4  * Copyright 2012-2013 Stefan Roese <sr@denx.de>
5  * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
39 static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)  in sun4i_mdio_read()  argument
41 	struct sun4i_mdio_data *data = bus->priv;  in sun4i_mdio_read()  local
46 	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);  in sun4i_mdio_read()
48 	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_read()
52 	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {  in sun4i_mdio_read()
54 			return -ETIMEDOUT;  in sun4i_mdio_read()
59 	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_read()
60 	/* and read data */  in sun4i_mdio_read()
61 	value = readl(data->membase + EMAC_MAC_MRDD_REG);  in sun4i_mdio_read()
66 static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,  in sun4i_mdio_write()  argument
69 	struct sun4i_mdio_data *data = bus->priv;  in sun4i_mdio_write()  local
73 	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);  in sun4i_mdio_write()
75 	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_write()
79 	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {  in sun4i_mdio_write()
81 			return -ETIMEDOUT;  in sun4i_mdio_write()
86 	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_write()
87 	/* and write data */  in sun4i_mdio_write()
88 	writel(value, data->membase + EMAC_MAC_MWTD_REG);  in sun4i_mdio_write()
95 	struct device_node *np = pdev->dev.of_node;  in sun4i_mdio_probe()
96 	struct mii_bus *bus;  in sun4i_mdio_probe()  local
97 	struct sun4i_mdio_data *data;  in sun4i_mdio_probe()  local
101 	bus = mdiobus_alloc_size(sizeof(*data));  in sun4i_mdio_probe()
102 	if (!bus)  in sun4i_mdio_probe()
103 		return -ENOMEM;  in sun4i_mdio_probe()
105 	bus->name = "sun4i_mii_bus";  in sun4i_mdio_probe()
106 	bus->read = &sun4i_mdio_read;  in sun4i_mdio_probe()
107 	bus->write = &sun4i_mdio_write;  in sun4i_mdio_probe()
108 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));  in sun4i_mdio_probe()
109 	bus->parent = &pdev->dev;  in sun4i_mdio_probe()
111 	data = bus->priv;  in sun4i_mdio_probe()
113 	data->membase = devm_ioremap_resource(&pdev->dev, res);  in sun4i_mdio_probe()
114 	if (IS_ERR(data->membase)) {  in sun4i_mdio_probe()
115 		ret = PTR_ERR(data->membase);  in sun4i_mdio_probe()
119 	data->regulator = devm_regulator_get(&pdev->dev, "phy");  in sun4i_mdio_probe()
120 	if (IS_ERR(data->regulator)) {  in sun4i_mdio_probe()
121 		if (PTR_ERR(data->regulator) == -EPROBE_DEFER) {  in sun4i_mdio_probe()
122 			ret = -EPROBE_DEFER;  in sun4i_mdio_probe()
126 		dev_info(&pdev->dev, "no regulator found\n");  in sun4i_mdio_probe()
127 		data->regulator = NULL;  in sun4i_mdio_probe()
129 		ret = regulator_enable(data->regulator);  in sun4i_mdio_probe()
134 	ret = of_mdiobus_register(bus, np);  in sun4i_mdio_probe()
138 	platform_set_drvdata(pdev, bus);  in sun4i_mdio_probe()
143 	if (data->regulator)  in sun4i_mdio_probe()
144 		regulator_disable(data->regulator);  in sun4i_mdio_probe()
146 	mdiobus_free(bus);  in sun4i_mdio_probe()
152 	struct mii_bus *bus = platform_get_drvdata(pdev);  in sun4i_mdio_remove()  local
154 	mdiobus_unregister(bus);  in sun4i_mdio_remove()
155 	mdiobus_free(bus);  in sun4i_mdio_remove()
161 	{ .compatible = "allwinner,sun4i-a10-mdio" },
164 	{ .compatible = "allwinner,sun4i-mdio" },
173 		.name = "sun4i-mdio",
181 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");