MT7628與MT7688除了WIFI之外,其他幾乎一樣,沒有區別;至少在網口方面是一樣的;本文將介紹Openwrt中多網口與其複用爲GPIO的方式
關於模式:
只有單網口以及5網口的兩種,沒有中間方案;這一點需要留意;
首先看datasheet配置
關於寄存器配置,可以在兩個地方進行:
其一Uboot中設定
drivers/rt2880_eth.c, 宏定義CONFIG_ETH_ONE_PORT_ONLY部分即是;
void rt305x_esw_init(void)
{
....
#elif defined (MT7628_ASIC_BOARD)
/*TODO: Init MT7628 ASIC PHY HERE*/
i = RALINK_REG(RT2880_AGPIOCFG_REG);
#if defined (CONFIG_ETH_ONE_PORT_ONLY)
i |= MT7628_EPHY_EN;
i = i & ~(MT7628_P0_EPHY_AIO_EN);
#else
i = i & ~(MT7628_EPHY_EN);
#endif
RALINK_REG(RT2880_AGPIOCFG_REG) = i;
printf("RESET MT7628 PHY!!!!!!");
// reset phy
i = RALINK_REG(RT2880_RSTCTRL_REG);
i = i | RSTCTRL_EPHY_RST;
RALINK_REG(RT2880_RSTCTRL_REG) = i;
i = i & ~(RSTCTRL_EPHY_RST);
RALINK_REG(RT2880_RSTCTRL_REG) = i;
i = RALINK_REG(RALINK_SYSCTL_BASE + 0x64);
#if defined (CONFIG_ETH_ONE_PORT_ONLY)
i &= 0xf003f003;
i |= 0x05540554;
RALINK_REG(RALINK_SYSCTL_BASE + 0x64) = i; // set P0 EPHY LED mode
#else
i &= 0xf003f003;
RALINK_REG(RALINK_SYSCTL_BASE + 0x64) = i;
#endif
udelay(5000);
mt7628_ephy_init();
...
}
CONFIG_ETH_ONE_PORT_ONLY 在menuconfig中配置,最終記錄在autoconf.h中;
menuconfig的配置除了ONE_PORT_ONLY 之外還有WLLL,LLLW等配置,自行根據板子所用到的網口進行選擇;
x x [ ] ETH One Port Only
x x [*] Partition LAN/WAN
x x (LLLL/W) LAN/WAN Board Layout
x x ---
x x Load an Alternate Configuration File
x x Save Configuration to an Alternate File
內核的配置,主要在DTS中:
ethernet@10100000 {
mtd-mac-address = <&factory 0x4>;
ralink,port-map = "llllw";
};
"ralink,port-map"將被 drivres/net/ethernet/ralink/esw_rt3052.c
解析
#define RT305X_ESW_PMAP_LLLLLL 0x3f
#define RT305X_ESW_PMAP_LLLLWL 0x2f
#define RT305X_ESW_PMAP_WLLLLL 0x3e
static int esw_probe(struct platform_device *pdev)
{
...
port_map = of_get_property(np, "ralink,portmap", NULL);
if (port_map)
esw->port_map = be32_to_cpu(*port_map);
...
esw_hw_init(esw);
}
static void esw_hw_init(struct rt305x_esw *esw)
{
int i;
u8 port_disable = 0;
u8 port_map = RT305X_ESW_PMAP_LLLLLL;
...
if (esw->port_map)
port_map = esw->port_map;
else
port_map = RT305X_ESW_PMAP_LLLLLL;
/*
* Unused HW feature, but still nice to be consistent here...
* This is also exported to userspace ('lan' attribute) so it's
* conveniently usable to decide which ports go into the wan vlan by
* default.
*/
esw_rmw(esw, RT305X_ESW_REG_SGC2,
RT305X_ESW_SGC2_LAN_PMAP_M << RT305X_ESW_SGC2_LAN_PMAP_S,
port_map << RT305X_ESW_SGC2_LAN_PMAP_S);
}
因此無論uboot和dts中如何配置,PORT0 一定是作爲網口並且是使能可用的;
需要注意的地方
Uboot中針對網口寄存器進行了設定之後,Kernel中 解析dts配置,然後驅動初始化,並沒有設定全部,最終加載後,還是隻有一個網口;
即如果使用的是單網口配置的uboot,openwrt系統起來後,還需在對寄存器進行一次設定;
在此,我們可以參考mtk-openwrt-sdk中的reg工具進行,在openwrt系統加載完後,在應用空間進行寄存器修改
start() {
reg w 10000064 0x0
reg w 1000003c 0xe001ff
}
關於LAN和WAN的設定,在文件target/linux/ramips/base-files/etc/board.d/02_network
ramips_setup_rt3x5x_vlans()
{
if [ ! -x /sbin/swconfig ]; then
# legacy default
ucidef_set_interfaces_lan_wan "eth0.1" "eth0.2"
return
fi
local wanports=""
local lanports=""
for port in 5 4 3 2 1 0; do
if [ `swconfig dev rt305x port $port get disable` = "1" ]; then
continue
fi
if [ `swconfig dev rt305x port $port get lan` = "0" ]; then
wanports="$port $wanports"
else
lanports="$port $lanports"
fi
done
ucidef_set_interfaces_lan_wan "eth0.1" "eth0.2"
ucidef_add_switch "rt305x" "1" "1"
ucidef_add_switch_vlan "rt305x" "1" "$lanports 6t"
ucidef_add_switch_vlan "rt305x" "2" "$wanports 6t"
}
...
zbt-wg2626)|\
your-borad-name)
ucidef_set_interfaces_lan_wan "eth0.1" "eth0.2"
ucidef_add_switch "switch0" "1" "1"
ucidef_add_switch_vlan "switch0" "1" "0 1 2 3 6t"
ucidef_add_switch_vlan "switch0" "2" "4 6t"
;;
需要注意的是 02_network僅僅只是將配置寫入配置文件,然後有系統加載執行,前提是reg 先設定好相關寄存器,否則只改變02_network是無效的;