2 * Applied Micro X-Gene SoC Ethernet v2 Driver
4 * Copyright (c) 2017, Applied Micro Circuits Corporation
5 * Author(s): Iyappan Subramanian <isubramanian@apm.com>
6 * Keyur Chudgar <kchudgar@apm.com>
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.
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.
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/>.
24 static int xge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
26 struct xge_pdata *pdata = bus->priv;
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);
34 xge_wr_csr(pdata, MII_MGMT_CONTROL, data);
37 done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
38 } while ((done & MII_MGMT_BUSY) && wait--);
40 if (done & MII_MGMT_BUSY) {
41 dev_err(&bus->dev, "MII_MGMT write failed\n");
48 static int xge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
50 struct xge_pdata *pdata = bus->priv;
51 u32 data, done, val = 0;
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);
58 xge_wr_csr(pdata, MII_MGMT_COMMAND, MII_READ_CYCLE);
61 done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
62 } while ((done & MII_MGMT_BUSY) && wait--);
64 if (done & MII_MGMT_BUSY) {
65 dev_err(&bus->dev, "MII_MGMT read failed\n");
69 data = xge_rd_csr(pdata, MII_MGMT_STATUS);
70 xge_wr_csr(pdata, MII_MGMT_COMMAND, 0);
75 static void xge_adjust_link(struct net_device *ndev)
77 struct xge_pdata *pdata = netdev_priv(ndev);
78 struct phy_device *phydev = ndev->phydev;
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);
88 if (pdata->phy_speed != SPEED_UNKNOWN) {
89 pdata->phy_speed = SPEED_UNKNOWN;
90 xge_mac_disable(pdata);
91 phy_print_status(phydev);
96 void xge_mdio_remove(struct net_device *ndev)
98 struct xge_pdata *pdata = netdev_priv(ndev);
99 struct mii_bus *mdio_bus = pdata->mdio_bus;
102 phy_disconnect(ndev->phydev);
104 if (mdio_bus->state == MDIOBUS_REGISTERED)
105 mdiobus_unregister(mdio_bus);
107 mdiobus_free(mdio_bus);
110 int xge_mdio_config(struct net_device *ndev)
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;
118 mdio_bus = mdiobus_alloc();
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;
130 mdio_bus->phy_mask = 0x1;
131 ret = mdiobus_register(mdio_bus);
135 phydev = phy_find_first(mdio_bus);
137 dev_err(dev, "no PHY found\n");
141 phydev = phy_connect(ndev, phydev_name(phydev),
143 pdata->resources.phy_mode);
145 if (IS_ERR(phydev)) {
146 netdev_err(ndev, "Could not attach to PHY\n");
147 ret = PTR_ERR(phydev);
151 phydev->supported &= ~(SUPPORTED_10baseT_Half |
152 SUPPORTED_10baseT_Full |
153 SUPPORTED_100baseT_Half |
154 SUPPORTED_100baseT_Full |
155 SUPPORTED_1000baseT_Half |
160 phydev->advertising = phydev->supported;
161 pdata->phy_speed = SPEED_UNKNOWN;
165 xge_mdio_remove(ndev);