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 /* Bit 7 - mii_interrupt, active high. Clears on read.
16 * Note: Clearing does not necessarily deactivate IRQ pin if interrupts pending.
17 * This differs from the DP83TD510E datasheet (2020) which states this bit
20 #define DP83TD510E_STS_MII_INT BIT(7)
21 #define DP83TD510E_LINK_STATUS BIT(0)
23 #define DP83TD510E_GEN_CFG 0x11
24 #define DP83TD510E_GENCFG_INT_POLARITY BIT(3)
25 #define DP83TD510E_GENCFG_INT_EN BIT(1)
26 #define DP83TD510E_GENCFG_INT_OE BIT(0)
28 #define DP83TD510E_INTERRUPT_REG_1 0x12
29 #define DP83TD510E_INT1_LINK BIT(13)
30 #define DP83TD510E_INT1_LINK_EN BIT(5)
32 #define DP83TD510E_AN_STAT_1 0x60c
33 #define DP83TD510E_MASTER_SLAVE_RESOL_FAIL BIT(15)
35 #define DP83TD510E_MSE_DETECT 0xa85
37 #define DP83TD510_SQI_MAX 7
39 /* Register values are converted to SNR(dB) as suggested by
40 * "Application Report - DP83TD510E Cable Diagnostics Toolkit":
41 * SNR(dB) = -10 * log10 (VAL/2^17) - 1.76 dB.
42 * SQI ranges are implemented according to "OPEN ALLIANCE - Advanced diagnostic
43 * features for 100BASE-T1 automotive Ethernet PHYs"
45 static const u16 dp83td510_mse_sqi_map[] = {
47 0x044c, /* 18dB =< SNR < 19dB */
48 0x0369, /* 19dB =< SNR < 20dB */
49 0x02b6, /* 20dB =< SNR < 21dB */
50 0x0227, /* 21dB =< SNR < 22dB */
51 0x01b6, /* 22dB =< SNR < 23dB */
52 0x015b, /* 23dB =< SNR < 24dB */
53 0x0000 /* 24dB =< SNR */
56 static int dp83td510_config_intr(struct phy_device *phydev)
60 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
61 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
62 DP83TD510E_INTERRUPT_REG_1,
63 DP83TD510E_INT1_LINK_EN);
67 ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND2,
69 DP83TD510E_GENCFG_INT_POLARITY |
70 DP83TD510E_GENCFG_INT_EN |
71 DP83TD510E_GENCFG_INT_OE);
73 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
74 DP83TD510E_INTERRUPT_REG_1, 0x0);
78 ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
80 DP83TD510E_GENCFG_INT_EN);
88 static irqreturn_t dp83td510_handle_interrupt(struct phy_device *phydev)
92 /* Read the current enabled interrupts */
93 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_INTERRUPT_REG_1);
97 } else if (!(ret & DP83TD510E_INT1_LINK_EN) ||
98 !(ret & DP83TD510E_INT1_LINK)) {
102 phy_trigger_machine(phydev);
107 static int dp83td510_read_status(struct phy_device *phydev)
112 phydev->speed = SPEED_UNKNOWN;
113 phydev->duplex = DUPLEX_UNKNOWN;
115 phydev->asym_pause = 0;
116 linkmode_zero(phydev->lp_advertising);
118 phy_sts = phy_read(phydev, DP83TD510E_PHY_STS);
120 phydev->link = !!(phy_sts & DP83TD510E_LINK_STATUS);
122 /* This PHY supports only one link mode: 10BaseT1L_Full */
123 phydev->duplex = DUPLEX_FULL;
124 phydev->speed = SPEED_10;
126 if (phydev->autoneg == AUTONEG_ENABLE) {
127 ret = genphy_c45_read_lpa(phydev);
131 phy_resolve_aneg_linkmode(phydev);
135 if (phydev->autoneg == AUTONEG_ENABLE) {
136 ret = genphy_c45_baset1_read_status(phydev);
140 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2,
141 DP83TD510E_AN_STAT_1);
145 if (ret & DP83TD510E_MASTER_SLAVE_RESOL_FAIL)
146 phydev->master_slave_state = MASTER_SLAVE_STATE_ERR;
148 return genphy_c45_pma_baset1_read_master_slave(phydev);
154 static int dp83td510_config_aneg(struct phy_device *phydev)
156 bool changed = false;
159 ret = genphy_c45_pma_baset1_setup_master_slave(phydev);
163 if (phydev->autoneg == AUTONEG_DISABLE)
164 return genphy_c45_an_disable_aneg(phydev);
166 ret = genphy_c45_an_config_aneg(phydev);
172 return genphy_c45_check_and_restart_aneg(phydev, changed);
175 static int dp83td510_get_sqi(struct phy_device *phydev)
183 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_MSE_DETECT);
187 mse_val = 0xFFFF & ret;
188 for (sqi = 0; sqi < ARRAY_SIZE(dp83td510_mse_sqi_map); sqi++) {
189 if (mse_val >= dp83td510_mse_sqi_map[sqi])
196 static int dp83td510_get_sqi_max(struct phy_device *phydev)
198 return DP83TD510_SQI_MAX;
201 static int dp83td510_get_features(struct phy_device *phydev)
203 /* This PHY can't respond on MDIO bus if no RMII clock is enabled.
204 * In case RMII mode is used (most meaningful mode for this PHY) and
205 * the PHY do not have own XTAL, and CLK providing MAC is not probed,
206 * we won't be able to read all needed ability registers.
207 * So provide it manually.
210 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
211 linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
212 linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
213 linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
219 static struct phy_driver dp83td510_driver[] = {
221 PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID),
222 .name = "TI DP83TD510E",
224 .config_aneg = dp83td510_config_aneg,
225 .read_status = dp83td510_read_status,
226 .get_features = dp83td510_get_features,
227 .config_intr = dp83td510_config_intr,
228 .handle_interrupt = dp83td510_handle_interrupt,
229 .get_sqi = dp83td510_get_sqi,
230 .get_sqi_max = dp83td510_get_sqi_max,
232 .suspend = genphy_suspend,
233 .resume = genphy_resume,
235 module_phy_driver(dp83td510_driver);
237 static struct mdio_device_id __maybe_unused dp83td510_tbl[] = {
238 { PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID) },
241 MODULE_DEVICE_TABLE(mdio, dp83td510_tbl);
243 MODULE_DESCRIPTION("Texas Instruments DP83TD510E PHY driver");
244 MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
245 MODULE_LICENSE("GPL v2");