lkml.org 
[lkml]   [2022]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH] net: mv643xx_eth: support MII/GMII/RGMII modes
    Date
    On device reset all ports are automatically set to RGMII mode. MII
    mode must be explicitly enabled.

    If SoC has two Ethernet controllers, by setting both of them into MII
    mode, the first controller enters GMII mode, while the second
    controller is effectively disabled. This requires configuring (and
    maybe enabling) the second controller in the device tree, even though
    it cannot be used.

    Signed-off-by: David Yang <mmyangfl@gmail.com>
    ---
    drivers/net/ethernet/marvell/mv643xx_eth.c | 16 ++++++++++++++++
    1 file changed, 16 insertions(+)

    diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
    index b6be0552a..e2216ce5e 100644
    --- a/drivers/net/ethernet/marvell/mv643xx_eth.c
    +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
    @@ -108,6 +108,7 @@ static char mv643xx_eth_driver_version[] = "1.4";
    #define TXQ_COMMAND 0x0048
    #define TXQ_FIX_PRIO_CONF 0x004c
    #define PORT_SERIAL_CONTROL1 0x004c
    +#define RGMII_EN 0x00000008
    #define CLK125_BYPASS_EN 0x00000010
    #define TX_BW_RATE 0x0050
    #define TX_BW_MTU 0x0058
    @@ -1245,6 +1246,21 @@ static void mv643xx_eth_adjust_link(struct net_device *dev)

    out_write:
    wrlp(mp, PORT_SERIAL_CONTROL, pscr);
    +
    + /* If two Ethernet controllers present in the SoC, MII modes follow the
    + * following matrix:
    + *
    + * Port0 Mode Port1 Mode Port0 RGMII_EN Port1 RGMII_EN
    + * RGMII RGMII 1 1
    + * RGMII MII/MMII 1 0
    + * MII/MMII RGMII 0 1
    + * GMII N/A 0 0
    + *
    + * To enable GMII on Port 0, Port 1 must also disable RGMII_EN too.
    + */
    + if (!phy_interface_is_rgmii(dev->phydev))
    + wrlp(mp, PORT_SERIAL_CONTROL1,
    + rdlp(mp, PORT_SERIAL_CONTROL1) & ~RGMII_EN);
    }

    /* statistics ***************************************************************/
    --
    2.35.1
    \
     
     \ /
      Last update: 2022-09-30 21:51    [W:3.293 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site