drivers/net/phy/et1011c.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * drivers/net/phy/et1011c.c
   4  *
   5  * Driver for LSI ET1011C PHYs
   6  *
   7  * Author: Chaithrika U S
   8  *
   9  * Copyright (c) 2008 Texas Instruments
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/string.h>
  13 #include <linux/errno.h>
  14 #include <linux/unistd.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/mm.h>
  23 #include <linux/module.h>
  24 #include <linux/mii.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/phy.h>
  27 #include <linux/io.h>
  28 #include <linux/uaccess.h>
  29 #include <asm/irq.h>
  30
  31 #define ET1011C_STATUS_REG      (0x1A)
  32 #define ET1011C_CONFIG_REG      (0x16)
  33 #define ET1011C_SPEED_MASK              (0x0300)
  34 #define ET1011C_GIGABIT_SPEED           (0x0200)
  35 #define ET1011C_TX_FIFO_MASK            (0x3000)
  36 #define ET1011C_TX_FIFO_DEPTH_8         (0x0000)
  37 #define ET1011C_TX_FIFO_DEPTH_16        (0x1000)
  38 #define ET1011C_INTERFACE_MASK          (0x0007)
  39 #define ET1011C_GMII_INTERFACE          (0x0002)
  40 #define ET1011C_SYS_CLK_EN              (0x01 << 4)
  41
  42
  43 MODULE_DESCRIPTION("LSI ET1011C PHY driver");
  44 MODULE_AUTHOR("Chaithrika U S");
  45 MODULE_LICENSE("GPL");
  46
  47 static int et1011c_config_aneg(struct phy_device *phydev)
  48 {
  49         int ctl = phy_read(phydev, MII_BMCR);
  50
  51         if (ctl < 0)
  52                 return ctl;
  53         ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 |
  54                  BMCR_ANENABLE);
  55         /* First clear the PHY */
  56         phy_write(phydev, MII_BMCR, ctl | BMCR_RESET);
  57
  58         return genphy_config_aneg(phydev);
  59 }
  60
  61 static int et1011c_read_status(struct phy_device *phydev)
  62 {
  63         static int speed;
  64         int ret;
  65         u32 val;
  66
  67         ret = genphy_read_status(phydev);
  68
  69         if (speed != phydev->speed) {
  70                 speed = phydev->speed;
  71                 val = phy_read(phydev, ET1011C_STATUS_REG);
  72                 if ((val & ET1011C_SPEED_MASK) ==
  73                                         ET1011C_GIGABIT_SPEED) {
  74                         val = phy_read(phydev, ET1011C_CONFIG_REG);
  75                         val &= ~ET1011C_TX_FIFO_MASK;
  76                         phy_write(phydev, ET1011C_CONFIG_REG, val |
  77                                           ET1011C_GMII_INTERFACE |
  78                                           ET1011C_SYS_CLK_EN |
  79                                           ET1011C_TX_FIFO_DEPTH_16);
  80
  81                 }
  82         }
  83         return ret;
  84 }
  85
  86 static struct phy_driver et1011c_driver[] = { {
  87         .phy_id         = 0x0282f014,
  88         .name           = "ET1011C",
  89         .phy_id_mask    = 0xfffffff0,
  90         /* PHY_GBIT_FEATURES */
  91         .config_aneg    = et1011c_config_aneg,
  92         .read_status    = et1011c_read_status,
  93 } };
  94
  95 module_phy_driver(et1011c_driver);
  96
  97 static struct mdio_device_id __maybe_unused et1011c_tbl[] = {
  98         { 0x0282f014, 0xfffffff0 },
  99         { }
 100 };
 101
 102 MODULE_DEVICE_TABLE(mdio, et1011c_tbl);