drivers/staging/octeon/ethernet-mdio.c

   1 /**********************************************************************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2007 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26 **********************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/ethtool.h>
  29 #include <linux/mii.h>
  30 #include <net/dst.h>
  31
  32 #include <asm/octeon/octeon.h>
  33
  34 #include "ethernet-defines.h"
  35 #include "octeon-ethernet.h"
  36 #include "ethernet-mdio.h"
  37
  38 #include "cvmx-helper-board.h"
  39
  40 #include "cvmx-smix-defs.h"
  41
  42 DECLARE_MUTEX(mdio_sem);
  43
  44 /**
  45  * Perform an MII read. Called by the generic MII routines
  46  *
  47  * @dev:      Device to perform read for
  48  * @phy_id:   The MII phy id
  49  * @location: Register location to read
  50  * Returns Result from the read or zero on failure
  51  */
  52 static int cvm_oct_mdio_read(struct net_device *dev, int phy_id, int location)
  53 {
  54         union cvmx_smix_cmd smi_cmd;
  55         union cvmx_smix_rd_dat smi_rd;
  56
  57         smi_cmd.u64 = 0;
  58         smi_cmd.s.phy_op = 1;
  59         smi_cmd.s.phy_adr = phy_id;
  60         smi_cmd.s.reg_adr = location;
  61         cvmx_write_csr(CVMX_SMIX_CMD(0), smi_cmd.u64);
  62
  63         do {
  64                 if (!in_interrupt())
  65                         yield();
  66                 smi_rd.u64 = cvmx_read_csr(CVMX_SMIX_RD_DAT(0));
  67         } while (smi_rd.s.pending);
  68
  69         if (smi_rd.s.val)
  70                 return smi_rd.s.dat;
  71         else
  72                 return 0;
  73 }
  74
  75 static int cvm_oct_mdio_dummy_read(struct net_device *dev, int phy_id,
  76                                    int location)
  77 {
  78         return 0xffff;
  79 }
  80
  81 /**
  82  * Perform an MII write. Called by the generic MII routines
  83  *
  84  * @dev:      Device to perform write for
  85  * @phy_id:   The MII phy id
  86  * @location: Register location to write
  87  * @val:      Value to write
  88  */
  89 static void cvm_oct_mdio_write(struct net_device *dev, int phy_id, int location,
  90                                int val)
  91 {
  92         union cvmx_smix_cmd smi_cmd;
  93         union cvmx_smix_wr_dat smi_wr;
  94
  95         smi_wr.u64 = 0;
  96         smi_wr.s.dat = val;
  97         cvmx_write_csr(CVMX_SMIX_WR_DAT(0), smi_wr.u64);
  98
  99         smi_cmd.u64 = 0;
 100         smi_cmd.s.phy_op = 0;
 101         smi_cmd.s.phy_adr = phy_id;
 102         smi_cmd.s.reg_adr = location;
 103         cvmx_write_csr(CVMX_SMIX_CMD(0), smi_cmd.u64);
 104
 105         do {
 106                 if (!in_interrupt())
 107                         yield();
 108                 smi_wr.u64 = cvmx_read_csr(CVMX_SMIX_WR_DAT(0));
 109         } while (smi_wr.s.pending);
 110 }
 111
 112 static void cvm_oct_mdio_dummy_write(struct net_device *dev, int phy_id,
 113                                      int location, int val)
 114 {
 115 }
 116
 117 static void cvm_oct_get_drvinfo(struct net_device *dev,
 118                                 struct ethtool_drvinfo *info)
 119 {
 120         strcpy(info->driver, "cavium-ethernet");
 121         strcpy(info->version, OCTEON_ETHERNET_VERSION);
 122         strcpy(info->bus_info, "Builtin");
 123 }
 124
 125 static int cvm_oct_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 126 {
 127         struct octeon_ethernet *priv = netdev_priv(dev);
 128         int ret;
 129
 130         down(&mdio_sem);
 131         ret = mii_ethtool_gset(&priv->mii_info, cmd);
 132         up(&mdio_sem);
 133
 134         return ret;
 135 }
 136
 137 static int cvm_oct_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 138 {
 139         struct octeon_ethernet *priv = netdev_priv(dev);
 140         int ret;
 141
 142         down(&mdio_sem);
 143         ret = mii_ethtool_sset(&priv->mii_info, cmd);
 144         up(&mdio_sem);
 145
 146         return ret;
 147 }
 148
 149 static int cvm_oct_nway_reset(struct net_device *dev)
 150 {
 151         struct octeon_ethernet *priv = netdev_priv(dev);
 152         int ret;
 153
 154         down(&mdio_sem);
 155         ret = mii_nway_restart(&priv->mii_info);
 156         up(&mdio_sem);
 157
 158         return ret;
 159 }
 160
 161 static u32 cvm_oct_get_link(struct net_device *dev)
 162 {
 163         struct octeon_ethernet *priv = netdev_priv(dev);
 164         u32 ret;
 165
 166         down(&mdio_sem);
 167         ret = mii_link_ok(&priv->mii_info);
 168         up(&mdio_sem);
 169
 170         return ret;
 171 }
 172
 173 struct ethtool_ops cvm_oct_ethtool_ops = {
 174         .get_drvinfo = cvm_oct_get_drvinfo,
 175         .get_settings = cvm_oct_get_settings,
 176         .set_settings = cvm_oct_set_settings,
 177         .nway_reset = cvm_oct_nway_reset,
 178         .get_link = cvm_oct_get_link,
 179         .get_sg = ethtool_op_get_sg,
 180         .get_tx_csum = ethtool_op_get_tx_csum,
 181 };
 182
 183 /**
 184  * IOCTL support for PHY control
 185  *
 186  * @dev:    Device to change
 187  * @rq:     the request
 188  * @cmd:    the command
 189  * Returns Zero on success
 190  */
 191 int cvm_oct_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 192 {
 193         struct octeon_ethernet *priv = netdev_priv(dev);
 194         struct mii_ioctl_data *data = if_mii(rq);
 195         unsigned int duplex_chg;
 196         int ret;
 197
 198         down(&mdio_sem);
 199         ret = generic_mii_ioctl(&priv->mii_info, data, cmd, &duplex_chg);
 200         up(&mdio_sem);
 201
 202         return ret;
 203 }
 204
 205 /**
 206  * Setup the MDIO device structures
 207  *
 208  * @dev:    Device to setup
 209  *
 210  * Returns Zero on success, negative on failure
 211  */
 212 int cvm_oct_mdio_setup_device(struct net_device *dev)
 213 {
 214         struct octeon_ethernet *priv = netdev_priv(dev);
 215         int phy_id = cvmx_helper_board_get_mii_address(priv->port);
 216         if (phy_id != -1) {
 217                 priv->mii_info.dev = dev;
 218                 priv->mii_info.phy_id = phy_id;
 219                 priv->mii_info.phy_id_mask = 0xff;
 220                 priv->mii_info.supports_gmii = 1;
 221                 priv->mii_info.reg_num_mask = 0x1f;
 222                 priv->mii_info.mdio_read = cvm_oct_mdio_read;
 223                 priv->mii_info.mdio_write = cvm_oct_mdio_write;
 224         } else {
 225                 /* Supply dummy MDIO routines so the kernel won't crash
 226                    if the user tries to read them */
 227                 priv->mii_info.mdio_read = cvm_oct_mdio_dummy_read;
 228                 priv->mii_info.mdio_write = cvm_oct_mdio_dummy_write;
 229         }
 230         return 0;
 231 }