1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * drivers/net/phy/davicom.c 4 * 5 * Driver for Davicom PHYs 6 * 7 * Author: Andy Fleming 8 * 9 * Copyright (c) 2004 Freescale Semiconductor, Inc. 10 */ 11 #include <linux/kernel.h> 12 #include <linux/string.h> 13 #include <linux/errno.h> 14 #include <linux/unistd.h> 15 #include <linux/interrupt.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <linux/netdevice.h> 19 #include <linux/etherdevice.h> 20 #include <linux/skbuff.h> 21 #include <linux/spinlock.h> 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/mii.h> 25 #include <linux/ethtool.h> 26 #include <linux/phy.h> 27 28 #include <asm/io.h> 29 #include <asm/irq.h> 30 #include <linux/uaccess.h> 31 32 #define MII_DM9161_SCR 0x10 33 #define MII_DM9161_SCR_INIT 0x0610 34 #define MII_DM9161_SCR_RMII 0x0100 35 36 /* DM9161 Interrupt Register */ 37 #define MII_DM9161_INTR 0x15 38 #define MII_DM9161_INTR_PEND 0x8000 39 #define MII_DM9161_INTR_DPLX_MASK 0x0800 40 #define MII_DM9161_INTR_SPD_MASK 0x0400 41 #define MII_DM9161_INTR_LINK_MASK 0x0200 42 #define MII_DM9161_INTR_MASK 0x0100 43 #define MII_DM9161_INTR_DPLX_CHANGE 0x0010 44 #define MII_DM9161_INTR_SPD_CHANGE 0x0008 45 #define MII_DM9161_INTR_LINK_CHANGE 0x0004 46 #define MII_DM9161_INTR_INIT 0x0000 47 #define MII_DM9161_INTR_STOP \ 48 (MII_DM9161_INTR_DPLX_MASK | MII_DM9161_INTR_SPD_MASK \ 49 | MII_DM9161_INTR_LINK_MASK | MII_DM9161_INTR_MASK) 50 51 /* DM9161 10BT Configuration/Status */ 52 #define MII_DM9161_10BTCSR 0x12 53 #define MII_DM9161_10BTCSR_INIT 0x7800 54 55 MODULE_DESCRIPTION("Davicom PHY driver"); 56 MODULE_AUTHOR("Andy Fleming"); 57 MODULE_LICENSE("GPL"); 58 59 60 #define DM9161_DELAY 1 61 static int dm9161_config_intr(struct phy_device *phydev) 62 { 63 int temp; 64 65 temp = phy_read(phydev, MII_DM9161_INTR); 66 67 if (temp < 0) 68 return temp; 69 70 if (PHY_INTERRUPT_ENABLED == phydev->interrupts) 71 temp &= ~(MII_DM9161_INTR_STOP); 72 else 73 temp |= MII_DM9161_INTR_STOP; 74 75 temp = phy_write(phydev, MII_DM9161_INTR, temp); 76 77 return temp; 78 } 79 80 static int dm9161_config_aneg(struct phy_device *phydev) 81 { 82 int err; 83 84 /* Isolate the PHY */ 85 err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE); 86 87 if (err < 0) 88 return err; 89 90 /* Configure the new settings */ 91 err = genphy_config_aneg(phydev); 92 93 if (err < 0) 94 return err; 95 96 return 0; 97 } 98 99 static int dm9161_config_init(struct phy_device *phydev) 100 { 101 int err, temp; 102 103 /* Isolate the PHY */ 104 err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE); 105 106 if (err < 0) 107 return err; 108 109 switch (phydev->interface) { 110 case PHY_INTERFACE_MODE_MII: 111 temp = MII_DM9161_SCR_INIT; 112 break; 113 case PHY_INTERFACE_MODE_RMII: 114 temp = MII_DM9161_SCR_INIT | MII_DM9161_SCR_RMII; 115 break; 116 default: 117 return -EINVAL; 118 } 119 120 /* Do not bypass the scrambler/descrambler */ 121 err = phy_write(phydev, MII_DM9161_SCR, temp); 122 if (err < 0) 123 return err; 124 125 /* Clear 10BTCSR to default */ 126 err = phy_write(phydev, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT); 127 128 if (err < 0) 129 return err; 130 131 /* Reconnect the PHY, and enable Autonegotiation */ 132 return phy_write(phydev, MII_BMCR, BMCR_ANENABLE); 133 } 134 135 static int dm9161_ack_interrupt(struct phy_device *phydev) 136 { 137 int err = phy_read(phydev, MII_DM9161_INTR); 138 139 return (err < 0) ? err : 0; 140 } 141 142 static struct phy_driver dm91xx_driver[] = { 143 { 144 .phy_id = 0x0181b880, 145 .name = "Davicom DM9161E", 146 .phy_id_mask = 0x0ffffff0, 147 /* PHY_BASIC_FEATURES */ 148 .config_init = dm9161_config_init, 149 .config_aneg = dm9161_config_aneg, 150 .ack_interrupt = dm9161_ack_interrupt, 151 .config_intr = dm9161_config_intr, 152 }, { 153 .phy_id = 0x0181b8b0, 154 .name = "Davicom DM9161B/C", 155 .phy_id_mask = 0x0ffffff0, 156 /* PHY_BASIC_FEATURES */ 157 .config_init = dm9161_config_init, 158 .config_aneg = dm9161_config_aneg, 159 .ack_interrupt = dm9161_ack_interrupt, 160 .config_intr = dm9161_config_intr, 161 }, { 162 .phy_id = 0x0181b8a0, 163 .name = "Davicom DM9161A", 164 .phy_id_mask = 0x0ffffff0, 165 /* PHY_BASIC_FEATURES */ 166 .config_init = dm9161_config_init, 167 .config_aneg = dm9161_config_aneg, 168 .ack_interrupt = dm9161_ack_interrupt, 169 .config_intr = dm9161_config_intr, 170 }, { 171 .phy_id = 0x00181b80, 172 .name = "Davicom DM9131", 173 .phy_id_mask = 0x0ffffff0, 174 /* PHY_BASIC_FEATURES */ 175 .ack_interrupt = dm9161_ack_interrupt, 176 .config_intr = dm9161_config_intr, 177 } }; 178 179 module_phy_driver(dm91xx_driver); 180 181 static struct mdio_device_id __maybe_unused davicom_tbl[] = { 182 { 0x0181b880, 0x0ffffff0 }, 183 { 0x0181b8b0, 0x0ffffff0 }, 184 { 0x0181b8a0, 0x0ffffff0 }, 185 { 0x00181b80, 0x0ffffff0 }, 186 { } 187 }; 188 189 MODULE_DEVICE_TABLE(mdio, davicom_tbl); 190