default_translate(u32
*addr
, u64 offset
, int na
)
269 u64 a
= of_read_addr(addr
, na
);
270 memset(addr
, 0, na
* 4);
273 addr
[na
- 2] = a
>> 32;
274 addr
[na
- 1] = a
& 0xffffffffu
;
279 static unsigned int of_bus_default_get_flags(u32
*addr
)
281 return IORESOURCE_MEM
;
285 * PCI bus specific translator
288 static int of_bus_pci_match(struct device_node
*np
)
290 return !strcmp(np
->type
, "pci") || !strcmp(np
->type
, "pciex");
293 static void of_bus_pci_count_cells(struct device_node
*np
,
294 int *addrc
, int *sizec
)
302 static u64
of_bus_pci_map(u32
*addr
, u32
*range
, int na
, int ns
, int pna
)
306 /* Check address type match */
307 if ((addr
[0] ^ range
[0]) & 0x03000000)
310 /* Read address values, skipping high cell */
311 cp
= of_read_addr(range
+ 1, na
- 1);
312 s
= of_read_addr(range
+ na
+ pna
, ns
);
313 da
= of_read_addr(addr
+ 1, na
- 1);
315 if (da
< cp
|| da
>= (cp
+ s
))
320 static int of_bus_pci_translate(u32
*addr
, u64 offset
, int na
)
322 return of_bus_default_translate(addr
+ 1, offset
, na
- 1);
325 static unsigned int of_bus_pci_get_flags(u32
*addr
)
327 unsigned int flags
= 0;
330 switch((w
>> 24) & 0x03) {
332 flags
|= IORESOURCE_IO
;
333 case 0x02: /* 32 bits */
334 case 0x03: /* 64 bits */
335 flags
|= IORESOURCE_MEM
;
338 flags
|= IORESOURCE_PREFETCH
;
343 * ISA bus specific translator
346 static int of_bus_isa_match(struct device_node
*np
)
348 return !strcmp(np
->name
, "isa");
351 static void of_bus_isa_count_cells(struct device_node
*child
,
352 int *addrc
, int *sizec
)
360 static u64
of_bus_isa_map(u32
*addr
, u32
*range
, int na
, int ns
, int pna
)
364 /* Check address type match */
365 if ((addr
[0] ^ range
[0]) & 0x00000001)
368 /* Read address values, skipping high cell */
369 cp
= of_read_addr(range
+ 1, na
- 1);
370 s
= of_read_addr(range
+ na
+ pna
, ns
);
371 da
= of_read_addr(addr
+ 1, na
- 1);
373 if (da
< cp
|| da
>= (cp
+ s
))
378 static int of_bus_isa_translate(u32
*addr
, u64 offset
, int na
)
380 return of_bus_default_translate(addr
+ 1, offset
, na
- 1);
383 static unsigned int of_bus_isa_get_flags(u32
*addr
)
385 unsigned int flags
= 0;
389 flags
|= IORESOURCE_IO
;
391 flags
|= IORESOURCE_MEM
;
396 * SBUS bus specific translator
399 static int of_bus_sbus_match(struct device_node
*np
)
401 return !strcmp(np
->name
, "sbus") ||
402 !strcmp(np
->name
, "sbi");
405 static void of_bus_sbus_count_cells(struct device_node
*child
,
406 int *addrc
, int *sizec
)
414 static u64
of_bus_sbus_map(u32
*addr
, u32
*range
, int na
, int ns
, int pna
)
416 return of_bus_default_map(addr
, range
, na
, ns
, pna
);
419 static int of_bus_sbus_translate(u32
*addr
, u64 offset
, int na
)
421 return of_bus_default_translate(addr
, offset
, na
);
424 static unsigned int of_bus_sbus_get_flags(u32
*addr
)
426 return IORESOURCE_MEM
;
431 * Array of bus specific translators
434 static struct of_bus of_busses
[] = {
438 .addr_prop_name
= "assigned-addresses",
439 .match
= of_bus_pci_match
,
440 .count_cells
= of_bus_pci_count_cells
,
441 .map
= of_bus_pci_map
,
442 .translate
= of_bus_pci_translate
,
443 .get_flags
= of_bus_pci_get_flags
,
448 .addr_prop_name
= "reg",
449 .match
= of_bus_isa_match
,
450 .count_cells
= of_bus_isa_count_cells
,
451 .map
= of_bus_isa_map
,
452 .translate
= of_bus_isa_translate
,
453 .get_flags
= of_bus_isa_get_flags
,
458 .addr_prop_name
= "reg",
459 .match
= of_bus_sbus_match
,
460 .count_cells
= of_bus_sbus_count_cells
,
461 .map
= of_bus_sbus_map
,
462 .translate
= of_bus_sbus_translate
,
463 .get_flags
= of_bus_sbus_get_flags
,
468 .addr_prop_name
= "reg",
470 .count_cells
= of_bus_default_count_cells
,
471 .map
= of_bus_default_map
,
472 .translate
= of_bus_default_translate
,
473 .get_flags
= of_bus_default_get_flags
,
477 static struct of_bus
*of_match_bus(struct device_node
*np
)
481 for (i
= 0; i
< ARRAY_SIZE(of_busses
); i
++)
482 if (!of_busses
[i
].match
|| of_busses
[i
].match(np
))
483 return &of_busses
[i
];
488 static int __init
build_one_resource(struct device_node
*parent
,
492 int na
, int ns
, int pna
)
497 u64 offset
= OF_BAD_ADDR
;
499 ranges
= of_get_property(parent
, "ranges", &rlen
);
500 if (ranges
== NULL
|| rlen
== 0) {
501 offset
= of_read_addr(addr
, na
);
502 memset(addr
, 0, pna
* 4);
506 /* Now walk through the ranges */
508 rone
= na
+ pna
+ ns
;
509 for (; rlen
>= rone
; rlen
-= rone
, ranges
+= rone
) {
510 offset
= bus
->map(addr
, ranges
, na
, ns
, pna
);
511 if (offset
!= OF_BAD_ADDR
)
514 if (offset
== OF_BAD_ADDR
)
517 memcpy(addr
, ranges
+ na
, 4 * pna
);
520 /* Translate it into parent bus space */
521 return pbus
->translate(addr
, offset
, pna
);
524 static void __init
build_device_resources(struct of_device
*op
,
525 struct device
*parent
)
527 struct of_device
*p_op
;
536 p_op
= to_of_device(parent
);
537 bus
= of_match_bus(p_op
->node
);
538 bus
->count_cells(op
->node
, &na
, &ns
);
540 preg
= of_get_property(op
->node
, bus
->addr_prop_name
, &num_reg
);
541 if (!preg
|| num_reg
== 0)
544 /* Convert to num-cells. */
547 /* Conver to num-entries. */
550 for (index
= 0; index
< num_reg
; index
++) {
551 struct resource
*r
= &op
->resource
[index
];
552 u32 addr
[OF_MAX_ADDR_CELLS
];
553 u32
*reg
= (preg
+ (index
* ((na
+ ns
) * 4)));
554 struct device_node
*dp
= op
->node
;
555 struct device_node
*pp
= p_op
->node
;
557 u64 size
, result
= OF_BAD_ADDR
;
562 size
= of_read_addr(reg
+ na
, ns
);
563 flags
= bus
->get_flags(reg
);
565 memcpy(addr
, reg
, na
* 4);
567 /* If the immediate parent has no ranges property to apply,
568 * just use a 1<->1 mapping. Unless it is the 'dma' child
569 * of an isa bus, which must be passed up towards the root.
571 * Also, don't try to translate PMU bus device registers.
573 if ((of_find_property(pp
, "ranges", NULL
) == NULL
&&
574 strcmp(pp
->name
, "dma") != 0) ||
575 !strcmp(pp
->name
, "pmu")) {
576 result
= of_read_addr(addr
, na
);
587 result
= of_read_addr(addr
, dna
);
591 pbus
= of_match_bus(pp
);
592 pbus
->count_cells(dp
, &pna
, &pns
);
594 if (build_one_resource(dp
, bus
, pbus
, addr
, dna
, dns
, pna
))
603 memset(r
, 0, sizeof(*r
));
604 if (result
!= OF_BAD_ADDR
) {
605 if (tlb_type
== hypervisor
)
606 result
&= 0x0fffffffffffffffUL
;
609 r
->end
= result
+ size
- 1;
615 r
->name
= op
->node
->name
;
619 static struct device_node
* __init
620 apply_interrupt_map(struct device_node
*dp
, struct device_node
*pp
,
621 u32
*imap
, int imlen
, u32
*imask
,
624 struct device_node
*cp
;
625 unsigned int irq
= *irq_p
;
631 bus
= of_match_bus(pp
);
632 bus
->count_cells(dp
, &na
, NULL
);
634 reg
= of_get_property(dp
, "reg", &num_reg
);
635 if (!reg
|| !num_reg
)
638 imlen
/= ((na
+ 3) * 4);
640 for (i
= 0; i
< imlen
; i
++) {
643 for (j
= 0; j
< na
; j
++) {
644 if ((reg
[j
] & imask
[j
]) != imap
[j
])
647 if (imap
[na
] == irq
) {
648 handle
= imap
[na
+ 1];
660 cp
= of_find_node_by_phandle(handle
);
665 static unsigned int __init
pci_irq_swizzle(struct device_node
*dp
,
666 struct device_node
*pp
,
669 struct linux_prom_pci_registers
*regs
;
670 unsigned int devfn
, slot
, ret
;
672 if (irq
< 1 || irq
> 4)
675 regs
= of_get_property(dp
, "reg", NULL
);
679 devfn
= (regs
->phys_hi
>> 8) & 0xff;
680 slot
= (devfn
>> 3) & 0x1f;
682 ret
= ((irq
- 1 + (slot
& 3)) & 3) + 1;
687 static unsigned int __init
build_one_device_irq(struct of_device
*op
,
688 struct device
*parent
,
691 struct device_node
*dp
= op
->node
;
692 struct device_node
*pp
, *ip
;
693 unsigned int orig_irq
= irq
;
695 if (irq
== 0xffffffff)
699 irq
= dp
->irq_trans
->irq_build(dp
, irq
,
700 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
,
732 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
734 pp
->full_name
, this_orig_irq
,
735 (iret
? iret
->full_name
: "NULL"), irq
);
740 if (iret
->irq_trans
) {
745 if (!strcmp(pp
->type
, "pci") ||
746 !strcmp(pp
->type
, "pciex")) {
747 unsigned int this_orig_irq
= irq
;
749 irq
= pci_irq_swizzle(dp
, pp
, irq
);
751 printk("%s: PCI swizzle [%s] %x --> %x\n",
753 pp
->full_name
, this_orig_irq
, irq
);
768 irq
= ip
->irq_trans
->irq_build(op
->node
, irq
,
769 ip
->irq_trans
->data
);
771 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
772 op
->node
->full_name
, ip
->full_name
, orig_irq
, irq
);
778 static struct of_device
* __init
scan_one_device(struct device_node
*dp
,
779 struct device
*parent
)
781 struct of_device
*op
= kzalloc(sizeof(*op
), GFP_KERNEL
);
790 op
->clock_freq
= of_getintprop_default(dp
, "clock-frequency",
792 op
->portid
= of_getintprop_default(dp
, "upa-portid", -1);
793 if (op
->portid
== -1)
794 op
->portid
= of_getintprop_default(dp
, "portid", -1);
796 irq
= of_get_property(dp
, "interrupts", &len
);
798 memcpy(op
->irqs
, irq
, len
);
799 op
->num_irqs
= len
/ 4;
804 build_device_resources(op
, parent
);
805 for (i
= 0; i
< op
->num_irqs
; i
++)
806 op
->irqs
[i
] = build_one_device_irq(op
, parent
, op
->irqs
[i
]);
808 op
->dev
.parent
= parent
;
809 op
->dev
.bus
= &of_bus_type
;
811 strcpy(op
->dev
.bus_id
, "root");
813 strcpy(op
->dev
.bus_id
, dp
->path_component_name
);
815 if (of_device_register(op
)) {
816 printk("%s: Could not register of device.\n",
825 static void __init
scan_tree(struct device_node
*dp
, struct device
*parent
)
828 struct of_device
*op
= scan_one_device(dp
, parent
);
831 scan_tree(dp
->child
, &op
->dev
);
837 static void __init
scan_of_devices(void)
839 struct device_node
*root
= of_find_node_by_path("/");
840 struct of_device
*parent
;
842 parent
= scan_one_device(root
, NULL
);
846 scan_tree(root
->child
, &parent
->dev
);
849 static int __init
of_bus_driver_init(void)
853 err
= bus_register(&of_bus_type
);
856 err
= bus_register(&isa_bus_type
);
858 err
= bus_register(&ebus_bus_type
);
862 err
= bus_register(&sbus_bus_type
);
871 postcore_initcall(of_bus_driver_init
);
873 int of_register_driver(struct of_platform_driver
*drv
, struct bus_type
*bus
)
875 /* initialize common driver fields */
876 drv
->driver
.name
= drv
->name
;
877 drv
->driver
.bus
= bus
;
879 /* register with core */
880 return driver_register(&drv
->driver
);
883 void of_unregister_driver(struct of_platform_driver
*drv
)
885 driver_unregister(&drv
->driver
);
889 static ssize_t
dev_show_devspec(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
891 struct of_device
*ofdev
;
893 ofdev
= to_of_device(dev
);
894 return sprintf(buf
, "%s", ofdev
->node
->full_name
);
897 static DEVICE_ATTR(devspec
, S_IRUGO
, dev_show_devspec
, NULL
);
900 * of_release_dev - free an of device structure when all users of it are finished.
901 * @dev: device that's been disconnected
903 * Will be called only by the device core when all users of this of device are
906 void of_release_dev(struct device
*dev
)
908 struct of_device
*ofdev
;
910 ofdev
= to_of_device(dev
);
915 int of_device_register(struct of_device
*ofdev
)
919 BUG_ON(ofdev
->node
== NULL
);
921 rc
= device_register(&ofdev
->dev
);
925 device_create_file(&ofdev
->dev
, &dev_attr_devspec
);
930 void of_device_unregister(struct of_device
*ofdev
)
932 device_remove_file(&ofdev
->dev
, &dev_attr_devspec
);
933 device_unregister(&ofdev
->dev
);
936 struct of_device
* of_platform_device_create(struct device_node
*np
,
938 struct device
*parent
,
939 struct bus_type
*bus
)
941 struct of_device
*dev
;
943 dev
= kmalloc(sizeof(*dev
), GFP_KERNEL
);
946 memset(dev
, 0, sizeof(*dev
));
948 dev
->dev
.parent
= parent
;
950 dev
->dev
.release
= of_release_dev
;
952 strlcpy(dev
->dev
.bus_id
, bus_id
, BUS_ID_SIZE
);
954 if (of_device_register(dev
) != 0) {
962 EXPORT_SYMBOL(of_match_device
);
963 EXPORT_SYMBOL(of_register_driver
);
964 EXPORT_SYMBOL(of_unregister_driver
);
965 EXPORT_SYMBOL(of_device_register
);
966 EXPORT_SYMBOL(of_device_unregister
);
967 EXPORT_SYMBOL(of_dev_get
);
968 EXPORT_SYMBOL(of_dev_put
);
969 EXPORT_SYMBOL(of_platform_device_create
);
970 EXPORT_SYMBOL(of_release_dev
);