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/IP101A/IP101G/IC1001 PHY drivers");
  34 MODULE_AUTHOR("Michael Barkowski");
  35 MODULE_LICENSE("GPL");
  36
  37 /* IP101A/G - IP1001 */
  38 #define IP10XX_SPEC_CTRL_STATUS         16      /* Spec. Control Register */
  39 #define IP1001_SPEC_CTRL_STATUS_2       20      /* IP1001 Spec. Control Reg 2 */
  40 #define IP1001_PHASE_SEL_MASK           3       /* IP1001 RX/TXPHASE_SEL */
  41 #define IP1001_APS_ON                   11      /* IP1001 APS Mode  bit */
  42 #define IP101A_G_APS_ON                 2       /* IP101A/G APS Mode bit */
  43
  44 static int ip175c_config_init(struct phy_device *phydev)
  45 {
  46         int err, i;
  47         static int full_reset_performed = 0;
  48
  49         if (full_reset_performed == 0) {
  50
  51                 /* master reset */
  52                 err = mdiobus_write(phydev->bus, 30, 0, 0x175c);
  53                 if (err < 0)
  54                         return err;
  55
  56                 /* ensure no bus delays overlap reset period */
  57                 err = mdiobus_read(phydev->bus, 30, 0);
  58
  59                 /* data sheet specifies reset period is 2 msec */
  60                 mdelay(2);
  61
  62                 /* enable IP175C mode */
  63                 err = mdiobus_write(phydev->bus, 29, 31, 0x175c);
  64                 if (err < 0)
  65                         return err;
  66
  67                 /* Set MII0 speed and duplex (in PHY mode) */
  68                 err = mdiobus_write(phydev->bus, 29, 22, 0x420);
  69                 if (err < 0)
  70                         return err;
  71
  72                 /* reset switch ports */
  73                 for (i = 0; i < 5; i++) {
  74                         err = mdiobus_write(phydev->bus, i,
  75                                             MII_BMCR, BMCR_RESET);
  76                         if (err < 0)
  77                                 return err;
  78                 }
  79
  80                 for (i = 0; i < 5; i++)
  81                         err = mdiobus_read(phydev->bus, i, MII_BMCR);
  82
  83                 mdelay(2);
  84
  85                 full_reset_performed = 1;
  86         }
  87
  88         if (phydev->addr != 4) {
  89                 phydev->state = PHY_RUNNING;
  90                 phydev->speed = SPEED_100;
  91                 phydev->duplex = DUPLEX_FULL;
  92                 phydev->link = 1;
  93                 netif_carrier_on(phydev->attached_dev);
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int ip1xx_reset(struct phy_device *phydev)
 100 {
 101         int bmcr;
 102
 103         /* Software Reset PHY */
 104         bmcr = phy_read(phydev, MII_BMCR);
 105         if (bmcr < 0)
 106                 return bmcr;
 107         bmcr |= BMCR_RESET;
 108         bmcr = phy_write(phydev, MII_BMCR, bmcr);
 109         if (bmcr < 0)
 110                 return bmcr;
 111
 112         do {
 113                 bmcr = phy_read(phydev, MII_BMCR);
 114                 if (bmcr < 0)
 115                         return bmcr;
 116         } while (bmcr & BMCR_RESET);
 117
 118         return 0;
 119 }
 120
 121 static int ip1001_config_init(struct phy_device *phydev)
 122 {
 123         int c;
 124
 125         c = ip1xx_reset(phydev);
 126         if (c < 0)
 127                 return c;
 128
 129         /* Enable Auto Power Saving mode */
 130         c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
 131         if (c < 0)
 132                 return c;
 133         c |= IP1001_APS_ON;
 134         c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
 135         if (c < 0)
 136                 return c;
 137
 138         if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
 139                 /* Additional delay (2ns) used to adjust RX clock phase
 140                  * at RGMII interface */
 141                 c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 142                 if (c < 0)
 143                         return c;
 144
 145                 c |= IP1001_PHASE_SEL_MASK;
 146                 c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
 147                 if (c < 0)
 148                         return c;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int ip101a_g_config_init(struct phy_device *phydev)
 155 {
 156         int c;
 157
 158         c = ip1xx_reset(phydev);
 159         if (c < 0)
 160                 return c;
 161
 162         /* Enable Auto Power Saving mode */
 163         c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 164         c |= IP101A_G_APS_ON;
 165
 166         return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
 167 }
 168
 169 static int ip175c_read_status(struct phy_device *phydev)
 170 {
 171         if (phydev->addr == 4) /* WAN port */
 172                 genphy_read_status(phydev);
 173         else
 174                 /* Don't need to read status for switch ports */
 175                 phydev->irq = PHY_IGNORE_INTERRUPT;
 176
 177         return 0;
 178 }
 179
 180 static int ip175c_config_aneg(struct phy_device *phydev)
 181 {
 182         if (phydev->addr == 4) /* WAN port */
 183                 genphy_config_aneg(phydev);
 184
 185         return 0;
 186 }
 187
 188 static struct phy_driver ip175c_driver = {
 189         .phy_id         = 0x02430d80,
 190         .name           = "ICPlus IP175C",
 191         .phy_id_mask    = 0x0ffffff0,
 192         .features       = PHY_BASIC_FEATURES,
 193         .config_init    = &ip175c_config_init,
 194         .config_aneg    = &ip175c_config_aneg,
 195         .read_status    = &ip175c_read_status,
 196         .suspend        = genphy_suspend,
 197         .resume         = genphy_resume,
 198         .driver         = { .owner = THIS_MODULE,},
 199 };
 200
 201 static struct phy_driver ip1001_driver = {
 202         .phy_id         = 0x02430d90,
 203         .name           = "ICPlus IP1001",
 204         .phy_id_mask    = 0x0ffffff0,
 205         .features       = PHY_GBIT_FEATURES | SUPPORTED_Pause |
 206                           SUPPORTED_Asym_Pause,
 207         .flags          = PHY_HAS_INTERRUPT,
 208         .config_init    = &ip1001_config_init,
 209         .config_aneg    = &genphy_config_aneg,
 210         .read_status    = &genphy_read_status,
 211         .suspend        = genphy_suspend,
 212         .resume         = genphy_resume,
 213         .driver         = { .owner = THIS_MODULE,},
 214 };
 215
 216 static struct phy_driver ip101a_g_driver = {
 217         .phy_id         = 0x02430c54,
 218         .name           = "ICPlus IP101A/G",
 219         .phy_id_mask    = 0x0ffffff0,
 220         .features       = PHY_BASIC_FEATURES | SUPPORTED_Pause |
 221                           SUPPORTED_Asym_Pause,
 222         .flags          = PHY_HAS_INTERRUPT,
 223         .config_init    = &ip101a_g_config_init,
 224         .config_aneg    = &genphy_config_aneg,
 225         .read_status    = &genphy_read_status,
 226         .suspend        = genphy_suspend,
 227         .resume         = genphy_resume,
 228         .driver         = { .owner = THIS_MODULE,},
 229 };
 230
 231 static int __init icplus_init(void)
 232 {
 233         int ret = 0;
 234
 235         ret = phy_driver_register(&ip1001_driver);
 236         if (ret < 0)
 237                 return -ENODEV;
 238
 239         ret = phy_driver_register(&ip101a_g_driver);
 240         if (ret < 0)
 241                 return -ENODEV;
 242
 243         return phy_driver_register(&ip175c_driver);
 244 }
 245
 246 static void __exit icplus_exit(void)
 247 {
 248         phy_driver_unregister(&ip1001_driver);
 249         phy_driver_unregister(&ip101a_g_driver);
 250         phy_driver_unregister(&ip175c_driver);
 251 }
 252
 253 module_init(icplus_init);
 254 module_exit(icplus_exit);
 255
 256 static struct mdio_device_id __maybe_unused icplus_tbl[] = {
 257         { 0x02430d80, 0x0ffffff0 },
 258         { 0x02430d90, 0x0ffffff0 },
 259         { 0x02430c54, 0x0ffffff0 },
 260         { }
 261 };
 262
 263 MODULE_DEVICE_TABLE(mdio, icplus_tbl);