1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for the Renesas PHY uPD60620.
4 *
5 * Copyright (C) 2015 Softing Industrial Automation GmbH
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/phy.h>
11
12 #define UPD60620_PHY_ID 0xb8242824
13
14 /* Extended Registers and values */
15 /* PHY Special Control/Status */
16 #define PHY_PHYSCR 0x1F /* PHY.31 */
17 #define PHY_PHYSCR_10MB 0x0004 /* PHY speed = 10mb */
18 #define PHY_PHYSCR_100MB 0x0008 /* PHY speed = 100mb */
19 #define PHY_PHYSCR_DUPLEX 0x0010 /* PHY Duplex */
20
21 /* PHY Special Modes */
22 #define PHY_SPM 0x12 /* PHY.18 */
23
24 /* Init PHY */
25
upd60620_config_init(struct phy_device * phydev)26 static int upd60620_config_init(struct phy_device *phydev)
27 {
28 /* Enable support for passive HUBs (could be a strap option) */
29 /* PHYMODE: All speeds, HD in parallel detect */
30 return phy_write(phydev, PHY_SPM, 0x0180 | phydev->mdio.addr);
31 }
32
33 /* Get PHY status from common registers */
34
upd60620_read_status(struct phy_device * phydev)35 static int upd60620_read_status(struct phy_device *phydev)
36 {
37 int phy_state;
38
39 /* Read negotiated state */
40 phy_state = phy_read(phydev, MII_BMSR);
41 if (phy_state < 0)
42 return phy_state;
43
44 phydev->link = 0;
45 linkmode_zero(phydev->lp_advertising);
46 phydev->pause = 0;
47 phydev->asym_pause = 0;
48
49 if (phy_state & (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) {
50 phy_state = phy_read(phydev, PHY_PHYSCR);
51 if (phy_state < 0)
52 return phy_state;
53
54 if (phy_state & (PHY_PHYSCR_10MB | PHY_PHYSCR_100MB)) {
55 phydev->link = 1;
56 phydev->speed = SPEED_10;
57 phydev->duplex = DUPLEX_HALF;
58
59 if (phy_state & PHY_PHYSCR_100MB)
60 phydev->speed = SPEED_100;
61 if (phy_state & PHY_PHYSCR_DUPLEX)
62 phydev->duplex = DUPLEX_FULL;
63
64 phy_state = phy_read(phydev, MII_LPA);
65 if (phy_state < 0)
66 return phy_state;
67
68 mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising,
69 phy_state);
70
71 phy_resolve_aneg_pause(phydev);
72 }
73 }
74 return 0;
75 }
76
77 MODULE_DESCRIPTION("Renesas uPD60620 PHY driver");
78 MODULE_AUTHOR("Bernd Edlinger <bernd.edlinger@hotmail.de>");
79 MODULE_LICENSE("GPL");
80
81 static struct phy_driver upd60620_driver[1] = { {
82 .phy_id = UPD60620_PHY_ID,
83 .phy_id_mask = 0xfffffffe,
84 .name = "Renesas uPD60620",
85 /* PHY_BASIC_FEATURES */
86 .flags = 0,
87 .config_init = upd60620_config_init,
88 .read_status = upd60620_read_status,
89 } };
90
91 module_phy_driver(upd60620_driver);
92
93 static struct mdio_device_id __maybe_unused upd60620_tbl[] = {
94 { UPD60620_PHY_ID, 0xfffffffe },
95 { }
96 };
97
98 MODULE_DEVICE_TABLE(mdio, upd60620_tbl);
99