diff options
| -rw-r--r-- | include/fdtdec.h | 11 | ||||
| -rw-r--r-- | lib/fdtdec.c | 14 |
2 files changed, 25 insertions, 0 deletions
diff --git a/include/fdtdec.h b/include/fdtdec.h index 8b24deb..99cb353 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -649,4 +649,15 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property, const char *prop_names, const char *name, struct fdt_resource *res); +/** + * Look at the reg property of a device node that represents a PCI device + * and parse the bus, device and function number from it. + * + * @param fdt FDT blob + * @param node node to examine + * @param bdf returns bus, device, function triplet + * @return 0 if ok, negative on error + */ +int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf); + #endif diff --git a/lib/fdtdec.c b/lib/fdtdec.c index b3c43be..4f66ae1 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -765,4 +765,18 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property, return fdt_get_resource(fdt, node, property, index, res); } + +int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) +{ + const fdt32_t *prop; + int len; + + prop = fdt_getprop(fdt, node, "reg", &len); + if (!prop) + return len; + + *bdf = fdt32_to_cpu(*prop) & 0xffffff; + + return 0; +} #endif |