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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 | ||
5a8b0b13 | 13 | #include <linux/bcm963xx_nvram.h> |
e7e333cb | 14 | #include <linux/init.h> |
ce8f0d06 | 15 | #include <linux/crc32.h> |
e7e333cb JG |
16 | #include <linux/export.h> |
17 | #include <linux/kernel.h> | |
18 | #include <linux/if_ether.h> | |
19 | ||
20 | #include <bcm63xx_nvram.h> | |
21 | ||
b0a119fd RB |
22 | #define BCM63XX_DEFAULT_PSI_SIZE 64 |
23 | ||
e7e333cb JG |
24 | static struct bcm963xx_nvram nvram; |
25 | static int mac_addr_used; | |
26 | ||
97367519 | 27 | void __init bcm63xx_nvram_init(void *addr) |
e7e333cb | 28 | { |
ce8f0d06 | 29 | u32 crc, expected_crc; |
0680dc86 | 30 | u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff }; |
e7e333cb JG |
31 | |
32 | /* extract nvram data */ | |
5a8b0b13 | 33 | memcpy(&nvram, addr, BCM963XX_NVRAM_V5_SIZE); |
e7e333cb JG |
34 | |
35 | /* check checksum before using data */ | |
5a8b0b13 | 36 | if (bcm963xx_nvram_checksum(&nvram, &expected_crc, &crc)) |
97367519 JG |
37 | pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n", |
38 | expected_crc, crc); | |
0680dc86 FF |
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 | } | |
e7e333cb JG |
48 | } |
49 | ||
50 | u8 *bcm63xx_nvram_get_name(void) | |
51 | { | |
52 | return nvram.name; | |
53 | } | |
54 | EXPORT_SYMBOL(bcm63xx_nvram_get_name); | |
55 | ||
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); | |
b0a119fd RB |
90 | |
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); |