summaryrefslogtreecommitdiff
path: root/drivers/net/phy/xilinx_gmii2rgmii.c
blob: 7b1bc5fcef9b2a923a2803b6149eece41714fbf3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
// SPDX-License-Identifier: GPL-2.0+
/* Xilinx GMII2RGMII Converter driver
 *
 * Copyright (C) 2016 Xilinx, Inc.
 * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch>
 *
 * Author: Andrew Lunn <andrew@lunn.ch>
 * Author: Kedareswara rao Appana <appanad@xilinx.com>
 *
 * Description:
 * This driver is developed for Xilinx GMII2RGMII Converter
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/of_mdio.h>

#define XILINX_GMII2RGMII_REG		0x10
#define XILINX_GMII2RGMII_SPEED_MASK	(BMCR_SPEED1000 | BMCR_SPEED100)

struct gmii2rgmii {
	struct phy_device *phy_dev;
	const struct phy_driver *phy_drv;
	struct phy_driver conv_phy_drv;
	struct mdio_device *mdio;
};

static void xgmiitorgmii_configure(struct gmii2rgmii *priv, int speed)
{
	struct mii_bus *bus = priv->mdio->bus;
	int addr = priv->mdio->addr;
	u16 val;

	val = mdiobus_read(bus, addr, XILINX_GMII2RGMII_REG);
	val &= ~XILINX_GMII2RGMII_SPEED_MASK;

	if (speed == SPEED_1000)
		val |= BMCR_SPEED1000;
	else if (speed == SPEED_100)
		val |= BMCR_SPEED100;
	else
		val |= BMCR_SPEED10;

	mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val);
}

static int xgmiitorgmii_read_status(struct phy_device *phydev)
{
	struct gmii2rgmii *priv = mdiodev_get_drvdata(&phydev->mdio);
	int err;

	if (priv->phy_drv->read_status)
		err = priv->phy_drv->read_status(phydev);
	else
		err = genphy_read_status(phydev);
	if (err < 0)
		return err;

	xgmiitorgmii_configure(priv, phydev->speed);

	return 0;
}

static int xgmiitorgmii_set_loopback(struct phy_device *phydev, bool enable)
{
	struct gmii2rgmii *priv = mdiodev_get_drvdata(&phydev->mdio);
	int err;

	if (priv->phy_drv->set_loopback)
		err = priv->phy_drv->set_loopback(phydev, enable);
	else
		err = genphy_loopback(phydev, enable);
	if (err < 0)
		return err;

	xgmiitorgmii_configure(priv, phydev->speed);

	return 0;
}

static int xgmiitorgmii_probe(struct mdio_device *mdiodev)
{
	struct device *dev = &mdiodev->dev;
	struct device_node *np = dev->of_node, *phy_node;
	struct gmii2rgmii *priv;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	phy_node = of_parse_phandle(np, "phy-handle", 0);
	if (!phy_node) {
		dev_err(dev, "Couldn't parse phy-handle\n");
		return -ENODEV;
	}

	priv->phy_dev = of_phy_find_device(phy_node);
	of_node_put(phy_node);
	if (!priv->phy_dev) {
		dev_info(dev, "Couldn't find phydev\n");
		return -EPROBE_DEFER;
	}

	if (!priv->phy_dev->drv) {
		dev_info(dev, "Attached phy not ready\n");
		put_device(&priv->phy_dev->mdio.dev);
		return -EPROBE_DEFER;
	}

	priv->mdio = mdiodev;
	priv->phy_drv = priv->phy_dev->drv;
	memcpy(&priv->conv_phy_drv, priv->phy_dev->drv,
	       sizeof(struct phy_driver));
	priv->conv_phy_drv.read_status = xgmiitorgmii_read_status;
	priv->conv_phy_drv.set_loopback = xgmiitorgmii_set_loopback;
	mdiodev_set_drvdata(&priv->phy_dev->mdio, priv);
	priv->phy_dev->drv = &priv->conv_phy_drv;

	return 0;
}

static const struct of_device_id xgmiitorgmii_of_match[] = {
	{ .compatible = "xlnx,gmii-to-rgmii-1.0" },
	{},
};
MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);

static struct mdio_driver xgmiitorgmii_driver = {
	.probe	= xgmiitorgmii_probe,
	.mdiodrv.driver = {
		.name = "xgmiitorgmii",
		.of_match_table = xgmiitorgmii_of_match,
	},
};

mdio_module_driver(xgmiitorgmii_driver);

MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
MODULE_LICENSE("GPL");