1 // SPDX-License-Identifier: GPL-2.0
3  * Allwinner EMAC MDIO interface driver
5  * Copyright 2012-2013 Stefan Roese <sr@denx.de>
6  * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
38 	struct sun4i_mdio_data *data = bus->priv;  in sun4i_mdio_read()
43 	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);  in sun4i_mdio_read()
45 	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_read()
49 	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {  in sun4i_mdio_read()
51 			return -ETIMEDOUT;  in sun4i_mdio_read()
56 	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_read()
58 	value = readl(data->membase + EMAC_MAC_MRDD_REG);  in sun4i_mdio_read()
66 	struct sun4i_mdio_data *data = bus->priv;  in sun4i_mdio_write()
70 	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);  in sun4i_mdio_write()
72 	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_write()
76 	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {  in sun4i_mdio_write()
78 			return -ETIMEDOUT;  in sun4i_mdio_write()
83 	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);  in sun4i_mdio_write()
85 	writel(value, data->membase + EMAC_MAC_MWTD_REG);  in sun4i_mdio_write()
92 	struct device_node *np = pdev->dev.of_node;  in sun4i_mdio_probe()
99 		return -ENOMEM;  in sun4i_mdio_probe()
101 	bus->name = "sun4i_mii_bus";  in sun4i_mdio_probe()
102 	bus->read = &sun4i_mdio_read;  in sun4i_mdio_probe()
103 	bus->write = &sun4i_mdio_write;  in sun4i_mdio_probe()
104 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));  in sun4i_mdio_probe()
105 	bus->parent = &pdev->dev;  in sun4i_mdio_probe()
107 	data = bus->priv;  in sun4i_mdio_probe()
108 	data->membase = devm_platform_ioremap_resource(pdev, 0);  in sun4i_mdio_probe()
109 	if (IS_ERR(data->membase)) {  in sun4i_mdio_probe()
110 		ret = PTR_ERR(data->membase);  in sun4i_mdio_probe()
114 	data->regulator = devm_regulator_get(&pdev->dev, "phy");  in sun4i_mdio_probe()
115 	if (IS_ERR(data->regulator)) {  in sun4i_mdio_probe()
116 		if (PTR_ERR(data->regulator) == -EPROBE_DEFER) {  in sun4i_mdio_probe()
117 			ret = -EPROBE_DEFER;  in sun4i_mdio_probe()
121 		dev_info(&pdev->dev, "no regulator found\n");  in sun4i_mdio_probe()
122 		data->regulator = NULL;  in sun4i_mdio_probe()
124 		ret = regulator_enable(data->regulator);  in sun4i_mdio_probe()
138 	if (data->regulator)  in sun4i_mdio_probe()
139 		regulator_disable(data->regulator);  in sun4i_mdio_probe()
148 	struct sun4i_mdio_data *data = bus->priv;  in sun4i_mdio_remove()
151 	if (data->regulator)  in sun4i_mdio_remove()
152 		regulator_disable(data->regulator);  in sun4i_mdio_remove()
157 	{ .compatible = "allwinner,sun4i-a10-mdio" },
160 	{ .compatible = "allwinner,sun4i-mdio" },
169 		.name = "sun4i-mdio",
176 MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
177 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");