1 /* 2 * Applied Micro X-Gene SoC Ethernet v2 Driver 3 * 4 * Copyright (c) 2017, Applied Micro Circuits Corporation 5 * Author(s): Iyappan Subramanian <isubramanian@apm.com> 6 * Keyur Chudgar <kchudgar@apm.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program. If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "main.h" 23 24 static int xge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data) 25 { 26 struct xge_pdata *pdata = bus->priv; 27 u32 done, val = 0; 28 u8 wait = 10; 29 30 SET_REG_BITS(&val, PHY_ADDR, phy_id); 31 SET_REG_BITS(&val, REG_ADDR, reg); 32 xge_wr_csr(pdata, MII_MGMT_ADDRESS, val); 33 34 xge_wr_csr(pdata, MII_MGMT_CONTROL, data); 35 do { 36 usleep_range(5, 10); 37 done = xge_rd_csr(pdata, MII_MGMT_INDICATORS); 38 } while ((done & MII_MGMT_BUSY) && wait--); 39 40 if (done & MII_MGMT_BUSY) { 41 dev_err(&bus->dev, "MII_MGMT write failed\n"); 42 return -ETIMEDOUT; 43 } 44 45 return 0; 46 } 47 48 static int xge_mdio_read(struct mii_bus *bus, int phy_id, int reg) 49 { 50 struct xge_pdata *pdata = bus->priv; 51 u32 data, done, val = 0; 52 u8 wait = 10; 53 54 SET_REG_BITS(&val, PHY_ADDR, phy_id); 55 SET_REG_BITS(&val, REG_ADDR, reg); 56 xge_wr_csr(pdata, MII_MGMT_ADDRESS, val); 57 58 xge_wr_csr(pdata, MII_MGMT_COMMAND, MII_READ_CYCLE); 59 do { 60 usleep_range(5, 10); 61 done = xge_rd_csr(pdata, MII_MGMT_INDICATORS); 62 } while ((done & MII_MGMT_BUSY) && wait--); 63 64 if (done & MII_MGMT_BUSY) { 65 dev_err(&bus->dev, "MII_MGMT read failed\n"); 66 return -ETIMEDOUT; 67 } 68 69 data = xge_rd_csr(pdata, MII_MGMT_STATUS); 70 xge_wr_csr(pdata, MII_MGMT_COMMAND, 0); 71 72 return data; 73 } 74 75 static void xge_adjust_link(struct net_device *ndev) 76 { 77 struct xge_pdata *pdata = netdev_priv(ndev); 78 struct phy_device *phydev = ndev->phydev; 79 80 if (phydev->link) { 81 if (pdata->phy_speed != phydev->speed) { 82 pdata->phy_speed = phydev->speed; 83 xge_mac_set_speed(pdata); 84 xge_mac_enable(pdata); 85 phy_print_status(phydev); 86 } 87 } else { 88 if (pdata->phy_speed != SPEED_UNKNOWN) { 89 pdata->phy_speed = SPEED_UNKNOWN; 90 xge_mac_disable(pdata); 91 phy_print_status(phydev); 92 } 93 } 94 } 95 96 void xge_mdio_remove(struct net_device *ndev) 97 { 98 struct xge_pdata *pdata = netdev_priv(ndev); 99 struct mii_bus *mdio_bus = pdata->mdio_bus; 100 101 if (ndev->phydev) 102 phy_disconnect(ndev->phydev); 103 104 if (mdio_bus->state == MDIOBUS_REGISTERED) 105 mdiobus_unregister(mdio_bus); 106 107 mdiobus_free(mdio_bus); 108 } 109 110 int xge_mdio_config(struct net_device *ndev) 111 { 112 struct xge_pdata *pdata = netdev_priv(ndev); 113 struct device *dev = &pdata->pdev->dev; 114 struct mii_bus *mdio_bus; 115 struct phy_device *phydev; 116 int ret; 117 118 mdio_bus = mdiobus_alloc(); 119 if (!mdio_bus) 120 return -ENOMEM; 121 122 mdio_bus->name = "APM X-Gene Ethernet (v2) MDIO Bus"; 123 mdio_bus->read = xge_mdio_read; 124 mdio_bus->write = xge_mdio_write; 125 mdio_bus->priv = pdata; 126 mdio_bus->parent = dev; 127 snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(dev)); 128 pdata->mdio_bus = mdio_bus; 129 130 mdio_bus->phy_mask = 0x1; 131 ret = mdiobus_register(mdio_bus); 132 if (ret) 133 goto err; 134 135 phydev = phy_find_first(mdio_bus); 136 if (!phydev) { 137 dev_err(dev, "no PHY found\n"); 138 ret = -ENODEV; 139 goto err; 140 } 141 phydev = phy_connect(ndev, phydev_name(phydev), 142 &xge_adjust_link, 143 pdata->resources.phy_mode); 144 145 if (IS_ERR(phydev)) { 146 netdev_err(ndev, "Could not attach to PHY\n"); 147 ret = PTR_ERR(phydev); 148 goto err; 149 } 150 151 phydev->supported &= ~(SUPPORTED_10baseT_Half | 152 SUPPORTED_10baseT_Full | 153 SUPPORTED_100baseT_Half | 154 SUPPORTED_100baseT_Full | 155 SUPPORTED_1000baseT_Half | 156 SUPPORTED_AUI | 157 SUPPORTED_MII | 158 SUPPORTED_FIBRE | 159 SUPPORTED_BNC); 160 phydev->advertising = phydev->supported; 161 pdata->phy_speed = SPEED_UNKNOWN; 162 163 return 0; 164 err: 165 xge_mdio_remove(ndev); 166 167 return ret; 168 } 169