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