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98 lines
2.2 KiB
98 lines
2.2 KiB
/* |
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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 <[email protected]> |
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* Copyright (C) 2008 Florian Fainelli <[email protected]> |
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* Copyright (C) 2012 Jonas Gorski <[email protected]> |
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*/ |
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#define pr_fmt(fmt) "bcm63xx_nvram: " fmt |
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#include <linux/bcm963xx_nvram.h> |
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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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#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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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, BCM963XX_NVRAM_V5_SIZE); |
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/* check checksum before using data */ |
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if (bcm963xx_nvram_checksum(&nvram, &expected_crc, &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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