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. in unimac_mdio_readl()
53 return __raw_readl(priv->base + offset); in unimac_mdio_readl()
55 return readl_relaxed(priv->base + offset); in unimac_mdio_readl()
62 __raw_writel(val, priv->base + offset); in unimac_mdio_writel()
64 writel_relaxed(val, priv->base + offset); in unimac_mdio_writel()
91 static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg) in unimac_mdio_read() argument
93 struct unimac_mdio_priv *priv = bus->priv; in unimac_mdio_read()
101 /* Start MDIO transaction */ in unimac_mdio_read()
104 ret = priv->wait_func(priv->wait_func_data); in unimac_mdio_read()
111 * turn-around, e.g: Broadcom BCM53125 external switches, so check for in unimac_mdio_read()
112 * that condition here and ignore the MDIO controller read failure in unimac_mdio_read()
115 if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (cmd & MDIO_READ_FAIL)) in unimac_mdio_read()
116 return -EIO; in unimac_mdio_read()
121 static int unimac_mdio_write(struct mii_bus *bus, int phy_id, in unimac_mdio_write() argument
124 struct unimac_mdio_priv *priv = bus->priv; in unimac_mdio_write()
134 return priv->wait_func(priv->wait_func_data); in unimac_mdio_write()
138 * their internal MDIO management controller making them fail to successfully
145 * there (e.g: during system-wide power management).
147 * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
149 * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
152 static int unimac_mdio_reset(struct mii_bus *bus) in unimac_mdio_reset() argument
154 struct device_node *np = bus->dev.of_node; in unimac_mdio_reset()
160 read_mask = ~bus->phy_mask; in unimac_mdio_reset()
163 addr = of_mdio_parse_addr(&bus->dev, child); in unimac_mdio_reset()
173 dev_dbg(&bus->dev, "Workaround for PHY @ %d\n", addr); in unimac_mdio_reset()
174 mdiobus_read(bus, addr, MII_BMSR); in unimac_mdio_reset()
187 if (!priv->clk_freq) in unimac_mdio_clk_set()
190 if (!priv->clk) in unimac_mdio_clk_set()
193 rate = clk_get_rate(priv->clk); in unimac_mdio_clk_set()
195 div = (rate / (2 * priv->clk_freq)) - 1; in unimac_mdio_clk_set()
197 pr_warn("Incorrect MDIO clock frequency, ignoring\n"); in unimac_mdio_clk_set()
201 /* The MDIO clock is the reference clock (typically 250Mhz) divided by in unimac_mdio_clk_set()
212 struct unimac_mdio_pdata *pdata = pdev->dev.platform_data; in unimac_mdio_probe()
215 struct mii_bus *bus; in unimac_mdio_probe() local
219 np = pdev->dev.of_node; in unimac_mdio_probe()
221 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); in unimac_mdio_probe()
223 return -ENOMEM; in unimac_mdio_probe()
227 return -EINVAL; in unimac_mdio_probe()
229 /* Just ioremap, as this MDIO block is usually integrated into an in unimac_mdio_probe()
232 priv->base = devm_ioremap(&pdev->dev, r->start, resource_size(r)); in unimac_mdio_probe()
233 if (!priv->base) { in unimac_mdio_probe()
234 dev_err(&pdev->dev, "failed to remap register\n"); in unimac_mdio_probe()
235 return -ENOMEM; in unimac_mdio_probe()
238 priv->clk = devm_clk_get_optional(&pdev->dev, NULL); in unimac_mdio_probe()
239 if (IS_ERR(priv->clk)) in unimac_mdio_probe()
240 return PTR_ERR(priv->clk); in unimac_mdio_probe()
242 ret = clk_prepare_enable(priv->clk); in unimac_mdio_probe()
246 if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq)) in unimac_mdio_probe()
247 priv->clk_freq = 0; in unimac_mdio_probe()
251 priv->mii_bus = mdiobus_alloc(); in unimac_mdio_probe()
252 if (!priv->mii_bus) { in unimac_mdio_probe()
253 ret = -ENOMEM; in unimac_mdio_probe()
257 bus = priv->mii_bus; in unimac_mdio_probe()
258 bus->priv = priv; in unimac_mdio_probe()
260 bus->name = pdata->bus_name; in unimac_mdio_probe()
261 priv->wait_func = pdata->wait_func; in unimac_mdio_probe()
262 priv->wait_func_data = pdata->wait_func_data; in unimac_mdio_probe()
263 bus->phy_mask = ~pdata->phy_mask; in unimac_mdio_probe()
265 bus->name = "unimac MII bus"; in unimac_mdio_probe()
266 priv->wait_func_data = priv; in unimac_mdio_probe()
267 priv->wait_func = unimac_mdio_poll; in unimac_mdio_probe()
269 bus->parent = &pdev->dev; in unimac_mdio_probe()
270 bus->read = unimac_mdio_read; in unimac_mdio_probe()
271 bus->write = unimac_mdio_write; in unimac_mdio_probe()
272 bus->reset = unimac_mdio_reset; in unimac_mdio_probe()
273 snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id); in unimac_mdio_probe()
275 ret = of_mdiobus_register(bus, np); in unimac_mdio_probe()
277 dev_err(&pdev->dev, "MDIO bus registration failed\n"); in unimac_mdio_probe()
283 dev_info(&pdev->dev, "Broadcom UniMAC MDIO bus\n"); in unimac_mdio_probe()
288 mdiobus_free(bus); in unimac_mdio_probe()
290 clk_disable_unprepare(priv->clk); in unimac_mdio_probe()
298 mdiobus_unregister(priv->mii_bus); in unimac_mdio_remove()
299 mdiobus_free(priv->mii_bus); in unimac_mdio_remove()
300 clk_disable_unprepare(priv->clk); in unimac_mdio_remove()
307 clk_disable_unprepare(priv->clk); in unimac_mdio_suspend()
317 ret = clk_prepare_enable(priv->clk); in unimac_mdio_resume()
330 { .compatible = "brcm,asp-v2.1-mdio", },
331 { .compatible = "brcm,asp-v2.0-mdio", },
332 { .compatible = "brcm,genet-mdio-v5", },
333 { .compatible = "brcm,genet-mdio-v4", },
334 { .compatible = "brcm,genet-mdio-v3", },
335 { .compatible = "brcm,genet-mdio-v2", },
336 { .compatible = "brcm,genet-mdio-v1", },
337 { .compatible = "brcm,unimac-mdio", },
354 MODULE_DESCRIPTION("Broadcom UniMAC MDIO bus controller");