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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for the Texas Instruments DP83848 PHY
4 *
5 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
6 */
7
8#include <linux/module.h>
9#include <linux/phy.h>
10
11#define TI_DP83848C_PHY_ID 0x20005ca0
12#define TI_DP83620_PHY_ID 0x20005ce0
13#define NS_DP83848C_PHY_ID 0x20005c90
14#define TLK10X_PHY_ID 0x2000a210
15
16/* Registers */
17#define DP83848_MICR 0x11 /* MII Interrupt Control Register */
18#define DP83848_MISR 0x12 /* MII Interrupt Status Register */
19
20/* MICR Register Fields */
21#define DP83848_MICR_INT_OE BIT(0) /* Interrupt Output Enable */
22#define DP83848_MICR_INTEN BIT(1) /* Interrupt Enable */
23
24/* MISR Register Fields */
25#define DP83848_MISR_RHF_INT_EN BIT(0) /* Receive Error Counter */
26#define DP83848_MISR_FHF_INT_EN BIT(1) /* False Carrier Counter */
27#define DP83848_MISR_ANC_INT_EN BIT(2) /* Auto-negotiation complete */
28#define DP83848_MISR_DUP_INT_EN BIT(3) /* Duplex Status */
29#define DP83848_MISR_SPD_INT_EN BIT(4) /* Speed status */
30#define DP83848_MISR_LINK_INT_EN BIT(5) /* Link status */
31#define DP83848_MISR_ED_INT_EN BIT(6) /* Energy detect */
32#define DP83848_MISR_LQM_INT_EN BIT(7) /* Link Quality Monitor */
33
34#define DP83848_INT_EN_MASK \
35 (DP83848_MISR_ANC_INT_EN | \
36 DP83848_MISR_DUP_INT_EN | \
37 DP83848_MISR_SPD_INT_EN | \
38 DP83848_MISR_LINK_INT_EN)
39
40static int dp83848_ack_interrupt(struct phy_device *phydev)
41{
42 int err = phy_read(phydev, DP83848_MISR);
43
44 return err < 0 ? err : 0;
45}
46
47static int dp83848_config_intr(struct phy_device *phydev)
48{
49 int control, ret;
50
51 control = phy_read(phydev, DP83848_MICR);
52 if (control < 0)
53 return control;
54
55 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
56 control |= DP83848_MICR_INT_OE;
57 control |= DP83848_MICR_INTEN;
58
59 ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
60 if (ret < 0)
61 return ret;
62 } else {
63 control &= ~DP83848_MICR_INTEN;
64 }
65
66 return phy_write(phydev, DP83848_MICR, control);
67}
68
69static int dp83848_config_init(struct phy_device *phydev)
70{
71 int err;
72 int val;
73
74 err = genphy_config_init(phydev);
75 if (err < 0)
76 return err;
77
78 /* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,
79 * we check initial value of BMCR Auto negotiation enable bit
80 */
81 val = phy_read(phydev, MII_BMCR);
82 if (!(val & BMCR_ANENABLE))
83 phydev->autoneg = AUTONEG_DISABLE;
84
85 return 0;
86}
87
88static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
89 { TI_DP83848C_PHY_ID, 0xfffffff0 },
90 { NS_DP83848C_PHY_ID, 0xfffffff0 },
91 { TI_DP83620_PHY_ID, 0xfffffff0 },
92 { TLK10X_PHY_ID, 0xfffffff0 },
93 { }
94};
95MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
96
97#define DP83848_PHY_DRIVER(_id, _name, _config_init) \
98 { \
99 .phy_id = _id, \
100 .phy_id_mask = 0xfffffff0, \
101 .name = _name, \
102 .features = PHY_BASIC_FEATURES, \
103 \
104 .soft_reset = genphy_soft_reset, \
105 .config_init = _config_init, \
106 .suspend = genphy_suspend, \
107 .resume = genphy_resume, \
108 \
109 /* IRQ related */ \
110 .ack_interrupt = dp83848_ack_interrupt, \
111 .config_intr = dp83848_config_intr, \
112 }
113
114static struct phy_driver dp83848_driver[] = {
115 DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",
116 genphy_config_init),
117 DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",
118 genphy_config_init),
119 DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",
120 dp83848_config_init),
121 DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",
122 genphy_config_init),
123};
124module_phy_driver(dp83848_driver);
125
126MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
127MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
128MODULE_LICENSE("GPL v2");