xref: /openbmc/linux/drivers/net/phy/dp83848.c (revision 4f205687)
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 NS_DP83848C_PHY_ID		0x20005c90
21 #define TLK10X_PHY_ID			0x2000a210
22 
23 /* Registers */
24 #define DP83848_MICR			0x11 /* MII Interrupt Control Register */
25 #define DP83848_MISR			0x12 /* MII Interrupt Status Register */
26 
27 /* MICR Register Fields */
28 #define DP83848_MICR_INT_OE		BIT(0) /* Interrupt Output Enable */
29 #define DP83848_MICR_INTEN		BIT(1) /* Interrupt Enable */
30 
31 /* MISR Register Fields */
32 #define DP83848_MISR_RHF_INT_EN		BIT(0) /* Receive Error Counter */
33 #define DP83848_MISR_FHF_INT_EN		BIT(1) /* False Carrier Counter */
34 #define DP83848_MISR_ANC_INT_EN		BIT(2) /* Auto-negotiation complete */
35 #define DP83848_MISR_DUP_INT_EN		BIT(3) /* Duplex Status */
36 #define DP83848_MISR_SPD_INT_EN		BIT(4) /* Speed status */
37 #define DP83848_MISR_LINK_INT_EN	BIT(5) /* Link status */
38 #define DP83848_MISR_ED_INT_EN		BIT(6) /* Energy detect */
39 #define DP83848_MISR_LQM_INT_EN		BIT(7) /* Link Quality Monitor */
40 
41 #define DP83848_INT_EN_MASK		\
42 	(DP83848_MISR_ANC_INT_EN |	\
43 	 DP83848_MISR_DUP_INT_EN |	\
44 	 DP83848_MISR_SPD_INT_EN |	\
45 	 DP83848_MISR_LINK_INT_EN)
46 
47 static int dp83848_ack_interrupt(struct phy_device *phydev)
48 {
49 	int err = phy_read(phydev, DP83848_MISR);
50 
51 	return err < 0 ? err : 0;
52 }
53 
54 static int dp83848_config_intr(struct phy_device *phydev)
55 {
56 	int control, ret;
57 
58 	control = phy_read(phydev, DP83848_MICR);
59 	if (control < 0)
60 		return control;
61 
62 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
63 		control |= DP83848_MICR_INT_OE;
64 		control |= DP83848_MICR_INTEN;
65 
66 		ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
67 		if (ret < 0)
68 			return ret;
69 	} else {
70 		control &= ~DP83848_MICR_INTEN;
71 	}
72 
73 	return phy_write(phydev, DP83848_MICR, control);
74 }
75 
76 static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
77 	{ TI_DP83848C_PHY_ID, 0xfffffff0 },
78 	{ NS_DP83848C_PHY_ID, 0xfffffff0 },
79 	{ TLK10X_PHY_ID, 0xfffffff0 },
80 	{ }
81 };
82 MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
83 
84 #define DP83848_PHY_DRIVER(_id, _name)				\
85 	{							\
86 		.phy_id		= _id,				\
87 		.phy_id_mask	= 0xfffffff0,			\
88 		.name		= _name,			\
89 		.features	= PHY_BASIC_FEATURES,		\
90 		.flags		= PHY_HAS_INTERRUPT,		\
91 								\
92 		.soft_reset	= genphy_soft_reset,		\
93 		.config_init	= genphy_config_init,		\
94 		.suspend	= genphy_suspend,		\
95 		.resume		= genphy_resume,		\
96 		.config_aneg	= genphy_config_aneg,		\
97 		.read_status	= genphy_read_status,		\
98 								\
99 		/* IRQ related */				\
100 		.ack_interrupt	= dp83848_ack_interrupt,	\
101 		.config_intr	= dp83848_config_intr,		\
102 	}
103 
104 static struct phy_driver dp83848_driver[] = {
105 	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY"),
106 	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY"),
107 	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY"),
108 };
109 module_phy_driver(dp83848_driver);
110 
111 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
112 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com");
113 MODULE_LICENSE("GPL");
114