Lines Matching +full:mdio +full:- +full:bus
1 // SPDX-License-Identifier: GPL-2.0+
3 * Broadcom UniMAC MDIO bus controller driver
5 * Copyright (C) 2014-2017 Broadcom
17 #include <linux/platform_data/mdio-bcm-unimac.h>
50 * peripheral registers for CPU-native byte order.
53 return __raw_readl(priv->base + offset);
55 return readl_relaxed(priv->base + offset);
62 __raw_writel(val, priv->base + offset);
64 writel_relaxed(val, priv->base + offset);
91 static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
93 struct unimac_mdio_priv *priv = bus->priv;
97 ret = clk_prepare_enable(priv->clk);
105 /* Start MDIO transaction */
108 ret = priv->wait_func(priv->wait_func_data);
115 * turn-around, e.g: Broadcom BCM53125 external switches, so check for
116 * that condition here and ignore the MDIO controller read failure
119 if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (cmd & MDIO_READ_FAIL)) {
120 ret = -EIO;
126 clk_disable_unprepare(priv->clk);
130 static int unimac_mdio_write(struct mii_bus *bus, int phy_id,
133 struct unimac_mdio_priv *priv = bus->priv;
137 ret = clk_prepare_enable(priv->clk);
148 ret = priv->wait_func(priv->wait_func_data);
149 clk_disable_unprepare(priv->clk);
155 * their internal MDIO management controller making them fail to successfully
162 * there (e.g: during system-wide power management).
164 * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
166 * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
169 static int unimac_mdio_reset(struct mii_bus *bus)
171 struct device_node *np = bus->dev.of_node;
177 read_mask = ~bus->phy_mask;
180 addr = of_mdio_parse_addr(&bus->dev, child);
190 dev_dbg(&bus->dev, "Workaround for PHY @ %d\n", addr);
191 mdiobus_read(bus, addr, MII_BMSR);
205 if (!priv->clk_freq)
208 ret = clk_prepare_enable(priv->clk);
212 if (!priv->clk)
215 rate = clk_get_rate(priv->clk);
217 div = (rate / (2 * priv->clk_freq)) - 1;
219 pr_warn("Incorrect MDIO clock frequency, ignoring\n");
224 /* The MDIO clock is the reference clock (typically 250Mhz) divided by
232 clk_disable_unprepare(priv->clk);
238 struct unimac_mdio_pdata *pdata = pdev->dev.platform_data;
241 struct mii_bus *bus;
245 np = pdev->dev.of_node;
247 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
249 return -ENOMEM;
253 return -EINVAL;
255 /* Just ioremap, as this MDIO block is usually integrated into an
258 priv->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
259 if (!priv->base) {
260 dev_err(&pdev->dev, "failed to remap register\n");
261 return -ENOMEM;
264 if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq))
265 priv->clk_freq = 0;
267 priv->mii_bus = mdiobus_alloc();
268 if (!priv->mii_bus)
269 return -ENOMEM;
271 bus = priv->mii_bus;
272 bus->priv = priv;
274 bus->name = pdata->bus_name;
275 priv->wait_func = pdata->wait_func;
276 priv->wait_func_data = pdata->wait_func_data;
277 bus->phy_mask = ~pdata->phy_mask;
278 priv->clk = pdata->clk;
280 bus->name = "unimac MII bus";
281 priv->wait_func_data = priv;
282 priv->wait_func = unimac_mdio_poll;
283 priv->clk = devm_clk_get_optional(&pdev->dev, NULL);
286 if (IS_ERR(priv->clk)) {
287 ret = PTR_ERR(priv->clk);
291 bus->parent = &pdev->dev;
292 bus->read = unimac_mdio_read;
293 bus->write = unimac_mdio_write;
294 bus->reset = unimac_mdio_reset;
295 snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
301 ret = of_mdiobus_register(bus, np);
303 dev_err(&pdev->dev, "MDIO bus registration failed\n");
309 dev_info(&pdev->dev, "Broadcom UniMAC MDIO bus\n");
314 mdiobus_free(bus);
322 mdiobus_unregister(priv->mii_bus);
323 mdiobus_free(priv->mii_bus);
337 { .compatible = "brcm,asp-v3.0-mdio", },
338 { .compatible = "brcm,asp-v2.2-mdio", },
339 { .compatible = "brcm,asp-v2.1-mdio", },
340 { .compatible = "brcm,bcm6846-mdio", },
341 { .compatible = "brcm,genet-mdio-v5", },
342 { .compatible = "brcm,genet-mdio-v4", },
343 { .compatible = "brcm,genet-mdio-v3", },
344 { .compatible = "brcm,genet-mdio-v2", },
345 { .compatible = "brcm,genet-mdio-v1", },
346 { .compatible = "brcm,unimac-mdio", },
363 MODULE_DESCRIPTION("Broadcom UniMAC MDIO bus controller");