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
40 #define DP83848_MISR_RHF_INT BIT(8)
41 #define DP83848_MISR_FHF_INT BIT(9)
42 #define DP83848_MISR_ANC_INT BIT(10)
43 #define DP83848_MISR_DUP_INT BIT(11)
44 #define DP83848_MISR_SPD_INT BIT(12)
45 #define DP83848_MISR_LINK_INT BIT(13)
46 #define DP83848_MISR_ED_INT BIT(14)
47
48 #define DP83848_INT_MASK \
49 (DP83848_MISR_ANC_INT | \
50 DP83848_MISR_DUP_INT | \
51 DP83848_MISR_SPD_INT | \
52 DP83848_MISR_LINK_INT)
53
dp83848_ack_interrupt(struct phy_device * phydev)54 static int dp83848_ack_interrupt(struct phy_device *phydev)
55 {
56 int err = phy_read(phydev, DP83848_MISR);
57
58 return err < 0 ? err : 0;
59 }
60
dp83848_config_intr(struct phy_device * phydev)61 static int dp83848_config_intr(struct phy_device *phydev)
62 {
63 int control, ret;
64
65 control = phy_read(phydev, DP83848_MICR);
66 if (control < 0)
67 return control;
68
69 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
70 ret = dp83848_ack_interrupt(phydev);
71 if (ret)
72 return ret;
73
74 control |= DP83848_MICR_INT_OE;
75 control |= DP83848_MICR_INTEN;
76
77 ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
78 if (ret < 0)
79 return ret;
80
81 ret = phy_write(phydev, DP83848_MICR, control);
82 } else {
83 control &= ~DP83848_MICR_INTEN;
84 ret = phy_write(phydev, DP83848_MICR, control);
85 if (ret)
86 return ret;
87
88 ret = dp83848_ack_interrupt(phydev);
89 }
90
91 return ret;
92 }
93
dp83848_handle_interrupt(struct phy_device * phydev)94 static irqreturn_t dp83848_handle_interrupt(struct phy_device *phydev)
95 {
96 int irq_status;
97
98 irq_status = phy_read(phydev, DP83848_MISR);
99 if (irq_status < 0) {
100 phy_error(phydev);
101 return IRQ_NONE;
102 }
103
104 if (!(irq_status & DP83848_INT_MASK))
105 return IRQ_NONE;
106
107 phy_trigger_machine(phydev);
108
109 return IRQ_HANDLED;
110 }
111
dp83848_config_init(struct phy_device * phydev)112 static int dp83848_config_init(struct phy_device *phydev)
113 {
114 int val;
115
116 /* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,
117 * we check initial value of BMCR Auto negotiation enable bit
118 */
119 val = phy_read(phydev, MII_BMCR);
120 if (!(val & BMCR_ANENABLE))
121 phydev->autoneg = AUTONEG_DISABLE;
122
123 return 0;
124 }
125
126 static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
127 { TI_DP83848C_PHY_ID, 0xfffffff0 },
128 { NS_DP83848C_PHY_ID, 0xfffffff0 },
129 { TI_DP83620_PHY_ID, 0xfffffff0 },
130 { TLK10X_PHY_ID, 0xfffffff0 },
131 { }
132 };
133 MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
134
135 #define DP83848_PHY_DRIVER(_id, _name, _config_init) \
136 { \
137 .phy_id = _id, \
138 .phy_id_mask = 0xfffffff0, \
139 .name = _name, \
140 /* PHY_BASIC_FEATURES */ \
141 \
142 .soft_reset = genphy_soft_reset, \
143 .config_init = _config_init, \
144 .suspend = genphy_suspend, \
145 .resume = genphy_resume, \
146 \
147 /* IRQ related */ \
148 .config_intr = dp83848_config_intr, \
149 .handle_interrupt = dp83848_handle_interrupt, \
150 }
151
152 static struct phy_driver dp83848_driver[] = {
153 DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",
154 NULL),
155 DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",
156 NULL),
157 DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",
158 dp83848_config_init),
159 DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",
160 NULL),
161 };
162 module_phy_driver(dp83848_driver);
163
164 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
165 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
166 MODULE_LICENSE("GPL v2");
167
