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/slab.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/mii.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/phy.h>
  29
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32 #include <asm/uaccess.h>
  33
  34 MODULE_DESCRIPTION("ICPlus IP175C PHY driver");
  35 MODULE_AUTHOR("Michael Barkowski");
  36 MODULE_LICENSE("GPL");
  37
  38 static int ip175c_config_init(struct phy_device *phydev)
  39 {
  40         int err, i;
  41         static int full_reset_performed = 0;
  42
  43         if (full_reset_performed == 0) {
  44
  45                 /* master reset */
  46                 err = phydev->bus->write(phydev->bus, 30, 0, 0x175c);
  47                 if (err < 0)
  48                         return err;
  49
  50                 /* ensure no bus delays overlap reset period */
  51                 err = phydev->bus->read(phydev->bus, 30, 0);
  52
  53                 /* data sheet specifies reset period is 2 msec */
  54                 mdelay(2);
  55
  56                 /* enable IP175C mode */
  57                 err = phydev->bus->write(phydev->bus, 29, 31, 0x175c);
  58                 if (err < 0)
  59                         return err;
  60
  61                 /* Set MII0 speed and duplex (in PHY mode) */
  62                 err = phydev->bus->write(phydev->bus, 29, 22, 0x420);
  63                 if (err < 0)
  64                         return err;
  65
  66                 /* reset switch ports */
  67                 for (i = 0; i < 5; i++) {
  68                         err = phydev->bus->write(phydev->bus, i,
  69                                                  MII_BMCR, BMCR_RESET);
  70                         if (err < 0)
  71                                 return err;
  72                 }
  73
  74                 for (i = 0; i < 5; i++)
  75                         err = phydev->bus->read(phydev->bus, i, MII_BMCR);
  76
  77                 mdelay(2);
  78
  79                 full_reset_performed = 1;
  80         }
  81
  82         if (phydev->addr != 4) {
  83                 phydev->state = PHY_RUNNING;
  84                 phydev->speed = SPEED_100;
  85                 phydev->duplex = DUPLEX_FULL;
  86                 phydev->link = 1;
  87                 netif_carrier_on(phydev->attached_dev);
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int ip175c_read_status(struct phy_device *phydev)
  94 {
  95         if (phydev->addr == 4) /* WAN port */
  96                 genphy_read_status(phydev);
  97         else
  98                 /* Don't need to read status for switch ports */
  99                 phydev->irq = PHY_IGNORE_INTERRUPT;
 100
 101         return 0;
 102 }
 103
 104 static int ip175c_config_aneg(struct phy_device *phydev)
 105 {
 106         if (phydev->addr == 4) /* WAN port */
 107                 genphy_config_aneg(phydev);
 108
 109         return 0;
 110 }
 111
 112 static struct phy_driver ip175c_driver = {
 113         .phy_id         = 0x02430d80,
 114         .name           = "ICPlus IP175C",
 115         .phy_id_mask    = 0x0ffffff0,
 116         .features       = PHY_BASIC_FEATURES,
 117         .config_init    = &ip175c_config_init,
 118         .config_aneg    = &ip175c_config_aneg,
 119         .read_status    = &ip175c_read_status,
 120         .driver         = { .owner = THIS_MODULE,},
 121 };
 122
 123 static int __init ip175c_init(void)
 124 {
 125         return phy_driver_register(&ip175c_driver);
 126 }
 127
 128 static void __exit ip175c_exit(void)
 129 {
 130         phy_driver_unregister(&ip175c_driver);
 131 }
 132
 133 module_init(ip175c_init);
 134 module_exit(ip175c_exit);