1 // SPDX-License-Identifier: GPL-2.0+
3  * Hisilicon Fast Ethernet MDIO Bus Driver
28 static int hisi_femac_mdio_wait_ready(struct hisi_femac_mdio_data *data)  in hisi_femac_mdio_wait_ready()  argument
32 	return readl_poll_timeout(data->membase + MDIO_RWCTRL,  in hisi_femac_mdio_wait_ready()
36 static int hisi_femac_mdio_read(struct mii_bus *bus, int mii_id, int regnum)  in hisi_femac_mdio_read()  argument
38 	struct hisi_femac_mdio_data *data = bus->priv;  in hisi_femac_mdio_read()  local
41 	ret = hisi_femac_mdio_wait_ready(data);  in hisi_femac_mdio_read()
46 	       data->membase + MDIO_RWCTRL);  in hisi_femac_mdio_read()
48 	ret = hisi_femac_mdio_wait_ready(data);  in hisi_femac_mdio_read()
52 	return readl(data->membase + MDIO_RO_DATA) & 0xFFFF;  in hisi_femac_mdio_read()
55 static int hisi_femac_mdio_write(struct mii_bus *bus, int mii_id, int regnum,  in hisi_femac_mdio_write()  argument
58 	struct hisi_femac_mdio_data *data = bus->priv;  in hisi_femac_mdio_write()  local
61 	ret = hisi_femac_mdio_wait_ready(data);  in hisi_femac_mdio_write()
67 	       data->membase + MDIO_RWCTRL);  in hisi_femac_mdio_write()
69 	return hisi_femac_mdio_wait_ready(data);  in hisi_femac_mdio_write()
74 	struct device_node *np = pdev->dev.of_node;  in hisi_femac_mdio_probe()
75 	struct mii_bus *bus;  in hisi_femac_mdio_probe()  local
76 	struct hisi_femac_mdio_data *data;  in hisi_femac_mdio_probe()  local
79 	bus = mdiobus_alloc_size(sizeof(*data));  in hisi_femac_mdio_probe()
80 	if (!bus)  in hisi_femac_mdio_probe()
81 		return -ENOMEM;  in hisi_femac_mdio_probe()
83 	bus->name = "hisi_femac_mii_bus";  in hisi_femac_mdio_probe()
84 	bus->read = &hisi_femac_mdio_read;  in hisi_femac_mdio_probe()
85 	bus->write = &hisi_femac_mdio_write;  in hisi_femac_mdio_probe()
86 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);  in hisi_femac_mdio_probe()
87 	bus->parent = &pdev->dev;  in hisi_femac_mdio_probe()
89 	data = bus->priv;  in hisi_femac_mdio_probe()
90 	data->membase = devm_platform_ioremap_resource(pdev, 0);  in hisi_femac_mdio_probe()
91 	if (IS_ERR(data->membase)) {  in hisi_femac_mdio_probe()
92 		ret = PTR_ERR(data->membase);  in hisi_femac_mdio_probe()
96 	data->clk = devm_clk_get(&pdev->dev, NULL);  in hisi_femac_mdio_probe()
97 	if (IS_ERR(data->clk)) {  in hisi_femac_mdio_probe()
98 		ret = PTR_ERR(data->clk);  in hisi_femac_mdio_probe()
102 	ret = clk_prepare_enable(data->clk);  in hisi_femac_mdio_probe()
106 	ret = of_mdiobus_register(bus, np);  in hisi_femac_mdio_probe()
110 	platform_set_drvdata(pdev, bus);  in hisi_femac_mdio_probe()
115 	clk_disable_unprepare(data->clk);  in hisi_femac_mdio_probe()
117 	mdiobus_free(bus);  in hisi_femac_mdio_probe()
123 	struct mii_bus *bus = platform_get_drvdata(pdev);  in hisi_femac_mdio_remove()  local
124 	struct hisi_femac_mdio_data *data = bus->priv;  in hisi_femac_mdio_remove()  local
126 	mdiobus_unregister(bus);  in hisi_femac_mdio_remove()
127 	clk_disable_unprepare(data->clk);  in hisi_femac_mdio_remove()
128 	mdiobus_free(bus);  in hisi_femac_mdio_remove()
132 	{ .compatible = "hisilicon,hisi-femac-mdio" },
141 		.name = "hisi-femac-mdio",