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.
