米爾基于NXP iMX.93開發(fā)板的網卡驅動移植指南

1. 概述

NXP i.MX93處理器有兩個以太網控制器，其中eqos是TSN網絡控制器。另外一個Fec以太網外圍設備使設備能夠在以太網上傳輸和接收符合IEEE 802.3-2002標準的數據，提供了一個可配置的、靈活的外設，以滿足各種應用程序和客戶的需求。一般情況CPU集成MAC，PHY采用獨立芯片；CPU不集成MAC，MAC和PHY采用集成芯片。MAC和PHY工作在OSI模型的數據鏈路層和物理層。i.MX93的MAC集成在CPU內部，所以還需要外接PHY芯片。

MYD-LMX9X開發(fā)板外接了兩個YT8531SH千兆PHY芯片，ENET1原理圖如圖1-1：

圖1-1. ENET1原理圖

查看原理圖與《MYD-LMX9X-PinList-V1.0.pdf》得出 ENET1數據管腳與i.MX93的對應關系如表1-2：

表1-2. ENET1引腳對應關系

圖1-3. ENET2原理圖

查看原理圖與《MYD-LMX9X-PinList-V1.0.pdf》得出 ENET2數據管腳與MYD-LMX9X的對應關系如表1-4：

表1-4. ENET2引腳對應關系

2. 網卡驅動移植

2-1. 查看內核設備引腳定義

在內核中，有對i.MX93芯片的網口設備樹資源做了定義，此部分由芯片產商提供，屬于公共資源，實際上我們不需要修改這部分，只需要引用即可，如下：

PC:~/myd-lmx9x-bsp/myir-imx-linux$ cat arch/arm64/boot/dts/myir/imx93.dtsi
......
fec: ethernet@42890000 {
compatible = "fsl,imx93-fec", "fsl,imx8mp-fec", "fsl,imx8mq-fec";
reg = <0x42890000 0x10000>;
interrupts = <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 180 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 181 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 182 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk IMX93_CLK_ENET1_GATE>,
<&clk IMX93_CLK_ENET1_GATE>,
<&clk IMX93_CLK_ENET_TIMER1>,
<&clk IMX93_CLK_ENET_REF>,
<&clk IMX93_CLK_ENET_REF_PHY>;
clock-names = "ipg", "ahb", "ptp",
"enet_clk_ref", "enet_out";
assigned-clocks = <&clk IMX93_CLK_ENET_TIMER1>,
<&clk IMX93_CLK_ENET_REF>,
<&clk IMX93_CLK_ENET_REF_PHY>;
assigned-clock-parents = <&clk IMX93_CLK_SYS_PLL_PFD1_DIV2>,
<&clk IMX93_CLK_SYS_PLL_PFD0_DIV2>,
<&clk IMX93_CLK_SYS_PLL_PFD1_DIV2>;
assigned-clock-rates = <100000000>, <250000000>, <50000000>;
fsl,num-tx-queues = <3>;
fsl,num-rx-queues = <3>;
fsl,stop-mode = <&wakeupmix_gpr 0x0c 1>;
status = "disabled";
};

eqos: ethernet@428a0000 {
compatible = "nxp,imx93-dwmac-eqos", "snps,dwmac-5.10a";
reg = <0x428a0000 0x10000>;
interrupts = <GIC_SPI 183 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 184 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "eth_wake_irq", "macirq";
clocks = <&clk IMX93_CLK_ENET_QOS_GATE>,
<&clk IMX93_CLK_ENET_QOS_GATE>,
<&clk IMX93_CLK_ENET_TIMER2>,
<&clk IMX93_CLK_ENET>,
<&clk IMX93_CLK_ENET_QOS_GATE>;
clock-names = "stmmaceth", "pclk", "ptp_ref", "tx", "mem";
assigned-clocks = <&clk IMX93_CLK_ENET_TIMER2>,
<&clk IMX93_CLK_ENET>;
assigned-clock-parents = <&clk IMX93_CLK_SYS_PLL_PFD1_DIV2>,
<&clk IMX93_CLK_SYS_PLL_PFD0_DIV2>;
assigned-clock-rates = <100000000>, <250000000>;
intf_mode = <&wakeupmix_gpr 0x28>;
clk_csr = <0>;
nvmem-cells = <&eth_mac2>;
nvmem-cell-names = "mac-address";
status = "disabled";
};

上述只是對網口做了基本的初始化，并沒有對具體的硬件設備進行適配，在實際的情況下需要對具體的網口設備進行硬件引腳資源的適配。

2-2. 添加網卡設備樹節(jié)點

根據原理圖的定義添加網口的設備樹配置，修改myir-imx93-11x11.dts文件，如下：

PC:~/myd-lmx9x-bsp/myir-imx-linux$ cat arch/arm64/boot/dts/myir/myir-imx93-11x11.dts
......
&eqos {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_eqos>;
phy-mode = "rgmii-id";
phy-handle = <&ethphy1>;
status = "okay";

mdio {
compatible = "snps,dwmac-mdio";
#address-cells = <1>;
#size-cells = <0>;
clock-frequency = <5000000>;

ethphy1: ethernet-phy@1 {
compatible = "ethernet-phy-ieee802.3-c22";
reg = <4>;
eee-broken-1000t;
};
};
};

&fec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec>;
phy-mode = "rgmii-id";
phy-handle = <&ethphy2>;
fsl,magic-packet;
status = "okay";

mdio {
compatible = "snps,dwmac-mdio";
#address-cells = <1>;
#size-cells = <0>;
clock-frequency = <5000000>;

ethphy2: ethernet-phy@2 {
compatible = "ethernet-phy-ieee802.3-c22";
reg = <6>;
eee-broken-1000t;
};
};
};

2-3. 網卡設備數配置

添加網卡設備樹節(jié)點的eth1_pins和eth2_pins引腳定義：

pinctrl_eqos: eqosgrp {
fsl,pins = <
MX93_PAD_ENET1_MDC__ENET_QOS_MDC 0x57e
MX93_PAD_ENET1_MDIO__ENET_QOS_MDIO 0x57e
MX93_PAD_ENET1_RD0__ENET_QOS_RGMII_RD0 0x57e
MX93_PAD_ENET1_RD1__ENET_QOS_RGMII_RD1 0x57e
MX93_PAD_ENET1_RD2__ENET_QOS_RGMII_RD2 0x57e
MX93_PAD_ENET1_RD3__ENET_QOS_RGMII_RD3 0x57e
MX93_PAD_ENET1_RXC__CCM_ENET_QOS_CLOCK_GENERATE_RX_CLK 0x5fe
MX93_PAD_ENET1_RX_CTL__ENET_QOS_RGMII_RX_CTL 0x57e
MX93_PAD_ENET1_TD0__ENET_QOS_RGMII_TD0 0x57e
MX93_PAD_ENET1_TD1__ENET_QOS_RGMII_TD1 0x57e
MX93_PAD_ENET1_TD2__ENET_QOS_RGMII_TD2 0x57e
MX93_PAD_ENET1_TD3__ENET_QOS_RGMII_TD3 0x57e
MX93_PAD_ENET1_TXC__CCM_ENET_QOS_CLOCK_GENERATE_TX_CLK 0x5fe
MX93_PAD_ENET1_TX_CTL__ENET_QOS_RGMII_TX_CTL 0x57e
>;
};

pinctrl_fec: fecgrp {
fsl,pins = <
MX93_PAD_ENET2_MDC__ENET1_MDC 0x57e
MX93_PAD_ENET2_MDIO__ENET1_MDIO 0x57e
MX93_PAD_ENET2_RD0__ENET1_RGMII_RD0 0x57e
MX93_PAD_ENET2_RD1__ENET1_RGMII_RD1 0x57e
MX93_PAD_ENET2_RD2__ENET1_RGMII_RD2 0x57e
MX93_PAD_ENET2_RD3__ENET1_RGMII_RD3 0x57e
MX93_PAD_ENET2_RXC__ENET1_RGMII_RXC 0x5fe
MX93_PAD_ENET2_RX_CTL__ENET1_RGMII_RX_CTL 0x57e
MX93_PAD_ENET2_TD0__ENET1_RGMII_TD0 0x57e
MX93_PAD_ENET2_TD1__ENET1_RGMII_TD1 0x57e
MX93_PAD_ENET2_TD2__ENET1_RGMII_TD2 0x57e
MX93_PAD_ENET2_TD3__ENET1_RGMII_TD3 0x57e
MX93_PAD_ENET2_TXC__ENET1_RGMII_TXC 0x5fe
MX93_PAD_ENET2_TX_CTL__ENET1_RGMII_TX_CTL 0x57e
>;
};

2-4. 配置內核

PHY驅動位于drivers/net/phy/motorcomm.c，我們只需要把這個驅動打開，編譯進內核即可，內核已默認配置網卡驅動，這里我們不再描述。最后編譯內核源碼，把新生成的設備樹dtb文件更新到板子即可。

2-5. 網絡測試

• 測試ENET1

root@myd-lmx9x:/# ping www.baidu.com -I eth0
PING www.baidu.com (14.215.177.39): 56 data bytes
64 bytes from 14.215.177.39: seq=0 ttl=56 time=7.987 ms
64 bytes from 14.215.177.39: seq=1 ttl=56 time=8.030 ms
64 bytes from 14.215.177.39: seq=2 ttl=56 time=7.250 ms

• 測試ENET2

root@myd-lmx9x:/# ping www.baidu.com -I eth1
PING www.baidu.com (14.215.177.39): 56 data bytes
64 bytes from 14.215.177.39: seq=3 ttl=56 time=7.507 ms
64 bytes from 14.215.177.39: seq=4 ttl=56 time=7.488 ms
64 bytes from 14.215.177.39: seq=5 ttl=56 time=7.151 ms
64 bytes from 14.215.177.39: seq=6 ttl=56 time=7.043 ms