Linux Ethernet PHY 驱动

不念不忘少年蓝@ 2023-06-08 12:59 15阅读 0赞

今年在FPGA上和IC那边一起验证了MAC/PHY, 基于linux 3.6.4, 这边小结一下代码.

phy的初始化顺序  
第一步  
phy\_init  
mdio\_bus\_init  
bus\_register(&mdio\_bus\_type);//autoprobe  
phy\_driver\_register(&genphy\_driver);

第二步, 具体的phy驱动的初始化(以icplus为例)  
icplus\_init  
phy\_drivers\_register(icplus\_driver, ARRAY\_SIZE(icplus\_driver));  
phy\_driver\_register  
new\_driver->driver.bus = &mdio\_bus\_type; //也是mdio\_bus\_type  
new\_driver->driver.probe = phy\_probe;  
new\_driver->driver.remove = phy\_remove;  
driver\_register  
bus\_add\_driver  
driver\_attach //下面没跑,因为先注册的是driver, 还没有match的device, 只是示例而已  
\_\_driver\_attach  
driver\_match\_device  
drv->bus->match //也就是 mdio\_bus\_type 里面的 mdio\_bus\_match

第三步,网卡驱动  
mt\_eth\_init  
platform\_driver\_register(&mt\_eth\_driver);  
mt\_eth\_drv\_probe  
mt\_eth\_mii\_init  
mdiobus\_register  
device\_register  
device\_add  
bus\_add\_device  
bus\_probe\_device  
device\_attach  
\_\_device\_attach  
driver\_match\_device  
drv->bus->match //也就是 mdio\_bus\_type 里面的 mdio\_bus\_match  
driver\_probe\_device  
really\_probe  
dev->bus->probe//也就是 phy\_probe, 此时是PHY\_READY状态  
phydev->drv->probe //如果有,则调用具体phy的probe,比如icplus的 mdiobus\_scan  
get\_phy\_device  
get\_phy\_id  
phy\_device\_create //PHY\_DOWN状态  
mdiobus\_scan  
phy\_device\_register  
device\_register //然后就和上面的流程一样了  
mt\_eth\_mii\_probe // 和mdiobus\_register同一级, 在mt\_eth\_mii\_init 中调用  
phy\_connect  
bus\_find\_device\_by\_name  
phy\_connect\_direct  
phy\_attach\_direct // 此时是PHY\_READY状态  
phy\_init\_hw  
phydev->drv->config\_init(phydev);//icplus中的具体实现  
phy\_start\_machine  
调度delayed\_work, 其实就是 phy\_state\_machine  
mt\_eth\_adjust\_link

补充一下mdio\_bus\_match, 会发现其实是看 ((phydrv->phy\_id & phydrv->phy\_id\_mask) == (phydev->phy\_id & phydrv->phy\_id\_mask)) 与否.