drivers/net/phy/xilinx_gmii2rgmii.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Xilinx GMII2RGMII Converter driver
   3  *
   4  * Copyright (C) 2016 Xilinx, Inc.
   5  * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch>
   6  *
   7  * Author: Andrew Lunn <andrew@lunn.ch>
   8  * Author: Kedareswara rao Appana <appanad@xilinx.com>
   9  *
  10  * Description:
  11  * This driver is developed for Xilinx GMII2RGMII Converter
  12  */
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mii.h>
  16 #include <linux/mdio.h>
  17 #include <linux/phy.h>
  18 #include <linux/of_mdio.h>
  19
  20 #define XILINX_GMII2RGMII_REG           0x10
  21 #define XILINX_GMII2RGMII_SPEED_MASK    (BMCR_SPEED1000 | BMCR_SPEED100)
  22
  23 struct gmii2rgmii {
  24         struct phy_device *phy_dev;
  25         struct phy_driver *phy_drv;
  26         struct phy_driver conv_phy_drv;
  27         struct mdio_device *mdio;
  28 };
  29
  30 static int xgmiitorgmii_read_status(struct phy_device *phydev)
  31 {
  32         struct gmii2rgmii *priv = mdiodev_get_drvdata(&phydev->mdio);
  33         struct mii_bus *bus = priv->mdio->bus;
  34         int addr = priv->mdio->addr;
  35         u16 val = 0;
  36         int err;
  37
  38         if (priv->phy_drv->read_status)
  39                 err = priv->phy_drv->read_status(phydev);
  40         else
  41                 err = genphy_read_status(phydev);
  42         if (err < 0)
  43                 return err;
  44
  45         val = mdiobus_read(bus, addr, XILINX_GMII2RGMII_REG);
  46         val &= ~XILINX_GMII2RGMII_SPEED_MASK;
  47
  48         if (phydev->speed == SPEED_1000)
  49                 val |= BMCR_SPEED1000;
  50         else if (phydev->speed == SPEED_100)
  51                 val |= BMCR_SPEED100;
  52         else
  53                 val |= BMCR_SPEED10;
  54
  55         mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val);
  56
  57         return 0;
  58 }
  59
  60 static int xgmiitorgmii_probe(struct mdio_device *mdiodev)
  61 {
  62         struct device *dev = &mdiodev->dev;
  63         struct device_node *np = dev->of_node, *phy_node;
  64         struct gmii2rgmii *priv;
  65
  66         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  67         if (!priv)
  68                 return -ENOMEM;
  69
  70         phy_node = of_parse_phandle(np, "phy-handle", 0);
  71         if (!phy_node) {
  72                 dev_err(dev, "Couldn't parse phy-handle\n");
  73                 return -ENODEV;
  74         }
  75
  76         priv->phy_dev = of_phy_find_device(phy_node);
  77         of_node_put(phy_node);
  78         if (!priv->phy_dev) {
  79                 dev_info(dev, "Couldn't find phydev\n");
  80                 return -EPROBE_DEFER;
  81         }
  82
  83         if (!priv->phy_dev->drv) {
  84                 dev_info(dev, "Attached phy not ready\n");
  85                 return -EPROBE_DEFER;
  86         }
  87
  88         priv->mdio = mdiodev;
  89         priv->phy_drv = priv->phy_dev->drv;
  90         memcpy(&priv->conv_phy_drv, priv->phy_dev->drv,
  91                sizeof(struct phy_driver));
  92         priv->conv_phy_drv.read_status = xgmiitorgmii_read_status;
  93         mdiodev_set_drvdata(&priv->phy_dev->mdio, priv);
  94         priv->phy_dev->drv = &priv->conv_phy_drv;
  95
  96         return 0;
  97 }
  98
  99 static const struct of_device_id xgmiitorgmii_of_match[] = {
 100         { .compatible = "xlnx,gmii-to-rgmii-1.0" },
 101         {},
 102 };
 103 MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
 104
 105 static struct mdio_driver xgmiitorgmii_driver = {
 106         .probe  = xgmiitorgmii_probe,
 107         .mdiodrv.driver = {
 108                 .name = "xgmiitorgmii",
 109                 .of_match_table = xgmiitorgmii_of_match,
 110         },
 111 };
 112
 113 mdio_module_driver(xgmiitorgmii_driver);
 114
 115 MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
 116 MODULE_LICENSE("GPL");