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_config_aneg(struct phy_device *phydev)
  34 {
  35         phydev->supported = SUPPORTED_10000baseT_Full;
  36         phydev->advertising = SUPPORTED_10000baseT_Full;
  37
  38         return 0;
  39 }
  40
  41 static int cortina_read_status(struct phy_device *phydev)
  42 {
  43         int gpio_int_status, ret = 0;
  44
  45         gpio_int_status = cortina_read_reg(phydev, VILLA_GLOBAL_GPIO_1_INTS);
  46         if (gpio_int_status < 0) {
  47                 ret = gpio_int_status;
  48                 goto err;
  49         }
  50
  51         if (gpio_int_status & 0x8) {
  52                 /* up when edc_convergedS set */
  53                 phydev->speed = SPEED_10000;
  54                 phydev->duplex = DUPLEX_FULL;
  55                 phydev->link = 1;
  56         } else {
  57                 phydev->link = 0;
  58         }
  59
  60 err:
  61         return ret;
  62 }
  63
  64 static int cortina_soft_reset(struct phy_device *phydev)
  65 {
  66         return 0;
  67 }
  68
  69 static int cortina_probe(struct phy_device *phydev)
  70 {
  71         u32 phy_id = 0;
  72         int id_lsb = 0, id_msb = 0;
  73
  74         /* Read device id from phy registers. */
  75         id_lsb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_LSB);
  76         if (id_lsb < 0)
  77                 return -ENXIO;
  78
  79         phy_id = id_lsb << 16;
  80
  81         id_msb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_MSB);
  82         if (id_msb < 0)
  83                 return -ENXIO;
  84
  85         phy_id |= id_msb;
  86
  87         /* Make sure the device tree binding matched the driver with the
  88          * right device.
  89          */
  90         if (phy_id != phydev->drv->phy_id) {
  91                 phydev_err(phydev, "Error matching phy with %s driver\n",
  92                            phydev->drv->name);
  93                 return -ENODEV;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static struct phy_driver cortina_driver[] = {
 100 {
 101         .phy_id         = PHY_ID_CS4340,
 102         .phy_id_mask    = 0xffffffff,
 103         .name           = "Cortina CS4340",
 104         .config_aneg    = cortina_config_aneg,
 105         .read_status    = cortina_read_status,
 106         .soft_reset     = cortina_soft_reset,
 107         .probe          = cortina_probe,
 108 },
 109 };
 110
 111 module_phy_driver(cortina_driver);
 112
 113 static struct mdio_device_id __maybe_unused cortina_tbl[] = {
 114         { PHY_ID_CS4340, 0xffffffff},
 115         {},
 116 };
 117
 118 MODULE_DEVICE_TABLE(mdio, cortina_tbl);
 119
 120 MODULE_DESCRIPTION("Cortina EDC CDR 10G Ethernet PHY driver");
 121 MODULE_AUTHOR("NXP");
 122 MODULE_LICENSE("GPL");