1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2014-2017 Broadcom
21 #include <linux/platform_data/mdio-bcm-unimac.h>
52 	 * peripheral registers for CPU-native byte order.  in unimac_mdio_readl()
55 		return __raw_readl(priv->base + offset);  in unimac_mdio_readl()
57 		return readl_relaxed(priv->base + offset);  in unimac_mdio_readl()
64 		__raw_writel(val, priv->base + offset);  in unimac_mdio_writel()
66 		writel_relaxed(val, priv->base + offset);  in unimac_mdio_writel()
93 	} while (--timeout);  in unimac_mdio_poll()
95 	return -ETIMEDOUT;  in unimac_mdio_poll()
100 	struct unimac_mdio_priv *priv = bus->priv;  in unimac_mdio_read()
111 	ret = priv->wait_func(priv->wait_func_data);  in unimac_mdio_read()
117 	/* Some broken devices are known not to release the line during  in unimac_mdio_read()
118 	 * turn-around, e.g: Broadcom BCM53125 external switches, so check for  in unimac_mdio_read()
122 	if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (cmd & MDIO_READ_FAIL))  in unimac_mdio_read()
123 		return -EIO;  in unimac_mdio_read()
131 	struct unimac_mdio_priv *priv = bus->priv;  in unimac_mdio_write()
141 	return priv->wait_func(priv->wait_func_data);  in unimac_mdio_write()
152  * there (e.g: during system-wide power management).
154  * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
156  * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
161 	struct device_node *np = bus->dev.of_node;  in unimac_mdio_reset()
167 		read_mask = ~bus->phy_mask;  in unimac_mdio_reset()
170 			addr = of_mdio_parse_addr(&bus->dev, child);  in unimac_mdio_reset()
180 			dev_dbg(&bus->dev, "Workaround for PHY @ %d\n", addr);  in unimac_mdio_reset()
194 	if (!priv->clk_freq)  in unimac_mdio_clk_set()
197 	if (!priv->clk)  in unimac_mdio_clk_set()
200 		rate = clk_get_rate(priv->clk);  in unimac_mdio_clk_set()
202 	div = (rate / (2 * priv->clk_freq)) - 1;  in unimac_mdio_clk_set()
219 	struct unimac_mdio_pdata *pdata = pdev->dev.platform_data;  in unimac_mdio_probe()
226 	np = pdev->dev.of_node;  in unimac_mdio_probe()
228 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in unimac_mdio_probe()
230 		return -ENOMEM;  in unimac_mdio_probe()
234 		return -EINVAL;  in unimac_mdio_probe()
239 	priv->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));  in unimac_mdio_probe()
240 	if (!priv->base) {  in unimac_mdio_probe()
241 		dev_err(&pdev->dev, "failed to remap register\n");  in unimac_mdio_probe()
242 		return -ENOMEM;  in unimac_mdio_probe()
245 	priv->clk = devm_clk_get_optional(&pdev->dev, NULL);  in unimac_mdio_probe()
246 	if (IS_ERR(priv->clk))  in unimac_mdio_probe()
247 		return PTR_ERR(priv->clk);  in unimac_mdio_probe()
249 	ret = clk_prepare_enable(priv->clk);  in unimac_mdio_probe()
253 	if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq))  in unimac_mdio_probe()
254 		priv->clk_freq = 0;  in unimac_mdio_probe()
258 	priv->mii_bus = mdiobus_alloc();  in unimac_mdio_probe()
259 	if (!priv->mii_bus) {  in unimac_mdio_probe()
260 		ret = -ENOMEM;  in unimac_mdio_probe()
264 	bus = priv->mii_bus;  in unimac_mdio_probe()
265 	bus->priv = priv;  in unimac_mdio_probe()
267 		bus->name = pdata->bus_name;  in unimac_mdio_probe()
268 		priv->wait_func = pdata->wait_func;  in unimac_mdio_probe()
269 		priv->wait_func_data = pdata->wait_func_data;  in unimac_mdio_probe()
270 		bus->phy_mask = ~pdata->phy_mask;  in unimac_mdio_probe()
272 		bus->name = "unimac MII bus";  in unimac_mdio_probe()
273 		priv->wait_func_data = priv;  in unimac_mdio_probe()
274 		priv->wait_func = unimac_mdio_poll;  in unimac_mdio_probe()
276 	bus->parent = &pdev->dev;  in unimac_mdio_probe()
277 	bus->read = unimac_mdio_read;  in unimac_mdio_probe()
278 	bus->write = unimac_mdio_write;  in unimac_mdio_probe()
279 	bus->reset = unimac_mdio_reset;  in unimac_mdio_probe()
280 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);  in unimac_mdio_probe()
284 		dev_err(&pdev->dev, "MDIO bus registration failed\n");  in unimac_mdio_probe()
290 	dev_info(&pdev->dev, "Broadcom UniMAC MDIO bus\n");  in unimac_mdio_probe()
297 	clk_disable_unprepare(priv->clk);  in unimac_mdio_probe()
305 	mdiobus_unregister(priv->mii_bus);  in unimac_mdio_remove()
306 	mdiobus_free(priv->mii_bus);  in unimac_mdio_remove()
307 	clk_disable_unprepare(priv->clk);  in unimac_mdio_remove()
316 	clk_disable_unprepare(priv->clk);  in unimac_mdio_suspend()
326 	ret = clk_prepare_enable(priv->clk);  in unimac_mdio_resume()
339 	{ .compatible = "brcm,genet-mdio-v5", },
340 	{ .compatible = "brcm,genet-mdio-v4", },
341 	{ .compatible = "brcm,genet-mdio-v3", },
342 	{ .compatible = "brcm,genet-mdio-v2", },
343 	{ .compatible = "brcm,genet-mdio-v1", },
344 	{ .compatible = "brcm,unimac-mdio", },