mirror of https://gitee.com/openkylin/linux.git
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_pci.h>
|
|
#include <asm/prom.h>
|
|
|
|
static inline int __of_pci_pci_compare(struct device_node *node,
|
|
unsigned int devfn)
|
|
{
|
|
unsigned int size;
|
|
const __be32 *reg = of_get_property(node, "reg", &size);
|
|
|
|
if (!reg || size < 5 * sizeof(__be32))
|
|
return 0;
|
|
return ((be32_to_cpup(®[0]) >> 8) & 0xff) == devfn;
|
|
}
|
|
|
|
struct device_node *of_pci_find_child_device(struct device_node *parent,
|
|
unsigned int devfn)
|
|
{
|
|
struct device_node *node, *node2;
|
|
|
|
for_each_child_of_node(parent, node) {
|
|
if (__of_pci_pci_compare(node, devfn))
|
|
return node;
|
|
/*
|
|
* Some OFs create a parent node "multifunc-device" as
|
|
* a fake root for all functions of a multi-function
|
|
* device we go down them as well.
|
|
*/
|
|
if (!strcmp(node->name, "multifunc-device")) {
|
|
for_each_child_of_node(node, node2) {
|
|
if (__of_pci_pci_compare(node2, devfn)) {
|
|
of_node_put(node);
|
|
return node2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_find_child_device);
|