drivers/net/phy/icplus.c

   1 /*
   2  * Driver for ICPlus PHYs
   3  *
   4  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  *
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/string.h>
  14 #include <linux/errno.h>
  15 #include <linux/unistd.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/mm.h>
  24 #include <linux/module.h>
  25 #include <linux/mii.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/phy.h>
  28
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/uaccess.h>
  32
  33 MODULE_DESCRIPTION("ICPlus IP175C PHY driver");
  34 MODULE_AUTHOR("Michael Barkowski");
  35 MODULE_LICENSE("GPL");
  36
  37 static int ip175c_config_init(struct phy_device *phydev)
  38 {
  39         int err, i;
  40         static int full_reset_performed = 0;
  41
  42         if (full_reset_performed == 0) {
  43
  44                 /* master reset */
  45                 err = phydev->bus->write(phydev->bus, 30, 0, 0x175c);
  46                 if (err < 0)
  47                         return err;
  48
  49                 /* ensure no bus delays overlap reset period */
  50                 err = phydev->bus->read(phydev->bus, 30, 0);
  51
  52                 /* data sheet specifies reset period is 2 msec */
  53                 mdelay(2);
  54
  55                 /* enable IP175C mode */
  56                 err = phydev->bus->write(phydev->bus, 29, 31, 0x175c);
  57                 if (err < 0)
  58                         return err;
  59
  60                 /* Set MII0 speed and duplex (in PHY mode) */
  61                 err = phydev->bus->write(phydev->bus, 29, 22, 0x420);
  62                 if (err < 0)
  63                         return err;
  64
  65                 /* reset switch ports */
  66                 for (i = 0; i < 5; i++) {
  67                         err = phydev->bus->write(phydev->bus, i,
  68                                                  MII_BMCR, BMCR_RESET);
  69                         if (err < 0)
  70                                 return err;
  71                 }
  72
  73                 for (i = 0; i < 5; i++)
  74                         err = phydev->bus->read(phydev->bus, i, MII_BMCR);
  75
  76                 mdelay(2);
  77
  78                 full_reset_performed = 1;
  79         }
  80
  81         if (phydev->addr != 4) {
  82                 phydev->state = PHY_RUNNING;
  83                 phydev->speed = SPEED_100;
  84                 phydev->duplex = DUPLEX_FULL;
  85                 phydev->link = 1;
  86                 netif_carrier_on(phydev->attached_dev);
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int ip175c_read_status(struct phy_device *phydev)
  93 {
  94         if (phydev->addr == 4) /* WAN port */
  95                 genphy_read_status(phydev);
  96         else
  97                 /* Don't need to read status for switch ports */
  98                 phydev->irq = PHY_IGNORE_INTERRUPT;
  99
 100         return 0;
 101 }
 102
 103 static int ip175c_config_aneg(struct phy_device *phydev)
 104 {
 105         if (phydev->addr == 4) /* WAN port */
 106                 genphy_config_aneg(phydev);
 107
 108         return 0;
 109 }
 110
 111 static struct phy_driver ip175c_driver = {
 112         .phy_id         = 0x02430d80,
 113         .name           = "ICPlus IP175C",
 114         .phy_id_mask    = 0x0ffffff0,
 115         .features       = PHY_BASIC_FEATURES,
 116         .config_init    = &ip175c_config_init,
 117         .config_aneg    = &ip175c_config_aneg,
 118         .read_status    = &ip175c_read_status,
 119         .suspend        = genphy_suspend,
 120         .resume         = genphy_resume,
 121         .driver         = { .owner = THIS_MODULE,},
 122 };
 123
 124 static int __init ip175c_init(void)
 125 {
 126         return phy_driver_register(&ip175c_driver);
 127 }
 128
 129 static void __exit ip175c_exit(void)
 130 {
 131         phy_driver_unregister(&ip175c_driver);
 132 }
 133
 134 module_init(ip175c_init);
 135 module_exit(ip175c_exit);
 136
 137 static struct mdio_device_id icplus_tbl[] = {
 138         { 0x02430d80, 0x0ffffff0 },
 139         { }
 140 };
 141
 142 MODULE_DEVICE_TABLE(mdio, icplus_tbl);