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drivers: net: xgene-v2: Add MDIO support
Added phy management support by using phy abstraction layer APIs. Signed-off-by: Iyappan Subramanian <isubramanian@apm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| /* | ||
| * Applied Micro X-Gene SoC Ethernet v2 Driver | ||
| * | ||
| * Copyright (c) 2017, Applied Micro Circuits Corporation | ||
| * Author(s): Iyappan Subramanian <isubramanian@apm.com> | ||
| * Keyur Chudgar <kchudgar@apm.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms of the GNU General Public License as published by the | ||
| * Free Software Foundation; either version 2 of the License, or (at your | ||
| * option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| #include "main.h" | ||
|
|
||
| static int xge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data) | ||
| { | ||
| struct xge_pdata *pdata = bus->priv; | ||
| u32 done, val = 0; | ||
| u8 wait = 10; | ||
|
|
||
| SET_REG_BITS(&val, PHY_ADDR, phy_id); | ||
| SET_REG_BITS(&val, REG_ADDR, reg); | ||
| xge_wr_csr(pdata, MII_MGMT_ADDRESS, val); | ||
|
|
||
| xge_wr_csr(pdata, MII_MGMT_CONTROL, data); | ||
| do { | ||
| usleep_range(5, 10); | ||
| done = xge_rd_csr(pdata, MII_MGMT_INDICATORS); | ||
| } while ((done & MII_MGMT_BUSY) && wait--); | ||
|
|
||
| if (done & MII_MGMT_BUSY) { | ||
| dev_err(&bus->dev, "MII_MGMT write failed\n"); | ||
| return -ETIMEDOUT; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static int xge_mdio_read(struct mii_bus *bus, int phy_id, int reg) | ||
| { | ||
| struct xge_pdata *pdata = bus->priv; | ||
| u32 data, done, val = 0; | ||
| u8 wait = 10; | ||
|
|
||
| SET_REG_BITS(&val, PHY_ADDR, phy_id); | ||
| SET_REG_BITS(&val, REG_ADDR, reg); | ||
| xge_wr_csr(pdata, MII_MGMT_ADDRESS, val); | ||
|
|
||
| xge_wr_csr(pdata, MII_MGMT_COMMAND, MII_READ_CYCLE); | ||
| do { | ||
| usleep_range(5, 10); | ||
| done = xge_rd_csr(pdata, MII_MGMT_INDICATORS); | ||
| } while ((done & MII_MGMT_BUSY) && wait--); | ||
|
|
||
| if (done & MII_MGMT_BUSY) { | ||
| dev_err(&bus->dev, "MII_MGMT read failed\n"); | ||
| return -ETIMEDOUT; | ||
| } | ||
|
|
||
| data = xge_rd_csr(pdata, MII_MGMT_STATUS); | ||
| xge_wr_csr(pdata, MII_MGMT_COMMAND, 0); | ||
|
|
||
| return data; | ||
| } | ||
|
|
||
| static void xge_adjust_link(struct net_device *ndev) | ||
| { | ||
| struct xge_pdata *pdata = netdev_priv(ndev); | ||
| struct phy_device *phydev = ndev->phydev; | ||
|
|
||
| if (phydev->link) { | ||
| if (pdata->phy_speed != phydev->speed) { | ||
| pdata->phy_speed = phydev->speed; | ||
| xge_mac_set_speed(pdata); | ||
| xge_mac_enable(pdata); | ||
| phy_print_status(phydev); | ||
| } | ||
| } else { | ||
| if (pdata->phy_speed != SPEED_UNKNOWN) { | ||
| pdata->phy_speed = SPEED_UNKNOWN; | ||
| xge_mac_disable(pdata); | ||
| phy_print_status(phydev); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void xge_mdio_remove(struct net_device *ndev) | ||
| { | ||
| struct xge_pdata *pdata = netdev_priv(ndev); | ||
| struct mii_bus *mdio_bus = pdata->mdio_bus; | ||
|
|
||
| if (ndev->phydev) | ||
| phy_disconnect(ndev->phydev); | ||
|
|
||
| if (mdio_bus->state == MDIOBUS_REGISTERED) | ||
| mdiobus_unregister(mdio_bus); | ||
|
|
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| mdiobus_free(mdio_bus); | ||
| } | ||
|
|
||
| int xge_mdio_config(struct net_device *ndev) | ||
| { | ||
| struct xge_pdata *pdata = netdev_priv(ndev); | ||
| struct device *dev = &pdata->pdev->dev; | ||
| struct mii_bus *mdio_bus; | ||
| struct phy_device *phydev; | ||
| int ret; | ||
|
|
||
| mdio_bus = mdiobus_alloc(); | ||
| if (!mdio_bus) | ||
| return -ENOMEM; | ||
|
|
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| mdio_bus->name = "APM X-Gene Ethernet (v2) MDIO Bus"; | ||
| mdio_bus->read = xge_mdio_read; | ||
| mdio_bus->write = xge_mdio_write; | ||
| mdio_bus->priv = pdata; | ||
| mdio_bus->parent = dev; | ||
| snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(dev)); | ||
| pdata->mdio_bus = mdio_bus; | ||
|
|
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| mdio_bus->phy_mask = 0x1; | ||
| ret = mdiobus_register(mdio_bus); | ||
| if (ret) | ||
| goto err; | ||
|
|
||
| phydev = phy_find_first(mdio_bus); | ||
| if (!phydev) { | ||
| dev_err(dev, "no PHY found\n"); | ||
| goto err; | ||
| } | ||
| phydev = phy_connect(ndev, phydev_name(phydev), | ||
| &xge_adjust_link, | ||
| pdata->resources.phy_mode); | ||
|
|
||
| if (IS_ERR(phydev)) { | ||
| netdev_err(ndev, "Could not attach to PHY\n"); | ||
| ret = PTR_ERR(phydev); | ||
| goto err; | ||
| } | ||
|
|
||
| phydev->supported &= ~(SUPPORTED_10baseT_Half | | ||
| SUPPORTED_10baseT_Full | | ||
| SUPPORTED_100baseT_Half | | ||
| SUPPORTED_100baseT_Full | | ||
| SUPPORTED_1000baseT_Half | | ||
| SUPPORTED_AUI | | ||
| SUPPORTED_MII | | ||
| SUPPORTED_FIBRE | | ||
| SUPPORTED_BNC); | ||
| phydev->advertising = phydev->supported; | ||
| pdata->phy_speed = SPEED_UNKNOWN; | ||
|
|
||
| return 0; | ||
| err: | ||
| xge_mdio_remove(ndev); | ||
|
|
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| return ret; | ||
| } |