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-rw-r--r--drivers/net/phy/dp83tg720.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/net/phy/dp83tg720.c b/drivers/net/phy/dp83tg720.c
new file mode 100644
index 0000000000..326c9770a6
--- /dev/null
+++ b/drivers/net/phy/dp83tg720.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Driver for the Texas Instruments DP83TG720 PHY
+ * Copyright (c) 2023 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
+ */
+#include <linux/bitfield.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/phy.h>
+
+#define DP83TG720S_PHY_ID 0x2000a284
+
+/* MDIO_MMD_VEND2 registers */
+#define DP83TG720S_MII_REG_10 0x10
+#define DP83TG720S_STS_MII_INT BIT(7)
+#define DP83TG720S_LINK_STATUS BIT(0)
+
+#define DP83TG720S_PHY_RESET 0x1f
+#define DP83TG720S_HW_RESET BIT(15)
+
+#define DP83TG720S_RGMII_DELAY_CTRL 0x602
+/* In RGMII mode, Enable or disable the internal delay for RXD */
+#define DP83TG720S_RGMII_RX_CLK_SEL BIT(1)
+/* In RGMII mode, Enable or disable the internal delay for TXD */
+#define DP83TG720S_RGMII_TX_CLK_SEL BIT(0)
+
+#define DP83TG720S_SQI_REG_1 0x871
+#define DP83TG720S_SQI_OUT_WORST GENMASK(7, 5)
+#define DP83TG720S_SQI_OUT GENMASK(3, 1)
+
+#define DP83TG720_SQI_MAX 7
+
+static int dp83tg720_config_aneg(struct phy_device *phydev)
+{
+ /* Autoneg is not supported and this PHY supports only one speed.
+ * We need to care only about master/slave configuration if it was
+ * changed by user.
+ */
+ return genphy_c45_pma_baset1_setup_master_slave(phydev);
+}
+
+static int dp83tg720_read_status(struct phy_device *phydev)
+{
+ u16 phy_sts;
+ int ret;
+
+ phydev->pause = 0;
+ phydev->asym_pause = 0;
+
+ /* Most of Clause 45 registers are not present, so we can't use
+ * genphy_c45_read_status() here.
+ */
+ phy_sts = phy_read(phydev, DP83TG720S_MII_REG_10);
+ phydev->link = !!(phy_sts & DP83TG720S_LINK_STATUS);
+ if (!phydev->link) {
+ /* According to the "DP83TC81x, DP83TG72x Software
+ * Implementation Guide", the PHY needs to be reset after a
+ * link loss or if no link is created after at least 100ms.
+ *
+ * Currently we are polling with the PHY_STATE_TIME (1000ms)
+ * interval, which is still enough for not automotive use cases.
+ */
+ ret = phy_init_hw(phydev);
+ if (ret)
+ return ret;
+
+ /* After HW reset we need to restore master/slave configuration.
+ */
+ ret = dp83tg720_config_aneg(phydev);
+ if (ret)
+ return ret;
+
+ phydev->speed = SPEED_UNKNOWN;
+ phydev->duplex = DUPLEX_UNKNOWN;
+ } else {
+ /* PMA/PMD control 1 register (Register 1.0) is present, but it
+ * doesn't contain the link speed information.
+ * So genphy_c45_read_pma() can't be used here.
+ */
+ ret = genphy_c45_pma_baset1_read_master_slave(phydev);
+ if (ret)
+ return ret;
+
+ phydev->duplex = DUPLEX_FULL;
+ phydev->speed = SPEED_1000;
+ }
+
+ return 0;
+}
+
+static int dp83tg720_get_sqi(struct phy_device *phydev)
+{
+ int ret;
+
+ if (!phydev->link)
+ return 0;
+
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TG720S_SQI_REG_1);
+ if (ret < 0)
+ return ret;
+
+ return FIELD_GET(DP83TG720S_SQI_OUT, ret);
+}
+
+static int dp83tg720_get_sqi_max(struct phy_device *phydev)
+{
+ return DP83TG720_SQI_MAX;
+}
+
+static int dp83tg720_config_rgmii_delay(struct phy_device *phydev)
+{
+ u16 rgmii_delay_mask;
+ u16 rgmii_delay = 0;
+
+ switch (phydev->interface) {
+ case PHY_INTERFACE_MODE_RGMII:
+ rgmii_delay = 0;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ rgmii_delay = DP83TG720S_RGMII_RX_CLK_SEL |
+ DP83TG720S_RGMII_TX_CLK_SEL;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ rgmii_delay = DP83TG720S_RGMII_RX_CLK_SEL;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ rgmii_delay = DP83TG720S_RGMII_TX_CLK_SEL;
+ break;
+ default:
+ return 0;
+ }
+
+ rgmii_delay_mask = DP83TG720S_RGMII_RX_CLK_SEL |
+ DP83TG720S_RGMII_TX_CLK_SEL;
+
+ return phy_modify_mmd(phydev, MDIO_MMD_VEND2,
+ DP83TG720S_RGMII_DELAY_CTRL, rgmii_delay_mask,
+ rgmii_delay);
+}
+
+static int dp83tg720_config_init(struct phy_device *phydev)
+{
+ int ret;
+
+ /* Software Restart is not enough to recover from a link failure.
+ * Using Hardware Reset instead.
+ */
+ ret = phy_write(phydev, DP83TG720S_PHY_RESET, DP83TG720S_HW_RESET);
+ if (ret)
+ return ret;
+
+ /* Wait until MDC can be used again.
+ * The wait value of one 1ms is documented in "DP83TG720S-Q1 1000BASE-T1
+ * Automotive Ethernet PHY with SGMII and RGMII" datasheet.
+ */
+ usleep_range(1000, 2000);
+
+ if (phy_interface_is_rgmii(phydev))
+ return dp83tg720_config_rgmii_delay(phydev);
+
+ return 0;
+}
+
+static struct phy_driver dp83tg720_driver[] = {
+{
+ PHY_ID_MATCH_MODEL(DP83TG720S_PHY_ID),
+ .name = "TI DP83TG720S",
+
+ .config_aneg = dp83tg720_config_aneg,
+ .read_status = dp83tg720_read_status,
+ .get_features = genphy_c45_pma_read_ext_abilities,
+ .config_init = dp83tg720_config_init,
+ .get_sqi = dp83tg720_get_sqi,
+ .get_sqi_max = dp83tg720_get_sqi_max,
+
+ .suspend = genphy_suspend,
+ .resume = genphy_resume,
+} };
+module_phy_driver(dp83tg720_driver);
+
+static struct mdio_device_id __maybe_unused dp83tg720_tbl[] = {
+ { PHY_ID_MATCH_MODEL(DP83TG720S_PHY_ID) },
+ { }
+};
+MODULE_DEVICE_TABLE(mdio, dp83tg720_tbl);
+
+MODULE_DESCRIPTION("Texas Instruments DP83TG720S PHY driver");
+MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");