[PATCH 04/10] fdt_support: Implement fdt_ethernet_set_macaddr()
Alexandru Gagniuc
mr.nuke.me at gmail.com
Thu Aug 26 23:42:03 CEST 2021
Oftentimes we have MAC address information stored in a ROM or OTP. The
way to add that to the FDT would be through the u-boot environment,
and then fdt_fixup_ethernet(). This is not very useful in SPL.
It would be more helpful to be able to "set interface x to MAC y".
This is where fdt_ethernet_set_macaddr() comes in. It is similar in
function to fdt_fixup_ethernet(), but only updates one interface,
without using the u-boot env, and without string processing.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>
---
common/fdt_support.c | 30 ++++++++++++++++++++++++++++++
include/fdt_support.h | 17 +++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 4341d84bd5..c4cbd4060e 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -592,6 +592,36 @@ void fdt_fixup_ethernet(void *fdt)
}
}
+int fdt_ethernet_set_macaddr(void *fdt, int ethnum, const uint8_t *mac_addr)
+{
+ const char *path, *name;
+ int prop, aliases_node;
+ char eth_name[16] = "ethernet";
+
+ aliases_node = fdt_path_offset(fdt, "/aliases");
+ if (aliases_node < 0)
+ return aliases_node;
+
+ if (ethnum >= 0)
+ sprintf(eth_name, "ethernet%d", ethnum);
+
+ fdt_for_each_property_offset(prop, fdt, aliases_node) {
+ path = fdt_getprop_by_offset(fdt, prop, &name, NULL);
+ if (!strcmp(name, eth_name))
+ break;
+
+ path = NULL;
+ }
+
+ if (!path)
+ return -FDT_ERR_NOTFOUND;
+
+ do_fixup_by_path(fdt, path, "mac-address", mac_addr, 6, 0);
+ do_fixup_by_path(fdt, path, "local-mac-address", mac_addr, 6, 1);
+
+ return 0;
+}
+
int fdt_record_loadable(void *blob, u32 index, const char *name,
uintptr_t load_addr, u32 size, uintptr_t entry_point,
const char *type, const char *os, const char *arch)
diff --git a/include/fdt_support.h b/include/fdt_support.h
index f6f46bb8e9..3f0bcb5a00 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -119,6 +119,23 @@ static inline int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[],
#endif
void fdt_fixup_ethernet(void *fdt);
+
+/**
+ * Set the "mac-address" and "local-mac-address" of ethernet node
+ * The ethernet node is located from the "/aliases" section of the fdt. When
+ * 'ethnum' is positive, then the name is matched exactly, e.g "ethernet0".
+ * When ethnum is negative, the first ethernet alias is updated.
+ * Unlike fdt_fixup_ethernet(), this function only updates one ethernet node,
+ * and soes not use the "ethaddr" from the u-boot environment. This is useful,
+ * for example, in SPL, when the environment is not initialized or available.
+ *
+ * @param fdt FDT blob to update
+ * @param ethnum Ethernet device index, or negative for any ethernet
+ * @param mac_addr Pointer to 6-byte array containing the MAC address
+ *
+ * @return 0 if ok, or -FDT_ERR_... on error
+ */
+int fdt_ethernet_set_macaddr(void *fdt, int ethnum, const uint8_t *mac_addr);
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
const void *val, int len, int create);
void fdt_fixup_qe_firmware(void *fdt);
--
2.31.1
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