[Linux bottom layer] U-boot ksz8081 network driver debugging

Micrel is an excellent PHY chip. For more information about the chip, please refer to:

[Datasheet PHY] ksz8081 datasheet interpretation

System version: Ubuntu18.04-64

Compiler version: gcc version 7.4.0 (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04.1)

uboot version: 2018.07-linux4sam_6.0

Board model: at91sama5d3x-xplained

MCU model: sama5d36

Very similar to ksz9031, the public part can be referenced:

1. How to find the default configuration file path of the uboot official website development board

2. How to configure public information

3. How to check the parameters of the development board hardware

4. How to tailor the uboot function

5. Device tree file storage location and IO configuration

6. Network card initialization process, how to call the driver file interface at the program entry;

[Linux bottom layer] U-boot ksz9031 network driver debugging

Follow the WeChat public account and reply "ksz8081 driver" to download the driver source code of ksz8081 for free.

The hardware reference diagram is as follows:

1. Device tree changes

phy-mode = "rmii"; The interface mode of PHY is RMII. A 50MHZ clock needs to be provided externally, or through internal frequency multiplication;

gpios, because of the hardware design, the power supply and RST of the chip are controlled separately, which can reset the chip or perform power-on and power-off operations; it can be called at the application layer;

            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. Driver initialization function entry

#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 crystal

static struct phy_driver KSZ8081_driver = {

    .name = "Micrel KSZ8081",

    .uid = 0x221560,

    .mask = 0xfffff0,

    .features = PHY_BASIC_FEATURES,

    .config = &ksz_8081_config, //The configuration function has been reconstructed because the external crystal oscillator uses a 50M crystal oscillator and the official website uses a 25M crystal oscillator

    .startup = &genphy_startup,

    .shutdown = &genphy_shutdown,

};

static int ksz_8081_config(struct phy_device *phydev)

{

    int ret;

    int regval;

    //50M crystal oscillator configuration

    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 right;

    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,

            right);

    if (ret < 0)

        return right;

    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. After compiling, download the u-boot.bin file to the board and run it to print the following information:

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 

=> at

Printing out phy-mode=rmii is information read from the device tree;

Use the ping command to verify whether communication is normal;

=> 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

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=0x2fb6c340, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6c3c0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c4c0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c5c0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6c640, length=96,phy_addr=1

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=0x2fb6c740, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6c7c0, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6c840, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6c8c0, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6c940, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6c9c0, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6cac0, length=64,phy_addr=1

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=0x2fb6cb40, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6cbc0, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6cc40, length=96,phy_addr=1

 _macb_recv paddr=0x2fb6ccc0, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6cd41, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6cdc3, length=64,phy_addr=1

 _macb_recv paddr=0x2fb6be41, length=64,phy_addr=1

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