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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/mii.h>
  23 #include <linux/ethtool.h>
  24 #include <linux/phy.h>
  25 #include <linux/netdevice.h>
  26
  27 #define DEBUG
  28
  29 /* DP83865 phy identifier values */
  30 #define DP83865_PHY_ID  0x20005c7a
  31
  32 #define DP83865_INT_STATUS      0x14
  33 #define DP83865_INT_MASK        0x15
  34 #define DP83865_INT_CLEAR       0x17
  35
  36 #define DP83865_INT_REMOTE_FAULT 0x0008
  37 #define DP83865_INT_ANE_COMPLETED 0x0010
  38 #define DP83865_INT_LINK_CHANGE 0xe000
  39 #define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \
  40                                 DP83865_INT_ANE_COMPLETED | \
  41                                 DP83865_INT_LINK_CHANGE)
  42
  43 /* Advanced proprietary configuration */
  44 #define NS_EXP_MEM_CTL  0x16
  45 #define NS_EXP_MEM_DATA 0x1d
  46 #define NS_EXP_MEM_ADD  0x1e
  47
  48 #define LED_CTRL_REG 0x13
  49 #define AN_FALLBACK_AN 0x0001
  50 #define AN_FALLBACK_CRC 0x0002
  51 #define AN_FALLBACK_IE 0x0004
  52 #define ALL_FALLBACK_ON (AN_FALLBACK_AN |  AN_FALLBACK_CRC | AN_FALLBACK_IE)
  53
  54 enum hdx_loopback {
  55         hdx_loopback_on = 0,
  56         hdx_loopback_off = 1,
  57 };
  58
  59 static u8 ns_exp_read(struct phy_device *phydev, u16 reg)
  60 {
  61         phy_write(phydev, NS_EXP_MEM_ADD, reg);
  62         return phy_read(phydev, NS_EXP_MEM_DATA);
  63 }
  64
  65 static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data)
  66 {
  67         phy_write(phydev, NS_EXP_MEM_ADD, reg);
  68         phy_write(phydev, NS_EXP_MEM_DATA, data);
  69 }
  70
  71 static int ns_config_intr(struct phy_device *phydev)
  72 {
  73         int err;
  74
  75         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  76                 err = phy_write(phydev, DP83865_INT_MASK,
  77                                 DP83865_INT_MASK_DEFAULT);
  78         else
  79                 err = phy_write(phydev, DP83865_INT_MASK, 0);
  80
  81         return err;
  82 }
  83
  84 static int ns_ack_interrupt(struct phy_device *phydev)
  85 {
  86         int ret = phy_read(phydev, DP83865_INT_STATUS);
  87         if (ret < 0)
  88                 return ret;
  89
  90         /* Clear the interrupt status bit by writing a “1”
  91          * to the corresponding bit in INT_CLEAR (2:0 are reserved) */
  92         ret = phy_write(phydev, DP83865_INT_CLEAR, ret & ~0x7);
  93
  94         return ret;
  95 }
  96
  97 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
  98 {
  99         int bmcr = phy_read(phydev, MII_BMCR);
 100
 101         phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN));
 102
 103         /* Enable 8 bit expended memory read/write (no auto increment) */
 104         phy_write(phydev, NS_EXP_MEM_CTL, 0);
 105         phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0);
 106         phy_write(phydev, NS_EXP_MEM_DATA, 0x0008);
 107         phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN));
 108         phy_write(phydev, LED_CTRL_REG, mode);
 109 }
 110
 111 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
 112 {
 113         if (disable)
 114                 ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1);
 115         else
 116                 ns_exp_write(phydev, 0x1c0,
 117                              ns_exp_read(phydev, 0x1c0) & 0xfffe);
 118
 119         pr_debug("10BASE-T HDX loopback %s\n",
 120                  (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on");
 121 }
 122
 123 static int ns_config_init(struct phy_device *phydev)
 124 {
 125         ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON);
 126         /* In the latest MAC or switches design, the 10 Mbps loopback
 127            is desired to be turned off. */
 128         ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off);
 129         return ns_ack_interrupt(phydev);
 130 }
 131
 132 static struct phy_driver dp83865_driver[] = { {
 133         .phy_id = DP83865_PHY_ID,
 134         .phy_id_mask = 0xfffffff0,
 135         .name = "NatSemi DP83865",
 136         .features = PHY_GBIT_FEATURES,
 137         .flags = PHY_HAS_INTERRUPT,
 138         .config_init = ns_config_init,
 139         .config_aneg = genphy_config_aneg,
 140         .read_status = genphy_read_status,
 141         .ack_interrupt = ns_ack_interrupt,
 142         .config_intr = ns_config_intr,
 143 } };
 144
 145 module_phy_driver(dp83865_driver);
 146
 147 MODULE_DESCRIPTION("NatSemi PHY driver");
 148 MODULE_AUTHOR("Stuart Menefy");
 149 MODULE_LICENSE("GPL");
 150
 151 static struct mdio_device_id __maybe_unused ns_tbl[] = {
 152         { DP83865_PHY_ID, 0xfffffff0 },
 153         { }
 154 };
 155
 156 MODULE_DEVICE_TABLE(mdio, ns_tbl);