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 | |
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 | |
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, val: control); |
82 | } else { |
83 | control &= ~DP83848_MICR_INTEN; |
84 | ret = phy_write(phydev, DP83848_MICR, val: control); |
85 | if (ret) |
86 | return ret; |
87 | |
88 | ret = dp83848_ack_interrupt(phydev); |
89 | } |
90 | |
91 | return ret; |
92 | } |
93 | |
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 | |
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 | |