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mdio-ipq8064.c


products/Sources/formale Sprachen/C/Linux/drivers/net/mdio/mdio-ipq8064.c

// SPDX-License-Identifier: GPL-2.0 /* Qualcomm IPQ8064 MDIO interface driver * * Copyright (C) 2019 Christian Lamparter * Copyright (C) 2020 Ansuel Smith */ #include #include #include #include #include #include #include /* MII address register definitions */ #define MII_ADDR_REG_ADDR 0x10 #define MII_BUSY BIT(0) #define MII_WRITE BIT(1) #define MII_CLKRANGE(x) ((x) << 2) #define MII_CLKRANGE_60_100M MII_CLKRANGE(0) #define MII_CLKRANGE_100_150M MII_CLKRANGE(1) #define MII_CLKRANGE_20_35M MII_CLKRANGE(2) #define MII_CLKRANGE_35_60M MII_CLKRANGE(3) #define MII_CLKRANGE_150_250M MII_CLKRANGE(4) #define MII_CLKRANGE_250_300M MII_CLKRANGE(5) #define MII_CLKRANGE_MASK GENMASK(4, 2) #define MII_REG_SHIFT 6 #define MII_REG_MASK GENMASK(10, 6) #define MII_ADDR_SHIFT 11 #define MII_ADDR_MASK GENMASK(15, 11) #define MII_DATA_REG_ADDR 0x14 #define MII_MDIO_DELAY_USEC (1000) #define MII_MDIO_RETRY_MSEC (10) struct ipq8064_mdio { struct regmap *base; /* NSS_GMAC0_BASE */ }; static int ipq8064_mdio_wait_busy(struct ipq8064_mdio *priv) { u32 busy; return regmap_read_poll_timeout(priv->base, MII_ADDR_REG_ADDR, busy, !(busy & MII_BUSY), MII_MDIO_DELAY_USEC, MII_MDIO_RETRY_MSEC * USEC_PER_MSEC); } static int ipq8064_mdio_read(struct mii_bus *bus, int phy_addr, int reg_offset) { u32 miiaddr = MII_BUSY | MII_CLKRANGE_250_300M; struct ipq8064_mdio *priv = bus->priv; u32 ret_val; int err; miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) | ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK); regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr); usleep_range(10, 13); err = ipq8064_mdio_wait_busy(priv); if (err) return err; regmap_read(priv->base, MII_DATA_REG_ADDR, &ret_val); return (int)ret_val; } static int ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data) { u32 miiaddr = MII_WRITE | MII_BUSY | MII_CLKRANGE_250_300M; struct ipq8064_mdio *priv = bus->priv; regmap_write(priv->base, MII_DATA_REG_ADDR, data); miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) | ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK); regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr); /* For the specific reg 31 extra time is needed or the next * read will produce garbage data. */ if (reg_offset == 31) usleep_range(30, 43); else usleep_range(10, 13); return ipq8064_mdio_wait_busy(priv); } static const struct regmap_config ipq8064_mdio_regmap_config = { .reg_bits = 32, .reg_stride = 4, .val_bits = 32, .can_multi_write = false, /* the mdio lock is used by any user of this mdio driver */ .disable_locking = true, .cache_type = REGCACHE_NONE, }; static int ipq8064_mdio_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct ipq8064_mdio *priv; struct resource res; struct mii_bus *bus; void __iomem *base; int ret; if (of_address_to_resource(np, 0, &res)) return -ENOMEM; base = devm_ioremap(&pdev->dev, res.start, resource_size(&res)); if (!base) return -ENOMEM; bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv)); if (!bus) return -ENOMEM; bus->name = "ipq8064_mdio_bus"; bus->read = ipq8064_mdio_read; bus->write = ipq8064_mdio_write; snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev)); bus->parent = &pdev->dev; priv = bus->priv; priv->base = devm_regmap_init_mmio(&pdev->dev, base, &ipq8064_mdio_regmap_config); if (IS_ERR(priv->base)) return PTR_ERR(priv->base); ret = of_mdiobus_register(bus, np); if (ret) return ret; platform_set_drvdata(pdev, bus); return 0; } static void ipq8064_mdio_remove(struct platform_device *pdev) { struct mii_bus *bus = platform_get_drvdata(pdev); mdiobus_unregister(bus); } static const struct of_device_id ipq8064_mdio_dt_ids[] = { { .compatible = "qcom,ipq8064-mdio" }, { } }; MODULE_DEVICE_TABLE(of, ipq8064_mdio_dt_ids); static struct platform_driver ipq8064_mdio_driver = { .probe = ipq8064_mdio_probe, .remove = ipq8064_mdio_remove, .driver = { .name = "ipq8064-mdio", .of_match_table = ipq8064_mdio_dt_ids, }, }; module_platform_driver(ipq8064_mdio_driver); MODULE_DESCRIPTION("Qualcomm IPQ8064 MDIO interface driver"); MODULE_AUTHOR("Christian Lamparter "); MODULE_AUTHOR("Ansuel Smith "); MODULE_LICENSE("GPL");

                                                                                                                                                                                                                                                                                                                                                                                                     

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