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ar71xx: WNR2200: fix for random WLAN MAC

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Fix for invalid/random/duplicate WLAN MAC address in WNR2200.
Permanent platform MAC is calculated and assigned during system startup.
WLAN MAC follows wired Ethernet interface addresses.

Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>

SVN-Revision: 49100
This commit is contained in:
John Crispin 2016-04-01 07:11:27 +00:00
parent c8dd53e591
commit 3da1ef38c1
1 changed files with 37 additions and 2 deletions
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39
target/linux/ar71xx/files/arch/mips/ath79/mach-wnr2200.c
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@ -12,6 +12,7 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/kernel.h> /* for max() macro */
#include <asm/mach-ath79/ath79.h>
@ -45,6 +46,7 @@
#define WNR2200_MAC0_OFFSET 0
#define WNR2200_MAC1_OFFSET 6
#define WNR2200_PCIE_CALDATA_OFFSET 0x1000
#define WNR2200_WMAC_OFFSET 0x108c /* wireless MAC is inside ART */
static struct gpio_led wnr2200_leds_gpio[] __initdata = {
{
@ -102,9 +104,40 @@ static struct gpio_led wnr2200_leds_gpio[] __initdata = {
}
};
/*
* For WNR2200 ART flash area used for WLAN MAC is usually empty (0xff)
* so ath9k driver uses random MAC instead each time module is loaded.
* OpenWrt's original fix was to copy eth1 address to WLAN interface.
* New solution does not duplicate hardware addresses and is taken from
* WNR2000v3 code. It assigns permanent WLAN MAC equal to ethN's MAC
* plus 1, so network interfaces get sequential addresses.
* If ART wireless MAC address field has been filled by user, use it.
*/
static void __init wnr2200_get_wmac(u8 *wmac_gen_addr, int mac0_art_offset,
int mac1_art_offset, int wmac_art_offset)
{
u8 *art = (u8 *) KSEG1ADDR(0x1fff0000);
u8 *eth0_mac_addr = (u8 *) (art + mac0_art_offset);
u8 *eth1_mac_addr = (u8 *) (art + mac1_art_offset);
u8 *wlan_mac_addr = (u8 *) (art + wmac_art_offset);
/* only 0xff if all bits are set - address is invalid, empty area */
if ((wlan_mac_addr[0] & wlan_mac_addr[1] & wlan_mac_addr[2] &
wlan_mac_addr[3] & wlan_mac_addr[4] & wlan_mac_addr[5]) == 0xff) {
memcpy(wmac_gen_addr, eth0_mac_addr, 5);
wmac_gen_addr[5] = max(eth0_mac_addr[5], eth1_mac_addr[5]) + 1;
/* Avoid potential conflict in case max(0xff,0x00)+1==0x00 */
if (!wmac_gen_addr[5])
wmac_gen_addr[5] = 1;
} else
memcpy(wmac_gen_addr, wlan_mac_addr, 6);
}
static void __init wnr2200_setup(void)
{
u8 *art = (u8 *) KSEG1ADDR(0x1fff0000);
u8 wlan_mac_addr[6];
ath79_register_mdio(0, 0x0);
@ -121,8 +154,10 @@ static void __init wnr2200_setup(void)
ath79_register_eth(1);
ath79_register_m25p80(NULL);
ap91_pci_init(art + WNR2200_PCIE_CALDATA_OFFSET,
art + WNR2200_MAC1_OFFSET);
wnr2200_get_wmac(wlan_mac_addr, WNR2200_MAC0_OFFSET,
WNR2200_MAC1_OFFSET, WNR2200_WMAC_OFFSET);
ap91_pci_init(art + WNR2200_PCIE_CALDATA_OFFSET, wlan_mac_addr);
ath79_register_leds_gpio(-1, ARRAY_SIZE(wnr2200_leds_gpio),
wnr2200_leds_gpio);