[Linux 底层]U-boot ksz8081网络驱动调试

micrel公司一款优秀的PHY芯片，关于芯片的介绍参考：

[Datasheet PHY] ksz8081数据手册解读

系统版本：Ubuntu18.04-64

编译器版本：gcc version 7.4.0 (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04.1)

uboot版本：2018.07 -linux4sam_6.0

板子型号：at91sama5d3x-xplained

MCU型号：sama5d36

与ksz9031很相似，公众部分可参考：

1、如何找到uboot官网开发板默认配置文件路径

2、如何进行公共信息配置

3、如何核对开发板硬件的参数

4、如何对uboot功能进行裁剪

5、设备树文件存放位置，及IO配置

6、网卡初始化流程，程序入口如何调用驱动文件接口；

[Linux 底层]U-boot ksz9031网络驱动调试

关注微信公众号，回复“ksz8081驱动”，免费下载ksz8081的驱动源代码。

硬件参考图如下：

1、设备树更改

phy-mode = “rmii”; PHY的接口方式为RMII 外部需要提供50MHZ时钟，或者通过内部倍频；

gpios，因为硬件设计上，把芯片的电源和RST单独控制，可给芯片复位，或者进行上下电操作；可在应用层进行调用；

            macb1: ethernet@f802c000 {

                phy-mode = "rmii";

                #address-cells = <1>;

                #size-cells = <0>;

                pinctrl-0 = <&pinctrl_mcb1_rst >;

                status = "okay";

                gpios = <

                    &pioC   18 GPIO_ACTIVE_HIGH ///poweren

                    &pioC   31 GPIO_ACTIVE_HIGH ///rst

                    >;

                ethernet-phy@1 {

                    reg = <0x1>;

                };

            };

2、驱动初始化函数入口

#ifdef CONFIG_PHY_MICREL_KSZ8XXX

    phy_micrel_ksz8xxx_init();

#endif

int phy_micrel_ksz8xxx_init(void)

{

    printf("phy_micrel_ksz8xxx_init KSZ8081_drivern");

    phy_register(&KSZ804_driver);

    phy_register(&KSZ8031_driver);

    phy_register(&KSZ8051_driver);

    phy_register(&KSZ8081_driver);

    phy_register(&KS8721_driver);

    phy_register(&ksz8895_driver);

    phy_register(&ksz886x_driver);

    return 0;

}

50MHz晶振

static struct phy_driver KSZ8081_driver = {

    .name = "Micrel KSZ8081",

    .uid = 0x221560,

    .mask = 0xfffff0,

    .features = PHY_BASIC_FEATURES,

    .config = &ksz_8081_config,  //配置函数进行了重构，因为外部使用50M晶振，官网使用25M晶振

    .startup = &genphy_startup,

    .shutdown = &genphy_shutdown,

};

static int ksz_8081_config(struct phy_device *phydev)

{

    int ret;

    int regval;

    //50M晶振配置

    regval = phy_read(phydev, MDIO_DEVAD_NONE,MII_KSZPHY_CTRL);

    regval |= KSZ8051_RMII_50MHZ_CLK;

    phy_write(phydev, MDIO_DEVAD_NONE,MII_KSZPHY_CTRL, regval);

    printf(" ksz_8081_config MII_KSZPHY_CTRL(0x1f) =0x%xn",regval);

    ret = phy_read(phydev, MDIO_DEVAD_NONE, MII_KSZPHY_OMSO);

    if (ret < 0)

        return ret;

    ret |= KSZPHY_OMSO_B_CAST_OFF;

    //ret &= ~KSZPHY_OMSO_B_CAST_OFF;

    printf(" ksz_8081_config MII_KSZPHY_OMSO(0x16) =0x%xn",ret);

    ret = phy_write(phydev, MDIO_DEVAD_NONE, MII_KSZPHY_OMSO,

            ret);

    if (ret < 0)

        return ret;

    return genphy_config(phydev);

}

int genphy_config(struct phy_device *phydev)

{

    int val;

    u32 features;

    features = (SUPPORTED_TP | SUPPORTED_MII

            | SUPPORTED_AUI | SUPPORTED_FIBRE |

            SUPPORTED_BNC);

    /* Do we support autonegotiation? */

    val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);

    printf("genphy_config phyaddr=%d,MII_BMSR(%d)=0x%xn",phydev->addr,MII_BMSR,val);

    if (val < 0)

        return val;

    if (val & BMSR_ANEGCAPABLE)

        features |= SUPPORTED_Autoneg;

    if (val & BMSR_100FULL)

        features |= SUPPORTED_100baseT_Full;

    if (val & BMSR_100HALF)

        features |= SUPPORTED_100baseT_Half;

    if (val & BMSR_10FULL)

        features |= SUPPORTED_10baseT_Full;

    if (val & BMSR_10HALF)

        features |= SUPPORTED_10baseT_Half;

    if (val & BMSR_ESTATEN) {

        val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);

        printf("genphy_config phyaddr=%d,MII_ESTATUS(%d)=0x%xn",phydev->addr,MII_ESTATUS,val);

        if (val < 0)

            return val;

        if (val & ESTATUS_1000_TFULL)

            features |= SUPPORTED_1000baseT_Full;

        if (val & ESTATUS_1000_THALF)

            features |= SUPPORTED_1000baseT_Half;

        if (val & ESTATUS_1000_XFULL)

            features |= SUPPORTED_1000baseX_Full;

        if (val & ESTATUS_1000_XHALF)

            features |= SUPPORTED_1000baseX_Half;

    }

    phydev->supported &= features;

    phydev->advertising &= features;

    genphy_config_aneg(phydev);

    return 0;

}

/**

 * genphy_config_aneg - restart auto-negotiation or write BMCR

 * @phydev: target phy_device struct

 *

 * Description: If auto-negotiation is enabled, we configure the

 *   advertising, and then restart auto-negotiation.  If it is not

 *   enabled, then we write the BMCR.

 */

int genphy_config_aneg(struct phy_device *phydev)

{

    int result;

    int ival = 0;

    if (phydev->autoneg != AUTONEG_ENABLE)

        return genphy_setup_forced(phydev);

#if 0

    //set loopback

    //Reg 0

    ival |= (1 << 14 );

    ival |= (1 << 6 );

    ival &= ~(1 << 13 );

    ival &= ~(1 << 12 );

    ival |= (1 << 8 );

    phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, BMCR_ANENABLE & (~(1<<6)));

#endif

    printf("genphy_config_aneg ival = 0x%x,test1111.n",ival);

    result = genphy_config_advert(phydev);

    if (result < 0) /* error */

    {

        return result;

    }

    printf("genphy_config_aneg result=%d test2222.n",result);

    if (result == 0) {

        /*

         * Advertisment hasn't changed, but maybe aneg was never on to

         * begin with?  Or maybe phy was isolated?

         */

        int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);

        printf("genphy_config_aneg MII_BMCR, ctl=0x%xn",ctl);

        if (ctl < 0)

            return ctl;

        if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))

            result = 1; /* do restart aneg */

    }

    /*

     * Only restart aneg if we are advertising something different

     * than we were before.

     */

    if (result > 0)

    {

        printf("genphy_config_aneg test3333.n");

        result = genphy_restart_aneg(phydev);

    }

    return result;

}

3、编译之后，把u-boot.bin文件下载到板子，运行打印信息如下：

U-Boot 2018.07-linux4sam_6.0 (Oct 11 2020 - 23:57:20 -0700)

CPU: SAMA5D36

Crystal frequency:       12 MHz

CPU clock        :      528 MHz

Master clock     :      132 MHz

DRAM:  256 MiB

NAND:  256 MiB

MMC:   Atmel mci: 0, Atmel mci: 1

Loading Environment from NAND... OK

In:    serial@ffffee00

Out:   serial@ffffee00

Err:   serial@ffffee00

Netjack:   macb_eth_probe phy-mode=mii,devname=ethernet@f0028000

eth0: ethernet@f0028000 [PRIME]macb_eth_probe phy-mode=rmii,devname=ethernet@f802c000

, eth1: ethernet@f802c000

Hit any key to stop autoboot:  0 

=> pri

打印出phy-mode=rmii是从设备树里面读取的信息；

使用ping命令进行验证，是否能够正常通讯；

=> ping 192.168.2.108

CONFIG_DM_ETH _macb_init MACB_BIT(RMII) | MACB_BIT(CLKEN)

ethernet@f802c000: PHY present at 1,phy_id=0x22,macb->phy_addr=1

macb_phy_init name=ethernet@f802c000,phy_addr=1,ret=0

 ksz_8081_config MII_KSZPHY_CTRL(0x1f) =0x8180

 ksz_8081_config MII_KSZPHY_OMSO(0x16) =0x202

ethernet@f802c000: Starting autonegotiation...

ethernet@f802c000: Autonegotiation complete

ethernet@f802c000: link up, 100Mbps full-duplex (lpa: 0xcde1)

macb_phy_init udelay(3000)

Using ethernet@f802c000 device

gmacb send

ff ff ff ff ff ff aa ab c1 d2 e6 c6 08 06 00 01 08 00 06 04 00 01 aa ab c1 d2 e6 c6 c0 a8 01 64 00 00 00 00 00 00 c0 a8 02 6c 

 _macb_recv paddr=0x2fb6bec0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6bf40, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6bfc0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c040, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c0c0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c140, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c1c0, length=114,phy_addr=1

 _macb_recv paddr=0x2fb6c240, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c2c0, length=64,phy_addr=1