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 <linux/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_RXPHASE_SEL              (1<<0)  /* Add delay on RX_CLK */
  40 #define IP1001_TXPHASE_SEL              (1<<1)  /* Add delay on TX_CLK */
  41 #define IP1001_SPEC_CTRL_STATUS_2       20      /* IP1001 Spec. Control Reg 2 */
  42 #define IP1001_APS_ON                   11      /* IP1001 APS Mode  bit */
  43 #define IP101A_G_APS_ON                 2       /* IP101A/G APS Mode bit */
  44 #define IP101A_G_IRQ_CONF_STATUS        0x11    /* Conf Info IRQ & Status Reg */
  45 #define IP101A_G_IRQ_PIN_USED           (1<<15) /* INTR pin used */
  46 #define IP101A_G_IRQ_DEFAULT            IP101A_G_IRQ_PIN_USED
  47
  48 static int ip175c_config_init(struct phy_device *phydev)
  49 {
  50         int err, i;
  51         static int full_reset_performed;
  52
  53         if (full_reset_performed == 0) {
  54
  55                 /* master reset */
  56                 err = mdiobus_write(phydev->mdio.bus, 30, 0, 0x175c);
  57                 if (err < 0)
  58                         return err;
  59
  60                 /* ensure no bus delays overlap reset period */
  61                 err = mdiobus_read(phydev->mdio.bus, 30, 0);
  62
  63                 /* data sheet specifies reset period is 2 msec */
  64                 mdelay(2);
  65
  66                 /* enable IP175C mode */
  67                 err = mdiobus_write(phydev->mdio.bus, 29, 31, 0x175c);
  68                 if (err < 0)
  69                         return err;
  70
  71                 /* Set MII0 speed and duplex (in PHY mode) */
  72                 err = mdiobus_write(phydev->mdio.bus, 29, 22, 0x420);
  73                 if (err < 0)
  74                         return err;
  75
  76                 /* reset switch ports */
  77                 for (i = 0; i < 5; i++) {
  78                         err = mdiobus_write(phydev->mdio.bus, i,
  79                                             MII_BMCR, BMCR_RESET);
  80                         if (err < 0)
  81                                 return err;
  82                 }
  83
  84                 for (i = 0; i < 5; i++)
  85                         err = mdiobus_read(phydev->mdio.bus, i, MII_BMCR);
  86
  87                 mdelay(2);
  88
  89                 full_reset_performed = 1;
  90         }
  91
  92         if (phydev->mdio.addr != 4) {
  93                 phydev->state = PHY_RUNNING;
  94                 phydev->speed = SPEED_100;
  95                 phydev->duplex = DUPLEX_FULL;
  96                 phydev->link = 1;
  97                 netif_carrier_on(phydev->attached_dev);
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int ip1xx_reset(struct phy_device *phydev)
 104 {
 105         int bmcr;
 106
 107         /* Software Reset PHY */
 108         bmcr = phy_read(phydev, MII_BMCR);
 109         if (bmcr < 0)
 110                 return bmcr;
 111         bmcr |= BMCR_RESET;
 112         bmcr = phy_write(phydev, MII_BMCR, bmcr);
 113         if (bmcr < 0)
 114                 return bmcr;
 115
 116         do {
 117                 bmcr = phy_read(phydev, MII_BMCR);
 118                 if (bmcr < 0)
 119                         return bmcr;
 120         } while (bmcr & BMCR_RESET);
 121
 122         return 0;
 123 }
 124
 125 static int ip1001_config_init(struct phy_device *phydev)
 126 {
 127         int c;
 128
 129         c = ip1xx_reset(phydev);
 130         if (c < 0)
 131                 return c;
 132
 133         /* Enable Auto Power Saving mode */
 134         c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
 135         if (c < 0)
 136                 return c;
 137         c |= IP1001_APS_ON;
 138         c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
 139         if (c < 0)
 140                 return c;
 141
 142         if (phy_interface_is_rgmii(phydev)) {
 143
 144                 c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 145                 if (c < 0)
 146                         return c;
 147
 148                 c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
 149
 150                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
 151                         c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
 152                 else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
 153                         c |= IP1001_RXPHASE_SEL;
 154                 else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
 155                         c |= IP1001_TXPHASE_SEL;
 156
 157                 c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
 158                 if (c < 0)
 159                         return c;
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int ip101a_g_config_init(struct phy_device *phydev)
 166 {
 167         int c;
 168
 169         c = ip1xx_reset(phydev);
 170         if (c < 0)
 171                 return c;
 172
 173         /* INTR pin used: speed/link/duplex will cause an interrupt */
 174         c = phy_write(phydev, IP101A_G_IRQ_CONF_STATUS, IP101A_G_IRQ_DEFAULT);
 175         if (c < 0)
 176                 return c;
 177
 178         /* Enable Auto Power Saving mode */
 179         c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
 180         c |= IP101A_G_APS_ON;
 181
 182         return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
 183 }
 184
 185 static int ip175c_read_status(struct phy_device *phydev)
 186 {
 187         if (phydev->mdio.addr == 4) /* WAN port */
 188                 genphy_read_status(phydev);
 189         else
 190                 /* Don't need to read status for switch ports */
 191                 phydev->irq = PHY_IGNORE_INTERRUPT;
 192
 193         return 0;
 194 }
 195
 196 static int ip175c_config_aneg(struct phy_device *phydev)
 197 {
 198         if (phydev->mdio.addr == 4) /* WAN port */
 199                 genphy_config_aneg(phydev);
 200
 201         return 0;
 202 }
 203
 204 static int ip101a_g_ack_interrupt(struct phy_device *phydev)
 205 {
 206         int err = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
 207         if (err < 0)
 208                 return err;
 209
 210         return 0;
 211 }
 212
 213 static struct phy_driver icplus_driver[] = {
 214 {
 215         .phy_id         = 0x02430d80,
 216         .name           = "ICPlus IP175C",
 217         .phy_id_mask    = 0x0ffffff0,
 218         .features       = PHY_BASIC_FEATURES,
 219         .config_init    = &ip175c_config_init,
 220         .config_aneg    = &ip175c_config_aneg,
 221         .read_status    = &ip175c_read_status,
 222         .suspend        = genphy_suspend,
 223         .resume         = genphy_resume,
 224 }, {
 225         .phy_id         = 0x02430d90,
 226         .name           = "ICPlus IP1001",
 227         .phy_id_mask    = 0x0ffffff0,
 228         .features       = PHY_GBIT_FEATURES,
 229         .config_init    = &ip1001_config_init,
 230         .suspend        = genphy_suspend,
 231         .resume         = genphy_resume,
 232 }, {
 233         .phy_id         = 0x02430c54,
 234         .name           = "ICPlus IP101A/G",
 235         .phy_id_mask    = 0x0ffffff0,
 236         .features       = PHY_BASIC_FEATURES,
 237         .flags          = PHY_HAS_INTERRUPT,
 238         .ack_interrupt  = ip101a_g_ack_interrupt,
 239         .config_init    = &ip101a_g_config_init,
 240         .suspend        = genphy_suspend,
 241         .resume         = genphy_resume,
 242 } };
 243
 244 module_phy_driver(icplus_driver);
 245
 246 static struct mdio_device_id __maybe_unused icplus_tbl[] = {
 247         { 0x02430d80, 0x0ffffff0 },
 248         { 0x02430d90, 0x0ffffff0 },
 249         { 0x02430c54, 0x0ffffff0 },
 250         { }
 251 };
 252
 253 MODULE_DEVICE_TABLE(mdio, icplus_tbl);