drivers/net/phy/cortina.c

   1 /*
   2  *    Copyright 2017 NXP
   3  *
   4  *    This program is free software; you can redistribute it and/or modify
   5  *    it under the terms of the GNU General Public License as published by
   6  *    the Free Software Foundation; either version 2 of the License, or
   7  *    (at your option) any later version.
   8  *
   9  *    This program is distributed in the hope that it will be useful,
  10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *    GNU General Public License for more details.
  13  *
  14  *    CORTINA is a registered trademark of Cortina Systems, Inc.
  15  *
  16  */
  17 #include <linux/module.h>
  18 #include <linux/phy.h>
  19
  20 #define PHY_ID_CS4340   0x13e51002
  21
  22 #define VILLA_GLOBAL_CHIP_ID_LSB                        0x0
  23 #define VILLA_GLOBAL_CHIP_ID_MSB                        0x1
  24
  25 #define VILLA_GLOBAL_GPIO_1_INTS                        0x017
  26
  27 static int cortina_read_reg(struct phy_device *phydev, u16 regnum)
  28 {
  29         return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr,
  30                             MII_ADDR_C45 | regnum);
  31 }
  32
  33 static int cortina_read_status(struct phy_device *phydev)
  34 {
  35         int gpio_int_status, ret = 0;
  36
  37         gpio_int_status = cortina_read_reg(phydev, VILLA_GLOBAL_GPIO_1_INTS);
  38         if (gpio_int_status < 0) {
  39                 ret = gpio_int_status;
  40                 goto err;
  41         }
  42
  43         if (gpio_int_status & 0x8) {
  44                 /* up when edc_convergedS set */
  45                 phydev->speed = SPEED_10000;
  46                 phydev->duplex = DUPLEX_FULL;
  47                 phydev->link = 1;
  48         } else {
  49                 phydev->link = 0;
  50         }
  51
  52 err:
  53         return ret;
  54 }
  55
  56 static int cortina_probe(struct phy_device *phydev)
  57 {
  58         u32 phy_id = 0;
  59         int id_lsb = 0, id_msb = 0;
  60
  61         /* Read device id from phy registers. */
  62         id_lsb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_LSB);
  63         if (id_lsb < 0)
  64                 return -ENXIO;
  65
  66         phy_id = id_lsb << 16;
  67
  68         id_msb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_MSB);
  69         if (id_msb < 0)
  70                 return -ENXIO;
  71
  72         phy_id |= id_msb;
  73
  74         /* Make sure the device tree binding matched the driver with the
  75          * right device.
  76          */
  77         if (phy_id != phydev->drv->phy_id) {
  78                 phydev_err(phydev, "Error matching phy with %s driver\n",
  79                            phydev->drv->name);
  80                 return -ENODEV;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static struct phy_driver cortina_driver[] = {
  87 {
  88         .phy_id         = PHY_ID_CS4340,
  89         .phy_id_mask    = 0xffffffff,
  90         .name           = "Cortina CS4340",
  91         .config_init    = gen10g_config_init,
  92         .config_aneg    = gen10g_config_aneg,
  93         .read_status    = cortina_read_status,
  94         .soft_reset     = gen10g_no_soft_reset,
  95         .probe          = cortina_probe,
  96 },
  97 };
  98
  99 module_phy_driver(cortina_driver);
 100
 101 static struct mdio_device_id __maybe_unused cortina_tbl[] = {
 102         { PHY_ID_CS4340, 0xffffffff},
 103         {},
 104 };
 105
 106 MODULE_DEVICE_TABLE(mdio, cortina_tbl);
 107
 108 MODULE_DESCRIPTION("Cortina EDC CDR 10G Ethernet PHY driver");
 109 MODULE_AUTHOR("NXP");
 110 MODULE_LICENSE("GPL");