FreeBSD/Linux Kernel Cross Reference
sys/mips/cavium/octe/ethernet-mv88e61xx.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    /*
     * Interface to the Marvell 88E61XX SMI/MDIO.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/endian.h>
    #include <sys/kernel.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    
    #include <dev/mii/mii.h>
    
    #include <net/ethernet.h>
    #include <net/if.h>
    #include <net/if_var.h>
    
    #include "wrapper-cvmx-includes.h"
    #include "ethernet-headers.h"
    
    #define MV88E61XX_SMI_REG_CMD   0x00    /* Indirect command register.  */
    #define  MV88E61XX_SMI_CMD_BUSY         0x8000  /* Busy bit.  */
    #define  MV88E61XX_SMI_CMD_22           0x1000  /* Clause 22 (default 45.)  */
    #define  MV88E61XX_SMI_CMD_READ         0x0800  /* Read command.  */
    #define  MV88E61XX_SMI_CMD_WRITE        0x0400  /* Write command.  */
    #define  MV88E61XX_SMI_CMD_PHY(phy)     (((phy) & 0x1f) << 5)
    #define  MV88E61XX_SMI_CMD_REG(reg)     ((reg) & 0x1f)
    
    #define MV88E61XX_SMI_REG_DAT   0x01    /* Indirect data register.  */
    
    static int cvm_oct_mv88e61xx_smi_read(struct ifnet *, int, int);
    static void cvm_oct_mv88e61xx_smi_write(struct ifnet *, int, int, int);
    static int cvm_oct_mv88e61xx_smi_wait(struct ifnet *);
    
    int
    cvm_oct_mv88e61xx_setup_device(struct ifnet *ifp)
    {
            cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
    
            priv->mdio_read = cvm_oct_mv88e61xx_smi_read;
            priv->mdio_write = cvm_oct_mv88e61xx_smi_write;
            priv->phy_device = "mv88e61xxphy";
    
            return (0);
    }
    
    static int
    cvm_oct_mv88e61xx_smi_read(struct ifnet *ifp, int phy_id, int location)
    {
            cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
            int error;
    
            error = cvm_oct_mv88e61xx_smi_wait(ifp);
            if (error != 0)
                    return (0);
    
            cvm_oct_mdio_write(ifp, priv->phy_id, MV88E61XX_SMI_REG_CMD,
                MV88E61XX_SMI_CMD_BUSY | MV88E61XX_SMI_CMD_22 |
                MV88E61XX_SMI_CMD_READ | MV88E61XX_SMI_CMD_PHY(phy_id) |
                MV88E61XX_SMI_CMD_REG(location));
    
            error = cvm_oct_mv88e61xx_smi_wait(ifp);
            if (error != 0)
                    return (0);
    
           return (cvm_oct_mdio_read(ifp, priv->phy_id, MV88E61XX_SMI_REG_DAT));
   }
   
   static void
   cvm_oct_mv88e61xx_smi_write(struct ifnet *ifp, int phy_id, int location, int val)
   {
           cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
   
           cvm_oct_mv88e61xx_smi_wait(ifp);
           cvm_oct_mdio_write(ifp, priv->phy_id, MV88E61XX_SMI_REG_DAT, val);
           cvm_oct_mdio_write(ifp, priv->phy_id, MV88E61XX_SMI_REG_CMD,
               MV88E61XX_SMI_CMD_BUSY | MV88E61XX_SMI_CMD_22 |
               MV88E61XX_SMI_CMD_WRITE | MV88E61XX_SMI_CMD_PHY(phy_id) |
               MV88E61XX_SMI_CMD_REG(location));
           cvm_oct_mv88e61xx_smi_wait(ifp);
   }
   
   static int
   cvm_oct_mv88e61xx_smi_wait(struct ifnet *ifp)
   {
           cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
           uint16_t cmd;
           unsigned i;
   
           for (i = 0; i < 10000; i++) {
                   cmd = cvm_oct_mdio_read(ifp, priv->phy_id, MV88E61XX_SMI_REG_CMD);
                   if ((cmd & MV88E61XX_SMI_CMD_BUSY) == 0)
                           return (0);
           }
           return (ETIMEDOUT);
   }

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