drivers/net/phy/national.c

   1 /*
   2  * drivers/net/phy/national.c
   3  *
   4  * Driver for National Semiconductor PHYs
   5  *
   6  * Author: Stuart Menefy <stuart.menefy@st.com>
   7  * Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com>
   8  *
   9  * Copyright (c) 2008 STMicroelectronics Limited
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/mii.h>
  21 #include <linux/ethtool.h>
  22 #include <linux/phy.h>
  23 #include <linux/netdevice.h>
  24
  25 /* DP83865 phy identifier values */
  26 #define DP83865_PHY_ID  0x20005c7a
  27
  28 #define DP83865_INT_MASK_REG 0x15
  29 #define DP83865_INT_MASK_STATUS 0x14
  30
  31 #define DP83865_INT_REMOTE_FAULT 0x0008
  32 #define DP83865_INT_ANE_COMPLETED 0x0010
  33 #define DP83865_INT_LINK_CHANGE 0xe000
  34 #define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \
  35                                 DP83865_INT_ANE_COMPLETED | \
  36                                 DP83865_INT_LINK_CHANGE)
  37
  38 /* Advanced proprietary configuration */
  39 #define NS_EXP_MEM_CTL  0x16
  40 #define NS_EXP_MEM_DATA 0x1d
  41 #define NS_EXP_MEM_ADD  0x1e
  42
  43 #define LED_CTRL_REG 0x13
  44 #define AN_FALLBACK_AN 0x0001
  45 #define AN_FALLBACK_CRC 0x0002
  46 #define AN_FALLBACK_IE 0x0004
  47 #define ALL_FALLBACK_ON (AN_FALLBACK_AN |  AN_FALLBACK_CRC | AN_FALLBACK_IE)
  48
  49 enum hdx_loopback {
  50         hdx_loopback_on = 0,
  51         hdx_loopback_off = 1,
  52 };
  53
  54 static u8 ns_exp_read(struct phy_device *phydev, u16 reg)
  55 {
  56         phy_write(phydev, NS_EXP_MEM_ADD, reg);
  57         return phy_read(phydev, NS_EXP_MEM_DATA);
  58 }
  59
  60 static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data)
  61 {
  62         phy_write(phydev, NS_EXP_MEM_ADD, reg);
  63         phy_write(phydev, NS_EXP_MEM_DATA, data);
  64 }
  65
  66 static int ns_config_intr(struct phy_device *phydev)
  67 {
  68         int err;
  69
  70         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  71                 err = phy_write(phydev, DP83865_INT_MASK_REG,
  72                                 DP83865_INT_MASK_DEFAULT);
  73         else
  74                 err = phy_write(phydev, DP83865_INT_MASK_REG, 0);
  75
  76         return err;
  77 }
  78
  79 static int ns_ack_interrupt(struct phy_device *phydev)
  80 {
  81         int ret = phy_read(phydev, DP83865_INT_MASK_STATUS);
  82         if (ret < 0)
  83                 return ret;
  84
  85         return 0;
  86 }
  87
  88 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
  89 {
  90         int bmcr = phy_read(phydev, MII_BMCR);
  91
  92         phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN));
  93
  94         /* Enable 8 bit expended memory read/write (no auto increment) */
  95         phy_write(phydev, NS_EXP_MEM_CTL, 0);
  96         phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0);
  97         phy_write(phydev, NS_EXP_MEM_DATA, 0x0008);
  98         phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN));
  99         phy_write(phydev, LED_CTRL_REG, mode);
 100 }
 101
 102 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
 103 {
 104         if (disable)
 105                 ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1);
 106         else
 107                 ns_exp_write(phydev, 0x1c0,
 108                              ns_exp_read(phydev, 0x1c0) & 0xfffe);
 109
 110         printk(KERN_DEBUG "DP83865 PHY: 10BASE-T HDX loopback %s\n",
 111                (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on");
 112 }
 113
 114 static int ns_config_init(struct phy_device *phydev)
 115 {
 116         ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON);
 117         /* In the latest MAC or switches design, the 10 Mbps loopback
 118            is desired to be turned off. */
 119         ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off);
 120         return ns_ack_interrupt(phydev);
 121 }
 122
 123 static struct phy_driver dp83865_driver = {
 124         .phy_id = DP83865_PHY_ID,
 125         .phy_id_mask = 0xfffffff0,
 126         .name = "NatSemi DP83865",
 127         .features = PHY_GBIT_FEATURES | SUPPORTED_Pause | SUPPORTED_Asym_Pause,
 128         .flags = PHY_HAS_INTERRUPT,
 129         .config_init = ns_config_init,
 130         .config_aneg = genphy_config_aneg,
 131         .read_status = genphy_read_status,
 132         .ack_interrupt = ns_ack_interrupt,
 133         .config_intr = ns_config_intr,
 134         .driver = {.owner = THIS_MODULE,}
 135 };
 136
 137 static int __init ns_init(void)
 138 {
 139         return phy_driver_register(&dp83865_driver);
 140 }
 141
 142 static void __exit ns_exit(void)
 143 {
 144         phy_driver_unregister(&dp83865_driver);
 145 }
 146
 147 MODULE_DESCRIPTION("NatSemi PHY driver");
 148 MODULE_AUTHOR("Stuart Menefy");
 149 MODULE_LICENSE("GPL");
 150
 151 module_init(ns_init);
 152 module_exit(ns_exit);
 153
 154 static struct mdio_device_id __maybe_unused ns_tbl[] = {
 155         { DP83865_PHY_ID, 0xfffffff0 },
 156         { }
 157 };
 158
 159 MODULE_DEVICE_TABLE(mdio, ns_tbl);