1 // SPDX-License-Identifier: GPL-2.0
2 /* Driver for the Texas Instruments DP83TD510 PHY
3 * Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
6 #include <linux/bitfield.h>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
11 #define DP83TD510E_PHY_ID 0x20000181
13 /* MDIO_MMD_VEND2 registers */
14 #define DP83TD510E_PHY_STS 0x10
15 #define DP83TD510E_STS_MII_INT BIT(7)
16 #define DP83TD510E_LINK_STATUS BIT(0)
18 #define DP83TD510E_GEN_CFG 0x11
19 #define DP83TD510E_GENCFG_INT_POLARITY BIT(3)
20 #define DP83TD510E_GENCFG_INT_EN BIT(1)
21 #define DP83TD510E_GENCFG_INT_OE BIT(0)
23 #define DP83TD510E_INTERRUPT_REG_1 0x12
24 #define DP83TD510E_INT1_LINK BIT(13)
25 #define DP83TD510E_INT1_LINK_EN BIT(5)
27 #define DP83TD510E_AN_STAT_1 0x60c
28 #define DP83TD510E_MASTER_SLAVE_RESOL_FAIL BIT(15)
30 static int dp83td510_config_intr(struct phy_device *phydev)
34 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
35 /* Clear any pending interrupts */
36 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PHY_STS,
41 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
42 DP83TD510E_INTERRUPT_REG_1,
43 DP83TD510E_INT1_LINK_EN);
47 ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND2,
49 DP83TD510E_GENCFG_INT_POLARITY |
50 DP83TD510E_GENCFG_INT_EN |
51 DP83TD510E_GENCFG_INT_OE);
53 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
54 DP83TD510E_INTERRUPT_REG_1, 0x0);
58 ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
60 DP83TD510E_GENCFG_INT_EN);
64 /* Clear any pending interrupts */
65 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PHY_STS,
72 static irqreturn_t dp83td510_handle_interrupt(struct phy_device *phydev)
76 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PHY_STS);
80 } else if (!(ret & DP83TD510E_STS_MII_INT)) {
84 /* Read the current enabled interrupts */
85 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_INTERRUPT_REG_1);
89 } else if (!(ret & DP83TD510E_INT1_LINK_EN) ||
90 !(ret & DP83TD510E_INT1_LINK)) {
94 phy_trigger_machine(phydev);
99 static int dp83td510_read_status(struct phy_device *phydev)
104 phydev->speed = SPEED_UNKNOWN;
105 phydev->duplex = DUPLEX_UNKNOWN;
107 phydev->asym_pause = 0;
108 linkmode_zero(phydev->lp_advertising);
110 phy_sts = phy_read(phydev, DP83TD510E_PHY_STS);
112 phydev->link = !!(phy_sts & DP83TD510E_LINK_STATUS);
114 /* This PHY supports only one link mode: 10BaseT1L_Full */
115 phydev->duplex = DUPLEX_FULL;
116 phydev->speed = SPEED_10;
118 if (phydev->autoneg == AUTONEG_ENABLE) {
119 ret = genphy_c45_read_lpa(phydev);
123 phy_resolve_aneg_linkmode(phydev);
127 if (phydev->autoneg == AUTONEG_ENABLE) {
128 ret = genphy_c45_baset1_read_status(phydev);
132 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2,
133 DP83TD510E_AN_STAT_1);
137 if (ret & DP83TD510E_MASTER_SLAVE_RESOL_FAIL)
138 phydev->master_slave_state = MASTER_SLAVE_STATE_ERR;
140 return genphy_c45_pma_baset1_read_master_slave(phydev);
146 static int dp83td510_config_aneg(struct phy_device *phydev)
148 bool changed = false;
151 ret = genphy_c45_pma_baset1_setup_master_slave(phydev);
155 if (phydev->autoneg == AUTONEG_DISABLE)
156 return genphy_c45_an_disable_aneg(phydev);
158 ret = genphy_c45_an_config_aneg(phydev);
164 return genphy_c45_check_and_restart_aneg(phydev, changed);
167 static int dp83td510_get_features(struct phy_device *phydev)
169 /* This PHY can't respond on MDIO bus if no RMII clock is enabled.
170 * In case RMII mode is used (most meaningful mode for this PHY) and
171 * the PHY do not have own XTAL, and CLK providing MAC is not probed,
172 * we won't be able to read all needed ability registers.
173 * So provide it manually.
176 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
177 linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
178 linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
179 linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
185 static struct phy_driver dp83td510_driver[] = {
187 PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID),
188 .name = "TI DP83TD510E",
190 .config_aneg = dp83td510_config_aneg,
191 .read_status = dp83td510_read_status,
192 .get_features = dp83td510_get_features,
193 .config_intr = dp83td510_config_intr,
194 .handle_interrupt = dp83td510_handle_interrupt,
196 .suspend = genphy_suspend,
197 .resume = genphy_resume,
199 module_phy_driver(dp83td510_driver);
201 static struct mdio_device_id __maybe_unused dp83td510_tbl[] = {
202 { PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID) },
205 MODULE_DEVICE_TABLE(mdio, dp83td510_tbl);
207 MODULE_DESCRIPTION("Texas Instruments DP83TD510E PHY driver");
208 MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
209 MODULE_LICENSE("GPL v2");