1 /* 2 * Driver for the Renesas PHY uPD60620. 3 * 4 * Copyright (C) 2015 Softing Industrial Automation GmbH 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, or 9 * (at your option) any later version. 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/phy.h> 16 17 #define UPD60620_PHY_ID 0xb8242824 18 19 /* Extended Registers and values */ 20 /* PHY Special Control/Status */ 21 #define PHY_PHYSCR 0x1F /* PHY.31 */ 22 #define PHY_PHYSCR_10MB 0x0004 /* PHY speed = 10mb */ 23 #define PHY_PHYSCR_100MB 0x0008 /* PHY speed = 100mb */ 24 #define PHY_PHYSCR_DUPLEX 0x0010 /* PHY Duplex */ 25 26 /* PHY Special Modes */ 27 #define PHY_SPM 0x12 /* PHY.18 */ 28 29 /* Init PHY */ 30 31 static int upd60620_config_init(struct phy_device *phydev) 32 { 33 /* Enable support for passive HUBs (could be a strap option) */ 34 /* PHYMODE: All speeds, HD in parallel detect */ 35 return phy_write(phydev, PHY_SPM, 0x0180 | phydev->mdio.addr); 36 } 37 38 /* Get PHY status from common registers */ 39 40 static int upd60620_read_status(struct phy_device *phydev) 41 { 42 int phy_state; 43 44 /* Read negotiated state */ 45 phy_state = phy_read(phydev, MII_BMSR); 46 if (phy_state < 0) 47 return phy_state; 48 49 phydev->link = 0; 50 linkmode_zero(phydev->lp_advertising); 51 phydev->pause = 0; 52 phydev->asym_pause = 0; 53 54 if (phy_state & (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) { 55 phy_state = phy_read(phydev, PHY_PHYSCR); 56 if (phy_state < 0) 57 return phy_state; 58 59 if (phy_state & (PHY_PHYSCR_10MB | PHY_PHYSCR_100MB)) { 60 phydev->link = 1; 61 phydev->speed = SPEED_10; 62 phydev->duplex = DUPLEX_HALF; 63 64 if (phy_state & PHY_PHYSCR_100MB) 65 phydev->speed = SPEED_100; 66 if (phy_state & PHY_PHYSCR_DUPLEX) 67 phydev->duplex = DUPLEX_FULL; 68 69 phy_state = phy_read(phydev, MII_LPA); 70 if (phy_state < 0) 71 return phy_state; 72 73 mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising, 74 phy_state); 75 76 if (phydev->duplex == DUPLEX_FULL) { 77 if (phy_state & LPA_PAUSE_CAP) 78 phydev->pause = 1; 79 if (phy_state & LPA_PAUSE_ASYM) 80 phydev->asym_pause = 1; 81 } 82 } 83 } 84 return 0; 85 } 86 87 MODULE_DESCRIPTION("Renesas uPD60620 PHY driver"); 88 MODULE_AUTHOR("Bernd Edlinger <bernd.edlinger@hotmail.de>"); 89 MODULE_LICENSE("GPL"); 90 91 static struct phy_driver upd60620_driver[1] = { { 92 .phy_id = UPD60620_PHY_ID, 93 .phy_id_mask = 0xfffffffe, 94 .name = "Renesas uPD60620", 95 .features = PHY_BASIC_FEATURES, 96 .flags = 0, 97 .config_init = upd60620_config_init, 98 .read_status = upd60620_read_status, 99 } }; 100 101 module_phy_driver(upd60620_driver); 102 103 static struct mdio_device_id __maybe_unused upd60620_tbl[] = { 104 { UPD60620_PHY_ID, 0xfffffffe }, 105 { } 106 }; 107 108 MODULE_DEVICE_TABLE(mdio, upd60620_tbl); 109