drivers/net/phy/qsemi.c

   1 /*
   2  * drivers/net/phy/qsemi.c
   3  *
   4  * Driver for Quality Semiconductor PHYs
   5  *
   6  * Author: Andy Fleming
   7  *
   8  * Copyright (c) 2004 Freescale Semiconductor, Inc.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  *
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/string.h>
  18 #include <linux/errno.h>
  19 #include <linux/unistd.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/init.h>
  22 #include <linux/delay.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mii.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/phy.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/irq.h>
  35 #include <linux/uaccess.h>
  36
  37 /* ------------------------------------------------------------------------- */
  38 /* The Quality Semiconductor QS6612 is used on the RPX CLLF                  */
  39
  40 /* register definitions */
  41
  42 #define MII_QS6612_MCR          17  /* Mode Control Register      */
  43 #define MII_QS6612_FTR          27  /* Factory Test Register      */
  44 #define MII_QS6612_MCO          28  /* Misc. Control Register     */
  45 #define MII_QS6612_ISR          29  /* Interrupt Source Register  */
  46 #define MII_QS6612_IMR          30  /* Interrupt Mask Register    */
  47 #define MII_QS6612_IMR_INIT     0x003a
  48 #define MII_QS6612_PCR          31  /* 100BaseTx PHY Control Reg. */
  49
  50 #define QS6612_PCR_AN_COMPLETE  0x1000
  51 #define QS6612_PCR_RLBEN        0x0200
  52 #define QS6612_PCR_DCREN        0x0100
  53 #define QS6612_PCR_4B5BEN       0x0040
  54 #define QS6612_PCR_TX_ISOLATE   0x0020
  55 #define QS6612_PCR_MLT3_DIS     0x0002
  56 #define QS6612_PCR_SCRM_DESCRM  0x0001
  57
  58 MODULE_DESCRIPTION("Quality Semiconductor PHY driver");
  59 MODULE_AUTHOR("Andy Fleming");
  60 MODULE_LICENSE("GPL");
  61
  62 /* Returns 0, unless there's a write error */
  63 static int qs6612_config_init(struct phy_device *phydev)
  64 {
  65         /* The PHY powers up isolated on the RPX,
  66          * so send a command to allow operation.
  67          * XXX - My docs indicate this should be 0x0940
  68          * ...or something.  The current value sets three
  69          * reserved bits, bit 11, which specifies it should be
  70          * set to one, bit 10, which specifies it should be set
  71          * to 0, and bit 7, which doesn't specify.  However, my
  72          * docs are preliminary, and I will leave it like this
  73          * until someone more knowledgable corrects me or it.
  74          * -- Andy Fleming
  75          */
  76         return phy_write(phydev, MII_QS6612_PCR, 0x0dc0);
  77 }
  78
  79 static int qs6612_ack_interrupt(struct phy_device *phydev)
  80 {
  81         int err;
  82
  83         err = phy_read(phydev, MII_QS6612_ISR);
  84
  85         if (err < 0)
  86                 return err;
  87
  88         err = phy_read(phydev, MII_BMSR);
  89
  90         if (err < 0)
  91                 return err;
  92
  93         err = phy_read(phydev, MII_EXPANSION);
  94
  95         if (err < 0)
  96                 return err;
  97
  98         return 0;
  99 }
 100
 101 static int qs6612_config_intr(struct phy_device *phydev)
 102 {
 103         int err;
 104         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 105                 err = phy_write(phydev, MII_QS6612_IMR,
 106                                 MII_QS6612_IMR_INIT);
 107         else
 108                 err = phy_write(phydev, MII_QS6612_IMR, 0);
 109
 110         return err;
 111
 112 }
 113
 114 static struct phy_driver qs6612_driver[] = { {
 115         .phy_id         = 0x00181440,
 116         .name           = "QS6612",
 117         .phy_id_mask    = 0xfffffff0,
 118         .features       = PHY_BASIC_FEATURES,
 119         .flags          = PHY_HAS_INTERRUPT,
 120         .config_init    = qs6612_config_init,
 121         .config_aneg    = genphy_config_aneg,
 122         .read_status    = genphy_read_status,
 123         .ack_interrupt  = qs6612_ack_interrupt,
 124         .config_intr    = qs6612_config_intr,
 125 } };
 126
 127 module_phy_driver(qs6612_driver);
 128
 129 static struct mdio_device_id __maybe_unused qs6612_tbl[] = {
 130         { 0x00181440, 0xfffffff0 },
 131         { }
 132 };
 133
 134 MODULE_DEVICE_TABLE(mdio, qs6612_tbl);