diff options
Diffstat (limited to 'drivers/net/phy/marvell-88q2xxx.c')
| -rw-r--r-- | drivers/net/phy/marvell-88q2xxx.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/net/phy/marvell-88q2xxx.c b/drivers/net/phy/marvell-88q2xxx.c new file mode 100644 index 000000000000..1c3ff77de56b --- /dev/null +++ b/drivers/net/phy/marvell-88q2xxx.c @@ -0,0 +1,263 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Marvell 88Q2XXX automotive 100BASE-T1/1000BASE-T1 PHY driver + */ +#include <linux/ethtool_netlink.h> +#include <linux/marvell_phy.h> +#include <linux/phy.h> + +#define MDIO_MMD_AN_MV_STAT 32769 +#define MDIO_MMD_AN_MV_STAT_ANEG 0x0100 +#define MDIO_MMD_AN_MV_STAT_LOCAL_RX 0x1000 +#define MDIO_MMD_AN_MV_STAT_REMOTE_RX 0x2000 +#define MDIO_MMD_AN_MV_STAT_LOCAL_MASTER 0x4000 +#define MDIO_MMD_AN_MV_STAT_MS_CONF_FAULT 0x8000 + +#define MDIO_MMD_PCS_MV_100BT1_STAT1 33032 +#define MDIO_MMD_PCS_MV_100BT1_STAT1_IDLE_ERROR 0x00FF +#define MDIO_MMD_PCS_MV_100BT1_STAT1_JABBER 0x0100 +#define MDIO_MMD_PCS_MV_100BT1_STAT1_LINK 0x0200 +#define MDIO_MMD_PCS_MV_100BT1_STAT1_LOCAL_RX 0x1000 +#define MDIO_MMD_PCS_MV_100BT1_STAT1_REMOTE_RX 0x2000 +#define MDIO_MMD_PCS_MV_100BT1_STAT1_LOCAL_MASTER 0x4000 + +#define MDIO_MMD_PCS_MV_100BT1_STAT2 33033 +#define MDIO_MMD_PCS_MV_100BT1_STAT2_JABBER 0x0001 +#define MDIO_MMD_PCS_MV_100BT1_STAT2_POL 0x0002 +#define MDIO_MMD_PCS_MV_100BT1_STAT2_LINK 0x0004 +#define MDIO_MMD_PCS_MV_100BT1_STAT2_ANGE 0x0008 + +static int mv88q2xxx_soft_reset(struct phy_device *phydev) +{ + int ret; + int val; + + ret = phy_write_mmd(phydev, MDIO_MMD_PCS, + MDIO_PCS_1000BT1_CTRL, MDIO_PCS_1000BT1_CTRL_RESET); + if (ret < 0) + return ret; + + return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PCS, + MDIO_PCS_1000BT1_CTRL, val, + !(val & MDIO_PCS_1000BT1_CTRL_RESET), + 50000, 600000, true); +} + +static int mv88q2xxx_read_link_gbit(struct phy_device *phydev) +{ + int ret; + bool link = false; + + /* Read vendor specific Auto-Negotiation status register to get local + * and remote receiver status according to software initialization + * guide. + */ + ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_MMD_AN_MV_STAT); + if (ret < 0) { + return ret; + } else if ((ret & MDIO_MMD_AN_MV_STAT_LOCAL_RX) && + (ret & MDIO_MMD_AN_MV_STAT_REMOTE_RX)) { + /* The link state is latched low so that momentary link + * drops can be detected. Do not double-read the status + * in polling mode to detect such short link drops except + * the link was already down. + */ + if (!phy_polling_mode(phydev) || !phydev->link) { + ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_1000BT1_STAT); + if (ret < 0) + return ret; + else if (ret & MDIO_PCS_1000BT1_STAT_LINK) + link = true; + } + + if (!link) { + ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_1000BT1_STAT); + if (ret < 0) + return ret; + else if (ret & MDIO_PCS_1000BT1_STAT_LINK) + link = true; + } + } + + phydev->link = link; + + return 0; +} + +static int mv88q2xxx_read_link_100m(struct phy_device *phydev) +{ + int ret; + + /* The link state is latched low so that momentary link + * drops can be detected. Do not double-read the status + * in polling mode to detect such short link drops except + * the link was already down. In case we are not polling, + * we always read the realtime status. + */ + if (!phy_polling_mode(phydev) || !phydev->link) { + ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_MMD_PCS_MV_100BT1_STAT1); + if (ret < 0) + return ret; + else if (ret & MDIO_MMD_PCS_MV_100BT1_STAT1_LINK) + goto out; + } + + ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_MMD_PCS_MV_100BT1_STAT1); + if (ret < 0) + return ret; + +out: + /* Check if we have link and if the remote and local receiver are ok */ + if ((ret & MDIO_MMD_PCS_MV_100BT1_STAT1_LINK) && + (ret & MDIO_MMD_PCS_MV_100BT1_STAT1_LOCAL_RX) && + (ret & MDIO_MMD_PCS_MV_100BT1_STAT1_REMOTE_RX)) + phydev->link = true; + else + phydev->link = false; + + return 0; +} + +static int mv88q2xxx_read_link(struct phy_device *phydev) +{ + int ret; + + /* The 88Q2XXX PHYs do not have the PMA/PMD status register available, + * therefore we need to read the link status from the vendor specific + * registers depending on the speed. + */ + if (phydev->speed == SPEED_1000) + ret = mv88q2xxx_read_link_gbit(phydev); + else + ret = mv88q2xxx_read_link_100m(phydev); + + return ret; +} + +static int mv88q2xxx_read_status(struct phy_device *phydev) +{ + int ret; + + ret = mv88q2xxx_read_link(phydev); + if (ret < 0) + return ret; + + return genphy_c45_read_pma(phydev); +} + +static int mv88q2xxx_get_features(struct phy_device *phydev) +{ + int ret; + + ret = genphy_c45_pma_read_abilities(phydev); + if (ret) + return ret; + + /* We need to read the baset1 extended abilities manually because the + * PHY does not signalize it has the extended abilities register + * available. + */ + ret = genphy_c45_pma_baset1_read_abilities(phydev); + if (ret) + return ret; + + /* The PHY signalizes it supports autonegotiation. Unfortunately, so + * far it was not possible to get a link even when following the init + * sequence provided by Marvell. Disable it for now until a proper + * workaround is found or a new PHY revision is released. + */ + linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported); + + return 0; +} + +static int mv88q2xxx_config_aneg(struct phy_device *phydev) +{ + int ret; + + ret = genphy_c45_config_aneg(phydev); + if (ret) + return ret; + + return mv88q2xxx_soft_reset(phydev); +} + +static int mv88q2xxx_config_init(struct phy_device *phydev) +{ + int ret; + + /* The 88Q2XXX PHYs do have the extended ability register available, but + * register MDIO_PMA_EXTABLE where they should signalize it does not + * work according to specification. Therefore, we force it here. + */ + phydev->pma_extable = MDIO_PMA_EXTABLE_BT1; + + /* Read the current PHY configuration */ + ret = genphy_c45_read_pma(phydev); + if (ret) + return ret; + + return mv88q2xxx_config_aneg(phydev); +} + +static int mv88q2xxxx_get_sqi(struct phy_device *phydev) +{ + int ret; + + if (phydev->speed == SPEED_100) { + /* Read the SQI from the vendor specific receiver status + * register + */ + ret = phy_read_mmd(phydev, MDIO_MMD_PCS, 0x8230); + if (ret < 0) + return ret; + + ret = ret >> 12; + } else { + /* Read from vendor specific registers, they are not documented + * but can be found in the Software Initialization Guide. Only + * revisions >= A0 are supported. + */ + ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, 0xFC5D, 0x00FF, 0x00AC); + if (ret < 0) + return ret; + + ret = phy_read_mmd(phydev, MDIO_MMD_PCS, 0xfc88); + if (ret < 0) + return ret; + } + + return ret & 0x0F; +} + +static int mv88q2xxxx_get_sqi_max(struct phy_device *phydev) +{ + return 15; +} + +static struct phy_driver mv88q2xxx_driver[] = { + { + .phy_id = MARVELL_PHY_ID_88Q2110, + .phy_id_mask = MARVELL_PHY_ID_MASK, + .name = "mv88q2110", + .get_features = mv88q2xxx_get_features, + .config_aneg = mv88q2xxx_config_aneg, + .config_init = mv88q2xxx_config_init, + .read_status = mv88q2xxx_read_status, + .soft_reset = mv88q2xxx_soft_reset, + .set_loopback = genphy_c45_loopback, + .get_sqi = mv88q2xxxx_get_sqi, + .get_sqi_max = mv88q2xxxx_get_sqi_max, + }, +}; + +module_phy_driver(mv88q2xxx_driver); + +static struct mdio_device_id __maybe_unused mv88q2xxx_tbl[] = { + { MARVELL_PHY_ID_88Q2110, MARVELL_PHY_ID_MASK }, + { /*sentinel*/ } +}; +MODULE_DEVICE_TABLE(mdio, mv88q2xxx_tbl); + +MODULE_DESCRIPTION("Marvell 88Q2XXX 100/1000BASE-T1 Automotive Ethernet PHY driver"); +MODULE_LICENSE("GPL"); |