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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>
4 */
5
6#include <linux/bitfield.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/phy.h>
10
11#define DP83TD510E_PHY_ID 0x20000181
12
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
18 * clears on write 0.
19 */
20#define DP83TD510E_STS_MII_INT BIT(7)
21#define DP83TD510E_LINK_STATUS BIT(0)
22
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)
27
28#define DP83TD510E_INTERRUPT_REG_1 0x12
29#define DP83TD510E_INT1_LINK BIT(13)
30#define DP83TD510E_INT1_LINK_EN BIT(5)
31
32#define DP83TD510E_AN_STAT_1 0x60c
33#define DP83TD510E_MASTER_SLAVE_RESOL_FAIL BIT(15)
34
35#define DP83TD510E_MSE_DETECT 0xa85
36
37#define DP83TD510_SQI_MAX 7
38
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"
44 */
45static const u16 dp83td510_mse_sqi_map[] = {
46 0x0569, /* < 18dB */
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 */
54};
55
56static int dp83td510_config_intr(struct phy_device *phydev)
57{
58 int ret;
59
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);
64 if (ret)
65 return ret;
66
67 ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND2,
68 DP83TD510E_GEN_CFG,
69 DP83TD510E_GENCFG_INT_POLARITY |
70 DP83TD510E_GENCFG_INT_EN |
71 DP83TD510E_GENCFG_INT_OE);
72 } else {
73 ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
74 DP83TD510E_INTERRUPT_REG_1, 0x0);
75 if (ret)
76 return ret;
77
78 ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
79 DP83TD510E_GEN_CFG,
80 DP83TD510E_GENCFG_INT_EN);
81 if (ret)
82 return ret;
83 }
84
85 return ret;
86}
87
88static irqreturn_t dp83td510_handle_interrupt(struct phy_device *phydev)
89{
90 int ret;
91
92 /* Read the current enabled interrupts */
93 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_INTERRUPT_REG_1);
94 if (ret < 0) {
95 phy_error(phydev);
96 return IRQ_NONE;
97 } else if (!(ret & DP83TD510E_INT1_LINK_EN) ||
98 !(ret & DP83TD510E_INT1_LINK)) {
99 return IRQ_NONE;
100 }
101
102 phy_trigger_machine(phydev);
103
104 return IRQ_HANDLED;
105}
106
107static int dp83td510_read_status(struct phy_device *phydev)
108{
109 u16 phy_sts;
110 int ret;
111
112 phydev->speed = SPEED_UNKNOWN;
113 phydev->duplex = DUPLEX_UNKNOWN;
114 phydev->pause = 0;
115 phydev->asym_pause = 0;
116 linkmode_zero(phydev->lp_advertising);
117
118 phy_sts = phy_read(phydev, DP83TD510E_PHY_STS);
119
120 phydev->link = !!(phy_sts & DP83TD510E_LINK_STATUS);
121 if (phydev->link) {
122 /* This PHY supports only one link mode: 10BaseT1L_Full */
123 phydev->duplex = DUPLEX_FULL;
124 phydev->speed = SPEED_10;
125
126 if (phydev->autoneg == AUTONEG_ENABLE) {
127 ret = genphy_c45_read_lpa(phydev);
128 if (ret)
129 return ret;
130
131 phy_resolve_aneg_linkmode(phydev);
132 }
133 }
134
135 if (phydev->autoneg == AUTONEG_ENABLE) {
136 ret = genphy_c45_baset1_read_status(phydev);
137 if (ret < 0)
138 return ret;
139
140 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2,
141 DP83TD510E_AN_STAT_1);
142 if (ret < 0)
143 return ret;
144
145 if (ret & DP83TD510E_MASTER_SLAVE_RESOL_FAIL)
146 phydev->master_slave_state = MASTER_SLAVE_STATE_ERR;
147 } else {
148 return genphy_c45_pma_baset1_read_master_slave(phydev);
149 }
150
151 return 0;
152}
153
154static int dp83td510_config_aneg(struct phy_device *phydev)
155{
156 bool changed = false;
157 int ret;
158
159 ret = genphy_c45_pma_baset1_setup_master_slave(phydev);
160 if (ret < 0)
161 return ret;
162
163 if (phydev->autoneg == AUTONEG_DISABLE)
164 return genphy_c45_an_disable_aneg(phydev);
165
166 ret = genphy_c45_an_config_aneg(phydev);
167 if (ret < 0)
168 return ret;
169 if (ret > 0)
170 changed = true;
171
172 return genphy_c45_check_and_restart_aneg(phydev, changed);
173}
174
175static int dp83td510_get_sqi(struct phy_device *phydev)
176{
177 int sqi, ret;
178 u16 mse_val;
179
180 if (!phydev->link)
181 return 0;
182
183 ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_MSE_DETECT);
184 if (ret < 0)
185 return ret;
186
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])
190 return sqi;
191 }
192
193 return -EINVAL;
194}
195
196static int dp83td510_get_sqi_max(struct phy_device *phydev)
197{
198 return DP83TD510_SQI_MAX;
199}
200
201static int dp83td510_get_features(struct phy_device *phydev)
202{
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.
208 */
209
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,
214 phydev->supported);
215
216 return 0;
217}
218
219static struct phy_driver dp83td510_driver[] = {
220{
221 PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID),
222 .name = "TI DP83TD510E",
223
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,
231
232 .suspend = genphy_suspend,
233 .resume = genphy_resume,
234} };
235module_phy_driver(dp83td510_driver);
236
237static struct mdio_device_id __maybe_unused dp83td510_tbl[] = {
238 { PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID) },
239 { }
240};
241MODULE_DEVICE_TABLE(mdio, dp83td510_tbl);
242
243MODULE_DESCRIPTION("Texas Instruments DP83TD510E PHY driver");
244MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
245MODULE_LICENSE("GPL v2");