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e7e333cb JG |
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/init.h> | |
ce8f0d06 | 14 | #include <linux/crc32.h> |
e7e333cb JG |
15 | #include <linux/export.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/if_ether.h> | |
18 | ||
19 | #include <bcm63xx_nvram.h> | |
20 | ||
21 | /* | |
22 | * nvram structure | |
23 | */ | |
24 | struct bcm963xx_nvram { | |
25 | u32 version; | |
26 | u8 reserved1[256]; | |
27 | u8 name[16]; | |
28 | u32 main_tp_number; | |
29 | u32 psi_size; | |
30 | u32 mac_addr_count; | |
31 | u8 mac_addr_base[ETH_ALEN]; | |
32 | u8 reserved2[2]; | |
33 | u32 checksum_old; | |
34 | u8 reserved3[720]; | |
35 | u32 checksum_high; | |
36 | }; | |
37 | ||
38 | static struct bcm963xx_nvram nvram; | |
39 | static int mac_addr_used; | |
40 | ||
97367519 | 41 | void __init bcm63xx_nvram_init(void *addr) |
e7e333cb JG |
42 | { |
43 | unsigned int check_len; | |
ce8f0d06 | 44 | u32 crc, expected_crc; |
e7e333cb JG |
45 | |
46 | /* extract nvram data */ | |
47 | memcpy(&nvram, addr, sizeof(nvram)); | |
48 | ||
49 | /* check checksum before using data */ | |
ce8f0d06 JG |
50 | if (nvram.version <= 4) { |
51 | check_len = offsetof(struct bcm963xx_nvram, reserved3); | |
52 | expected_crc = nvram.checksum_old; | |
53 | nvram.checksum_old = 0; | |
54 | } else { | |
e7e333cb | 55 | check_len = sizeof(nvram); |
ce8f0d06 JG |
56 | expected_crc = nvram.checksum_high; |
57 | nvram.checksum_high = 0; | |
58 | } | |
59 | ||
60 | crc = crc32_le(~0, (u8 *)&nvram, check_len); | |
e7e333cb | 61 | |
ce8f0d06 | 62 | if (crc != expected_crc) |
97367519 JG |
63 | pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n", |
64 | expected_crc, crc); | |
e7e333cb JG |
65 | } |
66 | ||
67 | u8 *bcm63xx_nvram_get_name(void) | |
68 | { | |
69 | return nvram.name; | |
70 | } | |
71 | EXPORT_SYMBOL(bcm63xx_nvram_get_name); | |
72 | ||
73 | int bcm63xx_nvram_get_mac_address(u8 *mac) | |
74 | { | |
75 | u8 *oui; | |
76 | int count; | |
77 | ||
78 | if (mac_addr_used >= nvram.mac_addr_count) { | |
79 | pr_err("not enough mac addresses\n"); | |
80 | return -ENODEV; | |
81 | } | |
82 | ||
83 | memcpy(mac, nvram.mac_addr_base, ETH_ALEN); | |
84 | oui = mac + ETH_ALEN/2 - 1; | |
85 | count = mac_addr_used; | |
86 | ||
87 | while (count--) { | |
88 | u8 *p = mac + ETH_ALEN - 1; | |
89 | ||
90 | do { | |
91 | (*p)++; | |
92 | if (*p != 0) | |
93 | break; | |
94 | p--; | |
95 | } while (p != oui); | |
96 | ||
97 | if (p == oui) { | |
98 | pr_err("unable to fetch mac address\n"); | |
99 | return -ENODEV; | |
100 | } | |
101 | } | |
102 | ||
103 | mac_addr_used++; | |
104 | return 0; | |
105 | } | |
106 | EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address); |