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1 | /* Xilinx GMII2RGMII Converter driver |
2 | * | |
3 | * Copyright (C) 2016 Xilinx, Inc. | |
e202d4c6 | 4 | * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch> |
f411a616 | 5 | * |
e202d4c6 | 6 | * Author: Andrew Lunn <andrew@lunn.ch> |
f411a616 ADKR |
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 | ||
32 | struct 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 | ||
39 | static 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 | ||
2698f85e | 61 | static int xgmiitorgmii_probe(struct mdio_device *mdiodev) |
f411a616 ADKR |
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); | |
64721094 | 72 | if (!phy_node) { |
f411a616 ADKR |
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); | |
4d55d014 | 78 | of_node_put(phy_node); |
f411a616 ADKR |
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 | ||
95 | static const struct of_device_id xgmiitorgmii_of_match[] = { | |
96 | { .compatible = "xlnx,gmii-to-rgmii-1.0" }, | |
97 | {}, | |
98 | }; | |
99 | MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match); | |
100 | ||
101 | static 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 | ||
109 | mdio_module_driver(xgmiitorgmii_driver); | |
110 | ||
111 | MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver"); | |
112 | MODULE_LICENSE("GPL"); |