2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
8 * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
11 #define pr_fmt(fmt) "bcm63xx_nvram: " fmt
13 #include <linux/init.h>
14 #include <linux/crc32.h>
15 #include <linux/export.h>
16 #include <linux/kernel.h>
17 #include <linux/if_ether.h>
19 #include <bcm63xx_nvram.h>
24 struct bcm963xx_nvram {
31 u8 mac_addr_base[ETH_ALEN];
38 static struct bcm963xx_nvram nvram;
39 static int mac_addr_used;
41 void __init bcm63xx_nvram_init(void *addr)
43 unsigned int check_len;
44 u32 crc, expected_crc;
46 /* extract nvram data */
47 memcpy(&nvram, addr, sizeof(nvram));
49 /* check checksum before using data */
50 if (nvram.version <= 4) {
51 check_len = offsetof(struct bcm963xx_nvram, reserved3);
52 expected_crc = nvram.checksum_old;
53 nvram.checksum_old = 0;
55 check_len = sizeof(nvram);
56 expected_crc = nvram.checksum_high;
57 nvram.checksum_high = 0;
60 crc = crc32_le(~0, (u8 *)&nvram, check_len);
62 if (crc != expected_crc)
63 pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
67 u8 *bcm63xx_nvram_get_name(void)
71 EXPORT_SYMBOL(bcm63xx_nvram_get_name);
73 int bcm63xx_nvram_get_mac_address(u8 *mac)
78 if (mac_addr_used >= nvram.mac_addr_count) {
79 pr_err("not enough mac addresses\n");
83 memcpy(mac, nvram.mac_addr_base, ETH_ALEN);
84 oui = mac + ETH_ALEN/2 - 1;
85 count = mac_addr_used;
88 u8 *p = mac + ETH_ALEN - 1;
98 pr_err("unable to fetch mac address\n");
106 EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);