--- /dev/null
+// 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");
projects / linux-2.6-microblaze.git / commitdiff