mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 11:32:04 +00:00
e60665c50f
Signed-off-by: Jonas Gorski <jogo@openwrt.org> Acked-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
|
|
* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
|
|
* Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "bcm63xx_nvram: " fmt
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/crc32.h>
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/if_ether.h>
|
|
|
|
#include <bcm63xx_nvram.h>
|
|
|
|
/*
|
|
* nvram structure
|
|
*/
|
|
struct bcm963xx_nvram {
|
|
u32 version;
|
|
u8 reserved1[256];
|
|
u8 name[16];
|
|
u32 main_tp_number;
|
|
u32 psi_size;
|
|
u32 mac_addr_count;
|
|
u8 mac_addr_base[ETH_ALEN];
|
|
u8 reserved2[2];
|
|
u32 checksum_old;
|
|
u8 reserved3[720];
|
|
u32 checksum_high;
|
|
};
|
|
|
|
#define BCM63XX_DEFAULT_PSI_SIZE 64
|
|
|
|
static struct bcm963xx_nvram nvram;
|
|
static int mac_addr_used;
|
|
|
|
void __init bcm63xx_nvram_init(void *addr)
|
|
{
|
|
unsigned int check_len;
|
|
u32 crc, expected_crc;
|
|
u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff };
|
|
|
|
/* extract nvram data */
|
|
memcpy(&nvram, addr, sizeof(nvram));
|
|
|
|
/* check checksum before using data */
|
|
if (nvram.version <= 4) {
|
|
check_len = offsetof(struct bcm963xx_nvram, reserved3);
|
|
expected_crc = nvram.checksum_old;
|
|
nvram.checksum_old = 0;
|
|
} else {
|
|
check_len = sizeof(nvram);
|
|
expected_crc = nvram.checksum_high;
|
|
nvram.checksum_high = 0;
|
|
}
|
|
|
|
crc = crc32_le(~0, (u8 *)&nvram, check_len);
|
|
|
|
if (crc != expected_crc)
|
|
pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
|
|
expected_crc, crc);
|
|
|
|
/* Cable modems have a different NVRAM which is embedded in the eCos
|
|
* firmware and not easily extractible, give at least a MAC address
|
|
* pool.
|
|
*/
|
|
if (BCMCPU_IS_3368()) {
|
|
memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN);
|
|
nvram.mac_addr_count = 2;
|
|
}
|
|
}
|
|
|
|
u8 *bcm63xx_nvram_get_name(void)
|
|
{
|
|
return nvram.name;
|
|
}
|
|
EXPORT_SYMBOL(bcm63xx_nvram_get_name);
|
|
|
|
int bcm63xx_nvram_get_mac_address(u8 *mac)
|
|
{
|
|
u8 *oui;
|
|
int count;
|
|
|
|
if (mac_addr_used >= nvram.mac_addr_count) {
|
|
pr_err("not enough mac addresses\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
memcpy(mac, nvram.mac_addr_base, ETH_ALEN);
|
|
oui = mac + ETH_ALEN/2 - 1;
|
|
count = mac_addr_used;
|
|
|
|
while (count--) {
|
|
u8 *p = mac + ETH_ALEN - 1;
|
|
|
|
do {
|
|
(*p)++;
|
|
if (*p != 0)
|
|
break;
|
|
p--;
|
|
} while (p != oui);
|
|
|
|
if (p == oui) {
|
|
pr_err("unable to fetch mac address\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
mac_addr_used++;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);
|
|
|
|
int bcm63xx_nvram_get_psi_size(void)
|
|
{
|
|
if (nvram.psi_size > 0)
|
|
return nvram.psi_size;
|
|
|
|
return BCM63XX_DEFAULT_PSI_SIZE;
|
|
}
|
|
EXPORT_SYMBOL(bcm63xx_nvram_get_psi_size);
|