MDIO 协议
MDIO（Media Independent Interface）是一种广泛应用于以太网物理层芯片（PHY）与MAC控制器之间通信的接口标准，主要用于管理和配置PHY芯片的各种参数，例如工作模式（10M/100M/1000M）、双工模式（半双工/全双工）以及自协商等功能
MDIO接口通常包含两根信号线：MDIO（主设备数据输入输出线）和MDC（管理数据时钟线）。通过MDC提供的时钟信号，MAC控制器可以在MDIO线上按特定协议格式与PHY进行数据交换，实现对PHY的配置和状态查询。
RTL8201F
在以太网设备中，MAC（Media Access Control）控制器负责处理高层协议数据包的收发，而PHY则负责将这些数据包转换为电信号并在物理媒介上传输。MDIO接口允许MAC控制器读写PHY内部寄存器，以便控制和监控PHY的工作状态。
rk3568 硬件设计
CLK_REF
rk3568-pinctrl.dtsi
RMII只需要接10根线，对应如下：
gmac1 {
/omit-if-no-ref/
gmac1m1_miim: gmac1m1-miim {
rockchip,pins =
/* gmac1_mdcm1 */
<4 RK_PB6 3 &pcfg_pull_none>,
/* gmac1_mdiom1 */
<4 RK_PB7 3 &pcfg_pull_none>;
};
/omit-if-no-ref/
gmac1m1_rx_er: gmac1m1-rx-er {
rockchip,pins =
/* gmac1_rxerm1 */
<4 RK_PB2 3 &pcfg_pull_none>;
};
/omit-if-no-ref/
gmac1m1_rx_bus2: gmac1m1-rx-bus2 {
rockchip,pins =
/* gmac1_rxd0m1 */
<4 RK_PA7 3 &pcfg_pull_none>,
/* gmac1_rxd1m1 */
<4 RK_PB0 3 &pcfg_pull_none>,
/* gmac1_rxdvcrsm1 */
<4 RK_PB1 3 &pcfg_pull_none>;
};
/omit-if-no-ref/
gmac1m1_tx_bus2: gmac1m1-tx-bus2 {
rockchip,pins =
/* gmac1_txd0m1 */
<4 RK_PA4 3 &pcfg_pull_none_drv_level_2>,
/* gmac1_txd1m1 */
<4 RK_PA5 3 &pcfg_pull_none_drv_level_2>,
/* gmac1_txenm1 */
<4 RK_PA6 3 &pcfg_pull_none>;
};
/omit-if-no-ref/
gmac1m1_clkinout: gmac1m1-clkinout {
rockchip,pins =
/* gmac1_mclkinoutm1 */
<4 RK_PC1 3 &pcfg_pull_none>;
};
};
GMAC1_RSTn 复位引脚
Set low to reset the chip. For a complete reset, this pin must be asserted low for at least 10ms.
驱动配置
瑞芯微官方文档: Rockchip_Developer_Guide_Linux_GMAC_Mode_Configuration_CN.pdf
RJ45
以太网不通日志分析
异常时网卡状态
eth0 Link encap:Ethernet HWaddr 4e:ec:04:ce:b0:7f Driver rk_gmac-dwmac // 以太网控制器的驱动程序
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 TX bytes:0 //目前通过此接口接收（RX）和发送（TX）的字节数均为零，表示尚未通过此接口传输任何数据。
Interrupt:39
异常日志
[ 0.000000] psci: probing for conduit method from DT.
[ 0.262433] rk_gmac-dwmac fe010000.ethernet: no regulator found
[ 0.262459] rk_gmac-dwmac fe010000.ethernet: clock input or output? (output).
[ 0.262469] rk_gmac-dwmac fe010000.ethernet: Can not read property: tx_delay.
[ 0.262477] rk_gmac-dwmac fe010000.ethernet: set tx_delay to 0xffffffff
[ 0.262485] rk_gmac-dwmac fe010000.ethernet: Can not read property: rx_delay.
[ 0.262492] rk_gmac-dwmac fe010000.ethernet: set rx_delay to 0xffffffff
[ 0.262503] rk_gmac-dwmac fe010000.ethernet: integrated PHY? (no).
[ 0.262540] rk_gmac-dwmac fe010000.ethernet: cannot get clock clk_mac_ref
[ 0.267576] rk_gmac-dwmac fe010000.ethernet: init for RMII
[ 0.267592] rk_gmac-dwmac fe010000.ethernet: ======================init for RMII================
[ 0.267639] rk_gmac-dwmac fe010000.ethernet: [stmmac_dvr_probe-4362]led_status_value = 0x6940
[ 0.267830] rk_gmac-dwmac fe010000.ethernet: User ID: 0x30, Synopsys ID: 0x51
[ 0.267849] rk_gmac-dwmac fe010000.ethernet: DWMAC4/5
[ 0.267860] rk_gmac-dwmac fe010000.ethernet: DMA HW capability register supported
[ 0.267867] rk_gmac-dwmac fe010000.ethernet: RX Checksum Offload Engine supported
[ 0.267884] rk_gmac-dwmac fe010000.ethernet: TX Checksum insertion supported
[ 0.267897] rk_gmac-dwmac fe010000.ethernet: Wake-Up On Lan supported
[ 0.267932] rk_gmac-dwmac fe010000.ethernet: TSO supported
[ 0.267946] rk_gmac-dwmac fe010000.ethernet: Enable RX Mitigation via HW Watchdog Timer
[ 0.267960] rk_gmac-dwmac fe010000.ethernet: TSO feature enabled
[ 14.235831] using random self ethernet address
[ 14.235920] using random host ethernet address
[ 23.816446] rk_gmac-dwmac fe010000.ethernet eth0: No Safety Features support found
[ 23.816544] rk_gmac-dwmac fe010000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[ 23.817213] rk_gmac-dwmac fe010000.ethernet eth0: registered PTP clock
[ 23.818058] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
rk3566 RGMII正常日志
[ 0.210105] rk_gmac-dwmac fe010000.ethernet: no regulator found
[ 0.210117] rk_gmac-dwmac fe010000.ethernet: clock input or output? (output).
[ 0.210126] rk_gmac-dwmac fe010000.ethernet: TX delay(0x3d).
[ 0.210132] rk_gmac-dwmac fe010000.ethernet: RX delay(0x27).
[ 0.210142] rk_gmac-dwmac fe010000.ethernet: integrated PHY? (no).
[ 0.215178] rk_gmac-dwmac fe010000.ethernet: init for RGMII
[ 0.215464] rk_gmac-dwmac fe010000.ethernet: User ID: 0x30, Synopsys ID: 0x51
[ 0.215475] rk_gmac-dwmac fe010000.ethernet: DWMAC4/5
[ 0.215483] rk_gmac-dwmac fe010000.ethernet: DMA HW capability register supported
[ 0.215489] rk_gmac-dwmac fe010000.ethernet: RX Checksum Offload Engine supported
[ 0.215495] rk_gmac-dwmac fe010000.ethernet: TX Checksum insertion supported
[ 0.215500] rk_gmac-dwmac fe010000.ethernet: Wake-Up On Lan supported
[ 0.215532] rk_gmac-dwmac fe010000.ethernet: TSO supported
[ 0.215539] rk_gmac-dwmac fe010000.ethernet: Enable RX Mitigation via HW Watchdog Timer
[ 0.215546] rk_gmac-dwmac fe010000.ethernet: TSO feature enabled
[ 6.559585] using random self ethernet address
[ 6.559604] using random host ethernet address
[ 19.376067] rk_gmac-dwmac fe010000.ethernet: rk_get_eth_addr: mac address: 28:54:ea:e5:92:e3
[ 19.376091] rk_gmac-dwmac fe010000.ethernet: device MAC address 28:54:ea:e5:92:e3
[ 19.395969] rk_gmac-dwmac fe010000.ethernet eth0: No Safety Features support found
[ 19.395990] rk_gmac-dwmac fe010000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[ 19.400685] rk_gmac-dwmac fe010000.ethernet eth0: registered PTP clock
[ 19.401369] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 19.457347] rk_gmac-dwmac fe010000.ethernet: RGMII TX&RX delay fixup for YT8511
[ 22.454963] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 22.455042] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
PHY 寄存器读写测试
驱动提供了读写寄存器的接口，目前在不同内核版本上面有两套接口。 路径： /sys/bus/mdio_bus/devices/stmmac-0:00，其中 stmmac-0:00 表示 PHY 地址是 0。
rk3568_r:/ $ cat sys/bus/mdio_bus/devices/stmmac-1\:00/phy_registers
0: 0xffff
1: 0xffff
2: 0xffff
3: 0xffff
4: 0xffff
5: 0xffff
6: 0xffff
7: 0xffff
8: 0xffff
9: 0xffff
10: 0xffff
11: 0xffff
12: 0xffff
13: 0xffff
14: 0xffff
15: 0xffff
16: 0xffff
17: 0xffff
18: 0xffff
19: 0xffff
20: 0xffff
21: 0xffff
22: 0xffff
23: 0xffff
24: 0xffff
25: 0xffff
26: 0xffff
27: 0xffff
28: 0xffff
29: 0xffff
30: 0xffff
31: 0xffff
