The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 /*
   32  * Interface to the Marvell 88E61XX SMI/MDIO.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/bus.h>
   41 #include <sys/endian.h>
   42 #include <sys/kernel.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/socket.h>
   45 
   46 #include <dev/mii/mii.h>
   47 
   48 #include <net/ethernet.h>
   49 #include <net/if.h>
   50 #include <net/if_var.h>
   51 
   52 #include "wrapper-cvmx-includes.h"
   53 #include "ethernet-headers.h"
   54 
   55 #define MV88E61XX_SMI_REG_CMD   0x00    /* Indirect command register.  */
   56 #define  MV88E61XX_SMI_CMD_BUSY         0x8000  /* Busy bit.  */
   57 #define  MV88E61XX_SMI_CMD_22           0x1000  /* Clause 22 (default 45.)  */
   58 #define  MV88E61XX_SMI_CMD_READ         0x0800  /* Read command.  */
   59 #define  MV88E61XX_SMI_CMD_WRITE        0x0400  /* Write command.  */
   60 #define  MV88E61XX_SMI_CMD_PHY(phy)     (((phy) & 0x1f) << 5)
   61 #define  MV88E61XX_SMI_CMD_REG(reg)     ((reg) & 0x1f)
   62 
   63 #define MV88E61XX_SMI_REG_DAT   0x01    /* Indirect data register.  */
   64 
   65 static int cvm_oct_mv88e61xx_smi_read(struct ifnet *, int, int);
   66 static void cvm_oct_mv88e61xx_smi_write(struct ifnet *, int, int, int);
   67 static int cvm_oct_mv88e61xx_smi_wait(struct ifnet *);
   68 
   69 int
   70 cvm_oct_mv88e61xx_setup_device(struct ifnet *ifp)
   71 {
   72         cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
   73 
   74         priv->mdio_read = cvm_oct_mv88e61xx_smi_read;
   75         priv->mdio_write = cvm_oct_mv88e61xx_smi_write;
   76         priv->phy_device = "mv88e61xxphy";
   77 
   78         return (0);
   79 }
   80 
   81 static int
   82 cvm_oct_mv88e61xx_smi_read(struct ifnet *ifp, int phy_id, int location)
   83 {
   84         cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
   85         int error;
   86 
   87         error = cvm_oct_mv88e61xx_smi_wait(ifp);
   88         if (error != 0)
   89                 return (0);
   90 
   91         cvm_oct_mdio_write(ifp, priv->phy_id, MV88E61XX_SMI_REG_CMD,
   92             MV88E61XX_SMI_CMD_BUSY | MV88E61XX_SMI_CMD_22 |
   93             MV88E61XX_SMI_CMD_READ | MV88E61XX_SMI_CMD_PHY(phy_id) |
   94             MV88E61XX_SMI_CMD_REG(location));
   95 
   96         error = cvm_oct_mv88e61xx_smi_wait(ifp);
   97         if (error != 0)
   98                 return (0);
   99 
  100         return (cvm_oct_mdio_read(ifp, priv->phy_id, MV88E61XX_SMI_REG_DAT));
  101 }
  102 
  103 static void
  104 cvm_oct_mv88e61xx_smi_write(struct ifnet *ifp, int phy_id, int location, int val)
  105 {
  106         cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
  107 
  108         cvm_oct_mv88e61xx_smi_wait(ifp);
  109         cvm_oct_mdio_write(ifp, priv->phy_id, MV88E61XX_SMI_REG_DAT, val);
  110         cvm_oct_mdio_write(ifp, priv->phy_id, MV88E61XX_SMI_REG_CMD,
  111             MV88E61XX_SMI_CMD_BUSY | MV88E61XX_SMI_CMD_22 |
  112             MV88E61XX_SMI_CMD_WRITE | MV88E61XX_SMI_CMD_PHY(phy_id) |
  113             MV88E61XX_SMI_CMD_REG(location));
  114         cvm_oct_mv88e61xx_smi_wait(ifp);
  115 }
  116 
  117 static int
  118 cvm_oct_mv88e61xx_smi_wait(struct ifnet *ifp)
  119 {
  120         cvm_oct_private_t *priv = (cvm_oct_private_t *)ifp->if_softc;
  121         uint16_t cmd;
  122         unsigned i;
  123 
  124         for (i = 0; i < 10000; i++) {
  125                 cmd = cvm_oct_mdio_read(ifp, priv->phy_id, MV88E61XX_SMI_REG_CMD);
  126                 if ((cmd & MV88E61XX_SMI_CMD_BUSY) == 0)
  127                         return (0);
  128         }
  129         return (ETIMEDOUT);
  130 }

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