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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | // SPDX-License-Identifier: GPL-2.0 /* * Allwinner EMAC MDIO interface driver * * Copyright 2012-2013 Stefan Roese <sr@denx.de> * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com> * * Based on the Linux driver provided by Allwinner: * Copyright (C) 1997 Sten Wang */ #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of_address.h> #include <linux/of_mdio.h> #include <linux/phy.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> #define EMAC_MAC_MCMD_REG (0x00) #define EMAC_MAC_MADR_REG (0x04) #define EMAC_MAC_MWTD_REG (0x08) #define EMAC_MAC_MRDD_REG (0x0c) #define EMAC_MAC_MIND_REG (0x10) #define EMAC_MAC_SSRR_REG (0x14) #define MDIO_TIMEOUT (msecs_to_jiffies(100)) struct sun4i_mdio_data { void __iomem *membase; struct regulator *regulator; }; static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum) { struct sun4i_mdio_data *data = bus->priv; unsigned long timeout_jiffies; int value; /* issue the phy address and reg */ writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); /* pull up the phy io line */ writel(0x1, data->membase + EMAC_MAC_MCMD_REG); /* Wait read complete */ timeout_jiffies = jiffies + MDIO_TIMEOUT; while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { if (time_is_before_jiffies(timeout_jiffies)) return -ETIMEDOUT; msleep(1); } /* push down the phy io line */ writel(0x0, data->membase + EMAC_MAC_MCMD_REG); /* and read data */ value = readl(data->membase + EMAC_MAC_MRDD_REG); return value; } static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) { struct sun4i_mdio_data *data = bus->priv; unsigned long timeout_jiffies; /* issue the phy address and reg */ writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); /* pull up the phy io line */ writel(0x1, data->membase + EMAC_MAC_MCMD_REG); /* Wait read complete */ timeout_jiffies = jiffies + MDIO_TIMEOUT; while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { if (time_is_before_jiffies(timeout_jiffies)) return -ETIMEDOUT; msleep(1); } /* push down the phy io line */ writel(0x0, data->membase + EMAC_MAC_MCMD_REG); /* and write data */ writel(value, data->membase + EMAC_MAC_MWTD_REG); return 0; } static int sun4i_mdio_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct mii_bus *bus; struct sun4i_mdio_data *data; int ret; bus = mdiobus_alloc_size(sizeof(*data)); if (!bus) return -ENOMEM; bus->name = "sun4i_mii_bus"; bus->read = &sun4i_mdio_read; bus->write = &sun4i_mdio_write; snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev)); bus->parent = &pdev->dev; data = bus->priv; data->membase = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(data->membase)) { ret = PTR_ERR(data->membase); goto err_out_free_mdiobus; } data->regulator = devm_regulator_get(&pdev->dev, "phy"); if (IS_ERR(data->regulator)) { if (PTR_ERR(data->regulator) == -EPROBE_DEFER) { ret = -EPROBE_DEFER; goto err_out_free_mdiobus; } dev_info(&pdev->dev, "no regulator found\n"); data->regulator = NULL; } else { ret = regulator_enable(data->regulator); if (ret) goto err_out_free_mdiobus; } ret = of_mdiobus_register(bus, np); if (ret < 0) goto err_out_disable_regulator; platform_set_drvdata(pdev, bus); return 0; err_out_disable_regulator: if (data->regulator) regulator_disable(data->regulator); err_out_free_mdiobus: mdiobus_free(bus); return ret; } static int sun4i_mdio_remove(struct platform_device *pdev) { struct mii_bus *bus = platform_get_drvdata(pdev); struct sun4i_mdio_data *data = bus->priv; mdiobus_unregister(bus); if (data->regulator) regulator_disable(data->regulator); mdiobus_free(bus); return 0; } static const struct of_device_id sun4i_mdio_dt_ids[] = { { .compatible = "allwinner,sun4i-a10-mdio" }, /* Deprecated */ { .compatible = "allwinner,sun4i-mdio" }, { } }; MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids); static struct platform_driver sun4i_mdio_driver = { .probe = sun4i_mdio_probe, .remove = sun4i_mdio_remove, .driver = { .name = "sun4i-mdio", .of_match_table = sun4i_mdio_dt_ids, }, }; module_platform_driver(sun4i_mdio_driver); MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver"); MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); MODULE_LICENSE("GPL v2"); |