| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | put_device(&priv->phy_dev->mdio.dev); |
| 86 | return -EPROBE_DEFER; |
| 87 | } |
| 88 | |
| 89 | priv->mdio = mdiodev; |
| 90 | priv->phy_drv = priv->phy_dev->drv; |
| 91 | memcpy(&priv->conv_phy_drv, priv->phy_dev->drv, |
| 92 | sizeof(struct phy_driver)); |
| 93 | priv->conv_phy_drv.read_status = xgmiitorgmii_read_status; |
| 94 | mdiodev_set_drvdata(&priv->phy_dev->mdio, priv); |
| 95 | priv->phy_dev->drv = &priv->conv_phy_drv; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static const struct of_device_id xgmiitorgmii_of_match[] = { |
| 101 | { .compatible = "xlnx,gmii-to-rgmii-1.0" }, |
| 102 | {}, |
| 103 | }; |
| 104 | MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match); |
| 105 | |
| 106 | static struct mdio_driver xgmiitorgmii_driver = { |
| 107 | .probe = xgmiitorgmii_probe, |
| 108 | .mdiodrv.driver = { |
| 109 | .name = "xgmiitorgmii", |
| 110 | .of_match_table = xgmiitorgmii_of_match, |
| 111 | }, |
| 112 | }; |
| 113 | |
| 114 | mdio_module_driver(xgmiitorgmii_driver); |
| 115 | |
| 116 | MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver"); |
| 117 | MODULE_LICENSE("GPL"); |