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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  
bcm63xx_nvram_init(void * addr)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  
bcm63xx_nvram_get_name(void)50  u8 *bcm63xx_nvram_get_name(void)
51  {
52  	return nvram.name;
53  }
54  EXPORT_SYMBOL(bcm63xx_nvram_get_name);
55  
bcm63xx_nvram_get_mac_address(u8 * mac)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  
bcm63xx_nvram_get_psi_size(void)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