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_c45_read(phydev->mdio.bus, phydev->mdio.addr, 0, regnum);
  21 }
  22
  23 static int cortina_read_status(struct phy_device *phydev)
  24 {
  25         int gpio_int_status, ret = 0;
  26
  27         gpio_int_status = cortina_read_reg(phydev, VILLA_GLOBAL_GPIO_1_INTS);
  28         if (gpio_int_status < 0) {
  29                 ret = gpio_int_status;
  30                 goto err;
  31         }
  32
  33         if (gpio_int_status & 0x8) {
  34                 /* up when edc_convergedS set */
  35                 phydev->speed = SPEED_10000;
  36                 phydev->duplex = DUPLEX_FULL;
  37                 phydev->link = 1;
  38         } else {
  39                 phydev->link = 0;
  40         }
  41
  42 err:
  43         return ret;
  44 }
  45
  46 static int cortina_probe(struct phy_device *phydev)
  47 {
  48         u32 phy_id = 0;
  49         int id_lsb = 0, id_msb = 0;
  50
  51         /* Read device id from phy registers. */
  52         id_lsb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_LSB);
  53         if (id_lsb < 0)
  54                 return -ENXIO;
  55
  56         phy_id = id_lsb << 16;
  57
  58         id_msb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_MSB);
  59         if (id_msb < 0)
  60                 return -ENXIO;
  61
  62         phy_id |= id_msb;
  63
  64         /* Make sure the device tree binding matched the driver with the
  65          * right device.
  66          */
  67         if (phy_id != phydev->drv->phy_id) {
  68                 phydev_err(phydev, "Error matching phy with %s driver\n",
  69                            phydev->drv->name);
  70                 return -ENODEV;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static struct phy_driver cortina_driver[] = {
  77 {
  78         .phy_id         = PHY_ID_CS4340,
  79         .phy_id_mask    = 0xffffffff,
  80         .name           = "Cortina CS4340",
  81         .features       = PHY_10GBIT_FEATURES,
  82         .config_aneg    = gen10g_config_aneg,
  83         .read_status    = cortina_read_status,
  84         .probe          = cortina_probe,
  85 },
  86 };
  87
  88 module_phy_driver(cortina_driver);
  89
  90 static struct mdio_device_id __maybe_unused cortina_tbl[] = {
  91         { PHY_ID_CS4340, 0xffffffff},
  92         {},
  93 };
  94
  95 MODULE_DEVICE_TABLE(mdio, cortina_tbl);
  96
  97 MODULE_DESCRIPTION("Cortina EDC CDR 10G Ethernet PHY driver");
  98 MODULE_AUTHOR("NXP");
  99 MODULE_LICENSE("GPL");