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127 lines
2.7 KiB
127 lines
2.7 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 <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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