GNU Linux-libre 4.19.314-gnu1
[releases.git] / drivers / net / phy / dp83848.c
1 /*
2  * Driver for the Texas Instruments DP83848 PHY
3  *
4  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  */
15
16 #include <linux/module.h>
17 #include <linux/phy.h>
18
19 #define TI_DP83848C_PHY_ID              0x20005ca0
20 #define TI_DP83620_PHY_ID               0x20005ce0
21 #define NS_DP83848C_PHY_ID              0x20005c90
22 #define TLK10X_PHY_ID                   0x2000a210
23
24 /* Registers */
25 #define DP83848_MICR                    0x11 /* MII Interrupt Control Register */
26 #define DP83848_MISR                    0x12 /* MII Interrupt Status Register */
27
28 /* MICR Register Fields */
29 #define DP83848_MICR_INT_OE             BIT(0) /* Interrupt Output Enable */
30 #define DP83848_MICR_INTEN              BIT(1) /* Interrupt Enable */
31
32 /* MISR Register Fields */
33 #define DP83848_MISR_RHF_INT_EN         BIT(0) /* Receive Error Counter */
34 #define DP83848_MISR_FHF_INT_EN         BIT(1) /* False Carrier Counter */
35 #define DP83848_MISR_ANC_INT_EN         BIT(2) /* Auto-negotiation complete */
36 #define DP83848_MISR_DUP_INT_EN         BIT(3) /* Duplex Status */
37 #define DP83848_MISR_SPD_INT_EN         BIT(4) /* Speed status */
38 #define DP83848_MISR_LINK_INT_EN        BIT(5) /* Link status */
39 #define DP83848_MISR_ED_INT_EN          BIT(6) /* Energy detect */
40 #define DP83848_MISR_LQM_INT_EN         BIT(7) /* Link Quality Monitor */
41
42 #define DP83848_INT_EN_MASK             \
43         (DP83848_MISR_ANC_INT_EN |      \
44          DP83848_MISR_DUP_INT_EN |      \
45          DP83848_MISR_SPD_INT_EN |      \
46          DP83848_MISR_LINK_INT_EN)
47
48 static int dp83848_ack_interrupt(struct phy_device *phydev)
49 {
50         int err = phy_read(phydev, DP83848_MISR);
51
52         return err < 0 ? err : 0;
53 }
54
55 static int dp83848_config_intr(struct phy_device *phydev)
56 {
57         int control, ret;
58
59         control = phy_read(phydev, DP83848_MICR);
60         if (control < 0)
61                 return control;
62
63         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
64                 control |= DP83848_MICR_INT_OE;
65                 control |= DP83848_MICR_INTEN;
66
67                 ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
68                 if (ret < 0)
69                         return ret;
70         } else {
71                 control &= ~DP83848_MICR_INTEN;
72         }
73
74         return phy_write(phydev, DP83848_MICR, control);
75 }
76
77 static int dp83848_config_init(struct phy_device *phydev)
78 {
79         int err;
80         int val;
81
82         err = genphy_config_init(phydev);
83         if (err < 0)
84                 return err;
85
86         /* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,
87          * we check initial value of BMCR Auto negotiation enable bit
88          */
89         val = phy_read(phydev, MII_BMCR);
90         if (!(val & BMCR_ANENABLE))
91                 phydev->autoneg = AUTONEG_DISABLE;
92
93         return 0;
94 }
95
96 static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
97         { TI_DP83848C_PHY_ID, 0xfffffff0 },
98         { NS_DP83848C_PHY_ID, 0xfffffff0 },
99         { TI_DP83620_PHY_ID, 0xfffffff0 },
100         { TLK10X_PHY_ID, 0xfffffff0 },
101         { }
102 };
103 MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
104
105 #define DP83848_PHY_DRIVER(_id, _name, _config_init)            \
106         {                                                       \
107                 .phy_id         = _id,                          \
108                 .phy_id_mask    = 0xfffffff0,                   \
109                 .name           = _name,                        \
110                 .features       = PHY_BASIC_FEATURES,           \
111                 .flags          = PHY_HAS_INTERRUPT,            \
112                                                                 \
113                 .soft_reset     = genphy_soft_reset,            \
114                 .config_init    = _config_init,                 \
115                 .suspend        = genphy_suspend,               \
116                 .resume         = genphy_resume,                \
117                                                                 \
118                 /* IRQ related */                               \
119                 .ack_interrupt  = dp83848_ack_interrupt,        \
120                 .config_intr    = dp83848_config_intr,          \
121         }
122
123 static struct phy_driver dp83848_driver[] = {
124         DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",
125                            genphy_config_init),
126         DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",
127                            genphy_config_init),
128         DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",
129                            dp83848_config_init),
130         DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",
131                            genphy_config_init),
132 };
133 module_phy_driver(dp83848_driver);
134
135 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
136 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
137 MODULE_LICENSE("GPL");