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 #define BCM63XX_DEFAULT_PSI_SIZE 64 23 24 static struct bcm963xx_nvram nvram; 25 static int mac_addr_used; 26 27 void __init bcm63xx_nvram_init(void *addr) 28 { 29 u32 crc, expected_crc; 30 u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff }; 31 32 /* extract nvram data */ 33 memcpy(&nvram, addr, BCM963XX_NVRAM_V5_SIZE); 34 35 /* check checksum before using data */ 36 if (bcm963xx_nvram_checksum(&nvram, &expected_crc, &crc)) 37 pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n", 38 expected_crc, crc); 39 40 /* Cable modems have a different NVRAM which is embedded in the eCos 41 * firmware and not easily extractible, give at least a MAC address 42 * pool. 43 */ 44 if (BCMCPU_IS_3368()) { 45 memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN); 46 nvram.mac_addr_count = 2; 47 } 48 } 49 50 u8 *bcm63xx_nvram_get_name(void) 51 { 52 return nvram.name; 53 } 54 EXPORT_SYMBOL(bcm63xx_nvram_get_name); 55 56 int bcm63xx_nvram_get_mac_address(u8 *mac) 57 { 58 u8 *oui; 59 int count; 60 61 if (mac_addr_used >= nvram.mac_addr_count) { 62 pr_err("not enough mac addresses\n"); 63 return -ENODEV; 64 } 65 66 memcpy(mac, nvram.mac_addr_base, ETH_ALEN); 67 oui = mac + ETH_ALEN/2 - 1; 68 count = mac_addr_used; 69 70 while (count--) { 71 u8 *p = mac + ETH_ALEN - 1; 72 73 do { 74 (*p)++; 75 if (*p != 0) 76 break; 77 p--; 78 } while (p != oui); 79 80 if (p == oui) { 81 pr_err("unable to fetch mac address\n"); 82 return -ENODEV; 83 } 84 } 85 86 mac_addr_used++; 87 return 0; 88 } 89 EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address); 90 91 int bcm63xx_nvram_get_psi_size(void) 92 { 93 if (nvram.psi_size > 0) 94 return nvram.psi_size; 95 96 return BCM63XX_DEFAULT_PSI_SIZE; 97 } 98 EXPORT_SYMBOL(bcm63xx_nvram_get_psi_size); 99