1 /* 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 4 * for more details. 5 * 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> 9 */ 10 11 #define pr_fmt(fmt) "bcm63xx_nvram: " fmt 12 13 #include <linux/bcm963xx_nvram.h> 14 #include <linux/init.h> 15 #include <linux/crc32.h> 16 #include <linux/export.h> 17 #include <linux/kernel.h> 18 #include <linux/if_ether.h> 19 20 #include <bcm63xx_nvram.h> 21 22 static struct bcm963xx_nvram nvram; 23 static int mac_addr_used; 24 25 void __init bcm63xx_nvram_init(void *addr) 26 { 27 u32 crc, expected_crc; 28 u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff }; 29 30 /* extract nvram data */ 31 memcpy(&nvram, addr, BCM963XX_NVRAM_V5_SIZE); 32 33 /* check checksum before using data */ 34 if (bcm963xx_nvram_checksum(&nvram, &expected_crc, &crc)) 35 pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n", 36 expected_crc, crc); 37 38 /* Cable modems have a different NVRAM which is embedded in the eCos 39 * firmware and not easily extractible, give at least a MAC address 40 * pool. 41 */ 42 if (BCMCPU_IS_3368()) { 43 memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN); 44 nvram.mac_addr_count = 2; 45 } 46 } 47 48 u8 *bcm63xx_nvram_get_name(void) 49 { 50 return nvram.name; 51 } 52 EXPORT_SYMBOL(bcm63xx_nvram_get_name); 53 54 int bcm63xx_nvram_get_mac_address(u8 *mac) 55 { 56 u8 *oui; 57 int count; 58 59 if (mac_addr_used >= nvram.mac_addr_count) { 60 pr_err("not enough mac addresses\n"); 61 return -ENODEV; 62 } 63 64 memcpy(mac, nvram.mac_addr_base, ETH_ALEN); 65 oui = mac + ETH_ALEN/2 - 1; 66 count = mac_addr_used; 67 68 while (count--) { 69 u8 *p = mac + ETH_ALEN - 1; 70 71 do { 72 (*p)++; 73 if (*p != 0) 74 break; 75 p--; 76 } while (p != oui); 77 78 if (p == oui) { 79 pr_err("unable to fetch mac address\n"); 80 return -ENODEV; 81 } 82 } 83 84 mac_addr_used++; 85 return 0; 86 } 87 EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address); 88