128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
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* Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
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*/
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#define pr_fmt(fmt) "bcm63xx_nvram: " fmt
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#include <linux/init.h>
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#include <linux/crc32.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/if_ether.h>
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#include <bcm63xx_nvram.h>
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/*
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* nvram structure
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*/
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struct bcm963xx_nvram {
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u32 version;
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u8 reserved1[256];
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u8 name[16];
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u32 main_tp_number;
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u32 psi_size;
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u32 mac_addr_count;
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u8 mac_addr_base[ETH_ALEN];
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u8 reserved2[2];
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u32 checksum_old;
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u8 reserved3[720];
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u32 checksum_high;
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};
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#define BCM63XX_DEFAULT_PSI_SIZE 64
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static struct bcm963xx_nvram nvram;
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static int mac_addr_used;
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void __init bcm63xx_nvram_init(void *addr)
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{
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unsigned int check_len;
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u32 crc, expected_crc;
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u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff };
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/* extract nvram data */
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memcpy(&nvram, addr, sizeof(nvram));
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/* check checksum before using data */
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if (nvram.version <= 4) {
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check_len = offsetof(struct bcm963xx_nvram, reserved3);
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expected_crc = nvram.checksum_old;
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nvram.checksum_old = 0;
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} else {
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check_len = sizeof(nvram);
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expected_crc = nvram.checksum_high;
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nvram.checksum_high = 0;
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}
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crc = crc32_le(~0, (u8 *)&nvram, check_len);
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if (crc != expected_crc)
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pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
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expected_crc, crc);
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/* Cable modems have a different NVRAM which is embedded in the eCos
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* firmware and not easily extractible, give at least a MAC address
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* pool.
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*/
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if (BCMCPU_IS_3368()) {
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memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN);
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nvram.mac_addr_count = 2;
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}
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}
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u8 *bcm63xx_nvram_get_name(void)
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{
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return nvram.name;
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}
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EXPORT_SYMBOL(bcm63xx_nvram_get_name);
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int bcm63xx_nvram_get_mac_address(u8 *mac)
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{
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u8 *oui;
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int count;
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if (mac_addr_used >= nvram.mac_addr_count) {
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pr_err("not enough mac addresses\n");
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return -ENODEV;
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}
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memcpy(mac, nvram.mac_addr_base, ETH_ALEN);
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oui = mac + ETH_ALEN/2 - 1;
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count = mac_addr_used;
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while (count--) {
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u8 *p = mac + ETH_ALEN - 1;
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do {
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(*p)++;
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if (*p != 0)
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break;
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p--;
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} while (p != oui);
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if (p == oui) {
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pr_err("unable to fetch mac address\n");
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return -ENODEV;
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}
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}
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mac_addr_used++;
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return 0;
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}
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EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);
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int bcm63xx_nvram_get_psi_size(void)
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{
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if (nvram.psi_size > 0)
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return nvram.psi_size;
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return BCM63XX_DEFAULT_PSI_SIZE;
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}
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EXPORT_SYMBOL(bcm63xx_nvram_get_psi_size);
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