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1/* Xilinx GMII2RGMII Converter driver
2 *
3 * Copyright (C) 2016 Xilinx, Inc.
4 * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch>
5 *
6 * Author: Andrew Lunn <andrew@lunn.ch>
7 * Author: Kedareswara rao Appana <appanad@xilinx.com>
8 *
9 * Description:
10 * This driver is developed for Xilinx GMII2RGMII Converter
11 *
12 * This program is free software: you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 */
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/mii.h>
25#include <linux/mdio.h>
26#include <linux/phy.h>
27#include <linux/of_mdio.h>
28
29#define XILINX_GMII2RGMII_REG 0x10
30#define XILINX_GMII2RGMII_SPEED_MASK (BMCR_SPEED1000 | BMCR_SPEED100)
31
32struct gmii2rgmii {
33 struct phy_device *phy_dev;
34 struct phy_driver *phy_drv;
35 struct phy_driver conv_phy_drv;
36 int addr;
37};
38
39static int xgmiitorgmii_read_status(struct phy_device *phydev)
40{
41 struct gmii2rgmii *priv = phydev->priv;
42 u16 val = 0;
43
44 priv->phy_drv->read_status(phydev);
45
46 val = mdiobus_read(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG);
47 val &= ~XILINX_GMII2RGMII_SPEED_MASK;
48
49 if (phydev->speed == SPEED_1000)
50 val |= BMCR_SPEED1000;
51 else if (phydev->speed == SPEED_100)
52 val |= BMCR_SPEED100;
53 else
54 val |= BMCR_SPEED10;
55
56 mdiobus_write(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG, val);
57
58 return 0;
59}
60
61static int xgmiitorgmii_probe(struct mdio_device *mdiodev)
62{
63 struct device *dev = &mdiodev->dev;
64 struct device_node *np = dev->of_node, *phy_node;
65 struct gmii2rgmii *priv;
66
67 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
68 if (!priv)
69 return -ENOMEM;
70
71 phy_node = of_parse_phandle(np, "phy-handle", 0);
72 if (!phy_node) {
73 dev_err(dev, "Couldn't parse phy-handle\n");
74 return -ENODEV;
75 }
76
77 priv->phy_dev = of_phy_find_device(phy_node);
78 of_node_put(phy_node);
79 if (!priv->phy_dev) {
80 dev_info(dev, "Couldn't find phydev\n");
81 return -EPROBE_DEFER;
82 }
83
84 priv->addr = mdiodev->addr;
85 priv->phy_drv = priv->phy_dev->drv;
86 memcpy(&priv->conv_phy_drv, priv->phy_dev->drv,
87 sizeof(struct phy_driver));
88 priv->conv_phy_drv.read_status = xgmiitorgmii_read_status;
89 priv->phy_dev->priv = priv;
90 priv->phy_dev->drv = &priv->conv_phy_drv;
91
92 return 0;
93}
94
95static const struct of_device_id xgmiitorgmii_of_match[] = {
96 { .compatible = "xlnx,gmii-to-rgmii-1.0" },
97 {},
98};
99MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
100
101static struct mdio_driver xgmiitorgmii_driver = {
102 .probe = xgmiitorgmii_probe,
103 .mdiodrv.driver = {
104 .name = "xgmiitorgmii",
105 .of_match_table = xgmiitorgmii_of_match,
106 },
107};
108
109mdio_module_driver(xgmiitorgmii_driver);
110
111MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
112MODULE_LICENSE("GPL");
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
23struct 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
30static 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
60static 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
99static const struct of_device_id xgmiitorgmii_of_match[] = {
100 { .compatible = "xlnx,gmii-to-rgmii-1.0" },
101 {},
102};
103MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
104
105static 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
113mdio_module_driver(xgmiitorgmii_driver);
114
115MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
116MODULE_LICENSE("GPL");