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