From: Thierry Reding <treding@nvidia.com>
Date: Tue, 26 Aug 2014 15:33:54 +0000 (+0200)
Subject: fdt: Add a function to return PCI BDF triplet
X-Git-Tag: v2015.01-rc1~207^2~1
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=9f85eee72a2a3918b2d5cd7b1bf88da69232dede;p=oweals%2Fu-boot.git

fdt: Add a function to return PCI BDF triplet

The fdtdec_pci_get_bdf() function returns the bus, device, function
triplet of a PCI device by parsing the "reg" property according to the
PCI device tree binding.

Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 8b24deb767..99cb353804 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 b3c43be89d..4f66ae172f 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