drivers/net/phy/cortina.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *    Copyright 2017 NXP
   4  *
   5  *    CORTINA is a registered trademark of Cortina Systems, Inc.
   6  *
   7  */
   8 #include <linux/module.h>
   9 #include <linux/phy.h>
  10
  11 #define PHY_ID_CS4340   0x13e51002
  12
  13 #define VILLA_GLOBAL_CHIP_ID_LSB                        0x0
  14 #define VILLA_GLOBAL_CHIP_ID_MSB                        0x1
  15
  16 #define VILLA_GLOBAL_GPIO_1_INTS                        0x017
  17
  18 static int cortina_read_reg(struct phy_device *phydev, u16 regnum)
  19 {
  20         return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr,
  21                             MII_ADDR_C45 | regnum);
  22 }
  23
  24 static int cortina_read_status(struct phy_device *phydev)
  25 {
  26         int gpio_int_status, ret = 0;
  27
  28         gpio_int_status = cortina_read_reg(phydev, VILLA_GLOBAL_GPIO_1_INTS);
  29         if (gpio_int_status < 0) {
  30                 ret = gpio_int_status;
  31                 goto err;
  32         }
  33
  34         if (gpio_int_status & 0x8) {
  35                 /* up when edc_convergedS set */
  36                 phydev->speed = SPEED_10000;
  37                 phydev->duplex = DUPLEX_FULL;
  38                 phydev->link = 1;
  39         } else {
  40                 phydev->link = 0;
  41         }
  42
  43 err:
  44         return ret;
  45 }
  46
  47 static int cortina_probe(struct phy_device *phydev)
  48 {
  49         u32 phy_id = 0;
  50         int id_lsb = 0, id_msb = 0;
  51
  52         /* Read device id from phy registers. */
  53         id_lsb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_LSB);
  54         if (id_lsb < 0)
  55                 return -ENXIO;
  56
  57         phy_id = id_lsb << 16;
  58
  59         id_msb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_MSB);
  60         if (id_msb < 0)
  61                 return -ENXIO;
  62
  63         phy_id |= id_msb;
  64
  65         /* Make sure the device tree binding matched the driver with the
  66          * right device.
  67          */
  68         if (phy_id != phydev->drv->phy_id) {
  69                 phydev_err(phydev, "Error matching phy with %s driver\n",
  70                            phydev->drv->name);
  71                 return -ENODEV;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static struct phy_driver cortina_driver[] = {
  78 {
  79         .phy_id         = PHY_ID_CS4340,
  80         .phy_id_mask    = 0xffffffff,
  81         .name           = "Cortina CS4340",
  82         .features       = PHY_10GBIT_FEATURES,
  83         .config_aneg    = gen10g_config_aneg,
  84         .read_status    = cortina_read_status,
  85         .soft_reset     = genphy_no_soft_reset,
  86         .probe          = cortina_probe,
  87 },
  88 };
  89
  90 module_phy_driver(cortina_driver);
  91
  92 static struct mdio_device_id __maybe_unused cortina_tbl[] = {
  93         { PHY_ID_CS4340, 0xffffffff},
  94         {},
  95 };
  96
  97 MODULE_DEVICE_TABLE(mdio, cortina_tbl);
  98
  99 MODULE_DESCRIPTION("Cortina EDC CDR 10G Ethernet PHY driver");
 100 MODULE_AUTHOR("NXP");
 101 MODULE_LICENSE("GPL");