1 #include <linux/kernel.h>
2 #include <linux/export.h>
4 #include <linux/of_pci.h>
7 static inline int __of_pci_pci_compare(struct device_node
*node
,
12 devfn
= of_pci_get_devfn(node
);
19 struct device_node
*of_pci_find_child_device(struct device_node
*parent
,
22 struct device_node
*node
, *node2
;
24 for_each_child_of_node(parent
, node
) {
25 if (__of_pci_pci_compare(node
, devfn
))
28 * Some OFs create a parent node "multifunc-device" as
29 * a fake root for all functions of a multi-function
30 * device we go down them as well.
32 if (!strcmp(node
->name
, "multifunc-device")) {
33 for_each_child_of_node(node
, node2
) {
34 if (__of_pci_pci_compare(node2
, devfn
)) {
43 EXPORT_SYMBOL_GPL(of_pci_find_child_device
);
46 * of_pci_get_devfn() - Get device and function numbers for a device node
49 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
50 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
51 * and function numbers respectively. On error a negative error code is
54 int of_pci_get_devfn(struct device_node
*np
)
59 reg
= of_get_property(np
, "reg", &size
);
61 if (!reg
|| size
< 5 * sizeof(__be32
))
64 return (be32_to_cpup(reg
) >> 8) & 0xff;
66 EXPORT_SYMBOL_GPL(of_pci_get_devfn
);
69 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
71 * @res: address to a struct resource to return the bus-range
73 * Returns 0 on success or a negative error-code on failure.
75 int of_pci_parse_bus_range(struct device_node
*node
, struct resource
*res
)
80 values
= of_get_property(node
, "bus-range", &len
);
81 if (!values
|| len
< sizeof(*values
) * 2)
84 res
->name
= node
->name
;
85 res
->start
= be32_to_cpup(values
++);
86 res
->end
= be32_to_cpup(values
);
87 res
->flags
= IORESOURCE_BUS
;
91 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range
);