drivers/net/phy/davicom.c

   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);