tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for the Texas Instruments DP83848 PHY
3 *
4 * Copyright (C) 2015 Texas Instruments Inc.
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 DP83848_PHY_ID 0x20005c90
20
21/* Registers */
22#define DP83848_MICR 0x11
23#define DP83848_MISR 0x12
24
25/* MICR Register Fields */
26#define DP83848_MICR_INT_OE BIT(0) /* Interrupt Output Enable */
27#define DP83848_MICR_INTEN BIT(1) /* Interrupt Enable */
28
29/* MISR Register Fields */
30#define DP83848_MISR_RHF_INT_EN BIT(0) /* Receive Error Counter */
31#define DP83848_MISR_FHF_INT_EN BIT(1) /* False Carrier Counter */
32#define DP83848_MISR_ANC_INT_EN BIT(2) /* Auto-negotiation complete */
33#define DP83848_MISR_DUP_INT_EN BIT(3) /* Duplex Status */
34#define DP83848_MISR_SPD_INT_EN BIT(4) /* Speed status */
35#define DP83848_MISR_LINK_INT_EN BIT(5) /* Link status */
36#define DP83848_MISR_ED_INT_EN BIT(6) /* Energy detect */
37#define DP83848_MISR_LQM_INT_EN BIT(7) /* Link Quality Monitor */
38
39static int dp83848_ack_interrupt(struct phy_device *phydev)
40{
41 int err = phy_read(phydev, DP83848_MISR);
42
43 return err < 0 ? err : 0;
44}
45
46static int dp83848_config_intr(struct phy_device *phydev)
47{
48 int err;
49
50 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
51 err = phy_write(phydev, DP83848_MICR,
52 DP83848_MICR_INT_OE |
53 DP83848_MICR_INTEN);
54 if (err < 0)
55 return err;
56
57 return phy_write(phydev, DP83848_MISR,
58 DP83848_MISR_ANC_INT_EN |
59 DP83848_MISR_DUP_INT_EN |
60 DP83848_MISR_SPD_INT_EN |
61 DP83848_MISR_LINK_INT_EN);
62 }
63
64 return phy_write(phydev, DP83848_MICR, 0x0);
65}
66
67static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
68 { DP83848_PHY_ID, 0xfffffff0 },
69 { }
70};
71MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
72
73static struct phy_driver dp83848_driver[] = {
74 {
75 .phy_id = DP83848_PHY_ID,
76 .phy_id_mask = 0xfffffff0,
77 .name = "TI DP83848",
78 .features = PHY_BASIC_FEATURES,
79 .flags = PHY_HAS_INTERRUPT,
80
81 .soft_reset = genphy_soft_reset,
82 .config_init = genphy_config_init,
83 .suspend = genphy_suspend,
84 .resume = genphy_resume,
85 .config_aneg = genphy_config_aneg,
86 .read_status = genphy_read_status,
87
88 /* IRQ related */
89 .ack_interrupt = dp83848_ack_interrupt,
90 .config_intr = dp83848_config_intr,
91 },
92};
93module_phy_driver(dp83848_driver);
94
95MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
96MODULE_AUTHOR("Andrew F. Davis <afd@ti.com");
97MODULE_LICENSE("GPL");