LXR linux/arch/mips/bcm63xx/nvram.c

   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
  24static struct bcm963xx_nvram nvram;
  25static int mac_addr_used;
  26
  27void __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
  50u8 *bcm63xx_nvram_get_name(void)
  51{
  52        return nvram.name;
  53}
  54EXPORT_SYMBOL(bcm63xx_nvram_get_name);
  55
  56int 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}
  89EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);
  90
  91int 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}
  98EXPORT_SYMBOL(bcm63xx_nvram_get_psi_size);
  99