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 | |
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: &nvram, expected_out: &expected_crc, actual_out: &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 | |
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); |
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); |
99 | |